Insulating plastic particle and method for producing the same

Abstract

To provide an insulating plastic particle and a method for producing the same.SOLUTION: An insulating plastic particle includes 90 pts.wt. to 110 pts.wt. of polyvinyl chloride (PVC) powder, 10 pts.wt. to 20 pts.wt. of calcium-containing filler, 2 pts.wt. to 8 pts.wt. of a calcium zinc stabilizer, 30 pts.wt. to 50 pts.wt. of a plasticizer, and 0.1 pts.wt. to 20 pts.wt. of an additive. The calcium-containing filler includes calcium carbonate powder and calcined kaolin powder, and a weight ratio between a content of the calcined kaolin powder and a content of the calcium carbonate powder (calcined kaolin powder:calcium carbonate powder) is between 1:2 and 2:1. A weight ratio between a content of the calcium zinc stabilizer and a content of the calcium-containing filler (calcium zinc stabilizer:calcium-containing filler)is between 1:4 and 1:7.5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to insulating plastic particles and a method for producing the same, and more particularly to insulating plastic particles for producing cable insulation layers and a method for producing the same. [Background technology]

[0002] Although cable insulation can be manufactured using existing polyvinyl chloride (PVC) plastic particles, there is a problem in that the capacitance value becomes unstable when a cable covered with the cable insulation layer is immersed in water. Furthermore, when a cable covered with a cable insulation layer made with existing polyvinyl chloride (PVC) plastic particles is immersed in hot water at about 90°C for a long period of time, the capacitance value decreases so much that it affects the transmission effect of the cable covered with the cable insulation layer. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem that the present invention aims to solve is to provide insulating plastic particles and a manufacturing method thereof, which address the shortcomings of the prior art and solve the problem that when a cable covered with a cable insulation layer made from existing polyvinyl chloride (PVC) plastic particles is immersed in water, the capacitance value tends to become unstable. [Means for solving the problem]

[0004] To solve the above technical problems, one of the technical means adopted by the present invention provides insulating plastic particles. The insulating plastic particles include 90 to 110 parts by weight of polyvinyl chloride (PVC) powder having an average degree of polymerization of 1,100 to 1,400, 10 to 20 parts by weight of a calcium-containing filler having an average particle size of 1 μm to 2 μm, 2 to 8 parts by weight of a calcium-zinc stabilizer, 30 to 50 parts by weight of a plasticizer, and 0.1 to 20 parts by weight of at least one additive selected from the group consisting of a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid, and the calcium-containing filler includes calcium carbonate powder and calcined kaolin powder, and the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder) is The weight ratio of the calcium zinc stabilizer content to the calcium-containing filler content (calcium zinc stabilizer:calcium-containing filler) is 1:2 to 2:1, the insulating plastic particles form a cable insulation layer by extrusion molding, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed for 1 day, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by less than 10% compared to when the cable is immersed for 7 days.

[0005] Preferably, the content of the calcium carbonate powder in the calcium-containing filler is 1 to 5 parts by weight, and the content of the calcined kaolin powder is 10 to 15 parts by weight.

[0006] Preferably, the plasticizer is at least one selected from the group of materials consisting of triisooctyl trimellitate (TOTM), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) adipate (DOA), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP).

[0007] Preferably, the additive includes 0.1 to 3 parts by weight of at least one heat stabilizer selected from the group of materials consisting of barium cadmium heat stabilizers, calcium zinc heat stabilizers, and tin heat stabilizers; 0.1 to 3 parts by weight of stearic acid selected from the group of materials consisting of zinc stearate, barium stearate, magnesium stearate, and calcium stearate; and 0.1 to 3 parts by weight of at least one antioxidant selected from the group of materials consisting of phosphorus-based antioxidants and phenol-based antioxidants.

[0008] Preferably, the additives include 0.1 to 3 parts by weight of the lubricant, which is at least one selected from the group of materials consisting of fatty acid-based lubricants, stearic acid-based lubricants, ester-based lubricants, fatty acid amide-based lubricants, and organosilicon-based lubricants; 1 to 5 parts by weight of the flame retardant, which is at least one selected from the group of materials consisting of antimony trioxide, phosphate ester, zinc borate, aluminum hydroxide, magnesium hydroxide, and chlorinated paraffin; and 0.1 to 3 parts by weight of the processing aid, which is at least one selected from the group of materials consisting of polyethylene wax, acrylic acid copolymer, and ultraviolet absorber.

