CN116516699A - Printing adhesive cement and preparation method and application thereof - Google Patents

Abstract

The invention provides a printing mortar and its preparation method and application, belonging to the technical field of printing. In the present invention, silane coupling agent modified water-based polyurethane is used as film-forming material, and its self-crosslinking property makes the stretchability and elasticity of the prepared coating enhanced, and the introduction of silicon also reduces the surface tension of the coating, so that Water does not infiltrate the surface of the coating, thereby enhancing the water resistance of the coating, and the bridging effect of the silane coupling agent on the coating and the substrate also improves the problem of insufficient adhesion. The invention enhances the structure of the coating by adjusting the type and amount of each component, thereby improving the elasticity, stretching performance and friction resistance. The results of the examples show that the coating prepared by the printing paste of the present application has no peeling off or foaming after being washed 20 times at a temperature of 60° C., the elastic elongation is greater than 150, and the wet rubbing is grade 4, and the coating feels dry and soft.

Description

A kind of printing mucilage and its preparation method and application

technical field

The invention belongs to the technical field of printing, and in particular relates to a printing glue and its preparation method and application.

Background technique

Printing paste is a kind of chemical coating for surface modification and functionalization of textiles. It mainly transfers printing coatings to the surface of textiles through screen printing process.

Water-based polyurethane has the characteristics of high film strength, good elasticity, good tensile resilience, and soft hand feeling. It has great development prospects in printing glue. However, water-based polyurethane itself has poor water resistance, insufficient adhesion, and unsatisfactory friction resistance, especially on hydrophobic nylon, polyester, spandex and other fabrics.

At present, the above-mentioned properties of water-based polyurethane are generally improved by adding a cross-linking agent to the printing glue on the market, but there are problems such as troublesome operation, use up within a specified time, and changes in the feel of the printing coating.

Contents of the invention

The object of the present invention is to provide a kind of printing glue and its preparation method and application, in the printing glue of the present invention, no external crosslinking agent is used, and the printing coating prepared by using the printing glue of the present invention has good water resistance and good elasticity , strong adhesion, soft and smooth feel, excellent friction resistance.

The invention provides a printing paste, which comprises the following components in parts by mass:

The solid content of the silane coupling agent-modified water-based polyurethane emulsion is 40-45wt%;

The printing paste does not contain a crosslinking agent.

Preferably, the silane coupling agent modified aqueous polyurethane emulsion includes Dolphin 1052r and/or Dolphin 1486r.

Preferably, the filler includes titanium dioxide and titanate modified calcium carbonate;

The mass ratio of the titanium dioxide to the titanate-modified calcium carbonate is 1:0.2-2.5.

Preferably, the preparation method of the titanate-modified calcium carbonate comprises the following steps: spraying the titanate coupling agent solution on the preheated calcium carbonate to modify it to obtain the titanate-modified calcium carbonate .

Preferably, the thickener includes alkali thickener, polyurethane thickener and PTF thickener.

Preferably, the alkali thickener includes Dow 8W, the polyurethane thickener includes ASE-60, and the PTF thickener includes RheovisAS 1189 and/or Loongrun TS 275.

Preferably, the dispersant includes ammonium acrylate dispersant and sodium acrylate dispersant;

The mass ratio of the ammonium acrylate dispersant to the sodium acrylate dispersant is 0.3-3:1.

Preferably, the polyacrylic acid ammonium salt dispersant includes BASF 4141; the polyacrylic acid sodium salt dispersant includes Nopco 5040.

The present invention also provides a method for preparing the printing glue described in the above scheme, comprising the following steps: sequentially mixing the silane coupling agent-modified water-based polyurethane emulsion with a dispersant and a filler to obtain a dispersion;

The dispersion liquid is sequentially mixed with water, defoamer, emulsified paraffin and thickener to obtain the printing paste.

The present invention also provides the application of the printing glue described in the above scheme or the printing glue prepared by the preparation method described in the above scheme in fabric printing.

