Resin composition comprising fiber material and secondary battery container for electric vehicles using same

Abstract

The present invention provides a resin composition comprising polypropylene (PP), talc (TALC), silicone (SY), and polyolefin-based plastomer (POP). In addition, the present invention provides a molded product manufactured from the resin composition, and the molded product has excellent scratch resistance and thus can be applied to various fields such as secondary battery containers for electric vehicles.

Description

Resin composition including fiber material and secondary battery container for electric vehicles using the same

[0001] The present invention relates to a resin composition with excellent scratch resistance, and more specifically, to a polyolefin resin composition that can be applied to a film for protecting a product exposed to frequent friction.

[0002]

[0003] Polypropylene-based synthetic resins are widely used in various industrial fields due to their excellent moldability, durability, chemical resistance, and cost-effectiveness. In particular, they are frequently used to manufacture parts where durability and lightweighting are critical in the automotive industry, home appliances, electronic devices, and packaging materials. However, polypropylene resins developed to date have a problem where their surfaces are relatively easily scratched or damaged, making it a critical task to improve scratch resistance in products exposed to frequent friction.

[0004] Conventional technologies for improving the scratch resistance of polyolefin resin compositions mainly consist of techniques for blending silicone resins and oils into a composition made of polypropylene and inorganic fillers, and techniques for blending polyester resins into polypropylene. These silicone resins and oil-based materials have many disadvantages, such as causing gas and staining problems in injection-molded and extruded products.

[0005]

[0006] The inventors of the present invention completed the present invention by conducting research to solve the problems of the prior art and discovering that when a composition is prepared by mixing polypropylene resin, talc, silicone, and a polyolefin-based plastomer, it has excellent scratch resistance and is suitable for use in secondary battery containers for electric vehicles where a lot of friction occurs.

[0007] Therefore, the objective of the present invention is to provide a polyolefin resin composition with excellent scratch resistance that can be applied in various fields, such as exterior materials like unpainted bumpers of automobiles, interior materials like door trims, instrument panels and console boxes, home appliances, electrical cables, and secondary battery containers for electric vehicles.

[0008] However, the technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0009]

[0010] Various embodiments of the present invention are described with reference to the drawings. In the following description, for a complete understanding of the present invention, various specific details, such as specific forms, compositions, and processes, are described. However, specific embodiments may be practiced without one or more of these specific details, or in combination with other known methods and forms. In other examples, known processes and manufacturing techniques are not described as specific details so as not to make the present invention unnecessary or obscure. Reference throughout this specification to one embodiment implies that a particular feature, form, composition, or characteristic described in association with the embodiment is included in one or more embodiments of the present invention. Accordingly, the circumstances of an embodiment expressed at various locations throughout this specification do not necessarily represent the same embodiment of the present invention. Additionally, a particular feature, form, composition, or characteristic may be combined in any suitable way in one or more embodiments.

[0011]

[0012] In this invention, the term 'polypropylene (PP)' refers to a plastic material synthesized using propylene obtained from petroleum as a raw material, similar to polyethylene. Polypropylene is manufactured through a polymerization reaction that links propylene molecules to form a long-chain polymer, and a Ziegler-Natta catalyst is used in this process. Furthermore, by using a catalyst to induce the polymerization reaction under low-pressure conditions, the molecular structure of polypropylene can be maintained consistently, thereby enabling the production of polypropylene with excellent durability and thermal stability. In this invention, polypropylene is used as the base material for the fabric; however, when used alone, particles are easily generated due to friction, impact, etc.

[0013] In this invention, the term 'Homo Polypropylene' refers to polypropylene polymerized using only a single type of propylene monomer. Homo Polypropylene is applied in various fields due to its excellent strength, heat resistance, and chemical resistance, as well as its ease of processing.

[0014] In this invention, the term 'propylene' refers to a gaseous hydrocarbon compound obtainable from petrochemical processes and is a raw material widely used in plastic manufacturing.

[0015] In this invention, the term "inorganic filler" refers to an inorganic-based material in the form of powder or particles that is added to a polymer resin or composite material to improve the physical, mechanical, and thermal properties of the material.

