NZ226721A - Wood preservative composition - Google Patents

Abstract

A wood protecting agent contains (a) a dimethylalkyl amine; (b) a water soluble acid; (c) a water insoluble acid or 2-(methoxycarbonyl)-benzimidazole.

Description

New Zealand Paient Spedficaiion for Paient Number £26721 r r.j Cw. r» ■ r\ - • 22 67 2 1 '$g j ; ■"• y \ Patents Form No. 5 NEW ZEALAND PATENTS ACT 19 5 3 COMPLETE SPECIFICATION WOOD PRESERVATIVES if/w'e, DR. WOLMAN GMBH, a German Limited Liability Company organised and existing under the laws of the Federal Republic of Germany, of 7573 Sinzheim, FEDERAL REPUBLIC OF GERMANY hereby declare the invention, for which }f/ve pray that a patent may be granted to ni£/us, and the method by which it is to be performed, to be particularly described in and by the following statement: (followed by page la) ■A, 1 26oc^; 22 67 2 - O.Z. Q97S/Q0064 Wood preservatives The present invention relates to water-soluble wood preservatives for preserving, in particular, fresh wood, for example fresnly cut wood in sawmills or freshly 5 felled timber in the forest.

It is known that dimethylalkylamines, 2-Cmethoxy-carbonylamino)~benzimidazole C8CM) or N-tridecyl-2,6-di-methylmorpholine (tridemorph), for example in the form of their salts, can be used for preserving wood ( E P - 14 7 976, 10 DE-3 138 575.3 and DE-3 507 420.5). However, their actions are unsat isfactory.

We have found that wood preservatives which contain a) a dimethylalkylamine, b) a water-soluble acid and c) a water-insoluble acid or BCM or c) a water-insoluble 15 acid and 2-(methoxycarbonylamino)-benzimidarole have a very good action against wood pests, in particular fungi, the action being better than that of the known wood preservatives. The novel wood preservatives are water-soluble. They are used in the form of aqueous impregnat-20 ing solutions, which are prepared from the wood preservatives (concentrates) by dilution with water. The present invention relates both to the concentrates and to the dilute aqueous solutions (impregnating solutions) obtainable by diluting the concentrates with water. The 25 novel wood preservatives are suitable for protecting wood, in particular fresh wood, as obtained, for example, as freshly cut wood in sawmills or as freshly felled timber in the forest.

A dimethylalkylamine is an N,N-dimethyl-N-alkyl-30 amine where alkyl is, for example, of 6 to 20, preferably 12 to 14, carbon atoms. In addition to the pure di-methyla IkyI amines, it is also possible to use mixtures, for example mixtures of d i me t h y I-C i2~a ^ Y a m * ne anc^ methyl-C-14-alkylamine (dimethyl-C-ij/C-i^-alkylamine). 35 A water-soluble acid is, for example, a water- soluble inorganic acid, for example an acid of phosphorus, in particular phosphonic acid (H3PO3), phosphinic 22 6721 - 2 - O.Z. 0975/C006^ acid (HjPOj), acidic anosohor ic esters (eg. mono- or di-alkyl phosphate, for example monobutyl phosphate or di-butyl phosphate) or monoalkyl ptiosodonates, or an acid of sulfur, eg. a sulfonic acid, for example benzenemono-sulfonic or benrenedisulfonic acid, sulfamic acid or £ -phenolsulfonic acid, or an organic C2-C4-carboxyIic acid, for example a monocarboxylic acid, eg. acetic acid, propionic acid, methoxyacetic acid, lactic acid or glycollic acid, or poIycaroox/Iic acids, eg. fumaric acid, citric acid or maleic acid.

A water-insoluble acid is, for example, an aliphatic C5-C20~carboxy1ic acid, for example a monocarbox-ylic acid, such as hexanoic acid, heptano ic acid, octanoic acid, nonanoic acid, decanoic acid, 2-ethyIpentanoic acid, 2-ethylhexanoic acid, 2-ethylheptanoic acid, isooctanoic acid, isononanoic acid or versatic acids (highly branched .nonocarboxyl ic acids), or a dicarboxylic acid, eg. decane-dicarboxylic acid.

The acids can also be used in the form of their salts, eg. dimethylalkylamine salts. The BCM-containing agents may also contain a water-insoluble acid, in addition to the water-soluble acid.

The wood preservatives are water-miscible, form clear solutions with water and, in the usual concentration for use (from 0.5 to *0.0% by weight, based on the concentrate), have a pH of less than 7.0 when a dimethylalkylamine is used exclusively, a pH of less than 6 when mixtures of a dimethylalkylamine with tridemorph are used and a pH of less than 3.5 when mixtures of dimethylalkylamine with BCM are used. They are prepared by mixing the individual components with one another.

The wood preservatives (concentrates) are more or less viscous solutions whose viscosity can be reduced by adding polar solvents. Examples of suitable polar solvents are dimethyIf0rmamide, diethyIf0rmamide, N-methyl-pyrrolidone, dimethyl sulfoxide, glycols, polyglycols, glycol ethers, glycol ether acetates and alcohols. In It 6 7 - 3 - 0.2. G9?5/C3C6£ these cases, the BCM salt is generally in pasty form.

