阅读说明：本技术 一种耐盐雾水性防锈漆及其制备方法 (Salt-fog-resistant water-based antirust paint and preparation method thereof ) 是由 刘德远 程秋苹 张雪芹 于 2020-07-09 设计创作，主要内容包括：本发明公开一种耐盐雾水性防锈漆,防锈漆按重量份计包括以下组分：丙烯酸树脂50-60份；去离子水5-10份；分散剂1.0-1.5份；消泡剂：0.25-0.4份；pH调节剂0.5-0.7份；复配成膜助剂5-6份；润湿剂0.2-0.3份；防闪锈助剂0.7-0.9份；增稠剂0.5-0.6份；钛白粉4-5份；炭黑0.15-0.2份；沉淀硫酸钡6-10份；磷酸锌4-6份；合成防锈颜料1-1.5份；一种耐盐雾水性防锈漆的制备方法,制备方法包括以下步骤：第一混合物料制成、第二混合物料制成、第三混合物料和防锈漆制成。本发明防锈漆中的合成防锈颜料耐高温,耐光性4-5级,可用于着色；具有优异的耐盐雾性、防锈能力、附着力和较高的硬度,工艺简单,操作方便,绿色环保,安全可靠。(The invention discloses salt spray resistant water-based antirust paint which comprises the following components in parts by weight: 50-60 parts of acrylic resin; 5-10 parts of deionized water; 1.0-1.5 parts of a dispersant; defoaming agent: 0.25-0.4 part; 0.5-0.7 part of pH regulator; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; 0.5-0.6 part of thickening agent; 4-5 parts of titanium dioxide; 0.15-0.2 part of carbon black; 6-10 parts of precipitated barium sulfate; 4-6 parts of zinc phosphate; 1-1.5 parts of synthetic antirust pigment; a preparation method of salt spray resistant water-based antirust paint comprises the following steps: the antirust paint is prepared from a first mixed material, a second mixed material, a third mixed material and antirust paint. The synthetic anti-rust pigment in the anti-rust paint disclosed by the invention is high-temperature resistant and light-resistant at 4-5 levels, and can be used for coloring; the paint has excellent salt spray resistance, antirust capacity, adhesive force, higher hardness, simple process, convenient operation, environmental protection, safety and reliability.)

1. The salt spray resistant water-based antirust paint is characterized by comprising the following components in parts by weight: 50-60 parts of acrylic resin; 5-10 parts of deionized water; 1.0-1.5 parts of a dispersant; defoaming agent: 0.25-0.4 part; 0.5-0.7 part of pH regulator; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; 0.5-0.6 part of thickening agent; 4-5 parts of titanium dioxide; 0.15-0.2 part of carbon black; 6-10 parts of precipitated barium sulfate; 4-6 parts of zinc phosphate; 1-1.5 parts of synthetic antirust pigment;

weighing part of nitric acid A solid, adding deionized water, slowly adding concentrated nitric acid under stirring, heating and boiling for several minutes, filtering, adding a small amount of concentrated sulfuric acid into filtrate, boiling, removing precipitate, adding a small amount of ammonia water to adjust the pH value of the solution to 7.0, adding an ammonium oxalate solution, boiling again, introducing hydrogen sulfide to saturate, slightly heating and boiling, standing for several hours, filtering to remove precipitate, removing impurities by a fractional precipitation method, adjusting the pH value of the solution to 2-3 by using nitric acid, heating and concentrating, and dropwise adding distilled nitric acid into a fully concentrated cold solution to promote crystallization to obtain nitric acid A with high yield;

adding the hot solution of the nitric acid A with high yield into the boiling sodium B solution (slightly excessive), reacting for 2-3h at 80-90 ℃, precipitating, filtering, washing, drying and crushing to obtain the synthesized anti-rust pigment AB, wherein the synthesis principle is as follows: a (NO)₃)₂+Na₂B＝AB↓+2NaNO₃。

2. The salt spray resistant water-based antirust paint of claim 1, wherein the titanium dioxide is R-996 type, the carbon black is C311 type, the precipitated barium sulfate is 1250 mesh, and the zinc phosphate is 1250 mesh.

3. The salt spray resistant water-based rust inhibitive paint of claim 1, wherein said acrylic resin is an anionic acrylic emulsion for metal corrosion prevention.

4. The salt spray resistant water-based rust inhibitive paint of claim 1, wherein the dispersant is a high molecular weight block copolymer solution with pigment affinity group, and the pH adjuster is diethylethanolamine.

