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Normal-temperature-cured zero-shrinkage unsaturated polyester resin and preparation method thereof

A polyester resin, room temperature curing technology, used in the field of room temperature curing zero shrinkage unsaturated polyester resin and its preparation, can solve the problems of depression, large influence, difficult to achieve single curing and smooth surface, etc., to achieve simple operation process handy effect

Inactive Publication Date: 2011-08-24
上海新天和树脂有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common unsaturated polyester resins on the market have a high shrinkage rate, the volume shrinkage rate of ordinary isophthalic unsaturated resin is 7-10%, the volume shrinkage rate of ortho-phthalic unsaturated resin is 6-9%, dicyclopentadiene The volume shrinkage rate of modified unsaturated resin is 5-7%, and the volume shrinkage rate of epoxy vinyl resin is 3-6%. The larger volume shrinkage rate has a greater impact on FRP products, and it is easy to cause the product to warp. Product problems such as warping, deformation, and dents
[0004] Now there are improved low-shrinkage resins on the market, which are modified by polystyrene, polymethyl methacrylate, LPA, ABS, etc. to reduce the shrinkage of the resin, but most of them are only added as additives to molded products for high-temperature molding. Difficult to achieve single curing and smooth surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The first step: preparation of low shrinkage unsaturated polyester resin:

[0040] Add 690kg of ethylene glycol, 600kg of propylene glycol, 400kg of dipropylene glycol, 1330kg of phthalic anhydride (phthalic anhydride) into the unsaturated polyester resin synthesis equipment with nitrogen protection, stirrer, thermometer, and condensation fractionation device, and heat to 160°C , after keeping the water out, gradually increase the temperature to 185-205°C and keep it warm for 2 hours, the acid value is 25-35mgKOH / g;

[0041] Cool down to 160°C, add 1180kg of maleic anhydride (maleic anhydride), gradually raise the temperature to 202°C, keep the head temperature below 102°C, keep it warm for 2-3 hours, and react until the acid value is 65-75 mgKOH / g;

[0042] Keep the temperature of the material at 195-200°C, keep the vacuum degree ≥ 0.090Mpa, and react under reduced pressure until the acid value drops to 20-40mgKOH / g to obtain unsaturated polyester;

[0043] Cool the f...

Embodiment 2

[0060] The first step: preparation of low shrinkage unsaturated polyester resin:

[0061] Add 1250kg of diethylene glycol, 300kg of propylene glycol, and 1200kg of terephthalic acid into the unsaturated polyester resin synthesis equipment equipped with nitrogen protection, agitator, thermometer, and condensation fractionation device, heat to 180-200°C, keep warm and discharge water, Gradually raise the temperature to 210-230°C, and react until the acid value is 1-10mgKOH / g;

[0062] Cool down to 160°C, add 300kg of maleic anhydride (maleic anhydride) and 900kg of adipic acid, gradually raise the temperature to 202°C, the temperature of the distillation head should not exceed 102°C, keep it warm for 2-3 hours, and react until the acid value is 65-75 mgKOH / g;

[0063] Keep the temperature of the material at 195-200°C, keep the vacuum degree ≥ 0.090Mpa, and react under reduced pressure until the acid value drops to 15-25mgKOH / g to obtain unsaturated polyester;

[0064] Cool the...

Embodiment 3

[0080] The first step: preparation of low shrinkage unsaturated polyester resin:

[0081] Add trimethylolpropane 240kg, propylene glycol 1200kg, neopentyl glycol 365, phthalic anhydride 1195kg in the unsaturated polyester resin synthesis equipment with nitrogen protection, stirrer, thermometer, condensation fractionation device, heat to 160 ~170°C, after heat preservation and water discharge, gradually increase the temperature to 200~210°C, and react until the acid value is 30~50mgKOH / g;

[0082] Cool down to 160°C, add 900kg of maleic anhydride (maleic anhydride) and 300kg of adipic acid, gradually raise the temperature to 202°C, the temperature of the distillation head should not exceed 102°C, keep it warm for 2-3 hours, and react until the acid value is 65-75 mgKOH / g;

[0083] Keep the temperature of the material at 195-200°C, keep the vacuum degree ≥ 0.090Mpa, and react under reduced pressure until the acid value drops to 20-40mgKOH / g to obtain unsaturated polyester;

[...

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Abstract

The invention relates to a normal-temperature-cured zero-shrinkage unsaturated polyester resin and a preparation method thereof. The normal-temperature-cured zero-shrinkage unsaturated polyester resin is prepared by modifying a low-shrinkage unsaturated polyester resin with terminated polyether and liquid epoxy-terminated nitrile-butadiene rubber. The normal-temperature-cured zero-shrinkage unsaturated polyester resin comprises the following components in percentage by weight: 80-90% of low-shrinkage unsaturated polyester resin, 1-11% of terminated polyether dissolved in styrene, 1-10% of liquid epoxy-terminated nitrile-butadiene rubber and 0.5-3% of accelerator. The preparation method comprises the following steps: dissolving the terminated polyether in styrene at 50-80 DEG C for 1-3 hours, evenly mixing at a low speed of 20-200 r / min, adding the terminated polyether dissolved in styrene and the liquid epoxy-terminated nitrile-butadiene rubber into the low-shrinkage unsaturated polyester resin, and evenly mixing to obtain the normal-temperature-cured zero-shrinkage unsaturated polyester resin. The traditional low-shrinkage unsaturated polyester resin, which is modified by the terminated polyether dissolved in styrene and the liquid epoxy-terminated nitrile-butadiene rubber, and further silicon dioxide, can be cured and formed at normal temperature; the volume shrinkage of the normal-temperature-cured zero-shrinkage unsaturated polyester resin is 0.01-0.5%, which is approximate to zero shrinkage; and the operating technique is simple and convenient.

Description

technical field [0001] The invention relates to a room temperature curing zero-shrinkage unsaturated polyester resin and a preparation method thereof, which are mainly used in the fields of glass fiber reinforced plastic molds, sanitary ware, vehicle accessories, yachts and the like. Background technique [0002] At present, unsaturated polyester resin is more and more widely used in the field of FRP, but FRP products have higher and higher requirements on dimensional accuracy, especially in the fields of FRP mold manufacturing, sanitary ware, auto parts, yachts, fan blades and other fields. [0003] Common unsaturated polyester resins on the market have a high shrinkage rate, the volume shrinkage rate of ordinary isophthalic unsaturated resin is 7-10%, the volume shrinkage rate of ortho-phthalic unsaturated resin is 6-9%, dicyclopentadiene The volume shrinkage rate of modified unsaturated resin is 5-7%, and the volume shrinkage rate of epoxy vinyl resin is 3-6%. Larger volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/10C08F291/08C08F291/06C08K13/02C08K3/36
Inventor 马勇林定多
Owner 上海新天和树脂有限公司