High-gloss, flame-retardant, and impact-resistant sheet and its polyvinyl chloride composition

Abstract

This invention provides a high-gloss, flame-retardant, and impact-resistant sheet manufactured from a polyvinyl chloride composition. [Solution] The polyvinyl chloride composition comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride raw material composition includes a polyvinyl chloride raw material and a chlorinated polyvinyl chloride raw material, and the content ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material (weight ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material) is 5.66:1 to 1.5:1. Therefore, the high-gloss flame-retardant and impact-resistant sheet has a glossiness of 90 GU or higher at 60 degrees, a fire spread index (FPI) of less than 6, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm under conditions of a thickness of 3 mm to 5 mm.

Description

Technical Field

[0001] The present invention relates to a plastic sheet material, and particularly to a high-gloss flame-retardant and impact-resistant sheet and its polyvinyl chloride composition.

Background Art

[0002] Polyvinyl chloride (PVC) has excellent properties such as flame retardancy, chemical resistance, transparency, mechanical strength, electrical insulation, and processability, and is one of the most widely used plastic raw materials, which can be used in the manufacture of films, sheets, pipes, wires, etc.

[0003] However, many of the plasticizers contained in PVC products are flammable. When PVC products burn, a large amount of smoke is generated, making it difficult to escape and rescue. As the application of PVC materials continues to expand in semiconductor factories and electronics factories, etc., for example, if it is impossible to effectively prevent combustion and suppress smoke by the ceiling and partition boards of clean rooms, process, airflow control, and ventilation facilities, once a fire occurs, it may cause significant damage due to the spread of fire and a large amount of harmful smoke at the site. Therefore, how to improve the flame retardancy and smoke suppression performance of PVC products has become an issue attracting attention in the industry.

[0004] Conventional technologies add flame retardants and smoke suppressants to PVC materials, which have certain flame retardant effects and smoke suppression effects, but there are often problems such as the reduction of the processability of the materials and the mechanical properties of the products, and the products cannot meet the requirements for the glossiness of the appearance in the actual applications.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The concept of this invention is to use polyvinyl chloride raw material (PVC) and chlorinated polyvinyl chloride raw material (CPVC) in a specific ratio, and to add a carbon-forming agent that produces a synergistic effect and an inorganic additive that improves flame retardancy and mechanical properties to the resulting PVC / CPVC mixture, thereby producing a sheet material that possesses properties such as high gloss, high mechanical strength, high flame retardancy, and low smoke emission.

[0006] The technical problem that this invention aims to solve is to provide a high-gloss, flame-retardant, and impact-resistant sheet and a polyvinyl chloride composition thereof, in order to address the shortcomings of the prior art. [Means for solving the problem]

[0007] To solve the aforementioned technical problems, one of the technical means employed by the present invention is to provide a polyvinyl chloride composition for manufacturing a high-gloss, flame-retardant, and impact-resistant sheet. The polyvinyl chloride composition comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride raw material composition comprises a polyvinyl chloride raw material and a chlorinated polyvinyl chloride raw material, and the content ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material (weight ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material) is 5.66:1 to 1.5:1. Therefore, the aforementioned high-gloss flame-retardant and impact-resistant sheet has a glossiness of 90 GU or higher at 60 degrees, a fire spread index (FPI) of less than 6, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm, under conditions of a thickness of 3 mm to 5 mm.

[0008] In an implementable or preferred embodiment of the present invention, the at least one inorganic additive is a compound of at least one inorganic flame retardant, at least one inorganic reinforcing agent, and at least one inorganic auxiliary agent.

[0009] In an implementable or preferred embodiment of the present invention, the at least one inorganic flame retardant, the at least one inorganic reinforcing agent, and the at least one inorganic auxiliary agent are each one or more combinations of inorganic substances consisting of titanium dioxide, titanium-rich powder, talc powder, calcium carbonate, silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, calcium silicate, calcium sulfate whiskers, hydrotalcite, kaolin, silica fume, mica, and barium sulfate, and the at least one inorganic flame retardant, the at least one inorganic reinforcing agent, and the at least one inorganic auxiliary agent are each different.

