CN102350333A

CN102350333A - Modified nano titanium dioxide catalyst

Info

Publication number: CN102350333A
Application number: CN2011102496690A
Authority: CN
Inventors: 钱华; 张林荣
Original assignee: WUJIANG BEISHE SHENGYUAN TEXTILE AUXILIARIES FACTORY
Current assignee: WUJIANG BEISHE SHENGYUAN TEXTILE AUXILIARIES FACTORY
Priority date: 2011-08-29
Filing date: 2011-08-29
Publication date: 2012-02-15

Abstract

The invention discloses a modified nano titanium dioxide catalyst. The modified nano titanium dioxide catalyst is obtained by the following steps of: a, preparing 30 to 70g/L nano titanium dioxide suspension by using nano titanium dioxide powder and deionized water; b, adjusting pH to be 4 to 5 by using acetic acid or ethylic acid, and dispersing by using ultrasonic waves and a high-speed shearing machine for 10 to 30 minutes; c, adding 5 to 15g/L KH 550, raising temperature to 70 to 90 DEG C, and reacting with high-speed stirring for 2 to 4h; and d, filtering and washing a reaction product, drying at the temperature of between 80 and 120 DEG C for more than 12h, and crushing to obtain fine powder. The mechanical property of a polyurethane material obtained by the modified nano titanium dioxide catalyst is greatly improved, and specifically the tensile strength of the polyurethane material is improved by 90 percent compared with that of the common polyurethane and a shape recovery rate can be kept above 94 percent.

Description

The modified nano-titanium dioxide catalyst

Technical field

The invention belongs to chemical field, relate in particular to the preparation of nano titanic oxide catalyst.

Background technology

Elastic shape memory polyurethane is owing to have high resilience, good resistance pinking and adaptability; Have simultaneously wear-resisting, the oil resistant of conventional polyurethanes, anti-ozone, characteristic such as water-fast again; Therefore be widely used in biomedical sector, on textile applications, can obtain high waterproof moisture permeating fabric simultaneously.And to obtain the catalyst that these characteristics must be special; Usually used nano TiO 2 is owing to have high specific area; Therefore be a good selection, if but the nano titanic oxide catalyst on the market directly use, then the properties of product of Huo Deing can not be guaranteed.

Summary of the invention

Goal of the invention:, the invention provides a kind of nano titanic oxide catalyst through modification in order to obtain the elastic shape memory polyurethane material.

Technical scheme: for realizing the foregoing invention purpose; Following technical scheme is adopted in this and invention: a kind of modified nano-titanium dioxide catalyst makes through following steps: a, nano titanium dioxide powder is mixed with the nano titanium oxide suspension of 30 ~ 70g/L with deionized water; B, to use acetic acid or acetate to regulate pH then be 4 ~ 5, and with ultrasonic wave and high-speed shearing machine dispersion 10 ~ 30min; C, then add the KH550 of 5 ~ 15g/L, and be warmed up to 70 ~ 90 ℃, react 2 ~ 4h down stirring fast; D, product is filtered and washing, 80 ~ 120 ℃ down more than the dry 12h after, be ground into fine particle.

Beneficial effect: compared with prior art; The present invention has the following advantages: the polyurethane material mechanical performance that obtains through the modifying titanium dioxide catalyst is greatly enhanced; Especially the relative conventional polyurethanes of its hot strength has improved 90%, and the recovery of shape rate can remain on more than 94%.

The specific embodiment

Below in conjunction with embodiment, technical scheme of the present invention is elaborated, but protection scope of the present invention is not limited to said embodiment.

In pure water, slowly pour nano titanium dioxide powder (purchasing ten thousand scape new material Co., Ltds) into to Hangzhou; Be mixed with the tio_2 suspension of 50g/L; And with acetic acid adjusting pH to 4.0; High-speed stirred is disperseed 30min under action of ultrasonic waves then; Then, be heated to 80 ℃ of reaction 3h after stirring with the KH550 (3-aminopropyl triethoxysilane) of 10g/L; Then product is filtered and spend deionised water 3 times,, at last products therefrom is ground into fine particle with pulverizer, promptly get the modified manometer silicon dioxide catalyst at 100 ℃ of oven dry 12h down.

Utilize MDI-TMP type polyurethane that above-mentioned nanometer titanium dioxide Si catalyst obtains to improve 90%, and the recovery of shape rate remain on more than 94% with respect to the hot strength of conventional polyurethanes; Conventional polyurethanes is 7.7% through permanent deformation after 10 cyclic deformation processes, and this product then only is 3.5%.

Claims

1. a modified nano-titanium dioxide catalyst is characterized in that, makes through following steps:

A, nano titanium dioxide powder is mixed with the nano titanium oxide suspension of 30 ~ 70g/L with deionized water;

B, to use acetic acid or acetate to regulate pH then be 4 ~ 5, and with ultrasonic wave and high-speed shearing machine dispersion 10 ~ 30min;

C, then add the KH550 of 5 ~ 15g/L, and be warmed up to 70 ~ 90 ℃, react 2 ~ 4h down stirring fast;

D, product is filtered and washing, 80 ~ 120 ℃ down more than the dry 12h after, be ground into fine particle.