HU204548B - Vallcoating composition containing pretreated leather-fibres with polymere binding materials - Google Patents

Abstract

Polymer based aq. wall coverings contain (all pts.wt.): 15-35 polyvinyl-acetate-emulsion polymer, mixed with other optional polymers of 45-65% solids. 3-5 plasticiser, 10-25 opt. pretreated, leather fibre or comminuted leather, 15-25 inorganic filler pref. hydrated alumina, 15-25 pigments, 0.1-0.5 fungicide and remainder water.

Description

Scope of the description: 4 pages

HU 204548 Β

BACKGROUND OF THE INVENTION The present invention relates to a polymer based wall coating material composition which adheres well to a surface and can be produced in a wide range of colors.

In contrast to coatings for wall surfaces, especially facades, it is a requirement that the substrate be well moistened, penetrate deep into the pores and have good adhesion.

In case of outdoor use it is very important to withstand weather conditions, heat fluctuations and rainfall. 10

It is also important that the coating does not contain flammable or explosive solvents.

It is important that the coating formed therein be waterproof and waterproof and yet sufficiently breathable and vapor permeable, and the elasticity of the coating 15 formed is not negligible.

The above requirements are best met by pigmented aqueous dispersions containing acrylate polymers. (Kovács L .: Varnish and Paint Pocket Book, Technical Publishing House, Budapest, 1982, 5238-541, 1109-1111)

Dr. Kovács Lajos: Aqueous Polymer Dispersions, Technical Publishing House, Bp. 1986. p. 215. describes plasters and wall paints containing aqueous polymer dispersions.

The wall coating compositions described in the above books contain pigments, mineral fillers and additives in addition to an aqueous dispersion of polyvinyl acetate or polyacrylate.

A disadvantage of the known products is that their adhesion and in many cases their resistance to vapor diffusion (eg in systems containing 30 significant amounts of filler) are unsatisfactory.

It is an object of the present invention to provide a wall coating composition which has improved adhesion strength and vapor diffusion resistance compared to prior art and also allows the utilization of waste material.

In our experiments, it has been found that the above object can be achieved if 40-60% by weight aqueous dispersion of 15-35 parts by weight of 50-60% by weight of dry polyvinyl acetate or polyacrylate, 15-25. 15 parts by weight of inorganic mineral fillers 15 to 25 parts by weight of pigment, optionally 0, 5, 5 parts by weight of fungicide, 3 to 5 parts by weight of a plasticizer and 10 to 25 parts by weight of pre-treated skin. 45

The pretreated leather fiber is prepared by adding 6-8 mm of skin chips to a hammer mill and 0.5 to 3 weight percent of a nonionic surfactant, 0.1 to 0.2 weight percent of a fungicide, and 1 to 8 weight percent of the weight during milling. After mixing 50% of a 40% to 60% by weight aqueous dispersion of polyvinyl acetate, the mixture is shaken for 10-15 minutes and surface treated. This results in a surface treated leather fiber having a size of 0.1 to 3.0 mm.

Leather fibers, scraps of leather waste have been widely used to replace leather, for example in the manufacture of 55 shoe soles.

Such a procedure is described in Przegl. Skorzany 1983,

38 (10) p 270-2.

Also, a composition containing skin powder 60 has been used as soundproofing material

German Patent Publication No. 3,413,877 discloses a composition comprising a urea-formaldehyde resin, a blowing agent, a hardener and a powder.

In our experiments, it has been found that using polyvinyl acetate or a mixture of 10-30 wt% poly (acrylate) thereof as a binder produces a mixture of leather fiber and a known additive to produce a wall coating material with excellent properties.

The excellent adhesion properties of the wall coating material and its good coverage and vapor diffusion resistance can be achieved by pretreating the skin fiber in the manner described hereinabove.

The invention thus relates to a polymer based wall coating material composition comprising 15-35 parts by weight of a 40-60% w / w dispersion of polyvinyl acetate having an average molecular weight of 50000-250000 or 10-30% by weight of an polyacrylate having an average molecular weight of 40,000-120,000. a mixture of 15 to 25 parts by weight of an inorganic mineral filler, 15 to 25 parts by weight of a pigment, 3 to 5 parts by weight of a plasticizer, optionally 0.1 to 0.5 parts by weight of a fungicide, plus 100 parts by weight of water and additives.

The composition is characterized in that 100 parts by weight of a polyvinyl acetate / polyvinyl acetate / polyacrylate binder are 10-25 parts by weight of 0.1-3.0 mm, 0.5-3% by weight non-ionic. surfactant, from about 0.1% to about 0.2% by weight of a fungicide and from about 0.5% to about 8%, by weight, of an average molecular weight of about 50,000 to about 16,000,000 of dry polyvinyl acetate dispersion.

Preferably, the non-ionic surfactant is a polyoxyethylene derivative of sorbitan ester (Tween products from ICL USA).

The fungicide used is any fungicide which can be incorporated into an aqueous dispersion, preferably p-dichlorobenzene or p-chloro-m-cresol.

As inorganic mineral fillers, for example, alumina hydrate may be used; TiO ₂ , iron oxide red can be used.

The plasticizer is preferably dibutyl phthalate.

