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Warm isostatic pressing molding method of polymer materials

A polymer material, warm isostatic pressing technology, applied in the field of static pressing, can solve the problems of poor quality, product discoloration, high porosity, and achieve the effect of reducing dosage, improving mechanical properties and regular shape

Active Publication Date: 2018-02-06
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the deficiencies of the prior art and provides a warm isostatic pressing molding method for polymer materials, which is used to solve the technical problems of product discoloration, high porosity and poor quality in the molding process of polymer materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of polymer material warm isostatic pressing forming method, it comprises the following steps:

[0024] i) Packing the raw material into the mould, and then vacuumizing the mould-powder combination;

[0025] ii) Put the mold compound into the oven and preheat it through the oven. The temperature of the oven is 28-32°C lower than the melting point of the raw materials. The drug combination is taken out;

[0026] ⅲ) After the molded drug combination is taken out, put it into a warm isostatic press to quickly increase the pressure to press. During pressing, the temperature is close to the temperature of the oven, and once pressed, the pressing pressure is 40-60 MPa, and the holding time is 0.4-0.7 Hour;

[0027] ⅳ) After the pressing is completed, slowly release the pressure;

[0028] ⅴ) After the pressure is relieved, take out the mold-powder combination, then put the mold-powder combination into the oven for a second preheating, and adjust the temperature of the...

Embodiment 2

[0033] A kind of polymer material warm isostatic pressing forming method, it comprises the following steps:

[0034] i) Packing the raw material into the mould, and then vacuumizing the mould-powder combination;

[0035] ii) Put the mold compound into the oven and preheat it through the oven. The temperature of the oven is 30°C lower than the melting point of the raw material. When the temperature of the raw material reaches the preset raw material temperature, keep the temperature constant for one hour and then combine the mold compound take out;

[0036] ⅲ) After the molded drug combination is taken out, put it into a warm isostatic press to quickly increase the pressure to press, when pressing, the temperature is close to the temperature of the oven, press once, the pressing pressure is 50MPa, and the holding time is 0.5 hour;

[0037] ⅳ) After the pressing is completed, slowly release the pressure;

[0038] ⅴ) After the pressure is relieved, take out the mold-powder comb...

Embodiment 3

[0043] Preparatory stage: Determine the shape of the molded product to make a mold for molding; the melting point of the raw material for molding.

[0044] Molding stage: Put the raw materials into the mold, and then vacuumize the mold compound combination to prevent the raw materials from being oxidized due to contact with air during the subsequent heating process. Subsequently, the temperature of the oven was adjusted to be 29°C lower than the melting point of the raw material, which solved the problem of easy flow and deformation of the raw material during the preheating process due to the uneven pressure. Preheat until the monitoring temperature of the raw material is consistent with the temperature of the oven, and then continue to keep the temperature constant for about 1 hour, then take out the mold and medicine combination, and put it into a warm isostatic press to increase the pressure. When pressing, the temperature is close to the temperature of the oven, and the pr...

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Abstract

The invention discloses a high polymer material temperature isostatic pressing method. The method includes the steps that raw materials are put into a mold, and then vacuumizing is conducted on the mold; a mold drug combination is preheated through a drying oven till the whole mold drug combination is the same as the drying oven in temperature; after being preheated, the mold drug combination is taken out and put into a temperature isostatic pressing machine to be subjected to fast pressure rising to be pressed; after pressing is completed, the pressure is relieved slowly; then the mold drug combination is put into the drying oven to be subjected to secondary preheating, the temperature of the drying oven is adjusted, and the temperature of the drying oven is higher than the melting point of the raw materials; supplementary vacuumizing is conducted on the mold drug combination after preheating is completed, then the temperature of oil in the isostatic pressing machine is adjusted to be close to the preheating temperature, and then pressing is conducted; and after secondary pressing is completed, the mold drug combination is taken out, and demolding is conducted on the mold drug combination. By the adoption of the high polymer material temperature isostatic pressing method, the problems of product deformation and discoloration generated in the high polymer material isostatic pressing process are solved, the machining difficulty is lowered, the consumption of an additive is reduced, and the quality of formed products is improved remarkably.

Description

technical field [0001] The invention relates to the technical field of polymer material molding, in particular to a polymer material warm isostatic pressing molding method. Background technique [0002] At present, the production and processing methods of polymer materials mainly include compression molding, extrusion molding, injection molding, and blow molding. However, these domestic methods still have low molding efficiency, Poor molding quality stability, serious material waste, high porosity and other problems, so more than half of the products rely on foreign imports. Compared with other molding processes, isostatic pressing technology has the advantages of isotropy, high quality, good mechanical properties, and one-time near-net molding. Due to its high-pressure processing molding characteristics, it can reduce molding temperature and reduce additives. dosage, one-time near-net molding can produce large and special-shaped parts. The isostatic pressing of polymer ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/10
CPCB29C43/10
Inventor 郭昱辰韩超兰琼
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS