CH625993A5 - Composition for the preservation of wood and timber products - Google Patents

Abstract

In compositions for the preservation of wood and timber materials and in the preparation of these compositions composed of 1-30 % by weight of fungicide or fungicide mixture and/or 0.3-15 % by weight of insecticide or insecticide mixture and over 55 % by weight of an organic, oily or oil-type solvent or solvent mixture of low volatility which is soluble in this mixture and which can also contain one or more organic hydrophilic solvents and/or organochemical binders and/or fixatives, 0.01-0.5 % by weight of mandelic acid and/or benzotriazole are employed as corrosion inhibitors per 100 g of the wood preservative.

Description

The invention relates to an agent for the preservation of wood and wood-based materials, the composition of which has both good wood-protecting and wood-preserving properties and also reduced corrosion and / or an anticorrosive effect. The discoloration, precipitation or the associated reduction in effectiveness of the wood preservative occurring in the presence of metals, especially iron, are largely reduced or prevented. The invention further relates to a method for producing the agent for preserving wood and wood-based materials with reduced corrosion or an anticorrosive effect.

Numerous wood preservatives contain insecticides and / or chlorophenols, e.g. Penta- and / or tetrachlorophenol in addition to other active ingredients or organic solvents. However, penta- and tetrachlorophenol are highly effective fungicidal organic compounds which, when dissolved in oily wood preservatives, show a more or less strong tendency to discolour in iron containers or in iron immersion containers.

This tendency to discolour arises primarily from the corrosion effect of chlorophenols on iron. Iron dissolves as iron pentachlorophenol with a brown or dark brown color. Depending on the type of solvent, the discoloration can occur within the first few weeks when stored in iron containers. With hydrophilic solvents such as alcohols, methyl glycols or aliphatic ketones, the brown coloration takes place within a few days. In the case of agents containing pentachlorophenol, even small amounts of the dissolved pentachlorophenol in the presence of iron particles can cause severe discoloration of the solution. Numerous wood preservatives based on oils or oily solvents with certain insecticides and / or fungicides or other wood preservative substances, for example 8-oxyquinoline, carbamates, phosphoric acid esters or thiophosphoric acid esters, tetravalent organotin compounds and mixtures of two or more of these compounds show similar color changes or corrosion effects.

Corresponding wood preservatives can therefore not be used for the impregnation of fresh wood, the wood gets a frequently disturbing brown color. It is of crucial importance for the consumer of the protective agents that the light-colored wood protective agents show no discoloration after storage in iron containers or in iron immersion tanks. The impregnation agents must not change the natural wood color.

In addition, it must be prevented that metal that comes into contact with wood preservatives shows signs of corrosion and that corrosion reduces the effectiveness of the preservative.

It is already known to add inhibitors to various water-soluble wood preservatives in order to prevent corrosion. For example, according to DE-PS 1 033 401 ammonium molybdate added to the aqueous solutions of the hydrogen fluoride. Furthermore, morpholine or triethanolamine according to CA-PS 913 524 have been used as inhibitors for aqueous solutions of ammonium or alkali salts of tetra- and pentachlorophenol. In general, however, these inhibitors for water-soluble wood preservatives cannot be used in the same way for wood preservatives based on oils or oil-like agents. For example, the aforementioned corrosion inhibitors cannot be used for oily wood preservatives. They are poorly soluble in it, lead to precipitation or have no corrosion-inhibiting effect in this composition.

It is also known that dibenzyl sulfoxide as an inhibitor for salt-like wood preservatives - e.g. for aqueous silicone fluoride solutions or for aqueous bifluoride solutions - used with great success. In oil-like pentachlorophenol-containing wood preservatives, however, dibenzyl sulfoxide leads to increased iron attack. It can be seen from this that inhibitors which greatly reduce corrosion in salt-like preparations do not have an inhibitory effect in oil-like and chlorophenol-like agents or increase the metal attack.

