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Polyformaldehyde fiber, modification method and application of polyformaldehyde fiber

A polyoxymethylene fiber modification technology, applied in fiber type, fiber treatment, ultrasonic/acoustic fiber treatment, etc., can solve the problems of weak interface bonding strength, complex process, limited fiber reinforcement effect, etc. The method is simple and improved Effects of interface strength, increased chemical reactivity, and roughness

Active Publication Date: 2020-03-06
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some articles have proved that POM fiber has certain compatibility with cement concrete, which can improve the tensile strength of cement concrete (Hou Shuai, Wang Wennian, Zeng Xiansen, etc. Research on splitting tensile strength of polyoxymethylene fiber reinforced concrete. Journal of Wuhan Textile University , 2013, 26(3): 39-42), but there is no effective physical and chemical interaction between organic POM fiber and inorganic cement concrete interface, resulting in weak interfacial bonding strength, and the reinforcement effect of fiber on cement concrete is limited
There are also special processes for preparing thread structures (Li Jun, Huang Yudong, Hu Jian, etc. CN201310023040. A controllable etching method for fiber surface, 2013), but complex twisting technology is used, and the process is complicated

Method used

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  • Polyformaldehyde fiber, modification method and application of polyformaldehyde fiber
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  • Polyformaldehyde fiber, modification method and application of polyformaldehyde fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) 0.2g nano-SiO 2 The powder is dispersed in 19.8g of aqueous medium, and 0.004g of γ-methacryloxypropyltrimethoxysilane coupling agent is added to nano-SiO at 70°C 2 The dispersion liquid was stirred for 2 hours to obtain a modified nano-silica powder dispersion liquid with a mass concentration of 1 wt%.

[0040] (2) The POM fiber is treated with a long and narrow linear dielectric barrier discharge plasma treatment device parallel to the fiber to be treated, that is, as Figure 4 As shown, the POM fibers are placed parallel to the electrodes, and the two ends of the fibers are respectively hung on the support frames of the two electrodes for processing. The processing atmosphere is air, the processing voltage is 220v, the processing power is 400w, and the processing time is 60s. The modified POM fiber with certain texture and active groups on the surface is obtained.

[0041] The scanning electron microscope pictures of POM fibers before and after modification are...

Embodiment 2

[0045] (1) 0.4g nano-SiO 2 The powder is dispersed in 19.6g of aqueous medium, and 0.004g of γ-methacryloxypropyltrimethoxysilane coupling agent is added to nano-SiO at 70°C 2 The dispersion liquid was stirred for 2 hours to obtain a modified nano-silica powder dispersion liquid with a mass concentration of 2 wt%.

[0046] (2) Adopt linear dielectric barrier discharge plasma processing device to process POM fiber, that is, place POM fiber parallel to the electrodes, and hang the two ends of the fiber on the support frames of the two electrodes respectively for processing. The processing atmosphere is air, and the processing The voltage was 220v, the processing power was 400w, and the processing time was 60s to obtain plasma-modified POM fibers. The modified POM fiber with certain texture and active groups on the surface was obtained, and the tensile performance test was carried out. The breaking strength of the original fiber was reduced from 26.50N to 10.23N.

[0047] (3) P...

Embodiment 3

[0050] (1) 0.6g nano-SiO 2 The powder is dispersed in 19.4g of aqueous medium, and 0.004g of γ-methacryloxypropyltrimethoxysilane coupling agent is added to nano-SiO at 70°C 2 The dispersion liquid was stirred for 2 hours to obtain a modified nano-silica powder dispersion liquid with a mass concentration of 3 wt%.

[0051] (2) Adopt linear dielectric barrier discharge plasma processing device to process POM fiber, that is, place POM fiber parallel to the electrodes, and hang the two ends of the fiber on the support frames of the two electrodes respectively for processing. The processing atmosphere is air, and the processing The voltage was 220v, the processing power was 400w, and the processing time was 60s to obtain plasma-modified POM fibers. The modified POM fiber with certain texture and active groups on the surface was obtained, and the tensile performance test was carried out. The breaking strength of the original fiber was reduced from 26.50N to 10.23N.

[0052] (3) P...

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Abstract

The invention belongs to the technical field of building materials, and discloses a polyformaldehyde fiber, a modification method and an application of the polyformaldehyde fiber. The modification method of the polyformaldehyde fiber includes the steps: treating a POM (polyformaldehyde) fiber by the aid of a linear dielectric barrier discharge plasma treatment device to generate an active group and a special threaded fine rough structure on the surface of the POM fiber to greatly improve chemical reactivity and roughness of the surface of the POM fiber; grafting nano-inorganic powder on the surface of the POM fiber after activating reaction by the aid of coupling agents, and covering the surface of the fiber with the compact nano-inorganic powder to make up damage to mechanical propertiesof the POM fiber caused by plasma treatment and improve interfacial strength between the POM fiber and cement concrete. The polyformaldehyde fiber can be applied to improvement of the strength of cement concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polyoxymethylene fiber, a modification method and an application thereof. Background technique [0002] High strength and long life are the main development direction of cement-based composite materials at present. Many infrastructure deterioration problems can be traced to the brittleness and cracking of cement concrete, thus, improving the ductility of cement-based materials is an important research effort. So far, adding fibers to cement-based materials is one of the most effective means to impart ductility, which can strengthen and toughen the cement matrix, improve its flexural and tensile strength, control the propagation and development of cracks, and improve the failure mode , improve durability. Therefore, Fiber Reinforced Cementitious Composites (FRCC for short) was born. The incorporation of fibers can greatly improve the performance of the cement concr...

Claims

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Application Information

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IPC IPC(8): D06M11/79D06M13/513D06M10/02D06M10/06C04B16/06D06M101/30
CPCD06M11/79D06M13/5135D06M10/025D06M10/06C04B16/0675D06M2101/30
Inventor 魏发云张伟王海楼徐笑梁芳华
Owner NANTONG UNIVERSITY
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