Manufacturing method of cold plasma modified cellulolytic enzyme lignin/plant fiber composite material

A cold plasma and enzymatic lignin technology, applied in the field of wood composite material manufacturing, can solve the problems of harsh conditions, no industrial production, high energy consumption, etc., and achieve the effects of increased strength, easy operation, and strong controllability

Active Publication Date: 2010-05-26
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today, some lignin adhesives, especially the technology of preparing lignin-phenolic resin adhesives, are also becoming mature, but due to reasons such as high energy consumption, unreasonable process, harsh conditions and strong acid corrosion, they are still Stay in the stage of small or pilot test, no industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The enzymatic hydrolyzed lignin has a moisture content of 6%, and is ground by a high-energy ball mill to produce a powder with a particle size of 200-300 mesh. Then it is placed in the sample chamber of the cold plasma modification equipment, the sample chamber is closed, the vacuum pump is turned on, and a background vacuum of 2Pa is pumped, and then oxygen is introduced, and the vacuum degree is adjusted to 10Pa. Start the radio frequency power supply, adjust the processing power to 100W, and modify the surface of the enzymatically hydrolyzed lignin. The processing time is 30s. Based on the weight of the absolute dry plant fiber, the modified enzymatic lignin with the absolute dry weight accounting for 5% of the absolute dry plant fiber weight is uniformly mixed with cotton stalk fiber (10% moisture content), then spread into a slab for hot pressing and hot pressing Temperature: 160℃, hot pressing pressure: 3.0MPa, hot pressing time: 20s / mm, finished density is 0.95g...

Embodiment 2

[0015] The enzymatic hydrolyzed lignin has a moisture content of 8%, and is ground by a high-energy ball mill to produce powder with a particle size of 200-300 mesh. Then it is placed in the sample chamber of the cold plasma modification equipment, the sample chamber is closed, the vacuum pump is turned on, and the background vacuum is drawn to 2Pa, and then oxygen is introduced, and the vacuum degree is adjusted to 20Pa. Start the radio frequency power supply, adjust the processing power to 200W, and modify the enzymatically hydrolyzed lignin surface. The processing time is 90s. According to the weight of the absolute dry plant fiber, the modified enzymatic lignin with the absolute dry weight accounting for 15% of the absolute dry plant fiber weight is uniformly mixed with cotton stalk fiber (water content 15%), and then spread into a slab for hot pressing and hot pressing Temperature: 190℃, hot pressing pressure: 3.5MPa, hot pressing time: 30s / mm, finished density is 0.95g / c...

Embodiment 3

[0017] The enzymatic hydrolyzed lignin has a water content of 10%, and is ground by a high-energy ball mill to produce powder with a particle size of 200-300 mesh. Then it is placed in the sample chamber of the cold plasma modification equipment, the sample chamber is closed, the vacuum pump is turned on, and the background vacuum is drawn to 4Pa, and then oxygen is introduced, and the vacuum degree is adjusted to 30Pa. Start the radio frequency power supply, adjust the processing power to 300W, and modify the surface of the enzymatically hydrolyzed lignin. The processing time is 150s. According to the weight of the absolute dry plant fiber, the modified enzymatic lignin with the absolute dry weight accounting for 25% of the absolute dry plant fiber weight is uniformly mixed with cotton stalk fiber (water content 20%), and then spread into a slab for hot pressing and hot pressing Temperature: 210℃, hot pressing pressure: 4.0MPa, hot pressing time: 40s / mm, finished density is 0...

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Abstract

The invention discloses a manufacturing method of a cold plasma modified cellulolytic enzyme lignin / plant fiber composite material. The manufacturing method comprises the following steps of: firstly dehydrating and drying the cellulolytic enzyme lignin to be with a moisture content of 6-10 percent; after processing the cellulolytic enzyme lignin into pulverulent bodies with grain diameters of 200-300 mesh by high-energy ball-milling, placing the pulverulent bodies into a sample chamber of cold plasma modified equipment; vacuumizing the sample chamber to 2-4 Pa; introducing oxygen or nitrogen; controlling a vacuum degree to be 10-30 Pa; starting a radio frequency power supply and adjusting treating power to 100-300 W; modifying the cellulolytic enzyme lignin for 30-150 s; uniformly mixing the modified cellulolytic enzyme lignin with the plant fiber, wherein the oven dry weight of the modified cellulolytic enzyme lignin accounts for 5-25 percent of the oven dry weight of the plant fiber; and spreading the mixed modified cellulolytic enzyme lignin and the plant fiber in a plate blank form for thermo-compression, wherein thermo-compression temperature is 160-210 DEG C, and thermo-compression pressure is 3.0-4.0 MPa, and thermo-compression time is 20-40 s / mm. The material contains no free formaldehyde, and can be widely applied to industries, such as architectural decoration, furniture manufacturing, packaging, children toy manufacturing, and the like.

Description

Technical field [0001] The invention relates to a method for preparing a composite material using plant fiber as a raw material and cold plasma modified enzymatic lignin as an intensifier. It belongs to the technical field of wood composite material manufacturing. Background technique [0002] Energy crisis and environmental pollution are the two major problems faced by mankind in the 21st century. The rapid development of China is particularly prominent. Energy is the basis for the survival of modern society and the development of the national economy. The non-renewability of fossil energy (such as oil, coal and natural gas, etc.) as the pillar of energy, and the environmental degradation effect caused by the use process, force people to re-examine and adjust the long-term fossil energy development strategy. Renewable biomass energy has become a hotspot of energy research and development in human society in the 21st century. [0003] In recent years, many scientific researchers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/12B27N3/18
Inventor 周晓燕周定国汤丽娟勇强张伟东郑菲徐勇潘明珠罗海力杨星
Owner NANJING FORESTRY UNIV
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