OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and preparation method thereof

A technology of OH-HBP, polyvinyl alcohol fiber, applied in the direction of fiber chemical characteristics, rayon manufacturing, single-component synthetic polymer rayon, etc., can solve the problem of excessive viscosity of polyvinyl alcohol spinning solution, difficulty in spinning, Problems such as poor spinnability, to achieve the effect of increasing interaction, reducing tangles, and improving strength

Active Publication Date: 2021-09-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art that the viscosity of polyvinyl alcohol spinning solution is too high, which leads to difficulty in spinning, poor spinnability, etc., and to provide a high-strength coarse denier polyvinyl alcohol containing terminal hydroxyl hyperbranched polymer (OH-HBP). Polyvinyl alcohol fiber and its preparation method

Method used

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  • OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and preparation method thereof
  • OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and preparation method thereof
  • OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] A preparation method of high-strength coarse denier polyvinyl alcohol fibers containing OH-HBP, the specific steps are as follows:

[0063] (1) prepare polyvinyl alcohol swelling liquid and OH-HBP respectively;

[0064] (1.a) preparing polyvinyl alcohol swelling liquid;

[0065] Polyvinyl alcohol with a degree of polymerization of 3100, a degree of alcoholysis of 98%, and an average fineness of 20 meshes is added to DMF and H at a mass ratio of 6:2. 2 After being in the mixed solution of O, heat up from 25°C to 40°C for 20min, and then continue to heat up to 50°C for 30min, to obtain a polyvinyl alcohol swelling solution with a polyvinyl alcohol content of 36wt%.

[0066] (1.b) preparing OH-HBP;

[0067] First, glutamic acid, glycerin, DMAc and catalyst z (the concentrated sulfuric acid of concentration 95wt%) are added in the reaction kettle to dissolve and react, obtain AB monomer after stirring 5h at 25 ℃, then add catalyst m (concentration 95wt% Concentrated sulf...

Embodiment 2

[0077] A preparation method of high-strength coarse denier polyvinyl alcohol fibers containing OH-HBP, the specific steps are as follows:

[0078] (1) prepare polyvinyl alcohol swelling liquid and OH-HBP respectively;

[0079] (1.a) preparing polyvinyl alcohol swelling liquid;

[0080] Polyvinyl alcohol with a degree of polymerization of 32000, a degree of alcoholysis of 98.2%, and an average fineness of 40 meshes is DMF and H at a mass ratio of 7:2.5 2 After being in the mixed solution of O, heat up from 26°C to 42°C for 18min, and then continue to heat up to 52°C for 28min, to obtain a polyvinyl alcohol swelling solution with a polyvinyl alcohol content of 38wt%.

[0081] (1.b) preparing OH-HBP;

[0082] First, glutamic acid, glycerol, DMAc and catalyst z (concentration of 96wt% concentrated sulfuric acid) were added to the reactor to dissolve and react, and after stirring for 4.5h at 30°C, AB monomer was obtained, and then catalyst m (concentration of 96wt%) was added co...

Embodiment 3

[0092] A preparation method of high-strength coarse denier polyvinyl alcohol fibers containing OH-HBP, the specific steps are as follows:

[0093] (1) prepare polyvinyl alcohol swelling liquid and OH-HBP respectively;

[0094] (1.a) preparing polyvinyl alcohol swelling liquid;

[0095] Polyvinyl alcohol with a degree of polymerization of 33000, a degree of alcoholysis of 98.4%, and an average fineness of 60 meshes was added to DMF and H with a mass ratio of 8:3. 2 After being in the mixed solution of O, heat up from 27°C to 44°C for 16 minutes, and then continue to heat up to 54°C for 26 minutes to obtain a polyvinyl alcohol swelling solution with a polyvinyl alcohol content of 39 wt%.

[0096] (1.b) preparing OH-HBP;

[0097] First, glutamic acid, glycerin, DMAc and catalyst z (the concentrated sulfuric acid of concentration 98wt%) are added in the reaction kettle to dissolve and react, obtain AB monomer after stirring 4h at 35 ℃, then add catalyst m (concentration 98wt% Con...

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Abstract

The invention relates to OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber and a preparation method thereof. The preparation method comprises the following steps of carrying out dry-wet spinning on an OH-HBP-containing polyvinyl alcohol spinning solution to prepare the OH-HBP-containing high-strength coarse-denier polyvinyl alcohol fiber. OH-HBP is HB(G-G) or HB(I-G); the HB(G-G) is a hyperbranched polymer synthesized by taking AB as a monomer and malic acid as a nuclear molecule, wherein the AB is formed by reacting glutamic acid and glycerin in a molar ratio of (1.0-1.2): 2; the HB(I-G) is a hyperbranched polymer synthesized by taking CD as a monomer and glycerol as a core molecule, wherein the CD is formed by reacting itaconic acid and hydroxylamine in a molar ratio of (1.0-1.2): 1; the content of polyvinyl alcohol in the polyvinyl alcohol spinning solution is 35-40 wt%, and the viscosity of the polyvinyl alcohol spinning solution is 1500-2200 Pa.s; and the fineness of the prepared high-strength coarse-denier polyvinyl alcohol fiber is 22.2 to 26.5 dtex, and the breaking strength of the prepared high-strength coarse-denier polyvinyl alcohol fiber is 14.5 to 15.6 cN/dtex. The method is simple; the problems that in the prior art, due to the fact that the viscosity of the polyvinyl alcohol spinning solution is too large, silk discharging is difficult and the spinnability is poor are effectively solved; and the prepared fiber can effectively overcome the defects that concrete is poor in crack resistance, large in brittleness and the like.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol (PVA) fibers, and relates to a high-strength coarse denier polyvinyl alcohol fiber containing OH-HBP 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. Due to their high tensile strength and modulus, the ductility and fracture toughness of PVA fiber-reinforced concrete are greatly improved, making these fibers particularly suitable for civil engineering applications. According to the fiber bridging theory, under the action of tensile load, the fiber is the carrier of stress transmission in the matrix, and transmits the stress at the crack to the surrounding matrix. Therefore, the interfacial bonding between fiber and matrix is ​​the key to the high ductility of cement-based composites. [0003] However, traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10C08G83/00
CPCD01F6/50D01F1/10C08G83/005
Inventor 邹黎明王艳丽李文刚何钧炜吴晓瑾杜依帆盛俊杰李艳
Owner DONGHUA UNIV
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