[0016] The above inorganic filler may be any one of talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay, and carbon black, though it is not limited thereto.

[0017] In the present invention, the term 'Talc' refers to a silicate mineral containing magnesium and is also called talc. Its chemical formula is H2Mg3(SiO3)4, and it is easily broken into a fine powder form. It is mainly white to gray in color and has a soft texture. It has the lowest hardness (1) according to the Mohs hardness scale and is added to plastics, rubber, paints, etc. to improve the strength, thermal stability, and scratch resistance of the product. In the present invention, talc is added as an inorganic component for the purpose of strengthening the strength of the fabric, and it was confirmed that moldability deteriorates when added in an amount exceeding a certain level.

[0018] In this invention, the term "calcium carbonate" refers to a white substance formed when carbonate ions and calcium ions meet; it does not dissolve well in water and precipitates in aqueous solutions. It is widely used in PVC or polyolefin resins for cost reduction and improved dimensional stability.

[0019] In the present invention, the term 'calcium sulfate' refers to a calcium sulfate, which is a white crystal that occurs naturally as gypsum, but can be artificially obtained as a precipitate by adding sulfuric acid or an aqueous sulfate solution to an aqueous calcium salt solution. It is mainly used as a building material or plastic filler and plays a role in increasing strength and dimensional stability.

[0020] In this invention, the term 'magnesium oxide' is used as a flame-retardant material or a high-temperature electrical insulator due to its excellent heat resistance and fire resistance, which provide stability in high-temperature environments.

[0021] In this invention, the term 'calcium stearate' is used as a lubricant and processing aid in plastics and rubber, and contributes to reducing friction on the product surface and improving processability.

[0022] In the present invention, the term 'willastonite' refers to a fibrous inorganic filler that increases strength and dimensional stability, reduces thermal deformation, and improves the heat resistance of composite materials.

[0023] In the present invention, the term 'mica' refers to a filler having a thin plate-like structure that can enhance the heat resistance and electrical insulation of plastics and improve the gloss of the surface.

[0024] In the present invention, the term 'silica' improves wear resistance and strength, and is used as a filler for rubber and plastic to enhance physical properties and increase the durability of the product.

[0025] In the present invention, the term 'calcium silicate' refers to calcium silicate and is a white powder. Calcium silicate has excellent heat resistance and fire resistance, so it is used as an insulating material and a flame-retardant material, and provides stable performance even in high-temperature environments.

[0026] In the present invention, the term 'clay' refers to soft soil with small particle sizes, specifically soil with a particle diameter of 0.002 mm or less. Clay is used as a reinforcing agent and filler to increase strength and dimensional stability, and to improve the heat resistance and durability of plastics and rubber.

[0027] In this invention, the term 'carbon black' refers to soot, which is produced by the incomplete combustion of carbon-based compounds. Carbon black provides strong pigments and electrical conductivity, and contributes to enhancing the weather resistance and UV resistance of tires and wire sheathings.

[0028] In the present invention, the term 'siloxane compound' refers to a compound containing Si-O-Si bonds in which silicon (Si) and oxygen (O) atoms are repeatedly connected. These compounds exhibit various physical properties in which organic groups (e.g., methyl, phenyl, etc.) are mainly bonded to silicon atoms, and they are used for various applications such as cosmetics, medical devices, insulating materials for electronic devices, lubricants, and coatings due to their excellent high-temperature stability, chemical resistance, water repellency, and flexibility.

[0029] Although not limited thereto, the above siloxane-based compound may be any one of polydimethylsiloxane, hexamethyldisiloxane, cyclomethicone, methylphenylsiloxane, polytrimethylsiloxane, and silicone.

[0030] In this invention, the term 'Polydimethylsiloxane (PDMS)' refers to a type of silicone polymer that is widely used in medical devices, cosmetics, and insulating materials for electronic devices due to its excellent flexibility and transparency, as well as its superior heat and chemical resistance.

