Polyester composition and article thereof

Abstract

The invention provides a polyester composition and a product thereof. The polyester composition comprises polyethylene terephthalate (A), inorganic powder (B), a nucleating agent (C), a lubricant (D) and an antioxidant (E).

Description

Technical Field

[0001] The present invention relates to a polyester composition, and in particular to a polyester composition that can be processed under low temperature conditions and a product thereof. Background Art

[0002] Polyethylene terephthalate (PET) has excellent tensile and flexural strength and is widely used in applications such as tableware, buckles, zippers, and fabrics. Currently, the most common high-temperature resistant PET material is improved by adding glass fiber. However, PET containing glass fiber has high hardness and brittleness, resulting in poor fluidity and difficulty in further applications, which in turn leads to poor workability. Summary of the Invention

[0003] The present invention provides a polyester composition having good physical properties and processability and a product thereof.

[0004] The polyester composition of the present invention comprises polyethylene terephthalate (A), inorganic powder (B), a crystal nucleating agent (C), a lubricant (D) and an antioxidant (E).

[0005] In one embodiment of the present invention, the polyester composition does not include glass fiber.

[0006] In one embodiment of the present invention, the intrinsic viscosity (IV) of the polyethylene terephthalate (A) is 0.7 dL / g to 1 dL / g.

[0007] In one embodiment of the present invention, the inorganic powder (B) includes talc, titanium dioxide, silicon dioxide, mica, calcium carbonate, calcium sulfate whiskers or a combination thereof.

[0008] In one embodiment of the present invention, the crystal nucleating agent (C) includes a sodium salt of an organic acid.

[0009] In one embodiment of the present invention, the lubricant (D) includes stearates, polyethylene wax, modified silicone, fluorine-based resin, or a combination thereof.

[0010] In one embodiment of the present invention, the antioxidant (E) includes a hindered phenol antioxidant, a phenol antioxidant, a phosphite antioxidant, a composite antioxidant, or a combination thereof.

[0011] In one embodiment of the present invention, the polyester composition further comprises other polymers (F), a compatibilizer (G) or a combination thereof. The other polymers (F) do not include polyethylene terephthalate (A).

[0012] In one embodiment of the present invention, the other polymer (F) includes polypropylene (PP), nylon 6 (PA6), nylon 66 (PA66), nylon 12 (PA12), or a combination thereof.

[0013] In one embodiment of the present invention, the compatibilizer (G) includes ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMA-g-GMA), polyethylene octene grafted glycidyl methacrylate (POE-g-GMA), styrene-ethylene / butylene-styrene copolymer (SEBS), styrene-ethylene / butylene-styrene block copolymer grafted maleic anhydride (SEBS-g-MAH), or a combination thereof.

[0014] In one embodiment of the present invention, based on 100 parts by weight of the total amount of the polyester composition, the amount of the other polymer (F) is 2.5 parts by weight to 35 parts by weight, and the amount of the compatibilizer (G) is 5 parts by weight to 20 parts by weight.

[0015] In one embodiment of the present invention, based on 100 parts by weight of the total amount of the polyester composition, the amount of polyethylene terephthalate (A) is 30 to 80 parts by weight, the amount of the inorganic powder (B) is 5 to 30 parts by weight, the amount of the crystal nucleating agent (C) is 0.5 to 15 parts by weight, the amount of the lubricant (D) is 0.05 to 1 part by weight, and the amount of the antioxidant (E) is 0.1 to 1 part by weight.

[0016] A product of the present invention is made by using the above polyester composition as engineering plastic particles.

[0017] Based on the above, the polyester composition of the present invention includes an inorganic powder (B). This allows the polyester composition to possess excellent physical properties and processability. Furthermore, the polyester composition of the present invention can be processed as engineering plastic pellets at low mold temperatures, making the process simple and easy to implement, and having industrial mass production potential.

