Method for producing phenolic resin adhesive
The technology of a phenolic resin and a production method is applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., which can solve the problems of cumbersome processes, reduction of large-scale production, unfavorable production costs and the like, and achieves a simple process. , the effect of low cost
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Examples
Embodiment 1
[0017] 1) mixing phenol with wood tar to obtain wood tar-containing phenol, and the mass percentage of wood tar in the wood tar-containing phenol is 10%;
[0018] 2) phenol containing wood tar, formaldehyde and catalyst (5% NaOH aqueous solution) are prepared according to the molar ratio of 1: 1: 0.05;
[0019] 3) Add wood tar-containing phenol and catalyst into the reaction kettle, heat at 35°C for 15 minutes, then raise the temperature to 55°C, and start to add formaldehyde dropwise, and control the drop rate of formaldehyde to complete the dropwise addition within half an hour and maintain the dropping period The temperature of the reaction system is 65°C. After the dropwise addition, heat at 80°C for 2 hours, then add distilled water to adjust the viscosity of the reaction product to 25mpa.s, filter to remove coarse impurities, and finally dehydrate under vacuum at 20°C and 0.098Mpa to obtain Phenolic resin adhesive.
[0020] The solid content of the phenolic resin adhesi...
Embodiment 2
[0022] 1) Heating and distilling wood tar, collecting fractions at 150-250°C, mixing the wood tar fraction with phenol to obtain wood tar-containing phenol, the mass percentage of wood tar fraction in the wood tar-containing phenol is 15%;
[0023] 2) phenol containing wood tar, formaldehyde and catalyst (30% KOH aqueous solution) are prepared according to the molar ratio of 1: 2: 0.3;
[0024] 3) Add wood tar-containing phenol and catalyst into the reaction kettle, heat at 45°C for 20 minutes, then raise the temperature to 65°C, and start to add formaldehyde dropwise, and control the drop rate of formaldehyde to complete the dropwise addition within half an hour and maintain the dropping period The temperature of the reaction system is 70°C. After the dropwise addition, heat at 90°C for 1.5 hours, then add distilled water to adjust the viscosity of the reaction product to 50mpa.s, filter to remove coarse impurities, and finally dehydrate under vacuum at 35°C and 0.09Mpa to obt...
Embodiment 3
[0027] 1) phenol, formaldehyde and catalyst (45% NaOH aqueous solution) are prepared according to the molar ratio of 1: 3: 0.5;
[0028] 2) Add phenol and catalyst to the reaction kettle, heat at 50°C for 30 minutes, then raise the temperature to 70°C, and start adding formaldehyde dropwise, control the drop rate of formaldehyde to complete the dropwise addition within half an hour and maintain the temperature of the reaction system during the dropwise addition After the dropwise addition, heat at 100°C for 1 hour, then add distilled water to adjust the viscosity of the reaction product to 100mpa.s, filter to remove coarse impurities, and finally vacuum dehydrate at 50°C and 0.08Mpa to obtain a phenolic resin adhesive.
[0029] The solid content of the phenolic resin adhesive prepared in Example 3 is 85.0-95.0%, free phenol is less than 5%, free aldehyde is less than 0.1%, pH value is 11-12, viscosity is 6000-9000mPa.s, bonding strength is greater than 1.75MPa, 150°C Under the...
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