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Preparation method of nano silicon dioxide/ hydroxyl silane coupling agent composite modified polyurethane super-hydrophobic membrane

A technology of nano-silica and silane coupling agent, applied in the field of preparation of super-hydrophobic polyurethane film, can solve the problems of poor hydrophobicity and poor mechanical properties of water-based polyurethane film, and achieve low surface tension, no solvent residue, biological phase Good capacitive effect

Pending Publication Date: 2021-08-13
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor mechanical properties and poor hydrophobicity of water-based polyurethane membranes, the invention provides a preparation method of nano-silica / hydroxysilane coupling agent composite modified polyurethane superhydrophobic membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing a nano-silica / hydroxysilane coupling agent composite modified polyurethane superhydrophobic membrane, comprising the following steps;

[0022] (1) Preparation of nano silica modified by silane coupling agent:

[0023] Nano-Si0 2 Mix with toluene at a mass ratio of 3:20, and disperse for 30 minutes with an ultrasonic cleaner at room temperature to obtain a uniform suspension. Then press the silane coupling agent KH-560 and nano-Si0 2 Mass ratio 5:3 ultrasonic mixing 5minmin. React for 6h-8h in a thermostat at 90°C. The reaction solution was centrifuged at room temperature at 1200r / min to obtain modified nano-SiO 2 , then ultrasonically centrifuged 6 times, and vacuum dried for 8 hours to obtain a white powder;

[0024] (2) Preparation of waterborne polyurethane prepolymer:

[0025] In a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add polyol, diisocyanate, and catalyst (organotin) in a mass ratio of 70:30:...

Embodiment 2

[0034] A method for preparing a nano-silica / hydroxysilane coupling agent composite modified polyurethane superhydrophobic membrane, comprising the following steps;

[0035] (1) Preparation of nano silica modified by silane coupling agent:

[0036] Mix nano-Si02 and toluene according to the mass ratio of 3:25, and disperse with an ultrasonic cleaner for 35 minutes at room temperature to obtain a uniform suspension. Then press the silane coupling agent KH-560 and nano-Si0 2 Mass ratio 6:11 ultrasonic mixing 8min. React in a 95°C constant temperature bath for 7h. The reaction solution was centrifuged at room temperature at 1300r / min to obtain modified nano-SiO 2 , then ultrasonically centrifuged 7 times, and vacuum-dried for 9 hours to obtain a white powder;

[0037] (2) Preparation of waterborne polyurethane prepolymer:

[0038]In a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add polyol, diisocyanate, and catalyst (organotin) in a mass ...

Embodiment 3

[0045] A method for preparing a nano-silica / hydroxysilane coupling agent composite modified polyurethane superhydrophobic membrane, comprising the following steps;

[0046] (1) Preparation of nano silica modified by silane coupling agent:

[0047] Mix nano-SiO2 and toluene according to the mass ratio of 5:34, and disperse for 40 minutes with an ultrasonic cleaner at room temperature to obtain a uniform suspension. Then press the silane coupling agent KH-560 and nano-Si0 2 The mass ratio is 6.5:13 and ultrasonically mixed for 10 minutes. React in a constant temperature bath at 100°C for 8h. The reaction solution was centrifuged at room temperature at 1500r / min to obtain modified nano-SiO 2 , then ultrasonically centrifuged 10 times, and vacuum-dried for 10 hours to obtain a white powder;

[0048] (2) Preparation of waterborne polyurethane prepolymer:

[0049] In a three-neck flask equipped with a stirrer, a thermometer and a reflux condenser, add polyol, diisocyanate, and ...

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Abstract

The invention discloses a preparation method of a nano-silica / hydroxysilane coupling agent composite modified polyurethane super-hydrophobic membrane. The nano-silica / hydroxysilane coupling agent composite modified polyurethane super-hydrophobic membrane is prepared from the following main raw materials: polyol, isocyanate, a catalyst, a hydrophilic chain extender, a neutralizer, a micromolecule chain extender, a silane coupling agent, nano-silica, deionized water and a post-chain extender. According to the invention, a synthesized polyurethane system is modified by introducing nano silicon dioxide particles modified by a hydroxyl silane coupling agent. A hydroxyl group of the hydroxyl silane coupling agent can chemically react with an isocyanate group of a waterborne polyurethane system, and silane is introduced to modify the hydrophobicity of the polyurethane membrane from the chemical aspect. The hydrophobicity of the polyurethane membrane is modified from the physical aspect by a micro-nano structure formed after the membrane is formed by the nano silicon dioxide particles treated by the hydroxyl silane coupling agent. The water contact angle of the prepared polyurethane super-hydrophobic membrane can reach 145-155 degrees, the rolling angle is 5-7 degrees, and the application field of the polyurethane membrane is widened.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophobic polyurethane film. Background technique [0002] The development of high-strength polyurethane materials is a direction that society attaches great importance to. CN105418870A discloses an acrylic compound modified water-based polyurethane emulsion and its preparation method. Water-based polyurethane is modified by polyhydroxy acrylic resin, but a large amount of it uses organic Solvents will cause immeasurable harm to human body and environment. The invention adopts the method of not adding an organic solvent and uses water as a dispersion medium to prepare a high-strength polyurethane film, which has the characteristics of natural environmental protection, degradability, wide application range and the like. The post-chain extender introduced in the experiment can undergo nucleophilic addition reaction with isocyanate to prepare polyurethane materials, which can not only reduce the r...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L75/08C08K9/06C08K3/36C08G18/10C08G18/66C08G18/48C08G18/34
CPCC08J5/18C08G18/10C08G18/4854C08G18/6692C08J2375/08C08K2201/011C08K9/06C08K3/36
Inventor 任秀艳朱琳高光辉张恩波姚传莹
Owner CHANGCHUN UNIV OF TECH
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