Sheet molding compound free of magnesium oxide thickening and preparation method thereof

A sheet molding compound, magnesium oxide-free technology, applied in flat products, other household appliances, applications, etc., can solve the problems of poor thickening stability and unstable product quality, achieve high cross-linking density and avoid thickening. Effects of stability issues, good creep and fatigue resistance

Inactive Publication Date: 2018-10-12
JIANGSU ZHAOJUN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to overcome the problems of poor thickening stability and unstable product quality of the prepared sheet molding compound existing in the prior art, the present invention proposes a method that effectively improves the thickening stability and effectively improves the product quality stability. Controlled magnesium oxide-free thickened sheet molding compound and method for preparing same

Method used

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  • Sheet molding compound free of magnesium oxide thickening and preparation method thereof
  • Sheet molding compound free of magnesium oxide thickening and preparation method thereof
  • Sheet molding compound free of magnesium oxide thickening and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A magnesium oxide-free thickening sheet molding compound, free of magnesium oxide thickener, added with a polyurethane-modified vinyl resin, and specifically calculated in weight fraction, including the following preparation raw materials: 65 parts of polyurethane-modified vinyl resin, carbon fiber 105 parts, 35 parts of low shrinkage agent PS, 160 parts of calcium carbonate with a particle size of 2 μm, 1 part of 1,1-bis-(tert-amyl peroxide) cyclohexane, 4 parts of mold release agent 7565; the carbon fiber is polypropylene The nitrile-based carbon fiber and the viscose-based carbon fiber are composed of a mass ratio of 2:1;

[0023] The preparation method of the above-mentioned magnesium oxide-free thickening sheet molding compound, the steps are as follows:

[0024] (1) firstly prepare the required preparation raw materials by weight;

[0025] (2) Preparation of resin paste: Add polyurethane modified vinyl resin, low shrinkage agent, curing agent, inorganic mineral f...

Embodiment 2

[0028] A magnesium oxide-free thickening sheet molding compound, free of magnesium oxide thickener, added with a polyurethane-modified vinyl resin, specifically calculated by weight fraction, including the following preparation raw materials: 95 parts of polyurethane-modified vinyl resin, carbon fiber 65 parts, 45 parts of low shrinkage agent PMMA, 220 parts of calcium carbonate with a particle size of 2.05 μm, 2 parts of 1,1-bis-(tert-amyl peroxide) cyclohexane, and 8 parts of mold release agent 7565; Acrylonitrile-based carbon fiber and viscose-based carbon fiber are composed of a mass ratio of 2:1;

[0029] The preparation method of the above-mentioned magnesium oxide-free thickening sheet molding compound, the steps are as follows:

[0030] (1) firstly prepare the required preparation raw materials by weight;

[0031] (2) Preparation of resin paste: Add polyurethane modified vinyl resin, low shrinkage agent, curing agent, inorganic mineral filler and mold release agent in...

Embodiment 3

[0034]A magnesium oxide-free thickening sheet molding compound, free of magnesium oxide thickener, added with a polyurethane-modified vinyl resin, specifically calculated by weight fraction, including the following preparation raw materials: 85 parts of polyurethane-modified vinyl resin, carbon fiber 135 parts, 40 parts of low shrinkage agent PVAc, 130 parts of calcium carbonate with a particle size of 1.95 μm, 1.5 parts of 1,1-bis-(tert-amyl peroxide) cyclohexane, 6 parts of mold release agent 7565; the carbon fiber is polypropylene The nitrile-based carbon fiber and the viscose-based carbon fiber are composed of a mass ratio of 2:1;

[0035] The preparation method of the above-mentioned magnesium oxide-free thickening sheet molding compound, the steps are as follows:

[0036] (1) firstly prepare the required preparation raw materials by weight;

[0037] (2) Preparation of resin paste: Add polyurethane modified vinyl resin, low shrinkage agent, curing agent, inorganic minera...

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Abstract

The invention discloses a sheet molding compound free of magnesium oxide thickening and a preparation method thereof. Application of a magnesium oxide thickening agent is avoided, polyurethane modified vinyl resin is added and used as matrix resin, and in cooperation with other components including reinforcement fibers, a low-shrink additive, inorganic mineral filler, a curing agent and a mould release agent, by selecting the optimal preparation method and technological parameters, the sheet molding compound is prepared; the problem of unstable thickening of the magnesium oxide powder thickening agent during use is solved, polyurethane modified vinyl resin can bear higher impact force compared with common unsaturated resin and has good creep resistance and fatigue resistance, the product quality and performance of the sheet molding compound are improved, the sheet molding compound can be more widely applied to the fields such as manufacturing of industrial pump valves, automobile battery boxes and seats, and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a magnesium oxide-free thickening sheet molding compound and a preparation method thereof. Background technique [0002] Sheet molding compounds (SMC for short) are mainly composed of GF (special yarn), UP (unsaturated resin), LPA (low shrinkage additive), MD (filler) and various additives. SMC composite materials and their SMC molded products have excellent electrical insulation properties, mechanical properties, thermal stability, and chemical corrosion resistance. Therefore, the application range of SMC products is quite extensive. [0003] However, high-performance SMC sheets have high requirements for the thickening of resin paste, not only the speed is fast, but also the thickening stability of each batch of SMC materials is better, while the commonly used thickener magnesium oxide powder is added in the process of adding resin paste. The addition met...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08L75/04C08L101/00C08L31/04C08L25/06C08L33/12C08K13/04C08K7/06C08K3/26C08K5/14B29D7/01
CPCC08L75/04B29D7/01C08K2003/265C08L101/00C08L31/04C08L25/06C08L33/12C08K13/04C08K7/06C08K3/26C08K5/14
Inventor鲁平才秦超
OwnerJIANGSU ZHAOJUN NEW MATERIAL CO LTD