Polyester compositions and their products

Abstract

To provide a polyester composition and a product thereof that are excellent in mechanical properties, heat resistance, and processability.SOLUTION: A polyester composition includes a resin (A), a fiber reinforcement (B), an organic reinforcement (C), a crystal nucleating agent (D), and a toughening agent (E). An intrinsic viscosity of the resin (A) is 0.6 dL / g to 0.85 dL / g.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a polyester composition, and particularly to a polyester composition that can be processed under low-temperature conditions and products thereof.

Background Art

[0002] Many of the tableware commonly seen at present are made of melamine. However, when melamine tableware is damaged or scratched, it may release toxins when exposed to heat, which may enter the human body and damage organs. In addition, the commonly seen polyester tableware at present is obtained from polyethylene terephthalate (PET) added with a nucleating agent. Polyethylene terephthalate containing a nucleating agent needs to be injection-molded using a high mold temperature (for example, 130 ° C) or injection-molded using a low mold temperature and then post-crystallized, and the heat resistance temperature of the produced tableware is only 150 ° C. Therefore, how to improve the production efficiency and heat resistance of non-toxic products is an urgent issue for those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The present invention provides a polyester composition and products thereof that are excellent in mechanical properties, heat resistance, and processability.

Means for Solving the Problems

[0004] The polyester composition of the present invention includes a resin (A), a fiber reinforcing material (B), an inorganic reinforcing material (C), a nucleating agent (D), and a strengthening agent (E). The intrinsic viscosity (IV) of the resin (A) is 0.6 dL / g to 0.85 dL / g.

[0005] In one embodiment of the present invention, the above-mentioned resin (A) includes virgin polyethylene terephthalate (PET) resin, recycled polyethylene terephthalate (RPET), or a combination thereof.

[0006] In one embodiment of the present invention, the fiber reinforcement (B) described above includes glass fibers, carbon fibers, titanium fibers, boron fibers, or a combination thereof.

[0007] In one embodiment of the present invention, the total amount of the polyester composition described above is 100 parts by weight, and the amount of fiber reinforcement (B) is 5 to 20 parts by weight.

[0008] In one embodiment of the present invention, the inorganic reinforcing material (C) described above includes talc powder, titanium dioxide, silicon dioxide, calcium carbonate, or a combination thereof.

[0009] In one embodiment of the present invention, the total amount of the polyester composition described above is 100 parts by weight, and the amount of the inorganic reinforcing material (C) is 5 to 20 parts by weight.

[0010] In one embodiment of the present invention, the nucleating agent (D) described above comprises at least one organic nucleating agent.

[0011] In one embodiment of the present invention, the reinforcing agent (E) described above includes ethylene-methyl acrylate-glycidyl methacrylate ternary copolymer (EMA-g-GMA), glycidyl methacrylate grafted polyolefin elastomer (POE-g-GMA), styrene-ethylene / butylene-styrene copolymer (SEBS), maleic anhydride grafted styrene-ethylene / butylene-styrene block copolymer (SEBS-g-MAH), methyl methacrylate-butadiene-styrene (MBS), or a combination thereof.

[0012] In one embodiment of the present invention, the polyester composition described above further comprises a lubricant (F). The lubricant (F) includes stearates, polyethylene waxes, siloxane modifiers, fluororesins, or combinations thereof.

[0013] In one embodiment of the present invention, the polyester composition described above further comprises an antioxidant (G). The antioxidant (G) includes a hindered phenol antioxidant, a phenol antioxidant, a phosphite ester antioxidant, a complex antioxidant, or a combination thereof.

[0014] In one embodiment of the present invention, the polyester composition described above further comprises a lubricant (F), an antioxidant (G), or a combination thereof. With a total amount of the polyester composition of 100 parts by weight, the amount of lubricant (F) is 0.1 to 2 parts by weight, and the amount of antioxidant (G) is 0.2 to 2 parts by weight.

[0015] In one embodiment of the present invention, with a total amount of the polyester composition described above being 100 parts by weight, the amount of resin (A) is 60 to 80 parts by weight, the amount of nucleating agent (D) is 2.5 to 10 parts by weight, and the amount of reinforcing agent (E) is 0.3 to 2 parts by weight.

