Preparation method of polyurethane elastomer with ultra-high hardness and high tenacity
A polyurethane elastomer with high hardness technology, applied in the field of polyurethane elastomer preparation, can solve the problems that the hardness and toughness cannot meet the needs of rubber rollers, etc., to prolong the curing time, improve processing performance, and increase tensile strength and hardness Effect
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Example Embodiment
[0025] Example 1
[0026] Add 480g of PBA with a molecular weight of 1000 to a three-necked flask equipped with a stirrer, a thermometer and a vacuum tube, add 0.1% of PBA mass of stannous octoate and PBA of 0.2% 2,6-di-tert-butyl-4-methylphenol, Heat up and vacuum, dehydrate at 110°C and 0.13kPa for 2 to 3 hours, then lower the temperature to 75°C, add 280g of HMDI and mix thoroughly, react at 80°C for 3 hours to prepare a prepolymer;
[0027] Fully mix the prepolymer and epoxy resin, and react at 60° C. for 2 hours to prepare epoxy-terminated polyurethane-epoxy resin;
[0028] Put a metered amount of the epoxy-terminated polyurethane-epoxy resin into the reactor, raise the temperature to 80°C, vacuum degas under the condition of 0.1kpa until no bubbles are generated, add a metered amount of 1,4-butanediol, Quickly stir for 5 minutes, mix well and immediately pour it into a mold preheated to 100°C, cure at 100°C for 16 hours, and then post-curing at room temperature for 7 days to p...
Example Embodiment
[0030] Example 2
[0031] To a three-necked flask equipped with a stirrer, a thermometer and a vacuum tube, add 2.1Kg of PCL with a molecular weight of 2000, add 0.1% of PCL mass of stannous octoate and 0.2% of PBA mass of 2,6-di-tert-butyl-4-methyl Phenol, heated and vacuumed, dehydrated at 110°C and 0.13kPa for 2h, then cooled to 70°C, added 1.225Kg of HMDI and mixed thoroughly, reacted at 85°C for 3h to prepare a prepolymer;
[0032] Fully mix the prepolymer and epoxy resin, and react at 60° C. for 2 hours to prepare epoxy-terminated polyurethane-epoxy resin;
[0033] Put the measured amount of the epoxy-terminated polyurethane-epoxy resin into the reactor, raise the temperature to 80°C, vacuum degas under the condition of 0.1kpa until no bubbles are generated, add the measured amount of 1,3-propanediol, and stir quickly After mixing for 5 minutes, immediately pour it into a mold preheated to 100°C, cure at 100°C for 16 hours, and then post-curing at room temperature for 7 days t...
Example Embodiment
[0035] Example 3
[0036] Add PHA3Kg with a molecular weight of 2000 to a three-necked flask equipped with a stirrer, a thermometer and a vacuum tube, add 0.1% of PHA mass of stannous octoate and PBA mass of 0.2% 2,6-di-tert-butyl-4-methylphenol, Heat up and vacuum, dehydrate at 120°C and 0.13kPa for 2h, then lower the temperature to 70°C, add 1.75Kg of HMDI and mix well, react at 85°C for 3h to prepare a prepolymer;
[0037] Fully mix the prepolymer and epoxy resin, and react at 60° C. for 2 hours to prepare epoxy-terminated polyurethane-epoxy resin;
[0038] Put a metered amount of the epoxy-terminated polyurethane-epoxy resin into the reactor, raise the temperature to 80°C, vacuum degas under the condition of 0.1kpa until no bubbles are generated, add a metered amount of 1,4-cyclohexanol, Quickly stir for 5 minutes, mix well and immediately pour it into a mold preheated to 100°C, cure at 100°C for 16 hours, and then post-curing at room temperature for 7 days to prepare an ultra-h...
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