CN116276687A - Coated abrasive tool and substrate for processing formaldehyde-free board and preparation method thereof - Google Patents

Abstract

The invention discloses a coated abrasive tool and a base material for processing formaldehyde-free boards and a preparation method thereof. The preparation process of the base material is as follows: the base material is shaped: the setting temperature is 200-250°C, the setting tension is 650-750 N, and the setting The time is 2~4 min; substrate impregnation: the coating amount of impregnating material is 30~100 g/m ² , the viscosity of impregnating material is 100~600 mpa·s, the drying temperature of impregnating material is 160~190℃, and the drying time is 2~ 4 min; Squeegee on the back of the substrate: the coating amount of the back squeegee is 70~150 g/m ² , the viscosity of the back squeegee is 3000~6000 mpa·s, the drying temperature of the back squeegee is 120~180℃, and the drying time is 2 ~4 min; Grinding the front of the substrate: the front of the substrate is sequentially passed through a grinding machine equipped with 240-mesh, 320-mesh, 400-mesh, and 400-mesh abrasive belts for four times of grinding.

Description

Coated abrasive tool and base material for processing formaldehyde-free board and preparation method thereof

technical field

The invention belongs to the field of grinding, and in particular relates to a coated abrasive tool and base material for processing a formaldehyde-free board and a preparation method thereof.

Background technique

Formaldehyde-free wood-based panels: use wood or non-wood plant fiber materials as the main raw materials, process them into various material units, apply formaldehyde-free adhesives or no adhesives, and do not add other additives containing formaldehyde. The wood-based panels required by the index limit are called formaldehyde-free wood-based panels, or formaldehyde-free wood-based panels for short.

Coated abrasives: Refers to abrasives made by adhering abrasives to flexible substrates with a binder, also known as flexible abrasives.

Substrate treatment: treat the coated abrasive substrate to give the substrate a certain degree of stiffness, strength, flatness, and good appearance.

Rubber material: including substrate treatment rubber and coated abrasive manufacturing rubber, substrate processing rubber includes impregnating material, scraping material; coated abrasive manufacturing rubber includes primer, compounding material, and coating material .

Formaldehyde, as the second toxic substance on the preferred control list of toxic chemicals in my country, has attracted more and more attention. Formaldehyde-containing boards will release harmful substances such as formaldehyde during processing and use, endangering people's health. As people become more and more aware of the hazards of indoor formaldehyde, countries all over the world have stricter requirements on formaldehyde release from wood-based panels, and formaldehyde-free panels have also been widely developed and used. However, there is no coated abrasive specially developed for wood materials such as formaldehyde-free boards. In the future, coated abrasives will develop in the direction of specialization, high efficiency, green and low cost.

Patent name: A high-strength antistatic coated abrasive cloth and its treatment process; patent number: CN112677063A.

The above-mentioned patents provide a treatment process for high-strength antistatic coated abrasive cloth. Antistatic agents are added to the impregnation material, front hanging material, and back scraping material to improve the antistatic performance of the cloth base, but it does not mention Antistatic agent ingredients.

Patent name: an antistatic cloth-based coated abrasive tool and its manufacturing method; patent number: CN112720283A.

The above-mentioned patent provides an antistatic cloth base coated abrasive tool. The non-sand-planted surface and the sand-planted surface of the cloth base formed by impregnating the antistatic impregnated rubber on the gray cloth are scraped and coated with the antistatic non-sand-planted surface rubber material and the sand-planted surface respectively. The sand surface rubber material makes a conductive path inside the cloth base, thereby reducing the resistance value of the cloth base.

Patent name: A special abrasive tool for grinding medium and high density plates and its manufacturing method; patent number: CN103862396A.

The above-mentioned patent discloses a special abrasive tool for grinding medium and high density plates. In the coated abrasive tool and its production, zirconium corundum abrasives are introduced to improve the wear resistance and impact resistance during the rough grinding process of medium and high density plates. , to prevent excessive desanding during the grinding process, and can obtain higher grinding efficiency and life than silicon carbide abrasive belts.

Patent name: A high bond strength antistatic adhesive for coating abrasive tools; patent number: CN107236341A.

The above patent provides a high bonding strength antistatic adhesive for coating abrasive tools, which can effectively improve the bonding strength and has good bonding and antistatic properties.

Formaldehyde-free wood-based panels contain a large amount of formaldehyde-free adhesives. The commonly used formaldehyde-free adhesives on the market are mainly polyurethanes, polyethyl acetates, and polyacrylates. Compared with aldehyde-containing adhesives such as phenolic resin and urea-formaldehyde resin, aldehyde-free adhesives have good toughness and low hardness, and are easier to adhere to and clog the surface of the abrasive belt during the plate grinding process, making the abrasive belt invalid. Affect the grinding life of the abrasive belt. At present, for the grinding of formaldehyde-free boards, the traditional abrasive belts for plate grinding are still used. There are problems such as easy clogging of the surface of the abrasive belts, easy flakes of abrasives, and high grinding heat that easily burns the workpiece.

Contents of the invention

The invention provides a coated abrasive tool for processing a formaldehyde-free board, a base material and a preparation method thereof. Through special treatment of the base material, optimal design of primer, re-adhesive, and super-coating formulas, a formaldehyde-free plate processing tool can be prepared. Abrasives are coated to solve the problems that the surface of the abrasive belt is easy to block, the abrasive is easy to fall off in pieces, and the workpiece is easily burned due to high grinding heat during the processing of the existing formaldehyde-free board.

The coated abrasive tool of the present invention is mainly used in constant-thickness grinding and quantitative grinding of wood-based panels, and in particular relates to constant-thickness grinding and quantitative grinding of an aldehyde-free wood-based panel or a non-aldehyde-free wood-based panel product.