[0010] In an implementable or preferred embodiment of the present invention, the at least one inorganic additive is a compound of titanium dioxide, silicon dioxide, aluminum hydroxide, calcium sulfate whiskers, and calcium carbonate, in descending order of content.

[0011] In an implementable or preferred embodiment of the present invention, the at least one carbon-forming agent is selected from the group consisting of phosphate esters, phosphazene compounds, ammonium polyphosphate, melamine, dicyandiamide, hydrotalcite, and zinc oxide.

[0012] In an implementable or preferred embodiment of the present invention, the at least one heat stabilizer is selected from the group consisting of organotin, metal soap, and lead salt.

[0013] In an implementable or preferred embodiment of the present invention, the polyvinyl chloride composition further comprises 2.5 to 6 parts by weight of at least one impact-resistant modifier.

[0014] In an implementable or preferred embodiment of the present invention, the at least one impact modifier is selected from the group consisting of methyl methacrylate-butadiene-styrene copolymer (MBS), acrylic acid ester copolymer, ethylene-vinyl acetate copolymer (EVA), and styrene-ethylene-butylene-styrene copolymer (SEBS).

[0015] In an implementable or preferred embodiment of the present invention, the polyvinyl chloride composition comprises at least one processing aid, the processing aid comprising a plasticizer, a lubricant, a gelling accelerator, a colorant, an antioxidant, and / or an ultraviolet absorber.

[0016] To solve the above technical problems, another technical means employed by the present invention is to provide a high-gloss, flame-retardant, and impact-resistant sheet manufactured from the polyvinyl chloride composition. The high-gloss, flame-retardant, and impact-resistant sheet has a glossiness of 90 GU or higher at 60 degrees, a fire spread index (FPI) of less than 6 under the FM4910 standard under conditions of a thickness of 3 mm to 5 mm, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm.

[0017] In an implementable or preferred embodiment of the present invention, the tensile strength of the high-gloss, flame-retardant, and impact-resistant sheet is 500 kg / cm². 2 That's all. [Effects of the Invention]

[0018] Overall, the polyvinyl chloride composition according to the present invention comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride raw material composition includes a polyvinyl chloride raw material and a chlorinated polyvinyl chloride raw material, and the content ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material (weight ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material) is 5.66:1 to 1.5:1. The sheet material produced from the polyvinyl chloride composition has high gloss and high mechanical strength, and can achieve a low fire spread index (FPI) and low smoke index (SDI) based on the FM4910 standard with a thickness of only 3 mm to 5 mm, thereby significantly reducing losses due to fire and making it suitable for semiconductor factories and high-end electronics factories. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic flowchart of the method for manufacturing a high-gloss, flame-retardant, and impact-resistant sheet according to the present invention. [Modes for carrying out the invention]

[0020] To further understand the features and technical details of this invention, please refer to the following detailed description of the invention and the accompanying drawings. However, the accompanying drawings provided are for reference and illustrative purposes only and do not limit the scope of the claims of this invention.

[0021] The following describes how the "high-gloss, flame-retardant, and impact-resistant sheet and its polyvinyl chloride composition" according to the present invention can be implemented by specific embodiments, and those skilled in the art will be able to understand the advantages and effects of the present invention based on the content disclosed herein. The present invention can be implemented or applied by other different specific embodiments, and various modifications and changes can be made to each detail herein, based on different viewpoints and applications, as long as they do not deviate from the concept of the present invention. It should be noted in advance that the accompanying drawings of the present invention are for simple schematic explanation and are not drawn to actual size. The following describes the technical content of the present invention in more detail based on embodiments, but the scope of protection of the present invention is not limited by the content disclosed.

[0022] It should be understood that while this specification may use terms such as “first,” “second,” and “third” to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another, or one signal from another. Furthermore, the term “or” as used herein may, depending on the context, include any one or more of the items listed in relation to the subject.

[0023] Unless otherwise specified, the terms used in the present invention have meanings generally understood by those skilled in the art. The materials used in the following embodiments are commercially available materials or materials manufactured by the prior art unless otherwise specified. The methods or operations used in the following examples are common methods or operations in the technical field unless otherwise specified.

