A method of manufacturing a combined gas cylinder

 

A method of manufacturing a combined gas cylinder includes an overlay on a metal frame sealing layer of raw rubber mixture, the winding power over it a layer of fiberglass and simultaneous vulcanization of the rubber layer and the polymerization of the power shell. When this sealing layer is made from a rubber mixture based on butadiene-nitrile rubber containing a vulcanizing system of 2,5-bis(tert-butylperoxyisopropyl)benzene, triethylene glycol dimethacrylate and N,N'-metaphenylenediamine, in the following ratio, wt.h.: the NBR - 100; 2,5-bis(tert-butylperoxyisopropyl)benzene - 2,5-4,0; N,N'-metaphenylenediamine - 0,8-2,0; triethylene glycol dimethacrylate - 10-15; antioxidant - 0,5-3,0; zinc oxide - 3-5; stearic acid 1-3; carbon - 60-90. The use of the invention allows to provide a high integrity, strength, heat and frost resistance sealing layer. 2 Il., 3 table.

The present invention relates to the manufacture of products made of composite materials, and more particularly to the manufacture of composite high-pressure cylinders for the storage, tra the petrochemical, the automotive industry and other

Known vessels of the internal pressure and the methods for their manufacture of composite fibrous materials (CME), for example, the container of the CME, the body of which has two spherical (or near-spherical shape) metal bottom, ending with a hex fitting with internal thread. The inner and outer surfaces of the bottoms of obezyany, and rubber layers form a common monolithic mustache, rolling (pivokonservniy) in a cylindrical gas-tight rubber sheath. The outer surface of the rubber sheath is separated from the power composite-fiber wall Cabinet shell thin fluoropolymer film. Outer composition-fibrous power wall may be formed of layers of longitudinal-transverse, spiral-helix, combined orientation depending on the adopted method of molding or cash processing equipment (Tsyplakov Acting, Designing products made of composite fibrous materials. L., 1984, S. 134-136).

Known vessel for storing a fluid substance under pressure with shatterproof breaking (French patent 2694066, 1994, IPC F 17 C 13/12, 1/04; R j IMS 71-03-95). The vessel has an internal wall in the VI. The Hoop of durable fibers coated with a thermoplastic or thermocatenulatus binder material, surrounds the inner wall and is on the ring at least one layer located on the circumference of the fibers and at least one layer of longitudinal fibers. The vessel is characterized by the fact that shell has at least one layer of fibers arranged directly or helix angle of winding from the angle of the longitudinal fibers 90o.

The known high-pressure bladder for storage and transport of compressed gases, such as oxygen, under pressure (the international application 94/15140 PCT (WO), 1994, IPC F 17 C 1/16; R j IMS 71-09-95). The outer container contains a heavy-duty cylindrical shell made of composite material, the internal hermetic shell of the gas-tight plastic pipe with a metal flange located between the outer and inner shells. Annular flange on the inner surface has one or more annular grooves of trapezoidal cross-section, and the outer and inner surfaces of the rubber tire, fill trapezoidal grooves.

Known gas cylinder, high pressure gas storage (patent of the USSR 1838714, IPC F 17 oppozicionnogo material, outer strength layer made from a polymer composite material, and the sealing layer, for example, rubber-based.

Also known combined container for the storage and supply of liquid and gaseous environments of high pressure and its manufacturing process (patent 2094696 Russia, IPC F 17 C 1/00, 1/16, publ. 27.10.97) prototype. The container is a glass container containing an inner metal sheath, neckline, power shell made of composite material (fiberglass) having an inner sealing layer of rubber. A method of manufacturing a cylinder includes a winding on internal power shell (frame) of a composite material, with the inner shell, loose at the neck, put a rubber stopper, a layer of raw rubber and wound strength composite material. Then the referenced Assembly all together polimerizuet.

