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A polymer microfoaming device and process based on foaming injection molding

A polymer and micro-foaming technology, which is applied in the field of microcellular foaming of polymer materials, can solve problems such as limited foaming space for products with complex shapes, reduced molding efficiency, surface defects of parts and failure to achieve weight loss, etc. Achieve the effects of reducing the diffusion time of supercritical fluid, shortening the temperature stabilization time, reducing orientation and chain scission

Active Publication Date: 2022-04-08
福建鑫瑞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

[0006] Chinese patent CN 111688106 A discloses a micro-foaming injection molding device and method, in which compressed air is injected into the foaming material to prevent the foaming gas in the gas-filled molten injection molding material from overflowing before the surface of the part is finalized , resulting in surface defects and weight loss of the part that cannot meet the set requirements; at the same time, after injection molding, wait until the mold cavity starts to cool, the surface gradually hardens, and when most of the gas wrapped in the material cannot overflow, remove the gas pressure of the circulating air tank, This can ensure that the outer surface of the foamed material is good after the mold cavity is shaped, and the internal microporous part structure can be obtained, but it cannot solve the problems of limited foaming space and low foaming ratio of products with complex shapes and large thicknesses.
The disadvantages of this process are: (1) affected by the mold space, the polymer melt is subjected to a large shear force during filling the cavity; (2) the foaming is induced by heating the mold, the operation time is long, and the molding efficiency decreases , low foaming ratio

Method used

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  • A polymer microfoaming device and process based on foaming injection molding
  • A polymer microfoaming device and process based on foaming injection molding
  • A polymer microfoaming device and process based on foaming injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The raw material is polyester elastomer (TPEE) produced by DuPont (DUPONT), the brand is 4056, and its density is 1.15g / cm 3 (@23℃). The TPEE particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 80° C., and the drying time was 5 hours. Using fully dried TPEE pellets as pellets, the injection molding and autoclave foaming process tests were carried out.

[0064] The first step is to close the mold for the first time, leaving a certain gap between the movable mold and the fixed mold, and heating the mold;

[0065] In the second step, when the mold cavity rises to 100°C, inject high-pressure CO into the cavity 2 ;

[0066] In the third step, when the gas pressure in the mold cavity reaches 8MPa, inject TPEE melt and CO into the mold cavity 2 a homogeneous mixture where CO 2 The mass fraction of is 8wt%;

[0067] The fourth step is the second mold clamping, compressing the polymer melt, the holding pressure is 50MPa, and the ho...

Embodiment 2

[0072] The raw material is nylon elastomer (PEBAX) produced by French Arkema (ARKEMA), the brand is 4533, and its density is 1.02g / cm 3 (@23℃). The PEBAX particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 75° C., and the drying time was 6 hours. Using the fully dried PEBAX granules as pellets, the injection molding preform and autoclave foaming process tests were carried out.

[0073] The first step is to close the mold for the first time, leaving a certain gap between the movable mold and the fixed mold, and heating the mold;

[0074] In the second step, when the mold cavity rises to 120°C, inject high-pressure N into the cavity 2 ;

[0075] In the third step, when the gas pressure in the mold cavity reaches 6MPa, inject PEBAX melt and CO into the mold cavity 2 a homogeneous mixture where CO 2 The mass fraction of is 5wt%;

[0076] The fourth step is the second mold clamping, compressing the polymer melt, the holding pressure i...

Embodiment 3

[0081] The raw material is heat-resistant polymethyl methacrylate (PMMA) produced by Zhenjiang Chimei Company, the brand is CM-205, and its density is 1.19g / cm 3 (@23℃). The PMMA particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 75° C., and the drying time was 4 h. Using fully dried PMMA pellets as pellets, the injection molding and autoclave foaming process tests were carried out.

[0082] The first step is to close the mold for the first time, leaving a certain gap between the movable mold and the fixed mold, and heating the mold;

[0083] In the second step, when the mold cavity rises to 30°C, inject high-pressure N into the cavity 2 ;

[0084] In the third step, when the gas pressure in the mold cavity reaches 3MPa, inject PMMA melt, CO 2 , N 2 a homogeneous mixture where CO 2 The mass fraction is 3wt%, N 2 The mass fraction is 0.3wt%;

[0085] The fourth step is the second mold clamping, compressing the polymer melt, the...

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Abstract

The invention relates to the technical field of microcellular foaming of polymer materials, in particular to a polymer microfoaming device and process based on foaming injection molding; the device includes an injection molding mold, a gas storage tank, a gas injection pump, and a reaction kettle and a temperature controller; the gas storage tank, the gas injection pump, the reactor and the temperature controller are connected in sequence; the injection molded product prepared by the injection molding mold forms a foamed product in the reactor. The process is to firstly prepare an injection-molded preform product that is less affected by shearing or has a small number of cells in the core, and then quickly transfer the injection-molded product to a preheated reaction kettle, and then inject a supercritical fluid to carry out foaming to obtain the final product.

Description

technical field [0001] The invention relates to the technical field of microcellular foaming of polymer materials, in particular to a polymer microfoaming device and process based on foaming injection molding. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The polymer foaming process uses a thermoplastic polymer as the matrix, and uses a foaming agent to promote cell nucleation and growth, thereby obtaining a porous structure, lightweight polymer foam material, which can be widely used in sound insulation, heat insulation, electromagnetic shielding, Strain sensor, oil-water separation and other fields. Common thermoplastic polymers include polypropylene (PP), polystyren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C44/60B29C45/17B29C45/40B29C45/64B29C45/73B29C69/02
CPCB29C69/02B29C45/174B29C45/64B29C45/73B29C45/40B29C44/35B29C44/60
Inventor 王桂龙刘学栋潘涵遇赵国群
Owner 福建鑫瑞新材料科技有限公司