Modified polyester material, polyester composition and product thereof

Abstract

PURPOSE: To provide a modified polyester material, a polyester composition, and a product thereof having excellent physical properties and heat resistance.SOLUTION: A modified polyester material includes a polyester raw material (A), a crystal nucleating agent (B), a transesterification inhibitor (C), a lubricant (D), and an antioxidant (E). The polyester raw material (A) includes a polyethylene terephthalate virgin resin, a recycled polyethylene terephthalate, or a combination thereof.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to polyester materials, and more particularly to modified polyester materials, polyester compositions, and articles thereof. [Background technology]

[0002] With growing environmental awareness, carbon emissions reduction and ESG indicators have become the direction and goal of initiatives by countries and brands in recent years. By modifying polybutylene terephthalate (PBT) with glass fiber and flame retardants, it can be given excellent dielectric properties, leading to its widespread use in electronics, automobiles, industrial valve parts, and other fields. However, due to its low recyclability and unstable recycling sources, products made using PBT are gradually failing to meet end-user demands for environmental protection and carbon reduction. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides modified polyester materials, polyester compositions, and articles thereof that have excellent physical properties and heat resistance. [Means for solving the problem]

[0004] The modified polyester material of the present invention comprises a polyester raw material (A), a nucleating agent (B), a transesterification inhibitor (C), a lubricant (D), and an antioxidant (E). The polyester raw material (A) comprises virgin polyethylene terephthalate (PET) resin, recycled polyethylene terephthalate (RPET), or a combination thereof.

[0005] In one embodiment of the present invention, the intrinsic viscosity (IV) of the polyester raw material (A) is 0.7 dL / g to 0.9 dL / g.

[0006] In one embodiment of the present invention, the nucleating agent (B) described above comprises an organic nucleating agent, an inorganic nucleating agent, or a combination thereof.

[0007] In one embodiment of the present invention, the transesterification inhibitor (C) described above comprises a phosphite ester compound, a phosphate ester compound, or a combination thereof.

[0008] In one embodiment of the present invention, the aforementioned lubricant (D) comprises stearates, polyethylene wax, siloxane modifiers, fluororesins, or combinations thereof.

[0009] In one embodiment of the present invention, the antioxidant (E) includes a hindered phenol antioxidant, a phenol antioxidant, a phosphite antioxidant, a complex antioxidant, or a combination thereof.

[0010] In one embodiment of the present invention, relative to a total of 100 parts by weight of the modified polyester material, the amount of polyester raw material (A) used is 70 to 90 parts by weight, the amount of nucleating agent (B) used is 8 to 20 parts by weight, the amount of transesterification inhibitor (C) used is 0.5 to 2 parts by weight, the amount of lubricant (D) used is 0.2 to 2 parts by weight, and the amount of antioxidant (E) used is 0.5 to 2 parts by weight.

[0011] The polyester composition of the present invention comprises the modified polyester material described above, polybutylene terephthalate, and a reinforcing material.

[0012] In one embodiment of the present invention, the content of recycled polyethylene terephthalate is 20% by weight to 40% by weight based on the total weight of the polyester composition.

[0013] In one embodiment of the present invention, the amount of modified polyester material used is 25 to 45 parts by weight, the amount of polybutylene terephthalate used is 30 to 55 parts by weight, and the amount of reinforcing material used is 20 to 40 parts by weight, relative to a total of 100 parts by weight of the polyester compositions used.

[0014] The articles of manufacture of the present invention are made using the above-described polyester compositions as engineering plastic pellets. [Effects of the Invention]

[0015] As described above, the modified polyester material of the present invention is modified by adding a nucleating agent (B), an ester exchange inhibitor (C), a lubricant (D), and an antioxidant (E) to the polyester raw material (A). This allows the modified polyester material to have excellent crystallization rate, fluidity, mechanical properties, heat resistance, and processability. The modified polyester material of the present invention can also incorporate polybutylene terephthalate to form a polyester composition. This allows the polyester composition to have excellent crystallinity, heat resistance, and mechanical properties. Furthermore, the polyester composition of the present invention can be processed into engineering plastic pellets, thereby improving the properties of incorporating environmentally friendly recycled materials into products and reducing carbon emissions.

[0016] In order to make the above features and advantages of the present invention clearer and easier to understand, the present invention will be described in detail below with reference to the following embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following are embodiments that describe the contents of the present invention in detail. The implementation details provided in the embodiments are merely examples and are not intended to limit the protection scope of the contents of the present invention. Those skilled in the art can modify or change these implementation details according to the needs of actual implementation. Furthermore, descriptions of well-known devices, methods, and materials may be omitted so as not to obscure the description of various principles of the present invention.

