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Copolymerized polyester and metal primer coating material using same

A technology of copolyester and copolymerization, used in polyester coatings, primers, coatings, etc., can solve the problems of difficult operation, difficulty in increasing the thickness of the coating film, and high solution viscosity, and achieve excellent chemical resistance and high corrosion resistance. The effect of stability and high hardness

Active Publication Date: 2018-03-27
TOYO TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polyols with a main chain of bisphenol A are used as an essential component, which has concerns about health effects, and high-molecular-weight polyesters are used as coatings, if the solid content concentration is high, the solution viscosity will become very high, making handling difficult.
On the other hand, if the solid content concentration is lowered, it is difficult to increase the thickness of the coating film, and a large amount of solvent must be used, so there are economical and environmental problems.

Method used

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  • Copolymerized polyester and metal primer coating material using same
  • Copolymerized polyester and metal primer coating material using same
  • Copolymerized polyester and metal primer coating material using same

Examples

Experimental program
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Effect test

Embodiment

[0071] Hereinafter, examples are given and the present invention will be specifically described. In addition, in this Example and a comparative example, a part shows a mass part.

[0072] (1) Determination of the composition of the copolyester (A)

[0073] Use 400MHz 1 An H-nuclear magnetic resonance spectrometer (hereinafter sometimes abbreviated as NMR) quantifies the molar ratio of the polyvalent carboxylic acid component and the polyhydric alcohol component constituting the copolyester (A). As a solvent, deuterated chloroform was used. In addition, when the acid value of the copolyester is increased by post-addition of acid (Japanese: acid post-addition), the total amount of acid components other than the acid component used in the post-addition of acid is assumed to be 100 mol%, and each value is calculated. The molar ratio of the ingredients.

[0074] (2) Determination of the number average molecular weight of copolyester (A)

[0075] After dissolving 4 mg of the sa...

manufacture example

[0084] 809 parts of dimethyl terephthalate, 793 parts of dimethyl isophthalate, 19 parts of trimellitic anhydride, 407 parts of ethylene glycol, 540 parts of neopentyl glycol, 287 parts of triethylene glycol and 0.03 mol% of tetrabutyl orthotitanate relative to all acid components was charged into a reaction vessel equipped with a stirrer, a condenser, and a thermometer, and the temperature was raised from 160°C to 220°C over 4 hours, while going through the methanol removal process. transesterification reaction. Next, in the polycondensation reaction process, the pressure in the reaction system was reduced to 5 mmHg over 20 minutes, and then the temperature was raised to 250°C. Next, the pressure was reduced to 0.3 mmHg or less, the polycondensation reaction was performed for 60 minutes, and this was taken out. As a result of the compositional analysis by NMR, the mol ratio of the copolyester (a1) obtained is: terephthalic acid / isophthalic acid / trimellitic acid / ethylene glyc...

Embodiment 1

[0090] Preparation of metallic primer paint (A1)

[0091] 80 parts of copolyester (a1) were dissolved in the mixed solvent of 100 parts of cyclohexanone and 100 parts of Solvesso 150. 50 parts of calcium silicate, 13 parts of aluminum tripolyphosphate, and 37 parts of titanium oxide were added thereto, and dispersed for 6 hours using a shaker. Next, 20 parts of CYMEL 303 (manufactured by Allnex, melamine curing agent) as a crosslinking agent and 0.2 part of dodecylbenzenesulfonic acid as a curing catalyst were added to prepare the metal primer paint (Al) of the present invention.

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Abstract

To provide a copolymerized polyester which is effective as a binder component for a metal primer coating material for coil coating. Additionally, to provide a metal primer coating material which has acoating material composition using the copolymerized polyester, and which has excellent surface hardness, bendability, corrosion resistance and chemical resistance. A copolymerized polyester (A) which has, as copolymerization components, a polyvalent carboxylic acid component and a polyhydric alcohol component, and wherein: if the total polyvalent carboxylic acid component is taken as 100% by mole, an aromatic dicarboxylic acid component is contained in an amount of 95-100% by mole and an aliphatic dicarboxylic acid component is contained in an amount of 0-5% by mole; and if the total polyhydric alcohol component is taken as 100% by mole, a glycol component having a specific structure is contained in an amount of 1-30% by mole. This copolymerized polyester (A) has a glass transition temperature within the range of 25-50 DEG C.

Description

technical field [0001] This invention relates to copolyesters and metal primer coatings using the copolyesters. More specifically, the present invention relates to a resin and a coating composition excellent in corrosion resistance and workability. Background technique [0002] Copolyesters are widely used as raw materials for resin compositions such as coating agents, printing inks, and adhesives, and are generally composed of polycarboxylic acids and polyhydric alcohols. Since the flexibility and molecular weight can be freely controlled by selecting and combining polycarboxylic acids and polyhydric alcohols, they are widely used in various applications such as coating agent applications and adhesive applications. [0003] Among them, for precoated metal formed by coating a coating containing a resin component on a metal sheet, a coating using a high-molecular-weight copolyester excellent in coating film flexibility is often used (for example, Patent Document 1). However...

Claims

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Application Information

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IPC IPC(8): C08G63/668C09D5/00C09D167/02
CPCC08G63/668C09D5/00C09D167/02B05D7/14C09D5/002C09D167/025
Inventor 岩下祐司
Owner TOYO TOYOBO CO LTD
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