Flexible high-pressure hose based on aramid-1414 woven outer layer, and preparation method therefor

Abstract

A flexible high-pressure hose based on an aramid-1414 woven outer layer. The flexible high-pressure hose comprises an inner hose layer, an aramid-1414 woven outer layer and a coating layer, wherein the aramid-1414 woven outer layer is coated on the outer surface of the inner hose layer, the aramid-1414 woven outer layer is formed by weaving aramid 1414, and the joints at both ends of the flexible high-pressure hose are coated with the coating layer. The raw materials of the inner hose layer comprise polyvinyl chloride, a high-polymerization-degree resin, p-benzene, calcium carbonate, stearic acid, a coloring agent, a processing aid, a coating aid and a softening agent. Further disclosed is a preparation method for the flexible high-pressure hose, comprising: step S1, mixing raw materials of the inner hose layer, then subjecting same to extrusion and traction to manufacture the inner hose layer; step S2, weaving aramid 1414 on the outer surface of the inner hose layer to form an aramid-1414 woven outer layer, so as to obtain the main body part of the flexible high-pressure hose; and step S3, coating the joints at both ends of the main body part of the flexible high-pressure hose with the coating layer. The flexible high-pressure hose has a burst resistance pressure of up to 900 Bar, has a wear-resistant outer layer, high foldability, and occupies little space during storage.

Description

A flexible high-pressure pipe based on aramid 1414 braided outer layer and its preparation method Technical Field

[0001] The present invention belongs to the technical field of energy transportation, and in particular relates to a flexible high-pressure pipe based on an aramid 1414 braided outer layer and a preparation method thereof. Background Art

[0002] Aramid fiber, short for aromatic polyamide fiber, is a new high-tech synthetic fiber with exceptional properties, including ultra-high strength, high modulus, high-temperature resistance, acid and alkali resistance, and lightweight. Aramid fiber is primarily divided into two types: para-aramid fiber (PPTA) and meta-aramid fiber (PMIA). PPTA fiber is also known as aramid 1414 and is often called "bulletproof fiber."

[0003] Aramid 1414, while golden in appearance and resembling shiny metallic threads, is actually a liquid crystal polymer composed of long, rigid molecules. Its highly oriented molecular chains and strong interchain bonds give the fiber unprecedented strength, high modulus, and high-temperature resistance. Aramid 1414 boasts exceptional strength, exceeding 28 g / denier, 5-6 times that of high-quality steel. Its modulus is 2-3 times that of steel or fiberglass, and its toughness is twice that of steel, yet it weighs only one-fifth as much. Aramid 1414 has an extremely wide continuous operating temperature range, operating continuously from -196°C to 204°C. Its shrinkage is zero at 150°C, and it neither decomposes nor melts at temperatures of 560°C. Its excellent insulation and corrosion resistance give it a long lifespan, earning it the reputation of "synthetic steel wire."

[0004] Aramid 1414 was first used in the military, including bulletproof vests, bulletproof helmets, stab- and cut-resistant clothing, bomb disposal suits, high-strength parachutes, bulletproof vehicle bodies, and armor plating. In bulletproof vests, aramid fiber, due to its high strength, toughness, and excellent weaving properties, absorbs and disperses the energy of bullet impact into the other fibers of the fabric, preventing blunt force trauma and providing significant protection. The lightweight design of aramid vests and helmets has effectively enhanced the military's rapid response and protective capabilities.

[0005] Beyond the military, aramid 1414-based reinforced composites are used as structural materials in aerospace, rockets, and aircraft, reducing weight, increasing payload, and conserving significant amounts of fuel. Due to its low specific gravity, high strength, excellent heat resistance, and excellent adhesion to rubber, aramid 1414 is an ideal tire cord fiber. Currently, major tire manufacturers such as Michelin, Goodyear, and Pirelli have adopted aramid 1414 as tire cord, with extensive use in luxury cars. In civil engineering, aramid 1414, due to its lightweight, high strength, high elastic modulus, corrosion resistance, electrical non-conductivity, and impact resistance, is used for the repair and maintenance of bridges, columns, subways, chimneys, water towers, tunnels, electrified railways, and seaports. It is particularly well-suited for the reinforcement and repair of concrete structures.

[0006] Flexible high-pressure pipes are generally categorized by application into oil, gas, water, and alcohol injection. Existing flexible high-pressure pipes generally suffer from low explosion-proof pressure, weak outer layers, poor foldability, and large storage footprint. Summary of the Invention

[0007] In order to solve the problems of the prior art, the present invention applies aramid 1414 to the outer layer of a flexible high-pressure pipe, and provides a flexible high-pressure pipe based on an aramid 1414 braided outer layer.

