Composition for vinyl record, preparation method thereof and vinyl record

Abstract

The invention belongs to the field of record preparation, and particularly relates to a composition for a vinyl record, a preparation method of the composition and the vinyl record. The composition for the vinyl record is prepared from the following components in parts by weight: 45 to 55 parts of vinyl chloride-vinyl acetate copolymer, 35 to 45 parts of polyvinyl chloride, 2 to 4 parts of plasticizer, 1 to 3 parts of flexibilizer, 0.3 to 1 part of heat stabilizer, 0.5 to 1 part of filler and 0.2 to 0.6 part of lubricant. The invention also discloses a preparation method of the composition. The preparation method comprises the steps of mixing, melting and plasticizing, pelletizing and post-processing. By adopting a double-resin composite system, the balance of rigidity and toughness of the material is effectively realized, so that the prepared vinyl record has excellent physical properties, high-fidelity tone quality and long service life.

Description

Technical Field

[0001] The invention belongs to the field of record preparation, and in particular relates to a composition for vinyl records, a preparation method thereof, and a vinyl record. Background Art

[0002] As a classic music medium, the sound quality and durability of vinyl records directly depend on the physical properties of the materials they are made of. In the prior art, the materials used to manufacture vinyl records usually adopt a single resin system, such as vinyl chloride-vinyl acetate copolymer as the base resin, supplemented with additives such as plasticizers and stabilizers. However, this single resin system has inherent defects in performance, namely that it is difficult to simultaneously take into account the rigidity and toughness of the material. In order to ensure the stability of the record sound pattern during the pressing and playback process, the material needs to have a high rigidity, but this often leads to insufficient toughness, making the record brittle and easily damaged by scratches or impacts. Conversely, if the formula is adjusted to improve toughness, the rigidity of the material will be sacrificed, which may cause the sound pattern to undergo slight deformation during playback, thereby affecting the fidelity of the sound and reducing the sound quality. Therefore, the existing vinyl record materials still need to be improved in terms of comprehensive physical properties, acoustic quality and service life, and cannot fully meet the market demand for high-fidelity, long-life vinyl records.

[0003] Therefore, based on this, the technical solution of the present invention is proposed. Summary of the Invention

[0004] The purpose of this application is to provide a composition for vinyl records, a preparation method thereof and a vinyl record, aiming to overcome the technical problems in the prior art caused by the use of a single resin system, such as the difficulty in balancing the rigidity and toughness of the material, poor overall performance, and thus affecting the sound quality and service life.

[0005] At the same time, in order to solve the problems existing in the prior art, the present invention provides a composition for vinyl records, which includes the following raw materials in parts by weight: 45-55 parts of vinyl chloride-vinyl acetate copolymer, 35-45 parts of polyvinyl chloride, 2-4 parts of plasticizer, 1-3 parts of toughening agent, 0.3-1 part of thermal stabilizer, 0.5-1 part of filler and 0.2-0.6 part of lubricant.

[0006] Preferably, the composition for vinyl records comprises the following raw materials in parts by weight: 50 parts of vinyl chloride-vinyl acetate copolymer, 40 parts of polyvinyl chloride, 3 parts of plasticizer, 2 parts of toughening agent, 0.5 parts of heat stabilizer, 0.8 parts of filler and 0.4 parts of lubricant.

[0007] Preferably, the composition for vinyl records further comprises 0.1 to 3 parts by weight of a colorant.

[0008] Preferably, the plasticizer is chlorinated paraffin or dioctyl phthalate.

[0009] Preferably, the toughening agent is a polyvinyl chloride impact toughening modifier or MBS resin.

[0010] Preferably, the heat stabilizer is methyltin mercaptan or a calcium zinc composite stabilizer.

[0011] Preferably, the filler is calcium carbonate or talc.

[0012] Preferably, the lubricant includes an external lubricant and an internal lubricant.

[0013] Based on the same technical concept, the present invention further provides a method for preparing a composition for vinyl records, the method comprising the following steps: (1) Mixing: Put the raw material components of the vinyl record composition into a mixing device and stir at 75-90°C to obtain a mixed material; (2) Melting and plasticizing: feeding the mixed material into a granulator and performing melt plasticization at a temperature of 120-160°C to form a uniform melt; (3) pelletizing: the uniform melt is extruded from the die head of the pelletizer and cut into pellets by a pelletizer; (4) Post-processing: cooling and screening the particles.

