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Polypropylene foam material and preparation method thereof

A foamed material, polypropylene technology, applied in the field of polypropylene foamed material and its preparation, can solve the problems of high processing cost, difficult foaming and the like

Active Publication Date: 2020-10-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a polypropylene foam in order to overcome defects such as difficult foaming of polypropylene under low temperature conditions and high processing cost in the prior art. Foam material and its preparation method

Method used

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  • Polypropylene foam material and preparation method thereof
  • Polypropylene foam material and preparation method thereof
  • Polypropylene foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Polypropylene granules (5-10g) are hot-pressed into flakes using a hot press, and the flake raw materials are placed in an autoclave, and co-foaming agent ethanol is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, with CO 2 Purge three times to remove the air in the kettle, then place the autoclave in an oil bath, heat it to 140°C at a constant rate (8°C / min), keep it warm for half an hour, and then fill it with high-pressure (15MPa) CO 2 , the pressure is controlled at 15MPa, and the sheet is saturated for 1.5h to the equilibrium of dissolution and diffusion, and then the pressure is quickly released, and the high-pressure CO in the container is released within 1s. 2 After discharging, put the autoclave into an ice-water bath to cool and set the shape to obtain a microporous foam material. The scanning electron microscope picture of the polypropylene foam product that makes is as follows figure 1 .

Embodiment 2

[0041] Polypropylene granules (5-10g) are hot-pressed into sheets using a hot press, and the sheet-like raw materials are placed in an autoclave, and a co-foaming agent butanol is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, with CO 2 Purge three times to remove the air in the kettle, then place the autoclave in an oil bath, heat it to 135°C at a constant rate (8°C / min), keep it warm for half an hour, and then fill it with high-pressure (15MPa) CO 2 , the pressure is controlled at 15MPa, and the sheet is saturated for 1.5h to the equilibrium of dissolution and diffusion, and then the pressure is quickly released, and the high-pressure CO in the container is released within 1s. 2 After discharging, put the autoclave into an ice-water bath to cool and set the shape to obtain a microporous foam material. The scanning electron microscope picture of the polypropylene foam product that makes is as follows figure 2 .

Embodiment 3

[0043] Polypropylene granules (5-10g) are hot-pressed into sheets using a hot press, and the sheet-like raw materials are placed in an autoclave, and a co-foaming agent, hexanol, is added in an amount of CO under the experimental temperature and pressure. 2 5wt% by mass, with CO 2 Purge three times to remove the air in the kettle, then place the autoclave in an oil bath, heat it to 130°C at a constant rate (8°C / min), keep it warm for half an hour, and then fill it with high-pressure (15MPa) CO 2 , the pressure is controlled at 15MPa, and the sheet is saturated for 1.5h to the equilibrium of dissolution and diffusion, and then the pressure is quickly released, and the high-pressure CO in the container is released within 1s. 2 After discharging, put the autoclave into an ice-water bath to cool and set the shape to obtain a microporous foam material. The scanning electron microscope picture of the polypropylene foam product that makes is as follows image 3 .

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Abstract

The invention discloses a polypropylene foaming material and a preparation method thereof. The preparation method comprises the following steps: foaming polypropylene and small molecular alcohol undera CO2 condition, wherein the micromolecular alcohol is alcohol with a carbon chain of C1-4, and when the micromolecular alcohol is alcohol with a carbon chain of C1-4, the foaming temperature is higher than 125 DEG C but not higher than 140 DEG C, when the small molecular alcohol is alcohol with a carbon chain of C5-10, the foaming temperature is 125-140 DEG C, and the addition amount of the small molecular alcohol is 5-10wt% of that of CO2. The preparation method is simple in process, widens the lower limit of the foaming temperature of the polypropylene, enables the polypropylene to be foamed at a lower temperature, reduces the energy consumption, and reduces the requirements on the sealing performance of equipment. In addition, the polypropylene foaming material prepared by the methodis high in foaming ratio, relatively small in pore diameter and high in cell density.

Description

technical field [0001] The invention relates to the field of polymer foaming, in particular to a polypropylene foaming material and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the most widely used industrial polymer materials. It has the advantages of high melting point, high tensile modulus and low density. Compared with polyethylene foam, polypropylene foam has good thermal stability and relatively High chemical resistance, widely used in industrial fields such as packaging, heat insulation and automotive parts. However, the high crystallinity and linear molecular structure of polypropylene lead to a narrow processing temperature range and harsh foaming process conditions. At present, most researches focus on reducing cell size and increasing porosity, such as adding nucleating agents to improve polypropylene foaming. Nucleation efficiency and the use of co-foaming agents to increase the porosity of polypropylene, etc., but did...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J9/14C08L23/12
CPCC08J9/122C08J9/142C08J2203/06C08J2203/12C08J2203/182C08J2323/12
Inventor 胡冬冬赵玲强薇高秀鲁刘涛
Owner EAST CHINA UNIV OF SCI & TECH
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