A kind of preparation method of high scrub resistance water-based paint

Abstract

The invention discloses a preparation method of high-scrub-resistant water-based paint, which comprises the following steps of: carrying out hydrophilic emulsion treatment on a pigment (titanium dioxide, lithopone or charlton white) in advance, adding a surfactant and a stabilizer into the pigment, so that the pigment achieves a 2000-5000-mesh dispersed state, and preparing the pigment into a concentrated pigment paste for later use; in the process of formal emulsion paint production, deducting corresponding components (including the pigment, water and aids) of the pigment paste when raw materials are added in the process of slurrying, then, after the process of slurrying is completed, directly adding the prepared pigment paste, and after the pigment paste is dispersed, turning to a paint mixing process, so that the pigment is easy to be uniformly dispersed in a paint system. According to the invention, through the improvement on the existing coating process, under the condition that the compositions of raw materials are not changed, a pigment pretreatment process is added, so that the number of high-scrub-resistant times and covering capacity of the emulsion paint are improved, and under the condition of reaching same technical indexes of products, the application amount of the pigment can be correspondingly reduced, and the reduced cost is reduced by 5-10%.

Description

technical field [0001] The invention relates to the technical field of architectural coatings, in particular to a preparation method of a highly scrub-resistant water-based coating. Background technique [0002] The current production process of latex paint is to mix the four major components of latex paint: water, pigments and fillers, base materials, and additives according to a certain proportion of their respective raw material components, through mixing→emulsification→painting→filtering→(or toning) )→packaging and other processes to make different grades of latex paint. [0003] After research, it is found that the above-mentioned production process has the problem of low pigment use efficiency and is an extensive processing method: [0004] The reason is that only when the pigment is processed into a fineness of 2000 mesh to 5000 mesh and its surface area per unit weight is increased, can its opaque covering effect be better exerted. However, the current process is t...

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Problems solved by technology

[0003] After research, it is found that the above-mentioned production process has the problem of low pigment use efficiency and is an extensive processing method:

However, the current process is to put the pigment (titanium dioxide, lithopone 2000 mesh to 5000 mesh) and the filler (1000 mesh to 800 mesh or so) together in a certain proportion and disperse and emulsify it through a disperser and a sand mill. The maximum degree of dispersion, most of the particles are in agglomerated state, and the best use effect is not achieved. Since the particle size of the pigment is the same as that of the filler, it cannot be wrapped, which will lead to a decrease in hiding power, and the gaps between the fillers will not be filled with pigment particles, resulting in After the latex paint is dried, the particle gradation of the paint film layer is unreasonable and not dense enough, which directly leads to the easy entry of water into the paint film and reduces the scrub resistance of the paint.

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