[0024] The present invention provides a polyvinyl chloride composition. The polyvinyl chloride composition mainly comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride composition of the present invention is suitable as a material for an impact-resistant sheet material, and can not only impart high flame retardancy, low smoke generation, high mechanical strength, etc. to the sheet material, but also enhance the glossiness of the sheet material surface and show the effect of brightening. When actually applied, the sheet material manufactured from the polyvinyl chloride composition of the present invention can be applied to the mechanism of a clean room, such as the ceiling and partition plates of a clean room, and process, air flow control, and ventilation equipment.

[0025] [Polyvinyl chloride raw material composition] In the polyvinyl chloride composition of the present invention, the polyvinyl chloride raw material composition includes a polyvinyl chloride raw material (PVC) and a chlorinated polyvinyl chloride raw material (CPVC). That is, the polyvinyl chloride raw material composition is a PVC / CPVC mixed system. The polyvinyl chloride raw material and the chlorinated polyvinyl chloride raw material exist in powder form, and their content ratio may be 5.66:1 to 1.5:1, and preferably 3:1 to 1.85:1. Therefore, the product (for example, a sheet material) of the polyvinyl chloride composition of the present invention has a relatively high fire resistance limit and a low possibility of burning out by a high-temperature flame.

[0026] The inventors simulated the UL-94 5V test method and conducted fire resistance tests on samples of the PVC / CPVC mixed sheet material according to the present invention, a pure PVC sheet material, and a pure CPVC sheet material. The flame temperature was 835°C and the flame height was 3 cm. The results showed that the flame burn-out time for the PVC / CPVC mixed sheet material sample according to the present invention exceeded 650 seconds, which is superior to the flame burn-out time of 314 seconds for the pure PVC sheet material sample and 211 seconds for the pure CPVC sheet material sample.

[0027] In actual application, the total amount of polyvinyl chloride raw material and chlorinated polyvinyl chloride raw material added is 100 parts by weight. The polyvinyl chloride raw material and chlorinated polyvinyl chloride raw material can be commercially available or prepared by methods known in the art or disclosed in the literature. The average degree of polymerization of the polyvinyl chloride raw material may be in the range of 740 to 1000 and the chlorine content may be in the range of 55% to 59%, while the average degree of polymerization of the chlorinated polyvinyl chloride raw material may be in the range of 400 to 850 and the chlorine content may be in the range of 63% to 68%.

[0028] It should be noted that if the content ratio of polyvinyl chloride (PVC) raw material in the PVC raw material composition is too high, the PVC composition product, such as sheet material, will not reach a sufficient chlorine content, and the flame retardancy of the PVC raw material will decrease. If the content ratio of PVC raw material in the PVC raw material composition is too low, it will adversely affect the thermal stability of the PVC composition and reduce its gloss.

[0029] [Inorganic additives] In the polyvinyl chloride composition of the present invention, at least one inorganic additive is used to improve the overall performance of products such as sheet materials, particularly in terms of flame retardancy and mechanical strength, while simultaneously achieving a certain degree of gloss. The at least one inorganic additive is a composite inorganic additive, which may consist of at least one inorganic flame retardant, at least one inorganic reinforcing agent, and at least one inorganic auxiliary agent. The inorganic auxiliary agent alone does not necessarily have the effect of increasing flame retardancy and mechanical strength, but a synergistic effect is produced when used in combination with the inorganic flame retardant and / or inorganic reinforcing agent. Alternatively, the inorganic auxiliary agent may bring about a synergistic effect on other properties such as optical properties, but the present invention is not limited to the above examples.

[0030] In an implementable embodiment of the present invention, the at least one inorganic flame retardant, the at least one inorganic strengthening agent, and the at least one inorganic auxiliary agent are each a combination of one or more inorganic substances consisting of titanium dioxide, titanium-rich powder, talc powder, calcium carbonate, silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, calcium silicate, calcium sulfate whiskers, hydrotalcite, kaolin, silica fume, mica, and barium sulfate, and the at least one inorganic flame retardant, the at least one inorganic strengthening agent, and the at least one inorganic auxiliary agent are each different. In a preferred embodiment of the present invention, the at least one inorganic additive is a compound of titanium dioxide, silicon dioxide, aluminum hydroxide, calcium sulfate whiskers, and calcium carbonate, in descending order of content.

