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Method for directly preparing membrane through wood fiber

A wood fiber, direct technology, applied in the field of direct preparation of wood fiber film, can solve the problems of long time, high temperature, high energy consumption, etc., and achieve the effect of increasing yield, preventing damage, and good film performance

Inactive Publication Date: 2015-09-09
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oil bath or microwave heating and dissolving process has high temperature, long time, high energy consumption, and the degradation of wood fiber to a certain extent, which limits its industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 2g of crushed pineapple leaf fiber to 100g of 1-butyl-3-methylimidazolium chloride salt ionic liquid, and then pass through a vacuum homogenizing emulsifier at 100°C and 16000rpm for 2 cycles, so that the pineapple leaf fiber Dissolve in the ionic liquid, and use a centrifuge to centrifuge at 4500rpm for 10 minutes to remove the mixed liquid impurities and degas to obtain the pineapple leaf fiber / ionic liquid homogeneous solution. The lignocellulosic fiber in the solution is measured after being regenerated, and the yield is 95.4%. Weigh 25g of the homogeneous solution and pour it into the mold, let it stand for 5 hours after being horizontal, soak it in deionized water for 24 hours, change the water four times during this period, then apply the glycerin solution evenly on the surface of the membrane, drain off the excess glycerin, and transfer to Dry in an oven at 40°C. The concentration of glycerin applied is 30%. The prepared film is transparent and uniform, ha...

Embodiment 2

[0028] Add 6g of crushed bagasse to 100g of 1-allyl-3-methylimidazolium chloride salt ionic liquid, and then circulate through a vacuum homogenizer at 80°C and 18,000rpm twice to dissolve the bagasse In the ionic liquid, use a centrifuge to centrifuge at 4000 rpm for 15 minutes to remove impurities and degas to obtain a bagasse fiber / ionic liquid homogeneous solution. After the wood fiber in the solution is regenerated, the yield is 90.3%. Weigh 25g of the homogeneous solution and pour it into the mold, let it stand for 6 hours after being horizontal, soak it in deionized water for 24 hours, change the water four times during this period, then apply the glycerin solution evenly on the surface of the membrane, drain off the excess glycerin, and transfer to Dry in an oven at 40°C. The concentration of glycerol applied is 1%. The prepared film is transparent and uniform, has good strength and excellent mechanical properties.

Embodiment 3

[0030] Add 3g of pulverized cotton fibers into 50g of 1-allyl-3-methylimidazolium chloride salt ionic liquid, and then circulate through a vacuum homogenizer at 80°C and 15,000rpm for 3 times to dissolve the cotton fibers In the ionic liquid, use a centrifuge to centrifuge at 5000 rpm for 15 minutes to remove impurities and degas to obtain a cotton fiber / ionic liquid homogeneous solution. After the lignofiber in the solution is regenerated, the yield is 92.3%. Weigh 20g of the homogeneous solution and pour it into the mold, let it stand for 5 hours after being horizontal, soak it in deionized water for 24 hours, change the water four times during this period, then apply the glycerin solution evenly on the surface of the membrane, drain off the excess glycerin, and transfer to Dry in an oven at 50°C. The concentration of glycerin applied is 50%. The prepared film is transparent and uniform, has good strength and excellent mechanical properties.

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PUM

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Abstract

The invention provides a method for directly preparing a membrane through wood fiber. The method includes the following steps: (1), mixing ion liquid and the wood fiber, and performing vacuum homogeneous emulsification cutting to enable the wood fiber to be dissolved in the ion liquid; (2), centrifuging a mixed solution to remove impurities and bubbles to obtain a wood fiber or ion liquid homogeneous phase solution system; (3), adding supernate after centrifuging into a die coated by polytetrafluoroethylene, horizontally standing, using deionized water for soaking after membrane liquid is basically solidified and formed, and uniformly smearing glycerin on the surface before drying. By the method, complex pretreatment is not needed, so that energy and time are saved, lignose and hemicellucose which are retained give functionality to the membrane, and the wood fiber is utilized comprehensively.

Description

technical field [0001] The invention belongs to the field of wood fiber processing, and in particular relates to a method for directly preparing a film from wood fiber. Background technique [0002] In recent years, with the deterioration of energy crisis and environmental problems, degradable biomaterials have received more and more attention. Natural fibers are gradually playing an increasingly important role due to their superior properties such as light weight, degradability, low cost, high modulus, and high strength. In order to solve the problem of white pollution, researchers focus on using wood fiber to prepare various functional films, such as mulch film and plastic wrap. Since the lignin, hemicellulose and cellulose in the lignocellulosic components are closely combined, it is not conducive to the dissolution and film formation of the lignofibers. Therefore, the currently commonly used method is to remove the lignin and hemicellulose and use the fiber Prepared in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08J9/40C08J5/18C08J3/02C08L97/02
Inventor 魏晓奕常刚向佳晴付调坤王飞李积华
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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