Organosilicon composition

FIELD: chemistry.

SUBSTANCE: composition consists of 90-96 wt % of a base - mixture of polydimethylsiloxane (40-60 wt %) and polymethylphenylsiloxane (60-40 wt %) liquid with viscosity of 3000-40000 mm2/s at temperature of 20°C and 4-10 wt % thickener - silicon dioxide. The composition has a refraction index of 1.4100-1.4300, penetration value of 160-280 units, and operates in the temperature range from (-70°C) to (+300°C).

EFFECT: improved properties of the composition.

2 tbl, 12 ex

 

The present invention relates to silicone compositions which finds its application in optics, in particular for connections, seals and sealing glass optical elements for various optical devices.

Components of some nodes of the optical systems (lenses, eyepieces, inversion system, achromatic wedges, complex prism, mirror reflectors, filters, Polaroid, grid and so on) are combined together in mono. As a connecting substance use various organosilicon compounds that improve manufacturability of the design and operational characteristics of the optical systems. There are many ways to connect, such as bonding, sintering, optical contact, welding, and soldering. In this connection the substance must meet the following requirements: do not change the optical properties of linked parts, to provide sufficient mechanical, chemical, thermal and light strength of the connection.

As the optical contact between the light source and the photomultiplier used silicone lubricant compositions which provide maximum light transmission in contact, stable in the temperature range of minus 70°C + 200°C, non-toxic, have chemical inertness in respect of the to construction materials, have a low dependence of viscosity on temperature and high adhesion to the contact surfaces. However, the known organosilicon compositions are composed of functional groups that lead to cross-linking of the polymer and the formation of solid compounds.

In an optical instrument known the use of silicone materials. Thus, in the invention, protected As the USSR №713892, IPC SC 5/098, 1.980 for bonding optical elements of the proposed arrangement on the basis of low-molecular siloxane rubber (brand SCTN) with a viscosity range of from 2000 to 10000 mm2/s

The disadvantages of the known compositions can be attributed to the limited viability, the deterioration of the optical properties associated with crosslinking of siloxane chains.

Described polydimethylsiloxane liquid with a viscosity of 20000 mm2/s at 20°C, used as the instrument and the damping fluid, the main disadvantage of which is that it is leaking when you try to use in optical contact (Sobolevsky M.V., Azovskaya O.A., Popelova G.S. Properties and applications of silicone products. M, Chemistry, 1975. P.44).

Known sealing composition for optical devices having good adhesion (Patent KR 20040035573, IPC C08L 83/00, 2004).

However, the known arrangement does not provide the mobility of the bonding working the x surfaces, what is its main drawback.

In 2011, a patented silicone grease (Patent JP 2011084698, IPC C10M 107/50), consisting of dimethylsiloxane fluid and thickeners.

Silicone grease does not provide the required optical characteristics.

In the literature grease its facilities at the Moscow-299, which is a thick sticky ointment gray. Prepare such grease from polymethylsiloxane fluid with high viscosity and silica gel. The lubricant is intended for use in mechanisms panoramios devices photo & cinematographic. (Fuel, lubricants and technical liquids. The range and application: Directory / Iginition etc. Ed. by V.M. Shkolnikov. M. : Publishing center "Techinformi". 1999. With 330-332).

The disadvantage of this lubricant is a low refractive index less 1,4100 and efficiency in a narrow temperature range.

Closest to the proposed composition and accepted by us as a prototype is the sealing paste for prevention and elimination of leaks in valves (Patent RF №2218384, IPC SM 169/06, 10.12.2003, containing as plastic substrates oligoaniline (polymethylsiloxane or polymethylphenylsiloxane) with a viscosity of from 10,000 to 300,000 JV, and also part of the thickeners and fillers mixture of bentonite, precipitated calcium carbonate, white carbon black, PTFE, Aerosil, mica, high and low molecular weight rubbers.

A major shortcoming of the paste is that it is opaque, dark brown color and is stable in the temperature range from -60°C to + 80°C.

The task of the invention is to develop a silicone composition for the connection and sealing of optical elements, with maximum light transmission without changing the optical properties of linked parts, with a refractive index of from 1,4100 to 1,4300 operable in a wide temperature range of minus 70°C plus 300°C, non-toxic, chemically inert to construction materials, and low dependence of viscosity on temperature and high adhesion to the surfaces of contact.

