DE2645031C3 - Coating agent containing methylcellulose - Google Patents

Description

The invention concerns a methyl cellulose and approx Coating agent based on weight percent air-drying or modified natural oil of plastic dispersions.

From US-PS 32 34 039 is a wood coating agent known based on latex copolymer, which is used as a primer. After air drying a latex top coat is applied in a second step.

DE-AS 15 19 178 and US-PS 32 14 398 and 30 33 808 relate to coating agents on the basis of plastic dispersions with oils and thickeners.

Coating agents based on plastic dispersions with thickeners are also from GB-PS 11 50 283.8 88 969, US-PS 13 75 752 and the DR-PS 13 75 752 known, the latter also proposing methyl cellulose as a thickener.

Finally, there are already coating agents based on plastic dispersions with air-drying ones or modified natural oils known, e.g. B. from US-PS 33 32 899 and the reference: BASF »Plastic dispersions / plastic solutions«, edition 11/61, pages 103-110.

These known coating agents solve problems such as good adhesion to the adhesive base, the Achieving weather-resistant protection and quick drying to cover several coats in a small amount To be able to apply time interval.

The object of the present invention is to provide a coating agent of the type mentioned at the beginning create, which contains a primer, which immediately after application in the to be coated Material diffuses into it, so in a single process step the primer and the top coat to be able to make.

According to the invention, this object is achieved by that in the coating agent of the type mentioned, the content of methyl cellulose 0.1 to 0.3 percent by weight.

With the invention the advantage is achieved that the primer is due to the only slight Retaining forces in the coating agent from this dissolves and migrates into the substrate, so that a Effective primer is achieved with subsequent curing of the coating agent to create a durable To create top layer. For the first time it is possible to prime and top coat in one operation to raise. The coating agent can be a dispersion paint, a plastic dispersion adhesive (Construction adhesive) or a finished plaster. The use of the new coating agent not only saves one entire work process, but also the waiting time between the previously necessary multiple application processes. The new coating agent is overall cheaper to manufacture and process there are no harmful or flammable vapors.

The lower the proportion of methyl cellulose, the more The primer can more easily separate from the coating agent and into the substrate migrate. Last but not least, the capacity of the subsoil is responsible for the size of this proportion essential.

ίο All natural, modified or synthetic products are used, which allow diffusion and separation from the Allow glue, plaster or paint and harden after deposition in the substrate. The hardening isl a process that takes place either through oxygen or carbon dioxide in the air or through pure The primer emulsion or solution dries out or by changing the pH value in the Underground is made possible.

The natural fatty oils include semi-drying ones and drying oils such as B. linseed oil, soybean oil, wood oil, castor oil, tall oil, castor oil (DCO) coconut oil, Oiticicca oil, corn oil, rapeseed oil, cottonseed oil, perilla oil, Poppyseed oil, nut oil, hemp oil, etc. The following modified natural oils are suitable: varnishes, dehydrated oils, isomerized oils, styrenated oils, cyclo oils, gel oils, uretane oils, epoxy resin esters, maleic oils, acrylated oils, Cyclopentadiene adducts and alkyd resin modifications. Natural resins are z. B. shellac, cellulose ether, Cellulose esters, bitumen and their modifications as well as rosin rivals. As a synthetic primer are for example acrylate resins, epoxy resins, melamine resins, Disocy-'natharze, vinyl acetate resins, alkyd resins, Water glass, siliconates used.

The primers mentioned in detail above are either in pure form, in emulsion form or in dissolved form in the coating agent contain.

example 1

The following recipe results in an emulsion paint Contains 10% primer.

15.0% by weight acrylic acid ester copolymer

13.0 wt% water

0.1 wt% methyl cellulose 15,000 xp

0.2 wt% polyphosphate

0.1% by weight defoamer (mixture of

natural oils with silicone)

0.1% by weight of 4-chloro-3-methylphenol

0.2 wt% xylene

8.0 wt% titanium dioxide

0.3% by weight ammonia conc.

