CPVC cable protection pipe and preparation method thereof

Abstract

The application relates to the technical field of cable protection pipes, and more particularly discloses a CPVC cable protection pipe and a preparation method thereof, which comprises an outer anticorrosion layer, a middle pressure boosting layer and an inner wear-resistant layer. The outer anticorrosion layer is composed of the following raw materials in parts by mass: CPVC resin 50-70 parts, PVC resin 30-45 parts, anti-aging agent 15-20 parts, high-temperature-resistant agent 12-13 parts, impact-resistant agent 9-10 parts, plastic reinforcing agent 1-3 parts, flame retardant 8-9 parts, lubricant 3-4 parts and plasticizer 2-5 parts. The middle pressure boosting layer is composed of the following raw materials in parts by mass. The application adopts the alternating reinforcing structure of the middle pressure boosting layer, the stable supporting effect of the middle pressure boosting layer on the whole is greatly improved after injection molding, and the material of the middle pressure boosting layer has better fluidity than that of the outer anticorrosion layer and the inner wear-resistant layer, so that the material of the pressure boosting layer can still fill each part of the middle pressure boosting layer mold without being affected by the complex pipeline during the injection molding process of the middle pressure boosting layer, and good production effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of cable protection pipe technology, and more specifically to a CPVC cable protection pipe and its preparation method. Background Technology

[0002] CPVC cable protection pipes are widely used in urban power grid construction and renovation projects, urban municipal renovation projects, and urban street light cable laying, serving as guides and protectors. CPVC cable protection pipes are made of PVC-C resin with excellent heat resistance and insulation properties. CPVC products are recognized as green and environmentally friendly products, and their excellent physical and chemical properties are receiving increasing attention from the industry.

[0003] Currently, the CPVC cable protection pipes used are generally designed as an integrated unit, which is directly cooled and formed after being extruded from a mold. Due to the inherent characteristics of CPVC resin, the protection pipes are characterized by poor toughness and fragility during use, which affects their long-term use in environments with high vibration and high frequency impact, such as under roads. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a CPVC cable protection pipe and its preparation method to solve the problems existing in the background art.

[0005] This invention provides the following technical solution: a CPVC cable protection pipe and its preparation method, comprising an outer anti-corrosion layer, a middle pressure-boosting layer and an inner wear-resistant layer, wherein the outer anti-corrosion layer is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high-temperature resistant agent, 9-10 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer;

[0006] The intermediate pressure layer is composed of the following raw materials in parts by weight: 45-50 parts of CPVC resin, 65-67 parts of PVC resin, 10-12 parts of anti-aging agent, 15-18 parts of high temperature resistant agent, 8-9 parts of impact resistant agent, 3-4 parts of plastic reinforcing agent, 1-2 parts of flame retardant, 1-2 parts of lubricant, and 5-10 parts of plasticizer.

[0007] The inner wear-resistant layer is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high temperature resistant agent, 12-15 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer.

[0008] The steps are as follows:

[0009] Step 1: Soften CPVC resin and PVC resin at 110℃ and 1.5Mpa for 2 to 3 hours. Then, place the corresponding proportions of CPVC resin and PVC resin into three different containers. Add anti-aging agent, high-temperature resistant agent, impact resistant agent, insulation reinforcing agent, flame retardant, lubricant, and plasticizer in the containers according to the different proportions of the outer anti-corrosion layer, middle pressure-boosting layer, and inner wear-resistant layer, and stir to mix for subsequent use.

[0010] Step 2: The mixed outer anti-corrosion layer, middle pressure layer, and inner wear-resistant layer materials from Step 1 are melt-extruded separately through three single-screw extruders, with one single-screw extruder for each layer. The mixed inner wear-resistant layer material is injected into the screw extruder for granulation. The resulting raw material granules are placed in the feeder and extruded into the mold through high-temperature plasticization of the barrel and mold. After cooling to 50-70℃, the mold is removed to obtain the inner wear-resistant layer blank. The mold for the middle pressure layer, which is fixed on the outside, is replaced. The material of the middle pressure layer is extruded into the mold and the inner wear-resistant layer blank according to the above steps. The mold is heated to 100℃ and held for 0.2 hours, then cooled to 60℃. The outer mold is then replaced with the mold for the outer anti-corrosion layer, and the outer anti-corrosion layer material is extruded. After completion, the temperature is raised to 90℃ and held for 0.5 hours. The formed CPVC cable protection pipe is then removed and cooled with cooling water.

[0011] Furthermore, the inner surface of the outer anti-corrosion layer and the outer surface of the inner wear-resistant layer are both smooth surfaces. A fixing groove for the middle pressure layer is opened on the inner side of the outer anti-corrosion layer, and an outer fixing groove is opened on the outer surface of the inner wear-resistant layer. The structure includes a support module, and a flow guiding module is fixedly connected between the support modules.