[0018] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below for detailed description. DETAILED DESCRIPTION

[0019] The following are examples that describe the present invention in detail. The implementation details provided in these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate the ability to modify or alter these implementation details as needed for practical implementation. Furthermore, descriptions of well-known devices, methods, and materials may be omitted to avoid obscuring the principles of the present invention.

[0020] Ranges may be expressed herein as from "about" one particular value to "about" another particular value, which may also be expressed directly as one particular value and / or to another particular value. When expressing a range, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when a value is expressed as an approximation by using the antecedent "about," it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each range may be expressed in relation to or independent of the other endpoint.

[0021] As used herein, non-limiting terms (eg, may, could, for example, or other similar terms) refer to optional or optional implementation, inclusion, addition, or presence.

[0022] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the relevant technical context and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0023] <Polyester composition>

[0024] The present invention provides a polyester composition comprising polyethylene terephthalate (A), an inorganic powder (B), a crystal nucleating agent (C), a lubricant (D), and an antioxidant (E). Furthermore, the polyester composition of the present invention may optionally include another polymer (F), a compatibilizer (G), or other suitable additives. The above components are described in detail below.

[0025] In this embodiment, the polyester composition may not include glass fibers. Compared to currently known polyester compositions containing glass fibers, the polyester composition of this embodiment without glass fibers may have better fluidity, thus having good workability and being suitable for processing. Furthermore, compared to currently known polyester compositions containing glass fibers, the polyester composition of this embodiment without glass fibers may be used in processing techniques (such as extrusion molding, injection molding, or sheet metal processing) under low-temperature conditions (e.g., mold temperatures below 90°C), eliminating the need for post-crystallization during subsequent processing, thereby improving product production efficiency and reducing energy consumption.

[0026] Polyethylene terephthalate (A)

[0027] There are no specific limitations on the polyethylene terephthalate (A). An appropriate polyethylene terephthalate (A) can be selected based on specific needs. For example, the polyethylene terephthalate (A) can include virgin pellets, recycled pellets, or other suitable polyethylene terephthalate. Recycled pellets can be sourced from recycled bottles, recycled film pellets, recycled fabric pellets, recycled industrial polyester pellets (e.g., release film), or other polyethylene terephthalate products to meet the needs of recycled material incorporation, but are not limited to these sources.

[0028] In the present embodiment, the intrinsic viscosity of polyethylene terephthalate (A) is 0.7 dL / g to 1 dL / g, preferably 0.7 dL / g to 0.92 dL / g. The intrinsic viscosity of the environmentally friendly recycled particles can generally be 0.5 dL / g to 0.62 dL / g. Therefore, the environmentally friendly recycled particles can first undergo a viscosity-increasing step to increase their intrinsic viscosity, and then the environmentally friendly recycled particles with increased intrinsic viscosity can be used in the polyester composition. When the intrinsic viscosity of polyethylene terephthalate (A) is less than 0.7 dL / g, the polyethylene terephthalate (A) may have too low an impact strength, causing the product made thereof to have problems of insufficient strength and / or embrittlement. When the intrinsic viscosity of polyethylene terephthalate (A) is greater than 1 dL / g, the polyethylene terephthalate (A) may have too high a viscosity, causing the polyester composition to have poor fluidity and be difficult to apply to processing technology.

[0029] Based on 100 parts by weight of the total amount of the polyester composition, the amount of polyethylene terephthalate (A) is 30 parts by weight to 80 parts by weight, preferably 33 parts by weight to 70 parts by weight.

[0030] Inorganic powder (B)

[0031] There is no particular limitation on the inorganic powder (B), and appropriate inorganic powders can be selected according to the needs. For example, the inorganic powder (B) may include micro-nano inorganic powders or other suitable inorganic powders. The particle size of the inorganic powder (B) may be 0.3 μm to 10 μm, preferably 0.7 μm to 5 μm. In this embodiment, the inorganic powder (B) may include talc, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate whiskers or other suitable inorganic powders, preferably calcium carbonate, talc, silica or a combination thereof.

[0032] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the inorganic powder (B) is 5 to 30 parts by weight, preferably 10 to 25 parts by weight.

