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Method for increasing stalk fiberboard surface-density using cotton wood cellulose nano material

A technology of nano-materials and straw fibers, which is applied in the direction of impregnating wood, wood impregnation, wood processing equipment, etc., can solve the problems of low density and poor strength, and achieve the effect of improving surface performance and reducing the amount of surface sanding

Inactive Publication Date: 2010-07-21
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects of pre-cured layer, low density and poor strength on the surface of hot-pressed straw fiberboard, the present invention proposes a method for increasing the surface density of straw fiberboard by using poplar cellulose nanofibrils

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Choose unsanded straw fiberboard; use poplar wood pulp as raw material, prepare poplar wood cellulose nanomaterials dispersed in water through a high-pressure nano homogenizer (pressure is 700bar), and its concentration is 0.5%, that is, the water contains 0.5% The poplar wood cellulose nanometer material; In the poplar wood cellulose nanofibril dispersion liquid, add the powdery phenolic resin that accounts for poplar wood cellulose nano fibril dispersion liquid weight 10% and make treatment liquid; In vacuum treatment tank, Vacuum the unsanded straw fiberboard first (vacuum degree is 0.05MPa),

[0014] Then inject the treatment solution, soak for 60 minutes, and the treatment temperature is room temperature; heat and dry the treated wood / rice (wheat) straw fiberboard to solidify the phenolic resin, and the moisture content of the treated straw fiberboard reaches 6%.

Embodiment 2

[0016] Select unsanded straw fiberboard; use poplar wood pulp as raw material, prepare poplar wood cellulose nanomaterials dispersed in water through a high-pressure nano homogenizer (pressure is 1300bar), and its concentration is 0.75%, that is, the water contains 0.75% The poplar wood cellulose nanometer material; In the poplar wood cellulose nano fibril dispersion liquid, add the powdered phenolic resin that accounts for 20% of poplar wood cellulose nano fibril dispersion liquid weight and make treatment liquid; In vacuum treatment tank, Vacuum the non-sanded straw fiberboard (vacuum degree is 0.07MPa), then inject the treatment liquid, soak for 120min, and the treatment temperature is room temperature; heat and dry the treated wood / rice (wheat) straw fiberboard to make the phenolic The resin is solidified, and the moisture content of the treated straw fiberboard reaches 8%.

Embodiment 3

[0018] Choose unsanded straw fiberboard; use poplar wood pulp as raw material, prepare poplar wood cellulose nanomaterials dispersed in water through a high-pressure nano homogenizer (pressure is 1800bar), and its concentration is 1.0%, that is, the water contains 1.0% The poplar wood cellulose nanometer material; In the poplar wood cellulose nano fibril dispersion liquid, add the powdered phenolic resin that accounts for 30% of poplar wood cellulose nano fibril dispersion liquid weight and make treatment liquid; In vacuum treatment tank, First vacuumize the unsanded straw fiberboard (vacuum degree is 0.09MPa), then inject the treatment liquid, soak for 180min, and the treatment temperature is room temperature; heat and dry the treated wood / rice (wheat) straw fiberboard to make the phenolic The resin is solidified, and the moisture content of the treated straw fiberboard reaches 12%.

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PUM

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Abstract

The invention is a method for improving the surface density of a straw fiber board by using a poplar wood fiber nano-material. The method comprises the steps of selecting a straw fiberboard which is not sanded; using polar wood paper pulp as a raw material; preparing the poplar wood fiber nano-material dispersed in water through a high-pressure nano homogenizer, wherein, the concentration of the poplar wood fiber nano-material is between 0.5% and 1.0%, that is, 0.5%-1.0% of poplar wood fiber nano-material is contained in water; adding powered phenolic resin accounting for 10-30% of the weightof the poplar fiber nano-fibril dispersion into the poplar wood fiber nano-fibril dispersion to obtain a treating fluid; vacuuming ( the degree of vaccum is 0.05-0.09MPa) the straw fiberboard which is not sanded in a vacuum treatment container; injecting the treating fluid; dipping for 60-180min at the room temperature; and heating and drying the treated timber / straw fiberboard. The method has the advantages of reducing the surface sanding amount through improving the surface density of the straw fiberboard, and improving the properties of the straw fiberboard, such as the surface property, the water-resistant property, the strength, etc.

Description

technical field [0001] The invention relates to a method for increasing the surface density of straw fiber boards by using poplar wood cellulose nanometer material. It belongs to the technical field of manufacturing wood-based panels. Background technique [0002] Straw fiberboard is a medium-to-high-density fiberboard manufactured by using rice straw as the main raw material, through preparation, heat grinding, application of urea-formaldehyde resin glue, drying, paving, pre-pressing, hot pressing, cooling, sanding and other processes. Its performance can be Meet the national standard requirements of wood medium and high density fiberboard. In view of the defects of pre-cured layer, low density and poor strength on the surface of the hot-pressed straw fiberboard, sanding is used to remove the pre-cured layer in production to ensure product quality. Contents of the invention [0003] Aiming at the defects of pre-cured layer, low density and poor strength on the surface o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N7/00B27K3/50
Inventor 张洋周定国吴羽飞黄润州吴燕杨蕊刘艳萍沈竹
Owner NANJING FORESTRY UNIV