PVC-O cable conduit production process

Abstract

The invention provides a PVC-O cable conduit production process. The PVC-O cable conduit production process is characterized in that a PVC-O cable conduit is prepared from the following raw materials in parts by mass: 100 parts of polyvinyl chloride resin; 10 to 30 parts of ABS resin; 5 to 10 parts of MBS resin; 10 to 20 parts of CPE resin; 3-6 parts of a calcium-zinc stabilizer; 1-2 parts of an ACR processing aid; 1-2 parts of an ACR impact modifier; and 0.3 to 1.2 parts of a lubricant. The PVC-O cable conduit production process comprises the following steps: adding raw materials into a high-speed mixer for mixing, then putting into cold mixing equipment for cooling, and then discharging for later use; the mixture enters a screw machine barrel through a hopper to be heated and pre-plasticized; extruding into a PVC-U pipe blank by using a mold; the PVC-U pipe blank is subjected to traction treatment through traction equipment, so that the PVC-U pipe blank is subjected to axial stretching and radial stretching, the stretched pipe is cooled and shaped through a shaping water tank and then led out through the traction equipment, and the PVC-O pipe is obtained. The finished pipe has better axial strength and circumferential strength.

Description

Technical Field

[0001] This invention relates to the field of plastic pipe technology, and in particular to a manufacturing process for PVC-O cable conduits. Background Technology

[0002] To ensure the long-term safe use of buried electrical wires and cables, steel pipes were previously commonly used for sheathing. While steel pipes are strong, they are also highly conductive, posing a significant safety risk. Subsequently, PVC plastic pipes gradually replaced steel pipes as the mainstream sheathing material. However, after years of use, PVC pipes have also revealed some drawbacks: poor high-temperature resistance, making them prone to deformation in hot environments; lower toughness and strength, and poor resistance to cracking and impact. Therefore, improvements to existing cable conduits are necessary. Summary of the Invention

[0003] In order to solve the above problems, the present invention aims to provide a manufacturing process for PVC-O cable conduits.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a manufacturing process for PVC-O cable conduits, characterized in that the PVC-O cable conduits are prepared using the following parts by weight of raw materials:

[0006]

[0007] Calcium and zinc stabilizer 3-6 parts;

[0008] 1-2 parts of ACR processing aid;

[0009] 1-2 parts of ACR impact modifier;

[0010] 0.3-1.2 parts of lubricant.

[0011] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following feature: wherein the polyvinyl chloride resin is SG-5 type polyvinyl chloride resin.

[0012] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following feature: wherein the total amount of ABS resin, MBS resin and CPE resin is not less than 30 parts.

[0013] Furthermore, the PVC-O cable conduit manufacturing process provided by this invention may also have the following characteristics: the PVC-O cable conduit has an outer diameter of 110 mm, a wall thickness of 5.0 mm, an axial tensile strength of 47 MPa, and a ring stiffness of 26 kN / m. 2 .

[0014] Furthermore, the PVC-O cable conduit manufacturing process provided by the present invention includes the following steps:

[0015] Step 1: After weighing, add the raw materials to a high-speed mixer for mixing, then put them into a cold mixing device for cooling before discharging and setting aside for use.

[0016] Step 2: The material obtained in Step 1 is fed into the hopper and then into the screw barrel for heating and pre-plasticization.

[0017] Step 3: Extrude the material obtained in Step 2 into a PVC-U pipe blank using a mold;

[0018] Step 4: The PVC-U pipe blank obtained in Step 3 is subjected to traction treatment by traction equipment, so that the PVC-U pipe blank is stretched axially and radially. The stretched pipe is cooled and shaped by a shaping water tank, and then pulled out by traction equipment to obtain PVC-O pipe.

[0019] Step 5: Cut the formed PVC-O pipes, inspect them, and put them into storage if they pass the inspection.

[0020] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following features: wherein, in step one, the mixing time in the high-speed mixer is 40-60 minutes, and the cold mixing equipment cools the mixture to below 40°C.

