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Environment-friendly polyurethane primer used universally by coiled materials and application thereof

A general environmental protection and primer technology, applied in the primer field, can solve the problems of difficult liquid discharge, chromium ion toxicity, etc., and achieve the effects of excellent adhesion, good social and economic benefits, and fast curing speed

Inactive Publication Date: 2010-06-16
ZHENHUA COATING MFG FACTORY OF SHANGHAICOATINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the toxicity of chromium ions, it brings difficulties to the discharge of liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of polyurethane primer for coil material of the present invention

[0059]First prepare polyester resin 1: add 187.5 kg of neopentyl glycol, 62.5 kg of methylpropanediol, 15 kg of adipic acid, 90 kg of isophthalic acid, 30 kg of terephthalic acid, and 15 kg of phthalic anhydride Reactor, slowly heated to 170 ° C, after melting, add 2 kg of dibutyltin dilaurate catalyst, continue to heat to 240 ° C, the reaction time is controlled at 10 hours, the final reaction reaches an acid value of 2 mgKOH / g, viscosity 30 seconds, out The amount of water was 32 kg, and then diluted with 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 to a solid content of 40%, to obtain polyester resin 1, which was set aside. 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.

[0060] Prep...

Embodiment 2

[0067] The preparation method of polyurethane primer for coil material of the present invention

[0068] Weigh 200 grams of polyester resin 1, 90 grams of rutile titanium dioxide powder, 60 grams of calcium ion exchange antirust pigment, 45 grams of butyl acetate and 30 grams of dibasic acid ester, stir evenly, and then grind to fineness below 15 μm. pulp, spare. The remaining 197 grams of polyester resin 1, 100 grams of polyester resin 2 (Uralac SH974 resin produced by DSM company, molecular weight is 15000, Tg is 47 ℃, viscosity is 27 seconds), 65 grams of adipic acid diisocyanate, 10 Gram highly methyl-etherified melamine resin, 3 gram triethylamine, 20 gram epoxy phosphoric acid compound (molecular weight 500) and 66 gram butyl acetate and 44 gram dibasic acid ester mix homogeneously, under agitation, the milled paste Slowly add the above premixed material into the container to obtain the primer solution.

[0069] The performance test is shown in Table 3:

[0070] table...

Embodiment 3

[0073] The preparation method of polyurethane primer for coil material of the present invention

[0074] Weigh 200 grams of polyester resin 1, 120 grams of rutile titanium dioxide powder, 20 grams of calcium ion exchange anti-rust pigment, 45 grams of butyl acetate and 30 grams of dibasic acid ester, stir evenly, and then grind to fineness below 15 μm. pulp, spare. The remaining 197 grams of polyester resin 1, 100 grams of polyester resin 2 (Uralac SH974 resin produced by DSM company, molecular weight is 15000, Tg is 47 ℃, viscosity is 27 seconds), 65 grams of adipic acid diisocyanate, 10 Gram highly methyl-etherified melamine resin, 3 gram triethylamine, 20 gram epoxy phosphoric acid compound (molecular weight 500) and 66 gram butyl acetate and 44 gram dibasic acid ester mix homogeneously, under agitation, the milled paste Slowly add the above premixed material into the container to obtain the primer solution.

[0075] The performance test is shown in Table 4:

[0076] Tab...

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Abstract

The invention relates to an environment-friendly polyurethane primer used universally by coiled materials and application thereof. The polyurethane primer is prepared by mixing the following components by weight ratio: 30-50 of polyester resin 1, 0-20 of polyester resin 2, 6-8 of crosslinking agents, 20-30 of pigments, 1-5 of epoxy phosphate compounds, 0.2-1 of curing catalyst and 12-20 of solvents, wherein the pigment comprises titanium dioxide powder and an anti-corrosive pigment in a ratio of 1-3:1; the titanium dioxide powder is rutile type; and the anti-corrosive pigment is a calcium ion exchange antirust pigment without heavy metal ions. The environment-friendly polyurethane primer contains no toxic components such as heavy metal ions and polybrominated biphenyl in the production process and in the formula and reaches the European Union RoHS standard requirement.

Description

【Technical field】 [0001] The invention relates to a primer, in particular to a general-purpose environmental-friendly polyurethane primer for coils and its application. 【Background technique】 [0002] At present, the coil coating technology is developing rapidly, and the requirements for the coil primer are getting higher and higher. The applicant applied for a polyurethane primer for coils in 2005, and the application number of this case is CN200510025419.3. The polyurethane primer uses two polyester resins and a crosslinking agent as base materials, and prepares a coil primer that can be used in conjunction with a coil topcoat through the use of catalysts, auxiliary agents and solvents. The paint film prepared by the primer has good flexibility, and the T bend can reach 0-2T. At the same time, because the hydroxyl value of the polyester resin reaches 32-40mgKOH / g, the crosslinking density is high, and the solvent resistance (MEK) can reach 20 times, when painting, the an...

Claims

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Application Information

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IPC IPC(8): C09D175/06
Inventor 胡丕山黄燕宋媛媛石剑峰庄晓彤
Owner ZHENHUA COATING MFG FACTORY OF SHANGHAICOATINGS
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