DE2616682A1 - WOOD PROTECTION PROCESS AND MEANS FOR THIS - Google Patents

Description

The invention relates to improvements in wood preservation and in particular to the re-use of the compound of the formula

^CH ₃ -SO ₂ -N ~ s-cci_-cci ₉ F

N- (1,1,2,2-tetrachloro-2-fluoroäthylthio) -methanesulfonanllid / as a wood preservative.

This connection and its preparation are known, for example from GB-PS Nos. 1242265 and 1242266. From these descriptions it is also known that the compound I

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Bank details ι Bayer. Verelnibanlt MOnchen, Account 620 404 · Poitiehedckonlo ι Munich 370 44-802

shows activity against Eimeria tenella. It is also known that the compound I, in addition to an acaricidal activity, an activity against various pathogenic plant fungi, such as Rhizoctonia solani and Fusariura solani, and also an activity against the wood surface and Has fungi that discolour paint, such as Aspergillus niger and Penicillium sp.

It is known that because of the great differences between the individual mushrooms, it is common to use a remedy for one type of mushroom shows good activity, but poor or no activity with other mushrooms having.

It has now been found, surprisingly, that the compound I has a very high activity against wood-destroying fungi, e.g. against Coniophora cerebella, PoIyporus vaporarius and Merulius lacrymans. This activity is not just general in comparison to the activity of others known plant fungicides, but also compared to some well known and widely used Wood preservatives, such as TBTO (tributyltin oxide), PCP (pentachlorophenol) and dichlofluanid, are very high.

The invention therefore relates to a method of treatment of wood with the aid of a compound of the formula I and also a composition which is a for treating wood has a suitable shape to prevent or at least inhibit attack by wood-destroying fungi.

Suitable compositions according to the invention are prepared by converting the compound I into any of the Introduces liquids that are commonly used in the manufacture of wood preservative compositions. Preferred organic liquids in which the compound I is soluble in the desired concentration.

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Usually a liquid hydrocarbon or a mixture of liquid hydrocarbons is used. A liquid aliphatic hydrocarbon or a mixture of such aliphatic hydrocarbons or a mixture of such an aliphatic hydrocarbon or such aliphatic hydrocarbons with a proportion of aromatic hydrocarbons or related compounds is preferred. White spirit or kerosene or similar commercially available hydrocarbon fractions are particularly preferred. The concentration of the active substance in the liquid composition is usually between 0.1 and 10 wt. and preferably between 01 and 2 % by weight. However, the concentration is not critical. However, it should only be high enough that protection is achieved with the aid of the treatment chosen. The usual types of treatment can be used, which are described in detail in the technical literature. For example, detailed descriptions can be found in PP Kollmann, Wilfred A. Cote "Jr.," Principles of Wood Science and Technology ", Volume 1, Chapter 5, pages 136-157, Springer-Verlag, New York (1968), PP Kollmann, .Wilfred A. Cote Jr., Alfred J. Stamm, "Principles of Wood Science and Technology", Volume 2, Chapter 2, Pages 107 - Hl, Springer-Verlag, New York (1975) and "Ulimann's Enzyklopadie der Technischen Chemie", 3rd edition (1957), volume 8, pages 539 ff. If such a treatment is used, such as one of the various surface treatments (painting, dipping, etc.), wood juice displacement process (such as the Boucherie process), tank impregnation process (such as the Rüping r method or Rütger method), a concentration of the active substance in the above-mentioned range of 0.1-10% by weight will always be useful, while concentrations between 0.1 and 2% by weight are normally customary. Of course, it may be desirable to change the composition somewhat n, depending on the various factors, such as the type of wood, the use of the wood, the degree of

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desired protection and the treatment method (such as painting or impregnation with the help of Pressure), but a person skilled in the art can determine without any difficulty which compositions and which method are preferable.

The composition can optionally also contain an ingredient that helps bind the active ingredient and the wood. The addition of such a binder is known per se in the art. A wide variety of customary alkyd resin binders or linseed oil or other customary paint materials can be used. The concentration of such a binder can vary considerably as required, for example up to 10% by weight or more. A suitable composition for the treatment of wood is a liquid composition containing about M wt.% Of the compound I, 9 wt.% Of a conventional Alkydharzbinders (or a similar quantity of linseed oil) and 87 weight contains. $ Mineral spirits.

The invention is suitable for the protection of all types of wood that are subject to attack by wood-destroying fungi, such as spruce, pine, beech, etc., for example in Form of posts, stakes, boards, beams and all kinds of lumber.

The activity of the compound in question was investigated through activity tests against the wood-destroying fungus Coniophora.cerebella. It turned out to be two different Procedure used.

Test procedure 1

Slices of spruce wood, 7 x 1.6 χ 0.2 cm were 2 ^% A hours.

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dried at 103 ^° C. and then weighed.

