Heat-resistant foam-sealing agent

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

 

The invention relates to the field of expandable silicone compositions that can be used for electrical insulation and protection of various devices and components, such as contacts in the aircraft, instrumentation and other industries.

Known foaming compositions based on silicone rubber, in which foaming occurs due to separation of the gaseous products of the process reactions between the components of the compositions: for example, carbon dioxide (RF patent No. 2115676) or hydrogen when using organosilsesquioxane containing at least two groups - Si-H in the molecule (U.S. patent No. 5238967, 5356940). As catalysts in the compositions using organic peroxides (ed. mon. The USSR №726139), platinum compounds or tin (U.S. patent No. 5238967, 5356940).

The disadvantage of this solution is low, the processability of the compositions after mixing the components rapidly increasing viscosity, pot life is 2 to 10 min, in the case of platinum and peroxide catalysts vulcanization occurs only at elevated temperatures (80°With up to 220°).

The closest analogue adopted for the prototype, is heat resistant foam rubber, including parts: polydimethylsiloxane rubber SCTN with a molecular weight of 40-80 thousand - 100, ispolnitel - zinc oxide and titanium oxide - 20-40, silicone hydrogenoxalate liquid NGL-94 - 20, polyethylenepolyamine - 1 and the catalyst vulcanization - determinability tin - 1-4 (ed. mon. The USSR №309029).

The disadvantages of the prototype are low viability composition (5-10 min), high toxicity of the catalyst (determinability tin belongs to the 1st class of hazard), and lack of adhesion of the foam to the substrate and its limited to 250°With heat. Foam rubber becomes brittle in the temperature range (-55)-(-60)°C.

The technical object of the present invention is to develop technological progenetica having a sufficiently long pot life to fill a resealable products (not less than 30 minutes), non-toxic, and has its own adhesion to various substrates, elastic at temperatures from - 100 to +300°and vulcanizers at room temperature.

For the technical solution proposed heat-resistant phenogenetic comprising organopolysiloxane rubber, zinc oxide, oligohydramnios, aminosidine and vulcanization catalyst, characterized in that the organopolysiloxane as rubber it contains polymethylphenylsiloxane, as oligohydramnios - oligonucelotides as amino compounds - aminosilane, and as a catalyst - polyorganosiloxane resin in the following ratio of components, parts by weight:

polymethylphenylsiloxane100
zinc oxide40-80
oligonucelotides2,5-4,8
aminosilaneof 0.1-0.3
polyorganosiloxane resin1,5-3,5

As aminosilane phenogenetic contains aminosilane selected from the group including: γ-aminopropyltriethoxysilane or its mixture with β-aminoethoxyethanol, diethylaminoethylmethacrylate or 1-aminohexanoate-6-aminomethylenemalonate.

For the purpose of regulating the viscosity of phenogenetic may further comprise polydimethylsiloxanes in the amount of 1.0 to 20.0 parts by weight, and oligoarticular in the amount of 1.0 to 4.0 parts by weight of

As oligoarticular phenogenetic may contain oligomerisation or oligochitosan.

Proper selection of the amino compounds with optimal process for obtaining progenetica activity amino explains quite a long induction period of the reaction foaming, which will ensure the viability of the songs, and released in the process of the reaction products are autocatalysts process, that leads to the formation of several hours non-sticky foam of the vulcanizates. The set of active groups progenetica allows to obtain a material with self-adhesion to various substrates.

In the present invention was used polymethylphenylsiloxane beyond 38 108129-77.

As aminosilane can be used by various representatives of this class of compounds, but it is most preferable to use γ-amino-propyltriethoxysilane or its mixture with β-aminoethoxyethanol (TU 6-02-724-73), diethylaminoethylmethacrylate (TU 6-02-573-77) or 1-aminohexanoate-6-aminomethylenemalonate (TU 6-02-586-86). As oligohydramnios in the present invention is most preferable to use oligonucelotides (TU 2229-013-40245042-00). As polyorganosiloxane resin is most preferable to use resin on THE 6-02-1003-75 mass nitrogen content of 9-25%, silicon - 15-28% and a titanium - 0,3-5,0%. As viscosity regulators should be used oligoarticular, in which it is preferable to use oligoadenylates (GOST 25149-82) or oligomerisation (TU 2416-54)and polydimethylsiloxane (GOST 13835-73).

Examples of the heat resistant compositions of progenetica are shown in table 1, the comparative properties of razlagaemogo sealant and prototype - in table 2.

