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Nanometer titanium dioxide/acrylate polymer composite emulsion and preparation method thereof

A technology of nano-titanium dioxide and acrylate, which is applied in the field of nano-titanium dioxide/acrylate polymer composite emulsion and its preparation, can solve the problems of low coating rate of composite emulsion nano-titanium dioxide, affecting the performance of latex film, complex nucleation mechanism, etc., to achieve Improved compatibility, guaranteed stability, and excellent dispersibility

Inactive Publication Date: 2015-10-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent adopts the method of emulsion polymerization. The nucleation mechanism in the polymerization process is complicated. Three nucleation modes of micelle nucleation, monomer droplet nucleation and homogeneous nucleation coexist, and the prepared composite emulsion has a low coating rate of nano-titanium dioxide.
[0005] Chinese invention patent CN103073669A uses inverse microemulsion method-in-situ emulsion polymerization to prepare nano-titanium dioxide / acrylate polymer composite emulsion. Although this method can effectively reduce the agglomeration of nano-titanium dioxide, it requires a large amount of emulsifier and takes a long time Cleaning and removal, otherwise it will affect the performance of the latex film

Method used

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  • Nanometer titanium dioxide/acrylate polymer composite emulsion and preparation method thereof
  • Nanometer titanium dioxide/acrylate polymer composite emulsion and preparation method thereof
  • Nanometer titanium dioxide/acrylate polymer composite emulsion and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In terms of parts by mass, its raw materials include the following components:

[0037] Modified nano titanium dioxide 3.2 parts

[0038] Acrylate monomer methyl methacrylate 40 parts

[0039] Co-emulsifier hexadecane 1.8 parts

[0040] Emulsifier Sodium Lauryl Sulfate and Tween 80 1.8 parts

[0041] Initiator potassium persulfate 0.4 part

[0042] 80 parts of deionized water

[0043] Prepare nano-titanium dioxide / acrylate polymer composite emulsion as follows:

[0044] (1) Preparation of modified nano titanium dioxide

[0045] In terms of parts by mass, mix 3.2 parts of nano-titanium dioxide with 150 parts of isopropanol, disperse with 400W ultrasonic for 20 minutes, add 1.2 parts of vinyltrimethoxysilane, react at 70°C for 3.5h, centrifuge, wash with absolute ethanol, and centrifuge 1. Washing was repeated 3 times, and baked at 50° C. for 24 hours to obtain modified nano-titanium dioxide.

[0046](2) Preparation of Nano Titanium Dioxide / Acrylic Ester Polymer Co...

Embodiment 2

[0049] In terms of parts by mass, its raw materials include the following components:

[0050] Modified Nano Titanium Dioxide 5

[0051] Acrylic monomer acrylamide and butyl acrylate 50 parts

[0052] Co-emulsifier cetyl alcohol 2 parts

[0053] Emulsifier sodium oleate and Tween 80 2 parts

[0054] Initiator ammonium persulfate 0.5

[0055] Deionized water 80

[0056] Prepare nano-titanium dioxide / acrylate polymer composite emulsion as follows:

[0057] (1) Preparation of modified nano titanium dioxide

[0058] In terms of parts by mass, mix 5 parts of nano-titanium dioxide with 200 parts of ethanol, 800W ultrasonic dispersion for 35 minutes, add 5 parts of vinyltriethoxysilane, react at 80°C for 6 hours, centrifuge, wash with absolute ethanol, centrifuge and wash Repeat 3 times, and bake at 100° C. for 12 hours to obtain modified nano-titanium dioxide.

[0059] (2) Preparation of Nano Titanium Dioxide / Acrylic Ester Polymer Composite Emulsion

[0060] In terms of part...

Embodiment 3

[0062] In terms of parts by mass, its raw materials include the following components:

[0063] Modified Nano Titanium Dioxide 2.25

[0064] Acrylic monomers acrylate, tert-butyl methacrylate and acrylic acid 35 parts

[0065] Co-emulsifier n-pentanol 1.25 parts

[0066] Emulsifier sodium oleate 1.25 parts

[0067] Initiator hydrogen peroxide 0.3 part

[0068] Deionized water 70

[0069] Prepare nano-titanium dioxide / acrylate polymer composite emulsion as follows:

[0070] (1) Preparation of modified nano titanium dioxide

[0071] In terms of parts by mass, mix 2.25 parts of nano-titanium dioxide with 110 parts of methanol, 600W ultrasonic dispersion for 10 minutes, add 2.25 parts of γ-methacryloxypropyltrimethoxysilane, react at 60°C for 3.5h, centrifuge, and use Washing with absolute ethanol, centrifugation and washing were repeated 3 times, and drying at 75° C. for 18 hours to obtain modified nano titanium dioxide.

[0072] (2) Preparation of Nano Titanium Dioxide / Acr...

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Abstract

The invention discloses a nanometer titanium dioxide / acrylate polymer composite emulsion and a preparation method thereof. The preparation method comprises: modifying nanometer titanium dioxide with a silane coupling agent; dispersing modified nanometer titanium dioxide into a liquid mixed from a monomer and a co-emulsifier; performing ultrasonic dispersion; adding the obtained liquid into an emulsifier aqueous solution; performing stirring; performing secondary ultrasonic dispersion; transferring the obtained liquid to a four-neck flask; elevating the temperate to 60-80 DEG C; adding an initiator; and performing heat preservation for 2-6 h to obtain the nanometer titanium dioxide / acrylate polymer composite emulsion. The nanometer titanium dioxide / acrylate polymer composite emulsion is of an emulsion particle structure, which is a core-shell structure by taking nanometer titanium dioxide as a core, and taking an acrylate polymer as a shell. The nanometer composite emulsion is good in storage stability; nanometer titanium dioxide is excellent in dispersibility and high in coating ratio in the acrylate polymer; and the nanometer composite emulsion is applicable to functional paint, such as ultraviolet-proof paint, self-cleaning paint, and anti-bacteria paint.

Description

technical field [0001] The invention relates to the technical field of nanometer composite emulsion, in particular to a nanometer titanium dioxide / acrylate polymer composite emulsion and a preparation method thereof. Background technique [0002] Acrylate polymer emulsions are widely used in the fields of coatings and adhesives due to their good adhesion, film-forming properties, and scrub resistance. However, they have disadvantages such as low hardness, poor heat resistance, and poor weather resistance. To a certain extent, its application is limited. Nano-titanium dioxide not only has small size effect, surface interface effect, quantum size effect and macroscopic quantum tunneling effect, but also has excellent anti-ultraviolet performance and photocatalytic effect. Now there have been many studies on the combination of nano-titanium dioxide and acrylate polymer emulsion. The hardness, heat resistance and weather resistance of the acrylate polymer emulsion are improved,...

Claims

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Application Information

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IPC IPC(8): C08F120/14C08F220/56C08F220/18C08F220/10C08F220/06C08F220/14C08F2/26C08F2/30C08F2/44C08K9/06C08K3/22
Inventor 张心亚汪春玲
Owner SOUTH CHINA UNIV OF TECH
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