High air tightness rubber-plastic composite oxygen tube

Abstract

The utility model provides a kind of high air-tightness rubber-plastic composite oxygen pipe, belong to rubber tube technical field, including from inside to outside sequentially adhesion sleeve connection setting inner layer, intermediate adhesive layer, rubber layer, steel wire layer and outer rubber layer, wherein inner layer is EVOH film and is used to barrier oxygen, improve the air-tightness of oxygen pipe, that is, with good oxygen barrier property, especially the barrier property of oxygen in high temperature environment is 100 times of rubber material, simultaneously with excellent chemical stability, ensure that there is no pollution in oxygen delivery process, the utility model will five-layer structure into an entirety, improve the pressure resistance of oxygen pipe, and easily prevent aging. The utility model provides a kind of high air-tightness rubber-plastic composite oxygen pipe, solve the technical problem that the air-tightness of oxygen pipe used in prior art is poor, pressure resistance is insufficient and easy to age, with high air-tightness, high pressure resistance, anti-aging, acid and alkali resistance, corrosion resistance and other characteristics.

Description

Technical Field

[0001] This utility model belongs to the field of hose technology, and more specifically, it relates to a high airtightness rubber-plastic composite oxygen hose. Background Technology

[0002] In the metallurgical industry, welding equipment commonly uses oxygen as a raw material for transportation. Oxygen hoses used for transporting oxygen must meet stringent application requirements, including key properties such as airtightness, pressure resistance, and flexibility. However, existing hoses are mostly made from a single material of rubber or plastic, and their overall performance is insufficient to fully meet these requirements.

[0003] Currently available oxygen hoses generally suffer from technical bottlenecks such as insufficient airtightness, easy aging, and poor pressure resistance. Especially under high-pressure or high-purity oxygen transmission conditions, these hoses are prone to leakage or oxygen contamination, seriously threatening safety and significantly shortening their service life.

[0004] Therefore, there is an urgent need to develop a high-pressure oxygen pipe that combines high airtightness, excellent pressure resistance, and good flexibility to address the shortcomings of existing technologies and improve the safety of oxygen transmission and the service life of equipment. Utility Model Content

[0005] The purpose of this invention is to provide a high airtightness rubber-plastic composite oxygen pipe, which aims to solve the technical problems of poor airtightness, insufficient pressure resistance and easy aging of oxygen pipes used in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high airtightness rubber-plastic composite oxygen tube is provided, comprising an inner layer, an intermediate adhesive layer, a rubber layer, a steel wire layer, and an outer adhesive layer; the inner layer, the intermediate adhesive layer, the rubber layer, the steel wire layer, and the outer adhesive layer are sequentially bonded and sleeved from the inside to the outside; the inner layer is an EVOH film and is used to block oxygen.

[0007] In one possible implementation, the thickness of the EVOH film is greater than the thickness of the intermediate adhesive layer.

[0008] In one possible implementation, the intermediate adhesive layer is a U-PE film.

[0009] In one possible implementation, the rubber layer is butyl rubber.

[0010] In one possible implementation, the thickness of the rubber layer is greater than the thickness of the inner layer or the intermediate adhesive layer.

[0011] In one possible implementation, the wire layer includes wires that are spirally wound around the outer wall of the rubber layer.

[0012] In one possible implementation, the diameter of the steel wire is greater than the thickness of the inner layer or the thickness of the intermediate adhesive layer.

[0013] In one possible implementation, the outer adhesive layer is chloroprene rubber.

[0014] In one possible implementation, the thickness of the outer adhesive layer is less than the thickness of the rubber layer.

[0015] In one possible implementation, the thickness of the outer adhesive layer is 1-1.5 mm.

[0016] The beneficial effects of the high airtightness rubber-plastic composite oxygen pipe provided by this utility model are as follows: Compared with the prior art, the high airtightness rubber-plastic composite oxygen pipe of this utility model includes an inner layer, an intermediate adhesive layer, a rubber layer, a steel wire layer, and an outer rubber layer, which are sequentially bonded and sleeved from the inside to the outside. The inner layer is an EVOH film used to block oxygen, which improves the airtightness of the oxygen pipe, that is, it has good oxygen barrier properties. In particular, its oxygen barrier properties in high-temperature environments are 100 times that of rubber materials. At the same time, it has excellent chemical stability, ensuring no pollution during oxygen transportation. This utility model combines five layers into a whole, which improves the pressure resistance of the oxygen pipe and easily prevents aging. It solves the technical problems of poor airtightness, insufficient pressure resistance, and easy aging of oxygen pipes used in the prior art. It has the characteristics of high airtightness, high pressure resistance, aging resistance, acid and alkali resistance, and corrosion resistance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a high airtight rubber-plastic composite oxygen pipe provided for an embodiment of this utility model;