[0018] Ranges can be expressed herein as from "about" one particular value to "about" another particular value, and thus may be expressed directly as from one particular value and / or to another particular value. When a range is expressed, another embodiment includes from one particular value and / or to another particular value. Similarly, when values ​​are expressed as approximations, using the antecedent "about," it is understood that the particular value forms another embodiment. It should also be understood that the endpoints of each range are either explicitly related or independent of the other endpoint.

[0019] As used herein, non-limiting terms (e.g., can, can, for example, or other similar terms) refer to optional or selective implementation, inclusion, addition, or presence.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It is further understood that terms (such as those defined in commonly used dictionaries) should be interpreted to have a meaning consistent with their meaning in the relevant technical context, and should not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0021] <Modified polyester material> The present invention provides a modified polyester material comprising a polyester raw material (A), a nucleating agent (B), an ester interchange inhibitor (C), a lubricant (D), and an antioxidant (E). The modified polyester material of the present invention may further comprise other suitable additives, if necessary. Each of the above components will be described in detail below.

[0022] Polyester raw material (A) The polyester raw material (A) may include virgin polyethylene terephthalate resin, recycled polyethylene terephthalate, or a combination thereof. Sources of recycled polyethylene terephthalate include recycled pellets from packaging materials, recycled pellets from film materials, recycled pellets from textiles, recycled polyester pellets from industrial recycling, or other suitable polyethylene terephthalate products, which can meet the requirements for recycled material introduction, but the present invention is not limited thereto. Recycled pellets from packaging materials may include recycled pellets from bottles (e.g., recycled pellets from PET bottles), recycled pellets from trays, or other suitable packaging material products.

[0023] In this embodiment, the intrinsic viscosity of the polyester raw material (A) is 0.7 dL / g to 0.9 dL / g, and more preferably 0.72 dL / g to 0.82 dL / g. If the intrinsic viscosity of the polyester raw material (A) is less than 0.7 dL / g, the impact strength of the polyester raw material (A) may be too low, resulting in a polyester composition containing the modified polyester material or a product thereof suffering from insufficient strength and / or brittleness. If the intrinsic viscosity of the polyester raw material (A) is more than 0.9 dL / g, the viscosity of the polyester raw material (A) may be too high, resulting in poor flowability of the polyester composition containing the modified polyester material, making it difficult to apply to subsequent processing steps.

[0024] The amount of polyester raw material (A) used is 70 to 90 parts by weight, more preferably 80 to 85 parts by weight, relative to 100 parts by weight of the total amount of modified polyester materials used.

[0025] Nucleating agent (B) The nucleating agent (B) is not particularly limited, and an appropriate nucleating agent can be selected as needed. In this embodiment, the nucleating agent (B) can include an organic nucleating agent, an inorganic nucleating agent, or other appropriate nucleating agent, and more preferably a combination of an organic nucleating agent and an inorganic nucleating agent. When a combination of an organic nucleating agent and an inorganic nucleating agent is used, the ratio of the amount of the organic nucleating agent to the amount of the inorganic nucleating agent is 1:4 to 4:1, more preferably 1:2 to 2:1.

[0026] For example, the organic nucleating agent may include a sodium salt of an organic acid or other suitable organic nucleating agent. The sodium salt of an organic acid may include sodium benzoate, sodium montanate, EMAA (trade name: Surlyn resin, manufactured by DuPont), or other suitable sodium salt of an organic acid, more preferably sodium benzoate, EMAA (trade name), or a combination thereof. The inorganic nucleating agent may include a micro-nanometer scale inorganic powder or other suitable inorganic nucleating agent. The micro-nanometer scale inorganic powder may include talc, titanium dioxide, silicon dioxide, calcium carbonate, or other suitable inorganic powder, more preferably talc.

[0027] The amount of the nucleating agent (B) used is 8 to 20 parts by weight, more preferably 12 to 18 parts by weight, relative to 100 parts by weight in total of the amount of modified polyester materials used.

[0028] When the modified polyester material contains the nucleating agent (B), the crystallization rate of the modified polyester material can be improved, and its heat resistance can be effectively enhanced. Transesterification inhibitor (C)

[0029] The transesterification inhibitor (C) is not particularly limited, and an appropriate transesterification inhibitor can be selected as needed. In this embodiment, the transesterification inhibitor (C) can include a phosphite ester compound, a phosphate ester compound, or other appropriate transesterification inhibitor. For example, the transesterification inhibitor (C) can include a phosphite ester, triphenyl phosphate, triphenyl phosphite, or other appropriate transesterification inhibitor, and is more preferably a phosphite ester.