[0016] The product of the present invention is manufactured using the above-described polyester composition as engineering plastic granules. [Effects of the Invention]

[0017] Based on the above, the polyester composition of the present invention comprises a resin (A), a fiber reinforcing material (B), an inorganic reinforcing material (C), a nucleating agent (D), and a strengthening agent (E), and the intrinsic viscosity of the resin (A) is 0.6 dL / g to 0.85 dL / g. This allows the polyester composition to be endowed with excellent mechanical properties, heat resistance, and processability. Furthermore, the polyester composition of the present invention can be processed as engineering plastic granules and can be processed at low mold temperatures, simplifying the manufacturing process and making it easy to implement, thus having value in large-scale industrial production.

[0018] For a clearer understanding of the above-mentioned features and advantages of the present invention, embodiments will be described in detail below. [Modes for carrying out the invention]

[0019] Embodiments of the present invention are described in detail below. The details of the embodiments provided are illustrative and do not limit the scope of protection of the present invention. Those skilled in the art can modify or change these details of the embodiments based on the requirements of their actual implementation. Furthermore, in order to avoid ambiguity in describing the various principles of the present invention, descriptions of well-known apparatus, methods, and materials may be omitted.

[0020] In this specification, a range expressed as "approximately" one specific value to "approximately" another specific value may also be expressed directly as one specific value and / or another specific value. When this range is expressed, the other embodiment encompasses the range from that one specific value and / or the other specific value. Similarly, when the preceding "approximately" is used to indicate that a value is an approximation, it should be understood that the specific value forms another embodiment. Furthermore, it should be understood that the endpoints of each range are either clearly related to or unrelated to the other endpoint.

[0021] In this specification, non-limiting terms (e.g., possible, may be, e.g., or other similar terms) are optional but not required practices, including addition or presence.

[0022] Unless otherwise defined, terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art. Furthermore, terms (as defined in commonly used dictionaries) should be understood to have the same meaning as those in the relevant art, and should not be interpreted in this way unless explicitly defined as idealized or overly formal.

[0023] <Polyester composition> The present invention provides a polyester composition comprising a resin (A), a fiber reinforcing material (B), an inorganic reinforcing material (C), a nucleating agent (D), and a strengthening agent (E). The polyester composition of the present invention may further contain, as necessary, a lubricant (F), an antioxidant (G), or other suitable additives. Each of the above-mentioned components is described in detail below.

[0024] Resin (A) The intrinsic viscosity of Resin (A) is 0.6 dL / g to 0.85 dL / g, preferably 0.6 dL / g to 0.76 dL / g. When the intrinsic viscosity of Resin (A) is less than 0.6 dL / g, the impact resistance of the polyester composition may be reduced, resulting in problems such as insufficient strength and / or cracking of the polyester composition or its products. When the intrinsic viscosity of Resin (A) is higher than 0.85 dL / g, it may increase the melt flow index (MI) of the polyester composition, which deteriorates the fluidity of the polyester composition and makes it difficult to apply in subsequent processing steps.

[0025] There are no particular restrictions on the structure / composition of Resin (A), and appropriate resins may be selected as needed. For example, Resin (A) may include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or other appropriate resins. Polyethylene terephthalate may include virgin polyethylene terephthalate resin, recycled polyethylene terephthalate, or a combination thereof. Sources of recycled polyethylene terephthalate may include packaging material recycled pellets, film material recycled pellets, fabric recycled pellets, industrial recycled environmental protection recycled polyester pellets, or other appropriate polyethylene terephthalate products to meet the needs of recycling material introduction, but are not limited thereto. Packaging material recycled pellets may include recycled pellets for bottles (e.g., PET bottle recycled pellets), tray recycled pellets, or other appropriate packaging material products.

[0026] Taking the total dosage of the polyester composition as 100 parts by weight, the dosage of Resin (A) is 60 parts by weight to 80 parts by weight, preferably 65 parts by weight to 72 parts by weight.

