Low-temperature-resistant PVC corrugated pipe and preparation method and application thereof

Abstract

The application belongs to the technical field of corrugated pipes, and discloses a low-temperature-resistant PVC corrugated pipe and a preparation method and application thereof, the low-temperature-resistant PVC corrugated pipe comprises the following raw materials in parts by weight: 90-100 parts of PVC, 20-30 parts of HPVC, 15-25 parts of HNBR, 10-15 parts of a functional additive, 8-12 parts of a cold-resistant agent, 2-3 parts of an antioxidant, 2-4 parts of a stabilizer and 1-2 parts of a lubricant; wherein the functional additive is obtained from ethylene-vinyl acetate copolymer grafted diethyl allyl phosphate and glycidyl methacrylate. In the specific PVC / HPVC / HNBR / functional additive system, the synergistic effect of interface compatibility optimization, low-temperature-resistant performance complementation and mechanical property balance makes the PVC corrugated pipe still have excellent performance in a low-temperature environment, and is conducive to the use and popularization in cold regions or regions with seasonal low temperature.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of corrugated pipes, in particular to a low-temperature-resistant PVC corrugated pipe and a preparation method and application thereof. BACKGROUND

[0002] In power transmission and communication engineering, cable protection corrugated pipes, as key components to ensure the safe operation of cables, need to withstand complex environmental tests for a long time, and their performance is directly related to the stability and service life of the power system. Such corrugated pipes not only need to have good mechanical properties (such as sufficient tensile strength, impact resistance and ring stiffness) to resist external extrusion, vibration and other mechanical actions, but also need to adapt to various environmental conditions, including low temperature, heat and humidity, ultraviolet radiation and chemical corrosion, etc.

[0003] Currently, there are still many technical limitations in the practical application of PVC corrugated pipes for cable protection. In low-temperature environments, especially in cold regions or seasonal low-temperature periods, traditional PVC materials are prone to increased brittleness and loss of flexibility due to the decline in molecular chain movement ability, which can cause the corrugated pipe to crack easily during laying, maintenance or external force impact, and cannot effectively wrap the cable, thereby causing cable wear, short circuit and other risks. SUMMARY

[0004] The present application aims to improve at least one technical problem in the background art.

[0005] The first aspect of the present application provides a low-temperature-resistant PVC corrugated pipe, comprising the following raw materials by weight: PVC 90-100 parts, HPVC 20-30 parts, HNBR 15-25 parts, functional additive 10-15 parts, cold-resistant agent 8-12 parts, antioxidant 2-3 parts, stabilizer 2-4 parts, lubricant 1-2 parts.

[0006] The functional additive is obtained from ethylene-vinyl acetate copolymer grafted diethyl allyl phosphate and glycidyl methacrylate.

[0007] In the low-temperature-resistant PVC corrugated pipe, PVC (polyvinyl chloride) is used as a basic resin, which has excellent mechanical strength, chemical stability and cost advantage, and provides basic structural support for the corrugated pipe, but its glass transition temperature is relatively high (about 80℃), the molecular chain movement is limited in a low-temperature environment, and brittle fracture is prone to occur, resulting in a decrease in toughness and a decrease in impact resistance of the corrugated pipe; HPVC (high-strength polyvinyl chloride) has a similar chemical structure to PVC, but has a higher polymerization degree and a longer molecular chain, which can enhance the cohesion of the corrugated pipe, improve the overall rigidity and tensile resistance, and at the same time, can adjust the crystallinity of the PVC matrix, improve the processing fluidity of the corrugated pipe, and make up for the problem of insufficient fluidity of PVC in the processing process due to molecular chain entanglement; HNBR (hydrogenated nitrile rubber) has a very low glass transition temperature (-50℃ to -35℃), and can still maintain the flexibility of the molecular chain at low temperature, and the polar cyano group in the molecular structure can form a weak interaction with the chlorine atoms in PVC and HPVC, enhancing the interface bonding between the rubber phase and the plastic phase, and the oil resistance, wear resistance and aging resistance of HNBR can improve the comprehensive service performance of the corrugated pipe; the functional additive is obtained by grafting diethylallyl phosphate and glycidyl methacrylate onto ethylene-vinyl acetate copolymer (EVA), wherein the EVA segment has good flexibility and compatibility, which can reduce the interfacial tension between the components, the phosphate group of diethylallyl phosphate can form a coordination bond with the chlorine atoms in PVC and HPVC, thereby improving the binding force of components with similar polarity, and the epoxy group of glycidyl methacrylate can undergo ring-opening reaction with the amino group and hydroxyl group in HNBR, thereby strengthening the chemical crosslinking between HNBR and PVC and HPVC, and improving the interfacial compatibility; in addition, the phosphate group of diethylallyl phosphate also has excellent flame retardant function, which can decompose to produce phosphoric acid substances at high temperature, promote the formation of a dense carbon layer on the surface of the corrugated pipe, isolate the transmission of oxygen and heat, and inhibit the spread of flames.

