阅读说明：本技术 一种耐热型环氧防腐涂料及其制备方法 (Heat-resistant epoxy anticorrosive paint and preparation method thereof ) 是由 魏志龙 董翔 贾新乐 许浩鹏 魏浩然 于 2019-08-29 设计创作，主要内容包括：本发明公开了一种耐热型环氧防腐涂料,以环氧树脂和改性聚酰亚胺树脂混合组成防腐涂料树脂基料,环氧树脂和改性聚酰亚胺树脂组成的环氧防腐涂料树脂基料与润湿分散剂、触变剂、消泡剂、颜料、填料以及稀释剂混合组成防腐涂料的甲组分；防腐涂料的乙组分为改性脂环胺固化剂,甲组分和乙组分按照质量比为(3-4):1的比例混合；甲组分中各成分的质量份数为：环氧树脂90-130份、改性聚酰亚胺树脂20-70份、润湿分散剂0.8-2份、触变剂4-7份、消泡剂0.4-1.2份、颜料9-12份、填料80-100份、稀释剂5-20份；乙组分中改性脂环胺固化剂的质量份数为70-100份,将甲组分和乙组分混合均匀得到防腐涂料。该涂料的耐热性和防腐性好,可应用于大型锅炉、高温蒸汽管、烟道、工业排气管道等防腐领域。(The invention discloses a heat-resistant epoxy anticorrosive paint, which is characterized in that epoxy resin and modified polyimide resin are mixed to form an anticorrosive paint resin base material, and the epoxy anticorrosive paint resin base material consisting of the epoxy resin and the modified polyimide resin is mixed with a wetting dispersant, a thixotropic agent, an antifoaming agent, a pigment, a filler and a diluent to form a component A of the anticorrosive paint; the component B of the anticorrosive paint is a modified alicyclic amine curing agent, and the component A and the component B are mixed according to the mass ratio of (3-4) to 1; the component A comprises the following components in parts by weight: 90-130 parts of epoxy resin, 20-70 parts of modified polyimide resin, 0.8-2 parts of wetting dispersant, 4-7 parts of thixotropic agent, 0.4-1.2 parts of defoaming agent, 9-12 parts of pigment, 80-100 parts of filler and 5-20 parts of diluent; and the modified alicyclic amine curing agent in the component B accounts for 70-100 parts by mass, and the component A and the component B are uniformly mixed to obtain the anticorrosive coating. The coating has good heat resistance and corrosion resistance, and can be applied to the corrosion resistance fields of large boilers, high-temperature steam pipes, flues, industrial exhaust pipelines and the like.)

1. a heat-resistant epoxy anticorrosive paint is characterized in that: mixing epoxy resin and modified polyimide resin to form an epoxy anticorrosive coating resin base material, and mixing the epoxy anticorrosive coating resin base material consisting of the epoxy resin and the modified polyimide resin with a wetting dispersant, a thixotropic agent, an antifoaming agent, a pigment, a filler and a diluent to form a component A of the epoxy anticorrosive coating; the component B of the epoxy anticorrosive paint is a modified alicyclic amine curing agent, and the component A and the component B are mixed according to the mass ratio of (3-4) to 1; the component A comprises the following components in parts by weight: 90-130 parts of epoxy resin, 20-70 parts of modified polyimide resin, 0.8-2 parts of wetting dispersant, 4-7 parts of thixotropic agent, 0.4-1.2 parts of defoaming agent, 9-12 parts of pigment, 80-100 parts of filler and 5-20 parts of diluent; the mass portion of the modified alicyclic amine curing agent in the component B is 70-100.

2. A heat-resistant epoxy anticorrosive paint as claimed in claim 1, characterized in that: the epoxy resin is E51 epoxy resin.

