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Glyoxal modified urea-melamine-formaldehyde resin adhesive and preparation method thereof

A technology of melamine and modified urea is applied in the field of urea melamine formaldehyde resin glue production, which can solve the problems of high gluing strength, limited gluing range, poor gluing performance, etc., and achieve the effect of wide gluing range

Inactive Publication Date: 2015-12-09
宋建平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure urea-formaldehyde resin glue is hardly used at present. The reason is that the environmental protection requirements for products are relatively high. Products produced with low molar ratio urea-formaldehyde resin glue have better environmental protection performance, but the strength of the product is poor. Use a slightly higher molar ratio. The strength of the products produced by the urea-formaldehyde resin glue is good, but the environmental protection performance of the products is not up to the standard
Therefore, strictly speaking, the largest amount of glue used in the wood industry is urea melamine formaldehyde resin glue; however, it also has shortcomings, its environmental performance is not very ideal, the glue layer is brittle, and the glue strength when gluing wood raw materials Larger, the gluing performance is poor when gluing other materials, so its gluing range is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: the preparation method of glyoxal modified urea melamine formaldehyde resin glue:

[0010] Weigh each component according to the weight of the following components (weight unit: gram or kilogram): 200 grams of urea, 400 grams of industrial formaldehyde with a weight concentration of 37%, 40 grams of glyoxal, and 40 grams of water. Add 400 grams of quantitative formaldehyde and 40 grams of glyoxal into the reaction bottle, adjust it to alkaline with a caustic soda solution with a weight concentration of 20%, add 150 grams of urea, and control the temperature to 90°C within 0.5 hours, so that it is at 90°C React at high temperature for 0.5 hours, then adjust to weak acidity with formic acid with a weight concentration of 40%, react to a certain viscosity at a temperature of 90°C, adjust to weak alkalinity with a 20% weight concentration of caustic soda solution, add the remaining urea, After stirring for 10 minutes, after vacuum dehydration for 0.5 hours, ad...

Embodiment 2

[0012] Embodiment 2: the preparation method of glyoxal modified urea melamine formaldehyde resin glue:

[0013] Take each component according to the weight of the following components (weight unit gram or kilogram): 226.8 grams of urea, 300 grams of industrial formaldehyde with a weight concentration of 37%, and 60 grams of glyoxal. Add 300 grams of quantitative formaldehyde and 60 grams of glyoxal into the reaction bottle, adjust it to alkaline with a caustic soda solution with a weight concentration of 20%, add 113.4 grams of urea, control the temperature to 90°C within 0.5 hours, and make it at 90°C React at high temperature for 0.5 hours, then use formic acid with a weight concentration of 40% to adjust to weak acidity, react at a temperature of 90°C to a certain viscosity, and then adjust the pH to 6.0-6.5 with a weight concentration of 20% caustic soda solution, add urea 55 grams, react for 10 minutes, then adjust the pH to 8.0-8.5 with a caustic soda solution with a wei...

Embodiment 3

[0015] Embodiment 3: the preparation method of glyoxal modified urea melamine formaldehyde resin glue:

[0016] Weigh each component according to the weight of the following components (weight unit gram or kilogram): 5.0 grams of urea, 371.9 grams of industrial formaldehyde with a weight concentration of 37%, 317.9 grams of melamine, 55.0 grams of glyoxal, 60.6 grams of ethanol, and 100.0 grams of water. Add 371.9 grams of quantitative formaldehyde and 55.0 grams of glyoxal into the reaction flask, adjust it to alkaline with a caustic soda solution with a weight concentration of 20%, add 5.0 grams of urea, and control the temperature of 317.9 grams of melamine to 85 ° C within 0.5 hours to make it React to a certain viscosity at a temperature of 85°C, then adjust the pH to 9.0-9.5 with a caustic soda solution with a weight concentration of 20%, after cooling to 75°C, add 100.0 grams of water and 60.6 grams of ethanol, stir for 10 minutes, and cool to 40 The discharge below ℃ i...

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PUM

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Abstract

The invention relates to a glyoxal modified urea-melamine-formaldehyde resin adhesive and a preparation method thereof. The resin adhesive comprises 0.55-38.6wt% of urea, 0-34.9wt% of melamine, 40-62.4wt% of industrial formaldehyde with the weight concentration of 37%, 5.9-10.2wt% of glyoxal, a proper amount of formic acid with the weight concentration of 40%, a proper amount of a caustic soda solution with the weight concentration of 20%, and the balance of a solvent. The preparation method comprises the following steps: 1, adding certain amounts of formaldehyde and glyoxal into a reaction container (a flask with three necks, or a reaction pot); 2, starting a stirrer, and adjusting the caustic soda solution with the weight concentration of 20% to be alkaline; and 3, heating to a certain temperature (85-90DEG C), reacting for a certain time (0.5-1h), adjusting the obtained solution to be neutral or acidic, reacting to a certain viscosity, neutralizing by using the caustic soda solution with the weight concentration of 20% to be neutral or weak alkaline, cooling to 40DEG C or below, and discharging. The glyoxal modified urea-melamine-formaldehyde resin adhesive has the advantages of large bonding strength, wide bonding range, extremely low content of free formaldehyde in the adhesive, and good environmental protection performance, and can substitute present traditional urea-melamine-formaldehyde resin adhesives.

Description

technical field [0001] The invention relates to a urea-melamine-formaldehyde resin glue modified with glyoxal and a preparation method thereof, belonging to the technical field of urea-melamine-formaldehyde resin glue production. Background technique [0002] Urea melamine formaldehyde resin glue is a wood adhesive with excellent properties. The boards made of it have high bonding strength, and its water resistance and heat resistance are better than urea-formaldehyde resin glue. It is the most commonly used glue in the wood industry. Particleboard, plywood, medium density It is used in the production process of wood-based panels such as fiberboard, high-density fiberboard, and blockboard. Pure urea-formaldehyde resin glue is hardly used at present. The reason is that the environmental protection requirements for products are relatively high. Products produced with low molar ratio urea-formaldehyde resin glue have better environmental protection performance, but the strength...

Claims

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Application Information

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IPC IPC(8): C08G12/38C08G12/40
Inventor 于红卫刘启明宋建平
Owner 宋建平