[0008] In terms of compatibility, the functional additive can act as an interfacial compatibilizer, forming chemical or physical bonds with PVC, HPVC, and HNBR through multiple functional groups in the molecular chain, and forming a coordination bond with the polar group (C-Cl) of PVC, a molecular chain entanglement with HPVC, and a cross-linking reaction with the polar group (-CN, -OH) of HNBR through the ring-opening reaction of the epoxy group, thereby enabling HPVC and HNBR to be uniformly dispersed in the PVC matrix to form a stable "island-in-the-sea structure"; in terms of low-temperature resistance, the PVC matrix provides structural strength, HPVC enhances the cohesion of the system, and HNBR as the dispersed phase maintains high elasticity at low temperatures, absorbing impact energy through the rubber phase in the "island-in-the-sea structure" to inhibit crack propagation, thereby solving the problem of PVC brittleness at low temperatures, and the functional additive promotes the interfacial bonding of HPVC, HNBR, and the PVC matrix, avoiding performance degradation due to interfacial peeling at low temperatures, enabling the material to maintain a certain impact strength in a low-temperature environment; in terms of mechanical properties, the high polymerization degree of HPVC improves the rigidity and tensile properties of the PVC matrix, and the elasticity of HNBR compensates for the brittleness of PVC, forming a "rigid-flexible balance" through the bridging action of the functional additive, and the grafted chains of the functional additive can entangle between the molecular chains of PVC and HPVC, enhancing the intermolecular force, and cooperating with antioxidants and stabilizers, etc., to further improve the anti-aging performance and long-term service stability of the material.

[0009] Preferably, the grafting rate of diethyl allyl phosphate is 5%-8%, and the grafting rate of glycidyl methacrylate is 3%-4%.

[0010] Diethyl allyl phosphate, as the core of the flame-retardant function, needs to have a certain grafting rate to provide enough phosphorus-containing groups to ensure that the material can effectively decompose to produce flame-retardant gases (such as phosphoric anhydride) and form a barrier carbon layer when burning, meeting the flame-retardant requirements. Glycidyl methacrylate realizes compatibilization by reacting with the polar functional groups of PVC, HPVC, and HNBR through the epoxy group. Too high a grafting rate may lead to too high a cross-linking degree and a decrease in flexibility, and too low a grafting rate may not fully improve the interfacial compatibility. A grafting rate of 3%-4% can balance the compatibilization effect and the toughness of the material.

[0011] Preferably, the functional additive is prepared by mixing ethylene-vinyl acetate copolymer, diethyl allyl phosphate, glycidyl methacrylate, and an initiator, extruding and granulating, and washing to obtain the functional additive. The temperature for extruding and granulating is 130°C-140°C.

[0012] Preferably, the cold-resistant agent is obtained by polymerizing dipentaerythritol with 3,6-dimethyl-1,4-dioxane-2,5-dione, and the molar ratio of dipentaerythritol to 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:80.

[0013] The cold-resistant agent in the application is an eight-arm star structure. In the unique molecular structure, the eight shorter arm segments have excellent segment mobility, which can move more freely in a low-temperature environment, effectively reducing the glass transition temperature and embrittlement temperature of PVC, so that the PVC corrugated pipe still maintains good flexibility and impact resistance at a lower temperature, and the low-temperature embrittlement phenomenon is greatly reduced. At the same time, the structure has excellent compatibility with the PVC matrix, the ester group polar group contained therein can form stable interaction with the C-Cl bond in PVC, and the eight branched chains provide more action sites with the PVC segment, ensuring uniform dispersion in the matrix, avoiding phase separation, and ensuring the stability and uniformity of the cold resistance effect. Compared with other structures such as four-arm structure, when the monomers are the same and the total molecular weight is similar, the eight-arm structure has shorter arms, better segment mobility, and larger molecular free volume, which is more matched with the molecular packing density of PVC, can more efficiently break the rigid packing of PVC, has more outstanding cold resistance performance, and has more contact points and more stable interface compatibility, which can significantly improve the low-temperature toughness of the PVC corrugated pipe.

