High-strength and super-high-temperature and super-low-temperature resistant oil-resistant polyvinyl chloride flame-retardant sheathing material and preparation method thereof

Abstract

The application discloses a kind of high-strength and superhigh temperature and superlow temperature resistant oil-resistant PVC flame-retardant sheathing material and preparation method thereof, and the formula of sheathing material includes: the PVC resin of 40~70 parts of polymerization degree 2500;The PVC resin of 30~50 parts of polymerization degree 1300;ABS resin 15~30 parts;Powder nitrile rubber 10~20 parts;EVA resin 30~50 parts;Monocizer W-795 plasticizer 40~70 parts;Antimony trioxide 5~10 parts;Zinc borate 8~12 parts;Filler 20~40 parts;Calcium-zinc heat stabilizer 10~15 parts;Lubricant 0.4~0.6 parts;Processing aid 2~5 parts.The application uses PVC / ABS as skeleton to provide material strength, then adds high vinyl acetate content EVA resin to increase the cold resistance of material, and the oil resistance of material is improved by EVA and nitrile rubber.It is suitable for sharp temperature difference change and high oil environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high molecular materials, in particular to a high-strength and super-high-temperature-resistant and super-low-temperature-resistant oil-resistant PVC flame-retardant sheath material and a preparation method thereof. BACKGROUND

[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, renewability, and excellent mechanical properties. In addition, its flame retardancy, aging resistance, and corrosion resistance are also among the best. Because of the relatively simple synthesis process of PVC, the wide range of raw materials and affordable price, it is widely used in many fields.

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

[0004] However, conventional PVC cable products have a significant disadvantage: when the hardness decreases, the strength of the material will also decrease, and in high temperature environments, thermal deformation will increase sharply, affecting the appearance and service life of the cable. In order to solve this problem, the method of reducing the content of plasticizer is usually used to increase the hardness of the product, thereby increasing the strength and reducing the thermal deformation. But 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, the development of a high-strength and super-high-temperature-resistant and super-low-temperature-resistant oil-resistant PVC flame-retardant sheath material suitable for environments with sharp temperature changes and high oil will have a strong competitive advantage in the market. SUMMARY

[0006] The purpose of the present application is to provide a high-strength and super-high-temperature-resistant and super-low-temperature-resistant oil-resistant PVC flame-retardant sheath material and a preparation method thereof.

[0007] To achieve the above purpose, the technical solution adopted by the present application is:

[0008] A high-strength and super-high-temperature-resistant and super-low-temperature-resistant oil-resistant PVC flame-retardant sheath material, the raw materials of which include the following components in mass fraction:

[0009]

[0010]

[0011] Further technical solutions, the ABS resin is one or a mixture of several of PA-747F, PA-747R, HR-181.

[0012] Further technical solutions, the acrylonitrile content of the powdered nitrile rubber is 26% or 33% or 40%.

[0013] Further technical solutions, the ethylene vinyl acetate content of the EVA resin is 2% or 5% or 8%.

[0014] Further technical solutions, the filler is a mixture of one or several of calcium carbonate light calcium, porous powder quartz, active calcium carbonate heavy calcium.

[0015] Further technical solutions, the lubricant is selected from at least one of stearic acid, polyethylene wax, polypropylene wax.

[0016] Further technical solutions, the processing aid is selected from one or a mixture of two of polymethyl methacrylate, acrylic ester, styrene copolymer, polytetrafluoroethylene modified by acrylic acid.

[0017] Further, the application also discloses a preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheathing material.

[0018] Step one, the PVC resin with a polymerization degree of 1300, the PVC resin with a polymerization degree of 2500, the Monocizer W-795 plasticizer are added into a high-speed mixer and stirred for 1-2 minutes at a rotating speed of 450-500 r / min, and pre-mixed;

[0019] The calcium-zinc heat stabilizer is put in, and high-speed mixing is carried out for 2-4 minutes at a rotating speed of 900-950 r / min;

[0020] The diantimony trioxide, the zinc borate, the filler, the lubricant and the processing aid are continuously put in, and high-speed kneading is carried out for 5-10 minutes at a rotating speed of 900-950 r / min; when the temperature reaches 110-120 DEG C, the process is stopped, and when the material temperature drops to 90 DEG C, the powdered nitrile rubber and the EVA resin are put into the kneader;

[0021] The stirring is continuously carried out for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly distributed at a rotating speed of 450-500 r / min;

