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Efficient formaldehyde reduction method

A technology for reducing formaldehyde and high efficiency, applied in the field of free formaldehyde reducing formaldehyde technology, can solve the problems of shortened storage period, high equipment cost, long processing time, etc. Effect

Inactive Publication Date: 2018-01-16
魏喜成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are many insurmountable shortcomings in the first to third methods above, such as the decline of physical and mechanical properties, the increase of adhesive cost, the shortening of storage period, the increase of hot pressing time, and the reduction of production capacity, etc.
[0008] The fourth method, such as using a large-volume sealed chamber to treat ammonia at atmospheric pressure, has a less than ideal effect of reducing aldehydes, and the treatment time is long, and the cost of equipment is high, so it is difficult to popularize and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put the wood-based panel with a formaldehyde emission of 35.0mg / 100g (drilling method), a thickness of 18mm, and a density of 690kg / m3 on the panel loading vehicle, and send it into a sealed container through the guide rail, close the sealed door of the container, and open the steam system Introduce high-temperature steam at 120°C, and at the same time turn on the ventilation system to continuously extract the high-temperature steam from the sealed container, adjust the flow rate of the steam system and the ventilation system to keep the pressure in the sealed container at 0.2MPa, open the sealed container after 5 minutes, and remove the man-made board out. The free aldehyde emission of the plate after treatment is 4.2mg / 100g.

Embodiment 2

[0019] Put the wood-based panel with a formaldehyde emission of 16.7mg / 100g (drilling method), a thickness of 15mm, and a density of 780kg / m3 on the panel loading vehicle, and send it into a sealed container through the guide rail, close the sealed door of the container, and turn on the steam The system is fed with 140°C high-temperature steam, and at the same time, the ventilation system is turned on to continuously extract the high-temperature steam from the sealed container, and the flow rate of the steam system and the ventilation system is adjusted to keep the pressure in the sealed container at 0.3MPa. After 10 minutes, the sealed container is opened, and the Wood-based panels are removed. The free aldehyde emission of the treated plate is 3.8mg / 100g.

[0020] In the above two embodiments, the extracted high-temperature steam is cooled to room temperature and then passed into ammonia water to neutralize the formaldehyde therein.

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Abstract

The invention discloses an efficient formaldehyde reduction method. Formaldehyde is reduced by using a method that high-temperature vapor is continuously introduced and extracted. As formaldehyde is easy to volatilize at high temperature and dissolved in water, formaldehyde in plates can be greatly volatilized and dissolved in vapor, the high-temperature vapor is recycled, and the purpose of reducing formaldehyde is achieved. The method is applicable to artificial plates of various types and thickness and is good in formaldehyde reduction effect. Equipment is low in manufacturing difficulty and relatively low in cost; when formaldehyde of artificial plates is removed, the operation is implemented easily, a great number of plates can be treated, and the formaldehyde reduction cost is low; due to the high-temperature vapor, moisture contacting the plates can be rapidly evaporated, then the plates can be kept dry, and the convention that formaldehyde is not absorbed by using water directly as the artificial plates can be wetted and moistened by water in the production process is overcome.

Description

technical field [0001] The invention relates to a free formaldehyde reduction process for wood-based panels using a urea-formaldehyde resin adhesive, in particular to a highly efficient formaldehyde reduction method. Background technique [0002] There are generally four ways to reduce formaldehyde emission from wood-based panels: [0003] 1. Use urea-formaldehyde resin with high urea-formaldehyde molar ratio. When synthesizing urea-formaldehyde resin, appropriately increasing the molar ratio of urea: formaldehyde in raw materials can reduce the free formaldehyde content of resin and wood-based panels to a certain extent. [0004] 2. Use formaldehyde scavenger. Under certain conditions, these capture agents can chemically react with formaldehyde to generate another stable new substance, or absorb formaldehyde stably. Commonly used formaldehyde capture agents include urea, polyvinyl alcohol, melamine, ammonia water, p-toluamide, phenol, hydroquinone, peroxide, bark powder,...

Claims

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Application Information

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IPC IPC(8): B27K5/00
Inventor 魏喜成
Owner 魏喜成