3. A heat-resistant epoxy anticorrosive paint as claimed in claim 1, characterized in that: the modified polyimide resin is polythioether benzimidazole imide resin, and the structural formula is as follows:

The preparation method of the polythioether benzimidazole imide resin comprises the following steps:

adding 2.4-6.8g of 4, 4' -bis (4-chlorophthalimide) tetraphenyl sulfide monomer, 0.2-2.3g of biphenyl imidazole monomer and 1.1-3.5g of hydrogenated bisphenol A resin into a reaction vessel, maintaining the reflux temperature of 180 ℃ under the catalytic action of 0.2-5g of potassium carbonate, 10ml-100ml of xylene and 10ml-100ml of sulfolane, carrying out full reaction with water, cooling to room temperature, slowly pouring the reaction liquid into ethanol, filtering, boiling and washing the obtained filter cake, and drying to obtain the polythioether benzimidazole imide resin.

4. A heat-resistant epoxy anticorrosive paint as claimed in claim 1, characterized in that: the wetting dispersant is AT least one of BYK-220s, AT-203, BYK-P104S, BYK-163 and EFKA 4050.

5. a heat-resistant epoxy anticorrosive paint according to claim 1, wherein the thixotropic agent is at least one of fumed silica, polyethylene wax, BYK-7035, and polyamide wax.

6. A heat-resistant epoxy anticorrosive paint as claimed in claim 1, wherein the defoaming agent is at least one of Fomex N, BYK-055 and BYK-066N.

7. A heat-resistant epoxy anticorrosive paint as claimed in claim 1, wherein the pigment is at least one of rutile titanium dioxide, molybdate red, phthalocyanine blue, carbon black and aluminum powder;

The filler is at least one of quartz powder, talcum powder, precipitated barium sulfate and mica powder.

8. A heat resistant epoxy anticorrosive paint as claimed in claim 1, wherein the diluent is at least one of xylene, benzyl alcohol, butyl acetate, propylene glycol methyl ether acetate, N-methylpyrrolidone, N-dimethylacetamide, dimethylsulfoxide, and N-butanol.

9. a heat-resistant epoxy anticorrosive paint as claimed in claim 1, characterized in that: the modified alicyclic amine curing agent is at least one of Cardolite NX2003, Ancamide2726 and ZX-6010.

10. A method for preparing a heat-resistant epoxy anticorrosive paint according to any one of claims 1 to 9, characterized by comprising the steps of:

step one, weighing the components according to the parts by weight of claim 1 for later use;

step two, adding the epoxy resin and the modified polyimide resin weighed in the step one into a dispersion tank, adding the diluent, the wetting dispersant, the thixotropic agent and the defoaming agent weighed in the step one into the dispersion tank, and stirring and dispersing uniformly at the rotation speed of 800-1500r/min to obtain a mixture I;

Step three, under the stirring condition with the rotating speed of 300-;

Step four, subpackaging the modified alicyclic amine curing agent according to the amount weighed in the step one to obtain a component B;

And step five, uniformly mixing the component A obtained in the step three and the component B obtained in the step four to obtain the heat-resistant epoxy anticorrosive paint.

Technical Field

The invention relates to the technical field of anticorrosive coatings, in particular to a heat-resistant epoxy anticorrosive coating and a preparation method thereof.

background

the heat-resistant anticorrosive paint is generally a paint which does not discolor or fall off and can still maintain proper physical and mechanical properties at the temperature of more than 200 ℃. With the use of precision automation and artificial exhaust equipment, flues, furnaces, high temperature steam tubes, etc., heat resistant coatings have developed rapidly. In chemical, petroleum, metallurgy, electric power, machinery and other industries, some equipment and pipelines are corroded due to the existence of corrosive media, and particularly, high-temperature parts of some equipment, such as large-scale boilers, high-temperature steam pipes, flues, heat exchangers and the like, can be quickly corroded under the dual actions of high temperature and corrosive media. Meanwhile, with the enlargement of metal members and the increasing deterioration of the environment, further aggravation of corrosion and difficulty in maintenance are caused. Therefore, the task of corrosion protection of metal high-temperature components is very difficult.

