A polyvinyl chloride composite material and a method for producing the same

Abstract

The application discloses a polyvinyl chloride composite material and a preparation method thereof, and relates to the technical field of general plastics. The application provides a polyvinyl chloride composite material, which comprises the following components in parts by weight: polyvinyl chloride resin 30-50 parts, thermoplastic polyurethane elastomer 10-30 parts, polyvinyl chloride resin grafted with thermoplastic polyurethane 5-15 parts, talcum powder 10-25 parts, phenolic resin 5-15 parts, plasticizer 30-50 parts, and stabilizer 4-10 parts. The polyvinyl chloride resin has a polymerization degree of 1000-1800, the polyvinyl chloride resin grafted with thermoplastic polyurethane has a grafting amount of thermoplastic polyurethane of 10-25 mol%, and the phenolic resin has a softening point of 90-100 DEG C. The thermoplastic polyurethane elastomer, talcum powder, polyvinyl chloride resin grafted with corresponding thermoplastic polyurethane and phenolic resin system are introduced, so that vibration and noise can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of general plastics technology, and in particular to a polyvinyl chloride composite material and its preparation method. Background Technology

[0002] The rapid development of modern industrial automation has brought convenience to human life, but at the same time, the vibration and noise of automated equipment, as byproducts of industrial development, are increasingly causing harm to people's production and lives. Vibration and noise not only affect the service life and operational stability of equipment, but also cause serious damage to people's physical and mental health. Therefore, vibration reduction and noise reduction have become urgent problems to be solved for the long-term stable development of modern society and industry. In the field of engineering, many methods have been studied to solve the problem of vibration and noise pollution, and the use of damping vibration reduction materials is one of the most effective ways to reduce vibration and noise.

[0003] Polymer damping materials, due to their unique viscoelasticity, possess a specific glass transition temperature range. Near this temperature, polymeric materials can efficiently convert the energy of sound waves and mechanical vibrations into heat, exhibiting excellent damping characteristics. Polyvinyl chloride (PVC) is a general-purpose plastic, inexpensive, widely used, and produced in large quantities. It also boasts high mechanical strength, flame retardancy, good chemical corrosion resistance, and adjustable hardness. Its soft products exhibit rubber-like viscoelasticity, making it an ideal substitute for rubber. However, PVC suffers from high compression set, poor toughness, and low-temperature brittleness, which somewhat limits its applications. Under current technological conditions, PVC thermoplastic elastomers modified using rubber-plastic blends, plasticizers, stabilizers, fillers, and the addition of third components or small organic oligomers exhibit superior thermoplastic elastic properties, enabling the application of PVC thermoplastic elastomers as vibration damping and noise reduction materials. For example, patent CN 114479311 A discloses a damping material for the ribs of a Chinese human body dummy and its application. The authors prepared a composite material using polyvinyl chloride resin, a polar toughening agent, a polar plasticizer, graphite powder, a lubricant, a heat stabilizer, ethylene-vinyl acetate copolymer, and a density modifier, suitable for use in crash test dummies for Chinese human body characteristics, serving as the rib material for crash test dummies. However, the damping loss factor tanδ value of the prepared material is all below 0.3.

[0004] In summary, the development of a polyvinyl chloride composite material suitable for reducing vibration and noise, and its preparation method, has high application value. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a polyvinyl chloride composite material that can effectively reduce vibration and noise, and a method for preparing the same.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a polyvinyl chloride composite material, comprising the following components in parts by weight: 30-50 parts of polyvinyl chloride resin, 10-30 parts of thermoplastic polyurethane elastomer, 5-15 parts of polyvinyl chloride resin grafted with thermoplastic polyurethane, 10-25 parts of talc, 5-15 parts of phenolic resin, 30-50 parts of plasticizer, and 4-10 parts of stabilizer; wherein the degree of polymerization of the polyvinyl chloride resin is 1000-1800, the grafting amount of thermoplastic polyurethane in the polyvinyl chloride resin grafted with thermoplastic polyurethane is 10-25 mol%, and the softening point of the phenolic resin is 90-100℃.

