A PVC material, a PVC pipe and a preparation method and application thereof

Abstract

This invention discloses a PVC material, a PVC pipe, its preparation method, and its applications, belonging to the field of polymer materials technology. The PVC material, by weight, comprises the following components: 100 parts PVC resin, 3-5 parts PVC stabilizer, 4-6 parts non-polar rubber, 2-4 parts layered structural material, 4-6 parts grafted maleic anhydride compatibilizer, and 40-60 parts inorganic filler; wherein the layered structural material is one or more of boron nitride, graphene, organomontmorillonite, organokaolin, or organobentonite. This invention discloses a PVC material that, through the synergistic effect of non-polar rubber, layered structural material, and grafted maleic anhydride compatibilizer, improves the cold resistance of the PVC material, maintaining good mechanical properties even after freezing.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a PVC material, a PVC pipe, a method for preparing the same, and its applications. Background Technology

[0002] Drainage pipes have a wide range of applications. Due to the combined effects of oxygen, temperature, ultraviolet rays and moisture, climate aging can cause severe degradation of the polymers inside the pipes, ultimately leading to a decline in the functionality of the drainage pipes and a shortened service life.

[0003] Existing PVC drainage pipes have poor cold resistance. To improve the low-temperature resistance of PVC pipes, existing technology discloses a low-temperature resistant PVC flexible hose. This is achieved by adding low-temperature modifiers such as dioctyl sebacate (DOS), dioctyl adipate (DOA), and dibenzyl sorbitol (DBS) to PVC. However, this only meets the basic requirement of not breaking after a low-temperature drop hammer test, and does not provide test results for the mechanical properties of the material after freezing, making it impossible to know the degree of mechanical property degradation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects and shortcomings of the poor cold resistance of existing PVC materials used to prepare PVC drainage pipes, and to provide a PVC material with excellent cold resistance and good mechanical properties after freezing.

[0005] Another object of the present invention is to provide a PVC pipe.

[0006] Another object of the present invention is to provide a PVC composite pipe.

[0007] Another object of the present invention is to provide a method for preparing PVC composite pipe.

[0008] Another object of the present invention is to provide an application of PVC composite pipe in building drainage pipes.

[0009] The above-mentioned objective of this invention is achieved through the following technical solution:

[0010] A PVC material, by weight, comprises the following components: 100 parts PVC resin, 3-5 parts PVC stabilizer, 4-6 parts non-polar rubber, 2-4 parts lamellar structure material, 4-6 parts grafted maleic anhydride compatibilizer, and 40-60 parts inorganic filler.

[0011] The layered structural material is one or more of boron nitride, graphene, organomontmorillonite, organokaolinite, and organobentonite.

[0012] Non-polar rubber has low molecular cohesive energy and excellent cold resistance, which can improve the low-temperature crack resistance of PVC materials.

[0013] Layered structures help form long-range ordered layered structures in PVC resin matrices, which can effectively prevent crack initiation and propagation, transforming the composite material from brittle fracture to ductile fracture, effectively improving the fatigue durability limit of the material. At the same time, the layered structure can effectively alleviate the aging of the material by inhibiting the volatilization of hydrogen chloride and the penetration of oxygen in PVC, so that the material can maintain good mechanical properties after freezing and ultraviolet radiation.

[0014] The addition of non-polar rubber increases the cold resistance of PVC materials. This is because non-polar rubber can act as a toughening agent, chemically coupling with PVC under the action of a grafted maleic anhydride compatibilizer. The polar aldehyde groups on the maleic anhydride graft molecular chain chemically bond with the polar groups in the PVC material, while the non-polar segments chemically bond with the rubber molecules. When PVC materials are in low-temperature environments, the bonding of the non-polar portions increases the spacing between polymer chains, weakens the interaction, hinders the interaction between polymers, increases the degree of freedom of movement between molecular chains, and increases its flexibility. At this time, the cohesive energy of the polymer molecules decreases, giving it excellent anti-migration ability in cold environments, improving cold resistance, and maintaining good mechanical properties after freezing.

[0015] Preferably, the layered structural material is boron nitride.

[0016] Preferably, the inorganic filler can be one or more of the following: calcium carbonate, kaolin, attapulgite, bentonite, talc, titanium dioxide, wollastonite, coal gangue powder, sepiolite powder, feldspar powder, mica powder, and red mud.

[0017] Preferably, the particle size of the selected inorganic filler is 400-600 mesh.