[0031] In a feasible embodiment of the present invention, the content of at least one inorganic additive in the polyvinyl chloride composition may be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition.

[0032] It should be noted that if the inorganic additive content exceeds 15 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition, the mechanical strength decreases, making it difficult to meet actual applications. If the inorganic additive content is less than 3 parts by weight of the polyvinyl chloride raw material composition per 100 parts by weight, the flame retardancy deteriorates, making it impossible to effectively suppress the spread of fire. Furthermore, in the case of the composite inorganic additive of the present invention, if the number of added inorganic substances is less than three (for example, one or two of the three types of inorganic flame retardants, inorganic strengtheners, and inorganic auxiliary agents are missing), it becomes difficult to achieve both flame retardancy and mechanical strength.

[0033] [Carbon forming agent] In the polyvinyl chloride composition of the present invention, at least one carbon-forming agent is used to promote the carbonization of the PVC / CPVC mixed system. Due to the rapid growth rate and high strength of carbon particles during the carbonization process, when products such as sheet materials are exposed to flames or high heat, a dense and strong carbon barrier layer is formed on the surface, making them resistant to ignition and fire spread. Even if ignition occurs, the amount of smoke generated is small, achieving a level that meets the certification standards of FM4910. The at least one carbon-forming agent may be selected from the group consisting of phosphate esters, phosphazene compounds, ammonium polyphosphate, melamine, dicyandiamide, hydrotalcite, and zinc oxide, or a combination of multiple types may be used.

[0034] It is worth noting that, in the PVC / CPVC mixed system of the present invention, even if the carbon-forming agent content is greater than 0.5 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition, the increase in flame retardant effect due to carbon formation is not very significant. If the carbon-forming agent content is less than 0.1 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition, the carbon formation characteristics are poor, the carbon layer becomes less dense, the product burns out easily, and smoke generation cannot be effectively suppressed.

[0035] In a feasible embodiment of the present invention, the content of at least one carbon-forming agent in the polyvinyl chloride composition may be 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, or 1 part by weight, per 100 parts by weight of the polyvinyl chloride raw material composition. Notably, since the carbon-forming agent exhibits a flame-retardant effect synergistically with the raw material composition of polyvinyl chloride, a low content can be maintained, and there is no need to add a separate flame retardant.

[0036] [Heat stabilizer] In the polyvinyl chloride composition of the present invention, the polyvinyl chloride raw material composition uses at least one heat stabilizer to prevent yellowing, embrittlement, and deterioration of physical properties due to thermal decomposition during the processing process. The at least one heat stabilizer may be selected from the group consisting of organotin (such as thiol organotin), metal soap (calcium zinc stabilizer), and lead salt, or multiple types may be combined.

[0037] In a feasible embodiment of the present invention, the content of at least one heat stabilizer in the polyvinyl chloride composition may be 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, or 5 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition. Notably, the carbon-forming agent also plays a role in heat stabilization, and a synergistic effect with the heat stabilizer is obtained, allowing the content of the heat stabilizer to be kept low.

[0038] [Impact-resistant modifier] The polyvinyl chloride composition of the present invention may further contain at least one impact-resistant modifier to improve the toughness and impact resistance (particularly impact resistance in low-temperature environments) of products such as sealing materials. The at least one impact-resistant modifier may be selected from the group consisting of methyl methacrylate-butadiene-styrene copolymer (MBS), acrylic acid ester copolymer, ethylene-vinyl acetate copolymer (EVA), and styrene-ethylene-butylene-styrene copolymer (SEBS), or a combination of multiple types. The content of at least one impact-resistant modifier in the polyvinyl chloride composition is 2.5 to 6 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition.

