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Sepiolite/polyurethane nanocomposite material and preparation method thereof

A nano-composite material and sepiolite technology, applied in the field of polyurethane materials, can solve problems such as limited application range, insignificant improvement in mechanical properties, insufficient combination of polyurethane and sepiolite, etc., to achieve wide application range and overcome insufficient reaction , remarkable effect on thermal stability

Inactive Publication Date: 2012-11-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above literature, although sepiolite improves the mechanical properties and thermal properties of polyurethane, the combination of polyurethane and sepiolite is not sufficient, the improvement of mechanical properties is not obvious, and the application range is very limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A sepiolite / polyurethane nanocomposite material and a preparation method thereof. Its preparation steps are:

[0028] Step 1, preparation of organically modified sepiolite

[0029] First add 2~4wt% sepiolite and 88~90wt% deionized water to the reactor, stir for 0.5~0.7 hours, then add 8~10wt% organic modifier, stir at 30~60°C for 1 ~2 hours, filter, wash, take out and dry in the air at 80~100°C to obtain organically modified sepiolite.

[0030] Step 2, preparation of sepiolite / polyurethane nanocomposite

[0031] First add 5~8wt% solvent and 6~10wt% organically modified sepiolite to the reactor, mix well, stir and dehydrate at 80~100°C for 2~3 hours; then add 20~25wt% isocyanate and 3~4wt% catalyst, stirred at 50~70°C for 1~3 hours; then added 43~47wt% polymer diol, stirred at 50~70°C for 1~3 hours, obtained Polyurethane prepolymer: defoam the prepared polyurethane prepolymer at 50~70°C for 20~60 minutes, add 5~9wt% chain extension crosslinking agent and 1~3wt% auxil...

Embodiment 2

[0035] A sepiolite / polyurethane nanocomposite material and a preparation method thereof. Except following raw material, all the other are with embodiment 1:

[0036]The organic modifier is cetyltrimethylammonium bromide; the solvent is xylene; the diisocyanate is toluene-2,4-diisocyanate; the catalyst is triethylenediamine; the polymer diol is polytetrahydrofuran ether di Alcohol with a molecular weight of 2000~3000; the chain-extending cross-linking agent is a mixture of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 3,5-dimethylthiotoluenediamine.

[0037] The sepiolite / polyurethane nanocomposite material prepared in this example is tested: the tensile strength is 32.1-41.8MPa, the elongation at break is 560-674%, and the initial thermal decomposition temperature is 305.7-309.6°C.

Embodiment 3

[0039] A sepiolite / polyurethane nanocomposite material and a preparation method thereof. Except following raw material, all the other are with embodiment 1:

[0040] The organic modifier is cetyltrimethylammonium bromide; the solvent is xylene; the diisocyanate is a mixture of toluene-2,4-diisocyanate and 4,4'-diphenylmethane diisocyanate; the catalyst is three Ethylene diamine; the polymer diol is polytetrahydrofuran ether diol, the molecular weight is 3000~4000; the chain-extending cross-linking agent is 3,3'-dichloro-4,4'-diaminodiphenylmethane and 1, 4-butanediol mixture.

[0041] The sepiolite / polyurethane nanocomposite material prepared in this example was tested: the tensile strength was 28.5-36.7 MPa, the elongation at break was 601-721%, and the initial thermal decomposition temperature was 302.7-311.8°C.

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Abstract

The invention relates to a sepiolite / polyurethane nanocomposite material and a preparation method thereof. The preparation method comprises the following steps: 1, adding 2 to 10 weight percent of sepiolite, 85 to 90 weight percent of deionized water and 4 to 10 weight percent of organic modifier into a reactor, stirring at the temperature of 30 to 100 DEG C for 1 to 4 hours, filtering, washing and airing to prepare organic modified sepiolite; and 2, adding 5 to 10 weight percent of solvent, 1 to 10 weight percent of organic modified sepiolite, 10 to 25 weight percent of diisocyanate and 0 to 4 weight percent of catalyst into the reactor and stirring at the temperature of 100 DEG C for 1 to 5 hours, adding 40 to 55 weight percent of polymer dibasic alcohol and stirring to prepare a polyurethane prepolymer, mixing the polyurethane prepolymer with 3 to 10 weight percent of chain-extending crosslinking agent and 1 to 6 weight percent of aid, pouring, demoulding and re-vulcanizing at the temperature of 60 to 120 DEG C for 10 to 4 hours to prepare the sepiolite / polyurethane nanocomposite material. The product obviously improves the tensile strength on the premise of maintaining the breaking elongation of a polyurethane elastomer, obviously enhances the thermal stability and has wide application range.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a sepiolite / polyurethane nanocomposite material and a preparation method thereof. technical background [0002] Polyurethane has a hard and soft block structure and exhibits many excellent properties, such as low temperature resistance, wear resistance and wide hardness range, so it is widely used. However, the heat resistance and mechanical properties are not good, and there are many modification methods according to its characteristics, such as adjusting its molecular structure or adding organic and inorganic fillers. Inorganic fillers are usually introduced into polyurethane, although it can play a reinforcing role, but the phenomenon of increased strength and decreased elongation at break often occurs. [0003] When the nano-inorganic filler fills the polymer to form a nano-hybrid material, due to the nano-size effect and the huge specific surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/10C08K9/06C08K9/04C08K7/10
Inventor 陈红祥周瑜郑加英熊肖卢会珍
Owner WUHAN UNIV OF SCI & TECH
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