[0014] Based on the same technical concept, another solution of the present invention is to provide a vinyl record, wherein the vinyl record is made of the composition for vinyl records.

[0015] The beneficial effects of the present invention are: This application adopts a dual resin system of vinyl chloride-vinyl acetate copolymer and polyvinyl chloride, combined with various additives in specific proportions, to effectively achieve a balance between the rigidity and toughness of the material, so that the vinyl record produced has both sufficient hardness to ensure the stability of the sound pattern and good toughness to resist impact and scratches, thereby significantly extending the service life.

[0016] At the same time, because the record substrate made from the composition of this application has superior physical stability and rigidity, it can more accurately replicate the sound pattern details of the master disc during record pressing and effectively resist stylus wear and pressure deformation during playback, thereby ensuring high fidelity of the sound signal and improving sound quality. Furthermore, the composition formula and preparation process parameters of this application have been optimized to ensure good thermal stability and fluidity during processing, facilitate uniform melt plasticization and high-quality granulation, and achieve a high product qualification rate, making it suitable for industrial production. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0018] Example 1 This example discloses a composition for vinyl records. This composition utilizes a dual-resin composite system and a precise blend of various functional additives to systematically enhance the overall physical and acoustic properties of the resulting vinyl record. This composition specifically strives to achieve an ideal balance between rigidity and toughness, ensuring high-fidelity reproduction of the record's sound pattern and long-term durability.

[0019] In this embodiment, the composition for vinyl records includes: 50 kg of vinyl chloride-vinyl acetate copolymer, 40 kg of polyvinyl chloride, 3 kg of plasticizer, 2 kg of toughening agent, 0.5 kg of heat stabilizer, 0.8 kg of filler, 0.4 kg of lubricant, and 1 kg of colorant.

[0020] The method for preparing the composition for vinyl records comprises the following steps: (1) Mixing step: Put all the components accurately weighed according to the above mass, namely 50 kg of vinyl chloride-vinyl acetate copolymer resin powder, 40 kg of polyvinyl chloride resin powder, 3 kg of liquid chlorinated paraffin, 2 kg of polyvinyl chloride impact toughening modifier powder, 0.5 kg of liquid methyl tin mercaptan, 0.8 kg of calcium carbonate powder, 0.2 kg of internal lubricant, 0.2 kg of external lubricant and 1 kg of carbon black powder, into a high-speed stirring mixer. Start the mixer and use the high-speed rotation of the blades to cause the materials to roll, collide and rub violently in the container. At the same time, the temperature in the mixer is controlled at 80°C by heating the jacket or using the heat generated by the friction of the materials themselves. This temperature is higher than the glass transition temperature of the base resin, which helps the liquid additive to be better absorbed and dispersed by the resin powder. Continue high-speed stirring for about 10 minutes until all the components are evenly mixed in the macro and micro aspects to form a dry blend with uniform appearance, color and texture.

[0021] (2) Melting and plasticizing step: The mixed material discharged from the high-speed stirring mixer is continuously and evenly fed into the feed port of the twin-screw granulator through a conveying device such as a screw feeder. The barrel of the twin-screw granulator is divided into multiple heating zones to implement segmented temperature control, thereby achieving precise control of the material melting and plasticizing process. In this embodiment, the temperature of each section of the barrel from the feed zone to the die zone can be set to 120°C, 135°C, 150°C, and 140°C in sequence. After the material enters the barrel, it is gradually compacted, melted, and plasticized under the shearing, extrusion, and mixing action of the two intermeshing screws rotating in the same or opposite directions. Among them, the lower feed zone temperature (120°C) is conducive to the smooth transportation and exhaust of the material, the higher temperature in the middle zone (135°C-150°C) ensures the full melting of the resin and the uniform dispersion of the additives, and the appropriate reduction of the die zone temperature (140°C) is to increase the melt strength and ensure the shape stability of the extruded strips. After the entire barrel stroke, the original powdered mixture is transformed into a viscous, uniform melt.

[0022] (3) Pelletizing step: The fully plasticized homogeneous melt is extruded through the die head at the end of the twin-screw pelletizer to form several strips of uniform diameter. After leaving the die head, these hot strips are immediately fed into the pelletizer. The high-speed rotating blades of the pelletizer accurately cut the strips into pellets of a preset size, for example, a cylindrical shape with a length of about 3 mm and a diameter of about 2.5 mm. It is understood that this step can adopt a water-cooled pelletizing method, that is, the strips are cooled by water flow while or before being cut to prevent the pellets from sticking.