[0027] Fiber Reinforcement (B) There are no particular restrictions on the fiber reinforcement (B), and an appropriate fiber reinforcement may be selected as needed. In this embodiment, the fiber reinforcement (B) may include glass fibers, carbon fibers, titanium fibers, boron fibers, combinations thereof, or other suitable fiber reinforcements, with glass fibers or carbon fibers being preferred. When the polyester composition contains the fiber reinforcement (B), the polyester composition can be endowed with desirable impact resistance, flexural strength, rigidity, and heat resistance, i.e., desirable mechanical properties and heat resistance.

[0028] With a total amount of polyester composition of 100 parts by weight, the amount of fiber reinforcement (B) is 5 to 20 parts by weight, preferably 8 to 15 parts by weight. When the amount of fiber reinforcement (B) is within the above range, the polyester composition can be given excellent mechanical properties, heat resistance, and processability. If the amount of fiber reinforcement (B) is less than 5 parts by weight, the heat resistance of the polyester composition may be reduced. If the amount of fiber reinforcement (B) is greater than 20 parts by weight, the melt flow index of the polyester composition may increase, which reduces the fluidity of the polyester composition and makes it difficult to apply in subsequent processing steps.

[0029] Inorganic reinforcing material (C) There are no particular restrictions on the inorganic reinforcing material (C), and an appropriate inorganic reinforcing material may be selected as needed. In this embodiment, the inorganic reinforcing material (C) includes talc powder, titanium dioxide, silicon dioxide, calcium carbonate, a combination thereof, or other suitable inorganic reinforcing materials, with talc powder or calcium carbonate being preferred. When the polyester composition contains the inorganic reinforcing material (C), the polyester composition can be given desirable flexural strength, rigidity, heat resistance, and moldability.

[0030] With a total amount of polyester composition of 100 parts by weight, the amount of inorganic reinforcing material (C) is 5 to 20 parts by weight, preferably 8 to 18 parts by weight. When the amount of inorganic reinforcing material (C) is within the above range, the polyester composition can be given desirable mechanical properties, heat resistance, and processability. If the amount of inorganic reinforcing material (C) is less than 5 parts by weight, it may impair the heat resistance of the polyester composition and make demolding difficult during molding. If the amount of inorganic reinforcing material (C) is more than 20 parts by weight, it may reduce the impact resistance of the polyester composition, potentially causing the polyester composition or its product to fail a drop test.

[0031] Nuclear agent (D) There are no particular restrictions on the nucleating agent (D), and an appropriate nucleating agent (D) may be selected as needed. In this embodiment, the nucleating agent (D) may include at least one organic nucleating agent. The organic nucleating agent may include an organosodium salt or another suitable organic nucleating agent. The organosodium salt may include sodium benzoate, sodium montanate, Surlyn resin (e.g., EMAA (trade name) from DuPont), or another suitable organosodium salt, with sodium benzoate, Surlyn resin, or a combination thereof being preferred, and a combination of sodium benzoate and Surlyn resin being more preferred. The weight mixing ratio of sodium benzoate to Surlyn resin may be 1:10 to 1:20, and 1:12 to 1:16 is preferred. When the polyester composition contains the nucleating agent (D), the heat resistance of the polyester composition can be improved.

[0032] With a total amount of polyester composition of 100 parts by weight, the amount of nucleating agent (D) is 2.5 to 10 parts by weight, preferably 3 to 5 parts by weight.

[0033] Reinforcement agent (E) There are no particular restrictions on the reinforcing agent (E), and an appropriate reinforcing agent may be selected as needed. In this embodiment, the reinforcing agent (E) may include ethylene-methyl acrylate-glycidyl methacrylate terpolymer, glycidyl methacrylate grafted polyolefin elastomer, styrene-ethylene / butylene-styrene copolymer, maleic anhydride grafted styrene-ethylene / butylene-styrene block copolymer, methyl methacrylate-butadiene-styrene, a combination thereof, or other appropriate reinforcing agents, with ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA-g-GMA) being preferred. When the polyester composition contains the reinforcing agent (E), the interfacial compatibility and impact resistance between the components in the polyester composition can be improved.

[0034] With a total amount of polyester composition of 100 parts by weight, the amount of reinforcing agent (E) is 0.3 parts by weight to 2 parts by weight, and preferably 0.5 parts by weight to 1 part by weight.