[0007] The degree of polymerization of the polyvinyl chloride resin is tested according to GB / T5761-2006, general-purpose polyvinyl chloride resin by suspension method; the grafting amount of thermoplastic polyurethane in the grafted thermoplastic polyurethane polyvinyl chloride resin is tested by infrared spectroscopy, and the grafting rate is calculated by measuring the intensity of the characteristic peaks of the characteristic functional groups of the introduced thermoplastic polyurethane; the softening point of the phenolic resin is tested according to GB / T15332-94, determination of softening point of hot melt adhesives.

[0008] The inventors discovered that when the degree of polymerization of polyvinyl chloride (PVC) resin is too low, there are fewer entanglement points between molecular chains, making intermolecular slippage easier and resulting in poor damping properties. When the degree of polymerization of PVC resin is too high, the molecular chains become longer, increasing the number of entanglement points, which is beneficial for improving damping performance. However, excessively high polymerization leads to excessive viscosity in the composite system, causing uneven dispersion of talc and a decrease in the lamellar index when used with talc, thus preventing the formation of a synergistic promoting effect. When the degree of polymerization of PVC resin is within the range given in this invention, the effects of this invention can be achieved. Specifically, the degree of polymerization of the PVC resin in this invention can be 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, etc., and this invention is not limited to these. Thermoplastic polyurethane elastomer, abbreviated as TPU, is a linear block copolymer composed of soft and hard segments, with virtually no cross-linked structure in its molecules. The soft segments are composed of flexible long-chain polyols and isocyanates, which are very flexible and randomly coiled. The hard segments are composed of small-molecule diols or isocyanates and diamines, which extend into long rods at room temperature and are not easily altered in their conformation, allowing only small-range movement and reducing energy loss. The introduction of thermoplastic polyurethane-grafted polyvinyl chloride resin acts as a compatibilizer for PVC-TPU blending because the TPU grafted onto the PVC backbone. Simultaneously, the increased hard segment content of the grafted TPU, combined with the original TPU content, results in a higher density of crystalline units and microcrystalline regions, increasing the number of physical crosslinking points and leading to increased friction and internal energy loss. If the grafting rate of the PVC resin grafted with thermoplastic polyurethane is too low, it cannot provide good compatibility between PVC and TPU. If the grafting rate is too high, it will lead to poor thermal stability of the PVC resin grafted with thermoplastic polyurethane, thus affecting the processing stability of the entire composite system. When the grafting rate of the PVC resin grafted with thermoplastic polyurethane is within the range given in this invention, the effects of this invention can be achieved. Specifically, the grafting rate of the PVC resin grafted with thermoplastic polyurethane in this invention can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc., and this invention is not limited to these.

[0009] Talc is relatively difficult to disperse, while phenolic resin has certain viscosity and good heat resistance and high-temperature resistance, maintaining its structural integrity and dimensional stability even at very high temperatures. Thermoplastic phenolic resin facilitates the dispersion of talc filler throughout the polymer matrix. The softening point of phenolic resin at 90-100℃ allows for sufficient absorption of the plasticizer into the PVC resin matrix. If the softening point is too low, the low melting point during mixing will affect the plasticizer absorption of the PVC resin; if the softening point is too high, it cannot melt sufficiently and cannot be mixed evenly with the entire PVC matrix. When the softening point of the phenolic resin is within the range given in this invention, the effects of this invention can be achieved. Specifically, the softening point of the phenolic resin in this invention can be 90℃, 91℃, 92℃, 93℃, 94℃, 95℃, 96℃, 97℃, 98℃, 99℃, 100℃, etc., and this invention is not limited to these.

[0010] This invention introduces thermoplastic polyurethane elastomer, talc, and a corresponding thermoplastic polyurethane-grafted polyvinyl chloride resin and phenolic resin system into a polyvinyl chloride resin, plasticizer, and stabilizer system. This composite system can make the prepared polyvinyl chloride composite material have a maximum loss factor of over 0.75 and an effective damping temperature range of over 45°C.