The aim and object of the present invention was therefore to avoid the aforementioned disadvantages and to find a wood preservative of high effectiveness. A further aim was to find a wood preservative with the use of oil-soluble or oil-soluble organic-chemical insecticides or fungicides in which the discoloration of the preservatives can be prevented or reduced or in which the signs of corrosion when exposed to metal , in particular iron, which comes into contact with the wood preservatives or with the wood treated with them, can be prevented or reduced. Since the wood preservatives also often have additional resins with a higher acid number and / or additives such as tall oil esters and the like. contain, which also promote corrosion, the corrosion should also be prevented or reduced when using these additives, synthetic resins or fixing agents in the wood preservative. Finally, a process for making this wood preservative should be found.

According to the invention, it was found that these tasks are performed by a means for preserving wood and wood-based materials, which consists of 1-30% by weight, preferably 3-8% by weight, of a solvent in an organic, non-volatile, oily or oily solvent Evaporation number above 35 and a flash point above 30 ° C. of a fungicide or fungicide mixture soluble and / or 0.3-15% by weight, preferably 1-5% by weight, of an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C

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625 993

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soluble insecticide or mixture of insecticides, and more than 55% by weight, preferably more than 87% by weight, of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. and 100 g each of the wood preservative contains 0.01-0.5% by weight, preferably 0.05-0.1% by weight, of mandelic acid and / or benzotriazole as a corrosion inhibitor. Mandelic acid and benzotriazole thus prove to be good corrosion inhibitors in the oily or oily wood preservatives which contain insecticides and / or fungicides. The mandelic acid used in the wood preservative obviously forms a thin, corrosion-protecting layer on the metal surfaces. Similarly, the benzotriazole also acts as a corrosion inhibitor in the preservative.

According to a particularly advantageous embodiment, 0.5-10% by weight, preferably 2-5% by weight, of the organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. the same amount of one or more organic hydrophilic solvents are replaced, the hydrophilic solvents used being those which are readily dispersible or emulsifiable, preferably soluble, in the oily or oily solvent. Those solvents are used as hydrophilic solvents which have a flash point above 30 ° C. and an evaporation number above 35; Corresponding aliphatic and / or aromatic alcohols, ke-tones or alkyl glycol ethers are preferably used.

According to a further advantageous embodiment, 0.5-20% by weight, preferably 2-15% by weight, of the organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. the same amount of one or more organic chemical binders and / or fixatives is replaced, the organic chemical binders and / or fixatives used being those which are readily dispersible or emulsifiable, but preferably soluble, in the oily or oily solvent. Alkyd resins, linseed oil, varnish or phenolic resins are preferably used as organic chemical binders. The fixing agents which are intended to prevent or reduce the volatilization of the active substances in the wood include resins and resinous products, high-boiling solvents with a very low vapor pressure, plasticizers and the like; phosphoric acid esters, phthalic acid esters, glycerol esters and glycerol ethers or higher molecular weight glycol ethers are preferably used for these purposes.

Water-insoluble or hardly water-soluble solvents are preferably used as organic, low-volatility, oily or oily solvents with an evaporation number above 35 and a flash point above 30 ° C. Corresponding mineral oils or their aromatic fractions or mineral oil-containing solvent mixtures, preferably white spirit, petroleum, gas oil and / or alkylbenzene, are advantageously used as such solvents.

According to a particularly advantageous embodiment, a chlorinated phenol, preferably penta- and / or tetrachlorophenol, is used as the fungicide or as part of the fungicide mixture.

The known insecticides which are soluble in the oily or oily solvents are used as insecticides. According to a particularly advantageous embodiment, a phosphonic acid ester and / or thiophosphoric acid ester and / or phosphoric acid ester and / or thionophosphoric acid ester and / or thiol phosphoric acid ester and / or a car-bamate is used as the insecticide or as a component of the insecticide mixture.

The use of the chlorinated phenols in combination with carbamates and / or phosphoric acid esters or thiophosphoric acid esters together with mandelic acid and / or benzotriazole is particularly advantageous with regard to the action of the preservative and the reduction of corrosion. In this combination, considerable discoloration of the wood preservatives in the metal containers or when the wood preservatives act on metal or metal parts containing wood were observed when the wood preservative was used without the addition of mandelic acid and / or benzotriazole. Furthermore, corrosion of the iron parts that came into contact with the wood preservative occurred. These phenomena can be avoided when using mandelic acid and / or benzotriazole.

