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Nanosilicon dioxide modified polyurethane elastomer and preparation method thereof

A technology of polyurethane elastomer and nano-silica, which is applied in the field of polyurethane elastomer materials, can solve the problems of the system that is difficult to uniformly disperse nanoparticles, poor compatibility, high viscosity of polymer matrix, and high surface activity of nanoparticles, so as to achieve improvement Compatibility, improvement of mechanical properties and heat resistance, effects of avoiding migration and agglomeration

Active Publication Date: 2014-08-13
安徽嘉明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

However, the surface activity of nanoparticles is high, and agglomeration is very easy to occur; coupled with the poor compatibility of polymer components and inorganic components, and the high viscosity of the polymer matrix, it is difficult to obtain a system with uniform dispersion of nanoparticles
Moreover, even nanoparticles that have been dispersed will slowly self-aggregate and agglomerate with each other

Method used

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  • Nanosilicon dioxide modified polyurethane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Component A includes the following raw materials:

[0028] Polytetrahydrofuran ether polyol (molecular weight: 2000) 100 g,

[0029] Butanediol 0.9 g,

[0030] Toluene diisocyanate 19.0 g,

[0031] Component B includes the following raw materials:

[0032] Ethyl silicate 8 g,

[0033] γ-Aminopropyltriethoxysilane 2.4 g,

[0034] MOCA 40 g.

[0035] The specific preparation steps of nano-silica modified polyurethane elastomer are as follows:

[0036] (1) Preparation of component A of the polyurethane prepolymer: Weigh 100 g of polytetrahydrofuran ether glycol and add it to a four-neck flask equipped with a stirrer, a thermometer, a feeding tube, a nitrogen connection, a vacuum connection and a dry filter tube. Remove trace moisture under reduced pressure, add 19g of toluene diisocyanate, heat up to 85°C and keep it warm for 1.5 hours, then add 1.2g of butanediol and continue the reaction for 3 hours to prepare component A of polyurethane prepolymer;

[0037] (2) P...

Embodiment 2

[0040] Component A includes the following raw materials:

[0041] Polytetrahydrofuran ether polyol 100 g,

[0042] Butanediol 1.2 g,

[0043] Diphenylmethane diisocyanate 27.5 g;

[0044] Component B includes the following raw materials:

[0045] N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane 1.2 g,

[0046] Ethyl silicate 8 g,

[0047] MOCA 40 g.

[0048] The specific preparation steps of nano-silica modified polyurethane elastomer are as follows:

[0049] (1) Preparation of component A of polyurethane prepolymer: Weigh 100g of polytetrahydrofuran ether glycol and add it into a four-necked flask equipped with a stirrer, a thermometer, a feeding tube, a nitrogen connection, a vacuum connection and a dry filter tube, and reduce Press to remove trace moisture, add 27.5g diphenylmethane diisocyanate, heat up to 85°C and keep it warm for 1.5 hours, then add 0.5g butanediol and continue the reaction for 3 hours to prepare polyurethane prepolymer component A;

[0050] (2) ...

Embodiment 3

[0053] Component A includes the following raw materials:

[0054] Polycaprolactone diol (molecular weight is 2000) 100 g,

[0055] Butanediol 0.5 g,

[0056] Diphenylmethane diisocyanate 27.5 g;

[0057] Component B includes the following raw materials:

[0058] γ-Aminopropyltriethoxysilane 2.4 g,

[0059] Ethyl silicate 8.0 g,

[0060] MDA 40 g.

[0061] The specific preparation method is as follows:

[0062] Preparation of component A of polyurethane prepolymer: Weigh 100g of polycaprolactone diol and add it to a four-necked flask equipped with a stirrer, a thermometer, a feeding tube, a nitrogen connection, a vacuum connection and a dry filter tube, and decompress and decompress. Remove trace moisture, add 27.5 g of diphenylmethane diisocyanate, heat up to 85 ° C for 1.5 h, and then add 0.5 g of butanediol to continue the reaction for 3 h to prepare component A of polyurethane prepolymer;

[0063] B: Preparation of chain extender component B: Add 40g MDA to 8g ethyl ...

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Abstract

The invention discloses a nanosilicon dioxide modified polyurethane elastomer and a preparation method thereof. The preparation method comprises the steps of enabling polyether glycol, isocyanate and micromolecular dihydroxy alcohol to be subjected to addition polymerization reaction to prepare a polyurethane prepolymer as a component A; uniformly mixing a chain extender, ethyl silicate and a silane coupling agent, carrying out in-situ hydrolysis on ethyl silicate to form nanosilicon dioxide particles, performing surface hydrophobicity modification on the nanosilicon dioxide particles by using the silane coupling agent, and removing a solvent in the mixture to obtain a component B; uniformly mixing the component A and the component B according to a certain ratio, degassing, pouring and carrying out vulcanization molding to obtain the nano-modified polyurethane elastomer. By using the preparation method, the uniform dispersion of silicon dioxide particles in polyurethane is realized, the enhancement effect of nanoparticles is sufficiently taken, the prepared polyurethane elastomer is obtained by crosslinking the nanosilicon dioxide particles, and the heat resistance and chemical stability of the polyurethane elastomer can be remarkably improved; in addition, the nanosilicon dioxide modified polyurethane elastomer can meet the requirements of a sealing element for mechanical strength, wear resistance, high elasticity and oil resistance and has a wide market prospect.

Description

technical field [0001] The invention belongs to the technical field of polyurethane elastomer materials, and relates to a preparation method of a modified polyurethane elastomer, in particular to a preparation method of in-situ generation of inorganic silicon dioxide nanoparticles rich in functional groups on the surface and modification of a polyurethane elastomer. Background technique [0002] Polyurethane is usually formed by addition polymerization of polyether or polyester macromolecular polyol, polyisocyanate and small molecule polyamine or polyol chain extender. The soft and hard segment structure in the macromolecular chain and the microscopic phase of the material The separation feature makes polyurethane have excellent mechanical properties and can be made into (foam) plastics, elastomers, fibers, coatings and adhesives, etc. Among them, polyurethane elastomer is a polymer synthetic material between general rubber and plastic. It has the high strength of plastic an...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K9/06C08K3/36C08G18/66C08G18/48C08G18/32C08G18/12
Inventor 张建安祁增荣杨建军吴庆云吴明元
Owner 安徽嘉明新材料科技有限公司
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