CS214315B1 - Fast-setting putty for bonding especially ceramic materials - Google Patents

Abstract

Fast-setting sealant for bonding, especially to ceramic materials. The purpose of using the sealant according to the invention is to ensure a 4-hour setting time without the need for maturation in steaming or heating chambers and also to level out the unevenness of the connected fittings. The sealant consists of 30 to 50 percent by weight of medium molecular epoxy resin, where the viscosity is adjusted by a plasticizer with a hardener and 25 to 70 percent by weight of cement. It also contains 1 to 40 percent by weight of filler.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a rapid-setting sealant for bonding, in particular, ceramic materials.

The joining of ceramic fittings in the panel or joining of the ceramic panels is currently carried out with mortars or concrete according to the classical method. The required strength, especially in the joints of fittings and components, is achieved in this classical procedure by steel reinforcement, when joining components by welding it. This classic so-called wet process requires relatively ^! 'lion time for maturing fasteners, or accelerating maturation using various additives, ni? via heating.

Among the more recent known methods are methods employing synthetic chemical macromolecular compounds for joining fittings and components. They are primarily epoxy, polyester and ester and acrylic adhesives. Their advantage lies in the fact that the setting time is considerably shorter) some of them do not require the presence of water for curing, thus allowing the parts to be joined even after. frost. On the other hand, they have some disadvantages, in particular low viscosity and thus easy volatility. As a result, the gap is only very weak, so that only calibrated fittings must be used for gluing. The unevenness of the surface of the fittings and the dimensional differences cannot be compensated for in such a small gap. The use of synthetic adhesives alone is also disadvantageous because of their high cost. Therefore, methods are known in which the resin is mine-filled; mineral fillers, for example, silica with a large specific surface area, ground feldspar, fired ceramic ground, ground glass and the like.

For the widest application, a sealant having a setting time of approximately 4 hours is required; without the need of maturing in steaming or heating chambers, and must be of such a consistency that it can be used in larger layers in the joint to compensate for unevenness and dimensional variation of the fittings to be joined.

These conditions are met and the above-mentioned drawbacks are eliminated by the quick-setting putty for bonding in particular ceramic materials according to the invention, which consists of 30 to 45 weight percent of a medium molecular epoxy resin characterized by a viscosity of 250 to 700 P at 25 ° C; to 385, an ecox / 100g epoxy group in the range of 0.26 to 0.32, and a chlorine content of 0.2 to 0.32. 0.5% based on diphenylpropane and epichlorohydrin, wherein the viscosity is adjusted by a debutylphthalate hardener type; aliphatic polyamines, in particular diethylenetriamine, dipropylenetriamine, triethylenetetramine, tertaethylenepentamine and their technical mixtures thereof, from 25 to 70% by weight of cement and from 1 to 40% by weight of a filler, for example, fly ash.

The advantages of the quick-setting putty according to the invention are, in particular, that the joint strength of the ceramic fittings is 15 to 20% higher than when bonded by the resin alone and substantially exceeds the intrinsic strength of the fittings. None of these strengths are achieved using conventional methods. The adhesion of the mastic to the ceramics is perfect, the joint has practically no water absorption and thus the excellent insulating ability of the material is maintained. The setting time is up to 4 hours to achieve final strengths, which is less than under the same conditions for resins. Acquired strengths enable either saving of reinforcing material or unusual manipulation with parts. The amount of the individual components of the quick-setting putty according to the invention can be adjusted as needed so that the putty has the most suitable properties for proper bonding, leveling of uneven surfaces.

214,315 fittings and dimensional differences. Fly ash and cement are not only a thickening component, but are indispensable for the chemical reactions themselves.

Illustrative composition of quick-setting putty is given in the examples:

1. The quick-setting putty for bonding in particular ceramic materials according to the invention consists of 63.5 weight percent cement and 36.5 weight percent of a medium molecular epoxy resin with a hardener based on aliphatic polyamines. At 4.00 hours after the application of the sealant between the ceramics, the tear of the ceramics burst at 2.22 MPa, so that the strength exceeds the stated value.

2. The quick-setting putty for bonding, in particular, the ceramic materials according to the invention consists of:

29.1 weight percent of power fly ash and 41.8 weight percent of a medium molecular weight polyamine-based epoxy resin. aliphatic. At 4.00 hours after the application of the sealant between the ceramics, the tear of the ceramic at a bursting test at 2.28 MPa resulted in the bursting of the ceramic so that the strength of the sealant exceeds the stated value.

3. The quick-setting putty for bonding in particular ceramic materials according to the invention consists of:

39.1 weight percent cement, 29.3 weight percent power fly ash, and 31.6 weight percent medium molecular epoxy resin hardener based on aliphatic polyamines. At 4.00 hours after the application of the sealant between the ceramics, the tear of the ceramics tore at 2.31 MPa, so that the strength of the sealant exceeds the stated value.

Claims (2)

Quick-setting mastic for bonding in particular ceramic materials, characterized in that it consists of 30 to 45% by weight of a medium molecular epoxy resin characterized by a viscosity of 250 to 700 P at 25 ° C, an epoxy mass equivalent of 310 to 385 and an epoxy group content of range from 0.26 to 0.32 and with a maximum chlorine content of 0.5% based on diphenylpropane and epichlorohydrin, where the viscosity is adjusted by a dibutyl phthalate plasticizer with a hardener based on aliphatic polyamines, especially diethylenetriamine, dipropylenetriamine, triethylenetetramine, tetraethylenepentamine and their technical mixtures; 25 to 70 weight percent cement. 2. A quick setting mastic for bonding in particular ceramic materials according to claim 1, characterized in that it further comprises 1 to 40 percent by weight of a filler, for example fly ash.