The preparation method of the coated abrasive for processing the formaldehyde-free board of the present invention comprises two steps of base material treatment and coated abrasive roll manufacturing.

Wherein, the base material treatment includes: four processes of shaping, dipping, back scraping, and front grinding; the base material is polyester cloth, pure cotton cloth, polyester-cotton blended fabric; the unit weight of the base material is 200~ 600 g/m ² ; the substrate width is 1350~1650mm;

In the setting process, the setting temperature is 200-250°C, the setting tension is 650-750 N, and the setting time is 2-4 minutes; in the impregnation process, the coating amount of the impregnating material is 30-100 g/m ² , and the viscosity of the impregnating material is 100~600 mpa·s, the drying temperature of the impregnating material is 160~190 ℃, and the drying time is 2~4 min; in the back scraping process, the coating amount of the back scraping is 70~150 g/m ² , and the viscosity of the back scraping is 3000~6000 mpa s, the drying temperature of the back scraping material is 120~180 ℃, and the drying time is 2~4 min; in the front side grinding process, the front side of the substrate is sequentially passed through 240 mesh, 320 mesh, 400 mesh, 400 mesh The grinding machine of the mesh belt is used for four grinding, the grinding pressure is 180-220 N, the substrate running speed is 20-30 m/min, and the grinding rod speed is 1000-1500 r/min.

In terms of mass percentage, the composition of the impregnating material is: water-soluble phenolic resin: 10-35%, polyvinyl acetate emulsion: 20-30%, polyvinyl alcohol aqueous solution (concentration: 8-12wt%): 5-15%, butyl Benzene latex: 5~15%, filler: 15~25%, penetrant: 0.5~1%, antistatic agent: 1~3%, thermal conductive material: 1~5%, defoamer: 0.5~1%, dispersion Agent: 1~2%.

The filler is wollastonite; the penetrating agent is fatty alcohol polyoxyethylene ether; the antistatic agent is one of carbon black and graphite or a mixture of two in any proportion; the heat conducting material is nano-alumina , nano-zinc oxide, nano-silicon carbide, fibrous carbon powder, or a mixture of two or more in any proportion; the defoamer is polyether modified silicone oil; the dispersant is polyacrylate copolymer solution.

The preparation process of the impregnating material is as follows: add water-soluble phenolic resin and polyvinyl acetate emulsion into the batching glue pot, stir evenly, then add polyvinyl alcohol aqueous solution, styrene-butadiene latex, penetrating agent, antistatic agent, heat-conducting material, defoaming agent After stirring evenly, add filler, continue stirring for 10-50 minutes, and finally add water to adjust the impregnating material to the process viscosity value.

In terms of weight percentage, the composition of the back scraping material is: water-soluble phenolic resin: 20~35%, styrene-butadiene latex: 10~25%, filler: 30~50%, antistatic agent: 1~3%, thermal conductive material: 1 ~4.5%, defoamer: 0.5~1%, dispersant: 1~2%.

The filler is one or a mixture of two in any proportion of chalk and calcium carbonate; the antistatic agent is one or a mixture of two in any proportion of carbon black and graphite; the heat-conducting material is nano oxide Aluminum, nano-zinc oxide, nano-silicon carbide, fibrous carbon powder, or a mixture of two or more in any proportion; the defoamer is polyether modified silicone oil; the dispersant is polyacrylate copolymer solution ;The preparation process of the back scraping material is: add water-soluble phenolic resin and styrene-butadiene latex into the batching glue pot, after stirring evenly, add antistatic agent, heat-conducting material, defoamer, dispersant, after stirring evenly, add filler, stir 10~50min. Finally, add solvent (usually water) to adjust the viscosity of the back scraping material to the process value.

The substrate prepared by the above preparation method.

The manufacture of large rolls of coated abrasives for the processing of formaldehyde-free boards includes: unwinding of the treated substrate, coating of primer, sand planting, primary drying, coating of adhesive, secondary drying, thermal winding, curing, coating, three times 11 processes of drying and winding;

In the uncoiling process of the treated substrate, the uncoiling speed is 10-50 m/min, and the uncoiling tension is 500-800 N;

In the priming process, the coating amount of the primer is 30-400 g/m ² , the viscosity of the primer is 300-3000 mpa·s, and the coating temperature is 40±2°C;

In the sand planting process, the type of abrasive is silicon carbide, brown corundum, zirconium corundum, and ceramic corundum, or a mixture of two or more in arbitrary proportions, the sand planting density is 80-950 g/m ² , and the abrasive particle size is 16-950 g/m 2 . 800 mesh;

In the primary drying process, the drying temperature is 80-105°C, and the drying time is 30-90 min;

In the process of applying glue, the coating amount of glue is 30-400 g/m ² , the viscosity of the glue is 300-3000 mpa·s, and the glue-coating temperature is 40±2°C;

In the secondary drying process, the drying temperature is 70-115°C, and the drying time is 60-120 min;

In the hot winding process, the hot winding temperature is 110~115°C;

In the curing process, the curing temperature is 110-115°C, and the curing time is 2-6 h;

In the coating process, the coating amount of the super coating material is 200 ~ 700 g/m2, the viscosity of the super coating material is 2000 ~ 6500mpa s, and the coating temperature is room temperature;

In the three drying processes, the drying temperature is 50-115°C, and the drying time is 60-120 min;

In the winding process, the winding temperature is normal temperature.

In terms of mass percentage, the primer composition is: water-soluble phenolic resin: 30~40%, water-soluble polyurethane: 10~15%, filler: 35~55%, penetrant: 0.5~1%, reinforcing agent: 0.5~1.5% %, antistatic agent: 1~3%, thermal conductive material: 1~4%, dispersant: 0.5~2%.

