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Chopped fiber dispersion and preparation method thereof

A short-cut fiber and dispersion technology, which is applied in the field of fiber fabric materials, can solve problems such as easy agglomeration, poor hydrophilicity, and poor dispersion, and achieve the effects of high production efficiency, improved dispersion, and mild conditions

Active Publication Date: 2016-08-03
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of chopped fiber dispersion and preparation method thereof, adopt the joint effect of bio-based source surface modifier dopamine and bio-based thickener to solve the problem that the fiber surface is chemically inert and has poor hydrophilicity, Prone to agglomeration and poor dispersion in water

Method used

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  • Chopped fiber dispersion and preparation method thereof
  • Chopped fiber dispersion and preparation method thereof
  • Chopped fiber dispersion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of chopped fiber dispersion of the present invention and preparation method thereof, it is characterized in that comprising following operation steps:

[0026] (1) Surface modification process: First, immerse the chopped carbon fiber (fiber length: 4mm) in water and ultrasonicate for 40min. Sonicate for 10 seconds, and add a dopamine modifier, the amount of which is 5% of the amount of chopped carbon fiber added, and use Tris-HCl to adjust the pH value of the solution to 8.5, and ultrasonically react at room temperature (25°C) for 6h to obtain Dopamine modified chopped carbon fiber; wherein, after dopamine modified chopped carbon fiber, its surface hydroxyl content is 0.1% (mass percentage content, the same as the following examples), and the amino content is 0.05% (mass percentage content, the same as the following examples); and Carbon fiber and carbon fiber contact angle characterization after dopamine modification, the contact angle of carbon fiber and water ...

Embodiment 2

[0029] A kind of chopped fiber dispersion of the present invention and preparation method thereof, it is characterized in that comprising following operation steps:

[0030] (1) Surface modification process: first, immerse chopped glass fiber (fiber length: 8mm) in water and ultrasonicate for 20min, the ultrasonic power is 400w, then reduce the ultrasonic power to 150w, add dopamine modifier, its addition amount is 50% of the added amount of chopped glass fiber, and adjust the pH value of the solution to 9.0 with Tris-HCl, and react ultrasonically at room temperature (25° C.) for 12 hours to prepare dopamine-modified chopped fiber. Ultrasound is used for 10 seconds every 50 seconds; wherein, the surface hydroxyl content of the dopamine-modified chopped glass fiber is 4.5%, and the amino group content is 1.0%; and the chopped glass fiber and the chopped glass fiber modified by dopamine are contacted The contact angle between glass fiber and water is 130.3°, and the contact angl...

Embodiment 3

[0033] A kind of chopped fiber dispersion of the present invention and preparation method thereof, it is characterized in that comprising following operation steps:

[0034] (1) Surface modification process: first, immerse the chopped polyimide fiber (fiber length: 0.05 mm) in water and ultrasonicate for 5 minutes, the ultrasonic power is 200w, ultrasonic for 10 seconds every 40 seconds, and then reduce the ultrasonic power to 50w, ultrasonication for 10 seconds every 60 seconds, then add dopamine modifier, its addition is 10% of the addition of chopped polyimide fibers, and adjust the pH value of the solution to 8.0 with Tris-HCl, at room temperature ( 22 ℃) ultrasonic reaction 10h, make dopamine modified chopped polyimide fiber; Wherein, its surface hydroxyl content after dopamine modified chopped polyimide fiber is 0.23%, amino content is 0.09%; And to short The contact angle of cut polyimide fiber and dopamine-modified chopped polyimide fiber was characterized. The contact...

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Abstract

The invention discloses chopped fiber dispersion and a preparation method thereof and belongs to the field of fiber fabric materials. A bio-based source surface modifier and a bio-based thickener are adopted for synergistically acting to facilitate dispersion of chopped fibers in water. The bio-based source surface modifier is dopamine. The bio-based thickener is one or more of methylcellulose, hydroxyethyl cellulose, hydroxy propyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose, gelatin and sodium lignin sulfonate. According to the chopped fiber dispersion and the preparation method thereof, the content range of hydroxyl and amidogen on the surfaces of the fibers is adjusted and controlled effectively, so that the surface activity hydrophilia of the fibers are improved significantly, and thus the dispersibility of the fibers in the water is improved greatly. The dopamine and the bio-based thickener are both environmentally friendly low-cost materials; and when the dopamine and the bio-based thickener are used for fiber surface modification, the conditions are mild, control is easy, and the production efficiency is high. The dispersibility of the prepared chopped fibers in the water is excellent, and preparation of fiber paper or fibrofelt and other products with the uniform structure is facilitated.

Description

technical field [0001] The invention belongs to the field of fiber fabric materials, in particular to a chopped fiber dispersion and a preparation method thereof. Background technique [0002] 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. [0003] Most chopped fibers, including carbon fibers, glass fibers, etc., have strong hydrophobic properties on their surfaces, and have a strong tendency to flocculate during the production of chopped fiber products. Therefore, chopped fibers in water or dispersion media Uniform dispersion is the premise and key to prepare high-performance chopped fiber products. [0004] Gener...

Claims

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Application Information

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IPC IPC(8): B29C70/12B08B3/12
CPCB08B3/12B29C70/12
Inventor 贾晓龙李燕杰罗国昕尚庭华杨小平
Owner BEIJING UNIV OF CHEM TECH
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