Method for preparing composite regenerated foam material by using waste EVA-based material

A technology of composite regeneration and foam materials, applied in recycling technology, plastic recycling, etc., can solve problems such as economic shocks, achieve easy operation, reduce material costs, and achieve better performance

Active Publication Date: 2022-02-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recycling and redistribution of used shoes to developing countries through reuse is also a common treatment method at present, but it usually brings inevitable impacts on the local economy

Method used

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  • Method for preparing composite regenerated foam material by using waste EVA-based material
  • Method for preparing composite regenerated foam material by using waste EVA-based material
  • Method for preparing composite regenerated foam material by using waste EVA-based material

Examples

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Embodiment 1

[0067] In this embodiment, a method for preparing a composite recycled foam material by using waste EVA-based materials mainly includes the following steps in parts by weight:

[0068] (1) After the waste EVA-based shoe sole foam products are pretreated by cleaning, they are processed and coarsely crushed to waste EVA-based materials with a particle size of 10-20 mm;

[0069] (2) Put the waste EVA-based material into a disc-shaped solid-phase mechanochemical reactor for grinding and pulverization. After the grinding is completed, collect the waste EVA-based ultrafine flake powder; wherein, the disc-shaped solid-phase mechanochemical reactor The process parameters are as follows: the grinding pressure is 0.5MPa, the grinding surface temperature of the grinding disc is controlled by feeding a constant temperature circulating liquid medium with a temperature of -16°C, 12 cycles of grinding, and the grinding disc rotates at 45 rpm;

[0070] (3) Put 20 parts of waste EVA-based ultr...

Embodiment 2

[0074] In this embodiment, a method for preparing a composite recycled foam material by using waste EVA-based materials mainly includes the following steps in parts by weight:

[0075] (1) After the waste EVA-based shoe sole foam products are pretreated by cleaning, they are processed and coarsely crushed to waste EVA-based materials with a particle size of 10-20 mm;

[0076] (2) Put the waste EVA-based material into a disc-shaped solid-phase mechanochemical reactor for grinding and pulverization. After the grinding is completed, collect the waste EVA-based ultrafine flake powder; wherein, the disc-shaped solid-phase mechanochemical reactor The process parameters are as follows: the grinding pressure is 0.4MPa, the grinding surface temperature of the grinding disc is controlled by feeding a constant temperature circulating liquid medium with a temperature of -14°C, 10 cycles of grinding, and the grinding disc rotates at a speed of 45 rpm;

[0077] (3) Put 20 parts of waste EVA...

Embodiment 3

[0116] In this embodiment, a method for preparing a composite recycled foam material by using waste EVA-based materials mainly includes the following steps in parts by weight:

[0117] (1) After the waste EVA-based shoe sole foam products are pretreated by cleaning, they are processed and coarsely crushed to waste EVA-based materials with a particle size of 10-20 mm;

[0118] (2) Put the waste EVA-based material into a disc-shaped solid-phase mechanochemical reactor for grinding and pulverization. After the grinding is completed, collect the waste EVA-based ultrafine flake powder; wherein, the disc-shaped solid-phase mechanochemical reactor The process parameters are as follows: the grinding pressure is 0.8MPa, the temperature of the grinding surface of the grinding disc is controlled by feeding a constant temperature circulating liquid medium with a temperature of -10°C, 10 cycles of grinding, and the grinding disc rotates at a speed of 50 rpm;

[0119] (3) Put 22 parts of wa...

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Abstract

The invention provides a method for preparing a composite regenerated foam material by using a waste EVA-based material. The method is characterized in that waste EVA-based superfine flaky powder is obtained under adaptive conditions by using a solid-phase shearing and grinding technology and further limiting grinding process parameters, the waste EVA-based superfine flaky powder and TPU are blended and compounded, and further the TPU / waste EVA-based composite foam material is prepared by using a supercritical carbon dioxide foaming technology. According to the method, the particle size and particle size distribution of the waste EVA-based powder are greatly reduced, and the surface activity of the powder is further improved through the flaky morphology, wherein compared with granular or strip-shaped powder, the flaky powder has the advantages that melt blending and compounding with TPU are further improved, and finally, a TPU / waste EVA-based composite foam material / product with higher performance is prepared by combining a supercritical carbon dioxide foaming technology.

Description

technical field [0001] The invention belongs to the technical field of waste EVA-based material recycling, and relates to a method for preparing composite recycled foam materials by using waste EVA-based materials, especially aimed at utilizing the mechanochemical reactor disclosed in Chinese authorized patent ZL 95111258.9 for waste EVA-based materials, especially Foam material is processed. Background technique [0002] EVA is a copolymer of ethylene and acetic acid. The Chinese chemical name: ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer), and the English chemical name: Ethylene Vinyl Acetate Copolymer. EVA is widely used in a wide range of fields, and the global market consumption is increasing every year, especially in the shoe industry, where it is used in the soles and interior materials of middle and high-end travel shoes, hiking shoes, slippers, and sandals. [0003] The rapid development of society makes people's demand for footwear products i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/04B29C35/02B29C44/34B29C44/60B29B9/06
CPCB29B17/0404B29C44/60B29C44/35B29B9/06B29C35/02Y02W30/62
Inventor 李莉刘兆港郭武
Owner SICHUAN UNIV
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