[0021] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following features: wherein, the processing in step four is specifically as follows: at a set temperature, high-pressure gas is introduced into the spacer and expansion plug of the extruder through the inner operating tube to cause the billet tube to expand radially, and at the same time, the billet tube is stretched axially by the traction machine.

[0022] Furthermore, the PVC-O cable conduit production process provided by this invention may also have the following feature: wherein the set temperature is 60-100℃.

[0023] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following characteristics: wherein the radial expansion ratio of the blank tube is 2:1, and the axial stretching ratio of the blank tube is 20%-30%.

[0024] Furthermore, the PVC-O cable conduit production process provided by the present invention may also have the following features: before expansion and stretching, the PVC-U pipe blank is treated by a vacuum heating device using a traction machine, so that the molecules of the PVC-U pipe blank are transformed from disordered arrangement to ordered arrangement. The treatment temperature is 60-100℃ and the treatment time is 15-30 minutes.

[0025] The function and effects of this invention:

[0026] The PVC-O cable conduit of this invention is prepared using specific component raw materials and a specific production process. By subjecting the pipe blank to axial and radial stretching, the long-chain PVC molecules in the pipe are arranged in a biaxial, regular pattern to form a network structure, which significantly improves the pipe's resistance to scratches and crack propagation, thereby achieving high strength, high toughness, and high impact resistance. The axial and circumferential strength of the finished pipe are significantly increased. This invention achieves reduced wall thickness while maintaining the strength of the pipe, resulting in material savings and cost reduction, and bringing significant economic and social benefits. Detailed Implementation

[0027] To make the technical means, creative features, and achieved objectives and effects of this invention easily understood, the following embodiments are provided in conjunction with the technical solution of this invention. These embodiments are merely preferred embodiments of this invention and are not intended to limit the scope of protection of this invention. For those skilled in the art, this invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention are included within the scope of protection of this invention.

[0028] <Example 1>

[0029] The PVC-O cable conduit in this embodiment is prepared using the following process. This embodiment produces a PVC-O pipe with an outer diameter of 110 mm and a wall thickness of 5.0 mm.

[0030] Step 1: The raw materials are divided into the following parts by weight: 100 parts of SG-5 type polyvinyl chloride resin; 10 parts of ABS resin; 5 parts of MBS resin; 20 parts of CPE resin; 3 parts of calcium-zinc stabilizer; 2 parts of ACR processing aid; 2 parts of ACR impact modifier; and 1 part of lubricant.

[0031] After weighing, the raw materials are added to a high-speed mixer and mixed for 40 minutes. Then, they are placed in a cold mixing device to cool to below 40°C and discharged for later use.

[0032] Step 2: The material obtained in Step 1 is fed into the hopper and then into the screw barrel for heating and pre-plasticization.

[0033] Step 3: Extrude the material obtained in Step 2 into PVC-U pipe blanks using a mold.

[0034] Step four: Before expansion and stretching, the PVC-U pipe blank is heated using a vacuum heating device via a traction machine. This heats the PVC-U pipe blank from a disordered arrangement to an ordered arrangement of molecules. The treatment temperature is 80℃, and the treatment time is 25 minutes. Then, the PVC-U pipe blank obtained in step three is stretched using a traction device. At a set temperature of 80℃, high-pressure gas is introduced through the inner operating tube between the separator plug and the expansion plug at the extruder, causing the blank to expand radially. Simultaneously, the traction machine stretches the blank axially. The radial expansion ratio of the blank is 2:1, and the axial stretching ratio is 20%. The stretched pipe is cooled and shaped in a shaping water tank, and then drawn out by the traction device to obtain the PVC-O pipe.

[0035] Step 5: Cut the formed PVC-O pipes, inspect them, and put them into storage if they pass the inspection.

[0036] <Example 2>

[0037] The PVC-O cable conduit in this embodiment is prepared using the following process. This embodiment produces a PVC-O pipe with an outer diameter of 110 mm and a wall thickness of 5.0 mm.

[0038] Step 1: The raw materials are divided into the following parts by weight: 100 parts of SG-5 type polyvinyl chloride resin; 30 parts of ABS resin; 10 parts of MBS resin; 10 parts of CPE resin; 6 parts of calcium-zinc stabilizer; 2 parts of ACR processing aid; 2 parts of ACR impact modifier; and 1.2 parts of lubricant.

