Technique and equipment for fabricating plastic sheet material produced from molding laminar die in low pressure

A sheet molding compound and low pressure molding technology, applied in the field of low pressure molding sheet molding compound sheet and its production process and equipment, can solve the problem of clogging scraper and PE film, uneven distribution, affecting the effect of resin paste on fiber impregnation, etc. problems, to reduce the requirements, overcome the high molding temperature and pressure, and improve the temperature and pressure conditions

Inactive Publication Date: 2006-04-19
山东海博新材料有限公司
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  • Abstract
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Problems solved by technology

The crystalline resin recrystallized into a solid state is unevenly distributed in the resin paste, forming hard lumps, which will seriously affect the impregnation effect of the resin paste on the fibers when producing sheets.
In addition, the uneven hard group crystalline resin is easy to adhere to the scraper of the sheet machine, blocking the gap between the scraper and the PE film, and affecting the continuous production of the sheet

Method used

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  • Technique and equipment for fabricating plastic sheet material produced from molding laminar die in low pressure

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0016] 1. Low pressure forming sheet molding compound sheet

[0017] Prepared from the following raw materials in parts by mass:

[0018] 50-80 parts of unsaturated polyester resin, 5-20 parts of crystalline resin, 20-50 parts of low shrinkage additive, 0.8-1.2 parts of initiator, 0.5-1 part of polymerization inhibitor, 2-4 parts of internal mold release agent, 80-200 parts of filler, chopped glass fiber accounts for 20%-35% of the total mass of the sheet.

[0019] Among the above-mentioned raw materials, the unsaturated polyester resin can adopt No. 191 unsaturated polyester resin. The crystalline resin can be self-made crystalline resin with a melting point of 65 degrees, and its function is to play the role of physical thickening. The low-shrinkage additive can use thermoplastic resins such as polystyrene and polyvinyl acetate, and its function is...

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Abstract

A plastic sheet able to be shaped by low-pressure moulding is proportionally prepared from unsaturated polyester resin, crystalline resin, low-shrinkage additive, trigger, polymerizing inhibitor, internal demoulding agent, filler and short glass fibers through mixing, thickening, shaping and packing. It can be moulded at 80-120 deg.C under 1-3 MPa for 2-3 hr.

Description

technical field [0001] The invention relates to a low-pressure molding sheet molding compound sheet and its production process and equipment. Background technique [0002] At present, with the continuous expansion of industrialization and automated production scale, the production of low-pressure molding sheet molding compound (hereinafter referred to as low-pressure SMC) sheets in the polyester molding compound market is becoming more and more popular, and its status is becoming more and more important. However, due to the high molding pressure of 3.5-7.0 MPa in the production process of traditional SMC, it is necessary to invest a lot of money to purchase expensive production molding equipment; energy, resulting in relatively high production costs. [0003] If crystalline resin is used as a low-pressure SMC thickener, the molding pressure is 1.0-3.0MPa, and the molding temperature is 80-120°C. In this way, the above disadvantages can be overcome in terms of equipment and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/06C08J5/18B29C70/30
Inventor 黄志雄张凯秦岩梅启林李建于浩付承菊王雁冰
Owner 山东海博新材料有限公司
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