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Discarded leather superfine fiber, high electromagnetic shielding material combined with discarded leather superfine fiber and polyvinyl alcohol and preparation methods of discarded leather superfine fiber and high electromagnetic shielding material

A technology of ultra-fine fiber and polyvinyl alcohol, which is applied in chemical instruments and methods, magnetic field/electric field shielding, fiber treatment, etc., can solve the problems of high degree of protein fiber bundles, compound modification, and inability to melt, and achieve low cost , good flexibility, and the effect of inhibiting foaming

Active Publication Date: 2020-07-17
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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  • Discarded leather superfine fiber, high electromagnetic shielding material combined with discarded leather superfine fiber and polyvinyl alcohol and preparation methods of discarded leather superfine fiber and high electromagnetic shielding material
  • Discarded leather superfine fiber, high electromagnetic shielding material combined with discarded leather superfine fiber and polyvinyl alcohol and preparation methods of discarded leather superfine fiber and high electromagnetic shielding material
  • Discarded leather superfine fiber, high electromagnetic shielding material combined with discarded leather superfine fiber and polyvinyl alcohol and preparation methods of discarded leather superfine fiber and high electromagnetic shielding material

Examples

Experimental program
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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 a discarded leather superfine fiber, a high electromagnetic shielding material combined with the discarded leather superfine fiber and polyvinyl alcohol and preparation methodsof the discarded leather superfine fiber and the high electromagnetic shielding material. The high electromagnetic shielding material is prepared in the way that leather-manufacturing solid waste (LSW) is added into a solid phase force chemical reactor for circulation grinding at first; then the obtained discarded leather superfine fiber and the polyvinyl alcohol are mixed in a fusion mode, and casting is performed to form films; and afterwards, film pieces are dipped into a chemical plating solution to be subjected to surface silvering reacting, flattening and air drying are also conducted,or the film pieces are spliced into a multilayer composite material. By adoption of the method, the LSW can be smashed into superfine loose short fibers which can be well compounded with the polyvinylalcohol, the dissipation effect on electromagnetic waves by leather collagenous fibers can be kept, the obtained composite material can show excellent electromagnetic shielding performance with the help of the high-efficiency reflection action of a surface silvered layer, and high-value recycling of the LSW is realized; and moreover, the advantages that operation is simple and convenient, energycan be saved, pollution is small, cost is low and mass production can be facilitated are achieved.

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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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 李怡俊白时兵曾书龙刘博瀚张桐瑞
Owner SICHUAN UNIV
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