High-cold-resistance PVC electrical conduit and preparation method thereof

Abstract

The invention discloses a highly cold-resistant PVC (polyvinyl chloride) electrical conduit and a preparation method thereof, and the highly cold-resistant PVC electrical conduit comprises the following components in parts by weight: 100 parts of PVC resin; 3-5 parts of a calcium-zinc stabilizer; 1.5 to 3 parts of a lubricant; 10 to 20 parts of a filling agent; 5 to 8 parts of a compound of methyl methacrylate and acrylate; 1-2 parts of a polyethylene elastomer; 0.5 to 1 part of an antioxidant aid; and 0.5 to 1 part of an anti-ultraviolet auxiliary agent. According to the invention, the defects caused by addition of a flexibilizer and a low-temperature impact-resistant agent can be well overcome by adopting a small amount of methyl methacrylate and acrylate compound, and the manufacturing cost, the production speed and the production stability are obviously improved; a small amount of polyethylene elastomer is used as an auxiliary toughening agent, so that slight weakening of a pure ester system to the rigidity of the base material is made up, and the impact resistance and the compression resistance are balanced.

Description

Technical Field

[0001] The invention relates to the technical field of PVC electrical conduit pipes, in particular to a highly cold-resistant PVC electrical conduit pipe and a preparation method thereof. Background Art

[0002] PVC electrical conduit is now widely used in construction. In the production of PVC electrical conduit, the commonly used combination is SG-5 resin powder, calcium zinc heat stabilizer, lubricant, composite lubricant, filler, toughening agent, low-temperature impact agent. Toughening agent and low-temperature impact agent play a vital role in the production of electrical conduit. In addition, the existing announcement number CN107722501B discloses a PVC conduit and its preparation method. PVC conduit is made of the following raw materials: PVC resin, active light calcium carbonate, heat stabilizer, pigment, impact modifier, lubricant, flame retardant. The prepared conduit has the advantages of high flame retardancy and strong compressive resistance, as well as good bending performance and resistance to low-temperature impact.

[0003] The addition of existing toughening agents and low-temperature impact agents to improve winter brittleness is too cumbersome. The attribution and characteristics of various toughening and low-temperature impact agents must be considered during adjustment. It is necessary to consider not only the conflict between the lubrication supply and the toughening system, but also the increase in manufacturing costs, production stability, and the impact on production efficiency due to excessive addition. In particular, excessive addition of toughening agents will affect the compressive strength of PVC electrical conduit. Toughening agents are mainly ethylene elastomers, which are easily decomposed during processing, resulting in overplasticization or poor plasticization. Adjustment of the lubrication system is required. Low-temperature impact agents play a major role in low-temperature impact resistance in the processing of PVC electrical conduit. The addition amount is extremely difficult to control, and the performance and cost of the adjusted product must also be considered. To this end, we propose a highly cold-resistant PVC electrical conduit and a preparation method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a highly cold-resistant PVC electrical conduit and a preparation method thereof, so as to solve the problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a highly cold-resistant PVC electrical conduit and a preparation method thereof, comprising the following components in parts by weight: PVC resin, 100 parts; Calcium zinc stabilizer, 3-5 parts; Lubricant, 1.5-3 parts; Filler, 10-20 parts; Methyl methate and acrylate compound, 5-8 parts; Polyethylene elastomer, 1-2 parts; Antioxidant, 0.5-1 part; Anti-ultraviolet additive, 0.5-1 part.

[0006] Preferably, the PVC resin is SG-5 resin powder.

[0007] Preferably, the lubricant comprises 1-2 parts of stearic acid and 0.5-1 part of a low melting point lubricant.

[0008] Preferably, the filler is calcium carbonate.

[0009] Preferably, the ratio of the methyl methate and acrylate compound is 7:3-8:2.

[0010] Preferably, it includes a tube body, which is provided with a plurality of through holes at equal intervals, a positioning rod is provided at one end of the tube body between adjacent through holes, and a positioning groove cooperating with the positioning rod is provided at the other end of the tube body; a plug is provided in the middle of one end of the tube body, and a socket cooperating with the plug is provided at the other end of the tube body.

[0011] Preferably, the tube body is provided with an opening structure on the side of the through hole, and the tube body is provided with a detachable side plate on the outside of the opening structure.

[0012] Preferably, the tube body is provided with a locking block on one side of the opening structure, and the side plate is provided with a hanging ear that cooperates with the locking block.

[0013] A method for preparing a highly cold-resistant PVC electrical conduit comprises the following steps: S1. Weighing of raw materials: Weigh PVC resin, calcium zinc stabilizer, lubricant, filler, methyl methate and acrylate compound, polyethylene elastomer, antioxidant, and anti-ultraviolet additive according to weight; S2. Mixing of raw materials: a. First add PVC resin and heat to 60-70℃ for slow preheating; b. Add calcium zinc heat stabilizer, antioxidant additive and anti-ultraviolet additive in sequence until mixed evenly; c. Add lubricant, continue to heat to 90-100°C, and mix for 5-8 minutes to allow the stabilizer to fully coat the resin particles; d. Slowly add the methyl methate and acrylate compound and polyethylene elastomer, heat and control the temperature at 110-120°C, and mix for 8-10 minutes until the material is in loose granular form; e. Add filler and lubricant, heat and control the temperature at 120-130℃, mix for 5-7 minutes to evenly disperse the filler; S3, extrusion molding: prepare the corresponding parts through a screw extruder; S4, cooling and shaping: cooling and shaping of parts are achieved through vacuum shaping box combined with spray cooling water tank; S5. Processing and assembly of parts.

