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

Use of functionalized polyvinyl esters for increasing the surface tension of BMC/SMC parts

A polyvinyl ester and polyvinyl acetate technology, applied in the field of increasing the surface tension of BMC/SMC moldings, can solve the problems of volume shrinkage and insufficient adhesion of the paint layer

Inactive Publication Date: 2009-05-06
WACKER CHEM GMBH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A problem in processing these polyester resin compositions (fiber reinforced plastic composites = FPR composites) is that the volume shrinks when the polyester resins are cured at elevated temperatures
The disadvantage here is that the surfaces of the moldings obtained using the described technology have only low surface tension, with the result that the adhesion of the paint layer is insufficient

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

Embodiment Construction

[0019] The following examples are used to further illustrate the present invention:

[0020] The following SMC formulations were tested:

[0021] components

Embodiment 1 of the present invention

(pts. weight) Comparative example 1

(pts. weight) Phthalate UP resin (65% by weight in styrene) 65.5 65.5 Polyvinyl acetate (40% by weight in styrene) 30.0 30.0 VAc-CA copolymer (40% by weight in styrene) 10.0 Styrene 4.5 4.5 tert-butyl perbenzoate 1.5 1.5 Zinc stearate 4.0 4.0 carbon black pigment 10.0 10.0 calcium carbonate 200.0 200.0 Benzoquinone 0.3 0.3 Processing Additives (Wetting Agents, Degassers) 7.9 7.9 magnesium oxide 2.5 2.5 glass fiber 90.0 90.0

[0022] VAc-CA copolymer = vinyl acetate-crotonic acid copolymer with 5% by weight crotonic acid

[0023] The formulations were processed as follows to give SMC moldings:

[0024] Except for magnesium o...

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

No PUM Login to View More

Abstract

The invention relates to a use of functionalized solid polyvinyl acetate resin as additive in unsaturated polyester resin composition for improving surface tension of the mould obtained.

Description

technical field [0001] The present invention relates to the use of functionalized polyvinyl esters for increasing the surface tension of BMC / SMC moldings. Background technique [0002] The manufacture of sheet-like plastic parts generally uses unsaturated polyester resin compositions (UP resins). These polyester resins are reaction products of dicarboxylic acids or dicarboxylic anhydrides with polyols. These polyester resin compositions also contain monomers having ethylenically unsaturated groups, typically styrene. Styrene is added to the polyester resin composition in order to dissolve the polyester and ensure that the polyester composition is a flowable material. Fibrous materials, such as glass fibers, carbon fibers or corresponding fiber mats, are also present in the polyester resin composition in order to reinforce the plastic parts obtained using the polyester resin composition. [0003] A problem with processing these polyester resin compositions (fibre-reinforce...

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 Applications(China)
IPC IPC(8): C08F218/00C08L67/00
CPCC08L31/02C08L67/06C08L2666/04
Inventor R·格雷韦
Owner WACKER CHEM GMBH