DE2626229C3 - - Google Patents

Description

can be achieved using a paint or coating material of high adhesive strength and high extensibility using per se known painting and loading devices, preferably using brushes, rollers or spray equipment, in the form of at least one base coat applied on the basis of one or more polyacrylic acid ester dispersions and after drying painted over with a top coat based on a synthetic resin dispersion or synthetic resin solution or coated.

In the context of the invention, a structurally viscous, slightly thixotropic plastic dispersion which becomes colorless, permanently elastic on the surface adhesive film dries up, on the basis of an or several polyacrylic acid ester dispersions, preferably one or more acrylic acid ester copolymer dispersions used with a copolymer content of up to 30% by weight (based on the total polymer), that of 96-99% by weight, preferably 97.5-98.5 % By weight, of one or more polyarsylic acid ester dispersions and / or one or more acrylic acid copolymer dispersions whose solids content is at least 48% by weight (based on 100% by weight pure synthetic resin dispersion), the minimum temperature of which at -2 ° to + 5 ° C, preferably at 0 °, and its dried film at 24 Hours of water storage has a water absorption below 12%, and 4.0-1.0% by weight, preferably 2.5-1.5% by weight of one or more organic chemical Solvents which swell or dissolve the plastic particles present in the dispersion and have an evaporation rate above 10, preferably above 35 and / or one or more per se known additives (except fillers, pigments or opacifying substances), preferably antifoam and / or preservative, there is a top coat after the base coat has dried or top coat based on one or more polyacrylic acid ester dispersions or solutions or a polyvinyl acetate dispersion or solution, preferably based on one or more vinyl acetate copolymer resin dispersions or solutions applied, which after drying a colorless, elastic Layer forms. Because of this; The process is a colorless or almost colorless permanently elastic coating and / or sealing of cracks, joints, imperfections and the like on structures or parts of structures achieved without & "s visual appearance of the to change surfaces to be sealed, so that the existing structure and color is preserved or remains almost unchanged. After drying, the coating is no longer sticky or almost non-sticky.

According to a preferred embodiment, a base coat or base coating material is applied the basis of a low-plasticizer, preferably plasticizer-free, polyacrylic acid ester dispersion, preferably one or more acrylic ester copolymer dispersions, with a solids content of 48-65% by weight, preferably 50-60% by weight (based on 100% by weight of pure synthetic resin dispersion) used.

The based on one or more polyacrylic acid ester dispersions, preferably one or more acrylic acid ester copolymer dispersions used Top coat or top coat from 92 to 992% by weight, preferably 97.5 to 983 % By weight of one or more polyacrylic acid ester dispersions and / or one or more acrylic acid ester copolymer dispersions, whose solids content is 48 to 65% by weight and whose minimum film

S-forming temperature above 10 ° C, preferably at about 15-20 ⁰ C, and the dried film after 24 hours of immersion in water has a water absorption below 12% has, 7 to 0.7 wt .-%, preferably 2 to 1.0 weight % of one or more organochemical solvents that swell or dissolve the plastic particles present in the dispersion and have an evaporation number above 10, preferably above 35, and 1.0 to 0.1% by weight, preferably 0, 5 to 0.2% by weight of additives known per se,

ij preferably defoamers and / or preservatives.

According to one embodiment, the topcoat used on the basis of one or more polyacrylic acid ester solutions and / or a polyvinyl acetate solution, preferably one or more acrylic acid ester copolymer solutions, or one or more vinyl acetate copolymer solutions contains 12 to 30% by weight, preferably 14 to 20% by weight (calculated as Resin in solid form) Acrylic acid ester resin, preferably acrylic acid ester copolymer and / or vinyl acetate copolymer resin, which is dissolved in 87 to 64.5% by weight, preferably 833 to 76% by weight of one or more solvents for the acrylic acid ester resin or vinyl acetate resin and 1, 0-53% by weight, preferably Xi to 4% by weight, additives, preferably plasticizers and / or matting agents. These topcoats protect the applied stretchable film from the effects of the weather and can also be adapted to the degree of gloss of the substrate.

