DE102010042003A1 - Use of polypropylene oxide or ethylene oxide-propylene oxide copolymer as adhesion-improving additive in adhesive and reinforcing mortar - Google Patents

Abstract

The invention relates to the use of polypropylene oxides or ethylene oxide-propylene oxide copolymers as an adhesion-improving additive in adhesive and reinforcing mortar for thermal insulation composite systems.

Description

The invention relates to the use of polypropylene oxide or ethylene oxide-propylene oxide copolymer as adhesion-improving additive in adhesive and reinforcing mortar for thermal insulation composite systems.

To build a thermal insulation composite system (ETICS) insulation boards, generally rigid polystyrene panels are attached to the masonry with an adhesive mortar, then a reinforcing mortar is applied to the insulation boards, in the layer generally fiber fabric or fibers are inserted, and finally the composite system with a top coat covered. Essential for the property profile of such adhesive mortars and reinforcing mortars are in addition to the good processability of the fresh mortar in the cured mortar compositions high flexibility and impact resistance, good water vapor permeability, water-repellent properties, good adhesion to mineral substrates and good adhesion to the insulating materials, in particular to polystyrene.

To set an optimum property profile, therefore, the formulations underlying the adhesive mortars and reinforcing mortars are modified with thermoplastic polymers based on ethylenically unsaturated monomers. Frequently, dry mortars containing mineral binders are modified with water-redispersible polymer powders on the basis of the above-mentioned thermoplastic polymers. With this polymer modification, mortar compositions are obtained which meet the above requirements.

Under special climatic conditions, with high humidity and heat, however, the adhesion of said mortar compounds to polystyrene substrates is unsatisfactory.

In the US 2007/0256600 A1 For this purpose, phosphate monoesters, diesters and triesters are used as adhesion promoter. However, a disadvantage is the high price of these additives.

From the EP 0698586 A1 It is known to improve the adhesion to polystyrene substrates by adding aromatic polyethers. The disadvantage here is that environmental concerns have arisen against the use of such compounds.

It was therefore an object to improve the adhesion of adhesive mortars and reinforcing mortars on polystyrene surfaces and thereby overcome the above-mentioned disadvantages.

The object was achieved by the use of polypropylene oxides or ethylene oxide-propylene oxide copolymers.

Polypropylene oxide (polypropylene glycol) is from the EP 0573036 B1 Known as Schwundmaßreduzierender additive. In the DE-OS 1935507 Polypropylene glycol is called as a defoamer for mortar or concrete compounds. In the WO 01/04212 A1 For example, a combination of phenol-formaldehyde condensate and polyoxyalkylene compounds is used to improve the redispersibility of water-redispersible polymer powders.

The invention relates to the use of polypropylene oxides or ethylene oxide-propylene oxide copolymers as adhesion-improving additive in adhesive and reinforcing mortar for external thermal insulation systems.

Suitable polypropylene oxides (polypropylene glycols) of the formula H- [OCH ₂ CH ₂ CH ₂ ] _n -OH are generally those with n = 5 to 70, which corresponds approximately to a weight-average molecular weight of 400 to 4000 g / mol. Preference is given to polypropylene oxides having a weight-average molecular weight of from 1000 to 4000 g / mol, more preferably from 2000 to 4000 g / mol. Also suitable are copolymers which contain ethylene oxide and propylene oxide monomer units (EO-PO copolymers) and which have a weight-average molecular weight of from 400 to 4000 g / mol. Preference is given to EO-PO copolymers having more than 50 mol% of PO units.

In general, the polypropylene oxides or ethylene oxide-propylene oxide copolymers are used to improve the adhesion in an amount of 0.05 to 5 wt .-%, preferably 0.2 to 2 wt .-%, each based on the proportion of polymer powder c).