53.0% by weight calcium carbonate,

1 -20 μm grain size

10.0 % by weight of linseed oil varnish
100.0

From the above recipe, water and polyphosphate and defoamer as well as 4-chloro-J-

bo methyl-phenol and titanium dioxide for three minutes mixed. Then methylcellulose is added as a thickening agent and ammonia and about mixed for four minutes. Acrylic acid ester copolymer is then mixed in. Then comes Cal / .iun Karbo-

b5 nut added, again with good mixing takes about three minutes. Finally, linseed oil and xylene are added. The whole thing will then ready mixed for about 15 minutes.

The result is an emulsion paint that will contain a sufficient amount of lubricant If the mass is painted, sprayed or rolled on in a conventional manner, the primer penetrates in the underground

Example 2

The following recipe results in a finished plaster which, as in Example 1, has approx. 10% priming contains medium. to

15.0 wt
0.1 wt
0.1 wt
0.2 wt

0.1 wt
03 wt
6.0 wt
0.2 wt
3.0 wt.

3.0 wt.
47.0 wt.
10.0 wt.

5.0 wt.
10.0 wt.

% Acrylic ester copolymer% methyl cellulose 15,000 xp% polyphosphate
.-% defoamer (mixture of

natural oils with silicone) .-% 4-chloro-3-methyl-phenol .-% ammonia conc.
.-% titanium dioxide
% Xylene
% Calcium carbonate,

1 -20 μm grain size% calcium carbonate,

1 -200 μm grain size% calcium carbonate,

40-350 μm grain size% calcium carbonate,

1-2 mm grain size% water
% Linseed oil varnish

Work instruction

15th

20th

25th

30th

Water, polyphosphate, defoamer, 4-chloro-3-methyi-phenol, Mix the titanium dioxide for approx. Three minutes. Then add methyl cellulose and about a minute Mix. Then add acrylic acid / polymer copolymer and ammonia and mix for approx. Four minutes. Then mix in xylene and linseed oil varnish. Then mix in all calcium carbonate types and 15 Ready minutes.

This finished plaster is either sprayed on in a known manner or drawn on with the eaves cl. That With this recipe, primer splits off very quickly from the finished plaster and diffuses in the underground. After hardening, a good bonding bridge to the finish plaster is created. Any Loose particles or dust on the substrate are bound by the primer. The primer has a water-barrier property, but enables the formation of a water vapor diffusion compensation layer.

Example 3

The following recipe results in a construction adhesive with 10% linseed oil varnish as a primer and a portion of the thickener of 0.1%.

15.0% by weight vinyl acetate maleic acid ester
10.0% by weight of linseed oil varnish

0.1 wt% polyphosphate

0.1% by weight methyl cellulose 10,000

1.5% by weight of asbestos fibers
10.0 wt% water

0.1% by weight defoamer (mixture of
natural oils and silicone)

0.1% by weight of 4-chloro-3-methyl-phenol

0.2 wt
62.9 wt
100.0

% Ammonia 25%

% Limestone powder 0 - 500 μΐπ

Work instruction

Water, polyphosphate, defoamer, 4-chloro-3-methyl-phenol, Mix the asbestos fibers for about three minutes. Add methyl cellulose and ammonia and about four Mix for minutes. Then mix in vinyl acetate / maleic acid ester and linseed oil varnish. Then limestone flour enter and mix for approx. 15 minutes.

The construction adhesive produced according to this recipe can be used as usual with the trowel or with the Notched trowel can be applied. The primer immediately goes into the substrate and hardens together with the setting of the glue. The suction capacity of the subsurface is reduced and achieved a good bond with the construction adhesive.

The recipes for paints, plasters and construction adhesives can be modified by either the The raw material base is different, or the grain size of the fillers can be changed to create different structures or to achieve processing capabilities, d. H. with the usual processing equipment such as Traufei, Trowel, brush, spatula, roller or spray equipment.

However, it is essential for all recipes that a primer is either pure or as described is added in emulsion form or in solution and only so much of the thickener methyl ^ ellulose is included that a diffusion of the primer is guaranteed.

The linseed oil varnish specified in the recipes can be replaced by pure natural oil. z. B. wood oil can be replaced without that a deterioration in the primer effect occurs.

Claims (1)

Claim: Methyicellulose and approx. 10 percent by weight air-drying or modified natural oil containing Coating agents based on plastic dispersions, characterized in that that the content of methyl cellulose is 0.1 to 0.3 percent by weight.