[0035] Lubricant (F) There are no particular restrictions on the lubricant (F), and an appropriate lubricant may be selected as needed. In this embodiment, the lubricant (F) may include stearates, polyethylene wax, siloxane modifiers, fluororesins, combinations thereof, or other suitable lubricants, with polyethylene wax being preferred. When the polyester composition contains the lubricant (F), the fluidity of the polyester composition can be improved. This contributes to improved fluidity and release properties in subsequent processing steps (e.g., injection molding).

[0036] With a total amount of polyester composition of 100 parts by weight, the amount of lubricant (F) is 0.1 to 2 parts by weight, preferably 0.3 to 1 part by weight.

[0037] Antioxidant (G) There are no particular restrictions on antioxidant (G), and an appropriate antioxidant may be selected as needed. In this embodiment, antioxidant (G) may include a hindered phenol antioxidant, a phenol antioxidant, a phosphite ester antioxidant, a composite antioxidant, a combination thereof, or other suitable antioxidants, with composite antioxidants being preferred. For example, a composite antioxidant may include a combination of a hindered phenol antioxidant and a phosphite ester antioxidant, or a combination of other suitable antioxidants. The weight mixing ratio of the hindered phenol antioxidant and the phosphite ester antioxidant may be 2:1 to 1:2, and 1:1 to 1:1.5 is preferred. When the polyester composition contains antioxidant (G), the heat resistance and processability of the polyester composition can be improved.

[0038] With a total amount of polyester composition of 100 parts by weight, the amount of antioxidant (G) is 0.2 parts by weight to 2 parts by weight, and preferably 0.3 parts by weight to 1 part by weight.

[0039] <Method for producing polyester composition> There are no particular restrictions on the method for producing the polyester composition. For example, a resin (A), a fiber reinforcing material (B), an inorganic reinforcing material (C), a nucleating agent (D), and a strengthening agent (E) may be placed in a stirrer and stirred until uniformly mixed to form a solution. If necessary, a lubricant (F) and an antioxidant (G) may be added, and after uniform mixing, a liquid polyester composition can be obtained.

[0040] <Product> One exemplary embodiment of the present invention provides a product using the above-described polyester composition as engineering plastic granules.

[0041] For example, a polyester composition may be processed into engineering plastic granules to produce a product. There are no particular restrictions on the processing steps, and an appropriate processing step may be selected as needed. The processing steps may include extrusion molding, injection molding, sheet processing, or other suitable processing methods.

[0042] The temperature of the molding die in the processing step may be 80°C or lower, and preferably between 60°C and 80°C. This eliminates the need to cool the product molded in the die before subsequent processes, allowing subsequent steps to be performed directly. This increases the production efficiency of the product and reduces energy consumption.

[0043] The present invention will be described in detail below with reference to examples. The following examples are provided for the purpose of illustrating the present invention, and the scope of the present invention includes, but is not limited to, the claims and their substitutions and modifications described below.

[0044] Examples To demonstrate that the polyester composition provided by the present invention has excellent mechanical properties, heat resistance, and processability, experimental examples are specifically given below.

[0045] The types and amounts of components in the polyester compositions of Example 1 and Comparative Examples 1 to 6 are listed in Tables 1 and 2 below. The manufactured polyester compositions were analyzed using the following test methods, and the results are shown in Tables 1 and 2.

[0046] [Table 1] JPEG0007856701000002.jpg47163

[0047] *The glass fiber selected for the fiber reinforcement material (B) is HP 3786 (product name, manufactured by PFG FIBER GLASS CORPORATION), which is a short fiber with a diameter of 10 micrometers and a length of 4.5 micrometers. *The Surlyn resin selected as the nucleating agent (D) is Surlyn 8920 (trade name, manufactured by DuPont). *The composite antioxidant selected for antioxidant (G) is B225 (trade name, manufactured by Double Bond Chemical Ind., Co., Ltd.), which is a mixture of a hindered phenol antioxidant and a phosphite ester antioxidant in a 1:1 weight ratio.

[0048] [Table 2] JPEG0007856701000004.jpg82163

[0049] <Testing Method> Impact strength: Tested according to ASTM D256 standard. The obtained value (kg-cm / cm) represents the total energy that the polyester composition withstood at the time of fracture. A higher value indicates a higher impact strength (or resistance strength) that the polyester composition can withstand.