The bonding and reinforcing mortars for thermal insulation composite systems are generally provided as dry mortar compositions and mixed with water at the construction site. The dry mortar compositions contain a) one or more mineral binders, b) one or more fillers, c) one or more water-redispersible polymer powders based on polymers of ethylenically unsaturated monomers having a glass transition temperature Tg of -25 ° C to + 25 °, and optionally d) further additives.

Suitable mineral binders a) are, for example, cements, in particular Portland cement, aluminate cement, trass cement, metallurgical cement, magnesia cement, phosphate cement or blastfurnace cement, as well as mixed cements, filler cements, fly ash, microsilica, lime and gypsum. Preference is given to Portland cement, Aluminatzement and Hüttenzement, and mixed cements, fillers, lime and gypsum. In general, the dry mortar compositions contain from 5 to 50% by weight, preferably from 10 to 30% by weight, of mineral binders, each based on the total weight of the dry mortar composition.

Examples of suitable fillers b) are quartz sand, quartz powder, calcium carbonate, dolomite, aluminum silicates, clay, chalk, hydrated lime, talc or mica, or light fillers such as pumice, foam glass, aerated concrete, perlite, vermiculite, carbon nanotubes (CNT). It is also possible to use any desired mixtures of the stated fillers. Preference is given to quartz sand, quartz flour, calcium carbonate, chalk or hydrated lime. In general, the dry mortar compositions contain from 30 to 90% by weight, preferably from 40 to 80% by weight, of fillers, based in each case on the total weight of the dry mortar composition.

Further customary additives d) for dry mortar compositions are thickeners, for example polysaccharides such as cellulose ethers and modified cellulose ethers, starch ethers, guar gum, xanthan gum, sheet silicates, polycarboxylic acids such as polyacrylic acid and their partial esters, and polyvinyl alcohols which may be acetalated or hydrophobically modified, casein and associative thickener. Typical additives are also retarders, such as hydroxycarboxylic acids, or dicarboxylic acids or their salts, saccharides, oxalic acid, succinic acid, tartaric acid, gluconic acid, citric acid, sucrose, glucose, fructose, sorbitol, pentaerythritol. A common additive are setting accelerators, for example, alkali or alkaline earth salts of inorganic or organic acids. In addition, mention may be made of water repellents, preservatives, film-forming aids, dispersants, foam stabilizers, defoamers and flameproofing agents (eg aluminum hydroxide).

The additives d) are used in the customary, depending on the nature of the additive, amounts. In general, the amounts are from 0.1 to 10 wt .-%, each based on the total weight of the dry mortar composition.

As water-redispersible polymer powder c) refers to powder compositions which are accessible by drying the corresponding aqueous dispersions of the base polymers in the presence of protective colloids. Due to this manufacturing process, the finely divided resin of the dispersion is coated with a water-soluble protective colloid of sufficient amount. During drying, the protective colloid acts like a shell, which prevents the particles from sticking together. When redispersing in water, the protective colloid dissolves again in water and an aqueous dispersion of the original polymer particles is present ( Schulze J. in TIZ, No. 9, 1985 ).

Suitable polymers of ethylenically unsaturated monomers are those based on one or more monomers from the group comprising vinyl esters, (meth) acrylic esters, vinylaromatics, olefins, 1,3-dienes and vinyl halides and optionally further monomers copolymerizable therewith.

Suitable vinyl esters are those of carboxylic acids having 1 to 15 carbon atoms. Preference is given to vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methylvinyl acetate, vinyl pivalate and vinyl esters of α-branched monocarboxylic acids having 9 to 11 C atoms, for example VeoVa9 ^R or VeoVa10 ^R (trade name of the company Resolution). Particularly preferred is vinyl acetate.

Suitable monomers from the group of acrylic acid esters or methacrylic acid esters are esters of unbranched or branched alcohols having 1 to 15 C atoms. Preferred methacrylic esters or acrylates are methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, n-butyl acrylate, n-butyl methacrylate, t-butyl acrylate, t-butyl methacrylate, 2-ethylhexyl acrylate. Particularly preferred are methyl acrylate, methyl methacrylate, n-butyl acrylate, t-butyl acrylate and 2-ethylhexyl acrylate.