According to a preferred embodiment, the base paint is applied in two work steps using known tools, in the first step the base paint is applied in a layer thickness (measured as dry layer thickness) of 100-140 μm and after drying in a second step with the Base coat, a top coat or a top coat is carried out so that a total layer thickness of the base coat of 200-280 μm (measured as the base coat thickness) is achieved, with the base coat obtained in this way having an elongation at break of approx. 160-220% at ^{0 0 after complete drying} C and from 750-950% at 20 ° C (test conditions: clamping length 40 mm, film width 4 mm, film thickness 0.2-0.28 mm, expansion rate 150 mm / min). According to an expedient embodiment, additives are 1.0% -0.1%, preferably 0.5% -0.2%, antifoam agents and 0.5% -

5j 0.05%, preferably 0.2% -0.1%, of a preservative contain.

According to one embodiment, the top paint used in the form of a dispersion as Additive 0.5% by weight - 0.05% by weight, preferably

te 0.3% by weight - 0.10% by weight, of a preservative added Up to 20% by weight of a matting agent, preferably in the form of a 10-30% aqueous dispersion of micronized silica gels, be admitted.

On the other hand, in the top coat used in the form of a solution, 0.5% by weight - 2J5 % by weight, preferably 1.2% by weight -

1.5% by weight, plasticizer and 0.5% by weight - 3 % By weight, preferably 1.0% by weight - 2.5% by weight, matting agent, preferably fumed silica, contain.

The method according to the invention is particularly suitable for sealing exposed masonry, clinker brick facades, sand-lime bricks, ceramic cladding, high-quality plaster and wash plasters, as well as natural 'ind artificial stone slabs.

IO

Examples

1. Primer material

96.00 parts by weight of acrylic acid ester copolymer

dispersion with a _{) 5}

Copolymer content <30%

and

a film formation temperature

body content of 50 wt .-% 2.00 parts by weight white spirit
0.50 part by weight of carbitol acetate
1.50 parts by weight of antifoam agent

+ Preservatives

100.00 '5

2. Precoating material

99.00 parts by weight of polyacrylic acid ester dispersion with a solids content of

approx. 50% by weight

0.85 parts by weight diglycol acetate

0.15 part by weight defoamer

+ Preservatives

100.00

3. Top coat material, water-based or
Dispersion base, glossy

92.00 parts by weight Acrylsäureestercopolyrnerdispersion with a Filmbildungstemperatui <I 5 ⁰ C and a Festkörpergehah of about 50 wt .-% 7.00 wt. Parts of mixture of white spirit,

Glycol and diglycol acetate 1.00 part by weight defoamer

+ Preservative 100.00

4. Topcoat material with matt finish

100.00 parts by weight of the composition according to

Example 3

2.00 parts by weight 20% dispersion of up to
4.00 parts by weight of fumed silica

5. Top coat, containing solvents

12.00 parts by weight of polyvinyl acetate copolymer resin

(fixed)
87.00 parts by weight solvent mixture,

consisting of alcohols, aromatics and esters 0 ^ 0 parts by weight plasticizer 0.50 parts by weight micronized silica 100.00

6. Top coat, containing solvents

30.00 parts by weight of polyacrylic acid ester resin

(fixed)

6430 parts by weight solvent mixture, consisting of aromatics, white spirit and esters 2 ^ 0 parts by weight plasticizer 3.00 parts by weight of fumed silica 100.00

Claims (8)