[0022] Step two, the material discharged in step one is extruded, and when extruding, the temperature of the double-screw temperature zone is set to 140-170 DEG C, and the rotating speed of the screw is set to 220-300 r / min;

[0023] Step three, using a single screw extruder granulation, the extrusion temperature is 100-130 DEG C, the speed is 45-50r / min, obtain the high strength and super high temperature and super low temperature resistant oil resistant PVC flame retardant sheath material pretreatment masterbatch;

[0024] Step four, the pretreatment masterbatch obtained above and ABS resin are added into a high mixer and stirred for 1-2 minutes, the speed is 450-500r / min, pre-mixed, after the mixture is fully stirred and uniform, the material is discharged;

[0025] Step five, the discharge of step four is extruded, when extruding, the temperature of the double screw temperature zone is set to 150-170 DEG C, the screw speed is set to 240-300r / min;

[0026] Step six, using a single screw extruder granulation, the extrusion temperature is 100-130 DEG C, the speed is 45-50r / min, obtain the high strength and super high temperature and super low temperature resistant oil resistant PVC flame retardant sheath material.

[0027] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or variants thereof are open-ended, meaning that they do not exclude additional elements or steps.

[0028] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having" or variants thereof are open-ended, meaning that they do not exclude additional elements or steps.

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

[0030] 1. The raw materials of the present application adopt a specific component formula, by adding EVA resin, the cold resistance of the material is improved on the basis of meeting the mechanical performance of the original material, the cable is not cracked and broken in extremely cold environment, and the service life of the cable is greatly improved.

[0031] 2. The raw materials of the present application adopt a specific component formula, by adding mixed powder nitrile rubber and EVA resin, the strength of the material is improved on the basis of meeting the mechanical performance of the original material, and the oil resistance of the material is improved, so that the cable can be used normally for a long time in high temperature and high oil environment.

[0032] 3. The formula of the present application uses high temperature resistant and low temperature resistant plasticizer Monocizer W-795, which can improve the working temperature of the finished wire and cable to 125 DEG C, and still maintain good mechanical strength after oven aging at 150 DEG C for 240h under natural ventilation.

[0033] 4. The raw material of the present application uses a specific component formula. The raw materials except ABS resin are granulated in advance. Due to the characteristics of powder nitrile rubber and EVA resin that are easy to agglomerate and difficult to disperse, secondary plasticization can well reduce the risk of poor plasticization. The obtained masterbatch is mixed with ABS resin for secondary granulation, which can improve the strength of the material and improve the low-temperature embrittlement performance of the material while maintaining the mechanical performance of the original material up to standard, and greatly improve the scratch resistance of the finished wire. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with examples:

[0035] The present application will be further described below in conjunction with examples:

[0036] The language used in this document is only for describing specific embodiments and is not intended to limit the present application. The singular forms such as "a", "this", "this", "this" and "the" also include the plural forms as used herein.

[0037] Example 1:

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

[0039] Polyvinyl chloride resin with degree of polymerization 2500 50 parts Polyvinyl chloride resin with degree of polymerization 1300 50 parts Acrylonitrile content 26% nitrile rubber 16 parts Vinyl acetate content 2% EVA resin 30 parts ABS resin HR-181 24 parts Antimony trioxide 6 parts Zinc borate 10 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 50 parts Stearic acid 0.6 parts Polymethyl methacrylate 4 parts Light calcium carbonate 22 parts

[0040] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0041] PVC resin with a polymerization degree of 1300, PVC resin with a polymerization degree of 2500, Monocizer W-795 plasticizer, are added to a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and high-speed mixing is continued for 2-4 minutes, then antimony trioxide, zinc borate, filler, lubricant, processing aid are added, and high-speed kneading is continued for 5-10 minutes, then the temperature is stopped when it reaches 110-120℃, and when the material temperature drops to 90℃, powder nitrile rubber and EVA resin are added to the kneading machine, and stirring is continued for 60-90 seconds until the mixture is fully stirred and uniform, then the material is discharged and then fed to a double-screw extruder, and the temperature is set to 170℃, then a single-screw extruder is used for granulation, and the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is obtained.

