CS262092B1 - Flexible building material with acoustic effect - Google Patents

Abstract

For the construction of floors and sealing of joints between elements of panel structures with acoustic effects, a mass consisting of 38.7 to 74 % by weight of an aqueous suspension of a rubber polymer (the viscosity of which is adjusted by adding a thickener of starch or cellulose type in an amount of 0.3 to 6 % by weight) and 20 to 60 % by weight of loose rubber filler with a granulometry of 0.001 to 10 mm is proposed. The production is simple, the mass, when used, saves complex work operations and in this way it is possible to advantageously utilize difficult waste of crushed rubber.

Description

The invention relates to a flexible building material with acoustic effect, for example serving as a filling material in joints separating the building structure, as a material forming an acoustic backing in heavy acoustic floors and the like.

In the construction of prefabricated elements, the use of building materials or plastoelastic elements having the ability to be compressed and adjacent to the contact surfaces of the prefabricated elements to form a sealed joint with acoustically insulating effect is required in some structural details of joints. Sealing rubber profiles or strands are most often used for this purpose. Their size and shape must be different for each shape and dimension of the sealed joint.

In the construction of heavy floating or semi-flexible floors, a layer of fibrous mineral or glass mats, which are covered with waterproofing asphalt board, is used as acoustic underlay to increase the impact sound insulation. The spreading layer of the concrete screed is then applied to this layer. This layer may be replaced by a layer of a self-leveling flooring composition which, due to its highly plasticized nature, has a liquid consistency. As a result, however, the liquid concrete mixture is forced through the joints between the asphalt strips into the acoustic underlay with the consequent formation of acoustic bridges, thereby degrading the acoustic floor construction.

For this purpose, an asphaltolatex-based plastoelastic binder or a thermoplastic polymer binder (AO 232 488) has been proposed. However, these mixtures are extremely complicated (usually containing 6 to 8 components), do not allow ambulatory production at the construction site and, after formation, have irreversible deformation and high dynamic stiffness resulting from binder character and supplementary reinforcing fillers such as sand, ground limestone, expanded perlite etc.

These disadvantages are overcome by the acoustically resilient building material according to the invention, which comprises 39.7 to 74% by weight. aqueous dispersions of a rubber polymer such as butadiene-styrene, chloroprene and the like, having a dry weight of 15 to 55 wt.%, the viscosity of which is adjusted by the addition of 0.3 to 6 wt. thickeners of the fast-dissolving or swelling type, starch or cellulose derivatives (usually ether-bonded) or a combination thereof, and 20 to 60 wt. of a loose rubber filler with a granulometry of 0.001 to 10 mm. The filler may be crushed scrap rubber or tire retreading waste. The consistency of the resulting mass can be adjusted by adding water according to the purpose of use.

The advantage of the material according to the invention is the reduction in the number of manufacturing operations and the saving of raw materials while achieving a comparable or even better effect and the utilization of hitherto difficult to recover waste such as crushed rubber mass. The production and use of the mass is shown in the following examples.

Example 1

Consistency of an aqueous dispersion of butadiene styrene polymer with a dry weight of 20 wt. and an amount of 59.4 wt. percent was adjusted by the addition of 0.47 wt. % fast-dissolving potato starch and 0.13 wt. % swelling wheat starch.

The dispersion thus prepared was mixed with crushed waste rubber of granulometry up to 4 mm in an amount of 40% by weight on a construction site in a conventional drum mixer. ® / o. The resulting material was used for acoustic filling of joints of thin concrete partitions. In this way, two operations were avoided: gluing the microporous rubber gasket and leveling the surface under a thin layer of silicate mortar.

Example 2

The mass of the following composition was produced centrally:

Crushed rubber mass up to 10 m in size and 43.75 wt. % chloroprene latex with dry matter

% By weight 55.50 wt. % hydroxyethylcellulose 0.75 wt. %

The resulting material was transported to the construction site in transport packaging, where it was spread on the ceiling structure at a thickness of 15 mm and pulled along the walls to the level of the future floor. After this technological break, a self-leveling floor concrete mixture with a thickness of approx. 50 mra was poured onto this layer. The acoustic underlay created in this way replaced three operations: leveling the base with a cement screed, laying the mineral mat as an acoustic underlay, and then waterproofing by laying a layer of asphalt board.

The composition according to the invention can be used in all areas of the construction industry, particularly in the assembly of panel buildings and floor structures with acoustic effects. At the same time, hardly recoverable waste, ie crushed rubber, is used as a raw material.

Claims (1)

An elastic building material with an acoustic effect based on a loose rubber filler, characterized in that it contains 39.7 to 74% by weight of the composition. an aqueous suspension of a rubbery polymer having a dry weight of 15 to 55% by weight, such as butadiene-styrene, chloroprene and the like, whose viscosity is adjusted by the addition of 0.3 to 6% by weight. BACKGROUND OF THE INVENTION Thickeners of the type of rapidly soluble or swellable starches, starch derivatives or cellulose, usually with an ether bond or a combination thereof, and 20 to 60 wt. bulk rubber filler with a granulometry of 0.001 to 10 mm, such as crushed rubber.