Patent claims: 1. Process for the production of colorless elastic coatings or seals from s Cracks, joints and defects in structures or parts of structures using a paint or coating material of high adhesive strength and high elasticity, which under Use of known painting and coating devices, preferably below Use of brushes, rollers or spray equipment, in the form of at least one base layer on the Based on one or more polyacrylic acid ester dispersions applied and after drying with a top coat on the basis of a synthetic resin dispersion or synthetic resin solution is painted over or coated, characterized in that that a pseudoplastic, slightly thixotropic one is used as the primer or primer coating material rPlastic dispersion, which results in a colorless, permanently elastic, film adhering to the surface dries up, on the basis of one or more Polyacrylic acid ester dispersions, preferably one or more acrylic acid ester copolymer dispersions with a copolymer content of up to 30% by weight (based on the total polymer) that is used from 96 to 99 wt% one or more Polyacrylsäureesterdispersionen and / or one or more Acrylsäureestercopolymerisatdispersionen is, the solids content at least 48 wt .-% (based on 100 wt .-% pure resin dispersion) is the minimum film forming temperature at -2 ° to +5 ⁰ C, preferably at 0 ° C and the dried film of which has a water absorption of less than 12% after storage in water for 24 hours and 4.0 to 1.0% by weight one or more organic chemical solvents, that or which swell or swell the plastic particles present in the dispersion dissolve and have an evaporation number above 10, preferably above 35, and / or one or several additives known per se (with the exception of fillers, pigments or opacifying agents Substances), preferably antifoam and / or con s ^ rvierungsmittel, and after drying a top coat or top coat on the base one or more polyacrylic acid ester dispersions or solutions or a polyvinyl acetate dispersion or solution, preferably based on one or more acrylic acid ester copolymer dispersions or solutions and / or one or more vinyl acetate copolymer resin dispersions or solutions is applied, which forms a colorless, elastic layer after drying 2. The method according to claim 1, characterized in that that one or more low-plasticizer, preferably plasticizer-free, polyacrylic acid ester dispersions, preferably one or more acrylic acid ester copolymer dispersions, with a solids content of 4fl to 65% by weight (based on 100% by weight pure Synthetic resin dispersion) is used. 3. The method according to claims 1 and 2, characterized in that on the basis of a or more polyacrylic acid ester dispersions, preferably one or more acrylic acid ester copolymer dispersions, used topcoats or topcoats 92 to 99.2% by weight one or more Polyacrylsäureesterdispersionen and / or one or more Acrylsäureestercopolymerisatdispersionen whose solids content is 48 to 65 wt .-% and the minimum film-forming temperature above 10 ° C, preferably at about 15-20 ⁰ C, and the dried film after 24 hours of immersion in water has a water intake below 12%, 7 to 0.7% by weight one or more organochemical solvents that are used in the dispersion existing plastic particles swell or dissolve and an evaporation number over 10, preferably over 35, as well 1.0 to 0.1% by weight known additives, preferably defoaming agents and / or preservatives, consists 4. The method according to claims 1 and 2, characterized in that on the basis of a or several polyacrylic acid ester solutions and / or a polyvinyl acetate solution, preferably one or more acrylic acid ester copolymer solutions or one or more vinyl acetate copolymer solutions topcoats used 12 to 30% by weight (calculated as resin in solid form) Acrylic acid ester resin, preferably acrylic acid ester copolymer and / or vinyl acetate copolymer resin used in 87 to 64.5 wt% one or more solvents for the acrylic acid ester resin b? w. Vinyl acetate resin is dissolved and 1.0 to 53% by weight Contains additives, preferably plasticizers and / or matting agents. 5. The method according to claims f -4, characterized characterized in that the base paint is used in two operations per se known tools is applied, the primer in the first step a layer thickness (measured as dry layer thickness) of 100-140 μm is applied and after after drying in a second work step with the primer coat or an overcoat is carried out so that a total layer thickness of the base paint of 200-280 μΐη (measured as dry film thickness), 3 4 is achieved, the primer thus obtained being applied to copolymer resin dispersions or solutions. after complete drying, an elongation at break, It is already known to use facade paints on the 20 "C has the basis of a wide variety of plastics to be used. 6. The method according to claims 1-5, thereby s So more or less low-viscosity colored characterized in that the base paint as or colorless