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polymer cement-based materials in the application of architectural coatings in the field of architectural coatings
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Liu Yi
(China Metallurgical Construction Group Research Institute, Beijing 100088)
HC coating Reuters: Abstract: The elastic emulsion type, PVC content and flexible acrylic emulsion and latex compound exterior wall paint ratio of elastic integrated performance.
Key words: elastic emulsion; architectural coatings; scrub resistance; stain resistance
0. Introduction
concrete surfaces of buildings, decorative features than paint In addition, should also have protection. At present in China, outside the building wall surface decoration before carrying out, most of the cement mortar surface is grass roots. However, due to the inherent characteristics of cement-based materials (materials are brittle, low tensile strength), when subject to temperature changes, alternating wet and dry, freeze-thaw cycles and other environmental factors,mac makeup, often they will crack if the surface of an ordinary wall paint decoration, is as the grass-roots and propagation of cracks can lead to coating cracking. As time and the accumulation of these destructive elements, cracks will further increase, enhance, or even a negative impact on the building damage. For example, when affected by water erosion, the water will penetrate the cracks and further penetrate the interior. Apart from the alternation of wet and dry so that further expansion of cracks, but also may lead to reinforcement corrosion in concrete, and even affect the use of the building function. Again, when subject to atmospheric carbon dioxide and other acid gases and other corrosive gases erosion,vibram 5 fingers, these corrosive gas will coat the internal corrosion of cement mortar and concrete production, concrete carbonation,vibram five fingers, may also affect the structure of the internal reinforcement. Thus, the building surface crack is considered to be building a common problem. To this end, in recent years during the surface coating coating, the use of a new type of functional coatings - exterior wall paint flexible. Practice has proved that: In addition to this functional coatings with the required decorative effect, but also cover the walls of the hairline cracks to prevent leakage and to prevent carbonation of concrete walls, so more and more users of all ages, expanding market share . The emulsion from the screen to start, guided by the theory in the PVC, through the various grades of acrylic emulsion and the emulsion mixed elastic, flexible developed high-performance exterior wall paint.
1. Experimental
1.1 experimental drugs
emulsion: BA-201, BA-205, East Petrochemical; AC-261P, 2438M, Solomon Haas; NaPoly2100, 4700, National Starch; pigments: Titanium Dioxide R-902, DuPont Company; calcined kaolin (1250 mesh), heavy calcium powder (800 mesh), Beijing Quo Albert; agent: propylene glycol antifreeze , multi-functional additives AMP-95, wetting agent X-405, Dow Chemical; thickener TE-936, AT-07, dispersing agent DP-01, East Petrochemical; coalescent TEXANOL ester, Iraq Eastman Chemical; defoamer F-111, ALEXF-250, Haichuan chemical.
1.2 equipment
SFJ-400 type of sand, dispersed, multi-purpose mixing machine, dual scraper fine Meter (0 ~ 25μm), JTX-based architectural coatings resistant to scrubbing device, Environmental Engineering Technology Co., Ltd Shanghai Modern; QXD type scraper small meter (0 ~ 50μm), Tianjin Instrument testing machine building company; FA2004 Electronic Analytical Balance, Shenyang Electronic Instrument Co., Ltd. Dragon; NDJ-5S rotary viscosity dollars, the Shanghai Balance Instrument Factory.
1.3 based formulation
based formulation in Table 1.
experimental basis in Table 1 formula (PVC30%)
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