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Preparation method of water-dispersible aramid nanometer fiber/nanometer cellulose composite system and ultraviolet shielding type transparent thin 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: 2018-07-13
SHAANXI UNIV OF SCI & TECH
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  • 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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  • Preparation method of water-dispersible aramid nanometer fiber/nanometer cellulose composite system and ultraviolet shielding type transparent thin film
  • Preparation method of water-dispersible aramid nanometer fiber/nanometer cellulose composite system and ultraviolet shielding type transparent thin film
  • Preparation method of water-dispersible aramid nanometer fiber/nanometer cellulose composite system and ultraviolet shielding type transparent thin film

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preparation example Construction

[0037] A method for preparing a water-dispersed aramid fiber nanofiber / nanocellulose composite system, comprising the following steps:

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

[0039] Among them, the ratio of para-aramid fiber X, KOH and DMSO is 1g: 1.5g: 500mL; the stirring refers to stirring at a temperature of 30-60°C for 5-8 days under sealed conditions; the para-aramid 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 nanofiber dispersed in the KOH / DMSO system obtained in step (1) to obtain a uniformly dispersed aramid nanofiber dispersion B;

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

[0042] (3) adding nanocellulose Y to de...

Embodiment 1

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

[0066] (2) Dilute the aramid nanofiber 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) adding deionized water to the nanocellulose obtained by chemical acid hydrolysis and stirring 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) With the nanocellulose suspension C obtained in step (3), under the effect of 600rpm, the aramid nanofiber dispersion obtained in the high-pressure injection step (2), the aramid nanofiber and The mass ratio of nanocellulose is 1:100, the jet pressure is 5MPa, and the je...

Embodiment 2

[0078] (1) Put 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 mixture dispersed in KOH / Aramid nanofiber dispersion A under DMSO system;

[0079] (2) Dilute the aramid nanofiber 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) adding deionized water to the nanocellulose obtained by chemical pretreatment in conjunction with mechanical treatment and stirring 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) With the nanocellulose suspension C obtained in step (3), under the effect of 1000rpm, the aramid nanofiber dispersion obtained in the high-pressure injection step (2), the aramid nanofiber and The mass ratio of nanocellulose is 3:1...

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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 in particular relates to a water-dispersed aramid nanofiber / nanocellulose composite system and a method for preparing 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 damaged. Excessive ultraviolet radiation will not only lead to the degradation and aging of organic polymer materials on the earth, but more seriously, human beings 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 hotspot in recent years. According to the shielding principle, UV shielding materials can be divided into UV reflectors and UV absorbers. At present, the most widely used ultraviolet reflectors ar...

Claims

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Application Information

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Patent Type & Authority Applications(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
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