The invention provides a kind of printing mortar, which comprises the following components in parts by mass: 40-65 parts of water-based polyurethane emulsion modified by silane coupling agent; 15-50 parts of filler; 0.5-5 parts of thickener; dispersant 1 to 3 parts; 0.5 to 1 part of defoamer; 3 to 5 parts of emulsified paraffin; 5 to 30 parts of water; the solid content of the silane coupling agent modified water-based polyurethane emulsion is 40 to 45 wt %; There is no cross-linking agent in the glue. The present invention adopts silane coupling agent modified water-based polyurethane as a film-forming material, and its self-crosslinking property enhances the stretchability and elasticity of the prepared coating, and the introduction of silicon also reduces the surface tension of the coating, making water It does not infiltrate the surface of the coating, thereby enhancing the water resistance of the coating, and the bridging effect of the silane coupling agent on the coating and the substrate also improves the problem of insufficient adhesion. The invention enhances the structure of the coating by adjusting the types and amounts of the components, thereby improving the elasticity, stretching performance and friction resistance. The results of the examples show that the coating prepared by the printing paste of the present application has no shedding or foaming after being washed 20 times at a temperature of 60° C., the elastic elongation is greater than 150, and the wet rubbing is grade 4, and the coating feels dry and soft.

Further, the present invention selects titanate-modified calcium carbonate, which enhances its compatibility with silane coupling agent-modified waterborne polyurethane and improves the coating performance.

Furthermore, the present invention uses a combination of ammonium acrylate dispersant and sodium acrylate dispersant to balance the dispersion effect of the filler and the water resistance of the coating.

Further, various thickeners of the present invention balance the rheological properties of the printing paste, make the prepared coating have a good shape, and further improve the elasticity, cohesive force, water resistance and friction resistance of the coating .

In addition, the glue paste of the present invention has a good printing effect on nylon cloth, and the printed pattern and various properties meet the requirements. Compared with the solution of adding an external cross-linking agent to enhance and improve the performance of the printing glue, the printing glue of the present invention is simple to operate, does not need to be used up within a specified time, and does not change the feel of the fabric.

Detailed ways

The invention provides a printing paste, which comprises the following components in parts by mass:

The solid content of the silane coupling agent-modified water-based polyurethane emulsion is 40-45wt%;

The printing paste does not contain a crosslinking agent.

In parts by mass, the silane coupling agent modified water-based polyurethane emulsion in the present invention is 40-65 parts, preferably 45-50 parts.

In the present invention, the solid content of the silane coupling agent-modified aqueous polyurethane emulsion is 45-50 wt%, preferably 48-50 wt%. In the present invention, the silane coupling agent modified aqueous polyurethane emulsion preferably includes Dolphin 1052r and/or Dolph1486r. In the present invention, silane coupling agent is used to modify water-based polyurethane as film-forming material, and its self-crosslinking property can enhance the stretchability and elasticity of the coating, and the introduction of silicon also reduces the surface tension of the coating, making it impossible for water to infiltrate To the surface of the coating, thereby enhancing the water resistance of the coating, the bridging effect of the silane coupling agent on the coating and the substrate also improves the problem of insufficient adhesion.

Based on the mass fraction of the silane coupling agent-modified water-based polyurethane emulsion, the printing paste of the present invention includes 15-50 parts of filler, preferably 20-40 parts, more preferably 30-35 parts. In the present invention, the filler includes titanium dioxide and titanate-modified calcium carbonate, and the mass ratio of the titanium dioxide and titanate-modified calcium carbonate is preferably 1:0.2 to 2.5, more preferably 1:0.5 to 2, more preferably 1:1-1.5. In the present invention, the titanium dioxide is preferably rutile titanium dioxide, and the titanium dioxide preferably includes Anastar 312. In the present invention, the particle size of the titanate-modified calcium carbonate is preferably 1000-1500 mesh. The present invention uses titanate modified calcium carbonate to enhance its compatibility with silane coupling agent modified waterborne polyurethane and improve the coating performance