Benzotriazole has a particularly favorable effect as an inhibitor in these combinations of active substances with the use of chlorinated phenols, in particular pentachlorophenol and / or tetrachlorophenol or in the case of combinations of active substances in chlorinated phenols, preferably penta- or tetrachlorophenol together with insecticides based on carbamates and / / which are soluble in oily or oily solvents. or phosphoric acid esters or thiophosphoric acid esters. With these combinations of active ingredients, benzotriazole has a somewhat better inhibiting effect than mandelic acid. The addition of benzotriazole in these compositions also prevents attack on metal, in particular iron, and at the same time protects the wood preservative against the dark discoloration that occurs when it is corroded with iron particles or in iron containers.

In contrast, the use of mandelic acid is somewhat more advantageous for some other organic chemical insecticides or fungicides and / or organic chemical wood preservatives which are soluble in oily or oily solvents.

It is particularly expedient to use a combination of benzotriazole and mandelic acid in a ratio of approximately 20: 1 to approximately 1: 4 in the context of the preservative according to the invention for wood and wood-based materials.

It is advisable not to let the preservative discolour or the corresponding corrosion to occur, but to use the agent in the specified composition from the start with the inhibiting agents, since subsequent decolorization or dissolution after corrosion has occurred, depending on the type of used fungicides, the duration of exposure and the like. is no longer possible in numerous cases.

According to one embodiment, the chlorinated phenol, preferably penta- and / or tetrachlorophenol, is wholly or partly replaced by another fungicide, preferably by 8-oxyquinoline or by phenylmercury-8-oxyquinolinate and / or by a fungicidal salt of N-nitroso -N-cyclohexylhydroxylamine, preferably Al-N-nitroso-N-cy-clohexylhydroxylamine. The chlorinated phenol, preferably penta- and / or tetrachlorophenol, is expediently up to 50% by weight, preferably up to 30% by weight, by 8-oxyquinoline or by phenylmercury-8-oxyquinolinate and / or by a fungicidal salt of N-nitroso-N-cyclohe-xylhydroxylamine, preferably Al-N-nitroso-N-cyclohexyl-hydroxylamine, replaced.

The invention further relates to a method for producing the agent for preserving wood and wood-based materials, according to which mandelic acid and / or benzotriazole in amounts by weight of 0.01-0.5% by weight during or after the production of the wood preservative as an additive and corrosion inhibitor. %, preferably 0.05-0.1% by weight, based on 100 g of the finished wood preservative, which consists of 1-30% by weight, preferably 3-8% by weight, of one in an organi5

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625 993

see, volatile, oily or oily solvent with an evaporation number above 33 and a flash point above 30 ° C soluble fungicide or fungicide mixture and / or 0.3-15 wt .-%, preferably 1-5 wt .-%, one in an organic , non-volatile, oily or oily solvents with an evaporation number above 35 and a flash point above 30 ° C soluble insecticide or insecticide mixture and more than 55% by weight, preferably more than 87% by weight, of an organic, non-volatile, oily or oily Solvent with an evaporation number above 10 35 and a flash point above 30 ° C is added or mixed. The mandelic acid and / or the benzotriazole in the form of a paste, dispersion or solution are expediently added to the wood preservative during or after the preparation, with the use of an organic solvent.

According to a particularly advantageous embodiment, the mandelic acid and / or the benzotriazole are added in the form of a 0.5-10% solution, preferably in the form of a 2-6% solution, dissolved in one or more solvents.

