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Waste leather superfine fiber and its high electromagnetic shielding material composited with polyvinyl alcohol and their preparation method

A superfine fiber, polyvinyl alcohol technology, applied in chemical instruments and methods, magnetic field/electric field shielding, fiber processing, etc., can solve the problems of high degree of protein fiber bundles, composite modification, inability to melt, etc., to achieve adaptability Excellent, good flexibility, no secondary pollution effect

Active Publication Date: 2022-05-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the collagen in LSW cannot melt after being heated due to its cross-linked structure and other characteristics, and it is difficult to shape it by general physical methods. At the same time, the overall structure of LSW is compact, and the degree of protein fiber bundles is high. Because of its large size, it is difficult to achieve composite with traditional polymer materials. Modification, this is the main problem faced by large-scale processing of LSW by physical methods

Method used

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  • Waste leather superfine fiber and its high electromagnetic shielding material composited with polyvinyl alcohol and their preparation method
  • Waste leather superfine fiber and its high electromagnetic shielding material composited with polyvinyl alcohol and their preparation method
  • Waste leather superfine fiber and its high electromagnetic shielding material composited with polyvinyl alcohol and their preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Put the tanning solid waste into the disc-shaped mechanochemical reactor, and feed circulating cooling water at the same time, control the temperature of the disc surface to 35°C, control the pressure to 20kN, control the speed to 400 rpm, control vacuum feeding, and circulate grinding 9 times to get waste leather microfibers, the average fiber diameter of the ultrafine fibers is 2 μm, and the average length is 100 μm;

[0040] 2) 100 parts of polyvinyl alcohol 1799 (that is, the degree of polymerization is 1700, and the degree of alcoholysis is 99%) is heated and dissolved in hot water at 95 ° C to obtain a polyvinyl alcohol solution with a concentration of 20 wt%, and then mixed with 5 parts of glycerin and 200 parts Mix waste leather microfibers, then drop 0.3wt% polyvinyl alcohol defoamer BK-802 into the mixed suspension, and use a high-speed stirrer to mix and stir for 20 minutes;

[0041] 3) Put the obtained mixed liquid into an ultrasonic device with a power o...

Embodiment 2

[0046] 1) Put the tanning solid waste into the disc-shaped mechanochemical reactor, and feed circulating cooling water at the same time, control the temperature of the disc surface to 20°C, control the pressure to 17kN, control the speed to 300 rpm, control the vacuum feeding, and circulate the grinding 8 times to get the waste leather superfine fiber, the average fiber diameter of the superfine fiber is 5 μm, and the average length is 500 μm;

[0047] 2) Heat and dissolve 100 parts of polyvinyl alcohol 2597 in hot water at 80°C to obtain a polyvinyl alcohol solution with a concentration of 10 wt%, then mix it with 10 parts of urea and 400 parts of waste leather microfiber, and then mix it in the mixed suspension Add 0.1wt% polyvinyl alcohol defoamer DF-898 dropwise, and use a high-speed stirrer to mix and stir for 10 minutes;

[0048] 3) Put the obtained mixed liquid into an ultrasonic device with a power of 800W for 10 minutes at room temperature, and then stir and defoam at...

Embodiment 3

[0053] 1) Put the tanning solid waste into the disc-shaped mechanochemical reactor, and feed circulating cooling water at the same time, control the temperature of the disc surface to 5°C, control the pressure to 15kN, control the speed to 100 rpm, control the vacuum feeding, and circulate the grinding 7 times to get the waste leather superfine fiber, the average fiber diameter of the superfine fiber is 8 μm, and the average length is 800 μm;

[0054] 2) Heat and dissolve 100 parts of polyvinyl alcohol 1799 in hot water at 90°C to obtain a polyvinyl alcohol solution with a concentration of 10 wt%, then mix it with 10 parts of caprolactam and 200 parts of waste leather microfiber, and then mix it in the mixed suspension Add 0.1wt% polyvinyl alcohol defoamer GPE-3000 dropwise, and mix with a high-speed stirrer for 10 minutes;

[0055] 3) Put the obtained mixed liquid into an ultrasonic device with a power of 700W at room temperature for ultrasonic treatment for 20 minutes, and t...

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Abstract

The invention discloses waste leather microfibers and their high electromagnetic shielding materials composited with polyvinyl alcohol and their preparation methods. The high electromagnetic shielding materials are firstly added to solid-phase mechanochemical reaction of tanning solid waste (LSW) Circular milling in the machine, then mix the obtained waste leather microfiber with polyvinyl alcohol, cast it into a film, then immerse the film in the electroless plating solution for surface silver plating reaction, lay it flat and air dry, or Then bonded into a multi-layer composite material. The method of the invention can not only crush the tanning solid waste into superfine and loose short fibers, which can be well compounded with polyvinyl alcohol, but also maintain the dissipation effect of the leather collagen fiber on electromagnetic waves, and the high efficiency of the silver-plated layer on the surface The reflection effect enables the obtained composite material to exhibit excellent electromagnetic shielding performance, realize high-value recycling of LSW, and also have the advantages of simple operation, energy saving, low pollution, low cost, and easy large-scale production.

Description

technical field [0001] The invention belongs to the technical field of recycled waste leather and its composite materials and recycling preparation, and specifically relates to a waste leather superfine fiber and a high electromagnetic shielding material compounded with polyvinyl alcohol and a preparation method thereof. Background technique [0002] As a widely used bio-based material, animal skin has good strength, toughness and texture, and plays a vital role in human life (Talib, Romli et al. 2018). However, the leather manufacturing industry still faces inefficiencies, the fact that only one in five raw materials is successfully converted into finished leather, and the by-product tanning solid waste (LSW) is simply disposed of as waste, including direct filling. Buried or incinerated (Pati, Chaudhary et al. 2014, Mella, Benvenuti et al. 2019). To be clear, simple landfilling and incineration not only ignores the value of biological collagen fibers in leather, but more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01G11/00C08L29/04C08L89/06C08J5/18C23C18/44B32B9/02B32B9/04B32B27/30B32B27/06B32B27/12B32B7/12B32B27/22B32B27/18B32B33/00H05K9/00
CPCD01G11/00C08J5/18C23C18/44C23C18/1641B32B5/02B32B5/26B32B27/306B32B27/08B32B27/12B32B7/12B32B27/22B32B27/18B32B33/00H05K9/0084C08J2329/04C08J2489/06B32B2262/08B32B2307/558B32B2307/212Y02W30/66
Inventor 李怡俊曾书龙白时兵刘博瀚张桐瑞
Owner SICHUAN UNIV
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