[0019] Figure 2 for Figure 1 A bottom view of a high-airtightness rubber-plastic composite oxygen pipe.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Inner layer; 2. Intermediate adhesive layer; 3. Rubber layer; 4. Steel wire layer; 5. Outer adhesive layer. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Please refer to the following: Figures 1 to 2 The present invention provides a high airtightness rubber-plastic composite oxygen tube. The high airtightness rubber-plastic composite oxygen tube includes an inner layer 1, a middle adhesive layer 2, a rubber layer 3, a steel wire layer 4, and an outer rubber layer 5; the inner layer 1, the middle adhesive layer 2, the rubber layer 3, the steel wire layer 4, and the outer rubber layer 5 are sequentially bonded and sleeved from the inside out; the inner layer 1 is an EVOH film used to block oxygen.

[0027] This utility model provides a high airtightness rubber-plastic composite oxygen pipe. Compared with the prior art, it includes an inner layer 1, a middle adhesive layer 2, a rubber layer 3, a steel wire layer 4, and an outer rubber layer 5, which are sequentially bonded and sleeved from the inside to the outside. The inner layer 1 is an EVOH film used to block oxygen, which improves the airtightness of the oxygen pipe, that is, it has good oxygen barrier properties. In particular, its oxygen barrier properties in high-temperature environments are 100 times that of rubber materials. At the same time, it has excellent chemical stability, ensuring no pollution during oxygen transportation. This utility model combines five layers into a whole, which improves the pressure resistance of the oxygen pipe and easily prevents aging. It solves the technical problems of poor airtightness, insufficient pressure resistance, and easy aging of oxygen pipes used in the prior art. It has the characteristics of high airtightness, high pressure resistance, aging resistance, acid and alkali resistance, and corrosion resistance.

[0028] Preferably, the inner layer 1, the intermediate adhesive layer 2, the rubber layer 3, the steel wire layer 4, and the outer adhesive layer 5 are all hollow cylindrical structures, forming a five-layer oxygen tube. Adjacent layers are bonded together with adhesives or other bonding materials, resulting in good stability and preventing misalignment or movement, effectively ensuring connection quality and strength. This invention exhibits extremely high oxygen barrier properties, with an airtightness 100 times that of traditional oxygen tubes. During manufacturing, excellent bonding of rubber and plastic materials is achieved, simplifying processing and increasing production efficiency. Furthermore, the strong adhesion between the layers contributes to the good durability of the oxygen tube.

[0029] Specifically, during the manufacturing process, the outer adhesive layer 5 completely wraps the steel wire layer 4, the steel wire layer 4 completely wraps the rubber layer 3, the rubber layer 3 completely wraps the intermediate adhesive layer 2, and the intermediate adhesive layer 2 completely wraps the inner layer 1.

[0030] In some embodiments, please refer to Figures 1 to 2 The thickness of the EVOH film is greater than that of the intermediate adhesive layer 2. The inner layer 1 has a thickness of 0.2 mm and has good oxygen barrier properties, especially in high-temperature environments where its oxygen barrier properties are 100 times that of rubber materials. It also has excellent chemical stability, ensuring no pollution during oxygen transport.

[0031] The inner layer 1 uses a high-barrier EVOH (ethylene-vinyl alcohol copolymer) film with a thickness of 0.2 mm, whose oxygen permeability (OTR) at room temperature (25℃) is ≤0.1 cc / (m 2 •day·atm), OTR≤1.5cc / (m²) in high temperature environment (80℃) 2The material exhibits high-temperature oxygen barrier properties (day·atm), which are more than 100 times that of rubber materials. It also possesses excellent chemical stability, with acid and alkali resistance (mass loss rate <0.5% within the pH range of 3-11); furthermore, it exhibits no plasticizer migration (complies with GB9685-2016 food safety standards), ensuring zero pollution during oxygen delivery.

[0032] The oxygen permeability comparison between EVOH films and rubber materials is shown in the table below:

[0033] characteristic EVOH film Butyl rubber Oxygen permeability (OTR) <![CDATA[0.1-1cc· / (m 2 ·day·atm)]]> <![CDATA[10-50cc· / (m 2 ·day·atm)]]> Barrier Extremely high higher Humidity Barrier properties decrease significantly under high humidity. Less affected by humidity Mechanical properties It is brittle and has poor flexibility. Good flexibility and high elasticity

[0034] The EVOH film of this inner layer 1 is used as the inner lining of medical oxygen delivery hoses, and maintains an OTR ≤ 2.0 cc / (m²) even after high-temperature sterilization (121°C steam). 2 (day·atm) to avoid concentration decay caused by oxygen infiltration, and at the same time to prevent material leaching from contaminating medical oxygen.

