Method for preparing CHDI (1,4-Cyclohexane Diisocyanate) modified MDI (4,4'-Diphenylmethane Diisocyanate) based polyurethane micropore elastomer
A microporous elastomer, polyurethane technology, applied in the field of materials, can solve the problems of performance impact, increase the complexity of the reaction system, shorten the service life, etc. Effect
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Embodiment 1
[0019] The concrete method that present embodiment prepares CHDI modified MDI-based polyurethane microcellular elastomer is:
[0020] Mix 5 moles of MDI and 1 mole of CHDI evenly, and react with 2.632 moles of polyethylene adipate diol with a number-average molecular weight of 1000 at 80°C for 2 hours to obtain an end-NCO group content of 7wt%. terminal isocyanate prepolymer.
[0021] 100 mass parts of polyethylene adipate glycol with a number average molecular weight of 1000 and 10 mass parts of 1,4-butanediol, 4 mass parts of water, 0.8 mass parts of retardation catalyst (Dabco 1027), 0.8 parts by mass of a foam stabilizer (DabcoDC 2585) were mixed uniformly to prepare a chain extender composition.
[0022] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted according to the ratio of the isocyanate index of 95%, and the reaction liquid is injected into a mold at 65°C, aged for 25 minutes, demoulded, and then heated a...
Embodiment 2
[0028] The concrete method that present embodiment prepares CHDI modified MDI-based polyurethane microcellular elastomer is:
[0029] Mix 4 moles of MDI and 1 mole of CHDI evenly, and react with 1.341 moles of polycaprolactone diol with a number-average molecular weight of 2000 at 80°C for 2 hours to obtain a terminal-NCO group content of 8 wt%. Polymer.
[0030] 100 mass parts of polycaprolactone diol with a number average molecular weight of 2000 and 10 mass parts of 1,4-butanediol, 4 mass parts of water, 0.8 mass parts of delayed catalyst (Dabco 1027), 0.8 Mass parts of the foam stabilizer (Dabco DC 2585) were mixed uniformly to prepare a chain extender composition.
[0031] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted at a ratio of isocyanate index of 96%, and the reaction material liquid is injected into a mold at 65°C, aged for 25 minutes, demolded, and then heated at 110°C After aging for 16 hours, a CHD...
Embodiment 3
[0033] The concrete method that present embodiment prepares CHDI modified MDI-based polyurethane microcellular elastomer is:
[0034] Mix 4 moles of MDI and 1 mole of CHDI evenly, and react with 1.07 moles of polytetrahydrofuran ether diol with a number average molecular weight of 2000 at 80°C for 2 hours to obtain a terminal isocyanate prepolymer with a terminal -NCO group content of 10 wt%. .
[0035] 100 parts by mass of polytetrahydrofuran ether glycol with a number average molecular weight of 2000, 10 parts by mass of 1,4-butanediol, water of 4 parts by mass, retardation catalyst (Dabco 1027) of 0.8 parts by mass, 0.8 parts by mass The foam stabilizer (Dabco DC2585) was mixed uniformly to prepare the chain extender composition.
[0036] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted according to the ratio of the isocyanate index of 96%. After aging for 16 hours, a CHDI-modified MDI-based polyurethane microce...
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