[0009] In order to solve the above technical problems, another technical means adopted by the present invention provides a method for producing insulating plastic particles. The method for producing insulating plastic particles includes a preheating step of preheating 90 to 110 parts by weight of polyvinyl chloride (PVC) powder having an average degree of polymerization of 1,100 to 1,400 at a temperature of 75°C to 85°C for 30 to 35 minutes, a kneading step of kneading 2 to 8 parts by weight of a calcium zinc stabilizer and 0.1 to 20 parts by weight of an additive in a twin-screw kneader for 10 to 15 minutes continuously, adding a plasticizer and adding the preheated polyvinyl chloride (PVC) powder in batches at intervals of 10 to 15 minutes, then further adding 10 to 20 parts by weight of a calcium-containing filler having an average particle size of 1 μm to 2 μm and continuing mixing for 25 to 30 minutes to obtain a mixed material, and a granulation step of granulating the mixed material in a Banbury mixer to form insulating plastic particles, wherein in the kneading step, the calcium-containing filler is mixed with calcium carbonate powder and sintered calcium carbonate. the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder:calcium carbonate powder) is 1:2 to 2:1, the weight ratio of the content of the calcium zinc stabilizer to the content of the calcium-containing filler (calcium zinc stabilizer:calcium-containing filler) is 1:4 to 1:7.5, the additive is at least one selected from a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid, the insulating plastic particles form a cable insulation layer by extrusion molding, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed in water at 90°C for 14 days, and the capacitance value decreases by less than 10% compared to when the cable is immersed in water at 90°C for 7 days. [Effects of the Invention]

[0010] One of the advantageous effects of the present invention is that the insulating plastic particles and the manufacturing method thereof according to the present invention have the technical features that "the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder: calcium carbonate powder) is 1:2 to 2:1" and "the weight ratio of the content of the calcium zinc stabilizer to the content of the calcium-containing filler (calcium zinc stabilizer: calcium-containing filler) is 1:4 to 1:7.5", which effectively solves the problem that when a cable covered with a cable insulation layer made from existing polyvinyl chloride (PVC) plastic particles is immersed in water, the capacitance value tends to become unstable. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a flowchart of a method for producing insulating plastic particles according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] To better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the drawings, which are provided for reference and explanation only and do not limit the scope of the present invention.

[0013] The following describes the implementation of the "insulating plastic particles and manufacturing method thereof" according to the present invention through certain specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention based on the content disclosed herein. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details herein based on different perspectives and applications without departing from the concept of the present invention. Also, as mentioned in advance, the accompanying drawings of the present invention are for simple schematic illustrations and are not drawn to actual size. The technical content of the present invention will be described in more detail based on the following implementations, but the scope of protection of the present invention is not limited by the disclosed content.

[0014] It should be understood that although the present specification may use terms such as "first," "second," and "third" to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another element or one signal from another. Furthermore, the term "or" used in the present specification may include any one or more combinations of the associated listed items, depending on the actual situation.

[0015] [Insulating plastic particles] An embodiment of the present invention provides insulating plastic particles. The insulating plastic particles are obtained by kneading and granulating polyvinyl chloride (PVC) powder, a calcium-containing filler, a calcium-zinc stabilizer, a plasticizer, and additives, but the present invention is not limited thereto. The insulating plastic particles are extruded to form a cable insulation layer, and the capacitance value of a cable covered with the cable insulation layer does not decrease significantly when immersed in hot water.

[0016] The insulating plastic particles contain 90 to 110 parts by weight of polyvinyl chloride (PVC) powder, 10 to 20 parts by weight of calcium-containing filler, 2 to 8 parts by weight of calcium-zinc stabilizer, 30 to 50 parts by weight of plasticizer, and 0.1 to 20 parts by weight of additive.

[0017] Preferably, the insulating plastic particles contain 95 to 105 parts by weight of polyvinyl chloride (PVC) powder, 15 to 20 parts by weight of calcium-containing filler, 2 to 5 parts by weight of calcium zinc stabilizer, 35 to 45 parts by weight of plasticizer, and 6 to 10 parts by weight of additive.

[0018] The polyvinyl chloride (PVC) powder has an average degree of polymerization of 1,100 to 1,400. It is worth noting that polyvinyl chloride (PVC) powders with different average degrees of polymerization have significantly different properties and can be applied in different fields. In other words, since the insulating plastic particles of the present invention are mainly used to produce the cable insulation layer, the polyvinyl chloride (PVC) powder must have an average degree of polymerization of 1,100 to 1,400. On the other hand, other polyvinyl chloride (PVC) resins with an average degree of polymerization outside the range of 1,100 to 1,400 are not included in the scope of the polyvinyl chloride (PVC) powder of the present invention. Preferably, the average degree of polymerization of the polyvinyl chloride (PVC) powder is 1,200 to 1,300, but the present invention is not limited thereto.