[0008] The specific technical solutions of the present invention are as follows:

[0009] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention is characterized in that it includes: an inner pipe layer, an aramid 1414 braided outer layer, the aramid 1414 braided outer layer is coated on the outer surface of the inner pipe layer, and the aramid 1414 braided outer layer is woven from aramid 1414.

[0010] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention also has the following technical characteristics, wherein the raw materials of the inner pipe layer include polyvinyl chloride, high-polymerization resin, purified paraben, calcium carbonate, stearic acid, colorant, processing aid, coating additive and softener.

[0011] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention also has the following technical features: the colorant is titanium dioxide, the processing aid is ACR-401, the coating additive is OB brightener, and the softener is chlorinated polyethylene.

[0012] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention also has the following technical features, wherein the raw materials of the inner pipe layer are: 25~55kg of polyvinyl chloride, 45~55kg of high-polymerization resin, 60~80kg of purified benzene, 40~60kg of calcium carbonate, 700~900g of stearic acid, 480~600g of colorant, 580~680g of processing aid, 90~110g of coating additive and 2~4kg of softener.

[0013] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention also has the following technical features: the flexible high-pressure pipe based on the aramid 1414 braided outer layer also includes a coating layer, which is coated on the two end joints of the flexible high-pressure pipe.

[0014] The present invention also provides a method for preparing the above-mentioned flexible high-pressure pipe based on the aramid 1414 braided outer layer, which is characterized in that it includes the following steps: step S1, mixing the raw materials of the inner pipe layer, extruding and pulling, and making the inner pipe layer; step S2, weaving aramid 1414 on the outer surface of the inner pipe layer to form an aramid 1414 braided outer layer, thereby obtaining the main body of the flexible high-pressure pipe; step S3, coating the joints at both ends of the main body of the flexible high-pressure pipe with a coating layer.

[0015] The flexible high-pressure pipe based on the aramid 1414 braided outer layer provided by the present invention has an explosion-proof pressure of up to 900 Bar, an outer layer that is resistant to wear, and is highly foldable, and takes up little space when folded and stored, because the outermost layer of the flexible high-pressure pipe adopts the aramid 1414 braided outer layer and is combined with an inner pipe layer made of specific raw materials.

[0016] Compared with the flexible high-pressure pipes in the existing technology, it has the technical advantages of greater explosion resistance, more wear-resistant outer layer, stronger foldability, and smaller space occupied when folded and stored.

[0017] Compared with the steel braided pipes in the prior art, it has a simple production process and is pollution-free. In applications in the construction industry, when the bending requirements are large, the steel braided pipes can be replaced to overcome the problem of poor bending performance of the steel braided pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a folding diagram of a flexible high-pressure tube based on an aramid 1414 braided outer layer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The terms used in the present invention generally have the meanings commonly understood by those skilled in the art unless otherwise specified.

[0020] In the following examples, various processes and methods not described in detail are conventional methods well known in the art.

[0021] The reagents used in the following examples were purchased from common commercial sources. The experimental operations and experimental conditions not specified were based on conventional operations and conditions in the art.

[0022] The specific implementation of the present invention is described below with reference to the embodiments and drawings.

[0023] <Example>

[0024] This embodiment provides a flexible high-pressure pipe based on an aramid 1414 braided outer layer, which includes: an inner pipe layer, an aramid 1414 braided outer layer, and a covering layer. The aramid 1414 braided outer layer is covered on the outer surface of the inner pipe layer. The aramid 1414 braided outer layer is woven from aramid 1414, and the covering layer is covered at the joints at both ends of the flexible high-pressure pipe.

[0025] The raw materials for the inner tube layer are: 25-55kg polyvinyl chloride, 45-55kg high-polymer resin, 60-80kg purified terephthalate, 40-60kg calcium carbonate, 700-900g stearic acid, 480-600g colorant, 580-680g processing aid, 90-110g coating additive, and 2-4kg softener. The colorant is titanium dioxide, the processing aid is ACR-401, the coating additive is OB brightener, and the softener is chlorinated polyethylene.

[0026] The raw material of the aramid 1414 braided outer layer is aramid 1414.

[0027] The raw materials of the covering layer are: PU, PA11, PA6 adhesive layer, rubber, winding cloth or rubber plastic.

