SU1493646A1 - Composition for producing hydrophobic coatings - Google Patents

Abstract

THE INVENTION RELATES TO COMPOSITIONS FOR OBTAINING HYDROPHOBIC COATINGS WITH THE USE OF WATER-DRAINED VARNISH AND PAINT MATERIALS. SOFTWARE THE PURPOSE OF THE INVENTION IS THE STABILIZATION OF HYDROPHOBIC PROPERTIES OF COATING IN TIME. FOR THIS LOCAL NAME 2-METHYL-5-VINYL-1-METHYLENE PENTAMETYLEDISYLOXYPYRIDINIDE IODIDE FORMULA @ AMOUNTED 0.1-3.0 MAC.%. 1 TABLE

Description

The invention relates to compositions for the preparation of hydrophobic coatings using water-borne paints and varnishes, which can be used as waterproof, chemically resistant and protective coatings for chemical equipment, especially in cases where minimum coating thickness is required, in particular when protecting pipes

condensers of heat exchangers when the thickness of the coating should be no more than 10 microns.

The purpose of the invention is to stabilize the hydrophobic properties of the coating over time.

A composition for the preparation of a hypophobic coating is prepared as follows.

Water-borne paints and varnishes in the form of an acidic paste with an acid number of 40-150 based on alkyd-epoxy binders (EP-2100 enamel according to VTU LF 7-12-72), rehydrol (a low-alloyed product of dehydrated castor and flax oil) and acrylic binders (enamel BAC-P75 according to TU LF 7-18- 73).

The acidic paste is neutralized with an amino content of a water-soluble base (about 8 g per 100 g of undiluted paste) with constant stirring and a temperature not exceeding. After neutralization, add deionized water in an amount corresponding to the amount of primer taken, mix and add the remaining water with continuous stirring to a concentration of 5-15%. After dilution, the pH is adjusted with the amine-containing product.

Then, the required amount of an aqueous dispersion of PTFE (MRTU 6-05-1246-69) is added to the prepared solution, and the organosilicon modifying agent, previously dissolved in a small amount of the selected solution, is introduced with continuous stirring.

The coated surface of the heat exchanger is cleaned on a sand blasting unit and degreased with technical washings, using KM-1 type tools.

The prepared heat exchanger (sludge; Separate pipes for the heat exchanger) is lowered by cathodes into the vessel, into which the paint and varnish material mixed with the fluoroplastic dispersion and the silicone modifier is poured. Bath temperature

The process of electrodeposition is carried out at a voltage of 50-150 V for 30–180 s. The coated product is dried for 30-40 minutes at 180-220 ° C, and then at t 260-280 0 for 20-40 minutes.

Example 1. Acrylic copolymers based on acrylic copolymers (VAMS) water-borne paint, coming in neutralized form with a dry matter content of 8.0 wt.%. and pH 8.3-8.8, add 20 wt.% 50% aqueous dispersion of fluoroplast brand F-4D, 51.9 wt.% water and stir for 1.5 hours. Then 0 is added to the composition, 1 wt.% Silicone modifier of the formula.

sn r

Si-O-Si-CH;

I

sn

3

Si-,

and stirred for another 30 minutes Electrodeposition is carried out at and 90 V and € 120 s. The hydrophobic coating is obtained at the anode. Steel, aluminum, brass and brass alloys can be used as an anode.

After electroplating, the coating is rinsed with water, dried at 180 ° C for 20 minutes, and edtem is melted at 280 ° C for 20 minutes.

The properties of the coating of example 1 are shown in the table.

Example 2. In a water-based paint material based on melamine-formaldehyde resin, which arrives in neutralized form with a dry matter content of 15% by weight and pH 8.7, is added 28.5% by weight of an aqueous dispersion of fluoroplast F-4D, 26 , 25% by weight of water and stirred for 1.5 hours. Then 1.75% by weight of an organosilicon modifier was added to the composition and stirred for another 30 minutes. Electrodeposition is then carried out at U 90 V and S 20 s. After electroplating, the coating is washed with water and dried at 180 ° C for 20 minutes, melted for 20 minutes.

The properties of the coating of Example 2 are shown in the table.

Example 3. In a water-based paintwork material based on an alkyd-epoxy resin (VEP-2100), supplied in neutralized form with a dry matter content of 10% by weight and pH 9.0, 37% by weight 50% is added an aqueous suspension of fluoroplast grade F-4D, 13 wt.% water and stirred for 1.5 hours. Then, 3.0 wt.% silicone modifier was added to the composition and mixed for another 30 minutes. Electrodeposition is then carried out at U 90 V, C for 120 s. After electrodeposition, the coating is rinsed with water and dried, | at min

51

and melted at 20 minutes.

The properties of the coating of example 3 are shown in the table.

Example 4. In water-based paintwork material based on alkyd-epoxy resin (VEP-2100), arriving in a neutralized form with a solids content of 10 May. 7, and a pH of 9.0, is added on 37 May. 7, a 50% aqueous dispersion of fluoroplastic F-4D, 16 wt.% Of water and stirred for 1.5 hours. Electrodeposition is carried out at and 90 Bu1 120 sec. . After electrodeposition, the coating is washed with water and dried at t 180 ° C for 20 minutes, then at 20 minutes.

The properties of the coating in Example A are shown in the table.

The table also shows the properties of hydrophobic coatings obtained using a hydrophobic additive of an organosilicon compound such as tetraethoxysilane (reference examples 5-7).

Claims (1)

Invention Formula 936466 further editable. paintwork material based on alkyd-epoxy resin, acrylic resin or maleized products with additives of fluoroplast water dispersion, characterized in that, in order to stabilize the hydrophobic properties of the coating over time, the composition additionally) 0 contains 2-methyl-5-vinyl-1- methylene pentameptidysyloxypyridine iodide of the formula at the following ratio of components, wt.%: A solution of waterborne paints and varnishes (in terms of dry matter) 5-15 2-methyl-5-vinyl-1-methylene pentamethyldisilipyridine iodide 0.1-3.0  water dis