Method for developing low-density high-strength phenolic foam
A phenolic foam, high-strength technology, applied in the field of building exterior wall materials, can solve problems such as brittleness, ineffective toughening effect of phenolic foam, and limited application range of phenolic foam
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Embodiment 1
[0024] Add 94 parts of phenol, 3 parts of catalyst (50% sodium hydroxide solution), 6 parts of urea and 2 parts of modified molybdenum disulfide into the four-necked bottle, raise the temperature to 50~70°C, add 20 parts of formaldehyde, and react for a while Then add 80 parts of paraformaldehyde, react for a period of time and then add 3 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 70°C, and then add formic acid to adjust pH to neutral, cooled and discharged to obtain the required phenolic resin; in the four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 4 parts of surfactant, 4 parts of foaming agent and 20 parts of curing agent are mixed evenly and then poured into the mold and placed in a drying oven at 70°C for foaming. After meeting the foaming requirements, take out the mold and c...
Embodiment 2
[0026] Add 90 parts of phenol, 3 parts of catalyst (50% sodium hydroxide solution), 5 parts of urea and 2 parts of modified molybdenum disulfide into a four-necked bottle, raise the temperature to 50~70°C, add 26 parts of formaldehyde, and react for a period of time Finally, add 74 parts of paraformaldehyde, react for a period of time, then add 3 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 73°C, and then add formic acid to adjust pH to neutral, cooled and discharged to obtain the required phenolic resin; in the four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 4 parts of surfactant, 5 parts of foaming agent and 22 parts of curing agent are mixed evenly and then poured into the mold and placed in a drying oven at 70°C for foaming. After meeting the foaming requirements, take out the mo...
Embodiment 3
[0028] Add 98 parts of phenol, 4 parts of catalyst (50% sodium hydroxide solution), 7 parts of urea and 3 parts of modified molybdenum disulfide into the four-necked bottle, raise the temperature to 50~70°C, add 30 parts of formaldehyde, and react for a period of time Then add 70 parts of paraformaldehyde, react for a period of time and then add 4 parts of catalyst, raise the temperature to 80~85°C and react for 2~3 hours, when the viscosity of the resin reaches 2000~8000 mPa·S, cool down to 74°C, and then add formic acid to adjust pH to neutral, cooling and discharging to obtain the required phenolic resin; in a four-necked bottle, add 100 parts of the phenolic resin modified by the coupling agent grafted molybdenum disulfide in proportion, and then add 6 parts of surfactant, 5 parts of foaming agent and 25 parts of curing agent are mixed evenly and poured into the mold, and foamed in a drying oven at 70°C. After meeting the foaming requirements, the mold is taken out and cool...
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