[0031] In the present invention, the term 'hexamethyldisiloxane (HMDS)' is a volatile low-molecular-weight siloxane that provides water repellency and is used in semiconductor surface coating agents, cosmetic ingredients, etc., and is also utilized as a pretreatment agent for coating or adhesion.

[0032] In this invention, the term 'Cyclomethicone' refers to a cyclic siloxane primarily used in cosmetics, which provides a light and smooth spreadability on the skin.

[0033] In the present invention, the term 'methylphenylsiloxane' refers to a siloxane containing a phenyl group, which has excellent high-temperature stability and is used as a high-temperature lubricant or insulating oil, and is suitable for applications requiring heat resistance.

[0034] In this invention, the term 'Polytrimethylsiloxane' refers to a silicone polymer with high water repellency and lubricity, which is utilized in coatings, waterproofing agents, etc., and serves to protect surfaces and reduce friction.

[0035] In this invention, the term 'silicone' refers to a polymer based on the bonding of silicon and oxygen. When dichlorodimethylsilane is synthesized by reacting methyl chloride (CH3Cl) with silicon in crystalline form and then hydrolyzed, siloxane bonds (...-Si-O-Si-O-...) are formed. Various types of polymers are possible depending on the polymerization method. Silicon is a colorless, odorless, slow-oxidizing, and stable insulator even at high temperatures. In this invention, silicon is added to suppress particle generation by reducing frictional force when friction occurs between products. However, there is a problem in that if added beyond a certain level, it leaches out to the product surface, causing the silicon component to transfer color to the product it comes into contact with.

[0036] In the present invention, the term 'polyolefin' refers to a polymer compound made by polymerizing olefin-based monomers. Olefins are hydrocarbon compounds containing double bonds, such as ethylene and propylene.

[0037] The above polyolefin may be any one of polyethylene, polypropylene, polybutene, polyolefin elastomer, and polyolefin plastomomer, although not limited thereto.

[0038] In the present invention, the term 'polyethylene (PE)' refers to a thermoplastic plastic made by polymerizing ethylene monomers, which has high strength and chemical resistance and is mainly used in films, packaging materials, pipes, etc. PE is classified into high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), etc., depending on its density.

[0039] In this invention, the term 'polypropylene (PP)' refers to a polymer produced by polymerizing propylene monomers. It is widely used in packaging materials, automotive parts, and home appliances due to its lightweight nature, excellent strength, and superior heat resistance. PP is utilized as an important material in various industries due to its durability and cost-effectiveness.

[0040] In this invention, the term 'Polybutene (PB)' refers to a polymer polymerized from butene monomers, used in products resistant to high temperatures and pressures, such as fuel tanks, pipe systems, and wire insulation. It offers excellent flexibility and durability, as well as superior barrier performance against water and gas, making it suitable for various piping systems.

[0041] In the present invention, the term 'Polyolefin Elastomer (POE)' refers to a polymer with rubber-like properties made by combining olefin monomers such as ethylene and propylene, which has excellent impact resistance and flexibility and is used to increase shock absorption and flexibility in automotive parts, packaging materials, films, etc.

[0042] In the present invention, the term 'polyolefin plastomer (or polyolefin polymer)' refers to a polyolefin-based material that possesses the characteristics of polyolefins such as polyethylene (PE) or polypropylene (PP) while having intermediate characteristics between rubber and plastic. Polyolefin plastomers are generally based on polyethylene and play a role in improving impact resistance, flexibility, transparency, etc. due to their plastomer properties. When POP is used alone, almost no particles are generated, but there is a disadvantage that the hardness is very low, making it difficult to maintain the shape after molding.

[0043] In this invention, the term 'polystyrene (PS)' refers to a thermoplastic resin also known as polystyrene or polystyrol. It is transparent, lightweight, and rigid, and is easy to process, allowing it to be molded into various shapes.

[0044] In the present invention, the term 'ABS' refers to Acrylonitrile-Butadiene-Styrene copolymer, which has excellent mechanical strength and processability among thermoplastic resins. Additionally, ABS has excellent impact resistance, making it suitable as a material for industrial parts where appearance quality is important; it also has excellent secondary processability and good compatibility with other resins.