The average molecular weight of the polyvinyl acetate used as the polymer binder is preferably between 50,000 and 600,000. The acrylic acid methyl ester polymer is used as the polyacrylate. Its average molecular weight is preferably 20000300000.

The wall coating composition according to the invention has the advantage of excellent adhesion, good vapor diffusion resistance and good coverage.

A special advantage of the composition is that the waste also enables the recycling of leather fibers and chips.

The following examples illustrate the composition of the invention.

l.példa

100 parts by weight of 8 mm average particle size chips are added to a hammer mill. 1.5 parts by weight of Tween 60 (a polyoxyethylene derivative of sorbitan stearate, manufactured by ICI, USA), 0.3 parts by weight of p-dichlorobenzene fungicide in 30% by weight of ethyl 2 are added.

HU 204 548 Β and a 50 weight% aqueous dispersion of 5 parts by weight of 160,000 average molecular weight polyvinyl acetate

The mixture was shaken for 15 minutes.

The average particle size of the resulting surface-treated leather fiber

0.3 mm.

Example 2

Mixing was charged with 20 parts by weight TiO ₂ pigment, 20 parts by weight of alumina hydrate, treated with 10 parts of Example 1 hide fibers, 3 parts of dibutyl phthalate and 10 parts of 50% solids polyvinyl acetate (the polymer average molecular weight: 250,000; dispersion viscosity at 20 ° C 60 mPaxs).

The mixture was homogenized and 37 parts by weight of water were added in several portions.

A white coating material is obtained.

Examination of the composition gives the following results.

specific Parameter test method Drying time (hours) 1st grade 7th grade max. 2 max. 24 MSZ KGST 144 2 Repaintability (hours) min. 24 MSZ 9640/24 Coverage capacity (kg / m ² ) 1.4 MSZ 9650/22 Moisture diffusion resistance m ² sxPa / g 2xl0 ^{4 * 6} MSZ 9640/50 Bonding strength (MPa) on concrete 1.7 ÉMISZ264

Example 3 Measure the Characteristics of the Wall Coating Material So Produced Example 2 is repeated, but also in place of the leather fiber.

alumina hydrate is added.

specific Parameter test method Drying time (hours) 1st grade 7th grade max. 2 max. 24 MSZ KGST 144 2 Repaintability (hours) min. 24 MSZ 9640/24 Coverage capacity (kg / m ² ) 1.0 MSZ 9650/22 Moisture diffusion resistance m ² sxPa / g 2.9x10 ⁶ MSZ 9640/50 Bonding strength (MPa) on concrete 0.8 ÉMISZ264

From the above data, it is apparent that the non-fibrous coating material has poorer usability characteristics.

Example 4

The apparatus of Example 2 was charged with 15 parts by weight of 25 parts by weight of alumina, 55 parts by weight of polyvinyl acetate 55 by weight, and 6 parts by weight of 50 parts by weight of an aqueous acrylic methyl ester (average molecular weight of polymer). 120,000, Viscosity of dispersion: 45 mPaxs) 2 parts by weight of dibutyl phthalate plasticizer, 0.2 parts by weight of 4-hydroxybenzene acid-60-methyl ester fungicide, 23 parts by weight of the fiber of Example 1.

The mixture was homogenized and mixed with 8.8 parts by weight of water.

The finished product is used as a plaster. It has the following features:

(For the spreadsheet! See next page.)

HU 204548 Β

specific Parameter test method Drying! time (hours) 1st grade 7th grade max. 2 max. 24 MSZ KGST 1442 Repaintability (hours) min. 24 MSZ 9640/24 Coverage capacity (kg / m ² ) 1.2 MSZ 9650/22 Diffusion resistance m ² sxPa / g 2, lxl0 ^he MSZ 9640/50 Adhesive strength (MPa) on concrete 1.58 ÉMISZ264

PATENT CLAIMS

Claims (3)

PATENT CLAIMS L Polymer based wall coating composition comprising 15-35 parts by weight of a 40-60% by weight dispersion of polyvinyl acetate or a mixture thereof with 10-30% by weight of a polyacrylate dispersion, 15-25 parts by weight of an inorganic mineral filler, 15-25 parts by weight. It consists of 25 parts by weight of pigment, 3-5 parts by weight of plasticizer, optionally 20 to 0.1 parts by weight of a fungicide, plus 100 parts by weight of water and additives, characterized in that the polyvinyl acetate and polyvinyl acetate ) and 100 parts by weight of a polyacrylate solid with 10 to 25 parts by weight of 0.1 to 3.0 mm, 0.5 to 3% by weight of non-ionic surfactant, 0.1 to 0.2% by weight of fungicide and 0.5 -8% by weight, comprising 40 to 60% by weight, of dry, fibrous skin fiber treated with an aqueous dispersion of polyvinyl acetate having an average molecular weight of 50000 to 160000. (Priority: 11/04/1991) Composition according to claim L, characterized in that it contains as a nonionic surfactant a polyoxyethylene fiber moiety. (Priority: 11/04/1991) Composition according to claim 1, characterized in that the fungicide is p-dichlorobenzene or 4-hydroxybenzene acid methyl ester.