Foaming process for TPU (thermoplastic polyurethane) granular material

A particle material and process technology, applied in the field of TPU particle material foaming process, can solve the problems of high hardness, poor shock absorption performance, heavy weight of TPU raw materials, etc., and achieve the effects of high softness, strong air permeability and light weight

Pending Publication Date: 2015-10-21
NINGBO GMF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses a foaming process of TPU granular materials, which can overcome the shortcomings of TPU raw materials such as heavy weight, high hardness, and poor shock absorpt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the foaming process of the TPU granular material is to place the TPU granular material pretreated in the material preparation stage in a container, inject supercritical carbon dioxide, keep the pressure of supercritical carbon dioxide at 15MPa, and the temperature at 43°C to make the supercritical Carbon dioxide penetrates into the TPU particles, and finally the supercritical carbon dioxide in the TPU particles reaches an equilibrium state, becoming a pressurized material; the pressurized material maintains the temperature and pressure for 1 hour, and then removes the pressure of the pressurized material, and the pressure release rate is 17MPa / min; Then the granular material is heated and foamed, the foaming condition is a temperature of 180°C, and the foaming time is 1min; the foamed granular material is screened (by the specific gravity method, and the specific gravity of the granular material with a similar foaming ratio is similar. performance is ...

Embodiment 2

[0043] In this example, the foaming process of the TPU granular material is to place the TPU granular material pretreated in the material preparation stage in a container, inject supercritical carbon dioxide, keep the pressure of supercritical carbon dioxide at 12MPa, and the temperature at 37°C to make the supercritical Carbon dioxide penetrates into the TPU particles, and finally the supercritical carbon dioxide in the TPU particles reaches an equilibrium state, becoming a pressurized material; the pressurized material maintains the temperature and pressure for 15 hours, and then removes the pressure of the pressurized material, and the pressure release rate is 22MPa / min; Then the granular material is heated and foamed, the foaming condition is a temperature of 100°C, and the foaming time is 10 minutes; the foamed granular material is screened (by the specific gravity method, the specific gravity of the granular material with a similar foaming ratio is similar, performance is...

Embodiment 3

[0045]In this embodiment, the foaming process of the TPU granular material is to place the TPU granular material pretreated in the material preparation stage in a container, inject supercritical carbon dioxide, keep the pressure of supercritical carbon dioxide at 8MPa, and the temperature at 35°C to make the supercritical Carbon dioxide penetrates into the TPU particles, and finally the supercritical carbon dioxide in the TPU particles reaches an equilibrium state, becoming a pressurized material; the pressurized material maintains the temperature and pressure for 5 hours, and then removes the pressure of the pressurized material, and the pressure release rate is 12MPa / min; Then the granular material is heated and foamed, and the foaming condition is a temperature of 120°C, and the foaming time is 8 minutes; the foamed granular material is screened (by the specific gravity method, and the specific gravity of the granular material with a similar foaming ratio is similar, perform...

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PUM

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Abstract

The invention discloses a foaming process for a TPU (thermoplastic polyurethane) granular material. The process comprises the following steps: a material preparation stage and a foaming stage, wherein the foaming stage comprises supercritical fluid pressurizing, pressure maintaining and pressure relieving and foaming; supercritical fluid pressurizing means pressurizing the TPU material granules to be saturated and stable through a supercritical fluid; pressure maintaining means maintaining the pressure after being stable to obtain a pressurized material; pressure relieving and foaming means relieving the pressure of the pressurized material and heating and forming the pressurized material to obtain foamed granules, wherein the temperature is 70-180 DEG C and the foaming time is 1-10 minutes. According to the technical scheme disclosed by the invention, the defect that the TPU raw material is great in weight, high in hardness, poor in vibration reducing performance and the like. The foamed product has the advantages of being green and environmental-friendly, high in wear and fold resistance, light in weight, high in elasticity, hydrolytic resistant, chemical resistant, oil resistant, ultraviolet resistant and good in applicability.

Description

technical field [0001] The invention mainly relates to a thermoplastic foaming process, in particular to a TPU granular material foaming process. Background technique [0002] TPU has high modulus, high strength, high elongation and high elasticity, excellent wear resistance, oil resistance, low temperature resistance and aging resistance. At the same time, it is increasingly popular because of its environmental protection concept. With Beijing's successful bid to host the 2008 Olympic Games, more and more Chinese people are keen on various sports, and high-performance sports shoes have become a hot commodity. As the fourth-generation sole material after rubber, PVC, and SBS, TPU (thermoplastic polyurethane elastomer) has better elasticity, wear resistance, tear resistance, and bending properties, and is a variety of special shoes with extremely high requirements. It is one of the preferred materials for soles of football shoes, skate shoes, hiking shoes, etc. [0003] Al...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L75/04
Inventor 秦柳陈承涛张艳娜虞华春
Owner NINGBO GMF TECH
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