Examples of implementation

Example 1.

100 parts by weight of polymethylphenylsiloxane mixed with 80 parts by weight of zinc oxide, and 4.8 parts by weight of oligomerisation, of 0.3 parts by weight of γ-aminopropyl-triethoxysilane and 2.0 parts by weight of polyaluminosilicate resin. The mixture is stirred for 5 minutes and then used to fill prepared (cleaned and degrease solvent) products and the control sample to study the properties of progenetica (density, heat resistance and cold resistance of the vulcanizate). Testing is carried out through three days of exposure of samples at normal temperature.

Phenogenetic examples 2-5 are prepared in a similar manner.

The invention is not limited to these examples.

Presented in table 2 data shows that the proposed composition of the heat-resistant progenetica has significant advantages such as technological indicators - contains no toxic ingredients, has a long pot life of 30 to 90 minutes instead of 5-10 minutes of prototype and operational properties - has its own adhesion to metals and plastics, maintains elasticity in a wide temperature range from -100°C to +300°compared with the prototype, preserving the elasticity in the temperature range from -60°C to +250°C. The application of the proposed imaging the acquisition enables reliable sealing and electrical insulation of different devices, including products used in high (up to +300° (C)and at low temperatures (-100°). Phenogenetic can also be used as vibrostation material in a wide range temperaturesok technological properties, non-toxicity, ease of use, does not require special fasteners sealant to substrates and the use of high temperature for vulcanization, substantially reduce the complexity and power consumption of the process of sealing devices and ensure environmental safety.

Table 1
Name of the componentThe composition according to the examples, parts by weightThe placeholder
12345
Polymethylphenylsiloxane100100100100100-
Zinc oxide806040506040
Oligonucelotides4,83,02,53,23,5-
γ-aminopropylation the silane 0,3--0,2--
Diethylaminoethylmethacrylate--0,3---
The mixture γ-aminopropyltriethoxysilane with β-aminoethoxyethanol-0,1----
1-aminohexanoate-6-aminomethylenemalonate----0,16-
Polyorganosiloxane resin2,02,33,51,51,8-
Polydimethylsiloxane--20121,0-
Oligoadenylate-1,0-4,0--
Oligomerisation--4,0-2,0-
Polydimethylsiloxane rubber-----100
Organosilicon hydride Aksenova liquid NGL-94 -----20
The polyethylenepolyamine-----1,0
Determinability tin-----4,0

Table 2
Name propertiesExamples according to the inventionThe placeholder
12345
Viability, min905030406010
Toxicitynon-toxicnon-toxicnon-toxicnon-toxicnon-toxichazard class 1
Density, g/cm30,70,650,480,500,640,5
Elasticity after exposure for 50 h at 300°retains elasticityretains elasticityretains elasticitymaintain the sludge elasticity retains elasticityfragile
Elasticity after exposure for 1 h at -70°retains elasticityretains elasticityretains elasticityretains elasticityretains elasticitysolid glass-like
Adhesion to aluminum alloy D-16goodgoodgoodgoodgoodno
Adhesion to fiberglass the EDB-10Pgoodgoodgoodgoodgoodno
Temperature vulcanizationroomroomroomroomroomroom

1. Heat resistant phenogenetic comprising organopolysiloxane rubber, zinc oxide, oligohydramnios, aminosidine and vulcanization catalyst, characterized in that the organopolysiloxane as rubber it contains polymethylphenylsiloxane, as oligohydramnios - oligonucelotides, as the amino compounds - aminosilane, and to the operation of the catalyst polyorganosiloxane resin in the following ratio of components, parts by weight:

Polymethylphenylsiloxane100
Zinc oxide40-80
Oligonucelotides2,5-4,8
Aminosilaneof 0.1-0.3
Polyorganosiloxane resin1,5-3,5

2. Heat resistant phenogenetic according to claim 1, characterized in that as aminosilane it contains aminosilane selected from the group including γ-aminopropyltriethoxysilane or its mixture with β-aminoethoxyethanol, diethylaminoethylmethacrylate or 1-aminohexanoate-6-aminomethylenemalonate.

3. Heat resistant phenogenetic according to claim 1, characterized in that it further comprises polydimethylsiloxane in an amount of 1-20 parts by weight of

4. Heat resistant phenogenetic according to claim 1, characterized in that it further comprises oligoarticular in the number of 1-4 parts by weight of

5. Heat resistant phenogenetic according to claim 4, characterized in that as oligoarticular it contains oligomerisation or oligochitosan.



 

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