High foaming-ratio and high-density polyethylene microporous foaming section bar and its preparation method

A high-density polyethylene and microcellular foaming technology, applied in the coating and other directions, can solve the problems of only 1.1-2.0 times the foaming ratio, inevitable core layer and skin layer structure, uneven product foaming, etc. Achieve the effect of easy operation, favorable industrial production and short production cycle

Active Publication Date: 2011-11-02
浙江博发新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has long production cycle, low efficiency and high cost, and is not suitable for industrial production, and the prepared product is non-uniform foaming, which inevitably has a core layer and a skin layer structure, and the foaming ratio is very low
U.S. Patents US6376059B1 and US20020155272A1 reported a method for producing HDPE physical gas foaming materials by extrusion foaming, and prepared microcellular foaming materials with a cell diameter of 20-100 μm, but the expansion ratio was only 1.1 -2.0 times

Method used

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  • High foaming-ratio and high-density polyethylene microporous foaming section bar and its preparation method
  • High foaming-ratio and high-density polyethylene microporous foaming section bar and its preparation method
  • High foaming-ratio and high-density polyethylene microporous foaming section bar and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put the 6 kinds of HDPE raw material particles with a melt index in the range of 0.7-20g / 10min into the high-pressure mold of the physical gas foaming device to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space Foaming is performed. When the mold reaches the set temperature of 132°C, fill it with 20MPa of N2, keep the pressure at a constant temperature for 10 minutes, and then release the pressure to normal pressure at a speed of 28MPa / s. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 1.

[0040] Table 1 Comparison of structural properties of foamed materials with different melt index HDPE raw materials

[0041]

Embodiment 2

[0043] The HDPE 6 particles are placed in a high-pressure mold in a physical gas foaming device to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. When the mold reaches the set temperature, fill it with 20MPa N 2 , kept at constant temperature and pressure for 10 minutes, and then released to normal pressure at a speed of 28MPa / s. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 2.

[0044] Table 2 Comparison of structural properties of HDPE foamed materials prepared at different foaming temperatures

[0045]

Embodiment 3

[0047] Put the HDPE 1 particles in the high-pressure mold of the molding physical gas foaming device to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. When the mold reaches the set temperature of 130°C, fill it with different pressures of N 2 , constant temperature and pressure for 5-20 minutes, and then release the pressure to normal pressure at a certain speed. The foamed material was taken out and subjected to optical microscope analysis and density measurement, the results are shown in Table 3.

[0048] Table 3 Comparison of structural properties of HDPE foamed materials prepared by different foaming pressures

[0049]

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Abstract

The invention discloses a high foaming-ratio and high-density polyethylene microporous foaming section bar and its preparation method. The invention is characterized in that the foaming section bar is directly prepared by using a high-density polyethylane raw material in the presence of a physical gas foaming agent by the physical gas foaming method. The foaming density is 0.032-0.20g / cm<3>; the foaming ratio is 5-30 times; the average pore diameter of bubbles is 10-120 microns; the bubbles are uniformly distributed; the diameter difference of 95% bubbles is less than 15% the average pore diameter; the foaming section bar has no cortex construction and can be a material of any shape. The high foaming-ratio and high-density polyethylene microporous foaming section bar has advantages of high mechanical strength, good resilience, good hear resistance, good chemical corrosion resistance and recycling and reusing possibility of wastes, and can make up the defects of present foaming materials. The preparation method of the foaming product provided by the invention is easy to operate, has a simple process flow as well as a short production period, and is in favor of industrial production.

Description

Technical field: [0001] The invention relates to a high-expansion-ratio high-density polyethylene microcellular foaming profile and a preparation method thereof, belonging to the field of high polymer physical gas foaming. Background technique: [0002] Polymer foam material is a kind of aggregate formed by gas dispersed in solid polymer, which has the advantages of light weight, heat insulation, cushioning and insulation, so it has a wide range of applications in many fields. The currently used foaming methods mainly include chemical foaming and physical gas foaming. The chemical foaming method generally mixes the organic chemical foaming agent evenly into the polymer, heats it above the decomposition temperature of the foaming agent, causes it to decompose to generate a large amount of gas, and quickly releases the pressure to make the polymer foam. This method will leave undecomposed foaming agent in the foamed product, which will significantly affect the appearance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J9/14C08L23/06B29C41/52B29C47/92B29C44/60B29C48/92
Inventor 李文光虞晨阳吴炳田王亚
Owner 浙江博发新材料股份有限公司
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