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Preparation method for polycarbonate microcellular foaming material

A microcellular foaming material and polycarbonate technology are applied in the field of preparing polycarbonate microcellular foaming materials by using supercritical fluid technology, and can solve the problems of increased cell diameter, cell collapse, increased stress concentration and the like, Achieve the effect of improving foaming efficiency, good pore size uniformity, and shortening saturation time

Inactive Publication Date: 2018-02-09
宁波致微新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing foaming technology is prepared by adding a foaming aid in the mill and placing a certain pressure on a constant temperature molding machine to prepare the microcellular foaming method. The prepared PC parts are likely to cause cell collapse and cause The increase in the cell diameter increases the stress concentration, and the chance of cracking increases greatly.

Method used

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  • Preparation method for polycarbonate microcellular foaming material
  • Preparation method for polycarbonate microcellular foaming material
  • Preparation method for polycarbonate microcellular foaming material

Examples

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preparation example Construction

[0020] The preparation method of the polycarbonate microcellular foam material of the present invention comprises step 1, step 2 and step 3;

[0021] Step 1: Place the polycarbonate material in the pressure vessel A, seal the pressure vessel A, raise the temperature to the infiltration temperature, the infiltration temperature is 100℃~140℃, fill the supercritical fluid to the infiltration pressure, the infiltration pressure is 1~15MPa , and then infiltrate under the infiltration temperature and infiltration pressure, and the infiltration time is 10 to 600 minutes;

[0022] Step 2: The temperature of the pressure vessel B is kept at the saturation temperature, and the saturation temperature is 150 ° C ~ 220 ° C, and then go through the "unloading-taking-installing-closing-filling" procedure, and the "unloading-taking-installing-closing-filling" procedure Complete within 5 minutes, then the pressure vessel B is saturated at the saturation temperature and pressure, and the satura...

Embodiment 1

[0069] Place the polycarbonate sheet (Sabic 123R, MFR 17.5g / 10min, size 50cm×100cm×2cm) in the pressure vessel A, and seal the pressure vessel A, raise the temperature to 130°C, and fill it with supercritical carbon dioxide to 12MPa, Then infiltrate for 180min;

[0070] The temperature of pressure vessel B is kept at 167°C, and then undergoes the procedure of "unloading-taking-installing-closing-filling", and the completion time of the procedure of "unloading-taking-installing-closing-filling" is 115s, and then pressure vessel B is saturated Saturated under temperature and saturation pressure, the saturation time is 30 minutes, the specific steps of the "unloading-taking-installing-closing-filling" procedure are: depressurize the pressure vessel A, and take out the soaked polycarbonate sheet from the pressure vessel A , and put it into the pressure vessel B, seal the pressure vessel B, fill it with supercritical carbon dioxide to the saturation pressure, and the saturation pre...

Embodiment 2

[0074] It was the same as Example 1 except that the polycarbonate raw material constituting the polycarbonate sheet in Example 1 was changed (NOVAREX 7022R, MFR: 14 g / 10min).

[0075] The prepared polycarbonate microcellular foamed sheet has a density of 0.178g / cm 3 , and the internal cell morphology was analyzed by scanning electron microscopy, such as figure 2 As shown, the measured average pore diameter is 22 μm, and the number of cells whose diameter is more than 2 times the average diameter is 1.4%. The cell uniformity is good, and the calculated cell density is 7.13X10 8 piece / cm 3 .

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Abstract

The invention relates to a method for preparing a polycarbonate microcellular foaming material through a supercritical fluid technology. The method comprises the following steps: putting a polycarbonate material into a device with a specific wetting temperature and wetting pressure of a specific supercritical fluid, and preserving the heat and keeping the pressure for specific time; preserving theheat and keeping the pressure for specific time with a relatively high saturation temperature and relatively high critical fluid saturation pressure, and releasing pressure with a specific pressure releasing rate, thereby obtaining the polycarbonate microcellular foaming material. The method is a method which is suitable for industrially producing and efficiently preparing the polycarbonate microcellular foaming material.

Description

technical field [0001] The invention relates to a method for preparing a polycarbonate microcellular foaming material, in particular to a method for preparing a polycarbonate microcellular foaming material by supercritical fluid technology. Background technique [0002] Polymer microcellular foamed material is a material with superior performance, exhibiting good mechanical properties, thermal properties and processability. Compared with unfoamed polymers, the density of microcellular foamed materials can be reduced by 5% to 95%, the impact strength can be increased by up to 5 times, the toughness is increased by 5 times, the stiffness is increased by 3 to 5 times, and the fatigue life is extended by 5 times. The dielectric constant and thermal conductivity drop dramatically. Due to these unique properties, the application fields of microporous foam materials are very broad, such as aircraft and auto parts, sports equipment, thermal insulation fibers, molecular filters, bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L69/00
CPCC08J9/122C08J2203/06C08J2203/08C08J2205/044C08J2369/00
Inventor 李文强周发俊韩鹿伟
Owner 宁波致微新材料科技有限公司
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