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A kind of hb(a-m) modified boron nitride nanotube reinforced PVA fiber and preparation method thereof

A boron nitride nanotube, modified technology, applied in the chemical characteristics of fibers, rayon manufacturing, textiles and papermaking, etc., can solve the problems of less surface defects, poor dispersion performance, poor stability, poor solubility, etc. The effect of increasing interaction, broad application prospects and excellent performance

Active Publication Date: 2022-02-08
DONGHUA UNIV
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AI Technical Summary

Problems solved by technology

At present, BNNT is often used to enhance PVA film in the existing technology. Because BNNT has a large aspect ratio and specific surface area, there is a large area of ​​contact between BNNTs, which makes there are strong van der Waals forces between BNNTs, resulting in BNNTs being entangled with each other. , often presents a state of agglomeration, forming a stress concentration point, which affects the strengthening effect on the PVA film. In addition, BNNT has few surface defects, good chemical stability, and lack of active functional groups, which makes it difficult to disperse in most solvents. Facilitate the realization of the reinforcement of the material
[0006] At present, there is no report on the use of BNNT to strengthen PVA fibers, and the use of BNNT to strengthen PVA fibers must also have the problem of poor dispersion performance
To solve this problem, the existing technology adopts tip ultrasonic assisted hydrolysis, BNNT is functionalized by hydroxyl, and the energy generated by the tip ultrasonic treatment causes the original BNNT clusters to be untied, part of the B-N bond is broken, and the nanotubes are untied, but this technology disperses the BNNT Not only the stability and solubility are poor, but also the mechanical properties of BNNT will be destroyed; there are also existing technologies to improve the dispersion of BNNT through covalent modification and non-covalent modification, and most of the covalent modification adopts grafting on the surface of BNNT Polystyrene, polymethyl methacrylate, and alkane chains, but because this is a chemical modification that can change the properties of BNNT, so most of them currently use non-covalent modification (such as hydrogen bonds, π-π bonds), through Grafting amine polymers such as oleic acid amine and polyethyleneimine on the surface of BNNT improves the dispersion of BNNT, but the improvement effect is limited, and the dispersion of BNNT still needs to be further improved

Method used

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  • A kind of hb(a-m) modified boron nitride nanotube reinforced PVA fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of preparation method of HB (A-M) modified boron nitride nanotube reinforced PVA fiber, concrete steps are as follows:

[0058] (1) Prepare PVA swelling solution, HB(A-M) and hydroxylated BNNT respectively;

[0059] (1.a) prepare PVA swelling liquid;

[0060] The degree of polymerization is 32000, the degree of alcoholysis is 98%, and the average fineness is 20 mesh PVA is added to DMF and H with a mass ratio of 6:2. 2 After being in the mixed solution of O, be warming up to 40 ℃ insulation 20min by 23 ℃, continue to heat up to 50 ℃ insulation 30min again, obtain the PVA swelling liquid that the content of PVA is 36wt%;

[0061] (1.b) Preparation of HB(A-M);

[0062] First, aspartic acid, dimethylolpropionic acid, DMAc and catalyst z (concentrated sulfuric acid with a concentration of 95wt%) were added to the reactor to dissolve and react, and after stirring for 5 hours at 25°C, the AB monomer was obtained, and then the catalyst was added m (the concentrated s...

Embodiment 2

[0080] A kind of preparation method of HB (A-M) modified boron nitride nanotube reinforced PVA fiber, concrete steps are as follows:

[0081] (1) Prepare PVA swelling solution, HB(A-M) and hydroxylated BNNT respectively;

[0082] (1.a) prepare PVA swelling liquid;

[0083] The degree of polymerization is 33000, the degree of alcoholysis is 98.2%, and the average fineness is 30 mesh PVA is added to the mass ratio of 7:2 of DMF and H 2 After being in the mixed solution of O, be warming up to 43 ℃ insulation 18min by 24 ℃, continue to heat up to 52 ℃ insulation 28min again, obtain the PVA swelling liquid that the content of PVA is 38wt%;

[0084] (1.b) Preparation of HB(A-M);

[0085] First add aspartic acid, dimethylolpropionic acid, DMAc and catalyst z (concentrated sulfuric acid with a concentration of 96wt%) into the reactor to dissolve and react, stir at 27°C for 4 hours to obtain AB monomer, and then add the catalyst m (concentration 96wt% concentrated sulfuric acid), th...

