DD280872A3 - METHOD FOR PRODUCING A GLUE OVERLOCK - Google Patents

Abstract

The subject of the invention is a process for the production of an adhesive composition based on hydraulic binders in the form of Portland cements, of sand and additives, on the basis of which a construction and tile adhesive is produced, which can be used for gluing components in the duvet-bed process. The additives influence the processing and application properties in such a way that a universally usable product for use inside and outside arises. The modifying additives are black chalk, potash and cellulose ethers, the last two products being to be worked up before preparation of the mixture.

Description

Field of application of the invention

The invention relates to a method for producing a cement-bound mortar for bonding components, for example wall elements.

Characteristic of the known state of the art

For attaching tiles, tiles u. Like. Increasingly, the method of Dünnbettklebens is used. In addition to adhesives based on predominantly organic constituents, cement-based adhesive mortars are used. They are modified by the choice of suitable raw materials so that they have a good spreadability and tack in the wet state in processing thicknesses of a few millimeters, set after a few hours and after Abbindende high adhesive strengths are ups.

To influence the processing properties of the basic ingredients cement and sand such additives as methyl cellulose, water-soluble polymers, formaldehyde condensation products, Kunstsioffdispersionen z. B.

Polyvinyl acetate, polyvinyl esters or similar products included.

This results in positive properties which, however, at least partially limit the scope of application and entail the exact observance of special processing requirements. The use of synthetic resin additives and associated hardeners leads to special measures to ensure health and safety at work. These and similar special components negatively affect the cost of the finished product.

The amount of water-binding additives added in terms of quantity deteriorates the water resistance of the adhesive mortar, which, under the influence of moisture, can lead to the detachment of tiles and tiles.

DE-OS 1646493 describes a laying mortar comprising 0.1 to 1.5% by weight of methyl cellulose, 5 to 25% of iron and 1.0 to 10% by weight of a mixed polymer of 20 to 80% by weight of vinyl chloride and 80 to 20% % Vinyl propionate are added.

The mortar mixture according to DE OS 1928980 of hydraulic cement is characterized by an additive which lowers the water absorption capacity of the mortar. This agent is added to the water with the mixture of cement, sand and limestone together with water-soluble cellulose ether. The cellulose ether consists of methylcellulose.

The producible according to DE-AS 1211520 mortar mixture for laying ceramic tiles consists of a dry mixture to 24 to 99.8Gew .-% of hydraulic cement and 0.2-10Gew .-% (based on the cement) of a water-soluble hydroxyethyl cellulose and or carboxymethyl-hydroxyethyl cellulose, to which inert additives such as sand, limestone, perlite, talc, pyrophyllile, clays, diatomaceous earth, pigments, asbestos fibers and aluminum powder are added.

Dt-OS 2159936 describes a plaster or putty for the bonding of Gasbutonsteinen. It consists of cement, quartz sand, 2 to 3% dissolved methyl cellulose, liquid plastic dispersion, pumice granules and plastic fibers of about 5 to 9 mm in length.

A novel mortar composition includes DE-OS 2121390. The dry mix for bonding of aerated concrete block consists of Portland cement, about 0.4% methyl cellulose, white lime, plastic plasticizer and the majority as a gas concrete flour of grain size 0 to 1.5 mm.

The coating and casting compound according to OE-OS 2445066 contains the following constituents in the indicated amounts:

50-70 vol.% Sand 15-45 vol.% Cement

5-14 vol.% Calcium carbonate

2-10VoI .-% expanded mica

2-10Vol .-% cellulose or pulp

0-5Vol .-% polyvinyl acetate

0-5Vol .-% methylcellulose

Water is added to this mass. It then shows a sticky hold and can be used for walling, plastering, gluing insulation panels and making a shelter floor.

DE-OS 2215147 describes a lightweight mortar for connecting »Leichtπ lightweight blocks or plates. To regulate the water balance, in the interest of avoiding z. B. Schrumpfrissen be added to the light mortar from the main components cement, lime, Traß- or stone meal, fine aggregates such as slate or expandable slate and foam particles, 0.05 to 0.07 parts by weight of hydroxyethyl cellulose and 0.05 to 0.07 parts by weight metal soap ,

According to DE-OS 1571408, the cement-based inorganic binder contains a water-hardening epoxy resin, pozzolan and a gelling agent consisting of polyvinyl alcohol and methyl cellulose.

Object of the invention

The aim of the invention is to produce an adhesive mortar with a wide range of applications with good processing properties, which can be used both indoors and outdoors for bonding wall and ceiling trim elements of different Mateiial and wall blocks on a variety of Untergründon, which is inexpensive to produce, no special occupational safety requirements and that is resistant to water and weathering.

