Silicone gel composition
(57) Abstract:Silicone gel composition comprises, by weight.h.: polyorganosiloxane with an average in the molecule of the vinyl groups associated with the silicon atom, equal 3-12, (POS-1) 100, polyorganosiloxane (CSOs) 0.5 to 10, polyorganosiloxane with integral trimethylsilylpropyne with an average in the molecule of the vinyl groups associated with the silicon atom, equal 1-2, (POS-2) 20-200, platinum catalyst (in terms of platinum) 7-100 ppm. The composition has improved stability and improved performance in industrial production. 1 C.p. f-crystals, 3 tables. The invention relates to the field of compositions based on liquid silicone rubbers cured by polyaddition reactions, and more specifically to the field of low-modulus compositions, silicone gels.Silicone gels (KG) recently found a wide application in various industries and science, in particular, to protect the various electronic units and components from shock and vibration, as well as to create a dynamic optical models of solids.One of the first publications devoted primeneniyu.).Most fully in theory, the properties of the gels were investigated P. De amounts of frozen in the book "the Idea of scaling in polymer physics" (1982).The world's leading company for the production of silicon materials produced quite a wide range KG for various purposes. In particular, the firm Tochiba KG produces under the brand name YE 5818 RTV, TSE 3051, Dow Corning brand Sylgard 527, X3-6779, Hipec 6110, the company Shin Etsu - KE 104LTV etc.The closest technical solution chosen for the prototype is a silicone gel composition for protection of electronic components (application 63-35654, Japan, MKI C 08 L 83/05, R.J. chemistry, Ref. 2 T).The composition contains
A) polyorganosiloxane viscosity of 50 to 10000 (300 - 5000) cSt at 25oC with an average in a molecule of H atoms associated with Si, 1, and the remaining organic groups associated with the Si atom, represent a (UN)substituted monovalent hydrocarbon radicals containing no aliphatic unsaturated groups;
B) polyorganosiloxane with the average number of vinyl groups in the molecule associated with Si, 2, and the number of the vinyl groups on the hydrogen atom A associated with Si is 0.1 to 3;
C) a catalyst based on Pt, Pd or Rh, and the content of KATALITIChESKIE protective coating on top of the hybrid structure and large-scale integrated circuits.However, the change in the elastic modulus KG concentration of crosslinking agent - polyorganosiloxane adopted for the prototype composition has a pretty sharp dependence, i.e. small changes in the concentration of crosslinking agent leads to a significant change in the elastic modulus. This, as well as have always a place of technological variation in components of the composition lead to the fact that the modulus of elasticity KG varies from batch to batch. In some industries, for example in dynamic optical models and others, this is unacceptable.The technical object of the present invention is to improve the stability of the compositions and their characteristics in industrial production.The technical result is achieved by the fact that the proposed silicone gel composition includes polyorganosiloxane with integral trimethylsilylpropyne with the average number of vinyl groups in the molecule associated with Si, 3-12 (POS-1), polyorganosiloxane (CSOs) and the platinum catalyst and differs from the known presence of additional polyorganosiloxane with integral trimethylsilylpropyne with the average number of vinyl groups in the molecule associated with Si, 1-is negotiationson (CSOs) - 0,5 - 10
Polyorganosiloxane (PIC-2) - 20 - 200
The platinum catalyst (in terms of platinum) - 7 - 100 ppm.In addition, the composition may contain oligoorganosiloxanes with integral trimethylsilylpropyne in an amount of 5 to 150 wt.h. on 100 wt.h. POS-1
The chemical composition of polyorganosiloxanes may be represented by the General formula
PIC-1 M' M150-670M3-12M',
PIC-2 M' M150-670M1-2M',
where M' - (CH3)3SiO-
M -(CH3)2SiO-; (C6H5)(CH3)SiO-; (CF3CH2CH2)(CH3)SiO-
M" - -(CH3) (CH2-CH) SiO-
The viscosity of the POS 1 and POS 2 is 200 - 6500 SST, the content of unsaturated groups, characterized by a bromine number (b h) - 3.5 to 4.5 and 0.5 to 1.5, respectively.Get them by known methods: anionic or cationic copolymerization of cyclic and/or linear organosiloxanes. The viscosity is regulated by the dosage of lexaorganizer.exe or organosiloxanes with integral triorganosilylalka. As a catalyst for copolymerization use aqueous KOH, CsOH, (CH3)4NOH and their siloxanes, cation exchange resin, an acidic clay. Receiving POS 1 and POS 2 is illustrated by the following examples.
