DD275433A1 - NEW WOOD PROTECTION - Google Patents

Abstract

The invention relates to novel wood preservative active ingredients for oelige wood preservative formulations for the comprehensive protection of wood against holzverfaerbende and holzzerstoerende mushrooms. As active ingredients, the novel agents contain substituted Cyanimidodithiocarbonate alone or in combination with other known wood preservative active ingredients. In addition to formulation auxiliaries, they additionally contain higher-boiling hydrocarbons and / or binders such as linseed, alkyd resins, vinyl resins, chlorinated vinyl resins, chlorinated vinyl resins, soluble polymers and / or resins, bitumen, paraffin, silicone oils and / or chlorinated paraffins. oily, wood-spoiling and wood-destroying fungi; agents; Cyanimidodithiocarbonate; Combination; hydrocarbons; Binder; Linseed oil; alkyd resins; Vinyl resins; polymers; resins; Bitumen; Paraffin; Silicone oils}

Description

Field of application of the invention

The invention relates to novel wood preservative active ingredients for oily wood preservative formulations for comprehensive protection of wood against wood-discoloring and wood-destroying fungi.

Characteristic of the known technical solutions

For the protection of wood against fungi a variety of active ingredients are known. In practical wood preservation, however, only a very limited number of substances are used, since the complicated synthesis of new active substances often requires an unacceptably high economic outlay and a special raw material base.

Above all, tributyltin oxide, pentachlorophenol, dichlofluanid and methylenebisrhodr.diide are used.

Tributyltin oxide is a long-standing proven wood preservative active ingredient, which skh but degrades very quickly under UV irradiation and thus can not ensure effective protection against wood-staining fungi.

Although pentachlorophenol has a comprehensive and long-lasting effect against wood-discoloring as well as against wood-destroying fungi, but is because of its persistence and the by-product a! S environmental toxin under criticism. In practice, the agent must be used in relatively high concentrations (4 to 8% solutions) to counter degradation by UV radiation.

Dichlofluanid is effective against wood-discoloring fungi, but its low activity against wood-destroying fungi requires fairly high levels of application. In addition, this drug is not stable to UV radiation.

Methylenbisrhodaniri is well-acting against wood-discolouring fungi but not generally applicable for toxicological reasons. Also combinations o.g. Active ingredients have not solved these problems. The durability of the wood is impaired by the rapid degradation of the active ingredients on the wood surface, resulting in an infestation with wood-discoloring and wood-destroying fungi.

In DD-PS 154957 and 155001 new wood preservatives or wood coatings are described, which are characterized by a wide range of uses, extended duration of action and good fungicidal activity. They contain active ingredient combinations of tributyltin compounds, tributyltin dialkyldithiocarbamates and tetraalkylthiuram disulfide.

A disadvantage of this wood preservative combination exist in the relatively high application rate and the associated toxicity problems.

Aim of the invention

The aim of the invention is to find new less toxic UV-stable Holzschuizmittel agents with a comprehensive action against wood-discoloring and wood-destroying fungi, which can be used alone or in combination with other active ingredients.

Explanation of the essence of the invention

The object of the invention is to find new, easily accessible and easy to produce active ingredients that are suitable for effective wood protection.

This object is achieved in that the novel wood preservatives in addition to conventional excipients and carriers as active compounds of the general formula

XGH ₂ S

= N-CoN, RS '

in the

R is a lower alkyl or alkylene radical or an aralkyl radical and X is halogen.

The new active compounds can be prepared by literature methods (DD-PS 256693) by alkylation of potassium monoester salts of Cyanimidodithiokohlensäure with chlorobromoethane and optionally subsequent Umhalogenierung.

Surprisingly, they are outstandingly effective against wood-discolouring and wood-destroying fungi. The effect of the invention against wood-destroying fungi already occurs at concentrations of <0.34 kg / m ³ . The active ingredients are less toxic and readily soluble in commercial organic solvents. They penetrate very well into the wood and thus guarantee a deep protection of the treated material. This is particularly significant because such agents that adhere only to the surface can not protect the wood from cracking on fungicidal attack. The wood preservatives according to the invention can in addition to conventional organic solvents and hydrophobizing additives in amounts of 1-10% by weight in the form of solid paraffins, chlorinated paraffins or silicone oils and / or 0.5 to 20 mass fraction in% binder such as linseed oil, Leinölfirniß , Alkyd resins, vinyl resins, chlorinated vinyl resins or / and in the respective solvent mixture-soluble polymeric substances such as resins, bitumen or tar oils. For practical purposes, taking into account the requirements in terms of long-term effects and safety wood preservatives according to the invention contain at least one or two of the active compounds according to the invention in concentrations of 0.1-10%, preferably 0.2-3%. The wood preservatives according to the invention may additionally contain known wood preservatives such as tributyltin oxide, tributyltin benzoate, pentachlorophenol, dichlofluanid, methylenebisrhodanide and / or others.

embodiments

In the following, the invention will be explained by way of example without limiting it.

