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Method for processing wood fibers by plasma for reinforcing interface bonding capacity of fiber plate

A plasma and wood fiber technology, applied in wood treatment, electric wood treatment, wood treatment details, etc., can solve the problems of formaldehyde harmful to health, weak bonding ability of wood fiber/lignin interface, waste water pollution, etc., and achieve short treatment cycle , good gluing effect and low energy consumption

Inactive Publication Date: 2017-08-04
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] The invention aims to solve the problems of formaldehyde harmful to health in the traditional wood-based panel industry, waste water pollution in the pulp and paper industry, and weak bonding ability of the wood fiber / lignin interface, thereby providing a method for enhancing the bonding ability of the wood fiber and lignin interface by plasma treatment, improving the Method for mechanical strength of fiberboard based on lignin binder

Method used

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specific Embodiment approach 1

[0023] Specific embodiment one: a kind of method that utilizes plasma to improve wood fiber and lignin to strengthen the interfacial bonding performance described in this embodiment is specifically carried out according to the following steps:

[0024] One, select an appropriate amount of wood fiber, place it in an oven to dry, and obtain wood fiber with a certain moisture content (12%-16%);

[0025] 2. Open the plasma generator reactor, and evenly disperse the dried wood fiber in step 1 in the reactor, while ensuring that the reactor still has a certain volume that has not been fully filled;

[0026] 3. Close the reactor, turn on the plasma generator, and adjust the working parameters of the CTP-2000K plasma power supply: the output voltage is 50V, and the output frequency is 10Hz;

[0027] 4. Surface treatment of gas medium for a period of 2-4 minutes;

[0028] 5. Control the power of the plasma generator and the temperature in the reactor to 200-240°C, and the heating rate...

specific Embodiment approach 2

[0038] Specific embodiment two: what this embodiment is different from specific embodiment one is: the reaction treatment time is 2min in the step 4, and the surface free radical content of wood fiber increases in this reaction time, and action time is short, and efficient is high, handles more fully simultaneously , The weak boundary of wood fiber and lignin surface is removed in large pieces, which makes the surface of the material undulate and rough, and the bond is broken to form free radicals. Etching has a significant effect on improving adhesion and hygroscopicity. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and one of specific embodiments one to four is that the gas in step six is ​​oxygen, and the amount of oxygen entering the reactor can be controlled by controlling the size of the air inlet, thereby ensuring that the wood fiber and wood The elements can be fully treated, so that the heat treatment chamber is oxygen, without the influence of nitrides or carbides, and also avoids toxic gases produced by low-frequency ionization. wood burning. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for processing wood fibers by plasma for reinforcing the interface bonding capacity of a fiber plate, relates to a method for preparing the fiber plate by blending and hot pressing, and mainly solves the problems that a conventional manufacturing method of wood fiber products harms the environment, and is high in cost and inadequate in processing. The method comprises the following steps of I, drying the wood fibers until the water ratio of the dried wood fibers is 8%-15%; II, placing the dried wood fibers in a reaction kettle, turning on a plasma generator, and adjusting the working parameters of a plasma power source to be 50-60V and 10-25Hz; III, performing gaseous medium surface treatment, and controlling the injecting capacity of gaseous mediums to be 2-3L / h; IV, maintaining the stable plasma state for 2.5-5min; V, turning off the plasma generator, and opening the reaction kettle; and VI, taking out the wood fibers from the reaction kettle, so as to obtain a finished product, wherein high mechanical properties between the finished product and xylogen are obtained, and the bonding capacity of the finished product and the xylogen is improved by about 30%. According to the method disclosed by the invention, the plasma is adopted to process wood fibers so that the interface bonding capacity is reinforced; no chemical preservative is added; the technology is succinct; and the product is green and pollution-free, and is beneficial to environmental protection.

Description

technical field [0001] The invention relates to a method for enhancing the bonding performance of wood fiber and lignin interface, thereby improving the mechanical strength of wood fiber boards. Background technique [0002] At present, the unqualified phenomenon of wood-based panel products due to excessive formaldehyde emission is common. How to reduce the formaldehyde emission of wood-based panels has become a hot research issue for wood-based panels. The methods to reduce formaldehyde emission are mainly to add free formaldehyde scavenger in production, vacuum ammonia gas treatment, etc., but the cost of aldehyde reduction method is high and the effect of aldehyde reduction is unstable. The use of formaldehyde-free adhesives instead of traditional formaldehyde-containing adhesives is a measure to fundamentally solve the problem of formaldehyde release. [0003] Industrial lignin is the main component of waste liquid produced by pulp and paper industry, and most of it is...

Claims

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Application Information

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IPC IPC(8): B27N3/12B27K5/00
CPCB27N3/12B27K5/002B27K2200/15
Inventor 杜文鑫郭明辉
Owner NORTHEAST FORESTRY UNIVERSITY
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