[0045] In the present invention, the term 'resin' refers to a polymer compound that can be molded by applying heat or pressure, and can be obtained from natural or synthetic materials. Resins are classified into two types: thermoplastic and thermosetting. Thermoplastic resins are resins that soften when heated, allowing for repeated molding, and harden again when cooled; examples include polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC). Thermosetting resins are resins that do not melt again once cured and maintain a solid state when heated; examples include epoxy resins and phenolic resins.

[0046] In the present invention, the term 'resin film' refers to a film-shaped material made by processing a synthetic polymer material into a thin film, and is mainly made of thermoplastic plastic resin and has thin and flexible characteristics.

[0047] In the present invention, the term 'cured film' refers to a hard and fixed protective layer formed by a resin or coating agent undergoing a curing reaction, and is formed on the surface after the liquid resin or coating agent reacts with heat, ultraviolet rays, a catalyst, etc., and hardens.

[0048] In this invention, the term "molding" refers to a process of processing a material into a specific shape to form a desired shape or structure, and generally involves applying heat, pressure, or mechanical force to materials such as plastic, metal, ceramic, or glass to form the shape of a product.

[0049] The types of molding processes mentioned above may include, but are not limited to, injection molding, extrusion molding, compression molding, vacuum molding, blow molding, etc.

[0050] In this invention, the term "vacuum forming" refers to a process in which a material is heated to become flexible, placed into a specific mold, and then shaped by closing the mold and adsorbing air toward the mold under vacuum conditions.

[0051] In the present invention, the term 'molded article' refers to a product or part formed into a specific shape through a molding process, and can be manufactured in various ways such as casting, compression molding, injection molding, and extrusion molding using various materials such as plastic, metal, and ceramic.

[0052] In the present invention, the term 'heating' refers to the process of applying heat to make a material flexible or moldable, and mainly includes inducing a material, such as a thermoplastic plastic, to reach a specific temperature so that it becomes easy to deform.

[0053] In this invention, the term 'cooling' refers to the process of lowering the temperature of a resin composition treated at a high temperature to solidify it while maintaining a desired shape, and is an important process for stabilizing the physical properties of the resin and increasing mechanical strength and dimensional stability.

[0054] The above cooling methods include, but are not limited to, air cooling, water cooling, and methods using cooling rollers.

[0055] In the present invention, the term 'separation' refers to the process of detaching a molded material or product from a mold or molding device, and includes the step of releasing contact with the mold after the shape of the product has stabilized to obtain a final product.

[0056] In the present invention, the term "compressing" refers to the process of applying physical pressure to a resin composition to flatten it to a specific thickness and density. After compression, the resin composition has a uniform thickness, and its strength can be increased by removing unnecessary air or bubbles.

[0057] In the present invention, the term 'other additives' refers to substances that can be ordinarily added to a resin composition and may include stabilizers, fillers, plasticizers, flame retardants, colorants, pigments, dispersants, lubricants, impact modifiers, antistatic agents, and crosslinking agents.

[0058] The above stabilizers may include antioxidants, UV stabilizers, etc., the above fillers may include glass fibers, calcium carbonate, mica, etc., the above flame retardants may include halogenated flame retardants and non-halogenated flame retardants, the above pigments may include organic pigments and inorganic pigments, the above lubricants may include waxes and metal soap-based lubricants, the above impact modifiers may include ethylene propylene diene rubber (EPDM), ethylene vinyl acetate (EVA), etc., and the above crosslinking agents may include isocyanates and organic peroxides.

[0059]

[0060] In one embodiment of the invention, a resin composition comprising polypropylene resin and polyolefin is provided.