A dilution series of M, 2, 1, 0.5, 0.25 and 0.125 pounds of the substance to be tested was then prepared as a solution in mineral spirits which contained 9% of an alkyd binder.

The impregnation was carried out by briefly immersing the wooden discs in the solution. The test disks were weighed. The intake should be about 100 kg of solution each- before .

After drying for two days. At room temperature, the disks were packed in steramide bags and by irradiation, preferably UV or GAMMA irradiation, sterilized.

Glass bottles containing 500 ml soil, which had been especially added to the growth of Coniphora cerebella with nutrients contained 3 hrs. At 120 ⁰ C were sterilized in an autoclave and then cooled.

The wooden discs were placed in the bottles, the bottom was inoculated with Coniphora cerebella, and then incubated for four weeks at 22 ° C. and 10% relative humidity.

After incubation, the disks were carefully brushed, then dried at 103 ° C. and weighed. The weight loss was calculated as a percentage of the initial weight.

Test procedure 2

Beech and spruce test samples were carefully tested with .25 fcigen Solutions of the compounds to be tested impregnated.

The samples were then placed in standard unsterilized soil

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introduced and ^{left to themselves at 22 0} C and 902 relative humidity.

After twelve weeks, the samples were taken from the soil, cleaned and dried. The weight loss was in weight? of the initial weight.

Example No. 1

Activity of the compound I in comparison with known wood preservatives.

Using Test Procedure 1, the following compounds were tested:

A compound I B PCP + diethylamine (molar ratio IU)

C PCP + TBTO (molar ratio 1: 1)

D dichlofluanid E 2,3-pichloro-1,4-naphthoquinone

Table no.

Connection by weight J active component

2% 1% 0.5 * 0.25 * 0.125% 0% 0%

A. 0.0 0 , 0 0.0 0.0. 0 »Ο 4th 18.9 33.0 B. 1.8 6th , 2 18.4 29.0 - - 19.8 40.4 C. 0.0 0 .0 0.0 3.6 18th , 0 > 20 20.7 31.9 D. 0 , 9 0.7 1.2 14th , 0 > 20 18.5 38.3 E. - 19th , 0 26.6 27.0 - - 18.8 37.9

The results mean weight * weight loss.

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Belsplel No. 2

The activity of Compound I was compared to well known antifungal agents.

Using Test Procedure 1, the following compounds were obtained tested:

Cl

Folpet.

Cl

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Captan

ci dichlofluanid

D:

Difolatan

NrCONH-Bu

COO-CH ₃

Benomyl

Thiabendazole

Connection I,

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Table No. 2

Compound by weight * Active ingredient

2% 1 * 0.5 * 0.25 * 0.125?

A. 6th 11 13th 18th > 20 > 20 B. H 18 · > 20 > 20 > 20 * 20 C. 1 1 1 1 14th > 20 D. 9 ? .1O 13th 18th > 20 > 20 E. - 6th 16 > 20 > 20 > 20 F. - 12th > 20 > 20 > 20 > 20 6th 0 0 0 0 0 9

The results are given in weight * weight loss.

Example No. 3

Using Test Procedure 2, those in Example 1 compounds mentioned were tested.

Only the samples impregnated with Compound I showed none Microbial attack and no weight loss. All other samples showed a weight loss ranging from 12 to more than 20 wt. *.

PATENT CLAIMS:

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Claims (9)

Claims 1.) A method for protecting wood against attack by wood-destroying fungi, characterized in that the timber with a cooperation · "'is treated translation, the compound N- (1,1,2,2-tetrachloro-2 -fluoroäthylthio) -methanesulfonanilid contains as the essential active ingredient. 2.) The method according to claim 1, characterized in that the wood at least on the surface or in a surface layer with a solution of the active ingredient in a hydrocarbon liquid is treated. 3.) A process according to claim 2, r ^ dadu eh in that the solution jden active ingredient in a concentration in the range of about 0.1 to about 10 wt.%. 4.) The method according to claim 3 »characterized in that the solution contains the active ingredient at a concentration ranging from about 0.1 to about 2 wt. 5 ·) Method according to claim 2, characterized in that the composition has a binder for the active ingredient. 6.) The method according to claim 5, characterized in that the binder consists of a paint material, namely an alkyd resin or a linseed oil. 609846/0990 7.) The method according to claim 5, characterized in that the composition contains the binder at a concentration ranging from about 2 to about 10 wt. *. 8.) Composition for use in the method according to claim 1, characterized in, that they contain the compound N- (], 1,2, 2-tetrachloro-2-fluoroethylthio) -menthanesulfonanilide as an essential active ingredient contains. 9.) Composition according to claim 8, characterized in that it is in one of the Claims 2-8 contains specified ingredients. PATENT LAWYERS DRAINS. H. FlNCKE. DIPL - ING. H. BOH * WU-INQ. ·. »TAEGEB. DB. r «r. oat. R. KNEISM. 609846/0990