In the present invention, the preparation method of the titanate-modified calcium carbonate preferably includes the following steps: spraying the titanate coupling agent solution onto the preheated calcium carbonate for modification to obtain the titanate-modified calcium carbonate Calcium Carbonate. In the present invention, the mass ratio of the titanate coupling agent solution to calcium carbonate is preferably 1.6:100. In the present invention, the temperature of the preheating is preferably 80° C., and the time is preferably 5-10 minutes. In the present invention, the mass concentration of the titanate coupling agent solution is preferably 50%. In the present invention, the titanate coupling agent solution is preferably obtained by dissolving titanate in water. In the present invention, the number of times of spraying is preferably 3 times, the time of each spraying is preferably 5 minutes, and the interval between spraying is preferably 2 minutes. In the present invention, the modification time is preferably 5 minutes. The modification is preferably carried out under stirring at a rotation speed of 30-50 rpm. In the present invention, the modification is preferably performed in a high-speed mixer.

Based on the mass fraction of the silane coupling agent-modified water-based polyurethane emulsion, the printing paste of the present invention includes 0.5-5 parts of thickener, preferably 1-4 parts, more preferably 2-3 parts. In the present invention, the thickener preferably includes alkali thickener, polyurethane thickener and PTF thickener. In the present invention, the alkali thickener preferably includes Dow 8W, the polyurethane thickener preferably includes ASE-60, and the PTF thickener preferably includes RheovisAS 1189 and/or Loongrun TS275. Various thickeners in the invention balance the rheological properties of the printing glue, make the prepared coating have good shape, and further improve the elasticity, cohesive force, water resistance and friction resistance of the coating.

Based on the mass parts of the silane coupling agent-modified water-based polyurethane emulsion, the printing paste of the present invention includes 1-3 parts of dispersant, preferably 1.5-2.5 parts. In the present invention, the dispersant preferably includes ammonium acrylate dispersant and sodium acrylate dispersant. In the present invention, the mass ratio of the ammonium acrylate dispersant to the sodium acrylate dispersant is preferably 0.3-3:1, more preferably 0.5-2:1, even more preferably 1-1.5:1. In the present invention, the polyacrylic acid ammonium salt dispersant preferably includes BASF 4141; the polyacrylic acid sodium salt dispersant preferably includes Nopco 5040. The present invention selects the combination of acrylate ammonium salt dispersant and acrylate sodium salt dispersant to balance the dispersion effect of the filler and the water resistance of the coating.

Based on the mass fraction of the silane coupling agent-modified water-based polyurethane emulsion, the printing paste of the present invention includes 0.5-1 part of a defoamer, preferably 0.6-0.8 part. In the present invention, the defoamer preferably includes a mineral oil defoamer or a silicone-based defoamer, the mineral oil defoamer preferably includes Blackburn 245, and the silicone-based defoamer preferably includes BYK- 028.

Based on the mass parts of the silane coupling agent-modified water-based polyurethane emulsion, the printing paste of the present invention includes 3-5 parts of emulsified paraffin wax, preferably 4-4.5 parts. Emulsified paraffin can play the role of anti-adhesion and increase flexibility.

Based on the mass parts of the silane coupling agent-modified water-based polyurethane emulsion, the printing glue in the present invention includes 5-30 parts of water, preferably 10-25 parts, more preferably 15-20 parts. In the present invention, the water is preferably deionized water.

In the present invention, the viscosity of the printing paste is preferably 100,000-140,000 mpas, more preferably 110,000-120,000 mpas.

The present invention also provides a preparation method of the printing glue, comprising the following steps: mixing the silane coupling agent modified water-based polyurethane emulsion with the dispersant and filler in sequence to obtain a dispersion;

The dispersion liquid is sequentially mixed with ion water, defoamer, emulsified paraffin and thickener to obtain the printing paste.