The epoxy anticorrosive paint is one of the most widely and most important heavy anticorrosive paints in the world at present, and has excellent acid resistance, alkali resistance, salt corrosion resistance and atmospheric corrosion resistance. But the conventional epoxy heat-resistant paint can tolerate a low temperature of only about 200 ℃, and the corrosion resistance is obviously reduced under a high-temperature condition. Meanwhile, the further application of the epoxy resin is limited due to the characteristics of high crosslinking density, large internal stress, brittleness, poor heat resistance, high friction coefficient and the like of the cured epoxy resin in the epoxy anticorrosive paint.

therefore, it is inevitable to develop a coating material having good heat resistance and excellent corrosion resistance under high temperature conditions.

disclosure of Invention

In order to solve the defects in the prior art, the invention provides the heat-resistant epoxy anticorrosive paint and the preparation method thereof, wherein the epoxy resin, the modified polyimide resin and the modified alicyclic amine curing agent are used as film forming substances, the paint has the characteristics of excellent high temperature resistance and corrosion resistance, the high temperature resistance of the paint can reach 100h at 400 ℃ and 500 ℃, and the corrosion resistance of the paint under the high temperature condition is greatly improved.

in order to achieve the purpose, the invention adopts the specific scheme that:

A heat-resistant epoxy anticorrosive paint is prepared by mixing epoxy resin and modified polyimide resin to form an epoxy anticorrosive paint resin base material, and mixing the epoxy anticorrosive paint resin base material consisting of the epoxy resin and the modified polyimide resin with a wetting dispersant, a thixotropic agent, an antifoaming agent, a pigment, a filler and a diluent to form a component A of the epoxy anticorrosive paint; the component B of the epoxy anticorrosive paint is a modified alicyclic amine curing agent, and the component A and the component B are mixed according to the mass ratio of (3-4) to 1; the component A comprises the following components in parts by weight: 90-130 parts of epoxy resin, 20-70 parts of modified polyimide resin, 0.8-2 parts of wetting dispersant, 4-7 parts of thixotropic agent, 0.4-1.2 parts of defoaming agent, 9-12 parts of pigment, 80-100 parts of filler and 5-20 parts of diluent; the mass portion of the modified alicyclic amine curing agent in the component B is 70-100.

Preferably, the epoxy resin is E51 epoxy resin.

preferably, the modified polyimide resin is polythioether benzimidazole imide resin, and the structural formula is as follows:

The preparation method of the polythioether benzimidazole imide resin comprises the following steps:

adding 2.4-6.8g of 4, 4' -bis (4-chlorophthalimide) tetraphenyl sulfide monomer, 0.2-2.3g of biphenyl imidazole monomer and 1.1-3.5g of hydrogenated bisphenol A resin into a reaction vessel, maintaining the reflux temperature of 180 ℃ under the catalytic action of 0.2-5g of potassium carbonate, 10ml-100ml of xylene and 10ml-100ml of sulfolane, carrying out full reaction with water, cooling to room temperature, slowly pouring the reaction liquid into ethanol, filtering, boiling and washing the obtained filter cake, and drying to obtain the polythioether benzimidazole imide resin.

Preferably, the wetting and dispersing agent is AT least one of BYK-220s, AT-203, BYK-P104S, BYK-163 and EFKA 4050.

Preferably, the thixotropic agent is at least one of fumed silica, polyethylene wax, BYK-7035 and polyamide wax.

preferably, the defoaming agent is at least one of FomexN, BYK-055 and BYK-066N.

Preferably, the pigment is at least one of rutile titanium dioxide, molybdenum chrome red, phthalocyanine blue, carbon black and aluminum powder;

the filler is at least one of quartz powder, talcum powder, precipitated barium sulfate and mica powder.

Preferably, the diluent is at least one of xylene, benzyl alcohol, butyl acetate, propylene glycol methyl ether acetate, N-methylpyrrolidone, N-dimethylacetamide, dimethyl sulfoxide and N-butanol.

