JPS5977186A - Reinforced hose structure with strong flexible coating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reinforced hose structure with a simple coating, in particular:
The present invention relates to a reinforced hose structure suitable for, but not limited to, high pressure applications such as those encountered in rotary well drilling rigs and having a simple jacket.

Relatively large diameter hoses, for example, 5.08 to 10.16 CwL inside diameter, are widely used in well drilling machines to deliver and discharge drilling fluids and mud.

This hose has considerable internal pressure, e.g. 6.45 cm, 2
It must be able to withstand internal pressures of approximately 5,000 to over 20,000 pounds per hole, and as the excavation progresses, it will move downward with the excavation pipe and be pulled up each time to allow for the installation of the plugging excavation pipe. It must also have sufficient flexibility to allow the digging derrick standpipe to be spliced to the crease being constructed. Typical hose structures currently used in such applications and other fields that handle high pressure include a tube constituting the innermost layer in the radial direction made of hospital material, a reinforcing material for this elastic tube, and [7] It has one or more layers of woven fabric.

These reinforcing layers strengthen the tube, especially when the hose is bent with a relatively small radius, and the main reinforcing cable of the hose along the hose wall at the point furthest from the center of the arc of the bend. This prevents the tubes from being forced outwardly between the reinforcing cables if they become separated from each other.

In addition, in most high-pressure hoses, the special coated steel cable has at least one or more layers of elastic woven fabric wrapped around the cable, and there is sufficient adhesion between the hose coating and the main body. Tie gum
). Generally, the covering layer also includes a woven fabric.

The present invention provides a reinforced hose structure that is significantly simplified compared to known hose structures, particularly with respect to the coating layer, which is able to meet the demanding demands of rotary excavation operations. It is something to do.

That is, the present invention provides a reinforced hose structure comprising, from the inside to the outside, a tube of elastic material; A reinforced hose structure comprising: an inner reinforcing member and an outer reinforcing member wound in two layers; and (C) a coating blended with carboxylated acrylonitrile-butadiene rubber that forms the outermost surface in the radial direction of the hose. be.

The hose structure of the present invention is shown in the accompanying FIG. 1.

FIG. 1 is a sectional view of a hose structure according to the present invention including a woven fabric layer that can be omitted as appropriate.

Referring first to FIG. 1, there is shown a preferred embodiment of a hose structure 10 according to the present invention. From the inside of the hose to the outside, in the immediate vicinity of the longitudinal axis 11 of the hose, there are physical properties that are necessary for use under more severe, i.e. special working conditions and will be explained in more detail below. A tube 12 of elastic material is provided.

Immediately radially outside the tube 12 there are at least two layers 1 (S), each consisting of a steel cable 15.
, 18 are provided. These cable layers 1611.
8 is embedded in the elastic material 14. These two layers 1
6,18 spirally wound steel cables 15
The outside of the holder is provided with one or more layers of rubberized woven material 20. This layer 20 of rubberized woven material is not essential to the invention and may be omitted. On the outside of this layer 20 of rubberized woven material is a special coating 22 comprised of carboxylated acrylonitrile-butadiene rubber which forms the radially outermost surface of the hose.

Rotary drilling hoses are typically exposed to high pressure, abrasive mud, air, water, and hydrocarbon fluids that occur during edge reversing.

These conditions of use must be taken into account when selecting the elastic material from which tube 12 is formed. Depending on the nature of the fluid injected or expelled through the hose and the chemical resistance required by the body, the tubes are made of acrylonitrile-isoprene copolymer, styrene-butadiene copolymer, etc. Although other elastomers including polymers, polyisoprenes, polychloroprenes, and blends thereof may also be used, acrylonitrile-butadiene rubber based elastomers are particularly suitable for purposes of the present invention.

