PL149886B2 - Transparent paint for protection of wood - Google Patents

Description

^RIVER ™ T ^A Patent

149 886

PATENT OFFICE OF THE RP

Additional patent to patent no. - Pending: 87 06 15 (P. 266320)

Priority - Application announced: 88 06 09

Patent description published: 1991 04 30

Int. Cl. ⁴ C09D 3/393

B27K 3/52

Int. Cl. ⁵ C09D 3/393

B27K 3/52

Creators of the invention: Zbigniew Rombel, Seweryn Bojanowicz, Jerzy M. Nowak

The holder of the patent: Zakłady Farb "POLIFARB-OLIVA", Gdynia (Poland)

Transparent paint for wood protection

The subject of the invention is a transparent paint for the protection of wood against the damaging effects of weather conditions and biological environmental factors, especially for the protection of wooden building structures.

The previously known paints for wood protection are a composition of organic film-forming binders, inorganic and organic pigments, auxiliaries and solvents. These paints may also contain biologically active substances that inhibit the growth of wood-destroying fungi and bacteria.

The patent specification No. 103 345 describes the preparation of a coloring fungicide for impregnating wood, which contains organic pigments being complexes of azo, rhodamine, phthalocyanine, azomethine compounds with cobalt, chromium and copper in the amount of 0.2-4.0% by weight, resins drying, for example phthalic resin modified with linseed oil, in an amount of 2-30 wt.%, mineral or vegetable oils in an amount of 1-7 wt.%, a toxic base, for example pentachlorophenol in alpha-chloronaphthalene, and organic solvents.

Also in the patent specification No. 124,422 there is given a coloring fungicide for the surface impregnation of wood, which contains inorganic pigments with a degree of micronization preferably below 10 microns in an amount of 0.2-10 parts by weight, a wetting agent in an amount of 0.1-0.3 parts by weight , a toxic base in an amount of 0.5-10 parts by weight, film-forming substances, preferably of the natural oil-modified polyester resin type, in an amount of 5-30 parts by weight and an anti-fouling additive in an amount of 0.2-1.5 parts by weight. The disadvantage of these known agents is their relatively low resistance to water penetration and environmental damage.

The subject of the invention is the formulation of a paint having a high efficiency in protecting wood against the damaging effects of weather conditions and biological environmental factors, as well as giving the wood an aesthetic, natural appearance by making its rings visible.

Transparent paint based on an organic binder, biologically and surfactants, pigments and solvents is characterized according to the invention by the fact that it contains dispersed, oxidized polyethylene and / or polypropylene waxes with a molecular weight of 500-10000, preferably 1000-5000 and with the oxidation state determined by the number of kwa

149 886 by 1-30 mg KOH / g in the amount of 0.1-20% by weight in relation to the organic binder, colloidal silica with agglomerate particle size 1-20 micrometers and a bulk volume of 500-2000 ml / 100 g in the amount of 0.1- 15% by weight, based on the organic binder, surfactants in an amount up to 0.1% by weight, based on the organic binder, and inorganic and / or organic pigments up to 25% by weight, based on the organic binder, the weight ratio between oxidized polyethylene and / or polypropylene waxes and the colloidal silica is from 1:10 to 10: 1, preferably from 1: 2 to 2: 1. The dispersed, oxidized waxes contained in the paint provide the coating with hydrophobic properties while maintaining good adhesion to the substrate and interlayer adhesion. On the other hand, thanks to the interaction of dispersed waxes with colloidal silica, the coating acquires a specific matte appearance and, at the same time, thanks to its low pigmentation, the coating allows the natural grain pattern of the protected wood to be preserved. Electrically neutral and cationic or anionic compounds such as, for example, sulphonated oils, alkylsulphonates, long-chain / fatty / amine polycarboxylic acid salts, quaternary ammonium salts, condensation products of fatty acids with amino alcohols, polyoxyethylene alcohols and fatty acids may be used as surfactants. , polyalkyl ethers.

Surfactants interact with oxidized waxes, positively influencing the process of dispersing pigments and silica, and the stability of the paint's colloidal system during storage and application.

Inorganic and organic pigments as well as mixtures thereof can be used for pigmentation.

A wide variety of toxic compounds can be incorporated into the paint, ranging from pentachlorophenol to complex chemicals such as, for example, copper 8-hydroxyquinolinate.

Generally speaking, the production of paint consists in special preparation of the binder and then dispersion of pigments in it with devices known in the paint and varnish industry and the equalization of all components of the product. The preparation of the binder consists in dispersing wax and silica in a solution of the binder with the addition of a surfactant until a fine, stable colloidal suspension is obtained. The process of preparing the organic binder can be carried out at room temperature using high shear devices such as high-speed disk agitators and ball mills, or at elevated temperatures with intensive mixing followed by controlled cooling.

The paint according to the invention shows a high efficiency of wood protection in various weather conditions, and so, for example, samples in the form of softwood planks secured with a double layer of paint did not show any aging changes and biological damage after two years of exposure in suburban atmosphere conditions.

Example I.

Phthalic resin modified with linseed oil / 60% solution in gasoline / 51.00 pcs. weights, Iron yellow 1.20 5 » Iron red 1.80 > » Soot 0.10 Colloidal silica 2.00 5? Oxidized polypropylene wax 2.00 Fungicide, pentachlorophenol 1.00 99 Lead Siccative, 12% Pb 1.40 99 Cobalt Siccative, 3% Co Surfactant, amine salt 0.40 fatty acid and polycarboxylic acid 0.03 99 Anti-skinning agent, cyclohexanone oxime 0.30 99 Gasoline for varnishes 38.77 99

100.00 parts wt.

149 886

Example II.

Urethane soybean castor oil / 50% solution in petrol for varnishes / 54.00 part wt. Oxidized polyethylene wax 3.50 Iron red 1.30 11 Soot 0.20 ii Pigment Yellow G. 1.25 Colloidal silica 0.50 Surfactant, oleate fatty polyaminoamide 0.02 Fungicide, a derivative of Benzimidazole 1.50 > 1 Manganese Sicily, 6% Mn 0.70 »1 Cobalt Siccative, 3% Co 0.30 Anti-skinning agent, cyclohexanone oxime 0.30 11 Gasoline for varnishes 36.43

100.00 "

Claims (1)

Patent claim Transparent paint for wood protection based on organic binders, biologically and surfactants, pigments and organic solvents, characterized in that it contains oxidized polyethylene and / or polypropylene dispersed waxes with a molecular weight of 500-10,000, preferably 1,000-5,000 and with the oxidation degree specified by the number acidic 1-30 mg KOH / g in the amount of 0.1-20% by weight in relation to the organic binder, colloidal silica with an agglomerate size of 1-20 micrometers and a bulk volume of 500-2,000 ml / 100 g in the amount of 0.1-15% by weight based on the organic binder, a surfactant in an amount of up to 0.1% by weight based on the organic binder and inorganic and / or organic pigments in an amount up to 25% by weight based on the organic binder, the weight ratio between oxidized polyethylene waxes and / or polypropylene and colloidal silica is from 1: 10 to 10: 1, preferably from 1: 2 to 2: 1.