The preservatives are often produced in the form of concentrates which, after being transported to the place of use, are diluted back to the normal concentration using organic, low-volatility, oily or oily solvents. This makes it possible to produce highly effective wood preservation concentrates that can be transported in a cost-saving manner. In the manufacture of these concentrates according to the invention, the concentrate of the preservative for wood and wood-based materials consists of 10-30% by weight of a solvent which is soluble in an organic, non-volatile, oily 30 or oil-like solvent with an evaporation number above 35 and a flash point above 30 ° C Fungicide or fungicide mixture and / or an insecticide or insecticide mixture which is soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point 35 above 30 ° C. and more than 55% by weight of an organic, low-volatility, oily or oily Solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. It is advisable to add mandelic acid and / or benzotriazole as corrosion inhibitors to the concentrate, particularly if the concentrate is to be stored or transported in contact with metal, for example in sheet iron containers. Binders and / or fixatives can already be added to the concentrate, 5-20% by weight of the organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. by the same Amount of a binder and / or fixative can be replaced 50 which is finely dispersible or emulsifiable in the solvent, but is preferably soluble. In special cases, the organic, low-volatility, oily or oily solvent from 1 to 30% by weight can also be replaced by the preferably soluble binder and / or fixing agent. Mandelic acid and / or benzotriazole should be added to the concentrates in amounts of 0.01 to 0.5% by weight, depending on the dilution ratio to be used.

Examples Example 1

Penta- and / or tetrachlorophenol (as

% By weight

Fungicide)

7

Hexachlorocyclohexane (as an insecticide)

1

Almond acid

0.05

Alkyd resin, 100%

4th

White spirit

79.95

When this wood preservation agent is stored for 4 weeks at 50 ° C, the solution does not change in the presence of iron nails. The same agent, but without almond acid, changed color slightly after one week and turned brown after 4 weeks.

Example 2

% By weight

Penta- and / or tetrachlorophenol (as

Fungicide) 6

Active ingredient based on carbamates

(as an insecticide) 2

Active ingredient based on thiophosphoric acid esters

(as an insecticide) 1

Linseed oil 7

Benzotriazole 0.05

Aromatic hydrocarbons and

White spirit 83.95

This means of preserving wood shows no discoloration with benzotriazole in the presence of iron nails at 40 ° C for 4 weeks. Without benzotriazole, severe discoloration of the product can be seen after just one week.

Example 3

% By weight

Penta- and / or tetrachlorophenol (as

Fungicide)

6

Active ingredient based on carbamates

(as an insecticide)

2nd

Active ingredient based on thiophosphoric acid esters

(as an insecticide)

2nd

Alkyd resin, 100%

15

Desiccant (as a hardening agent or drying agent

for the alkyd resin)

0.2

Aromatic solvents and white spirit

74.74

Benzotriazole

0.03

Almond acid

0.03

This agent for preserving wood showed no discoloration with the additive mixture (benzotriazole and mandelic acid) in the presence of iron nails at 45 ° C for 5 weeks. If the preservative is used without the additive mixture, severe discolouration of the agent can be seen after just one week.

According to a preferred embodiment, mixtures are preferably used as penta- or tetrachlorophenol, namely pentachlorophenol with 15-35% by weight tetrachlorophenol or tetrachlorophenol with 20-45% by weight pentachlorophenol.

Experiments and comparative experiments Using the wood preservative according to the invention, experiments were carried out with and without the addition of mandelic acid and / or benzotriazole in the presence of metals to determine the corrosion or discoloration that occurred. The metals were immersed in the appropriate wood preservative throughout the test. The test mixtures used have the following particular compositions:

1. 94.5% by weight of an aromatic solvent mixture based on mineral oil,

5.5% by weight pentachlorophenol / tetrachlorophenol 1: 1.

2. 92.0% by weight of an aromatic solvent mixture based on mineral oil,

5.5% by weight of pentachlorophenol / tetrachlorophenol 1: 1, 1.5% by weight of a phosphoric acid ester,

1.0% by weight of a carbamate.

625 993

3. 90.0% by weight of an aromatic solvent mixture based on mineral oil,

5.5% by weight of pentachlorophenol / tetrachlorophenol 1: 1, 2.0% by weight of a carbamate,

1.5% by weight of a phosphoric acid ester,

1.0% by weight of a carbamate.

4. 96.0% by weight of an aromatic solvent mixture based on mineral oil,

4.0% by weight Al-N-nitroso-N-cyclohexylhydroxylamine.

