Unsaturated polyester resin used for bulk molding compound and preparation method thereof

A technology of bulk molding compound and polyester resin, applied in the chemical industry, can solve the problems of high cost, limited industrial application, insufficient mechanical properties, etc., and achieve the effect of cost reduction

Active Publication Date: 2015-09-23
宜兴市兴合树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although BMC products have been continuously developed and improved for decades, the cost of BMC products is high, and some researches try to reduce the cost, but it will lead to insufficient mechanical properties, which seriously limits its industrial application.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Formula: 2000 parts by weight of phthalic anhydride, 7500 parts by weight of maleic anhydride, 3700 parts by weight of diethylene glycol, 4500 parts by weight of 1,2-propanediol, 3 parts by weight of triphenyl phosphite, 8 parts by weight of hydroquinone, methyl hydrogen 7 parts by weight of quinone, 8500 parts by weight of styrene, and 1 part by weight of p-benzoquinone.

[0025] The preparation method of the unsaturated polyester resin for bulk molding compound is:

[0026] a) When the nitrogen flow rate is 1.5 ~ 1.8m 3 Under the condition of 1,2 propylene glycol, diethylene glycol, 3 / 5 polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant, the temperature is raised to 205°C at a rate of 10-12°C / h, and the temperature is kept React for 5-8 hours, react until the acid value reaches 39-45mgKOH / g, carry out dehydration under reduced pressure until the acid value reaches 31-37mgKOH / g, then cool to 195°C, add the remaining polymerization inhibitor...

Embodiment 2

[0030] Formula: 2200 parts by weight of phthalic anhydride, 8000 parts by weight of maleic anhydride, 3500 parts by weight of diethylene glycol,

[0031] 4800 parts by weight of 1,2-propanediol, 3 parts by weight of triphenyl phosphite, 10 parts by weight of hydroquinone, 5 parts by weight of methylhydroquinone, 8800 parts by weight of styrene, and 1 part by weight of p-benzoquinone.

[0032] The preparation method of the unsaturated polyester resin for bulk molding compound is:

[0033] a) When the nitrogen flow rate is 1.5 ~ 1.8m 3 Under the condition of 1,2 propylene glycol, diethylene glycol, 3 / 5 polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant, the temperature is raised to 205°C at a rate of 10-12°C / h, and the temperature is kept React for 5-8 hours, react until the acid value reaches 39-45mgKOH / g, carry out dehydration under reduced pressure until the acid value reaches 31-37mgKOH / g, then cool to 195°C, add the remaining polymerization inhi...

Embodiment 3

[0037] Formula: 2500 parts by weight of phthalic anhydride, 7500 parts by weight of maleic anhydride, 3700 parts by weight of diethylene glycol,

[0038] 4500 parts by weight of 1,2-propanediol, 4 parts by weight of triphenyl phosphite, 8 parts by weight of hydroquinone, 7 parts by weight of methylhydroquinone, 8500 parts by weight of styrene, and 1.5 parts by weight of p-benzoquinone.

[0039] The preparation method of the unsaturated polyester resin for bulk molding compound is:

[0040] a) When the nitrogen flow rate is 1.5 ~ 1.8m 3 Under the condition of 1,2 propylene glycol, diethylene glycol, 3 / 5 polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant, the temperature is raised to 205°C at a rate of 10-12°C / h, and the temperature is kept React for 5-8 hours, react until the acid value reaches 39-45mgKOH / g, carry out dehydration under reduced pressure until the acid value reaches 31-37mgKOH / g, then cool to 195°C, add the remaining polymerization in...

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Abstract

The invention discloses unsaturated polyester resin used for a bulk molding compound and a preparation method thereof. The resin is mainly prepared from the following raw materials by weight: 2000 to 2500 parts of phthalic anhydride, 7500 to 8500 parts of maleic anhydride, 3500 to 4000 parts of diethylene glycol, 4500 to 5000 parts of 1,2-propylene glycol, 3 to 5 parts of an antioxidant, 8 to 12 parts of a polymerization inhibitor, 3 to 7 parts of methylhydroquinone, 8500 to 9000 parts of styrene and 1 to 2 parts of p-benzoquinone. Compared with the prior art, the unsaturated polyester resin for the bulk molding compound provided by the invention has the following advantages: cost is significantly reduced, and excellent mechanical property is maintained.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an unsaturated polyester resin for bulk molding compound and a preparation method thereof. Background technique [0002] BMC (DMC) material is the abbreviation of Bulk (Dough) molding compounds, that is, bulk molding compound. It is often called unsaturated polyester bulk molding compound in China. Its main raw materials are GF (chopped glass fiber), UP (unsaturated resin), MD (filler) and various additives that are fully mixed into a dough-like prepreg. DMC materials were first applied in the former West Germany and the United Kingdom in the 1960s, and then developed in the United States and Japan in the 1970s and 1980s. Because BMC bulk molding compound has excellent electrical properties, mechanical properties, heat resistance, chemical corrosion resistance, and adapts to various molding processes, it can meet the performance requirements of various products, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08F212/08C08G63/676C08K5/526
Inventor 韩立春潘伯祥陈彬彬
Owner 宜兴市兴合树脂有限公司
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