Preferred vinyl aromatic compounds are styrene, methylstyrene and vinyltoluene. Preferred vinyl halide is vinyl chloride. The preferred olefins are ethylene, propylene and the preferred dienes are 1,3-butadiene and isoprene.

Optionally, from 0.1 to 5 wt .-%, based on the total weight of the monomer mixture, auxiliary monomers are copolymerized. Preferably, 0.5 to 2.5 wt .-% auxiliary monomers are used. Examples of auxiliary monomers are ethylenically unsaturated mono- and dicarboxylic acids, preferably acrylic acid, methacrylic acid, fumaric acid and maleic acid; ethylenically unsaturated carboxylic acid amides and nitriles, preferably acrylamide and acrylonitrile; Mono- and diesters of fumaric acid and maleic acid, such as diethyl and diisopropyl esters and maleic anhydride; ethylenically unsaturated sulfonic acids or salts thereof, preferably vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid. Further examples are precrosslinking comonomers such as multiply ethylenically unsaturated comonomers, for example diallyl phthalate, divinyl adipate, diallyl maleate, allyl methacrylate or triallyl cyanurate, or post-crosslinking comonomers, for example acrylamidoglycolic acid (AGA), methyl acrylamidoglycolic acid methyl ester (MAGME), N-methylolacrylamide (NMA), N-methylol methacrylamide, N- Methylolallyl carbamate, alkyl ethers such as the isobutoxy ether or esters of N-methylolacrylamide, N-methylolmethacrylamide and N-methylolallylcarbamate. Also suitable are epoxide-functional comonomers such as glycidyl methacrylate and glycidyl acrylate. Further examples are silicon-functional comonomers, such as acryloxypropyltri (alkoxy) and methacryloxypropyltri (alkoxy) silanes, vinyltrialkoxysilanes and vinylmethyldialkoxysilanes, where as alkoxy groups, for example, ethoxy and ethoxypropylene glycol ether radicals may be present. Mention may also be made of monomers having hydroxyl or CO groups, for example methacrylic acid and acrylic acid hydroxyalkyl esters such as hydroxyethyl, hydroxypropyl or hydroxybutyl acrylate or methacrylate, and also compounds such as diacetoneacrylamide and acetylacetoxyethyl acrylate or methacrylate.

The monomer selection or the selection of the weight proportions of the comonomers is carried out so that a glass transition temperature Tg of -25 ° C to + 25 ° C, preferably -10 ° C to + 10 ° C, more preferably -10 ° C to 0 ° C. results. The glass transition temperature Tg of the polymers can be determined in a known manner by means of differential scanning calorimetry (DSC) (determination of the inflection point of the curve). The Tg can also be approximated by the Fox equation. To Fox TG, Bull. Physics Soc. 1, 3, Page 123 (1956) where: 1 / Tg = x1 / Tg1 + x2 / Tg2 + ... + xn / Tgn, where xn is the mass fraction (wt% / 100) of the monomer n, and Tgn is the glass transition temperature in Kelvin of the homopolymer of the monomer n is. Tg values for homopolymers are in Polymer Handbook 2nd Edition, J. Wiley & Sons, New York (1975) listed.

