Resin capable of being thickened at room temperature for sheet molding compound and preparation method thereof

A sheet molding compound, room temperature technology, used in the chemical industry, can solve the problem of inability to thicken quickly, achieve excellent surface finish, excellent electrical properties and surface finish, and improve the effect of crystallinity

Active Publication Date: 2014-05-07
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

The resin can reduce the curing time of the sheet molding compound and solve the problem of rapid thickening without ovens and drying rooms, thereby improving the production efficiency of the sheet molding compound and stabilizing its product quality

Method used

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  • Resin capable of being thickened at room temperature for sheet molding compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Formula: oxalic acid: 300 parts by weight, maleic anhydride: 1000 parts by weight, 1,2-propanediol: 500 parts by weight, diethylene glycol: 680 parts by weight, styrene: 1000 parts by weight, triphenyl phosphite: 0.5 parts by weight , hydroquinone: 0.5 parts by weight, methylhydroquinone: 1 part by weight, tert-butylhydroquinone: 1 part by weight.

[0035] The preparation method of this unsaturated polyester resin is:

[0036] a) When the nitrogen flow rate is 2~4m 3 Under the condition of 1,2-propanediol, diethylene glycol, 1 / 2 weight of high-temperature polymerization inhibitor, oxalic acid, maleic anhydride and antioxidant, the temperature is raised to 75-80°C, and the heat preservation reaction is 1-1.5 After one hour, the heat is released to 140°C, and the temperature is raised to 180°C at a rate of 20°C / h, then to 190°C at a rate of 5°C / h, and finally to 210°C at a rate of 10°C / h;

[0037] b) Insulate and react at 210°C for 4.5-5.5 hours, the acid value of the m...

Embodiment 2

[0041] Formula: oxalic acid: 250 parts by weight, maleic anhydride: 1050 parts by weight, 1,2-propanediol: 450 parts by weight, diethylene glycol: 700 parts by weight, styrene: 1050 parts by weight, triphenyl phosphite: 0.6 parts by weight , hydroquinone: 0.6 parts by weight, methylhydroquinone: 0.8 parts by weight, tert-butylhydroquinone: 0.8 parts by weight.

[0042] The preparation method of this unsaturated polyester resin is:

[0043] a) When the nitrogen flow rate is 2 ~ 4m 3 Under the condition of 1,2-propanediol, diethylene glycol, 1 / 2 high-temperature polymerization inhibitor, oxalic acid, maleic anhydride and antioxidant, mix and heat up to 75-80°C, and keep warm for 1-1.5h Afterwards, release heat 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;

[0044] b) Insulate and react at 210°C for 4.5-5.5 hours, the acid value of the material reaches 68-72mgKOH / g, adjust the nitrogen flow ...

Embodiment 3

[0047] Formula: oxalic acid: 200 parts by weight, maleic anhydride: 1000 parts by weight, 1,2-propanediol: 550 parts by weight, diethylene glycol: 650 parts by weight, styrene: 1000 parts by weight, triphenyl phosphite: 0.4 parts by weight , hydroquinone: 0.4 parts by weight, methylhydroquinone: 1.2 parts by weight, tert-butylhydroquinone: 1.2 parts by weight.

[0048] The preparation method of this unsaturated polyester resin is:

[0049] a) When the nitrogen flow rate is 2 ~ 4m 3 Under the condition of 1,2-propanediol, diethylene glycol, 1 / 2 high-temperature polymerization inhibitor, oxalic acid, maleic anhydride and antioxidant, mix and heat up to 75-80°C, and keep warm for 1-1.5h Afterwards, release heat 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;

[0050] b) Insulate and react at 210°C for 4.5-5.5 hours, the acid value of the material reaches 68-72mgKOH / g, adjust the nitrogen flow ...

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Abstract

The invention discloses resin capable of being thickened at room temperature for a sheet molding compound and a preparation method thereof. The resin is mainly prepared by the following components in parts by weight: 200-300 parts of oxalic acid, 1000-1200 parts of maleic anhydride, 400-600 parts of propylene glycol, 600-750 parts of diethylene glycol, 950-1050 parts of styrene, 0.2-0.8 part of antioxidant, 0.2-0.8 part of high temperature polymerization inhibitor, 0.5-1.5 parts of normal temperature polymerization inhibitor, and 0.5-1.5 parts of retarding agent. Compared with the prior art, the resin can be rapidly thickened at room temperature to reach the viscosity required by the pressing technology, and can also be rapidly thickened at low room temperature in winter, so that the production efficiency of sheet molding compounds is improved, and the quality of the product is stabilized.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a resin for sheet molding compound capable of thickening at room temperature 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] Composite materials, like other traditional materials, can be furth...

Claims

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Application Information

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