Nano hollow silica dioxide micro-sphere/polyurethane composite aqueous paint and preparation method thereof

A water-based coating, silica technology, applied in the direction of polyurea/polyurethane coatings, coatings, latex paints, etc., can solve the problems affecting the performance of water-based composite coatings, poor suspension stability and rheology, and many reaction steps. Maintain stable sedimentation phenomenon, no sedimentation phenomenon, improvement of hardness and water resistance

Inactive Publication Date: 2008-08-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nano-silica emulsion uses 5-15% surfactant, which will inevitably seriously affect the performance of the water-based composite coating, and the reaction steps are many, the cost is high, and the application is limited.
Chinese patent CN101007911A has reported another kind of water-based paint and its manufacture method, and silicon dioxide can reach 10-18% of the total weight of water-based paint in this emulsion, and the product has adopted very trace dispersant (<0.1%), effectively avoids The impact of high additive content on product performance, but the suspension stability and

Method used

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  • Nano hollow silica dioxide micro-sphere/polyurethane composite aqueous paint and preparation method thereof
  • Nano hollow silica dioxide micro-sphere/polyurethane composite aqueous paint and preparation method thereof
  • Nano hollow silica dioxide micro-sphere/polyurethane composite aqueous paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 1.5g of polyvinylpyrrolidone in 5g of hot water and add it to a 250mL four-neck flask equipped with a thermometer, condenser, stirrer, and nitrogen gas. Dissolve 0.39g of azobisisobutylamidine hydrochloride and 3g of Distilled styrene was added after ultrasonic dispersion, heated to 70°C after nitrogen gas for 60 minutes, and kept stirring for 24 hours to obtain PS emulsion, which was dialyzed through a dialysis bag for 12 hours before use. The above 5g PS emulsion and 40mL ethanol were stirred for 30min under nitrogen protection, and the temperature was raised to 50°C. Add 15mL of ammonia water into the flask, stir for 5-10min, then quickly add 2g of tetraethyl orthosilicate to react for 3-5h, centrifuge the prepared emulsion, wash with ethanol and deionized water for 3 times, and obtain the hollow SiO 2 Microspheres.

[0028] The prepared 2.5g hollow SiO with hydroxyl groups on the inner and outer surfaces 2 Microspheres, 1.0g of silane coupling agent KH-5...

Embodiment 2

[0032] Same as Example 1, but with isocyanate-terminated polyurethane prepolymer, nano-hollow SiO with amine groups 2 The ratio of microspheres, dibutyltin dilaurate and acetone from 100:1:1:100 was changed to 100:2:1:100.

[0033] The coating film properties of nano hollow silica microspheres / polyurethane composite water-based coatings are shown in Table 1, and the particle size distribution is shown in figure 1 As shown, its thermal performance and UV-visible light transmittance are shown in image 3 and Figure 4 .

Embodiment 3

[0035] Same as Example 1, but with isocyanate-terminated polyurethane prepolymer, nano-hollow SiO with amine groups 2 The ratio of microspheres, dibutyltin dilaurate and acetone from 100:1:1:100 was changed to 100:3:1:100.

[0036] The film properties of nano hollow silica microspheres / polyurethane composite water-based coatings are shown in Table 1, and their thermal properties and UV-visible light transmittance are shown in Table 1, respectively. image 3 and Figure 4 .

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Abstract

The invention belongs to the technical filed of water paint, which particularly relates to nanometer hollow silica sphere/polyurethane compound water paint and the process for preparation thereof. The water compound paint is chemically compounded by hollow SiO2 sphere, whose dimension is 50-250 nanometers, isocyanate terminated polyurethane prepolymer, catalyst and other auxiliary agents. Indoor temperature storage stability of the compound water paint is excellent, nanometer hollow SiO2 sphere and water polyurethane have excellent compatibility, hardness and compatibility of the water compound coating layer are greatly improved, and fire-resisting property and ultraviolet resistant performance are excellent. The process for preparation of the invention has the advantages of convenient and simple technique, high film coating quality, low production cost and extensive application prospect and the like, which has no pollution to environment, the water paint is a new generation environmental-friendly high-performance chemical product, which can be applied in the fields such as automobile coating, wood coating, construction, office furniture, leather, textile finishing, pigment printing and mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of water-based paint preparation technology, and in particular relates to a nano hollow silica microsphere / polyurethane composite water-based paint and a preparation method thereof. Background technique [0002] Because water-based polyurethane uses water as the dispersion medium, it not only has some important performance characteristics of solvent-based polyurethane, but also has the advantages of low volatile organic compounds, non-toxic, non-flammable, non-polluting, energy-saving, safe and reliable, etc., so in recent years to develop rapidly. However, the waterborne polyurethane coating films currently prepared need to be further developed in terms of water resistance, solvent resistance and physical and mechanical properties. In order to improve and enhance the comprehensive performance of waterborne polyurethane coatings and expand its application range, it is necessary to carry out compound modific...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/02C08G18/76C08G18/42C08G18/10C08K9/06C08K7/26
Inventor 杨正龙秦深周光斌浦鸿汀袁俊杰
Owner TONGJI UNIV
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