4, dimethylcyclohexane), 15,98 of methylphenylsiloxane (A3), 2,53 g methylvinylsiloxane (4), 1,60 g hexamethyldisiloxane (HMDS), heated under stirring to 60oC, add 2 g of cation exchanger KU-23 and keep stirring at this temperature for 4 hours. Then cation exchange resin is filtered off and distilled unreacted monomers from the resulting polymer at a temperature of 150 - 170oC and a residual pressure of 5 - 25 mm RT. Art.Characteristics obtained in examples 1 to 8 samples are shown in table. 1.Example 2. The process is conducted similarly to example 1, except for copolymerization take 100 g of D4, of 1.94 g of the hydrolyzate of methylphenyldichlorosilane (MSDHS), 1.4 g oligomerisation liquid PMS-1,5.Hydrolysis MVTHS carried out as follows. In chetyrehosnuju flask equipped with stirrer, reflux condenser, dropping funnel and thermometer, download 300 ml of water and from the dropping funnel for 2 hours was added dropwise 141 g (1 mol) MVTHS, maintaining the temperature of the hydrolysis of 15 - 20oC. and Then stirred the reaction mass for another 2 hours. Separating the hydrolysate, washed until neutral, dried over calcium chloride and sodium bicarbonate and use in copolymerization 2, only for copolymerization take 100 g dimethylsiloxane liquid PMS-100, 2.6 g of the hydrolyzate MVTHS and 1.5 g of PMS in 1.5.Example 4. In a three-neck flask is charged with 100 g of D4, 2.4 g4, with 21.4 g of methyl-cryptosporidiosis (F3), 0.75 g PMS-5, is heated with stirring to 140oC and injected into the reaction mixture 0,009 ml of 40% aqueous solution of CsOH, after 1 hour, enter 0,018 ml silentspace containing 10% H3PO4. Distilled unreacted monomers at 140 - 160oC and a residual pressure of 10 - 30 mm RT. Art.Example 5. Analogously to example 4, only take 100 g of PMS-200, 21 g F3, 0.65 g4and 1.4 g PMS-1.5 and copolymerization are 6 hours.Example 6. Analogously to example 1, except that as minilateral component use cohydrolysis clear (DMDS), methylphenyldichlorosilane (MSDHS) and trimethylchlorosilane (TMCS) in a molar ratio of 9 : 3 : 2.Corydalis are as follows. In chetyrehosnuju flask equipped with stirrer, thermometer, reflux condenser and addition funnel, pour 320 ml of water. From the dropping funnel was added dropwise to water for 2 hours a mixture of 116 g DMDS, 42,3 g MVTHS and 21.7 g TMDS. Temperature cohydrolysis not exceeding 30oC. For okongo with sodium bicarbonate solution until neutral, dried over calcium chloride. The resulting cohydrolysis has a bromine number of 44.2.For copolymerization take 100 g of D4, 15.9 g A3, 3,34 g cohydrolysis with bromine number 44.2 and 1.7 g HMDS.Example 7. In a three-neck flask equipped with stirrer, thermometer and reflux condenser, load 100 g depolymerised D4, 1.5 g of cohydrolysis with bromine number 44,2 (see example 6) and 0.6 g of PMS is 1.5. Heat up the contents with stirring to 140oC add 0.005 g of KOH in the form of siloxanes potassium and lead the process for 1 hour, then reduce temperature to 120oC add 0.005 g H3PO4, stirred for 0.5 hours. Then distilled monomers at a temperature of 140 - 170oC and a residual pressure of 5 - 25 mm RT. Art.Example 8. Analogously to example 1, only take 100 g of PMS-1000, 3.0 g of cohydrolysis with bromine number 44,2 (see example 6) DMDS, MSDHS, TMHS. Properties of the obtained oligomers, the viscosity and the bromine number is shown in table 1.As cross-linking component is used polyorganosiloxane with hydrogen (HSi= 0,42 of 1.8%, with a viscosity of 10 to 130 cSt/20oC the General formula
where M' - (CH3)3SiO-;
M"' - (CH3)2SiO-;
M"" - C
where E1E2,1,2the young's moduli and Poisson's ratio of the indenter and the If E1> E2the modulus of elasticity of the material under investigation can be calculated by the depth of penetration of the indenter:
.In examples 6 used oligomethylsiloxanes brand 133-79, 8 oligomer--cryptosporidiosis brand 161-44, 7 and 10 oligomethylsilicones with PMS 200 PMS-1000, respectively.In the composition of the used catalysts, which represents a complex platinum compounds in which the ligands are organosilicon compounds of General formula
where n = 0 to 2,
(US 3775452 A, 1973), and platinum on various media, etc.Examples 11 and 12 made according to the prototype. It is seen that by increasing the concentration of crosslinking agent 2 times the modulus of elasticity is growing more than four times, while the same change in the concentration of crosslinking agent in examples 1 and 9, is performed according to the proposed formula, the modulus of elasticity increased less than 1.5 times.Thus, the proposed arrangement provides a more gradual change in the elastic modulus of the composition change of concentration of crosslinking agent. 1. Silicone gel composition in inilah groups, associated with the silicon atom is 3 - 12 (POS-1), polyorganosiloxane (CSOs) and the platinum catalyst, characterized in that it further comprises polyorganosiloxane with integral trimethylsilylpropyne with an average in the molecule of the vinyl groups associated with the silicon atom, is equal to 1 - 2 (PIC-2), in the following ratio, wt.h.:
Polyorganosiloxane (POS-1) - 100
Polyorganosiloxane (PSO) is 0.5 - 10
Polyorganosiloxane (PIC-2) - 20 - 200
The platinum catalyst (in terms of platinum) - 7 - 100 ppm
2. Silicone gel composition on p. 1. characterized in that it further comprises oligoorganosiloxanes with integral trimethylsilylpropyne in an amount of 5 to 150 wt.h. on 100 wt.h. polyorganosiloxane (PIC-1).
