38results about How to "Improve water whitening resistance" patented technology

The invention discloses a synthetic method of a transparent water-whitening resistant polyacrylate emulsion. The synthetic method is as follows: uniformly mixing an emulsifier, a soft monomer, a hard monomer and a functional monomer to obtain a monomer mixed liquor containing the emulsifier; adding deionized water in a reactor, heating to a preset temperature, adding 30wt%-50wt% of an initiator, stirring for 5min, dropping the monomer mixed liquor, dropping for 2-5h; after the monomer mixed liquor is added for 30min, dropping the rest of the initiator, dropping for 2-5h, controlling the reaction temperature to be 70-90 DEG C, keeping warm for 0.5-1 h; cooling to 60 DEG C, adding tert-butyl hydroperoxide and sodium formaldehyde sulfoxylate, continuing to react for 0.5h, cooling to 45 DEG C, and adding ammonium hydroxide for adjusting the pH value to be 6-8. According to the synthetic method, a monomer pre-emulsification step is omitted in an emulsion polymerization process, the operation is simpler, the energy consumption is reduced, the work efficiency is improved, and at the same time, the emulsion has excellent performances and a good water-whitening resistant characteristic.

The invention relates to a sand-in-water coating and a preparation method thereof. The raw material of the sand-in-water coating includes a dispersed phase and a continuous phase; the dispersed phase includes the following components in weight percentage: 0.5%-1% of the first protective rubber powder; 20%-30% of pure acrylic emulsion; hollow microspheres 0.4%-0.7%; the first alkali swelling thickener 0.1%-0.5%; quartz sand 25%-35%; the first auxiliary agent 3%-10%; water 25%-40%; the continuous phase includes the following Components in weight percent: the second protective rubber powder 2%-4%; silicone acrylic emulsion 30%-50%; the second alkali swelling thickener 0.3%-0.6%; the second additive 3%-10%; water 50%-65%; the specific gravity of the dispersed phase is 1g / ml-1.06g / ml; the viscosity of the continuous phase is 40ku-55ku. The sand-in-water coating is prepared using a two-phase system, and the specific gravity of the dispersed phase is light. During the production, granulation, mixing, and storage of finished products, the color point is in a suspended state, and sedimentation is not easy to occur. The product has low viscosity, good color point separation effect, high production efficiency, good water whitening resistance and stable viscosity.

The invention discloses a water white resistant stone-like coating which is prepared from the following components: water-based acrylic emulsion, a film forming auxiliary, a defoaming agent, cellulose ether, color sand, silicon sol, corn hydroxypropyl starch and modified calcined clay. The stone-like coating disclosed by the invention is high in film forming property and cannot crack; under conditions of low temperature (4 to 6 DEG C) and high humidity (70 to 80 percent), the stone-like coating has outstanding advantages that the coating can be dried after being constructed within a short period of time (1.5 hours) and is not whitened in water.