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Production method of damp-proof low-formaldehyde urea-formaldehyde resin adhesive

A low-formaldehyde urea-formaldehyde resin and urea-formaldehyde resin technology, which is used in adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc. , Excellent moisture-proof function, low formaldehyde residue effect

Active Publication Date: 2015-07-08
香河天亚木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor water resistance of wood-based panels made of various straws, nut shells and other raw materials, the panels warp and deform due to differences in expansion force after moisture absorption

Method used

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  • Production method of damp-proof low-formaldehyde urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The production of urea-formaldehyde resin comprises the steps:

[0024] Pre-polymerization stage: put the formaldehyde aqueous solution with a weight concentration of 37% into the reaction kettle, start the agitator, add formic acid to adjust the pH of the solution to 2-2.5 when the temperature is stable at 49-55°C, add the first batch of urea to react with formaldehyde, Make the molar ratio of formaldehyde and urea F / U =10; react at 55-60°C for 35 minutes;

[0025] Polymerization stage: after the reaction in the prepolymerization 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, and add the first batch of melamine. The amount of the first batch of melamine accounts for 10% of the total melamine weight. % ~ 30%, after stirring evenly, add the second batch of urea to make formaldehyde and urea F / U = 3, and react for 35 minutes;

[0026] Post-polymerization st...

Embodiment 2

[0028] Take 60 parts of the modified urea-formaldehyde resin obtained in Example 1, take 10 parts of OPE moisture-proof agent, stir and mix evenly, add 15 parts of calcium carbonate, grind with a three-roller mill for 30 minutes, and obtain a moisture-proof and low-formaldehyde urea-formaldehyde resin glue.

Embodiment 3

[0030] Take 65 parts of the modified urea-formaldehyde resin obtained in Example 1, take 11 parts of OPE moisture-proof agent, stir and mix evenly, add 16 parts of kaolin, grind with a three-roll mill for 30 minutes, and obtain a moisture-proof and low-aldehyde urea-formaldehyde resin glue.

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Abstract

The invention provides a damp-proof low-formaldehyde urea-formaldehyde resin adhesive which comprises the following raw materials in parts by weight: 60-80 parts of modified urea-formaldehyde resin, 10-14 parts of an OPE damp-proof agent and 15-20 parts of a filling material. A production method of the damp-proof low-formaldehyde urea-formaldehyde resin adhesive comprises the steps of preparing urea-formaldehyde resin, wherein the formaldehyde is fed once, and urea is fed three times, production of the urea-formaldehyde resin is carried out in three stages, namely pre-polymerization, polymerization and later polymerization, and a coupling agent can be added into the urea-formaldehyde resin in the later stage of polymerization to increase the degree of crosslinking; and adding the OPE damp-proof agent after later stage of polymerization, adding the filling material after the OPE damp-proof agent and the urea-formaldehyde resin are uniformly mixed and stirred, and grinding for 30min by a three-roll grinder to obtain the damp-proof low-formaldehyde urea-formaldehyde resin adhesive. The damp-proof low-formaldehyde urea-formaldehyde resin adhesive provided by the invention has excellent water resistance, good humidity resistance and a small amount of residual formaldehyde, and solves a problem in the shaving board and density board industry today.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin adhesive, in particular to a production method of a urea-formaldehyde resin adhesive with good moisture-proof performance and low aldehyde. Background technique [0002] With the rapid development of China's economy and the improvement of people's living standards, the requirements for home decoration are also constantly increasing. Because of its natural and beautiful texture and good texture, wooden floor has become the first choice material for home floor decoration. In order to save wood and protect forests, the state encourages the use of the three residues in forestry production, sawdust, shavings, bark, sanding powder, and branch materials produced in wood processing, bamboo processing, and wood-based panel production, as well as those produced after harvesting crops. All kinds of straw, nut shells, etc. are used as raw materials to produce wood-based panels. The wood-based panels produced fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C09J11/08C09J11/04C08G12/40
Inventor 马云周子茜周帆陈宏玲秦文雄
Owner 香河天亚木业有限公司
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