Preference is given to copolymers of vinyl acetate with 1 to 50 wt .-% of ethylene;
Copolymers of vinyl acetate with 1 to 50 wt .-% of ethylene and 1 to 50 wt .-% of one or more other comonomers from the group of vinyl esters having 1 to 12 carbon atoms in the carboxylic acid radical such as vinyl propionate, vinyl laurate, vinyl esters of alpha-branched carboxylic acids with 9 to 13 C atoms, such as VeoVa9, VeoVa10, VeoVa11;
Copolymers of vinyl acetate, 1 to 50 wt .-% of ethylene and preferably 1 to 60 wt .-% of (meth) acrylic acid esters of unbranched or branched alcohols having 1 to 15 carbon atoms, in particular n-butyl acrylate or 2-ethylhexyl acrylate; and copolymers having 30 to 75 wt .-% vinyl acetate, 1 to 30 wt .-% vinyl laurate or vinyl ester of an alpha-branched carboxylic acid having 9 to 11 carbon atoms, and 1 to 30 wt .-% of (meth) acrylic acid esters of unbranched or branched alcohols having 1 to 15 carbon atoms, in particular n-butyl acrylate or 2-ethylhexyl acrylate, which still contain 1 to 40 wt .-% of ethylene;
Copolymers with vinyl acetate, 1 to 50% by weight of ethylene and 1 to 60% by weight of vinyl chloride; in which
the polymers may also contain the abovementioned auxiliary monomers in the stated amounts, and the data in% by weight add up to in each case 100% by weight.

Also preferred are (meth) acrylic acid ester polymers, such as copolymers of n-butyl acrylate or 2-ethylhexyl acrylate or copolymers of methyl methacrylate with n-butyl acrylate and / or 2-ethylhexyl acrylate;
Styrene-acrylic acid ester copolymers with one or more monomers from the group of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate;
Vinyl acetate-acrylic acid ester copolymers with one or more monomers from the group of methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate and optionally ethylene;
Styrene-1,3-butadiene copolymers;
wherein the polymers can still contain the said auxiliary monomers in the stated amounts, and the data in wt .-% add up to each 100 wt .-%.

Most preferred are water-redispersible polymer powders c) comprising copolymers with vinyl acetate and 5 to 50% by weight of ethylene, or
Copolymers with vinyl acetate, 1 to 50 wt .-% of ethylene and 1 to 50 wt .-% of a vinyl ester of α-branched monocarboxylic acids having 9 to 11 carbon atoms, or
Copolymers with 30 to 75 wt .-% vinyl acetate, 1 to 30 wt .-% vinyl laurate or vinyl ester of an alpha-branched carboxylic acid having 9 to 11 carbon atoms, and 1 to 30 wt .-% of (meth) acrylic acid esters of unbranched or branched Alcohols having 1 to 15 carbon atoms, which still contain 1 to 40 wt .-% of ethylene, or
Copolymers with vinyl acetate, from 5 to 50% by weight of ethylene and from 1 to 60% by weight of vinyl chloride, it being possible for the polymers to contain the abovementioned auxiliary monomers in the stated amounts, and the data in% by weight to 100% by weight in each case. - Add up%.

The polymers are prepared by the emulsion polymerization process or by the suspension polymerization process in the presence of protective colloids, preferably by the emulsion polymerization process, wherein the polymerization temperature is generally from 20 ° C to 100 ° C, preferably from 60 ° C to 90 ° C, and in the copolymerization of gaseous comonomers such as ethylene under pressure, generally between 5 bar and 100 bar, can be worked.

The initiation of the polymerization takes place with the water-soluble or monomer-soluble initiators or redox initiator combinations customary for emulsion polymerization or suspension polymerization. Examples of water-soluble initiators are sodium persulfate, hydrogen peroxide, azobisisobutyronitrile. Examples of monomer-soluble initiators are dicetyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, dibenzoyl peroxide. The initiators mentioned are generally used in an amount of 0.01 to 0.5 wt .-%, based on the total weight of the monomers. Combinations of the stated initiators in combination with reducing agents are used as redox initiators. Suitable reducing agents are, for example, sodium sulfite, sodium hydroxymethanesulfinate and ascorbic acid. The amount of reducing agent is preferably 0.01 to 0.5 wt .-%, based on the total weight of the monomers.

