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Glycidyl ether modified urea formaldehyde resin and preparation method thereof

A technology of glycidyl ether and urea-formaldehyde resin, applied in aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve problems such as applications that have not been reported

Active Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, glycidyl ether is mainly used as a diluent and toughening agent for epoxy resins, but its application in urea-formaldehyde resin adhesives has not been reported.

Method used

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  • Glycidyl ether modified urea formaldehyde resin and preparation method thereof
  • Glycidyl ether modified urea formaldehyde resin and preparation method thereof
  • Glycidyl ether modified urea formaldehyde resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of urea-formaldehyde resin: In another 500ml four-necked bottle, open the reflux condensing device and the stirring device, add 170g of formaldehyde solution with a mass percentage of 37%, 70.00g of urea, 1.0g of modifier borax, and add aqueous sodium hydroxide solution to adjust the pH of the system = 8.5, start heating at the same time; when the temperature rises to 90°C, heat-preserve for 50 minutes; adjust the pH of the system to 5.0 with aqueous formic acid, add 10 g of ethylene glycol diglycidyl ether, and heat-react for 10 minutes at 90°C; add 30 parts by weight of urea, Insulate and react at 85°C for 20 minutes; adjust the pH value to 7.2 with aqueous sodium hydroxide solution, add 20 g of urea, and insulate and react at 70°C for half an hour; cool down to 40°C, add aqueous sodium hydroxide solution to adjust the pH value of the system to 8.0, cool and discharge , to obtain urea-formaldehyde resin. The total molar ratio of formaldehyde and urea in th...

Embodiment 2

[0022] In this embodiment, 30 g of ethylene glycol diglycidyl ether is added to modify the urea-formaldehyde resin during the preparation process, and the others are the same as in Example 1.

Embodiment 3

[0024] In this embodiment, 50 g of ethylene glycol diglycidyl ether is added to modify the urea-formaldehyde resin during the preparation process, and the others are the same as in Example 1.

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Abstract

The invention discloses a glycidyl ether modified urea formaldehyde resin and a preparation method thereof. The glycidyl ether modified urea formaldehyde resin is prepared from formaldehyde, urea, long-chain multifunctional glycidyl ether and a modifying agent according to the technological line of weak alkali-weak acid-weak alkali. According to the method, the long-chain multifunctional glycidylether is introduced as a crosslinking agent of the urea formaldehyde resin; a plurality of epoxy groups on the end group of glycidyl ether are used for enhancing the curing crosslinking degree of urea formaldehyde resin with a low aldehyde to urea (F / U) molar ratio; and meanwhile, a long chain is used for enhancing the flexibility of the resin and reducing internal stress generated in the curing process of the resin so as to enhance the cementing strength and the water resistance of the resin. The urea formaldehyde resin prepared by the method has the advantages of low content of free formaldehyde, simple technology and excellent cementing strength; meanwhile, the use period of the resin is prolonged greatly; the construction performance of an adhesive is improved; and the average value of the release amount of platy formaldehyde prepared by the adhesive is smaller than or equal to 0.3mg / L.

Description

technical field [0001] The invention relates to a glycidyl ether modified urea-formaldehyde resin and a preparation method thereof, which are mainly used in the wood-based panel processing industry. Background technique [0002] According to the information from the State Forestry Administration, my country's wood-based panel production reached 138.74 million cubic meters in 2010, an increase of 20.16% over 2009. It is the world's largest producer of wood-based panels and has also become the world's largest producer of wood adhesives, especially urea-formaldehyde resin adhesives. big country. In 2010, the total amount of adhesives used in my country's wood-based panel production was more than 10 million tons, of which urea-formaldehyde resin accounted for more than 80%, about 8 million tons. With the improvement of the economic level and the increasing awareness of environmental protection, Europe, the United States, and Japan have put forward stricter requirements on the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C09J161/32
Inventor 李效玉叶俊王海侨邱藤
Owner BEIJING UNIV OF CHEM TECH
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