Unlock instant, AI-driven research and patent intelligence for your innovation.

Thixotropic resin specially used for manufacturing FRP vehicles and ship shells and preparation method thereof

A technology of FRP and matrix resin, which is applied in the field of thixotropic resin and its preparation, which can solve the problems of high dimensional stability requirements, lower mechanical properties of final products, and unsuitability for manufacturing FRP vehicles and ship shells, so as to ensure dimensional stability properties, reduced shrinkage, and low exothermic peak temperature

Active Publication Date: 2016-06-29
CHANGZHOU TIANMA GROUP CO LTD
View PDF2 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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]

[0028] Table 2

[0029]

[0030] It can be seen from Table 2 that the exothermic peak temperature of the unsaturated polyester resins in each example is relatively low, and the mechanical properties also meet the design requirements, so that a thixotropic resin with a lower shrinkage rate can be further prepared.

（ 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a thixotropic resin specially used for manufacturing FRP vehicles and ship shells and a preparation method thereof. The thixotropic resin is prepared from unsaturated polyester resin, modified low-shrinkage resin, fumed silica and additives The unsaturated polyester resin is made of phthalic anhydride, maleic anhydride, ethylene glycol and propylene glycol in a molar ratio of 2:1:(0.6-0.8):(2.2-2.8). The specific method is: add a modified low-shrinkage resin to the unsaturated polyester resin to obtain a matrix resin; then add the matrix resin, fumed silica and additives to a high-speed dispersing thixotropic kettle and disperse at a high speed until the mixed material It can be obtained when the fineness reaches 30 μm. The thixotropic resin of the present invention has a relatively low line shrinkage rate, does not cause the resin glue to sag when it is constructed on a vertical surface, and is suitable for manufacturing FRP vehicles and ship shells that require high dimensional 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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