Preparation method of environment-friendly hard film water-based antirust agent
Technical Field
The invention relates to the technical field of preparation of antirust agents, in particular to a preparation method of an environment-friendly hard-film water-based antirust agent.
Background
Corrosion of metals occurs throughout the corners of society. The direct economic loss due to metal corrosion in an industrially developed country is reported to account for 4% of the total national economy, and the indirect loss is immeasurable. Therefore, metal corrosion prevention is always a scientific research subject with practical value. The corrosion of the metal product is caused by various factors, mainly oxygen, carbon dioxide, sulfur dioxide, hydrogen sulfide and other gases in the atmosphere are dissolved in a water film on the surface of the metal product to form a corrosion medium. In addition, various oil mists and residues can cause corrosion of the metal product in the atmosphere during processing and use.
In order to avoid or reduce the corrosion of various metal products, various corrosion and rust prevention measures are adopted, such as paint spraying and electroplating of metal devices, black phosphorization and passivation of steel parts, non-metal lining, environment control, use of corrosion and rust inhibitor and the like. During the storage and transportation of workpieces, people often coat butter, or soak oil, or package with rust-proof paper. The method has the advantages of high cost and serious pollution, and the grease is difficult to remove when the workpiece is used and installed, thereby bringing great inconvenience to production. Even, the overall quality and safety of some products will be affected by this. The metal dipping paint process has long antirust period, and trace amount of sand powder is often mixed into the primer in operation, so that the phenomenon of paint sand powder falling off frequently occurs in the processing, assembly and operation of metal products, and the antirust effect is influenced. The phosphating treatment process for the metal products has a good antirust effect, but the required equipment is complex, and the process flow is long.
The metal water-based antirust agent is widely applied due to the advantages of low price, convenient use, easy removal and the like. The water-based antirust agent is prepared by adding a certain amount of antirust agent into aqueous solution, and can form an adsorption protection film on the surface of metal, so that the corrosion process of cathode and anode is retarded. At present, water-based rust preventatives widely used in industry commonly use nitrite and phosphate, wherein nitrite is a carcinogenic substance, and phosphate is discharged into the environment to cause eutrophication. Therefore, the research on the water-based antirust agent without nitrite is of great significance.
Some reports on the research of water-soluble organic water-based antirust agents at home and abroad exist, but the products have more or less defects. For example, SJ-06 water-based film-forming rust inhibitor developed by Tangweizhen and the like utilizes long-chain organic high molecular substances to form a solid protective film to achieve the rust-proof effect, and although nitrite and chromate are not contained, a little white precipitate is separated out after the rust inhibitor is used for a long time. F-124 developed by Royonxiu and the like is an organic composite non-nitrite type water-based antirust agent, is suitable for rust prevention between ferrous metal processes, but has short antirust time. The FY-11 water-based antirust agent developed by Van hongbo and Huyong is a water-based antirust agent prepared by using rosin, maleic anhydride and diethanolamine as main raw materials, and the production process is not easy to control, so that the promotion and application are difficult. In view of the above, it is necessary to design a method for preparing an environment-friendly hard film water-based rust inhibitor.
The environment-friendly water-based hard film antirust agent mainly comprising water-based acrylic emulsion and film forming auxiliary agent is researched. Acrylic acid has better rust resistance and larger contribution to adhesive force under the condition of a dry film, but in a humid environment, water molecules easily enter the interface of a metal coating, and the strong association action of water and carboxyl on the acrylic acid causes the reduction of the acting force of the carboxyl and the surface of steel, the reduction of the wet adhesive force and the reduction of the corrosion resistance. And when no antirust agent is added, the organic coating is only adhered to the carbon steel test piece, and the corrosion resistance is poor. After the additive is added, it can produce a certain chemical reaction with steel test piece to produce a thin phosphated film, and at the same time it can produce P-O-C covalent bond with organic coating material, so that the organic coating material and metal base body can be firmly combined together. And the acrylic acid, the steel and the additive are effectively crosslinked, so that the adhesive force is improved, and the antirust performance is greatly improved.
Disclosure of Invention
The invention aims to provide a preparation method of an environment-friendly hard-film water-based antirust agent, the prepared antirust agent can firmly combine an organic coating and a metal matrix, and meanwhile, acrylic acid, steel and an additive have an effective crosslinking effect, so that the adhesive force of the antirust agent is improved, and the antirust performance of the antirust agent is greatly improved.