[0033] When the polyester composition includes the inorganic powder (B), the polyester composition can have better heat resistance, good mechanical properties, and a high degree of structural order. However, when the amount of the inorganic powder (B) is less than 5 parts by weight, the improvement in the crystallinity and heat resistance of the polyester composition may be insignificant. When the amount of the inorganic powder (B) is greater than 30 parts by weight, the improvement in the crystallinity and heat resistance of the polyester composition may reach its limit.

[0034] Nucleating agent (C)

[0035] The nucleating agent (C) is not particularly limited and may be selected as needed. In this embodiment, the nucleating agent (C) may include a sodium salt of an organic acid or other suitable nucleating agent. For example, the sodium salt of an organic acid may include sodium benzoate, sodium montanate, EMAA Surlyn resin (a trade name manufactured by DuPont), or other suitable sodium salts of an organic acid, preferably EMAA Surlyn resin, sodium benzoate, or a combination thereof.

[0036] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the crystal nucleating agent (C) is 0.5 parts by weight to 15 parts by weight, preferably 3 parts by weight to 10 parts by weight.

[0037] Lubricant (D)

[0038] The lubricant (D) is not particularly limited and may be selected as needed. In this embodiment, the lubricant (D) may include stearates, polyethylene wax, modified silicone, fluororesins, or other suitable lubricants, preferably polyethylene wax, stearates, or a combination thereof.

[0039] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the lubricant (D) is 0.05 to 1 part by weight, preferably 0.1 to 0.5 parts by weight.

[0040] Antioxidant (E)

[0041] There is no particular limitation on the antioxidant (E), and an appropriate antioxidant can be selected according to the needs. In this embodiment, the antioxidant (E) may include hindered phenol antioxidants, phenolic antioxidants, phosphite antioxidants, composite antioxidants or other suitable antioxidants, preferably phosphite antioxidants. For example, phosphite antioxidants may include phosphite, tris (2,4-di-tert-butylphenyl) phosphite, 201 (trade name, manufactured by Yongguang Chemical Industry Co., Ltd.) or other suitable phosphite antioxidants.

[0042] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the antioxidant (E) is 0.1 to 1 part by weight, preferably 0.1 to 0.5 parts by weight.

[0043] Other polymers (F)

[0044] The other polymer (F) does not include polyethylene terephthalate (A). Other than this, the other polymer (F) is not particularly limited and may be selected as needed. In this embodiment, the other polymer (F) includes polypropylene, nylon 6, nylon 66, nylon 12, or other suitable polymers, preferably polypropylene, nylon 6, or a combination thereof.

[0045] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the other polymer (F) is 2.5 parts by weight to 35 parts by weight, preferably 10 parts by weight to 25 parts by weight.

[0046] Compatibilizer (G)

[0047] There are no particular limitations on the compatibilizer (G), and an appropriate compatibilizer may be selected based on specific needs. In this embodiment, the compatibilizer (G) may include ethylene-methyl acrylate-glycidyl methacrylate terpolymer, polyethylene octene grafted onto glycidyl methacrylate, styrene-ethylene / butylene-styrene copolymer, styrene-ethylene / butylene-styrene block copolymer grafted onto maleic anhydride, or other suitable compatibilizers.

[0048] Based on 100 parts by weight of the total amount of the polyester composition, the amount of the compatibilizer (G) used is 5 to 20 parts by weight, preferably 7 to 13 parts by weight. When the amount of the compatibilizer (G) used is greater than 20 parts by weight, the heat deformation temperature of the polyester composition may be reduced.

[0049] When the polyester composition includes another polymer (F), a compatibilizer (G) may be added to improve the interfacial compatibility between the various components. When the polyester composition further includes another polymer (F), a compatibilizer (G), or other suitable additives, a combination of the other polymer (F) and the compatibilizer (G) is preferred. When the polyester composition includes another polymer (F) and a compatibilizer (G), the polyester composition can exhibit improved heat resistance, good mechanical properties, and a high degree of structural order. For example, when the other polymer (F) is polypropylene, nylon 6, or a combination thereof, the compatibilizer (G) is preferably a styrene-ethylene / butylene-styrene copolymer.