The invention mixes the silane coupling agent modified water-based polyurethane emulsion with the dispersant and filler in sequence to obtain a dispersion liquid. In the present invention, the fineness of the powder in the dispersion liquid is preferably less than 40 μm. If the fineness of the powder in the dispersion is greater than 40 μm, the coating will have a rough feel and poor screen printing operability, and the effect of the powder cannot be fully exerted. A dispersion with a powder fineness of less than 40 μm is sufficient. Specifically, in the embodiment of the present invention, the preparation process of the dispersion liquid is: put the silane coupling agent-modified water-based polyurethane emulsion into the dispersion tank, start stirring at a speed of 300-400r/min, and then pour the Add dispersant to the dispersing tank, continue to stir for 5 minutes, and slowly add filler while keeping stirring. After mixing evenly, speed up the stirring speed to 1000-1200r/min, and stir for 10-20 minutes to obtain a dispersion.

After obtaining the dispersion liquid, the present invention mixes the dispersion liquid with ion water, defoamer, emulsified paraffin and thickener in order to obtain the printing glue. In the present invention, there is no special limitation on the sequential mixing of the dispersion liquid, ionized water, defoamer, emulsified wax, and thickener, and it is enough to mix evenly in a manner well known to those skilled in the art. In the present invention, it is preferred to sequentially add water, defoamer, emulsifier, emulsified paraffin and thickener to the dispersion liquid for sequential mixing. During the mixing process, the present invention preferably adds the next substance after stirring evenly.

In the present invention, after the dispersion liquid is sequentially mixed with ionized water, defoamer, emulsified paraffin and thickener, the resulting mixture is preferably filtered. The present invention has no special limitation on the filtration, and the impurity can be removed by means known to those skilled in the art.

The present invention adopts the above-mentioned feeding sequence to facilitate the preparation of finished products.

The present invention also provides the application of the printing glue described in the above scheme or the printing glue prepared by the preparation method described in the above scheme in fabric printing. In the present invention, the material of the fabric preferably includes one of elastic nylon, polyester and cotton.

In order to further illustrate the present invention, the printing paste provided by the present invention and its preparation method are described in detail below in conjunction with the examples, but they should not be construed as limiting the protection scope of the present invention.

Example 1

The components of printing glue are: Dolphin1486r 45 parts, polyacrylic acid ammonium salt dispersant (BASF 4141) 0.9 part, polyacrylic acid sodium salt dispersant (Nopco 5040) 0.3 part, rutile titanium dioxide (Ananda 312) 25 parts, 15 parts of 1500 mesh titanate modified calcium carbonate, 8.7 parts of deionized water, 1 part of mineral oil defoamer (Blackburn 245), 3 parts of emulsified paraffin, 0.3 parts of alkali thickener (Dow 8W), polyurethane thickener Thickener (ASE-60) 0.3 parts and PTF thickener Rheovis 11890.5 parts.

The preparation method of titanate modified calcium carbonate is:

Put 100 parts of 1500-mesh calcium carbonate into a high-speed mixer at a speed of 30 rpm, and preheat at a temperature of 80°C for 5 minutes. 1.6 parts of titanate coupling agent solution with a mass content of 50% were sprayed three times, each spraying time was 5 minutes, and each time interval was 2 minutes. After mixing at high speed for 5 minutes, the titanate-modified calcium carbonate was obtained.

The preparation method of printing glue is:

(1) Weigh the silane coupling agent modified water-based polyurethane emulsion according to the formula and put it into the dispersion kettle, start stirring, and the speed is 400r/min;

(2) Put the two dispersants into the dispersing tank in turn according to the formula quantity, stir for 5 minutes, and stir evenly;

(3) While keeping stirring, slowly add rutile titanium dioxide and titanate modified calcium carbonate into the dispersion kettle, mix evenly, increase the stirring speed to 1100r/min, and stir at high speed for 15 minutes; disperse until the fineness is qualified: Less than 40μm;

(4) Add deionized water and stir evenly;

(5) Add defoamer and stir evenly;

(6) Add emulsified paraffin and stir;

(7) Add the metered thickener and stir;

(8) filter to obtain a consistency of 130000mpas printing glue.

The printing glue obtained in Example 1 is used to print the coating on nylon cloth: screen printing 3 times, three times each time, and then drying at 100° C. for 1 min. Tested for water resistance, elastic elongation, wet rub resistance, hand and anti-tack.

