RU2572121C1 - Protective and decorative agent for wood materials - Google Patents

Abstract

FIELD: woodworking industry.

SUBSTANCE: protective and decorative agent comprises boroxan and turpentine gum. The turpentine gum containing 65% pine rosin and 35% turpentine is used.

EFFECT: invention imparts the surface a decorative appearance and provides the biological resistance against mould and staining fungi.

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Description

The invention relates to preparations for the protection and decorative processing of wood and materials based on it in order to give the surface a decorative appearance and biological resistance against mold and staining fungi. The drug can be used in construction, as well as in all sectors of the economy that use wood and wood products.

Known bioprotective drug (French patent N 2251417, CL B27K 3/52, 1975) [1], containing, g: 5-50 film-forming in the form of liquid oils or synthetic resins, for example alkyd resin, 0-6 pigment, 1-10 a biocidal substance, for example pentaphtholate, 40-85 of one, or a mixture of conventional petroleum solvents, for example white spirit, including 2-20% methyl-2-pyrrolidine.

The specified preparation is intended for bioprotection and decorative finishing of wood, contains synthetic resin, antiseptic additive, pigment and solvent. However, when applied to wood, the composition does not provide a uniform coating, and the synthetic component does not have time to evenly distribute in the protective film and is in it in an undissolved state due to the high speed of drying and polymerisation of the resin. In addition, the composition includes deficient components.

Also known wood-protective composition PF-11 (TU 6-27-8-90 "Composition of wood-protective PF-11" [2], which is a solution of alkyd resins in organic solvents with the addition of modifying and fungicidal additives.

The use of the composition is not technologically advanced due to the curing time of the film-forming resins. Products treated with the composition have low protective and decorative finishes, which do not allow for the protection of wood that is stable over time.

Known protective and decorative composition for coating wood (Russian Patent RU No. 2065465 C1, IPC ⁶ C09D 101/18, C09D5 / 28) [3] containing nitrocellulose varnish based on colloxylin 95-97%, boroxane is a product of the interaction of a light fraction of high-boiling by-products the products of the synthesis process of 4,4-dimethyl-1,3-dioxane with boric acid 3-5% (prototype).

The disadvantage of this composition is the low bioprotective effectiveness against molds Aspergillus niger and Penicillium chrisogenum.

The aim of the present invention is to obtain a drug with increased protective ability in relation to the most common types of mold and wood-staining fungi in Russia.

The goal is achieved by replacing in the composition of nitrocellulose varnish purified by decantation of pine resin (purified turpentine), which is a transparent resinous liquid containing 65% rosin and 35% turpentine [4].

The composition is easy to use, when applied to wood, a uniform coating is provided and, as a result, the service life of the protective and decorative coating is increased. To test the proposed drug, samples were prepared with different component contents. The compositions are shown in table 1.

Table 1 Drug component Wt% Famous (prototype) Composition 1 Composition 2 Varnish NTs-218 95 - - Boroxane 5 5 3 Zhivitsa pine (turpentine) 95 97

The toxicity of the compounds in relation to blue stain and mold fungi was determined according to GOST 30028.4. The test was conducted on 27 species of mushrooms, comprising 3 groups of 9 species each (table 2).

table 2 The main groups of wood and mold fungi. first group second group third group Penicillium ochrochloron, Aspergillus terreus, Fusarium monilifbrme, Penicillium brevi-compactum, Fusarium poae, Aspergillus niger, Penicillium chrisogenum, Altemaria humicola, Phialophora fastigiata. Fusarium javanicum, Fusarium merismoides, Paecylomyces varioti, Sporodesmium cladosporioides, Trichosporium heteromorphum, Aspergillus hennebergii, Discula pinicola, Cladosporium herbarum, Verticillium marguandi. Aspergillus amstelodanum, Penicillium cyclopium, Altemaria tenuis, Aureobasidium pullulans, Fusarium culmorum, Penicillium purpurogenum, Aspergillus flavus, Leptographium lundbergii, Trichosporium harzianum.

Evaluation of the effectiveness of the protective agent in accordance with the requirements of GOST 30028.4 was carried out after 15 days of exposure on the average area affected by the fungi of the surface of the samples in percent and on the stage of development of the fungus. The degree of development of the fungus and wood damage were evaluated on a scale:

0 - absolutely pure samples during visual inspection and under a microscope;

1 - visually clean samples: when examined under a microscope, small foci are visible in the form of spots of one type of wood-staining or mold fungi; sporulation stage is absent;

2 - surface development of mycelium of certain types of wood-staining and mold fungi in the form of spots; sporulation stage is absent;

3 - abundant growth of the mycelium of certain types of wood-staining or mold fungi; the beginning of the sporulation stage of one of the species of fungi;

4 - fungal growth is clearly visible during visual inspection, various stages of sporulation of most species of wood-staining and mold fungi;

5 - deep damage by wood-dyeing and mold fungi of the entire area of the sample, intensive sporulation.

The results of a study of the effectiveness of the protective agent against molds of Aspergillus niger are presented in table 3.

Table 3 Evaluation of the effectiveness of the proposed drug No. p / p A drug Degree of damage,% of area (GOST 30028.4) Score one Famous (prototype) 40 3 2 Composition 1 10 2 3 Composition 2 5 one

Products treated with the proposed drug have high protective and decorative indicators, which allow for stable and long-term protection of wood.

The effectiveness of the proposed drug is 30-40% higher in relation to molds Aspergillus niger and Penicillium chrisogenum.

The composition is easy to use, when applying it to wood, a uniform coating is provided and, as a result, the service life of the protective and decorative coating is increased, which allows to expand the scope of its application.

Sources of information accepted during the examination

1. French patent N2251417.

2. TU 6-27-8-90 "Composition of wood-protecting PF-11."

3. Patent of Russia RU No. 2065465 (prototype).

4. Directory of wood chemist. M. 1974. Ed. Timber industry.

Claims (1)

Protective and decorative preparation for wood materials based on boroxan and peeled pine resin (terpentine) containing 65% rosin and 35% turpentine, wt.%:
Boroxane 3 Sap 97