[0012] Furthermore, the impact-resistant agent is composed of acrylonitrile-butadiene-styrene copolymer (MBS) and chlorinated polyethylene (CPE) in a mass ratio of 1:1.2.

[0013] Furthermore, the plastic reinforcing agent includes calcium carbonate, clay, and talc, and the ratio used in the manufacturing process is 1:1.5:0.8.

[0014] Furthermore, the plasticizer is a phthalate and an epoxy fatty acid methyl ester used in a ratio of 1:3.

[0015] Furthermore, the lubricant is methyl methacrylate.

[0016] Furthermore, the flame retardant is aluminum hydroxide, which is prepared by reacting sulfuric acid with aluminum powder or aluminum ash to generate aluminum sulfate, and then reacting it with ammonium bicarbonate in a metathesis reaction to obtain aluminum hydroxide.

[0017] Furthermore, the outer anti-corrosion layer has a flow channel with a flow guiding module on the inner side of the mold used in the injection molding process.

[0018] Furthermore, the outer anti-corrosion layer, the middle pressure-boosting layer, and the inner wear-resistant layer all have the same internal diameter in the mold used during the injection molding process, which is the inner diameter of the outer anti-corrosion layer.

[0019] The technical effects and advantages of this invention are as follows:

[0020] 1. This invention employs an alternating reinforcement structure of the intermediate pressure layer, which significantly enhances the overall stability and support of the intermediate pressure layer after injection molding. Furthermore, the material used in the intermediate pressure layer has better fluidity than the outer anti-corrosion layer and inner wear-resistant layer, allowing the material in the intermediate pressure layer to fill various parts of the mold without being affected by complex piping during the injection molding process, thus achieving excellent production results.

[0021] 2. The external anti-corrosion layer of the present invention maintains excellent anti-oxidation effect against the external environment during long-term use by increasing the content of high-temperature resistant agent, avoiding the brittleness of existing CPVC cable protection pipes after use. Moreover, under harsh environmental conditions, the CPVC cable protection pipe can also perform excellently, protecting the internal cables, thus improving the applicability of the CPVC cable protection pipe and expanding the range of application conditions.

[0022] 3. The inner wear-resistant layer of the present invention, by increasing the proportion of high-temperature resistant materials used in CPVC cable protection pipes, can provide good protection for the internal environment during long-term use. When high temperatures occur externally, it can minimize internal overheating and prevent interference during cable transmission, thus reducing the frequency of failures. At the same time, increasing the proportion of flame retardant in the material of the inner wear-resistant layer can effectively reduce the impact of fire when internal or external overload occurs, while reducing the overall material cost while ensuring good performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the intermediate pressure layer structure of the present invention.

[0025] The attached diagram is labeled as follows: 1. Outer anti-corrosion layer; 2. Middle pressurization layer; 201. Support module; 202. Flow guiding module; 3. Inner wear-resistant layer. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The CPVC cable protection pipe and its preparation method involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] Reference Figure 1-2 This invention provides a CPVC cable protection pipe and its preparation method, comprising an outer anti-corrosion layer 1, a middle pressure-boosting layer 2, and an inner wear-resistant layer 3. The outer anti-corrosion layer 1 is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high-temperature resistant agent, 9-10 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer.

[0029] The intermediate pressure layer 2 is composed of the following raw materials in parts by weight: 45-50 parts of CPVC resin, 65-67 parts of PVC resin, 10-12 parts of anti-aging agent, 15-18 parts of high temperature resistant agent, 8-9 parts of impact resistant agent, 3-4 parts of plastic reinforcing agent, 1-2 parts of flame retardant, 1-2 parts of lubricant, and 5-10 parts of plasticizer.

[0030] The inner wear-resistant layer 3 is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high temperature resistant agent, 12-15 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer.

[0031] The steps are as follows:

[0032] Step 1: Soften CPVC resin and PVC resin at 110℃ and 1.5Mpa for 2 to 3 hours. Then, take the corresponding proportions of CPVC resin and PVC resin and place them in three different containers. Add anti-aging agent, high temperature resistant agent, impact resistant agent, insulation reinforcing agent, flame retardant, lubricant, and plasticizer in different proportions of the outer anti-corrosion layer 1, middle pressure-boosting layer 2, and inner wear-resistant layer 3, and stir and mix them for subsequent use.