[0042] The pretreated master batch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, the mixture is granulated by using a single screw extruder to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0043] Example 2

[0044] The example 2 provides a high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material, and the specific formula is as follows:

[0045] Polyvinyl chloride resin with degree of polymerization 2500 50 parts Polyvinyl chloride resin with degree of polymerization 1300 50 parts Acrylonitrile content 33% nitrile rubber 16 parts Vinyl acetate content 5% EVA resin 30 parts ABS resin PA-747F 24 parts Antimony trioxide 6 parts Zinc borate 10 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 50 parts Polyethylene wax 0.6 parts Acrylate 3 parts Porous powder quartz 24 parts

[0046] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0047] The PVC resin with a polymerization degree of 1300, the PVC resin with a polymerization degree of 2500, and the Monocizer W-795 plasticizer are added into a high mixer and stirred for 1-2 minutes for premixing. Then, the calcium-zinc heat stabilizer is fed in, and high-speed mixing is continued for 2-4 minutes. The antimony trioxide, zinc borate, filler, lubricant, and processing aid are continuously fed in, and high-speed kneading is continued for 5-10 minutes. When the temperature reaches 110-120°C, the stirring is stopped. When the material temperature drops to 90°C, the powdered nitrile rubber and EVA resin are fed into the kneader, and the stirring is continued for 60-90 seconds. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 170°C. Then, the mixture is granulated by using a single screw extruder to obtain the pretreated master batch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0048] The pretreated master batch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, the mixture is granulated by using a single screw extruder to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0049] Example 3

[0050] The example 3 provides a high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material, and the specific formula is as follows:

[0051] Polyvinyl chloride resin with degree of polymerization 2500 50 parts Polyvinyl chloride resin with degree of polymerization 1300 50 parts Acrylonitrile content 40% nitrile rubber 16 parts Vinyl acetate content 8% EVA resin 30 parts ABS resin PA-747R 24 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 50 parts Polyethylene wax 0.6 parts Acrylate modified polytetrafluoroethylene 3 parts Active calcium carbonate heavy calcium carbonate 24 parts

[0052] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0053] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, Monocizer W-795 plasticizer are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then Sb203, Zn(B03)2, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and the powder nitrile rubber and EVA resin are added into the kneader when the material temperature drops to 90°C, and the stirring is continuously carried out for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, so as to obtain the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0054] The pretreated masterbatch and ABS resin obtained above are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, and the mixture is fully stirred and uniformly mixed, and then the material is discharged, and then the material is added into a double-screw extruder, and the temperature is set to 160°C, and then a single-screw extruder is used for granulation, so as to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0055] Example 4

[0056] The high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is prepared according to the following specific formula:

[0057] Polyvinyl chloride resin with degree of polymerization 2500 66 parts Polyvinyl chloride resin with degree of polymerization 1300 33 parts Acrylonitrile content 33% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 36 parts ABS resin PA-747F 24 parts Antimony trioxide 6 parts Zinc borate 10 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 50 parts Polypropylene wax 0.6 parts Polymethyl methacrylate 4 parts Light calcium carbonate 25 parts

[0058] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0059] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, Monocizer W-795 plasticizer are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then Sb203, Zn(B03)2, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and the powder nitrile rubber and EVA resin are added into the kneader when the material temperature drops to 90°C, and the stirring is continuously carried out for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, so as to obtain the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0060] The pretreated master batch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, a single screw extruder is used for granulation to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0061] Example 5:

[0062] The example 5 provides a high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material, and the specific formula is as follows:

[0063] Polyvinyl chloride resin with degree of polymerization 2500 66 parts Polyvinyl chloride resin with degree of polymerization 1300 33 parts Acrylonitrile content 26% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 42 parts ABS resin PA-747F 30 parts Antimony trioxide 7 parts Zinc borate 8 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 46 parts Polyethylene wax 0.6 parts Polymethyl methacrylate 4 parts Active calcium carbonate heavy calcium carbonate 22 parts

[0064] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0065] The PVC resin with a polymerization degree of 1300, the PVC resin with a polymerization degree of 2500, and the Monocizer W-795 plasticizer are added into a high mixer and stirred for 1-2 minutes for premixing. Then, the calcium-zinc heat stabilizer is fed in, and high-speed mixing is continued for 2-4 minutes. The antimony trioxide, zinc borate, filler, lubricant, and processing aid are continuously fed in, and high-speed kneading is continued for 5-10 minutes. When the temperature reaches 110-120°C, the stirring is stopped. When the material temperature drops to 90°C, the powdered nitrile rubber and EVA resin are fed into the kneader, and stirring is continued for 60-90 seconds. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 170°C. Then, a single screw extruder is used for granulation to obtain the pretreated master batch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0066] The pretreated master batch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, a single screw extruder is used for granulation to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0067] Example 6:

