RU2489466C1 - Sealing compound - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to sealing compounds and may be used in optical instrument making for sealing of instruments operated under high and low temperatures. The compound contains the following components, wt %: ceresin wax - 28.5; pine rosin - 9.5; bee wax - 28.5; petrolatum - 30.0; castor oil - 1.5; biocide based on 2-octyl-3(2H)-isocyazolone - 2.0.

EFFECT: production of a sealing compound, which makes it possible to freely disassemble sealed instruments and equipment not exposed to biodamages, subsidence and cracks.

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Description

The present invention relates to the field of producing a sealing composition based on ceresin and pine rosin, used in optical instrumentation to fill the gaps and seal the joints between glass, steel and non-ferrous metal alloys of devices operated at high and low temperatures. The sealing composition provides the opportunity for free disassembly of sealed devices and equipment for their repair and prevention.

As a prototype, a colorless sealing composition (putty) of YOM was selected. containing, wt.%: ceresin brand 80 30, pine rosin 26, beeswax 32, cannon grease 10, castor oil 2.0 (OST 3-5605-91).

The disadvantages of the prototype are its rigidity and biodegradation by mold fungi when operating devices in high humidity. The penetration of YuOM putty is 26 mm, this is a fairly rigid putty, it cannot be applied with a spatula when sealing the seams of optical products.

The task of the invention is to provide a softer sealant composition that is not susceptible to biodeterioration.

The problem is solved by that. that the sealing composition, including pine rosin, ceresin, beeswax, castor oil, contains petrolatum and a biocide based on 2-octyl-3 (2H) -isociazolone in the following ratio of components. mass%:

ceresin 28.5

pine rosin 9.5

beeswax 28.5

petrolatum 30.0

castor oil 1.5

2-octyl-3 (2H) -isociazolone 2.0 biocide 2.0

The inventive sealing composition differs from the known introduction of new components - petrolatum and a biocide based on 2-octyl-3 (2H) -isociozolone. Tests of the prototypes of the sealing composition for mushroom resistance showed that there were no biodeterioration. The penetration of the developed composition is 35-72 mm. that meets the requirements.

A biocide based on 2-octyl-3 (2H) -isociazolone is a liquid antiseptic. designed as a remedy for mold, algae and blue rot for wood and paints. Tests have shown that it mixes well with organic solvents - alcohols, ketones. When mixed with water forms a white emulsion. It is produced by industry under the brand name "ROSIMA ™ 243". We have not found any information on the use of “ROSIMA ™ 243” as a protection for hydrocarbon putties from biodeterioration by molds.

Ceresin (GOST 2488) - a mixture of solid hydrocarbons. It is used as a component of greases, insulation materials, for impregnation of packaging materials.

Pine rosin (GOST 19113) is used in the production of synthetic rubber, in pulp and paper. rubber and paint industry.

Beeswax (GOST 2P79-2000) is used for the manufacture of artificial waxes, components of polishing pastes, ointments.

Petrolatum grade PS-65 (TU 38.401166-90) - a mixture of light brown paraffins and ceresins, is used to produce ceresin, a component of lubricants, electrical insulation compositions, petroleum jelly.

Castor oil - a fatty vegetable oil obtained from castor oil seeds, is used in industry for the production of soaps, drying oils; high quality lubricant.

The inventive composition and ratio of components allowed to obtain a soft sealant composition that is not subject to biodeterioration.

The applicant has not identified technical solutions having features that match the distinguishing features of the alleged invention. A sealing composition with the claimed combination of essential features in known sources of information is also not found.

The developed sealing composition should have the following properties: dropping point not lower than 70 ° C, penetration at 25 ° C - 35-75 mm, heat resistance not lower than 55 ° C, in conditions of high humidity, the sealing composition should be mushroom resistant. In addition, the sealing composition should not cause shrinkage, cracks, should have good adhesion to glass, ferrous and non-ferrous metals.

Ceresin brand 80, currently produced, is poorly combined with other components that make up the sealing composition. It is replaced by ceresin brand 75.

To reduce the hardness of the sealing composition, the content of gun lubricant was increased. The experiments showed that this leads to a sharp decrease in its operating temperature (below 50 ° C), the appearance of an oil stain on the surface of the sample, which is unacceptable when sealing products. As a result, cannon grease was excluded from the composition and petrolatum was introduced. In addition, the amount of rosin was reduced, the content of ceresin and wax was slightly reduced.

For experimental verification, three samples of the developed sealing composition were prepared. The compositions of the samples, wt.%, Are shown in table 1.

