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Method of preparing unsaturated polyester resin

A polyester resin, unsaturated technology, applied in the field of preparation of unsaturated polyester resin, can solve the problem of affecting the physical and chemical properties of gel coat resin, the unsaturated polyester molecular weight distribution index can not be well adjusted, and the unsaturated polyester can not be well controlled Saturated polyester resin physical and chemical properties and other issues, to achieve the effect of good physical and chemical properties

Active Publication Date: 2007-10-24
CHANGZHOU TIANMA GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because there are many kinds of unsaturated polyesters, their raw materials and proportions are often quite different, so this method for judging the end point of the reaction can only better adjust the molecular weight of the prepared unsaturated polyesters, and cannot better Adjusting the molecular weight distribution index of the prepared unsaturated polyester also leads to poor control of the physical and chemical properties of the prepared unsaturated polyester resin, which also affects the gel coat made of the unsaturated polyester resin Physical and chemical properties of resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Present embodiment is the preparation method of ortho-phthalic unsaturated polyester resin, has the following steps:

[0030] ① Prepare phthalic anhydride, maleic anhydride and propylene glycol, and make the molar ratio of phthalic anhydride, maleic anhydride and propylene glycol be 1: 0.5: 1.58;

[0031] ②Put the prepared phthalic anhydride, maleic anhydride and propylene glycol into the reactor for melt polycondensation reaction, and control the reaction conditions at 185°C to 195°C. When the viscosity is 0.8Pa·s and the acid value is 25, stop the reaction;

[0032] ③ Add styrene to the liquid mixed material obtained after the reaction, and the weight ratio of the mixed material to the added styrene is 65:35; after it is stirred evenly, it can be used as a finished unsaturated polyester resin.

[0033] The molecular weight of the finished unsaturated polyester resin prepared in this embodiment is 2200, and the molecular weight distribution index is 2.2.

[0034] The r...

Embodiment 2 to Embodiment 7

[0036] The rest are basically the same as in Example 1, except that the ratio of raw materials used and the reaction control conditions are different. The relevant data of each example are shown in Table 1.

Embodiment 8 to Embodiment 73

[0038] Embodiment 8 to embodiment 73 are preparation methods of other unsaturated polyester resins, each embodiment is basically the same as embodiment 1, the difference is that the raw materials used in each embodiment and their proportioning and reaction control conditions are different, The relevant data of each embodiment are shown in Table 2 to Table 12.

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Abstract

The invention discloses a making method of unsaturated polyester resin, which comprises the following steps: 1. preparing dibasic acid and dibasic alcohol with molar rate at 1: (1-1. 2); setting the molar rate of saturated dibasic acid and unsaturated dibasic acid at 1: (0. 5-2. 0); 2. adding the prepared dibasic acid and dibasic alcohol into the reactor to fuse and polymerize; obtaining the condensation polymer; controlling the reacting condition at 170-215 deg. c; making the viscosity of composition in the liquid at 0. 45Pa.s-1. 1Pa.s, acid value at 12-30; stopping reacting; 3. adding phenylethene in the composition; stirring evenly as the product.

Description

technical field [0001] The invention relates to a preparation method of unsaturated polyester resin. Background technique [0002] A considerable part of unsaturated polyester resin products are used as matrix resins for the manufacture of gel coat resins. Gel coat resin is mainly used on the surface of resin products as a continuous covering thin layer. The role of gel coat resin is to provide a protective layer for the resin layer or composite material covered by it, improve the weather resistance, corrosion resistance, wear resistance and other properties of the product, and give the product a bright and beautiful appearance. [0003] Since the gel coat resin should play an important role in protecting the performance of the product and prolonging the service life, the gel coat resin must have good water resistance, chemical resistance, corrosion resistance, wear resistance, impact resistance, etc., and its mechanical properties must be high. Toughness and resilience. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/181
Inventor 敖文亮朱文元刘臣柱杨令
Owner CHANGZHOU TIANMA GROUP CO LTD
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