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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

Inactive Publication Date: 2019-04-26
苏州奥斯汀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing polyurethane elastomers with ultra-high hardness and high toughness, so as to solve the problem that polyurethane elastomers in the prior art cannot meet the needs of rubber rollers in terms of hardness and toughness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the there-necked flask that stirrer, thermometer, vacuum tube are equipped with, add the PBA480g that molecular weight is 1000, add the stannous octoate of 0.1% of PBA quality and the 2,6-di-tert-butyl-4-methylphenol of 0.2% of PBA quality, Heat up and vacuumize, dehydrate at 110°C and 0.13kPa for 2 to 3 hours, then cool down to 75°C, add 280g of HMDI and mix thoroughly, react at 80°C for 3h to prepare a prepolymer;

[0027] Fully mix the prepolymer with epoxy resin, react at 60°C for 2 hours, and prepare epoxy-terminated polyurethane-epoxy resin;

[0028] Put the metered amount of 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 metered 1,4-butanediol, Stir rapidly for 5 minutes, pour into a mold preheated to 100°C immediately after mixing evenly, cure at 100°C for 16 hours, and then post-cure at room temperature for 7 days to prepare a polyuretha...

Embodiment 2

[0031] Add PCL2.1Kg with a molecular weight of 2000 to a three-necked flask equipped with a stirrer, a thermometer, and a vacuum tube, add 0.1% stannous octoate by PCL mass and 0.2% 2,6-di-tert-butyl-4-methyl by PBA mass Phenol, heated up and vacuumed, dehydrated at 110°C and 0.13kPa for 2 hours, then cooled to 70°C, added 1.225Kg of HMDI and mixed thoroughly, reacted at 85°C for 3 hours to prepare a prepolymer;

[0032] Fully mix the prepolymer with epoxy resin, react at 60°C for 2 hours, and prepare epoxy-terminated polyurethane-epoxy resin;

[0033] Put the measured amount of epoxy-terminated polyurethane-epoxy resin into the reactor, raise the temperature to 80°C, degas under the condition of 0.1kpa until no foam occurs, add the measured amount of 1,3-propylene glycol, and stir rapidly After mixing evenly for 5 minutes, pour it into a mold preheated to 100°C, cure at 100°C for 16 hours, and post-cure for 7 days at room temperature to prepare a polyurethane elastomer with u...

Embodiment 3

[0036] In the there-necked flask equipped with stirrer, thermometer, vacuum tube, adding molecular weight is the PHA3Kg of 2000, adds the stannous octoate of PHA quality 0.1% and the 2,6-di-tert-butyl-4-methylphenol of PBA quality 0.2%, Heat up and vacuumize, dehydrate at 120°C and 0.13kPa for 2h, then cool down to 70°C, add 1.75Kg of HMDI and mix thoroughly, react at 85°C for 3h to prepare a prepolymer;

[0037] Fully mix the prepolymer with epoxy resin, react at 60°C for 2 hours, and prepare epoxy-terminated polyurethane-epoxy resin;

[0038] Put the metered amount of epoxy-terminated polyurethane-epoxy resin into the reactor, raise the temperature to 80°C, and vacuum degas under the condition of 0.1kpa until no bubbles are generated, add metered 1,4-cyclohexanol, Stir rapidly for 5 minutes, pour into a mold preheated to 100°C immediately after mixing evenly, cure at 100°C for 16 hours, and then post-cure at room temperature for 7 days to prepare a polyurethane elastomer wit...

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Abstract

The invention relates to a preparation method of a polyurethane elastomer with ultra-high hardness and high tenacity. The preparation method specifically comprises the following steps: polyether (polyester) polyols, a catalyst and an antioxidant are added into a three-necked flask, the three-necked flask is heated and vacuumized, after dewatering and cooling, HMDI is added, the mixture is sufficiently mixed to react, and a prepolymer is prepared; the prepolymer and epoxy resin are sufficiently mixed to react, and epoxy-terminated polyurethane-epoxy resin is prepared; and the metered epoxy-terminated polyurethane-epoxy resin is put into a reactor, the reactor is heated and vacuumized, vacuum degassing is carried out till no bubble is generated, a metered curing agent is added, quick stirring is carried out for several minutes, after even mixing, the epoxy-terminated polyurethane-epoxy resin is injected into a preheated mold instantly to be cured for 16 h and then after-cured for 7 d under the room temperature condition, and the polyurethane elastomer with the ultra-high hardness and the high tenacity is prepared. According to the polyurethane elastomer prepared through the method, the content of the hard segment in a molecular chain is increased, the activity of the prepolymer is lowered, and the ultra-high hardness and the high tenacity are achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of polyurethane elastomers, in particular to a preparation method of ultra-high hardness and high toughness polyurethane elastomers. Background technique [0002] Polyurethane elastomer refers to an elastomeric polymer containing more carbamate (-NHCOO-) groups in the molecular chain segment. It is composed of polyol compounds and polyisocyanates with terminal hydroxyl groups. If necessary, small molecules Polymer materials prepared by chain extender reaction. Due to the presence of soft and hard chain segments in its structure, and no or little chemical crosslinking on the molecule, the molecular chain is basically linear, so polyurethane elastomers have both the high hardness properties of plastic materials and the properties of rubber materials. It has high elasticity, excellent elasticity, wear resistance and fatigue resistance, and has oil resistance, acid and alkali resistance, environm...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/75C08G18/66C08G18/48C08G18/42C08G18/58C08G18/32
CPCC08G18/10C08G18/4238C08G18/4277C08G18/4854C08G18/758C08G18/58C08G18/3206
Inventor 周述明邓春艳汪泽恒杨向宏
Owner 苏州奥斯汀新材料科技有限公司
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