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Unsaturated polyester resin for sheet or bulk molding compound and preparation method thereof

A mass molding compound and polyester resin technology, which is applied in the field of polymer material preparation, can solve the problems of high requirements on weather resistance and the inability of resin to meet the surface finish of molded products, and achieves high structural regularity, high finish and heat resistance. The effect of increasing the brightness and brightness of the surface

Active Publication Date: 2011-05-18
CHANGZHOU HUAKE POLYMERS
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Problems solved by technology

[0006] In order to overcome the shortcomings that the existing resins cannot meet the surface finish of molded products and require high weather resistance, the invention provides an unsaturated polyester resin for sheet or bulk molding compound and its preparation method

Method used

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  • Unsaturated polyester resin for sheet or bulk molding compound and preparation method thereof
  • Unsaturated polyester resin for sheet or bulk molding compound and preparation method thereof
  • Unsaturated polyester resin for sheet or bulk molding compound and preparation method thereof

Examples

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preparation example Construction

[0017] A preparation method of unsaturated polyester resin for sheet or bulk molding compound, comprising the following steps: putting propylene glycol, neopentyl glycol, maleic anhydride and fumaric acid into a device with heating and stirring in proportion, and feeding Under nitrogen protection, stir and heat up to effluent, control the temperature of the distillation head at 95-105°C and the reaction temperature at 180-190°C until the acid value is 70-80 mg KOH / g, increase the reaction temperature to 190-210°C until the acid value is less than 30 mg After KOH / g, cool down to 150°C, pour into a solution containing styrene and a polymerization inhibitor for dilution, and keep the dilution temperature at 60-80°C.

[0018] The inventor obtained a kind of unsaturated polyester resin for sheet / bulk molding compound (SMC / BMC) with high brightness and excellent weather resistance and its preparation method by improving the synthesis process and formula. The activity of the product a...

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Abstract

The invention relates to the technical field of preparation of high molecular materials, in particular to a preparation method of an unsaturated polyester resin for a sheet or bulk molding compound. The unsaturated polyester resin is prepared by performing esterification on small molecular dibasic alcohol, unsaturated dibasic acid or acid anhydride and dissolving polymer which is formed by polycondensation in inhibitor-containing styrene. The preparation method of the unsaturated polyester resin comprises the following steps of: putting propylene glycol, dineopentyl alcohol, maleic anhydride and fumaric acid into a heating and stirring device in proportion; introducing nitrogen gas for protection; stirring, heating and discharging water; controlling a fraction head temperature and a reaction temperature until acid value is 70 to 80mgKOH / g; increasing the reaction temperature until the acid value is less than 30mgKOH / g and cooling to 150 DEG C; pouring into solution containing styrene and an inhibitor for dilution; and keeping a dilution temperature at 60 to 80 DEG C. The unsaturated polyester resin has high reaction activity, and a molding compound product has extremely excellent advantages of high surface glossiness, high heat resistance, high weather resistance, high water resistance, high acid resistance, high alkali resistance and the like.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to an unsaturated polyester resin for sheet or bulk molding compound and a preparation method thereof. Background technique [0002] Unsaturated polyester resin is the most commonly used type of thermosetting resin. It is a linear polymer formed by polycondensation of saturated dibasic acid, unsaturated dibasic acid and dibasic alcohol. It is formed by diluting cross-linking monomers or active solvents. A resin solution with a certain viscosity. It is one of the most widely used types of thermosetting resin and FRP composite products. It is widely used because of its simple production process and excellent mechanical, electrical, and corrosion resistance properties of the product. [0003] In recent years, with the continuous development of technology, many FRP preparation methods that are different from traditional processes have made great progress, such as h...

Claims

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Application Information

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IPC IPC(8): C08G63/52C08G63/78
Inventor 钱永嘉
Owner CHANGZHOU HUAKE POLYMERS
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