[0030] The amount of the transesterification inhibitor (C) used is 0.5 to 2 parts by weight, more preferably 0.5 to 1 part by weight, based on 100 parts by weight of the total amount of modified polyester materials used.

[0031] When the modified polyester material contains the transesterification inhibitor (C), when the modified polyester material is introduced into polybutylene terephthalate to form a polyester composition, the transesterification reaction that tends to occur between the polyterephthalic acid ethyl ester and the polybutylene terephthalate can be inhibited, thereby preventing the polyterephthalic acid ethyl ester and the polybutylene terephthalate from decomposing, and thereby improving the impact strength and mechanical properties of the polyester composition.

[0032] Lubricant (D) The lubricant (D) is not particularly limited, and an appropriate lubricant can be selected as needed. In this embodiment, the lubricant (D) can include stearates, polyethylene wax, siloxane-modified products, fluorine-based resins, or other appropriate lubricants, and is more preferably polyethylene wax.

[0033] The amount of lubricant (D) used is 0.2 to 2 parts by weight, more preferably 0.5 to 1 part by weight, relative to 100 parts by weight in total of the amount of modified polyester materials used.

[0034] When the modified polyester material contains the lubricant (D), the flowability of the modified polyester material can be improved, which helps improve the flowability and mold release properties in subsequent processing steps (e.g., injection molding) when the modified polyester material is incorporated into polybutylene terephthalate to form a polyester composition.

[0035] Antioxidant (E) The antioxidant (E) is not particularly limited, and an appropriate antioxidant can be selected as needed. In this embodiment, the antioxidant (E) can include a hindered phenol antioxidant, a phenol antioxidant, a phosphite ester antioxidant, a complex antioxidant, or other suitable antioxidants, and is more preferably a complex antioxidant. For example, the complex antioxidant can include a combination of a hindered phenol antioxidant (e.g., Antioxidant 1010) and a phosphite ester antioxidant (e.g., Antioxidant 168) or other suitable antioxidant combinations. The mixing weight ratio of the hindered phenol antioxidant to the phosphite ester antioxidant can be 3:1 to 1:3, and more preferably 2:1 to 1:2.

[0036] The amount of antioxidant (E) used is 0.5 to 2 parts by weight, more preferably 0.5 to 1 part by weight, relative to 100 parts by weight in total of the amount of modified polyester materials used.

[0037] When the modified polyester material contains an antioxidant (E), the heat resistance and processability of the modified polyester material can be improved.

[0038] <Polyester composition> One exemplary embodiment of the present invention provides a polyester composition comprising the modified polyester material described above, polybutylene terephthalate, and a reinforcing material. The polyester composition of the present invention may further comprise other suitable additives, if necessary.

[0039] The polybutylene terephthalate is not particularly limited, and an appropriate polybutylene terephthalate can be selected as needed. For example, the polybutylene terephthalate can include flame-retardant polybutylene terephthalate or non-flame-retardant polybutylene terephthalate. Specific examples of commercially available flame-retardant polybutylene terephthalate include Chang Chun PBT2000 series (trade name; manufactured by Chang Chun Plastics Co., Ltd.) or other suitable flame-retardant polybutylene terephthalate. Specific examples of commercially available non-flame-retardant polybutylene terephthalate include Chang Chun PBT1200 (trade name; manufactured by Chang Chun Plastics Co., Ltd.) or other suitable flame-retardant polybutylene terephthalate.

[0040] The reinforcing material is not particularly limited, and an appropriate reinforcing material can be selected as needed. For example, the reinforcing material can include glass fiber, carbon fiber, boron fiber, or other appropriate reinforcing material, and more preferably, glass fiber.

[0041] In this embodiment, the content of recycled polyethylene terephthalate in the polyester raw material (A) in the modified polyester material is 20% by weight to 40% by weight, more preferably 25% by weight to 35% by weight, based on the total weight of the polyester composition. When the polyester composition is processed into engineering plastic pellets, the product can be improved in terms of introducing environmentally friendly recycled materials and reducing carbon emissions.

[0042] The amount of modified polyester material used is 25 to 45 parts by weight, more preferably 31 to 40 parts by weight, relative to 100 parts by weight of the total amount of polyester composition used. The amount of polybutylene terephthalate used is 30 to 55 parts by weight, more preferably 33 to 40 parts by weight. The amount of reinforcing material used is 20 to 40 parts by weight, more preferably 25 to 35 parts by weight.