[0023] (4) Post-processing step: The particles cut from the pelletizer are still at a relatively high temperature and need to be fully cooled and screened. The particles first enter the air cooling system. Under the action of strong airflow, the heat on the surface and inside is quickly taken away, and the temperature quickly drops to room temperature or close to room temperature. The cooled particles are then transported to the vibrating screen. The vibrating screen has a screen with a specific aperture. Through high-frequency vibration, it can effectively separate particles that are too large or too small, as well as a small amount of powder generated during processing and transportation, and only retain finished particles of qualified size. These qualified particles are the composite particles for vinyl records finally obtained in this embodiment, which can be packaged and stored for use in the pressing production of vinyl records.

[0024] The preparation method of the vinyl record is as follows: In actual production, the prepared granular material (composition particles for vinyl records) is precisely weighed to a specific weight (e.g., 180g) and placed in the mold of a vinyl record press. Pressing is performed under high temperature (e.g., 160°C) and high pressure (e.g., 100 tons) to melt the composition particles and completely fill the mold cavity formed by a metal master disc engraved with fine grooves. After cooling and demolding, a complete vinyl record is obtained. The main body of the record, the record substrate, is composed entirely of the composition of this example. Its surface precisely replicates the microscopic spiral groove structure of the master disc, known as the sound pattern. Because the composition of this example possesses an excellent balance of rigidity and toughness, dimensional stability, and wear resistance, the resulting record substrate provides an extremely stable support platform for the sound pattern, ensuring that the sound pattern is resistant to wear and deformation during repeated playback, thereby achieving high-fidelity sound reproduction and a longer service life.

[0025] Furthermore, in order to facilitate understanding of the present invention, the role of raw materials is described using Example 1 as an example: Specifically, the base resin system of the vinyl record composition is a compound of two high-molecular-weight polymers: vinyl chloride-vinyl acetate copolymer and polyvinyl chloride. The vinyl chloride-vinyl acetate copolymer serves as the first base resin. The vinyl acetate monomer introduced into its molecular chain disrupts the regular molecular structure of polyvinyl chloride, thereby reducing intermolecular forces and endowing the copolymer with a low melting temperature and excellent melt flow. In this formulation, 50 kg of this copolymer primarily ensures excellent processing properties during the subsequent melt-plasticization and press-molding processes, enabling smooth filling of the mold's minute details and laying the foundation for accurate replication of the sound pattern structure on the master disc.

[0026] Correspondingly, polyvinyl chloride, as the second base resin, has a relatively regular molecular chain structure and has a high glass transition temperature and mechanical strength. The core purpose of adding 40kg of polyvinyl chloride to this formula is to significantly improve the rigidity, hardness and wear resistance of the composition after curing. This high rigidity is crucial for vinyl records. It can effectively resist the pressure exerted by the stylus during playback and prevent slight deformation of the sound pattern, thereby ensuring high fidelity of the sound signal during the pickup process. By compounding 50kg of vinyl chloride-vinyl acetate copolymer with 40kg of polyvinyl chloride, a synergistic dual-resin network structure is formed, which not only utilizes the processing fluidity of the former, but also introduces the structural rigidity of the latter, successfully solving the technical problem that traditional single resin systems are difficult to balance rigidity and toughness.

[0027] In order to further optimize the performance of the dual resin system, this embodiment also introduces a variety of functional additives.

[0028] In this embodiment, the plasticizer can be chlorinated paraffin, added in an amount of 3 kg. As an auxiliary plasticizer, chlorinated paraffin can intercalate between polymer chains, weakening intermolecular van der Waals forces, thereby increasing the mobility of the polymer chains, reducing the melt viscosity of the material, further improving processing fluidity, and imparting a certain degree of flexibility to the final product. It should be noted that the 3 kg addition amount has been optimized to be sufficient to assist plasticization without excessively weakening the final rigidity of the material.

[0029] In this embodiment, the toughening agent can be a polyvinyl chloride impact toughening modifier, added in an amount of 2 kg. This type of modifier typically has a unique core-shell or network structure, capable of forming a microscopic dispersed phase within the resin matrix. When the material is subjected to external impact, these dispersed toughening agent particles act as stress concentration points, inducing a large number of silver streaks and shear bands, thereby absorbing and dissipating the impact energy and effectively preventing the propagation of cracks. This makes the produced vinyl record less prone to brittle fracture when accidentally dropped or scratched by hard objects, significantly improving its durability and service life.