The analysis of patent documents, scientific literature and research as organosilicon compositions for the connection and sealing of optical elements based on the plastic base and thickener proposed composition consisting of a base - mix polydimethylsiloxanes and polymethylphenyl siloxane fluid having a viscosity of 3000 to 40000 mm2/s at 20°C and a thickening agent silicon dioxide, and the composition has a refractive index 1,4100-1,4300 and the value of penetration 160-280 units, and it works in INTA the shaft temperatures of minus 70°C plus 300°C, the following composition, wt.%:

Base (a mixture polydimethylsiloxanes
and polymethylphenylsiloxane fluid)90-96
The thickening agent is silicon dioxide10-4

The basis of the silicone composition is a mixture of polymethylsiloxane fluid (PMS), the General formula: (CH3)3SiO[(CH3)2SiO]nSi(CH3)3with a viscosity of from 1000 to 50000 mm2/s and polymethylphenylsiloxane fluid (pfms), the General formula:

(CH3)3SiO[(CH3)2SiO]k[CH3(C6H5)SiO]mSi(CH3)3,

where k/m=10/1, with a viscosity of from 10,000 to 20,000 mm2/g ratio PMS-60-40%, PFS - 40-60%.

The examples explain the present invention.

Example 1

In a container equipped with a heater, a stirrer and a thermometer, uploading 270 g polydimethylsiloxane fluid (PMS) with a viscosity of 1000 mm2/s and 180 g of polymethylphenyl siloxane fluid (PPMS) with a viscosity of 10000 mm2/s with the contents of the tank mix and get 450 g of a mixture with a viscosity of 3000 mm2/s, which is the basis of the composition (table 1), then add 50 g of the powder dioxide kr is mnia, the mass is heated to a temperature of 40-60°C and stirred for 3-4 hours. Then the resulting mass is cooled to room temperature, discharged and analyzed for quality parameters (table 2).

1. Appearance colorless transparent buttery plastic mass

2. Penetration at 20°C - 160 units

3. The refractive index () at 20°C - 1,4100

4. Frost (freezing temperature), °C - minus 70

5. Thermal stability, % weight loss at 300°C for 2

hours - 0,5

Analogously to example 1 to prepare organosilicon compositions in examples 2-9, the composition of which is given in table 2.

We offer silicone composition obtained in examples 1-9 is not toxic, has the chemical inertness with respect to construction materials, has a low dependence of viscosity on temperature and high adhesion to the surfaces of contact.

High viscosity composition (3000-40000 mm2/s) and small changes in its value with temperature ensures normal operation of optical devices, a smooth ride and precise recording of the moving parts in winter and summer. The value of penetration at 20°C (characteristic of the lubricant composition) in the range from 160 to 280 units. The silicone composition is characterized by high stability over temp the temperature of minus 70 plus 300°C, weight loss at a temperature of 300°C for 2 hours not more than 1% with preservation of the plastic properties of the lubricant. When used as an optical contact to the devices over time, does not lose its optical properties (transparency), the stability values of the refractive index from 1,4100 to 1,4300 and elasticity.

Silicone composition for the connection and sealing of optical elements based on the plastic base and thickener, characterized in that as the plastic bases of the composition comprises a mixture polydimethylsiloxane (PMS) and polymethylphenylsiloxane (pfms) fluid viscosity of from 3000 to 40000 mm2/s temperature 20°C in the ratio of PMS - 60-40%, PFS - 40-60%, as a thickening agent is silicon dioxide, the composition has a refractive index 1,4100-1,4300, the value of penetration 160-280 units, and it works in the temperature range of minus 70°C plus 300°C, With the following content, wt.%:

The basis is a mixture of polydimethylsiloxane and
polymethylphenylsiloxane fluid90-96
Silicon dioxide10-4



 

Same patents:

FIELD: physics.

SUBSTANCE: radiation diffracting film has a viewing surface and an ordered periodic array of particles embedded in the material of the array. The array of particles has a crystalline structure, having (i) a plurality of first crystal planes of said particles that diffract infrared radiation, where said first crystal planes are parallel to said viewing plane; and (ii) a plurality of second crystal planes of said particles that diffract visible radiation. When the film is turned about an axis perpendicular to the viewing surface and at a constant viewing angle of said film, visible radiation with the same wavelength is reflected from the second crystal planes with intervals equal to about 60°.

EFFECT: designing a film for authenticating or identifying an object.

23 cl, 5 dwg

FIELD: physics.

