Insulating bitumen-polymer sealant and method of its manufacture

 

(57) Abstract:

Mastic is designed for corrosion protective coatings for underground pipelines. The paste includes a mixture of bitumen, thermoplastic elastomer, plasticizer and filler, the bitumen used a mixture of bitumen BND-60/90 and BNI-4 or bn-70/30, as thermoplastic elastomer used definiltely thermoplastic elastomer, and the composition of the mastic added modifier, a petroleum resin and adhesive additive, and the paste has the following composition, wt.%: bitumen BND-60/90 8,5-90, bitumen BNI-4 1-20 or bitumen bn-70/30 1-90, definiltely thermoplastic elastomer of 1.5-5, plasticizer 1-5, filler 1-8, petroleum resin 2-8, adhesive additive 0.3 to 1.5, modifier 1-6. The method of manufacture of mastics involves mixing bitumen, thermoplastic elastomer, plasticizer and filler, the mixing of components of mastic is done as follows: first, prepare a mixture of road and insulating bitumen or construction bitumen, followed by heating to a temperature of 160-170C dehydrate the mixture, serves a mixture of bitumen in the mixer and add in the last plasticizer, the resulting mixture is stirred at a temperature of 165-175°C in t, and the resulting mixture was stirred 25-35 min, then continue mixing and add petroleum resin, modifier, adhesive additive and a thermoplastic elastomer. Technical result - increase the reliability of the coating. 1 PL.

The invention relates to materials used for the insulation of pipes and pipe systems, and can be used in the construction and repair of pipelines for various purposes, including underground pipelines, oil pipelines and gas pipelines in the summer and winter periods of time.

Famous mastic to protect against corrosion, containing bitumen, cement, sand and granular material (see U.S. patent 4196922, IPC F 16 L 58/12, 08.04.1980).

From the same patent known method of manufacture of mastics, namely, that mix the bitumen and filler.

This mastic and method of its manufacture you will have the mastic that can be used only in the summer or in conditions where there is no lowering of the temperature below 0C, particularly for the protection of underwater pipelines. Thus, the use of such mastic limited.

Closest to the invention to the technical essence and the achieved result is bitumen-polonism., application UK 1538267, IPC F 16 L 58/12,17.01.1979).

From the same application UK 1538267 known method of manufacture of mastics, including blending components that make up the mastic.

However, this resin has poor adhesion to the steel material from which most often produce various kinds of pipelines. In addition, the mastic does not provide the required reliability to protect the pipeline from corrosion in conditions of high temperature, also at negative ambient temperatures. As for the method of manufacture of mastics, it is rather time-consuming.

Task to be solved by the present invention is directed, is to improve the quality of anti-corrosion protection of underground pipelines and increased trouble-free service life of underground gas pipelines.

This problem is solved due to the fact that part of the device as an object of the invention insulating bitumen-polymer resin for corrosion protective coatings for underground pipelines includes a mixture of bitumen, thermoplastic elastomer, plasticizer and filler, the bitumen used a mixture of bitumen BND-60/90 is astika added the modifier, petroleum resin and adhesive additive, and the paste has the following composition, wt.%: bitumen BND-60/90 8,5-90, bitumen BNI-4 1-20 or bitumen bn-70/30 1-90, definiltely thermoplastic elastomer of 1.5-5, plasticizer 1-5, filler 1-8, petroleum resin 2-8, the adhesion additive of 0.3 - 1.5 and modifier 1-6.

In part of the way as the object of the invention, this task is solved by a method for manufacturing bitumen-polymer mastic involves mixing bitumen, thermoplastic elastomer, plasticizer and filler, the mixing of the components of the mastic is done as follows: first, prepare a mixture of road and insulating bitumen or construction bitumen, followed by heating to a temperature of 160-170°To dehydrate the mixture, serves a mixture of bitumen in the mixer and add in the last plasticizer, the resulting mixture is stirred at a temperature of 165-175°C for 2.5 to 3.5 hours until complete dissolution of the plasticizer, next, add a filler such as rubber crumb, and the resulting mixture was stirred 25-35 minutes, then continue mixing and add petroleum resin, modifier, adhesive additive and a thermoplastic elastomer.

As shown by IP is utilized for the formation of coatings bituminous mastics enhanced adhesion to steel and polymeric materials in the temperature range from + 40°C to minus 20°C and retains the ability to withstand mechanical shear, drums and other effects (deformation) at low temperatures (down to minus 20°C).

The application of the proposed insulation mastic reduces the likelihood of emergency situations on the pipelines that result in environmental degradation in their area strip.

As bitumen is used viscous bitumen road BND-60/90 according to GOST 22245-90, bitumen construction bn-70/30 according to GOST 6617-76, bitumen insulation BNI-4 according to GOST 9812-74.

As divinylacetylene thermoplastic elastomer used RBE R-01 group 1 on THE 38.40327-98, MEAs. No. 1.

As a modifier rubber pfbr THE 38103641-98.

The filler used crushed rubber crumb RD-05 TU 38-108-03597, and the plasticizer is an industrial oil I-40A according to GOST 20799-88.

As a strength additive is applied petroleum resin paint on THE 38.10916-79.

