Phenol-formaldehyde-resin-modified rigid polyurethane foam and preparation method thereof
A technology of rigid polyurethane and phenolic resin, which is applied in the field of phenolic resin modified rigid polyurethane foam and its preparation, can solve the problems of failing to meet the fire and flame retardant requirements of building materials, achieve good dimensional stability, improve oxygen index, high intensity effect
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Embodiment 1
[0087] Add 100g of phenol and 109g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1g of triethylamine, slowly raise the temperature to 80°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1500mPa·s / 25°C, the water content is 3%, and the hydroxyl value is 280mgKOH / g.
Embodiment 2
[0089] Add 100g of phenol and 96g of 50% by weight formaldehyde solution into the reactor in sequence, then add 1.5g of triethylamine, slowly raise the temperature to 85°C, react for 120min, add cooling reaction solution, and add acid to adjust the pH value of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1800mPa·s / 25℃, the water content is 2%, and the hydroxyl value is 260mgKOH / g.
Embodiment 3-8
[0091] The flame retardant polyurethane composition of the present invention is formed by the components shown in the following table and the weight ratio shown in the following table. Table 1
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[0093] Table 2
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