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

A technology of cold plasma and enzymolysis of lignin, which is applied in the field of wood composite material manufacturing to achieve the effects of increased strength, easy operation and strong controllability

Active Publication Date: 2011-05-11
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 the large energy consumption, unreasonable process, harsh conditions and strong acid corrosion, etc. 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

[0014] The moisture content of the enzymatic lignin is 6%, and it is ground into a powder with a particle size of 200-300 mesh by a high-energy ball mill. Then place it in the sample chamber of the cold plasma modification equipment, close the sample chamber, turn on the vacuum pump, draw to a background vacuum of 2Pa, then introduce oxygen, and adjust the vacuum degree to 10Pa. Start the RF power supply, adjust the processing power to 100W, and modify the surface of the enzymatic lignin. The processing time is 30s. Based on the weight of the dry plant fiber, evenly mix the modified enzymatic lignin whose dry weight accounts for 5% of the dry plant fiber weight with cotton stalk fibers (with a moisture content of 10%), and lay it into a slab for hot pressing. Temperature: 160°C, hot pressing pressure: 3.0MPa, hot pressing time: 20s / mm, made density 0.95g / cm 3 , a plate with a thickness of 6mm. After testing, its static bending strength is 19.1MPa, its elastic modulus is 188...

Embodiment 2

[0016] The moisture content of the enzymatic lignin is 8%, and it is ground into a powder with a particle size of 200-300 mesh by a high-energy ball mill. Then place it in the sample chamber of the cold plasma modification equipment, close the sample chamber, turn on the vacuum pump, draw to a background vacuum of 2Pa, then introduce oxygen, and adjust the vacuum degree to 20Pa. Start the RF power supply, adjust the processing power to 200W, and modify the surface of the enzymatic lignin. The processing time is 90s. Based on the weight of the dry plant fiber, the modified enzymatic lignin whose dry weight accounts for 15% of the dry plant fiber weight is evenly mixed with cotton stalk fibers (water content 15%), and then paved into a slab for hot pressing. Temperature: 190°C, hot pressing pressure: 3.5MPa, hot pressing time: 30s / mm, and the density is 0.95g / cm 3 , a plate with a thickness of 6mm. After testing, the static bending strength is 25.9MPa, the elastic modulus is ...

Embodiment 3

[0018] The moisture content of the enzymatic lignin is 10%, and it is ground by a high-energy ball mill to make a powder with a particle size of 200-300 mesh. Then place it in the sample chamber of the cold plasma modification equipment, close the sample chamber, turn on the vacuum pump, draw to a background vacuum of 4Pa, then introduce oxygen, and adjust the vacuum to 30Pa. Start the RF power supply, adjust the processing power to 300W, and modify the surface of the enzymatic lignin. The processing time is 150s. Based on the weight of the dry plant fiber, the modified enzymatic lignin whose dry weight accounts for 25% of the dry plant fiber weight is evenly mixed with cotton stalk fibers (water content 20%), and then paved into a slab for hot pressing. Temperature: 210°C, hot pressing pressure: 4.0MPa, hot pressing time: 40s / mm, and the density is 0.95g / cm 3 , a plate with a thickness of 6mm. After testing, its static bending strength is 22.7MPa, its elastic modulus is 21...

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Abstract

The invention discloses a manufacturing method of a composite material by a cold plasma modified cellulolytic enzyme lignin and plant fiber. 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 making a composite material by using plant fibers as raw materials and cold plasma modified enzymatic lignin as a reinforcing agent. The invention belongs to the technical field of wood composite material manufacturing. [0002] Background technique [0003] Energy crisis and environmental pollution are two major problems faced by mankind in the 21st century, especially in the rapidly developing China. Energy is the basis for the survival of modern society and the development of national economy. The non-renewability of fossil energy (such as oil, coal, and natural gas, etc.) as the backbone of energy, and the environmental degradation effect brought about by the use process, force people to re-examine and adjust the long-term implementation of fossil energy development strategies. Renewable biomass energy has become a hot spot in energy research and development of human society in the 21st century. [0004] In ...

Claims

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Application Information

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Patent Type & Authority Patents(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