[0039] In a feasible embodiment of the present invention, the content of at least one impact modifier in the polyvinyl chloride composition may be 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, or 6 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition.

[0040] [Processing aid] The polyvinyl chloride composition of the present invention may further contain at least one processing aid. The type and amount of the processing aid can be adjusted depending on the application, and the processing aid may be, for example, a plasticizer, a slip agent, a gelling accelerator, a colorant, an antioxidant, an ultraviolet absorber, and / or a flow aid, but the present invention is not limited thereto. Furthermore, the content of at least one processing aid in the polyvinyl chloride composition is 4 to 10 parts by weight per 100 parts by weight of the polyvinyl chloride raw material composition, but the present invention is not limited thereto.

[0041] In a feasible embodiment of the present invention, to meet the needs of continuous production, at least one processing aid may simultaneously contain a plasticizer, a lubricant, a gelling accelerator, a colorant, an antioxidant, an ultraviolet absorber, and a flow aid. In a polyvinyl chloride composition, per 100 parts by weight of the polyvinyl chloride raw material composition, the content of the plasticizer may be 0.1 to 2 parts by weight, the content of the lubricant may be 0.3 to 5 parts by weight, the content of the gelling accelerator may be 0.2 to 1 part by weight, the content of the colorant may be 0.01 to 0.6 parts by weight, the content of the antioxidant may be 0.5 to 1.6 parts by weight, the content of the ultraviolet absorber may be 0.4 to 1.5 parts by weight, and the content of the flow aid may be 0.5 to 5 parts by weight.

[0042] [High-gloss, flame-retardant, and impact-resistant sheet] The present invention provides a high-gloss, flame-retardant, and impact-resistant sheet manufactured from the polyvinyl chloride composition described above. The high-gloss, flame-retardant, and impact-resistant sheet according to the present invention is manufactured from a polyvinyl chloride composition, has a glossiness of 90 GU or higher at 60 degrees, a fire spread index (FPI) of less than 6 under the FM4910 standard under conditions of a thickness of 3 mm to 5 mm, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm.

[0043] As shown in Figure 1, the high-gloss, flame-retardant, and impact-resistant sheet of the present invention can be manufactured by employing a rolling and molding process that includes a step S1 of mixing polyvinyl chloride compositions, a step S2 of melting and plasticizing the mixed polyvinyl chloride compositions and then extruding them, and a step S3 of rolling and molding the resulting extruded material.

[0044] In step S1, the vinyl chloride raw material composition is used as the main component, and other components such as carbon forming agents, heat stabilizers, impact modifiers, and processing aids are mixed according to their respective proportions. In a feasible embodiment of the present invention, the main composition and the other compositions can be mixed sequentially using a hot mixer and a cold mixer.

[0045] In step S2, the mixed polyvinyl chloride composition is heated, melted, and plasticized, and then extruded to a melt at a temperature of 140°C to 200°C.

[0046] In step S3, the extruded material obtained in step S2 may be fed into a rolling mill and heated rollers may be used to form a sheet material of a certain thickness (for example, 3 mm to 5 mm).

[0047] [Examples and Comparative Examples] In the polyvinyl chloride composition of Example 1, the content ratio of polyvinyl chloride raw material and chlorinated polyvinyl chloride raw material in the polyvinyl chloride raw material composition is approximately 2.3:1, which falls within the range of 5.66:1 to 1.5:1 described in the present invention. Furthermore, the content of components such as carbon forming agents, heat stabilizers, impact modifiers, and processing aids also falls within the range described in the present invention. In addition, Example 1 employs a composite inorganic additive, which is composed of titanium dioxide, silicon dioxide, aluminum hydroxide, calcium sulfate whiskers, and calcium carbonate, in descending order of content.

[0048] The differences between Comparative Examples 1 and 2 and Example 1 are that in the polyvinyl chloride composition of Comparative Example 1, the content ratio of polyvinyl chloride raw material to chlorinated polyvinyl chloride raw material in the polyvinyl chloride raw material composition is approximately 6.14:1, which is outside the upper limit of the ratio (5.66:1) described in the present invention, and in the polyvinyl chloride composition of Comparative Example 2, the content ratio of polyvinyl chloride raw material to chlorinated polyvinyl chloride raw material in the polyvinyl chloride raw material composition is approximately 1.44:1, which is also outside the lower limit of the ratio (1.5:1) described in the present invention.