[0014] The preparation of the cold-resistant agent comprises the following steps: after recrystallization of dipentaerythritol, the cold-resistant agent is obtained by polymerization reaction of dipentaerythritol with 3,6-dimethyl-1,4-dioxane-2,5-dione under the catalysis of stannous octoate.

[0015] Preferably, the antioxidant is at least one of thio-phenol antioxidant, triazine hindered phenol antioxidant, triisocyanate hindered phenol antioxidant, naphthylamine, diphenylamine, p-diphenylamine and quinoline derivative; the stabilizer comprises at least one of tribasic lead sulfate, dioctyl dimaleate tin, tributyl tin oxide and zinc stearate; and the lubricant comprises at least one of calcium stearate, barium stearate, dioctyl adipate, dioctyl sebacate, oxidized polyethylene wax and pentaerythritol stearate.

[0016] The second aspect of the application provides a preparation method of the low-temperature-resistant PVC corrugated pipe, comprising the following steps:

[0017] The PVC, the HPVC, the HNBR, the functional additive, the cold-resistant agent, the antioxidant, the stabilizer and the lubricant are uniformly mixed to obtain a mixture;

[0018] The mixture is plasticized and molded to obtain the low-temperature-resistant PVC corrugated pipe.

[0019] The temperature for plasticizing is 175-190 DEG C, and the temperature for molding is 180-200 DEG C.

[0020] The difference between the temperature for plasticizing and the temperature for molding is not more than 5 DEG C.

[0021] The third aspect of the application provides the application of the low-temperature-resistant PVC corrugated pipe in cable protection.

[0022] The present application has the beneficial effect that, in a specific PVC / HPVC / HNBR / functional additive system, the synergistic effect of interface compatibility optimization, low-temperature performance complementation and mechanical property balance makes the PVC corrugated pipe still have excellent performance in a low-temperature environment, which is conducive to the use and promotion in cold regions or seasonal low-temperature period regions. DETAILED DESCRIPTION

[0023] The present application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate but not to limit the scope of the present application. Furthermore, it should be understood that, after reading the content described in the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0024] Example 1

[0025] A low-temperature-resistant PVC corrugated pipe comprises the following raw materials by weight: 96 parts of PVC, 24 parts of HPVC, 18 parts of HNBR, 13 parts of functional additives, 10 parts of cold-resistant agent, 2.5 parts of thio-phenyl antioxidant, 3 parts of tributyl tin oxide (stabilizer), and 1 part of calcium stearate (lubricant);

[0026] The functional additives are obtained from ethylene-vinyl acetate copolymer grafted diethyl allyl phosphate (grafting rate of 7%) and glycidyl methacrylate (grafting rate of 4%);

[0027] The preparation of the functional additives comprises the following steps: ethylene-vinyl acetate copolymer, diethyl allyl phosphate, glycidyl methacrylate and benzoyl peroxide (initiator) with a mass ratio of 100:9:6:1 are put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 20 min), and then put into an extruder for extrusion granulation (the temperature for extrusion granulation is 140℃), and washed with ethanol and deionized water to remove unreacted monomers and initiator residues, and dried to obtain the functional additives;

[0028] The cold-resistant agent is obtained by polymerization of dipentaerythritol and 3,6-dimethyl-1,4-dioxane-2,5-dione, and the molar ratio of dipentaerythritol to 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:80;

[0029] The preparation of the cold-resistant agent comprises the following steps: after dipentaerythritol is recrystallized, it is polymerized with 3,6-dimethyl-1,4-dioxane-2,5-dione under the catalysis of stannous octoate to obtain the cold-resistant agent.

[0030] The preparation method of the low-temperature-resistant PVC corrugated pipe of Example 1 is as follows:

[0031] The PVC, HPVC, HNBR, functional additive, cold resistance agent, thio-phenol antioxidant, tributyltin oxide and calcium stearate are put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 30 min) to obtain a mixture;

[0032] The mixture is put into an extruder for plasticization (the plasticization temperature is 180℃) and molding (the molding temperature is 185℃), and finally cut to obtain the low-temperature-resistant PVC corrugated pipe.

