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Preparation method of polyester resin capable of being used for outdoor dry mixed extinction powder coating

A technology of matting powder coating and polyester resin, applied in powder coating, polyester coating, coating and other directions, can solve the problem of large drift of extinction degree, and achieve the effect of convenient material selection, stable effect and matting effect.

Inactive Publication Date: 2012-10-10
佛山市顺德区伊诗德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The matting effect of the coating film is easily affected by factors such as the type of pigments and fillers, mixing effect, baking temperature and mixing ratio, and the degree of matting drifts greatly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 53% of terephthalic acid, 36.8% of 1,6-hexanediol, 0.1% of monobutyltin oxide, 0.1% of Triphenyl phosphate and 10% adipic acid are passed through nitrogen, then the temperature is rapidly raised to 260°C, kept at this temperature until it becomes clear, cooled to 220°C, and vacuum dehydration polycondensation is carried out at this temperature. Finally remove the vacuum, discharge the material to the stainless steel plate while it is hot, and cool to room temperature to obtain an acid value of 52.2 mgKOH / g, a viscosity of 26P (broolfield cone-plate viscometer, 200°C), a glass transition temperature of 58°C, and a number-average relative molecular weight The quality is 2236, and the appearance is pale yellow transparent solid A-component polyester resin. They are mass ratios.

[0022]Add 36.5% neopentyl glycol, 3% trimethylolpropane, 60% terephthalic acid and 0.05% ethylene glycol antimony to a reaction kettle equipped with a stirrer, thermometer, fractionating colu...

Embodiment 2

[0025] Add 58% terephthalic acid, 0.9% fumaric acid, 33% neopentyl glycol, 5.8% ethylene glycol and 2.1% 2-methyl-1,3-propanediol, 0.1% isopropyl titanate and 0.1% 2,2-thiobis{3-(3,5-di-tert-butyl-4-hydroxyphenyl) Ethyl propionate}, pass nitrogen, heat to 260°C, keep warm for 4 hours, until the reaction solution is completely clear; then cool down to 235°C, carry out vacuum dehydration and polycondensation reaction at this temperature, and obtain A component polyester resin. The polyester resin has an acid value of 62 mgKOH / g, a viscosity of 32P (broolfield cone and plate viscometer, 200°C), and a glass transition temperature of 58°C. They are mass ratios.

[0026] Add 60% terephthalic acid, 2.4% sebacic acid, 33% neopentyl glycol, 4% diethylene glycol, 0.08 % of monobutyltin oxide and 0.52% of 2,6-di-tert-butyl-p-cresol and 2,5‵-di-tert-butyl-p-diphenol compound antioxidant, nitrogen, heated to 270°C, Keep it warm for three hours until the reaction liquid becomes completel...

Embodiment 3

[0029] In a reactor equipped with a stirrer, thermometer, fractionating column and nitrogen inlet, add 51.8% of terephthalic acid, 37.2% of 1,4-hexanediol, 0.2% of monobutyl dihydroxy tin chloride, 3.68% of azelaic acid, 7% of trimellitic anhydride and 0.12% of β-(3,5-di-tert-butyl-4-hydroxyphenyl) pentaerythritol propionate, nitrogen gas, rapid heating to 250 ° C, at this temperature Keep warm until clear. Lower the temperature to 220°C, and carry out vacuum dehydration polycondensation reaction at this temperature. Finally, the vacuum was removed, and the material was discharged to a stainless steel plate while it was hot, and cooled to room temperature to obtain a component A polyester resin in the form of a pale yellow transparent solid. The polyester resin has the following properties: an acid value of 115 mgKOH / g, a viscosity of 35P (broolfield cone and plate viscometer, 200°C), a glass transition temperature of 58°C, and a number average relative molecular mass of 2536...

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Abstract

The invention relates to a preparation method of polyester resin capable of being used for an outdoor dry mixed extinction powder coating. The preparation method is characterized by comprising the following steps of: adding polybasic acid or anhydride, polyatomic alcohol, a catalyst and an antioxidant according to a mass ratio into a reaction kettle for mixing; introducing nitrogen; heating to a temperature of 100-300 DEG C until a reaction solution is completely clarified to obtain A-component polyester resin; adding polybasic acid or anhydride, polyatomic alcohol, a catalyst and an antioxidant into the reaction kettle to be mixed; introducing nitrogen; heating to a temperature of 100-300 DEG C until a reaction solution is completely clarified; and carrying out vacuum condensation polymerization on the clarified reaction solution until an acid value is 10-50 mg KOH / g and a viscosity is 30-100 P to obtain B-component polyester resin; mixing the A-component polyester resin with triglycidyl isocyanurate, barium sulfate, titanium dioxide, a flatting agent, a brightener and benzoin according to a mass ratio to obtain a powder coating I; mixing the B-component polyester resin with triglycidyl isocyanurate, barium sulfate, titanium dioxide, a flatting agent, a brightener and benzoin to obtain a powder coating II; and mixing the powder coating I with the powder coating II to obtain the powder coating with low brightness. The preparation method has the advantages of stable extinction effect of outdoor dry mixed extinction polyester, better coating property and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyester resin that can be used for outdoor dry-mixed matting powder coatings. The material is a main raw material for manufacturing outdoor low-gloss powder coatings and belongs to the technical field of material synthesis. Background technique [0002] At present, powder coatings are widely used outdoors, and their varieties are increasing, but they are mainly high-gloss types. With the improvement of production quality, people are no longer satisfied with the monotonous gloss, so powder coatings for outdoor use with different gloss have emerged as the times require. The surface gloss of the coating film is selected according to the subjective and objective conditions such as the user's aesthetics and actual use requirements. In general, noble, beautiful, and luxurious decorations require high gloss, while quiet, comfortable, and elegant environments require low gloss. Generally, machinery used ou...

Claims

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Application Information

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IPC IPC(8): C09D167/02C09D167/06C09D5/03C08G63/183C08G63/20C08G63/52C08G63/672C08G63/199
Inventor 邓慕建张良务曹永沂祁永华龚兴宇
Owner 佛山市顺德区伊诗德新材料科技有限公司
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