In the above-mentioned analogues and the prototype of the invention specified material"rubber" and "rubber" only in General terms. However, not every rubber and not all tires can provide the necessary tightness (low permeability) sealing layer. Rubber sealing layer should have complex sup>2ATM), high strength mounting to fiberglass (not less than 6.0 MPa) and cohesive strength, heat and frost resistance (elongation at break at a temperature of -60oWith not less than 9%), resistance to explosive decompression in natural gas pressure of 25 MPa and speed of the discharge pressure of 1-2 ATM/min

The aim of the invention is to provide a method of manufacture of the container and the sealing rubber composition layer, to ensure high tightness (low permeability) of this layer and satisfies the above requirements.

This objective is achieved in that in the method of manufacturing a combined gas cylinder containing fiberglass shell, a sealing rubber layer and an inner thin metal frame which includes applying to a metal frame sealing layer of raw rubber mixture, the winding power over it a layer of fiberglass and subsequent simultaneous polymerization fiberglass shell and vulcanization of the rubber layer, the sealing layer is made from a rubber mixture based on butadiene-nitrile rubber in the following ratio, wt.h.: BVA acid 1 - 3 carbon - 60 - 90 part curing system which comprises, by weight.h.: 2,5-Bis(tert-Butylperoxyisopropyl) benzene - 2,5 - 4,0 M,M'-metaphenylenediamine - 0,8 - 2,0
Dimethacrylate, triethylene glycol - 10 - 15
The invention is illustrated by consideration of the drawings and tables, where:
- Fig. 1 shows the design of the gas cylinder;
- Fig.2 - callout end of the gas cylinder;
- table.1 - technological, physical, mechanical, heat-resistant and adhesive characteristics of rubber sealing layer;
- table.2 - low temperature properties of rubber sealing layer;
- table.3 - the results of the test tank at the gas permeability.

Gas cylinder contains an inner thin metal frame 1 in the form of a cylinder having end parts of the metal fittings 2 and 3, and the cylindrical part is punched hole (not shown). On the specified frame is applied in a thin (2-3 mm) sealing layer 4 of rubber compound of the above composition having properties shown in table. 1 and 2.

Fittings 2 and 3 with the rubber layers 5 (Fig.2) made in advance separately, podstegivayut to the frame 1 by a pure metal. Pre-molded and wulkanizatornie uplotnitelnyy-21 as an anti-adhesive means. The sealing layer 4 placed on the metal frame 1 and the rubber elements 5 in two layers with a thickness of 1-1.5 mm each lap. On top of the sealing layer 4 is applied power shell 6 made of fiberglass. Fiberglass shell is applied by winding up to the specified size of the gas tank. After winding fiberglass produce simultaneous polymerization fiberglass shell 6 and the vulcanization of the rubber sealing layer 4.

Samples of an experimental batch of gas cylinders with a capacity of 400 l, calculated on the working gas pressure of 25 MPa, and with a capacity of 350 l working pressure 20 MPa, were produced by the proposed method on the enterprise KOKB "Union" (, Kazan, Russia) with the use of rubber blend made in JSC NIICE (, St. Petersburg), and tested in KOKB "Union" (see tab.3).

According to the results of tests of cylinders made of the proposed method were found to meet the requirements: the coefficient of permeability (0,01310-80,05310-8) cm3cm/cm2ATM does not exceed the allowed value 0,05710-8cm3cm/cm2the 50 kgf/cm2; sealing rubber layer has a high frost resistance (elongation at break at minus 60oWith is 10-25%) and high strength rubber with fiberglass (7,0-9,0 MPa). The cylinders are lightweight and suitable for long-term operation.


Claims

A method of manufacturing a combined gas cylinder containing the inner thin metal frame, the sealing rubber layer and the power envelope of composite material which includes applying to a metal frame sealing layer of raw rubber mixture, the winding power over it a layer of fiberglass and simultaneous vulcanization of the rubber layer and the polymerization of the power of the shell, characterized in that the sealing layer is made from a rubber mixture based on butadiene-nitrile rubber containing a vulcanizing system of 2,5-bis(tert-butylperoxyisopropyl)benzene, triethylene glycol dimethacrylate and N,N'-metaphenylenediamine, in the following ratio, wt.h.:
The NBR - 100
2,5-bis (tert-Butylperoxyisopropyl) benzene - 2,5 - 4,0
N,N'-Metaphenylenediamine - 0,8 - 2,0
Di is -
Carbon - 60 - 90l

 

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