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TYLOVIS SE 7 is a starch ether developed especially for dry mixed mortars such as adhesives, plasters and trowel compounds.
TYLOVIS SE 7 is typically used with Tylose MC grades in these building products.
TYLOVIS SE 7 is also compatible with all common dry mixed mortar additives eg. air-entraining, dispersing and hydrophobic agents.
TYLOVIS SE 7 offers higher thickening, better slip and sag resistance as well as easy handling.
In adhesives and trowel compounds, which contain higher doses of methylcellulose, tackiness and skin formation can be reduced by the addition of TYLOVIS SE 7.
In modern dry mix mortars a wide variety of additives are used to balance the rheological properties.
Mortar formulations often include more than ten different ingredients and the development of such formulations requires great effort.
To minimize this experimental effort, a targeted selection of components is necessary, knowledge of the mode of action and possible interactions is crucial.
Behind cellulose ethers, TYLOVIS SE 7 is of major importance as additives, although their addition rate is very low (generally 0.01-0.05%).
Almost all of TYLOVIS SE 7 available in mortars are hydroxypropyl starches (HPS).
TYLOVIS SE 7 is a starch ether especially for dry mixed mortars like adhesives, plasters and trowelling compounds.
TYLOVIS SE 7 gives higher thickening, better slip and sag resistance as well as easy workability.
TYLOVIS SE 7 is typically used together with Tylose MC grades in such building products.
TYLOVIS SE is a starch ether-based thickener for the building industry.
Provides higher thickening, better slip, and sag resistance as well as easy workability.
Especially used for dry mixed mortars like adhesives, plasters, and trowelling compounds.
Is preferably used together with methylcellulose (Tylose MC grades) in a.m. building products.
TYLOVIS SE 7 is also compatible with all common dry mixed mortar additives, e.g. air entraining, dispersing, and hydrophobic agents.
In adhesives and trowelling compounds, which contain higher dosages of methylcellulose, the stickiness, as well as skin formation, can be reduced by the addition of TYLOVIS SE 7.
The recommended concentration should be 0.005 – 0.1 % by weight, calculated on dry mortar.
Uses of TYLOVIS SE 7:
TYLOVIS SE 7 offers higher thickening, better slip and sag resistance as well as easy handling.
TYLOVIS SE 7 is typically used with Tylose MC grades in these building products.
In modern dry mix mortars a wide variety of additives are used to balance the rheological properties.
Applications of TYLOVIS SE 7:
The sole purpose of a starch ether in a mortar is to change the consistency so that the wall coating does not sag and the ceramic tiles do not slip when applied to vertical walls.
TYLOVIS SE 7 markedly increases the viscosity of the mortar at low shear rates and is responsible for generating a yield point in fresh mortar.
They act as flocculants, binding fine particles together by particle bridging, which produces the desired rheological effect.
Work Structure And Mechanism of TYLOVIS SE 7:
Starch can be thought of as a condensation polymer of glucose, which is made up of anhydroglucosic units.
The main component of starch is amylopectin, one of the largest molecules in nature with an average degree of polymerization of about 2 million (corresponding to an average molecular weight of about 400 million).
TYLOVIS SE 7 has a highly branched structure, composed of short linear chains with a DP ranging from 10 to 60 glucose units.
In solution, TYLOVIS SE 7 unfolds into a treetop-like structure.
A starch ether molecule, dissolved in a concrete pore solution, has a typical diameter of about 0.3 microns.
Unfortunately, there are very few published data on the hydrodynamic radius of TYLOVIS SE 7 and those published have been determined in water and at neutral pH.
In general, TYLOVIS SE 7 are called nonionic polymers.
This is not wrong, but TYLOVIS SE 7 ignores the fact that - at high pH - some of the hydroxy groups are deprotonated and that the starch ether is indeed an anionic polymer.
Starch ether molecules must simultaneously adsorb onto two particles, connecting them together.
To do this effectively, the molecule must be anionic in charge.
Superplasticizers are anionic for the same reason.
High performance adsorption to particle surfaces in a wide range of mortar types appear to require anionic polymers.
In the concrete pore solution, each starch ether is anionic due to the mentioned deprotonation.
This is also true for hydrated lime containing gypsum systems.
But at neutral pH, for example in pure gypsum mortars, HPS does not work effectively.
In this case, the starch ether must be anionic in nature.
Therefore, TYLOVIS SE 7 particularly suitable for pH neutral gypsum mortars are carboxymethylhydroxypropyl starches (CM-HPS).
Carboxymethylation enhances the thickening effect of starch ether not only in neutral systems, but also at high pH.
Potato starch based HPS is suitable for neutral systems, but is not very effective.
Products made from other sources of botanical starch do not exhibit flocculation effects at neutral pH.
The reason for the different behavior of potato starch is that TYLOVIS SE 7 molecules contain some negatively charged phosphate ester groups.
There are two different types of TYLOVIS SE 7 among TYLOVIS SE 7 available on the market.
TYLOVIS SE 7 was discovered in 2003 and published in 2005.
They are distinguished by the dependence of the thickening effect on the dosage.
TYLOVIS SE 7 type 1 exhibits maximum flocculation efficiency, while the efficacy of type 2 products steadily increases with dosage.
The peak in the TYLOVIS SE 7 type 1 graph indicates the dosage at which deflocculation and stabilization begin to occur.
According to the authors experience, the peak is found at doses between 0.08 and 0.3%, depending on the formulation, the water / binder factor and, last but not least, the individual starch ether.
The saturated adsorption dosage is achieved when the thickening effect approaches TYLOVIS SE 7 minimum.
TYLOVIS SE 7 type 2 work by a slightly different mechanism and they show no dispersal ability.
This may be due to their much higher molecular weight.
The author is not in a position to determine molecular weight distributions, so this is only an educated guess.
The two types are just the extremes, there are products that show behavior somewhere in between.
However, most of the TYLOVIS SE 7 available on the market are of type 1.
There is only one main side effect of TYLOVIS SE 7: Most of them delay the hydration of concrete very intensively.
They not only have an effect on the rheological properties, they also influence the setting and the development of resistance, just as superplasticizers also do.
Interactions With Other Components of TYLOVIS SE 7:
In product datasheets they usually do not include any details about TYLOVIS SE 7 that would clarify how they differ from each other, often not even the type of ether is disclosed (eg HP, CM- HP), and even less information on possible interactions with the other ingredients of the preparations.
Each individual user is on their own and the product information reads as universally applicable and suitable for use in neutral and alkaline mortars.
However, practice has shown that this is only half the truth.
In the authors' experience, the individual effects of the different TYLOVIS SE 7 are dependent on:
The composition of the cement.
The composition of the aqueous phase, in particular the calcium concentration,
The structure of the cement: 'starch ether, in particular the distribution of substituents in the glucose unit and throughout the polymer chain.
Due to the setting delay effect, TYLOVIS SE 7 are often combined with accelerators.
The most common cement accelerators are calcium salts, for example calcium formate, calcium chloride or calcium nitrite.
Other TYLOVIS Products:
TYLOVIS EP 28
TYLOVIS PVA 18
