Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of polyurethane microcellular elastomer

A technology of microcellular elastomer and polyurethane, which is applied in the field of shock absorption system, can solve problems such as hysteresis, large intermolecular force, and material temperature rise, and achieve the effects of prolonging service life, reducing internal heat generation, and reducing heat

Active Publication Date: 2018-09-07
上海凯众聚氨酯有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the large number of polar groups in polyurethane microcellular elastomers, the large intramolecular and intermolecular forces, and the possible existence of other factors that hinder the free rotation of single bonds, the stress and strain of polyurethane microcellular elastomers cannot It reaches equilibrium in an instant, and it shows a hysteresis phenomenon under the action of alternating stress, causing internal heat generation and a sudden increase in the internal temperature of the material, which seriously affects the performance of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of polyurethane microcellular elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add ethanol and nano-calcium carbonate into the reactor according to the mass ratio of 1:1, and add 1.5% of the mass of nano-calcium carbonate as surface treatment agent aluminate and monooxyalkyl titanate coupling agent according to the ratio of 1:2 The column was mixed and heated to 40°C, and the stirring was continued for 30 minutes. The polycaprolactone dibasic alcohol of number-average molecular weight 2000 is joined in the nano-calcium carbonate system, accounts for the amount of polycaprolactone dibasic alcohol according to the amount of nano-calcium carbonate is 5% to add, stirs 20min, vacuumizes, heats up, 3 After one hour, 4,4-diphenylmethane diisocyanate was added according to the amount of terminal-NCO% = 8%, to prepare a prepolymer.

[0021] For the preparation of the chain extender, 100 g of 1,4-butanediol, 2 g of water, 2 g of foam stabilizer and 0.3 g of catalyst were mixed uniformly.

[0022] The ratio of prepolymer to chain extender is 100:8.

[0023...

Embodiment 2

[0025] The content of the nano-calcium carbonate in Example 1 is replaced by 8%, added to polytetrahydrofuran diol with a number-average molecular weight of 3000, stirred for 30min, vacuumized, heated, and after 3 hours, excessive 4,4- Diphenylmethane diisocyanate to obtain a prepolymer with -NCO%=7%.

[0026] The components for preparing the chain extender are: 100 g of 1,4-butanediol, 1.5 g of water, 2 g of a foam stabilizer, and 0.3 g of a catalyst, and mix well.

[0027] The ratio of prepolymer to chain extender is 100:7.

[0028] Mix the prepolymer and chain extender components evenly through a low-pressure foaming machine, pour into a mold at a temperature of 90°C, and post-cure in an oven at 110°C for 15 hours after demoulding. Then post-curing treatment was performed to test the temperature rise and other properties in dynamic fatigue.

Embodiment 3

[0030] Add ethanol and nano-calcium carbonate into the reaction kettle at a mass ratio of 1:2, add monooxyalkyl titanate of 2% of the mass of nano-calcium carbonate, heat to 40°C, and continue stirring for 30 minutes. Add polyether diol with a number average molecular weight of 2000 to the nano-calcium carbonate system, add it according to the amount of nano-calcium carbonate accounting for 6% of the polyether diol, stir for 20 minutes, vacuumize, heat up, and after 3 hours, according to the end 4,4-diphenylmethane diisocyanate was added in an amount of -NCO%=10%, to prepare a prepolymer.

[0031] For the preparation of chain extender, 95g of 1,4-butanediol, 5g of diethylene glycol, 3g of water, 2g of foam stabilizer and 0.3g of catalyst were mixed uniformly.

[0032] The ratio of prepolymer to chain extender is 100:10.

[0033] Mix the prepolymer and chain extender components evenly through a low-pressure foaming machine, pour into a mold at a temperature of 90°C, and post-c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Functional group degreeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a manufacturing method of polyurethane microporous elastomer. The method comprises technical processes including preparation of a pre-polymer, preparation of a chain extender, casting, and post-curing. According to the method, interior heat of a product is reduced, dynamic fatigue performance is improved, and service life of the product is prolonged. Application field of the elastomer can be further developed, and the elastomer can be mainly used to damping systems of automobiles, bridges, and elevators.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane microporous elastomer, which is mainly used in shock absorbing systems of automobile bridges and elevators. Background technique [0002] Polyurethane microcellular elastomer, also known as foamed polyurethane elastomer, has excellent properties such as good mechanical properties, wear resistance, oil resistance, tear resistance, chemical corrosion resistance, radiation resistance, and good adhesion, especially MDI type polyurethane Microcellular elastomer has low vapor pressure and low toxicity. Therefore, people have been devoting themselves to the development of MDI polyurethane for many years, and the market share has been increasing. [0003] Due to the large number of polar groups in polyurethane microcellular elastomers, the large intramolecular and intermolecular forces, and the possible existence of other factors that hinder the free rotation of single bonds, the stress and strain...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/44C08G18/32C08G18/10C08G18/12C08K9/04C08K3/26C08J9/08
Inventor 李明英范春晓闫贺佳
Owner 上海凯众聚氨酯有限公司