[0050] Tensile strength: Tested according to ASTM D638 standard. The obtained value represents the total energy that the polyester composition can withstand under tensile deformation. A higher value indicates a higher tensile strength that the polyester composition can withstand.

[0051] Bending strength: Tested according to ASTM D790 standard. The obtained value represents the resistance of the polyester composition to bending deformation. A higher value indicates a higher bending strength that the polyester composition can withstand.

[0052] Flexural modulus: Tested according to ASTM D790 standard. The obtained value represents the total amount of energy that the polyester composition can withstand during bending deformation. A higher value indicates higher stiffness of the polyester composition.

[0053] Heat deflection temperature (HDT): Tested under a pressure of 0.45 MPa according to the ASTM D648 standard. The obtained value represents the heat deformation resistance of the polyester composition. A higher value indicates higher heat resistance of the polyester composition.

[0054] Melt Flow Index: Based on the ASTM D1238 standard, the amount of liquid flowed after 10 minutes at a temperature of 275°C with a weight set to 2.16 kg was measured. The resulting value represents the fluidity of the polyester composition. A higher value indicates a higher viscosity of the polyester composition.

[0055] Moldability: The polyester composition was injection molded into products at a mold temperature of 80°C. The results were observed to determine whether the products were successfully manufactured, unmoldable, or unable to be demolded and injected (i.e., adhered to the mold). Successful molding of the products indicates excellent moldability of the polyester composition.

[0056] Drop test: A polyester composition product was dropped from a height of 1.8 meters, and it was observed whether or not the product broke. The fact that the product did not break indicates that the polyester composition product has excellent toughness.

[0057] <Test Results> Table 1 shows that when the polyester composition contains resin (A), fiber reinforcement (B), inorganic reinforcement (C), nucleating agent (D), and strengthening agent (E), and the intrinsic viscosity of resin (A) is between 0.6 dL / g and 0.85 dL / g (Example 1), the polyester composition can be seen to produce a product that possesses excellent impact resistance, flexural strength, rigidity, heat resistance (e.g., reaching 170°C), fluidity, moldability, and toughness, i.e., excellent mechanical properties and moldability simultaneously, and does not crack. In contrast, when the intrinsic viscosity of resin (A) in the polyester composition is not within the range of 0.6 dL / g and 0.85 dL / g (Comparative Examples 1 and 2), the impact resistance, flexural strength, rigidity, heat resistance, fluidity, moldability, and / or toughness are inferior. When the intrinsic viscosity of resin (A) in the polyester composition is less than 0.6 dL / g (Comparative Example 1), the product made from the polyester composition may crack after a drop test. When the intrinsic viscosity of resin (A) in the polyester composition is higher than 0.85 dL / g (Comparative Example 2), the polyester composition becomes unmold when injected under high pressure (high power) during the manufacturing process of the product.

[0058] Furthermore, Table 2 shows that, compared to a polyester composition that does not contain fiber reinforcement (B), or a polyester composition in which the amount of fiber reinforcement (B) is less than 5 parts by weight when the total amount of polyester composition is 100 parts by weight (Comparative Example 3), the polyester composition containing fiber reinforcement (B) in an amount of 5 to 20 parts by weight (Example 1) is superior in impact resistance, flexural strength, rigidity, and heat resistance, and at the same time possesses excellent moldability and toughness.

[0059] Furthermore, comparing a polyester composition with a total amount of 100 parts by weight of polyester composition and a fiber reinforcement (B) amount greater than 20 parts by weight (Comparative Example 4), the polyester composition with a fiber reinforcement (B) amount of 5 to 20 parts by weight (Example 1) exhibits excellent moldability and simultaneously possesses excellent impact resistance, bending strength, rigidity, and heat resistance.

[0060] Furthermore, compared to a polyester composition that does not contain inorganic reinforcing material (C), or a polyester composition in which the amount of inorganic reinforcing material (C) is less than 5 parts by weight, with a total amount of polyester composition of 100 parts by weight (Comparative Example 5), the polyester composition containing inorganic reinforcing material (C) in an amount of 5 to 20 parts by weight (Example 1) exhibits superior bending strength, rigidity, heat resistance, and moldability, while simultaneously possessing excellent impact resistance and toughness.

