Composition for sticky materials

 

(57) Abstract:

Usage: sticky materials in electrical engineering, and medicine. The inventive composition comprises, by weight. including : low-molecular polyorganosiloxane with terminal hydroxyl groups (rubber SCTN, SDFN - 50, SCTN 2F - 6) 30 - 70; polyfunctional hydroxyl-containing organosilicon resin (copolymer with SiO2and (CH3)3Si0.5links in their mass ratio of 1 : (0,6 - 1,2), respectively, or a copolymer with SiO2, R3SiO0.5and R1SiO1.5links, where R is methyl, R1- phenyl, in their mass ratio 1 : (0,9 - 0,1) : (0,1 - 0,9) 30 - 70 and the curing catalyst (a mixture of 5 - 75%- aminopropyltriethoxysilane and 95 to 25% of tetraethoxysilane or a product of partial hydrolysis) 8 - 15 100 including a polymeric component. The strength of bonding with the metal at breaking 35 - 300 g/see 2 C. p. F.-ly.

The invention relates to organosilicon compositions of cold hardening and can be used for sticky materials used in various fields, in particular in electrical engineering and medicine.

Known siloxane adhesive composition, which is obtained by mixing polyorgano the asty silicone oil, containing 50% of 4,4-bis- (vinylethylene)benzoyl peroxide. The resulting mixture is placed on a substrate and inserted into shape for adhesion for 10 min at 165aboutWith under a pressure of 20 kg/cm2. Thus obtained vulcanized film, adhesion to steel is 7.4 to 9.5 kg/cm2[1] .

The disadvantage of this composition is that its curing requires the use of high temperatures.

Known organic silicon composition to obtain a sticky adhesive with improved adhesion [2] . The composition comprises the product of cocondensate at 80-150aboutWith a mixture of 100 wt. including polydimethylsiloxane with terminal silanol groups with a viscosity of 1 to 107FTAs; 15-200 wt. including soluble in benzene resinous copolymer having a molar ratio of units of R3SiO0,5: SiO2= 0.5 to 1 and 2-10 wt. including flaming silicon dioxide with a surface of 100 m2/, To obtain a pressure-sensitive composition of siloxane product is dissolved in a solvent, followed by curing with peroxides.

The disadvantages of this composition are also mandatory application of the solvent and the use of elevated temperatures during peroxide Oteri. retinoid polysiloxane end of trimethylsiloxy groups having 2% of the silanol groups and the ratio of CH3SIO, SIS units and SiO2links (0,4-1,2): 1; 25-55 wt. including siloxane rubber, obtained by the reaction of dimethylcyclohexylamine and liquid polysiloxane with terminal HE-groups in the presence of an alkaline catalyst (silanolate potassium): 0.5 to 10 wt. including siloxane cluster compounds of the formula R Si[OSi(OR1)3]2where R is methyl, R1- secondary butyl, resinous silicate-treated hexamethyldisilazane in xylene, isopropanol and the reaction product tetramethylguanidine and 2-ethylhexanoic acid [3] . The adhesive material has a relatively high ratio of resin to polymer. The composition is mixed with 1 wt. including benzoyl peroxide and applied to aluminum or Teflon strips and subsequent vulcanization by heating at 70aboutC for 15 min and then at 150aboutC for 5 minutes Despite the fact that the vulcanizate compositions possess high adhesive characteristics (adhesion at breaking away from aluminum not less than 650 g/cm), but they cannot be obtained at room temperature and in the absence of solvent. Furthermore, the known arrangement has the obvious is more close to the technical nature of the compositions according to the invention is a composition for adhesive tape composition: 100 wt. including a mixture of 40-75% soluble in benzene retinoid copolymer having 90% of aliphatic radicals and the ratio of units of R3SiO0,5: SiO2= (0,6-0,9): 1, and 25-60% of polyorganosiloxane with terminal hydroxyl groups, 0.1 to 5 wt. hours of vulcanization catalyst (organic peroxide), 5-20 wt. including filler (titanium dioxide, aluminum hydrate, zinc oxide, silicon dioxide, calcium carbonate, asbestos). The composition is applied on an aluminum foil, followed by curing by heating to 150aboutC for 5 min [4] .

The disadvantages of the mentioned songs are the necessity of using a hot-curing and the presence of a solvent.

The use of vulcanizing systems that require to obtain adhesive compositions to elevated temperatures (70-150about) restricts the use of this method as on the technology of adhesive compositions, and the nature of the substrate. The solvent has a negative impact on the environment.

The technical task of the invention is to provide silicone compositions which combine the property of stickiness with the ability to vulcanizates at room temperature in the absence of solvent.


Low molecular weight poly-

organosiloxane with the end-

new hydroxyl groups 30-70

Multifunctional hydro

crostarosa silicon-

organic resin 30-70

The curing catalyst 8-15

The invention consists in that at room temperature, conducting the mixture to a homogeneous state linear-dihydroxyphenylethylamine (low-molecular polyorganosiloxane) with hydroxyl-containing polyfunctional organosilicon resin, after which the composition is administered curing catalyst.