[0039] After weighing, the raw materials are added to a high-speed mixer and mixed for 60 minutes. Then, they are placed in a cold mixing equipment to cool to below 40°C and discharged for later use.

[0040] Step 2: The material obtained in Step 1 is fed into the hopper and then into the screw barrel for heating and pre-plasticization.

[0041] Step 3: Extrude the material obtained in Step 2 into PVC-U pipe blanks using a mold.

[0042] Step four: Before expansion and stretching, the PVC-U pipe blank is heated using a vacuum heating device via a traction machine. This heats the PVC-U pipe blank from a disordered arrangement to an ordered arrangement of molecules. The treatment temperature is 100℃, and the treatment time is 20 minutes. Then, the PVC-U pipe blank obtained in step three is stretched using a traction device. At a set temperature of 100℃, high-pressure gas is introduced through the inner operating tube between the separator plug and the expansion plug at the extruder, causing the blank to expand radially. Simultaneously, the traction machine stretches the blank axially. The radial expansion ratio of the blank is 2:1, and the axial stretching ratio is 20%. The stretched pipe is cooled and shaped in a shaping water tank, and then drawn out by the traction device to obtain the PVC-O pipe.

[0043] Step 5: Cut the formed PVC-O pipes, inspect them, and put them into storage if they pass the inspection.

[0044] <Example 3>

[0045] The PVC-O cable conduit in this embodiment is prepared using the following process. This embodiment produces a PVC-O pipe with an outer diameter of 110 mm and a wall thickness of 4.5 mm.

[0046] Step 1: The raw materials are divided into the following parts by weight: 100 parts of SG-5 type polyvinyl chloride resin; 25 parts of ABS resin; 8 parts of MBS resin; 15 parts of CPE resin; 5 parts of calcium-zinc stabilizer; 1.5 parts of ACR processing aid; 1.5 parts of ACR impact modifier; and 1 part of lubricant.

[0047] After weighing, the raw materials are added to a high-speed mixer and mixed for 50 minutes. Then, they are placed in a cold mixing device to cool to below 40°C and discharged for later use.

[0048] Step 2: The material obtained in Step 1 is fed into the hopper and then into the screw barrel for heating and pre-plasticization.

[0049] Step 3: Extrude the material obtained in Step 2 into PVC-U pipe blanks using a mold.

[0050] Step four: Before expansion and stretching, the PVC-U pipe blank is heated using a vacuum heating device via a traction machine. This heats the PVC-U pipe blank from a disordered arrangement to an ordered arrangement of molecules. The treatment temperature is 90℃, and the treatment time is 15 minutes. Then, the PVC-U pipe blank obtained in step three is stretched using a traction device. At a set temperature of 80℃, high-pressure gas is introduced through the inner operating tube between the separator plug and the expansion plug at the extruder, causing the blank to expand radially. Simultaneously, the traction machine stretches the blank axially. The radial expansion ratio of the blank is 2:1, and the axial stretching ratio is 20%. The stretched pipe is cooled and shaped in a shaping water tank, and then drawn out by the traction device to obtain the PVC-O pipe.

[0051] Step 5: Cut the formed PVC-O pipes, inspect them, and put them into storage if they pass the inspection.

[0052] <Comparative Example 1>

[0053] The raw material composition of Comparative Example 1 is different from that of Example 1, but the production process is the same as that of Example 1. Comparative Example 1 prepared a pipe with an outer diameter of 110 mm and a wall thickness of 5.0 mm.

[0054] The raw material components of Comparative Example 1 are as follows:

[0055]

[0056] <Comparative Example 2>

[0057] Comparative Example 2 used the same raw materials as Example 1. Comparative Example 1 prepared a pipe with an outer diameter of 110 mm and a wall thickness of 5.0 mm.

[0058] Its production process is as follows:

[0059] Step one is the same as in Example 1.

[0060] Step two is the same as in Example 1.

[0061] Step 3 is the same as in Example 1.

