Mastic

FIELD: construction.

SUBSTANCE: invention is related to materials for protection against corrosion of pipeline metal surfaces and electric cables in metal casing, and also to materials for sealing of accumulators. Mastic based on asmol contains oil dissolvent, ASM glue, plasticiser, bivinyl styrene thermoplastic elastomer DST and syndiotactic 1.2 polybutadiene. Mastic may additionally contain chalk.

EFFECT: mastic has high resistance to loads due to increase of its strength characteristics, when mastic is applied onto polymer base, possibility is provided to use tape at low temperatures (up to -20°C).

2 cl, 1 tbl

 

The invention relates to the field of construction and operation of pipelines, oil pipelines and gas pipelines, in particular to materials for corrosion protection of metal surfaces of pipelines.

Known bitumen-polymer mastic, including bitumen, definiltely TPR, industrial oil as plasticizer and rubber as a modifier in the following ratio, wt.%:

Bitumen40-80
Definiltely TPR1-10
The plasticizer1-6
Modifier1-7

[Pat No. 2192578, CL F16L 58/12, publ. 2002].

However, the mastic does not provide reliable protection of the pipeline due to a lack of high adhesion to the metal surface (0.5-0.6 MPa)due to low adhesive ability to the metal of the main component is bitumen.

The authors have developed a resin comprising as a main component - Asmol petroleum derivative polymer having physico-chemical characteristics similar to the bitumen, but with a significantly higher adhesion to metal (1.0 to 1.5 the PA). First Asmol (wax compound in the form of wax oligomer was obtained by reacting asphalt of deasphalting with kubovy the remainder of isoprene production stage regeneration dimethylformaldehyde in the presence of sulfuric acid [U.S. Pat. Of the Russian Federation No. 2074224, CL SC, publ. 1997]. In further to get asmala with qualities similar to the second component was replaced by a heavy tar - VAT residue regeneration of dimethylformamide (KORD) [Nemchenko, Ippadi, Campuseros, YouTube. Asmol and new insulating materials for underground pipelines. - M.: OOO "Nedra-Business centre", 2005, p.108].

Closest to the claimed object is mastic containing wax connection Asmol", mineral oil S-9 as a plasticizer, definiltely Thermoelastoplastic, antioxidant and chalk in the following ratio, wt.%:

Asmol73,0-77,0
Mineral oil S-915,5-17, 0mm
Definiltely TPR3,5-4,0
Antioxidant0,5-1,9
Chalk 1,0-4,0

[RF patent №2138884, CL NM 2/08, SC 3/10, publ. 1999].

This sealant is designed for sealing of batteries and unsuitable for use as the adhesive layer of polymeric adhesive tapes. Mastic has good adhesion to metal and polypropylene, however, the softening temperature by Kish above 100°C makes impossible the implementation of the technological process of manufacture of the tape, as it has low fluidity of the melt mastic. In addition, the high content of chalk in mastic (4%) leads to increased water absorption mastic.

The invention is aimed at improving the quality of mastic to give her a high protective properties and its application as an adhesive layer for polymer adhesive tapes: decrease the softening temperature of the mastic, the increase of adhesion to polyethylene and polyvinyl chloride at low temperatures of application, reduced water absorption, increases durability of the coating to peel at the cathodic polarization and deformation loads.

This is achieved in that the mastic-based asmala containing definiltely TPR DST, oil as plasticizer, according to the invention further comprises a glue AFM, solvent "nefras" and syndiotactic 1,2 polybutadiene, at the same time as oil mastic contains rapeseed oil when next the ratio of components wt.%:

Asmol61,0-94,0
Solvent "nefras"1,0-6,0
Definiltely
thermoplastic elastomer DST0,9-3,0
Syndiotactic
1,2-polybutadiene0,1-2,0
Rapeseed oil1,0-of 17.0
Glue AFM6,0-11,0

Mastic may further comprise chalk in the following ratio, wt.%:

Asmol61,0-94,0
Solvent "nefras"1,0-6,0
Definiltely
thermoplastic elastomer DST0,9-3,0
Syndiotactic
1,2-polybutadiene0,1-2,0
Rapeseed oil1,0-of 17.0
Glue AFM6,0-11,0
Chalk0.3 to 0.5.

Asmol is a solid elastic material black color density of 0.99 1.06 kg/cm and produced at JSC UZEMIK (Ufa) TU 5623-002-05111644-96 "Mastic composition for anti-corrosive coatings "Asmol"".