As adhesive additives used surfactant-based low molecular weight polybutadiene malaysiaand.

When conducting research based coating insulating bitumen-polymer mastic was applied mechanically or manually by irrigation rasplavlennyi 1:2 by weight) of the surface of the pipe (pipeline). To achieve the desired thickness of the mastic layer armirovali or glass fiber or non-woven polymeric fabric. On top of the reinforced layer of mastic was applied spirally wrapping a layer of polymer tape, for example, polyvinylchloride (PVC) or polyethylene (PE).

To increase friction components of mastic between a mastic type petroleum resin. Additive resin makes it possible to improve the strength characteristics of mastic (resistance to impact, shear and indentation).

As can be seen from the table, the floor of the proposed bitumen-polymer mastic has a higher adhesion to steel and polymer adhesive tapes. In addition, the coating obtained by applying the inventive bitumen-polymer putty for steel pipe for bituminous primer has a higher strength compared with the known insulating bitumen-polymer dispersion, the strength of the coating when struck at a temperature of minus 15°C is 2.0 j.

As studies have shown, the application of the proposed putty allows you to achieve adhesion to steel more than 0.6 MPa at 20°C and store it at temperatures down to minus 15°C on the level not lower than 0.2 MPa. The benefit is mperature ambient air, formed from the coating has high mechanical strength, does not crack and does not splinter when laying pipe in the ground in the winter time.

We offer insulating mastic obtained as follows.

In particular the above proportions prepare a mixture of road and insulation or construction bitumen and by heating to a temperature of 160-170°To dehydrate the mixture.

The mixture of bitumen is fed into the mixer, in which the plasticizer is added, and all this is mixed at a temperature of 165-175°C, preferably 170°C for 2.5-3.5 hours, preferably 3 hours, until complete dissolution of the plasticizer.

The next step in stir mixture is added to the filler-rubber crumb, and mixing continues for about 0.5 hours

In the last stage stir the mixture add the remaining components, i.e., a petroleum resin paint, modifier - liquid rubber, adhesive additive is a low molecular weight polybutadiene malaysiaand and TPR - definiltely TPR.

Total cooking time is 4.5 - 5 hours

In the course of study, the C which were formed of the coating on the pipes. The content of the components in the examples are indicated in wt.%.

Example 1. Bitumen BND 60/90 72%, bitumen BNI-4 10%, definiltely thermoplastic elastomer of 4.0%, the plasticizer is 2.0%, the filler of 6.0%, petroleum resin is 2.0%, the adhesion additive of 1.0%, the modifier of 3.0%.

Example 2. Bitumen BND 60/90 10%, bitumen bn 70/30 78.5 per cent, definiltely thermoplastic elastomer of 2.5%, the plasticizer is 2.0%, the filler 1%, petroleum resin is 3.0%, the adhesion additive of 1.0%, the modifier of 2.0%.

Described in the invention bitumen-polymer mastic has a universal character in part of its application for the formation of the insulating coating directly on the pipe (or pipe), and to create semi-finished products (billets for coating), in particular, for the manufacture of polymer-bitumen tape materials.

1. Insulating bitumen-polymer resin for corrosion protective coatings for underground pipelines, including a mix of bitumen, thermoplastic elastomer, a plasticizer and a filler, characterized in that the bitumen used a mixture of bitumen BND-60/90 and BNI-4 or bn to 70/30, as thermoplastic elastomer used definiltely of Termoli, when this paste has the following composition, wt.%: bitumen BND-60/90 8,5-90, bitumen BNI-4 1-20 or bitumen bn-70/30 1-90, definiltely thermoplastic elastomer of 1.5-5, plasticizer 1-5, filler 1-8, petroleum resin 2-8, adhesive additive 0,3 -1,5, modifier 1-6.

2. The method of manufacture of mastic under item 1, comprising mixing bitumen, thermoplastic elastomer, plasticizer and filler, characterized in that the components are mixed mastic is produced as follows: first, prepare a mixture of road and insulating bitumen or construction bitumen, followed by heating to a temperature of 160-170°To dehydrate the mixture, serves a mixture of bitumen in the mixer and add in the last plasticizer, the resulting mixture is stirred at a temperature of 165-175°C for 2.5 to 3.5 hours until complete dissolution of the plasticizer, then add filler, such as rubber crumb, and the resulting mixture was stirred 25-35 minutes, then continue mixing and add petroleum resin, modifier, adhesive additive and a thermoplastic elastomer.



 

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SUBSTANCE: claimed emulsion contains (mass %) mineral material 83.5-87.5 and cation bitumen emulsion 11.5-14.5. Mineral material additionally contains cement 1.0-2.0; cation bitumen emulsion contains (mass %) bitumen 60/90 59.0-65.0; cation emulsifier 0.7-0.9; surfactant admixture 0.15-0.25; calcium chloride 0.07-0.13; hydrochloric acid 0.35-0.60; oxyethylated phenolic alcohol 0.65-0.80; and balance: water.

EFFECT: mixture with improved adhesive quality of binder with mineral acidic and basic rocks; improved strength characteristic, increased water resistance coefficient, enhanced emulsion decay time.

1 ex, 4 tbl

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