Preparation method of ultraviolet light-cured coating for seamless steel pipe

A technology for curing coatings and seamless steel pipes, applied in the direction of epoxy resin coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problem of poor brittleness and flexibility of coatings, poor brittleness and flexibility, and difficulty in meeting anti-corrosion requirements and other problems, to achieve the effect of good metal adhesion, excellent mechanical properties, and good elasticity

Active Publication Date: 2012-01-11
杭州华仙涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Before the 1970s, almost all steel pipe anti-corrosion coatings used solvent-based coatings, generally with a solid content of 45-55%, high VOC (volatile organic compound) emissions, long construction time, high energy consumption, and easy to cause coating damage. Defects, difficult to meet anti-corrosion requirements, low production efficiency
[0009] Chinese invention patent CN1294163 discloses a UV-curable metal anti-corrosion decorative paint, which is composed of main resin acrylic epoxy resin, diluent, photoinitiator and auxiliary agent. After mixing and stirring uniformly according to a certain weight percentage, the obtained , but this type of coating has the disadvantages of brittleness, poor flexibility and high viscosity
[0010] Chinese invention patent CN101260254 discloses a UV-curable steel anticorrosion paint, which is composed of: bisphenol A epoxy acrylate 10-50wt%, macromolecular acrylic resin 10-20wt%, acrylic acid modified amino resin 5-20wt% %, 1-5wt% of acrylate phosphate, 5-20wt% of hydroxyl-containing acrylate monomer, 5-20wt% of hybrid metal-containing oligomer, 1-5wt% of photoinitiator, 20-20wt% of diluent 60wt%, 0.01-1wt% additives, the UV-curable steel anticorrosion paint is applied to the temporary anticorrosion protection of steel, the amount of the paint thinner is relatively large, and there are also disadvantages such as brittleness, poor flexibility and high viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 5Kg of 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate, 50g of composite catalyst composed of stannous octoate and triethylenediamine were successively added to the reactor, stirring was started, and hydroxyacrylic acid was added dropwise. 5Kg of ethyl ester was added dropwise and reacted at 60° C. for 12 hours to obtain 10Kg of acrylated polyurethane oligomer.

[0032] In the reactor, 25Kg of 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate, 450g of composite catalyst composed of stannous octoate and triethylenediamine were successively added, stirring was started, and hydroxyacrylic acid was added dropwise. 12Kg of ethyl ester was added dropwise and reacted at 60°C for 4 hours, 53Kg of polytetrahydrofuran ether polyol was added, and after the addition was completed, the reaction was performed at 60°C for 4 hours to obtain a polyol-modified acrylate polyurethane oligomer.

[0033] Add 10Kg of acrylated urethane oligomer and 90Kg of polyol-modified ...

Embodiment 2

[0036] In the reactor, 50g of composite catalyst composed of 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate 5Kg, dibutyltin dilaurate and N,N-dimethylbenzylamine were added successively to start Stir, add 5Kg of hydroxyethyl acrylate dropwise, and react at 60° C. for 12 hours after the dropwise addition to obtain 10Kg of acrylated polyurethane oligomer.

[0037] 25Kg of 3-isocyanatomethylene-3,5,5-trimethylcyclohexyl isocyanate, 450g of composite catalyst composed of dibutyltin dilaurate and N,N-dimethylbenzylamine were successively added to the reactor, and the Stir, add 12Kg of hydroxyethyl acrylate dropwise, react at 60°C for 4 hours after the dropwise addition, add 53Kg of polycaprolactone polyol, and react at 60°C for 4 hours after the addition to obtain polyol modified acrylate polyurethane oligomer.

[0038] Add 10Kg of acrylated urethane oligomer and 70Kg of polyol-modified acrylated urethane oligomer, add 30Kg of bisphenol A epoxy acrylate and 10Kg of organo...

Embodiment 3

[0041] In the reactor, 5.3Kg of polyphenyl polymethylene polyisocyanate, 50g of composite catalyst composed of dibutyltin maleate and N,N-dimethylbenzylamine were successively added, stirring was started, and 4.7Kg of hydroxyethyl acrylate was added dropwise. , 10Kg of acrylated urethane oligomer was obtained by reacting at 60° C. for 12 hours after the dropwise addition.

[0042] In the reactor, 28Kg of polyphenyl polymethylene polyisocyanate, 450g of composite catalyst composed of dibutyltin maleate and N,N-dimethylbenzylamine were successively added, and stirring was started, and 11Kg of hydroxyethyl acrylate was added dropwise. After the addition, the reaction was carried out at 60° C. for 4 hours, 51Kg of polytetrahydrofuran ether polyol was added, and after the addition, the reaction was performed at 60° C. for 4 hours to obtain a polyol-modified acrylate polyurethane oligomer.

[0043] Add 20Kg of acrylated urethane oligomer and 70Kg of polyol-modified acrylated urethan...

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Abstract

The invention discloses a preparation method of an ultraviolet light-cured coating for a seamless steel pipe, which comprises the following steps: adding isocyanate and a catalyst to a reaction vessel, stirring, adding hydroxyethyl acrylate to react for a certain time to obtain an acrylic polyurethane oligomer; adding isocyanate and a catalyst to a reaction vessel, stirring, adding hydroxyethyl acrylate to react and controlling the temperature, adding polyhydric alcohol to react for a certain time to obtain a polyhydric alcohol modified acrylic polyurethane oligomer; mixing the two oligomers obtained, adding bisphenol A epoxy acrylate and organosilane modified polyurethane acrylate, stirring to react, adding activated monomer, photoinitiator and 0.05-5wt% of thermal stabilizer, and mixingto obtain the ultraviolet light-cured coating for the seamless steel pipe. The coating is used for spraying the seamless steel pipe, and is superior to the traditional ultraviolet light cured coatingin the aspects of rigidity, adhesion, shock resistance, wear resistance, and surface smoothness, flexibility and gloss of film coating.

Description

technical field [0001] The invention relates to a preparation method of an ultraviolet curing coating for seamless steel pipes. Background technique [0002] Corrosion of metals is a phenomenon in which metals are destroyed by chemical or electrochemical action of environmental media, which brings huge losses to the national economy. One of the most effective and common methods of anti-corrosion of metal equipment is to apply anti-corrosion coating on the metal surface to isolate the contact between the corrosive medium and the metal substrate, mainly hot melt asphalt plus wound glass cloth, epoxy resin coating, scale Resin coatings, inorganic zinc-rich coatings, etc. [0003] Before the 1970s, almost all steel pipe anti-corrosion coatings were solvent-based coatings, generally with a solid content of 45 to 55%, high VOC (volatile organic compound) emissions, long construction time, high energy consumption, and easy to cause coating. Defects, it is difficult to meet the an...

Claims

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Application Information

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IPC IPC(8): C09D175/14C09D163/10
Inventor 唐国华杨志祥
Owner 杭州华仙涂料有限公司
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