[0068] The example 6 provides a high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material, and the specific formula is as follows:

[0069] Polyvinyl chloride resin with degree of polymerization 2500 66 parts Polyvinyl chloride resin with degree of polymerization 1300 33 parts Acrylonitrile content 33% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 40 parts ABS resin PA-747F 25 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 55 parts Polyethylene wax 0.6 parts Polymethyl methacrylate 2 parts Light calcium carbonate 24 parts

[0070] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0071] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, Monocizer W-795 plasticizer are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then Sb203, Zn(B03)2, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and the powder nitrile rubber and EVA resin are added into the kneader when the material temperature drops to 90°C, and the stirring is continuously carried out for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, so as to obtain the pretreatment master batch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0072] The pretreatment master batch and ABS resin obtained above are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, and the mixture is fully stirred and uniformly mixed, and then the material is discharged, and then the material is added into a double-screw extruder, and the temperature is set to 160°C, and then a single-screw extruder is used for granulation, so as to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0073] Example 7

[0074] The high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is prepared by the following method:

[0075]

[0076]

[0077] The high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is prepared by the following method:

[0078] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, Monocizer W-795 plasticizer are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then Sb203, Zn(B03)2, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and the powder nitrile rubber and EVA resin are added into the kneader when the material temperature drops to 90°C, and the stirring is continuously carried out for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, so as to obtain the pretreatment master batch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0079] The pretreated master batch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160℃. Then, the mixture is granulated by using a single screw extruder to obtain the high-strength, super-high-temperature and super-low-temperature resistant, oil-resistant PVC flame-retardant sheath material.

[0080] The materials obtained in the above seven examples of the application are tested, and the material performance data are shown in Table 1:

[0081] Table 1

[0082]

[0083] Comparative Example 1

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

[0085] Polyvinyl chloride resin with degree of polymerization 2500 66 parts Polyvinyl chloride resin with degree of polymerization 1300 33 parts Acrylonitrile content 33% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 40 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemison PKD 2290 12 parts Monocizer W-795 plasticizer 44 parts Polyethylene wax 0.6 parts Poly(methyl methacrylate) 3 parts Active calcium carbonate heavy calcium carbonate 20 parts

[0086] The preparation method of the high-strength, super-high-temperature and super-low-temperature resistant, oil-resistant PVC flame-retardant sheath material is as follows:

[0087] PVC resin with a polymerization degree of 1300, PVC resin with a polymerization degree of 2500, Monocizer W-795 plasticizer are added into a high mixer and stirred for 1-2 minutes for premixing. Then, calcium-zinc heat stabilizer is added, and high-speed mixing is continued for 2-4 minutes. Then, antimony trioxide, zinc borate, filler, lubricant and processing aid are continuously added, and high-speed kneading is continued for 5-10 minutes. When the temperature reaches 110-120℃, the stirring is stopped. When the temperature of the mixture decreases to 90℃, powdered nitrile rubber and EVA resin are added into the kneader, and stirring is continued for 60-90 seconds. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 170℃. Then, the mixture is granulated by using a single screw extruder to obtain the high-strength, super-high-temperature and super-low-temperature resistant, oil-resistant PVC flame-retardant sheath material.

[0088] Comparative Example 2

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

[0090] Polyvinyl chloride resin with a degree of polymerization of 2500 66 parts Polyvinyl chloride resin with a degree of polymerization of 1300 33 parts Acrylonitrile content 33% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 60 parts ABS resin PA-747F 28 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemisons PKD 2290 12 parts Monocizer W-795 plasticizer 52 parts Polyethylene wax 0.6 parts Poly(methyl methacrylate) 3 parts Active calcium carbonate heavy calcium carbonate 20 parts

[0091] The preparation method of the high-strength, super-high-temperature and super-low-temperature resistant, oil-resistant PVC flame-retardant sheath material is as follows:

[0092] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, Monocizer W-795 plasticizer, are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then antimony trioxide, zinc borate, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and when the material temperature drops to 90°C, powdered nitrile rubber and EVA resin are added into the kneader, and the stirring is continuously performed for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, and the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is obtained.

