A kind of preparation method of chopped fiber oriented mat

A chopped fiber and fiber orientation technology, which is applied in fiber raw material processing, synthetic cellulose/non-cellulose material pulp/paper, papermaking, etc., can solve problems such as complex orientation devices, low degree of orientation of chopped fibers, and environmental pollution , to achieve the effects of improved mechanical properties, high degree of orientation, and simple preparation process

Active Publication Date: 2017-04-12
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of preparation method of chopped fiber oriented mat, take water as the main dispersion medium and methyl cellulose as the auxiliary dispersion medium, solve the problem that the organic solvent dispersion medium existing in the prior art pollutes the environment, At the same time, through the specific preparation process and device, the problems of low degree of orientation of chopped fibers in the chopped fiber orientation mat obtained in the prior art, complicated orientation device and low production efficiency are further solved.

Method used

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  • A kind of preparation method of chopped fiber oriented mat
  • A kind of preparation method of chopped fiber oriented mat
  • A kind of preparation method of chopped fiber oriented mat

Examples

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Effect test

Embodiment 1

[0026] 1) Fiber dispersion: Put chopped fibers, methyl cellulose and water into a stirring tank and stir evenly at a stirring speed of 600r / min for 30 minutes, and the chopped fibers are uniformly distributed in the form of monofilaments. Wherein the fiber is chopped carbon fiber, the length is 4mm, the content (percentage by weight) is 0.1%, the amount of methyl cellulose added is 13g / L, the actual measured viscosity of the suspension is 8.539Pa.s, and the gas content of the suspension is 4%. .

[0027] 2) Fiber orientation: Press the uniformly dispersed chopped fiber suspension in 1) into the tapered orientation nozzle through the air compressor, the length of the orientation nozzle is 10cm, the included angle of the flow channel is 30°, and the nozzle width of the orientation nozzle is 1.0mm , use the tapered orientation nozzle to orient the short fibers, and continuously feed them into the continuously running conveyor belt to obtain a uniformly distributed fiber-oriented ...

Embodiment 2

[0033] 1) Fiber dispersion: Put chopped fibers, methyl cellulose and water into a stirring tank and stir evenly at a stirring speed of 1000r / min for 20 minutes, and the fibers are uniformly distributed in the form of monofilaments. Wherein the fiber is chopped glass fiber, the length is 3mm, the content (percentage by weight) is 0.8%, the methylcellulose addition is 8g / L, the actual measurement suspension viscosity is 1.056Pa.s, and the suspension gas content rate is 8 %.

[0034]2) Fiber orientation: Press the uniformly dispersed chopped fiber suspension in 1) into the tapered orientation nozzle through the air compressor, the length of the orientation nozzle is 10cm, the included angle of the flow channel is 40°, and the nozzle width of the orientation nozzle is 0.5mm , use the tapered orientation nozzle to orient the short fibers, and continuously feed them into the continuously running conveyor belt to obtain a uniformly distributed fiber-oriented wet mat. Among them, the...

Embodiment 3

[0039] 1) Fiber dispersion: put the chopped fiber, methyl cellulose and water into the mixing tank and stir evenly, the stirring speed is 500r / min, the time is 60min, and the fiber is uniformly distributed in the form of monofilament. Wherein the fiber is chopped polyimide fiber, the length is 6mm, the content (percentage by weight) is 0.2%, the addition of methylcellulose is 6g / L, the actual measurement suspension viscosity is 0.591Pa.s, and the suspension contains gas The rate is 9%.

[0040] 2) Fiber orientation: Press the uniformly dispersed chopped fiber suspension in 1) into the tapered orientation nozzle through the air compressor, the length of the orientation nozzle is 25cm, the included angle of the flow channel is 20°, and the nozzle width of the orientation nozzle is 1.5mm , use the tapered orientation nozzle to orient the short fibers, and continuously feed them into the continuously running conveyor belt to obtain a uniformly distributed fiber-oriented wet mat. ...

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Abstract

The invention belongs to the field of fiber fabric materials, and particularly relates to a preparation method of a chopped-fiber oriented felt. The method comprises the following steps: with water as a main dispersion medium and methylcellulose as an auxiliary dispersion medium, adding a chopped fiber to the dispersion mediums, and stirring and dispersing the mediums to prepare an evenly dispersed chopped-fiber suspension liquid, wherein the length of the chopped fiber is 3-12mm; and treating the obtained evenly dispersed chopped-fiber suspension liquid through a reducing orientation nozzle, orienting the chopped fiber by a reducing liquid, and preparing the chopped-fiber oriented felt through a separating procedure and a drying procedure. According to the method, the problem of environmental pollution caused by an organic solvent dispersion medium in the prior art is solved; and meanwhile, through specific preparation technology and device, the problems of relatively low orientation degree of the chopped fiber, complicated orientation device, low production efficiency and the like in the chopped-fiber oriented felt obtained by the prior art are further solved.

Description

[0001] Technical field: [0002] The invention belongs to the field of fiber fabric materials, in particular to a preparation method of chopped fiber orientation mat. [0003] Background technique: [0004] Chopped fiber reinforced composite materials not only have the advantages of general fiber reinforced composite materials, such as corrosion resistance, fatigue resistance, high specific strength and specific modulus, good thermal stability and designability, but also have simple processing technology, The advantages of lower production costs have attracted more and more attention from industry and academia. The performance of chopped fiber reinforced composites is related to factors such as fiber type, fiber length, fiber content, fiber interface bonding and fiber orientation state. For a specific chopped fiber reinforced composite material, its mechanical properties mainly depend on the orientation state and content of chopped fibers. That is, along the direction of fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H15/02D21H13/50D21H13/40D21H13/26D21H15/10D21H13/20
Inventor 贾晓龙李燕杰罗国昕杨小平尚庭华
Owner BEIJING UNIV OF CHEM TECH
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