[0049] The difference between Comparative Examples 3 and 4 and Example 1 is that the content of the composite inorganic additive in the polyvinyl chloride composition of Comparative Example 3 is less than the lower limit of the content (3 parts by weight) described in the present invention, while the content of the composite inorganic additive in the polyvinyl chloride composition of Comparative Example 4 is greater than the upper limit of the content (15 parts by weight) described in the present invention.

[0050] The difference between Comparative Example 5 and Example 1 is that the polyvinyl chloride composition of Comparative Example 5 used fewer than three types of inorganic substances in the composite inorganic additive.

[0051] Sheet-like samples with a thickness of 5 mm were prepared using the polyvinyl chloride compositions of Example 1 and Comparative Examples 1 to 4 by following steps S1 to S3 shown in Figure 1, and the mechanical strength, flame retardancy, and optical properties of each sheet-like sample were measured. The measurement method is as follows, and the measurement results are summarized in Tables 1 and 2 below.

[0052] Tensile strength: Tensile tests were conducted on the sample sheet material in accordance with the ASTM D638 standard, and the tensile strength was measured.

[0053] Impact Strength: In accordance with the ASTM D256 standard, an Izod impact test was conducted on the test sheet material to measure its impact strength.

[0054] According to the Fire Propagation Index (FPI) standard FM4910, a specific index was obtained based on the flame propagation of the measured sheet material at a specific ignition energy.

[0055] Smoke Damage Index (SDI): According to the FM4910 standard, a specific index was obtained based on the smoke output of the measured sheet material at a specific ignition energy.

[0056] 60-degree gloss level: In accordance with the ASTM D523 standard, the gloss level was measured on the measurement sheet material, and the unit was Gloss Unit (GU).

[0057] [Table 1]

[0058] [Table 2]

[0059] Comparing Example 1 with Comparative Examples 1 and 2, it was found that when the content ratio of polyvinyl chloride raw material to chlorinated polyvinyl chloride raw material in the polyvinyl chloride raw material composition was within the range of 5.66:1 to 1.5:1 described in the present invention, the obtained sheet material not only achieved flame retardancy that met the FM4910 standard, but also retained a certain degree of gloss on the surface of the sheet material. If the content ratio of polyvinyl chloride raw material was too high, the FPI of the sheet material could not be achieved to 6 or less, and if the content ratio of polyvinyl chloride raw material was too low, the 60-degree gloss of the sheet material could not reach 90 GU.

[0060] Comparing Example 1 with Comparative Examples 3 and 4, it was found that combining three or more inorganic substances is advantageous in improving the overall performance of the sheet material, and the resulting sheet material can meet the expected levels of flame retardancy, mechanical strength, and glossiness. The ratio of inorganic additives in the polyvinyl chloride composition is undesirable if it is too low or too high. If the proportion of inorganic additives is too low, flame retardancy will be impaired, while if the proportion of inorganic additives is too high, mechanical strength and glossiness will be impaired. Furthermore, comparing Example 1 with Comparative Example 5, it was found that when fewer than three types of inorganic substances are used, even with sufficient additions, the resulting sheet material does not reach the desired level of mechanical strength or glossiness.

[0061] [Advantageous effects of the embodiment] One of the advantageous effects of the present invention is that the polyvinyl chloride composition according to the present invention comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer, wherein the polyvinyl chloride raw material composition includes a polyvinyl chloride raw material and a chlorinated polyvinyl chloride raw material, and the content ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material (weight ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material) is 5.66:1 to 1.5:1. The manufactured sheet material has high gloss and high mechanical strength, and can achieve a low fire spread index (FPI) and low smoke index (SDI) risk based on the FM4910 standard with a thickness of only 3 mm to 5 mm, thereby significantly reducing losses due to fire, making it suitable for semiconductor factories and high-end electronics factories.

