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A method for surface treatment and modification of high-strength and high-modulus polyvinyl alcohol fibers

A polyvinyl alcohol fiber, high-strength and high-modulus technology, applied in the field of fiber treatment, surface treatment and modification of high-strength and high-modulus polyvinyl alcohol fiber, can solve the problems of poor dispersion, expensive, limited application, etc., to reduce dosage, improve toughness, reduce The effect of manufacturing costs

Active Publication Date: 2018-01-30
杭州固益强新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The fiber used for ECC composites was the earliest ultra-high molecular weight polyethylene fiber. PE-ECC has excellent performance, but ultra-high molecular weight PE fiber is expensive. Therefore, since 1997, V.Li et al. of the University of Michigan began to use it. High-strength and high-modulus polyvinyl alcohol fiber (PVA) replaces ultra-high molecular weight PE fiber to make PVA-ECC with the same excellent performance, and its cost is only one-eighth of PE-ECC
At present, the high-strength and high-modulus PVA fibers widely used in PVA-ECC at home and abroad are mainly produced by Japan Kuraray Company (Kuralon Fiber), and the cost of the prepared PVA-ECC is still very expensive compared with general concrete, making PVA-ECC The material is used in conjunction with ordinary concrete in most engineering applications or as a reinforcement or repair material for ordinary concrete, which greatly limits the application of this type of material in construction engineering
[0005] There are several vinylon factories in my country that can produce high-strength and high-modulus PVA fibers. Compared with foreign products, the strength and modulus of fibers are very close, and the price of fibers is much lower than that of imported products. However, due to the interface structure between domestic PVA fibers and cement matrix It has not been optimized. At the same time, the dispersion of domestic high-strength and high-modulus PVA fibers in cement is poor, and it is difficult to achieve the matrix toughening and concrete cracking effects of imported high-strength and high-modulus PVA fibers, which limits the use of domestic fibers in high-performance cement-based composites. application of materials
[0006] Fiber surface treatment is an important method to adjust the interface structure of composite materials. It has certain applications in aramid, ultra-high molecular weight polyethylene, glass fiber, and carbon fiber composite materials. However, the fibers used in cement-based composite materials in the existing technology Surface modification methods are rarely reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Polyvinyl alcohol fiber: strength 900MPa, modulus 30GPa, fineness 100μm.

[0027] Fiber cleaning: AEO (fatty alcohol polyoxyethylene ether)-9 2g / l, Na 2 CO 3 2g / l, temperature 90℃, time 30min, wash 3 times with water, drying temperature 90℃, time 30min.

[0028] 19.4g of amino polysiloxane emulsion (Blue Star C803) with a solid content of 35%, 6.6g of sol-gel method with a solid content of 30% prepared nano-silica (particle size 10nm), 2g of 3-(2,3- Glycidoxypropyl) trimethoxysilane, 5g of palm wax emulsion with a solid content of 20% are firstly diluted 4-5 times with deionized water, and then diluted with deionized water to 1L. When mixing the aforementioned emulsions, pay attention to their ion compatibility Properties, wherein the total amount of effective substances in the aforementioned emulsion is 10g. Among the total effective substances, amino polysiloxane accounts for 68%, silicon dioxide accounts for 20%, silane coupling agent accounts for 2%, and lubrican...

Embodiment 2

[0034] Polyvinyl alcohol fiber: strength 1000MPa, modulus 35GPa, fineness 60μm

[0035] Fiber cleaning: AEO-9 2g / l, Na 2 CO 3 2g / l, temperature 90℃, time 30min, wash 3 times with water, drying temperature 90℃, time 30min.

[0036] 58.5g polyether modified aminopolysiloxane CTA (Wacker Chemical), 30.8g solid content 65% particle size 20nm nano-silica dispersion, 1.5g 3-(2,3-glycidoxypropyl) triethoxysilane, 50g solid content 40% The paraffin wax emulsion was firstly diluted 4-5 times with deionized water, and then replenished, and then diluted to 1L with deionized water. Pay attention to its ion compatibility when mixing the aforementioned emulsions, wherein the total amount of effective substances in the aforementioned emulsions is 100g. Among the total effective substances, polyether-modified aminopolysiloxane accounts for 58.5%, silicon dioxide accounts for 20%, silane coupling agent accounts for 1.5%, and lubricant accounts for 20%.

[0037] At a temperature of 40°C, t...

Embodiment 3

[0041] Polyvinyl alcohol fiber: strength 1200MPa, modulus 40GPa, fineness 40μm

[0042] Fiber cleaning: AEO-9 2g / l, Na 2 CO 3 2g / l, temperature 90℃, time 30min, wash 3 times with water, drying temperature 90℃, time 30min.

[0043] 30.4g solid content 65% Dow Corning MEM-0349 Polydimethylsiloxane Emulsion, 29.7g Polyether Modified Aminopolysiloxane CTA (Wacker Chemical), 0.56g solid content 45% particle size 15nm nano-silica dispersion, 0.25g 2-(3,4-epoxycyclohexane) ethyl trimethoxysilane were firstly deionized water Dilute 4-5 times, and then add deionized water to dilute to 1L. When mixing the aforementioned emulsion, pay attention to its ion compatibility, wherein the total amount of active substances in the aforementioned emulsion is 50g. In the total amount of effective substances, polysiloxane accounts for 99%, silicon dioxide accounts for 0.5%, silane coupling agent accounts for 0.5%, and lubricant accounts for 0%.

[0044] At a temperature of 30°C, the cleaned f...

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Abstract

The invention discloses a surface treatment and modification method for high-strength high-mold polyvinyl alcohol fibers. The surface treatment and modification method comprises the following steps: washing the surfaces of the high-strength high-mold polyvinyl alcohol fibers, drying the washed high-strength high-mold polyvinyl alcohol fibers, soaking the dried high-strength high-mold polyvinyl alcohol fibers into an emulsion, carrying out padding and baking, and then carrying out washing and drying, wherein the emulsion comprises polysiloxane, nano silica, a silane coupling agent and a lubricant. According to the method, the interface between the polyvinyl alcohol fibers and a cement matrix can be regulated and controlled, so that the surface-modified high-strength high-mold polyvinyl alcohol fibers can be well applied to a high-tenacity cement-based composite material, the quantity of the high-strength high-mold polyvinyl alcohol fibers in cement is reduced, the tenacity of the cement-based composite material is improved, and the production cost of the high-tenacity cement-based composite material is reduced.

Description

technical field [0001] The invention relates to a fiber treatment method, relates to a surface treatment modification method of high-strength and high-modulus polyvinyl alcohol fibers, and belongs to the field of fiber material modification and industrial fiber material preparation. Background technique [0002] High-strength and high-modulus polyvinyl alcohol (PVA) fibers have the characteristics of high strength, high modulus, and excellent alkali resistance. Since the 1990s, their short fibers have been widely used in high-performance cement-based composite materials to improve the strength of concrete. Toughness and crack cracking characteristics, and at the same time can improve the durability indicators of concrete such as impermeability, carbonation resistance, and thawing resistance, and improve the safety and durability of concrete structures. [0003] Among them, ECC (Engineered Cementitious Composites) or ultra-high toughness cementitious composites (UHTCC) is a k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/643D06M15/647D06M15/65D06M11/79D06M13/513D06M15/01D06M101/24
CPCD06M11/79D06M13/513D06M15/01D06M15/643D06M15/6436D06M15/647D06M15/65D06M2101/24Y02A30/30
Inventor 张华鹏闻克瑜范立峰王激扬
Owner 杭州固益强新材料科技有限公司