[0030] In this embodiment, a highly efficient methyltin mercaptan stabilizer can be used as the thermal stabilizer, with an addition amount of 0.5 kg. Polyvinyl chloride and its copolymers are highly sensitive to heat during high-temperature processing (e.g., melt-plasticization processes at 120°C to 160°C), and are prone to dehydrochlorination degradation reactions, resulting in discoloration and a sharp decline in mechanical properties. Methyltin mercaptan effectively captures dislodged hydrogen chloride radicals and replaces unstable allylic chlorine atoms, thereby inhibiting the degradation chain reaction. This ensures thermal stability throughout the entire processing process and guarantees uniform and reliable performance in the final product.

[0031] In this embodiment, calcium carbonate can be used as the filler, with an addition amount of 0.8 kg. As an inorganic filler, calcium carbonate not only reduces costs but, more importantly, can adjust the physical properties of the material. An appropriate amount of calcium carbonate can improve the hardness, heat resistance, and dimensional stability of the composition, while also reducing molding shrinkage. This plays a positive role in ensuring the precise dimensions and flatness of vinyl records after pressing.

[0032] In this embodiment, the lubricant can be a composite system of internal and external lubrication, with a total addition amount of 0.4 kg. Specifically, the composite system can include 0.2 kg of internal lubricant (e.g., stearate) and 0.2 kg of external lubricant (e.g., polyethylene wax). Internal lubricants have good compatibility with the resin and function to reduce internal friction between polymer molecular chains to improve melt fluidity. External lubricants, on the other hand, have poor compatibility with the resin and tend to migrate to the melt surface during processing, forming a thin lubricating layer. This layer reduces external friction between the melt and the metal surfaces of processing equipment (e.g., screw, barrel, die head), preventing melt adhesion, ensuring a smooth extrusion process, and improving the surface finish of the final pellets.

[0033] In this embodiment, the colorant can be carbon black, with an addition amount of 1 kg. Carbon black not only gives vinyl records their classic appearance, but its tiny particles can also play a certain role in shielding ultraviolet rays, delaying the aging of the material due to light exposure.

[0034] Example 2 As the second embodiment of the present invention, it is intended to illustrate that within the scope of the technical concept of the present invention, the types of plasticizers and toughening agents are not limited to a single type, and other materials with different chemical structures but similar functions can also achieve the technical objectives of this application. The composition formula and preparation method of this embodiment are basically the same as those of Example 1, with the main difference being the selection of the plasticizer and toughening agent.

[0035] In this embodiment, a composition for vinyl records includes the following components: 55 kg of vinyl chloride-vinyl acetate copolymer, 35 kg of polyvinyl chloride, 2 kg of plasticizer, 3 kg of toughening agent, 1 kg of heat stabilizer, 1 kg of filler, and 0.6 kg of lubricant.

[0036] It should be noted that in this embodiment, the ratio of the two base resins is adjusted to 55:35, which is still within the required range, and the proportion of the flexible component is slightly increased.

[0037] The key difference between this embodiment and embodiment 1 is that: The plasticizer used was dioctyl phthalate, added in an amount of 2 kg. As a typical primary plasticizer, dioctyl phthalate has excellent compatibility with polyvinyl chloride resins and exhibits higher plasticizing efficiency than the chlorinated paraffin used in Example 1. Therefore, even with only 2 kg added, the resin's melt temperature and melt viscosity were effectively lowered, improving processing performance. Furthermore, the final product was given the necessary flexibility, preventing it from becoming too rigid and brittle.

[0038] MBS resin is selected as the toughening agent, and its addition amount is 3kg. MBS resin is a terpolymer of methyl methacrylate, butadiene and styrene, and is a typical high-efficiency core-shell structure impact modifier. Its "core" is usually rubbery polybutadiene to provide toughness, and its "shell" is a glassy polymethyl methacrylate-styrene copolymer to ensure its compatibility with the polyvinyl chloride matrix. When the material is impacted, the rubber core can effectively absorb and disperse energy. 3kg of MBS resin can significantly improve the impact strength of the composition, and its toughening effect is very significant, which plays the same function as the polyvinyl chloride impact toughening modifier in Example 1.

[0039] The amounts of other additives, such as heat stabilizer (methyltin mercaptan, 1 kg), filler (calcium carbonate, 1 kg), and lubricant (a compound of 0.3 kg of internal lubricant and 0.3 kg of external lubricant, totaling 0.6 kg) were adjusted within the required range to match the new resin and additive system.