[0061] Furthermore, compared to a polyester composition (Comparative Example 6) in which the amount of inorganic reinforcing material (C) is greater than 20 parts by weight, with a total amount of polyester composition of 100 parts by weight, the polyester composition (Example 1) in which the amount of inorganic reinforcing material (C) is 5 to 20 parts by weight exhibits superior impact resistance, flexural strength, and toughness, while simultaneously possessing excellent rigidity and heat resistance.

[0062] In summary, the polyester composition of the present invention comprises a resin (A), a fiber reinforcement (B), an inorganic reinforcement (C), a nucleating agent (D), and a strengthening agent (E), and when the intrinsic viscosity of the resin (A) is 0.6 dL / g to 0.85 dL / g, the polyester composition is endowed with excellent mechanical properties and moldability, and can be used in subsequent processing to produce products. In particular, products can be molded (injection molded) under low mold temperature conditions (e.g., 80°C or below). Furthermore, products manufactured with the polyester composition of the present invention can have properties such as excellent toughness, no cracking after drop tests, and the introduction of environmentally friendly recycled materials to reduce carbon emissions. As a result, it can be applied to products such as tableware where excellent heat resistance is essential, and at the same time, the products have microwave-safe functionality and are non-toxic, making them highly versatile.

[0063] Although the present invention has been disclosed above in the embodiments, these are not intended to limit the invention, and those skilled in the art can make some changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is as defined in the appended patent application. [Industrial applicability]

[0064] The polyester composition of the present invention can be applied to products such as tableware where excellent heat resistance is essential, and the products can have microwave-safe functionality and be non-toxic.

Claims

1. A polyester composition, The resin (A) has an intrinsic viscosity of 0.6 dL / g to 0.85 dL / g and includes a virgin polyethylene terephthalate resin, recycled polyethylene terephthalate, or a combination thereof. A fiber reinforcement material (B) comprising glass fibers, carbon fibers, titanium fibers, boron fibers, or a combination thereof, which are short fibers with a diameter of 10 micrometers and a length of 4.5 micrometers, An inorganic reinforcing material (C) containing talc powder, calcium carbonate, or a combination thereof, Nuclear agent (D), Reinforcement agent (E) and Includes, With a total amount of 100 parts by weight of the polyester composition, the amount of resin (A) is 60 to 80 parts by weight, the amount of fiber reinforcing material (B) is 5 to 20 parts by weight, the amount of inorganic reinforcing material (C) is 5 to 20 parts by weight, the amount of nucleating agent (D) is 2.5 to 10 parts by weight, and the amount of reinforcing agent (E) is 0.3 to 2 parts by weight. Polyester composition.

2. The nucleating agent (D) comprises at least one organic nucleating agent. The polyester composition according to claim 1.

3. The reinforcing agent (E) includes ethylene-methyl acrylate-glycidyl methacrylate ternary copolymer, glycidyl methacrylate grafted polyolefin elastomer, styrene-ethylene / butylene-styrene copolymer, maleic anhydride grafted styrene-ethylene / butylene-styrene block copolymer, methyl methacrylate-butadiene-styrene, or a combination thereof. The polyester composition according to claim 1.

4. Lubricant (F) It further includes, The lubricant (F) includes stearates, polyethylene wax, siloxane modifiers, fluororesins, or combinations thereof. The polyester composition according to claim 1.

5. Antioxidant (G) It further includes, The antioxidant (G) includes a hindered phenol antioxidant, a phenol antioxidant, a phosphite ester antioxidant, or a combination thereof. The polyester composition according to claim 1.

6. Lubricant (F), antioxidant (G), or combination thereof It further includes, With a total amount of the polyester composition being 100 parts by weight, the amount of the lubricant (F) is 0.1 to 2 parts by weight, and the amount of the antioxidant (G) is 0.2 to 2 parts by weight. The polyester composition according to claim 1.

7. A polyester composition according to any one of claims 1 to 6 is used as engineering plastic granules to produce a product. product.

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