[0014] The methyl methate and acrylate compound needs to be mixed evenly according to the proportion before adding to the subsequent mixing steps.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By using a compound of methyl methate and acrylate and adding a small amount of it, the shortcomings caused by adding toughening agents and low-temperature impact agents can be well solved, and the manufacturing cost, production speed and production stability are significantly improved.

[0016] By utilizing a compound of methyl methate and acrylate, copolymerization of the ester monomers creates an elastic network structure within the PVC matrix, enhancing low-temperature impact resistance (maintaining flexibility below -10°C). This product also offers superior compatibility with PVC compared to traditional elastomers, reducing plasticization issues caused by poor compatibility during processing.

[0017] A small amount of polyethylene elastomer acts as a secondary toughening agent, compensating for the slight reduction in substrate rigidity caused by pure ester systems and balancing impact and compression resistance. The added amount is only 1 / 3-1 / 2 of that of traditional solutions, reducing costs and processing risks.

[0018] The cooperation of the positioning rod and the positioning groove facilitates the positioning of adjacent tubes; the plug and the jack realize the plugging and locking between adjacent tubes; the opening structure facilitates the passage of cables, and the opening structure is covered by the side panel to protect the exposed cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the tube body of the present invention; Figure 3 It is a structural schematic diagram of the side panel of the present invention.

[0020] In the figure: 1. Tube body; 2. Side panel; 3. Plug; 4. Positioning rod; 5. Locking block; 6. Through hole; 7. Hanging ear. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0022] In an embodiment of the present invention, a highly cold-resistant PVC electrical conduit comprises the following components in parts by weight: PVC resin, 100 parts; Calcium zinc stabilizer, 3-5 parts; Lubricant, 1.5-3 parts; Filler, 10-20 parts; Methyl methate and acrylate compound, 5-8 parts; Polyethylene elastomer, 1-2 parts; Antioxidant, 0.5-1 part; Anti-ultraviolet additive, 0.5-1 part.

[0023] The PVC resin is SG-5 resin powder; the lubricant is 1-2 parts of stearic acid and 0.5-1 part of low melting point lubricant; the filler is calcium carbonate; the ratio of the methyl methate and acrylate compound is 7:3-8:2.

[0024] The use of a combination of methyl methate and acrylate, along with a small amount of a polyethylene elastomer, effectively addresses the shortcomings of adding toughening agents and low-temperature impact agents, significantly improving manufacturing costs, production speed, and stability. By using a combination of methyl methate and acrylate, the copolymerization of ester monomers forms an elastic network structure within the PVC matrix, enhancing low-temperature impact resistance (maintaining flexibility below -10°C). Its compatibility with PVC is superior to that of traditional elastomers, reducing plasticization issues caused by poor compatibility during processing. A small amount of polyethylene elastomer acts as a secondary toughening agent, compensating for the slight reduction in substrate rigidity caused by pure ester systems and balancing impact and compressive properties. The addition dosage is only 1 / 3-1 / 2 of that of traditional solutions, reducing costs and processing risks.

[0025] See also Figure 1-3, a highly cold-resistant PVC electrical conduit, further comprising a tube body 1, wherein the tube body 1 is provided with a plurality of through holes 6 at equal intervals, and a positioning rod 4 is provided at one end of the tube body 1 between adjacent through holes 6, and the other end of the tube body 1 is provided with a positioning groove that cooperates with the positioning rod 4, and the cooperation of the positioning rod and the positioning groove facilitates the positioning of adjacent tube bodies 1; a plug 3 is provided in the middle of one end of the tube body 1, and the other end of the tube body 1 is provided with a jack that cooperates with the plug 3, and the plug and the jack realize the plugging and locking between adjacent tube bodies; the tube body 1 is provided with an opening structure on the side of the through hole 6, and the opening structure facilitates the passage of cables, and the tube body 1 is detachably installed with a side plate 2 on the outside of the opening structure, and the opening structure is blocked by the side plate 2, thereby protecting the exposed cables; the tube body 1 is provided with a locking block 5 on one side of the opening structure, and the side plate 2 is provided with a hanging ear 7 that cooperates with the locking block 5.