The results are presented in the form of tables indicating the particular agents used and the concentrations used, as well as the rating. In addition, some Holzschutzmittolrezeoturen were used in these tests, which are then called with their short names. The testing is successful *. in the concentration stated in the test description.

Recipe 1

Chloromethyl ethyl cyanimidodithiocarbonate 2%

Chlorobenzene 10%

p-chlorobenzene 20%

o-dichlorobenzene 20%

Gasoline 140/180 48%

Recipe 2 chloroformate-n-propyl cyanimidodithiocarbonate 1.8%

Chlorobenzene 5%

p-dichlorobenzene 10%

o-dichlorobenzene 30%

Gasoline 140/180 45.2%

Heavy oil 8%

Recipe 3 chloromethyl-isopropyl-cyanimidodithiocarbonate 2%

petrol 40% paraffin 5% montan resin 5% xylene 48% Recipe 4 Chloromethyl-methyl-cyanimidodithiocarbonat toluene 10% petrol 76% linseed oil 10% alkyd resin 3% desiccant 0.5% Recipe 5 , Allyl chloromethyl-cyanimidodithiocarbonat vinyl resin 5% silicone oil 1% petrol 23.2% xylene 70%

0.5%

0.8%

Recipe 6

Benzyl chloromethyl cyanimidodithiocarbonate 1%

Polystyrene 2%

Xylene 50%

Paraffin 2%

Silicone Clot 1%

Chlorobenzene 10%

o-dichlorobenzene 11%

p-dichlorobenzene 23%

Recipe 7 chloromethyl-methyl-cyanimidodithiocarbonate 0.5%

tributyltin Pentachlorophenol 0.8% chlorobenzene chlorobenzene 15% p-dichlorobenzene p-dichlorobenzene 20% o-dichlorobenzene o-dichlorobenzene 25% chlorinated polyethylene chlorinated polyethylene 3% Bonzin 140/180 Gasoline 140/180 30.7% xylene XvIoI 5% Recipe 8 4.3% 15% 20% 22% 3% 30.7% 5%

example 1

Testing against wood-discolouring fungi Experiment description

Groundwood cardboard measuring 4.5 x 13.4 cm is impregnated with 2.12 g sample solution in the specified concentration and dried. The boards are then exposed to UV radiation in the xenon tester. The load takes place in several stages. After this treatment, the cardboard must be moistened before the biological test. Inoculation takes place with a spore suspension of the test fungus Pullularia pullulans. The inoculated cardboard is placed in a moist chamber for incubation and stored at a temperature of 20 to 26 ⁰ C in the incubator. The evaluation takes place after 10 days.

Bonlturschema:

1 = heavy infestation

2 = average infestation

3 = low infestation

4 = no infestation

Table 1 summarizes the results obtained:

Table 1 Inhibition of wood-discoloring fungi by the agents according to the invention

Claims (4)

1. New wood preservatives with a broad spectrum of activity, preferably against wood-destroying and in particular holzverfärbende mushrooms, characterized in that they are in addition to conventional formulation auxiliaries as cyanimidodithiocarbonates of the general formula XCH ₀ S ^ά "C = N - G s N,
RS ^ in which R is a lower alkyl, alkenyl or aralkyl radical and X is halogen. 2. New wood preservatives according to claim 1, characterized in that they contain the active ingredients in concentrations of 0.01-10 parts by weight in%. 3. New wood preservative according to claim 1, characterized in that they contain the active ingredients alone or in combination with other known wood preservative active ingredients. 4. novel wood preservative according to claim 1, characterized in that they in addition to conventional organic solvents hydrophobizing additives in amounts of 1-10 parts by weight in% in the form of solid paraffins, chlorinated paraffins or silicone oil and / or 0.5-20 parts by weight in% binder such as linseed oil, Leinölfimiß, alkyd resins, vinyl resins, chlorinated vinyl resins and / or soluble polymeric substances such as resins, bitumen or tar oils.