SUBSTANCE: optical film has a moth-eye relief structure, having multiple protrusions which include multiple slanting protrusions that are inclined relative the primary surface of the film in essentially the same direction when viewing the primary surface of the film from above. The slanting protrusions lie on the periphery of the optical film and are inclined into the film when viewing the primary surface of the optical film from above. The method of making the film includes a step of applying a physical force to the moth-eye structure so as to slant said multiple protrusions. Said step includes a polishing sub-step which involves polishing the moth-eye structure in a predetermined direction.

EFFECT: providing directivity of optical properties of the optical film.

19 cl, 26 dwg

FIELD: physics.

SUBSTANCE: method according to the invention includes the following steps: providing a mould for making a soft contact lens, the mould having a first mould half which forms a first moulding surface, which forms the front surface of the contact lens, and a second mould half which forms a second moulding surface, which forms the rear surface of the contact lens, said first and second mould halves configured to be connected to each other such that a cavity forms between said first and second moulding surfaces; feeding a mixture of monomers of lens forming materials into the cavity, where said mixture of monomers includes at least one hydrophilic amide-type vinyl monomer, at least one siloxane-containing (meth)acryalide monomer, at least one polysiloxane vinyl monomer or macromer and about 0.05 to about 1.5 wt % photoinitiator, where the lens forming material is characterised by the capacity to be cured by UV radiation having intensity of about 4.1 mW/cm2, in about 100 s; and irradiating the lens forming material in the mould for 120 s or less with spatially confined actinic radiation in order to cross-link the lens forming material to form a silicone hydrogel contact lens, where the contact lens made has a front surface, formed by the first moulding surface, opposite the rear surface formed by the second moulding surface, and a lens edge formed in accordance with spatial confinement of the actinic radiation.

EFFECT: making silicon hydrogel contact lenses whose edges are defined not by touching moulding surfaces, but by spatial confinement of radiation, which enables to reuse the mould to make high-quality contact lenses with good reproducibility.

18 cl

FIELD: physics.

SUBSTANCE: method involves local laser deposition of a layer of transparent or opaque material on the surface. Laser deposition is carried out on mirror reflecting adjacent surfaces or coatings of plates already mounted in an interferometer in the gap between surfaces. The gap is filled with a medium which forms a film upon laser irradiation, and the surface is locally irradiated with laser radiation. Thickness of the deposited layer of material can be controlled during deposition by interference measurement of deviation of the length of the optical path of the light beam between the mirror reflecting surfaces of the interferometer plates from the resonance length for the interferometer. The laser beam can scan the surface, wherein its intensity can be modulated with the length of the optical path between the mirror reflecting surfaces.

EFFECT: correcting the shape of surfaces of optical components already mounted in an optical device.

3 cl, 1 dwg

FIELD: physics.

SUBSTANCE: laser radiation focused on the surface of a photosensitive layer is modified on depth in proportion to the power density of the radiation propagating in the photosensitive layer. Before entering a focusing lens, the laser radiation is collimated into a parallel beam whose diameter is smaller than the entrance aperture of said lens and is shifted in parallel to the optical axis by a value where one of the edges of the longitudinal section of the exposing radiation cone in the photoresist layer becomes parallel to the optical axis of the focusing lens. In the second version, an immersion liquid is further placed in the interval between the output lens of the focusing lens and the surface of the photosensitive layer.

EFFECT: high diffraction efficiency of kinoform lenses by reducing loss on counter slopes of zones by increasing the gradient of the slopes formed directly during direct laser writing.

2 cl, 4 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: method according to the invention involves adding to a reaction mixture an effective amount of a compound which reduces protein absorption, hardening said mixture in a mould to form a contact lens and removing the lens from the mould with at least one aqueous solution.

EFFECT: making silicone-hydrogel contact lenses with low protein adsorption, which are comfortable and safe to use, and do not require high production expenses.

23 cl

Optical monocrystal // 2495459

FIELD: physics.

SUBSTANCE: monocrystals are designed for infrared equipment and for making, by extrusion, single- and multi-mode infrared light guides for the spectral range from 2 mcm to 50 mcm, wherein a nanocrystalline structure of infrared light guides with grain size from 30 nm to 100 nm is formed, which determines their functional properties. The monocrystal is made from silver bromide and a solid solution of a bromide and iodide of univalent thallium (TIBr0.46I0.54), with the following ratio of components in wt %: silver bromide 99.5-65.0; solid solution TIBr0.46I0.54 0.5-35.0.

EFFECT: reproducibility and predictability of properties, avoiding cleavage effect, resistance to radioactive, ultraviolet, visible and infrared radiation.

FIELD: measurement equipment.