[0026] A method for preparing a highly cold-resistant PVC electrical conduit comprises the following steps: S1. Weighing of raw materials: Weigh PVC resin, calcium zinc stabilizer, lubricant, filler, methyl methate and acrylate compound, polyethylene elastomer, antioxidant, and anti-ultraviolet additive according to weight; S2. Mixing of raw materials: a. First add PVC resin and heat to 60-70℃ for slow preheating; b. Add calcium zinc heat stabilizer, antioxidant additive and anti-ultraviolet additive in sequence until mixed evenly; c. Add lubricant, continue to heat to 90-100°C, and mix for 5-8 minutes to allow the stabilizer to fully coat the resin particles; d. Slowly add the methyl methate and acrylate compound, polyethylene elastomer, heat and control the temperature at 110-120 ° C, mix for 8-10 minutes, so that the material is loose granular; methyl methate and acrylate compound need to be mixed in proportion before adding the subsequent mixing step; e. Add filler and lubricant, heat and control the temperature at 120-130℃, mix for 5-7 minutes to evenly disperse the filler; S3, extrusion molding: prepare the corresponding parts through a screw extruder; S4, cooling and shaping: cooling and shaping of parts are achieved through vacuum shaping box combined with spray cooling water tank; S5. Processing and assembly of parts.

[0027] The working principle of the present invention is as follows: the coordination of the positioning rod and positioning groove facilitates the positioning of adjacent tubes 1; the plug and jack enable the insertion and locking of adjacent tubes; the opening structure facilitates the passage of cables, and the side panels 2 shield the opening structure, thereby protecting exposed cables; the use of a methyl methacrylate and acrylate compound, combined with a small amount of a toughening agent and a low-temperature impact agent, effectively overcomes the shortcomings of adding a toughening agent and a low-temperature impact agent, while significantly improving manufacturing costs, production speed, and production stability. The use of the methyl methacrylate and acrylate compound, through the copolymerization of ester monomers, forms an elastic network structure in the PVC matrix, improving low-temperature impact resistance.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A highly cold-resistant PVC electrical conduit, characterized in that: The composition comprises the following components in parts by weight: PVC resin, 100 parts; Calcium zinc stabilizer, 3-5 parts; Lubricant, 1.5-3 parts; Filler, 10-20 parts; Methyl methate and acrylate compound, 5-8 parts; Polyethylene elastomer, 1-2 parts; Antioxidant, 0.5-1 part; Anti-ultraviolet additive, 0.5-1 part.

2. The highly cold-resistant PVC electrical conduit according to claim 1, characterized in that: The PVC resin is SG-5 resin powder.

3. The highly cold-resistant PVC electrical conduit according to claim 1, characterized in that: The lubricant comprises 1-2 parts of stearic acid and 0.5-1 part of a low melting point lubricant.

4. The highly cold-resistant PVC electrical conduit according to claim 1, characterized in that: The filler is calcium carbonate.

5. The highly cold-resistant PVC electrical conduit according to claim 1, characterized in that: The ratio of the methyl methate and acrylate compound is 7:3-8:

2.

6. The highly cold-resistant PVC electrical conduit according to claim 1, characterized in that: The invention comprises a tube body (1), wherein the tube body (1) is provided with a plurality of through holes (6) at equal intervals, a positioning rod (4) is provided at one end of the tube body (1) between adjacent through holes (6), and a positioning groove cooperating with the positioning rod (4) is provided at the other end of the tube body (1); a plug (3) is provided in the middle of one end of the tube body (1), and a socket cooperating with the plug (3) is provided at the other end of the tube body (1).

7. The highly cold-resistant PVC electrical conduit according to claim 6, characterized in that: The tube body (1) is provided with an opening structure on the side of the through hole (6), and the tube body (1) is provided with a detachable side plate (2) on the outside of the opening structure.

8. The highly cold-resistant PVC electrical conduit according to claim 7, characterized in that: The tube body (1) is provided with a locking block (5) on one side of the opening structure, and the side plate (2) is provided with a hanging ear (7) that cooperates with the locking block (5).

9. The method for preparing a highly cold-resistant PVC electrical conduit according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Weighing of raw materials: Weigh PVC resin, calcium zinc stabilizer, lubricant, filler, methyl methate and acrylate compound, polyethylene elastomer, antioxidant, and anti-ultraviolet additive according to weight; S2. Mixing of raw materials: a. First add PVC resin and heat to 60-70℃ for slow preheating; b. Add calcium zinc heat stabilizer, antioxidant additive and anti-ultraviolet additive in sequence until mixed evenly; c. Add lubricant, continue to heat to 90-100°C, and mix for 5-8 minutes to allow the stabilizer to fully coat the resin particles; d. Slowly add the methyl methate and acrylate compound and polyethylene elastomer, heat and control the temperature at 110-120°C, and mix for 8-10 minutes until the material is in loose granular form; e. Add filler and lubricant, heat and control the temperature at 120-130℃, mix for 5-7 minutes to evenly disperse the filler; S3, extrusion molding: prepare the corresponding parts through a screw extruder; S4, cooling and shaping: cooling and shaping of parts are achieved through vacuum shaping box combined with spray cooling water tank; S5. Processing and assembly of parts.

10. The method for preparing a highly cold-resistant PVC electrical conduit according to claim 9, characterized in that: The methyl methate and acrylate compound needs to be mixed evenly according to the proportion before adding to the subsequent mixing steps.

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