Method for modifying poplar fiber by silicon-phosphorus sol

A technology of poplar fiber and phosphorus sol, which is applied in wood processing appliances, manufacturing tools, etc., can solve the problems of easy moisture absorption, decay and flammability of wood fiber, and achieve the effect of easy moisture absorption.

Inactive Publication Date: 2010-12-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a method for modifying poplar wood fiber with silicon-phosphorus sol, and its purpose is to solve the problems that wood fiber is easy to absorb moisture, easy to decay, and flammable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Preparation of poplar wood fiber: After peeling and slicing the raw material poplar wood, it is preheated and cooked, sent to a heat grinder for processing into fibers, and then dried to a moisture content of 2%.

[0013] 2. Preparation of silicon-phosphorus sol: ethyl orthosilicate (TEOS), absolute ethanol (EtOH), water (H 2 O), phosphoric acid (H 3 PO 4 ), dipotassium hydrogen phosphate (K 2 HPO 4 ) according to the molar ratio of 1:2:10:0.4:0.04 into the Erlenmeyer flask, at room temperature, vigorously stirred for 1 hour to obtain a transparent sol, which is used for the treatment of wood fiber.

[0014] 3. Poplar fiber modification: poplar fiber was extracted with acetone and tap water for 24 hours in a Soxhlet extractor, and dried at 80°C until constant weight. Then put the treated poplar fiber into a self-made treatment tank to vacuumize and maintain a vacuum of 0.097MPa. After 25 minutes, add silicon-phosphorus sol and continue to maintain negative pressu...

Embodiment 2

[0017] 1. Preparation of poplar wood fiber: After peeling and slicing the raw poplar wood, it is preheated and cooked, sent to a heat grinder to process into fibers, and then dried to a moisture content of 3%.

[0018] 2. Preparation of silicon-phosphorus sol: ethyl orthosilicate (TEOS), absolute ethanol (EtOH), water (H 2 O), phosphoric acid (H 3 PO 4 ), dipotassium hydrogen phosphate (K 2 HPO 4 ) according to the molar ratio of 1:2:30:0.4:0.12 into the Erlenmeyer flask, at room temperature, vigorously stirred for 1 hour to obtain a transparent sol, which is used for the treatment of wood fiber.

[0019] 3. Poplar fiber modification: Poplar fiber was extracted with acetone and tap water for 26 hours in a Soxhlet extractor, and dried at 80°C to constant weight. Then put the treated poplar fiber into a self-made treatment tank to evacuate and maintain a vacuum degree of 0.097Mpa. After 20 minutes, add silicon-phosphorus sol and continue to maintain negative pressure for 5 m...

Embodiment 3

[0022] 1. Preparation of poplar wood fiber: After peeling and slicing the raw poplar wood, it is preheated and cooked, sent to a heat mill to process into fibers, and then dried to a moisture content of 3%.

[0023] 2. Preparation of silicon-phosphorus sol: ethyl orthosilicate (TEOS), absolute ethanol (EtOH), water (H 2 O), phosphoric acid (H 3 PO 4 ), dipotassium hydrogen phosphate (K 2 HPO 4 ) according to the molar ratio of 1:2:50:0.4:0.2 into the Erlenmeyer flask, at room temperature, stirred vigorously for 1 hour to obtain a transparent sol, which is used for the treatment of wood fiber.

[0024] 3. Poplar fiber modification: Poplar fiber was extracted with acetone and tap water for 20 hours in a Soxhlet extractor, and dried at 80°C to constant weight. Then put the treated poplar fiber into a self-made treatment tank to evacuate and maintain a vacuum degree of 0.097Mpa. After 30 minutes, add silicon-phosphorus sol and continue to maintain negative pressure for 10 minu...

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PUM

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Abstract

The invention relates to a method for modifying poplar fiber by silicon-phosphorus sol, which is characterized by comprising the following process steps of preparing the poplar fiber and the silicon-phosphorus sol and modifying the poplar fiber. The invention has the advantages that wood fiber is used as a research target, tetraethoxysilane is taken as an initiator, phosphoric acid is taken as an additive and a catalyst, and potassium acid phosphate is added to prepare the sol with a unique proportioning relation. The invention adopts a sol-gel technology for modifying the poplar fiber and proposes a unique an optimizing process. The modification of the poplar fiber proposed in the invention starts from changing the structure of a material in a cell/nano level, thus providing a new train of thought for fundamentally solving the problems of easy moisture absorption, easy decay, flammability and the like of the wood fiber and fiber boards thereof.

Description

technical field [0001] The invention relates to a method for modifying poplar fiber with silicon-phosphorus sol, and belongs to the technical field of poplar fiber / nano composite material. Background technique [0002] Plant fiber is a kind of hydrophilic material, and the wood composite material made of plant fiber without waterproof treatment has great hygroscopicity and water absorption, and the dimensional stability of the product is poor. After the board absorbs water, it will deform, reduce its strength, increase heat transfer and electrical conductivity, and it is easy to decay, which affects the use range and service life of the material. In addition, wood is a flammable material, and wood composites made of it also have this fatal flaw, thus limiting the scope of use of wood composites. So far, many researchers in the wood industry have done a lot of research work on the modification of wood composite materials, in order to improve the dimensional stability, corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27L11/08
Inventor 徐莉曹文静姜维娜唐志号李杰
Owner NANJING FORESTRY UNIV
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