[0033] Step Two: The materials of the outer anti-corrosion layer 1, the middle pressure layer 2, and the inner wear-resistant layer 3, which were mixed in Step One, are melt-extruded separately through three single-screw extruders, one for each layer. The mixed inner wear-resistant layer 3 material is injected into the screw extruder for granulation. The resulting raw material granules are placed in the feeder and extruded into the die through high-temperature plasticization of the barrel and die. After cooling to 50-70℃, the die is removed to obtain the blank of the inner wear-resistant layer 3. The die of the middle pressure layer 2, which is fixed on the outside, is replaced. The material of the middle pressure layer 2 is extruded into the die and the blank of the inner wear-resistant layer 3 according to the above steps. The die is heated to 100℃ and held for 0.2 hours, then cooled to 60℃. The outer die is then replaced with the die of the outer anti-corrosion layer 1, and the material of the outer anti-corrosion layer 1 is extruded. After completion, the temperature is raised to 90℃ and held for 0.5 hours. The formed CPVC cable protection pipe is then removed and cooled with cooling water to soften the CPVC resin and PVC resin. The temperature is generally 90-110℃. After the inner wear-resistant layer 3 is injection molded, a certain amount of cooling can maintain the shape of the inner wear-resistant layer 3. At this time, when the second injection is performed, the shape formed by the inner wear-resistant layer 3 will not change. The material of the middle pressure layer 2 is gradually filled into the fixed groove outside the inner wear-resistant layer 3. By further heating, the two can be kept at 100℃ for 0.2 hours to melt and solidify. Similarly, after the middle pressure layer 2 is injection molded, it is cooled to 60℃ to start the injection process of the outer anti-corrosion layer 1. Since the outer side of the outer anti-corrosion layer 1 is a smooth arc surface, the temperature after heating is 90℃ to keep the middle pressure layer 2 and the inner wear-resistant layer 3 softened, so as to achieve a fixed connection with the outer anti-corrosion layer 1. Since the outer anti-corrosion layer 1 itself has good fluidity and is located on the outside, the outer anti-corrosion layer 1 can fill the gaps between the middle pressure layer 2 during the injection process, ensuring that there are no air bubbles inside.

[0034] The inner surface of the outer anti-corrosion layer 1 and the outer surface of the inner wear-resistant layer 3 are both smooth surfaces. The inner side of the outer anti-corrosion layer 1 is provided with a fixing groove for the middle pressure layer 2, and the outer surface of the inner wear-resistant layer 3 is provided with a fixing groove for the outer side of the middle pressure layer 2. The middle pressure layer 2 includes a support module 201, and a flow guiding module 202 is fixedly connected between the support modules 201.

[0035] The impact-resistant agent is composed of acrylonitrile-butadiene-styrene copolymer (MBS) and chlorinated polyethylene (CPE) in a mass ratio of 1:1.2.

[0036] The plastic reinforcing agent includes calcium carbonate, clay, and talc, and the ratio used in the manufacturing process is 1:1.5:0.8.

[0037] The plasticizer is a mixture of phthalate and epoxy fatty acid methyl ester in a ratio of 1:3.

[0038] The lubricant is methyl methacrylate.

[0039] The flame retardant is aluminum hydroxide, which is prepared by reacting sulfuric acid with aluminum powder or aluminum ash to generate aluminum sulfate, and then reacting it with ammonium bicarbonate in a double decomposition reaction to obtain aluminum hydroxide.

[0040] The outer anti-corrosion layer 1 has a flow channel with a flow guide module 202 on the inner side of the mold used in the injection molding process. During the processing, improving the fluidity of the intermediate pressure layer helps the material of the intermediate pressure layer to fill various parts of the intermediate pressure layer mold without being affected by complex pipelines, thus producing a better plasticizing effect.

[0041] The outer anti-corrosion layer 1, the middle pressure-boosting layer 2, and the inner wear-resistant layer 3 all use molds with the same internal diameter during injection molding. This ensures good support for the produced CPVC cable protection pipe during production, preventing processing errors such as blistering. At the same time, during the heating process, the internal cylindrical mold also plays a role in heat conduction, ensuring that the temperature of the CPVC cable protection pipe remains constant throughout.

[0042] In this embodiment, by employing an alternating reinforcement structure of the intermediate pressure layer, the overall stability and support provided by the intermediate pressure layer after injection molding is significantly improved. Simultaneously, the material used in the intermediate pressure layer has better fluidity compared to the outer anti-corrosion layer and inner wear-resistant layer. This allows the material of the pressure layer to fill all parts of the intermediate pressure layer mold during the injection molding process, even without the influence of complex piping, achieving good production results. By increasing the content of high-temperature resistant agent in the outer anti-corrosion layer, it maintains excellent anti-oxidation properties during long-term use, avoiding the brittleness characteristic of existing CPVC cable protection pipes after use. Furthermore, under harsh environmental conditions, this… CPVC cable protection pipes also exhibit excellent performance, effectively protecting the internal cables and improving their applicability and range of application conditions. By increasing the proportion of high-temperature resistant materials used in the wear-resistant layer inside the CPVC cable protection pipe, they provide excellent protection for the internal environment during long-term use. When external high temperatures occur, they minimize the risk of internal overheating and interference during cable transmission, reducing the frequency of failures. Furthermore, increasing the proportion of flame retardants in the inner wear-resistant layer effectively reduces the impact of fires caused by internal or external overloads, while simultaneously lowering overall material costs while maintaining good performance.