[0011] Preferably, the polyvinyl chloride composite material comprises the following components in parts by weight: 35-45 parts of polyvinyl chloride resin, 15-20 parts of thermoplastic polyurethane elastomer, 10-12 parts of polyvinyl chloride resin grafted with thermoplastic polyurethane, 15-20 parts of talc, 8-10 parts of phenolic resin, 35-45 parts of plasticizer, and 4-10 parts of stabilizer.

[0012] When the above-mentioned components are used, the maximum loss factor of the prepared polyvinyl chloride composite material is above 0.85, and the effective damping temperature range is greater than 55℃.

[0013] Preferably, the talc powder has a lamellar index of 2-3.

[0014] The test method for the lamellar index of the talc is to calculate it as (d50 laser - d50 sedimentation) / d50 sedimentation, where d50 laser is tested according to GB / T 19077.1-particle size analysis-laser diffraction method, and d50 sedimentation is tested according to GB / T26645.1-2011-particle size analysis-liquid gravity sedimentation method.

[0015] The inventors discovered that the introduction of talc with a lamellar index of 2-3, due to its numerous lamellar structures, creates significant stress concentration points between PVC molecular chains. These lamellar structures, to a certain extent, restrict the movement of the PVC molecular chains, further reducing energy loss. However, if the lamellar index is too high, it indicates an excessively large aspect ratio of the particles. During injection molding, this leads to significant differences in the distribution of flow direction and perpendicular flow direction, resulting in uneven shrinkage in both the transverse and longitudinal directions, causing dimensional instability, and also affecting damping performance. If the lamellar index is too low, the lamellar structure cannot form effective micro-constraint damping units with the PVC, insufficiently increasing frictional resistance during molecular chain movement, and resulting in less than ideal damping performance. Specifically, when the lamellar index of talc is 2-3, the resulting PVC composite material has a maximum loss factor above 0.85 and an effective damping temperature range greater than 55℃, effectively reducing vibration and noise.

[0016] Preferably, the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer. For example, the polyester-type thermoplastic polyurethane elastomer is selected from at least one of TPU-KF70AG, TPU-KF80AG, and TPU-KF90AG.

[0017] The inventors discovered that when the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer, the resulting polyvinyl chloride composite material exhibits better vibration reduction and noise reduction effects. This is because the compatibility of the blend primarily stems from the soft segments of the thermoplastic polyurethane and the PVC chain segments. Since the affinity of the soft ester bonds in polyester-type thermoplastic polyurethane is greater than that of the ether bonds, polyester-type thermoplastic polyurethane elastomers are more suitable for blending with polyvinyl chloride.

[0018] Preferably, the plasticizer is at least one of dioctyl terephthalate and di(2-propylheptyl) phthalate; the stabilizer is at least one of calcium-zinc stabilizer, barium-zinc stabilizer, organotin stabilizer, and epoxidized soybean oil stabilizer.

[0019] Furthermore, the present invention provides a method for preparing the aforementioned polyvinyl chloride composite material, comprising the following steps:

[0020] (1) Weigh all raw materials according to the proportions;

[0021] (2) Mix polyvinyl chloride resin, plasticizer, and stabilizer evenly, and heat for the first time to obtain mixture A; mix mixture A, thermoplastic polyurethane elastomer, polyvinyl chloride resin grafted with thermoplastic polyurethane, talc powder, and phenolic resin evenly, and heat for the second time to obtain mixture B.

[0022] (3) The mixture B is added to a two-stage extruder for extrusion granulation to obtain the polyvinyl chloride composite material.

[0023] Preferably, in step (1), the temperature of the first heating is 80-110℃, and the temperature of the second heating is 120-130℃.

[0024] Preferably, in step (3), the twin-screw extrusion process is as follows: extrusion temperature: zone 1 100-110℃, zone 2 110-120℃, zone 3 120-130℃, zone 4 125-135℃, zone 5 130-140℃, zone 6 125-135℃, zone 7 105-115℃, zone 8 105-115℃, zone 9 105-115℃; screw speed is 400-450 rpm.

