Heat-insulating flame-retardant hydraulic pipe and preparation method thereof

Abstract

The invention relates to the technical field of hydraulic pipe manufacturing, and discloses a heat-insulating flame-retardant hydraulic pipe and a preparation method thereof.The heat-insulating flame-retardant hydraulic pipe comprises an inner rubber layer and an outer rubber layer, the inner rubber layer and the outer rubber layer are tubular and comprise, by mass, 100 parts of chlorinated polyethylene, 20-40 parts of mica, 15-25 parts of aluminum silicate, 1-3 parts of flame retardant CP-70, 25-35 parts of carbon black N330, 1-3 parts of flame retardant, 3-7 parts of zinc borate and 20 parts of chlorinated paraffin, and the outer rubber layer is made of polypropylene. 2-6 parts of an anti-aging agent (chemical anti-aging agent), 1-4 parts of zinc oxide and 2-5 parts of an adhesive RS; the heat-insulating flame-retardant outer rubber layer is arranged on the peripheral side of the inner rubber layer in a wrapping manner; and the pressure-resistant layer is arranged between the inner rubber layer and the heat-insulating flame-retardant rubber layer. According to the heat-insulating and flame-retardant hydraulic pipe provided by the invention, the raw material formula of the rubber layer is optimally designed, so that the inner rubber layer has better performance; and the pressure-resistant layer and the heat-insulating and flame-retardant outer rubber layer are sequentially arranged on the peripheral side of the inner rubber layer, so that the high-pressure-resistant, heat-insulating and flame-retardant capabilities of the hydraulic pipe are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pipe manufacturing, and particularly relates to a heat-insulating and flame-retardant hydraulic pipe and a preparation method thereof. Background Art

[0002] Continuous casting technology is a technology that directly casts molten steel into a formed shape. Among them, the temperature of the molten steel in the tundish is about 1600 degrees. The sliding gate plays an important role in metallurgical engineering. The sliding gate hydraulic mechanism uses the upper and lower slide bricks to slide, thereby driving the opening and closing of the molten steel hole, precisely regulating the molten steel flow from the ladle to the continuous casting tundish, making the inflowing and outflowing molten steel reach balance, and then controlling the continuous casting operation. At present, in the industry, rubber hydraulic pipes are used to connect the hydraulic system pipelines at the sliding gate. Since the temperature at this position is very high, heat-resistant hydraulic pipes are required. For example, a heat-resistant hydraulic pipe disclosed in the patent with the publication number CN106752207A, that is, an epoxy anti-corrosion and heat-resistant layer is coated on the surface of the hydraulic pipe. However, there are still problems that oil molecules penetrate the rubber hydraulic pipe more quickly in a high-temperature environment, resulting in rubber swelling or hardening, and the disassembly and assembly of the nozzle hydraulic cylinder are frequent. High pressure and repeated bending will exacerbate the erosion of oil on the rubber, resulting in easy damage, oil leakage and fire of the rubber hydraulic pipe, short service life and unstable cycle. Summary of the Invention

[0003] In view of this, the present invention provides a heat-insulating and flame-retardant hydraulic pipe and a preparation method thereof to solve the problems that due to the very high temperature at the sliding gate and the working environment of the hydraulic pipe being under high pressure and repeated actions, oil molecules easily penetrate the rubber hydraulic pipe, resulting in easy damage, oil leakage and fire of the rubber hydraulic pipe, and short service life and unstable cycle.

[0004] In a first aspect, the present invention provides a heat-insulating and flame-retardant hydraulic pipe, including: Inner and outer rubber layers, in a tubular shape, including the following components in parts by mass: 100 parts of chlorinated polyethylene CPE, 20 - 40 parts of mica, 15 - 25 parts of aluminum silicate, 25 - 35 parts of carbon black N330, 1 - 3 parts of flame retardant, 3 - 7 parts of zinc borate, 20 parts of chlorinated paraffin, 2 - 6 parts of antioxidant, 1 - 4 parts of zinc oxide, 2 - 5 parts of adhesive RS; Heat-insulating and flame-retardant layer, wrapped around the outer peripheral side of the inner and outer rubber layers; Reinforcing layer, disposed between the inner and outer rubber layers and the heat-insulating and flame-retardant layer.