5. The salt spray resistant water-based antirust paint as claimed in claim 1, wherein the film forming effect of the antirust paint is the combined action of two film forming aids, wherein the two film forming aids are: dpnb, DPM, BCS, ethylene glycol or alcohol ester twelve.

6. The salt spray resistant water-based antirust paint as claimed in claim 1, wherein the main component of the anti-flash rust additive is organic zinc chelate, and the thickener is polyether polyurethane associated type.

7. A preparation method of salt spray resistant water-based antirust paint is characterized by comprising the following steps:

s1: 5-10 parts of deionized water, 1.0-1.5 parts of dispersant and defoaming agent: 0.1-0.2 part of pH regulator and 0.2-0.3 part of pH regulator are added in sequence while stirring to obtain a first mixed material;

s2: adding 4-5 parts of titanium dioxide, 0.15-0.2 part of carbon black, 6-10 parts of precipitated barium sulfate, 4-6 parts of zinc phosphate and 1-1.5 parts of synthetic anti-rust pigment into the first mixed material in sequence, stirring while adding, and grinding to obtain a second mixed material, wherein the grinding fineness is less than or equal to 20 mu m;

s3: 50-60 parts of acrylic resin; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; stirring the residual defoaming agent while adding to obtain a third mixed material;

s4: and mixing the second mixed material and the third mixed material, and adding 0.5-0.6 of a thickening agent to obtain the salt spray resistant water-based antirust paint.

8. The salt spray resistant water-based antirust paint as claimed in claim 6, wherein the stirring speed in step S1 is 500-600r/min, and the stirring time is 10-15 min.

9. The salt spray resistant water-based antirust paint as claimed in claim 6, wherein in step S2, the stirring speed is 500-600r/min, the stirring time is 5-10min, the grinding speed is 2500-3000r/min, and the grinding time is 2-2.5 h.

10. The salt spray resistant water-based antirust paint as claimed in claim 6, wherein the stirring speed in step S3 is 500-600r/min, and the stirring time is 10-15 min.

Technical Field

The invention relates to the field of antirust paint, in particular to salt spray resistant water-based antirust paint and a preparation method thereof.

Background

The antirust paint is a coating capable of protecting metal surface from chemical or electrochemical corrosion of atmosphere, seawater and the like. Currently used rust inhibitive paints are generally oil-based and water-based. The oily anti-rust paint is convenient to use and low in price, but contains toxic substances such as nitrite and chromate, is harmful to operators, and is difficult to remove from the surface of the material, so that the oily anti-rust paint is rarely used. The water-based antirust paint has no pollution, no three wastes, no combustion and no explosion, ensures the physical health of workers and has excellent safety; can be directly used, saves time and labor, is simple, convenient and quick, and has low coating cost by taking water as a diluent. The problems of the water-based antirust paint in the current market are as follows: poor salt spray resistance, insufficient corrosion and rust prevention capability, insufficient paint film hardness, weak adhesive force and the like.

Disclosure of Invention

The invention aims to provide a salt spray resistant water-based antirust paint and a preparation method thereof, wherein the synthesized antirust pigment has high temperature resistance and light resistance of 4-5 grades and can be used for coloring; the antirust paint has excellent salt spray resistance, antirust capacity, adhesive force, higher hardness, simple process, convenient operation, environmental protection, safety and reliability.

The purpose of the invention can be realized by the following technical scheme:

the salt spray resistant water-based antirust paint comprises the following components in parts by weight: 50-60 parts of acrylic resin; 5-10 parts of deionized water; 1.0-1.5 parts of a dispersant; defoaming agent: 0.25-0.4 part; 0.5-0.7 part of pH regulator; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; 0.5-0.6 part of thickening agent; 4-5 parts of titanium dioxide; 0.15-0.2 part of carbon black; 6-10 parts of precipitated barium sulfate; 4-6 parts of zinc phosphate; 1-1.5 parts of synthetic antirust pigment.

Weighing part of nitric acid A solid, adding deionized water, slowly adding concentrated nitric acid under stirring, heating and boiling for several minutes, filtering, adding a small amount of concentrated sulfuric acid into filtrate, boiling, removing precipitate, adding a small amount of ammonia water to adjust the pH value of the solution to 7.0, adding ammonium oxalate solution, boiling again, introducing hydrogen sulfide to saturate, slightly heating and boiling, standing for several hours, filtering to remove precipitate, removing impurities by a fractional precipitation method, adjusting the pH value of the solution to 2-3 by using nitric acid, heating and concentrating, and dropwise adding distilled nitric acid into fully concentrated cold solution to promote crystallization to obtain the nitric acid A with high yield.