As linear-dihydroxyphenylethylamine use of low-molecular dimethylsiloxane, methylphenylsiloxane or diphenylsiloxane rubber content phenyl links from 6 to 50% , for example SCTN with a viscosity of 15-25P (GOST 13835-73), Stepnica dimethylsiloxane rubber SCTN as polyfunctional silicone resin used is a copolymer, consisting of SiO2and (CH3)3SiO0,5links in their mass ratio of 1: (0,6-1,2), respectively, having a dynamic viscosity of 250-P, the content of Oh-groups of 0.2-0.6. % mol. m 1600-2000.

When used in compositions methylphenylsiloxane or diphenylsiloxane rubbers SCMSVN-50 or STNF-6 as a polyfunctional silicone resin used is a copolymer composed of SiO2, R3SiO0,5and R1SIO, SIS1,5units, where R is methyl, R1- phenyl, in their mass ratio 1: (0,9-0,1) : (0,1-0,9) accordingly, having a dynamic viscosity 300-18000 P, the content of Oh-groups - 1,5-2,2, the content of phenyl groups 5-38 wt. % mol. m 1800-2600.

The total content of dihydroxyphenylethylamine and polyfunctional organosilicon resin composition must total 100 wt. h

As the curing catalyst is a mixture containing 5-75 wt. % aminopropyltriethoxysilane produced in industry under the brand name of AGM-9 (TU 6-02-724-77) and 95-25 wt. % of tetraethoxysilane (TU 6-09-5230-85) or a product of partial hydrolysis. As a final use of ethyl silicate-40 (GOST 26371-84) or ethyl silicate-32 (TU 6-02-895-86).

When reducing SOCA curing time.

Increasing the amount of curing catalyst in the composition of more than 15 wt. including inappropriate, as it does not have a significant impact on the achievement of the desired result, in addition, the composition becomes maloizvestnoi that prevents even applying it to the substrate.

With decreasing content of polyfunctional organosilicon resin in the composition is less than 30 wt. including the viscosity of the composition decreases so that it is not measurable. The increase in the content of polyfunctional hydroxyl-containing resin composition of above 70 wt. hours leads to deterioration of physical and mechanical characteristics of the composition, in particular the reduction of the relative elongation, which negatively affects the quality of the adhesive layer.

After mixing the components of the composition is applied using a knife on a substrate, stand in the air for at least an hour and isolate polyethylene or other anti-adhesive material.

The substrate can be used different types of paper, cardboard, fabric, wood, metal, polymer films based on siloxanes, urethanes or carboxylating block copolymers, and others.

The viscosity of the compositions feature is m/min, machine RM-200.

P R I m e R 1. Stirred until complete homogenization of the mixture of 3 g (30 wt. h ) silicone resin containing (CH3)3SiO0,5and SiO2the links in the mass ratio of 0.6: 1, having a dynamic viscosity P, HE = 0,6% , mol. m 1600, with 7 g (70 wt. h ) polydimethylsiloxane rubber SCTN viscosity of 17.8 P m 8 Mac. including catalyst containing 5 wt. % AGM-9 and 95 wt. % of tetraethoxysilane. The mixture is then applied in a thin layer on medical film "Carboxyl-P". The strength of bonding with the metal on shelling 35 g/see

P R I m m e R 2. In the conditions of example 1 prepare and test for adhesion to steel adhesive tape, using as substrate the film "Carboxyl-P coated with a thin layer of the composition of 3 g (30 wt. h ) silicone resin with a viscosity of 800 CPS, containing links SiO2, R3SiO0,5and R1SiO1,5mass ratio of 1: 0,9: 0,1, where R is methyl and R1- phenyl, the content of phenyl groups to 5.3 wt. % , mol. m 1800, the content of hydroxyl groups of 1.3 wt. % and 7 g (70 wt. h ) rubber STNF-6, containing 6 mol. % diphenylene links viscosity 30P and 15 wt. hours of curing catalyst containing 15 wt. % AGM-9 and 85 wt. % ethyl silicate ES-32. Strength due to flaking standing 5 g (50 wt. h ) SKT viscosity of 17.8 P and 5 g (50 wt. h ) silicone resin with a viscosity of 400 P., mol. m 1700, containing links (CH3)3SiO0,5and SiO2mass ratio of 1.2: 1, the content of hydroxyl groups of 0.2 wt. % and 10 wt. hours of curing catalyst containing 10 wt. % AGM-9 and 90 wt. % ES-40. The composition of the thin layer of siloxane film "Sigma". The bond strength to steel-3 when the peeling is 135 g/see

P R I m e R 4. In the conditions of example 1 composition is prepared by mixing to a homogeneous state 7 g (70 wt. h ) silicone resin consisting of units of SiO2, R3SiO0,5and R1SIO, SIS1,5mass ratio of 1: 0,1: 0,9, where R is methyl, R1- phenyl, containing 2.5 wt. % of hydroxyl groups, of 37.6 wt. % phenyl groups having mol. m 2200 and 3 g (30 wt. h ) rubber SCMSVN-50 viscosity 100 P containing 50 mol. % methylphenylene links, and 15 wt. hours of curing catalyst containing 25 wt. % AGM-9 and 75 wt. % ES-40. Adhesive composition applied a thin layer of urethane film. The bond strength sticky siloxane layer with metal (steel 3) when the peeling is 300 g/see

