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Preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid

A polyurethane acrylate and acrylate technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of insignificant improvement of coating surface mechanical properties, lack of interaction, cumbersome modification process, etc., to achieve easy reaction The effect of control, simple process, and large range of emulsion particle size

Inactive Publication Date: 2012-04-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above preparation methods, the fumed silica needs to be modified, and the modification process is cumbersome. In addition, the fumed silica used is of micron scale rather than nanoscale.
"Colloid Polymer Science" (ColloidPolym Sci 2006, 284, 1067) introduces the physical blending of water-based silica sol and photocurable water-based polyurethane acrylate dispersion to improve the mechanical properties of the coating surface such as hardness, etc., but because only Simple physical blending of nano-silica sol and water-based urethane acrylate system, lack of sufficient interaction between inorganic nano-silica and organic urethane acrylate, it is easy to agglomerate nano-silica, so that the coating The improvement of the surface mechanical properties of the

Method used

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  • Preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid
  • Preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid
  • Preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This example is a control example without silica sol modification.

[0031] Add 38.0 g of isophorone diisocyanate (IPDI) into a 250 mL four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, and add 46.7 g of polyethylene glycol that has been dehydrated through molecular sieves dropwise with a dropping funnel while stirring at room temperature. For the mixed solution of diol PEG400 and 0.05g catalyst dibutyltin dilaurate (DBTDL), the dropping speed is controlled within 1.5h. After the dropwise addition, react at 45±5°C for 1-2h, then raise the temperature to 60°C until the measured NCO group reaches the theoretical value (measured by di-n-butylamine back titration), and NCO-terminated polyurethane prepolymer I is obtained.

[0032] Add 5.16 g of pre-dried dimethylol propionic acid (DMPA) powder into polyurethane prepolymer I in three batches, and react at 65±5° C. During the reaction, add an appropriate amount of acetone to adjust the viscosity...

Embodiment 2

[0036] Add 25.7g of isophorone diisocyanate (IPDI) into a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add molten 59.1g of PEG1000 and 0.05g of catalyst dropwise with a dropping funnel while stirring at room temperature For the mixed solution of stannous octoate, the dropping speed is controlled within 1.5h. After the dropwise addition, react at 45±5°C for 1-2h, then raise the temperature to 60°C until the measured NCO group reaches the theoretical value (measured by di-n-butylamine back titration), and NCO-terminated polyurethane prepolymer I is obtained.

[0037]Add 5.69g of dried dimethylolbutyric acid (DMBA) into the polyurethane prepolymer I in three batches, react at 65±5°C, and add an appropriate amount of acetone during the reaction to adjust the viscosity of the system. The degree of reaction was measured by di-n-butylamine back titration method, and the prepolymer II containing hydrophilic groups was obtained after reachi...

Embodiment 3

[0041] Add 32.2g of 2,4-toluene diisocyanate (TDI) into a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 52.5g of polystyrene dehydrated through molecular sieves dropwise with a dropping funnel while stirring at room temperature. For the mixed solution of propylene glycol PPG400 and 0.05g catalyst triethylamine, the dropping rate is controlled within 1.5h. After the dropwise addition, react at 45±5°C for 1-2h, then raise the temperature to 60°C until the measured NCO group reaches the theoretical value (measured by di-n-butylamine back titration), and NCO-terminated polyurethane prepolymer I is obtained.

[0042] Add 5.16 g of dried dimethylol propionic acid (DMPA) powder into polyurethane prepolymer I in three batches, and react at 65±5° C. During the reaction, add an appropriate amount of acetone to adjust the viscosity of the system. The degree of reaction was measured by di-n-butylamine back titration method, and the prepolym...

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Abstract

A preparation method of ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid belongs to the technical field of ultraviolet cured aqueous paint. The preparation method of the invention comprises: mainly using diisocyanate compounds, polyether polyol, polyhydroxycarboxylic acid and hydroxyl acrylate monomer as main raw materials to prepare a urethane acrylate prepolymer through an acetone process; adding amine compounds and water for salt formation and emulsification, introducing aqueous silicon dioxide sol in the emulsification process to obtain the ultraviolet cured silica sol modified aqueous urethane acrylate dispersoid. The invention introduces the aqueous nanometer-sized silicon dioxide in situ in the synthesis of the aqueous urethane acrylate dispersoid to obtain the silica sol modified aqueous urethane acrylate dispersoid. The introduction of the inorganic nanometer-sized silicon dioxide obviously improves the mechanical property of a light-cured coating. The dispersoid can be widely applied to the surface coating field of woodware, metal and plastic rubber and the like with high scratch resistance and wearing resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane resin modified by inorganic nano-silica particles for a novel water-based coating, and mainly relates to a preparation method of a green and environment-friendly UV-curable silica sol-modified water-based polyurethane acrylate dispersion. 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 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 applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/72C09D175/16C08K3/36C09D7/12C08G18/67C09D175/08C08J3/03C08G18/48C08G18/10C08G18/34C08G18/66
Inventor 张胜文陈宁姜思思沈利亚刘仁江金强刘晓亚
Owner JIANGNAN UNIV
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