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Urea-formaldehyde resin adhesive and preparation method thereof

A technology of adhesives and urea-formaldehyde resins, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor water resistance and hot water resistance, and achieve no environmental pollution and low cost , the effect of high yield

Inactive Publication Date: 2013-07-10
安徽肯帝亚皖华人造板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because urea-formaldehyde glue has rich sources of raw materials and low cost, but it also has poor water resistance, especially poor water resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The urea-formaldehyde resin adhesive is composed of raw materials in parts by weight: 6.15kg of formaldehyde, 4.05kg of urea, 125g of melamine, 100g of high-efficiency composite additives, 500g of water, 30g of ammonia water and 6g of formic acid.

[0015] The preparation method of urea-formaldehyde resin adhesive, comprises the following steps:

[0016] (1) Heat the metered formaldehyde to 28-32°C and turn off the gas, adjust the pH value to 8.5-8.8, add 2.2kg urea and 75g melamine, measure the pH value and adjust it to 8.3-8.5, start heating for 30-40 minutes, When the temperature rises to 38-42°C, add ammonia water, heat up to 70-83°C, turn off the gas, keep warm for 20 minutes, control the temperature at 88-92°C, add an aqueous solution of high-efficiency compound additives, and keep warm for 10 minutes;

[0017] (2) Slowly add formic acid in fractions of 10-15 minutes, adjust PH = 5.5-5.6, add the remaining 50g of melamine, polycondense at 90-93°C for ...

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PUM

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Abstract

The invention discloses urea-formaldehyde resin adhesive and a preparation method thereof. The preparation method mainly comprises the following steps: reacting formaldehyde, urea, tripolycyanamide, an efficient composite auxiliary agent, water, ammonia and formic acid in certain parts by weight, wherein the urea is added by three times, the tripolycyanamide is added by two times, and during the reaction, pH is adjusted by using formic acid and caustic soda liquid; and pouring out adhesive to obtain a finished product. The preparation method is simple, low in cost, and free of environment pollution; the prepared urea-formaldehyde resin adhesive is water-resistant, heat-resistant and corrosion-resistant; and the preparation method is high in yield and applicable to large-scale production.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin adhesive and a preparation method thereof, belonging to the technical field of chemical production. Background technique [0002] Urea-formaldehyde resin is one of the most widely used and most demanded adhesives in the bamboo and wood industry. It is not only used in the production of glued laminated boards, wood-based panels (fiberboard and particleboard), but also in the processing of bamboo mat boards, bamboo chipboards, etc. in recent years. This is because urea-formaldehyde glue has rich sources of raw materials and low cost, but it also has poor water resistance, especially poor hot water resistance. Contents of the invention [0003] In order to alleviate the deficiencies and defects of the prior art, the object of the present invention is to provide a urea-formaldehyde resin adhesive and a preparation method thereof. The preparation method of the present invention is simple, with low cost ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/30C08G12/38
Inventor 张惠敏李晓艳王威王军陈建祥
Owner 安徽肯帝亚皖华人造板有限公司