[0025] Furthermore, the present invention provides the application of the aforementioned polyvinyl chloride composite material in the manufacture of vibration damping and noise reduction equipment. Preferably, the present invention provides the application of the aforementioned polyvinyl chloride composite material in the manufacture of vibration damping and noise reduction equipment such as furniture, refrigerators, air conditioners, audio equipment, and computers.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: Based on the polyvinyl chloride resin, plasticizer, and stabilizer system, the present invention introduces thermoplastic polyurethane elastomer, talc powder, and a corresponding thermoplastic polyurethane-grafted polyvinyl chloride resin and phenolic resin system. This composite system can make the prepared polyvinyl chloride composite material have a maximum loss factor of more than 0.75 and an effective damping temperature range of more than 45°C, which can effectively reduce vibration and noise. Detailed Implementation

[0027] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0028] Unless otherwise specified, the experimental methods used in the embodiments are conventional methods, and the materials and reagents used are commercially available. The plasticizers and stabilizers used in the embodiments and comparative examples of this invention are exactly the same and are all conventional commercially available products.

[0029] The raw materials used in the embodiments and comparative examples are described below, but are not limited to these materials:

[0030] Polyvinyl chloride resin 1: Degree of polymerization 1000, PVC TL-1000, LG Korea;

[0031] Polyvinyl chloride resin 2: Degree of polymerization 1300, PVC TG-1300, Tosoh Corporation, Japan;

[0032] Polyvinyl chloride resin 3: Degree of polymerization 1800, PVC S-80, Formosa Plastics, Taiwan, China;

[0033] Polyvinyl chloride resin 4: Degree of polymerization 700, PVC TK-700, Shin-Etsu Chemical, Japan;

[0034] Polyvinyl chloride resin 5: Degree of polymerization 2500, PVC TK-2500LS, Shin-Etsu Chemical, Japan;

[0035] Thermoplastic polyurethane elastomer 1: Polyester-type thermoplastic polyurethane elastomer, TPU-KF70AG, Hong Yi, Taiwan, China;

[0036] Thermoplastic polyurethane elastomer 2: Polyether-type thermoplastic polyurethane elastomer, TPU-KF70AE, Hong Yi, Taiwan, China;

[0037] Grafted thermoplastic polyurethane polyvinyl chloride resin 1: The grafting amount of thermoplastic polyurethane is 10 mol%, PVC T-1000, Guangzhou Tengshun Chemical.

[0038] PVC resin 2 grafted with thermoplastic polyurethane: The grafting amount of thermoplastic polyurethane is 20 mol%, PVC C-1000, Formosa Plastics, Taiwan, China.

[0039] PVC resin 3 grafted with thermoplastic polyurethane: The grafting amount of thermoplastic polyurethane is 25 mol%, PVC T-2500, Guangzhou Tengshun Chemical.

[0040] PVC resin 4 grafted with thermoplastic polyurethane: The grafting amount of thermoplastic polyurethane is 5 mol%, PVC C-1800, Formosa Plastics, Taiwan, China.

[0041] PVC resin grafted with thermoplastic polyurethane 5: The grafting amount of thermoplastic polyurethane is 30 mol%, PVC T-2800, Guangzhou Tengshun Chemical.

[0042] Talc 1: Laminaria index is 2, HART 77, Imerys;

[0043] Talc 2: Laminaria index is 3, HAR 3G 77L, Imerys;

[0044] Talc 3: Laminaria index is 1.5, AH-3000KF, Beihai stone powder;

[0045] Talc 4: Laminaria index is 4, HART 84, Imerys;

[0046] Phenolic resin 1: softening point 90℃, R7521P, Saint-Lecter;

[0047] Phenolic resin 2: softening point is 100℃, P7510P, Saint-Lecter;

[0048] Phenolic resin 3: softening point is 85℃, SP-1068, Saint-Lecter;

[0049] Phenolic resin 4: softening point is 110℃, CRJ-418, Saint-Lecter;

[0050] Plasticizer: Dioctyl terephthalate, commercially available;

[0051] Stabilizer: Calcium-zinc stabilizer, RUP-108, commercially available.

