Environment-friendly styrene-free unsaturated polyester resin synthesis method

A technology of styrene-free and polyester resin, which is applied in the synthesis field of environment-friendly unsaturated polyester resin, can solve the problems of not achieving styrene volatilization, reducing styrene volatilization by a small amount, and reducing volatilization, so as to protect human health, Effect of improving mechanical properties and improving bonding performance

Active Publication Date: 2016-06-01
HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is: the use of film-forming additives that inhibit styrene volatilization can only reduce the volatilization of styrene by a small amount, and generally can only reduce the volatilization of styrene by 30%, which cannot meet the requirements of environmental protection and low styrene volatilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step (1) Polymerization Put 444g of phthalic anhydride, 49g of maleic anhydride and 495g of diethylene glycol into a four-necked flask in turn, blow nitrogen and heat, start stirring, slowly raise the temperature to 160°C, and maintain this After 1 hour, gradually increase the temperature to 190-210°C, control the temperature of the distillation head to be lower than 105°C, until the acid value reaches or approaches 60mgKOH / g, stop nitrogen, start vacuuming, and keep the temperature within 200°C until the acid value reaches or approaches 60mgKOH / g. When the value is less than 10mgKOH / g, it is the end point of the reaction. Cool down to 80° C. and add 0.16 g of hydroquinone as a polymerization inhibitor to discharge to obtain a double-terminated hydroxyl unsaturated polyester with a predetermined average degree of polymerization of 3.

[0033] Step (2) Copolymerization Add 800gTPGDA and 580.4gMDI to a new three-necked flask, then heat up to 60°C under stirring, then add ...

Embodiment 2

[0036] 664g of isophthalic acid, 116.07g of maleic acid, and 456.54g of propylene glycol are dropped into the device shown in Example 1. In the subsequent steps, the crosslinkable monomers can be changed into 820g of HDDA, and the isocyanate in the copolymerization step Change it to 312g of TDI, change the catalyst to add 2.1g of dibutenyl tin dilaurate, change the HPMA in step (3) to 252g, change the polymerization inhibitor to add 0.2g methyl hydroquinone and 0.1g Tertiary butyl hydroquinone, all the other are operated in the same steps as in Example 1.

Embodiment 3

[0038] With adipic acid 292.3g, fumaric acid 116.07g, propylene glycol 198g, diethylene glycol 106g drops in the device shown in embodiment 1, the polymerization inhibitor in the first step is changed into 0.08g p-phenylene Diphenol and 0.09g p-tert-butylcatechol, in the subsequent steps, change the cross-linkable monomer into 600g of HDDA and 182g of TMPTA, change the copolymerized blocked isocyanate into 274g of MDI, and change the catalyst into 2.4g Triethylenediamine, change the end-capped hydroxyacrylate into 148g of HEMA in step (3), change the polymerization inhibitor into 0.14g methyl hydroquinone and 0.08g tert-butyl hydroquinone, and all the other press and The same step operation as in Example 1.

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PUM

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Abstract

The invention relates to an environment-friendly unsaturated polyester resin synthesis method, aims at solving the technical problem of exhaust of harmful gas of styrene in ordinary products, and belongs to the technical field of unsaturated polyester resin synthesis. The synthesis method is characterized in that saturated binary acid, unsaturated binary acid and dihydric alcohol which has the total mass percentage being 25 percent to 55 percent are sequentially fed into a reaction container; nitrogen gas is introduced, and temperature rise is performed, so that polymerization reaction is performed, and double-end hydroxyl unsaturated polyester is obtained; according to the hydroxyl molar weight n of the obtained product, isocyanate is added into an acrylic crosslinking monomer; then, the double-end hydroxyl unsaturated polyester is added, so that the isocyanate and the double-end hydroxyl unsaturated polyester are subjected to copolymerization, and a segmented copolymer with -NCO groups at two ends is obtained; the molar weight N of the -NCO of the segmented copolymer is determined; 1.03N mole of hydroxyl acrylate is slowly dripped. The synthesis method has the advantages that the resin product does not contain the styrene, so that the requirement of environment protection is achieved, and the body health of workers is protected.

Description

technical field [0001] The invention relates to a synthesis method of an environment-friendly unsaturated polyester resin, in particular to a synthesis process of unsaturated polyester resin modified by block copolymerization of hydroxyacrylate and isocyanate, which belongs to the technical field of synthesis process of unsaturated polyester resin . Background technique [0002] Styrene plays a dual role of diluent and crosslinking agent in unsaturated polyester resin. It is cheap, has high reactivity with unsaturated polyester, and is a good solvent for various polyester resins. Therefore, styrene is still the most active monomer used in the synthesis process of unsaturated polyester resin, usually accounting for 30%-50% of the resin mass. However, the vapor pressure of styrene at room temperature is 0.7kPa (20°C), and its boiling point is 145°C. It is volatile. During the molding process of FRP, especially in the mold opening molding processes such as injection, large-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08G18/68C08G18/67C08G63/676C08G63/54C08G63/52
CPCC08F283/01C08G18/672C08G18/68C08G18/683C08G63/52C08G63/54C08G63/676C08F222/145
Inventor 刘华吕晓平黄志超钱建华刘坐镇
Owner HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH
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