The elastic material forming the tube 12 meets ASTM Test Method D.
- A tensile stress of at least 60 D psi at 20% elongation as measured according to ASTM Test Method D-412, an elongation at break of at least 150% as measured according to ASTM Test Method D-412, and an elongation at break of at least 150% as measured according to ASTM Test Method D-1053. Preferably, they have a Young's modulus of at least 2000 psi as measured and at least about 1000 psi at a factor of 20 elongation as measured in accordance with ASTM Test Method 1)-412.
tensile υ stress of at least 200% as measured according to AsTM Test Method D-412 and an elongation at break of at least 35% as determined according to AsTM Test Method 1')-1053.
More preferred are those having a Young's modulus of 0.00 psi.

For hoses suitable for high pressure rotary excavators, tube 12
The thickness of the hose should be at least 4.76 mm, measured along the radial direction of the hose from the longitudinal axis 11 of the hose.

The above-mentioned physical properties necessary for the elastic material of the tube 12 can be obtained by combining an elastic material selected from the above group with a reactive resin thread that can be polymerized when blended with the elastic material. These resin systems will be explained in more detail below.

As can be used in the field of rotary excavation, an elastomeric formulation having the following general composition exhibits the physical properties necessary to form the tube 12 of the hose according to the invention.

(b) The content of acrylonitrile is at least 20
Elastic material 2 selected from the group consisting of 75 to 100 parts by weight of acrylonitrile-diene copolymer or acrylonitrile-isoprene copolymer and styrene-butadiene copolymer, polychloroprene and polyisoprene.
5 to 0 parts by weight; and 100 parts by weight of total elastic material, (b) length about 1
~3 1 m and a length to diameter ratio of about 100 to 200, for example, “Santoweb K” available from Monsando
about 10 to 50 parts by weight, preferably about 25 to 35 parts by weight; e→ polymerizable with hexamethylenetetramine, e.g. about 10 to 50 parts by weight, more preferably about 20 to 60 parts by weight of a reactive phenol formaldehyde resin, such as the available Duelenz 12686J resin; and about 0.5 to 50 parts by weight of hexamethylenetetramine;
More preferably about 16 to 2.4 parts by weight; (e.g. A
Reinforcing fillers, such as carbon black and/or hydrated polymers as specified in STM test method N-330, from about 25 to 100 parts by weight, more preferably from about 40 to 75 parts by weight; e.g. 2,2,4-trimethyl-1
, 2-dihydroquinoline, about 0.5
~20 parts by weight; - (g) Zinc oxide, approximately 6 to 10 parts by weight; (Castearic acid, approximately 0.5 to 2.0 parts by weight) Rubber plasticizer, such as dioctyl phthalate, approximately 10 parts by weight
~40 parts by weight; and a typical sulfur-based cure comprising about 0.5 to 6.0 parts by weight of sulfur and ~2.0 parts by weight of, for example, N-oxydiethylene-2-benzothiazyl sulfenamide. Accelerator system.

Depending on the elastic material or compounded elastic material used, it is also possible to use other well-known rubber plasticizers, such as polyethers, adipate esters and hyazelate esters. The question of which plasticizer to use and in what amount is well known to those skilled in the art of formulating elastomeric materials.

Reactive phenolic resins are methylene donating compounds (dono
r) are polymerizable, for example with hexamethylenetetramine, tetraethylenetetramine or hexamethoxymethylenemelamine.

Reactive hphenolic resins suitable for the elastic material of the tube 12 preferably include hexamethylenetetramine or include hexamethylenetetramine in the formulation. The melting point or softening point of these reactive example fats is 250
Should be below °F. Commercially available reactive phenolic resins include Ashland Chemicals (a division of Ashland Oil Company)'s "Allophane" series resin, Hooker Chemical's R-7'NeeV Tutu' series resin, and American Hoechst. There is a type of resin based on ``1 Arnovol'' produced by the company's industrial chemicals division.