[0005] In an optional embodiment, the reinforcing layer is wound with steel wires, and the steel wires are wound around the outer peripheral wall of the inner and outer rubber layers.

[0006] In an optional embodiment, the number of the reinforcing layers is 2 - 6 layers.

[0007] In an alternative embodiment, the adiabatic flame-retardant layer includes an adiabatic rubber layer and a flame-retardant layer. The adiabatic rubber layer is sleeved on the outer peripheral side of the reinforcing layer, and the flame-retardant layer is wrapped on the outer peripheral wall of the adiabatic rubber layer.

[0008] In an alternative embodiment, the anti-aging agent includes chemical anti-aging agent 4010NA and anti-aging agent BLE, and the mass ratio of chemical anti-aging agent 4010NA to anti-aging agent BLE is 1:1.

[0009] In an alternative embodiment, the mass ratio of the flame retardant to zinc borate is (0.3 - 0.5):1.

[0010] In an alternative embodiment, the mass ratio of mica to aluminum silicate is (1.2 - 1.8):1.

[0011] In a second aspect, the present invention also provides a method for preparing the above-mentioned adiabatic flame-retardant hydraulic pipe. The preparation method includes: according to the mass fractions of each component, mixing chlorinated polyethylene (CPE), mica, aluminum silicate, carbon black N330, flame retardant, zinc borate, chlorinated paraffin, anti-aging agent, zinc oxide and adhesive RS into a mixed rubber through plasticizing and internal mixing processes; extruding the mixed rubber onto a tube carcass mold through an extruder to obtain a mixed rubber layer; winding steel wires on the mixed rubber layer on the surface of the tube carcass mold; wrapping an adiabatic flame-retardant layer outside the steel wires, and feeding it into a vulcanizing tank for vulcanization.

[0012] 1. The adiabatic flame-retardant hydraulic pipe provided by the present invention optimizes the raw material formulas of the inner and outer rubber layers, so that the prepared inner and outer rubber layers have better oil resistance, heat insulation and flame retardant properties, reduce the erosion of oil molecules on the inner and outer rubber layers, and reduce the possibility of the hydraulic pipe being eroded and damaged; and by sequentially arranging a reinforcing layer and an adiabatic flame-retardant layer on the outer peripheral side of the inner and outer rubber layers, the high-pressure resistance and adiabatic flame-retardant capabilities of the hydraulic pipe are ensured, thereby improving the service life and use stability of the hydraulic pipe.

[0013] 2. The adiabatic flame-retardant hydraulic pipe provided by the present invention sets two to six reinforcing layers to balance the requirements of cost, weight and compressive performance.

[0014] 3. The adiabatic flame-retardant hydraulic pipe provided by the present invention uses an adiabatic flame-retardant rubber layer to improve the heat insulation and flame retardant effects inside and outside the hydraulic pipe, and is beneficial to reducing the thermal expansion phenomenon of the steel wires; by using an adiabatic flame-retardant layer on the hydraulic pipe, the adiabatic flame-retardant performance of the hydraulic pipe is improved.

[0015] 4. The adiabatic and flame-retardant hydraulic pipe provided by the present invention uses antioxidant 4010NA and antioxidant BLE in a mass ratio of 1:1 for use, so as to synergistically improve the anti-aging ability of the inner and outer rubber layers; in addition, antioxidant BLE has a relatively high molecular weight, which can slow down the volatilization and extraction of antioxidant 4010NA, is beneficial to extending the residence time of the antioxidant, and improving the service life of the inner and outer rubber layers in contact with oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is the front view of an adiabatic and flame-retardant hydraulic pipe according to an embodiment of the present invention; Figure 2 is Figure 1 the cross-sectional schematic diagram of the shown adiabatic and flame-retardant hydraulic pipe.

[0018] Description of the reference numerals in the drawings: 1. Inner and outer rubber layers; 2. Reinforcing layer; 3. Adiabatic rubber layer; 4. Flame-retardant layer. SPECIFIC EMBODIMENTS

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0020] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 2 ,.