Table 1 Components No. 1 Number 2 Number 3 Prototype (putty 100 M) Ceresin 75 28.0 29.0 30,0 - Ceresin 80 - - - 30,0 Pine Rosin 4.0 10.0 16,0 26.0 Beeswax 25.0 29.0 33.0 32,0 Cannon grease - - - 10.0 Petrolatum 25.0 30,0 35.0 - Castor oil 2.0 2.0 2.0 2.0

The technology for preparing the sealing composition is as follows. The components are loaded into aluminum or enameled dishes in the given proportions: ceresin, pine rosin (first grade), beeswax, PS-65 brand petrolatum, castor oil, cannon grease and heated with constant thorough mixing and at a temperature of no more than 140 ° C for one hours. The hot mixture is filtered through brass wire No. 0125, cooled to a temperature of 70 ° C and poured into molds. Then the prepared samples are checked for compliance with the requirements of the standard. The properties of the sealing compositions, which were identified experimentally, are shown in Table 2. Table 2 shows that samples No. 1 and No. 3 do not stand the tests for heat resistance - at a temperature of 55 ° C but an oily liquid is released on the surface of the samples, and for cold resistance at a temperature minus 40 ° C detachment from the walls of the maze. Sample No. 2 meets the requirements: it is stable in the temperature range from 55 ° C to minus 40 ° C, does not shrink, crack, has good adhesion to glass, metals, and is stable in terms of performance.

table 2 The name of indicators No. 1 Number 2 Number 3 Prototype (per stroke 100 M) Test method Appearance, color yellow soft yellow soft yellow soft colorless solid visually Drop point, ° C, not lower 73 70 71 72 according to GOST 6793 Penetration at 25 ° C, mm, not less 46 45 44 26 according to GOST 11501 Heat resistance, ° C, not lower +55 surface oil stain +55 +55 surface oil stain +55 according to OST 3-5605 Cold resistance, ° C, not higher -40 peeling -40 -40 peeling -40 according to GOST 3-5605 The presence of water-soluble acids and alkalis,% no no no no according to GOST 6307 Corrosion on metals no no no no according to GOST 9.080

Then, the sealing composition corresponding to sample No. 2 was tested for mushroom resistance. Four samples were prepared for experimental verification. The compositions of the samples, wt.%, Are shown in table 3.

Table 3 Components Number 4 Number 5 Number 6 Number 7 Ceresin brand 75 28.5 28.5 28.0 29.0 Pine Rosin 10.0 9.5 9.5 10.0 Beeswax 28.5 28.5 28.0 29.0 Petrolatum 30,0 30,0 30,0 30,0 Castor oil 2.0 1,5 1,0 2.0 2-octyl-3 (2H) -isociazolone-based biocide 1,0 2.0 3.0

The technology for preparing the sealing composition is as follows. The components are loaded into aluminum or enameled dishes in the given proportions: ceresin grade 75, pine rosin (first grade), beeswax, petroleum grade PS-65, castor oil and heated with constant thorough mixing at a temperature of no more than 140 ° C for one hour . The hot mixture is filtered through brass wire No. 125, cooled to a temperature of 80 ° C and the biocide is introduced into it with thorough mixing until it is completely distributed in the bulk of the sealing composition. The finished sealing composition is cooled to a temperature of 70 ° C and poured into molds.

Table 4 Names of indicators Number 4 Number 5 Number 6 Number 7 Test method 1. Appearance, color soft yellow soft yellow soft yellow soft yellow visually 2. Drop point, ° C, not lower 70 70 70 70 according to GOST 6793 3. The depth of penetration of the needle (penetration) at 25 ° C and a load of 100 g. Mm. no less 35-75 35-75 35-75 35-75 according to GOST 11501 4. Heat resistance, ° C not lower 55 55 fifty 55 according to OST 3-5605 5. Cold resistance, ° C, not higher -40 -40 -40 -40 according to OST 3-5605 6. The presence of water-soluble acids and alkalis,% are absent are absent are absent are absent according to GOST 6307 7. Corrosive effect on metals (steel, brass) at a temperature of 25 ° C. within 24 hours no no no no according to GOST 9.080 8. Mushroom resistance, points does not stand up (1 point) withstand (0 points) withstand (0 points) does not stand up (1 point) according to GOST 9.052 GOST 9.048

The properties of the sealing compositions identified experimentally are shown in table 4.

Samples No. 5 and No. 6 are not subject to biodeterioration. Sample No. 4 does not withstand heat resistance tests.

The developed sealing composition - sample No. 5, meets the requirements of the standard and can be used to seal products operated in high humidity. It is not susceptible to biodeterioration, does not shrink and crack, has good adhesion to glass and metal, and is stable in performance.

Claims (1)

A sealing composition comprising pine rosin, ceresin, beeswax, castor oil, characterized in that it further contains petrolatum and a biocide based on 2-octyl-3 (2H) -isociazolone in the following ratio, wt.%:
ceresin 28.5 pine rosin 9.5 beeswax 28.5 petrolatum 30,0 castor oil 1,5 2-octyl-3 (2H) -isociazolone-based biocide 2.0