Reactive phenolic resin systems are preferred due to their superior compatibility with sulfur-based hardener systems;
Other reactive resin systems (where "reactive" means polymerizable) can also be used in place of the phenolic resin system. As examples of these, the following resin systems can be used. - shellac + zinc oxide; resorcinol aldehyde resins; methylene-donating compounds such as hexamethylenetetramine; catecholaldehyde resins - methylene-donating compounds such as hexamethylenetetramine; monomeric organic peroxides including isocyanurates. ; monomeric organic peroxides containing acrylates; and monomeric organic peroxides containing allyl double bonds.

Representative examples of monomers useful in carrying out the present invention include the following compounds.

Allyl methacrylate; fumar e) allyl; triethylene glycol dimethacrylate; 1,6-butylene glycol diacrylate; 1,6-hexanediol dimethacrylate; taerythritol tetraacrylate; bisphenol A ethoxylated dimethacrylate ; trimethylolpronoξ trimethacrylate; triallyl cyanurate; triallyl isocyanurate, triallyl trimelide; and diallyl phthalate.

Additionally, representative examples of organic peroxides useful in the practice of the present invention include the following compounds.

Dicumyl R ruoxide; di-t-butyl ruoxide;
2,4-pentanedione peroxide; 2,5-dimethyl-2,5-bis(benzoyl is ruoxy)hexane;
n-butyl-4,4-bis(1-butylperoxy) valerate; and 1,1-'5-t-butylzuroxy-
6,3°5-trimethylcyclohexane. ~ The range of parts by weight indicated for the reactive resin system in the above general formulation is not the range required when other elastic materials or other resin systems are selected, but All of these are believed to provide adequate reinforcement to the elastomer used in the hose, including the tube 12 of the present invention. Determining the appropriate amount of reactive resin system to use will be readily apparent to those skilled in the art of formulating elastomeric materials. Although the use of short, discontinuous fibers is not essential, as can be seen from other formulations exemplified herein, such fibers are preferred for use in rotary digging hoses. This is because such fibers further enhance safety through other reinforcing mechanisms.

Examples of formulations that satisfy the above physical property conditions are listed below.

Each formulation is expressed as parts by weight per 100 parts of elastic material.

Example 1 100 Acrylonitrile-butadiene copolymer (acrylonitrile content: 62% by weight) 50 ASTM N-330 Carbon Black 10
Hydrated silica 20 Diallyl phthalate 1 Antioxidant 5 Zinc oxide 1 Stearic acid 30 Adhesive treated cellulose fiber (Santoweb
Kl) 25 Phenol formaldehyde resin (Duretsu 12686J) 2 Hexamethylenetetramine 1.5 Sulfur 1 Sulfenamide accelerator When the above components are blended and cured at 145°C for 60 minutes,
The following physical properties were obtained.

Tensile stress at 20% elongation D-4121000psi Elongation at break D-412290% Young's modulus
D-10533700psi Example 2 The following formulation has low resistance to petroleum-based drilling fluids and is not recommended for use in tubing for recess drilling hoses, but may be used in high-pressure water hoses. .

100 Styrene-butadiene copolymer (styrene content: 23% by weight) 85 ASTM N-330 carbon black 15
Aromatic petroleum base oil 6 Antioxidant filtration Zinc oxide 1 Stearic acid 20 Phenol resin (Alnovol VPN-16
: Hoechst Company M) 1.6 Hexamethylenetetramine 1.8 Sulfur 12 Sulfenamide accelerator When the above components were blended and cured at 145°C for 60 minutes, the following physical properties were obtained.

Tensile stress at elongation rate of 20% D-4'12. 750ps
i Breaking elongation D-412260% Young's modulus D-10536900psi example
6 100 Acrylonitrile-butadiene copolymer (acrylonitrile content: 69% by weight) 5 Zinc oxide 1 Stearic acid 40 ASTM N-550 Carbon Black 20
Trimethylolpropane trimethacrylate 4.40 parts by weight of inert filler-supported dicumyl oxide (Die-Cup 40C; available from Percules) The above ingredients were blended and cured at 155°C for 30 minutes, resulting in the following: Physical properties were obtained.

