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Easy-demoulding step-by-step controllable foaming method for preparation of TPU foam material

A foaming material and easy demoulding technology, applied in the field of thermoplastic polyurethane micro-foaming materials, can solve the problems of large mold wall, difficult demoulding, stickiness, etc., to improve performance degradation, easy demoulding, and reduce strength loss Effect

Inactive Publication Date: 2017-08-22
苏州诚和成新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the thermal expansion of the expanded particles after thermoforming during the application process, it is difficult to demould, and a large sticking phenomenon occurs with the mold wall.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix TPU particles with crosslinking agent dicumyl peroxide, antioxidant 2,6-tertiary butyl-4-methylphenol, antistatic agent alkylsulfonic acid alkali metal salt, mold release agent methyl silicone oil , the addition amount is respectively 0.2wt%, 0.5wt%, 0.05wt%, 0.01wt%, the TPU particles after mixing are put into the extruder, melted and blended and pelletized into pre-expanded particles.

[0022] Put the pre-expanded particles into the closed high-pressure mold, the amount added is 1 / 30 of the cavity volume, and the supercritical CO 2 , heated to make supercritical CO 2 The fluid is dissolved in the foamed particles, kept at constant temperature and pressure for a period of time and reaches the saturation of the solution, supercritical CO 2 The injection amount is 5wt%, the pressure is 20MPa, the mold temperature is 160°C, and the constant temperature and pressure holding time is 20 minutes.

[0023] After the constant temperature and pressure holding, the mold is ...

Embodiment 2

[0026] TPU particles and crosslinking agent 2,5-dimethyl-2,5 bis(tert-butyl peroxy)hexane, antioxidant bis(3,5-tertiary butyl-4-hydroxyphenyl)sulfur Ether, antistatic agent dithiocarbamic acid alkali metal salt, release agent microcrystalline paraffin mixed, the addition amount is respectively 0.3wt%, 0.8wt%, 0.1wt%, 0.05wt%, the TPU particle after mixing is added The extruder melt blends and pelletizes into pre-expanded particles.

[0027] Put the pre-expanded particles into the closed high-pressure mold, the amount added is 1 / 10 of the cavity volume, and the supercritical CO 2 , heated to make supercritical CO 2 The fluid is dissolved in the foamed particles, kept at constant temperature and pressure for a period of time and reaches the saturation of the solution, supercritical CO 2 The injection amount is 10wt%, the pressure is 17MPa, the mold temperature is 175°C, and the constant temperature and pressure holding time is 30 minutes.

[0028] After the constant temperatu...

Embodiment 3

[0031] Mix TPU particles with crosslinking agent 2,5-dimethyl-2,5 bis(tert-butyl peroxy)hexane and dicumyl peroxide, antioxidant bis(3,5-tertiary butyl -4-hydroxyphenyl) sulfide and 2,6-tertiary butyl-4-methylphenol mixture, antistatic agent dithiocarbamate alkali metal salt and alkylsulfonic acid alkali metal salt mixture, mold release The mixture of microcrystalline paraffin and methyl silicone oil is mixed, and the addition amount is 0.4wt%, 1.0wt%, 0.15wt%, 0.15wt%, and the mixed TPU particles are added to the extruder, melted and blended, and pelletized into pre- foam particles.

[0032] Put the pre-expanded particles into the closed high-pressure mold, the amount added is 1 / 3 of the cavity volume, and the supercritical CO 2 , heated to make supercritical CO 2 The fluid is dissolved in the foamed particles, kept at constant temperature and pressure for a period of time and reaches the saturation of the solution, supercritical CO 2 The injection amount is 20wt%, the pre...

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PUM

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Abstract

The invention relates to an easy-demoulding step-by-step controllable foaming method for preparation of a TPU foam material, comprising the following steps: (1) mixing TPU particles with a cross-linking agent, an antioxidant, an antistatic agent and a mold release agent, adding the mixed TPU particles into an extruder for melt blending and pelletizing to obtain prefoam particles; (2) putting the prefoam particles into an enclosed high-pressure mold, dissolving a supercritical fluid in the foam particles to be saturated through supercritical fluid heating; (3) moving the mold step by step into a pressure container equipped with an ultrasonic unit at different temperatures and pressures and releasing the supercritical fluid step by step until pressure and temperature inside and outside the mold are balanced, and gradually foaming the foam particles at different pressures and temperatures in an ultrasonic environment; and (4) quenching the mold which meets the foaming requirement, and rapidly releasing pressure so as to obtain a foam TPU material. The method can conveniently and effectively control required foaming pore diameter and foaming ratio. The process is simple and pollution-free, and the method is more effectively. The TPU foam particles with expected quality and specification can be prepared accurately according to needs.

Description

technical field [0001] The invention belongs to the field of thermoplastic polyurethane (TPU) micro-foaming materials, and in particular relates to a method for preparing TPU foaming materials by step-by-step controllable foaming with easy demoulding. Background technique [0002] TPU has excellent wear resistance, chemical corrosion resistance, high resilience and is used in shoe materials. TPU foam material not only has the above advantages of TPU resin, but also has the advantages of light weight, softness and high resilience, so it is used in the field of new high-performance sports shoes. [0003] The method for preparing TPU foam material includes physical foaming method and chemical foaming method. In traditional methods, chlorofluorocarbons and flammable hydrocarbons, which are harmful to the ozone layer, are often used as physical blowing agents. With the improvement of people's awareness of environmental protection, the use of clean, cheap and environmentally fri...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L75/04C08L83/04C08L91/06C08K5/00C08K5/14C08K5/13C08K5/42C08K5/375C08K5/39
CPCC08J9/122C08J2203/06C08J2203/08C08J2375/04C08J2483/04C08J2491/06C08K2201/014C08K2201/017C08L75/04C08L2205/03C08L83/04C08K5/14C08K5/13C08K5/42C08L91/06C08K5/375C08K5/39C08K5/00
Inventor 马立胜陈海风李春芳
Owner 苏州诚和成新材料科技有限公司
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