[0040] The preparation method for the composition of this example is identical to that of Example 1, including the following (briefly described): mixing, melt-plasticization, pelletizing, and post-processing steps. The equipment used is the same as in Example 1: a high-speed stirring mixer, a twin-screw pelletizer, a pelletizer, an air-cooling system, and a vibrating screen. It should be noted that during the melt-plasticization step, process parameters such as the twin-screw pelletizer barrel temperature can be fine-tuned within the range of 120-160°C based on the actual rheological properties of the formulation to achieve optimal plasticization.

[0041] Finally, the vinyl record substrate pressed using the pellets produced in this example also exhibited excellent physical properties and acoustic quality. These results demonstrate that the use of dioctyl phthalate as a plasticizer and MBS resin as a toughening agent is entirely feasible and can successfully achieve the technical benefits of the present invention: balanced rigidity and toughness, high fidelity, and long life.

[0042] Example 3 This example is intended to further demonstrate the flexibility and wide applicability of the technical solution of the present invention, and mainly verifies that different types of thermal stabilizers and fillers can also play their due roles in the formulation system of the present application and achieve the expected technical effects.

[0043] In this embodiment, a composition for vinyl records includes the following components: 45 kg of vinyl chloride-vinyl acetate copolymer, 45 kg of polyvinyl chloride, 4 kg of plasticizer, 1 kg of toughening agent, 0.8 kg of heat stabilizer, 0.5 kg of filler, and 0.2 kg of lubricant.

[0044] In this formulation, the ratio of the two base resins is adjusted to 45:45, reaching the upper limit of the rigid component, polyvinyl chloride, to create a highly rigid matrix. To balance this high rigidity, the plasticizer (chlorinated paraffin) dosage is increased to 4 kg, while the toughening agent (polyvinyl chloride impact modifier) ​​is reduced to 1 kg, keeping all component dosages within the required range.

[0045] The core changes of this embodiment are: The heat stabilizer used is a calcium-zinc composite stabilizer, and its addition amount is 0.8 kg. The calcium-zinc composite stabilizer is an environmentally friendly heat stabilizer. Its mechanism of action is to quickly capture hydrogen chloride and replace unstable chlorine atoms through zinc soap (such as zinc stearate) to provide initial stability, while calcium soap (such as calcium stearate) provides long-term heat stability. Although its monomer efficiency may not be as good as that of organotin stabilizers, through compounding technology, its comprehensive performance is sufficient to meet the heat stability requirements of this application at a processing temperature of 120°C-160°C. The use of calcium-zinc composite stabilizer instead of methyltin mercaptan proves the compatibility of the formulation system of this application with different types of stabilizers.

[0046] The filler used was ultrafine talc, added in an amount of 0.5 kg. Talc is a silicate mineral filler with a flaky structure. Compared to the granular calcium carbonate in Example 1, flaky talc can act as a reinforcement and nucleation agent in the resin matrix. It not only improves the material's rigidity and heat resistance, but also its flexural modulus and dimensional stability, resulting in a smoother pressed record substrate and more accurate reproduction of the sound pattern. 0.5 kg of ultrafine talc is sufficient to achieve the aforementioned modification effects.

[0047] The preparation method and equipment used in this example are the same as those in Example 1. Specifically, in the mixing step, the above components are uniformly mixed in a high-speed stirring mixer at 75°C-90°C. In the melt-plasticizing step, the mixture is plasticized into a uniform melt in a twin-screw pelletizer at 120°C-160°C. The subsequent pelletizing and post-processing steps are also consistent with the previous example.

[0048] The vinyl record produced in this example was tested to have good thermal stability, showed no signs of degradation during processing, and had precise dimensions and stable physical properties. This fully demonstrates that the solution of using a calcium-zinc composite stabilizer and ultrafine talc is entirely feasible and can also achieve the objectives of the present invention.

[0049] Example 4 As another optional implementation method, this embodiment aims to verify that within the scope of protection of this application, different types of lubrication systems can also meet the processing requirements and achieve the invention purpose of this application, so as to support the definition of the technical feature of "lubricant".

[0050] In this embodiment, a composition for vinyl records includes: 52 kg of vinyl chloride-vinyl acetate copolymer, 38 kg of polyvinyl chloride, 3.5 kg of plasticizer (chlorinated paraffin), 1.5 kg of toughening agent (polyvinyl chloride impact toughening modifier), 0.7 kg of thermal stabilizer (methyl tin mercaptan), and 0.7 kg of filler (calcium carbonate).

