阅读说明：本技术 一种海洋环境下装备用氟碳涂料及其制备方法 (Fluorocarbon coating for equipment in marine environment and preparation method thereof ) 是由 潘云飞 周如东 赵宝华 朱晓丰 陆文明 李文凯 周丽 于 2019-09-26 设计创作，主要内容包括：本发明属于涂料化工领域,具体涉及一种海洋环境下装备用氟碳涂料及其制备方法。所述氟碳涂料包括组分A和组分B,组分A包括：特种氟碳树脂20～40份、增韧树脂1～4份、钛白粉15～35份、炭黑0.5～1.5份、滑石粉5～10份、晶须1～3份、防沉剂1～3份、分散剂1～5份、催干剂0.1～1份、流平剂0.5～1份、紫外线吸收剂0.5～1份、受阻胺稳定剂0.1～1份、混合溶剂A1 25～35份；组分B包括：脂肪族聚异氰酸酯固化剂55～75份、混合溶剂B1 25～45份。本发明的氟碳涂料具有优异的耐候性和防腐性的同时,提高了涂料的硬度,漆膜强韧,满足装备在C5-M高腐蚀海洋环境条件下的使用要求。(The invention belongs to the field of coating chemical industry, and particularly relates to a fluorocarbon coating for equipment in a marine environment and a preparation method thereof. The fluorocarbon coating comprises a component A and a component B, wherein the component A comprises: 20-40 parts of special fluorocarbon resin, 1-4 parts of toughening resin, 15-35 parts of titanium dioxide, 0.5-1.5 parts of carbon black, 5-10 parts of talcum powder, 1-3 parts of crystal whisker, 1-3 parts of anti-settling agent, 1-5 parts of dispersing agent, 0.1-1 part of drier, 0.5-1 part of flatting agent, 0.5-1 part of ultraviolet absorbent, 0.1-1 part of hindered amine stabilizer and 125-35 parts of mixed solvent A; the component B comprises: 55-75 parts of aliphatic polyisocyanate curing agent and 125-45 parts of mixed solvent B. The fluorocarbon coating provided by the invention has excellent weather resistance and corrosion resistance, improves the hardness of the coating, has a tough paint film, and meets the use requirements of equipment under the high-corrosion marine environment condition of C5-M.)

1. The fluorocarbon coating for equipment in the marine environment is characterized by comprising a component A and a component B in a mass ratio of 10 (1-3), wherein:

the component A comprises the following components in parts by weight: 20-40 parts of special fluorocarbon resin, 1-4 parts of toughening resin, 15-35 parts of titanium dioxide, 0.5-1.5 parts of carbon black, 5-10 parts of talcum powder, 1-3 parts of crystal whisker, 1-3 parts of anti-settling agent, 1-5 parts of dispersing agent, 0.1-1 part of drier, 0.5-1 part of flatting agent, 0.5-1 part of ultraviolet absorbent, 0.1-1 part of hindered amine stabilizer and 125-35 parts of mixed solvent A;

the component B comprises the following components in parts by weight: 55-75 parts of aliphatic polyisocyanate curing agent and 125-45 parts of mixed solvent B.

2. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said special fluorocarbon resin in component A is fluoropropylene vinyl ether fluororesin having a solid hydroxyl value of 90-140 mgKOH/g.

3. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said toughening resin in component A is trimethylolpropane or pentaerythritol modified hydroxyl-terminated fluorosilicone resin, and the number average molecular weight of said toughening resin is 500-1800.

4. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said titanium dioxide in component A is rutile type titanium dioxide, and is one or more of Kemu titanium dioxide R960, R902 and R706; the carbon black is one or more of MA-100 and PRINTEX U; the talcum powder is 800 or 1250 mesh talcum powder.

5. A fluorocarbon coating for equipment in a marine environment as claimed in claim 1, wherein said whiskers in component A are one or more of potassium titanate whiskers, alumina whiskers and silicon carbide whiskers, the average fiber length is 10-30 μm, and the length-diameter ratio is 30-100: 1.

6. A fluorocarbon coating for equipment in marine environment according to claim 1, wherein said anti-settling agent is one or more of organobentonite, polyethylene wax, fumed silica; the dispersant is one or more of BYK-111, EFKA-4310 and AFCONA-4072; the drier is one or more of stannous octoate, organic bismuth and dibutyltin dilaurate.

7. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said leveling agent is one or more of EFKA-3777, BYK-358 and BYK-306; the ultraviolet absorbent is benzotriazole ultraviolet absorbent, and is one or more of TINUVIN384, TINUVIN1130 and TINUVIN 360; the hindered amine stabilizer is sebacate mixture, and is one or more of TINUVIN123 and TINUVIN 292; the mixed solvent A1 is one or more of xylene, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, cyclohexanone and DBE.

8. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said aliphatic polyisocyanate curing agent in component B is one or more of Desmodur N75, Desmodur N3390, E402-90T.