[0033] Example 2

[0034] A low-temperature-resistant PVC corrugated pipe, comprising the following raw materials by weight: PVC 92 parts, HPVC 27 parts, HNBR 20 parts, functional additive 11 parts, cold resistance agent 8 parts, trimer isocyanate hindered phenol antioxidant 2.7 parts, dioctyltin bis-maleate (stabilizer) 2.5 parts, dioctyl sebacate (lubricant) 1.2 parts;

[0035] The functional additive is obtained from ethylene-vinyl acetate copolymer grafted diethylallyl phosphate (grafting rate 6%) and glycidyl methacrylate (grafting rate 3%);

[0036] The preparation of the functional additive comprises the following steps: ethylene-vinyl acetate copolymer, diethylallyl phosphate, glycidyl methacrylate and benzoyl peroxide (initiator) with a mass ratio of 100:8:5:1 are put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 20 min), and then put into an extruder for extrusion granulation (the temperature of extrusion granulation is 140℃), washed with ethanol and deionized water to remove unreacted monomers and initiator residues, and dried to obtain the functional additive;

[0037] The cold resistance agent is obtained by polymerization of dipentaerythritol and 3,6-dimethyl-1,4-dioxane-2,5-dione, and the molar ratio of dipentaerythritol to 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:80;

[0038] The preparation of the cold resistance agent comprises the following steps: after dipentaerythritol is recrystallized, it is polymerized with 3,6-dimethyl-1,4-dioxane-2,5-dione under the catalysis of stannous octoate to obtain the cold resistance agent.

[0039] The preparation method of the low-temperature-resistant PVC corrugated pipe of Example 2 is as follows:

[0040] PVC, HPVC, HNBR, functional additives, cold resistance agent, thio-phenolic antioxidant, tributyltin oxide and calcium stearate were put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 30 min) to obtain a mixture;

[0041] The mixture was put into an extruder for plasticization (the plasticization temperature was 185℃) and molding (the molding temperature was 190℃), and finally cut to obtain the low-temperature-resistant PVC corrugated pipe.

[0042] Example 3

[0043] A low-temperature-resistant PVC corrugated pipe, comprising the following raw materials by weight: PVC 100 parts, HPVC 21 parts, HNBR 18 parts, functional additives 12 parts, cold resistance agent 11 parts, triazine hindered phenolic antioxidant 3 parts, zinc stearate (stabilizer) 2 parts, dioctyl adipate (lubricant) 1.5 parts;

[0044] The functional additives are obtained from ethylene-vinyl acetate copolymer grafted diethyl allyl phosphate (grafting rate of 6%) and glycidyl methacrylate (grafting rate of 4%);

[0045] The preparation of the functional additives comprises the following steps: ethylene-vinyl acetate copolymer, diethyl allyl phosphate, glycidyl methacrylate and benzoyl peroxide (initiator) in a mass ratio of 100:8:6:1 were put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 20 min), and then put into an extruder for extrusion granulation (the temperature of extrusion granulation was 140℃), washed with ethanol and deionized water to remove unreacted monomers and initiator residues, and dried to obtain the functional additives;

[0046] The cold resistance agent is obtained by polymerization of dipentaerythritol and 3,6-dimethyl-1,4-dioxane-2,5-dione, and the molar ratio of dipentaerythritol to 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:80;

[0047] The preparation of the cold resistance agent comprises the following steps: after dipentaerythritol is recrystallized, it is polymerized with 3,6-dimethyl-1,4-dioxane-2,5-dione under the catalysis of stannous octoate to obtain the cold resistance agent.

[0048] The preparation method of the low-temperature-resistant PVC corrugated pipe of Example 3 is as follows:

[0049] PVC, HPVC, HNBR, functional additives, cold resistance agent, thio-phenolic antioxidant, tributyltin oxide and calcium stearate were put into a high-speed mixer and mixed uniformly (stirring at 800 r / min for 30 min) to obtain a mixture;

[0050] The mixture is put into an extruder for plasticizing (the plasticizing temperature is 190℃) and molding (the molding temperature is 190℃), and finally cut to obtain the low-temperature-resistant PVC corrugated pipe.