SUBSTANCE: method involves shaping of a reflector based on organic plastic material and non-organic substance with reflection coefficient of not less than 0.9 by preparing a mixture of initial components under pressure. As organic plastic material there used is a mixture of fluorine and polycarbonate; as non-organic substance - titanium dioxide, at the following component ratio, wt %: polycarbonate 100; fluorine 3.5-5.0; titanium dioxide 0.5-1.0. Forming can be performed by pressing at pressure of 800 to 1500 atm and at temperature of 240-270°C to thickness of not less than 2 mm or by casting at pressure of 750 to 1500 atm and at temperature of 280-290°C to thickness of at least 2 mm. Polycarbonate with melt flow-behaviour index of 2-60 g/10 min can be used as polymer material.

EFFECT: enlarging processing methods, temperature interval of processing, reducing cost and material consumption.

4 cl, 1 dwg

FIELD: physics.

SUBSTANCE: antireflection film has on its surface a moth eye structure which includes a plurality of convex portions, wherein the width between the peaks of adjacent convex portions does not exceed the wavelength of visible light. The moth eye structure includes a sticky structure formed by connecting top ends of the convex portions to each other and the diameter of the sticky structure is smaller than 0.3 mcm. The aspect ratio of each of the plurality of convex portions is less than 1.0, and the height of each of the plurality of convex portions is shorter than 200 nm.

EFFECT: reduced light scattering.

29 cl, 69 dwg

FIELD: chemistry.

SUBSTANCE: germanium monocrystals are grown in crystallographic direction [111] after holding at melting point for 1-2 hours, with temperature gradient at the crystallisation front in the range of (10.0÷18.0) K/cm, which provides dislocation density on the level of (2·104-5·105) per cm2.

EFFECT: invention enables to obtain germanium monocrystals with considerable increase in signal reception area due to directed introduction of a given concentration of dislocations into the grown crystal and conversion of said dislocations from standard crystal defects to active elements of infrared optical devices.

3 dwg, 1 tbl

Grease lubricant // 2493242

FIELD: machine building.

SUBSTANCE: invention refers to grease lubricant containing synthetic oil or mixture of synthetic oils with kinematic viscosity at 40°C of 5 to 700 mm2/s, which are thickened with non-organic thickener and in addition containing a filler to improve hest resistance, a polar reagent and a polymer at the following component ratio, wt %: non-organic thickener 5.0-30.0; filler to improve heat resistance 0.5-12.0; polymer 0.5-10.0; polar reagent 0.5-5.0; synthetic oil or mixture of synthetic oils is the rest.

EFFECT: rise of lubricant drop temperature, improvement of colloidal stability, water resistance and adhesive properties.

6 cl, 7 ex

Grease // 2009183
The invention relates to plastic lubricant used for lubrication of heavily loaded friction units of different mechanisms operating in a wide temperature range, in contact with water, outdoors

FIELD: machine building.

SUBSTANCE: plain thrust bearing from synthetic resin has upper housing (100) from synthetic resin, lower housing (200) from synthetic resin and assembly (300) of thrust bearing from synthetic resin, which is placed between housings (100) and (200). At boundaries of a sliding strip between upper surface of lower annular plate-like section (202) of housing (200), which restricts the lower surface of lower annular groove (204) and lower surface of upper annular plate-like section (102) of housing (100) on one side, and upper surface and lower surface of assembly (300) on the other side, which come into sliding contact with upper and lower surfaces, there is silicon grease based on silicon oil and having kinematic viscosity coefficient at 25°C of not less than 0.0001 m2/s and not more than 0.5 m2/s and containing a thickener to maintain working penetration of not less than 200 and not more than 400. The above silicon oil is silicon oil that contains an additive or modified silicon oil.

EFFECT: creation of plain thrust bearing that is capable of preserving low friction coefficient and preventing microslipping phenomenon at sliding during a long period of time, which allows preventing abnormal friction noise referred to microslipping phenomenon.

12 cl, 9 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to composition of a silicone lubricant used in the medical industry, particularly for making disposable injection needles. The silicone compound for lubricating an injection needle contains heat-resistant low-molecular rubber SKTN class D or E with viscosity 18000-120000 mPa·s, an organosilicon compound - an AGM-9 product based on aminopropyl triethoxysilane and aminoisopropyl triethoxysilaen and toluene as a solvent, with the ratio of SKTN to the AGM-9 product equal to 89-99.5:0.5-11 pts.wt. Mixing is carried out at 15-35°C.

EFFECT: high stability of values of piercing and sliding forces of the siliconised disposable needle, low power consumption and improved technology of producing silicone.

