Binary-particle retention-assisting drainability-assisting system for nano-cellulose and application method

A nano-cellulose and microparticle retention technology, which is applied in the direction of adding retention aids, can solve the problems of inability to effectively improve the water filtration performance of nano-cellulose, long dehydration time, and poor production efficiency, and achieve outstanding industrial application effects. , improve product quality and output, and reduce production costs

Active Publication Date: 2019-05-03
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size and hydrophilicity of nanocellulose, which is different from the properties of mineral filler particles added in traditional pulp, it will cause serious flocculation of nanocellulose, resulting in poor product uniformity; or making nanocellulose The retention rate of cellulose is reduced, resulting in increased production costs; or the water filtration performance of nanocellulose cannot be effectively improved, resulting in longer dehydration time and poor production efficiency
At present, there are no research reports on retention and drainage aids or related systems specifically applied to nanocellulose

Method used

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  • Binary-particle retention-assisting drainability-assisting system for nano-cellulose and application method
  • Binary-particle retention-assisting drainability-assisting system for nano-cellulose and application method
  • Binary-particle retention-assisting drainability-assisting system for nano-cellulose and application method

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Experimental program
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Effect test

Embodiment 1

[0030] Take 1 part of nanocellulose, 999 parts of deionized water, 0.0001 part of polyvinylpyrrolidone with a molecular weight of 100,000, stir for 1 min at a stirring speed of 1000 r / min, and add 0.002 parts of hectorite nanoparticles with a particle size of 200 nm. For hydrogel, stir for 1 min at a stirring speed of 1500 r / min, pour it into a G2 filter with a microporous membrane (pore diameter 0.65 μm), turn on vacuum filtration, and prepare a quantitative volume of about 30 g / m 2 The nanocellulose film, and then peel off the paper, using a hot press at 100 o After drying at C for 10 min, a transparent film of nanocellulose was obtained, the morphology of which was as follows figure 1 , figure 2 shown. After measurement, the water filtration time is 102 minutes, the retention rate is 82%, the light transmittance is 84%, and the haze is 73%.

Embodiment 2

[0032] Take 1 part of nanocellulose, 999 parts of deionized water, and 0.001 part of polyvinylpyrrolidone with a molecular weight of 1.5 million, stir for 1 min at a stirring speed of 1000 r / min, and add 0.002 parts of hectorite nanoparticles with a particle size of 10 nm. For hydrogel, stir for 1 min at a stirring speed of 1500 r / min, pour it into a G2 filter with a microporous membrane (pore diameter 0.65 μm), turn on vacuum filtration, and prepare a quantitative volume of about 30 g / m 2 The nanocellulose film, and then peel off the paper, using a hot press at 100 o C dried for 10min to obtain a nanocellulose transparent film with a morphology as figure 1 , figure 2 shown. After measurement, the water filtration time is 79 minutes, the retention rate is 94%, and the light transmittance is 89% (such as image 3 shown), the haze is 69%.

Embodiment 3

[0034] Take 1 part of nanocellulose, 999 parts of deionized water, and 0.003 parts of polyvinylpyrrolidone with a molecular weight of 216,000, stir for 1 min at a stirring speed of 1000 r / min, and add 0.002 parts of hectorite nanoparticles with a particle size of 20 nm. For hydrogel, stir for 1 min at a stirring speed of 1500 r / min, pour it into a G2 filter with a microporous membrane (pore diameter 0.65 μm), turn on vacuum filtration, and prepare a quantitative volume of about 30 g / m 2 The nanocellulose film, and then peel off the paper, using a hot press at 100 o After drying at C for 10 min, a transparent film of nanocellulose was obtained, the morphology of which was as follows figure 1 , figure 2 shown. After measurement, the water filtration time is 55 minutes, the retention rate is 95%, and the light transmittance is 91% (such as image 3 shown), the haze is 66%.

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Abstract

The invention discloses a binary-particle retention-assisting drainability-assisting system for nano-cellulose and an application method. The binary-particle retention-assisting drainability-assistingsystem is prepared from polyvinyl pyrrolidone and hectorite nano-aquagel. When in use, a relatively-dense flocculate is formed through firstly, adding the polyvinyl pyrrolidone into mixed slurry of paper pulp and the nano-cellulose, carrying out uniform stirring at a low speed to form relatively-loose micro-flocculates, then, adding the hectorite nano-aquagel, and carrying out stirring at a highspeed. According to the binary-particle retention-assisting drainability-assisting system, the drainability of the slurry can be obviously improved, and thus, the production efficiency is increased; and the retention rate of the nano-cellulose can also be increased, and thus, the evenness and mechanical properties of the product are improved.

Description

technical field [0001] The invention relates to a retention and drainage aid system for nanocellulose, in particular to a dual particle retention and drainage aid system for nanocellulose and its application in the preparation of cellulose membrane materials or in the process of papermaking . Background technique [0002] Cellulose is the most abundant renewable natural polymer resource in nature. Nanocellulose is a fiber aggregate with a diameter of less than 100 nm and a length of up to microns obtained by processing fibers chemically, physically, biologically, or a combination of them. It has excellent mechanical properties, large specific surface area, and good hydrophilicity. properties, high crystallinity, high transparency, low density, good biodegradability and biocompatibility, and stable chemical properties. Since a large number of hydroxyl groups are exposed on the surface of nanocellulose, it has great potential for chemical modification. In recent years, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/10
Inventor 李国栋刘温霞于得海王慧丽宋兆萍
Owner 山东济清科技服务有限公司
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