[0021] According to an embodiment of the present invention, on the one hand, an adiabatic and flame-retardant hydraulic pipe is provided, including: Inner and outer rubber layers 1, in a tubular shape, including the following components in parts by mass: chlorinated polyethylene (CPE) 100 parts, mica 20 - 40 parts, aluminum silicate 15 - 25 parts, flame retardant CP-70 1 - 3 parts, carbon black N330 25 - 35 parts, flame retardant 1 - 3 parts, zinc borate 3 - 7 parts, chlorinated paraffin 20 parts, antioxidant 2 - 6 parts, zinc oxide 1 - 4 parts, adhesive RS 2 - 5 parts; Adiabatic and flame-retardant layer, wrapped around the outer peripheral side of the inner and outer rubber layers 1; The reinforcing layer 2 is disposed between the inner and outer rubber layers 1 and the heat-insulating and flame-retardant layer.

[0022] For the heat-insulating and flame-retardant hydraulic pipe provided in this embodiment, by optimizing the raw material formula of the inner and outer rubber layers 1, the prepared inner and outer rubber layers 1 have better oil-resistant, heat-insulating and flame-retardant properties, reducing the erosion of oil molecules on the inner and outer rubber layers 1 and the possibility of the hydraulic pipe being eroded and damaged; and by sequentially disposing the reinforcing layer 2 and the heat-insulating and flame-retardant layer on the outer peripheral side of the inner and outer rubber layers 1, the high-pressure resistance and heat-insulating and flame-retardant capabilities of the hydraulic pipe are ensured, thereby improving the service life and service stability of the hydraulic pipe.

[0023] Specifically, the heat-insulating and flame-retardant hydraulic pipe is used to transport hydraulic oil. The outer surface of the rubber layer inside it is in long-term contact with oil molecules and is in a working environment of high temperature and frequent movement. Therefore, it is easily eroded and damaged by oil molecules. By optimizing the raw material formula of the inner and outer rubber layers 1, the oil-resistant and heat-insulating capabilities of the inner and outer rubber layers 1 are improved, the erosion of oil molecules on the inner and outer rubber layers 1 is reduced, and the service reliability and service life of the inner and outer rubber layers 1 are improved. The pressure-resistant layer 2 is tubular and sleeved on the outer peripheral wall of the inner and outer rubber layers 1 to improve the compressive capacity of the inner and outer rubber layers 1 and ensure the use safety of the hydraulic pipe. The heat-insulating and flame-retardant layer is tubular and wraps around the outer peripheral wall of the pressure-resistant layer 2. The heat-insulating and flame-retardant layer serves as the outer wall of the hydraulic pipe to improve the heat-insulating and flame-retardant capabilities of the hydraulic pipe, which is conducive to further improving the use safety of the hydraulic pipe.

[0024] In one embodiment, the reinforcing layer 2 is made of steel wire wound around the outer peripheral wall of the inner and outer rubber layers 1.

[0025] Specifically, the steel wire is helically wound around the outer peripheral wall of the inner and outer rubber layers 1 to form a tubular-like reinforcing layer 2.

[0026] In one embodiment, the number of the reinforcing layers 2 is 2 - 6 layers.

[0027] For the heat-insulating and flame-retardant hydraulic pipe provided in this embodiment, by setting two to six pressure-resistant layers 2, the requirements of cost, weight and compressive performance are balanced.

[0028] Specifically, along the radial direction of the hydraulic pipe, multiple reinforcing layers 2 are arranged from the inside to the outside. Further, the winding directions of two adjacent layers of steel wires are opposite, that is, one layer of steel wire is wound in the left-handed direction and the other layer of steel wire is wound in the right-handed direction. It can be understood that the innermost pressure-resistant layer 2 directly wraps around the outer peripheral wall of the inner and outer rubber layers 1, and the other reinforcing layers 2 are indirectly wrapped around the outer peripheral wall of the inner and outer rubber layers 1 through the innermost reinforcing layer 2.