Embodiment 3

[0097] A kind of preparation method of HB (A-M) modified boron nitride nanotube reinforced PVA fiber, concrete steps are as follows:

[0098] (1) Prepare PVA swelling solution, HB(A-M) and hydroxylated BNNT respectively;

[0099] (1.a) prepare PVA swelling liquid;

[0100] The degree of polymerization is 34000, the degree of alcoholysis is 98.6%, and the average fineness is 40 mesh PVA, which is added to DMF and H with a mass ratio of 8:2. 2 After being in the mixed solution of O, be warming up to 46 ℃ insulation 16min by 25 ℃, continue to heat up to 54 ℃ insulation 26min again, obtain the PVA swelling liquid that the content of PVA is 39wt%;

[0101] (1.b) Preparation of HB(A-M);

[0102] First, aspartic acid, dimethylolpropionic acid, DMAc and catalyst z (concentrated sulfuric acid with a concentration of 97wt%) were added to the reactor to dissolve and react, and after stirring for 3 hours at 29°C, the AB monomer was obtained, and then the catalyst was added m (concentra...

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Abstract

The invention relates to a HB(A-M) modified boron nitride nanotube reinforced PVA fiber and a preparation method thereof. The preparation method is as follows: PVA spinning solution containing HB(A-M) modified boron nitride nanotubes HB(A-M) modified boron nitride nanotubes reinforced PVA fibers were prepared by dry and wet spinning; HB(A-M) modified boron nitride nanotubes were obtained by dissolving HB(A-M) in In ionized water, add hydroxylated BNNT to it and carry out ultrasonic treatment to obtain; HB (A-M) is a hyperbranched polymer synthesized with AB as a monomer and dihydroxyethylamine as a core molecule, wherein AB is composed of mol The ratio is 1.0~1.2:1.7~2.4 aspartic acid reacts with dimethylolpropionic acid; the content of PVA in PVA spinning solution is 35~40wt%, and the viscosity of PVA spinning solution is 1500~2200Pa· s; the obtained HB(A-M) modified boron nitride nanotube reinforced PVA fiber has a fineness of 24.1-35.3 dtex, a breaking strength of 15.9-19.6 cN / dtex, and an elastic modulus of 376-389 cN / dtex. The invention effectively solves the problem of poor dispersibility of BNNT, and prepares the HB(A-M) modified boron nitride nanotube reinforced PVA fiber with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of PVA (polyvinyl alcohol) fibers, and relates to an HB (A-M) modified boron nitride nanotube reinforced PVA fiber and a preparation method thereof. Background technique [0002] Concrete has the advantages of abundant raw materials, low cost, strong plasticity, and good durability, so it is widely used to strengthen geotechnical buildings. However, the cement concrete structure has the characteristics of heterogeneity and multiphase porosity, and it is easy to form large-scale micro-cracks and micro-holes in the interface area between the aggregate and the cementitious material, so the cement concrete will produce when it is subjected to external loads. Local stress concentration leads to the disadvantages of high brittleness, poor ductility and crack resistance in cement concrete. The mechanism of fiber reinforced concrete mainly includes three kinds, namely crack resistance theory, composite material theo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/50D01F1/10
CPCD01F6/50D01F1/10
Inventor 邹黎明王艳丽李文刚何钧炜何子锐王华君陈德强李艳
Owner DONGHUA UNIV
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