Preparation method of high-power foamed polypropylene plate

A technology for foaming polypropylene and polypropylene is applied in the field of preparation of foamed materials and can solve the problems of long heating time, low production efficiency, poor thermal conductivity and the like

Inactive Publication Date: 2021-05-11
东莞海博斯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

[0005] However, in the kettle-type foaming process, due to the poor thermal conductivity of the material, in order to achieve a constant temperature of the material in the high-pressure reactor, a dispersant and a heat-conducting medium (mainly water) are often added, which leads to a long heating time of the material. The energy consumption is high, and the post-treatment separation and drying process is added, and the production efficiency is low; at the same time, the material is heated for a long time, and it is often easy to agglomerate and agglomerate, which increases the difficulty of subsequen...

Method used

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  • Preparation method of high-power foamed polypropylene plate
  • Preparation method of high-power foamed polypropylene plate
  • Preparation method of high-power foamed polypropylene plate

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preparation example Construction

[0027] The invention provides a method for preparing a high-expansion foamed polypropylene sheet, the preparation method comprising the following steps:

[0028] Step 1. Place the polypropylene granules in a mold cavity at constant temperature, fill them with supercritical fluid, carry out pressure-holding infiltration and swelling on the polypropylene granules, and form a polymer-supercritical fluid homogeneous system after reaching an equilibrium state;

[0029] Step 2, cooling the polymer-supercritical fluid homogeneous system, and standing the polymer-supercritical fluid homogeneous system after cooling until it is stable;

[0030] Step 3, pressure release and foaming to obtain a polypropylene foam board.

[0031] General-purpose polypropylene is a semi-crystalline polymer, usually with a degree of crystallinity > 25%, and the molecular structure of the crystalline region is regularly arranged, so it is difficult for supercritical fluid to swell and penetrate it. The trad...

Embodiment 1

[0042] A method for preparing a high-expansion expanded polypropylene board, using a general-purpose polypropylene resin with a melt index of 1.5g / 10min, and drying the polypropylene particles for later use. The preparation method includes the following steps:

[0043] Step 1. Put the propylene particles in the mold cavity of the hot press. The temperature of the mold cavity is 185°C. After replacing the air in the mold cavity, fill it with carbon dioxide. The supercritical fluid pressure is maintained at 15MPa, and the pressure holding time is 5 minutes;

[0044]Step 2. Cool down the temperature of the mold cavity to 125°C, and the cooling time is 30 minutes. While cooling down, the pressure in the mold cavity is maintained at 15MPa through a booster pump;

[0045] Step 3. Relieve the pressure through the pneumatic ball valve at a pressure relief rate of 100MPa / s, quickly relieve the pressure in the mold cavity from 15MPa to 0MPa, open the mold and foam, and obtain a polypropy...

Embodiment 2

[0048] A preparation method of a high-expansion expanded polypropylene board, using general-purpose polypropylene resin with a melt index of 20g / 10min, drying the polypropylene particles for later use, the preparation method comprising the following steps:

[0049] Step 1. Put the propylene particles in the mold cavity of the hot press. The temperature of the mold cavity is 165°C. After replacing the air in the mold cavity, fill it with carbon dioxide. The supercritical fluid pressure is maintained at 10MPa, and the pressure holding time is 15 minutes;

[0050] Step 2. Cool down the mold cavity temperature to 115°C, and the cooling time is 10 minutes. While cooling down, use the booster pump to maintain the pressure in the mold cavity at 10MPa;

[0051] Step 3. Relieve the pressure through the pneumatic ball valve at a pressure relief rate of 50MPa / s, quickly relieve the pressure in the mold cavity from 10MPa to 0MPa, open the mold for foaming, and obtain a polypropylene foam b...

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Abstract

The invention relates to a preparation method of a high-power foamed polypropylene plate, which comprises the following steps: step 1, placing polypropylene particles in a constant-temperature mold cavity, filling supercritical fluid, carrying out pressure-maintaining permeation and swelling on the polypropylene particles, and forming a polymer-supercritical fluid homogeneous system after reaching an equilibrium state; step 2, cooling the polymer-supercritical fluid homogeneous system, and standing the polymer-supercritical fluid homogeneous system after cooling until the polymer-supercritical fluid homogeneous system is stable; and step 3, releasing pressure and foaming to obtain the polypropylene foamed board. According to the preparation method, the production efficiency is high, the process time is 15-45 min, and the product foaming ratio is high; the prepared polypropylene foamed sheet can be used for a long time at the temperature of-50 to 120 DEG C; and the prepared high-power foamed polypropylene plate is high in expansion rate which can reach 40-60 times, the cell diameter is 150-300 microns, and the foamed sheet is an ultra-light material with excellent performance.

Description

technical field [0001] The invention relates to a method for preparing foamed materials, in particular to a method for preparing a high-expansion foamed polypropylene board. Background technique [0002] Polypropylene resin is a general-purpose polymer material with a temperature resistance above 120°C, and is widely used in packaging, sporting goods, automobiles and other fields. Supercritical fluid (SCF, supercritical fluid) refers to a fluid above the critical temperature and above the critical pressure. Because its viscosity and diffusion coefficient are close to those of gas, and its density and solvation ability are close to that of liquid, the advantages of fast diffusion rate and high solubility of supercritical fluid in polymers can be used to prepare polymer foaming materials. Supercritical fluid foaming technology, the entire foaming process is clean, and will not pollute the environment and foamed products, so supercritical fluid foaming technology has attracted...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L23/12
CPCC08J9/122C08J2323/12C08J2203/06C08J2203/08
Inventor 陈伟
Owner 东莞海博斯新材料科技有限公司
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