For controlling the molecular weight, regulating substances can be used during the polymerization. If regulators are used, they are usually used in amounts of from 0.01 to 5.0% by weight, based on the monomers to be polymerized, and are metered in separately or else premixed with reaction components. Examples of such substances are n-dodecyl mercaptan, tert-dodecyl mercaptan, mercaptopropionic acid, methyl mercaptopropionate, isopropanol and acetaldehyde. Preferably, no regulatory substances are used.

To stabilize the polymerization batch, protective colloids are used, if appropriate in combination with emulsifiers. Suitable protective colloids are partially hydrolyzed or fully hydrolyzed polyvinyl alcohols; polyvinylpyrrolidones; polyvinyl; Polysaccharides in water-soluble form such as starches (amylose and amylopectin) or dextrins or cyclodextrins, celluloses and their carboxymethyl, methyl, hydroxyethyl, hydroxypropyl derivatives; Proteins such as casein or caseinate, soy protein, gelatin; lignin; synthetic polymers such as poly (meth) acrylic acid, copolymers of (meth) acrylates with carboxyl-functional comonomer units, poly (meth) acrylamide, polyvinylsulfonic acids and their water-soluble copolymers; Melamine formaldehyde sulfonates, naphthalene formaldehyde sulfonates, styrene maleic acid and vinyl ether maleic acid copolymers; cationic protective colloids, for example polymers with monomer units with quaternary ammonium groups. Preference is given to partially hydrolyzed or fully hydrolyzed polyvinyl alcohols. Particularly preferred are partially hydrolyzed polyvinyl alcohols having a degree of hydrolysis of 80 to 95 mol% and a Höppler viscosity in 4% aqueous solution of 1 to 30 mPas (Höppler method at 20 ° C, DIN 53015 ).

After completion of the polymerization, residual monomer removal can be postpolymerized using known methods, for example by postpolymerization initiated with the redox catalyst. Volatile residual monomers can also be removed by means of distillation, preferably under reduced pressure, and optionally by passing or passing inert inert gases, such as air, nitrogen or steam. The aqueous dispersions obtainable therewith have a solids content of from 30 to 75% by weight, preferably from 50 to 60% by weight.

To prepare the polymer powders which are redispersible in water, the dispersions are dried, if appropriate after the addition of further protective colloids as a drying aid, for example by means of fluidized bed drying, freeze drying or spray drying. Preferably, the dispersions are spray-dried. The spray drying is carried out in conventional spray drying systems, wherein the atomization can be done by means of one-, two- or multi-fluid nozzles or with a rotating disk. The Exit temperature is generally in the range of 45 ° C to 120 ° C, preferably 60 ° C to 90 ° C, depending on the system, Tg of the resin and the desired degree of drying selected. The viscosity of the food to be atomized is adjusted via the solids content so that a value of <500 mPas (Brookfield viscosity at 20 revolutions and 23 ° C.), preferably <250 mPas, is obtained. The solids content of the dispersion to be atomized is> 35%, preferably> 40%.

In general, the drying aid is used in a total amount of 0.5 to 30 wt .-%, based on the polymeric constituents of the dispersion. That is, the total amount of protective colloid before the drying process should be at least 1 to 30 wt .-%, based on the polymer content; 5 to 20% by weight, based on the polymer fraction, are preferably used.

Suitable drying aids are known to the person skilled in the art and are, for example, the abovementioned protective colloids. Particularly preferred are partially hydrolyzed polyvinyl alcohols having a degree of hydrolysis of 80 to 95 mol% and a Höppler viscosity in 4% aqueous solution of 1 to 30 mPas (Höppler method at 20 ° C, DIN 53015 ).

During atomization, a content of up to 1.5% by weight of antifoaming agent, based on the base polymer, has proven favorable in many cases. In order to increase the shelf life by improving the blocking stability, in particular in the case of powders with a low glass transition temperature, the powder obtained may be provided with an antiblocking agent, preferably from 1 to 30% by weight, based on the total weight of polymeric constituents. Examples of antiblocking agents are Ca or Mg carbonate, talc, gypsum, silicic acid, kaolins such as metakaolin, silicates having particle sizes preferably in the range from 10 nm to 10 μm.