[0029] The wire winding angles and tensions of the multiple reinforcing layers 2 arranged from the inside out decrease in sequence. Taking the case where there are four reinforcing layers 2 as an example, the winding angle and tension of the first layer of wire are relatively large, which are used to adapt to the thermal expansion and bending deformation of the inner and outer rubber layers 1; the winding angles and tensions of the second and third layers of wire are relatively small, which are used to improve the compressive and anti-burst capabilities of the hydraulic pipe; the winding angle and tension of the fourth layer of wire are the smallest, and it is wound at 44° - 54° so that the hydraulic pipe has a certain flexibility, which is beneficial to improving the bending life.

[0030] In one embodiment, in combination with Figure 1 and Figure 2 as shown, it includes a heat-insulating rubber layer 3 and a flame-retardant layer 4. The heat-insulating rubber layer 3 is sleeved on the outer peripheral side of the reinforcing layer 2, and the flame-retardant layer 4 is wrapped on the outer peripheral wall of the heat-insulating rubber layer 3.

[0031] For the heat-insulating and flame-retardant hydraulic pipe provided in this embodiment, by setting the heat-insulating rubber layer 3, the heat-insulating effect inside and outside the hydraulic pipe is improved, and it is beneficial to reduce the phenomenon of thermal expansion of the wire; by setting the flame-retardant layer 4 on the outermost side of the hydraulic pipe, the flame-retardant performance of the outer peripheral wall of the hydraulic pipe is improved.

[0032] Specifically, the heat-insulating rubber layer 3 is tubular and wraps around the outer peripheral wall of the reinforcing layer 2, which is used to improve the heat-insulating ability of the hydraulic pipe. The heat-insulating rubber layer 3 can isolate the wire from the high-temperature environment outside the hydraulic pipe, so as to weaken the amplitude of thermal expansion of the wire, improve the winding stability of the multiple layers of wire, and can effectively reduce the degree of accelerated erosion of the inner and outer rubber layers 1 by the hydraulic oil at high temperature by reducing heat transfer, and improve the overall reliability and service life of the hydraulic pipe.

[0033] In one embodiment, the flame-retardant layer 4 is used to directly resist external flames. The flame-retardant layer 4 can be attached to the outer peripheral wall of the heat-insulating rubber layer 3 in the form of winding or braiding.

[0034] In one embodiment, the anti-aging agent includes anti-aging agent 4010NA and anti-aging agent BLE, and the mass ratio of anti-aging agent 4010NA to anti-aging agent BLE is 1:1.

[0035] For the heat-insulating and flame-retardant hydraulic pipe provided in this embodiment, anti-aging agent 4010NA and anti-aging agent BLE are used in combination according to a mass ratio of 1:1 to synergistically improve the anti-aging ability of the inner and outer rubber layers 1; in addition, the molecular weight of anti-aging agent BLE is relatively high, which can slow down the volatilization and extraction of anti-aging agent 4010NA, is beneficial to extending the residence time of the anti-aging agent, and improves the service life of the inner and outer rubber layers 1 in contact with oil.

[0036] Specifically, antioxidant 4010NA is mainly used for resisting ozone aging and protecting against dynamic fatigue, antioxidant BLE is mainly used for protecting against thermal-oxidative aging. The synergistic use of antioxidant 4010NA and antioxidant BLE can improve the thermal air aging protection ability and dynamic fatigue life of the hydraulic tube compared with using them separately. Antioxidant 4010NA is in powder form, and antioxidant BLE is in liquid form. When they are used in a ratio of 1:1, it can also improve the mixing uniformity and avoid too high antioxidant concentration in local areas.

[0037] In one embodiment, the mass ratio of the flame retardant to zinc borate is (0.3 - 0.5):1.

[0038] In one embodiment, the mass ratio of mica to aluminum silicate is (1.2 - 1.8):1.

[0039] Specifically, mica is used to enhance the tensile strength of the inner and outer rubber layers 1, and aluminum silicate is used to fill the gap between the mica flakes to reduce stress concentration, thereby improving the toughness of the inner and outer rubber layers 1. If the proportion of mica is too low, it is likely to cause a decrease in the tensile strength of the inner and outer rubber layers 1. If the proportion of mica is too high, it is likely to cause a decrease in the toughness of the inner and outer rubber layers 1. The ratio of (1.2 - 1.8):1 is used to balance the enhancement of tensile strength and toughness.