[0019] The calcium-containing filler may have an average particle size of 1 μm to 2 μm and a moisture content of 0.5% or less, although the present invention is not limited thereto. The calcium-containing filler contains calcium carbonate powder and calcined kaolin powder, and the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder:calcium carbonate powder) is 1:2 to 2:1. In one embodiment, the content of the calcium carbonate powder in the calcium-containing filler is 1 part by weight to 5 parts by weight, and the content of the calcined kaolin powder is 10 parts by weight to 15 parts by weight.

[0020] It should be noted that the calcined kaolin powder in the calcium-containing filler is mainly used to improve the capacitance of the insulating plastic particles. Furthermore, when the cable insulation layer made of the insulating plastic particles is immersed in water, cracks may occur in the cable insulation layer due to the vibration of the water. However, since the calcium carbonate powder in the calcium-containing filler has a relatively small average particle size (e.g., 1 μm to 2 μm), the calcium carbonate powder has excellent dispersibility and fills the cracks, preventing the properties of the cable insulation layer from being affected by cracks.

[0021] The weight ratio of the calcium zinc stabilizer content to the calcium-containing filler content (calcium zinc stabilizer:calcium-containing filler) is 1:4 to 1:7.5. Preferably, the weight ratio of the calcium zinc stabilizer content to the calcium-containing filler content (calcium zinc stabilizer:calcium-containing filler) is 1:5 to 1:6. It is noteworthy that in the present invention, the capacitance stability of the cable insulation layer can be improved by adjusting the weight ratio of the calcium zinc stabilizer content to the calcium-containing filler content. Furthermore, the calcium zinc stabilizer may be, for example, a zinc calcium stabilizer (product number: CW-354) manufactured by Nanya Plastics, but the present invention is not limited thereto.

[0022] The plasticizer is at least one selected from the group of materials consisting of triisooctyl trimellitate (TOTM), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) adipate (DOA), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP).

[0023] The additive is at least one selected from a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid.

[0024] The additive may include 0.1 to 3 parts by weight of the heat stabilizer, and the heat stabilizer may be at least one selected from the group consisting of a barium cadmium heat stabilizer, a calcium zinc heat stabilizer, and a tin heat stabilizer.

[0025] The additive may include 0.1 to 3 parts by weight of the stearic acid, and the stearic acid may be at least one selected from the group consisting of zinc stearate, barium stearate, magnesium stearate, and calcium stearate.

[0026] The additive may include 0.1 to 3 parts by weight of the antioxidant, and the antioxidant may be at least one selected from the group of materials consisting of phosphorus-based antioxidants and phenol-based antioxidants.

[0027] The additive may contain 0.1 to 3 parts by weight of the lubricant, and the lubricant may be at least one selected from the group consisting of fatty acid-based lubricants, stearic acid-based lubricants, ester-based lubricants, fatty acid amide-based lubricants, and organosilicon-based lubricants.

[0028] The additive may contain 1 to 5 parts by weight of the flame retardant, and the flame retardant may be at least one selected from the group consisting of antimony trioxide, phosphate ester, zinc borate, aluminum hydroxide, magnesium hydroxide, and chlorinated paraffin.

[0029] The additive may include 0.1 to 3 parts by weight of the processing aid, and the processing aid may be at least one selected from polyethylene wax, acrylic acid copolymer, and ultraviolet absorber.

[0030] The insulating plastic particles are extrusion-molded to form a cable insulation layer, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed for 1 day, and the capacitance value decreases by less than 10% compared to when the cable is immersed for 7 days. Preferably, when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 6% to 10% compared to when the cable is immersed for 1 day, and the capacitance value decreases by 3.5% to 8% compared to when the cable is immersed for 7 days. The cable insulation layer also meets the UL94-V-0 flame retardancy standard.

[0031] [Method of manufacturing insulating plastic particles] In an embodiment of the present invention, a method for manufacturing insulating plastic particles is further provided. The insulating plastic particles may be manufactured by the method for manufacturing insulating plastic particles, but the present invention is not limited thereto.

