RU2265633C1 - Composition to form protective-decorative coatings for wood - Google Patents

Abstract

FIELD: protective coatings.

SUBSTANCE: composition contains perchlorovinyl resin, titanium dioxide filler, pigment , and solvent, wherein solvent is ethyl acetate or dichloromethane and ethyl acetate, or dichloromethane and acetone.

EFFECT: shortened drying time, simplified composition, and reduced toxicity.

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Description

The invention relates to the field of protective coatings, in particular decorative wood coatings.

The known composition of the film coating for temporary corrosion protection of the surfaces of parts, including enamel XB-114 based on perchlorovinyl resin and corrosion inhibitor D-2 based on quinoline (RF Patent No. 2034855, 09 D 127/6, 1995).

The proposed components are contained in the composition in the following amount, wt.%:

Enamel ХВ-114 based on perchlorovinyl resin 92-94 Complex corrosion inhibitor Quinoline D-2 6-8

The composition is intended for temporary anticorrosive protection and can be used in ship-, instrument-, and mechanical engineering.

The disadvantage of the composition is the presence in its composition of a toxic substance - a pyridine base - quinoline, as well as low adhesion of the resulting coating to the substrate, since after some time the coating is easily removed in the form of a film.

Known protective composition for painting metal, wooden, concrete surfaces (RF Patent. No. 2091416, C 09 D 125/06. 1997). The composition includes the following components, wt.%:

Expanded polystyrene 6.8-7.9 Epoxy resin 5.5-6.5 PSH-LS Perchlorvinyl Resin 3.9-4.7 Pigment 14.7-23.6 Filler 9.3-16.6 Hardener - 50% solution of hexamethylenediamine in ethyl alcohol Solvent - the rest

The protective composition is a two-component system consisting of a semi-finished composition and a hardener, mixed before use. The semi-finished product is a suspension of pigments and fillers in a solution of expanded polystyrene, epoxy and perchlorovinyl resins in organic solvents. As a solvent, xylene, solvent, turpentine are used. Perchlorovinyl resin is soaked in xylene, a 20% solution is prepared. The components of the composition are mixed in a high-speed mixer - desolver, and then the resulting suspension is fed into a ball mill for dispersion.

The composition has the following disadvantages:

- long drying time of the coating due to the use of high-boiling solvents (xylene, solvent, turpentine):

- the composition is two-component, which complicates its use;

- the composition is toxic due to the content of epoxy resin (MPC - 1 mg / m ³ ) and hexamethylenediamine (MPC _R.Z - 1 mg / m ³ ).

The objective of the invention is to reduce the drying time of the applied coating, simplifying the composition, reducing its toxicity.

To solve this problem, a composition is proposed for protective and decorative coatings of wood, including PSX-LS perchlorvinyl resin, a filler is titanium dioxide, a pigment and a solvent, which according to the invention contains ethyl acetate or dichloromethylene and ethyl acetate, or dichloromethylene and acetone as a solvent, in the following ratio components (wt.%):

PSH-LS Perchlorvinyl Resin 22-24 Pigment 10-22 Filler (titanium dioxide) 10-20 The solvent is ethyl acetate, or dichloromethylene and ethyl acetate, or dichloromethylene and acetone - the rest.

As perchlorovinyl resin take emulsion resin brand PSX-LS. As pigments, dry organic pigments of various colors (five dyes in total: zinc white, phthalocyanine green and blue, cadmium red and ocher), by mixing of which 18 different colors are obtained.

The method of preparation of the compositions is simple. It consists in the dosage of the components in the above ratio, their subsequent mixing and grinding until a homogeneous mass is obtained.

The process of preparing the composition is illustrated by the following example:

Example 1

40 parts of ethyl acetate and 22 parts of perchlorovinyl resin are placed in a mixer equipped with a stirrer and a cooling jacket, the mixture is stirred for 30 minutes, after which 16 parts of titanium dioxide are added to the content and stirring is continued for another 15 minutes. Then, 22 parts of dry organic dye are introduced into the resulting mass and stirring is continued for another 15 minutes. Then the resulting mass is ground in a mill (ball or bead).

The resulting composition is applied to wooden surfaces. Drying time - 90 sec. Adhesion - 2.3 MPa. Spreading rate - 90 g / m ² .

Other examples of the preparation of compositions and test results of coatings based on them are presented in table 1.

Table 1 No. p / p Name of components The quantitative content of the components, wt.% 1 2 3 4 5 6 7 8 nine 10 eleven 1 PSH-LS Perchlorvinyl Resin 22 22 22 22 24 22 22 24 23 23 23 2 Ethyl acetate 40 37 3 58 fifty 3 Dichloromethylene 3 37 twenty 5 35 6 25 10 thirty 4 Acetone twenty 35 5 45 thirty 10 5 Titanium dioxide 16 16 16 twenty twenty twenty 10 eleven eighteen 19 19 6 Pigment (name) 22 phthalocyanine green 22 phthalocyanine blue 22 cadmium red 18 ocher 16 phthalocyanine green 18 cadmium red 10 ocher 19 ocher 19 phthalocyanine blue 18 ocher 18 cadmium red Adhesion, MPa 2,3 2.2 2,4 2.1 2,3 2,3 3.2 3 2,5 2.6 2,5 Drying speed, s 90 55 fifty 92 90 85 120 110 116 63 55 Spreading rate, g / m ² 90 90 90 80 80 80 130 130 80 85 85

As can be seen from the table, based on the proposed composition, coatings with high adhesion and hiding power were obtained, which allows it to be widely used in the manufacture of wood products. The composition is non-toxic, the drying time when applied is from 50 to 120 s, as a result of which it can be recommended for coatings in the manufacture of pencils.

Claims (1)

Composition for protective and decorative coatings of wood, including PSX-LS perchlorvinyl resin, filler - titanium dioxide, pigment and solvent, characterized in that it contains ethyl acetate or dichloromethylene and ethyl acetate or dichloromethylene and acetone in the following ratio components, wt.%: PSH-LS Perchlorvinyl Resin 22-24 Pigment 10-22 Titanium Dioxide Filler 10-20 The solvent is ethyl acetate, or dichloromethylene and ethyl acetate, or dichloromethylene and acetone Rest