5. 93.5% by weight of an aromatic solvent mixture based on mineral oil,

5.5% by weight pentachlorophenol / tetrachlorophenol 1: 1, 1.0% by weight lindane (hexachlorocyclohexane).

6. 88.5% by weight of an aromatic solvent mixture based on mineral oil,

4.0% by weight Al-N-nitroso-N-cyclohexylhydroxylamine, 5.5% by weight pentachlorophenol / tetrachlorophenol 1: 1, 2.0% by weight tributyltin oxide.

7. 95.0% by weight of an aromatic solvent mixture based on mineral oil,

5.0% by weight 8-oxyquinoline.

8. 90.5% by weight of an aromatic solvent mixture based on mineral oil,

4.0% by weight Al-N-nitroso-N-cyclohexylhydroxylamine, 5.5% by weight pentachlorophenol / tetrachlorophenol 1: 1.

Test results in the presence of benzotriazole (corrosion values in g / m2)

Test mixture without benzotriazole

with 0.1% benzotriazole

Discoloration of the test mixtures

through Fe

Fe

Cu

Al

Fe

Cu

Al without

Corrosion inhibitor with 0.1% corrosion inhibitor

1

7.3

4.6

0

0.7

0

0

brown none

Discoloration *

2nd

16.6

5.1

2.5

2.1

3.6

0

brown none

Discoloration *

3rd

44.9

35.8

4.7

1.0

6.3

0

dark brown yellowish

4th

0.7

4.1

3.4

0

0

0.2

light brown none

Discoloration *

5

0.5

4.7

0

0

0

0

light brown none

Discoloration *

* No discoloration means that there is practically no color change compared to the wood preservative that has not come into contact with iron.

Test results in the presence of mandelic acid (corrosion values in g / m2)

Test mixture without mandelic acid Fe AI

with 0.1% mandelic acid Fe AI

Discoloration of the test mixtures by Fe without 0.1%

Corrosion Corrosion Inhibitor Inhibitor

3rd

4th

16.6

44.9 2.4

6.7

2.5

4.7 1.2

0

0.6

0.6 0

2.1

brown dark brown light brown brown none

Discoloration *

yellowish none

Discoloration * none

Discoloration *

* No discoloration means that there is practically no color change compared to the wood preservative that has not come into contact with iron.

S

Claims (10)

