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Fibrillation dissolving pulp, method for making same and applications

A technology of fibrillation and pulp, which is applied in the field of fibrillation pulp and its preparation, can solve the problems of difficult simultaneous control of pulp length and fibrillation degree, fibrils, main fiber entanglement, and difficulty in dispersing, etc., to achieve The process has a wide range of use, great flexibility, and the effect of saving energy

Active Publication Date: 2009-03-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high rigidity of para-aramid fibers, pulp is prepared by mechanical methods, and the mechanical force often cuts the fibers seriously when the fibers do not form a rich fibrillation structure, or under the action of mechanical forces that can maintain a certain fiber length, Fibrils appear, the main fiber is seriously entangled, and it is difficult to achieve dispersion
It is difficult to control the length of pulp and the degree of fibrillation at the same time by mechanical means

Method used

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  • Fibrillation dissolving pulp, method for making same and applications
  • Fibrillation dissolving pulp, method for making same and applications
  • Fibrillation dissolving pulp, method for making same and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 15g para-aramid chopped fiber ( 2-4 mm in length, 15 μm in diameter), soaked in 70% sulfuric acid for 8 minutes, and the soaking concentration is 0.1% w.t. After soaking, take out the fibers and rinse them with clean water until neutral. PFI is used for refining, the refining concentration is 10%, the refining distance is 2mm, and the number of refining revolutions is 10,000 rpm to prepare pulp. The process is shown in figure 2 , the properties of pulp are shown in Table 2.

[0041] The water retention value of the pulp of this embodiment is 104.2%, which is 8.2 percentage points higher than that of the pulp of Comparative Example 1. From the side, the degree of fibrillation of the pulp of this embodiment is higher than that of the pulp of Comparative Example 1. Pretreatment Play a more ideal effect. This embodiment pulp sees image 3 B, contrast with comparative example 1 pulp (see image 3 A), the degree of fibrillation of the pulp in this example is much higher,...

Embodiment 2

[0043] The pulp preparation process of this embodiment is the same as that of Example 1, the difference is that the concentration of sulfuric acid used for pretreatment is 10%. For the process, see figure 2 , the properties of pulp are shown in Table 2.

Embodiment 3

[0045] The pulp preparation process of this embodiment is the same as that of Example 1, the difference is that the concentration of pretreatment sulfuric acid used is 60%, and the process is shown in figure 2 , the properties of pulp are shown in Table 2.

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Abstract

The invention discloses a method for preparing fibrillation pulp. The method comprises the following steps: (1) pre-treating chopped fibers by a pre-treating agent; (2) Controlling the concentration of the chopped fibers to between 0.1 and 30 weight percent, and jordaning the chopped fibers in the jordaning equipment to obtain the pulp; and (3) dewatering and storing the pulp. The fibrillation pulp prepared by the method can be applied to friction materials, reinforcing materials, battery membranes, PCB base materials, honeycomb core materials or high-performance paper. The method has the advantages that with the method, the key technical problem in the fibrillation pulp preparing process is effectively solved, and the method is wider in application range; the method can effectively improve the preparing efficiency of the fibrillation pulp and save energy consumption; and by the concrete adjustment of process including the pre-treating agent, the pre-treating condition and the jordaning process, the fibrillation pulp meeting the service condition can be prepared according to the service requirement of products, so the method has larger flexibility.

Description

technical field [0001] The invention relates to fiber pulping technology and papermaking technology, in particular to a fibrillated pulp and its preparation method and application. technical background [0002] For some man-made fibers and synthetic fibers, fibrillation means that when the fiber is subjected to mechanical force, the original smooth fiber surface is destroyed, and the nano-scale fibrils or fibril bundles inside the fiber are exposed and attached to the main fiber. Partially detached from the main body of the fiber. The fibrillated para-aramid (PPTA) and poly-p-phenylene benzoxazole (PBO) pulp not only retains the physical properties of the fiber such as high temperature resistance, wear resistance, high strength, low creep performance, and excellent electrical properties, And has a high degree of dispersion, is a very good composite material, is widely used in rubber reinforcement materials, printed circuit board substrates, high-performance honeycomb core m...

Claims

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Application Information

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IPC IPC(8): D01D1/02
Inventor 胡健王宜梁云王习文曾抒姝
Owner SOUTH CHINA UNIV OF TECH
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