[0050] <Method for Preparing Polyester Composition>

[0051] The method for preparing the polyester composition is not particularly limited. For example, polyethylene terephthalate (A), inorganic powder (B), crystal nucleating agent (C), lubricant (D), and antioxidant (E) are placed in a blender and stirred until uniformly mixed into a solution. If necessary, other polymers (F) and compatibilizers (G) may be added. After uniform mixing, a liquid polyester composition can be obtained.

[0052] <Products>

[0053] An exemplary embodiment of the present invention provides a product made by using the polyester composition as engineering plastic pellets.

[0054] For example, a polyester composition, as an engineering plastic pellet, can be processed into a finished product. The processing method is not particularly limited, and an appropriate method can be selected based on the needs. Processing methods may include extrusion molding, injection molding, sheet metal processing, or other suitable processing methods.

[0055] The temperature of the forming mold during the processing process can be below 90°C, preferably between 60°C and 80°C. This allows the molded product to proceed directly to subsequent steps without first cooling it down, thereby improving production efficiency and reducing energy consumption.

[0056] Hereinafter, the present invention will be described in detail with reference to examples. The following examples are provided to describe the present invention, and the scope of the present invention includes the scope described in the following claims and its substitutes and modifications, and is not limited to the scope of the examples.

[0057] Example

[0058] In order to demonstrate that the polyester composition proposed in the present invention has excellent mechanical properties and further has good heat resistance, the following experimental example is specifically described.

[0059] The components and amounts of the polyester compositions of Examples 1 to 3 and Comparative Example 1 are listed in Table 1. The prepared polyester compositions were analyzed using the following test methods, and the results are shown in Table 1.

[0060] Test method

[0061] Heat deflection temperature (HDT): Tested according to ASTM D648 at a pressure of 0.45 MPa. The resulting value represents the polyester composition's resistance to heat deformation. A higher value indicates greater heat resistance.

[0062] Tensile Strength: Tested according to ASTM D638. The resulting value represents the total energy a polyester composition can withstand during tensile deformation. A higher value indicates a higher tensile strength.

[0063] Flexural Strength: Tested according to ASTM D790. The resulting value represents the polyester composition's ability to resist bending deformation. A higher value indicates a higher flexural strength.

[0064] Impact strength: Tested according to ASTM D256. The resulting value (kg-cm / cm) represents the total energy the polyester composition can withstand at break. A higher value indicates a higher impact strength (or resistance strength) for the polyester composition.

[0065] Crystallinity: This is measured using differential scanning calorimetry (DSC). The resulting value represents the ratio of the crystalline portion of the polyester composition to the total amount of the polyester composition. A higher value indicates a higher degree of structural order in the polyester composition.

[0066] [Table 1]

[0067]

[0068] *Surlyn 8920 is a trade name manufactured by DuPont.

[0069] As shown in Table 1, the polyester compositions of Examples 1-3, which include inorganic powder (B), have heat deformation temperatures greater than or equal to 100°C, indicating excellent heat resistance. They also possess good mechanical properties and a high degree of structural order, making them suitable for subsequent processing into finished products. In contrast, the polyester composition of Comparative Example 1, which does not include inorganic powder (B), has a heat deformation temperature of less than 100°C, indicating poor heat resistance.

[0070] Furthermore, compared to the polyester composition (Example 1) without the other polymer (F) and compatibilizer (G), the polyester compositions (Examples 2-3) containing the other polymer (F) and compatibilizer (G) exhibited higher heat distortion temperatures, i.e., better heat resistance. This demonstrates that when the polyester composition includes the other polymer (F) and compatibilizer (G), it can exhibit both better heat resistance and excellent mechanical properties and structural order.