[0051] Comparative Example 1

[0052] A PVC corrugated pipe, which is different from Example 1 in that the weight part of HPVC is 5 parts. The others are the same as Example 1.

[0053] Comparative Example 2

[0054] A PVC corrugated pipe, which is different from Example 1 in that the weight part of HPVC is 40 parts. The others are the same as Example 1.

[0055] Comparative Example 3

[0056] A PVC corrugated pipe, which is different from Example 1 in that the weight part of HNBR is 3 parts. The others are the same as Example 1.

[0057] Comparative Example 4

[0058] A PVC corrugated pipe, which is different from Example 1 in that the weight part of HNBR is 35 parts. The others are the same as Example 1.

[0059] Comparative Example 5

[0060] A PVC corrugated pipe, which is different from Example 1 in that no functional additive is added. The others are the same as Example 1.

[0061] Comparative Example 6

[0062] A PVC corrugated pipe, which is different from Example 1 in that the grafting rate of diethyl allyl phosphate in the functional additive is 2%. The others are the same as Example 1.

[0063] Comparative Example 7

[0064] A PVC corrugated pipe, which is different from Example 1 in that the grafting rate of glycidyl methacrylate in the functional additive is 1%. The others are the same as Example 1.

[0065] Comparative Example 8

[0066] A PVC corrugated pipe, which is different from Example 1 in that the grafting rate of glycidyl methacrylate in the functional additive is 8%. The others are the same as Example 1.

[0067] Comparative Example 9

[0068] A PVC corrugated pipe, which is different from Example 1 in that the functional additive is obtained by grafting diethyl allyl phosphate and glycidyl methacrylate on PE. The others are the same as Example 1.

[0069] Comparative Example 10

[0070] A PVC corrugated pipe, which is different from Example 1 in that no cold resistance agent is added. The others are the same as Example 1.

[0071] Comparative Example 11

[0072] A PVC corrugated pipe, which is different from Example 1 in that the cold resistance agent is obtained by polymerization of pentaerythritol and 3,6-dimethyl-1,4-dioxane-2,5-dione, and the molar ratio of pentaerythritol to 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:20. The others are the same as Example 1.

[0073] Effect test experiment

[0074] The products prepared in the above examples and comparative examples were subjected to performance tests, and the relevant test methods are as follows:

[0075] Tensile strength test: according to ISO 527-1 and ISO 527-2;

[0076] Flame retardant performance - limiting oxygen index (LOI) test: according to ISO 4589-2;

[0077] Print-through index (PTI) test: according to GB / T 4207-2012;

[0078] Low temperature brittleness test: according to GB / T 15256-2014;

[0079] The test results are shown in Table 1.

[0080] Table 1 Performance test results

[0081]

[0082] Compared with Example 1, the amount of HPVC in Comparative Example 1 is too small, the rigidity support is weakened due to the lack of HPVC, the tensile resistance and low-temperature resistance of the material are reduced, the tensile strength is significantly reduced, and the low-temperature brittleness temperature is increased; the amount of HPVC in Comparative Example 2 is too large, the toughness of the corrugated pipe is reduced, the overall performance deviates from the optimal state, the tensile strength is slightly reduced, and the low-temperature brittleness temperature is increased; the amount of HNBR in Comparative Example 3 is too small, which cannot provide sufficient low-temperature elasticity, the material brittleness is increased, the tensile strength is significantly reduced, and the low-temperature brittleness temperature is greatly increased; the amount of HNBR in Comparative Example 4 is too large, although the low-temperature brittleness temperature is slightly improved, the excess rubber phase weakens the rigidity of the corrugated pipe, resulting in a decrease in overall mechanical properties; Comparative Example 5 lacks functional additives, resulting in poor compatibility of each component and the disappearance of synergistic effect, and the flame retardancy, tracking resistance and low-temperature resistance are all deteriorated; in Comparative Example 6, the grafting of diethyl allyl phosphate, a functional additive, is too small, and the flame retardancy and compatibility are weakened due to the lack of phosphate groups; in Comparative Example 7, the grafting of glycidyl methacrylate, a functional additive, is too small, and the interface bonding force between the HNBR phase and the PVC and HPVC phases is weakened due to the lack of epoxy groups, the compatibility is reduced, the tensile strength is significantly reduced, and the low-temperature brittleness temperature is increased; in Comparative Example 8, the grafting of glycidyl methacrylate, a functional additive, is too large, and the molecular chain is excessively crosslinked due to the excessive epoxy groups, the toughness of the material is damaged, the tensile strength of the corrugated pipe is reduced, and the low-temperature brittleness temperature is increased; in Comparative Example 9, PE is a non-polar hydrocarbon chain structure, which has poor compatibility with PVC, HPVC and HNBR, affects the combination between PVC, HPVC and HNBR, and the synergistic effect cannot work; in Comparative Example 10, the lack of cold-resistant agent cannot effectively improve the low-temperature fluidity of the molecular chain, resulting in deterioration of the low-temperature resistance; in Comparative Example 11, the cold-resistant agent obtained by polymerization is a four-arm star structure, which has fewer branches than the eight-arm star structure, has poor dispersibility in the system, and has weaker toughening effect, resulting in an increase in the low-temperature brittleness temperature of the corrugated pipe.

