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Polyester resin for weather resistant outdoor waterborne paint and preparation method thereof

A water-based coating and polyester resin technology, applied in polyester coatings, coatings, etc., can solve the problems of poor weather resistance and cannot be used for outdoor use, and achieve the effect of improving weather resistance.

Active Publication Date: 2017-06-16
中瀚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

However, conventional sulfonate water-soluble polyester resins use a large number of aromatic diacids or diesters such as terephthalic acid or its esters and phthalic anhydride as raw materials, which are easily degraded by absorbing ultraviolet rays and have poor weather resistance. Cannot be used for outdoor use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 30.4kg of terephthalic acid, 10.4kg of isophthalic acid, 9.1kg of dimethyl isophthalate-5-sodium sulfonate and 30kg of ethylene glycol into a 100L stainless steel reaction kettle, and add 12g of tetrabutyl titanate ester and 55g zinc acetate. Under the nitrogen system, pressurize to 1.0-1.5MPa, raise the temperature to 180-200°C and keep it warm for 1.5 hours, then gradually raise the temperature to 220-240°C and react for 2.5 hours, when the amount of collected by-products reaches the theoretical calculation value, gradually release Press down to normal pressure, and the esterification reaction ends. Add 33g of antimony acetate and 25g of triphenyl phosphate, gradually reduce the pressure to below 100Pa within 0.5 hours, and gradually raise the temperature to 280 degrees to carry out polycondensation reaction. The polymer product was obtained after 3 hours of reaction.

[0034] The product is analyzed by DSC, and the measured glass transition temperature (Tg) is ...

Embodiment 2

[0036]Put 30.4kg of terephthalic acid, 10.4kg of isophthalic acid, 9.1kg of dimethyl isophthalate-5-sodium sulfonate, 19kg of ethylene glycol, and 17.5kg of ethylene glycol into a 100L stainless steel reaction kettle , and add 12g of tetrabutyl titanate and 55g of zinc acetate, pressurize to 1.0-1.5MPa under nitrogen system, raise the temperature to 180-200°C for 1.5 hours, then gradually raise the temperature to 220-240°C for 2.5 hours, When the amount of collected by-products reaches the theoretically calculated value, the pressure is gradually released to normal pressure, and the esterification reaction ends. Add 33g of antimony acetate and 25g of triphenyl phosphate, gradually reduce the pressure to below 100Pa within 0.5 hours, and gradually raise the temperature to 280 degrees to carry out polycondensation reaction. The polymer product was obtained after 4 hours of reaction.

[0037] The product is analyzed by DSC, and the measured glass transition temperature (Tg) is 2...

Embodiment 3

[0039] 14.8 kg of terephthalic acid, 28.6 kg of isophthalic acid, 4.3 kg of dimethyl isophthalate-5-sodium sulfonate, 10.3 kg of ethylene glycol, 21.7 kg of neopentyl glycol, and 2.1 kg of ethylene glycol kg was put into a 100L stainless steel reaction kettle, and 3g of tetrabutyl titanate and 15g of zinc acetate were added. Under the nitrogen system, the pressure was increased to 1.0-1.5MPa, and the temperature was raised to 180-200°C for 1.5 hours, and then the temperature was gradually raised to React at 220-240°C for 2.5 hours. When the amount of collected by-products reaches the theoretically calculated value, gradually release the pressure to normal pressure, and the esterification reaction ends. Add 18 g of antimony acetate and 10 g of triphenyl phosphate, gradually reduce the pressure to below 100 Pa within 0.5 hours, and gradually raise the temperature to 280 degrees to carry out polycondensation reaction. The polymer product was obtained after 5 hours of reaction.

...

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Abstract

The invention provides a preparation method of a polyester resin for weather resistant outdoor waterborne paint. The method includes: firstly taking dicarboxylic acid or its ester and diol as the raw materials, and adding a catalyst to carry out reaction, with the equivalence ratio of alcohol acid reaction being (1.1-2.0):1; in an inert atmosphere, carrying out heat and pressure preservation reaction until the by-product collection amount is greater than a theoretical value by 95%, and controlling the reaction temperature at 180-270DEG C and the pressure at 1-1.5MPa; within 0.5-1h, lowering the pressure to normal pressure, adding a polycondensation catalyst and a stabilizer to carry out polycondensation reaction at a temperature of 210-290DEG C and under a pressure below 500Pa for 1-6h; introducing inert gas to ordinary pressure, and subjecting the melt to extrusion cooling so as to obtain the polyester for weather resistant outdoor waterborne paint. DSC testing finds that the glass transition temperature of the polyester resin for weather resistant outdoor waterborne paint is 20-70DEG C; at a temperature of 35DEG C, o-chlorophenol is solvent, and the inherent viscosity is 0.30-0.70 dL / g; and by means of the hydrophilcity of sulfonate, the polyester resin can be uniformly dispersed in water to form a clear and transparent solution, and the maximum solid content in water can be up to 35%.

Description

technical field [0001] The invention specifically relates to a polyester resin for weather-resistant outdoor water-based paint and a preparation method thereof, belonging to the technical field of polymer material synthesis. Background technique [0002] Polyester is a polymer resin obtained by esterification or transesterification of polybasic acid or its ester and polyol component. It has excellent heat resistance, cold resistance, thermal stability and other excellent properties, so it is used in coatings and adhesives. It is widely used in the mixture industry. Among them, sulfonate water-soluble polyester resins can be used in the coating industry instead of most solvent-based polyester resins because they can be uniformly dispersed in water (or with the addition of a small amount of co-solvent) into a clear and transparent solution. The water-based paint prepared by using this water-soluble polyester resin does not use toxic and volatile organic solvents, greatly redu...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/672C08G63/183C08G63/181C08G63/78C09D167/02
CPCC08G63/181C08G63/183C08G63/672C08G63/6886C08G63/78C09D167/02
Inventor 刘渝付静温天军黄志远
Owner 中瀚新材料科技有限公司
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