Manufacturing method of high temperature resistance polyurethane elastomer

A technology of polyurethane elastomer and manufacturing method, which is applied in the direction of coating, etc., can solve the problems of reduced service life, etc., and achieve the effects of excellent heat retention, good resilience, and excellent mechanical properties

Active Publication Date: 2011-06-15
TIANJIN AINY ELE MECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature is ≥100°C, there is still a certain gap between polyurethane elastomer and nitrile rubber in terms of performance retention. For example, when the temperature is 100-120°C, the performance of polyurethane elastomer is lower than that of nitrile rubber. The life expectancy is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: prepare high temperature resistant polyurethane elastomer, the steps are as follows:

[0022] 1) Preparation of polyurethane prepolymer: The polyurethane prepolymer was prepared according to a conventional method. Weighed 100 parts by mass of polyethylene adipate diol with a number average molecular weight of 2000, put it into a reaction kettle, heated to 130° C., and pumped Vacuum until the residual pressure in the kettle is less than 500pa, dehydrate for 3 hours, and after cooling down to 120°C, add 19 parts by mass of 1,5-naphthalene diisocyanate, raise the temperature to 130°C and react for half an hour to obtain a prepolymer. The mass percent content of cyanate is 2.86%;

[0023] 2) Prepare the chain extender: take 100 parts by weight of dehydrated polyethylene adipate diol with a number average molecular weight of 2000, put it into a preparation kettle and keep it warm at 55°C, weigh 10 parts by weight of distilled water, 10 parts by mass of emulsif...

Embodiment 2

[0027] Embodiment 2: prepare high temperature resistant polyurethane elastomer, the steps are as follows:

[0028] 1) Preparation of polyurethane prepolymer: The polyurethane prepolymer was prepared according to a conventional method. Weighed 100 parts by mass of polyethylene adipate diol with a number average molecular weight of 2000, put it into a reaction kettle, heated to 130° C., and pumped Vacuum until the residual pressure in the kettle is less than 500pa, dehydrate for 3 hours, cool down to 120°C, add 25 parts by mass of 1,5-naphthalene diisocyanate, raise the temperature to 130°C and react for half an hour to obtain a prepolymer. The mass percent content of cyanate is 4.64%;

[0029] 2) Prepare the chain extender: weigh 100 parts by weight of dehydrated polyethylene adipate diol with a number average molecular weight of 2000, put it into a preparation kettle and keep it warm at 55°C, weigh 10 parts by weight of distilled water, 10 parts by mass of emulsifier, vigorou...

Embodiment 3

[0033] Embodiment 3: prepare high temperature resistant polyurethane elastomer, the steps are as follows:

[0034]1) Preparation of polyurethane prepolymer: The polyurethane prepolymer was prepared according to a conventional method. Weighed 100 parts by mass of polyhexamethylene adipate diol with a number average molecular weight of 2000, put it into a reaction kettle, heated to 130° C., and pumped Vacuum until the residual pressure in the kettle is less than 500pa, dehydrate for 3 hours, cool down to 70°C, add 30 parts by mass of 3,3'-dimethyl-4,4'-biphenyl diisocyanate, heat up to 100°C for 2 hours, To obtain a prepolymer, the mass percent content of isocyanate in the prepolymer is 4.11%;

[0035] 2) Prepare the chain extender: take 100 parts by mass of polyhexanediol adipate diol with a number average molecular weight of 2000 that has been dehydrated, put it into a preparation kettle and keep it warm at 55°C, weigh 10 parts by mass of distilled water, 10 parts by mass of ...

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Abstract

The invention discloses a manufacturing method of high temperature resistance polyurethane elastomer, comprising the following steps: 1) polyurethane prepolymer is prepared, the molecular weight of oligomer polyalcohol is 2000, and the content of isocyanato in the prepolymer is 2.5-8.0%; 2) a prepared chain extender is composed of polyester polyol, emulsifier and distilled water; 3) a casting machine mixes the prepolymer and the chain extender according to set proportion, and pours the prepolymer and the chain extender into a preheated tray for vulcanization; and 4) the semi-finished product obtained in step 3) is pulverized into particles which are injected for shaping in an injection machine, and annealing treatment is carried out after auto-vulcanization. The invention has the following advantages: the manufacturing method is simple and practical, the prepared polyurethane elastomer has favourable thermal stability of mechanical properties; tensile strength retention rate at the temperature of 120 DEG C is 60% at least; the polyurethane elastomer of the invention has favourable rebound resilience with the rebound rate of at least 70%, so that the polyurethane elastomer of the invention is suitable for manufacturing and application in large scale.

Description

Technical field [0001] The invention relates to the manufacturing technology of polyurethane materials, in particular to a manufacturing method of high-temperature-resistant polyurethane elastomers. Background technique [0002] Polyurethane elastomers are gradually replacing rubber applications in the fields of sealing rings and shock absorption due to their similar elasticity to rubber and far superior mechanical strength and wear resistance. However, when the temperature is ≥100°C, there is still a certain gap between polyurethane elastomer and nitrile rubber in terms of performance retention. For example, when the temperature is 100-120°C, the performance of polyurethane elastomer is lower than that of nitrile rubber. Life expectancy is greatly reduced. In addition, in the field of hydraulic sealing, the service life of polyurethane elastomer sealing rings below 80°C is 3 to 5 times that of nitrile rubber, while the service life at 100°C is only half of that of nitrile ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/00B29C39/44B29C35/02C08G18/42C08G18/10
Inventor 胡兴平
Owner TIANJIN AINY ELE MECHANICAL
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