A kind of nano-cellulose composite PVA material and its preparation method and application

A nanocellulose and fiber technology, applied in the direction of cellulose/protein conjugated rayon, fiber chemical characteristics, rayon manufacturing, etc., can solve the multifunctional requirements of materials, tensile strength, tensile modulus, etc. General properties such as elongation at break, lack of excellent performance, etc.

Active Publication Date: 2020-02-04
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are a lot about polyvinyl alcohol and its corresponding modified products, and there are also about nanocellulose and its related modified products, but generally polyvinyl alcohol and its related fiber products have tensile strength, tensile modulus, etc. The properties such as weight and elongation at break are average. In order to meet the needs of the contemporary market, they need to be further improved, and they do not have other excellent properties. The same nanocellulose and its related modified products only maintain the basic properties of nanocellulose itself. The structure and performance cannot meet modern people's requirements for the versatility of the material itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0078] Preparation of nanocellulose:

[0079] 1) Using cellulose such as corncob cellulose, poplar cellulose, and reed cellulose as raw materials, a stable cellulose colloidal nano-cellulose crystal is prepared by sulfuric acid hydrolysis, and the obtained nano-cellulose crystal aqueous solution is washed , washed until the pH is neutral;

[0080] 2) The nanocellulose aqueous solution is ultrasonically dispersed using a cell ultrasonic pulverizer to obtain a stable suspension, wherein the aspect ratio of the nanocellulose is (2-50): 1, and the diameter of the nanocellulose is 70nm the following;

[0081] 3) Then undergo classification treatment to obtain nanocellulose with an aspect ratio of (2-300):1 and a diameter below 50nm.

preparation example 2

[0083] Preparation of graphene-like substances:

[0084] One or several mixtures of graphene, biomass graphene, graphene oxide, and graphene derivatives are selected as raw materials to prepare a solution, and the cell ultrasonic pulverizer is used for ultrasonic dispersion treatment to obtain D90 below 60um and D10 An aqueous solution of graphene substances below 10um.

Embodiment 1

[0086] The preparation method of composite PVA material is as follows:

[0087] 1) Select nanocellulose for ultrasonic dispersion treatment, the ultrasonic dispersion power is 800w, and the ultrasonic dispersion time is 20min to obtain a stable suspension (the aspect ratio of nanocellulose in the suspension is (2-20): 1 , with a diameter of 10-20nm);

[0088] 2) directly mix the above-mentioned suspension with the PVA solution containing boric acid (the degree of polymerization of PVA is 1700, and the degree of alcoholysis is 99%), stir at 90° C. for 1 hour, and prepare a mixed solution with a concentration of PVA of 15 wt % and a concentration of boric acid of 3 wt %;

[0089] 3) heating and drying the mixed solution at 150° C., and granulating to obtain a masterbatch with a nanocellulose content of 10 wt %;

[0090] 4) Add the masterbatch to the PVA solution containing boric acid and mix (the degree of polymerization of PVA is 2500, and the degree of alcoholysis is 88%), st...

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Abstract

The invention provides a nanocellulose composite PVA (polyvinyl alcohol) material. The nanocellulose composite PVA material is mainly prepared from nanocellulose and PVA, wherein in the nanocellulose composite PVA material, the length and diameter ratio of the nanocellulose is controlled to be (2-300):1. A preparation method comprises the following steps of (A) dispersing a nanocellulose solution, so as to obtain a dispersing water solution; (B) mixing and stirring a PVA water solution, boric acid and the dispersing water solution, so as to obtain a mixed solution. The nanocellulose composite PVA material has the advantages that by reasonably mixing the nanocellulose and the PVA, and controlling the nanocellulose to be within the proper length and diameter ratio range, the uniformity of the nanocellulose in the PVA material is improved; when the nanocellulose composite PVA material is prepared into fiber and other products, the functionality of the PVA material is increased, the self strength, modulus, toughness and proper indexes of the PVA material are improved, and the mechanical property of the fiber self is further improved.

Description

technical field [0001] The invention relates to the field of processing and preparation of polyvinyl alcohol (PVA) materials, in particular to a nanocellulose composite PVA material, a preparation method and an application thereof. Background technique [0002] Cellulose is a ubiquitous and renewable resource on earth. Nanocellulose is a kind of cellulose crystal obtained after the natural cellulose is treated (such as mechanical grinding, acid hydrolysis, biological enzyme hydrolysis, etc.), the amorphous region and the low crystallinity crystal region in the cellulose are broken. . Nanocellulose prepared from natural cellulose not only has the basic structure and properties of cellulose, but also has a huge specific surface area, high crystallinity (>70%), high hydrophilicity, high Young's modulus, high strength (7500MPa ), ultra-fine structure and high transparency, good biodegradability and biocompatibility, and stable chemical properties. In addition, because a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/10D01F8/02D01F6/50D01F1/10
CPCD01F1/10D01F6/50D01F8/02D01F8/10
Inventor 张金柱张安王文平刘顶
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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