High-strength, ultra-high-temperature-resistant and ultra-low-temperature-resistant oil-resistant polyvinyl chloride flame-retardant sheath material and preparation method thereof

Abstract

The invention discloses a high-strength, ultra-high-temperature-resistant and ultra-low-temperature-resistant oil-resistant polyvinyl chloride flame-retardant sheath material and a preparation method thereof. The formula of the sheath material comprises the following components in parts by weight: 40-70 parts of PVC resin with the polymerization degree of 2500; 30 to 50 parts of PVC resin with a polymerization degree of 1300; 15 to 30 parts of ABS resin; 10-20 parts of powdered nitrile rubber; 30 to 50 parts of EVA resin; 40 to 70 parts of a Monocizer W-795 plasticizer; 5 to 10 parts of antimony trioxide; 8-12 parts of zinc borate; 20 to 40 parts of filler; 10-15 parts of a calcium-zinc heat stabilizer; 0.4 to 0.6 part of a lubricant; and 2-5 parts of a processing aid. PVC / ABS is used as a framework to provide material strength, EVA resin with high vinyl acetate content is added to increase cold resistance of the material, and EVA and nitrile rubber are used for synergistically improving oil resistance of the material. The device is suitable for rapid temperature difference change and high-oil environments.

Description

Technical Field

[0001] The invention relates to the field of polymer materials, and in particular to an oil-resistant polyvinyl chloride flame-retardant sheath material with high strength and resistance to ultrahigh and ultralow temperatures and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC) is one of the most widely used general-purpose plastics. It stands out among general-purpose plastics due to its excellent plasticity, recyclability and excellent mechanical properties. In addition, its flame retardancy, aging resistance and corrosion resistance are also among the best. Since the synthesis process of PVC is relatively simple, the raw materials are widely available and affordable, it is widely used in many fields.

[0003] The blends of PVC with ABS, nitrile rubber, EVA and other materials not only inherit the high flame retardancy and corrosion resistance of PVC, but also have the impact resistance and easy molding and processing characteristics of ABS resin. At the same time, by adding nitrile rubber and EVA, these blends also obtain the characteristics of oil resistance and cold resistance. This makes them particularly suitable for power transmission, electrical equipment wiring and control cables in extremely cold, extremely hot and oil-rich environments.

[0004] However, conventional PVC cable products have an obvious disadvantage: when the hardness decreases, the strength of the material will also decrease, and in high temperature environments, thermal deformation will increase sharply, thus affecting the appearance and service life of the cable. In order to solve this problem, the method of reducing the plasticizer content is usually adopted to increase the hardness of the product, thereby increasing strength and reducing thermal deformation. However, doing so will cause the cold resistance of the material to decrease, making the cable prone to brittle cracking in low temperature environments.

[0005] Therefore, developing a high-strength, ultra-high-temperature and low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material suitable for environments with drastic temperature changes and high oil content will have a great competitive advantage in the market. Summary of the invention

[0006] The purpose of the present invention is to provide a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material and a preparation method thereof.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A high-strength, ultra-high temperature and ultra-low temperature resistant, oil-resistant polyvinyl chloride flame-retardant sheath material, the raw materials of which include the following components in parts by mass:

[0009]

[0010]

[0011] According to a further technical solution, the ABS resin is one or a mixture of PA-747F, PA-747R, and HR-181.

[0012] According to a further technical solution, the acrylonitrile content of the powdered nitrile rubber is 26%, 33% or 40%.

[0013] According to a further technical solution, the vinyl acetate content of the EVA resin is 2%, 5% or 8%.

[0014] According to a further technical solution, the filler is one or a mixture of light calcium carbonate, porous powdered quartz, and activated heavy calcium carbonate.

[0015] According to a further technical solution, the lubricant is selected from at least one of stearic acid, polyethylene wax and polypropylene wax.

[0016] According to a further technical solution, the processing aid is selected from one or a mixture of two of polymethyl methacrylate, acrylate, styrene copolymer, and acrylic acid-modified polytetrafluoroethylene.

