Supercritical fluid-assisted polymer mould foaming apparatus

A supercritical fluid and foaming device technology, applied in the field of polymer material processing, can solve the problems of large equipment investment and low foaming efficiency, and achieve the effects of simple device structure, low cost and wide application range

Inactive Publication Date: 2014-10-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different molding methods have different characteristics. Continuous extrusion molding is suitable for continuous extrusion of foamed materials with a certain cross-sectional shape. Injection foaming molding can inject foamed products with complex shapes. Both have high efficiency, but the investment in equipment is large; Batch pressure foaming efficiency is low, mainly used for experimental research

Method used

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  • Supercritical fluid-assisted polymer mould foaming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] 1. Controllable foaming of thermoplastics or thermoplastic elastomers

[0037] With reference to the accompanying drawings, place the mold system between the upper heating plate 14 and the lower heating plate 15 of the molding machine to preheat to the set temperature, open the upper mold 5, put a certain amount of material to be foamed 16 into the forming mold 8, and close it. Mold, preheat the unfoamed material to melting or close to melting, open the intake valve 3, open the pressure relief valve 12, pass a certain pressure of supercritical fluid into the mold, drain the air inside the mold, and then close the pressure relief valve , continue to feed the supercritical fluid until the internal pressure of the mold reaches the set value. Under a certain temperature and pressure, the supercritical fluid gradually diffuses into the polymer matrix until it reaches saturation, stop heating, open the pressure relief valve 12, quickly release the internal pressure of the mol...

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Abstract

The invention provides a supercritical fluid-assisted polymer mould foaming apparatus, comprising a supercritical fluid conveying system, a mould system, a temperature measuring device, a pressure measuring device, a pressure relief device, a display and control system, etc., wherein the supercritical fluid conveying system is connected with the mould system, the temperature measuring device, the pressure measuring device and the pressure relief device are respectively connected with the mould system, and the mould system carries out heating by using upper and lower hot plates of a moulding press. In virtue of ultra-strong penetration and diffusion capability of a supercritical fluid, the supercritical fluid gradually diffuses into a polymer matrix under the action of a certain temperature and supercritical fluid pressure in a certain period of time, and then pressure is rapidly released so as to obtain a foamed material with a certain shape. The apparatus can be used for supercritical fluid foaming of thermoplastic plastics, thermoplastic elastomer, rubber materials and the like, is applicable to free foaming or controlled foaming and has the advantages of a simple structure, low cost and convenient operation.

Description

technical field [0001] The invention relates to the field of polymer material processing, and relates to a supercritical fluid-assisted polymer molding and foaming device, which can be used for supercritical fluid foaming of thermoplastics, thermoplastic elastomers or rubber materials. Background technique [0002] Supercritical fluid refers to the fluid whose temperature and pressure are higher than its critical point. Supercritical fluid has gas-like diffusivity and liquid-like solubility, and has the characteristics of low viscosity and low surface tension. Therefore, supercritical fluid Has super penetrating ability. Supercritical CO 2 and N 2 It has the characteristics of non-toxic, non-flammable, cheap, and chemically inert. At the same time, due to its strong self-nucleating ability, it can precipitate a large number of nuclei when it is thermodynamically unstable (when the pressure suddenly drops or the temperature rises), and it can prepare polymers. Microcellula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/02B29C44/34
Inventor 高长云冷秀江
Owner QINGDAO UNIV OF SCI & TECH
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