Synthesis of low normal temperature foamable phenolic resin and method for preparing phenolic foam
A technology of phenolic resin and synthesis method, which is applied in the field of synthesis of phenolic resin and preparation of phenolic foam at low normal temperature, which can solve problems such as environmental pollution and difficult production control, achieve strong controllability, good strength, and reduce investment in fixed assets Effect
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Embodiment 1
[0026] Add 800 kg of phenol and 15 kg of 30% sodium hydroxide solution into a 2-ton reactor, add 320 kg of paraformaldehyde in 7 times at about 80°C, react at 80°C for 30 minutes, then raise the temperature to 95°C for 30 minutes , the temperature was lowered to 85°C and 10 kg of urea was added to react for 50 minutes, and the temperature was lowered to 55°C to obtain a phenolic resin with a viscosity of 2000cp / 25°C.
[0027] Take 100 parts of the above phenolic resin, 3 parts of Tween-80, 5 parts of petroleum ether, 2 parts of xylenesulfonic acid, and 6 parts of p-toluenesulfonic acid, stir at room temperature for 10 seconds at 15°C, and obtain cured phenolic resin after 2 minutes Foam plastic with a density of 40 kg per cubic meter.
Embodiment 2
[0029] Add 800 kg of phenol and 4 kg of 30% potassium hydroxide solution into a 2-ton reactor, add 400 kg of paraformaldehyde in 7 times at around 70°C, react at 70°C for 60 minutes, then raise the temperature to 100°C for 15 minutes , the temperature was lowered to 90°C and 8 kg of urea was added to react for 20 minutes, and the temperature was lowered to 55°C to obtain a phenolic resin with a viscosity of 2000cp / 25°C.
[0030] Take 100 parts of the above phenolic resin, 1 part of silicone oil H-330, 2 parts of n-pentane, 5 parts of xylenesulfonic acid, and 10 parts of p-toluenesulfonic acid, stir at room temperature for 2 minutes at 30°C, and then solidify after 5 minutes Phenolic foam plastic with a density of 40 kg per cubic meter.
Embodiment 3
[0032] Add 800 kg of phenol and 10 kg of zinc acetate into a 2-ton reactor, add 480 kg of paraformaldehyde in 7 times at about 85°C, react at 85°C for 20 minutes, raise the temperature to 97°C for 25 minutes, and cool down to 85°C Add 40 kg of dicyandiamide to react for 100 minutes, cool down to 55°C to obtain phenolic resin with a viscosity of 2000cp / 25°C.
[0033] Take 100 parts of the above phenolic resin, 4 parts of Tween-80, 8 parts of petroleum ether, and 12 parts of p-toluenesulfonic acid, stir at room temperature for 15 minutes at 5°C, and obtain a cured phenolic foam after 3 minutes, with a density of 40 kg per cubic meter.
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