PVA-CSH composite fiber and preparation method thereof

A PVA-CSH, 1. PVA-CSH technology, applied in the field of composite fiber materials, can solve the problems of complex post-processing process, unmarketable melted PVA fiber, increasing fiber specific surface area, interface bonding strength, etc.

Inactive Publication Date: 2021-06-08
刘翠芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN105506999A uses an emulsion containing polysiloxane, nano-silica, silane coupling agent and lubricant to pad high-strength and high-modulus PVA fibers to improve the interface between PVA fibers and cement matrix. The post-treatment process is relatively complicated
Patent CN111205026A prepares special-shaped PVA fibers with triangular, trilobal, four-lobed or flat wavy cross-sections by melt spinning, which increases the specific surface area of ​​the fibers and the interface bonding strength with cement, but the melt method PVA Fiber is not marketed

Method used

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  • PVA-CSH composite fiber and preparation method thereof
  • PVA-CSH composite fiber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of PVA-CSH composite fiber, comprises the steps:

[0027] S1. Preparation of PVA-CSH composite spinning stock solution: Add the PVA raw material into hot water and stir to dissolve it. After it is uniform and stable, add nano-calcium silicate hydrate dispersion, continue to stir to make the solution fully mixed, and let it stand to remove it from the mixed solution. bubbles to obtain a composite spinning stock solution; the mass ratio of PVA to nano calcium silicate hydrate in the composite spinning stock solution is 4 to 20:1;

[0028] S2. Preparation of primary fibers: adding the above-mentioned composite spinning stock solution into the barrel, using a metering pump to squeeze the composite spinning stock solution through the spinneret into the coagulation bath, and winding to obtain PVA-CSH composite primary fibers;

[0029] S3. Post-processing: the PVA-CSH composite primary fiber is subjected to multi-stage thermal stretching and heat setting...

Embodiment 2

[0034] The preparation method of PVA-CSH composite fiber, concrete preparation steps are as follows:

[0035] S1. Add 128.0 parts of PVA raw material with a degree of polymerization of 1700 and a degree of alcoholysis of 99.7% into 352.0 parts of water, stir, the temperature rises to 98° C., and dissolve for 6 hours. Add 400.0 parts of nano-calcium silicate hydrate dispersion liquid with an effective content of 8%, continue to stir for 1 hour, and let stand at normal pressure for 2 hours for defoaming. The mass fraction of PVA in the spinning dope is 14.5%, and the mass ratio of PVA to nano calcium silicate hydrate is 4.0:1.

[0036] S2. Add the above-mentioned composite spinning stock solution into the barrel, and use a metering pump to squeeze the composite spinning stock solution into a saturated sodium sulfate coagulation bath to prepare PVA-CSH composite primary fibers. The barrel and spinneret temperatures were both 95°C, the coagulation bath temperature was 35°C, and t...

Embodiment 3

[0040] S1. Add 120.0 parts of PVA raw material with a degree of polymerization of 2000 and a degree of alcoholysis of 99.6% into 602.2 parts of water, stir, the temperature rises to 96° C., and dissolve for 3 hours. Add 110.1 parts of nano-calcium silicate hydrate dispersion liquid with an effective content of 12%, continue to stir for 0.5 h, and stand at normal pressure for 1 h for defoaming. The mass fraction of PVA in the spinning dope is 14.4%, and the mass ratio of PVA to nano calcium silicate hydrate is 9.1:1.

[0041] S2. Add the above-mentioned composite spinning stock solution into the barrel, and use a metering pump to squeeze the composite spinning stock solution into a saturated sodium sulfate coagulation bath to prepare PVA-CSH composite primary fibers. The barrel and spinneret temperatures were both 96°C, the coagulation bath temperature was 40°C, and the spinneret draw ratio was 1.

[0042] S3. The above-mentioned PVA-CSH composite primary fiber is subjected to...

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Abstract

The invention relates to the field of composite fiber materials, and discloses a PVA-CSH composite fiber and a preparation method thereof. A PVA raw material is added into hot water so as to be stirred and dissolved, then nano hydrated calcium silicate dispersion liquid is added, the mixture is stirred to be uniform, bubbles are removed, and a composite spinning stock solution is obtained. Nano hydrated calcium silicate has good dispersibility in a PVA solution, so that the spinnability of a stock solution is not affected, filaments are not broken and holes are not blocked in the spinning process, and agglomerated particles do not exist on a filter screen; and the nano hydrated calcium silicate migrates to the surface of the fiber under the action of a strong shear field of spinneret holes in a wet spinning process, so that the PVA-CSH composite fiber with the surface rich in nano hydrated calcium silicate particles is prepared through multi-stage heat stretching and heat setting. When the PVA-CSH composite fiber is applied to a cement-based material, the surface of the PVA-CSH composite fiber is rough, and the nano hydrated calcium silicate on the surface of the fiber serves as a cement hydration product and can provide nucleation sites, so that nucleation barriers are reduced, a cement hydration product is induced and promoted to grow in the axial direction of the fiber, the interface interaction between the fiber and the cement-based material is improved, and meanwhile, the early-stage mechanical property can also be improved.

Description

technical field [0001] The invention relates to the field of composite fiber materials, in particular to a PVA-CSH composite fiber and a preparation method thereof. Background technique [0002] With the development of the construction industry, fiber concrete has been widely used in practical engineering. Studies have shown that fibers can improve the toughness of concrete, inhibit the early plastic cracking of concrete, effectively control the development of cracks, and improve the impermeability, waterproof and anti-seepage of concrete. Durability such as frost also has a good promotion effect. [0003] Fibers commonly used in fiber concrete include steel fiber, carbon fiber, basalt fiber, polypropylene (PP) fiber and polyvinyl alcohol (PVA) fiber, etc. Among them, PP fiber has good chemical stability and moderate price. It can passivate the original cracks when added to concrete The stress concentration at the tip makes the stress field in the medium more continuous and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10
CPCD01F1/10D01F6/50
Inventor 贾二鹏王志娟黄玉美王玉乾王进春刘翠芬
Owner 刘翠芬
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