Lightweight polystyrene foam material with small pore size, and preparation method thereof

A technology of polystyrene foaming and polystyrene, which is applied in the field of polystyrene foaming materials and its preparation, can solve the problems of polystyrene materials such as large pore size, low foaming ratio, and low solubility, and achieve cell diameter Small size, large foaming ratio, and large nucleation density

Inactive Publication Date: 2020-05-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem in the prior art by supercritical CO 2 In the process of foaming polystyrene material, CO 2 In polystyrene, the solubility is low, the diffusion is fast, and the obtained polystyrene material has defects such as large pore size and low expansion ratio, and a polystyrene foam material and its preparation method are provided.

Method used

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  • Lightweight polystyrene foam material with small pore size, and preparation method thereof
  • Lightweight polystyrene foam material with small pore size, and preparation method thereof
  • Lightweight polystyrene foam material with small pore size, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Put the polystyrene raw material and polydimethylsiloxane (the number weight molecular weight is 2000g / mol) into the Harker banbury mixer and blend, the content of polydimethylsiloxane is 1wt%, and the blending temperature is 170 °C, the blending time is 15 min, the torque speed is 100 rpm, and blended to obtain a polystyrene / polydimethylsiloxane blend.

[0056] The blend is placed in an autoclave, and a co-blowing agent absolute ethanol is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, filled with CO 2 The air was replaced three times, and then the autoclave was heated with program temperature control at a heating rate of 10°C / min, heated to a foaming temperature of 110°C, and after holding for half an hour, filled with high-pressure CO 2 , the pressure was controlled at 15 MPa, the blend was saturated for 2 hours, and then the pressure was released rapidly at a rate of 500 MPa / s to obtain a microcellular foamed material.

Embodiment 2

[0058] Put the polystyrene raw material and polydimethylsiloxane (number weight molecular weight is 6000g / mol) into the Harker internal mixer and blend, the content of polydimethylsiloxane is 1wt%, and the blending temperature is 170 °C, the blending time is 15 min, the torque speed is 100 rpm, and blended to obtain a polystyrene / polydimethylsiloxane blend.

[0059] The blend is placed in an autoclave, and a co-blowing agent absolute ethanol is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, filled with CO 2 The air was replaced three times, and then the autoclave was heated with program temperature control at a heating rate of 10°C / min, heated to a foaming temperature of 110°C, and after holding for half an hour, filled with high-pressure CO 2 , the pressure was controlled at 15 MPa, the blend was saturated for 2 hours, and then the pressure was released rapidly at a rate of 500 MPa / s to obtain a microcellular foamed material.

Embodiment 3

[0061] Put the polystyrene raw material and polydimethylsiloxane (the number weight molecular weight is 2000g / mol) into the Harker banbury mixer and blend, the content of polydimethylsiloxane is 1wt%, and the blending temperature is 170 °C, the blending time is 15 min, the torque speed is 100 rpm, and blended to obtain a polystyrene / polydimethylsiloxane blend.

[0062] The blend is placed in an autoclave, and the co-blowing agent n-pentane is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, filled with CO 2 Replace the air three times and then heat the autoclave with programmed temperature control at a heating rate of 10°C / min to a foaming temperature of 110°C. After holding for half an hour, fill it with high-pressure CO 2 , the pressure was controlled at 15 MPa, the blend was saturated for 2 hours, and then the pressure was released rapidly at a rate of 500 MPa / s to obtain a microcellular foamed material.

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Abstract

The invention discloses a preparation method of a polystyrene foam material. The method comprises the following steps: blending polystyrene and polydimethylsiloxane to obtain a polystyrene / polydimethylsiloxane blend; and foaming the polystyrene / polydimethylsiloxane blend under the condition of supercritical CO2 to obtain the polystyrene / polydimethylsiloxane composite material, wherein the number weight molecular weight of the polydimethylsiloxane can be 2000-17000 g / mol. The preparation method is simple in process, free of bad smell and by-products, good in environment friendliness, safe and environmentally friendly in additive and capable of meeting the development requirements of related fields. The polystyrene foam material is high in nucleation density, small in cell diameter, high infoaming ratio and environment-friendly.

Description

technical field [0001] The invention relates to a polystyrene foam material and a preparation method thereof. Background technique [0002] Polystyrene (PS) is an amorphous polymer with extremely high transparency, good electrical insulation, easy processing and low cost. Due to these excellent properties, polystyrene foam products are widely used in food packaging, building insulation, product cushioning and shielding materials and other fields. At present, the main fluorine-containing physical blowing agents in my country's polystyrene foaming industry, such as hydrochlorofluorocarbons (HCFC), hydrofluorocarbons (HFC) and hydrocarbons (HC), because of their solubility in polymers High and slow diffusion in the foaming process, the polystyrene foamed product obtained has a higher ratio. However, because CFCs and HCFCs are harmful to the environment, the foreign foaming industry has turned to use green and environmentally friendly foaming agents for polymer foaming, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L83/04C08J9/12C08J9/00C08J9/14
CPCC08J9/122C08J9/0023C08J9/0061C08J9/141C08J9/127C08J9/142C08J2325/06C08J2483/04C08J2203/12C08J2203/06C08J2203/08C08J2203/14C08J2203/182
Inventor 赵玲强薇胡冬冬刘涛姚舜
Owner EAST CHINA UNIV OF SCI & TECH
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