9. A fluorocarbon coating for equipment in marine environment as claimed in claim 1, wherein said mixed solvent B1 in component B is one or more of xylene, butyl acetate, and propylene glycol methyl ether acetate.

10. A method for preparing a fluorocarbon coating for equipment in a marine environment according to claim 1, comprising the steps of:

(1) preparation of component A:

(1-a) adding 20-40 parts of special fluorocarbon resin, 1-4 parts of toughening resin, 1-5 parts of dispersing agent, 0.1-1 part of drier and 0.5-1 part of flatting agent into a feeding container, adding 115-25 parts of partial mixed solvent A, and stirring at the speed of 300-600 revolutions per minute for 10-15 min;

(1-b) adding 15-35 parts of titanium dioxide, 0.5-1.5 parts of carbon black, 5-10 parts of talcum powder, 1-3 parts of whisker and 1-3 parts of anti-settling agent into a feeding container, stirring at the speed of 800-1200 rpm for 20-30 min, uniformly stirring, and grinding until the fineness is less than or equal to 30 mu m;

(1-c) after the fineness is qualified, adding 0.5-1 part of ultraviolet absorbent and 0.1-1 part of hindered amine stabilizer, stirring uniformly, sampling, measuring the non-volatile parts, adjusting the non-volatile parts to 62.5 +/-2 mass percent by using 110-20 parts of residual mixed solvent A, and filtering and packaging by using a 120-mesh filter screen;

(2) preparation of the component B:

putting 55-75 parts of aliphatic polyisocyanate curing agent into a feeding container, adding 125-45 parts of mixed solvent B, uniformly stirring at the speed of 300-600 revolutions per minute, and filtering and packaging by using a 120-mesh filter screen.

Technical Field

The invention belongs to the field of coating chemical industry, and particularly relates to a fluorocarbon coating for equipment in a marine environment and a preparation method thereof.

Background

Compared with the continental climate environment, the marine climate environment has the characteristics of high humidity and heat, high salt mist, strong ultraviolet irradiation, suitability for mold growth and the like, and the annual corrosion rate of the equipment operated in the new climate environment is 3-4 times or even more higher than that of the equipment operated in the land climate environment. Therefore, equipment deployed to these new regions and environments faces extremely harsh use environments, and higher requirements are put on weather resistance and three-proofing performance of the coating. Compared with the conventional acrylic polyurethane coating system, the fluorocarbon coating system has excellent comprehensive performance, especially has incomparable advantages in weather resistance and corrosion resistance, and becomes the first choice of long-acting protective coating. Most of the currently marketed normal-temperature curing fluororesins mainly comprise FEVE (fluorinated olefin monomer (chlorotrifluoroethylene or tetrafluoroethylene) and vinyl monomer (vinyl ether monomer or vinyl ester monomer or mixed monomer thereof)) which is a copolymer, and most of the FEVE fluororesins have lower hydroxyl value, so that the hardness of a coating is soft and the scratch resistance is poor due to insufficient crosslinking density after the fluorocarbon coating is prepared; in order to improve the scratch resistance of the coating, part of fluorocarbon modified acrylic resin or acrylic resin is blended in FEVE fluororesin, but the weather resistance and the corrosion resistance of the coating are reduced to a certain extent, and the coating is easy to crack and peel under the influence of thermal expansion and cold contraction under certain extreme conditions.

Disclosure of Invention

In order to solve the defect that the hardness and weather-resistant and corrosion-resistant properties of fluorocarbon coatings in the prior art are difficult to be considered, the invention provides the fluorocarbon coating which can be cured at normal temperature, is convenient to construct, has a tough paint film and excellent weather resistance and is used for equipment in the marine environment, the coating is suitable for a heavy-duty anticorrosive coating system in the marine environment, has obvious three-prevention effect and can meet the requirements of ISO 12944: the use requirement of C5-M under high corrosion marine environmental conditions.

The technical scheme of the invention is as follows:

a fluorocarbon coating for equipment in a marine environment comprises a component A and a component B in a mass ratio of 10 (1-3), wherein:

the component A comprises the following components in parts by weight: 20-40 parts of special fluorocarbon resin, 1-4 parts of toughening resin, 15-35 parts of titanium dioxide, 0.5-1.5 parts of carbon black, 5-10 parts of talcum powder, 1-3 parts of whisker, 1-3 parts of anti-settling agent, 1-5 parts of dispersing agent, 0.1-1 part of drier, 0.5-1 part of flatting agent, 0.5-1 part of ultraviolet absorbent, 0.1-1 part of hindered amine stabilizer and 125-35 parts of mixed solvent A;

the component B comprises the following components in parts by weight: 55-75 parts of aliphatic polyisocyanate curing agent and 125-45 parts of mixed solvent B.

Preferably, the special fluorocarbon resin in the component A is a fluoropropylene vinyl ether fluorine resin, and the solid hydroxyl value of the special fluorocarbon resin is 90-140 mgKOH/g.

