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Preparation method of polypropylene microcellular foaming material

A technology of microcellular foaming material and polypropylene material, applied in the field of preparing polypropylene microcellular foaming material, can solve the problems of uneven cell size, residual material, incompetence, etc. Good uniformity and the effect of improving foaming efficiency

Inactive Publication Date: 2018-02-23
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

Chemical foaming generally uses organic matter such as azodicarbonamide that will decompose and generate gas at high temperatures as a foaming agent. After the organic foaming agent is decomposed, there will be residues in the material, which is difficult to perform in some use environments that require materials.
The traditional physical foaming method is to gradually change the thermodynamic state of the gas, resulting in uneven cell size, resulting in unstable performance of the foamed material

Method used

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  • Preparation method of polypropylene microcellular foaming material
  • Preparation method of polypropylene microcellular foaming material
  • Preparation method of polypropylene microcellular foaming material

Examples

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preparation example Construction

[0021] The preparation method of the polypropylene microcellular foam material of the present invention comprises step 1, step 2 and step 3;

[0022] Step 1: Place the polypropylene material in the pressure vessel A, seal the pressure vessel A, raise the temperature to the infiltration temperature, the infiltration temperature is 40℃~110℃, fill the supercritical fluid to the infiltration pressure, the infiltration pressure is 1~15MPa, Then infiltrate under the infiltration temperature and infiltration pressure, and the infiltration time is 10-600min;

[0023] Step 2: The temperature of pressure vessel B is kept at the saturation temperature, and the saturation temperature is 120°C ~ 160°C, and then go through the "unload-take-install-close-fill" procedure, and the "unload-take-install-close-fill" procedure Complete within 5 minutes, then the pressure vessel B is saturated at the saturation temperature and pressure, and the saturation time is 10-60 minutes.

[0024] The specif...

Embodiment 1

[0068] Place the polypropylene plate (the Mw / Mn of the polypropylene resin is 2.6, the MFR is 1.8g / 10min, the size is 40cm×40cm×2cm) in the pressure vessel A, and the pressure vessel A is sealed, the temperature is raised to 100°C, and filled with Supercritical carbon dioxide to 12MPa, then soak for 120min;

[0069] The temperature of pressure vessel B is kept at 144°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, take out the soaked polypropylene sheet from the pressure vessel A, And put it into the pressure vessel B, seal the pressure vessel B, fill with supercritical carbon dioxide to the satu...

Embodiment 2

[0073] The same as Example 1 except that the polypropylene raw material constituting the polypropylene sheet in Example 1 was changed (the Mw / Mn of the polypropylene resin was 13.2, and the MFR was 5.7 g / 10min).

[0074] The prepared polypropylene microporous foam board has a density of 0.033g / 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, the number of cells whose diameter is more than 2 times the average diameter is 1.8%, the cell uniformity is good, and the calculated cell density is 5.13×10 9 piece / cm 3 .

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Abstract

The invention relates to a method of preparing a polypropylene microcellular foaming material by means of supercritical fluid technology. The method comprises the following steps of: putting a polypropylene material in a device with a special infiltration temperature and an infiltration pressure of a special supercritical fluid; keeping the temperature and pressure for a special time; then keepingthe temperature and the pressure for a special time at a relatively high saturation temperature and a relatively high supercritical fluid saturation pressure; and relieving the pressure at a specialpressure-relieving rate to obtain the polypropylene microcellular foaming material. The method is the method which is suitable for industrial production and prepares the polypropylene microcellular foaming material efficiently.

Description

technical field [0001] The invention relates to a method for preparing a polypropylene microcellular foaming material, in particular to a method for preparing a polypropylene 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): B29C44/08B29C44/60B29C44/34
CPCB29C44/08B29C44/34B29C44/3403B29C44/60
Inventor 周发俊李文强韩鹿伟
Owner 宁波致微新材料科技有限公司
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