Production method for catching agent lowering formaldehyde in wood board

A technology of capture agent and formaldehyde capture agent, which is applied in the jointing of wooden veneers, chemical instruments and methods, adhesives, etc., can solve the problems of unsatisfactory bond strength and high cost of adhesives, and achieve enhanced physical and mechanical properties , Guaranteed quality, easy biodegradable effect

Active Publication Date: 2015-07-22
贵港市港南区林海木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN201010244439.0 discloses a wood-based panel, which uses cyanoethylated fiber as the adhesive of the wood-based panel. Since

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example one

[0022] (1) Strong acid stage: Put 450 parts of 37% formaldehyde aqueous solution into the reactor, turn on the agitator, add a certain amount of formic acid to adjust the pH of the solution to 2~2.5 when the temperature is stable at 49~55℃, add the first A batch of 150 parts of urea reacts with formaldehyde so that the molar ratio of formaldehyde to urea is F / U = 10; react at 55-60°C for 35 minutes.

[0023] (2) Weak alkali stage: After the reaction in the strong acid stage, immediately adjust the pH of the reaction solution to 8.1-8.5 with aqueous sodium hydroxide solution, raise the temperature to 81-85°C, add 5 parts of the first batch of melamine, and the first batch of melamine accounts for 10% of the total melamine weight; after stirring, add 270 parts of the second batch of urea to make the molar ratio of formaldehyde to urea F / U = 5, and react for 35 minutes.

[0024] (3) Weak acid stage: After the reaction in the weak base stage, adjust the pH to 4...

Example Embodiment

[0028] Example two

[0029] (1) Strong acid stage: Put 470 parts of 37% formaldehyde aqueous solution into the reactor, turn on the agitator, add a certain amount of formic acid to adjust the pH of the solution to 2~2.5 when the temperature is stable at 49~55℃. A batch of 141 parts of urea was reacted with formaldehyde so that the molar ratio of formaldehyde to urea was F / U = 10; the reaction was conducted at 55-60°C for 35 minutes.

[0030] (2) Weak alkali stage: After the reaction in the strong acid stage, immediately adjust the pH of the reaction solution to 8.1-8.5 with sodium hydroxide aqueous solution, and raise the temperature to 81-85°C. Add 16 parts of the first batch of melamine. 30% of the total melamine weight; after stirring, add 282 parts of the second batch of urea to make the molar ratio of formaldehyde to urea F / U = 5, and react for 35 minutes.

[0031] (3) Weak acid stage: After the reaction in the weak base stage, adjust the pH to 4.2-4.4 with formic ac...

Example Embodiment

[0035] Example three

[0036] (1) Strong acid stage: Put 500 parts of formaldehyde solution with 37% weight concentration into the reactor, turn on the agitator, add a certain amount of formic acid when the temperature is stable at 49-55℃ to adjust the pH of the solution to 2~2.5, add the first A batch of 150 parts of urea is reacted with formaldehyde so that the molar ratio of formaldehyde to urea is F / U = 10; react at 55-60°C for 35 minutes.

[0037] (2) Weak base stage: After the strong acid stage, the pH of the reaction solution is adjusted to 8.1~8.5 with sodium hydroxide aqueous solution, and the temperature is raised to 81~85℃. 30 parts of the first batch of melamine are added. 50% of the total melamine weight; after stirring evenly, add 300 parts of the second batch of urea to make the molar ratio of formaldehyde to urea F / U = 5, and react for 35 minutes.

[0038] (3) Weak acid stage: After the reaction in the weak base stage, adjust the pH to 4.2-4.4 with formic acid....

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PUM

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Abstract

The invention discloses a production method for a catching agent lowering formaldehyde in a wood board. The catching agent comprises, by weight, the following raw materials of 450 to 500 parts of formaldehyde aqueous solution with 37 percents of weight concentration, 430 to 500 parts of carbamide, 50 to 60 parts of melamine, 160 to 180 parts of flour, 13 to 15 parts of ammonium chloride and 88 to 100 parts of volatile oil formaldehyde catching agent. The volatile oil formaldehyde catching agent is one kind of volatile oils extracted from maple leaves, cryptomeria fortunei leaves, pine leaves and Japan cypress leaves or a mixture of any two kinds of the volatile oils. The producing steps of the catching agent lowering formaldehyde in the wood board are a strong acid stage, a weak base stage, a weak acid stage, a glue solution modulating stage, a board producing technology stage and performance test in sequence. The key of the production method for the catching agent lowering formaldehyde in the wood board is that through an original structure of modified urea resin, the formaldehyde emission is reduced, the volatile oil formaldehyde catching agent and modified urea-formaldehyde resin adhesive are added in the producing process of the board, free formaldehyde in the producing process is absorbed, and the formaldehyde emission is further reduced. The produced board through the production method for the catching agent lowering formaldehyde in the wood board has the advantages that the formaldehyde emission is slow, the adhesiveness is good, and the production cost is low.

Description

technical field [0001] The invention relates to a production method of a trapping agent for reducing formaldehyde on a wood board, in particular to a method for reducing the release of formaldehyde from a wood board by an essential oil trapping agent. Background technique [0002] Now, people are increasingly using wood-based panels to replace natural wood panels, such as plywood, five-plyboard, particleboard, fiberboard, etc. It not only saves resources but also reduces the cost of wood panels. At present, the wood-based panel adhesive is mainly urea-formaldehyde resin or modified urea-formaldehyde resin. However, there are many problems in the quality of urea-formaldehyde resin products. The most important defect is the release of formaldehyde during use, and the product may also continuously release formaldehyde during use. Formaldehyde has a stimulating effect on the nasal mucosa, retina, respiratory tract and liver of the human body. -3 Working and living in an envi...

Claims

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Application Information

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IPC IPC(8): B27D1/08B32B37/12B32B37/06B32B37/10C08G12/38C09J161/30C09J103/02C09J11/06
CPCB27D1/08B32B37/06B32B37/10B32B37/12C08G12/38C09J11/06C09J103/02C09J161/30
Inventor 马广马云马珍陈宏玲廖迪峰
Owner 贵港市港南区林海木业有限公司
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