Polymer hollow microspheres, preparation method thereof and preparation method for coating inorganic mineral matters by utilizing polymer hollow microspheres
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A polymer and microsphere technology, 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: 2012-01-11
SKSHU PAINT
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Problems solved by technology
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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preparation example Construction
[0056] The preparation process of the above-mentioned polymer core is as follows: first add all water, ammonium persulfate accounting for 1 / 4 of the total amount and methyl methacrylate, methacrylic acid, butyl fat and ethylene glycol dimethacrylate accounting for 1 / 20 of the total amount Methacrylate, at 80 o Polymerize at C for 40 minutes, then drop the remaining 19 / 20 of methyl methacrylate, methacrylic acid, butyl fat, ethylene glycol dimethacrylate and the remaining 3 / 4 of ammonium persulfate. This process needs to be carried out at 80 oC for 4.5 hours, then warmed to 90 o C keeps this temperature for 30 minutes simultaneously, obtains the polymer core emulsion of synthesis;
[0057] The main components and weight ratio of its embodiment one are as follows:
[0058] Methyl methacrylate 10%
[0059] Methacrylic acid 6%
[0060] Butyl fat 11.398%
[0061] Ethylene glycol dimethacrylate 0.1%
[0062] Sodium dodecyl sulfonate 0.002%
[0063] Ammonium persulfate 0.5%
...
Embodiment 2
[0065] The main components and weight ratio of embodiment two are as follows:
[0066] Methyl methacrylate 11%
[0067] Methacrylic acid 7%
[0068] Butyl fat 10%
[0069] Ethylene glycol dimethacrylate 0.2%
[0070] Sodium dodecyl sulfonate 0.003%
[0071] Ammonium persulfate 0.4%
[0072] Water 71.397%
Embodiment 3
[0073] The main components and weight ratio of embodiment three are as follows:
[0074] Methyl methacrylate 11%
[0075] Methacrylic acid 7%
[0076] Butyl fat 12%
[0077] Ethylene glycol dimethacrylate 0.25%
[0078] Sodium dodecyl sulfonate 0.003%
[0079] Ammonium persulfate 0.35%
[0080] 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 various inorganic mineral matters 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 inorganic acid mineral salt or organo-siloxane 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 method for preparing polymer hollow microspheres, in particular, the hollow microspheres can be used to coat the surface of various inorganic minerals to form a uniform and stable emulsion system. Background technique [0002] At present, the paint industry is inseparable from the demand for titanium dioxide. To improve the wet film hiding power and dry film hiding power in the paint, it is necessary to add pigments and fillers with high refractive index, while the shading coefficient of ordinary minerals is mostly between 1.4-1.7. , unable to form an effective cover. At present, the most effective is titanium dioxide with a refractive index of 2.7. 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 damages the ecological environment and energy demand. Although ordinary hollow ...
Claims
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