Modified urea-formaldehyde resin adhesive and preparation technology thereof

A urea-formaldehyde resin and adhesive technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of increased gas generation, poor heat resistance of resins, decreased strength, etc., and achieve prolonged activity. effect of improving heat resistance and stability

Inactive Publication Date: 2014-01-22
林贤文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general furfuryl alcohol modified urea-formaldehyde resin, due to the relatively low content of furfural and urea-formaldehyde, the heat resistance of the resin is poor, the strength decreases at high temperature, and the gas generation increases, and the casting is prone to produce pores, so it is only suitable for pouring small cast steel. and castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Urea 20-30

[0021] Formaldehyde (37%) 70-80

[0022] Nitric acid 1.5-2.5

[0023] Calcium hydroxide (15%-30%) 0.5-1

[0024] Sodium bicarbonate 2.5-3.5

[0025] Furfuryl alcohol 25-30

[0026] Appropriate amount of water.

[0027] Add formaldehyde and sodium bicarbonate aqueous solution in the stirred tank, after stirring evenly, add calcium hydroxide solution, adjust reactant pH value to be 7-8;

[0028] Add urea and nitric acid, raise the reaction temperature to 90-95°C, and react for about 1 hour. The urea first undergoes an addition reaction with formaldehyde, and then further undergoes a polycondensation reaction to form a resin;

[0029] Take 15 parts of the above-prepared resin and 85 parts of furfuryl alcohol, put the two liquids into another reaction kettle, stir well, adjust the pH value to 5-6 with nitric acid, and cool down to 70°C after reacting for 1 hour;

[0030] Connect the vacuum system, close the reflux condenser, and contro...

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PUM

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Abstract

The embodiment of the invention discloses a modified urea-formaldehyde resin adhesive. The modified urea-formaldehyde resin adhesive comprises the following components in mass ratio: urea, formaldehyde, nitric acid, calcium hydroxide, sodium bicarbonate, furfural alcohol and water. The using amount of the furfural alcohol is increased in a resin preparation process, so that furan rings in resin molecules are increased, thus the heat resistance and stability of the resin are improved; in addition, the activity period of the urea-formaldehyde resin can be prolonged by adding a small number of calcium hydroxide.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a modified urea-formaldehyde resin adhesive and a manufacturing process thereof. Background technique [0002] Urea-formaldehyde resin adhesive is an earlier developed thermosetting polymer adhesive. Because of its simple process, cheap raw materials, high bonding strength, colorless and transparent, etc., it is widely used in the production of plywood, particle board, medium density fiberboard, artificial board and interior decoration and other industries. The urea-formaldehyde resin modified by furfuryl alcohol is widely used as a foundry adhesive in foundry sand molds due to its advantages of high strength, low brittleness and fast hardening speed. The general furfuryl alcohol modified urea-formaldehyde resin, due to the relatively low content of furfural and urea-formaldehyde, the heat resistance of the resin is poor, the strength decreases at high temperature, and the gas gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C09J11/04C08G12/40
Inventor 林贤文
Owner 林贤文
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