[0093] The pretreated masterbatch obtained above and ABS resin are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, and the mixture is fully stirred and uniformly mixed, and then the material is discharged, and added into a double-screw extruder, and the temperature is set to 160°C, and then a single-screw extruder is used for granulation, and the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is obtained.

[0094] Comparative Example 3

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

[0096] Polyvinyl chloride resin with a degree of polymerization of 2500 66 parts Polyvinyl chloride resin with a degree of polymerization of 1300 33 parts Acrylonitrile content 33% nitrile rubber 12 parts Vinyl acetate content 8% EVA resin 40 parts ABS resin PA-747F 28 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemisons PKD 2290 12 parts TOTM plasticizer 50 parts Polyethylene wax 0.6 parts Poly(methyl methacrylate) 3 parts Active calcium carbonate heavy calcium carbonate 20 parts

[0097] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0098] PVC resin with polymerization degree of 1300, PVC resin with polymerization degree of 2500, TOTM plasticizer, are added into a high-speed mixer and stirred for 1-2 minutes for pre-mixing, then calcium-zinc heat stabilizer is added, and stirred for 2-4 minutes at high speed, then antimony trioxide, zinc borate, filler, lubricant, processing aid are continuously added, and kneaded for 5-10 minutes at high speed, and the stirring is stopped when the temperature reaches 110-120°C, and when the material temperature drops to 90°C, powdered nitrile rubber and EVA resin are added into the kneader, and the stirring is continuously performed for 60-90 seconds, and the material is discharged after the mixture is fully stirred and uniformly mixed, and then the material is added into a double-screw extruder, and the temperature is set to 170°C, and then a single-screw extruder is used for granulation, and the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is obtained.

[0099] The pretreated masterbatch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, a single screw extruder is used for granulation to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0100] Comparative Example 4:

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

[0102] Polyvinyl chloride resin with a degree of polymerization of 2500 66 parts Polyvinyl chloride resin with a degree of polymerization of 1300 33 parts Acrylonitrile content 33% nitrile rubber 25 parts Vinyl acetate content 8% EVA resin 40 parts ABS resin PA-747F 28 parts Antimony trioxide 6 parts Zinc borate 8 parts Kemisons PKD 2290 12 parts Monocizer W-795 plasticizer 50 parts Polyethylene wax 0.6 parts Poly(methyl methacrylate) 3 parts Active calcium carbonate heavy calcium carbonate 20 parts

[0103] The preparation method of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material is as follows:

[0104] The PVC resin with a polymerization degree of 1300, the PVC resin with a polymerization degree of 2500, and the Monocizer W-795 plasticizer are added into a high mixer and stirred for 1-2 minutes for premixing. Then, the calcium-zinc heat stabilizer is fed in, and high-speed mixing is continued for 2-4 minutes. The antimony trioxide, zinc borate, filler, lubricant, and processing aid are continuously fed in, and high-speed kneading is continued for 5-10 minutes. When the temperature reaches 110-120°C, the stirring is stopped. When the material temperature drops to 90°C, the powdered nitrile rubber and EVA resin are fed into the kneader, and the stirring is continued for 60-90 seconds. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 170°C. Then, a single screw extruder is used for granulation to obtain the pretreated masterbatch of the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

[0105] The pretreated masterbatch obtained above, ABS resin are added into high mixer and stirred for 1-2 minutes for premixing. After the mixture is fully stirred and uniformly mixed, the mixture is discharged and fed into a double screw extruder, and the temperature is set to 160°C. Then, a single screw extruder is used for granulation to obtain the high-strength and super-high-temperature and super-low-temperature resistant oil-resistant PVC flame-retardant sheath material.

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

[0107] Table 2

[0108]

[0109] By selecting and optimizing the polymerization degree of 1300, the polymerization degree of 2500 of PVC resin, ABS resin, EVA resin, powder nitrile rubber and other components and formula, a high-strength and super-high-temperature-resistant and super-low-temperature-resistant oil-resistant PVC flame-retardant coating material is prepared. As shown in Tables 1 and 2, the results of Examples 1-7 and Comparative Examples 1-4 show that the PVC coating material prepared by the method of the present application changes in performance with different proportions of ABS resin, EVA resin and powder nitrile rubber components. When ABS resin PA-747F is used for modification, the strength of the material is significantly improved. When the addition amount of ABS resin is 0, the strength of the material decreases sharply. When EVA resin with an acetic acid ethylene content of 8% and nitrile rubber with an 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 an acetic acid ethylene content of 8% is too large, the strength of the material will also decrease accordingly. When the addition amount of nitrile rubber with an acrylonitrile content of 33% is too large, the aging performance of the material will decrease by the same proportion. When Monocizer W-795 plasticizer is replaced by TOTM plasticizer, the aging performance and low temperature resistance of the material will decrease sharply. At the same time, PVC resin with a polymerization degree of 2500 can also increase the strength and cold resistance of the material to some extent, but the processing performance of high polymerization degree PVC is poor, so it needs to be used with PVC resin with a polymerization degree of 1300.

