Nano material modified multifunctional urea resin composite material and preparation method thereof

Abstract

The invention provides a nano material modified multifunctional urea resin composite material and a preparation method thereof. The composite material is prepared from nano chitosan modified urea resin, urea resin microcapsule and nano silicon dioxide. The specific preparation method comprises the steps of adding the urea resin into methyl alcohol, adding sodium borohydride, performing low-temperature reaction to obtain hydroxyl modified urea resin, then mixing with a nano chitosan solution, dropwise adding sodium hydroxide and performing heating reaction to obtain the nano chitosan modified urea resin; degrading cellulose by a cellulase solution, ultrasonically breaking to obtain micro-nano cellulose, adding manganese dioxide, stirring under room temperature, then adding into a urea resin water solution and evenly stirring to obtain the urea resin microcapsule; mixing the two materials, adding the nano silicon dioxide and evenly mixing to obtain the nano material modified multifunctional urea resin composite material. The prepared urea resin composite material disclosed by the invention has good mechanical property, good water and heat resistance, low free formaldehyde, environmental friendliness and high energy.

Description

technical field [0001] The invention belongs to the technical field of urea-formaldehyde resin composite materials, and in particular relates to a nano-material modified multifunctional urea-formaldehyde resin composite material and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin, also known as UF resin, is formed by methylolation and polycondensation of urea and formaldehyde under the action of an alkaline or acidic catalyst to form an initial hydrophilic urea-formaldehyde resin, and then under the action of a curing agent or an auxiliary agent to form an insoluble resin. , Infusible final resin. Urea-formaldehyde resin has many advantages such as high bonding strength, fast curing, colorless cured adhesive layer, simple manufacture, good operability, low cost, rich source of raw materials and excellent comprehensive performance, and the preparation process tends to be mature, and most of them use weak base-weak acid — Weak alkali proces...

AI Technical Summary

Problems solved by technology

[0003] However, compared with other rubber types, urea-formaldehyde resin has disadvantages such as poor water resistance, high brittleness of the adhesive layer after curing, poor aging resistance and high content of free formaldehyde. Currently, phenol, melamine, resorcinol, aniline, furfural, flour, soybean Powder and bentonite and other raw materials are used to modify urea-formaldehyde resin to improve the performance of urea-formaldehyde resin. However, the functional performance of urea-formaldehyde resin adhesive is still poor, and it is still a low-value product. The market competitiveness is poor and it is easy to be replaced by the market.