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A kind of preparation method of water-dispersed aramid fiber nanofiber/nanocellulose composite system and ultraviolet shielding transparent film

A nanocellulose and nanofiber technology, which is applied in the field of composite materials, can solve the problems of narrow ultraviolet absorption band, low transparency, and difficult dispersion, etc., and achieves the effects of good ultraviolet shielding effect, simple preparation process, and breakthrough in poor compatibility.

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a water-dispersed aramid nanofiber / nanocellulose composite system and an ultraviolet shielding transparent film, so as to overcome the above-mentioned defects in the prior art. The present invention effectively solves the problem of ultraviolet shielding at present. The technical problems of the material are low transparency, difficult to disperse, narrow ultraviolet absorption band, toxic and difficult to degrade

Method used

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  • A kind of preparation method of water-dispersed aramid fiber nanofiber/nanocellulose composite system and ultraviolet shielding transparent film
  • A kind of preparation method of water-dispersed aramid fiber nanofiber/nanocellulose composite system and ultraviolet shielding transparent film
  • A kind of preparation method of water-dispersed aramid fiber nanofiber/nanocellulose composite system and ultraviolet shielding transparent film

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preparation example Construction

[0037] A preparation method of water-dispersed aramid nanofiber / nanocellulose composite system includes the following steps:

[0038] (1) Place the para-aramid fiber X, potassium hydroxide, and dimethyl sulfoxide in a container, stir and disperse to obtain the aramid nanofiber dispersion A dispersed in the KOH / DMSO system;

[0039] Wherein, the ratio of para-aramid fiber X, KOH and DMSO is 1g:1.5g:500mL; said stirring refers to stirring under a sealed condition at a temperature of 30-60°C for 5-8 days; Aramid fiber X is one of para-aramid yarn fibers, para-aramid chopped fibers, para-aramid pulp fibers and para-aramid fibrids;

[0040] (2) Dilute the aramid nanofibers dispersed in the KOH / DMSO system obtained in step (1) to obtain a uniformly dispersed aramid nanofiber dispersion B;

[0041] Among them, the diluent is DMSO, and the volume concentration of the aramid nanofiber dispersion after dilution is 0.1 mg / mL;

[0042] (3) Add nano cellulose Y to deionized water for stirring and d...

Embodiment 1

[0065] (1) Place 1g of para-aramid yarn fibers, 1.5g of potassium hydroxide and 500ml of dimethyl sulfoxide in a container, and stir for 8 days at 30°C under sealed conditions to obtain dispersion in KOH / DMSO Aramid nanofiber dispersion A under the system;

[0066] (2) Dilute the aramid nanofibers dispersed in the KOH / DMSO system obtained in step (1) with DMSO to obtain an aramid nanofiber dispersion B with an average volume concentration of 0.1 mg / mL;

[0067] (3) Add deionized water to the nanocellulose obtained by the chemical acid hydrolysis and stir for 12 hours at a stirring speed of 1000 rpm to obtain a uniformly dispersed nanocellulose suspension C with a mass concentration of 1%;

[0068] (4) The nanocellulose suspension C obtained in step (3) is injected into the aramid nanofiber dispersion obtained in step (2) under high pressure at a stirring speed of 600 rpm, and the aramid nanofibers are mixed with The mass ratio of nano cellulose is 1:100, the jet pressure is 5MPa, an...

Embodiment 2

[0078] (1) Place 1.0g of para-aramid chopped fiber, 1.5g of potassium hydroxide and 500ml of dimethyl sulfoxide in a container, and stir at 40°C for 7 days under sealed conditions to obtain a dispersion in KOH / Aramid nanofiber dispersion A under DMSO system;

[0079] (2) Dilute the aramid nanofibers dispersed in the KOH / DMSO system obtained in step (1) with DMSO to obtain an aramid nanofiber dispersion B with an average volume concentration of 0.1 mg / mL;

[0080] (3) The nanocellulose obtained by chemical pretreatment and mechanical treatment was added to deionized water and stirred for 12 hours at a stirring speed of 1000 rpm to obtain a uniformly dispersed nanocellulose suspension C with a mass concentration of 1%;

[0081] (4) The nanocellulose suspension C obtained in step (3) is injected into the aramid nanofiber dispersion obtained in step (2) under high pressure at a stirring speed of 1000 rpm, and the aramid nanofibers are mixed with The mass ratio of nano cellulose is 3:10...

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Abstract

The invention discloses a preparation method of a water-dispersible aramid nanometer fiber / nanometer cellulose composite system and an ultraviolet shielding type transparent thin film. The preparationmethod comprises the following steps of firstly, adding a small amount of aramid nanometer fibers with excellent thermodynamics stability property and ultraviolet shielding property; uniformly mixingand dispersing the nanometer cellulose and the aramid nanometer fibers by high-speed shearing and re-dispersing; degassing by ultrasonic waves, sucking and filtering under the vacuum condition, drying at low temperature, and the like, so as to obtain the ultrasonic shielding type transparent thin film with certain transparency. The preparation method has the advantages that the natural plant fibers are used as the basic raw material, so that the production cost is reduced, and the problems of poison, difficulty in degrading and the like in the existing ultraviolet shielding material are solved; the synthetic aramid nanometer fibers are used for obviously improving the thermodynamics property and excellent ultraviolet shielding property of the composite material; the preparation process issimple, the cost is low, the property is excellent, the green and degradable effects are realized, and the application prospect is broad.

Description

Technical field [0001] The invention belongs to the technical field of composite materials, and specifically relates to a preparation method of a water-dispersed aramid nanofiber / nanocellulose composite system and an ultraviolet shielding transparent film. Background technique [0002] With the intensification of human modern industrialization activities, the ozone layer, which can absorb 99% of ultraviolet rays in the atmosphere, has been severely destroyed. Excessive ultraviolet radiation will not only cause degradation and aging of organic polymer materials on the earth, but more serious is that humans themselves will also suffer from skin cancer. [0003] In order to minimize the harm caused by ultraviolet radiation, ultraviolet shielding materials have become a research focus in recent years. According to the shielding principle, ultraviolet shielding materials can be divided into ultraviolet reflectors and ultraviolet absorbers. At present, UV reflectors are widely used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/05C08J5/18C08L1/02C08L77/10
CPCC08J3/05C08J5/18C08J2301/02C08J2477/10
Inventor 张美云罗晶晶杨斌刘国栋陆赵情宋顺喜
Owner SHAANXI UNIV OF SCI & TECH