COMPOSITION FOR A PASTY FILLER MATERIAL, PASTY FILLER, AND METHOD FOR PRODUCING A PASTY FILLER MATERIAL

Abstract

The invention relates to a composition for a pasty filler material (1), comprising an organic binding agent, fillers, and additives. Furthermore, the composition comprises perlites having an amphiphilic coating. The invention further relates to a corresponding pasty filler material (1), and a method for producing a pasty filler material (1). The inventive pasty filler has a lower tendency to post-thickening than other known pasty fillers.

Claims

1. Composition for a pasty filler material (1), comprising an organic binding agent, fillers, perlites, and additives wherein the perlites have an amphiphilic coating.

2. Composition according to claim 1, wherein the fillers are selected from the group consisting of calcium carbonates, calcium magnesium carbonates, calcium sulfates, and lamellar siliceous materials, or any combination thereof.

3. Composition according to claim 2, wherein the lamellar siliceous materials comprise kaolin of the illite group.

4. Composition according to claim 1, wherein the composition comprises 0.2 to 10% by weight of palygorskite.

5. Composition according to claim 4, wherein the composition comprises 2 to 40% by weight of perlites.

6. Composition according to claim 1, wherein the amphiphilic coating comprises alkoxy-modified alkylsilicone resins.

7. Composition according to claim 1, wherein the composition further comprises 0.1 to 0.5% by weight of an additive consisting of a blend of liquid hydrocarbons, modified fatty acid derivatives, nonionic emulsifiers, and silicone oil.

8. Composition according to claim 7, wherein the liquid hydrocarbons are selected from the group consisting of saturated hydrocarbons with the general formula C.sub.nH.sub.2n+2, where n=5 to 15 with straight or branched carbon chains and cycloalkanes composed of 5 and 6 member rings with the general formula C.sub.nH.sub.2n, and mixtures thereof.

9. Composition according to claim 7, wherein the modified fatty acid compounds are selected from the group consisting of fatty acid ester, fatty alcohols, alkoxylates, polyglycol-ethers, fatty acids, and mixtures thereof.

10. Composition according to claim 7, wherein the nonionic emulsifiers are selected from the group consisting of fatty alcohols, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, oleyl alcohol, and mixtures thereof.

11. Composition according to claim 7, wherein the silicone oil is selected from the group consisting of liquid polymerized siloxane with alternating silicone-oxygen atoms and organic side chains, wherein the side chains are attached to the tetravalent silicone centers comprising alkyl and phenyl groups and mixtures thereof.

12. Composition according to claim 1, wherein the composition further comprises modified celluloses, starches, biocides, or fungicides as additives.

13. Composition according to claim 12, wherein the starches are modified starches.

14. Pasty filler, made from the composition according to claim 1.

15. Method for producing a pasty filler according to claim 14, comprising a two-stage process that comprises homogenizing dry components, and adding the homogenized dry components to aqueous or water-dilutable components.

16. Pasty filler of claim 15, in the form of a physically drying spray filler.

17. Composition according to claim 4, comprising 1 to 4% palygorskite.

18. Composition according to claim 5, comprising micronized and expanded perlites with a particle size d98 of less than 200 m.

19. Composition according to claim 6, wherein the alkoxy-modified alkyl silicone resins comprises aminoalky-substituted polydimethylsiloxanes of the formula (C.sub.2H.sub.6OSi).sub.n, wherein n is from 30 to 300.

20. Composition according to claim 13, wherein the modified starches comprise a starch ether modified with alkylene oxides with the general formula C.sub.nH.sub.2n+1 O, where n=2 to 5.

Description

[0048] Further details and features of the invention will become clear from the following description in connection with the drawings in which

[0049] FIG. 1 shows an illustration of a card house structure of lamellar filler particles in an inventive embodiment of a pasty filler material; and

[0050] FIG. 2 shows a comparison of the viscosity increase 24 h after production of an example of the inventive and state of the art pasty filler.

[0051] FIG. 1 shows an illustration of a card house structure. Since kaolin has a plate-shaped morphology, due to the charge distribution, a card house structure can be formed by the platelets to level out defect sites in the surface to be coated and to reach a high application layer thickness without the filler material slipping off the substrate.

[0052] Table 1 shows a comparison of a state of the art sample 2 comprising micronized expanded perlites, however, the perlites being used without amphiphilic coating. Sample 1 is an embodiment of the invention and comprises micronized expanded perlites with an amphiphilic coating.

[0053] A lightweight pasty sprayable filler material having a composition according to the present invention provides for a homogeneous substance which still has comparably low shear stress at high shear rates.

TABLE-US-00001 TABLE 1 State of the Art Raw Material Chemical sample 1 sample 2 Raw Material Description g % % dolomite carbonate 840 48 49-50% powder 90 m/ Microdol A 520 Minugel FG palygorskite 46 3 1.5-3.5% Mica-Celia 125 muskovite Mica Sil-Cell 35.34 micronised expanded 5-8% Perlite Volite 200 H micronised expanded 90 5 perlites; surface Treatment (0.5%): silicone micro- emulsion (amino-alkyl- functional polydimethylsiloxane) Cellosize QP hydroxyethyl cellulose 0.4-0.6% 52000 (HEC) Walocel MK hydroxypropyl 7 25000 PFV methylcellulose (HPMC) Agitan 218 blend of liquid 2-2.5% hydrocarbons, modified fatty acid components, nonionic emulsifiers, small amounts of silicone Vinamul 3171 ethylene-vinyl acetate 80 5 0.1-0.4% copolymere (EVA) Biocide div. 2-methyl-2-H-isothiazolin-3- 4 0 on (MIT) and 1,2-benzisothiazol-3(2H)- one (BIT) water water 670 39 30-32% total kg batch 1736 100

[0054] FIG. 2 shows the viscosity increase (difference of viscosity 24 h after production and directly after production) of the state of the art pasty filler according to sample 2 in Tab. 1 and the inventive pasty filler, composition as sample 1 according to Tab. 1. Post-thickening, as indicated by the difference in viscosity, is reduced to about for the pasty filler according to the invention compared to the pasty filler according to the state of the art. Both, the pasty filler according to the invention and the pasty filler according to the state of the art, comprise micronized and expanded perlites. The perlites used in the inventive filler are treated with an amphiphilic coating, whereas the perlites used in the state of the art filler an amphiphilic coating is not apparent.

[0055] The amphiphilic coating was achieved with a silicone micro-emulsion comprising amino-alkyl functional polydimethylsiloxane.

[0056] A respective lightweight pasty spray filler material according to the present invention still has comparatively low shear stress at high shear rates. This enables a continuous material flow for an efficient spray application performance.