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Method for preparing thermoplastic elastomer foamed beads

A technology of thermoplastic elastomer and foamed beads, which is applied in the field of preparing thermoplastic elastomer foamed beads

Inactive Publication Date: 2017-09-19
HANGZHOU BOSTE NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the air diffuses further into the bubbles, the pressure inside the bubbles gradually increases until the internal and external pressures are equal, and the volume of the beads will be partially recovered, but the volume of the bubbles is still much smaller than when the expansion is completed. The recovery process has become an important reason for limiting the availability of thermoplastic elastomer foam materials with higher expansion ratios

Method used

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  • Method for preparing thermoplastic elastomer foamed beads
  • Method for preparing thermoplastic elastomer foamed beads
  • Method for preparing thermoplastic elastomer foamed beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: be 80,000 by 100g average molecular weight, the thermoplastic polyurethane elastomer (TPU) bead of 3mm in average diameter, drop in the autoclave under the normal temperature and seal the autoclave, open the inlet valve, pass into nitrogen, make The thermoplastic polyurethane elastomer beads were saturately impregnated at room temperature for 10 hours in a nitrogen atmosphere of 15 MPa.

[0028] Slowly discharge the nitrogen pressure in the autoclave, open the autoclave, take out the thermoplastic polyurethane elastomer beads that have absorbed nitrogen, put them into another autoclave that has reached the set foaming temperature of 150°C, seal the autoclave, and Inject 10MPa supercritical carbon dioxide and keep the pressure for 10 minutes. Quickly open the exhaust valve to remove the carbon dioxide gas in the autoclave, causing the nucleation and growth of cells in the thermoplastic polyurethane elastomer matrix, quickly open the autoclave, and take out ...

Embodiment 2

[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thermoplastic polyurethane elastomer beads are immersed in a 10MPa nitrogen atmosphere at room temperature for 15 hours, the foaming temperature is 100°C, the foaming pressure is 7MPa, and the foaming pressure time is 12 minutes .

Embodiment 3

[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the thermoplastic polyurethane elastomer beads are immersed in a nitrogen atmosphere of 20 MPa at room temperature for 5 hours, the foaming temperature is 180 ° C, the foaming holding pressure is 8 MPa, and the foaming holding time is 7 minutes .

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PUM

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Abstract

The invention discloses a method for preparing thermoplastic elastomer foamed beads. According to the method, carbon dioxide and nitrogen mixed gas can be retained inside foamed bead bubbles, so that volume shrinkage of the foamed bead bubbles in the air exchange process is inhibited, and large expansion ratio is maintained. The method includes the steps: dipping thermoplastic elastomer beads in high-pressure nitrogen atmosphere at normal temperature; placing the thermoplastic elastomer beads sufficiently absorbing nitrogen in carbon dioxide in a super-critical state, performing swelling diffusion and inducing the thermoplastic elastomer beads dissolving the nitrogen and the carbon dioxide to expand in a foaming manner to prepare the thermoplastic elastomer foamed beads. The nitrogen and carbon dioxide mixed gas is retained inside the thermoplastic elastomer foamed beads, a bubble structure is supported by nitrogen molecules in the bubbles in the process of gas exchange with external air in a natural environment, and high product foaming ratio is maintained.

Description

technical field [0001] The invention relates to a method for preparing thermoplastic elastomer foamed beads, in particular to a method for preparing high-magnification thermoplastic elastomer foamed beads by using clean foaming gas. Background technique [0002] Thermoplastic elastomers not only have excellent elasticity similar to rubber, but also have the processing performance of general thermoplastics. Through the physical foaming process, a large number of bubbles are introduced into the thermoplastic elastomer matrix to form a thermoplastic elastomer foam material, which has the characteristics of light weight, soft touch, high elasticity, small permanent compression deformation, clean and environmentally friendly, and recyclable. Widely used in shoe materials, sporting goods, automotive interiors, electronic devices, etc. [0003] By using a physical foaming agent to form thermoplastic elastomer foamed beads first, and then steam forming in the mold, the surface of t...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L75/04C08L77/00C08L23/08C08L67/00
Inventor 余加保陆炜唐云
Owner HANGZHOU BOSTE NEW MATERIALS TECH CO LTD
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