RU2247652C1 - Agent for protection of wood against wood-coloring and mold funguses and insects - Google Patents

Abstract

FIELD: protection of wood, for example, protection of green lumbers, against mold and wood-coloring funguses, as well as against insects of various types.

SUBSTANCE: the agent for protection of wood contains sodium dimethyldithiocarbamate in the form of aqueous solution and additionally insecticide chlorpyrophos in the form of a hydrocarbon solution containing in mass percent: chlorpyrophos -30 to 60, aniono-active surface-active agent 1 to 10, non-ionogenic surface-active agent 1 to 10, C₇-C₁₀-aromatic solvent - the rest. At a mass ratio of the solution of sodium dimethyldithiocarbomate to the mentioned chlorpyrophos equal to 1.0:0.2 - 5.0.

EFFECT: enhanced efficiency of the agent.

2 tbl, 3 ex

Description

The invention relates to logging and woodworking industries and is intended to protect wood, for example, raw lumber, from moldy and wood-staining mushrooms, as well as from various types of insects.

Known means for protecting wood from stem and technical pests based on deltamethrin, lambda-cyglotrin, permethrin, phenvalerate, cypermethrin (State catalog of pesticides and agrochemicals approved for use in the Russian Federation, 2002). These agents, affecting the stem and technical pests of wood, do not protect it (wood) from infection with wood-coloring and mold fungi.

Known means for protecting wood from blueness and mold according to A.S. USSR No. 1659194, IPC B 27 K 3/52, B.I. No. 24, 1991, A.S. USSR No. 1698062, IPC B 27 K 3/34, B.I. No46, 1991

The disadvantage of these funds is the content in them of toxic halogen-containing organic substances. In addition, they have a pungent odor due to the presence of synthetic fatty acids or ammonia, which exacerbates operating conditions.

Known antiseptic for the protection of cellulose-containing materials (RF patent No. 2075382, IPC B 27 K 3/52, publ. 04/20/00). It contains wt.%: Trisodium phosphate (12.0-14.0), boric acid (5.0-6.0), sodium carbonate (54.0-57.0) and a compound of Quaternary ammonium-alkylbenzylammonium chloride (24, 0-26.0).

Closest to the proposed is a wood preservative (RF patent No. 2147510, IPC B 27 K 3/52, publ. March 20, 1997), which contains wt.%: Boric acid (10-25), fungicides in the form of dimethyldithiocarbamate sodium (10-30) and sulfonates (20-30), as well as carbonic salts or alkali metal bases (rest).

This tool provides good protection of lumber from mold and sapwood mushroom stain. It does not contain halogen-containing substances that are dangerous to humans and the environment.

A disadvantage of the known tool is that it does not protect the lumber from insects, i.e. possesses only fungicidal properties. Preventing infection of wood from blueness and mold, it does not affect insects.

Meanwhile, stem pests in the form of various insects (bark beetles, barbel, weevils, grinders, etc.) present a big problem in the storage of wood, which reduce its consumer properties.

The objective of the invention is to increase the effectiveness of the means to protect wood by providing additional insecticidal properties.

This object is achieved by a means for protecting wood from wood and moldy fungi and insects based on sodium dimethyldithiocarbamate, which, unlike the prototype, contains sodium dimethyldithiocarbamate in the form of an aqueous solution and, in addition, the chlorpyrifos insecticide in the form of a hydrocarbon solution containing in wt.%:

Chlorpyrifos 30-60

Anionic Surfactant 1-10

Nonionic Surfactant 1-10

C ₇ -C ₁₀ - aromatic solvent else

with a mass ratio of an aqueous solution of sodium dimethyldithiocarbamate to the specified chlorpyrifos equal to 1.0: 0.2-5.0.

Introduction to the composition of the preparation of chlorpyrifos [0,0-diethyl-0- (3,5,6-trichloro-2-pyridinyl) -phosphorothioate] in the indicated ratio of components provides reliable comprehensive protection of freshly sawn or harvested in wood stacks from both pathogens and from stem and technical pests.