Adding the hot solution of the nitric acid A with high yield into the boiling sodium B solution (slightly excessive), reacting for 2-3h at 80-90 ℃, precipitating, filtering, washing, drying and crushing to obtain the synthesized anti-rust pigment AB, wherein the synthesis principle is as follows: a (NO)₃)₂+Na₂B＝AB↓+2NaNO₃。

Further, the titanium dioxide is R-996 type, the carbon black is C311 type, the precipitated barium sulfate is 1250 meshes, and the zinc phosphate is 1250 meshes.

Further, the acrylic resin is an anionic acrylic emulsion for metal corrosion prevention.

Further, the dispersing agent is a high molecular weight block copolymer solution with pigment affinity groups, and the pH regulator is diethylethanolamine.

Further, the film forming effect of the antirust paint is the combined action of two film forming additives, wherein the two film forming additives are as follows: dpnb, DPM, BCS, ethylene glycol or alcohol ester twelve.

Furthermore, the main component of the flash rust prevention auxiliary agent is organic zinc chelate, and the thickening agent is polyether polyurethane association type.

A preparation method of salt spray resistant water-based antirust paint comprises the following steps:

s1: 5-10 parts of deionized water, 1.0-1.5 parts of dispersant and defoaming agent: 0.1-0.2 part of pH regulator and 0.2-0.3 part of pH regulator are added in sequence while stirring to obtain a first mixed material.

S2: and (3) sequentially adding 4-5 parts of titanium dioxide, 0.15-0.2 part of carbon black, 6-10 parts of precipitated barium sulfate, 4-6 parts of zinc phosphate and 1-1.5 parts of synthetic anti-rust pigment into the first mixed material, stirring while adding, and grinding to obtain a second mixed material, wherein the grinding fineness is less than or equal to 20 mu m.

S3: 50-60 parts of acrylic resin; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; and adding and stirring the residual defoaming agent to obtain a third mixed material.

S4: and mixing the second mixed material and the third mixed material, and adding 0.5-0.6 of a thickening agent to obtain the salt spray resistant water-based antirust paint.

Further, the stirring speed in the step S1 is 500-600r/min, and the stirring time is 10-15 min.

Further, in the step S2, the stirring speed is 600r/min, the stirring time is 5-10min, the grinding speed is 3000r/min, and the grinding time is 2-2.5 h.

Further, the stirring speed in the step S3 is 500-600r/min, and the stirring time is 10-15 min.

The invention has the beneficial effects that:

1. the synthetic anti-rust pigment in the anti-rust paint disclosed by the invention is high-temperature resistant and light-resistant at 4-5 levels, and can be used for coloring;

2. the antirust paint disclosed by the invention has the advantages of excellent salt spray resistance, antirust capability, adhesive force, higher hardness, simple process, convenience in operation, greenness, environmental friendliness, safety and reliability.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 shows the chemical formula of the synthetic anti-rust pigment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The salt spray resistant water-based antirust paint comprises the following components in parts by weight: 50-60 parts of acrylic resin; 5-10 parts of deionized water; 1.0-1.5 parts of a dispersant; defoaming agent: 0.25-0.4 part; 0.5-0.7 part of pH regulator; 5-6 parts of a compound film-forming assistant; 0.2-0.3 part of wetting agent; 0.7-0.9 part of flash rust prevention auxiliary agent; 0.5-0.6 part of thickening agent; 4-5 parts of titanium dioxide; 0.15-0.2 part of carbon black; 6-10 parts of precipitated barium sulfate; 4-6 parts of zinc phosphate; 1-1.5 parts of synthetic antirust pigment.

The titanium dioxide is R-996 type, has stable chemical performance, good whiteness, brightness and glossiness, strong covering power and decoloring power, easy dispersion and excellent weather resistance and chalking resistance.

The carbon black is C311 type, small in particle size, deep in blackness, strong in covering power and tinting strength, heat-resistant, stable to chemicals, soft in quality, easy to grind and easy to disperse.

The precipitated barium sulfate is 1250 meshes, and can improve the light resistance, weather resistance, chemical resistance and electrochemical corrosion resistance of the product.

The zinc phosphate is 1250 meshes and is a white nontoxic antirust pigment. The zinc phosphate group has good activity, can react with a plurality of metal ions to generate a complex, and has good antirust effect.