[0017] Furthermore, the present invention also discloses a method for preparing a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, comprising:

[0018] Step 1: Add PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer into a high-speed mixer and stir for 1 to 2 minutes at a speed of 450 to 500 r / min for pre-mixing;

[0019] Add calcium zinc heat stabilizer and mix at high speed for 2 to 4 minutes at a speed of 900 to 950 r / min;

[0020] Continue to add antimony trioxide, zinc borate, filler, lubricant, processing aid, and knead at high speed for 5 to 10 minutes at a speed of 900 to 950 r / min; stop when the temperature reaches 110 to 120°C, and add powdered nitrile rubber and EVA resin into the kneader when the material temperature drops to 90°C;

[0021] Continue stirring for 60 to 90 seconds until the mixture is fully stirred and evenly mixed before discharging at a speed of 450 to 500 r / min;

[0022] Step 2: Extruding the discharge material of step 1, during extrusion, the temperature of the twin-screw temperature zone is set to 140-170° C., and the screw speed is set to 220-300 r / min;

[0023] Step 3: using a single screw extruder for granulation, with an extrusion temperature of 100-130° C. and a rotation speed of 45-50 r / min, to obtain a pre-treated masterbatch of the high-strength and ultra-high-temperature-resistant and ultra-low-temperature-resistant oil-resistant polyvinyl chloride flame-retardant sheath material;

[0024] Step 4: Add the pretreated masterbatch obtained above and ABS resin into a high-speed mixer and stir for 1 to 2 minutes at a speed of 450 to 500 r / min for premixing, and discharge the mixture after it is fully stirred and uniformly mixed;

[0025] Step 5, extruding the discharge material of step 4, during extrusion, the temperature of the twin-screw temperature zone is set to 150-170° C., and the screw speed is set to 240-300 r / min;

[0026] Step six, using a single screw extruder for granulation, the extrusion temperature is 100-130° C., the rotation speed is 45-50 r / min, to obtain the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0027] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0028] The terms used herein generally have the ordinary meanings of each term used in the art, in the context of the present invention, and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present invention.

[0029] The working principle and advantages of the present invention are as follows:

[0030] 1. The raw materials of the present invention adopt a specific component formula. By adding EVA resin, the cold resistance of the material can be improved while maintaining the mechanical properties of the original material up to standard, ensuring that the cable will not crack or break in an extremely cold environment, thereby greatly improving the service life of the cable.

[0031] 2. The raw materials of the present invention adopt a specific component formula. By adding mixed powdered nitrile rubber and EVA resin, the strength of the material can be improved while the oil resistance of the material is improved while maintaining the mechanical properties of the original material, so that the cable can be used normally for a long time in a high temperature and high oil environment.

[0032] 3. The formula of the present invention utilizes the high temperature and low temperature resistant plasticizer Monocizer W-795, which can increase the working temperature of the finished wire and cable to 125°C, and can still maintain good mechanical strength after aging in a naturally ventilated oven at 150°C for 240h.

[0033] 4. The raw materials of the present invention adopt a specific component formula, and the raw materials except ABS resin are granulated first. Since the powdered nitrile rubber and EVA resin are easy to agglomerate and difficult to disperse, secondary plasticization can well reduce the risk of poor plasticization. The obtained masterbatch is then mixed with ABS resin for secondary granulation. On the basis of maintaining the mechanical properties of the original material up to standard, the strength of the material is improved, the low-temperature brittleness performance of the material can be improved, and the scratch resistance of the wire after being formed is greatly improved. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with embodiments:

[0035] The present invention will be described in detail below. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0036] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0037] Embodiment 1:

[0038] This embodiment 1 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0039] Polyvinyl chloride resin with polymerization degree 2500 50 servings Polyvinyl chloride resin with polymerization degree 1300 50 servings Acrylonitrile content 26% nitrile rubber 16 servings EVA resin with 2% vinyl acetate content 30 servings ABS resin HR-181 24 servings Antimony trioxide 6 servings Zinc borate 10 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 50 servings Stearic acid 0.6 parts Polymethyl methacrylate 4 servings Light calcium carbonate 22 servings

[0040] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0041] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0042] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0043] Embodiment 2:

[0044] This embodiment 2 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0045] Polyvinyl chloride resin with polymerization degree 2500 50 servings Polyvinyl chloride resin with polymerization degree 1300 50 servings Acrylonitrile content 33% nitrile rubber 16 servings EVA resin with 5% vinyl acetate content 30 servings ABS resin PA-747F 24 servings Antimony trioxide 6 servings Zinc borate 10 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 50 servings Polyethylene wax 0.6 parts Acrylate 3 servings Porous pink quartz 24 servings

[0046] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0047] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0048] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0049] Embodiment 3:

[0050] This embodiment 3 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0051] Polyvinyl chloride resin with polymerization degree 2500 50 servings Polyvinyl chloride resin with polymerization degree 1300 50 servings Acrylonitrile content 40% nitrile rubber 16 servings EVA resin with 8% vinyl acetate content 30 servings ABS resin PA-747R 24 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 50 servings Polyethylene wax 0.6 parts Acrylic modified polytetrafluoroethylene 3 servings Activated calcium carbonate heavy calcium 24 servings