[0035] In some embodiments, please refer to Figures 1 to 2 The intermediate adhesive layer 2 is a U-PE film. Specifically, the thickness of the U-PE film is 0.05mm. The U-PE film plays an adhesive role, bonding both the EVOH film and the rubber layer 3.

[0036] Specifically, U-PE film is a thin film made of ultra-high molecular weight polyethylene (UHMW-PE) resin through processes such as blow molding or casting. Its molecular weight is usually between 1.5 million and 6 million, or even higher, and it has excellent comprehensive performance.

[0037] Performance Characteristics: 1) Excellent Abrasion Resistance: Its abrasion resistance ranks among the top in plastics, second only to polytetrafluoroethylene (PTFE). Abrasion resistance further improves with increasing molecular weight. In mortar abrasion tests, its abrasion amount is only 1 / 2 that of polycarbonate and 1 / 3 that of nylon 66. 2) Good Impact Resistance: Among all engineering plastics, its impact strength ranks among the highest. Even at liquid nitrogen temperatures (-196℃), it maintains high impact strength, a property not possessed by other plastics. 3) Excellent Self-Lubricating Properties: With a low coefficient of friction of only 0.05-0.11, its abrasion resistance and anti-galling properties are superior to or equivalent to metals such as steel and brass under unlubricated conditions. It requires no oil lubrication and can operate under water lubrication conditions. 4) Chemical Corrosion Resistance: Except for a few strong solvents, it can withstand the erosion of various chemicals. It can operate stably in various chemical media such as sulfuric acid with a concentration ≤80%, nitric acid with a concentration ≤75%, hydrochloric acid with a concentration ≤20%, as well as alkalis, greases, and animal and vegetable oils. 5) Weather resistance: Excellent weather resistance; after two years of outdoor exposure, its strength and elongation retention rate can still maintain 60%-70% of their original values, and it also has good low-temperature impact resistance. 6) Antistatic and flame retardant properties: It has good antistatic properties, and its flame retardant performance can be improved by adding flame retardants, reaching GB8624-1997 level B2. 7) Hygienic and non-toxic: Completely hygienic and non-toxic, complying with US FDA and USDA standards, as well as environmental directives EN71 and RoHS, and can be used in conveying equipment in the food and pharmaceutical industries and in places requiring food hygiene.

[0038] Production processes: mainly include two methods: blow molding and casting. U-PE films produced by blow molding have high crystallinity and good isotropy, but large thickness tolerance and poor surface finish, and are mainly used in some fields where thickness accuracy requirements are not high. U-PE films produced by casting have small thickness tolerance and good surface finish, but the equipment is relatively complex and the cost is also higher, making them suitable for products with high requirements for dimensional accuracy and appearance.

[0039] In some embodiments, please refer to Figures 1 to 2 The third rubber layer is butyl rubber, with a thickness of 2mm. As a major component of the oxygen pipe, butyl rubber exhibits high oxygen barrier properties while also possessing good flexibility and anti-aging properties. Butyl rubber also has extremely low gas permeability and excellent chemical stability. The extremely low gas permeability indicates superior airtightness. The dense molecular structure of butyl rubber (high saturation, large side group volume) makes its barrier performance against small molecules like oxygen 8-10 times that of natural rubber, effectively preventing high-pressure oxygen leakage and meeting the mandatory high airtightness requirements of oxygen pipes. Even under high pressure (e.g., above 15MPa) and repeated bending conditions, it maintains stable sealing performance. The gas barrier efficiency of butyl rubber is ≤30cm. 3 / (m 2 ·24h·atm).

[0040] Excellent chemical corrosion resistance refers to its resistance to oxygen aging. The molecular chain contains no double bonds, and the saturation is >95%. Its antioxidant capacity far exceeds that of ordinary rubber (natural rubber, SBR), allowing it to be exposed to high-purity oxygen for extended periods without cracking or hardening, thus extending pipeline life. It also refers to its resistance to media corrosion, resisting corrosion from environmental media such as ozone, acids, alkalis, and water vapor, preventing leaks due to material deterioration.

[0041] Butyl rubber can also reduce infiltration contamination. Its low permeability can prevent external moisture from seeping into the pipe, thus avoiding contamination of the high-pressure oxygen flow. Moisture can accelerate the oxygen flow in metal pipes and cause the risk of combustion and explosion.