The synthetic anti-rust pigment is an indispensable anti-rust pigment for salt spray resistance performance test in the preparation of the water-based anti-rust paint. The combined action of the synthetic anti-rust pigment and other anti-rust pigments improves the time of salt spray resistance test and improves the anti-corrosion and anti-rust capacity of the water-based anti-rust paint.

The synthetic anti-rust pigment is prepared by weighing part of the nitric acid A solid, adding deionized water, and slowly adding concentrated nitric acid under stirring. After boiling for several minutes, it was filtered. Adding a small amount of concentrated sulfuric acid into the filtrate, boiling, and removing the precipitate. Adding small amount of ammonia water to adjust pH to 7.0, adding ammonium oxalate solution, boiling again, introducing hydrogen sulfide to saturate, slightly heating to boil, standing for several hours, and filtering to remove precipitate (i.e. removing impurities such as barium, calcium, heavy metals and iron in the solution by fractional precipitation). Then, the pH of the solution was adjusted to 2 to 3 with nitric acid, and the solution was concentrated by heating. Distilled nitric acid is added dropwise into the fully concentrated cold solution to promote crystallization, and nitric acid A with high yield is obtained.

Adding the hot solution of the nitric acid A with high yield into the boiling sodium B solution (slightly excessive), reacting for 2-3h at 80-90 ℃, precipitating, filtering, washing, drying and crushing to obtain the synthesized anti-rust pigment AB, wherein the synthesis principle is as follows: a (NO)₃)₂+Na₂B＝AB↓+2NaNO₃。

The acrylic resin is an anionic acrylic emulsion for metal corrosion prevention, and has good adhesion capability to carbon steel, tinplate, aluminum and other metal substrates. High hardness, good flexibility and excellent corrosion resistance.

The dispersant is a high molecular weight block copolymer solution with pigment affinity group, is a wetting and dispersing assistant for water paint and water pigment concentrated slurry, prevents pigment flocculation, stabilizes the hue and tinting strength of the paint and the pigment slurry, reduces flooding and floating in the pigment mixture, increases the storage stability of the system, improves the wetting and luster of the pigment, and reduces the viscosity of the grinding material. Does not contain any organic solvent, and does not need to grind the resin during grinding.

The defoaming agent in the grinding stage is a defoaming agent suitable for water-based paint, and the chemical components of the defoaming agent are polyether polysiloxane copolymer emulsion containing gas-phase silicon dioxide, so that the defoaming agent is particularly suitable for a water-based system; the defoamer in the paint preparation stage is a mixture of foam breaking polysiloxane and hydrophobic particles in polyethylene glycol, is a standard defoamer for an aqueous emulsion system, and is easy to add.

The pH regulator is diethylethanolamine, and is a high-efficiency amine neutralizer.

The film forming effect of the antirust paint is the combined action of the two film forming additives. Typical film-forming aids that can be selected are: dpnb (dipropylene glycol butyl ether), DPM (dipropylene glycol methyl ether), BCS (ethylene glycol butyl ether), ethylene glycol, alcohol esters, and the like.

The wetting agent is a high-efficiency base material wetting agent, has high performance, excellent anti-shrinkage effect and good recoatability, and additionally promotes the flowing effect.

The main component of the flash rust preventing additive is organic zinc chelate, which can be used as a corrosion inhibitor of water-soluble paint to prevent the formation of 'flash corrosion' and can also be used as a corrosion inhibitor of a can. Is characterized in that: exhibits a strong affinity for ferrous substrates to prevent the occurrence of flash erosion; water-soluble, but can change to water-insoluble or soluble zinc chelates during drying; a decrease in water sensitivity; forming a passivation layer which plays a role of corrosion prevention after the paint film is dried; can be used as corrosion inhibitor in cans; the weather resistance is improved.

The thickening agent is polyether polyurethane associated type, and has high-efficiency thickening performance in a medium-low shear rate range. Low addition amount, high efficiency, excellent anti-sagging and anti-sinking properties and no influence of pH on the action effect. Usually in admixture with small amounts of co-solvent and water.

Anionic acrylic resin is used as a main film forming substance, and the anionic acrylic resin, the titanium dioxide, the precipitated barium sulfate and the carbon black act together to improve the covering power and the weather resistance of a paint film; and the zinc phosphate, the synthetic antirust pigment and the flash rust prevention auxiliary agent are acted together, so that the salt spray resistance and the antirust performance of the paint film are improved. In addition, the components act together to improve the hardness, the adhesive force and the salt spray resistance of the paint film.