Method for preparing siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion

A nano-silica, water-based polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor compatibility and easy agglomeration, and achieve the effects of inhibiting agglomeration, good repeatability, and easy reaction control.

Active Publication Date: 2014-09-24
RUNTAI CHEM TAIXING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification of polyurethane by organosiloxane can effectively enhance the interaction between polyurethane and nano-silica, solve the problems of easy agglomeration and poor compatibility of nano-silica in polyurethane dispersion, and significantly improve the photocurable latex coating film. Mechanical properties such as hardness, wear resistance

Method used

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  • Method for preparing siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion
  • Method for preparing siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion
  • Method for preparing siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0046] (1) Synthesis of dihydroxysiloxane

[0047] Under ice bath, add 30g (about 0.135mol) aminosilane coupling agent KH550 and 0.04g inhibitor BHT (2,6-di-tert-butyl-4-methylphenol) into a 250mL four-necked bottle, and then Add 31.2g (about 0.27 mol) hydroxyethyl acrylate (HEA) dropwise at a speed of 8s / d (about 0.27 mol), transfer it to an oil bath after dropping, control the reaction at 40°C for 6 hours, and extract with n-hexane after the reaction The resulting light yellow liquid is the required dihydroxysiloxane, which is poured into a brown bottle and sealed for storage.

[0048] (2), Synthesis of UV-curable polyurethane prepolymer modified by 5% dihydroxysiloxane:

[0049] Add 38.0g of diisocyanate (IPDI) into a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 41.97g of melted PEG400 and 0.05g of catalyst stannous octoate dropwise with a dropping funnel while stirring at room temperature The mixed solution, the dropping ...

Embodiment 3

[0054] (1) Synthesis of dihydroxysiloxane: same as Step 1 of Example 2.

[0055] (2), Synthesis of 10% bishydroxysiloxane modified UV-curable polyurethane prepolymer:

[0056] Add 38.0g of diisocyanate (IPDI) into a 250mL four-necked flask equipped with a stirrer, thermometer and reflux condenser, and add 37.2g of melted PEG400 and 0.05g of catalyst stannous octoate dropwise with a dropping funnel while stirring at room temperature The mixed solution, the dropping rate is controlled within 1.5h. After the dropwise addition, react at 45±5°C for 1-2h, then continue to dropwise add 10.59g of the previously synthesized dihydroxysiloxane, the dropping speed is controlled at 3s / d, and after the dropping is completed, the temperature is raised to 60°C for reaction until the determination of -NCO The group reaches the theoretical value (determined by di-n-butylamine back titration method), and the -NCO-terminated dihydroxysiloxane-modified polyurethane prepolymer I is obtained.

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Embodiment 4

[0061] (1) Synthesis of dihydroxysiloxane: same as Step 1 of Example 2.

[0062] (2) Synthesis of UV-curable polyurethane prepolymer modified with 15% dihydroxysiloxane:

[0063] Add 38.0g of diisocyanate (IPDI) into a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 32.36g of melted PEG400 and 0.05g of catalyst stannous octoate dropwise with a dropping funnel while stirring at room temperature The mixed solution, the dropping rate is controlled within 1.5h. After the dropwise addition, react at 45±5°C for 1-2h, then continue to add 15.96g of the previously synthesized dihydroxysiloxane dropwise, the dropping speed is controlled at 3s / d, and after the dropping is completed, the temperature is raised to 60°C for reaction until the determination of -NCO The group reaches the theoretical value (determined by di-n-butylamine back titration method), and the -NCO-terminated dihydroxysiloxane-modified polyurethane prepolymer I is obtaine...

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Abstract

The invention relates to a method for preparing a siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion, belonging to the technical field of ultraviolet curing aqueous paint. The method comprises the following steps of: synthesizing bishydroxy siloxane; preparing the bishydroxy siloxane with a diisocyanate compound, polyether glycol, polyhydroxy carboxylic acid and an unsaturated double bond acrylate monomer into an organic siloxane modified polyurethane prepolymer through an acetone method; and then adding an amine compound and water for salifying and emulsifying, meanwhile, in the processes, adding nano silicon dioxide to prepare the siloxane and nano silicon dioxide double modified ultraviolet curing aqueous polyurethane dispersion. Through the organic siloxane modified polyurethane, the interaction of the polyurethane with the nano silicon dioxide can be effectively enhanced, and the problems of easy agglomeration, poor compatibility, and the like of the nano silicon dioxide in the polyurethane dispersion are solved. The dispersion has good application prospect in the fields of surface coatings of high scratches, wear woodware, metal, plastic rubber, and the like.

Description

technical field [0001] The invention relates to a method for preparing a water-based polyurethane resin double-modified by organosiloxane and inorganic nano-silica for a new type of water-based paint, and mainly relates to a method for preparing a green and environment-friendly novel UV-curable paint. The invention belongs to the technical field of ultraviolet curing water-based paint. Background technique [0002] At present, water-based coatings have become the main direction of the development of environmentally friendly coatings, especially the technology of water-based ultraviolet (UV) curing coatings has attracted increasing attention because of its compliance with the concepts of high efficiency, environmental protection, energy saving, and clean production. In addition, water-based light-curing coatings combine many advantages of both traditional UV curing technology and water-based coating technology, and become a new coating technology with great development and ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/16C08K3/36C08G18/67C08G18/12C08G18/32C08G18/48C08J5/18C09D175/16
Inventor 张胜文姜思思吴茜刘仁白绘宇江金强刘晓亚
Owner RUNTAI CHEM TAIXING CO LTD
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