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Thick plate polyurethane primer and preparation method thereof

A technology of polyurethane primer and polyester resin, which is applied in the field of coatings, can solve the problems of poor performance of the primer, and achieve the effects of high salt spray resistance, good flexibility and excellent adhesion

Inactive Publication Date: 2016-05-25
NIPPON PAINT TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of poor performance of the primer in the prior art, the purpose of the present invention is to provide a polyurethane primer for thick plates, the T-bend of the primer can reach 0T without cracks, excellent adhesion, and salt spray resistance for 1000 hours without abnormality. technical effect

Method used

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  • Thick plate polyurethane primer and preparation method thereof
  • Thick plate polyurethane primer and preparation method thereof
  • Thick plate polyurethane primer and preparation method thereof

Examples

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Embodiment 1

[0055] A preparation method for thick plate polyurethane primer, comprising the following steps:

[0056]1) Mix 20 parts of polyester resin SKYBONES42020 parts, pigment titanium dioxide R-99620 parts, 5 parts of barium sulfate PRECIPITATEDBARIUMSULFATE, anti-settling agent CAB-O-SILM-50.2 parts, add solvent S-100# aromatic hydrocarbon solvent 3 parts, isophorone 5 parts, ground to a fineness of no more than 15 μm to obtain a slurry; the polyester resin is a large molecular weight saturated polyester resin with a molecular weight of 16,000, a hydroxyl value of 4-8 mgKOH / g, and an acid value of 0-13 mgKOH / g. The use of high molecular weight linear or partially branched polyester resin can ensure high flexibility, processability and adhesion of the coating. If the hydroxyl value of the polyester resin is too high, the reactive groups cannot react completely, which will affect the water resistance of the film; if the hydroxyl value is too low, the reactive groups will be insuffici...

Embodiment 2

[0063] A preparation method for thick plate polyurethane primer, comprising the following steps:

[0064] 1) 17 parts of polyester resin SKYBONES42019 parts of pigment titanium dioxide R-99619 parts, barium sulfate PRECIPITATEDBARIUMSULFATE 5 parts, anti-settling agent CAB-O-SILM-50.2 parts, solvent S-100# aromatic hydrocarbon solvent 2 parts, isophorone 4 parts , mixed, and ground to a fineness of not more than 15 μm to obtain a slurry; the polyester resin has a molecular weight of 16,000, a hydroxyl value of 4-8 mgKOH / g, and an acid value of 0-13 mgKOH / g.

[0065] 2) Add SKYBONES4208 parts of polyester resin, 4 parts of isocyanate DESMODUR3175SN and 1 part of organic tin catalyst DBTL to the slurry; add 36 parts of amino resin YP56036 parts, acid catalyst CATALYST60000.4 parts, epoxy resin EPIKOTE828EL2.9 parts, leveling and defoaming 1 part of EFKA36000 part, 0.8 part of adhesion promoter TZ-8805, add 2 parts of solvent S-100# aromatic hydrocarbon solvent, 3 parts of isopho...

Embodiment 3

[0069] A preparation method for thick plate polyurethane primer, comprising the following steps:

[0070] 1) Take 14 parts of polyester resin SKYBONES42014 parts, pigment titanium dioxide R-99614 parts, barium sulfate PRECIPITATEDBARIUMSULFATE 5 parts, anti-settling agent CAB-O-SILM-50.2 parts, solvent S-100# aromatic hydrocarbon solvent 3 parts, isophorone 5 parts , mixed, and ground to a fineness of not more than 15 μm to obtain a slurry; the polyester resin has a molecular weight of 16,000, a hydroxyl value of 4-8 mgKOH / g, and an acid value of 0-13 mgKOH / g.

[0071] 2) Add 4204 parts of polyester resin SKYBONES, 3 parts of isocyanate DESMODUR3175SN, 1 part of organic tin catalyst DBTL, and mix them; add 32 parts of amino resin YP56032, acid catalyst CATALYST60000.4 parts, epoxy resin EPIKOTE828EL1.6 parts, leveling agent Foam agent EFKA36001 part, adhesion promoter TZ-88050.8 part, add solvent S-100# aromatic hydrocarbon solvent 2 parts, isophorone 3 parts, cyclohexanone 1 ...

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Abstract

The invention discloses a thick plate polyurethane primer which comprises the following ingredients in parts by weight: 17-35 parts of polyester resin, 2-6 parts of amino resin, 2-6 parts of isocyanate, 1.5-2.9 parts of epoxy resin, 18-25 parts of pigment, 0.7-6 parts of an auxiliary agent and 8-20 parts of a solvent. The invention also discloses a preparation method of the thick plate polyurethane primer. The T bend of the thick plate polyurethane primer provided by the invention can reach 0T without cracks, the flexibility is good, and a paint peeling phenomenon is avoided in a processing process; the salt spray resistance is high; by virtue of cooperation of the thick plate polyurethane primer and a polyester topcoat with common performances, the salt spray test achieves grade 1 within 1000 hours; the adhesive force with a substrate and the adhesive force with the topcoat are superior to those of traditional epoxy primer and polyester primer. Compared with the traditional primer, the thick plate polyurethane primer provided by the invention has relatively excellent adhesive force, flexibility and chemical corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a thick plate polyurethane primer and a preparation method thereof. Background technique [0002] In recent years, the field of application of pre-coated coils in my country has continued to expand, from the previous construction field (such as exterior walls, interior decoration, etc.) to the home appliance industry (such as refrigerators, microwave ovens, etc.), and even the field of transportation. The pre-coated coil has been coated and can be directly processed and formed. Therefore, it is required to have high strength and good machinability. In addition, when pre-coated coils are applied to construction, home appliances, and transportation, the application conditions are relatively harsh, so they need to have good corrosion resistance and physical shielding properties. [0003] For the composite coating of pre-coated coils, the primer is the foundation, which greatly aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D161/32C09D163/00C09D7/12C09D5/08C08G18/42
CPCC08G18/42C08L2205/03C08L2205/035C09D5/08C09D175/06C09D7/61C08L61/32C08L63/00C08K2003/3045C08K2003/2241
Inventor 于东澳黄雨花
Owner NIPPON PAINT TIANJIN
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