The use of chlorpyrifos for the control of Colorado potato beetles, locusts in pastures and crops of crops is known (State Catalog of Pesticides and Agrochemicals Permitted for Use in the Russian Federation, 2002).

The proposed invention in the specified combination of components, mutually reinforcing fungicidal and insecticidal effects, allows you to get a cheap universal tool for protecting wood, with good performance and effective protective effect.

The product consists of two compounds - composition A, containing chlorpyrifos, and composition B, containing sodium dimethyldithiocarbamate. To improve the physicochemical properties and increase the biological effectiveness of the working solutions, composition A additionally contains an aromatic solvent C ₇ -C ₁₀ Nephras AF 9-12 (TU 38.103625-87), as well as an anionic surfactant, for example, calcium alkylbenzenesulfonate (TU 2421-011-56856807-2002) and a nonionic surfactant, for example, an auxiliary substance OP-7 or OP-10 (GOST 8433-81) in the following ratio of components:

Chlorpyrifos 30-60%

Calcium Alkylbenzenesulfonate 1-10%

OP-7 or OP-10 1-10%

Nefras AF 9-12 to 100%

The claimed composition is tested in natural conditions mixed forest. In this case, the hydrocarbon solution of chlorpyrifos (composition A) was used in three different compositions, and composition B was an aqueous solution of sodium dimethyldithiocarbamate (Table 1).

Table 1 Composition A Name of components The content of components, wt.% 1 Chlorpyrifos
OP-7
Calcium Alkylbenzenesulfonate
Nefras AF 9-12 60
one
one
38 2 Chlorpyrifos
OP-7
Calcium Alkylbenzenesulfonate
Nefras AF9-12 46
3
4,5
46.5 3 Chlorpyrifos
OP-7
Calcium Alkylbenzenesulfonate
Nefras AF9-12 thirty
10
10
fifty Composition B Sodium Dimethyldithiocarbamate
Water 40
60

A working solution for wood processing is prepared by diluting compositions A and B with water to a concentration of the active substances (chlorpyrifos and sodium dimethyldithiocarbamate) listed in table 2. The test timber was processed immediately after their felling by applying working (diluted and mixed) solutions using a small droplet sprayer providing the flow rate of the working solution of 250 ± 20 g / m ² . For each experiment, 5 pine logs were tested.

Accounting for the state of timber was carried out after a month of their exposure. To assess the degree of damage to the logs by insects and mushrooms, 3 palettes 10 cm wide were cut on the surface of each log. Table 2 shows the average indicators of wood damage after their exposure in the spring-summer period for 30 days. The numbers of the examples correspond to the numbers of the compositions of composition A.

table 2 The name of indicators Sample Numbers 1 2 3 Control (no processing) 1. Mass fraction in the working solution,%: - composition A 0.5 2,5 5,0 0 including chlorpyrifos 0.3 0.1 1,5 0 - composition B 5,0 2,5 0.5 0 including sodium dimethyldithiocarbamate 2.0 1,0 0.2 0 2. The consumption of working solution for wood processing, g / m ² 0.268 0.259 0.234 0 3. The presence of beetle settlements, pieces / log 1 0 1 22 4. The degree of damage to the fungi of blue stain and mold,% of the area 0 0 0 56

Tests have shown high efficacy of the drug. Thus, the proposed invention allows to enhance the fungicidal and insecticidal effects of wood preservatives and thus increase its effectiveness.

Claims (1)

Means for protecting wood from wood-coloring and mold fungi and insects based on sodium dimethyldithiocarbamate, characterized in that it contains sodium dimethyldithiocarbamate in the form of an aqueous solution and, in addition, the chlorpyrifos insecticide in the form of a hydrocarbon solution containing, wt.%: chlorpyrifos 30-60 anionic surfactant 1-10 nonionic surfactant 1-10 C ₇ -C ₁₀ - aromatic solvent else  with a mass ratio of an aqueous solution of sodium dimethyldithiocarbamate to the specified chlorpyrifos equal to 1.0: 0.2-5.0.