The addition of the polypropylene oxide or ethylene oxide / propylene oxide copolymer fraction preferably takes place together with the proportion of water-redispersible polymer powder to form a dry mortar formulation for adhesive or reinforcing mortar. For this purpose, the proportion of polypropylene oxide or ethylene oxide / propylene oxide copolymer is added before or during the preparation of the polymer dispersion by means of polymerization. The polypropylene oxide or ethylene oxide / propylene oxide copolymer fraction may also be added to the polymer dispersion before spray drying.

The preparation of the dry mortar composition is generally carried out so that the components a) to d), and optionally the adhesion-improving additive according to the invention as far as it is not added to the polymer powder portion, mixed and homogenized in conventional powder mixing devices to form a dry mortar. The amount of water required for processing to mortar masses is added before preparation. It is also possible to proceed in such a way that the individual components a) to d) and, if appropriate, the adhesion-improving additive according to the invention, if it is not added with the polymer powder fraction, are separately stirred with water to form a mortar composition.

The adhesion-promoting additive may also, if it is present under normal conditions as a liquid, be applied to a solid support material, for example silicic acid, and added in this form to the polymer powder or to a dry mortar composition.

When used according to the invention, the adhesive and reinforcing mortars for thermal insulation composite systems are preferably used for bonding and reinforcing polystyrene panels and rock wool molded bodies.

The following examples serve to further illustrate the invention:
In the (comparative) Examples 1 to 4, the following redispersible polymer powders were used:

Dispersion powder 1:

Dispersion powder based on a vinyl acetate-ethylene copolymer having a Tg of -7 ° C with polyvinyl alcohol protective colloid and 1.0 wt .-% polypropylene glycol having a weight average molecular weight of about 430 (Pluriol ^R P400 Fa. BASF) on dispersion powder.

Dispersion powder 2:

Dispersion powder based on a vinyl acetate-ethylene copolymer having a Tg of -7 ° C with polyvinyl alcohol protective colloid and 1.0 wt .-% polypropylene glycol having a weight-average molecular weight of about 2000 (Pluriol ^R P2000 Fa. BASF) on dispersion powder.

Dispersion powder 3:

Dispersion powder based on a vinyl acetate-ethylene copolymer having a Tg of -7 ° C with polyvinyl alcohol protective colloid.

Dispersion powder 4:

Dispersion powder based on a vinyl acetate-ethylene copolymer having a Tg of -7 ° C with polyvinyl alcohol protective colloid and 1.0 wt .-% of aromatic polyether, based on dispersion powder.

To prepare the mortar compositions for the (comparative) Examples 1 to 4, the ingredients listed in Table 1, in the amounts listed there, were mixed with the amounts of water mentioned in Table 1 to the mortar composition.

For testing, the mortar compositions were each applied as reinforcing mortar in a layer thickness of 4 mm on expanded polystyrene (EPS) plates.

After hardening of the reinforcing layer and storage of the test specimens, the tensile adhesion and the eruption on EPS plates were determined according to the test method DIN 18555-6 detected. It was stored under two different conditions:
14 days in normal climate at 23 ° C and 50% relative humidity (NK),
or 12 days in normal climate and then 2 days water storage at 23 ° C.

The results of the testing are summarized in Table 1.