[0042] As a preferred embodiment, since both butyl rubber and EVOH film have barrier properties, the combination of butyl rubber and EVOH film in this invention results in a stronger or higher barrier property. Compared with the prior art, the barrier property is better, stronger, and higher, and the airtightness is also higher.

[0043] In some embodiments, please refer to Figures 1 to 2 The thickness of rubber layer 3 is greater than the thickness of inner layer 1 or intermediate adhesive layer 2.

[0044] In some embodiments, please refer to Figures 1 to 2 The steel wire layer 4 comprises multiple steel wires, all spirally wound around the outer wall of the rubber layer 3. These steel wires enhance the structural strength of the composite oxygen tube. The multiple steel wires can be in contact with each other or spaced apart. The adhesion between the steel wires and both the rubber layer 3 and the outer rubber layer 5 is relatively stable, preventing cracking.

[0045] Preferably, the diameter of the steel wire is 0.29 mm.

[0046] In some embodiments, please refer to Figures 1 to 2 The diameter of the steel wire is greater than the thickness of the inner layer 1 or the thickness of the intermediate adhesive layer 2. The steel wire ensures the structural strength of the oxygen tube, and multiple wires can be wound according to the length of the oxygen tube, improving the durability and service life of the oxygen tube.

[0047] In some embodiments, please refer to Figures 1 to 2The outer layer 5 is made of neoprene rubber. This neoprene rubber has a flame retardant rating of V-0, effectively preventing the spread of flames from the environment into the oxygen pipe and thus preventing damage. Neoprene rubber fully utilizes its dual functions of physical and active safety protection. Its core role is to act as a flame-retardant barrier, actively preventing fires and rapidly self-extinguishing flames within ≤10 seconds of exposure to open flames. It also inhibits molten droplets, preventing the ignition of surrounding flammable materials, and blocks the spread of fire, providing ultimate fire protection for pipelines in high-risk metallurgical scenarios such as welding spatter and proximity to high-temperature equipment.

[0048] Neoprene rubber has environmental erosion resistance: 1) It is resistant to ozone / UV radiation. The chlorine atoms in the molecule form a protective layer that resists ozone cracking (more than 5 times more resistant to ozone than natural rubber), making it suitable for outdoor operations. 2) It is resistant to oil and chemicals, resisting hydraulic oil and solvent splashes (expansion rate <10%), preventing structural deformation caused by outer layer expansion.

[0049] Neoprene rubber also possesses strong mechanical properties, including: 1) resistance to abrasion and tearing, high tensile strength (≥15MPa, ISO37), and abrasion resistance (Akron abrasion loss <0.2cm). 3 / 1.61km (ASTM D5963), resisting physical damage such as equipment friction and gravel impact. 2) Buffer stress, high elastic modulus absorbs external impact energy, protecting the inner airtight structure (butyl rubber and steel wire) from damage.

[0050] In some embodiments, please refer to Figures 1 to 2 The thickness of the outer rubber layer 5 is less than the thickness of the rubber layer 3.

[0051] In some embodiments, please refer to Figures 1 to 2 The outer adhesive layer 5 has a thickness of 1-1.5mm.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high airtight rubber-plastic composite oxygen pipe, characterized in that, It includes an inner layer, an intermediate adhesive layer, a rubber layer, a steel wire layer, and an outer adhesive layer; the inner layer, the intermediate adhesive layer, the rubber layer, the steel wire layer, and the outer adhesive layer are sequentially bonded and sleeved from the inside to the outside; the inner layer is an EVOH film and is used to block oxygen.

2. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The thickness of the EVOH film is greater than the thickness of the intermediate adhesive layer.

3. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The intermediate adhesive layer is a U-PE film.

4. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The rubber layer is butyl rubber.

5. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The thickness of the rubber layer is greater than the thickness of the inner layer or the intermediate adhesive layer.

6. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The steel wire layer includes steel wires that are spirally wound around the outer wall of the rubber layer.

7. A high airtight rubber-plastic composite oxygen pipe as described in claim 6, characterized in that, The diameter of the steel wire is greater than the thickness of the inner layer or the thickness of the intermediate adhesive layer.

8. The high airtightness rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The outer adhesive layer is made of chloroprene rubber.

9. A high airtight rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The thickness of the outer adhesive layer is less than the thickness of the rubber layer.

10. A high airtight rubber-plastic composite oxygen pipe as described in claim 1, characterized in that, The thickness of the outer adhesive layer is 1-1.5 mm.

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