The filler is one of chalk and wollastonite or a mixture of two in any proportion; the penetrating agent is fatty alcohol polyoxyethylene ether; the reinforcing agent is aminopropyltetraethoxysilane; the The antistatic agent is one or a mixture of two in any proportion of carbon black and graphite; the thermally conductive material is one or more of nano-alumina, nano-zinc oxide, nano-silicon carbide, and fibrous carbon powder; The dispersant is polyacrylate copolymer solution.

The primer preparation process is as follows: add water-soluble phenolic resin and water-soluble polyurethane to the batching glue pot, stir evenly, then add penetrating agent, reinforcing agent, antistatic agent, heat-conducting material, dispersant in turn, after stirring evenly, add filler, Stir for 10-50 min, and finally add solvent to adjust the viscosity of the primer to the technological value. The solvent is water.

In terms of mass percentage, the composition of compound glue is: water-soluble phenolic resin: 30~60%, filler: 30~60%, leveling agent: 0.5~1.5%, reinforcing agent: 0.5~1%, antistatic agent: 1~ 3%, thermal conductive material: 1~4%, pigment: 0.5~1%, dispersant: 0.5~2%.

The filler is one of wollastonite, cryolite, potassium fluoroborate, sodium fluoroborate or a mixture of two or more in any proportion; the leveling agent is polydimethylsiloxane, polymethylbenzene One or a mixture of two or more in arbitrary proportions among base siloxane and organo-modified polysiloxane; the reinforcing agent is aminopropyltetraethoxysilane; the antistatic agent is carbon black and graphite One or a mixture of two in any proportion; the thermally conductive material is one or more of nano-alumina, nano-zinc oxide, nano-silicon carbide, and fibrous carbon powder; the pigment is a water-soluble blue pigment Or iron oxide red; The dispersant is a polyacrylate copolymer solution;

The preparation process of compound glue is as follows: add water-soluble phenolic resin into the batching glue pot, stir evenly, then add leveling agent, reinforcing agent, antistatic agent, heat-conducting material, dispersant, after stirring evenly, add filler, stir for 10 ~50 min. Finally, add the pigment and continue stirring for 10-50 min. After the above materials are stirred evenly, add solvent to adjust the viscosity to the technological value. The solvent is water.

In terms of mass percentage, the composition of the super coating material is: epoxy resin: 5~25%, curing agent: 5~25%, active filler: 40~80%, leveling agent: 0.5~1.5%, antistatic agent: 1~3%, pigment: 0.5~1.5%, film former: 0.5~2%, dispersant: 0.5~2%.

The curing agent is diethylenetriamine, triethylenetetramine, ethylenediamine, or a mixture of two or more in any proportion; the active filler is cryolite, zinc stearate, calcium stearate, fluorine Potassium borate, sodium fluoroborate, or a mixture of two or more in any proportion; the leveling agent is polydimethylsiloxane, polymethylphenylsiloxane, organo-modified polysiloxane One or a mixture of two or more in any proportion; the antistatic agent is one or a mixture of two in carbon black and graphite; the pigment is an oil-soluble blue pigment or iron oxide red; Both the film-forming agent and the dispersant are polyacrylate copolymer solutions; the solvent is ethylene glycol ether.

The preparation process of described super coating is:

Prepare component A: Add epoxy resin, active filler, and appropriate amount of solvent into the batching glue pot, stir evenly, then add leveling agent, antistatic agent, film-forming agent, dispersant, and pigment in sequence, and continue stirring for 10~50 min , that is, component A;

Preparation of component B: Add curing agent and appropriate amount of solvent into the batching glue pot, stir for 3 minutes to obtain component B;

Pour components A and B into the batching glue pot, stir evenly, and then add solvent to adjust the viscosity of the coating material to the process value.

Preferably, in the setting process, the setting time is 2 to 3 min;

Preferably, in the impregnation process, the coating amount of the impregnating material is 50-80 g/m ² , the viscosity of the impregnating material is 100-400 mpa·s, the drying temperature of the impregnating material is 170-180 °C, and the drying time is 2-3 min;

Preferably, in the back squeegee process, the coating amount of the back squeegee is 90-130 g/m ² , and the viscosity of the back squeegee is 3000-4000 mPa·s.

The coated abrasive tool for processing the formaldehyde-free board prepared by the above preparation method.

Impregnation material: water-soluble phenolic resin, polyvinyl acetate emulsion, and polyvinyl alcohol together form a rubber system. After curing, the phenolic resin forms a three-dimensional network structure, and the long polymer chains of polyvinyl acetate and polyvinyl alcohol can be combined with the network structure The high-quality phenolic resin forms an interpenetrating network structure, which improves the adhesive force between the rubber material and the substrate and the strength of the film itself, and the mechanical properties of the substrate are good after impregnation and drying; The Si-O bond in the stone filler and the molecular chain of the polymer form a "bridge" structure, which further improves the bonding strength of the rubber compound, and also improves the wear resistance and strength of the substrate; the penetrating agent can improve the impregnation The permeability of the impregnating material makes it easier for the impregnating material to penetrate into the cloth seam and improve the cloth seam filling ability of the impregnating material; the antistatic agent endows the base material with a certain conductivity, which can transfer the charge generated during the grinding process and reduce the electrostatic adsorption of grinding debris phenomenon; thermally conductive materials can transfer grinding heat to the outside of the emery cloth through the base material; defoamers can eliminate or slow down the bubbles caused by easy-to-foam additives such as emulsions; dispersants can evenly disperse fillers, antistatic agents, and thermally conductive materials Inside the substrate, a continuous conductive and heat conduction channel is formed to improve the antistatic and thermal conductivity of the substrate. In addition, the improvement of filler dispersion can also improve the mechanical properties of the substrate.

