Unsaturated polyester resin for moulding compound and preparation thereof

A polyester resin, unsaturated technology, applied in the field of polymer chemical industry, can solve the problems of limited use, not too wide application surface, long reaction time, etc., to achieve improved corrosion resistance and aging resistance, smoothness, and brittleness. big effect

Inactive Publication Date: 2009-07-22
CHANGZHOU HUARUN COMPOSITE MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the raw materials (mainly from the dibasic acid or dibasic anhydride used), these resins can be divided into isophthalic and orthophthalic types. The dibasic acid used in isophthalic resins is isophthalic acid, and the reaction time is longer. The price of phthalic acid is high, and the current domestic application is not too wide; the ortho-phthalic resin uses phthalic anhydride, the reaction time is moderate, and the price of phthalic anhydride is much lower than that of isophthalic acid , so in China mainly use ortho-phthalic resins, but the difference in qu

Method used

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  • Unsaturated polyester resin for moulding compound and preparation thereof
  • Unsaturated polyester resin for moulding compound and preparation thereof
  • Unsaturated polyester resin for moulding compound and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare a kind of unsaturated polyester resin for molding compound according to following raw material formula and preparation method, formula is:

[0032] Propylene glycol 230g

[0033] Dipropylene glycol 83g

[0034] Methylpropanediol 22g

[0035] Phthalic anhydride 90g

[0036] Maleic anhydride 310g

[0037] Styrene 320g

[0038] Preparation method: (1) Add propylene glycol and phthalic anhydride into a 1000ml four-necked bottle;

[0039] (2) Stir and heat up to effluent, control the temperature of the distillation head not to exceed 103°C, and the reaction temperature not to exceed 190°C until the acid value is 30-40mgKOH / g;

[0040] (3) After cooling down to 160°C, add dipropylene glycol, methylpropanediol and maleic anhydride;

[0041] (4) Continue to heat up, control the distillation head temperature below 103°C, and the reaction temperature below 200°C until the acid value of the reactant is less than 30mgKOH / g, and the viscosity of the polyester is at 650...

Embodiment 2

[0045] The unsaturated polyester resin for molding compound is prepared by the method of embodiment 1, and the specific raw material formula is:

[0046] Propylene glycol 244g

[0047] Dipropylene glycol 74g

[0048] Methylpropanediol 29g

[0049] Phthalic anhydride 88g

[0050] Maleic anhydride 320g

[0051] Styrene 340g

[0052] The unsaturated resin performance detection data that the embodiment of the present invention 1,2 makes is as following table:

[0053]

[0054]

Embodiment 3

[0056] The unsaturated polyester resin for molding compound is prepared by the method of embodiment 1, and the specific raw material formula is:

[0057] Propylene glycol 235g

[0058] Dipropylene glycol 82g

[0059] Methylpropanediol 24g

[0060] Phthalic anhydride 90g

[0061] Maleic anhydride 312g

[0062] Styrene 324g

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Abstract

The invention relates to unsaturated polyester resins and provides an unsaturated polyester resin used for molding compounds. The resin is prepared by dissolving the polymer of propanediol, glycol, dipropylene glycol, phthalandione and maleic anhydride in styrene. The invention has the advantages that: (1) the dipropylene glycol and methyl propanediol are adopted for synthesizing the unsaturated polyester resin to lead the resin to have favorable water resistance and flexibility, besides, the product of the resin has good moisture resistant capacity and excellent mechanical property; (2) when the resin is matched with proper low profile agent for use, the product can reach zero shrinkage, with the precision of size ensured; and (3) the phthalandione can be used for shortening reaction time and reducing energy consumption.

Description

1. Technical field [0001] The invention belongs to the field of macromolecule chemical industry, and in particular relates to unsaturated polyester resin. 2. Technical Background [0002] After decades of development, FRP products have changed from traditional manual production to highly mechanized molding production, and the production efficiency and product quality stability have been greatly improved. Of course, there are also requirements for unsaturated polyester resin. Very demanding. Most of the resins originally used for hand lay-up cannot meet the requirements of molding, such as insufficient reactivity of the resin, excessive shrinkage of the resin after curing, poor compatibility between the resin and the low-shrinkage agent, and so on. So so far, some resin production enterprises or research units have also developed unsaturated resins for different purposes according to the requirements of the molding process. From the raw materials (mainly from the dibasic ac...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08G63/181C08J3/09
Inventor 包柏青李秋萍
Owner CHANGZHOU HUARUN COMPOSITE MATERIALS
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