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Waterborne polycarbonate modified silica sol composite coating and preparation method thereof
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A polycarbonate and composite coating technology, applied in polycarbonate coatings, antifouling/underwater coatings, coatings, etc., can solve the problems of poor water resistance, poor mechanical properties of paint films, low hardness, etc., and achieve excellent comprehensive performance , good dispersion effect, uniform distribution effect
Active Publication Date: 2019-05-21
SHENZHEN UNIV
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Coupled with its rich source of raw materials and relatively low cost, it also has many other excellent properties, such as a larger specific surface area, a higher dispersion of the adsorption solution, and it also has stain resistance, However, when silica sol is used alone, cracks, internal micropores, poor stability, and poor mechanical properties of the paint film usually appear in the film at room temperature.
Therefore, silica sol is generally modified to use it as a film-forming substance of coatings. However, the existing modified silica sol water-based coatings still have the following deficiencies: first, poor water resistance; second, poor film-forming properties , high brittleness; third, low hardness
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[0028] The preparation method of water-based polycarbonate modified silica sol composite coating includes the following steps:
[0029] 1) Ingredients: accurately weigh each material according to the formula, and add 60% of the total amount of deionized water, deionized water, film forming aids, wetting agent, and pH to the dispersion tank at 0-50°C. Adjuster, dispersant, first defoamer, first thickener, to obtain the initial mixture;
[0030] 2) Pre-mixing: Stir the initial mixture obtained in step 1) at 400-600r / min for 20-25min to make the additives uniformly dispersed;
[0031] 3) Grinding and dispersion: Increase the speed to 1300-1500r / min, add rutiletitanium dioxide, talcum powder, heavy calciumcarbonate, and calcined kaolin successively, and continue to stir for 20-25min to make the material fineness less than 50um;
[0032] 4) Paint mixing: Add the remaining deionized water dropwise, reduce the speed to 400-600r / min, stir, add polycarbonate modified silica sol, and then add...
Embodiment 1
[0036] The waterborne polycarbonate modified silica sol composite coating includes the following components in terms of mass percentage: 30% polycarbonate modified silica sol, 0.1% organic silicon additives, 0.3% dispersant, and 6.82% rutiletitanium dioxide, Talc 4.55%, heavy calciumcarbonate 11.36%, calcined kaolin 1.56%, film forming aid 1%, wetting agent 0.8%, first thickener 0.4%, second thickener 0.6%, first defoamer Agent 0.75%, second defoamer 0.75%, antifreeze 1%, anti-mold bactericide 1%, and the balance is deionized water.
Embodiment 2
[0038] The waterborne polycarbonate modified silica sol composite coating includes the following components in terms of mass percentage: 30% polycarbonate modified silica sol, 0.1% organic silicon additives, 0.3% dispersant, and 6.82% rutile titanium dioxide, Talc 5.45%, heavy calcium carbonate 14.89%, calcined kaolin 2.38%, film forming aid 0.1%, wetting agent 0.05%, first thickener 0.008%, second thickener 0.012%, first defoamer Agent 0.05%, second defoamer 0.05%, antifreeze agent 0.05%, anti-mold bactericide 0.02%, and the balance is deionized water.
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Abstract
The invention particularly relates to a water-based polycarbonate-modified silica sol composite paint and a preparation method thereof, belonging to the technical field of paints. The composite paint comprises the following components: a polycarbonate-modified silica sol, an organic silicon aid, a dispersing agent, rutiletitanium white, talcum powder, ground calciumcarbonate, calcined kaolin, a film forming aid, a wetting agent, a first thickener, a second thickener, a first defoaming agent, a second defoaming agent, an antifreezing agent, a mildewproof bactericide and the balance of deionized water. The water-based polycarbonate-modified silica sol composite paint has excellent comprehensive properties: the hardness of the coating can reach 7H, the adhesive force of the coating is Grade 01, the scrub resistance exceeds 12000 times, and the pollution resistance is 7.9%. Meanwhile, the coating of the water-based polycarbonate-modified silica sol composite paint has the advantages of uniform surface arrangement and smooth surface, and all the components have favorable dispersion effects and basically do not have the phenomenon of aggregation.
Description
Technical field [0001] The invention belongs to the technical field of coatings, and specifically relates to a water-based polycarbonate modified silica sol composite coating and a preparation method thereof. Background technique [0002] The rapid development of science and technology and the increase in productivity have greatly improved the quality of human material life. At the same time, people's requirements for material life and the environment have become higher and higher. Countries around the world have begun to pay attention to environmental protection issues. The number of countries and regions participating in the World Environmental Protection Organization is constantly increasing. Environmental protection is now the top priority for all countries. The coating industry is a relatively special raw material-intensive industry. Many organic coatings use raw materials that harm human bodies and the environment in their manufacturing. Many harmful gases and waste water ...
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