The results show that with the mortars modified according to the invention (Examples 1 and 2) the adhesion to the thermal insulation board is significantly improved - see comparison of the adhesion values and EPS-Ausriss of Example 1 and 2 with Comparative Examples 3 and 4. In particular, the bond only after water storage Insignificantly weakened (Example 1, Ex. 2), while in the comparative examples after water storage, the quality of the bond, which is already low anyway, again clearly breaks (see EPS cut-out). Table 1: Example 1 Ex. 2 V.bsp. 3 V.bsp. 4 Recipe (ingredients in parts by weight) White cement 42.5 283.5 283.5 283.5 283.5 Quartz sand AKW 9a 510 510 510 510 Calcium carbonate MHS 190 190 190 190 Cellulose ethers MH 10001 P4 1.5 1.5 1.5 1.5 Dispersion powder 1 15 Dispersion powder 2 15 Dispersion powder 3 15 Dispersion powder 4 15 Water in ml per 1000 g 220 220 220 220 Test results: Adhesive pull N / mm ² (14 d NK) 0.12 0.12 0.07 0.09 Adhesive pull N / mm ² (12d NK + 2d H ₂ O) 0.10 0.10 0.04 0.05 EPS-Ausriss% (14 d NK) 100 95 10 45 EPS breakout% (12d NK + 2d H ₂ O) 90 90 5 25

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2007/0256600 A1 [0005]
• EP 0698586 A1 [0006]
• EP 0573036 B1 [0009]
• DE 1935507 A [0009]
• WO 01/04212 A1 [0009]

Cited non-patent literature

• Schulze J. in TIZ, No. 9, 1985 [0018]
• Fox TG, Bull. Physics Soc. 1, 3, Page 123 (1956) [0024]
• Polymer Handbook 2nd Edition, J. Wiley & Sons, New York (1975) [0024]
• DIN 53015 [0031]
• DIN 53015 [0035]
• DIN 18555-6 [0048]

Claims (8)

Use of polypropylene oxides or ethylene oxide-propylene oxide copolymers as adhesion-improving additive in adhesive and reinforcing mortar for thermal insulation composite systems. Use according to claim 1, characterized in that one or more polypropylene oxides having a weight-average molecular weight of 400 to 4000 g / mol are used. Use according to claim 1 or 2, characterized in that one or more copolymers containing ethylene oxide and propylene oxide monomer units having a weight-average molecular weight of 400 to 4000 g / mol and more than 50 mol% of PO units are used become. Use according to claim 1 to 3, characterized in that the polypropylene oxides or ethylene oxide-propylene oxide copolymers are used in a dry mortar composition comprising a) one or more mineral binders, b) one or more fillers, c) one or more water-redispersible polymer powder based on polymers of ethylenically unsaturated monomers having a glass transition temperature Tg of -25 ° C to + 25 °, and optionally d) further additives. Use according to claim 4, characterized in that the polypropylene oxides or ethylene oxide-propylene oxide copolymers are used in a dry mortar composition as a component of component c). Use according to claim 4 or 5, characterized in that as component a) one or more mineral binders from the group containing Portland cement, Aluminatzement and Hüttenzement, mixed cements, fillers, hydraulic lime and gypsum are included. Use according to claim 4 to 6, characterized in that as component b) one or more fillers from the group containing quartz sand, quartz powder, calcium carbonate, chalk and hydrated lime are contained. Use according to claim 4 to 7, characterized in that as component c) one or more water-redispersible polymer powder from the group comprising copolymers with vinyl acetate and 5 to 50 wt .-% of ethylene; Copolymers with vinyl acetate, 1 to 50 wt .-% of ethylene and 1 to 50 wt .-% of a vinyl ester of α-branched monocarboxylic acids having 9 to 11 carbon atoms; Copolymers with 30 to 75 wt .-% vinyl acetate, 1 to 30 wt .-% vinyl laurate or vinyl ester of an alpha-branched carboxylic acid having 9 to 11 carbon atoms, and 1 to 30 wt .-% of (meth) acrylic acid esters of unbranched or branched Alcohols having 1 to 15 carbon atoms, which still contain 1 to 40 wt .-% of ethylene; Copolymers with vinyl acetate, 5 to 50% by weight of ethylene and 1 to 60% by weight of vinyl chloride; are contained, wherein the data in wt .-% add up to each 100 wt .-%.