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A preparation process of injection molding high density microporous foam material

A microcellular foaming material and injection molding technology, applied in the field of microcellular foaming, can solve problems such as limited pressure drop rate, achieve the effects of improving mechanical properties, realizing regulation, and improving stability

Active Publication Date: 2020-06-09
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the effect of cavity resistance, a large holding pressure is required to ensure the redissolution of the bubble nuclei formed during the filling process. At the same time, the pressure drop rate during the natural cooling process is limited, and it is difficult to form a large number of gas nuclei in a short period of time.

Method used

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  • A preparation process of injection molding high density microporous foam material
  • A preparation process of injection molding high density microporous foam material
  • A preparation process of injection molding high density microporous foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] by PS / N 2 System injection molding high-density microcellular foam material:

[0051] The raw materials are melted and plasticized and mixed with supercritical fluid, injected and filled into the mold cavity, and then the space of the mold cavity is compressed so that the gas in it is dissolved in the filled solution again, and then the space of the mold cavity is quickly released to restore it to Compress the size of the mold cavity before performing secondary foaming, and finally cool and solidify to obtain the microcellular foamed material.

[0052] The melting and plasticizing temperature of raw materials is 230°C, the SCF content is 0.6wt%, the back pressure is 100bar, and the speed of injection filling into the mold cavity is 60cm 3 / s.

[0053] When the space of the mold cavity is compressed so that the gas therein dissolves in the filled solution again, the pressure in the cavity is 10.5 bar, and the compression time is 0s (that is, no compression, which is eq...

Embodiment 2

[0056] by PS / N 2 System injection molding high-density microcellular foam material:

[0057] The raw materials are melted and plasticized and mixed with supercritical fluid, injected and filled into the mold cavity, and then the space of the mold cavity is compressed so that the gas in it is dissolved in the filled solution again, and then the space of the mold cavity is quickly released to restore it to Compress the size of the mold cavity before performing secondary foaming, and finally cool and solidify to obtain the microcellular foamed material.

[0058] The melting and plasticizing temperature of raw materials is 230°C, the SCF content is 0.6wt%, the back pressure is 200bar, and the speed of injection filling into the mold cavity is 60cm 3 / s.

[0059] Compress the space of the mold cavity so that the gas in it dissolves in the filled solution again, the pressure in the cavity is 50.7 bar, and the compression time is 5s. If the compression mold described in the specif...

Embodiment 3

[0062] by PS / N 2 System injection molding high-density microcellular foam material:

[0063] The raw materials are melted and plasticized and mixed with supercritical fluid, injected and filled into the mold cavity, and then the space of the mold cavity is compressed so that the gas in it is dissolved in the filled solution again, and then the space of the mold cavity is quickly released to restore it to Compress the size of the mold cavity before performing secondary foaming, and finally cool and solidify to obtain the microcellular foamed material.

[0064] The melting and plasticizing temperature of raw materials is 230°C, the SCF content is 0.6wt%, the back pressure is 100bar, and the speed of injection filling into the mold cavity is 60cm 3 / s.

[0065] Compress the space of the mold cavity so that the gas in it is dissolved in the filled solution again, the pressure in the cavity is 111.2bar, and the compression time is 5s. If the compression mold described in the spe...

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Abstract

The invention belongs to the technical field of microporous foaming, and particularly relates to a preparation process of an injection molding high-density microporous foaming material. The preparation process includes: melting and plasticizing a raw material, then mixing with supercritical fluid, and injecting to fill a die cavity; compressing space of the die cavity to enable gas therein to be re-dissolved in a filled solution; releasing the space of the die cavity for secondary foaming; cooling and curing to obtain the microporous foaming material. The preparation process can well realize regulation on final performance of foam structure of injection molding SCF microporous foaming products.

Description

technical field [0001] The invention belongs to the technical field of microcellular foaming, and in particular relates to a preparation process of an injection-molded high-density microcellular foaming material. Background technique [0002] Today's society is facing the global energy crisis and environmental pollution. The existence of a large number of tiny cells in injection-molded supercritical fluid (Supercritical Fluids, SCF) microcellular foaming materials can reduce the raw materials used in the product and the energy consumed, and the existence of micron-sized cells can act as a blunt crack tip. Effect. SCF microcellular foam injection molding is an advanced foam injection molding process. Trexel launched in 2000 Trademark successfully commercialized SCF microcellular foam injection molding technology. Its main advantages are as follows: (1) The existence of a large number of cells reduces the use of materials and reduces the weight of the product; (2) signifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/02B29C44/42B29C44/58
CPCB29C44/02B29C44/422B29C44/58
Inventor 董斌斌宋刚白天天刘春太曹伟甘书峰肖梦君李庆涛
Owner ZHENGZHOU UNIV