Back scraping material: water-soluble phenolic resin constitutes the rubber material system. After curing, the film has high stiffness and good heat resistance; styrene-butadiene latex imparts certain toughness and impact resistance to the back of the substrate; filler endows the back of the substrate with certain wear resistance The antistatic agent endows the back of the substrate with a certain degree of electrical conductivity, which can transfer the charge generated during the grinding process and reduce the electrostatic adsorption of grinding debris; the heat-conducting material can The heat is transferred to the outside of the emery cloth through the substrate; the defoamer can eliminate or slow down the bubbles caused by the easy-to-foam additives such as emulsion; the dispersant can make the filler, antistatic agent, and thermal conductive material evenly dispersed in the adhesive layer on the back of the substrate, Form a continuous conduction and heat conduction channel, improve the antistatic and thermal conductivity of the adhesive layer on the back of the substrate, in addition, the improvement of filler dispersion can also improve the mechanical properties of the adhesive layer on the back of the substrate.

Primer: Water-soluble phenolic resin and water-soluble polyurethane form the rubber system. Polyurethane can improve the flexibility and bonding strength of the primer; the filler endows the rubber with certain wear resistance and mechanical properties, and at the same time improves the viscosity of the primer. Bonding strength; penetrating agent can improve the permeability of the primer, so that part of the primer penetrates into the substrate, forming a "nail bond" physically riveted with the substrate inside the substrate, which greatly improves the substrate's hold on the primer Strengthening agent can improve the bonding strength of the rubber to the abrasive; antistatic agent endows the primer layer with a certain conductivity, which can transfer the charge generated during the grinding process and reduce the electrostatic adsorption of grinding debris; The heat is transferred to the outside of the emery cloth; the dispersant can disperse the filler, antistatic agent, and heat-conducting material evenly inside the adhesive layer, forming a continuous conductive and heat-conducting channel, and improving the antistatic and thermal conductivity of the adhesive layer. In addition, the dispersion of the filler Improvement can also improve the mechanical properties of the adhesive layer.

Reglue: Water-soluble phenolic resin constitutes the rubber system. After curing, the film has high stiffness, good impact resistance, and good heat resistance; fillers include inert fillers and active fillers. The inert fillers endow the rubber with certain wear resistance and mechanical properties. At the same time, the adhesive strength of compounding compound can be improved. The active filler absorbs heat and undergoes a phase change during the grinding process, which can reduce the heat in the grinding process of emery cloth, and also has a certain grinding aid effect; the leveling agent can make compounding The rubber is better leveled on the surface of the abrasive; the reinforcing agent can improve the bonding strength of the rubber to the abrasive; the antistatic agent endows the compound layer with a certain conductivity, which can transfer the charge generated during the grinding process and reduce the static electricity of the grinding debris Adsorption phenomenon; thermally conductive materials can transfer grinding heat to the outside of the abrasive cloth; pigments can give the sand surface a certain appearance; dispersants can disperse fillers, antistatic agents, thermally conductive materials, and pigments evenly inside the adhesive layer to form a continuous conductive The thermal conduction channel improves the antistatic and thermal conductivity of the adhesive layer. In addition, the improvement of the filler dispersion can also improve the mechanical properties of the adhesive layer.

Super coating: Epoxy resin and curing agent form a rubber system, which endows the adhesive layer with certain adhesion and film-forming properties; the active filler absorbs heat during the grinding process and undergoes a phase change, which can reduce the heat during the abrasive cloth grinding process At the same time, it also has a certain grinding aid and lubrication effect, which improves the grinding performance and reduces the clogging of the sand surface; the leveling agent can make the super coating material level better on the sand surface; the antistatic agent endows the super coating material with a certain Conductivity, which can transfer the charge generated during the grinding process and reduce the electrostatic adsorption of grinding debris; the pigment can give the sand surface a certain appearance; the film-forming agent can give or improve the film-forming property of the super-coating material; the dispersant can make the active filler , antistatic agent, and pigments are uniformly dispersed inside the adhesive layer to form a continuous conductive and heat conduction channel, which improves the antistatic and thermal conductivity of the adhesive layer. In addition, the improvement of filler dispersion can also improve the mechanical properties of the adhesive layer.

The base material treatment and rubber formula of coated abrasives for formaldehyde-free board processing have an important impact on product performance. Conventional coated abrasive substrate treatment for plate processing usually includes four processes: shaping, dipping, back scraping, and front scraping to ensure that the substrate has high surface smoothness and excellent mechanical properties. The base material treatment of the coated abrasive tool for processing the formaldehyde-free board involved in the present invention includes four processes of shaping, dipping, back scraping, and front grinding treatment, which reduces the front scraping process and allows a small amount of primer to penetrate into the base material Internally, a "nail bond" that is physically riveted with the base material is formed inside the base material, which greatly improves the holding force of the base material to the primer, and avoids the problem of abrasive flakes caused by the peeling off of the primer layer. In addition, in order to ensure that the flatness of the surface of the substrate meets the requirements, a front grinding process of the substrate is added to eliminate the uneven pits on the surface of the substrate and ensure the smoothness of the sand surface of the coated abrasive.

Antistatic agents are added to the dipping slurry, back scraping slurry and primer, compounding and coating materials in the process of substrate processing, and antistatic treatment is carried out to make the abrasive from the front to the back Form a current path, improve its antistatic performance, avoid electrostatic adsorption of abrasive debris on the surface of the abrasive belt, and improve the anti-clogging performance of the abrasive belt. A certain amount of heat-conducting material is added to the dipping slurry, back-scraping slurry, primer material, compounding material, and coating material to form a continuous heat-conducting network from the back to the front of the abrasive cloth, which improves the thermal conductivity of the abrasive cloth and is more conducive to the heat dissipation of the abrasive cloth . The primer formula is toughened and bonded to improve the impact strength and bonding strength of the primer layer, reduce the phenomenon of abrasive flakes caused by the impact of the workpiece, and improve the service life of the abrasive cloth. The formula of the coating material is improved, the type of active filler in the coating material is optimized, and the content of active filler in the coating material is increased to reduce the grinding heat in the abrasive belt grinding process and avoid burning the workpiece.

