Method for preparing water-dispersion montmorillonite/organic block polyurethane nano composite material and uses thereof

Abstract

The invention discloses a preparation method of water dispersible montmorillonite / organosilicon blocked polyurethane nanocomposite and an application of the nanocomposite. The preparation method comprises: firstly, the organic montmorillonite, the polymer polyol and the castor oil are blended and dispersed for a plurality of hours under heating and agitation; secondly, polyol with anionic groups and polyisocyanate are added into the former mixture to process reactions, chain extension is carried out by amino alkyl polysiloxane oligomer; at last the water dispersible montmorillonite / organosilicon block polyurethane nanocomposite is obtained after the neutralization of the mixture by alkali solution and the dispersion of the mixture. The preparation method of water dispersible montmorillonite / organosilicon blocked polyurethane nanocomposite has the advantages that: the water resistance, the dimension stability and the mechanical property of the nanocomposite are increased significantly because of the adopted castor oil; because the amino alkyl polysiloxane oligomer is taken as chain extension agent, the hydrophobic property, heat resistance and surface smoothness of the polymer membrane are enhanced greatly; the dispersion and the recombination of the laminated nanometer montmorillonite further reduce the water absorption of the nanocomposite and improve the mechanical property and the hear resistance of the nanocomposite; furthermore, the water dispersible montmorillonite / organosilicon blocked polyurethane nanocomposite has simple preparation technique, easy operation and environment friendly process.

Description

Preparation method and application of water-dispersed montmorillonite / organosilicon block polyurethane nanocomposite technical field The invention relates to a preparation method and application of a water-dispersed montmorillonite / organosilicon block polyurethane nanocomposite material. Background technique Polymer / clay nanocomposites are composite materials formed by dispersing clay at the nanoscale (at least one dimension smaller than 100nm) in a polymer matrix (continuous phase) prepared by special technology. When the clay component content is 1% to 10%, due to a series of effects caused by the large specific surface area of ​​nanomaterials, they have incomparable advantages compared with conventional polymer / filler composite materials, such as high mechanical strength, Good heat resistance and water resistance. One-component self-emulsifying waterborne polyurethane has the advantages of good stability of aqueous dispersion, non-toxicity, environmental friendliness, ...

AI Technical Summary

Problems solved by technology

Due to the small molecular weight of the silane coupling agent, the siloxane segment introduced into the molecule after chain extension is relatively short, and the organic silicon content is low, so the effect of improving the hydrophobicity of the polyurethane coating film is not ideal.

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