Polyurethane base paint for coiled material

A polyurethane primer, coil technology, used in polyurea/polyurethane coatings, polyester coatings, coatings, etc.

Inactive Publication Date: 2005-11-30
SHANGHAI HUAYI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the paint film is bending less than or equal to 3T, the impact strength is 9.04J, the pencil hardness is greater than or equal to 4B, and the solvent resistance MEK is greater than or equal to 3 times, and there are certain defects in the foaming property. After foaming, it will stick to the paint film Only 70-80% of the blowing agent on the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 Preparation method of polyurethane primer for coiled material of the present invention

[0056] First prepare polyester resin 1: Add 187.5 kg of neopentyl glycol, 62.5 kg of methyl propylene glycol, 15 kg of adipic acid, 90 kg of isophthalic acid, 30 kg of terephthalic acid, and 15 kg of phthalic anhydride The reaction kettle is slowly heated to 170°C. After melting, add 2 kg of dibutyltin dilaurate catalyst. Continue heating to 240°C. The reaction time is controlled at 10 hours. Finally, the reaction reaches an acid value of 2mgKOH / g and a viscosity of 30 seconds. The amount of water is 32 kg, and then 386.4 kg of heavy aromatic solvent (C9-C10), 138 kg of propylene glycol methyl ether acetate and 27.6 kg of ethylene glycol butyl ether are diluted to a solid content of 40% to obtain polyester resin 1 for use. The measured molecular weight is 8000, the viscosity is 30 seconds, the Tg is 35°C, the hydroxyl value is 34 mg KOH / g, and the acid value is 2 mg KOH / g.

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Embodiment 2

[0060] Example 2 Preparation method of polyurethane primer for coiled material of the present invention

[0061] Weigh 200 grams of polyester resin 1, 120 grams of rutile titanium dioxide powder, 90 grams of zinc chrome yellow powder, 10 grams of strontium chrome yellow powder, 45 grams of butyl acetate and 30 grams of dibasic acid ester, stir well, and then grind to fineness Color paste below 15 for use. The remaining 197 grams of polyester grams of polyester 1, 100 grams of polyester polyester 2 (Uralac SH974 resin produced by DSM company, molecular weight of 15000, Tg of 47 ℃, viscosity of 27 seconds), 65 grams of adipic acid Isocyanate, 10 grams of highly methyl etherified melamine resin, 3 grams of triethylamine, 20 grams of epoxy phosphoric acid compound (molecular weight 500), 66 grams of butyl acetate and 44 grams of dibasic acid ester are mixed uniformly, and the mixture will be ground under stirring. The color paste is slowly added to the above-mentioned pre-mixed contai...

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PUM

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Abstract

A coiled material using polyurethane priming paint is prepared by homogeneously mixing polyester resin 1, polyester resin 2, cross linker, colourant, epoxy phosphate compound, solidification catalyst with solvent. The priming paint has a high solidification speed, resistance to solvent (MEK) can amount to 20 times, and has excellent adhesive force to metallic backing. The lacquer film has perfect toughness, and T curving can obtain 0-2T, applying to the field T curving highly required, such as construction and household electrical appliance, and so on. And it has fine foamobility, the blowing agent cohering on the lacquer film amounting to above 90% after foaming.

Description

Technical field [0001] The invention relates to a polyurethane primer for coiled materials used for color-coated plates of buildings and home appliances. Background technique [0002] At present, the coil coating technology is developing rapidly, and the requirements for coil primer are getting higher and higher. However, polyurethane primers for coils are still blank in China. In foreign countries, some well-known coil coating manufacturers have adopted polyurethane primers to improve the flexibility of the paint film. The performance of the paint film is less than or equal to 3T, the impact strength is 9.04J, the pencil hardness is greater than or equal to 4B, the solvent resistance MEK is greater than or equal to 3 times, and there are also certain defects in the foaming property. After foaming, it adheres to the paint film The above foaming agent is only 70-80%. Summary of the invention [0003] The purpose of the present invention is to overcome the defects in the prior art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00
Inventor 俞剑峰胡丕山黄燕黄有为
Owner SHANGHAI HUAYI FINE CHEM CO LTD
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