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Preparation method of nano-silicon-dioxide-modified water-based polyurethane

A technology of nano-silica and water-based polyurethane, which is applied in the modification of water-based polyurethane and the preparation of nano-silica sol modified by silane coupling agent, which can solve the problems of difficulty and less water-based polyurethane modification, and achieve good adhesion Hardness, easy industrialization effect

Inactive Publication Date: 2016-09-28
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current blending method is to modify, grind, ultrasonically disperse or combine several methods of nano-silica powder, and then introduce it into water-based polyurethane by mechanical stirring, but it must be fully achieved in the polymer matrix. Nano-scale dispersion is very difficult; nano-silica sol is a dispersion of silica particles in water or solvents, which can be freely compatible with emulsions such as acrylate and vinyl acetate, but it is relatively seldom used for water-based polyurethane modification

Method used

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  • Preparation method of nano-silicon-dioxide-modified water-based polyurethane
  • Preparation method of nano-silicon-dioxide-modified water-based polyurethane

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preparation example Construction

[0037] A kind of preparation method of nano silicon dioxide modified waterborne polyurethane of the present invention, comprises the steps:

[0038] (1) Add macromolecular polyols into the reaction flask, distill under reduced pressure at 100°C for 30-60 minutes until the water content is lower than 0.5%, cool down to 60°C, add polyisocyanate and catalyst, and heat up to 70-90°C for reaction 2 -4 hours;

[0039](2) Cool down to 60°C, add a small molecule alcohol chain extender and a small molecule hydrophilic chain extender, raise the temperature to 70-90°C and react for 2-4 hours until the NCO content reaches the theoretical value;

[0040] (3) Lower the temperature to 40-60° C., reduce the viscosity with a solvent, add a salt-forming agent, and react for 15-30 minutes to obtain a prepolymer of water-based polyurethane.

[0041] (4) Nano-silica sol modified by silane coupling agent: Dilute the nano-silica sol with a small amount of isopropanol, then mix it with silane coupli...

Embodiment 1

[0055] A preparation method for nano silicon dioxide modified water-based polyurethane, comprising the steps of:

[0056] (1) Add 40 g of polyethylene adipate with a molecular weight of 1000 into the reaction flask, distill under reduced pressure at 100°C for 30 minutes, cool down to 60°C, add 20g of toluene diisocyanate, 0.2g of dibutyltin dilaurate, and heat up React at 70°C for 4 hours;

[0057] (2) Cool down to 60°C, add 2g of 1,4-butanediol and 2g of 2,2-dimethylolpropionic acid, raise the temperature to 70°C and react for 4 hours until the NCO content reaches the theoretical value;

[0058] (3) cooling to 40° C., and after reducing the viscosity with 10 g of acetone, add 2 g of triethylamine, and react for 30 minutes to obtain a prepolymer of water-based polyurethane;

[0059] (4) 20g of nano-silica sol was diluted with 10g of isopropanol, then mixed with 10g of methyltrimethoxysilane, stirred and reacted at room temperature for 30 minutes, to obtain nano-silica sol mod...

Embodiment 2

[0062] A preparation method for nano silicon dioxide modified water-based polyurethane, comprising the steps of:

[0063] (1) Add 60g of polytetrahydrofuran diol with a molecular weight of 2000 into the reaction flask, distill under reduced pressure at 100°C for 30 minutes, cool down to 60°C, add 40g of hexamethylene diisocyanate and 0.5g of stannous octoate, and heat up to 90°C React for 2 hours;

[0064] (2) Cool down to 60°C, add 5g of diethylene glycol and 8g of 2,2-dimethylolbutyric acid, raise the temperature to 90°C and react for 2 hours until the NCO content reaches the theoretical value;

[0065] (3) cooling to 60° C., and after reducing the viscosity with 20 g of butanone, add 5 g of ammonia water and react for 15 minutes to obtain a prepolymer of water-based polyurethane;

[0066] (4) Dilute 80g of nano-silica sol with 20g of isopropanol, then mix it with 40gKH560, stir and react at room temperature for 30 minutes, to obtain nano-silica sol modified by silane coupl...

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Abstract

The invention discloses a preparation method of nano-silicon-dioxide-modified water-based polyurethane. The method comprises the following steps: (1) preparing a water-based polyurethane prepolymer by a conventional process; (2) silane-coupling-agent-modified nano silica sol: diluting nano silica sol with a small amount of isopropanol, mixing with a silane coupling agent, and stirring to react at normal temperature for 30 minutes, thereby obtaining the silane-coupling-agent-modified nano silica sol; and (3) adding the water-based polyurethane prepolymer obtained in the step (1) into the silane-coupling-agent-modified nano silica sol obtained in the step (2), adding deionized water and a small-molecule amine chain extender, carrying out high-speed shear emulsification and dispersion at normal temperature for 15-30 minutes, and carrying out reduced pressure distillation to remove the solvent, thereby obtaining the nano-silicon-dioxide-modified water-based polyurethane. The film formed by the resin prepared by the method has excellent hardness, adhesion, impact resistance, water resistance, aging resistance, solvent scrubbing resistance, acid resistance, saline water resistance, wear resistance and the like.

Description

technical field [0001] The invention relates to a preparation method of nano silicon dioxide modified water-based polyurethane, in particular to the preparation of a silane coupling agent modified nano-silica sol and the modification of the water-based polyurethane. Background technique [0002] Water-based polyurethane is a polyurethane system that uses water instead of organic solvents as the dispersion medium. Compared with traditional solvent-based polyurethanes, water-based polyurethanes are non-toxic, non-flammable, and environmentally friendly, and the structure-performance of water-based polyurethanes can be adjusted. It has both the properties of elastomer and plastic, as well as excellent wear resistance and adhesion, etc. It is widely used in leather / synthetic leather finishing agents, fabric coating and finishing agents, coatings, adhesives, paper surface treatment agents and fiber surfaces Treatment agents and other fields have broad market prospects. However, ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08G18/34C08G18/12C08K9/06C08K3/36
CPCC08G18/12C08G18/4238C08G18/4825C08G18/4854C08G18/664C08G18/6659C08G18/6674C08G18/6692C08K3/36C08K9/06C08K2201/011C08G18/3228C08G18/324C08G18/3243
Inventor 钱涛刘海龙郎伟敏刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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