Method for preparing polymer microporous foaming material by supercritical mould foaming

A microcellular foaming material and polymer technology, which is applied in the field of preparing polymer microcellular foaming materials by using supercritical fluid technology, can solve the problems of small cell density, low bubble nucleation rate, limited weight reduction effect, etc. The effect of high pore density, high cell nucleation rate, and shortened molding cycle

Active Publication Date: 2011-08-31
常州福源科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low nucleation rate of the bubbles, the obtained pore density is small, and only a small weight loss of the foamed product can be achieved. Generally, the weight loss of the injection molded microcellular foamed product cannot exceed 30%, so the weight loss effect is limited.

Method used

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  • Method for preparing polymer microporous foaming material by supercritical mould foaming
  • Method for preparing polymer microporous foaming material by supercritical mould foaming
  • Method for preparing polymer microporous foaming material by supercritical mould foaming

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Polylactic acid particles with a number-average molecular weight of 100,000 and a melting point of 120°C were kneaded by a twin-screw extruder, molded through a die, cooled and cut to make a polylactic acid plate to be expanded with a size of 20cm×20cm×1cm. The mold installed between the molding presses is heated up to 115° C., the polylactic acid plate is put into it, the molding presses are closed, and the molds are sealed. Feed 30MPa supercritical nitrogen into the mold, so that the supercritical nitrogen diffuses into the polylactic acid matrix under the conditions of 115°C and 30MPa. After 60 minutes of saturation, the diffusion equilibrium is reached, and the pressure in the mold is reduced to 10MPa through the pressure relief valve, and then the mold is opened to release the pressure and foam, the foam plate pops up, cools and shapes, and the polylactic acid microcellular foamed plate is obtained.

[0033] Based on 100 parts by weight of the polymer, after the di...

Embodiment 2

[0036] 200 g of polypropylene particles with a number average molecular weight of 200,000, a melting point of 160° C., and an average particle diameter of 4 mm were put into a mold of a molding machine, and the temperature of the mold was raised to 150° C. The molding machine closes the mold, the mold is sealed, and 10MPa supercritical carbon dioxide is introduced into the mold, so that the supercritical carbon dioxide diffuses into the polypropylene matrix under the conditions of 150°C and 10MPa. After 20 minutes of saturation, the diffusion equilibrium is reached, and the pressure in the mold is released to 2MPa through the pressure relief valve, and then the mold is opened to release the pressure and foam, and the obtained polypropylene microcellular foamed beads are collected.

[0037]Based on 100 parts by weight of the polymer, after the diffusion equilibrium is reached, the content of the supercritical fluid dissolved in the polymer is 11.5 parts.

[0038] The average pa...

Embodiment 3

[0040] Polystyrene particles with a number-average molecular weight of 400,000 and a glass transition temperature of 92°C are kneaded by a twin-screw extruder, shaped by a round-hole die, cooled and cut to make a diameter of 3 mm, each segment length A total of 200g of 20cm polystyrene rods to be expanded. The mold installed between the molding presses is heated up to 105° C., polystyrene rods are put into it, the molding presses are closed, and the molds are sealed. Feed 20MPa supercritical carbon dioxide into the mold to make the supercritical carbon dioxide diffuse into the polystyrene matrix at 105°C and 20MPa. After 15 minutes of saturation, the diffusion equilibrium is reached, the mold is opened to release the pressure and foamed, and the obtained polystyrene microcellular foamed rods are collected.

[0041] Based on 100 parts by weight of the polymer, after the diffusion equilibrium is reached, the content of supercritical fluid dissolved in the polymer is 17.3 parts....

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Abstract

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.

Description

technical field [0001] The invention relates to a method for preparing foamed materials, in particular to a method for preparing polymer microporous foamed materials by supercritical fluid technology. Background technique [0002] Polymer microporous foam material refers to the pore size less than 100μm and the pore density greater than 1.0×10 6 piece / cm 3 porous polymer foam. Due to the existence of a large number of micron-sized cells inside the material, microcellular foamed materials have excellent shock absorption, heat insulation and sound absorption properties, and can be widely used in packaging, heat insulation, shock absorption and cushioning, and sound absorption and sound absorption. In particular, when the pore size of the polymer microporous foam material is less than 10 μm, the existence of a large number of micropores will significantly reduce the weight of the polymer product without significantly reducing the mechanical properties of the polymer, so the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J9/18B29C44/60C08L23/06C08L67/04C08L23/12C08L25/06C08L33/12C08L69/00C08L55/02C08L67/02C08L77/00C08L79/08C08L81/02C08L81/06C08L61/16C08L83/04C08L23/16C08L23/08C08L31/04C08L75/04
Inventor 姜修磊
Owner 常州福源科技新材料有限公司
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