[0051] The unique feature of this embodiment is the choice of lubricant. Here, a compound of stearic acid and polyethylene wax is used as the lubricant, with a total addition amount of 0.6 kg. This compound replaces the method of adding internal and external lubricants separately in Examples 1 and 2.

[0052] Specifically, stearic acid is a classic lubricant that has both internal and external lubrication functions in polyvinyl chloride formulas, but it mainly acts as an internal lubricant, which can reduce the friction between polymer molecules and promote uniform melt plasticization. Polyethylene wax is a typical external lubricant with poor compatibility with polyvinyl chloride. During processing, it easily migrates to the interface between the melt and the metal to form a lubricating layer, effectively preventing adhesion, improving the demoulding effect and the surface finish of the product. Pre-compounding these two substances or adding them together in the mixing step can form a fully functional lubrication system. The total addition amount of 0.6kg ensures that the material has excellent fluidity and anti-adhesion properties throughout the entire processing process, from melt plasticization to extrusion and pelletizing.

[0053] The preparation method for the composition of this example is identical to that of the previous example. After mixing in a high-speed stirring mixer, the materials enter a twin-screw granulator for melt plasticization, with the barrel temperature maintained between 120°C and 160°C. Practice has demonstrated that when the composition using this composite lubricant is processed in a twin-screw granulator, the melt flows smoothly, torque is stable, and the extruded strands have a smooth surface with no adhesion. After processing in a pelletizer, air cooling system, and vibrating screen, the resulting granules have a high surface finish and a regular morphology.

[0054] The vinyl records pressed using the granular material of this embodiment have a smooth and flawless surface and clear, sharp sound patterns. This demonstrates that the composite lubricant solution can also meet processing requirements and help produce a high-quality final product, thereby achieving the purpose of the present invention.

[0055] Through the aforementioned multiple embodiments, the present invention elaborates in detail, from various perspectives, a composition for vinyl records and its preparation method. These embodiments collectively demonstrate that by utilizing a dual-resin system of vinyl chloride-vinyl acetate copolymer and polyvinyl chloride, combined with a plasticizer, toughening agent, thermal stabilizer, filler, and lubricant within a specific range, the existing problem of balancing rigidity and toughness in vinyl record materials can be effectively resolved, thereby producing a vinyl record with excellent physical properties, high sound fidelity, and a long service life.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A composition for vinyl records, characterized in that: The invention comprises the following raw materials in parts by weight: 45-55 parts of vinyl chloride-vinyl acetate copolymer, 35-45 parts of polyvinyl chloride, 2-4 parts of plasticizer, 1-3 parts of toughening agent, 0.3-1 parts of heat stabilizer, 0.5-1 parts of filler and 0.2-0.6 parts of lubricant.

2. The composition for vinyl records according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 50 parts of vinyl chloride-vinyl acetate copolymer, 40 parts of polyvinyl chloride, 3 parts of plasticizer, 2 parts of toughening agent, 0.5 parts of heat stabilizer, 0.8 parts of filler and 0.4 parts of lubricant.

3. The composition for vinyl records according to claim 1 or 2, characterized in that: It also includes 0.1 to 3 parts by weight of a colorant.

4. The composition for vinyl records according to claim 1 or 2, characterized in that: The plasticizer is chlorinated paraffin or dioctyl phthalate.

5. The composition for vinyl records according to claim 1 or 2, characterized in that: The toughening agent is a polyvinyl chloride impact toughening modifier or MBS resin.

6. The composition for vinyl records according to claim 1 or 2, characterized in that: The heat stabilizer is methyltin mercaptan or a calcium zinc composite stabilizer.

7. The composition for vinyl records according to claim 1 or 2, characterized in that: The filler is calcium carbonate or talc.

8. The composition for vinyl records according to claim 1 or 2, characterized in that: The lubricant includes an external lubricant and an internal lubricant.

9. The method for preparing the composition for vinyl records according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: (1) Mixing: Put the raw material components of the vinyl record composition into a mixing device and stir at 75-90°C to obtain a mixed material; (2) Melting and plasticizing: feeding the mixed material into a granulator and performing melt plasticization at a temperature of 120-160°C to form a uniform melt; (3) pelletizing: the uniform melt is extruded from the die head of the pelletizer and cut into pellets by a pelletizer; (4) Post-processing: cooling and screening the particles.

10. A vinyl record, characterized in that: The vinyl record is made from the composition for vinyl records according to any one of claims 1 to 8.