[0071] Furthermore, the polyester compositions of Examples 1-3, which do not include glass fibers, exhibit excellent heat resistance, mechanical properties, and structural order, resulting in excellent processability and suitability for subsequent processing into finished products. In contrast, currently known polyester compositions containing glass fibers exhibit high hardness and brittleness, resulting in poor flowability and difficulty in further application, i.e., poor processability.

[0072] Furthermore, when the polyester compositions of Examples 1-3 of this embodiment, which do not include glass fiber but include inorganic powder (B), are processed as engineering plastic pellets, they can be injection molded at low mold temperatures (e.g., below 90°C) without subsequent post-crystallization, thereby improving product production efficiency and reducing energy consumption. In contrast, currently known polyester compositions without glass fiber, when processed as engineering plastic pellets, require injection molding at high mold temperatures (e.g., above 120°C) or injection molding at low mold temperatures followed by post-crystallization. Both methods of producing products involve high-temperature crystallization, requiring cooling before subsequent processing, increasing process steps and time, and thus reducing product production efficiency.

[0073] In summary, when the polyester composition of the present invention includes an inorganic powder (B), the polyester composition has excellent heat resistance, mechanical properties, and structural order, and is suitable for subsequent processing into products. In particular, the products can be molded (e.g., by injection molding) at low mold temperatures (e.g., below 90°C). This can be applied to products that require good heat resistance, such as tableware, buckles, and zippers, thereby achieving the goal of material uniformity.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polyester composition comprising: Polyethylene terephthalate (A); Inorganic powder (B); Nucleating agent (C); Lubricant (D); as well as Antioxidant (E).

2. The polyester composition of claim 1, wherein the polyester composition does not include glass fibers. 3 . The polyester composition according to claim 1 , wherein the polyethylene terephthalate (A) has an intrinsic viscosity of 0.7 to 1 dL / g.

4. The polyester composition according to claim 1, wherein the inorganic powder (B) comprises talc, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate whiskers or a combination thereof.

5. The polyester composition according to claim 1, wherein the crystal nucleating agent (C) comprises a sodium salt of an organic acid. 6 . The polyester composition according to claim 1 , wherein the lubricant (D) comprises stearates, polyethylene wax, modified silicone, fluorine-based resin or a combination thereof.

7. The polyester composition according to claim 1, wherein the antioxidant (E) comprises a hindered phenol antioxidant, a phenol antioxidant, a phosphite antioxidant, a composite antioxidant or a combination thereof.

8. The polyester composition according to claim 1, further comprising another polymer (F), a compatibilizer (G) or a combination thereof, The other polymer (F) does not include the polyethylene terephthalate (A).

9. The polyester composition according to claim 8, wherein the other polymer (F) comprises polypropylene, nylon 6, nylon 66, nylon 12 or a combination thereof.

10. The polyester composition according to claim 8, wherein the compatibilizer (G) comprises ethylene-methyl acrylate-glycidyl methacrylate terpolymer, polyethylene octene grafted glycidyl methacrylate, styrene-ethylene / butylene-styrene copolymer, styrene-ethylene / butylene-styrene block copolymer grafted maleic anhydride, or a combination thereof.

11. The polyester composition according to claim 8, wherein based on 100 parts by weight of the total amount of the polyester composition, the amount of the other polymer (F) is 2.5 to 35 parts by weight, and the amount of the compatibilizer (G) is 5 to 20 parts by weight.

12. The polyester composition according to claim 1, wherein based on 100 parts by weight of the total amount of the polyester composition, the polyethylene terephthalate (A) is used in an amount of 30 to 80 parts by weight, the inorganic powder (B) is used in an amount of 5 to 30 parts by weight, the crystal nucleating agent (C) is used in an amount of 0.5 to 15 parts by weight, the lubricant (D) is used in an amount of 0.05 to 1 part by weight, and the antioxidant (E) is used in an amount of 0.1 to 1 part by weight.

13. A product made by using the polyester composition according to any one of claims 1 to 12 as engineering plastic pellets.

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