[0052] Examples and Comparative Examples

[0053] The components and weight parts of the polyvinyl chloride composite materials in the examples and comparative examples are shown in Tables 1 and 2. The preparation methods of the polyvinyl chloride composite materials in the examples and comparative examples include the following steps:

[0054] (1) Weigh all raw materials according to the proportions;

[0055] (2) Mix polyvinyl chloride resin, plasticizer, and stabilizer evenly, and heat to 100°C for the first time to obtain mixture A; mix mixture A, thermoplastic polyurethane elastomer, polyvinyl chloride resin grafted with thermoplastic polyurethane, talc powder, and phenolic resin evenly, and heat to 120°C for the second time to obtain mixture B.

[0056] (3) The mixture B is added to a two-stage extruder for extrusion granulation to obtain the polyvinyl chloride composite material; wherein, the twin-screw extrusion process is as follows: extrusion temperature: zone 1 105℃, zone 2 115℃, zone 3 125℃, zone 4 130℃, zone 5 135℃, zone 6 130℃, zone 7 110℃, zone 8 110℃, zone 9 110℃; screw speed is 430 rpm.

[0057] Table 1

[0058]

[0059]

[0060] Table 2

[0061]

[0062] Table 3

[0063]

[0064]

[0065] Performance testing

[0066] Damping evaluation method: Dynamic mechanical performance test, using dynamic mechanical analyzer (DMA), test conditions: shear mode, heating rate 3℃ / min, frequency 10Hz, temperature range -50~100℃;

[0067] Maximum loss factor: In the process of damping evaluation, a damping (equivalent to the Y-axis) - temperature (equivalent to the X-axis) curve will be generated. The maximum value of the loss factor in the curve is the maximum loss factor.

[0068] Effective Damping Temperature Range: During the damping evaluation process, a damping (equivalent to the Y-axis) - temperature (equivalent to the X-axis) curve will eventually be generated. The process of determining the effective damping temperature range is as follows: First, draw a straight line parallel to the temperature axis at the point where the loss factor is 0.3. This straight line intersects the damping (equivalent to the Y-axis) - temperature (equivalent to the X-axis) curve at two points, namely the left intersection point and the right intersection point. Then, draw straight lines parallel to the damping axis through the left intersection point and the right intersection point respectively, intersecting the temperature axis to obtain two temperature values ​​when the loss factor is 0.3. The absolute value of the difference between these two temperature values ​​is the effective damping temperature range.

[0069] Materials measured:

[0070] 1) Maximum loss factor (tanδmax), tanδmax is preferably greater than 0.75;

[0071] 2) The effective damping temperature range is preferably greater than 45℃.

[0072] Test results are shown in Table 4-5.

[0073] Table 4

[0074]

[0075] Table 5

[0076]

[0077] As shown in the table above, this invention introduces thermoplastic polyurethane elastomer, high lamellar index talc, and corresponding thermoplastic polyurethane-grafted polyurethane and phenolic resin systems on the basis of polyvinyl chloride resin, plasticizer, and stabilizer system. This composite system can make the maximum loss factor of the prepared polyvinyl chloride composite material above 0.75 and the effective damping temperature range greater than 45℃, which can effectively reduce vibration and noise.

[0078] A comparison of Examples 1-3 and Comparative Examples 1-2 shows that when the degree of polymerization of the polyvinyl chloride resin is 1000-1800, the maximum loss factor of the prepared polyvinyl chloride composite material is above 0.75, and the effective damping temperature range is greater than 45℃, effectively reducing vibration and noise. A comparison of Examples 2 and 4 shows that when the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer, the prepared polyvinyl chloride composite material has a better effect on reducing vibration and noise. Since the compatibility of the blend mainly comes from the soft segments of the thermoplastic polyurethane and the PVC chain segments, the affinity of the soft ester bonds in polyester-type thermoplastic polyurethane is greater than that of the ether bonds, making polyester-type thermoplastic polyurethane elastomers more suitable for blending with polyvinyl chloride.

[0079] As can be seen from the comparison of Examples 2, 5-6 and Comparative Examples 3-4, when the amount of thermoplastic polyurethane grafted into the polyvinyl chloride resin is 10-25 mol%, the maximum loss factor of the prepared polyvinyl chloride composite material is above 0.75, the effective damping temperature range is greater than 45℃, and it can better reduce vibration and noise.