Tensile stress at 20% elongation D-412800 psi Elongation at break D-412160% Young's modulus D-10532500 psi When planning to manufacture rotary excavation hoses and the like, acrylonitrile-containing elastomeric materials are particularly desirable for the tubing. In this case, the content of acrylonitrile in the elastic material can be varied in the range of 17 to 50 parts by weight depending on the desired degree of chemical resistance, but the content of acrylonitrile is at least 20 parts by weight. It is preferable to have one.

14h of elastic material for burying the steel cable 15
, steel cable, a radially inner tube of elastic material 12 and a radially outer rubberized fabric layer 20 to promote adhesion. Compositions suitable for this purpose are well known to those skilled in the art and will not be described further here.

The thickness of the outer sheath 22 made of a special elastic material is 0.3' to sufficiently protect the hose body inside it.
Preferably, the length is between 8 cm and 1.14 cm.

Example 4 In a mixer, 85 parts of polyvinyl chloride, 92.4 parts of carboxylated acrylonitrile-butadiene rubber (AC9N 64 J manufactured by Polysal Chemical Co.), 10 parts of carboxylated acrylonitrile-butadiene rubber, 2 parts of stearic acid, and 50 parts of carbon black 2.00 parts of lubricant for mixing, 5.0 parts of furfural alcohol. A mixture consisting of part OO, 1.50 parts of oily furfural-butadiene adduct, and 0.50 parts of tetramethylslum monosulfide was mixed and kneaded, and the mixture was spread over the hose body in a layer with a thickness of about 0.6 solder. Coatings were prepared by extrusion followed by curing, preferably at 160°C for about 60-90 minutes.

Example 5 // Another coating was made as in Example 4, except that 70 parts of vinyl oxide and 261 parts of carboxylated acrylonitrile-butadiene were used.

This coating had a Shore hardness of 72, while the coating of Example 4 had a Shore hardness of 74. However, taper
r) The wear value was slightly higher for the coating of Example 5. The coating is approximately 4% in carboxylated acrylonitrile-butadiene.
When containing 0 to 70% polyvinyl chloride, A
Tear values measured with the STM Die C test method were improved. Therefore, these formulations have a highly desirable ASTM die C
It is particularly preferred because of its tear resistance. Also, other formulations can be used.

Although several exemplary embodiments have been disclosed in detail to illustrate the invention, those skilled in the art will recognize that various modifications can be made to the embodiments without departing from the scope of the invention. It is obvious for

[Brief explanation of the drawing]

Figure @1 is a cross-sectional view of a reinforced hose structure according to a preferred embodiment of the present invention. In the figure, 10... Hose structure, 11... Vertical axis of hose structure, 12... Tube, 14... Elastic material, 15...
Steel cable, 16, 18... Steel cable layer, 20. Rubberized woven fabric layer, 22... Covering.

Claims (4)

[Claims] (1) A reinforced hose structure comprising, from the inside to the outside: (A) a tube of elastic material; (B) two tubes embedded in the elastic material in opposite directions with respect to the longitudinal axis of the hose; A reinforced hose structure comprising: an inner reinforcing member and an outer reinforcing member wound in layers; and (C) a coating blended with carboxylated acrylonitrile-butadiene rubber forming the radially outermost surface of the hose. (2) The hose structure according to claim 1, wherein the coating material contains carboxylated acrylonitrile-butadiene rubber mixed with polyvinyl chloride. (3) The hose structure according to claim 2, wherein the coating material contains 40 to 70% by weight of polyvinyl chloride. (4) The elastic material has an elongation of at least 600% at 20% when measured according to ASTM Test Method 1)-412.
psi, an elongation at break of at least 150% when measured according to ASTM Test Method D-412, and a Young's Modulus of at least 2000 psi when measured according to ASTM Test Method D-1053. A hose structure according to claim 1.