[0018] Preferably, the non-polar rubber is one or more of butadiene rubber, natural rubber, styrene-butadiene rubber, ethylene propylene diene monomer (EPDM) rubber, or butyl rubber.

[0019] More preferably, the non-polar rubber is butadiene rubber.

[0020] Preferably, the grafted maleic anhydride compatibilizer is one or more of ABS-g-MAH, PE-g-MAH, PP-g-MAH, SMA, POE-g-MAH or EVA-g-MAH.

[0021] More preferably, the grafted maleic anhydride compatibilizer is ABS-g-MAH and EVA-g-MAH.

[0022] Preferably, the material further includes 0.5 to 1.5 parts of polyphosphoric acid.

[0023] High-altitude areas experience strong ultraviolet radiation. When exposed to ultraviolet light, polyphosphoric acid (PAA) can convert the high-energy ultraviolet light energy into heat or release non-destructive long-wavelength light, thus protecting PVC materials from UV damage. Therefore, polyphosphoric acid can improve the UV resistance of PVC materials.

[0024] The present invention also protects the use of the PVC material described in any of the above claims in the preparation of PVC pipes.

[0025] This invention also protects a PVC pipe made from any of the PVC materials described above.

[0026] The present invention also protects a PVC composite pipe comprising, from the inside out, an inner layer, a core layer and an outer layer, wherein the outer layer is prepared from any of the PVC materials described above.

[0027] Preferably, the inner layer is prepared from an antibacterial material, which includes 100 parts of PVC resin, 3-5 parts of PVC stabilizer, 35-45 parts of quaternary phosphate salt, 0.5-1.5 parts of color masterbatch, and 4-8 parts of antioxidant.

[0028] Quaternary phosphates are organic antibacterial agents with strong polarization properties, which make the inner layer easy to adsorb bacteria and have a bactericidal effect. They can improve the antibacterial performance of the inner layer and effectively inhibit bacterial growth and reproduction. They can be used in hospital drainage pipes and have a long-lasting antibacterial effect.

[0029] Preferably, the PVC stabilizer is a calcium-zinc stabilizer.

[0030] Preferably, the color masterbatch is white.

[0031] Preferably, the antioxidant is a phenolic compound.

[0032] Preferably, the core layer is prepared from a foamed sound insulation material, which is made by supercritical foaming of 60-80 parts organic polymer and 3-5 parts plant fiber.

[0033] The core layer adopts a porous foam structure design to achieve sound absorption and noise reduction.

[0034] The organic polymer can be one or more of polylactic acid (PLA), polyimide (PI), polymethyl methacrylate (PMMA), polyether polyurethane (PEU), polyethylene (PE) / polypropylene (PP) hybrid, polystyrene (PP), polyurethane (PU), and polyvinyl alcohol (PVA).

[0035] Preferably, the organic polymer can be polylactic acid (PLA).

[0036] Plant fibers can be one or more of the following: kenaf fiber, tea fiber, loofah fiber, wood fiber, and bamboo fiber.

[0037] The core layer is foamed using supercritical fluid CO2 / N2, which dissolves in the polymer melt to create a homogeneous mixture. As this mixture passes through a mold, the rapid pressure drop causes phase separation and bubble nucleation, ultimately forming a porous foam structure that gives the intermediate layer excellent sound absorption and noise reduction capabilities.

[0038] This invention also protects a method for preparing the PVC composite pipe according to any one of the above claims, comprising the following steps:

[0039] S1. Mix the inner layer materials, melt-extrude them at 180~220℃, and dry them to obtain inner layer masterbatch A;

[0040] The core layer materials are mixed to obtain core layer material B;

[0041] The outer layer material is mixed, melt-extruded at 180~220℃, and dried to obtain outer layer masterbatch C;

[0042] S2. The inner layer masterbatch A, core layer material B and outer layer masterbatch C are added to a three-layer co-pressure extruder, kneaded at high temperature and then continuously extruded, cooled and shaped to obtain the PVC composite pipe.

[0043] In step S1, the mixing temperature can be 110–120°C. The mixing can be done in a mixer.

[0044] In step S1, drying can be carried out at 40-50℃ for 6-8 hours.

[0045] This invention provides a PVC drainage pipe with antibacterial, noise-reducing, and anti-aging functions, endowing the drainage pipe with excellent antibacterial, noise-reducing, and anti-aging properties. It can extend the lifespan of plastic pipes, promote the sustainable development of the ecological environment, and is of great significance for energy conservation and emission reduction.