Solvent "nefras" is produced in the domestic industry in large scale according to GOST 10214-78 "oil Solvent. Technical conditions". For example, it is produced at JSC "Salvatorkirche", JSC "Ufaorgsintez", JSC "LUKOIL-Permnefteorgsintez", etc.

Definiltely TPR DST is a block copolymeres based on styrene and butadiene and is available in JSC "Voronezhsintezkauchuk" beyond 38.40327-98.

Syndiotactic 1,2 polybutadiene is a commercial product and is produced, in particular under the trademark "Herodian" CH-8000 JSC "Efremov synthetic rubber plant".

Rapeseed oil is produced at JSC "Satraps" according to GOST 8988-77 "rapeseed Oil. Technical conditions".

Glue AFM is a solution of a rubber mixture based on butyl rubber and Asmol in gasoline-solvent for the rubber industry. Glue AFM is available product is the first product and is produced at JSC "UZEMIK" (Ufa) TU 2513-032-16802026-2007 "Anticorrosive adhesive composition (Adhesive AFM)".

The preparation of the proposed mastic is as follows.

Download estimated number of rapeseed oil, glue AFM, solvent nefras", divinylacetylene thermoplastic elastomer DST, syndiotactic 1,2-polybutadiene with increasing temperature up to 100-110°C., stirred until complete dissolution of the polymers, then increase the temperature to 125-130°C and add Asmol, followed by stirring to dissolve at a temperature of 130-150°C (for 8-13 hours), then Mel, if necessary.

According to the claimed method were obtained mastic composition which, as well as physico-chemical characteristics are presented in table. For comparison, the composition and properties of mastic, obtained according to the prototype.

As can be seen from the table, the proposed mastic on its physical and mechanical properties superior to the prototype: it has a lower softening temperature according to Kish, a higher adhesion to metal and polymer-based, high resistance to cathodic peeling, low water absorption mastic.

Thus, the use of the proposed mastic will allow for a comparison with mastic prototype to use it as an adhesive layer of polymeric adhesive tapes, ensuring their high protective properties: high adhesion to metal and polymer-based, resistance to UTS is eiveniu when the cathodic polarization and deformation loads, low water absorption, the use of tape at low temperatures (down to minus 20°C).

Composition and comparative performance of the proposed mastic and mastic prototype
IndicatorsExamples
on the proposed masticprototype
1234
Content, wt.%:
- Asmol61,079,078,794,077,0
- Definiltely TPR DST3,02,02,00,94,0
- 1,2-polybutadiene2,02,0 2,00,1-
- Solvent "nefras"6,01,01,03,5-
- Canola oilof 17.010,010,01,0-
Glue ACM11,06,06,0--
- Mel--0,30,53,0
- Mineral oil S-9----15,0
- Antioxidant----1,0
Physico-chemical properties of mastics:
- Softening temperature by Kish, °C75838594102
- Penetration mastic at 25°C, 0.1 mm9072606460
- Adhesion to steel at (20±3)°C, kg/cm2,53,13,23,72,0
- Adhesion to polyethylene and polyvinyl chloride (overlap) at (20±3)°C, kg/cm2,12,52,62,61,5
- Flexible ribbon
No cracks on bending temperature-20°C -10°C0°C0°C
- Water for 24 h, three (20±3)°C, %0,100,100,150,173,0
Area of peeling* when the cathodic polarization after soaking in the electrolyte at (20±3)°C for 30 days, cm2,2,73,23,43,015,2
*The larger the area of exfoliation, the lower protective properties of the coating

1. Mastic based asmala containing definiltely TPR DST, oil as plasticizer, characterized in that it further comprises a glue AFM, solvent "nefras" and syndiotactic 1,2-polybutadiene, at the same time as oil mastic contains rapeseed oil in the following ratio, wt.%:

Asmol61,0-94,0
Solvent "nefras"1,0-6,0
Definiltely
thermoplastic elastomer DST0,9-3,0
Syndiotactic
1,2-polybutadiene0,1-2,0
Rapeseed oil1,0-of 17.0
Glue AFM6,0-11,0

2. Mastic according to claim 1, characterized in that it further comprises chalk in the following ratio, wt.%:

Asmol61,0-94,0
Solvent "nefras"1,0-6,0
Definiltely TPR DST0,9-3,0
Syndiotactic
1,2-polybutadiene0,1-2,0
Rapeseed oil1,0-of 17.0
Glue AFM6,0-11,0
Chalk0,3-0,5



 

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