P R I m e R 5. In the conditions of example 1 composition is prepared by mixing until homogeneous SUB>1,5mass ratio of 1: 0,5: 0,5, where R is methyl, R1- phenyl, having a viscosity of 600 CPS, 2.0 wt. % hydroxyl groups and 23.2 wt. % phenyl groups, mol. M. 2000, and 5 g (50 wt. h ) polydimethylsiloxane rubber containing 20 mol. % methylvinylsiloxane units, with a viscosity of 40 CPS and 8 wt. hours of curing catalyst containing 75 wt. % AGM-9 and 25 wt. % ES-40. The composition of the thin layer is applied to the siloxane film "Sigma". The bond strength sticky siloxane layer with steel 3 250 g/see

P R I m e R 6. In the conditions of example 1 composition is prepared by mixing to homogeneous condition 3 g (30 wt. h ) polydimethylsiloxane rubber SCTN with a viscosity of 20 CPS, 7 g (70 wt. h ) silicone resin containing (CH3)3SiO0,5links in a mass ratio of 1: 1 having a viscosity of 1200 CPS, 0.4% OF Oh-groups and mol. M. 2000, and 15 wt. including catalyst containing 75 wt. % ATM-9 and 25 wt. % ES-40. The strength of bonding with the metal sticky siloxane layer deposited on the film "Carbosil-P" is 250 g/see

P R I m e R 7. In the conditions of example 1 composition is prepared by mixing 3 g (30 wt. h ) polydimethylsiloxane rubber SCTN viscosity of 17.8 P, 7 g (70 wt. h ) silicone resin containing the units (CH3) is. hours of curing catalyst, containing 50 wt. % AGM-9 and 50 wt. % ES-32. The strength of bonding with the metal sticky siloxane layer printed on cardboard with a thickness of 500 microns, 200 g/see

P R I m e R 8. In the conditions of example 1 composition is prepared by mixing 5 g (50 wt. h ) polymethylphenylsiloxane rubber containing 20 mol. % phenyl units, with a viscosity of 100 CPS and 5 g (50 wt. h ) silicone resin consisting of SiO2, R3SIO, SIS0,5and R1SiO1,5units, where R is methyl, R1- phenyl, at mass ratio of 1: of 0.7: 0.3, and having a viscosity of 2000 CPS, the content of Oh-groups of 1.5% , mol. m 1800, the content of phenyl groups 15% and 10 wt. hours of curing catalyst, containing 50 wt. % AGM-9 and 50 wt. % ES-40. The strength of bonding with metal (steel 3) sticky siloxane layer deposited on the paper 180 g/see

Thus, as seen from the above examples of the obtained silicone composition that combines the property of stickiness with the ability to vulcanizates at room temperature in the absence of solvent.

According to the results of accelerated aging developed adhesive compositions at elevated temperatures made the prediction about the preservation of their properties stickiness within 6-the, if you wipe the surface composition of ethyl alcohol. This fact is extremely important for the practical use of the adhesive compositions. It is noted that the viscosity of the adhesive composition does not increase with the introduction of the polyfunctional organosilicone resin and physico-mechanical characteristics of the resulting composition does not depend on the viscosity of the applied polyfunctional silicone resin, which is of great importance for the process of application of the composition to the substrate. It should be noted that all materials used in the composition, the ingredients of the polymer component are liquid low molecular weight siloxane products so obtained by mixing with a curing catalyst composition is a low viscosity, and well put on any substrate. The choice of substrates for the composition is extremely wide, so you can use them in various fields of engineering and medicine.

1. COMPOSITION FOR STICKY MATERIALS, including low-molecular polyorganosiloxane with terminal hydroxyl groups, a polyfunctional hydroxyl-containing organosilicon resin and curing catalyst, characterized in that as the curing catalyst she aqueous hydrolysis, taken in the amount of 8 to 15 wt. hours at 100 wt. h polymer component, in the following ratio, wt. h:

Low-molecular polyorganosiloxane with terminal hydroxyl groups of 30 - 70

Polyfunctional hydroxyl-containing organosilicon resin 30 - 70

The specified curing catalyst 8 - 15

2. The composition according to p. 1, characterized in that as a polyfunctional hydroxyl-containing silicone resin contains a copolymer of (CH3)3SiO0,5and SiO2-links in their mass ratio (0,6 - 1,2) : 1 respectively.

3. The composition according to p. 1, characterized in that as a polyfunctional hydroxyl-containing silicone resin contains a copolymer with SiO2, R3SiO0,5and R1SiO1,5-links, where R is methyl, R1- phenyl, in their mass zoonosen 1 : (0,9 - 0,1) : (0,1 - 0,9) respectively.

 

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50 cl, 3 tbl, 74 ex, 11 dwg

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