coatings or impregnating agents on the Additive based on aqueous or solvent-based systems _in0 , .. _nta , men with or without silicone resin additives (cf. DE-OS I ₁ UTODiSU ₁ ITe 23 52 242) in one or more work steps Antifoam agent and applied to 0-5 <Vfch '005% ^ ^e ' ^ ^en paint and coating materials burned P ¹ To is, · » _tem J ^ _811n J ₆ (J _{00n e} j _n permanently elastic colorless gliding a preservative contains the closing or bridging of hairline cracks, 7. The method according to claims Ibis 3, 5 and 6, pores, imperfections, holes and similar not achieved characterized in that the will be in the form of a 15. Often, when painting or Dispersion used topcoats as coatings only dry layer thicknesses up to approx. Additive 40 μηι achieved n = «~. <u_ u- η _n c <-. «Ζ. To surface seals, e.g. B. of concrete parts, 03Weight% b.s0.05Weight% _{m educate already} «/ ^ _DE . _AS , J ₀₉₅₈₉ ' a preservative and proposed to the 20, a base and a top layer Mixing of the finished topcoat up to 20 plastics onto the concrete parts to be sealed. Wt .-% of a matting agent, preferably bring in. This method can be used as a base layer In the form of a 10-30% aqueous dispersion of also an alkyl polyacrylate in the form of a solution micronized silica gels. in organic solvents or in the form of a 8. The method according to claims 1 and 2,4 to 6, 25 aqueous dispersion applied and after curing characterized in that in the form of an elastic or drying through a with plasticizer Solution used topcoat as an additional topcoat set on the basis of medium epichlorohydrin resin, polyester resin or polysilicon .. at, w our · ac consists of being overlaid. u ^ oew.-WDisASOew.- · «! _jo ^. _{W (] rde however firmly stentf that with this one} Plasticizers and processes only with a certain selection of those for the n * <- " at. ww tu. Base and top coat specified synthetic resins a up oew .- <*> to J trew. «To functionality can be achieved. Disadvantageous with Matting agent, preferably pyrogenic silica this method is further that the elongation at break acid, contained 35 the top layer is greater than the adhesion of the Base layer so that wrinkles form at the cracks in several cases cannot be avoided and that through the elastic adjustment of the top layer in combination with that in the layer «? provided The present invention relates to a method for 40 mineral fillers a colorless or matt Manufacture of elastic coatings or drying coatings that enhance the visual appearance Sealing of cracks, joints, imperfections and the like on buildings or building parts, using essentially unchanged can not be achieved a paint or coating material of can. high bond strength and high extensibility was the aim and object of the present invention under 45 Use of paint and coating known per se, therefore, to avoid the aforementioned disadvantages and processing devices, preferably using a method in which it is possible to use a of brushes, rollers or spray devices, in the form of permanently elastic coating or sealing of At least one base layer on the basis of one or more cracks, joints, flaws and the like. On structures or several polyacrylic acid ester dispersions applied 5 ° building parts with high elasticity and high and after drying with a top coat on the bond strength. In particular, it should be colorless Based on a synthetic resin dispersion or synthetic resin solution or an almost colorless or transparent coating Painted over or coated inside the and / or sealing can be achieved without affecting the visual Method is decided according to the invention as a primer coat appearance of the surface to be sealed medium or base coating material to change a colorless 55 dend, so that the existing structure and Permanently drying, structurally viscous, slightly preserved or essentially preserved fhixotropic plastic dispersion based on or remains. So that the permanently elastic coating or the several polyacrylic acid ester dispersions. Preferably, permanently elastic sealing is or remains very effective, se one or more acrylic burcester copolymers should be achieved that a coating thickness of dispersions with a copolyzing fraction of up to 30 to 60 greater than 140 μm, preferably greater than 200 μΐπ, % By weight is used that a certain composition is achieved. The coating or seal should tation and condition. After drying, water resistance continues to be good or poor nen will have a top coat or top coat on the water swellability. Based on one or more polyacrylic acid ester according to the invention it was found that this sions or solutions or a polyvinyl acetate dispersion. sion or solution, preferably on the basis of a or rens for the production of permanently elastic coating several acrylic acid ester copolymer dispersions or sealing of cracks, joints, imperfections or solutions and / or one or more Vinylace and the like on buildings or building parts solved or