[0083] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and supplements without departing from the method of the present application, and these improvements and supplements should also be considered within the protection scope of the present application.

Claims

1. A low temperature resistant PVC corrugated pipe, characterized in that, The raw materials include the following components by weight: PVC 90-100 parts, HPVC 20-30 parts, HNBR 15-25 parts, functional additive 10-15 parts, cold resistance agent 8-12 parts, antioxidant 2-3 parts, stabilizer 2-4 parts, lubricant 1-2 parts; The functional additive is obtained from ethylene-vinyl acetate copolymer grafted diethyl allyl phosphate and glycidyl methacrylate; The grafting rate of the diethyl allyl phosphate is 5%-8%, and the grafting rate of the glycidyl methacrylate is 3%-4%; the cold resistance agent is obtained by polymerization of dipentaerythritol and 3,6-dimethyl-1,4-dioxane-2,5-dione under catalysis of stannous octoate.

2. The cryogenic resistant PVC bellows of claim 1, wherein, The preparation of the functional additive includes the following steps: uniformly mixing the ethylene-vinyl acetate copolymer, the diethyl allyl phosphate, the glycidyl methacrylate and an initiator, extruding and granulating, and washing to obtain the functional additive; the temperature of the extruding and granulating is 130-140℃.

3. The cold-resistant PVC corrugated pipe according to claim 1, characterized in that, The molar ratio of the dipentaerythritol to the 3,6-dimethyl-1,4-dioxane-2,5-dione is 1:

80.

4. The cryogenic resistant PVC bellows of claim 3, wherein, The preparation of the cold resistance agent includes the following steps: after recrystallization of the dipentaerythritol, polymerization reaction with the 3,6-dimethyl-1,4-dioxane-2,5-dione under catalysis of the stannous octoate to obtain the cold resistance agent.

5. The cryogenic resistant PVC bellows of claim 1, wherein, The antioxidant is at least one of thio-phenolic antioxidant, triazine hindered phenolic antioxidant, triisocyanate hindered phenolic antioxidant, naphthylamine antioxidant, diphenylamine antioxidant and quinoline derivative antioxidant; and / or, the stabilizer includes at least one of tribasic lead sulfate, tributyl tin oxide and zinc stearate; and / or, the lubricant includes at least one of calcium stearate, barium stearate, oxidized polyethylene wax and pentaerythritol stearate.

6. A process for the production of a low temperature resistant PVC corrugated pipe according to any one of claims 1 to 5, characterized in that, The method includes the following steps: uniformly mixing the PVC, the HPVC, the HNBR, the functional additive, the cold resistance agent, the antioxidant, the stabilizer and the lubricant to obtain a mixture; plasticizing the mixture to mold and form to obtain the low-temperature-resistant PVC corrugated pipe.

7. The method of claim 6, wherein the low temperature resistant PVC corrugated pipe is prepared by the steps of: The temperature of the plasticizing is 175-190℃, and the temperature of the mold and forming is 180-200℃.

8. The method of claim 7, wherein the low temperature resistant PVC corrugated pipe is prepared by the steps of: The difference between the temperature of the plasticizing and the temperature of the mold and forming is not more than 5℃.

9. Use of the low-temperature-resistant PVC corrugated pipe according to any one of claims 1-5 in cable protection.

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