[0046] Preferably, the total weight percentage of the pipe is 100, and the ratio of masterbatch A, powder B, and masterbatch C is 15-25 parts: 35-45 parts: 50-30 parts.

[0047] Preferably, the three-layer co-extruder includes a main extruder, a first auxiliary extruder, and a second auxiliary extruder. The main extruder is primarily used for extruding the foam core layer, with a heating temperature of 170–190°C. The first auxiliary extruder is used for extruding the antibacterial inner layer, with a heating temperature of 190–210°C. The second auxiliary extruder is used for extruding the anti-aging outer layer, with a heating temperature of 160–180°C.

[0048] The main unit of the three-layer co-pressure extruder is connected to a syringe pump, which introduces a foaming agent (supercritical fluid CO2 / N2) into the melting zone of powder B, with an injection rate of 0.508 parts / h.

[0049] The present invention also protects the application of the PVC composite pipe described in any of the above claims in building drainage pipes.

[0050] The present invention also protects the use of the PVC composite pipe described in any of the above claims in drainage pipes for medical systems.

[0051] Compared with the prior art, the beneficial effects of the present invention are:

[0052] This invention discloses a PVC material that improves the cold resistance of PVC material through the synergistic effect of non-polar rubber, layered structural material and grafted maleic anhydride compatibilizer, and still has good mechanical properties after freezing. Detailed Implementation

[0053] The present invention will be further described below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise stated, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0054] Examples 1-7

[0055] A PVC material, by weight, comprises the following components: polyvinyl chloride resin, PVC stabilizer, non-polar rubber, polyphosphoric acid, layered structural material, grafted maleic anhydride compatibilizer, and inorganic filler.

[0056] The specific content of each component is shown in Table 1 below.

[0057] Table 1. PVC material composition of each embodiment (by weight parts)

[0058]

[0059] The specific preparation method of the above-mentioned PVC material is as follows:

[0060] All components are added together into a mixer, the mixer temperature is set to 115℃, and then the linear raw material is melted and extruded at 190℃. After pelleting and cooling, it is dried at 45℃ for 7 hours.

[0061] Example 8

[0062] A PVC composite drainage pipe with a thickness of 3.2 mm.

[0063] The preparation method is as follows:

[0064] Step 1, Preparation of PVC drainage pipe masterbatch with inner antibacterial function;

[0065] Weigh out 100 parts of polyvinyl chloride resin (PVC), 4 parts of calcium-zinc stabilizer, 40 parts of quaternary phosphate salt, 1 part of white masterbatch, and 6 parts of phenolic antioxidant, and add them together to a mixer. Set the mixer temperature to 115℃. Then, melt-extrude the linear raw material at 190℃, granulate it, cool it, and dry it at 45℃ for 7 hours to obtain inner layer masterbatch A.

[0066] Step 2, Preparation of raw materials for the core layer sound-absorbing and sound-insulating porous foam layer;

[0067] Weigh 70 parts of biodegradable polymer polylactic acid (PLA) and 4 parts of natural fiber rice husk (RH) and add them to a mixer. Stir at high speed for 5 minutes to mix them evenly and obtain noise reduction functional layer powder B.

[0068] Step 3: Preparation of outer layer high cold-resistant and UV-resistant PVC drainage pipe masterbatch;

[0069] The formulation of Example 1 was used for preparation.

[0070] Step 4: Preparation of a three-layer co-coating integrally molded multifunctional drainage pipe with antibacterial, noise reduction, and anti-aging properties;

[0071] 25 parts of masterbatch A were weighed and fed into the auxiliary machine 1 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 210℃ for melting. 45 parts of powder B were fed into the main machine of the three-layer co-extrusion machine, and the heating temperature was adjusted to 190℃ for melting. At the same time, supercritical CO2 foaming agent was injected through a syringe pump at a rate of 0.508 parts / h. 30 parts of masterbatch C were fed into the auxiliary machine 2 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 160℃ for melting. After high-temperature kneading, the mixture was continuously extruded, cooled and shaped to obtain a PVC composite drainage pipe with multiple functions of antibacterial, noise reduction and anti-aging.

[0072] Example 9

[0073] A PVC composite drainage pipe is prepared as follows:

[0074] Step 1, Preparation of PVC drainage pipe masterbatch with inner antibacterial function;

[0075] Weigh out 100 parts of polyvinyl chloride resin (PVC), 3 parts of calcium-zinc stabilizer, 35 parts of quaternary phosphate salt, 0.5 parts of white masterbatch, and 4 parts of phenolic antioxidant, and add them to a mixer. Set the mixer temperature to 110℃. Then, melt-extrude the linear raw material at 180℃, granulate it, cool it, and dry it at 40℃ for 8 hours to obtain inner layer masterbatch A.