Preferably, the modified alicyclic amine curing agent is at least one of Cardolite NX2003, Ancamide2726 and ZX-6010.

a method for preparing a heat-resistant epoxy anticorrosive paint comprises the following steps:

Step one, weighing the components according to the parts by weight of claim 1 for later use;

Step two, adding the epoxy resin and the modified polyimide resin weighed in the step one into a dispersion tank, adding the diluent, the wetting dispersant, the thixotropic agent and the defoaming agent weighed in the step one into the dispersion tank, and stirring and dispersing uniformly at the rotation speed of 800-1500r/min to obtain a mixture I;

Step three, under the stirring condition with the rotating speed of 300-;

step four, subpackaging the modified alicyclic amine curing agent according to the amount weighed in the step one to obtain a component B;

And step five, uniformly mixing the component A obtained in the step three and the component B obtained in the step four to obtain the heat-resistant epoxy anticorrosive paint.

The wetting dispersant can be adsorbed on the surface of the pigment, so that the interfacial tension between the pigment and the color-spreading agent is reduced, the contact angle is reduced, and the wetting efficiency is improved.

The defoaming agent has the effect that after the defoaming agent is added, the uniformly dispersed defoaming agent can permeate into the foam elastic membrane and be distributed in the foam elastic membrane, so that the adhesive force of the foam elastic membrane is reduced, and the thin layer is easy to break.

The pigment is one of nonvolatile substances in the paint, and has the functions of enabling a formed paint film to have certain color and covering power, increasing the mechanical strength of the paint film, improving the wear resistance, preventing the penetrating power of ultraviolet rays in the paint film so as to delay the aging process of the paint film, improving the weather resistance and prolonging the service life.

The diluent can not dissolve the film-forming substance alone but can dilute the prepared film-forming substance solution, and the film-forming substance is not precipitated.

The modified alicyclic amine curing agent reacts with the synthetic resin in the coating to dry and cure the coating.

Has the advantages that:

1. the invention relates to a heat-resistant epoxy anticorrosive paint prepared by blending modified polyimide resin and epoxy resin liquid and taking a modified alicyclic amine curing agent as a base material. Because the synthesized polyether benzimidazole imide resin contains imidazole rings and imide structures with excellent heat resistance, the heat resistance of the prepared coating is greatly improved; the epoxy resin and the modified alicyclic amine curing agent are subjected to crosslinking reaction, so that the anticorrosive property is excellent; the mixing of the two resins greatly improves the heat resistance of the epoxy anticorrosive paint, the heat resistance (more than 400 ℃) can reach more than 100h, and the corrosion resistance (the salt spray resistance is more than or equal to 2000h) is not affected.

2. The nonvolatile matter content in the coating is more than or equal to 85 percent, the volatile organic matter content is low, the corrosion resistance is excellent, and the coating is environment-friendly and pollution-free.

3. The coating has good mechanical property and chemical corrosion resistance, and can be applied to the anticorrosion fields of large boilers, high-temperature steam pipes, flues, industrial exhaust pipelines and the like.

Detailed Description

the technical solutions in the embodiments of the present invention will be clearly and completely described below.

In the following examples, various starting materials were used, and unless otherwise specified, conventional commercially available products were used. The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

A heat-resistant epoxy anticorrosive paint is prepared by mixing epoxy resin and modified polyimide resin to form an epoxy anticorrosive paint resin base material, and mixing the epoxy anticorrosive paint resin base material consisting of the epoxy resin and the modified polyimide resin with a wetting dispersant, a thixotropic agent, an antifoaming agent, a pigment, a filler and a diluent to form a component A of the epoxy anticorrosive paint; the component B of the epoxy anticorrosive paint is a modified alicyclic amine curing agent, and the component A and the component B are mixed according to the mass ratio of (3.5-5) to 1; the component A comprises the following components in parts by weight: 90-130 parts of epoxy resin, 20-70 parts of modified polyimide resin, 0.8-2 parts of wetting dispersant, 4-7 parts of thixotropic agent, 0.4-1.2 parts of defoaming agent, 9-12 parts of pigment, 80-100 parts of filler and 5-20 parts of diluent; the mass portion of the modified alicyclic amine curing agent in the component B is 70-100.

