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Polyester resin for low-temperature cured high-leveling powder coating and preparation method thereof

A powder coating, polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as difficulty in resin leveling, and achieve no orange peel on the surface, smooth and smooth surface, good gloss and impact performance. Effect

Inactive Publication Date: 2020-04-28
JIANGSU RAP RESIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a polyester resin for low-temperature curing high-leveling powder coatings and a preparation method thereof. The polyester resin has good gloss and impact properties after low-temperature curing, and the surface is flat and smooth , to solve the problem of difficult leveling of resins used in low-temperature curing powder coatings, and the leveling level can reach more than 8

Method used

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  • Polyester resin for low-temperature cured high-leveling powder coating and preparation method thereof
  • Polyester resin for low-temperature cured high-leveling powder coating and preparation method thereof
  • Polyester resin for low-temperature cured high-leveling powder coating and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0026] (1) The polyhydric alcohol adopts at least one of neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol, 2-methylpropanediol, and diethylene glycol.

[0027] (2) The polybasic acid includes polybasic acid for esterification and polybasic acid for acidification; the polybasic acid for esterification adopts at least one of terephthalic acid, isophthalic acid, and adipic acid; At least one of trimellitic anhydride and pyromellitic anhydride is used as the polybasic acid.

[0028] (3) The catalyst adopts monobutyl tin oxide.

[0029] (4) The auxiliary agent is at least one of phosphite, organic phosphorus and phenol.

[0030] Further, the preparation method of this low-temperature curing high-leveling powder coating polyester resin can comprise the following steps:

[0031] Each raw material is selected according to the formula of the above-mentioned polyester resin for low-temperature curing and high-leveling powder coating.

[0032] Step 1. Add polyol, polybasic acid for e...

Embodiment 1

[0040] A kind of polyester resin for low temperature curing high leveling powder coating, its preparation method can comprise the following steps:

[0041] Step A1, add 1800 parts by weight of neopentyl glycol, 400 parts by weight of diethylene glycol, 2500 parts by weight of terephthalic acid and 2 parts by weight of monobutyltin oxide into the reaction kettle, raise the temperature to 150 ° C, start stirring, and The rate of 20°C / 60min was raised to about 240°C, and reacted for 8 hours until the system was colorless and transparent, and the acid value reached 13mg KOH / g, and the viscosity reached 450cps@175°C.

[0042] Step A2, cool down the material treated in step A1 to 225°C, use an oil pump to evacuate the polycondensation reaction, and react for 1h at a vacuum degree of -0.09~-0.1Mpa until the acid value reaches 2.5mg KOH / g and the viscosity reaches 1700cps@175°C .

[0043] Step A3. Cool the material treated in step A2 to 190°C, then add 600 parts by weight of trimelli...

Embodiment 2

[0047] A kind of polyester resin for low temperature curing high leveling powder coating, its preparation method can comprise the following steps:

[0048] Step B1. Add 1900 parts by weight of neopentyl glycol, 2100 parts by weight of terephthalic acid, 300 parts by weight of adipic acid and 2 parts by weight of monobutyltin oxide into the reaction kettle, raise the temperature to 150 ° C, start stirring, and set the temperature at 20 ° C Rise to about 240°C at a rate of / 60min, and react for 9h until the system is colorless and transparent, the acid value reaches 12.3mg KOH / g, and the viscosity reaches 550cps@175°C.

[0049] Step B2, cool down the material treated in step B1 to 215°C, use an oil pump to evacuate the polycondensation reaction, and react for 1.5h at a vacuum degree of -0.09~-0.1Mpa until the acid value reaches 2mg KOH / g and the viscosity reaches 1900cps@175°C .

[0050] Step B3. Cool the material treated in step B2 to 190°C, then add 400 parts by weight of tri...

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Abstract

The invention discloses polyester resin for low-temperature curing high-leveling powder coating and a preparation method of the polyester resin. The polyester resin is prepared from the following rawmaterials in parts by weight: 39 to 45 parts of polyhydric alcohol, 52.5 to 59.5 parts of polyacid, 0.01 to 0.08 part of a catalyst and 0.1 to 1.5 parts of an auxiliary agent, wherein the polyhydric alcohol is at least one of neopentyl glycol, 2-butyl-2-ethyl-1,3-propylene glycol, 2-methyl propylene glycol and diethylene glycol, and the polyacid includes polyacid for esterification and polyacid for acidification. The polyester resin prepared by the invention not only has good gloss and impact performance after low-temperature curing, but also has a flat and smooth surface, and the leveling grade can reach 8 or above.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a polyester resin for low-temperature curing high-leveling powder coatings and a preparation method thereof. Background technique [0002] Powder coating is a coating with 100% solid content, without any solvent and moisture, and can be cured and formed into a film only by heating and baking. Therefore, powder coating is a completely environmentally friendly and environmentally friendly coating, which is fully in line with the current environmental protection Demand, is gradually replacing organic solvent-based coatings, becoming an important development trend of environmentally friendly coatings, so it has a very wide range of applications in household appliances, building materials, panels, automobiles and other fields. [0003] Traditional heat-curing powder coatings require a curing temperature of 180-200°C and a curing time of 10-30 minutes, which greatly limits the use of pow...

Claims

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Application Information

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IPC IPC(8): C08G63/668C08G63/20C09D167/00C09D5/03
CPCC08G63/20C08G63/668C09D5/03C09D167/00
Inventor 周琦宋继瑞邓煜东
Owner JIANGSU RAP RESIN TECH CO LTD
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