[0062] The information disclosed above represents only preferred and implementable embodiments of the present invention, and the claims of the present invention are not limited thereto. Therefore, any equivalent technical modifications made using the description and drawings of the present invention are all included within the scope of the claims of the present invention. [Explanation of Symbols]

[0063] S1, S2, S3...manufacturing process

Claims

1. A polyvinyl chloride composition for manufacturing a glossy, flame-retardant, and impact-resistant sheet, The polyvinyl chloride composition comprises 100 parts by weight of a polyvinyl chloride raw material composition, 3 to 15 parts by weight of at least one inorganic additive, 0.1 to 0.5 parts by weight of at least one carbon-forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride raw material composition includes polyvinyl chloride raw material and chlorinated polyvinyl chloride raw material, and the content ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material (weight ratio of the polyvinyl chloride raw material to the chlorinated polyvinyl chloride raw material) is 5.66:1 to 1.5:

1. The aforementioned high-gloss flame-retardant and impact-resistant sheet is a polyvinyl chloride composition characterized by having a gloss level of 90 GU or higher at 60 degrees, a fire spread index (FPI) of less than 6, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm, under conditions of a thickness of 3 mm to 5 mm.

2. The polyvinyl chloride composition according to claim 1, wherein the at least one inorganic additive is a compound of at least one inorganic flame retardant, at least one inorganic reinforcing agent, and at least one inorganic auxiliary agent.

3. The polyvinyl chloride composition according to claim 2, wherein the at least one inorganic flame retardant, the at least one inorganic reinforcing agent, and the at least one inorganic auxiliary agent are each a combination of one or more inorganic substances consisting of titanium dioxide, titanium-rich powder, talc powder, calcium carbonate, silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide, calcium silicate, calcium sulfate whiskers, hydrotalcite, kaolin, silica fume, mica, and barium sulfate, and the at least one inorganic flame retardant, the at least one inorganic reinforcing agent, and the at least one inorganic auxiliary agent are each different.

4. The polyvinyl chloride composition according to claim 3, wherein the at least one inorganic additive is a composite of titanium dioxide, silicon dioxide, aluminum hydroxide, calcium sulfate whiskers, and calcium carbonate, in order of decreasing content.

5. The polyvinyl chloride composition according to claim 1, wherein the at least one carbon-forming agent is selected from the group consisting of phosphate esters, phosphazene compounds, ammonium polyphosphate, melamine, dicyandiamide, hydrotalcite, and zinc oxide.

6. The polyvinyl chloride composition according to claim 1, wherein the at least one heat stabilizer is selected from the group consisting of organotin, metal soap, and lead salt.

7. The polyvinyl chloride composition according to claim 1, further comprising 2.5 to 6 parts by weight of at least one impact-resistant modifier.

8. The polyvinyl chloride composition according to claim 7, wherein the at least one impact-resistant modifier is selected from the group consisting of methyl methacrylate-butadiene-styrene copolymer (MBS), acrylic acid ester copolymer, ethylene-vinyl acetate copolymer (EVA), and styrene-ethylene-butylene-styrene copolymer (SEBS).

9. The polyvinyl chloride composition according to claim 1, wherein the polyvinyl chloride composition comprises at least one processing aid, the processing aid comprising a plasticizer, a lubricant, a gelling accelerator, a colorant, an antioxidant, and / or an ultraviolet absorber.

10. A high-gloss flame-retardant and impact-resistant sheet manufactured from a polyvinyl chloride composition according to any one of claims 1 to 9, wherein the high-gloss flame-retardant and impact-resistant sheet is characterized in that it has a glossiness of 90 GU or more at 60 degrees, a fire spread index (FPI) of less than 6 under the FM4910 standard under conditions of a thickness of 3 mm to 5 mm, a smoke index (SDI) of less than 0.4, and an impact strength exceeding 3 kg-cm / cm.

11. The tensile strength of the aforementioned high-gloss, flame-retardant, and impact-resistant sheet is 500 kg / cm². ２ The above describes the high-gloss, flame-retardant, and impact-resistant sheet according to claim 10.

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