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A kind of preparation method of ultrafine lignin

A lignin and ultra-fine technology, applied in the field of preparation of ultra-fine lignin, can solve the problems of low production efficiency and high cost, and achieve the effects of improving production efficiency, improving performance and satisfying market demand.

Active Publication Date: 2020-10-02
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of ultrafine lignin to solve the problems of low production efficiency and high cost in the prior art

Method used

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  • A kind of preparation method of ultrafine lignin
  • A kind of preparation method of ultrafine lignin
  • A kind of preparation method of ultrafine lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step (1): 120-mesh lignin and 325-mesh grinding aid aluminum hydroxide are mixed and stirred evenly in a weight ratio of 30:5;

[0032] Step (2): The mixture obtained in step (1) and 0.8MPa compressed air are simultaneously injected into the jet mill to obtain pulverized materials;

[0033] Step (3): Putting the pulverized material obtained in step (2) into a classifier or a classifying chamber for classifying, the classifying speed is 8000r / min, and the classified particles are obtained;

[0034] Step (4): For the classified particles obtained in step (3), return the particles with a particle size of <4000 mesh to the airflow mill for re-grinding, and discharge the particles with a particle size of ≥4000 mesh from the discharge port, which is the ultrafine Lignin.

[0035] Various parameters for preparing ultrafine lignin are shown in Table 1.

Embodiment 2

[0037] Step (1): 120-mesh lignin and 325-mesh grinding aid aluminum hydroxide are mixed and stirred evenly in a weight ratio of 20:5;

[0038] Step (2): The mixture obtained in step (1) and 0.8MPa compressed air are simultaneously injected into the jet mill to obtain pulverized materials;

[0039] Step (3): Putting the pulverized material obtained in step (2) into a classifier or a classifying chamber for classifying, the classifying speed is 8000r / min, and the classified particles are obtained;

[0040] Step (4): For the classified particles obtained in step (3), return the particles with a particle size of <4000 mesh to the airflow mill for re-grinding, and discharge the particles with a particle size of ≥4000 mesh from the discharge port, which is the ultrafine Lignin.

[0041] Various parameters for preparing ultrafine lignin are shown in Table 1.

Embodiment 3

[0043] Step (1): 120-mesh lignin and 325-mesh grinding aid aluminum hydroxide are mixed and stirred evenly in a weight ratio of 10:5;

[0044] Step (2): The mixture obtained in step (1) and 0.8MPa compressed air are simultaneously injected into the jet mill to obtain pulverized materials;

[0045] Step (3): Putting the pulverized material obtained in step (2) into a classifier or a classifying chamber for classifying, the classifying speed is 8000r / min, and the classified particles are obtained;

[0046] Step (4): For the classified particles obtained in step (3), return the particles with a particle size of <4000 mesh to the airflow mill for re-grinding, and discharge the particles with a particle size of ≥4000 mesh from the discharge port, which is the ultrafine Lignin.

[0047] Various parameters for preparing ultrafine lignin are shown in Table 1.

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Abstract

The invention relates to superfine lignin and a preparation method thereof. The superfine lignin is lignin with granularity of 4000 to 10000 meshes. The preparation method comprises the following steps of feeding the lignin and a grinding additive, crushing by air flow, grading in a superfine way, returning back the coarse grains after grading to crush again, and collecting the product. The preparation method has the advantages that the grinding additive is added in the air flow crushing technology of the lignin, the grinding assisting effect is utilized, the superfine crushing of the lignin is realized, the crushing energy consumption is decreased, and the production efficiency is improved; because the crushing granularity of the grinding additive is smaller than the granularity of the lignin, the grinding additive is attached to the surface of the lignin to coat the lignin, and the good flame-retardant function is realized; by adopting the superfine lignin-filled plastic, foam and other materials, while the cost is reduced and the flame-retardant property is improved, the better mechanical property, heat stability and anti-ultraviolet aging property are realized, and the market requirements can be met.

Description

technical field [0001] The invention belongs to the field of ultrafine powder for filling, and in particular relates to a preparation method of ultrafine lignin. Background technique [0002] Lignin is a natural polymer substance second only to cellulose in the world, and the world produces 6×10 5 Hundreds of millions of tons of lignin, only a small part is used, and most of it is directly burned for energy, which greatly wastes resources. Lignin is a natural aromatic compound with a three-dimensional network structure that is highly cross-linked through carbon-carbon bonds and ether bonds with phenylpropane as the structural unit. [0003] In rubber, plastic, hard foam and other composite materials with polymer materials as the body, a large amount of powder materials are often filled, the purpose is to greatly reduce the cost of the product, and improve the hardness, strength and other aspects of the performance of the composite material. With its advantages of non-toxic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L97/00
CPCC08J3/12C08J2397/00
Inventor 应汉杰邓彤朱晨杰唐成伦李明陈勇吴菁岚柳东沈涛甘涛蒋忠艳
Owner NANJING TECH UNIV
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