Glycidyl ether modified urea formaldehyde resin and preparation method thereof
A technology of glycidyl ether and urea-formaldehyde resin, applied in aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve problems such as applications that have not been reported
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Embodiment 1
[0019] Preparation of urea-formaldehyde resin: In another 500ml four-necked bottle, open the reflux condensing device and the stirring device, add 170g of formaldehyde solution with a mass percentage of 37%, 70.00g of urea, 1.0g of modifier borax, and add aqueous sodium hydroxide solution to adjust the pH of the system = 8.5, start heating at the same time; when the temperature rises to 90°C, heat-preserve for 50 minutes; adjust the pH of the system to 5.0 with aqueous formic acid, add 10 g of ethylene glycol diglycidyl ether, and heat-react for 10 minutes at 90°C; add 30 parts by weight of urea, Insulate and react at 85°C for 20 minutes; adjust the pH value to 7.2 with aqueous sodium hydroxide solution, add 20 g of urea, and insulate and react at 70°C for half an hour; cool down to 40°C, add aqueous sodium hydroxide solution to adjust the pH value of the system to 8.0, cool and discharge , to obtain urea-formaldehyde resin. The total molar ratio of formaldehyde and urea in th...
Embodiment 2
[0022] In this embodiment, 30 g of ethylene glycol diglycidyl ether is added to modify the urea-formaldehyde resin during the preparation process, and the others are the same as in Example 1.
Embodiment 3
[0024] In this embodiment, 50 g of ethylene glycol diglycidyl ether is added to modify the urea-formaldehyde resin during the preparation process, and the others are the same as in Example 1.
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