SU1165685A1 - Method of protecting surface of optical components from biological growth - Google Patents

Abstract

S110 COB OF PROTECTION OF THE OPTICAL DETAILS SURFACE FROM BIOLOGICAL PROCESSES, including surface treatment with vii-containing organosilicon compounds, heat treatment and subsequent treatment of the resulting coating with a 0.2-0.4% aqueous solution of mercury acetate, in order, in order, with the aim of the purpose, with the purpose of coating with a 0.2-0.4% aqueous solution of mercury acetate with different targets, in order to achieve the same targets as in order to get a coating with a 0.2-0.4% aqueous solution of mercury acetate with different targets, with the aim of drawing a target with a target solution of 0.2–0.4% mercury acetate, with the aim of making it possible to do this. , the life of the protective coating, in the quality of the vinyl-containing organosilicon compound, a mixture of 0.2-0.4% solution in ethyl acetate of polydimethylmethylvinylheterophosphorsiloxane is used s CHj oznz / / / l H0-f5i04 (P-o4 (SioA-H 1 / n H t I If CHZ ONSN CHS where n 475-500;, 0-1,6;., 0-1,6., (L molecular weight 35000-37000 and 60% aqueous solution of tetraethoxysilane v. Ethanol with a volume ratio of solutions

Description

The invention relates to optical production, specifically to the technology of creating thin coatings with fungicidal properties for optical instruments in a tropical design. Methods are known for protecting the surface of optical parts from biological fouling by coating a surface based on a heterophosphorsiloxane tec (GSF-3), tetraethoxysilane, and triethylmethacryl hydroxyethane (TEMS) pJ, as well as coatings based on alcohol solutions of vinyltriotoxysilane (TeTeTeTe), and a TeTeTetoxicone; DMDES) mercury acetate in methanol C2. However, the coatings obtained by these methods under the conditions of a humid tropical climate do not preserve their original fungicidal properties for a long time. The closest to the invention of the technical nature is the method of protecting the surface of optical components from biological fouling, including surface treatment with vinyl-containing organosilicon compounds (vinylclaimerile ethoxysilane heat treatment and subsequent treatment of the resulting coating with 0.20, 4% mercury acetate solution in distilled water 3 J. However, the coating obtained in a known manner is not sufficiently effective and has an insufficient service life (it has mushroom resistance for 6–8 months. As per GOST 9.048-75). of the invention - an increase in the efficiency and an increase in the service life of the protective coating. The aim is achieved by the fact that, with the method of protecting the surface of optical components from biological fouling, including surface treatment with a vinyl-containing organosilicon compound, heat treatment and subsequent processing of the resulting coating, 0.20, 4% aqueous solution of mercury acetate, as a winn-containing organosilicon compound, use a mixture of 0.2-0.4% solution of polydimethylvinylheterophosphorsiloxane (FS-3) of the general formula CH3 oO2 / I / II / I HOf $ 104-P-0-) - 3i04-H I / n H / mil t CHz OH. where n 475-500; . , 0-1.6 i M, 0-1.6; molar mass 35000-37000 and 60% aqueous solution of tetraethoxysilane (TPP) in ethyl alcohol with a volume ratio of solutions (18-20): 1, and heat treatment is carried out at 1 95-200 0. A mixture of 0 is applied to the surface of the part, 2-0.4% solution of polydimethylmethylvinylheterophosphorsiloxane in ethyl acetate and 60% solution of tetraethoxysilane in ethanol in the ratio (18-20): 1, as a result of which a strong molecular film is formed on the surface after heat treatment. The coating is hydrophobic and protects the surfaces of optical components from exposure to Air lags. In order to impart fungicidal properties to the coating, it is treated with an aqueous solution of A. mercury acetate. In this case, mercury acetate is attached to the vinyl groups of the polymer coating. The resulting hydrophobic-fungicidal coating, without altering the optical properties of the glass, protects the optical components. moisture in the air and from biological objects. Polydimethylmethylvinylheterophosphorusiloxane provides the high hydrophobic properties of the resulting coating and the possibility of imparting fungicidal properties to it by attaching mercuric acetate to the phosphorosiloxane grouping in its composition, which determines the good adhesion of the films to the glasses. I Tetraethoxysilane provides chemical bonding of the coating to the glass surface and the formation of a crosslinked surface of the films, which increases the mechanical strength of the coating and its abrasion resistance. Mercuric acetate, which is attached by vinylsiloxane groups, forms a polymer kurgangansiloxane coating, which, in addition to hydrophobic, also has fungicidal properties3. one

you. The presence of a chemical bond of mercury atoms with the coating material ensures its long-lasting fungicidal. activity under operating conditions.

Polydimethylmethyl-Ninylheterophosphorosiloxane of the general formula

SNL

ABOUT

CH

I

II

) Jt-i () -t

CHj he CHj

four. .

where p 475-500;

, 0-1,6;

, 0-1,6,.