[0032] The method for producing insulating plastic particles includes at least a preheating step S110, a kneading step S120, and a granulation step S130. The method for producing insulating plastic particles may further include other steps as necessary, and the present invention is not limited thereto.

[0033] In the preheating step S110, 90 to 110 parts by weight of polyvinyl chloride (PVC) powder is preheated for 30 to 35 minutes at a temperature of 75 to 85° C. The polyvinyl chloride (PVC) powder has an average degree of polymerization of 1,100 to 1,400.

[0034] In the kneading step S120, 2 to 8 parts by weight of calcium-zinc stabilizer and 0.1 to 20 parts by weight of additives are kneaded continuously for 10 to 15 minutes in a twin-screw kneader, and then the polyvinyl chloride (PVC) powder that has been preheated in batches and to which a plasticizer has been added is added. Next, 10 to 20 parts by weight of calcium-containing filler is further added and mixed continuously for 25 to 30 minutes to obtain a mixed material. Depending on the addition order of each component and the kneading time in the kneading step S120, the properties of the mixed material can be relatively stable.

[0035] The additive is at least one selected from the group consisting of a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid. The polyvinyl chloride (PVC) powder is added in batches at intervals of 10 to 15 minutes.

[0036] In the granulation step S130, the mixed material is granulated in a Banbury mixer to form insulating plastic particles.

[0037] The calcium-containing filler has an average particle size of 1 μm to 2 μm. The calcium-containing filler includes calcium carbonate powder and calcined kaolin powder, and the weight ratio of the calcined kaolin powder content to the calcium carbonate powder content is 1:2 to 2:1. The weight ratio of the calcium-zinc stabilizer content to the calcium-containing filler content is 1:4 to 1:7.5.

[0038] In one embodiment, the calcium-containing filler contains 1 to 5 parts by weight of calcium carbonate powder and 10 to 15 parts by weight of calcined kaolin powder, but the present invention is not limited thereto.

[0039] The plasticizer is at least one selected from the group of materials consisting of triisooctyl trimellitate (TOTM), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) adipate (DOA), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP).

[0040] The additive is at least one selected from a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid.

[0041] The additive may include 0.1 to 3 parts by weight of the heat stabilizer, and the heat stabilizer may be at least one selected from the group consisting of a barium cadmium heat stabilizer, a calcium zinc heat stabilizer, and a tin heat stabilizer.

[0042] The additive may include 0.1 to 3 parts by weight of the stearic acid, and the stearic acid may be at least one selected from the group consisting of zinc stearate, barium stearate, magnesium stearate, and calcium stearate.

[0043] The additive may include 0.1 to 3 parts by weight of the antioxidant, and the antioxidant may be at least one selected from the group of materials consisting of phosphorus-based antioxidants and phenol-based antioxidants.

[0044] The additive may contain 0.1 to 3 parts by weight of the lubricant, and the lubricant may be at least one selected from the group consisting of fatty acid-based lubricants, stearic acid-based lubricants, ester-based lubricants, fatty acid amide-based lubricants, and organosilicon-based lubricants.

[0045] The additive may contain 1 to 5 parts by weight of the flame retardant, and the flame retardant may be at least one selected from the group consisting of antimony trioxide, phosphate ester, zinc borate, aluminum hydroxide, magnesium hydroxide, and chlorinated paraffin.

[0046] The additive may include 0.1 to 3 parts by weight of the processing aid, and the processing aid may be at least one selected from polyethylene wax, acrylic acid copolymer, and ultraviolet absorber.

[0047] The insulating plastic particles are extrusion-molded to form a cable insulation layer, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed for 1 day, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by less than 10% compared to when the cable is immersed for 7 days.

[0048] [Measurement of experimental data] The compounding ratio of each component of the insulating plastic particles of Examples 1 to 3 and Comparative Examples 1 to 7, the capacitance value reduction rate, specific gravity, hardness (shore A), tensile strength, and elongation rate are as shown in the following Tables 1 and 2. The measurement methods for these will be described later.

[0049] Measurement of capacitance reduction rate: A cable covered with a cable insulation layer was immersed in hot water at 90°C, and its capacitance was measured based on the immersion time. The reduction rate of capacitance value when comparing immersion for 14 days with immersion for 1 day = (capacitance value when cable insulation layer is immersed for 14 days - capacitance value when cable insulation layer is immersed for 1 day) / capacitance value when cable insulation layer is immersed for 1 day. In addition, the reduction rate of capacitance value when comparing immersion for 14 days with immersion for 7 days = (capacitance value when cable insulation layer is immersed for 14 days - capacitance value when cable insulation layer is immersed for 7 days) / capacitance value when cable insulation layer is immersed for 7 days.