The concentrates generally contain from 5.0 to 75.0, in particular from 30 to 50, X by weight of a dimethyI-C5-Cjq-a IkyLamine, from 0 to 75.0, in particular from 15 to 25, X by weight of tridemorph, from 0 to 25.0, in particular from 4 to 12, X by weight of SCM, from 2.5 to 50.0, in particular from 10 to £5, X by weight of a water-soluble acid, from 0 to 25.0, in particular from 5 to 15, X by weight of a water-ins01ubIe acid and from 0 to 50.0, in particular from 4 to 30, X by weight of a solvent, the sum being 1002 by weight in each case. The mixing ratio (parts by weight) of BCM to dimethylalkylamine is, for example, from 1 : 50 to 2 : 1, preferably from 1 : 20 to 1 : 2.

Water, which, for example, is present in the commercial form of the acids, may also be present.

The following may additionally be used: wetting agents, corrosion inhibitors, colorants and, if required, binders.

In order to improve the range of action of the wood preservatives, they may additionally contain nitrogen-containing organic fungicides, for example further morpholine derivatives, eg. fenpropemorph or aldi-morph, guanidine derivatives, eg. dodecylguanidine, chlorhexadine or guazatine, imidazole derivatives, eg. imazalil, dodecylimidazole or glyodine, pyrimidine derivatives, eg. hexatidine, or quaternary ammonium compounds, eg. N-dodecylpyridinium chloride. Other fungicides may also be used, for example 2-(thiocyanomethy I -thio)-benzothiazo1e, 3-iodo-2-propyny I buty1 carbamate, 2-(4-thiazolyl)-benzimidazole or water-soluble salts (eg. the potassium salt) of N-cycI ohexyIdiazenium dioxide.

Other fungicides too, such as furmecyclox or 22 6 7 2 1 - £ - O.Z. C975 /CQG64. benodanil, or insecticides, such as lindane or oerae tn-r in, can be added to the formulations and should be incorporated with or without the addition of emulsifiers, for example ox/ethylated nonylphenols. 5 Depending on the danger to which the wood is ex posed, application for preservation of the wood may be effected, for example, a) by spraying the wood with the solution, b> by dipping the wood into the solution, 10 c) by impregnating the wood by means of pressure differences, for example by the pressure process or double vacuum impregnat ion, or d) by spreading the preservative over the wood.

In the case of secondary wood products, for exam-*5 pie cut wood and pulp, and other industrial products or ce 11 uIose-containing materials which are susceptible to fungal attack, for example intermediates in papermak ing, ligneous annual plants (bagasse, rape), the application should be adapted to the technical possibilities. 20 The wood-preserving activity of the agents covers, for example, a) molds (eg. Aspergillus niger), b) fungi which cause wood rot (eg. Chaetomium globosum), c) blue stain fungi (eg. Pullularia pullulans) and 25 d) wood-destroying 8asidiomycetes (eg. Serpula lacrymans); in particular, the action against blue stain fungi is very good.

The wood preservatives have a very good fungici-30 dal action, as shown by the experiments below.

The experiments were carried out using fresh, sawn pine sapwood timbers measuring 200 x 50 x 15 mm, which had been deep-frozen at the beginning of the experimen t.

After thawing out (which takes about 6 hours), the timbers were dipped for about 10 seconds in the solutions to be applied, placed in an inclined position r* 22 6 7 2 1 - 5 - O.Z. 0975/00064 to drip off, stored under a roof for about 24 hours under normal atmospheric conditions and then olaced in the test area. Ten sample boards were impregnated with each individual test solution in the manner described above. Unimpregna-5 ted control timbers were dipped into pure water.

The test area chosen was a snady meadow, whose grass was cut short before the'test timbers were laid out. The test timbers were placed on two plastic rails, at a height of about 1 cm above the grass. TO The test boards exposed to outdoor weather (rain) were checked after two months (August/September).

The fungicidal activity was classified in four categories on the basis of the resulting discoloration and changes in the wood surface: 0 No overgrowth +■ Slight spot-like superficial overgrowth + +• More extensive spot-like overgrowth Large areas of overgrowth or completely overgrown. COMPARATIVE EXAMPLE 2 0 50.002 of dimethyl-Cij/C-j^-alkylamine 17.502 of phosphonic acid 22.502 of propylene glycol Concentration used Appearance of the 10 test timbers 2.52 5.0% + + + COMPARATIVE EXAMPLE 50.002 of tridemorph 30.002 of phosphonic acid 20.002 of propylene glycol 30 Concentration used Appearance of the 10 test timbers 2.52 +++ .02 +++ EXAMPLE 1 (according to the invention) 50.002 of dimethyl-C-|2/Cl4-a'-kylamine 35 10.002 of 2-ethylhexanoic acid 15-002 of phosphonic acid 25.002 of propylene glycol 22 6 72 1 03^ ¥ 0.2 . 0975/00064 Board No .