[0110] In summary, according to Tables 1 and 2, the test results in Example 7 not only have superior material strength, elongation, electrical properties and cold resistance, but also have better retention rate data of tensile strength and elongation at break measured by air aging and 902# oil aging than other cases.

[0111] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A high-strength, oil-resistant, ultra-high-temperature and ultra-low-temperature resistant, flame-retardant polyvinyl chloride sheathing compound, characterized in that: Its raw materials include the following components in parts by weight: ​ 40-70 parts of PVC resin with a degree of polymerization of 2500; 30-50 parts of PVC resin with a degree of polymerization of 1300; 15-30 parts of ABS resin; 10-20 parts of powdered nitrile rubber; 30-50 parts of EVA resin; Monocizer W-795 plasticizer 40-70 parts; 5-10 parts of antimony trioxide; 8-12 parts of zinc borate; 20-40 parts of filler; 10-15 parts of calcium-zinc heat stabilizer; Lubricant 0.4~0.6 parts; Processing aids 2-5 parts; The protective layer material is obtained by first granulating raw materials other than ABS resin, and then mixing and granulating the resulting masterbatch with ABS resin a second time.

2. The high-strength, ultra-high-temperature and ultra-low-temperature resistant, oil-resistant, polyvinyl chloride flame-retardant mastic coating of claim 1, wherein: The ABS resin is one or a mixture of several of PA-747F, PA-747R, and HR-181.

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

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

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

6. The high-strength, oil-resistant, and flame-retardant polyvinyl chloride protective coating 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, oil-resistant, and flame-retardant polyvinyl chloride protective coating material according to claim 1, characterized in that: The processing aid is selected from one or a mixture of two of the following: 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, flame-retardant polyvinyl chloride protective coating material, characterized in that: The method for preparing the high-strength, oil-resistant, and ultra-high temperature and ultra-low temperature resistant polyvinyl chloride flame-retardant protective coating material according to any one of claims 1 to 7 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 to a high-speed mixer and stir for 1-2 minutes at a speed of 450-500 r / min to premix. Add calcium-zinc heat stabilizer, then mix at high speed for 2-4 minutes, with a rotation speed of 900-950 r / min; Continue adding antimony trioxide, zinc borate, filler, lubricant, and processing aids, and knead at high speed for 5-10 minutes at a speed of 900-950 r / min; stop when the temperature reaches 110-120℃, and add powdered nitrile rubber and EVA resin to the kneader when the material temperature drops to 90℃. Continue stirring for 60-90 seconds until the mixture is fully mixed, then discharge the material at a speed of 450-500 r / min. Step 2: Extrude the material discharged in Step 1. During extrusion, the temperature of the twin-screw extrusion zone is set to 140~170℃, and the screw speed is set to 220~300 r / min. Step 3: Granulate using a single-screw extruder at an extrusion temperature of 100~130℃ and a rotation speed of 45~50r / min to obtain the pretreatment masterbatch of the high-strength, oil-resistant, flame-retardant polyvinyl chloride protective layer material that is resistant to ultra-high and ultra-low temperatures. Step 4: Add the pretreated masterbatch and ABS resin obtained above into a high-speed mixer and stir for 1-2 minutes at a speed of 450-500 r / min to premix. After the mixture is fully mixed, discharge the material. Step 5: Extrude the material discharged in Step 4. During extrusion, the temperature of the twin-screw extrusion zone is set to 150~170℃, and the screw speed is set to 240~300 r / min. Step 6: Granulate using a single-screw extruder at an extrusion temperature of 100~130℃ and a rotation speed of 45~50r / min to obtain the high-strength, oil-resistant, flame-retardant polyvinyl chloride protective layer material that is resistant to ultra-high and ultra-low temperatures.

Images