[0052] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0053] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0054] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0055] Embodiment 4:

[0056] This embodiment 4 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0057] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 36 servings ABS resin PA-747F 24 servings Antimony trioxide 6 servings Zinc borate 10 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 50 servings Polypropylene wax 0.6 parts Polymethyl methacrylate 4 servings Light calcium carbonate 25 servings

[0058] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0059] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0060] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0061] Embodiment 5:

[0062] This embodiment 5 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0063] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 26% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 42 servings ABS resin PA-747F 30 servings Antimony trioxide 7 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 46 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 4 servings Activated calcium carbonate heavy calcium 22 servings

[0064] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0065] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0066] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0067] Embodiment 6:

[0068] This embodiment 6 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0069] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 40 servings ABS resin PA-747F 25 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 55 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 2 servings Light calcium carbonate 24 servings

[0070] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0071] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0072] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0073] Embodiment 7:

[0074] This embodiment 7 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0075]

[0076]

[0077] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0078] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0079] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0080] The materials obtained from the above 7 embodiments of the present invention were tested, and the material performance data were shown in Table 1:

[0081] Table 1

[0082]

[0083] Comparative Example 1:

[0084] This comparative example 1 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0085] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 40 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 44 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 3 servings Activated calcium carbonate heavy calcium 20 servings

[0086] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0087] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are fed to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0088] Comparative Example 2:

[0089] This comparative example 2 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0090] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 60 servings ABS resin PA-747F 28 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 52 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 3 servings Activated calcium carbonate heavy calcium 20 servings

[0091] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0092] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0093] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0094] Comparative Example 3:

[0095] This comparative example 3 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0096] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 12 servings EVA resin with 8% vinyl acetate content 40 servings ABS resin PA-747F 28 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings TOTM Plasticizer 50 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 3 servings Activated calcium carbonate heavy calcium 20 servings

[0097] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0098] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and TOTM plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes. Antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly mixed, the materials are discharged, and then the materials are fed to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0099] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0100] Comparative Example 4:

[0101] This comparative example 4 provides a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, the specific formula is as follows:

[0102] Polyvinyl chloride resin with degree of polymerization 2500 66 copies Polyvinyl chloride resin with polymerization degree 1300 33 servings Acrylonitrile content 33% nitrile rubber 25 servings EVA resin with 8% vinyl acetate content 40 servings ABS resin PA-747F 28 servings Antimony trioxide 6 servings Zinc borate 8 servings KaiMiSen PKD2290 12 servings Monocizer W-795 Plasticizer 50 servings Polyethylene wax 0.6 parts Polymethyl methacrylate 3 servings Activated calcium carbonate heavy calcium 20 servings

[0103] The preparation method of the above-mentioned high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is as follows:

[0104] PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer are added to a high-speed mixer and stirred for 1 to 2 minutes for pre-mixing, and then calcium zinc heat stabilizer is added, and high-speed mixing is continued for 2 to 4 minutes, and antimony trioxide, zinc borate, fillers, lubricants, and processing aids are continuously added, and high-speed kneading is continued for 5 to 10 minutes. When the temperature reaches 110 to 120° C., the mixture is stopped, and when the material temperature drops to 90° C., powdered nitrile rubber and EVA resin are added to the kneader, and stirring is continued for 60 to 90 seconds. After the mixed materials are fully stirred and uniformly, the materials are discharged, and then the materials are added to a twin-screw extruder, the temperature is set at 170° C., and then granulated with a single-screw extruder to obtain the pre-treated masterbatch of the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0105] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1 to 2 minutes for premixing. After the mixed materials are fully stirred and uniformly mixed, they are discharged and fed into a twin-screw extruder with a set temperature of 160°C. Then, granulation is performed using a single-screw extruder to obtain the high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

[0106] The materials obtained from the four comparative examples were tested, and the material performance data were shown in Table 2:

[0107] Table 2

[0108]