[0076] Step 2, Preparation of raw materials for the core layer sound-absorbing and sound-insulating porous foam layer;

[0077] Weigh 60 parts of biodegradable polymer polylactic acid (PLA) and 3 parts of natural fiber rice husk (RH) and add them to a mixer. Stir at high speed for 5 minutes to mix them evenly and obtain noise reduction functional layer powder B.

[0078] Step 3: Preparation of outer layer high cold-resistant and UV-resistant PVC drainage pipe masterbatch;

[0079] Weigh out 100 parts of polyvinyl chloride resin (PVC), 3 parts of calcium-zinc stabilizer, 4 parts of butadiene rubber (BR), 0.5 parts of polyphosphoric acid (PPA), 2 parts of boron nitride (BN), 4 parts of grafted maleic anhydride compatibilizer ABS-g-MAH, and 50 parts of 400-mesh kaolin and add them to a mixer. Set the mixer temperature to 110℃, then melt-extrude the linear raw material at 180℃, granulate, cool, and dry at 40℃ for 8 hours to obtain outer masterbatch C.

[0080] Step 4: Preparation of a three-layer co-coating integrally molded multifunctional polyvinyl chloride drainage pipe with antibacterial, noise reduction, and anti-aging properties;

[0081] 20 parts of masterbatch A were weighed and fed into the auxiliary machine 1 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 200℃ for melting. 40 parts of powder B were fed into the main machine of the three-layer co-extrusion machine, and the heating temperature was adjusted to 180℃ for melting. At the same time, supercritical CO2 foaming agent was injected through a syringe pump at a rate of 0.508 parts / h. 40 parts of masterbatch C were fed into the auxiliary machine 2 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 170℃ for melting. After high-temperature kneading, the mixture was continuously extruded, cooled, and shaped to obtain a PVC composite drainage pipe with multiple functions of antibacterial, noise reduction, and anti-aging properties.

[0082] Example 10

[0083] A PVC composite drainage pipe is prepared as follows:

[0084] Step 1, Preparation of PVC drainage pipe masterbatch with inner antibacterial function;

[0085] Weigh out 100 parts of polyvinyl chloride resin (PVC), 5 parts of calcium-zinc stabilizer, 45 parts of quaternary phosphate salt, 1.5 parts of white masterbatch, and 8 parts of phenolic antioxidant, and add them to a mixer. Set the mixer temperature to 120℃. Then, melt-extrude the linear raw material at 200℃, granulate it, cool it, and dry it at 50℃ for 6 hours to obtain inner layer masterbatch A.

[0086] Step 2, Preparation of raw materials for the core layer sound-absorbing and sound-insulating porous foam layer;

[0087] Weigh 80 parts of biodegradable polymer polylactic acid (PLA) and 5 parts of natural fiber rice husk (RH) and add them to a mixer. Stir at high speed for 5 minutes to mix them evenly and obtain noise reduction functional layer powder B.

[0088] Step 3: Preparation of outer layer high cold-resistant and UV-resistant PVC drainage pipe masterbatch;

[0089] Weigh out 100 parts of polyvinyl chloride resin (PVC), 3 parts of calcium-zinc stabilizer, 6 parts of butadiene rubber (BR), 1.5 parts of polyphosphoric acid (PPA), 4 parts of boron nitride (BN), 6 parts of grafted maleic anhydride compatibilizer ABS-g-MAH, and 60 parts of 600-mesh kaolin and add them to a mixer. Set the mixer temperature to 110℃, then melt-extrude the linear raw material at 180℃. After pelleting and cooling, dry it at 40℃ for 8 hours to obtain outer masterbatch C.

[0090] Step 4: Preparation of a three-layer co-coating integrally molded multifunctional drainage pipe with antibacterial, noise reduction, and anti-aging properties;

[0091] 15 parts of masterbatch A were weighed and fed into the auxiliary machine 1 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 190℃ for melting. 35 parts of powder B were fed into the main machine of the three-layer co-extrusion machine, and the heating temperature was adjusted to 170℃ for melting. At the same time, supercritical CO2 foaming agent was injected through a syringe pump at a rate of 0.508 parts / h. 50 parts of masterbatch C were fed into the auxiliary machine 2 of the three-layer co-extrusion machine, and the heating temperature was adjusted to 180℃ for melting. After high-temperature kneading, the mixture was continuously extruded, cooled and shaped to obtain a PVC composite drainage pipe with multiple functions of antibacterial, noise reduction and anti-aging.

