The method of obtaining anti-corrosive composition

 

(57) Abstract:

Usage: for application over primed metal, wood, plaster and other porous surfaces exposed to atmospheric influences and indoors. The inventive method of obtaining anti-corrosive composition is made by preparing a solution of Novolac phenol-formaldehyde resin in an organic solvent and subsequent mixing it with three or tetrachromats zinc. Then to the mixture with stirring, add the remaining components of unsaturated alkyd pentaftalevyh resin, pigments, solvents. The components of the composition can be selected in the following ratios,wt.h.: unsaturated alkyd resin 100, navrachna phenol-formaldehyde resin is 50 to 100, pigments 250-340, desiccant 8-14, organic solvents 125-170, three - or tetrachromat zinc 5-20 including Characteristics of properties: conditional resistance film 6 h drying time at 202oC to degree 1 - 0.5 h, to the extent 3 to 4.0 h, the adhesion 1 point, the hardness of the film of 0.5-0.7, elasticity of 1 mm, a permeability of 1.0-1.2 mg/cm day, water resistance 148-160 h, cholestanol 48 hours 1 C.p. f-crystals, 2 tab.

The invention relates to the region is named, wood, plaster and other porous surfaces exposed to atmospheric influences, and indoors.

Known methods for producing anti-corrosion formulations based on alkyd resins in combination with phenol-formaldehyde oligomers /1/.

The closest in technical essence to the claimed invention is a method for enamel by mixing Novolac phenol-formaldehyde resin, unsaturated alkyd /pentaftalevyh/ resin, pigments /titanium dioxide, iron oxide pigments, ochre, red lead, etc./ fillers /calcite, barite, talc, Aerosil and others/, drying agent and organic solvents white spirit, xylene, nefras/ and special additives/ epoxy resin, vegetable oil/. Enamel is prepared by pre-mixing the phenol-formaldehyde resin and vegetable oil by heating, followed by combining the resulting product with alkyd resin, epoxy resin, fillers, pigments and organic solvents /2/.

Paint /enamel/ obtained in a known manner, does not have the necessary resistance, adhesion, water resistance, santonocito and has a long drying time.

ICO-mechanical and protective properties.

This object is achieved in that in the method of preparation of the anti-corrosive composition by mixing unsaturated pentaftalevoj /alkyd resin/, Novolac phenol-formaldehyde resin, pigments, drying agent and organic solvents, first prepare a solution of Novolac phenol-formaldehyde resin in an organic solvent and mix it with three or tetrachromats zinc, and then to the resulting mixture with stirring, add the remaining components.

The quantitative content of the components is not in this invention the determining factor to achieve a technical result, and only additionally illustrates the method, i.e., incoming components taken in the following ratio,wt.h.

Unsaturated alkyl resin 100,0

Novolac phenol-formaldehyde resin 50-100

Pigments 250-340

Desiccant 8-14

Organic solvents 125-170

Three or tetrachromat zinc 5-20

The method is used:

1. Solutions of alkyd resin in a mixture of xylene and white spirit or xylene and solvent: varnish alkyd unified /TU 301-10-0-352-91, S. N. 56%/, varnish alkyd semi-PF-060/TU 6-10-612-75, S. N. 53%/, varnish alkyd semi-PF-053 (TU-6-10-612-75, C. the PRS in xylene phenol-formadehyde resin L /TU 6-10-1824-81/.

3. Pigments: zinc white /GOST 202-84/, pigment red iron oxide /THE 6-10-602-86/ phosphate chromium /TU 6-18-87-85/ carbon THE technical /GOST 7885-86/ ochre /OST 6-10-430-80, MEAs. 1/ and others.

4. Driers: fatty acid /LCD 1, THE 6-10-1641-86 LCD 12, THE 6-21-0204150-1-90/ and fused /64B; P, THE 6-10-135-1-78/ and others.

5. Tricerat zinc ZnCrO43Zn(OH)2tetrachromat zinc ZnCrO44Zn(OH)2/GOST 16763-79/.

In addition to these components, the introduction of filler, for example, carbonate /TU 301-10-025-90/ and specific additives.

A solution of phenol-formaldehyde resin with three or tetrachromats zinc mix in for 10-30 min at room temperature.

Below are examples of implementation of this method.

Example 1. In high-speed dissolver download solution of phenol-formaldehyde resin in xylene /S. N. 60%) in the amount of 50 kg /calculated on the dry matter/ and tetrachromat zinc in the amount of 11.6 kg and stirred for 30 min at a temperature of 20oC. Then, while operating the stirrer download solution of an alkyd resin in a mixture of xylene and white spirit in a ratio of 3:2 in the amount of 100 kg /calculated on the dry matter/ and of 200.0 kg of pigment red iron oxide, 4,50 kg of phosphinite for dispersion.

After dispersion of the pigment paste comes in tinting the mixer, where to download the desiccant LCD 1 of 14 kg and stirred for 30 minutes the Finished structure after activating the "type" in color and viscosity enters the filter on the filter "Kuno" and poured into containers.

Examples 2,3 /table. 1/ different blending phenol-formaldehyde resin with three or tetrachromats zinc /in example 2-10 min in example 3-90 min) and the ratio of the components, carry out technological scheme similar to the scheme of example 1.

The composition obtained by the proposed method, applied by brush, roller, method of air or airless spray.

The results of the authors of the test composition obtained by the proposed method, in comparison with the composition obtained by the method prototype is presented in table.2.

1. The method of obtaining anti-corrosive composition by mixing unsaturated pentaftalevyh alkyd resins, phenol-formaldehyde Novolac resins, pigments, drying agent and organic solvents, characterized in that the first prepare a solution of Novolac phenol-formaldehyde resin in an organic solvent and mix it with three or Terr> 2. The method according to p. 1, characterized in that the ingredients are taken in the following ratio, wt.h:

Unsaturated pentaftalevyh resin 100

Novolac phenol-formaldehyde resin 50 100

Pigments 250 340

Desiccant 8 14

Organic solvents 125 170

Three or tetrachromat zinc 5 20

 

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