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Supercritical fluid foaming polyolefin material and preparing method thereof

A technology for foaming polyolefin and supercritical fluid, applied in the field of foaming materials, can solve the problems of poor adjustment of cell diameter and cell density, difficulty in obtaining foamed materials with regular shapes, and large amount of supercritical fluid, etc. Achieve the effect of shortening the heating and pressurization time, excellent mechanical strength, and accelerating the gas diffusion rate

Active Publication Date: 2016-11-23
湖州长园特发科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) At present, the supercritical fluid solid-state intermittent foaming process usually has a low saturation temperature, and the gas saturation process takes several hours or even dozens of hours. The required amount of supercritical fluid is large, the equipment occupies a large area, and the production efficiency is low. lower, higher cost;
[0007] (2) The nucleation sample of the prior art is foamed under conditions higher than the immersion temperature and pressure, and the sample is easily deformed after foaming, and it is not easy to obtain a regular-shaped foaming material
[0008] (3) The cell diameter and cell density of the obtained foaming material are not easy to adjust, the cell uniformity is not enough, and the mechanical strength is low at a higher expansion ratio; some have requirements for the crystallinity of the material

Method used

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  • Supercritical fluid foaming polyolefin material and preparing method thereof
  • Supercritical fluid foaming polyolefin material and preparing method thereof
  • Supercritical fluid foaming polyolefin material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The process of radiation cross-linked polyethylene foam material, according to figure 1 The process flow chart is carried out, including the following steps:

[0053] 1) LDPE sheet extrusion molding: use an extruder to extrude an LPDE sheet, wherein the melting point of LPDE is T m It is 111°C.

[0054] 2) Radiation cross-linked LDPE: The radiation cross-linked LDPE is obtained by irradiating the LDPE sheet with a high-energy electron beam, wherein the radiation dose is 40 kGy.

[0055] 3) High-pressure nitrogen impregnation process: raise the autoclave to the set temperature, then put the above-mentioned radiation-crosslinked LDPE sample into the autoclave, and then inject nitrogen gas with a high-pressure pump, so that the radiation-crosslinked LDPE sample is immersed at a temperature of 180 °C, Under the impregnation pressure of 40.1MPa, keep the pressure in the autoclave for 1 hour, so that the radiation crosslinked LDPE sample absorbs enough nitrogen.

[0056] 4...

Embodiment 2

[0059] On the basis of Example 1, the irradiation dose of the LDPE sheet in this example is 60kGy, the impregnation pressure is 50MPa, the impregnation temperature is 200°C, the pressure relief time is 10s, the foaming temperature is 150°C, and the foaming pressure is 3MPa.

Embodiment 3

[0061] On the basis of Example 1, the irradiation dose of the LDPE sheet in this example is 80kGy, the impregnation pressure is 30MPa, the impregnation temperature is 220°C, the pressure relief time is 5s, the foaming temperature is 180°C, and the foaming pressure is 1.5Mpa .

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Abstract

The invention provides a supercritical fluid foaming polyolefin material and a preparing method thereof. The supercritical fluid foaming polyolefin material is prepared through the following steps that a polyolefin sheet is prepared, and the melting point of the polyolefin sheet is Tm; radiation crosslinking is carried out on the polyolefin sheet; the crosslinked polyolefin sheet is put into a pressure container for high-pressure nitrogen impregnation, and the impregnation temperature T1 is equal to Tm+(30-120) DEG C; low-temperature heating foaming is carried out, and the foaming temperature T3 is equal to Tm+(20-50) DEG C, and is smaller than T1. By the adoption of the technical scheme, the requirement for material crystallinity is avoided, the time of reaching a dissolution saturation state of gas is greatly shortened, efficiency is improved, and the foaming material which is fine and uniform in bubble, low in density, high in mechanical strength and regular in shape can be obtained.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a supercritical fluid foaming polyolefin material and a preparation method thereof. Background technique [0002] Foam materials are widely used in daily necessities, vehicles, construction, electrical appliances, packaging materials, sports facilities and other industries because of their functions of heat preservation, heat insulation, shock absorption, and sound insulation. High-performance foam plastics can also be used in military, aerospace, etc. Cutting edge field. [0003] According to the different foaming agents used, plastic foaming can be divided into two categories: physical foaming method and chemical foaming method. The chemical foaming method is generally to add chemical foaming agents such as azodicarbonamide (AC), azobisisobutyronitrile (AIBN), sodium bicarbonate and ammonium bicarbonate, etc., and heat to decompose the foaming agent to ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J7/12C08L23/06
CPCC08J7/123C08J9/122C08J2203/06C08J2203/08C08J2323/06
Inventor 石洪军刘鹏波王勇范宇
Owner 湖州长园特发科技有限公司
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