Mol. mass 35000-37000, obtained by condensation of polydimethylvinsiloxane general formula

sn,

HOt $ iO;

V I //

f

CHj

where n 475-500; , 0-1,6,

with soft phosphoric acid in mild CONDITIONS at a temperature not higher than 120 ° C, ensuring the simultaneous presence in the polymer of phosphorsiloxane fragments in the chain of methylvinylsiloxane units.

Polydimethylvinylheterophosphorsiloxanes contain, according to averaged analyzes, 0.08-0.12 wt.% Phosphorus, 0.20-0.32 wt.% CH3 () 510 units, the total content of the OH group, including hydroxyl groups at the phosphorus atoms, is 0.12- 0.14 wt.%.

The main characteristics of the polymers used are listed in Table 1.

The tetraethoxysilane used for the preparation of the coating corresponds to indicators TU 6-09 3687-74, grade, hpa.

Mercury acetate corresponds to GOST 5509-51, grade ch.d.a.

Example. Prepare two solutions for the previously: 0.2-0.4% solution of polydimethylmethylvinylheterophosphorsiloxane in distilled ethyl acetate (analytical grade GOST 8981-71) and 60% 6854.

a solution of tetraethoxysilane in 70% ethyl alcohol (GOST 18300-72) acidified with hydrochloric acid (HCf or.h. GOST 14261-77) at the rate of 0.1 ml of acid per 100 ml of solution. Both solutions are allowed to dissolve and mature for 2 days. The solutions are drained in a ratio of 18-20 parts of O, 2-0.4% solution

polydimethylvinylheterophosphorsiloxane and 1 part of 60% tetraethoxysilane. The next day, the solution is ready for use.

The coating is applied to the surface.

optical parts by the centrifugal method. Then the coated parts are heated in a thermostat at 195–200 ° C for 50–60 minutes and, after cooling, treated with a 0.2–0.4% solution of mercury acetate in distilled water for 110–120 minutes at room temperature.

This results in a uniform thin layer coating, which effectively and for a long time protects the optical components from moisture in the air and from biological fouling. When changing these ratios, reagents, temperature and time

warming up the coating is either ineffective or mechanically unstable.

The parts protected by the proposed method were tested for mushroom resistance under laboratory conditions

GOST 9.048-75 and under the natural conditions of the Soviet subtropics in accordance with GOST 9.053-75.

The number of processing agents, the technological parameters of the method carried out and the properties of the coatings are presented in Table. 2,

The results of comparative tests of parts protected by the proposed and known methods are given in

table.3. -.

From the data presented in Tables 1 and 2 it can be seen that the most effective protection of the surface of optical parts from biological fouling is provided by polydimethylmethyl vinyl heterophosphorsiloxanes of the general formula (I) with parameter values n 475-500-, 01, 6, 0-1.6 and mol. mass 3500037000, taken in a certain ratio of NII to tetraethoxysilane. When using polymers with different values of the parameters n, t, and mol. Masses, as well as other ratios of heterophosphorsiloxane and tetraethoxysilane, the effectiveness of the protective action of the coatings decreases.

As can be seen from the table. 3, the proposed method of protection protects the optical 5 parts from biological fouling under conditions of imitation of a humid tropical climate (, humidity 98-tOO%) for 14-16 months, while known protective coatings of the Yu protect optical details. 610 months, and control samples (without coating) are mushroom-resistant only in TG of 12-15 days.

Under natural conditions of humid 15 subtropics, the parts antiseptic with the proposed method are mushroom resistant for more than 4 years, while optical parts with known coatings are mushroom resistant only for 3 years, while the control samples overgrow with mold fungi after 4-12 months

Thus, the application of the proposed method to protect the surface of optical parts from biological fouling improves efficiency and extends the life of the protective optical coating and creates more reliable optical systems of instruments for a tropical climate with a guaranteed storage and operation life of 5 years or more, i

Table 1

table 2

Claims (1)

METHOD FOR PROTECTING THE SURFACE OF OPTICAL DETAILS FROM BIOLOGICAL SPECIES, including surface treatment with a vinyl-containing organosilicon compound, heat treatment and subsequent processing of the resulting coating with a 0.2-0.4% aqueous mercury acetate solution, characterized in that, in order to increase efficiency and increase. -service life of the protective coating, as a vinyl-containing organosilicon compound, a mixture of a 0.2-0.4% solution of polydimethylmethylvinyl heterophosphorsiloxane in the general formula CH ₃ 0 CH ₃ “n M N (N ⁿ sn ₃ he sn = sn ₂ where n = 475-500; t = 1.0-1.6; 1 = 1.0-1.6-, molecular weight 35000-37000 and 60% solution of tetraethoxysilane in ethanol with a volume ratio of solutions (18-20): 1, and heat treatment is carried out at 195-200 ° C. SU, 1165685