The component A comprises modified polyimide resin, wherein the modified polyimide resin is polythioether benzimidazole imide resin, and the structural formula of the modified polyimide resin is as follows:

The preparation method of the polythioether benzimidazole imide resin comprises the following steps:

Adding 2.4-6.8g of 4, 4' -bis (4-chlorophthalimide) tetraphenyl thioether monomer, 0.2-2.3g of biphenyl imidazole monomer and 1.1-3.5g of hydrogenated bisphenol A resin into a reaction container, maintaining 180 ℃ of reflux and carrying out water-carrying reaction under the catalytic action of 0.2-5g of potassium carbonate, 10-100 ml of dimethylbenzene and 10-100 ml of sulfolane under the nitrogen atmosphere, cooling to room temperature, slowly pouring the reaction liquid into ethanol, filtering, boiling and washing the obtained filter cake, and drying to obtain the polythioether benzimidazole imide resin.

one example of the preparation of polythioether benzimidazole imide resins: 4.96g of 4, 4' -bis (4-chlorophthalimide) tetraphenyl sulfide monomer, 1.17g of biphenyl imidazole monomer, 1.34g of hydrogenated bisphenol A resin, 1.41g of potassium carbonate, 40ml of xylene and 40ml of sulfolane are added into a dry and clean 250ml three-necked flask, the mixture is refluxed with water at 180 ℃ for 12 hours under a nitrogen atmosphere, then cooled to room temperature, the reaction solution is slowly poured into 500ml of ethanol, filtered, the obtained filter cake is boiled and washed with ethanol for 5 times, and then the mixture is placed in an oven at 120 ℃ for drying for 8 hours to obtain 6.97g of polythioether benzimidazole imide resin powder with the yield of 90%.

Another example of the preparation of polythioether benzimidazole imide resins: a dry clean 250ml three-necked flask was charged with 3.47g of 4, 4' -bis (4-chlorophthalimide) tetraphenyl sulfide monomer, 0.89g of biphenylimidazole monomer, 1.02g of hydrogenated bisphenol A resin, 1.17g of potassium carbonate, 80ml of xylene, and 60ml of sulfolane, and subjected to reflux reaction with water at 180 ℃ for 12 hours under a nitrogen atmosphere, followed by cooling to room temperature, slowly pouring the reaction solution into 500ml of ethanol, filtering, washing the resulting filter cake with ethanol 5 times, and drying in an oven at 120 ℃ for 8 hours to obtain 5.67g of polythioether benzimidazolimide resin powder with a yield of 88%.

A method for preparing a heat-resistant epoxy anticorrosive paint comprises the following steps:

step one, weighing the components according to the mass parts for later use;

Adding the epoxy resin and the modified polyimide resin weighed in the step one into a dispersion tank, adding the diluent, the wetting dispersant, the thixotropic agent and the defoaming agent weighed in the step one into the dispersion tank, and stirring and dispersing uniformly at the rotating speed of 800-1500r/min to obtain a mixture I;

step three, under the stirring condition with the rotating speed of 300-500r/min, sequentially adding the pigment, the filler and the diluent which are weighed in the step one into the mixture I prepared in the step two, stirring and dispersing uniformly under the rotating speed of 800-1100r/min, and grinding until the fineness is less than or equal to 80 microns to obtain a component A;

step four, subpackaging the modified alicyclic amine curing agent according to the amount weighed in the step one to obtain a component B;

And step five, uniformly mixing the component A obtained in the step three and the component B obtained in the step four to obtain the heat-resistant epoxy anticorrosive paint.