Compound preparation method of latex paint with low titanium white and high contrast ratio

Abstract

A compound preparation method of a latex paint with low titanium white and high contrast ratio relates to a preparation method directly applicable to paints for building wall surfaces, and the method comprises the following steps: mixing titanium white powder with water and stirring the mixture; adding a dispersant and a wetting agent; putting the slurry into a mulser for emulsification, and detecting the particle size to be 0.2-0.5 microns; adding a pH adjusting agent to allow the pH to be 7-9; adding a polyurethane thickening agent and an alkali-swelling dispensing agent (to increase the viscosity and realize a stable storage) so as to prepare a titanium white slurry for later use; and adding emulsion paint special powder and an auxiliary agent into the prepared slurry to prepare the emulsion paint. According to the invention, the titanium white power is decreased by 40% under the condition that the same contrast ratio is reached, so the cost of the emulsion paint is reduced about 10-20%; in addition, the paint film is easier to adhere; the painting area is increased; the storage is more stable; and the times for rinsing resistance is also improved.

Description

Technical field: [0001] The invention relates to a preparation method directly applied to building wall paint, in particular to an improved preparation method of water-based environment-friendly paint. Background technique: [0002] The commonly used formulations and preparation methods of latex paints on the market are as follows: [0003] In parts by weight: [0004] Titanium dioxide: 175 [0005] Calcium silicate: 20 [0006] Hydroxyethylcellulose: 29.6 [0007] Sodium hexametaphosphate: 200 [0008] Auxiliary: more than 30 mixed grinding [0009] [0010] Diethyl alcohol monobutyl ether: below 20, add and mix in sequence [0011] Water: 138.6 [0012] Ammonia: 2 [0013] Preservatives: 0.4 [0014] The above formula and preparation method are from: Table 3-47 on page 334 of "Complete Manual of Production Formula Optimization Design and Production Technology Quality Inspection Standards of Latex Paint and Ecological Lat...

AI Technical Summary

Problems solved by technology

The contrast ratio of the existing latex paint mainly comes from the content of titanium dioxide. The higher the content, the better the contrast ratio. The principle is that the relative hiding power of titanium dioxide is: rutile type: 100; anatase type 78 (see latex paint and ecological latex paint Production formula optimization design and production technology quality inspection standard manual 141 pages), in the pulping stage of the current production process, only pigments (titanium dioxide, lithopone, etc.) and fillers such as calcium carbonate are mixed together to make paint slurry , when the paint is mixed, the titanium dioxide cannot be restored to the original particle state (the original particle state of titanium dioxide is 0.2-0.5 microns, and other fillers are 10-50 microns), most of them are still in the state of agglomeration and cannot be expanded in the paint film Its maximum surface area cannot be evenly distributed. Only by restoring the titanium dioxide particles of 0.2-0.5 microns to the original particles and uniformly distributed in the latex paint system can it exert its maximum covering ability