SU1438957A1 - Composition for protecting wood from rotting - Google Patents

Abstract

The invention can be used in the construction and repair of buildings, structures and objects of various types that are prone to decay. The purpose of the invention is to reduce the harmfulness of the drug by eliminating the impregnation solution and impregnated wood from hydrogen fluoride and reducing the corrosivity of the drug. The drug contains, wt%: sodium bichromate II – P; copper sulfate 11-17, ammonium fluoride 29-33, soda ash 38-45. The required stable solutions are obtained by dissolving its components in the indicated proportions in water. Usually use solutions of 5-15% concentration. 3 tab. (Oh cl

Description

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The invention relates to the Protection of wood from rotting and can be used in the construction and repair of buildings, structures and objects of various types that are prone to rotting.

The purpose of the invention is to reduce the hazard of the drug by eliminating the release of hydrogen fluoride from the impregnating solution and the impregnated wood and reducing the corrosivity of the drug.

Example 1. A preparation containing wt.% Is prepared: sodium bichromate 11; copper sulfate 11; ammonium fluoride 33; soda ash 45,

EXAMPLE 2. A preparation is prepared containing a wt.%: Sodium dichromate 14; copper sulfate 14; ammonium fluoride 30; soda ash 42.

EXAMPLE 3 A preparation is prepared containing, by weight,%: sodium bichromate 17; copper sulfate 17; ammonium fluoride 28; soda ash 38.

A decrease in the content of sodium bichromate and copper sulphate leads to a sharp decrease in the bioprotective properties of the preparations, while a decrease in the proportion of ammonium fluoride and soda ash leads to instability of solutions and even the formation of precipitation. An increase in the amount of sodium bichromate and copper sulfate is also impractical because it requires the introduction of a large amount of soda ash and ammonium fluoride, as a result of which the protective effect of the preparation is again reduced.

Copper sulphate is a blue crystalline dry product, soluble in water and water-alcohol solutions.

Sodium or potassium dichromate is an orange crystalline dry product, soluble in water.

Ammonium fluoride is a white crystalline powder, soluble in water, when decomposed. Soda ash is a white dry powder, soluble in

14389572

water, hygroscopic, absorbs CO2

0

five

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from the air.

The required stable solutions are obtained by dissolving the components in the indicated proportions in water. Usually use solutions of 5-15% concentration.

Solutions of the proposed drug have a bright green color, a well-known drug - brownish green. They are all aqueous and have a density close to 1 g / cm. .

The toxicity of the drug in relation to wood-destroying fungi is assessed according to GOST 16712-71. For each variant of the experiment, in accordance with the requirements of the standard, 9 samples of 20 x 20 x 5 mm pine sapwood are tested.

The test results are presented in table. 1 .Table 1

A drug

Threshold. %

absorb30

By example

Thus, the toxicity of all three modifications of the proposed preparation is higher than the known toxicity.

. Corrosion aggressiveness of solutions of 8% concentration is assessed by ST SEV 4685-84. For each variant of the experiment, 9 plates of art. Z with dimensions 75x75x1 mm are tested.

The results of the experiment are presented in table. 2

Table 2

Claims (1)

Claim A preparation for protecting wood from rotting, including sodium dichromate and copper sulfate, characterized in that, in order to reduce the harmfulness of the preparation by eliminating A drug Content, mg / l, hydrogen fluoride in the air above the bath hot j cold Following the example 1 Traces Traces 2 Not Not division from the impregnating solution and the impregnated wood of hydrogen fluoride and reducing the corrosiveness of the drug, it additionally contains ammonium fluoride and soda ash in the following ratio, wt.%: Sodium bichromate 11-17 Copper sulphate 11-17 Ammonium fluoride Calcined 28-33 soda' 38-45 VNIIIPI Order 6011/17 ____ Circulation 472 ________ Signed Custom polygr. ave, city of Uzhhorod, st. Project, 4