The test method is as follows: 1. Water resistance: wash in the washing machine at a temperature of 60°C, the time of each washing is 1h, wash 20 times, and observe the foaming and falling off;

2. Elastic elongation: The printed cloth plate is cut into 2cm wide and 5cm long cloth strips, and is slowly stretched under constant tension until the coating cracks. Calculate elongation;

3. Wet rub resistance: tested by a rub resistance tester;

4 feel: hand touch;

5. Anti-adhesion: Fold the cloth plate in half, press with a pressure of 5kg for 24 hours, and observe the adhesion and damage of the cloth plate.

The test results are shown in Table 1:

Table 1 The test results of coating water resistance, elastic elongation, wet rub resistance, hand feeling and anti-tackiness

Water-based 60°C Elastic elongation Moisture resistance feel anti-stick 20 times without falling off 200% level 4 dry none

It can be seen from Table 1 that the obtained printing paste has no shedding or foaming after being washed 20 times at 60°C; the elastic elongation is 200; the wet rubbing grade is 4; the hand feels dry and soft. The performance can fully meet the application requirements.

Example 2

The components of the printing paste are: Dolphin1486r 65 parts, polyacrylic acid ammonium salt dispersant (BASF 4141) 0.7 part, polyacrylic acid sodium salt dispersant (Nopco 5040) 0.3 part, rutile titanium dioxide (Ananda 312) 15 parts, 10 parts of titanate-modified calcium carbonate prepared in Example 1 of 1500 meshes, 3.9 parts of deionized water, 1 part of mineral oil defoamer (Blackburn 245), 3 parts of emulsified paraffin, alkali thickener (Dow 8W) 0.3 parts, 0.3 parts of polyurethane thickener (ASE-60) and 0.5 parts of PTF thickener (LoongrunTS275).

The preparation method of printing glue is:

(1) Weigh the silane coupling agent modified water-based polyurethane emulsion according to the formula and put it into the dispersion kettle, start stirring, and the speed is 300r/min;

(2) Put the two dispersants into the dispersing tank in turn according to the formula quantity, stir for 5 minutes, and stir evenly;

(3) While keeping stirring, slowly add rutile titanium dioxide and titanate modified calcium carbonate into the dispersion kettle, mix evenly, increase the stirring speed to 1100r/min, and stir at high speed for 15 minutes; disperse until the fineness is qualified: Less than 40μm;

(4) Add deionized water and stir evenly;

(5) Add defoamer and stir evenly;

(6) Add emulsified paraffin and stir;

(7) Add the metered thickener and stir;

(8) filter to obtain a consistency of 140000mpas printing glue.

The printing paste obtained in Example 2 is printed on nylon cloth: screen printing 3 times, three times each time, and then drying at a temperature of 100 ° C for 1 min, the water resistance, elastic elongation, Wet rub resistance, hand and anti-tack were tested. The test results are shown in Table 2:

Table 2 The test results of coating water resistance, elastic elongation, wet rub resistance, hand feeling and anti-tackiness

Water-based 60°C Elastic elongation Moisture resistance feel anti-stick 20 times without falling off 350% level 4 dry none

It can be seen from Table 2 that there is no shedding or foaming after 20 times of washing at 60°C; the elastic elongation is 350%; wet rubbing is grade 4; the hand feels dry and soft. Can meet the requirements.

Example 3

The components of printing paste are: Dolphin1486r 55 parts, polyacrylic acid ammonium salt dispersant (BASF 4141) 0.7 part, polyacrylic acid sodium salt dispersant (Nopco 5040) 0.3 part, rutile titanium dioxide (Ananda 312) 20 parts, 10 parts of titanate-modified calcium carbonate prepared in Example 1 of 1500 meshes, 9.2 parts of deionized water, 1 part of mineral oil defoamer (Blackburn 245), 3 parts of emulsified paraffin, alkali thickener (Dow 8W) 0.3 parts, 0.2 parts of polyurethane thickener (ASE-60) and 0.5 parts of PTF thickener (LoongrunTS275).

