Foam concrete engineering, polymer LaTeX is often used for treatment of super light foamed concrete surface in order to improve the surface strength, foam concrete ductile and significantly reduce the effects of water absorption of foam concrete. Include water repellents in the foamed concrete can significantly improve the rate of water absorption of foam concrete, but some caused retarding foam concrete slurry emulsion, foaming of the early, resulting in problems such as subsidence and, therefore, should be implemented by means of compound admixture emulsion of hydrophobic capability.
In bubble concrete and supporting mortar in the, polymer once in material internal and surface into film, due to polymer molecular between force main for van der Waals force, in inorganic material surface, and gap in the formed polymer mesh structure, on inorganic material of cohesion, and modulus, and hydration degree, and stomatal distribution, and condensation time, and compressive strength, and anti-folding strength, and permeable rate, and heat sex, and resistance water resistance frozen sex, and acid alkaline, and size changes, and bond performance, and ion penetration, and resistance salt corrosion sex, and construction sex, and rheological sex, and deformation capacity, and anti-infiltration sex, and Crack resistance, oil resistance, dielectric properties, creep, impact resistance, and the use of materials and the cost of materials has a different degree of improvement or change. Due to the large differences of emulsion, the project should be based on need, reasonable selection of latex and corresponding additives.
The performance of polymer solid content, PH value and coagulum content, viscosity, stability, density, grain size, minimum film forming temperature and surface tension.
1, the solid content: solids content is a very important indicator, relating to calculation of the amount of polymer and water/cement ratio calculation. Method for the determination of non-volatile matter is usually called a certain quality of emulsion in a drying temperature to balance weight, calculated.
2, stability: stability refers to the emulsion of emulsion by mechanical, chemical, temperature change, when, without breaking the ability to gather, including mechanical characterization of emulsion stability, chemical stability and thermal stability.
3, minimum film forming temperature: emulsion of polymer particles have sufficient activity in mutual cohesion becomes a continuous film is defined as the lowest temperature minimum film forming temperature. Minimum film forming temperature of emulsion is not the same as the glass transition temperature of the polymer. In addition, the minimum film forming temperature and there is a certain correlation between the mechanical properties of polymer, film-forming temperature, high strength of polymers, polymer tougher performance.
4, size: emulsion polymer particle size can be used in optical microscopy, centrifugation, laser particle size analysis to determine. Usually show a certain distribution of particle diameter distribution can be 50~5000nm.
5, PH value: emulsion PH value varies according to the LaTeX variety, often used for styrene-butadiene rubber modified cement liquid PH value for 10~11, acrylic emulsion PH value for 7~9, ethyl acetate and its copolymer emulsion PH value is 4~6.
6, viscosity: viscosity characterization of liquid flow is a kind of indicator. The viscosity of polymer emulsion can be measured in different ways, among them, the common approach is to test with a rotational viscosity. Has some effect on viscosity of solids content, the same emulsion, higher solids content, the higher the viscosity.

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