Thermosetting powder coating composition, film coating manufacturing method and film coating thereof

A technology of thermosetting powders and compositions, applied in the direction of powder coatings, coatings, devices for coating liquids on surfaces, etc.

Inactive Publication Date: 2003-11-19
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the technologies for controlling the thermal melting and thermal curing properties of these paint compositions are at an extremely thin film thickness level of 50 μm or less, which is the target of the present application, especially the standard film thickness of 35 to 40 μm for solvent-based outer layer clear coatings. , the coating composition design that reproduces sufficient smoothness of the coating film without slowing down the thermal curing reaction, and the ultra-high fluidity coating should have thermal melting and thermal curing properties, and in order to specify these thermal melting and thermal curing properties In terms of adequate design specifications developed for the necessary conditions, there is no complete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0094] Put 66.7 parts of xylene into a four-necked flask equipped with a stirrer, a thermometer, a reflux cooling device, and a nitrogen introduction pipe, and heat up to reflux temperature while purging nitrogen. As shown in Table 1., 20 parts of monomer (A-1) styrene, 40 parts of glycidyl methacrylate as monomer (A-2), 38 parts of monomer (A-6) isobornyl acrylate 2 parts, 2 parts of n-butyl methacrylate as a monomer (A-8), and 10 parts of tert-butyl peroxide-2-ethylhexanoic acid as a polymerization initiator were dissolved in the flask. Copolymerization of these monomers was carried out by adding for 5 hours and then maintaining at 100°C for 5 hours. The solvent xylene was removed from the resulting resin solution under vacuum to obtain the acrylate copolymer component (A). The number average molecular weight Mn (measured with GPC) of the obtained acrylate copolymer component (A) is 1520, and the weight average molecular weight Mw (measured with GPC) is 3150, and the epoxy ...

manufacture example 5

[0098] Put 66.7 parts of xylene into a four-necked flask equipped with a stirrer, a thermometer, a reflux cooling device, and a nitrogen introduction pipe, and heat up to reflux temperature while purging nitrogen. As shown in Table 1., 15 parts of monomer (A-1) styrene, 40 parts of glycidyl methacrylate as monomer (A-2), monomer (A-3) isobutyl methacrylate 35 parts of ester, 10 parts of monomer (A-7) methyl methacrylate, and 9 parts of tert-butyl peroxy-2-ethylhexanoic acid as a polymerization initiator were dissolved into the flask dropwise. Copolymerization of these monomers was carried out for 5 hours and then at 100°C for 5 hours. Next, while keeping the obtained resin solution at 100°C, 1 part of 'KR-85' manufactured by Arakawa Chemical Industry Co., Ltd. as an acid-functional rosin (C) was added to the flask, and stirring was continued for 1 hour. , Then, under vacuum, the solvent xylene was removed from the obtained resin solution to obtain the acrylate copolymer compo...

manufacture example 8

[0100] As shown in Table 1, only the type of ethylenically unsaturated monomer used, the composition ratio, and the amount of 'KR-85' manufactured by Arakawa Chemical Co., Ltd. as the acid-functional rosin (C) were changed. , Perform the same operation as the above-mentioned Production Example 5 to obtain the acrylate copolymer component (A). The characteristic value (number-average molecular weight Mn, weight-average molecular weight Mw, epoxy equivalent, glass transition temperature Tg) that the obtained acrylate copolymer component (A) has, and design value (glass transition temperature Tg, solubility Parameters (SP)) are organized in Table 1.

[0101] [Production Example 1 of Dodecanedioic Acid Linear Polyanhydride Used as Curing Agent Component (B)]

[0102] 700 parts of dodecanedioic acid (manufactured by Cayashi Bio Co., Ltd.) and acetic anhydride with a purity of 97% by weight obtained through the carboxylation of both ends of the fermentation using normal alkanes mai...

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PUM

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Abstract

The invention relates to a thermosetting powder coating composition, which is favorable for clear coating of automotive parts and automotive top clear coating, and exhibits, particularly in coating of a thin film of 35 to 50 mu m, excellent appearance (smoothness, gloss, transparency, etc.), physical properties of practical level (hardness, scratch/mar resistance, etc.) and chemical properties (acid resistance, solvent resistance, etc.). The inventive thermosetting powder coating composition comprises a glydicyl group-containing acrylic copolymer component (A) and a curative component (B) composed of dodecanedioic acid linear polyacid anhydride or tetradecanedioic acid linear polyacid anhydride, wherein the time DELTA T required for decrease of the absolute value of a complex elastic modulus ( eta *) of said composition from 100000 Pa.s to 5 Pa.s is not more than 200 seconds, said absolute value of a complex elastic modulus being measured by a dynamic viscoelasticity measuring device under the specific conditions.

Description

technical field [0001] The present invention relates to the cross-linked cured coating film obtained by thermal curing reaction has good appearance characteristics (smoothness, gloss, transparency and others), physical characteristics (hardness, scratch resistance and others), chemical characteristics (acid resistance, Solvent resistance and others), a thermosetting powder coating composition capable of imparting a baked coating film suitable for coating applications such as automobile bodies and vehicle parts. More specifically, it relates to a thermosetting powder coating composition in which the above-mentioned good characteristics can be exhibited even in a clear coating film of 50 micrometers or less that does not substantially contain a coloring pigment. Background technique [0002] Thermosetting powder coatings are environmentally friendly coatings that emit very little solvent, and the market is expanding especially in Europe and the United States, where VOC (Volati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/12B05D7/16C08K5/092C09D5/46C09D133/06C09D133/08
CPCC09D133/06C09D133/08C08K5/092B05D7/16B05D1/12C08L33/068
Inventor 沟口光幸浅见启一广濑义治
Owner MITSUI CHEM INC
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