[0028] This embodiment provides a method for preparing a flexible high-pressure pipe with an aramid 1414 braided outer layer, the method comprising:

[0029] Step S1: Mix the raw materials for the inner tube layer, extrude and draw them together to form the inner tube layer. The extruder is set at a sol temperature of 170°C, and the extrusion speed is 12.9 m / min through a custom mold to form a round tube with a wall thickness of 1.0 mm.

[0030] Step S2: Braiding aramid 1414 onto the outer surface of the inner tube layer to form an aramid 1414 braided outer layer, thereby obtaining the flexible high-pressure tube body. The braided windings consist of 24 strands, with a uniform network and no tight, loose, or fuzzy strands.

[0031] Step S3: coating the flexible high-pressure pipe main body at both end joints with a coating layer by a coating and pulling process.

[0032] The thickness of the inner tube layer of the prepared flexible high-pressure tube based on the aramid 1414 braided outer layer is 1.0 mm, and the thickness of the aramid 1414 braided outer layer is 0.3 mm.

[0033] <Test Example>

[0034] The explosion resistance performance test was conducted on the flexible high-pressure pipe with aramid 1414 braided outer layer prepared in the above embodiment.

[0035] The method for explosion resistance test is:

[0036] In the first explosion-proof test, a water pressure of 200 bar, twice the maximum operating pressure, was applied to the flexible high-pressure pipe and the pressure was maintained for 5 minutes.

[0037] In the second explosion-proof test, a water pressure of 900 bar, four times the maximum operating pressure, was applied to the flexible high-pressure pipe within 15-30 seconds.

[0038] The flexible high-pressure pipe with an aramid 1414 braided outer layer produced in the above embodiment did not burst in two explosion-proof tests, indicating that the explosion-proof pressure of the flexible high-pressure pipe is as high as 900 Bar.

[0039] FIG1 is a folding diagram of a flexible high-pressure tube based on an aramid 1414 braided outer layer according to an embodiment of the present invention.

[0040] As shown in Figure 1, the flexible high-pressure tube with an aramid 1414 braided outer layer in this embodiment can be folded like a rope without applying external force, and takes up little space when folded. Conventional flexible high-pressure tubes, on the other hand, need to be bent into a coil for storage, which requires significant external force to fold.

[0041] The above is a detailed description of the embodiments to facilitate proper understanding and application of the present invention by those skilled in the art. Any improvements or modifications to the technical solutions derived by those skilled in the art based on the present invention, without inventive effort, solely through analysis, analogy, or limited enumeration, should be within the scope of protection defined by the claims.

Claims

1. A flexible high-pressure pipe based on an aramid 1414 braided outer layer, characterized in that: include: An inner tube layer and an aramid 1414 braided outer layer, wherein the aramid 1414 braided outer layer is coated on the outer surface of the inner tube layer, and the aramid 1414 braided outer layer is braided by aramid 1414.

2. The flexible high-pressure pipe based on the aramid 1414 braided outer layer according to claim 1 is characterized in that: in, The raw materials of the inner tube layer include polyvinyl chloride, high-polymerization resin, purified benzene, calcium carbonate, stearic acid, colorant, processing aid, coating aid and softener.

3. The flexible high-pressure pipe based on the aramid 1414 braided outer layer according to claim 2 is characterized in that: in, The colorant is titanium dioxide, The processing aid is ACR-401, The coating additive is OB brightener, The softener is chlorinated polyethylene.

4. The flexible high-pressure pipe based on the aramid 1414 braided outer layer according to claim 2 is characterized in that: in, The raw materials of the inner tube layer are: 25-55kg polyvinyl chloride, 45-55kg high polymerization degree resin, 60-80kg refined benzene, 40-60kg calcium carbonate, 700-900g stearic acid, 480-600g colorant, 580-680g processing aid, 90-110g coating additive and 2-4kg softener.

5. The flexible high-pressure pipe based on the aramid 1414 braided outer layer according to claim 1, characterized in that: The flexible high-pressure pipe based on the aramid 1414 braided outer layer also includes a coating layer, and the coating layer is coated on the two end joints of the flexible high-pressure pipe.

6. A method for preparing a flexible high-pressure pipe based on an aramid 1414 braided outer layer as claimed in claims 1 to 5, characterized in that: The steps include: Step S1, mixing the raw materials of the inner tube layer, and then extruding and pulling to form the inner tube layer; Step S2, weaving aramid 1414 on the outer surface of the inner tube layer to form an aramid 1414 braided outer layer, to obtain a flexible high-pressure tube main body; Step S3, coating the joints at both ends of the main body of the flexible high-pressure pipe with a coating layer.

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