The invention provides a method for preparing coated abrasives for processing formaldehyde-free boards. Compared with conventional products on the market, the performance of the invented product has been improved by 30%.

Description of drawings

Fig. 1 is the physical picture of the formaldehyde-free wood-based panel after being ground by the abrasive belt of Example 1 of the present invention.

Detailed ways

The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. In the following examples, the solid content of the polyacrylate copolymer solution is 38-42wt%, the viscosity is 25-60 mpa·s, and the pH is 3.3-3.8.

Example 1:

The sizing material formula described in the present embodiment is as follows:

In terms of mass percentage, the composition of the impregnating material is: water-soluble phenolic resin: 20%, polyvinyl acetate emulsion: 30%, polyvinyl alcohol (CAS number: 9002-89-5): 10%, styrene-butadiene latex: 10% , wollastonite: 20%, fatty alcohol polyoxyethylene ether (CAS No.: 111-09-3): 1%, antistatic agent: 3%, nano zinc oxide: 3%, polyether modified silicone oil: 1% , Polyacrylate copolymer solution: 2%.

The water-soluble phenolic resin is a first-stage water-soluble phenolic resin with a viscosity of 1800-2500 mpa·s, a solid content of 75-79wt%, a gel time of 13-16 minutes at 120°C, and a water dilutability of ≥1 at 30°C: 2.5; the polyvinyl acetate emulsion has a solid content of 18-30% and a viscosity of 8000 map·s (25°C); the polyvinyl alcohol is a 10wt% polyvinyl alcohol 1799 solution, and the preparation process is as follows: 10 Add 90 parts of polyvinyl alcohol 1799 particles into 90 parts of water, turn on the agitator, and then start to heat up. After the particles are all melted, stop stirring, and then it can be made into 10% polyvinyl alcohol 1799 solution; the pH of the styrene-butadiene latex is between 6-7, and the active ingredient content is 40 ± 2wt%; the density of the wollastonite is 2.8 g/cm ³ ; the pH of the fatty alcohol polyoxyethylene ether is between 6-7; the antistatic agent is carbon black and graphite, and the mass ratio is 1:1; the particle size of the nano zinc oxide is between 1- between 100 nm.

The preparation process of the impregnating material is as follows: add the water-soluble phenolic resin and polyvinyl acetate emulsion into the batching glue pot, turn on the switch of the stirrer, and stir for 3 min at the speed of the stirrer at 600 r/min. Then add polyvinyl alcohol, styrene-butadiene latex, fatty alcohol polyoxyethylene ether, antistatic agent, nano-zinc oxide, polyether modified silicone oil, and polyacrylate copolymer solution in sequence, adjust the stirrer speed to 800 r/min, and stir The time is 15 minutes. After stirring evenly, wollastonite was added and stirring was continued for 30 min. Finally, add water to adjust the viscosity of the impregnating material to 200 mpa·s.

In terms of weight percentage, the composition of the back scraping material is: water-soluble phenolic resin: 32%, styrene-butadiene latex: 20%, filler: 40%, antistatic agent: 2%, nano-zinc oxide: 3%, polyether modified silicone oil : 1%, polyacrylate copolymer solution: 2%.

The water-soluble phenolic resin is a first-stage water-soluble phenolic resin with a viscosity of 1800-2500 mpa·s, a solid content of 75-79wt%, a gel time of 13-16 minutes at 120°C, and a water dilutability of ≥1 at 30°C: 2.5; the pH of the styrene-butadiene latex is between 6-7, and the active ingredient content is 40±2wt%; the filler is calcium carbonate, wherein, CaCO3≥90%, moisture<1%, and the particle size is: 120 mesh sieve matter ≤ 1%, 230 mesh sieve matter ≤ 5%; the antistatic agent is carbon black and graphite, the mass ratio is 1:1; the particle size of the nano-zinc oxide is between 1-100 nm.

The preparation process of back scraping material is as follows: add water-soluble phenolic resin and styrene-butadiene latex into the batching glue pot, turn on the switch of the stirrer, the speed of the stirrer is 600 r/min, and the stirring time is 3 min. Then add antistatic agent, nano zinc oxide, polyether modified silicone oil, and polyacrylate copolymer solution at one time, and continue stirring for 15 min. After stirring evenly, add calcium carbonate and stir for 30 minutes. Finally, solvent water was added to adjust the viscosity of the back scraping material to 4000 mpa·s.

In terms of weight percentage, the primer composition is: water-soluble phenolic resin: 35%, water-soluble polyurethane: 15%, wollastonite: 40%, fatty alcohol polyoxyethylene ether (CAS number: 111-09-3): 1%, aminopropyltetraethoxysilane: 1%, antistatic agent: 3%, nano zinc oxide: 3%, polyacrylate copolymer solution: 2%.

The water-soluble phenolic resin is a first-stage water-soluble phenolic resin with a viscosity of 600-1200 mpa·s, a solid content of 69-75wt%, a gel time of 7-10 minutes at 120°C, and a water dilutability of ≥1 at 20°C: 0.7; the viscosity of the water-based polyurethane is 800-1400 mpa·s, the solid content is 63-68wt%, and the curing time is 11-15 min/60°C; the pH of the fatty alcohol polyoxyethylene ether is between 6-7; the silicon The density of the limestone is 2.8 g/cm ³ ; the antistatic agent is carbon black and graphite, and the mass ratio is 1:1.

