Preparation method of cardanol modified alkylresorcinol-formaldehyde resin
A technology of alkyl resorcinol formaldehyde resin and resorcinol, which is applied in the field of preparation of cardanol-modified alkyl resorcinol formaldehyde resin, and can solve problems such as easy to smoke, expensive, and pollute the air environment , to achieve the effect of reduced product cost, good flexibility and better compatibility
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Embodiment 1
[0021] According to resorcinol, cardanol, formaldehyde solution, styrene, and p-toluenesulfonol, the raw materials are weighed according to the following weight ratio: resorcinol: cardanol: formaldehyde solution: styrene: p-toluenesulfonol is 50:25 :25:30:0.5;
[0022] Put resorcinol, cardanol, and p-toluenesulfonol into the reactor by weight and mix them evenly. When the temperature rises to 120-130°C, start to add styrene dropwise, and finish dropping in 25-35 minutes. After dropping, maintain 1.5 Hours, drop formaldehyde solution when the temperature drops to 90-110°C, drop it in 55-65 minutes, then react at this temperature for 2 hours, add 20% NaOH solution to adjust the pH to 7, then heat up and distill and dehydrate to get reddish brown The transparent resin is a cardanol-modified alkyl resorcinol formaldehyde resin, and the softening point of the resin is 93°C.
Embodiment 2
[0024] According to resorcinol, cardanol, formaldehyde solution, styrene, and p-toluenesulfonol, the raw materials are weighed according to the following weight ratio: resorcinol: cardanol: formaldehyde solution: styrene: p-toluenesulfonol is 55:32.5 :30:35:0.75.
[0025] Put resorcinol, cardanol, formaldehyde solution, styrene, and p-toluenesulfonol into the reactor by weight and mix them evenly. When the temperature rises to 120-130°C, start to add styrene dropwise and finish dropping in 25-35 minutes After dropping, keep it for 1.5 hours, drop the temperature to 90-110°C and start adding formaldehyde solution, drop it in 55-65 minutes, then react at this temperature for 2 hours, add 20% NaOH solution to adjust the pH to 7, and then The reddish-brown transparent resin obtained by heating and distilling and dehydrating is the cardanol-modified alkyl resorcinol formaldehyde resin, and the softening point of the resin is 97°C.
Embodiment 3
[0027] According to resorcinol, cardanol, formaldehyde solution, styrene, and p-toluenesulfonol, the raw materials are weighed according to the following weight ratio: resorcinol: cardanol: formaldehyde solution: styrene: p-toluenesulfonol is 60:40 :35:40:1.0;
[0028] Put resorcinol, cardanol, formaldehyde solution, styrene, and p-toluenesulfonol into the reactor by weight and mix them evenly. When the temperature rises to 120-130°C, start to add styrene dropwise and finish dropping in 25-35 minutes After dropping, keep it for 1.5 hours, drop the temperature to 90-110°C and start adding formaldehyde solution, drop it in 55-65 minutes, then react at this temperature for 2 hours, add 20% NaOH solution to adjust the pH to 7, and then The reddish-brown transparent resin obtained by heating and distilling and dehydrating is the cardanol-modified alkyl resorcinol formaldehyde resin, and the softening point of the resin is 102°C.
[0029] The softening point of the resin synthesize...
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