Appearanc e of t he test t imber s 2.52 use 52 use concentratton concentrat ion 1 0 2 +• +> 0 3 0 4 * 4- ♦ 0 6 0 + 7 + ♦ 8 + + 9 0 0 EXAMPLE 2 1 5 .002 0 f dimethyl-C-j2^-j4-alkylaniine .002 o f tridemorph .002 of phosphonic acid .002 of propylene glycol Board No.

Appearance of t h e tes t timbe rs 2.52 use 52 use concentration concentration 1 + 0 2 +■ + 3 + + 0 4 0 0 0 0 6 0 7 + 0 8 0 0 9 0 0 + + +■ EXAMPLE 3 .002 0 f dimethyl-C •jj/C-^-alkylamine .00% of t ri demorph .00% of isooctanoic acid .00% of 85% strength lactic acid (152 of water) V 22 6 7 2 - 7 - 0.2. 0975/00064 Board No. Appearance of the 10 test timbers 2 . 5 % u s e 5 % u s e concentration concentration 1 * 2 0 3 4 0 0 0 6 * +■ 10 7 8 ^ 0 9 * ♦ 10 * + 0 COMPARISON 25.005: of 2-(raethoxycarbonylamino)-benzimidazoLe 37.502 of phosphonic acid 37.50% of water Cone entration used Appearance of the 10 test timbers 0.25% ♦ 0.50% 1.00% +++ 1.50% * + + EXAMPLE 4 .00% of dimethyl-Ci2^c-14-a'-'<:y'-an'''ne 25 20.00% of tridemorph .00% of 2-ethyI hex a noic acid 30.00% of phosphonic acid 5.00% of N-methyIpyrroIidone .00% of 2-(methoxycarbonylamino)-benrimidazole 22 6 7 2 1 fc. - 8 - O.Z. 0975/00064 Board No. Appearance of Che 10 test timbers Concentration used 2-02 3.02 4.02 1 0-0 2 0 * 3 0-0 4 0 0 0 0 0 6 0 0 0 10 7 0 0 0 8 0 0 9 0 0 10 0 0 0 COMPARATIVE EXAMPLE 3CM 15 50.X of 2-(methokycarbony I amino)-benzimida 20Le 502 of sulfamic aid (converted in a kneader under reduced pressure) Concentration used Appearance of the ten test timbers after weathering 20 0.252 +++ 0.502 +++ 1.002 ++- EXAMPLE 5 (according to the invention) 47 .52 of »<■ o • of .02 0 f 7 .52 of .02 of 8 CM * 22 6 7 2 1 0.

Z. 0975/00064 8 0 a r d No.

Appearance of the test timbers C 0 n c e n t r a t ion used 2.52 3.52 .02 1 *• + «4» 2 +■ ♦ 0 3 + +■ 4 0 0 0 0 ♦ 6 ♦ +• 0 7 0 8 - 0 9 ♦ + «♦» 0 0 + EXAMPLE 6 40.02 of d i me t h y I-C 2 / C ^ 4-a I k y I am i ne 40.02 of phosphonic acid of N-methylpyrrolidone of BCM .02 10.02 Board No.

Appearance of the test timbers Concentration used 1.52 2.OX 3 1 + + 2 + + + + 3 + 0 4 + + 0 •f + 0 6 + + 7 + 0 + 8 +■ + 9 4- 0 + + + ALL test timbers which had not been treated were covered with bLue stain fungi and were discolored (+■»•+).

Another mixture having a : :od fungicidal action is the following: % of d i me t hy I-C 12 ^ C 14~a ^y I am i ne 20% of tridemorph 22 6 7 2 t - 10 - 0.2. 0975/0006^ % of ethyI hexa noic acid 30X of phosphonic acid 5% of N-methylpyrrolidone

Claims (6)

WHAT WE CLAIM IS:

1. A wood preservative comprising: (a) a dimethylalkylamine in which the alkyl contains 6 to 20 carbon atoms, the dimethylalkylamine being present in an amount from 5% to 75% by mass; (b) a water-soluble acid in an amount from 2.5 to 50% by mass; and (c) 0 to 25% by mass of a water-insoluble acid or 0 to 25% by mass of 2-(methoxycarbonyl amino)-benzimidazole, or both, with at least one always present, all components together making up 100% of the wood preservative.

2. A wood preservative as claimed in claim 1, which additionally contains N-tridecyl-2,6-dimethylmorpholine.

3. A wood preservative as claimed in claim 1, which contains phosphonic acid as the water-soluble acid.

4. A wood preservative as claimed in claim 1, which contains 2-ethylhexonoic acid as the water-insoluble acid.

5. A process for preserving wood, wherein the wood is treated with a wood preservative as claimed in any one of claims 1 to 4.

6. A wood preservative according to claim 1 and substantially as described in this specification with reference to any one of examples 1 to 6. PR WtiLM&N GMBH by, their attorneys' BALDWIN, SON & tZAREY