Preparation process of foaming product and foaming product

A preparation process and technology for foaming products, which is applied in the field of polymer material processing, can solve the problems of destroying the internal structure of elastomers, blurring the three-dimensional structure of the surface, and low foaming ratio, and achieves excellent performance, fine surface structure, and high foaming ratio. big effect

Active Publication Date: 2020-04-10
SHINCELL NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is to overcome the low foaming ratio of thermoplastic elastomers such as thermoplastic polyurethane, thermoplastic polyester and thermoplastic nylon elastomer in the prior art when preparing surface three-dimensional structure foamed products, and traditional methods will destroy The internal structure of this type of elastomer may cause defects in the surface three-dimensional structure and poor stability, thus providing a process for preparing foamed products with a surface three-dimensional structure by one-step molding

Method used

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  • Preparation process of foaming product and foaming product
  • Preparation process of foaming product and foaming product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing a foamed product, specifically a sports shoe midsole with a pattern on the surface, comprising the following steps:

[0034] (1) According to the external dimensions of the midsole of the sports shoes to be prepared, use breathable steel to process and manufacture molds with the same internal cavity external dimensions and surface patterns after mirror conversion;

[0035] (2) Select hardness as 85A, melting point as 165°C and density as 1.15g / cm 3 The TPU resin is used as the material, and the solid foaming body is prepared by injection molding. The injection temperature is 200°C, the mold temperature is 80°C, and the injection speed is 20cm 3 / s.

[0036] (3) Put the solid foaming embryo into the mold, and impregnate it with supercritical fluid for 150 minutes at 160°C and 15MPa, in which the volume ratio of carbon dioxide and nitrogen is 10Mpa, and then release the pressure at a rate of 5MPa / s. The foamed embryo body ...

Embodiment 2

[0038] This embodiment provides a method for preparing a foamed product, specifically a sports shoe midsole with a pattern on the surface, comprising the following steps:

[0039] (1) According to the external dimensions of the midsole of the sports shoes to be prepared, use breathable steel to process and manufacture molds with the same internal cavity external dimensions and surface patterns after mirror conversion;

[0040] (2) Select hardness as 98A, melting point as 160°C and density as 1.07g / cm 3The TPEE resin is used as the material, and the solid foaming body is prepared by injection molding. The injection temperature is 205°C, the mold temperature is 90°C, and the injection speed is 30cm 3 / s.

[0041] (3) Put the solid foaming embryo into the mold, and impregnate it with supercritical fluid for 20 minutes at 155°C and 25MPa, in which the volume ratio of carbon dioxide and nitrogen is 4:1, and then release the pressure at a rate of 1MPa / s , the solid foaming embryo ...

Embodiment 3

[0043] This embodiment provides a method for preparing a foamed product, specifically a sports shoe midsole with a pattern on the surface, comprising the following steps:

[0044] (1) According to the external dimensions of the midsole of the sports shoes to be prepared, use breathable steel to process and manufacture molds with the same internal cavity external dimensions and surface patterns after mirror conversion;

[0045] (2) Select hardness as 94A, melting point as 170°C and density as 1.02g / cm 3 The TPAE resin is used as the material, and the solid foaming body is prepared by injection molding. The injection temperature is 210°C, the mold temperature is 70°C, and the injection speed is 30cm 3 / s;

[0046] (3) Put the solid foaming embryo body into the mold, and pass supercritical N 2 Immerse for 80 minutes, and then release the pressure at a rate of 1000MPa / s. The solid foaming body expands and foams, and forms thermal pressure when it contacts the inner wall of the m...

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Abstract

The invention discloses a preparation process of a foaming product. The preparation process comprises the following steps: first, preparing a solid foaming blank; and then, putting the solid foaming blank into a closed space, introducing supercritical fluid for dipping, and relieving pressure to foam the solid foaming blank until the solid foaming blank is completely attached to the inner side ofthe closed space to obtain a foaming product. The invention also discloses a foaming product prepared by the process. According to the invention, the solid foaming blank is foamed in a mold, and whenthe solid foaming blank expands to be in contact with the inner wall of the mold, the expansion is limited, and thermal pressure is formed between the solid foaming blank and the inner wall of the mold, so that the shape of the inner wall of the mold is formed on the surface of the solid foaming blank, and according to the characteristics of thermoplastic elastomers such as thermoplastic polyurethane, thermoplastic polyester and thermoplastic nylon elastomers, density increase and elastic performance reduction caused by shrinkage of the foaming material due to secondary mold pressing are avoided. The mold is used for controlling the surface structure of the foaming material, the size accuracy is improved, the surface structure of the foaming product is fine, and the problems of blurring and poor stability are solved.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a preparation process and a preparation method of a foamed product. Background technique [0002] Thermoplastic polyurethane (TPU), thermoplastic polyester (TPEE), thermoplastic nylon elastomer (TPAE) and other high-performance thermoplastic elastomers, the main chain of which is composed of soft segments whose glass transition temperature is lower than room temperature and glass transition temperature higher than room temperature It is formed by block of hard segment. Due to the strong polarity and strong mutual attraction of the hard segment, the hard segment and the soft segment have a tendency to spontaneously separate in thermodynamics, and the hard segment gathers together to form many microdomains, which are distributed in the soft segment phase, thus forming two phase separation structure. The crystalline structure and strong hydrogen bonding force formed in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L75/04C08L67/00C08L77/00
CPCC08J9/122C08J2203/06C08J2203/08C08J2205/052C08J2375/04C08J2367/00C08J2377/00
Inventor 姜修磊李期筠余加保葛鑫奇
Owner SHINCELL NEW MATERIAL CO LTD
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