[0062] Step four: Cut the formed PVC-U pipes, inspect them, and put them into storage if they pass the inspection.

[0063] Performance Testing

[0064] Axial tensile tests and ring stiffness tests were conducted on the pipes obtained in Examples 1, 2, and 3, as well as Comparative Examples 1 and 2. The test data are shown in the table below:

[0065] Pipes Outer diameter (mm) Wall thickness (mm) Axial tensile strength (MPa) <![CDATA[Ring stiffness (kN / m 2 )]]> Example 1 110 5.0 45 23 Example 2 110 5.0 47 26 Example 3 110 4.5 41 21 Comparative Example 1 110 5.0 40 19 Comparative Example 2 110 5.0 35 16

[0066] As shown in the table above, for the same pipe diameter and wall thickness, the pipes of Examples 1 and 2 exhibit higher axial and circumferential strengths compared to the comparative examples. This demonstrates that the formulation components of the present invention, combined with a specific production process, can significantly improve the axial and circumferential strength of the pipes. While the wall thickness of Example 3 is reduced compared to Examples 1 and 2, it still possesses higher axial tensile strength and circumferential stiffness than comparative examples 1 and 2. Therefore, the method of the present invention can save raw materials and reduce costs in production by reducing the wall thickness.

Claims

1. A manufacturing process for PVC-O cable conduits, characterized in that: The PVC-O cable conduit is prepared using the following parts by weight of raw materials:

2. The PVC-O cable conduit manufacturing process as described in claim 1, characterized in that: in, The polyvinyl chloride resin is SG-5 type polyvinyl chloride resin.

3. The PVC-O cable conduit manufacturing process as described in claim 1, characterized in that: in, The total amount of the ABS resin, MBS resin, and CPE resin shall not be less than 30 parts.

4. The PVC-O cable conduit manufacturing process as described in any one of claims 1-3, characterized in that: The process includes the following steps: Step 1: After weighing, add the raw materials to a high-speed mixer for mixing, then put them into a cold mixing device for cooling before discharging and setting aside for use. Step 2: The material obtained in Step 1 is fed into the hopper and then into the screw barrel for heating and pre-plasticization. Step 3: Extrude the material obtained in Step 2 into a PVC-U pipe blank using a mold; Step 4: The PVC-U pipe blank obtained in Step 3 is subjected to traction treatment by traction equipment, so that the PVC-U pipe blank is stretched axially and radially. The stretched pipe is cooled and shaped by a shaping water tank, and then pulled out by traction equipment to obtain PVC-O pipe. Step 5: Cut the formed PVC-O pipes, inspect them, and put them into storage if they pass the inspection.

5. The PVC-O cable conduit manufacturing process as described in claim 4, characterized in that: in, In step one, the mixing time in the high-speed mixer is 40-60 minutes, and the cold mixing equipment cools the mixture to below 40°C.

6. The PVC-O cable conduit manufacturing process as described in claim 4, characterized in that: in, The specific process in step four is as follows: at a set temperature, high-pressure gas is introduced into the spacer and expansion plug of the extruder through the inner operating tube to cause the billet tube to expand radially, and at the same time, the billet tube is stretched axially by the traction machine.

7. The PVC-O cable conduit manufacturing process as described in claim 6, characterized in that: in, The set temperature is 60-100℃.

8. The PVC-O cable conduit manufacturing process as described in claim 6, characterized in that: in, The radial expansion ratio of the billet tube is 2:1, and the axial stretching ratio of the billet tube is 20%-30%.

9. The PVC-O cable conduit manufacturing process as described in claim 6, characterized in that: in, Before expansion and stretching, the PVC-U pipe blank is heated by a vacuum heating device using a traction machine, so that the molecules of the PVC-U pipe blank change from disordered arrangement to ordered arrangement. The treatment temperature is 60-100℃ and the treatment time is 15-25 minutes.

10. The PVC-O cable conduit manufacturing process as described in claim 4, characterized in that: in, The prepared PVC-O cable conduit has an outer diameter of 110 mm, a wall thickness of 5.0 mm, an axial tensile strength of 47 MPa, and a ring stiffness of 26 kN / m. 2 .

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