BG65019B1 - Heat insulation building material - Google Patents

Abstract

The material is used in laying heat insulation plasters over concrete, brickwork and stonework masonry, in building floor heating and for making prefabricated building panels in the forms of slabs orblocks. It improves the heat insulation capability in comparison with the known material based on pearlite with cement and lime as binders. The mortar produced from the said material is elastic, softand can easily be applied on the base without any loss of material. The heat insulation building material comprises pearlite, cement and additionally includes re-dispersible powder polymer and cellulose ether, in the following ratio of the components, in wt.%: ground pearlite of 0-0.5 grain size distribution from 57 to 60, cement from 37 to 40, re-dispersible powder polymer from 2 to 3 and cellulose ether 0.2-0.3.

Description

Technical field

The invention relates to thermal insulation building material, which is used for laying thermal insulation plasters on concrete, brick and stone masonry, when installing underfloor heating, as well as for the construction of structural elements for buildings and structures in the form of slabs or blocks.

BACKGROUND OF THE INVENTION

Special and patent literature discloses thermal insulation materials based on perlite, which contain binders such as cement, gypsum, kaolin, bitumen, resins, water glass. They have a relatively low adaptability, in that they are not sufficiently elastic and harder to apply to the substrate.

A composition of pearlitic concrete BG 50549 is known, which is used as a heat and sound insulation material, with a composition (in wt.%): Portland cement 15 to 45, perlite 10 to 40, sodium or calcium carbonate 0.5 to 4, 0, a foaming agent consisting of 30% active substance and 70% water, in an amount of from 1.0 to 4.0, water from 20 to 72 and optionally sodium nitrite from 0.5 to 2.0. This material has a relatively low thermal insulation capacity and is not sufficiently elastic.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a heat-insulating building material with a lower coefficient of thermal conductivity, high elasticity of the solution, providing easier application to the substrate, and a better appearance of the plaster after curing.

The heat-insulating building material includes perlite and cement, according to the invention additionally contains polymer and cellulose ether at the following ratio of components (wt.%): Ground perlite with dimensions ΟΟ, 5 mm from 57 to 60, cement from 37 to 40, redispersible polymer. dust from 2 to 3 and cellulose ether from 0.2 to 0.3.

The redispersible powder polymer used is vinyl acetate-ethylene based. When mixed with water, it forms a stable dispersion and, after redispersion, acts again as a binder. The dispersible powder additive increases the ability of the heat-insulating material solution to retain water and stabilizes the solution as an additional binder of perlite particles. The polymer powder makes the solution more elastic, which makes it easier to apply and also increases the strength, wear resistance of the material and its adhesion to the substrate.

Cellulose ether also helps to retain water in solution, makes the mixture "puffy" and "greasy", prolongs the processing time (open time), which facilitates its application to the substrate, as well as increases adhesion to the substrate and resistance to slip of the material after application.

The advantages of the heat-insulating building material according to the invention are expressed in the following: the material has a higher thermal insulation ability than the known perlite-based material with cement and lime binders; The solution made from the material is elastic and soft and is easily applied to the substrate without loss of material.

Examples of carrying out the invention

Example 1. A dry building mix with composition (wt.%) Was obtained: pearlite - 60, cement PT 45 K - 37.8, powder polymer -2 and cellulose ether - 0.2.

The dry mixture is obtained by dosing the starting components and mixing until complete homogenization. To obtain a solution, 150 l of water was added to 100 kg of dry mixture. The mixture can be applied as an internal or external plaster with a thickness of 20 - 40 mm. Different building elements can be made from it.

Characteristics of the solidified solution:

- tensile strength 1,0 MPa (BDS EN 196-1);

- compressive strength of 1,2 MPa (BDS EN 196-1);

- adhesion to the base (brick) 0.20 MPa (DIN 18555-6);

- bulk density of the cured plaster after drying to a constant mass of 400 kg / m ³ (DIN 18555-3);

- coefficient of thermal conductivity (at t _cp > 25 ° C) 0,098 W / m ° K (BDS 16632-87). 5

EXAMPLE 2 A dry building mix with composition (wt.%) Was obtained: perlite - 58, cement PT 35 D 20 - 39.8, a redispersible powder polymer based on vinyl acetate-ethylene - 2 and cellulose ether - 0.2.

The dry mixture and solution were prepared and used as in Example 1.

Characteristics of the solidified solution:

- compressive strength of 1.7 MPa (BDS 5771-85);

- adhesion to the base (brick) 0.30 MPa (DIN 18555-6);

- volume density of the cured plaster after drying to a constant mass of 410 kg / m ³ (DIN 18555-3);

- coefficient of thermal conductivity (at t _cp > 25 ° C) 0,100 W / m ° K (BDS 16632-87).

Claims (2)

Claims 1. Thermal insulation building material comprising perlite and cement, characterized in that it contains an additional redispersible polymer of powder and cellulose ether at the following ratio of components (wt.%): Milled perlite with dimensions 0-0.5 mm from 57 to 60, cement from 37 to 40, redispersible powder polymer from 2 to 3 and cellulose ether from 0.2 to 0.3. Thermal insulation building material according to claim 1, characterized in that the redispersible polymer is based on vinyl acetate-ethylene.