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 inv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Method for preparing nano-silica / hydroxysilica coupling agent composite modified polyurethane superheater film, including the following steps;

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

[0023] Nano Si0 2 The toluene was mixed with toluene by mass ratio of 3:20, and the ultrasonic cleaning instrument was dispersed at room temperature for 30 min to obtain a uniform suspension. Press the silane coupling agent KH-560 to press with nano Si0 2 Quality ratio 5: 3 ultrasound mixed for 5MINMIN. The reaction was reacted for 6H-8 h at a temperature of 90 ° C. Reaction liquid at normal temperature 1200R / min centrifugation separation results in modified nano SiO 2 Ultrasound and then centrifuged 6 times, vacuum drying 8H to get a white powder;

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

[0025] In a three-neck bottle equipped with a stirrer, a thermometer, and a reflux, a polyol, a diisocyanate, a catalyst (organic tin...

Example Embodiment

[0033] Example 2

[0034] Method for preparing nano-silica / hydroxysilica coupling agent composite modified polyurethane superheater film, including the following steps;

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

[0036] Nano Si02 and toluene were mixed in a mass ratio of 3:25, and the ultrasonic cleaning instrument was dispersed with an ultrasonic cleaning instrument at room temperature to a uniform suspension. Press the silane coupling agent KH-560 to press with nano Si0 2 The mass is more than 6:11 ultrasound. The reaction was reacted at a temperature of 95 ° C for 7 h. Reaction liquid at normal temperature 1300R / min centrifugation to give a modified nanometer SiO 2 , Then centrifuate again, 7h, dry 9H, dry 9 h;

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

[0038]In a three-neck bottle equipped with a stirrer, a thermometer, and a reflux condenser, a polyol, diisocyanate, catalyst (organic tin) is added to 80: 40: 3, and after addi...

Example Embodiment

[0044] Example 3

[0045] Method for preparing nano-silica / hydroxysilica coupling agent composite modified polyurethane superheater film, including the following steps;

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

[0047] Nano Si02 and toluene were mixed in mass ratio of 5:34, and 40 min was dispersed with an ultrasonic cleaning instrument at room temperature to obtain uniform suspension. Press the silane coupling agent KH-560 to press with nano Si0 2 The mass ratio is 6.5: 13 ultrasound mixed for 10 min. The reaction was reacted at a temperature of 100 ° C for 8 h. Reaction liquid at normal temperature of 1500R / min Centrifugation is separated by modified nanometer SiO 2 , Then centrifugally 10 times, vacuum drying 10H, white powder;

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

[0049] In a three-neck bottle equipped with a stirrer, a thermometer, and a reflow tube, a polyol, diisocyanate, catalyst (organic tin) is added in mass than 9...

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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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