Sand-in-water coating and preparation method thereof

Abstract

The invention relates to a sand-in-water coating and a preparation method thereof. Raw materials of the sand-in-water coating comprise a dispersion phase and a continuous phase; the dispersion phase involves, by weight, 0.5%-1% of first protection glue powder, 20%-30% of a pure acrylic emulsion, 0.4%-0.7% of hollow microspheres, 0.1%-0.5% of a first alkali swelling thickening agent, 25%-35% of quartz sand, 3%-10% of a first assistant and 25%-40% of water; the continuous phase involves, by weight, 2%-4% of second protection glue powder, 30%-50% of a silicone acrylic emulsion, 0.3%-0.6% of a second alkali swelling thickening agent, 3%-10% of a second assistant and 50%-65% of water; the proportion of the dispersion phase is 1 g / ml-1.06 g / ml; the viscosity of the continuous phase is 40 ku-55 ku. The sand-in-water coating prepared by adopting the two-phase system is low in proportion of the dispersion phase, in the processes of prilling production, mixing and storage of finished products, color points are in a suspension state, and the sedimentation phenomenon cannot easily occur. The viscosity of the coating is low, the color point separation effect is good, the production efficiency is high, the water-whitening resistance performance of the coating is good, and the viscosity is stable.

Description

technical field [0001] The invention relates to the field of chemical building coatings, in particular to sand-in-water coatings and a preparation method thereof. Background technique [0002] At present, sand-in-water coatings are basically prepared by a three-phase system method, and the three phases of the three-phase system refer to the dispersed phase, the granulated protective colloid solution, and the continuous phase. Three-phase system preparation process such as figure 1 As shown, generally: [0003] A. In the toning stage, according to the color of the stone, N colors are adjusted with dispersion additive color paste, also known as color points, such as color point ①, color point ②, color point N, etc. [0004] B. Granulation stage: Mix the color point with the granulation protective colloid solution in a certain proportion, and use screens of different specifications to granulate in special granulation equipment according to the effect of the stone, and obtain ...

AI Technical Summary

Problems solved by technology

[0008] First, a certain proportion of quartz sand will be added to the dispersed phase of sand-in-water to reflect the texture effect of natural marble bumps, but the specificity of quartz sand is large, and due to gravity, the dispersed phase is in the granulation protective colloid solution and the continuous phase Very easy to settle

[0009] Second, the viscosity of the granulated protective glue is low, and if the viscosity is low or non-viscous, the color point has a good separation effect during granulation, but the color point is very easy to sink to the bottom, so that the protective glue solution cannot completely cover the color point. Cause granulation to produce bleeding, color point breakage, color point swelling and other undesirable phenomena

[0010] Third, during the storage of sand in water, there will also be the problem of color point settlement

[0011] Fourth, the viscosity of the sand-in-water continuous phase is generally high, and the post-thickening is serious

[0013] However, the structure of bentonite and alkali-swellable thickener has strong water absorption, which may easily lead to poor water resistance and poor water resistance.

Moreover, increasing the viscosity of the granulation protective gel solution will increase the pulling force between the color dots, resulting in poor separation of the color dots, and in more serious cases, the color dots will be broken and granulation will not be possible.

In addition, the high-viscosity continuous phase requires a high speed or a long time to stir evenly. The production and mixing process will easily lead to smaller and broken color points, and it is difficult to achieve standard color effects.

At the same time, the higher the viscosity of the finished sand-in-water product, the slower the discharge speed under the same conditions, which reduces the construction efficiency and leads to an increase in construction costs

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