Glycidyl ether modified urea formaldehyde resin and preparation method thereof

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...

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.

Images