Preferably, the toughening resin in the component A is trimethylolpropane or pentaerythritol modified hydroxyl-terminated fluorosilicone resin, and the number average molecular weight of the toughening resin is 500-1800.

Preferably, the titanium dioxide in the component A is rutile type titanium dioxide, and is one or more of Kemu titanium dioxide R960, R902 and R706; the carbon black is one or more of MA-100 and PRINTEX U; the talcum powder is 800 or 1250 mesh talcum powder.

Preferably, the whisker in the component A is one or more of potassium titanate whisker, alumina whisker and silicon carbide whisker, the average fiber length is 10-30 μm, and the length-diameter ratio is 30-100: 1. The fibrous whisker can improve the wear resistance and toughening effect of the coating and balance the hardness and flexibility of the coating.

Preferably, the anti-settling agent is one or more of organic bentonite, polyethylene wax and fumed silica; the dispersant is one or more of BYK-111, EFKA-4310 and AFCONA-4072; the drier is one or more of stannous octoate, organic bismuth and dibutyl tin dilaurate.

Preferably, the leveling agent is one or more of EFKA-3777, BYK-358 and BYK-306; the ultraviolet absorbent is benzotriazole ultraviolet absorbent, and is one or more of TINUVIN384, TINUVIN1130 and TINUVIN 360; the hindered amine stabilizer is sebacate mixture, and is one or more of TINUVIN123 and TINUVIN 292; the benzotriazole ultraviolet absorber and the sebacate mixture perform synergistic action to further improve the weather resistance of the coating.

The mixed solvent A1 is one or more of xylene, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, cyclohexanone and DBE. The mixed solvent A1 has good solubility to fluorocarbon resin, and the volatilization rate is moderate to form effective gradient, thereby satisfying the coating construction under different environmental conditions.

Preferably, the aliphatic polyisocyanate curing agent in the component B is one or more of Desmodur N75, Desmodur N3390 and E402-90T.

Preferably, the mixed solvent B1 in the component B is one or more of xylene, butyl acetate and propylene glycol monomethyl ether acetate.

The invention also provides a preparation method of the fluorocarbon coating for equipment in the marine environment, which comprises the following steps:

(1) preparation of component A:

(1-a) adding 20-40 parts of special fluorocarbon resin, 1-4 parts of toughening resin, 1-5 parts of dispersing agent, 0.1-1 part of drier and 0.5-1 part of flatting agent into a feeding container, adding 115-25 parts of partial mixed solvent A, and stirring at the speed of 300-600 revolutions per minute for 10-15 min;

(1-b) adding 15-35 parts of titanium dioxide, 0.5-1.5 parts of carbon black, 5-10 parts of talcum powder, 1-3 parts of whisker and 1-3 parts of anti-settling agent into a feeding container, stirring at the speed of 800-1200 rpm for 20-30 min, uniformly stirring, and grinding until the fineness is less than or equal to 30 mu m;

(1-c) after the fineness is qualified, adding 0.5-1 part of ultraviolet absorbent and 0.1-1 part of hindered amine stabilizer, stirring uniformly, sampling, measuring the non-volatile parts, adjusting the non-volatile parts to 62.5 +/-2 mass percent by using 110-20 parts of residual mixed solvent A, and filtering and packaging by using a 120-mesh filter screen;

(2) preparation of the component B:

putting 55-75 parts of aliphatic polyisocyanate curing agent into a feeding container, adding 125-45 parts of mixed solvent B, uniformly stirring at the speed of 300-600 revolutions per minute, and filtering and packaging by using a 120-mesh filter screen.

The invention has the beneficial effects that:

a fluorocarbon coating for equipment with excellent weather resistance and toughness in marine environment takes fluorine propylene vinyl ether fluororesin as a main component, hydroxyl fluorine-silicon resin as toughening resin is blended and spliced into the fluorocarbon coating, and aliphatic polyisocyanate with good weather resistance is taken as a curing agent; wear-resistant and toughened whisker filler is added, and the hardness and flexibility of the coating are balanced by adding fibrous powder; a polymer dispersing auxiliary agent with good miscibility with the fluorocarbon resin system is selected to ensure the grinding effect of the coating and the storage stability of the product; the weather resistance of the coating is further improved by adding the ultraviolet absorber and the hindered amine stabilizer, and the two-component normal-temperature curing high-performance fluorocarbon coating is finally prepared through formula design and optimization. Tests prove that the fluorocarbon coating can be cured at normal temperature, is convenient to construct, has excellent weather resistance and corrosion resistance, improves the hardness of a coating, has a tough paint film, has a remarkable three-proofing effect of a matched heavy-duty anticorrosive coating system, and meets the requirements of equipment in ISO 12944: the use requirement of C5-M under high corrosion marine environmental conditions.

Detailed Description

The present invention will be described in further detail with reference to the following examples, but is not limited thereto.