The preparation method of printing glue is:

(1) Weigh the silane coupling agent modified water-based polyurethane emulsion according to the formula and put it into the dispersion kettle, start stirring, and the speed is 300r/min;

(2) Put the two dispersants into the dispersing tank in turn according to the formula quantity, stir for 5 minutes, and stir evenly;

(3) While keeping stirring, slowly add rutile titanium dioxide and titanate modified calcium carbonate into the dispersion kettle, mix evenly, increase the stirring speed to 1100r/min, and stir at high speed for 15 minutes; disperse until the fineness is qualified: Less than 40μm;

(4) Add deionized water and stir evenly;

(5) Add defoamer and stir evenly;

(6) Add emulsified paraffin and stir;

(7) Add the metered thickener and stir;

(8) filter to obtain a consistency of 105000mpas printing glue.

The printing paste obtained in Example 3 is printed on nylon cloth: screen printing 3 times, three times each time, and then drying at a temperature of 100 ° C for 1 min, the water resistance, elastic elongation, Wet rub resistance, hand and anti-tack were tested.

The test results are shown in Table 3:

Table 3 The test results of coating water resistance, elastic elongation, wet rub resistance, hand feeling and anti-tackiness

Wash at 60°C Elastic elongation Moisture resistance feel anti-stick 20 times without falling off 300 level 4 dry none

It can be seen from Table 3 that the obtained printing glue did not fall off or foam after being washed 20 times at 60°C; the elastic elongation rate was 300%; the wet rubbing grade was 4; the hand feeling was dry and soft. The performance can fully meet the application requirements.

Although the foregoing embodiment has described the present invention in detail, it is only a part of the embodiments of the present invention, rather than all embodiments, and other embodiments can also be obtained according to the present embodiment without inventive step, and these embodiments are all Belong to the protection scope of the present invention.

Claims (10)

1. A kind of printing mortar, is characterized in that, by mass parts, comprises following component: The solid content of the silane coupling agent-modified water-based polyurethane emulsion is 40-45wt%; The printing paste does not contain a crosslinking agent. 2. The printing paste according to claim 1, characterized in that, the silane coupling agent modified water-based polyurethane emulsion comprises Dolphin 1052r and/or Dolph1486r. 3. printing mortar according to claim 1, is characterized in that, described filler comprises titanium dioxide and titanate modified calcium carbonate; The mass ratio of the titanium dioxide to the titanate-modified calcium carbonate is 1:0.2-2.5. 4. printing mortar according to claim 3, is characterized in that, the preparation method of described titanate modified calcium carbonate comprises the following steps: titanate coupling agent solution is sprayed on the calcium carbonate after preheating modification to obtain the titanate-modified calcium carbonate. 5. The printing paste according to claim 1, characterized in that, the thickener comprises an alkali thickener, a polyurethane thickener and a PTF thickener. 6. printing mortar according to claim 5, is characterized in that, described alkali thickener comprises Dow 8W, and described polyurethane thickener comprises ASE-60, and described PTF thickener comprises RheovisAS 1189 and/or or Loongrun TS 275. 7. printing mortar according to claim 1, is characterized in that, described dispersant comprises ammonium acrylate dispersant and sodium acrylate dispersant; The mass ratio of the ammonium acrylate dispersant to the sodium acrylate dispersant is 0.3-3:1. 8. The printing glue according to claim 7, characterized in that, the polyacrylic acid ammonium salt dispersant comprises BASF 4141; the polyacrylic acid sodium salt dispersant comprises Nopco 5040. 9. The method for preparing the printing glue according to any one of claims 1 to 8, characterized in that it comprises the following steps: mixing the silane coupling agent-modified water-based polyurethane emulsion with a dispersant and a filler in sequence to obtain a dispersion; The dispersion liquid is sequentially mixed with water, defoamer, emulsified paraffin and thickener to obtain the printing paste. 10. The application of the printing glue according to any one of claims 1 to 8 or the printing glue prepared by the preparation method according to claim 9 in fabric printing.