[0092] Comparative Example 1

[0093] A PVC material, prepared by the following method:

[0094] Unlike Example 1, non-polar rubber is not included.

[0095] Comparative Example 2

[0096] A PVC material, prepared by the following method:

[0097] Unlike Example 1, it does not include layered structural materials.

[0098] Comparative Example 3

[0099] A PVC material, prepared by the following method:

[0100] Unlike Example 1, this example does not include a grafted maleic anhydride compatibilizer.

[0101] Comparative Example 4

[0102] A PVC material, prepared by the following method:

[0103] The difference from Example 1 is that the non-polar rubber cis-butadiene rubber is replaced with the polar rubber nitrile rubber.

[0104] Comparative Example 5

[0105] A PVC composite pipe is prepared by the following method:

[0106] Unlike Example 8, the outer layer is made of the PVC material of Comparative Example 1.

[0107] Comparative Example 6

[0108] A PVC composite pipe is prepared by the following method:

[0109] Unlike Example 8, the outer layer is made of the PVC material of Comparative Example 2.

[0110] Comparative Example 7

[0111] A PVC composite pipe is prepared by the following method:

[0112] Unlike Example 8, the outer layer is made of the PVC material of Comparative Example 3.

[0113] Comparative Example 8

[0114] A PVC composite pipe is prepared by the following method:

[0115] Unlike Example 8, the outer layer is made of the PVC material of Comparative Example 4.

[0116] Result detection

[0117] The relevant performance tests were conducted on the PVC materials and PVC composite pipes of the above embodiments and comparative examples:

[0118] (1) Physical and mechanical performance testing:

[0119] Mechanical property tests include density, tensile yield stress, and drop hammer impact test.

[0120] Density: The test standard is based on Method A in GB / T 1033.1-2008, requiring a density of 1350~1550 kg / cm³. 3 Tensile yield stress: The test standard shall be in accordance with GB / T 8804.2-2003, and the requirement shall be ≥40 MPa;

[0121] Drop hammer impact test: The pipe fitting test standard shall be in accordance with GB / T 14152-2001, with 25 tests, and the requirement is ≤10%. The sample pretreatment temperature shall be (0±1)℃, and the drop hammer mass and drop height shall comply with the provisions of Table 6 in GB / T 5836.1-2018.

[0122] Mechanical properties were tested under the following test conditions (a), (b), and (c):

[0123] Test conditions (a) Ambient temperature 23℃, humidity 50%;

[0124] Test conditions (b): -12℃ freezing for 12h, thawing at room temperature for 12h, repeated for 720h.

[0125] Test conditions (c): The test standard is in accordance with GB / T 14522-2008 "Artificial Climate Aging Test Method for Plastics, Coatings and Rubber Materials for Mechanical Industry Products". A UVA-340 light source was used, with each cycle lasting 12 hours. This included 8 hours of drying (irradiance at 340 nm: 0.76 W·m). -2 ·nm -1 Blackboard temperature 50℃); 0.25h water spray (irradiance 0.00-0.76W·m). -2 ·nm -1 (Blackboard temperature not controlled); 3.75h condensation (light source off, blackboard temperature 50℃), repeated for a total of 720h.

[0126] (2) Referring to the People's Republic of China Urban Construction Industry Standard CJ / T312-2009 "Noise Test Method for Building Drainage Pipeline System", the sound insulation effect of the drainage pipe made in this invention was tested using a two-story reverberation chamber (sound source chamber and receiving chamber, with an experimental wall in the middle). The net height of each test chamber was 3.5 m and the experimental wall was 4 m. The lower floor was the test chamber, which adopted various sound insulation and sound absorption measures. Then, the plastic drainage pipe made in this invention was arranged along the four corners of the test chamber. The water supply was provided by a variable frequency speed pump and an ultrasonic flow meter. The noise test was conducted using an NL-22 precision sound level meter with a range of 10 to 120 dB and a frequency range of 10 to 20000 Hz. The test method was a constant flow of water with a test flow rate of 1 to 3 L / s. The sound level meter probe was 1.2 m above the ground and 1 m above the pipe being tested. The peak decibel level of the noise emitted by each drainage pipe was measured.

