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Powder coating polyester containing organic silicon and preparation method thereof

A technology of silicone powder and powder coating, applied in powder coatings, polyester coatings, coatings, etc., to achieve the effect of improving weather resistance and leveling performance

Inactive Publication Date: 2012-12-26
广东大盈新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing silicone-modified resin products are mainly concentrated in solvent-based and emulsion-based coatings, and silicone-modified polyester resins for powder coatings are still blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1 Prefabricate the silicone intermediate part

[0024] Add 0.5% of aminopropyltriethoxysilane, 20% of neopentyl glycol, 3.6% of ethylene glycol and 0.01% of monobutyl tin oxide into a reactor equipped with a stirrer, a thermometer and a fractionating column, Nitrogen was introduced, the temperature was raised to 110°C, and the reaction was carried out for 1.5 hours to obtain a hydroxyl-containing intermediate modified with an organosilicon terminal;

[0025] Step 2: polycondensation of hydroxyl-terminated polyester resin

[0026] Add 50% terephthalic acid, 15% isophthalic acid, 6.3% adipic acid and 1% trimethylolpropane to the above reaction vessel, and raise the temperature to 240°C while maintaining a nitrogen atmosphere. , carry out esterification reaction until the reaction solution is completely clear; carry out vacuum polycondensation until the acid value is 15mgKOH / g, and obtain a hydroxyl-terminated polyester resin; add 3.0% of 1,2,4-trimellitic anhydride ...

Embodiment 2

[0031] Step 1 Prefabricate the silicone intermediate part

[0032] Add 3% of propyltrimethoxysilane, 22.5% of neopentyl glycol, 4.8% of ethylene glycol and 0.04% of monobutyltin oxide into the reaction kettle equipped with stirrer, thermometer and fractionating column, and pass into Nitrogen, heated up to 110°C, reacted for 1.5 hours, and obtained a hydroxyl-containing intermediate modified with an organosilicon end;

[0033] Step 2: polycondensation of hydroxyl-terminated polyester resin

[0034] Add 20% terephthalic acid, 32.2% isophthalic acid, 10% adipic acid and 1.8% trimethylolpropane to the above reaction vessel, and raise the temperature to 240°C while maintaining a nitrogen atmosphere , carry out esterification reaction until the reaction solution is completely clear; after adding 0.2% of 2,6-di-tert-butyl-p-cresol, carry out vacuum polycondensation until the acid value is 3-15mgKOH / g qualified, and obtain a hydroxyl-terminated polyester resin; Add 5.2% of 1,2,4-tri...

Embodiment 3

[0039] Step 1 Prefabricate the silicone intermediate part

[0040] Add 4.8% of aminopropyltriethoxysilane, 25% of neopentyl glycol, 5% of ethylene glycol and 0.06% of monobutyltin oxide into a reaction kettle equipped with a stirrer, a thermometer and a fractionating column, Nitrogen was introduced, the temperature was raised to 110°C, and the reaction was carried out for 1.5 hours to obtain a hydroxyl-containing intermediate modified with an organosilicon terminal;

[0041] Step 2: polycondensation of hydroxyl-terminated polyester resin

[0042] Add 6.2% of terephthalic acid, 50% of isophthalic acid and 1.6% of trimethylolpropane into the above reaction vessel, and raise the temperature to 200°C under nitrogen protection atmosphere to carry out esterification reaction until The reaction liquid is completely clear; after adding 0.3% of tris(2,4-di-tert-butylphenyl) phosphite, carry out vacuum polycondensation until the acid value is 3-15mgKOH / g, and the hydroxyl-terminated po...

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PUM

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Abstract

The invention relates to powder coating polyester containing organic silicon and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps of: adding organic silicon intermediate, neopentyl glycol, ethylene glycol and catalyst A into a reaction kettle with a stirrer, a thermometer and a fractionating column at normal temperature, feeding nitrogen into the reaction kettle, and increasing temperature to 100-190DEG C for reaction for 0.5-1.5 hours to obtain modified hydroxy-terminated intermediate containing the organic silicon; adding terephthalic acid, isophthalic acid, adipic acid and trimethylolpropane into the reaction kettle, and in the nitrogen protection atmosphere, increasing the temperature to 150-250DEG C for esterification till reaction solution is fully clarified; adding antioxidant, conducting vacuum polycondensation till the acid value is acceptably 3-15mg KOH / g to obtain hydroxy-terminated polyester resin; adding 1, 2, 4-trimellitic anhydride; and adding catalyst B and polymerization inhibitor into the reaction kettle, preserving heat at 180-220DEG C, stirring for 0.5-1 hour and discharging the materials to obtain light yellow solid powder coating polyester containing the organic silicon, wherein the acid value of the powder coating polyester is 30-60mg KOH / g, the glass transition temperature is 40-70DEG C and the viscosity is 10-50 poise.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings chemically modified by organosilicon and a preparation method thereof, in particular to a weather-resistant polyester resin, which belongs to the technical field of material synthesis. Background technique [0002] Powder coating is the most harmless coating technology. Compared with liquid coatings, it has many advantages, such as environmental protection, VOC-free, recyclable, effective use rate of more than 95%, and excellent comprehensive performance of coating film. However, the weather resistance of existing polyesters still cannot meet the market demand, especially for outdoor buildings, automobiles, transportation and other facilities. Overseas, the research on super-weather-resistant outdoor polyester resins is at the forefront, and polyesters that can withstand ten years of exposure in Florida are even available, such as the super-weather-resistant outdoor polyester resins produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/695C09D167/02C09D5/03
Inventor 胡默青邓慕建曹永沂
Owner 广东大盈新材料科技有限公司
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