1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: oil composition contains fluorosiloxane liquid which contains a γ-trifluoropropyl radical (161-44M type) with viscosity of not less than 9.0 mm2/s at 100°C, density 1.090-1.200 g/cm3 and flash point not lower than 280°C, and a bimetallic organosilicon additive Inoxil FK, at defined ratios which ensure a synergetic effect.

EFFECT: oil has high operational properties and has thermo-oxidative stability.

1 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: fluid contains the following in wt %: 27-60 polymethylsiloxane liquid with viscosity between 5 and 200 mm2/s at 20°C and 40-73 of an oil fraction with viscosity of 3-15 mm2/s at 20°C from Troitsk-Anastasievka deposit with boiling point of 165-370°C or a waxy mineral base produced via a hydro-catalytic process.

EFFECT: high reliability and faster operation of automatic systems, good operational characteristics in any climatic zone (from -70 °C to +70°C) and at high operating temperatures (up to 130°C).

2 tbl, 13 ex

Grease // 2374311

FIELD: chemistry.

SUBSTANCE: invention can be used in friction assemblies of machines and mechanisms. The grease contains the following in wt %: synthetic oil 1.8 to 18, {5,7,12,14-tetramethylbenzo [b,i] -1,4,8,11 tetra-aza[14]annulenato} copper (II) of formula: 1.2 to 12, CYATIM-221 lubricant - the rest. The synthetic oil used is based on pentaerythritol ester and fatty acids of the C6-C10 fraction, particularly oil lubricant B-3V.

EFFECT: improved anti-wear and load characteristics.

2 cl, 1 tbl

Grease // 2374310

FIELD: chemistry.

SUBSTANCE: invention can be used in friction assemblies of machines and mechanisms. The grease contains the following in wt %: synthetic oil 2 to 18, 2-hydroxy-1-naphthal-2'-aminothiazole of formula: 1 to 12, CYATIM-221 lubricant - the rest. The synthetic oil used is based on pentaerythritol ester and fatty acids of the C6-C10 fraction, particularly oil lubricant B-3V.

EFFECT: improved anti-wear and load characteristics.

2 cl, 1 tbl

Grease // 2374309

FIELD: chemistry.

SUBSTANCE: invention can be used in friction assemblies of machines and mechanisms. The grease contains the following in wt %: synthetic oil 1.8 to 20, salicylal-2-aminothiazole of formula: 1.2 to 15, CYATIM-221 lubricant - the rest. Synthetic oil used is based on pentaerythritol ester and fatty acids of the C6-C10 fraction, particularly oil lubricant B-3V.

EFFECT: improved anti-wear and load characteristics.

2 cl, 1 tbl

Grease // 2373264

FIELD: chemistry.

SUBSTANCE: grease can be used in machine components and mechanisms, which work in conditions of aggressive media at temperature ranging from minus 30 to plus 250°C. The grease contains, wt %: lithium soap of 12-hydroxy-stearic acid 10 to 18, polytetrafluoroethylene 3 to 5, liquid polysiloxane 18 to 25, diphenylamine 0.1 to 0.5, copper stearate and acetate suspension in castor oil in ratio of 1:1:3-1:2:4 0.2 to 3.1, transformer oil from 30 to 50, industrial oil - the rest.

EFFECT: higher dropping point and values of tearing and sealing loads, as well as reduced thermo-hardening.

1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymeric lubricant having multilayer structure. Polymeric lubricant having multilayer structure is offered. It contains a) siliceous coarse including from 3 to 10 weight parts of inoculating polymeric rubber latex, mixture containing from 6 to 25 wt % of silan having vinylic group, and the rest part is cyclosilokean; b) nuclear containing from 40 to 77 weight parts of polymeric nuclear for coating coarse, the polymeric nuclear contains from 30 to 60 wt % of aromatic vinyl monomer, from 5 to 15 wt % of vinyl comonomer and the rest part - alkyl acrylate derived by emulsion polymerising in the presence of coarses; and c) from 13 to 57 weight parts of polymeric coat for covering polymeric nuclear, note that polymeric coat contains from 1 to 37 wt % of aromatic vinyl monomer, from 1 to 3 wt % of siliceous polymer, from 60 to 98 wt % of methylmethacrylate and the rest part - vinyl comonomer derived by polymerising emulsion in the presence of polymeric nuclear.

EFFECT: development of polymeric lubricant having multilayer structure and high flowability in powdery condition and high ability to prevent adhesion to metal surface during processing.

8 cl, 2 tbl, 5 ex

Up!