Method for preparing polystyrol thick sheet material

A polystyrene and plate technology, applied in the field of plastic molding processing, can solve the problems that it is difficult to meet the technical requirements of large-scale dielectric lens materials, and achieve the effects of high thermal deformation temperature, small melt index, and reduced product performance

Active Publication Date: 2011-06-22
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] According to the above analysis, it is difficult for the above forming process to meet the technical requirements of large dielectric lens materials for polystyrene sheets, so we must find a new type of sheet forming process to meet the technical requirements of large dielectric lens materials for polystyrene sheets

Method used

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  • Method for preparing polystyrol thick sheet material

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Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, the preparation process of the thick polystyrene plate of the present embodiment is as follows:

[0041] Use heat-resistant polystyrene resin as raw material (MFR is 2.2g / 10min, its heat distortion temperature reaches 86°C, softening point reaches 104°C, and tensile strength reaches 54MPa), first dry it for use at 80°C, time more than 6 hours.

[0042] Then put the resin into the gradient single-screw extruder. The temperature of each section of the extruder is controlled at 140, 165, and 155°C respectively, the extrusion pressure is 7±1MPa, and the material is supplied to the mold at a screw speed of 60 rpm. The mold system The temperature is 100±10°C. When the material in the mold is full, the extruder stops, the extruder and the mold system are disconnected, and the mold inlet is closed.

[0043] The press applies pressure to the plate, and under the pressure of 10MPa, the segmental isotherm descends for cooling and shaping. Incubate at ...

Embodiment 2

[0046] Such as figure 1 As shown, the preparation process of the thick polystyrene plate of the present embodiment is as follows:

[0047] Use heat-resistant polystyrene resin as raw material (model: GP-303, MFR is 2.1g / 10min, its heat distortion temperature reaches 88°C, softening point reaches 105°C, and tensile strength reaches 53MPa), first dry it for use , the temperature is 80°C, and the time is more than 6 hours.

[0048] Then put the resin into the gradient single-screw extruder. The temperature of each section of the extruder is controlled at 145, 160, and 150°C respectively, the extrusion pressure is 10±1MPa, and the material is fed into the mold at a screw speed of 80 rpm. The mold system The temperature is 95±10°C. When the material in the mold is full, the extruder stops, the extruder and the mold system are disconnected, and the mold inlet is closed.

[0049] The press applies pressure to the plate, and under the pressure of 8MPa, the segmental isotherm descend...

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Abstract

The invention provides a method for preparing a thick polystyrene board, which comprises the following steps: firstly extruding and plasticizing heat-resistant polystyrene resin by an extruder at a temperature of between 140 and 165 DEG C; then feeding the polystyrene resin into a die cavity of a die at the pressure of 6 to 12MPa; and finally pressing and forming the thick polystyrene board in the die cavity of the die. The method adopts processes of extruding, pressing and forming to form the thick polystyrene board, is favorable for discharge of volatile components in a plastic fused body, and avoids a molecular chain segment of a high polymer generating chain scission reaction because the plastic fused body is in a high temperature state for a long time to reduce product performance. The preparation method can produce an extra thick polystyrene plastic board of a large-sized medium lens material.

Description

technical field [0001] The invention relates to a method for preparing thick polystyrene plates, which belongs to the field of plastic molding processing. Background technique [0002] Polystyrene plastic is a colorless, transparent beaded or granular amorphous thermoplastic resin, colorless, tasteless, odorless, with a relative density of 1.05, used at 60-75°C and under low load, and has high rigidity and surface hardness And gloss, good dimensional stability, good coloring, surface decoration, radiation resistance, good electrical properties, especially good high-frequency insulation performance, good arc resistance. Polystyrene has good molding processability, and can be formed by injection, extrusion molding, blow molding, foaming, thermoforming, bonding, coating, welding, machining, printing and other processing methods. Widely used in electrical, instrumentation, optical lenses, electric frequency electrical insulating films, high frequency insulating materials, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/34B29C43/58B29C47/92B29K25/00B29L7/00B29C48/92
CPCB29C48/92B29C48/397B29C2948/92514B29C2948/92704B29C2948/92895B29C2948/92904
Inventor 温汉东熊泽林陈明炜
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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