[0040] According to an embodiment of the present invention, on the other hand, a method for preparing the above-mentioned adiabatic flame-retardant hydraulic tube is also provided. The preparation method includes: mixing chlorinated polyethylene (CPE), mica, aluminum silicate, carbon black N330, flame retardant, zinc borate, chlorinated paraffin, antioxidant, zinc oxide, and adhesive RS into a mixed rubber through plasticizing and kneading processes according to the mass fractions of each component; extruding the mixed rubber onto a tube carcass mold through an extruder to obtain a mixed rubber layer; winding steel wires on the mixed rubber layer on the surface of the tube carcass mold; wrapping an adiabatic flame-retardant layer outside the steel wires, and feeding it into a vulcanizing tank for vulcanization.

[0041] Specifically, prepare each raw material according to the mass fraction requirements, and mix all the raw materials into a mixed rubber through processes such as plasticizing and kneading. Extrude the mixed rubber onto a tube carcass mold through an extruder, and wind four layers of steel wires on the mixed rubber layer; set an adiabatic rubber layer 3 on the outermost steel wire layer; add a flame-retardant layer 4 outside the adiabatic rubber layer 3, thereby obtaining a hydraulic tube with oil resistance, high pressure resistance, and adiabatic flame retardancy.

[0042] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. An adiabatic and flame-retardant hydraulic pipe, characterized in that, Comprising: Inner and outer rubber layers (1), in tubular form, comprising the following components in parts by mass: chlorinated polyethylene (CPE) 100 parts, mica 20 - 40 parts, aluminum silicate 15 - 25 parts, carbon black N330 25 - 35 parts, flame retardant: 1 - 3 parts, zinc borate 3 - 7 parts, chlorinated paraffin 20 parts, anti - aging agent 2 - 6 parts, zinc oxide 1 - 4 parts, adhesive RS 2 - 5 parts; An adiabatic flame - retardant layer, wrapped and disposed on the outer peripheral side of the inner and outer rubber layers (1); A reinforcing layer (2), disposed between the inner and outer rubber layers (1) and the adiabatic flame - retardant layer.

2. The adiabatic and flame-retardant hydraulic pipe according to claim 1, wherein The reinforcing layer (2) is wound with steel wires, and the steel wires are wound on the outer peripheral wall of the inner and outer rubber layers (1).

3. The adiabatic and flame-retardant hydraulic pipe according to claim 2, wherein The number of the reinforcing layers (2) is 2 - 6 layers.

4. The adiabatic and flame-retardant hydraulic pipe according to claim 1, wherein The adiabatic flame - retardant layer comprises an adiabatic rubber layer (3) and a flame - retardant layer (4). The adiabatic rubber layer (3) is sleeved on the outer peripheral side of the reinforcing layer (2), and the flame - retardant layer (4) is wrapped and disposed on the outer peripheral wall of the adiabatic rubber layer (3).

5. The adiabatic and flame-retardant hydraulic pipe according to claim 1, characterized in that The anti - aging agent comprises chemical anti - aging agent 4010NA and anti - aging agent BLE, and the mass ratio of the chemical anti - aging agent 4010NA to the anti - aging agent BLE is 1:

1.

6. The adiabatic and flame-retardant hydraulic pipe according to claim 1, characterized in that The mass ratio of the flame retardant to the zinc borate is (0.3 - 0.5):

1.

7. The adiabatic and flame-retardant hydraulic pipe according to claim 1, wherein The mass ratio of the mica to the aluminum silicate is (1.2 - 1.8):

1.

8. A method for preparing the adiabatic and flame-retardant hydraulic pipe according to any one of claims 1 to 7, characterized in that, The preparation method includes: according to the mass fractions of each component, mixing chlorinated polyethylene (CPE), mica, aluminum silicate, carbon black N330, flame retardant, zinc borate, chlorinated paraffin, anti - aging agent, zinc oxide and adhesive RS into a mixed rubber by plasticizing and kneading processes; extruding the mixed rubber onto a tube carcass mold through an extruder to obtain a mixed rubber layer; winding steel wires on the mixed rubber layer on the surface of the tube carcass mold; wrapping an adiabatic flame - retardant layer outside the steel wires, and feeding it into a vulcanizing tank for vulcanization.

Images