A method of microwave negative pressure method to reduce formaldehyde emission from wood-based panels

A formaldehyde emission, wood-based panel technology, applied in the direction of manufacturing tools, radiation/wave wood treatment, wood treatment, etc., can solve the problems of slowness, low efficiency, high energy consumption, etc.

Inactive Publication Date: 2017-08-08
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of reducing formaldehyde by ammonia gas and vacuum treatment is extremely slow, consumes a lot of energy and is not efficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The medium density fiberboard produced by poplar wood and urea-formaldehyde glue was selected as the test material, and the formaldehyde emission of wood-based panels before microwave vacuum treatment was measured by 24h dryer method and acetylacetone spectrophotometry. The wood-based panel specimens were placed in an industrial microwave oven, vacuumed and kept at a vacuum degree of -0.02MPa, and microwave vacuum treatment was performed at a temperature of 60°C, a time of 30min, and an input power of 317W using microwaves with a frequency of 2450MHz. After the end, the 24h desiccator method and acetylacetone spectrophotometry were used to measure the formaldehyde emission of the wood-based panel after the treatment. After calculation, the formaldehyde emission of the wood-based panel decreased by 57.34%.

Embodiment 2

[0019] The Ausong board produced with urea-formaldehyde resin adhesive was selected as the test material, and the formaldehyde emission of the wood-based board before microwave vacuum treatment was measured by 24h dryer method and acetylacetone spectrophotometry, and then 15 pieces with a mass of 70±0.5g The wood-based panel specimens were placed in an industrial microwave oven, vacuumed and kept at a vacuum degree of -0.03MPa, and microwave vacuum treatment was performed under the conditions of a temperature of 60°C, a time of 30min, and an input power of 317W using microwaves with a frequency of 2450MHz. After the treatment, the 24h desiccator method and the acetylacetone spectrophotometric method were used to measure the formaldehyde emission of the wood-based panel after the treatment. After calculation, the formaldehyde emission of the wood-based panel decreased by 59.67%.

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PUM

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Abstract

The invention relates to a method for reducing formaldehyde emission quantity of an artificial board through a microwave negative pressure method and belongs to the technical field of formaldehyde reducing of wooden products. The method comprises the following steps that the artificial board is put into an industrial microwave oven; a microwave oven cavity is vacuumized through a vacuum pump or a draught fan, certain negative pressure is kept, and continuous or intermittent microwave treatment is conducted on the artificial board; according to the treatment conditions, the microwave frequency is 2450 MHz or 915 MHz, the microwave treatment temperature is 60+ / -10 DEG C, the treatment time is 40+ / -10 min, and the microwave power is 200+ / -100 W / kg based on the microwave input power of the artificial board of the unit mass. Through the method, the formaldehyde emission quantity of the artificial board can be reduced by 60% to the maximum, and the influence on the main properties of the artificial board is small. In addition, the method is free of pollution, high in efficiency, stable in quality and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of reducing formaldehyde of wood products, and in particular relates to a method for reducing formaldehyde emission from wood-based panels by a microwave negative pressure method. Background technique [0002] Wood-based panels are boards or molded products that are made of wood or other non-wood plants, separated into various unit materials by certain mechanical processing, and glued with or without adhesives and other additives. It mainly includes three categories of products: plywood, particleboard and fiberboard. There are hundreds of extended products and deep-processed products, and the products have a wide range of uses. [0003] At present, urea-formaldehyde resin adhesives, phenolic resin adhesives, and melamine-formaldehyde co-condensation resin adhesives are mainly used as the main raw materials for the production of wood-based panels. Among them, urea-formaldehyde resin adhesives have high bondin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/00
CPCB27K5/0055
Inventor 朱新华杨培郭文川
Owner NORTHWEST A & F UNIV
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