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Unsaturated polyester resin for die pressing and preparation method thereof

A polyester resin and unsaturated technology, applied in the field of unsaturated polyester resin for molding and its preparation, can solve the problems of unstable thickening, slow thickening of matrix resin, unstable batch quality of SMC/BMC products, etc. Achieve the effect of stable thickening properties, increased heat distortion temperature, and increased flexural strength

Active Publication Date: 2014-01-29
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

[0005] Although SMC / BMC products have been continuously developed and improved for decades, the batch quality of SMC / BMC products is still unstable. The reason is mainly due to the slow thickening and unstable thickening of the matrix resin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Formula: 2000 parts by weight of phthalic anhydride, 7100 parts by weight of maleic anhydride, 5200 parts by weight of diethylene glycol, 3500 parts by weight of neopentyl glycol, 8000 parts by weight of styrene, 5 parts by weight of hydroquinone, and 3 parts by weight of triphenyl phosphite part, 1 part by weight of copper naphthenate.

[0028] The preparation method of the unsaturated polyester resin for molding is:

[0029] a) When the nitrogen flow rate is 3m 3 Under the condition of / h, neopentyl glycol, diethylene glycol, 2 / 5 weight of polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant are mixed, and the temperature is raised to 80°C, and the heat preservation reaction is carried out for 1 hour. 140°C, heat up to 180°C at a rate of 20°C / h, then rise to 190°C at a rate of 5°C / h, and finally rise to 210°C at a rate of 10°C / h;

[0030] b) Insulate and react at 210°C for 5 hours until the acid value reaches 70mgKOH / g, adjust the nitrogen ...

Embodiment 2

[0034] Formula: 1950 parts by weight of phthalic anhydride, 7200 parts by weight of maleic anhydride, 5100 parts by weight of diethylene glycol, 3300 parts by weight of neopentyl glycol, 8200 parts by weight of styrene, 4 parts by weight of hydroquinone, and 5 parts by weight of triphenyl phosphite parts, 0.8 parts by weight of copper naphthenate.

[0035] The preparation method of the unsaturated polyester resin for molding is:

[0036] a) When the nitrogen flow rate is 3m 3 Under the condition of 1 / h, mix neopentyl glycol, diethylene glycol, 2 / 5 weight of polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant, then heat up to 75°C, keep warm for 1 hour, and the reaction will exotherm to 140°C, heat up to 180°C at a rate of 20°C / h, then rise to 190°C at a rate of 5°C / h, and finally rise to 210°C at a rate of 10°C / h;

[0037] b) Insulate and react at 210°C for 4.5 hours until the acid value reaches 68mgKOH / g, adjust the nitrogen flow rate to 80m 3 / h...

Embodiment 3

[0041] Formula: 2050 parts by weight of phthalic anhydride, 7300 parts by weight of maleic anhydride, 5300 parts by weight of diethylene glycol, 3800 parts by weight of neopentyl glycol, 7800 parts by weight of styrene, 6 parts by weight of hydroquinone, and 4 parts by weight of triphenyl phosphite Parts, 1.3 parts by weight of copper naphthenate.

[0042] The preparation method of the unsaturated polyester resin for molding is:

[0043] a) When the nitrogen flow rate is 4m 3 Under the condition of / h, neopentyl glycol, diethylene glycol, 2 / 5 of the polymerization inhibitor, phthalic anhydride, maleic anhydride and antioxidant are mixed, and the temperature is raised to 80°C, and the reaction is kept for 1.5h, and the reaction is exothermic to 140°C, heat up to 180°C at a rate of 18°C / h, then to 190°C at a rate of 4°C / h, and finally to 210°C at a rate of 9°C / h;

[0044] b) Insulate and react at 210°C for 5.5 hours until the acid value reaches 72mgKOH / g, adjust the nitrogen f...

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PUM

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Abstract

The invention discloses unsaturated polyester resin for die pressing and a preparation method thereof. The resin is mainly prepared from the following components in parts by weight: 1,900-2,100 parts of phthalic anhydride, 7,100-7,300 parts of maleic anhydride, 5,000-5,500 parts of diethylene glycol, 3,000-4,000 parts of neopentyl glycol, 7,500-8,500 parts of styrene, 2-8 parts of a polymerization inhibitor, 1-5 parts of an antioxidant and 0.5-1.5 parts of a retarder. Compared with the prior art, the unsaturated polyester resin for die pressing has the advantages that: the thickening property, thermal deformation temperature and bending strength of the unsaturated polyester resin for die pressing are increased remarkably, and cost is lowered.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an unsaturated polyester resin for molding and a preparation method thereof. Background technique [0002] Unsaturated polyester resin (Unsaturated Polyester Resins, referred to as UPR) is a linear polymer compound with multifunctional groups. It has polyester chain bonds and unsaturated double bonds on its main chain, and each end of the macromolecular chain With carboxyl and hydroxyl. The biggest advantage of using unsaturated polyester resin is that its diluent (styrene) will undergo copolymerization and crosslinking reaction with the double bonds on the main chain when it is finally used, so the solvent volatilization is less during use, so it belongs to the environment. Protection products are often used as substrates in the field of SMC / BMC products. [0003] BMC bulk molding compound (Bulk molding compound), also known as unsaturated polyester glass fiber rei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/01C08G63/676C08K5/526
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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