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Method for synthesizing unsaturated polyester

A synthetic method and unsaturated technology, applied in the field of synthesizing unsaturated polyester, can solve problems such as complex process

Active Publication Date: 2010-05-26
昌德新材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction temperature in this process is slightly lower than that of the general unsaturated polyester reaction, but the reaction is carried out in two steps, and the reaction process still needs to continuously remove the water generated by the esterification reaction, so the process is more complicated

Method used

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  • Method for synthesizing unsaturated polyester
  • Method for synthesizing unsaturated polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 3.016g of cyclohexanediol, 15.392g of phthalic anhydride, 10.192g of maleic anhydride, 0.135g of catalyst cetyltrimethylammonium bromide, and 9.537g of solvent toluene into the reactor, start stirring, and Heating to raise the temperature, condensing and refluxing, reacting the material at 120°C for 1.5h, then cooling down to 90°C, adding 25.48g of epoxycyclohexane dropwise, and reacting for another 5h, adding 0.01wt% of the total weight of the material as a polymerization inhibitor p-benzene Diphenol, vacuumize to 0.050MPa to remove solvent, then add diluent styrene, cool and discharge.

[0029] Synthetic resin products meet the following technical requirements: 1) The appearance is light brown yellow transparent viscous liquid; 2) The acid value is 35.28mgKOH / g; 3) The relative molecular weight is about 1200;

[0030] The unsaturated polyester has a tensile strength of 88 MPa, an elongation at break of 3.2, and a mechanical property retention rate of 83% after the...

Embodiment 2

[0032] Phthalic anhydride is reduced to 5.096g by glutaric anhydride 5.928g and malonic anhydride 8.944g mixture instead of maleic anhydride quality; Catalyst trimethyl benzyl ammonium chloride 0.13g, solvent uses xylene; The amount of methoxyphenol added is equivalent to 0.1wt% of the total weight of the material; the solvent is removed by vacuuming at 0.099 MPa; the others are the same as in Example 1.

[0033] Synthetic resin products meet the following technical requirements: 1) The appearance is light brown yellow transparent viscous liquid; 2) The acid value is 40.04mgKOH / g; 3) The relative molecular weight is about 1100.

[0034] The unsaturated polyester has a tensile strength of 80 MPa, an elongation at break of 3.0, and a mechanical property retention rate of 80% after thermo-oxidative aging.

Embodiment 3

[0036] The quality of maleic anhydride is increased to 15.249g, and phthalic anhydride is replaced by hexahydrophthalic anhydride, and the quality is 8.008g; Solvent; Others are with embodiment 1.

[0037] The synthetic resin meets the following technical requirements: 1) The appearance is a brownish-yellow transparent viscous liquid; 2) The acid value is 34.7mgKOH / g; 3) The relative molecular weight is about 1300.

[0038] The unsaturated polyester has a tensile strength of 82MPa, an elongation at break of 3.1, and a mechanical property retention rate of 84% after thermo-oxidative aging.

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Abstract

The invention provides a method for synthesizing unsaturated polyester. The method comprises the following steps: adding dibastic alcohol, saturated anhydride and unsaturated anhydride to a reactor in a molar ratio of 1:m:n, wherein m is equal to 0 to 7, and n is equal to 1 to 8; adding catalysts equal to 0.05 to 0.35 percent of the total weight of dibastic alcohol, saturated anhydride and unsaturated anhydride and organic solvent equal to 10 to 50 percent of the total weight thereof; raising temperature to between 100 and 150 DEG C for 0.5 to 3 hours of esterification; reducing temperature to between 90 and 140 DEG C; adding L mol of epoxy cyclohexane dropwise, wherein L is more than or equal to m+n-1, and less than or equal to 2(m+n); continuing to react for 2 to 7 hours; and redistilling the obtained product to remove the organic solvent. All reaction processes of the method are ring-opening addition reaction with high reaction activity and no generation of byproducts, and the production process of the method has the characteristics of low energy consumption, simple production process and the like. The unsaturated polyester synthesized by the method contains a large number of saturated six-membered ring structures, and material formed from the unsaturated polyester has high strength and high-temperature resistance.

Description

technical field [0001] The invention relates to a method for synthesizing unsaturated polyester, in particular to a method for synthesizing unsaturated polyester with epoxycyclohexane as the main raw material. Background technique [0002] With the development of social economy, polymer materials play a pivotal role in the application of various industries. Compared with other polymer materials, unsaturated polyester resin has good processing characteristics and can be cured at room temperature and normal pressure. Molding, no release of any by-products and other characteristics, so that the application of unsaturated polyester is becoming more and more extensive. [0003] Due to the development of the automobile and electronics industries, there is an increasing demand for high-temperature resistant materials. However, general unsaturated polyesters cannot meet the requirements of high-strength and high-temperature resistance. Therefore, high-strength and high-temperature-r...

Claims

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Application Information

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IPC IPC(8): C08G63/676C08G63/58
Inventor 邓剑如陈燕辉蒋卫和屈铠甲
Owner 昌德新材科技股份有限公司
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