FI59747B - CONTAINING AV ENVIRONMENTAL SKYDDSAEMNESBLANDNING FOER FOERHINDRANDE AV FOERDAERV AV FUKTIG TRAE SAERSKILT STOCKAR OCH SAOGVIRKE GENOM TRAE MISSFAERGANDE SVAMPAR - Google Patents

Description

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Patent meddelat ^ (51) K ».ik? /Int.ci.3 B 27 K 3/50 // A 01 H 47/28, 33/12 FINLAND - FINLAND (21) totnttlhik.mu * -fWunrfknlng 17 ^ 8 / 72 (22) Hak «ml * pilvt - Awöknlng» d »g 20.06.72 (23) AlkupUvl —GlMghatsdag 20.06.72 (41) Become Public - Bllvit offentllg 02.01.73

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Patent and registration authorities Amttktn utiagd och uti.sk rift tn publicarad 30.06.81 (32) (33) (31) Pyydetty stuelkeu · —Begird priority 01.07 · 71

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2132701.5 (71) Desovag-Bayer Holzschutz GmbH, Ross-Str. 32, 4 Dusseldorf 32, Federal Republic of Germany-Förbun dsrepubliken Ty skland (DE) (72) Gustav Buchvald, Krefeld, Helmut Hinterberger, Rheinberg, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7 * 0 Oy Borenius & C: o Ab (5 ^ +) Use of a water-soluble preservative mixture to prevent contamination by damp wood, in particular logs and sawn timber, by wood-staining fungi

The present invention relates to the use of an aqueous solution of a mixture of thiourea and quaternary ammonium compounds as a preservative against the contamination of moist wood, in particular logs and sawn timber, by the action of wood-staining fungi. In particular, the invention relates to the use of a thiourea agent and benzyldimethylalkylammonium chloride as a wood preservative. Fresh wood, especially freshly felled logs or freshly sawn lumber, is often plagued by wood-staining (bluing) fungi in a humid environment, which reduces the value of the wood.

Therefore, it is necessary to perform a chemical protective treatment. Aqueous solutions of sodium phenolates, mainly sodium pentachlorophenolate, have long been used for this purpose. Treatment with a solution of approx. 5% should take place immediately after sawing, as the protective effect extends only to the surface. If the deeper layers have already had time to become infected, the fungus can continue to grow inside the wood. In this case, the surface of the wood remains clean, but there is an undesirable discoloration (internal blueing) inside the wood.

In addition to bluetongues, various species of insects, especially those of the genus Lyctus, can also damage timber that is 2,57947 starchy. This deterioration, which occurs especially in limba, abach and similar tropical tree species, also leads to a reduction in the value of the timber.

The object of the present invention was thus to find a new, more effective preservative or wood preservative mixture. In this case, it was found by extensive experiments that several known fungicidal and bactericidal compounds as well as most of the wood preservatives known per se are not suitable or only with little difficulty for this specific field of application.

Thus, silicofluorides, which are good wood preservatives per se, are unsuitable due to their insufficient potency in this area. Fluoro-chromium salt mixtures used as wood preservatives cause additional discoloration of the wood without sufficient prevention of fungal pollution. Some wood preservatives and mixtures, as well as fungicides and bactericides, absorb insufficient amounts of weight in the wood treatment or adhere only to the outer layers without penetrating deeper, while others are washed away to such an extent that a significant loss of power can occur during outdoor storage. Thus, for example, quaternary ammonium compounds known as fungal bactericides were also studied in outdoor air experiments, e.g. trialkylammonium halide-type, and a significant decrease in potency was found to be associated with increasing blueing.

Thioureas and their derivatives, which are described, for example, in U.S. Pat. No. 2,886,776 and others, were also studied as wood preservatives. However, the use of thiourea produced an improvement in that, when used in large quantities, internal bluing can be prevented due to better penetration. In practice, at standard dosages up to 5% of the active ingredient, insufficient protection was obtained. Higher concentrations also occur when trees are stored outdoors when stored on the surface due to loss of active ingredient on the surface.

A fungicide known from German application 1,567,097, which consists of an active compound mixture containing 95 to 99.95% by weight of thio-urea and 0.05 to 5% by weight, preferably 0.1 to 1% by weight - a small addition of a substance acting on the surface tension was also investigated in the context of the present invention. The values obtained, which were 59747 3, e.g. when alkali or ammonium salts of sulphonated fatty acids or alcohols or amines of fatty acids or ammonium salts or amines of sulphonated long-chain hydrocarbons were used in addition to thioureas, were identical or comparable to those obtained with pure thiol. without additives for surface tension agents.

It was therefore an object and object of the present invention to provide a wood preservative composition which can be used effectively to prevent spoilage by wood-staining fungi on moist wood, in particular logs and lumber, and thus has a high potency against such fungi. When in practice it is required that the wood be treated with aqueous solutions, the active ingredient mixture or its components should be water-soluble or at least partially water-soluble, on the one hand very penetrating to the wood and finally also retaining its effectiveness in the open air.

According to the invention, it has been found that by using a mixture of 70 to 93% by weight of thiourea and 7 to 30% by weight of one or more quaternary ammonium compounds, such as benzyldimethylalkylammonium chloride, in aqueous solution, on wet wood, in particular logs and lumber handling, prevents wood spoilage by wood staining.