[0050] Measurement of specific gravity: Measured according to ASTM D-792.

[0051] Measurement of hardness (shore A): Measured based on ASTM D-2240.

[0052] Measurement of tensile strength: Measured according to ASTM D-638.

[0053] Elongation measurement: Measured based on ASTM D-638.

[0054] [Measurement results of blending ratios of components and physicochemical properties of examples and comparative examples] [Table 1]

[0055] [Comparative Example: Mixing ratio of components and measurement results of physicochemical properties] [Table 2]

[0056] [Consideration of measurement results] As can be seen from Examples 1 to 3, the weight ratio of the calcined kaolin powder content to the calcium carbonate powder content is 2:1 to 1:2, and the cable insulation layer made of the insulating plastic particles has a relatively low capacitance reduction rate, a specific gravity of 1.328 to 1.352, a hardness of 93 to 95, and a viscosity of 226.71 kg / cm 2 ~251.67kg / cm 2 and elongation of 245.69% to 292.92%.

[0057] In Comparative Example 1, the filler contained only calcined kaolin powder without calcium carbonate powder, so the reduction rate of the capacitance value of the cable insulation layer was too large and the hardness was insufficient.In Comparative Examples 2 and 3, the particle size of the filler was too large, so the reduction rate of the capacitance value of the cable insulation layer was too high.

[0058] In Comparative Examples 4 and 5, the stabilizer components were a magnesium aluminum stabilizer and a liquid calcium zinc stabilizer, respectively, and the results were inferior to those of the powder calcium zinc stabilizer, resulting in a large decrease in the capacitance value of the cable insulation layer.In Comparative Examples 6 and 7, the filler size and ratio caused uneven distribution of the filler, which led to partial expansion of the cable insulation layer and an increase in the capacitance value of the cable covered with the cable insulation layer.

[0059] [Advantageous Effects of the Embodiments] One of the advantageous effects of the present invention is that the insulating plastic particles and the manufacturing method thereof according to the present invention have the technical features that "the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder: calcium carbonate powder) is 1:2 to 2:1" and "the weight ratio of the content of the calcium zinc stabilizer to the content of the calcium-containing filler (calcium zinc stabilizer: calcium-containing filler) is 1:4 to 1:7.5", which effectively solves the problem that when a cable covered with a cable insulation layer made from existing polyvinyl chloride (PVC) plastic particles is immersed in water, the capacitance value tends to become unstable.

[0060] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, any equivalent technical modifications made using the specification and drawings of the present invention are included in the scope of the claims of the present invention. [Explanation of symbols]

[0061] S110...Preheating process S120...Kneading process S130...granulation process

Claims

1. 90 to 110 parts by weight of polyvinyl chloride (PVC) powder having an average degree of polymerization of 1,100 to 1,400; 10 to 20 parts by weight of a calcium-containing filler having an average particle size of 1 μm to 2 μm; 2 parts by weight to 8 parts by weight of a calcium zinc stabilizer; 30 to 50 parts by weight of a plasticizer; 0.1 to 20 parts by weight of an additive which is at least one selected from a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid; the calcium-containing filler comprises calcium carbonate powder and calcined kaolin powder, and the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder:calcium carbonate powder) is 1:2 to 2:1; the weight ratio of the content of the calcium zinc stabilizer to the content of the calcium-containing filler (calcium zinc stabilizer:calcium-containing filler) is 1:4 to 1:7.5; The insulating plastic particles are formed into a cable insulation layer by extrusion molding, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed for 1 day, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by less than 10% compared to when the cable is immersed for 7 days.

2. 2. The insulating plastic particles according to claim 1, wherein the calcium carbonate powder content in the calcium-containing filler is 1 to 5 parts by weight, and the calcined kaolin powder content is 10 to 15 parts by weight.

3. 2. The insulating plastic particles of claim 1, wherein the plasticizer is at least one selected from the group of materials consisting of triisooctyl trimellitate (TOTM), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) adipate (DOA), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP).

4. The additive is 0.1 to 3 parts by weight of at least one heat stabilizer selected from the group consisting of barium cadmium heat stabilizers, calcium zinc heat stabilizers, and tin heat stabilizers; 0.1 to 3 parts by weight of stearic acid, which is at least one selected from the group consisting of zinc stearate, barium stearate, magnesium stearate, and calcium stearate; 2. The insulating plastic particles according to claim 1, further comprising 0.1 to 3 parts by weight of an antioxidant which is at least one selected from the group consisting of phosphorus-based antioxidants and phenol-based antioxidants.

