Preparation method for coating titanium dioxide by utilizing polymer hollow microspheres
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A technology of titanium dioxide and surface coating, which is applied in the field of preparation of polymer hollow microspheres, can solve the problems of high pollution, small rigid modulus, collapse, etc., and achieve the effects of safe preparation process, improved environmental protection, and easy operation
Active Publication Date: 2014-03-05
SKSHU PAINT
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However, the titanium dioxide industry is a high energy-consuming and high-pollution industry, especially in China, most of the sulfuric acid method is used to prepare titanium dioxide, which greatly destroys the ecological environment and energy demand.
Although ordinary hollow microspheres can play a certain role in covering dry films, they are not very helpful for covering wet films. collapse
The paint film produced in this way is prone to sudden changes in gloss, so hollow microspheres cannot be added to the paint by more than 8%, and only a small part of it can replace titanium dioxide
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[0040] A preparation method of polymer hollow microspheres synthesized with styrene and methyl methacrylate as monomers and coated with titanium dioxide by the sol-gel method, the specific steps are as follows:
[0041] (1) First, the polymer core is synthesized by emulsion polymerization, then the polymer intermediate is formed by seed polymerization on the polymer core, and finally the polymer shell is formed by seed polymerization on the intermediate, and then hollow microspheres are formed by alkali treatment.
[0042] The polymer hollow microspheres include a polymer shell, an intermediate, a polymer core and a titanium dioxide coating layer. The specific composition ratio and preparation method are as follows:
[0043] 1. Production of polymer core:
[0044] Methyl methacrylate 10-12%
[0045] Methacrylic acid 6-8%
[0046] Butyl ester 10-12%
[0047] Ethylene glycol dimethacrylate 0.1-0.3%
[0048] Sodium dodecyl sulfonate 0.002-0.004%
[0049] Ammonium persulfate 0.2-0.5%
[0050] Wa...
Embodiment 2
[0068] The main components and weight ratios of the second embodiment are as follows:
[0069] Methyl methacrylate 11%
[0070] Methacrylic acid 7%
[0071] Butyl ester 10%
[0072] Ethylene glycol dimethacrylate 0.2%
[0073] Sodium dodecyl sulfonate 0.003%
[0074] Ammonium persulfate 0.4%
[0075] Water 71.397%
Embodiment 3
[0076] The main components and weight ratios of the third embodiment are as follows:
[0077] Methyl methacrylate 11%
[0078] Methacrylic acid 7%
[0079] Butyl ester 12%
[0080] Ethylene glycol dimethacrylate 0.25%
[0081] Sodium dodecyl sulfonate 0.003%
[0082] Ammonium persulfate 0.35%
[0083] Water 69.397%
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Abstract
The invention relates to a preparation method which is characterized by taking styrene and acrylics as monomers to synthesize a hollow polymer to coat titanium dioxide by a sol-gel method. The preparation method comprises the following steps: firstly synthesizing a polymer core through emulsion polymerization, then forming a polymer intermediate on the polymer core through seeding polymerization, finally forming a polymer shell layer on the intermediate through seeding polymerization, and then forming hollow microspheres through alkali treatment; and coating inorganic mineral matters such as titanium dioxide and the like by the sol-gel method on the basis of the hollow microspheres. The method has the following beneficial effects: organic solvent dissolution, strong acid and alkali etching or high-temperature calcination is not needed to remove a hollow microsphere template, so the method is safe in preparation processes and is simple and convenient to operate; the hollow microspheres formed by different chemical components can be obtained by changing the raw materials of the core and the shell; and the application of the hollow microspheres in different occasions can be improved by modification of different inorganic mineral matters.
Description
Technical field [0001] The invention relates to a preparation method of polymer hollow microspheres, in particular, the hollow microspheres can be used to coat various inorganic minerals on the surface to form a uniform and stable emulsion system. Background technique [0002] At present, the coating industry is inseparable from the demand for titanium dioxide. To improve the wet film hiding power and dry film hiding power of the coating, it is necessary to add pigments and fillers with high refractive index, and the general mineral shading coefficient is mostly 1.4-1.7 In the meantime, an effective cover cannot be formed. At present, the most effective is titanium dioxide with a refractive index of 2.7. However, the titanium dioxide industry is an industry with high energy consumption and high pollution. In particular, most of the domestic use of sulfuric acid method to prepare titanium dioxide is a great damage to the ecological environment and energy demand. Although the ord...
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