In order to realize the aim, the invention provides a preparation method of an environment-friendly hard film water-based antirust agent, which comprises the following steps:
(1) and (3) treatment of the antirust additive: mixing and heating the antirust additive and triethanolamine, and stirring into transparent liquid to obtain the antirust additive;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of antirust additive into the first solution and the second solution, wherein the content of the antirust additive is 1-10%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
Preferably, the antirust additive is one of STAR F50 antirust agent, RN652 phosphate extreme pressure agent, F823 advanced organic phosphoric acid and phytic acid.
Preferably, the rust-proof additive is STAR F50 rust inhibitor, and the preparation method of the environment-friendly hard film water-based rust inhibitor comprises the following steps:
(1) treatment of STAR F50 rust inhibitor: mixing and heating a STAR F50 antirust agent and triethanolamine, and stirring into a transparent liquid to obtain the antirust additive, wherein the addition amount of the STAR F50 antirust agent: triethanolamine 1: 1.2;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of STAR F50 antirust agent into the first solution and the second solution, wherein the content of the STAR F50 antirust agent is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
Preferably, the rust-proof additive is RN652 phosphate extreme pressure agent, and the preparation method of the environment-friendly hard film water-based rust inhibitor comprises the following steps:
(1) treatment of RN652 phosphate extreme pressure agent: mixing and heating RN652 phosphate extreme pressure agent and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount of the RN652 phosphate extreme pressure agent is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of RN652 phosphate extreme pressure agent into the solution I and the solution II, wherein the content of the RN652 phosphate extreme pressure agent is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
Preferably, the antirust additive is F823 high-grade organic phosphoric acid, and the preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) f823 treatment of advanced organic phosphoric acid: mixing and heating F823 high-grade organic phosphoric acid and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount of the F823 high-grade organic phosphoric acid is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: respectively adding a proper amount of F823 high-grade organic phosphoric acid into the first solution and the second solution, wherein the content of the F823 high-grade organic phosphoric acid is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
Preferably, the antirust additive is phytic acid, and the preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) and (3) treatment of phytic acid: mixing and heating phytic acid and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: respectively adding proper amount of phytic acid into the first solution and the second solution, wherein the content of phytic acid is 5-10%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent. Therefore, the antirust agent prepared by the preparation method of the environment-friendly hard-film water-based antirust agent can firmly combine the organic coating and the metal matrix, and meanwhile, acrylic acid, steel and additives have effective crosslinking effect, so that the adhesive force is improved, and the antirust performance is greatly improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for preparing an environment-friendly hard film water-based antirust agent according to the invention;
FIG. 2 is a graph showing the effect of varying amounts of STAR F50 added on etch resistance;
FIG. 3 shows the effect of different addition amounts of RN652 on etch resistance;
FIG. 4 is a graph showing the effect of varying amounts of F823 on corrosion resistance;
FIG. 5 is a graph showing the effect of varying amounts of phytic acid added on corrosion resistance.
Detailed Description
The invention provides a preparation method of an environment-friendly hard film water-based antirust agent, which comprises the following steps:
(1) and (3) treatment of the antirust additive: mixing and heating an antirust additive and triethanolamine, and stirring into a transparent liquid to obtain the antirust additive, wherein the antirust additive is one of STAR F50 antirust agent, RN652 phosphate extreme pressure agent, F823 high-grade organic phosphoric acid and phytic acid;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of antirust additive into the first solution and the second solution, wherein the content of the antirust additive is 1-10%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
And (3) preparing a test piece by using the hard film water-based antirust agent, soaking the steel test piece in 5% of LS-206 alkaline degreasing agent for 10min at room temperature, washing, soaking in the hard film water-based antirust agent for 10min, taking out and drying.
And (3) carrying out a salt water immersion experiment by using the hard film water-based antirust agent, soaking the iron sheet in the hard film water-based antirust agent for 10min, taking out the iron sheet until the film is dried, soaking the iron sheet in 2% of salt water, recording the time for starting rusting, and observing the rusting condition of the iron sheet (the corrosion is based on the occurrence of yellow spots).
