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A method for removing formaldehyde in wood-based panels using microwave

A wood-based panel and formaldehyde technology, applied in the application, household components, household appliances and other directions, can solve the problems of wood-based panel deformation, unfavorable installation and use of wood-based panels, etc., to accelerate the release of formaldehyde, avoid deformation, and improve production efficiency.

Inactive Publication Date: 2018-06-29
上海戊丰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for removing formaldehyde from wood-based panels by using microwaves, which solves the need to inject water into the wood-based panels when using microwaves to remove formaldehyde from wood-based panels, which will cause deformation of the wood-based panels, which is not conducive to Subsequent installation and use of wood-based panels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for removing formaldehyde in wood-based panels using microwaves, comprising the following steps:

[0031] (1) Raw material pretreatment: dry the raw material shavings of wood-based panels to reduce the moisture content to 3%;

[0032] (2) Binder preparation: Mix 20 parts of water, 60 parts of urea-formaldehyde resin, 6 parts of ammonium chloride, and 3 parts of four-needle zinc oxide to form a binder;

[0033] (3) Mixing and stirring: Take 100 parts of shavings and 18 parts of binder, put them into the mixer, and stir until the shavings and binder are fully and evenly mixed;

[0034] (4) Pavement calendering: the stirred material is sent into the calender, and then rolled and calendered 3 times through the calender at a temperature of 70°C and a pre-compression unit pressure of 1.8MPa to obtain a slab with a smooth surface;

[0035] (5) Hot pressing curing: Send the slab into a continuous rolling hot pressing machine. Under the conditions of hot pressing tempe...

Embodiment 2

[0038] A method for removing formaldehyde in wood-based panels using microwaves, comprising the following steps:

[0039] (1) Raw material pretreatment: dry the raw material shavings of wood-based panels to reduce the moisture content to 4%;

[0040] (2) Binder preparation: Mix 25 parts of water, 65 parts of urea-formaldehyde resin, 7 parts of ammonium chloride, and 5 parts of four-needle zinc oxide to form a binder;

[0041] (3) Mixing and stirring: Take 100 parts of shavings and 19 parts of binder, put them into a mixer, and stir until the shavings and binder are fully and evenly mixed;

[0042] (4) Paving and calendering: the stirred material is sent into the calender, and then rolled and calendered 4 times through the calender at a temperature of 75°C and a pre-compression unit pressure of 1.8MPa to obtain a slab with a smooth surface;

[0043] (5) Hot pressing and curing: Send the slab into a continuous rolling hot pressing machine. Under the condition of hot pressing te...

Embodiment 3

[0046] A method for removing formaldehyde in wood-based panels using microwaves, comprising the following steps:

[0047](1) Raw material pretreatment: dry the raw material shavings of wood-based panels to reduce the moisture content to 4%;

[0048] (2) Binder preparation: mix 30 parts of water, 70 parts of urea-formaldehyde resin, 7 parts of ammonium chloride, and 10 parts of four-needle zinc oxide, and prepare a binder;

[0049] (3) Mixing and stirring: Take 100 parts of shavings and 20 parts of binder, put them into the mixer, and stir until the shavings and binder are fully and evenly mixed;

[0050] (4) Pavement calendering: the stirred material is sent into the calender, and then rolled and calendered 5 times through the calender at a temperature of 80°C and a pre-compression unit pressure of 1.8MPa to obtain a slab with a smooth surface;

[0051] (5) Hot pressing and curing: Send the slab into a continuous rolling hot pressing machine. Under the conditions of hot press...

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Abstract

The invention discloses a method for removing formaldehyde in an artificial board through microwaves, and belongs to the field of formaldehyde removing artificial boards. The method comprises the first step of raw material pretreatment, the second step of bonding agent preparing, the third step of mixture stirring, the fourth step of paving calendering, the fifth step of hot press curing and the sixth step of microwave formaldehyde removing. Microwave absorbing and heat emitting powder is added in a bonding agent and has the effects of wave absorbing and heat emitting, in the microwave artificial board treatment process, the inner temperature and the outer temperature of the artificial board can be rapidly increased at the same time through the microwave absorbing and heat emitting powder, formaldehyde release is accelerated, and deformation of the artificial board is avoided. Relative to water injection, the microwave absorbing and heat emitting powder has the beneficial effects of energy saving and high efficiency, and the production efficiency is improved; the microwave absorbing and heat emitting powder is added in the bonding agent preparing process, the traditional panel production technology is hardly influenced, and the method is suitable for large-range popularization.

Description

technical field [0001] The invention relates to a method for removing formaldehyde in wood-based panels by using microwaves, and belongs to the field of formaldehyde-removing wood-based panels. Background technique [0002] Wood-based panels mainly include three categories of products: plywood, particle (chip) board and fiberboard. At present, urea-formaldehyde resin adhesives are widely used in the wood-based panel industry to bond and form various panels and products. Urea-formaldehyde resin adhesive is compounded by urea and formaldehyde, which has low cost, easy preparation, simple production and convenient use. However, under certain conditions, especially when the ambient temperature is high, this type of adhesive tends to release formaldehyde continuously and becomes an important source of indoor formaldehyde. Studies have shown that if the concentration of formaldehyde in the air reaches 0.45mg / m³, respiratory diseases will increase, if it is 1mg / m³, it will cause t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/00B27N3/08B27N3/14B27N1/02B27N1/00B27N3/18C08L97/02C08L61/24C08K3/28C08K7/08
CPCB27K5/0055B27N1/003B27N1/02B27N3/08B27N3/14B27N3/18C08L97/02C08L61/24C08K3/28C08K7/08Y02P20/10
Inventor 曹登华马浩
Owner 上海戊丰环保科技有限公司
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