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Low-toxicity urea-formaldehyde resin for EO grade adhesive-bonded panel and preparation method and application thereof

A urea-formaldehyde resin, plywood technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problem of decreased bonding strength, poor storage stability of low-molar ratio urea-formaldehyde resins, and pre-compression of urea-formaldehyde resin adhesives Long time and other problems, to achieve the effect of low cost, low free formaldehyde content and low cost

Inactive Publication Date: 2007-12-05
NORTHEAST FORESTRY UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor storage stability of existing low molar ratio urea-formaldehyde resin and long pre-pressing time of urea-formaldehyde resin adhesive, and the problem of decreased bonding strength; and provide a kind of low-toxicity urea-formaldehyde resin for E0 grade plywood and its preparation method and application

Method used

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specific Embodiment approach 1

[0009] Specific embodiment one: the low-toxic urea-formaldehyde resin (abbreviated as UF) for the E0 grade plywood of the present invention is made of formaldehyde (37% industrial grade can be selected), urea (98% purity can be selected), polyvinyl alcohol, reinforcing agent, The basic catalyst and the acid catalyst are prepared according to the following ratio: formaldehyde: 100 parts by weight, polyvinyl alcohol: 1-1.5 parts by weight, reinforcing agent: 3.75-6 parts by weight, basic catalyst: 2000-2500ml, acid catalyst: 600-800ml, the molar ratio of formaldehyde to urea and the enhancer is 0.97-0.98:1; the enhancer is melamine, the basic catalyst is sodium hydroxide with a concentration of 30% by mass, and the acidic catalyst is 30% by mass 40% formic acid.

specific Embodiment approach 2

[0010] Embodiment 2: In this embodiment, the ratio of the sum of the moles of formaldehyde, urea and enhancer is 0.972-0.978:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: In this embodiment, the ratio of the sum of the moles of formaldehyde, urea and enhancer is 0.975:1. Others are the same as in the first embodiment.

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Abstract

The present invention relates to urea-formaldehyde resin, and is especially low toxicity urea-formaldehyde resin for E0 level veneer and its preparation process and application. The low toxicity urea-formaldehyde resin is prepared with formaldehyde 100 weight portions, PVA 1-1.5 weight portions, reinforcer 3.75-6 weight portions, alkaline catalyst 2000-2500 ml and acid catalyst 600-800 ml, and through reaction while controlling the molar ratio of the material, pH value and reaction temperature. It is applied as adhesive for veneer. The low toxicity urea-formaldehyde resin has the advantages of low free formaldehyde content, low cost, long storage life, high pre-pressing performance and high adhering strength; and the preparation process is simple and low in cost.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin and its preparation method and application, in particular to a low-toxicity urea-formaldehyde resin for E0 grade plywood and its preparation method and application. Background technique [0002] my country's wood-based panel production has exceeded 60 million m 3 , becoming the world's largest producer of wood-based panels. The development of the wood-based panel industry is inseparable from adhesives, with an annual production of 10,000 m 3 Plywood requires 1,000 tons of adhesive. Urea-formaldehyde resin adhesives are widely used in the wood-based panel industry due to a series of advantages such as low cost, abundant raw material sources, colorless cured adhesive layer, good operability, and good bonding performance. It is also the most widely used synthetic resin adhesive in the wood processing industry, accounting for more than 80% of the industry's adhesive usage. However, the free formaldehyd...

Claims

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Application Information

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IPC IPC(8): C08G12/36C09J161/24
Inventor 顾继友朱丽滨
Owner NORTHEAST FORESTRY UNIVERSITY
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