The primer preparation process is as follows: add water-soluble phenolic resin and water-soluble polyurethane to the batching glue pot, turn on the switch of the agitator, the speed of the agitator is 600 r/min, and the stirring time is 3 minutes. Then add fatty alcohol polyoxyethylene ether, aminopropyltetraethoxysilane, antistatic agent, nano zinc oxide, polyacrylate copolymer solution, and continue stirring for 15 min. After stirring evenly, wollastonite was added and stirred for 30 min. Finally, add solvent water to adjust the viscosity of the primer to 1500 mpa s

In terms of percentage by weight, the composition of compound adhesive is: water-soluble phenolic resin: 40%, filler: 50%, polydimethylsiloxane: 1%, aminopropyltetraethoxysilane: 1%, antistatic agent: 3%, nano zinc oxide: 2.5%, iron oxide red: 1%, polyacrylate copolymer solution: 1.5%.

The water-soluble phenolic resin is a first-stage water-soluble phenolic resin with a viscosity of 600-1200 mpa·s, a solid content of 69-75wt%, a gel time of 7-10 minutes at 120°C, and a water dilutability of ≥1 at 20°C: 0.7; the filler is wollastonite, cryolite, potassium fluoroborate, the mass ratio is 1:3:3; the antistatic agent is carbon black and graphite, the mass ratio is 1:1.

The preparation process of compound glue is as follows: add water-soluble phenolic resin into the batching glue pot, turn on the switch of the agitator, the speed of the agitator is 600 r/min, and then add polydimethylsiloxane, aminopropyltetraethoxy Base silane, antistatic agent, nano zinc oxide, polyacrylate copolymer solution, stirred for 15 min. After stirring evenly, add filler and stir for 30 min. Finally, red iron oxide was added and stirring was continued for 30 min. After the above materials are stirred evenly, add solvent water to adjust the viscosity to 1000mpa s

By weight percentage, the supercoating composition is: epoxy resin: 10%, curing agent: 12%, active filler: 70%, polydimethylsiloxane: 1.5%, antistatic agent: 2.5%, iron oxide Red: 1%, film former: 1.5%, dispersant: 1.5%.

The epoxy value of the epoxy resin is: 0.48~0.54; the curing agent is triethylenetetramine; the active filler is composed of cryolite, zinc stearate, and potassium fluoroborate in a mass ratio of 1:2:2 ; The antistatic agent is carbon black and graphite, the mass ratio is 1:1; the film-forming agent and dispersant are both polyacrylate copolymer solutions.

Prepare component A: Add epoxy resin, active filler, and appropriate amount of solvent (ethylene glycol ether, add appropriate amount of solvent for easy stirring) into the batching glue pot, turn on the switch of the agitator, the agitator speed is 600 r/min, and the stirring time is 15 min. Then add leveling agent, antistatic agent, film-forming agent, dispersant, and pigment in sequence, and continue stirring for 30 minutes to obtain component A;

Preparation of component B: Add the curing agent and appropriate amount of solvent (ethylene glycol ether) into the batching glue pot, stir for 3 minutes, and then the component B can be prepared.

The preparation process of the super coating is as follows: pour components A and B into the batching glue pot, turn on the agitator switch, the agitator speed is 600 r/min, and the agitation time is 1 min. Then add the solvent ethylene glycol ether to adjust the viscosity to 4500 mpa s;

This embodiment includes two steps of base material treatment and coated abrasive roll manufacturing:

The base material treatment includes four processes: shaping, dipping, back scraping, and front polishing;

The base material is polyester cloth; the unit weight of the base material is 360 g/m ² ; the width of the base material is 1400 mm;

In the shaping process, the shaping temperature is 220°C, the shaping tension is 700 N, and the shaping time is 3 minutes;

In the impregnation process, the coating amount of the impregnating material is 70 g/m ² , the drying temperature of the impregnating material is 160-190 °C, and the drying time is 3 minutes;

In the back squeegee process, the coating amount of the back squeegee is 130 g/m ² , the drying temperature of the back squeegee is 120-180 °C, and the drying time is 3 minutes;

In the front grinding process, the front of the substrate is sequentially passed through a grinding machine equipped with 240 mesh, 320 mesh, 400 mesh, and 400 mesh abrasive belts, and four grindings are carried out. The grinding pressure is 200 N, and the substrate running speed is 25 m/min. The rotational speed of the grinding rod is 1200 r/min;

The manufacture of large rolls of coated abrasives includes: unwinding of the treated substrate, primer coating, sand planting, primary drying, coating, secondary drying, thermal winding, curing, coating, tertiary drying, and winding 11 process;

In the uncoiling process of the treated substrate, the uncoiling speed is 35 m/min, and the uncoiling tension is 650 N;

In the primer coating process, the primer coating amount is 280 g/m ² , and the glue coating temperature is 40±2°C;

In the sand planting process, the types of abrasives are silicon carbide and zirconium corundum, the mass ratio is 6:1, the sand planting density is 750 g/m ² , and the abrasive particle size is 36 mesh;

In the first drying process, the drying temperature curve is: 85°C-20min, 95°C-20min, 100°C-20min;

In the glue coating process, the amount of glue applied is 300 g/m ² , and the glue coating temperature is 40±2°C;

In the secondary drying process, the drying temperature curve is: 65°C-25min, 80°C-25min, 92°C-25min, 102°C-25min, 110°C-25min;

In the thermal coiling process, the thermal coiling temperature is 113°C;

In the curing process, the curing temperature is 115° C., and the curing time is 3.5 hours;

In the coating process, the amount of supercoat material is 450 g/m ² , and the coating temperature is room temperature;

The drying temperature curves of the three drying processes are: 65°C-25min, 80°C-25min, 92°C-25min, 102°C-25min, 110°C-25min;

In the winding process, the winding temperature is normal temperature.