[0061] In the above specific examples, the resin composition further comprises an inorganic filler and a siloxane-based compound, and provides a resin composition comprising 30 to 60 weight% of the polypropylene resin, 5 to 20 weight% of the inorganic filler, 0.1 to 10 weight% of the siloxane-based compound, and 1 to 50 weight% of the polyolefin, wherein the polypropylene resin is a homopolypropylene resin, wherein the polyolefin is any one selected from the group consisting of polyethylene, polypropylene, polybutene, polyolefin elastomer, and polyolefin plastomer, wherein the polyolefin is a polyolefin plastomer, wherein the polyolefin comprises 10 to 45 weight%, and wherein the polyolefin comprises 25 to 45 weight%.

[0062] In the above embodiment, the resin composition is provided in which the inorganic filler is one or more selected from the group consisting of talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay, and carbon black, and the resin composition is provided in which the siloxane compound is one or more selected from the group consisting of polydimethylsiloxane, hexamethyldisiloxane, cyclomethicone, methylphenylsiloxane, polytrimethylsiloxane, and silicone.

[0063] In one embodiment of the invention, a resin film is provided by forming a resin composition comprising a polypropylene resin, an inorganic filler, a siloxane-based compound, and a polyolefin into a film.

[0064] In one embodiment of the invention, a battery container molded article comprising a resin film formed by filming a resin composition is provided, and a molded article manufactured by including a resin composition is provided.

[0065] In one embodiment of the invention, a method for preparing a resin composition is provided, comprising the step of mixing 30 to 60 weight% of polypropylene resin, 10 to 45 weight% of polyolefin, 5 to 20 weight% of inorganic filler, and 0.1 to 10 weight% of a siloxane-based compound.

[0066] In the above embodiment, a method for preparing a resin composition is provided, wherein the polyolefin is mixed in an amount of 25 to 45 weight%.

[0067] In one embodiment of the invention, a method for manufacturing a resin film is provided, comprising the steps of pressing a resin composition and cooling.

[0068] In one embodiment of the invention, a method for manufacturing a resin molded article is provided, comprising the steps of heating, molding, cooling, and separating.

[0069]

[0070] The resin composition according to the present invention, comprising polypropylene (PP), talc (TALC), silicone (SY), and polyolefin-based plastomer (POP), has excellent scratch resistance and can be applied in various fields, such as secondary battery containers for electric vehicles.

[0071] Furthermore, the effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0072]

[0073] Figure 1 is a diagram illustrating the manufacturing process.

[0074] Figure 2 is a figure showing the results of a comparative experiment on the amount of particles generated according to Manufacturing Examples 1 to 4.

[0075] Figure 3 is a figure regarding the particle generation amount of the control group.

[0076]

[0077] The present invention will be described in more detail below through examples. These examples are intended solely to explain the present invention more specifically, and it will be obvious to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the invention.

[0078]

[0079] Example 1. Preparation of a scratch-resistant polyolefin resin composition.

[0080] Each raw material according to Preparation Examples 1 to 4 was mixed according to the composition ratios described in Table 1 below, extruded using an extruder, and then cooled and solidified to obtain a pellet-shaped composition. At this time, the molecular weight of polypropylene was about 200,000 to 600,000 g / mol and was purchased from Ensinger; the molecular weight of talc (Mg3H2(SiO3)4) was 350 to 400 g / mol and was purchased from Daemyung Chemical; the silicone was purchased from Hyupshin Mulsan; and the molecular weight of the polyolefin-based plastomer was 5,400 to 875,000 g / mol and was purchased from Affinity™.

[0081] Polypropylene, Talc, Silicon, Polyolefin-based Plastomer, Other Additives, Total Weight (g) Preparation Example 147 103 103 0 100 Preparation Example 247 103 20 20 100 Preparation Example 347 103 30 10 100 Preparation Example 447 103 40 0 ​​100

[0082] (Unit: weight). In particular, when the polyolefin-based plastomer was 50 weight%, no resin composition was produced.

[0083]

[0084] Example 2. Scratch Resistance Comparative Experiment

[0085] The amount of particles generated was measured after 20 reciprocating cycles over a 100mm section with a 90-degree angle between the cutter blade and the sample under a load of 2.0±0.2kg, and the experiment was conducted with a time of 10±1 second by marking the 100mm section on the sample and measuring the time for 20 reciprocating cycles (Fig. 2).

