DRY MIXTURES

[:ru]Сари М.[:en]Sari M.[:] [:ru]Hexion Specialty Chemicals[:en]Hexion Specialty Chemicals[:]

[:ru]Петер У.[:en]Peter U.[:] [:ru]Hexion Specialty Chemicals[:en]Hexion Specialty Chemicals[:]

[:ru]Бернар С.[:en]Bernard C.[:] [:ru]Hexion Specialty Chemicals[:en]Hexion Specialty Chemicals[:]

[:ru]Авис М.[:en]Avice M.[:] [:ru]Hexion Specialty Chemicals[:en]Hexion Specialty Chemicals[:]

[:ru]Коломб Ж.-Ф.[:] [:ru]Hexion Specialty Chemicals[:]

Alitinform №4-5 (11) 2009 г. 78-91 p.

Abstract

A large range of latex chemistries are used in omission construction material composites to improve their mechanical and chemical resistances. In applications such as ready-to-use mortars (1 & 2 K) for External Thermal Insulation Composite Systems (ETICS), the latex is quite a dominant component as compared with standard polymer modified composites, where the latex is used in smaller proportions (e. g. tile adhesives, grouts, plasters, etc.). In these systems, specific polymer related parameters appear critical. The physical characteristics such as the glass transition temperature (Tg) directly impact on the composite’s mechanical behaviour. Furthermore, the chemical resistance and intrinsic hydrophobicity of the polymer greatly influence the composite material’s performances and durability.

The present work deals with a lab study correlating the polymer’s Tg to the adhesion and deformability of cement-free or low cement containing composites.

We correlate the polymer’s degree of hydrophobicity to the composite materials’ water resistance. A comparison is made between three latex types: pure acrylic (PA), styrene acrylic (SA), and terpolymers of vinyl acetate, ethylene and vinyl chloride (Vac/E/VC).

Application performance examples — dealing with ETICS — are given, involving different latex containing pastes (with and without cement). The impact of the formulation is considered with a variation of the binder content («Polymer/Cement» ratio).