CZ307621B6 - Two-component organic putty for construction - Google Patents

Abstract

The two-part epoxy-based organic putty consists of component A and component B in a weight ratio of 100: 10 to 100: 100 by weight. Component A consists of 32 to 60 wt. % epoxy resin, 8 to 10 wt. % ground limestone, 25 to 40 wt. % silica, 2 to 5 wt. % titanium dioxide, 4 to 10 wt. % benzyl alcohol and 1 to 3 wt. % of carbon nanofibers and component B consists of 34 to 64 wt. % aliphatic amine, 11 to 17 wt. % balotiny, 21 to 46 wt. % talc and 4 to 9 wt. vinyl acetate.

Description

Technical field

The invention relates to an organic sealant intended for filling joints and cavities in buildings.

BACKGROUND OF THE INVENTION

Since the end of the 1950s, mass construction of prefabricated houses has been carried out using prefabricated technology. Already during their design, the lifetime was limited. And indeed, the construction of prefabricated houses quite quickly deteriorate. Over time, volume changes in the building envelope. These cause stresses in the edge regions of the panels and thus their deformation. Serious defects - material crumbling - occur especially in the additional concrete filling of the chambers in which the steel reinforcements of adjacent panels are welded together. Cracks also form in the joints between the panels, especially in the areas adjacent to these chambers. Air flows through the cracks and the moisture contained in it condenses on the loose reinforcement. It corrodes, reducing its ability to transmit tensile forces. Even worse conditions arise when the chambers in which the reinforcements come together were not concreted at all. Corrosion of the reinforcement at the interconnection of the panels and cracks in the joints gradually deteriorate the statics of the building and at the same time the thermal resistance of its outer shell decreases. In some prefabricated houses, the reinforcement joints even break completely. This can lead to deflection of the outer shell panels.

At present, methods are being developed that would at least slow down this development and extend the life of prefabricated houses. It is proposed, for example, to withdraw a building with steel rods, whether guided inside or outside the building. The disadvantages of these known methods are the high cost and the laboriousness of the rods located inside the building, or the disruption of the appearance of the building in the case of external rods.

CZ 294888 proposes a method of restoring the statics of prefabricated houses, the principle of which is to drill into the chambers in which the steel reinforcement of adjacent panels is interconnected by at least one channel through which the solidified organic solidified under pressure is introduced into the chamber. sealing compound, which is allowed to cure in the chamber. The organic sealant primarily surrounds the loose reinforcement and insulates it against water vapor. It creates a compact filling in the chamber together with the crumbled concrete and also penetrates into adjacent joints between the panels.

A number of cement and organic potting compounds are used for watering cavities and joints in buildings. E.g. CN 103059788 discloses a modified potting epoxy resin comprised of component A and curing agent B in a weight ratio of 100: 3 to 100: 15. Component A consists of the following components: 1.0 to 8.0% by weight, diluents, e.g., dibutyl ether alcohol, 25.0 to 39.0% by weight, silica nanofibrous filler, 0.5 to 4.5% by weight, hardener, 0.08 to 0.45% by weight, binder and 0.08 to 0.045% by weight, pigment, e.g. T102, the remainder to 100% by weight of which is a graphene-modified epoxy resin. The curing agent is diethylenetriamine or triethylenetetramine.

A disadvantage of known fillers is that, although they achieve the required strength parameters for a given purpose, they do not ensure perfect filling of the cavities, or they do not show the required mechanical properties in the long term with sufficient flowability.

The object of the invention is to propose a sealant for the construction industry which would substantially reduce the disadvantages of the known potting compounds, while the inorganic constituents contained therein would have a positive effect on the cost of its production.

- 1 GB 307621 B6

SUMMARY OF THE INVENTION

The object of the present invention is to provide a two-component organic epoxy resin sealant which consists of component A component B in a weight ratio of 100: 10 to 100: 100 relative to one another, wherein component A consists of 32 to 60% by weight of the composition. % of epoxy resin, 8 to 10 wt.%, ground limestone, 25 to 40 wt. % silica, 2 to 5 wt.%, titanium dioxide, 4 to 10 wt. % benzyl alcohol and 1 to 3 wt. % of carbon nanofibres and wherein component B consists of 34 to 64 wt. % aliphatic amine, 11 to 17 wt. % ballotin, 21 to 46 wt. % talc and 4 to 9 wt. vinyl acetate. The weight ratio of both components in the mixture is determined by the type of resin in component A and the type of amine in component B.

DETAILED DESCRIPTION OF THE INVENTION

In testing various mixtures with ingredients in the range indicated, the following composition has proven to be the best:

Component A:

% wt. % epoxy resin wt. % ground limestone wt. % silica; % titanium dioxide wt. % benzyl alcohol wt. nanofibers

Component B:

% wt. % aliphatic amine wt. % ballotins wt. talc% wt. vinyl acetate

Component A was mixed with component B in a weight ratio of 100:40.

The technological production process is carried out on a line which includes containers with automatic scales for powdered raw materials, containers with pumps for liquid materials and mixing equipment of appropriate capacity. The powdered fillers are first mixed and then the epoxy resin is poured from the respective container. After a specified mixing time, the sealant component A is prepared. Similarly, component B is prepared, the main component of which is an aliphatic amine.

In the experimental application of the sealant according to the invention, in the residential panel houses consisting of panels of the SG 60 and T 08 B type according to the preserved panel documentation, the floor areas where the panel joints are located were marked. Two channels were drilled into these chambers with a hammer drill. One of the channels was pushed into a conical nozzle of the injection device, which pressurizes the components of the two-component epoxy sealant, and under a pressure of 0.15 MPa liquid liquid was introduced into the channel until it started to exit the other channel in semi-solid state. In this way, all joints in the floor were treated. Given that in many cases larger volumes are involved, it is economically advantageous that an inorganic filler - small aggregate - is added to the organic cement.

Claims (4)

A two-component organic epoxy resin sealant comprising component A and component B in a weight ratio of 100: 10 to 100: 100 relative to each other, wherein component A consists of 32 to 60 wt. % epoxy resin, 8 to 10 wt. % ground limestone, 25 to 40 wt. % silica, 2 to 5 wt. % titanium dioxide, 4 to 10 wt. % benzyl alcohol and 1 to 3 wt. carbon component nanofibers and wherein the component B consists of 34 to 64 wt. % aliphatic amine, 11 to 17 wt. % ballotin, 21 to 46 wt. % talc and 4 to 9 wt. vinyl acetate. A two-component organic sealant according to claim 1, characterized in that component A consists of 46 wt. epoxy resins 9 wt. ground limestone 32 wt. silica 3 wt. titanium dioxide 7 wt. benzyl alcohol 3 wt. nanofibers, component B consists of 47 wt. aliphatic amine 14 wt. ballotins 32 wt. talc 7 wt. % of vinyl acetate, wherein component A is mixed with component B in a weight ratio of 100:40.