[0086] At this time, the degree of bending of the cutter blade that occurs when a load is applied to the cutter blade was checked, and the experiment was conducted while maintaining that angle. Since the cutter blade breaks when a load of 2.7 kg or more is applied to the cutter blade, excessive weight could not be supplied.

[0087] Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Average Value 42.608 23.164 19.89 11.346

[0088] Table 2 above shows the average value of the amount of particles generated after 20 reciprocating cycles over a 100mm section with a 90-degree angle between the cutter blade and the sample under a load of 2.0 ± 0.2 kg, measured 5 times. From this, it was confirmed that among Preparation Examples 1 to 4, Preparation Example 4, which had the highest weight% of polyolefin-based plastomer, showed the lowest particle generation (Fig. 2). For the control group, PP 100 wt%, PET 100 wt%, PS 100 wt%, ABS 100 wt%, and HDPE 100 wt% were prepared, and the amount of particles generated after 20 reciprocating cycles over a 100mm section with a 90-degree angle between the cutter blade and the sample under a load of 2.0 ± 0.2 kg was measured (Table 3).

[0089] PP particles were generated in the form of wood shavings. PET sawdust-like particles were generated, and a problem occurred where they easily detached from the product and adhered to the fixed parts of the test equipment. A large amount of particles were generated even with a force weaker than the PS test standard. ABS particles were generated even with a force weaker than the ABS test standard. HDPE particles were generated in the form of wood shavings.

[0090] From Table 3, it was confirmed that the control group has low scratch resistance and, unlike Manufacturing Examples 1 to 4, has the problem of generating a large amount of particles.

[0091] Foregoing, specific parts of the present invention have been described in detail. It is evident to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the invention. Accordingly, the actual scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A resin composition comprising polypropylene resin and polyolefin.

2. In Paragraph 1, A resin composition further comprising an inorganic filler and a siloxane-based compound.

3. In Paragraph 2, A resin composition comprising 30 to 60 weight% of the polypropylene resin, 5 to 20 weight% of the inorganic filler, 0.1 to 10 weight% of the siloxane-based compound, and 1 to 50 weight% of the polyolefin.

4. In Paragraph 1, A resin composition in which the above polypropylene resin is a homopolypropylene resin.

5. In Paragraph 1, A resin composition in which the above polyolefin is any one selected from the group consisting of polyethylene, polypropylene, polybutene, polyolefin elastomer and polyolefin plastomomer.

6. In Paragraph 1, A resin composition in which the above polyolefin is a polyolefin plastom.

7. In Paragraph 3, A resin composition comprising 10 to 45 weight% of the above polyolefin.

8. In Paragraph 3, A resin composition comprising 25 to 45 weight% of the above polyolefin.

9. In Paragraph 2, A resin composition in which the above-mentioned inorganic filler is one or more selected from the group consisting of talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay, and carbon black.

10. In Paragraph 2, A resin composition wherein the above siloxane-based compound is one or more selected from the group consisting of polydimethylsiloxane, hexamethyldisiloxane, cyclomethicone, methylphenylsiloxane, polytrimethylsiloxane, and silicone.

11. A resin film comprising a resin composition described in any one of claims 1 to 8.

12. In Paragraph 11, A battery container molded article comprising the above resin film.

13. A molded article manufactured by including a resin composition described in any one of claims 1 to 8.

14. A method for preparing a resin composition comprising the step of mixing 30 to 60 weight% of polypropylene resin, 10 to 45 weight% of polyolefin, 5 to 20 weight% of inorganic filler, and 0.1 to 10 weight% of a siloxane-based compound.

15. In Paragraph 14, A method for manufacturing a resin composition, wherein the above polyolefin is mixed in an amount of 25 to 45 weight%.

16. A method for manufacturing a resin film, comprising the steps of pressing the resin composition described in claim 1 and cooling.

17. A method for manufacturing a resin molded article, comprising the steps of heating, molding, cooling, and separating the resin composition described in claim 1.

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