625 993 1. Means for preserving wood and wood-based materials on the basis of organic chemical fungicides and / or organic chemical insecticides dissolved in oily or oily solvents and an organic, oily or oily solvent or oily or oily solvent mixture as the main component, characterized in that the Preservative from a) 1-30% by weight of a fungicide or mixture of fungicides or a mixture of solvents which is soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C. and / or 0.3-15% by weight an insecticide or mixture of insecticides that is soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C. Evaporation rate over 35 and a flame m point above 30 ° C or b2) more than 45% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C and 0.5-10% by weight of one or a plurality of organically hydrophilic solvents which are readily dispersible or soluble in the oily or oily solvent or solvent mixture or b3) more than 35% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C and 0.5-20 wt .-% of one or more organic chemical binders and / or fixatives, which are easily dispersible or soluble in the oily or oily solvent or solvent mixture, and each 100 g of the wood preservative c) Contains 0.01-0.5% by weight of mandelic acid and / or benzotriazole as a corrosion inhibitor. 2. Means for preserving wood and wood-based materials according to claim 1, characterized in that the preservative from a) 3-8% by weight of an in an organic, non-volatile, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C soluble fungicide or fungicide mixture and / or 1-5% by weight of an insecticide or insecticide mixture which is soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C and bj) more than 87% by weight .-% of an organic, semi-volatile, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C or b2) more than 82% by weight of an organic, semi-volatile, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C and 2-5 wt .-% of one or more he organic hydrophilic solvents which are easily dispersible or soluble in the oily or oily solvent or solvent mixture or b3) more than 72% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. and 2-15% by weight of one or more organic chemical binders and / or fixatives, which are easily dispersible or soluble in the oily or oily solvent or solvent mixture, and each 100 g of the wood preservative c) 0, Contains 01-0.5% by weight of mandelic acid and / or benzotriazole as a corrosion inhibitor. 2nd PATENT CLAIMS 3rd 625 993 th) more than 87% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C or b2) more than 82% by weight of an organic, low-volatility, oily or oil-like Solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C and 2-5 wt .-% of one or more organic-hydrophilic solvents which are easily dispersible or soluble in the oily or oily solvent or solvent mixture or b3) more as 72% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C. and 2-15% by weight of one or more organic chemical binders and / or fixing agents, the are easily dispersible or soluble in the oily or oily solvent or solvent mixture, per 100 g of the wood preservative c) 0.01-0.5% by weight of mandelic acid and / or benzotriazole can be added as a corrosion inhibitor. 3. Means for preserving wood and wood-based materials 5 according to claims 1 and 2, characterized in that the Fungicide or a component of the fungicide mixture is a chlorinated phenol, preferably penta- and / or tetrachlorophenol. 4. Means for preserving wood and wood materials io according to claims 1 and 2, characterized in that the Insecticide or a component of the insecticide mixture is a phosphoric acid ester or thiophosphoric acid ester and / or a carbamate. 5. means for preserving wood and wood-based materials 15 according to claims 1 to 4, characterized in that an organic fungicidal and / or insecticidal, tetravalent tin compound is present as an insecticide or fungicide. 6. Means for preserving wood and wood-based materials according to claims 1 to 3, characterized in that the 20 chlorinated phenol, preferably penta- and / or tetrachlorophenol, in addition another fungicide, preferably 8-oxyquinoline or phenylmercury-8-oxyquinolinate and / or by a fungicidal salt of N-nitroso-N-cyclohexylhydroxylamine, preferably Al -N-Nitroso-N-cyclohexylhydroxylamine, 25 contains. 7. A process for the preparation of the agent for preserving wood and wood-based materials according to claim 1, characterized in that the preservative consisting of a) 1-30 wt .-% of an in an organic, difficultly volatile, oily or oily solvent with a Evaporation number above 35 and a flash point above 30 ° C, soluble fungicide or fungicide mixture and / or 0.3-15% by weight of an in an organic, low volatility, oily or oily solvent with an evaporation number above 35 35 and a flash point above 30 ° C soluble insecticide or insecticide mixture and bx) more than 55% by weight of an organic, low-volatility, oily or oily solvent or solvent mixture with an evaporation number above 35 and a 40 flash point above 30 ° C or b2) more than 45% by weight of one organic, semi-volatile, oily or oily solvent or solvent mixture with an evaporation number over 35 and a fla mm point above 30 ° C. and 0.5-10% by weight of one or 45 more hydrophilic solvents which are readily dispersible or soluble in the oily or oily solvent or solvent mixture, or b3) more than 35% by weight of an organic, semi-volatile, oily or oily solvent or solvent mixture with an evaporation number above 35 and a flash point above 30 ° C and 0.5-20 wt .-% of one or more organic chemical binders and / or fixatives contained in the oily or oily solvents or solvent mixtures are easily dispersible or soluble, 55 per 100 gc) 0.01-0.5% by weight of mandelic acid and / or benzotriazole are added as a corrosion inhibitor. 8. The method according to claim 7 for the preparation of the agent according to claim 2, characterized in that the consumer 60 cross-linking agents consisting of a) 3-8% by weight of a fungicide or fungicide mixture and / or 1-5 65% by weight soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C. % of an insecticide or insecticide mixture which is soluble in an organic, low-volatility, oily or oily solvent with an evaporation number above 35 and a flash point above 30 ° C. and 9. The method according to claims 7 and 8, characterized in that the mandelic acid and / or the benzotriazole is added in the form of a paste, dispersion or solution using an organic solvent to dissolve the mandelic acid and / or benzotriazole. 10. The method according to claims 7 to 9, characterized in that the mandelic acid and / or the benzotriazole is added in the form of a 0.5-10% solution.