Example 1
The rust-proof additive is STAR F50 rust inhibitor, and STAR F50 is a water-based, low-toxicity and efficient ternary organic acid solid metal corrosion inhibitor, can be dissolved in alkali and alcohol amine aqueous solution, and can not be dissolved in oil. Can react with alkali and alcohol amine to prepare various high-performance antirust agents. STAR F50 can be widely used in various aqueous solutions of total synthesis, semisynthesis, cleaning solution and the like, and has excellent antirust performance. STAR F50 shows corrosion inhibition because it contains N, O, S, P polar groups or unsaturated bonds of organic compounds, polar groups and 1/2 bonds of unsaturated bonds can enter the vacant orbital of Fe to form coordination bonds; the nonpolar groups are oleophilic and hydrophobic, and the organic matters are directionally adsorbed on the surface of the iron substrate. Particularly, after secondary chemical action, a protective adsorption film is formed, so that moisture and corrosive substances are prevented from approaching the surface of the steel, and a corrosion inhibition effect is achieved. The preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) treatment of STAR F50 rust inhibitor: mixing and heating a STAR F50 antirust agent and triethanolamine, and stirring into a transparent liquid to obtain the antirust additive, wherein the addition amount of the STAR F50 antirust agent: triethanolamine 1: 1.2;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of STAR F50 antirust agent into the first solution and the second solution, wherein the content of the STAR F50 antirust agent is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
FIG. 2 shows the effect of different amounts of STAR F50 on corrosion resistance, and it can be seen from FIG. 2 that STAR F50 works better in a solution without addition of a film-forming aid, and the optimal amount is 4%, and the soaking time in salt water is 74 min.
Example 2
The antirust additive is RN652 phosphate extreme pressure agent, and RN652 is a water-soluble phosphating additive which has lubricating and extreme pressure functions; is suitable for blending and using in emulsified oil, semi-synthesis and fully-synthesis cooling liquid. RN652 is taken as a functional monomer of phosphate ester, self-polymerization is easy, so that the self-polymerization is mainly controlled by a starvation dropping process during dropping RN 652. The wet adhesion of the coating can be greatly improved by adding RN652, mainly because the phosphate has a certain phosphating effect with a metal base material after adding the phosphate, so that the wet adhesion of the coating is improved. The preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) treatment of RN652 phosphate extreme pressure agent: mixing and heating RN652 phosphate extreme pressure agent and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount of the RN652 phosphate extreme pressure agent is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: and respectively adding a proper amount of RN652 phosphate extreme pressure agent into the solution I and the solution II, wherein the content of the RN652 phosphate extreme pressure agent is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
FIG. 3 shows the effect of different addition amounts of RN652 on etching resistance, and it can be seen from FIG. 3 that RN652 is more effective in a solution without addition of a film-forming assistant, and the optimum amount is 5%, and the salt water soaking time is 101 min.
Example 3
The antirust additive is F823 high-grade organic phosphoric acid, and F823 is a compound of an organic polymer and a special high-molecular compound. Strong alkali resistance, high temperature resistance and salt precipitation resistance, has synergistic detergency and hard water softening capacity, is suitable for a wide pH value range, and can be matched with conventional additives and surfactants to form high-quality antirust agents and cleaning agents. It is suitable for corrosion prevention of most metals such as steel, aluminum, zinc, copper and their alloys, and can also be used as passivation sealing agent for electroplated layers and phosphatized ones. The antirust property is that the working solution with extremely low concentration has better process antirust property than nitrite system, and the metal compound forms an inorganic and organic composite anticorrosive film on the metal surface to seal the gap of the antirust film, so that the antirust property is better. Although the film formed by the F823 high-grade organic phosphoric acid has better atmospheric corrosion resistance, the antirust film has shrinkage phenomenon and uneven film, and is easy to cause edge corrosion. The preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) f823 treatment of advanced organic phosphoric acid: mixing and heating F823 high-grade organic phosphoric acid and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount of the F823 high-grade organic phosphoric acid is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: respectively adding a proper amount of F823 high-grade organic phosphoric acid into the first solution and the second solution, wherein the content of the F823 high-grade organic phosphoric acid is 1-7%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent.
FIG. 4 shows the effect of different amounts of F823 on corrosion resistance, and FIG. 4 shows that F823 is more effective in a solution without addition of a film-forming assistant, and the optimum amount is 2% and the salt water immersion time is 113 min.