Explanation of the essence of the invention

The invention has for its object to produce by suitable Zushtze and their preparation or incorporation an adhesive mortar, which can be used for a variety of purposes.

According to the invention the object is achieved in that the basic building blocks cement and sand additives for influencing the processability, in particular the tackiness in the mixed state and peelability sow 9 are added to regulate the setting speed and the adhesion after setting end.

It was found that, in addition to the choice of additives, the type of cements and Sandfei unit or the grain spectrum of the sand are of great influence.

It has been found that the use of one type of cement alone produces optimum properties. According to the invention, two Portland cements are used in approximately the same proportion, a sulfate-resistant and a low-alkali, which are present together in a proportion of 30 to 60%, based on the dry mixture. The o.g. Properties in the wet or dry state have been achieved by the content of dry Schlärr.mkreide, in a proportion of 2 to 5%, and potash of 0.5 to 1.5%. As sand a dry sand of sufficient fineness is to be used. Stickiness and peelability in the wet state can be positively influenced with increasing fineness of the sand. It is important to orient on dry sand with a certain grain size. The mean fineness of the sand should be less than 0.3mm.

The dried potash used with a water content <5% and the cellulose ether müsser, immediately before preparing the dry mix together with a defined amount of dry sand either in a suitable mill, z. B. a pin or Schlagnasenmühle, pre-shredded or at least premixed in a mixer. The use of cement for premixing is not allowed

 Without a pretreatment in the form mentioned, the occurrence of inhomogeneities can not be ruled out.

embodiment

The essence of the invention will be in the following example! explained.

The fine-grained and pourable raw materials potash with a K ₂ CO ₃ content> 95% provided for the production of the thin bed construction and tile adhesive and the cellulose ethers were premixed with a defined amount of dry sand having a grain size of 50% less than .mu.m in a high-speed mixer , Dami! Inhomogeneities are avoided in the subsequent mixing process by wrapping the potash particles with cement.

This was followed by weighing the components with the following proportions:

sulphate-resistant, alkali-reduced Portland cement with 35 MPa 23.8% compressive strength after 28 days, measured according to TGL 28103 low-alkali Portland cement with 40 MPa compressive strength after 28 days, measured according to TGL 28103 23.8% sand of grain size 50% <0.25 mm 47.6 % Whiting 2.4% Carboxymethylcellulose 1.4% Potash 1.0%

The weighed components then passed into a forced mixer in the form of a rotary mixer, which ran at speeds> 50l) / min. The building and tile adhesive produced proved in the application technology testing good processing properties when laying a variety of wall and Derkenverkleidungselemente and the bonding of gas concrete blocks

 The test in the laboratory yielded the following results:

Setting end according to TGL 28103 12 h

Adhesive strength in accordance with TGL 28114 0.5 MPa

The RauTibeständigkoit of the thin-bed adhesive was detected by passing the test cake of about 5 mm thickness in a boiling test according to TGL 28 K3.

In particular, in the long-term test, the water resistance of the product was demonstrated, which is not achieved in comparison to known adhesive mortars with Methylzeüulose contents of 5 * 1% of the dry mix.

Claims (5)

1. A process for the production of an adhesive mortar based on Portland cement, dry sand and additives as a dry mix for bonding wall elements such as tiles, tiles or building blocks, among others, characterized by the use of a sulfate-resistant alkali-reduced and a low-alkali Portland cement with a mass fraction of 25 to 75% or 75 to 25%, based on a total content of cement of 30 to 60% of the dry finished mass, of a dry sand with a mass fraction of 35 to 65% and fine grain size with a relatively wide grain band with an average diameter of 0.1 to 0, 3 mm, dry whiting with a mass fraction of 2 to 5%, dry potash with a mass fraction of 0.5 to 1.5% and cellulose ether with a mass fraction of 0.5 to 2%, wherein the potash and the cellulose ether either in a suitable grinding agent immediately before the preparation of the dry mixture together with the dry sand to be used or a proportion of Troc kensand be pre-crushed or at least premixed in a mixer. 2. The method according to claim 1, characterized by a proportion of the sulfate-resistant alkali-reduced and the low-alkali Portland cement of 50%, based on the total content of cement. 3. The method according to claim 1 and 2, characterized by a cement content of the dry finished mixture of ^ 50%. 4. The method according to claim 1, 2 and 3, characterized by the use of dry sand having an average diameter of ^ 0.25 mm. 5. The method of claim 1, 2, 3 and 4, characterized by the use of carboxymethyl cellulose as cellulose ether.