[0127] (3) Referring to the People's Republic of China Light Industry Standard QB / T2591-2003 "Antibacterial Plastics - Evaluation and Test Methods of Antibacterial Performance", an antibacterial test for Escherichia coli was conducted. A 60*60mm antibacterial sample was prepared from PVC composite pipe. A film-applied method was used on the inner layer of the PVC composite pipe. The total number of colonies was counted according to the standard, and the antibacterial rate of the sample after 24 hours was further calculated. The formula for calculating the antibacterial rate is as follows:

[0128] Ar(%)=(AB) / A×100

[0129] Where: Ar - antibacterial rate, %;

[0130] A - Average recovered bacterial count of blank control sample, CFU / ml;

[0131] B - Average recovered bacterial count of antimicrobial pipe samples, CFU / ml.

[0132] The specific test results of the PVC materials in Examples 1-7 and Comparative Examples 1-4 are shown in Table 3 below:

[0133] Table 3

[0134]

[0135] The specific test results of the PVC composite pipes in Examples 8-10 and the PVC composite pipes in Comparative Examples 5-8 are shown in Table 4 below:

[0136] Table 4

[0137]

[0138] The results above show that

[0139] The PVC material of the present invention improves the cold resistance of PVC material through the synergistic effect of non-polar rubber, layered structural material and grafted maleic anhydride compatibilizer, and still has excellent tensile yield stress after freezing test.

[0140] The PVC composite pipe of the present invention has multiple functions such as antibacterial, anti-aging and noise reduction. Even after freezing treatment and ultraviolet radiation, it still has excellent performance. Compared with ordinary PVC, it can ensure long-term use in ultraviolet and cold environments, and its strength is less affected by temperature changes, which shows that the PVC composite pipe of the present invention has excellent aging resistance.

[0141] The PVC composite pipe prepared by this invention has significantly improved antibacterial properties due to the addition of quaternary phosphate antibacterial agent, with a sterilization rate of over 95% against Escherichia coli.

[0142] The PVC composite pipe prepared by the method of this invention has good noise reduction function. As can be seen from Examples 8-10, the peak noise level gradually decreases with the increase of powder B content. This may be because the increase of powder B content increases the foam porosity, and the denser the pores and the larger the specific surface area, the more it promotes noise absorption.

[0143] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A PVC material for PVC drain pipes, characterized in that, By weight, it comprises the following components: 100 parts PVC resin, 3-5 parts PVC stabilizer, 4-6 parts non-polar rubber, 2-4 parts layered structural material, 4-6 parts grafted maleic anhydride compatibilizer, 40-60 parts inorganic filler; and 0.5-1.5 parts polyphosphoric acid. The layered structural material is boron nitride or graphene; the non-polar rubber is one or more of butadiene rubber, natural rubber, EPDM rubber or butyl rubber.

2. The PVC material of claim 1, wherein, The grafted maleic anhydride compatibilizer is one or more of ABS-g-MAH, PE-g-MAH, PP-g-MAH, SMA, POE-g-MAH or EVA-g-MAH.

3. A PVC pipe, characterized in that, It is prepared from the PVC material described in claim 1 or 2.

4. A PVC composite pipe, characterized by It comprises, from the inside out, an inner layer, a core layer, and an outer layer, wherein the outer layer is made of the PVC material described in claim 1 or 2.

5. The PVC composite pipe as described in claim 4, characterized in that, The inner layer is made of an antibacterial material, which includes 100 parts of PVC resin, 3-5 parts of PVC stabilizer, 35-45 parts of quaternary phosphate salt, 0.5-1.5 parts of color masterbatch, and 4-8 parts of antioxidant.

6. The PVC composite pipe as described in claim 4, characterized in that, The core layer is prepared from foamed sound insulation material, which is made by foaming 60-80 parts of organic polymer and 3-5 parts of plant fiber through supercritical fluid.

7. The method for preparing the PVC composite pipe according to any one of claims 4 to 6, characterized in that, Includes the following steps: S1. Mix the inner layer materials, melt-extrude them at 180~220℃, and dry them to obtain inner layer masterbatch A; The core layer materials are mixed to obtain core layer material B; The outer layer material is mixed, melt-extruded at 180~220℃, and dried to obtain outer layer masterbatch C; S2. The inner layer masterbatch A, core layer material B and outer layer masterbatch C are added to a three-layer co-pressure extruder, kneaded at high temperature and then continuously extruded, cooled and shaped to obtain the PVC composite pipe.

8. The application of the PVC composite pipe according to any one of claims 4 to 6 in building drainage pipes.

Images