Physical foaming method of high polymer material and foaming product

A polymer material and physical foaming technology, applied in the field of polymer material physical foaming method and foamed products, can solve the problems of cumbersome and time-consuming process, high specific gravity, low elasticity, etc., and achieve smooth surface appearance, excellent elasticity, Energy Saving Effect

Inactive Publication Date: 2019-01-04
DONGGUAN HAILEX HIGH POLYMER MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production of low specific gravity polyolefin chemical foaming materials requires the use of chemical foaming agents, which usually have the following disadvantages: they do not meet environmental protection requirements; there are harmful substances in the decomposition substances of foaming agents, which do not comply with relevant safety regulations
[0003] The above method of making special-shaped physical foaming materials usually has the following disadvantages:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] -Preparation of shaped embryos-

[0022] In the physical foaming method for polymer materials of the present invention, an injection machine, an extruder or a die press is used to make the above-mentioned raw materials (thermoplastic elastomer or polyolefin material) into a profiled embryo.

[0023] The preparation of shaped blanks can be carried out under suitable conditions. For example, for polyolefin materials to be crosslinked, they can be molded at a mold temperature of 160-180°C and a suitable clamping pressure such as 10Mpa for 400-550 seconds.

[0024] The present invention has no particular limitation on the shape of the profiled embryos. Generally, the profiled embryos may be in the shape of flakes, particles, and the like.

[0025] After the shaped embryo is formed, in order to increase the molecular chain strength of the polyolefin material, the polyolefin material can be cross-linked. The cross-linking reaction can be carried out by chemical cross-linking and / or e...

Example Embodiment

[0046] Example 1

[0047] Put 100phr of EVA (Formosa Plastics EVA7470, the molar content of vinyl acetate is 26%), 1phr of calcium carbonate, 0.5phr of paraffin wax and 0.5phr of DCP in the ST-75L internal mixer of Santai Machinery Co., at 100 Mix for 12 minutes at ℃ and 0.75Mpa pressure. After unloading, the above mixture is extruded and granulated (rubber pellets) with an extrusion granulator matched with the ST-75L internal mixer of Santai Machinery Company. The rubber pellets were molded and cross-linked in an EVA injection machine of KM-E308L3 from Jumin Machinery Company at a mold temperature of 180°C.

[0048] Put the cross-linked polyolefin parison into the autoclave of Deyang Si Chuang Company, and inject carbon dioxide supercritical fluid, and maintain it at a temperature of 50° C. and a pressure of 40 Mpa for 2 hours. Then, the pressure was released to normal pressure within 30 minutes to obtain a parison impregnated with supercritical fluid (the pre-expansion magnific...

Example Embodiment

[0052] Example 2

[0053] In addition to replacing EVA with an EVA / POE mixture with a blending ratio of 60 / 40 (where the molar content of EVA's vinyl acetate is 26%, and the POE is the Dow Chemical Company’s 8150 POE), the same applies to the examples 1 The same procedure is used to obtain finished foam products.

[0054] The specific gravity, cell diameter, and resilience performance of the finished foamed product are 0.13, 0.5-1.5 mm and 60%, respectively.

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Abstract

The invention relates to a physical foaming method of a high polymer material and a foaming product. The physical foaming method of the high polymer material comprises the steps that 1, a thermoplastic elastomer or a polyolefin material is prepared into special-shaped parison by using an injection molding machine, an extruding machine or a molding press; 2, the polyolefin parison is heated to produce cross-linking reaction, and the cross-linked polyolefin parison is obtained; 2, the thermoplastic elastomer parison or the cross-linked polyolefin parison is subjected to high-pressure infiltration in a pressure kettle with a supercritical fluid, then pressure relief is performed to normal pressure, and the supercritical fluid infiltrated parison is obtained; 4, the supercritical fluid infiltrated parison is arranged in a finished product mold, and in-mold foaming is performed according to the ratio of 1:1 to obtain the finished product foaming product. The supercritical fluid is utilizedas a physical foaming agent, and the low-specific-gravity, environment-friendly and non-toxic foaming material having excellent elasticity is obtained through a simple in-mold foaming process.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a physical foaming method for polymer materials and foamed products. Background technique [0002] The foaming process is one of the commonly used processes for making low specific gravity materials. The foaming process can be divided into chemical foaming process and physical foaming process according to the foaming agent used. The traditional production of low specific gravity polyolefin chemical foaming materials requires the use of chemical foaming agents, which usually have the following disadvantages: they do not meet environmental protection requirements; there are harmful substances in the decomposition substances of foaming agents, which do not comply with relevant safety regulations. Traditionally, the main methods of making polyolefin physical foaming materials are gas-assisted injection molding, extrusion molding, etc., using alkane gases, low-volatile point compound...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L91/06C08L75/04C08K3/26C08K5/14C08J9/12
CPCC08J9/0023C08J9/0061C08J9/0066C08J9/122C08J2203/06C08J2203/08C08J2323/08C08J2375/04C08J2423/08C08J2491/06B29C44/3453B29C44/348B29C44/3488B29C44/44B29K2023/0633B29K2023/083C08J2201/026C08J2201/03C08J2300/22C08J2300/26C08J2323/02C08J2323/04C08J2323/06C08J2367/00C08J2377/00C08K3/013C08K3/26C08K5/14C08K2003/265C08L23/0853C08L71/02B29B11/06B29C44/02B29K2509/02C08J3/24C08J2205/10C08J2423/00
Inventor 罗振寰刘伏奇
Owner DONGGUAN HAILEX HIGH POLYMER MATERIAL SCI & TECH CO LTD
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