FIELD: hermetic based on law molecular siloxane rubber, in particular sealing composition.
SUBSTANCE: invention relates to sealing composition vulcanized by reaction with air moisture. Claimed rubber-based composition comprising zinc oxide, ethyl silicate, and diethylaminomethyltriethoxysilane, contains additionally pulverized grinded quartz. As a variant hermetic also contains chalk and/or dolomite. Composition of present invention is useful in sealing of various conjunctions operating in wide temperature limits where oil and gasoline resistance is required.
EFFECT: hermetic with low-cost components and excellent in operating characteristic.
1 cl, 2 tbl, 7 ex
FIELD: electrical engineering; automobile and ship building, mechanical engineering, construction , oil extraction, and oil refining industries.
SUBSTANCE: proposed electric drive has stranded copper conductor with strand sectional area of 1.0 - 50 mm3 and rubber sheath , 0.4 - 7.0 mm thick, made of rubber mixture whose matrix is polymeric mixture of high-molecular polymethyl vinyl-siloxane and low-molecular polymethyl vinyl-siloxane rubber of mole mass of 20 -70 thousands in combination with silica powder, quartz, anti-texturing agent in the form of αω-dihydroxide methylsiloxane and organic peroxide. Rubber mixture is applied by extrusion at speed of 0.2 - 2 m/s and cured under radiation-chemical curing conditions with aid of cobalt gun incorporating γ-radiation source at dose rate of 2.5 - 20 megarad. and/or by thermal curing. Electrical conductor produced in the process is capable of fire self-suppression and is suited to operate at -60 to +300 °C.
EFFECT: enhanced fire, crack, oil, and gasoline resistance, improved electrical and physical characteristics.
3 cl, 1 tbl
FIELD: organic chemistry, medicine tools.
SUBSTANCE: claimed composition contains siloxane and solvent (toluene and isopropanol). Said siloxane represents product obtained by interaction of liquid organosiloxane resin (80-95 pts mass) with nitrogen-containing compound (5-20 pts mass) of formula wherein R1 is H, CH3, -CH2CH2NH , -(CH2)6NH2; R2 is H or C1-C3-alkyl; n = 1-3. Reaction is carried out at 70-140°C for at least 4 h.
EFFECT: inexpensive silicone composition for disposable injection needle with decreased prick force.
5 ex, 1 tbl
FIELD: foam-sealing agents.
SUBSTANCE: invention describes a heat-resistant foam-sealing agent comprising polyorganosiloxane rubber, zinc oxide, oligohydride siloxane, amino-compound and vulcanization catalyst. Heat-resistant foam-sealing agent comprises polydimethylmethylphenylsiloxanediol as polyorganosiloxane rubber, oligomethylhydride siloxane as oligohydride siloxane, aminosilane as amino-compound and polyorganoelementosilazane resin as a catalyst in the following ratio of components, mas. p. p.: polydimethylmethylphenylsiloxanediol, 100; zinc oxide, 40-80; oligomethylhydride siloxane, 2.5-4.8; aminosilane, 0.1-0.3; polyorganoelementosilazane resin, 1.5-3.5. Invention provides the development of technological foam-sealing agent showing sufficiently long working life for pouring article to be sealed (30 min, not less), without toxicity, possessing internal adhesion to different backings, retaining elasticity at temperatures from -100°C to +300°C and vulcanizing at room temperature.
EFFECT: improved and valuable properties of agent.
5 cl, 2 tbl, 5 ex
FIELD: synthetic rubbers.