5. The additive is 0.1 to 3 parts by weight of at least one lubricant selected from the group consisting of fatty acid-based lubricants, stearic acid-based lubricants, ester-based lubricants, fatty acid amide-based lubricants, and organosilicon-based lubricants; 1 to 5 parts by weight of the flame retardant, which is at least one selected from the group consisting of antimony trioxide, phosphate ester, zinc borate, aluminum hydroxide, magnesium hydroxide, and chlorinated paraffin; 2. The insulating plastic particles according to claim 1, further comprising 0.1 to 3 parts by weight of the processing aid, which is at least one selected from the group consisting of polyethylene wax, acrylic acid copolymer, and ultraviolet absorber.

6. a preheating step of preheating 90 to 110 parts by weight of polyvinyl chloride (PVC) powder having an average degree of polymerization of 1,100 to 1,400 at a temperature of 75°C to 85°C for 30 to 35 minutes; a kneading step in which 2 to 8 parts by weight of a calcium-zinc stabilizer and 0.1 to 20 parts by weight of an additive are kneaded continuously for 10 to 15 minutes in a twin-screw kneader, a plasticizer is added, and the polyvinyl chloride (PVC) powder preheated in batches is added at intervals of 10 to 15 minutes, and then 10 to 20 parts by weight of a calcium-containing filler having an average particle size of 1 μm to 2 μm is further added and mixed continuously for 25 to 30 minutes to obtain a mixed material; a granulation step of granulating the mixed material in a Banbury mixer to form insulating plastic particles, In the kneading step, the calcium-containing filler includes calcium carbonate powder and calcined kaolin powder, the weight ratio of the content of the calcined kaolin powder to the content of the calcium carbonate powder (calcined kaolin powder:calcium carbonate powder) is 1:2 to 2:1, the weight ratio of the content of the calcium-zinc stabilizer to the content of the calcium-containing filler (calcium-zinc stabilizer:calcium-containing filler) is 1:4 to 1:7.5, and the additive is at least one selected from a heat stabilizer, stearic acid, an antioxidant, a lubricant, a flame retardant, and a processing aid, A method for producing insulating plastic particles, characterized in that the insulating plastic particles form a cable insulation layer by extrusion molding, and when a cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by 10% or less compared to when the cable is immersed for 1 day, and when the cable covered with the cable insulation layer is immersed in water at 90°C for 14 days, the capacitance value decreases by less than 10% compared to when the cable is immersed for 7 days.

7. 7. The method for producing insulating plastic particles according to claim 6, wherein the content of the calcium carbonate powder in the calcium-containing filler is 1 to 5 parts by weight, and the content of the calcined kaolin powder is 10 to 15 parts by weight.

8. 7. The method for producing insulating plastic particles according to claim 6, wherein the plasticizer is at least one selected from the group consisting of triisooctyl trimellitate (TOTM), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) adipate (DOA), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP).

9. The additive is 0.1 to 3 parts by weight of at least one heat stabilizer selected from the group consisting of barium cadmium heat stabilizers, calcium zinc heat stabilizers, and tin heat stabilizers; 0.1 to 3 parts by weight of stearic acid, which is at least one selected from the group consisting of zinc stearate, barium stearate, magnesium stearate, and calcium stearate; 7. The method for producing insulating plastic particles according to claim 6, further comprising: 0.1 to 3 parts by weight of an antioxidant which is at least one selected from the group consisting of phosphorus-based antioxidants and phenol-based antioxidants.

10. The additive is 0.1 to 3 parts by weight of at least one lubricant selected from the group consisting of fatty acid-based lubricants, stearic acid-based lubricants, ester-based lubricants, fatty acid amide-based lubricants, and organosilicon-based lubricants; 1 to 5 parts by weight of the flame retardant, which is at least one selected from the group consisting of antimony trioxide, phosphate ester, zinc borate, aluminum hydroxide, magnesium hydroxide, and chlorinated paraffin; 7. The method for producing insulating plastic particles according to claim 6, further comprising: 0.1 to 3 parts by weight of the processing aid, which is at least one selected from the group consisting of polyethylene wax, acrylic acid copolymer, and ultraviolet absorber.

11. 7. Insulating plastic particles, characterized in that they are produced by the method for producing insulating plastic particles according to claim 6.

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