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Method for synthesizing unsaturated polyester resin

A synthetic method and technology of polyester resin, which is applied in the field of synthesizing unsaturated polyester resin from renewable vegetable oil, can solve the problems of high cost and waste of resources, and achieve the effect of reducing production cost, low curing shrinkage rate and good application prospect

Active Publication Date: 2008-08-27
江苏大力士云石护理材料有限公司
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Problems solved by technology

[0002] In recent years, synthetic resin has become the synthetic material with the highest output and the largest demand. Among them, unsaturated polyester resin is the most used thermosetting resin. Unsaturated polyester resin is mainly used to improve the resin formula and produce resin with special functions. Broaden its application fields, but these are raw materials for chemical industry, the cost of resin synthesis is relatively high, and it is a waste of resources

Method used

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

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preparation example Construction

[0014] The synthetic method of unsaturated polyester resin provided by the invention can adopt the method comprising the following steps:

[0015] (1) Ingredients: weigh renewable vegetable oil, organic polyol, organic unsaturated acid or anhydride, organic saturated acid or anhydride, catalyst, polymerization inhibitor and crosslinking agent according to the formula;

[0016] (2) Alcoholysis, polycondensation reaction: put into the reactor renewable vegetable oil, organic polyol and catalyst, after charging N 2 Stir under protection, and carry out alcoholysis reaction at 200~240℃ for 0.5~1.5h, then gradually reduce the alcoholysis reaction temperature to 160~200℃, then add organic unsaturated acid or acid anhydride, organic saturated acid or acid anhydride , keep the temperature for 3.5 ~ 5h for polycondensation reaction, when the acid value reaches 40 ~ 60mgNaOH / g, it is the end point of polycondensation reaction, and finally add the polymerization inhibitor;

[0017] (3) D...

Embodiment 1

[0034] Embodiment 1: in parts by mass, linseed oil 60%, glycerol 17% and calcium hydroxide 0.05% are dropped in the reactor, after charging into N 2 Stir vigorously under the condition of 220°C for 0.5~1.5h, gradually reduce the reaction temperature to 160°C~200°C, then add 10% maleic anhydride and 12.95% phthalic anhydride, and keep the temperature After 3.5-5 hours, the acid value of the system reaches about 50mgNaOH / g, which is the end of the reaction; when the temperature is lowered to 120°C-130°C, it is blended with an appropriate amount of styrene, stirred evenly and cooled to room temperature, and the unsaturated polyester resin is obtained.

Embodiment 2

[0035] Embodiment 2: by mass parts, castor oil 50%, glycerol 15% and Lithium Hydroxide 0.1% drop in the reaction kettle, after filling N 2 Under the condition of strong stirring, react at 210°C for 1-1.5h, then add 15% of maleic anhydride and 19.9% ​​of phthalic anhydride, and the rest are basically the same as in Example 1.

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Abstract

The invention relates to a process for synthesizing unsaturated polyester resin with renewable vegetable fat, which comprises generating acid ester through conducting alcoholysis reaction for vegetable oil and organic polyatomic alcohol, using as modified dihydric alcohol and being leading to the typical synthesis formulation of unsaturated polyester resin, completely replacing conventional dihydric alcohol, using for synthesizing unsaturated polyester, and then mixing with cross-linking monomer. The resin which is synthesized has excellent hue, appropriate viscosity, excellent heat stability, favorable alkali resistivity, wonderful flexible property and low shrinking rate, which is suitable for various composite material shaping technology such as hand lay-up, winding and spraying and the like. Renewable raw material of vegetable oil with cheap price is applied in the synthesis process of the invention, and the stability of product is excellent.

Description

technical field [0001] The invention relates to the technical field of high molecular polymers, in particular to a method for synthesizing unsaturated polyester resin from renewable vegetable oil. Background technique [0002] In recent years, synthetic resin has become the synthetic material with the highest output and the largest demand. Among them, unsaturated polyester resin is the most used thermosetting resin. Unsaturated polyester resin is mainly used to improve the resin formula and produce resin with special functions. To broaden its application field, but these are the raw materials for the application of chemical industry, the cost of resin synthesis is relatively high, and it is also a waste of resources. Therefore, cost saving and utilization of renewable resources have become the current development trend. [0003] Chinese patent CN1283645A discloses entitled "Manufacturing Method of Unsaturated Polyester and Unsaturated Polyester Resin Composition", which use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/52
Inventor 秦岩赵亮黄志雄梅启林王雁冰黄正群袁露
Owner 江苏大力士云石护理材料有限公司
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