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Special thixotropic resin for manufacturing glass fiber reinforced plastic (FRP) vehicles and ship hulls, and preparation method thereof

A glass fiber reinforced plastic and matrix resin technology, which is applied in the field of thixotropic resin and its preparation, can solve the problems of high dimensional stability requirements, reduced mechanical properties of final products, unsuitable for manufacturing glass fiber reinforced plastic vehicles and ship shells, etc., to ensure dimensional stability. properties, shrinkage reduction, and low exothermic peak temperature

Active Publication Date: 2014-01-08
CHANGZHOU TIANMA GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when the existing unsaturated polyester resin is cured, the exothermic peak temperature is above 170°C, and after exothermic action, the product will shrink when cooling, and the higher the exothermic peak temperature, the higher the shrinkage rate. FRP vehicle and ship shells require high dimensional stability of the product, therefore, the existing unsaturated polyester resin is not suitable for manufacturing FRP vehicle and ship shells
[0004] In addition, the existing methods to reduce shrinkage are usually to add low shrinkage agents, and the addition of low shrinkage agents will reduce the mechanical properties of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] (Example 1, unsaturated polyester resin and preparation method thereof)

[0021] The unsaturated polyester resin in this example is composed of phthalic anhydride (abbreviated as PA, the same below), maleic anhydride (abbreviated as MA, the same below), ethylene glycol (abbreviated as EG, the same below) and propylene glycol (abbreviated as PG). , the same below) according to the molar ratio of 2:1:0.6:2.8.

[0022] The specific preparation method is as follows: add PA, MA, EG and PG into the reactor according to the above molar ratio, first raise the temperature to 160°C and react slowly for 0.5h, and then slowly raise the temperature to 205°C-210°C for heat preservation reaction. When the Gardner bubble viscosity of the material in the reactor reaches U-V and the acid value reaches 23mgKOH / g (the reaction time in this embodiment is about 12h), the reaction is stopped to obtain a polycondensate. Pump the above-mentioned polycondensate into the dilution tank that has b...

example 2～ example 3）

[0025] Each example is basically the same as Example 1, and the differences are shown in Table 1 and Table 2.

[0026] Table 1

[0027] Example 1 Example 2 Example 3 PA:MA:EG:PG (molar ratio) 2∶1∶0.6∶2.8 2∶1∶0.7∶2.7 2∶1∶0.8∶2.6 Gardner Bubble Viscosity U~V U~V U~V Acid value mgKOH / g 23 22 22

[0028] Table 2

[0029] Test Methods Index range Example 1 Example 2 Example 3 Exterior GB / T8237.4.1.1 light yellow transparent liquid light yellow transparent liquid light yellow transparent liquid light yellow transparent liquid Viscosity Pa·s GB / T7193.1 0.45～0.70 0.64 0.63 0.63 Gel time min GB / T7193.6 18～36 23 24 23 Acid value mgKOH / g GB / T2895 20～25 23 24 24 Solid content% GB / T7193.3 62.0～68.0 66.3 65.8 65.6 Barco hardness GB / T3854 ≥35 39 40 42 Heat distortion temperature ℃ GB / T1634 ≥60 65 61 64 Bending strength MPa GB / T2570 ≥100 ...

（ example 4

[0031] (Example 4, isophthalic unsaturated polyester resin and preparation method thereof)

[0032] The isophthalic unsaturated polyester resin of this example is prepared from isophthalic acid, maleic anhydride, adipic acid and diethylene glycol in a molar ratio of 2:1.5:1:4.75.

[0033] The specific preparation method is as follows: add isophthalic acid, maleic anhydride, adipic acid and diethylene glycol into the reaction kettle according to the above molar ratio, first raise the temperature to 160°C and react slowly for 0.5h, then slowly raise the temperature To 215 ℃ ~ 220 ℃ heat preservation reaction. When the Gardner bubble viscosity of the material in the reactor reaches 0~Q and the acid value reaches 14 mgKOH / g (the reaction time in this embodiment is about 15 hours), the reaction is stopped to obtain a polycondensate. Pump the above-mentioned polycondensate into the dilution tank that has been added with styrene (the weight ratio of polycondensate to styrene is 65:3...

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Abstract

The invention discloses special thixotropic resin for manufacturing glass fiber reinforced plastic (FRP) vehicles and ship hulls, and a preparation method thereof. The thixotropic resin is prepared by unsaturated polyester resin, modified low-shrinkage resin, fumed silica and additives, wherein the unsaturated polyester resin is prepared by phthalic anhydride, maleic anhydride, ethylene glycol and propylene glycol according to the mole ratio of 2:1:(0.6-0.8):(2.2-2.8). The method specifically comprises the steps of adding modified low-shrinkage resin into the unsaturated polyester resin to obtain matrix resin; then sequentially adding the matrix resin and fumed silica and additives into a thixotropic kettle dispersing at high speed for dispersing at high speed until the fineness of the mixed material reaches 30mu m, thus obtaining the thixotropic resin. The thixotropic resin is lower in linear shrinkage, incapable of having running phenomenon of resin glue liquid in construction on a perpendicular surface, and suitable for manufacturing the glass fiber reinforced plastic (FRP) vehicles and ship hulls, which have higher requirement for dimension stability.

Description

technical field [0001] The invention relates to a thixotropic resin and a preparation method thereof, in particular to a thixotropic resin specially used for manufacturing FRP vehicle and ship shells and a preparation method thereof. Background technique [0002] With the rapid development of the domestic automobile industry, FRP box panels for vehicles and ships have been widely used. However, in the process of hand lay-up or spray molding FRP vehicle and ship shells, the resin is required to have strong adhesion and shrinkage. The rate is low, and there is no flow of glue in the vertical surface construction. [0003] At present, when the existing unsaturated polyester resin is cured, the exothermic peak temperature is above 170°C, and after exothermic action, the product will shrink when cooling, and the higher the exothermic peak temperature, the higher the shrinkage rate. FRP vehicle and ship shells have higher requirements on the dimensional stability of the product, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08K3/36C08G63/52C08G63/676
Inventor 徐大云秦录平陆震信
Owner CHANGZHOU TIANMA GROUP CO LTD
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