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A kind of low viscosity unsaturated polyester and preparation method thereof

An unsaturated, low-viscosity technology, applied in the field of unsaturated polyester, can solve the problems of incomplete curing, short storage period, insufficient activity, etc., and achieve the effect of long storage period, good curing and high activity

Active Publication Date: 2018-09-14
上海众挚化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-viscosity unsaturated polyester, which can solve the problems of insufficient activity, incomplete curing, high viscosity, and short storage period.

Method used

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  • A kind of low viscosity unsaturated polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under a nitrogen atmosphere, mix 274.6 g of maleic anhydride and 291.7 g of n-octanol, heat to a homogeneous system, add 0.15 g of esterification catalyst triphenyl phosphate for the first time, gradually raise the temperature to 70°C, and react for 2 hours.

[0025] 0.15 g of esterification catalyst triphenyl phosphate was added for the second time, 87.5 g of neopentyl glycol was added for the first time, and the temperature was raised to 200° C. to continue the reaction for 2 hours.

[0026] Take samples to measure the acid value of the system. When the acid value is lower than 90mg KOH / g, add 87.5g of neopentyl glycol for the second time, keep warm at 200°C and continue to react for 6 hours;

[0027] Take a sample again to measure the acid value of the system. When the acid value is lower than 10 mg KOH / g, remove the unreacted glycol in a vacuum to obtain the low-viscosity unsaturated polyester A for color paste.

Embodiment 2

[0029] Under a nitrogen atmosphere, mix 325.0 g of fumaric acid and 401.1 g of isooctyl alcohol, heat to a homogeneous system, add 0.12 g of esterification catalyst butyltin for the first time, gradually raise the temperature to 85°C, and react for 1 hour.

[0030] For the second time, 0.15 g of esterification catalyst butyltin was added, and for the first time, 66.8 g of diethylene glycol was added, and the temperature was raised to 200° C. to continue the reaction for 1 hour.

[0031] Take a sample to measure the acid value of the system. When the acid value is lower than 90mg KOH / g, add 84.5g of dipropylene glycol for the second time, keep the temperature at 200°C and continue the reaction for 8 hours;

[0032] Take a sample again to measure the acid value of the system. When the acid value is lower than 10 mg KOH / g, remove the unreacted glycol in a vacuum to obtain the low-viscosity unsaturated polyester B for color paste.

Embodiment 3

[0034] Under a nitrogen atmosphere, mix 274.6g of maleic anhydride and 333.1g of benzyl alcohol, heat to a homogeneous system, add 0.15g of esterification catalyst butyltin for the first time, gradually raise the temperature to 75°C, and react for 2 hours.

[0035] For the second time, 0.15 g of esterification catalyst butyltin was added, and for the first time, 65.6 g of neopentyl glycol was added, and the temperature was raised to 220° C. to continue the reaction for 1 hour.

[0036] Take a sample to measure the acid value of the system. When the acid value is lower than 90mg KOH / g, add 84.5g of dipropylene glycol for the second time, keep the temperature at 220°C and continue the reaction for 8 hours;

[0037] Take a sample again to measure the acid value of the system. When the acid value is lower than 10 mg KOH / g, remove the unreacted glycol in a vacuum to obtain a low-viscosity unsaturated polyester C for color paste.

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Abstract

The invention discloses low-viscosity unsaturated polyester. The structural formula of the low-viscosity unsaturated polyester is as follows: R-O(OC-A-COOC-B-CO)nCOC-CH=CH2-COO-R, wherein A represents dibasic acid or dibasic anhydride; B represents dihydric alcohol; R represents monohydric alcohol; n represents a degree of polymerization. The low-viscosity unsaturated polyester provided by the invention has the advantages that the characteristics of low viscosity, good curing property, long storage period, high activity and the like are obtained, a molecular structure and a molecular weight are controllable, no solvent is contained, and the low-viscosity unsaturated polyester is an ideal low-viscosity unsaturated polyester matrix for color pastes; moreover, weighing and conveyance are facilitated by utilization of the low-viscosity unsaturated polyester, automated machinery production is facilitated, and the low-viscosity unsaturated polyester is widely applied to various color pastes.

Description

technical field [0001] The invention relates to the technical field of unsaturated polyesters, in particular to low-viscosity unsaturated polyesters and a preparation method thereof. Background technique [0002] The traditional paint coloring is to add pigment powder directly into the paint, which has poor color reproducibility, uneven coloring, low tinting strength, serious pollution, and the paint has poor light resistance and weather resistance after film formation, and is prone to fading , Pulverization and other issues. Color paste is a semi-finished product made of pigment or pigment and filler dispersed in paint. [0003] In order to solve the above problems, the resin color paste was prepared with unsaturated polyester as the base. Unsaturated polyester is the most commonly used type of thermosetting resin. It has the advantages of thick paint film, good air drying, high hardness, and crystal clear after polishing. Therefore, the coatings and color pastes prepare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/52C08G63/54C08G63/547C08G63/78
CPCC08G63/52C08G63/54C08G63/547C08G63/78
Inventor 陈继荣张衍
Owner 上海众挚化工科技有限公司