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Electron beam radiation technology capable of reducing formaldehyde emission of urea-formaldehyde glue artificial boards

A technology of formaldehyde emission and electron beam radiation, applied in the field of material post-processing, can solve the problem of not keeping up with the continuous production method and speed of wood-based panels, and achieve the effect of improving the grade of the board, reducing the emission of formaldehyde, and positive social benefits.

Active Publication Date: 2015-03-25
同威信达技术(江苏)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former method of adjusting the formula, if formaldehyde / urea is still used as the main raw material, generally can only meet the requirements of E2-grade wood-based panels; while the ammonia post-treatment technology can make the formaldehyde emission of the panels reach E1, but the treatment process requires the panel Send it into the vacuum chamber for ammonia seepage and then take it out. The working process is cumbersome and intermittent, which often cannot keep up with the continuous production mode and speed of the wood-based panel assembly line.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Select 4 pieces of 18mm thick urea-formaldehyde glue particle board newly produced by a factory within 2 months, with a density of 0.66g / cm 3 , two of which are not irradiated, and the other two are irradiated separately. The electron radiation conditions are: the maximum kinetic energy of the outlet electrons is about 5MeV, the total radiation dose is 5kGy, and the dose rate is 100Gy / s. The formaldehyde emission of the plate is measured by the dryer method before and after radiation. . Before the radiation, the board could not even reach the E2 standard, and the formaldehyde emission of the wood-based board after the electron beam radiation decreased by about 15%.

Embodiment 2

[0016] Select 4 pieces of 18mm thick urea-formaldehyde glue particle board newly produced in a factory within 2 months, with a density of 0.66g / cm3, 2 of which are not irradiated, and the other 2 are stacked together for radiation. The electron radiation condition is: the maximum kinetic energy of the export electron is about 8MeV , the total radiation dose is 10kGy, the dose rate is 500Gy / s, and the formaldehyde emission of the plate is measured by the dryer method before and after radiation. The formaldehyde emission of the wood-based panels irradiated by electron beams decreased by about 22%.

Embodiment 3

[0018] Select 6 pieces of 18mm thick urea-formaldehyde glue particle board newly produced in a certain factory within 2 months, with a density of 0.66g / cm3, 3 of which are not irradiated, and the other 3 are stacked together for radiation. The electron radiation condition is: the maximum kinetic energy of the export electron is about 10MeV , the total radiation dose is 20kGy, the dose rate is 1000Gy / s, and the formaldehyde emission of the plate is measured by the dryer method before and after radiation. The formaldehyde emission of wood-based panels decreased by about 28% after electron beam irradiation.

[0019] Cost accounting:

[0020] According to the dose requirement of 10kGy or slightly higher required by the finished wood-based panel, the development level of the current electron accelerator technology has easily reached the electron kinetic energy of 10MeV, and the dose rate can reach the order of kGy / s. The desired dose is already achieved within seconds. Therefore,...

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PUM

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Abstract

The invention belongs to the field of material postprocessing, and particularly relates to an electron beam radiation technology capable of reducing the formaldehyde emission of urea-formaldehyde glue artificial boards. The technology is particularly characterized in that an independent conveying-belt type radiation chamber is arranged, a high-energy electron accelerator is installed in the radiation chamber, the finished urea-formaldehyde glue artificial boards are directly radiated in air without adding other assistants, and therefore the formaldehyde emission of the finished urea-formaldehyde glue artificial boards is reduced. By means of the technology, the artificial boards can be rapidly processed in a production-line mode, and the formaldehyde emission can be reduced; in addition, the cost of the technology is similar to the cost of an ammonia processing method, but the formaldehyde emission of the urea-formaldehyde glue artificial boards is remarkably reduced, the board level is improved, and the high economical value is achieved for a factory; broad ordinary people can enjoy healthy living environments, and the positive social benefits are achieved.

Description

technical field [0001] The invention belongs to the field of post-treatment of materials, and in particular relates to an electron beam radiation process for reducing the formaldehyde emission of urea-formaldehyde glue-based wood-based panels. Background technique [0002] Restricted by the level of economic development, urea-formaldehyde wood-based panels still occupy the mainstream in my country at present, and are widely used in indoor home decoration. Therefore, indoor air formaldehyde pollution in newly installed houses is very common. According to GB 18580-2001, it stipulates in detail the standard level of formaldehyde emission from wood-based panels manufactured in my country. Taking the dryer method as an example, when the emission is reduced to: 1.5mg / L<absorption liquid formaldehyde concentration≤5.0 mg / L, then It belongs to E2 grade wood-based panels for outdoor use, and must be treated before it can be used indoors; when the concentration of formaldehyde in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/18
CPCB27N3/18
Inventor 张明昕
Owner 同威信达技术(江苏)股份有限公司