According to a particularly preferred embodiment, the wood preservative is used as an aqueous solution in which 1.5 to 10% by weight, preferably 2 to 4% by weight, of the wood preservative is dissolved. Ready-to-use preservative solutions are prepared either just prior to treatment from individual ingredients or preservative mixtures or can also be supplied directly as a saline mixture, concentrate or ready-to-use solution. A mixture of preservatives containing 8 to 15% by weight of benzyldimethylalkylammonium chloride and 92 to 85% by weight of thiourea proves to be particularly advantageous when used for the treatment of moist wood and for the control of wood-polluting fungi.

\ 59747 4

Example 1

Mixtures of solution Tiovirt- Tiov urea with BMAC concentration sa-substance_BMAC 1 7 0: 30_80: 20_90: 10_95: 5 1.5% 5 311 15 2.0% 4 ... 5 3 1 1 0 3 ... 4 2.5% 4 2 0 0 0 3 3.5% 4 1 ... 2 0 0 0 2 ... 3 4.0% 3 ... 4 1 0 0 0 2 5.0% 3 00001 7 .0% 1 ... 2 - - 9.0% 0 _____

Example 2

Mixtures of solution Tiovirt- Tiov urea with BMAC concentration sa-substance_BMAC 2 8 0: 20_90: 10_95: 5_ 1.3% 5 3 ... 4 2 2 4 1.8% 5 2 ... 3 1 .. .2 1 2 ... 3 2.5% 410 0 1 ... 2 3.5% 4 1 0 0 1 ... 2 4% 3 ... 4 0.. .1 0 0 1 5% 3 0 0 0 1

The experiments were performed with the G. Schulz disk disc test described in Zeitschrift fiir angewandte Botanik _24 (1 951), 1. It means: 0 = not bluish 1. . . 4 = increasing blueing 5 = fully bluish BMAC 1 = benzyldimethylalkylammonium chloride (60% C 1-4 in alkyl and 40% C 1-4 alkyl) BMAC 2 = benzyldimethylalkylammonium chloride (alkyl = C 1-4)

However, the results of Example 2, and in particular Example 1, show that in order to completely prevent bluing in the wood disc test, the optimally effective weight amounts are as follows: 5 5974?

Thiourea 9%

Quaternary base 1 5%

Thiourea + quaternary base 1 2 ... 2.5%

Quaternary base 2 4%

Thiourea + quaternary base 2 2.5%

It should be noted that, as such, the more potent component, the quaternary base, provides the optimum power gain in the mixture of the invention and at a 10% mixture ratio. Increasing the proportion of quaternary base up to 30% causes a similar power improvement, however, the optimal effect of the 1: 9 mixture is not completely achieved.

Example 3

The laboratory experiments were extended with the following outdoor experiments: freshly sawn boards, dimensions 2 x 15 x 150 cm, were briefly immersed in preservative solutions and stored, separated according to the preservative, with spacers with or without a saw blade.

The experiments were performed in terms of season and weather under conditions conducive to bluing. The evaluation was performed as shown in Example 1.

Freely

Outdoor tests_Covered_exposed to 5% thiourea 3 5 7% "" 0 ... 1 2 ... 3 9% "" 0 1 2.5% BMAC 1 3 4 2.5% mixture 90:10 0 0

If, in addition to protection against bluetongue infections, it is also desired to provide protection against the damage of wood-destroying insects, a water-soluble phosphoric acid ester or phosphonate-type insecticide can be added to the mixture or its solution. In this case, it is a particular advantage that the mixture of thiourea and benzyldimethylalkylammonium chloride according to the invention is neutral in its reaction so that no saponification of the phosphoric acid ester or phosphonate takes place.

Claims (5)

6 59747 In this particularly preferred embodiment, 20 to 60 parts by weight, preferably 30 to 40 parts by weight of a water-soluble, insecticidal phosphonate ester, a mixture of 100 per part by weight. Phosphates may contain amide and hydroxyalkyl groups. In these application examples, the insecticidal activity of the water-soluble preservative mixture is increased. Use of an aqueous solution of a mixture containing 70 to 93% by weight of thiourea and 7 to 30% by weight of one or more quaternary ammonium bases, such as benzyldimethylalkylammonium chloride, as a preservative against moisture from wood-staining fungi to prevent pollution of wood, especially logs and sawn timber. Use according to Claim 1, characterized in that the mixture is dissolved in water in an amount of 1.5 to 10% by weight, preferably 2 to 4% by weight. Use according to Claims 1 and 2, characterized in that the alkyl group of benzyldimethylalkylammonium chloride is a long-chain alkyl group having 10 to 18 carbon atoms. Use according to Claims 1 to 3, characterized in that the quaternary ammonium base is a mixture of benzyldimethylalkylammonium chlorides, one of which contains an alkyl group having 10 to 14 carbon atoms and the other a group having 15 to 18 carbon atoms. carbon atoms. Use according to Claims 1 to 4, characterized in that the mixture ratio of benzyldimethylalkylammonium chlorides containing alkyl groups of different lengths is such that the amount of C 1-4 is 40 to 80%, preferably 55 to 65%, and 20-60% and preferably 35-45%.