[0080] As can be seen from the comparison of Examples 2 and 7-9, when the talc powder has a lamellar index of 2-3, the polyvinyl chloride composite material prepared has a maximum loss factor of 0.85 or higher and an effective damping temperature range of 55°C or higher, which can better reduce vibration and noise.

[0081] As can be seen from the comparison of Examples 2, 10 and Comparative Examples 5-6, when the softening point of the phenolic resin is 90-100℃, the maximum loss factor of the polyvinyl chloride composite material prepared is above 0.85, and the effective damping temperature range is greater than 55℃, which can better reduce vibration and noise.

[0082] As can be seen from the comparison of Examples 2, 11-13 and Comparative Examples 7-8, when there are 35-45 parts of polyvinyl chloride resin, 15-20 parts of thermoplastic polyurethane elastomer, 10-12 parts of polyvinyl chloride resin grafted with thermoplastic polyurethane, 15-20 parts of talc, 8-10 parts of phenolic resin, 30-50 parts of plasticizer and 4-10 parts of stabilizer, vibration and noise can be reduced better.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyvinyl chloride composite material, characterized in that, The product comprises the following components in parts by weight: 35-50 parts of polyvinyl chloride resin, 10-30 parts of thermoplastic polyurethane elastomer, 5-15 parts of polyvinyl chloride resin grafted with thermoplastic polyurethane, 10-25 parts of talc, 5-15 parts of phenolic resin, 30-50 parts of plasticizer, and 4-10 parts of stabilizer; wherein the degree of polymerization of the polyvinyl chloride resin is 1000-1800, the grafting amount of thermoplastic polyurethane in the polyvinyl chloride resin grafted with thermoplastic polyurethane is 10-25 mol%, and the softening point of the phenolic resin is 90-100℃. The talc powder has a lamellar index of 2-3; The test method for the talc's lamellar index is based on (d50 laser) The calculation is based on d50 settlement / d50 settlement, where d50 laser is calculated according to GB / T 19077.

1. Particle size analysis Laser diffraction was used for testing, and the d50 sedimentation was measured according to GB / T 26645.

1. 2011 Particle size analysis The test was conducted using the liquid gravity sedimentation method.

2. The polyvinyl chloride composite material as described in claim 1, characterized in that, It includes the following components in parts by weight: 35-45 parts of polyvinyl chloride resin, 15-20 parts of thermoplastic polyurethane elastomer, 10-12 parts of polyvinyl chloride resin grafted with thermoplastic polyurethane, 15-20 parts of talc, 8-10 parts of phenolic resin, 30-50 parts of plasticizer, and 4-10 parts of stabilizer.

3. The polyvinyl chloride composite material as described in claim 1, characterized in that, The thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer.

4. The polyvinyl chloride composite material as described in claim 1, characterized in that, The plasticizer is at least one of dioctyl terephthalate and di(2-propylheptyl) phthalate; the stabilizer is at least one of calcium-zinc stabilizer, barium-zinc stabilizer, organotin stabilizer, and epoxidized soybean oil stabilizer.

5. A method for preparing a polyvinyl chloride composite material as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Weigh all raw materials according to the proportions; (2) Mix polyvinyl chloride resin, plasticizer, and stabilizer evenly, and heat for the first time to obtain mixture A; mix mixture A, thermoplastic polyurethane elastomer, polyvinyl chloride resin grafted with thermoplastic polyurethane, talc powder, and phenolic resin evenly, and heat for the second time to obtain mixture B; (3) The mixture B is added to a two-stage extruder for extrusion granulation to obtain the polyvinyl chloride composite material.

6. The method for preparing the polyvinyl chloride composite material as described in claim 5, characterized in that, In step (1), the temperature of the first heating is 80-110℃, the temperature of the second heating is 120-130℃, and the screw speed is 400-450 rpm.

7. The application of a polyvinyl chloride composite material as described in any one of claims 1-4 in the preparation of vibration reduction and noise reduction equipment.

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