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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[0086] Example 1
[0087] 100g of phenol and 109g of 50% by weight formaldehyde solution were sequentially added to the reactor, and then 1g of triethylamine was added, and the temperature was slowly raised to 80°C. After 120 minutes of reaction, the reaction solution was cooled and acid was added to adjust the pH of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1500mPa·s / 25℃, the water content is 3%, and the hydroxyl value is 280mgKOH / g.
Example Embodiment
[0088] Example 2
[0089] 100g of phenol and 96g of 50% by weight formaldehyde solution were sequentially added to the reactor, then 1.5g of triethylamine was added, and the temperature was slowly raised to 85°C. After 120 minutes of reaction, the reaction solution was cooled and acid was added to adjust the pH of the system to 7. Dehydration to obtain modified phenolic resin. The viscosity is controlled at 1800mPa·s / 25°C, the water content is 2%, and the hydroxyl value is 260mgKOH / g.
Example Embodiment
[0090] Example 3-8
[0091] The flame-retardant polyurethane composition of the present invention is formed with 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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