Organosilicon modified acrylate emulsion for ambient temperature crosslinked aqueous paint and method for preparing same
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An ambient temperature, acrylate technology, applied in the field of chemical coatings, can solve the problems of freeze-thaw stability, calcium ion stability and insufficient storage stability
Active Publication Date: 2005-09-14
扬州华滋生态建设有限公司
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At present, silicone acrylic emulsion still has some deficiencies in some propert
Method used
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Embodiment 1
[0057] Example 1: Silicone-modified acrylate emulsion modified by inorganic nanoparticles
[0058] The preparation method is as follows:
[0059] (1) Synthesis of silicone prepolymer:
[0060] 400 kg of isopropanol and 8.4 kg of dry potassium hydroxide were added to the reactor, heated to reflux, and 350 kg of isopropanol was distilled off. Then add 148 kilograms of octamethylcyclotetrasiloxane (D 4 ), react at 100-120°C for 120 minutes, then cool down to 70-80°C, add 10 kg of glacial acetic acid, stir for 60 minutes, then vacuumize to remove small molecules, filter, and remove potassium acetate to obtain silicone prepolymer Object A. spare.
[0061] (2), add 70 kg of tetraethyl orthosilicate to the reaction kettle, add dropwise 6 kg of deionized water and 0.2 kg of glacial acetic acid, and react at 90°C for 60 minutes, then use a water pump to remove the residual water and ice in the system. Acetic acid and a small amount of ethanol, then add organosilicon prepolymer A, ...
Embodiment 2
[0068] Embodiment 2, is identical with the technique of embodiment 1, and raw material composition is basically the same, but following change is arranged:
[0069] Formulation unit: kg
[0070]
Embodiment 3
[0071] Embodiment 3, the process is identical with embodiment 1, and raw material composition is basically the same, but following change is arranged:
[0072] Formulation unit: kg
[0073]
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Abstract
This invention is an organic silicon modification acrylic acid ester emulsion that used to environment temperature crosslinking water craft coating. The feature is that it is made by the following way, organosilicon prepolymer is synthesized first, then it is reacted with tetra ethyl ortho silicate, silicon dioxide nanometer particle of modifying surface is synthesized by sol-gel technique. Seed emulsion got by seed emulsion concentrical technique is core, compound consisted by nonsaturated organosilicon monomer, hard monomer, soft monomer and function monomer, and the silicon dioxide nanometer particle said above is shell, then anorganic nanometer particle modified silicon abicin emulsion is got through nucleocapsid trough polymer network polyreaction. The preparing method includes following procedures (1) synthesis of organic silicon prepolymer. (2) Preparing of silicon dioxide nanometer particle. (3) Preparing of seed emulsion. (4) Synthesis of silicon abicin emulsion, then this product is got. Abrasion resistant quality, alkali resistance, water resistance, weather resistance, soiling resistance of the product after film forming is greatly improved.
Description
technical field [0001] The invention belongs to the field of chemical coatings, and in particular relates to a silicone-modified acrylate emulsion for ambient temperature crosslinking water-based coatings and a preparation method of the emulsion. The emulsion of the present invention is mainly used for the emulsion of high-performance and environment-friendly coatings such as high-grade building exterior wall coatings, water-based wood coatings, waterproof coatings, metal alloy plate decoration coatings, and water-based adhesives. Background technique [0002] At present, the emulsion (film-forming substance), one of the main components of exterior wall latex paint, is mostly styrene-acrylic emulsion and pure acrylic emulsion. However, the molecular thermoplasticity of these emulsions is limited, and the linear molecules lack cross-linking points, so it is difficult to form a three-dimensional cross-linked network structure. Therefore, they are prone to stickiness and sticky...
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