Preparation method of low-compression and permanent-deformation microcellular polyurethane elastomer

A microcellular elastomer and permanent deformation technology, which is applied in the field of preparation of microcellular elastomer materials, can solve the problems of poor compression permanent deformation performance of polyurethane microcellular elastomers, etc.

Active Publication Date: 2013-01-02
CHANGCHUN A&Z SCI CO LTD
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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 solve the problem that the compression set performance of the polyurethane microcellular elastomer obta

Method used

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  • Preparation method of low-compression and permanent-deformation microcellular polyurethane elastomer

Examples

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preparation example Construction

[0021] The invention provides a method for preparing a polyurethane microcellular elastomer with low compression set, comprising the steps of:

[0022] Step 1: react the polymer polyol with p-phenylene diisocyanate at 70-80°C to obtain a prepolymer, and the -NCO group content in the prepolymer is ≤6.2%;

[0023] Step 2: mixing polyol, blowing agent, catalyst 1, catalyst 2 and surfactant in a mass ratio of 100: 4-8: 0.8-1.2: 0.4-0.6: 2-6 to obtain a chain extender; The polyhydroxyl compound includes 10% to 35% polyester polyol, 50% to 75% glycol and 2% to 35% crosslinking agent by weight, and the catalyst 1 is organic carboxylic acid Dialkyltin salt, catalyst 2 is an amine catalyst;

[0024] Step 3: Mix the prepolymer obtained in step 1 with the chain extender obtained in step 2, stir evenly to obtain a mixed material, vulcanize and demould the mixed material to obtain a product;

[0025] Step 4: Post-vulcanize the product obtained in Step 3 to obtain a polyurethane microcell...

Embodiment 1

[0037] Place 100 g of polycaprolactone with a number average molecular weight of 1000 in a 1-liter three-necked bottle, set the temperature to 100°C, remove the water in the polycaprolactone polyol in a vacuum environment, and lower the temperature to 70°C , under the protection of nitrogen atmosphere, add 32g of p-phenylene diisocyanate into the three-necked flask, stir at a speed of 1000rmp for 2.5h, and calibrate the prepolymer-NCO% content of 6.2%;

[0038] Mix polyol, water, tin dioctoate, triethylenediamine and diethylamine oleate in a mass ratio of 100: 6: 1: 0.5: 4 to obtain 7.3g of chain extender, the polyhydroxy The compound contains 0.73g polycaprolactone, 3.47g ethylene glycol, 2.0g 1,2-propanediol, 1.1g trimethylolpropane with a molecular weight of 500g / mol;

[0039]Quickly add the chain extender to the prepolymer, set the stirring speed to 1000rpm, and the stirring time to 30s to obtain a mixed material, quickly inject the prepared mixed material into a 110°C vul...

Embodiment 2

[0041] Place 100 g of polycaprolactone with a number average molecular weight of 3000 in a 1L three-necked bottle, set the temperature at 120°C, remove the water in the polycaprolactone polyol in a vacuum environment, and lower the temperature to 80°C, Under the protection of a nitrogen atmosphere, 10.67 g of p-phenylene diisocyanate was added to a three-necked flask, stirred at a speed of 1000 rpm for 2.5 hours, and the prepared prepolymer-NCO% content was calibrated to 2.5%;

[0042] Polyol, water, tin laurate, pentamethyldiethylenetriamine and dimethyl polysiloxane are mixed in a mass ratio of 100: 8: 1.2: 0.6: 6 to obtain 3.2 g of chain extenders, 0.48g polycaprolactone, 0.96g 1,4-butanediol, 0.64g 1,3-propylene glycol, 1.12g sorbitol with a molecular weight of 1000g / mol are included in the polyhydroxy compound;

[0043] Quickly add the chain extender to the prepolymer, set the stirring speed to 1700rpm, and the stirring time to 10s to obtain a mixed material, quickly inje...

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Abstract

The invention provides a preparation method of a low-compression and permanent-deformation microcellular polyurethane elastomer, belonging to the field of a preparation method of a microcellular elastomer. The preparation method solves the problem that the microcellular polyurethane elastomer obtained by the existing preparation method is poor in compression and permanent-deformation performance. The method comprises the following steps: reacting a polymer polyol and p-phenylene diisocyanate at 70-80 DEG C to obtain a prepolymer, wherein the content of -NCO group in the prepolymer is less than or equal to 6.2%; and then mixing polyhydroxy compound with a foaming agent, a catalyst 1, a catalyst 2 and a surfactant to obtain a chain extender, then uniformly stirring the obtained prepolymer and chain extender to obtain a mixture, vulcanizing, demolding and after-vulcanizing the mixture to obtain the low-compression and permanent-deformation microcellular polyurethane elastomer. The microcellular polyurethane elastomer prepared by the method has the static-compression and permanent-deformation performance up to 0.53%.

Description

technical field [0001] The invention belongs to the field of preparation methods of microporous elastomer materials, and in particular relates to a preparation method of polyurethane microporous elastomers with low compression set. Background technique [0002] Due to the excellent dynamic and static mechanical properties of polyurethane microcellular elastomers, it is especially suitable for anti-vibration and damping systems, and most of the products are used in vibration-damping buffer systems in the automotive industry. The same polyurethane microcellular elastomer system, different chemical structures can produce products with completely different structures and properties. [0003] Chinese patent zl200710094632.9 discloses a preparation method of polyurethane microcellular elastomer with p-phenylene diisocyanate as the isocyanate component. The method is prepared through the steps of prepolymer preparation, mixing, molding, and post-curing. Polyurethane microcellular ...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/10C08G101/00
Inventor 王杰刘佳郇彦杨小牛
Owner CHANGCHUN A&Z SCI CO LTD
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