Example 4
The anti-rust additive is phytic acid, namely phytic acid hexaphosphate, is a naturally-occurring phosphorus-containing organic compound, mainly exists in plants, is a main component of all plant seeds, and has a molecular formula of (C)6H18O24P6) And the molecular weight is 660.08. The molecular conformation obtained by spectral analysis is a six-carbon ring, has asymmetry, has twelve hydroxyl groups and six phosphate esters on the end group, and has strong chelating capacity. Phytic acid (50%) is a yellowish or brownish, pasty acidic liquid. Is easily soluble in water or hydrous ethanol, and is hardly soluble in organic solvents such as anhydrous ethanol, diethyl ether, benzene, chloroform, etc. The dissociation of the phosphate group can be divided into three segments, and the pK values are 1.83, 6.3, and 9.7, respectively. The aqueous solution is substantially stable at temperatures below 120 ℃. When phytic acid is complexed with metal, a plurality of chelate rings are easily formed, the formed complex has extremely strong stability in a wide pH value range, and when phytic acid is complexed with metal on the surface of the metal, a layer of compact monomolecular organic protective film is easily formed, so that O can be effectively prevented2And the metal surface treated by the phytic acid has stronger bonding performance with the coating because the film layer has similar chemical properties with the organic coating, contains active groups such as hydroxyl, phosphate and the like and can have chemical action with the organic coating. The phytic acid has the characteristics of convenient use, good antirust effect, wide application range, low price and the like, and is a water-soluble antirust product with excellent performance. By utilizing the special performance of the phytic acid, the phytic acid is applied to the processes of metal corrosion prevention, normal-temperature phosphating, chromium-free passivation and the like to obtain very good effects, and a large number of application practices prove that the general popularization and application of the phytic acid in the metal protection treatment can promote the metal protection treatmentThe surface technology is advanced, the environmental pollution is improved, and the method has important economic value. The phytic acid is a cathode corrosion inhibitor, an adsorption layer on the surface of carbon steel inhibits mass transfer of oxygen on an interface, but the usage amount is proper, and excessive phytic acid can accelerate corrosion. Although the phytic acid passivation film is very compact and stable, the phytic acid passivation film has poor adhesion, is easy to fall off from the surface of a plating layer, and has no self-repairing property once being damaged, thereby influencing the protective performance of the passivation film. The preparation method of the environment-friendly hard film water-based antirust agent comprises the following steps:
(1) and (3) treatment of phytic acid: mixing and heating phytic acid and triethanolamine, and stirring into transparent liquid to obtain the antirust additive, wherein the addition amount is as follows: triethanolamine 1: 1.5;
(2) preparing a solution I: adding acrylic resin and a film-forming aid into water, and mixing to obtain a first solution, wherein the film-forming aid is a mixture of dipropylene glycol butyl ether, dibutyl phthalate and sol, and the acrylic resin: dipropylene glycol butyl ether, dibutyl phthalate, sol, water, 75:6:4:14: 100;
(3) preparing a solution II: adding acrylic resin into water to prepare a solution II, wherein the weight ratio of acrylic resin: 1:1 of water;
(4) preparing a hard film water-based antirust agent: respectively adding proper amount of phytic acid into the first solution and the second solution, wherein the content of phytic acid is 5-10%, and respectively obtaining a first hard-film water-based antirust agent and a second hard-film water-based antirust agent. FIG. 5 shows the effect of phytic acid on corrosion resistance, as shown in FIG. 5, phytic acid is more effective in a solution without addition of a film forming aid, the optimal dosage is 7%, and the saline soaking time is 150 min.
Although acrylic acid has a large contribution to the adhesion under the condition of a dry film, water molecules easily enter the interface of the metal coating in a humid environment, and the strong association action of water and carboxyl on the acrylic acid causes the reduction of the acting force of the carboxyl and the surface of steel, the reduction of the wet adhesion and the reduction of the corrosion resistance. And when no antirust agent is added, the organic coating is only adhered to the carbon steel test piece, and the corrosion resistance is poor. After the rust inhibitor is added, it can produce a certain chemical reaction with the carbon steel test piece to produce a thin phosphating film, and at the same time it can produce a P-O-C covalent bond with organic coating, so that the organic coating and metal base body can be firmly combined together. As can be seen from the above figures, most of the figures have a highest point. The reason is that the acrylic resin, the antirust additive and the steel are subjected to effective crosslinking reaction along with the increase of the percentage content of the antirust agent, and when the highest point is reached, the crosslinking degree can be maximized, so that the corrosion resistance reaches the best state. However, when the percentage content is increased, the reaction proceeds in the forward direction, and the degree of crosslinking is rather decreased, resulting in a decrease in corrosion resistance. Experiments show that the antirust agent added with the film forming additive is different from the antirust agent not added with the film forming additive because the film forming additive is added, so that the curing time of the antirust film is only shortened, the chemical reaction of the antirust film is not positively influenced, and the crosslinking action among acrylic acid, the antirust additive and the steel test piece is also influenced, thereby reducing the antirust performance of the antirust film.
Therefore, the antirust agent prepared by the preparation method of the environment-friendly hard-film water-based antirust agent can firmly combine the organic coating and the metal matrix, and meanwhile, acrylic acid, steel and additives have effective crosslinking effect, so that the adhesive force is improved, and the antirust performance is greatly improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.