The large roll of coated abrasive prepared in the example was kneaded and parked to make an abrasive belt with a width*circumference of 1400*4000 mm, installed on a plate grinder, and used for grinding experiments. The grinding object is a formaldehyde-free wood-based panel with a width*length of 1000*2500 mm. The grinding method is constant-thickness grinding, and the rotational speed of the abrasive belt is 15 m/s. The number of ground plates and the surface condition of the plates after grinding are counted. Example 1 A total of 2,618 formaldehyde-free wood-based panels were ground, and there was no burn on the surface of the panels after grinding. See Figure 1 for details of the panels after grinding.

Comparative example 1:

Comparative example 1 adopts the RC851 plate grinding abrasive belt produced by Baige Company, which is commonly used in the market, and the grinding parameters and grinding objects are consistent with Example 1. The number of ground plates and the surface condition of the plate after grinding are counted. .

In Comparative Example 1, a total of 1960 sheets of formaldehyde-free wood-based panels were ground, and there was no burn on the surface of the panels.

Finally, it should be noted that: the above-mentioned embodiments are only used to illustrate the technical solutions for the specific implementation of the present invention and not to limit them. Those of ordinary skill in the art should understand that without violating the purpose of the present invention, its Any equivalent replacement or obvious modification made to the embodiments of the present invention in terms of performance or use shall fall within the scope of protection claimed by the present invention.

Claims (10)

1. The preparation method of the coated abrasive tool base material for processing the aldehyde-free plate is characterized by comprising the following steps of:

(1) Shaping a base material: setting the temperature to be 200-250 ℃, setting the tension to be 650-750N and setting the time to be 2-4 min;

(2) And (3) base material impregnation: the coating amount of the impregnating compound is 30-100 g/m ² The viscosity of the impregnating compound is 100-600 mpa.s, the drying temperature of the impregnating compound is 160-190 ℃ and the drying time is 2-4 min;

(3) Back surface scraping of the substrate: the coating quantity of the back scraping material is 70-150 g/m ² The viscosity of the back scraping material is 3000-6000 mpa.s, the drying temperature of the back scraping material is 120-180 ℃, and the drying time is 2-4 min;

(4) Polishing the front surface of the base material: the front surface of the base material sequentially passes through a grinding machine provided with grinding belts of 240 meshes, 320 meshes, 400 meshes and 400 meshes, four grinding is carried out, the grinding pressure is 180-220N, the running speed of the base material is 20-30 m/min, and the rotating speed of a grinding rod of the grinding machine is 1000-1500 r/min.

2. The method for producing a coated abrasive tool substrate for aldehyde-free plate processing according to claim 1, wherein the substrate is polyester cloth, pure cotton cloth, polyester cotton blend cloth; the single weight of the base material is 200-600 g/m ² The method comprises the steps of carrying out a first treatment on the surface of the The width of the base material is 1350-1650 mm.

3. The method for producing a coated abrasive substrate for aldehyde-free plate processing according to claim 1, wherein the impregnating composition by mass percent is: water-soluble phenolic resin: 10-35% of polyvinyl acetate emulsion: 20-30% of polyvinyl alcohol aqueous solution: 5-15% of styrene-butadiene latex: 5-15% of filler: 15-25% of penetrating agent: 0.5-1%, antistatic agent: 1-3% of a heat conduction material: 1-5% of a defoaming agent: 0.5-1%, dispersant: 1-2%; the filler is wollastonite; the penetrating agent is fatty alcohol polyoxyethylene ether; the antistatic agent is one or a mixture of two of carbon black and graphite in any proportion; the heat conducting material is one or a mixture of more than two of nano aluminum oxide, nano zinc oxide, nano silicon carbide and fibrous carbon powder in any proportion; the defoaming agent is polyether modified silicone oil; the dispersing agent is polyacrylate copolymer solution; the impregnating compound is obtained through the following steps: adding water-soluble phenolic resin and polyvinyl acetate emulsion into a batching glue pot, uniformly stirring, sequentially adding a polyvinyl alcohol aqueous solution, styrene-butadiene latex, a penetrating agent, an antistatic agent, a heat conducting material, a defoaming agent and a dispersing agent, uniformly stirring, adding a filler, continuously stirring for 10-50 min, and adding water to adjust the dipping material to a process viscosity value.

4. The method for preparing a coated abrasive substrate for processing an aldehyde-free plate according to claim 1, wherein the back scraping material comprises the following components in percentage by mass: water-soluble phenolic resin: 20-35% of styrene-butadiene latex: 10-25% of filler: 30-50% of antistatic agent: 1-3% of a heat conduction material: 1-4.5%, defoamer: 0.5-1%, dispersant: 1-2% of filler which is one or a mixture of two of chalk soil and calcium carbonate in any proportion; the antistatic agent is one or a mixture of two of carbon black and graphite in any proportion; the heat conducting material is one or a mixture of more than two of nano aluminum oxide, nano zinc oxide, nano silicon carbide and fibrous carbon powder in any proportion; the defoaming agent is polyether modified silicone oil; the dispersing agent is polyacrylate copolymer solution; the back scraping material is obtained through the following steps: adding water-soluble phenolic resin and styrene-butadiene latex into a batching rubber pot, uniformly stirring, then adding an antistatic agent, a heat conducting material, a defoaming agent and a dispersing agent, uniformly stirring, adding a filler, stirring for 10-50 min, and adding water to adjust the viscosity of the back scraping material to a technological value.

5. A coated abrasive substrate for aldehyde-free plate processing produced by the production method according to any one of claims 1 to 4.