SUBSTANCE: invention relates to composition based on fluorosiloxane rubber (100 wt parts), which composition further includes 25-35 wt parts silica filler, 5-10 wt parts polyorganosiloxane liquid, 0.5-0.2 wt parts organic peroxide, and additionally 5-10 wt parts iron oxide, said fluorosiloxane rubber being, in particular, poly(methyl-3,3,3-trifluoropropylmethylvinyl)siloxane rubber having molecular weight 900-1500 and molar portion of methylvinylsiloxane units 0.15-0.25 mol %, and said polyorganosiloxane liquid being diorganodialkoxysilane.
EFFECT: increased oil and fuel resistance of composition, which allows lifetime of technical rubber parts in immovable and restrictedly movable connections in air, fuel, and lube oil media to be considerably increased.
FIELD: polyorganosiloxane applications.
SUBSTANCE: compositions for treating and modifying surfaces contain siloxane polymers with functional side residues including two or more anionic groups, of which at least one being carboxyl group. Surface treated with such composition acquires hydrophobicity owing to deposited siloxane polymer with anionic functionality. The latter imparts a number of advantages to surface such as easiness of cleaning, removal of impurities, removal and prevention of spots, conditioning, and so forth. Moreover, siloxane polymer with anionic functionality acts as carrier when active agents are applied onto surface and improves retention and efficacy of active agents on treated surface.
EFFECT: enlarged assortment of surface-modification substances.
9 cl, 11 ex
FIELD: optical materials.
SUBSTANCE: invention provides composition, whose refractory index can be varied by a simple way and which may manifest sufficiently large refractory index difference and provide stable refractory index configuration and optical material irrespective of conditions of their use and way of refractory index configuration and optical material formation. Composition, in particular, contains: (i) destructible compound, (ii) alcoholate hydrolyzate such as, for example, tetrabutoxytitanium, tetramethoxyzirconium, tetramethoxygermanium, or tetramethoxysilane, or halogen-containing compound such as tetrachlorosilane, and (iii) radiation-sensitive destructor.
EFFECT: achieved preparation of stable refractory index varying optical materials.
12 cl, 2 tbl, 4 ex
FIELD: construction industry; compositions for an elastic coating of the molds at manufacture of the production tools for construction and decorative works.
SUBSTANCE: the invention is pertaining to the field of manufacture of the elastic, in particular, the rubber-silicon technological fittings used in production by small series of geometrically-complex artistically-applied details, in the works at manufacture of the technical-decorative products and restoration works. The composition for manufacture of the elastic coating for molds used for manufacture of the technological fittings contains the high-molecular silicone rubber in amount of 2-35 mass %, the curing agent - up to 0.5 mass % and the organic solvent - the rest. The technical result of the invention is production of the composition ensuring the increase of the operational life of the elastic technological fittings and possibility of the multiple restoration of their form up to the operational state.
EFFECT: the invention allows to produce the composition ensuring the increase of the operational life of the elastic technological fittings and possibility of the multiple restoration of their form up to the operational state.
FIELD: chemical industry, in particular composites useful in production of general mechanical rubber goods, such as cables, electrical conductors, etc.
SUBSTANCE: clamed material is obtained from rubber mixture containing as base blend of low molecular methylvinylsiloxane rubber having molecular mass of 20000-70000 and high molecular methylvinylsiloxane rubber; α,ω-dihydropolydimethylsiloxane as anti-structuring agent; aerosil, pulverized quartz; organic peroxide; waterproofing organosilicone liquid; optionally stearic acid and dehydrating agent; calcium and magnesium, or barium, or aluminum oxides, or zeolite, fire proofing agent, such as hydrated calcium, or magnesium, or aluminum hydroxides; calcium or aluminum carbonates in specific mass ratio.
EFFECT: material with decreased residual compression deformation; increased frost, water, and moisture resistance, low combustibility.
2 tbl, 1 ex
FIELD: chemistry of polymers.
SUBSTANCE: invention describes a polymeric composition based on synthetic low-molecular dimethylsiloxane rubber SKTN of sort A, cold hardening catalyst № 68 that comprises additionally epoxide diane resin ED-20, amine hardening agent AF-2 representing a product of interaction of phenol, formaldehyde and ethylenediamine, organic solvents chosen from mixture of xylene and ethyl alcohol in the ratio = 2:1 in the following ratio of components, mas. p. p.: epoxide diane resin ED-20 (All-Union State Standard, AUSS) 10587-84, 90-110; synthetic low-molecular dimethylsiloxane rubber of sort A, AUSS 13835-73, 90-110; hardening agent AF-2 as a product of interaction of phenol, formaldehyde and ethylenediamine, specify 2494-511-00203521, 9-11; cold hardening catalyst № 68, OST 38.03239-81, 2.5-3.5; organic solvent as a mixture of xylene, AUSS 9410, and ethyl alcohol, AUSS 18300 taken in the ratio = 2:1, 10-20.
EFFECT: valuable properties of composition.
2 tbl, 3 ex