[0043] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0044] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0045] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CPVC cable protection pipe, comprising an outer anti-corrosion layer (1), a middle pressure-boosting layer (2), and an inner wear-resistant layer (3), characterized in that: The outer anti-corrosion layer (1) is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high temperature resistant agent, 9-10 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer. The intermediate pressure layer (2) is composed of the following raw materials in parts by weight: 45-50 parts of CPVC resin, 65-67 parts of PVC resin, 10-12 parts of anti-aging agent, 15-18 parts of high temperature resistant agent, 8-9 parts of impact resistant agent, 3-4 parts of plastic reinforcing agent, 1-2 parts of flame retardant, 1-2 parts of lubricant, and 5-10 parts of plasticizer. The inner wear-resistant layer (3) is composed of the following raw materials in parts by weight: 50-70 parts of CPVC resin, 30-45 parts of PVC resin, 15-20 parts of anti-aging agent, 12-13 parts of high temperature resistant agent, 12-15 parts of impact resistant agent, 1-3 parts of plastic reinforcing agent, 8-9 parts of flame retardant, 3-4 parts of lubricant, and 2-5 parts of plasticizer. The steps are as follows: Step 1: Soften CPVC resin and PVC resin at 110℃ and 1.5Mpa for 2 to 3 hours. Then, take the corresponding proportions of CPVC resin and PVC resin and place them in three different containers. Add anti-aging agent, high temperature resistant agent, impact resistant agent, plastic reinforcing agent, flame retardant, lubricant and plasticizer in different proportions of the outer anti-corrosion layer (1), middle pressure layer (2) and inner wear-resistant layer (3) and stir and mix them for subsequent use. Step 2: The materials of the outer anti-corrosion layer (1), the middle pressure layer (2) and the inner wear-resistant layer (3) mixed in Step 1 are melt-extruded through three single screw extruders. Each layer corresponds to one single screw extruder. The mixed inner wear-resistant layer (3) material is injected into the screw extruder for granulation. The obtained raw material granules are placed in the feeder and extruded into the mold through high temperature plasticization of the barrel and the mold. After cooling to 50-70℃, the mold is removed to obtain the blank of the inner wear-resistant layer (3). The mold of the middle pressure layer (2) fixed on the outside is replaced. The material of the middle pressure layer (2) is extruded into the mold and the blank of the inner wear-resistant layer (3) according to the above steps. The mold is heated to 100℃ and held for 0.2h, and then cooled to 60℃. Then the outer mold is replaced with the mold of the outer anti-corrosion layer (1). The material of the outer anti-corrosion layer (1) is extruded. After completion, the temperature is raised to 90℃ and held for 0.5h. The formed CPVC cable protection pipe is removed and cooled by cooling water. The inner surface of the outer anti-corrosion layer (1) and the outer surface of the inner wear-resistant layer (3) are both smooth surfaces. The inner side of the outer anti-corrosion layer (1) is provided with a fixing groove for the middle pressure layer (2). The outer surface of the inner wear-resistant layer (3) is provided with a fixing groove for the outer side of the middle pressure layer (2). The middle pressure layer (2) includes a support module (201). A flow guiding module (202) is fixedly connected between the support modules (201). The impact-resistant agent is composed of acrylonitrile-butadiene-styrene copolymer (MBS) and chlorinated polyethylene (CPE) in a mass ratio of 1:1.

2.

2. The CPVC cable protection pipe according to claim 1, characterized in that: The plastic reinforcing agent includes calcium carbonate, clay, and talc, and the ratio used in the manufacturing process is 1:1.5:0.

8.

3. The CPVC cable protection pipe according to claim 1, characterized in that: The plasticizer is a mixture of phthalate and epoxy fatty acid methyl ester in a ratio of 1:

3.

4. The CPVC cable protection pipe according to claim 1, characterized in that: The lubricant is methyl methacrylate.

5. A CPVC cable protection pipe according to claim 1, characterized in that: The flame retardant is aluminum hydroxide, which is prepared by reacting sulfuric acid with aluminum powder or aluminum ash to generate aluminum sulfate, and then reacting it with ammonium bicarbonate in a double decomposition reaction to obtain aluminum hydroxide.

6. A CPVC cable protection pipe according to claim 1, characterized in that: The outer anti-corrosion layer (1), the middle pressure layer (2) and the inner wear-resistant layer (3) have the same internal diameter in the mold used during the injection molding process, which is the inner diameter of the outer anti-corrosion layer (1).

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