6. A method for preparing a coated abrasive for processing an aldehyde-free plate by using the substrate according to claim 5, which is characterized by comprising the following steps:

(1) Uncoiling the base material at the uncoiling speed of 10-50 m/min and the uncoiling tension of 500-800N;

(2) Coating primer, wherein the coating quantity of the primer is 30-400 g/m ² The viscosity of the primer is 300-3000 mpa.s, and the glue coating temperature is 40+/-2 ℃;

(3) Sand planting, wherein the abrasive material is one or a mixture of more than two of silicon carbide, brown corundum, zirconia corundum and ceramic corundum in any proportion, and the sand planting density is 80-950 g/m ² The granularity of the abrasive is 16-800 meshes;

(4) Primary drying, wherein the drying temperature is 80-105 ℃ and the drying time is 30-90 min;

(5) Coating adhesive, wherein the coating amount of the adhesive is 30-400 g/m ² The compound adhesive is 300-3000 mpa.s, and the adhesive coating temperature is 40+/-2 ℃;

(6) Secondary drying, wherein the drying temperature is 70-115 ℃ and the drying time is 60-120 min;

(7) Hot winding, wherein the hot winding temperature is 110-115 ℃;

(8) Curing, wherein the curing temperature is 110-115 ℃ and the curing time is 2-6 h;

(9) Tu Chao coating, wherein the coating quantity of the super-coating material is 200-700 g/m ² The viscosity of the super-coating material is 2000-6500 mpa.s, and the gluing temperature is room temperature;

(10) Drying for three times, wherein the drying temperature is 50-115 ℃ and the drying time is 60-120 min;

(11) And (5) rolling, wherein the rolling temperature is normal temperature.

7. The method for producing a coated abrasive tool for aldehyde-free plate processing according to claim 6, wherein the primer composition, in mass percent, is: water-soluble phenolic resin: 30-40% of water-soluble polyurethane: 10-15% of filler: 35-55% of penetrating agent: 0.5-1%, reinforcing agent: 0.5-1.5%, antistatic agent: 1-3% of a heat conduction material: 1-4% of a dispersing agent: 0.5-2%; the filler is one or a mixture of two of chalk soil and wollastonite in any proportion; the penetrating agent is fatty alcohol polyoxyethylene ether; the reinforcing agent is aminopropyl tetraethoxy silane; the antistatic agent is one or a mixture of two of carbon black and graphite in any proportion; the heat conducting material is one or a mixture of more than two of nano aluminum oxide, nano zinc oxide, nano silicon carbide and fibrous carbon powder in any proportion; the dispersing agent is polyacrylate copolymer solution, and the primer is obtained through the following steps: adding water-soluble phenolic resin and water-soluble polyurethane into a batching glue pot, stirring uniformly, sequentially adding a penetrating agent, a reinforcing agent, an antistatic agent, a heat conducting material and a dispersing agent, stirring uniformly, adding a filler, stirring for 10-50 min, and adding water to adjust the viscosity of the primer to a process value.

8. The method for preparing the coated abrasive tool for processing the aldehyde-free plate according to claim 6, wherein the compound adhesive comprises the following components in percentage by mass: water-soluble phenolic resin: 30-60% of filler: 30-60% of a leveling agent: 0.5-1.5%, reinforcing agent: 0.5-1%, antistatic agent: 1-3% of a heat conduction material: 1-4% of pigment: 0.5-1%, dispersant: 0.5-2%; the filler is one or a mixture of more than two of wollastonite, cryolite, potassium fluoborate and sodium fluoborate in any proportion; the leveling agent is one or a mixture of more than two of polydimethylsiloxane, polymethylphenylsiloxane and organic modified polysiloxane in any proportion; the reinforcing agent is aminopropyl tetraethoxy silane; the antistatic agent is one or a mixture of two of carbon black and graphite in any proportion; the heat conducting material is one or a mixture of more than two of nano aluminum oxide, nano zinc oxide, nano silicon carbide and fibrous carbon powder in any proportion; the dispersing agent is polyacrylate copolymer solution; the compound is obtained through the following steps: adding water-soluble phenolic resin into a batching glue pot, starting stirring, adding a leveling agent, a reinforcing agent, an antistatic agent, a heat conducting material and a dispersing agent, stirring uniformly, adding a filler, stirring for 10-50 min, adding pigment, stirring continuously for 10-50 min, and adding water to adjust the viscosity to a technological value after the materials are stirred uniformly.

9. The method of producing a coated abrasive for use in the processing of aldehyde-free plates according to claim 6, wherein the super-coating layer comprises, in mass percent: epoxy resin: 5-25% of a curing agent: 5-25% of active filler: 40-80% of a leveling agent: 0.5-1.5%, antistatic agent: 1-3% of pigment: 0.5-1.5%, film forming agent: 0.5-2%, dispersant: 0.5-2%; the curing agent is one or a mixture of more than two of diethylenetriamine, triethylenetetramine and ethylenediamine in any proportion; the active filler is one or a mixture of more than two of cryolite, zinc stearate, calcium stearate, potassium fluoborate and sodium fluoborate in any proportion; the leveling agent is one or a mixture of more than two of polydimethylsiloxane, polymethylphenylsiloxane and organic modified polysiloxane in any proportion; the antistatic agent is one or a mixture of two of carbon black and graphite in any proportion; the film forming agent and the dispersing agent are polyacrylate copolymer solution; the above-mentioned super-coating material is obtained by the following process:

preparing a component A: adding epoxy resin, active filler and a proper amount of solvent into a batching glue pot, stirring uniformly, sequentially adding a leveling agent, an antistatic agent, a film forming agent, a dispersing agent and pigment, and continuing stirring for 10-50 min to obtain a component A;

and (3) preparing a component B: adding the curing agent and a proper amount of solvent into a batching glue pot, and stirring for 3min to obtain a component B;

pouring the component A and the component B into a batching glue pot, uniformly stirring, then adding a solvent, and adjusting the viscosity of the coating to a process value.

10. A coated abrasive for aldehyde-free plate processing produced by the method of any one of claims 6 to 9.

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