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:


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


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