[0109] By screening and optimizing PVC resin, ABS resin, EVA resin, powdered nitrile rubber and other components and formulas with a polymerization degree of 1300 and a polymerization degree of 2500, a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material is prepared. As shown in Table 1 and Table 2, the results of Examples 1 to 7 and Comparative Examples 1 to 4 show that the performance of the polyvinyl chloride sheath material prepared by the method of the present invention changes with the selection of different proportions of ABS resin, EVA resin and powdered nitrile rubber components. When ABS resin PA-747F is used for modification, the strength of the material is significantly improved, and when the addition amount of ABS resin is 0, the strength of the material decreases sharply. When EVA resin with a vinyl acetate content of 8% and nitrile rubber with acrylonitrile content of 33% are added, the oil resistance and cold resistance of the material are also significantly improved. When the addition amount of EVA resin with a vinyl acetate content of 8% is too large, the strength of the material will also decrease accordingly, and when the addition amount of nitrile rubber with acrylonitrile content of 33% is too large, the aging performance of the material will decrease year-on-year. When the Monocizer W-795 plasticizer is replaced with the TOTM plasticizer, the aging performance and low temperature resistance of the material will drop sharply. At the same time, the PVC resin with a polymerization degree of 2500 can also increase the strength and cold resistance of the material to a certain extent, but the processing performance of high polymerization degree PVC is poor, so it needs to be used in conjunction with the PVC resin with a polymerization degree of 1300.

[0110] In summary, it can be seen from Tables 1 and 2 that the test results in Example 7 not only show excellent material strength, elongation, electrical properties, and cold resistance, but also the retention rate data of tensile strength and elongation at break measured by air aging and 902# oil aging are better than other cases.

[0111] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength, ultra-high temperature and ultra-low temperature resistant, oil-resistant polyvinyl chloride flame-retardant sheath material, characterized in that: The raw materials include the following components by mass:

2. The high-strength, ultra-high-temperature and ultra-low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1 is characterized in that: The ABS resin is one of PA-747F, PA-747R, and HR-181, or a mixture of several of them.

3. The high-strength, ultra-high-temperature and ultra-low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1 is characterized in that: The acrylonitrile content of the powdered nitrile rubber is 26%, 33% or 40%.

4. The high-strength, ultra-high-temperature and ultra-low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1 is characterized in that: The vinyl acetate content of the EVA resin is 2%, 5% or 8%.

5. The high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1 is characterized in that: The filler is one or a mixture of light calcium carbonate, porous powdered quartz, and activated heavy calcium carbonate.

6. The high-strength, ultra-high-temperature and ultra-low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1, characterized in that: The lubricant is selected from at least one of stearic acid, polyethylene wax and polypropylene wax.

7. The high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material according to claim 1, characterized in that: The processing aid is selected from one or a mixture of two of polymethyl methacrylate, acrylate, styrene copolymer, and acrylic acid-modified polytetrafluoroethylene.

8. A method for preparing a high-strength, ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material, characterized in that: Used for preparing the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame-retardant sheath material as claimed in any one of claims 1 to 7, the preparation method comprises: Step 1: Add PVC resin with a degree of polymerization of 1300, PVC resin with a degree of polymerization of 2500, and Monocizer W-795 plasticizer into a high-speed mixer and stir for 1 to 2 minutes at a speed of 450 to 500 r / min for pre-mixing; Add calcium zinc heat stabilizer and mix at high speed for 2 to 4 minutes at a speed of 900 to 950 r / min; Continue to add antimony trioxide, zinc borate, filler, lubricant, processing aid, and knead at high speed for 5 to 10 minutes at a speed of 900 to 950 r / min; stop when the temperature reaches 110 to 120°C, and add powdered nitrile rubber and EVA resin into the kneader when the material temperature drops to 90°C; Continue stirring for 60 to 90 seconds until the mixture is fully stirred and evenly mixed before discharging at a speed of 450 to 500 r / min; Step 2: Extruding the discharge material of step 1, during extrusion, the temperature of the twin-screw temperature zone is set to 140-170° C., and the screw speed is set to 220-300 r / min; Step 3: using a single screw extruder for granulation, with an extrusion temperature of 100-130° C. and a rotation speed of 45-50 r / min, to obtain a pre-treated masterbatch of the high-strength and ultra-high-temperature-resistant and ultra-low-temperature-resistant oil-resistant polyvinyl chloride flame-retardant sheath material; Step 4: Add the pretreated masterbatch obtained above and ABS resin into a high-speed mixer and stir for 1 to 2 minutes at a speed of 450 to 500 r / min for premixing, and discharge the mixture after it is fully stirred and uniformly mixed; Step 5, extruding the discharge material of step 4, during extrusion, the temperature of the twin-screw temperature zone is set to 150-170° C., and the screw speed is set to 240-300 r / min; Step six, using a single screw extruder for granulation, the extrusion temperature is 100-130° C., the rotation speed is 45-50 r / min, to obtain the high-strength and ultra-high temperature and ultra-low temperature resistant oil-resistant polyvinyl chloride flame retardant sheath material.

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