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Free formaldehyde trapping agent and process for preparing same

A technology of free formaldehyde and production methods, applied in the direction of coating, etc., can solve the problems of increased production costs, deep color bending, and affecting the stability of urea glue, etc.

Inactive Publication Date: 2006-09-06
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

CN9312141.9 discloses Mr. Liu Dingzhi's "free formaldehyde capture agent and its production process" patented technology, using urea, soybean powder, blood meal, animal glue, phenolic resin, etc. as raw materials to produce urea mold in copolymer blending, adding emulsified Formaldehyde can be formed into microcapsules, which also has obvious effect on the removal of formaldehyde, but soybean flour, blood meal, and animal glue are prone to mildew, resulting in changes in color and smell. The addition of phenolic resin will affect the stability of urea glue and make the color deep. Production costs have also increased

Method used

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  • Free formaldehyde trapping agent and process for preparing same

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[0008] The present invention will be described in further detail below in conjunction with the examples: in the raw materials, phosphoric acid and urea are all used industrially pure, and their ideal mol ratio is 1: 1.05, and catalyst uses ethylenediaminetetraacetic acid, disodium edetate, At least one kind of tetrasodium edetate, the added amount is 0.05-0.15% of the sum of phosphoric acid and urea added. Raw materials and parts by weight thereof are listed six kinds of embodiments such as the following table 1 (wherein ethylenediaminetetraacetic acid is represented by EDTA) for ease of operation:

[0009]

[0010] Referring to the 6 kinds of embodiments listed in the table above, now illustrate with embodiment 1: earlier, 90 parts by weight (hereinafter referred to as parts) of phosphoric acid and 55 parts of urea are added to the reactor, stirred, and EDTA and 55 parts of water are added, heated to 120- Keep warm at 130°C. When the pH of the reaction solution is 6.0-6.5,...

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Abstract

A method for production of free formaldehyde catching agent is characterized in that it consists of the following raw materials and parts by weight: 90-110 parts of phosphorus acid, 55-75 parts of carbamide, 55-75 parts of water and 0.05-0.15 parts of catalyst; its process flow comprises first adding the total phosphorus acid and the total carbamide prepared into the autoclave, stirring, then adding the catalyst and water of the same parts by weight as the carbamide simultaneously, heating to 120-130 DEG C, preserving heat, when PH arrives at 6.0-6.5, naturally cooling to less than 40 DEG C, then obtaining the target product by adjusting PH to 7.0-7.5 with ammonia. The catching agent obtained by this method can be widely used in production that needs urea formaldehyde condensate glue such as timber industry, and it is excellent in that its raw materials are easy to get, its process is simple, its cost is low and its elimination factor for aldehyde is high.

Description

technical field [0001] The invention belongs to a production method of a free formaldehyde scavenger of urea-formaldehyde resin used for bonding bamboo, wood and paper products. Background technique [0002] Urea-formaldehyde resin is widely used in the wood industry, and is popular for its cheap price, high bonding strength, simple production process, and low cost. Formaldehyde will be released during aging, which is in a free state, which seriously pollutes the environment and endangers human health. Countries around the world have carried out extensive and in-depth research on reducing the content of free formaldehyde and removing free formaldehyde. CN9312141.9 discloses Mr. Liu Dingzhi's "free formaldehyde capture agent and its production process" patented technology, using urea, soybean powder, blood meal, animal glue, phenolic resin, etc. as raw materials to produce urea mold in copolymer blending, adding emulsified Formaldehyde can be formed into microcapsules, whic...

Claims

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Application Information

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IPC IPC(8): C09D7/12
Inventor 于红卫
Owner ZHEJIANG FORESTRY UNIVERSITY
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