[0043] <Product> One exemplary embodiment of the present invention provides an article of manufacture made using the above-described polyester composition as an engineering plastic pellet.

[0044] For example, the polyester composition can be processed into engineering plastic pellets to produce a product. The processing method is not particularly limited, and an appropriate processing method can be selected as needed. The processing method can include other appropriate processing methods such as extrusion molding, injection molding, and plate processing.

[0045] The present invention will now be described in detail with reference to examples. The following examples are provided to illustrate the present invention, and the scope of the present invention is not limited to the scope of the examples, including the scope set forth in the following claims and their alternatives and modifications.

[0046] Example Examples of modified polyester materials 81.5 parts by weight of recycled polyethylene terephthalate (intrinsic viscosity 0.746 dL / g), 16 parts by weight of nucleating agent (organic nucleating agent to inorganic nucleating agent ratio 1:1, where the organic nucleating agent is a combination of sodium benzoate and EMAA (mixed weight ratio 1:15), and the inorganic nucleating agent is talc), 1 part by weight of phosphite ester, 0.5 parts by weight of polyethylene wax, and 1 part by weight of composite antioxidant (antioxidant 1010 and antioxidant 168 mixed in a 1:1 weight ratio) were placed in a stirrer and stirred until uniformly mixed and formed into a solution. Other additives may be added as needed, and after uniform mixing, a liquid modified polyester material was obtained.

[0047] Polyester Composition Examples The types of components and the amounts used of the polyester compositions of Examples 1 and 2 and Comparative Examples 1 to 4 are shown in Table 1 below. The obtained polyester compositions were analyzed by the following test methods, and the results are shown in Table 1.

[0048] Test Method Impact strength: Testing is performed based on the ASTM D256 standard. The resulting value (kg-cm / cm) represents the total amount of energy that the polyester composition can withstand at break. The higher the value, the higher the impact strength (or resistance of the polyester composition) that the polyester composition can withstand.

[0049] Tensile strength: Testing is performed based on the standard ASTM D638. The obtained value is the total amount of energy that the polyester composition can withstand when tensile deformed. The higher the value, the higher the tensile strength that the polyester composition can withstand.

[0050] Flexural strength: The test is performed according to the standard of ASTM D790. The obtained value is the ability of the polyester composition to resist bending deformation. The higher the value, the higher the bending strength that the polyester composition can withstand.

[0051] Flexural modulus: Testing is performed based on the standard ASTM D790. The obtained value is the total amount of energy resisting bending deformation of the polyester composition. The higher the value, the higher the rigidity of the polyester composition.

[0052] Heat deflection temperature (HDT): Tested under a pressure of 1.82 MPa according to ASTM D648. The resulting value indicates the polyester composition's ability to resist heat deflection. The higher the value, the higher the heat resistance of the polyester composition.

[0053] Gloss: The test is performed based on the standard of ASTM D523. The obtained value is the ability of the polyester composition to reflect light on the surface of the test piece. The higher the value, the brighter the surface of the test piece.

[0054] Shrinkage rate: The test is conducted based on the ASTM D955 standard. The obtained value is the percentage difference between the dimensions of the product made from the polyester composition after cooling and solidifying it and demolding it and the dimensions of the original mold. The smaller the value, the closer the dimensions of the product are to the dimensions of the original mold.

[0055] Flame retardancy test: The test is conducted according to the UL94 standard. The thickness of the test specimen is 1.5 mm. The obtained value is the ability of the polyester composition to suppress or resist the spread of flame.

[0056] [Table 1] *Actual RPET content: The recycled polyethylene terephthalate content based on the total weight of the polyester composition. *Glass fiber (product number 3786): A single fiber with a diameter of 10 microns and a length of 4.5 millimeters.

[0057] As can be seen from Table 1, Examples 1 and 2, in which the polyester composition contains the modified polyester material of this embodiment, have a recycled polyethylene terephthalate content of approximately 30 wt% based on the total weight of the polyester composition. In other words, the polyester composition has the property of incorporating environmentally friendly recycled materials into the product to reduce carbon emissions, and has excellent impact strength, tensile strength, flexural strength, flexural modulus, heat distortion temperature, gloss, and shrinkage. Furthermore, when the polyester composition contains flame-retardant polybutylene terephthalate (Example 2), the polyester composition can pass the flame retardancy test. In contrast, Comparative Examples 1 and 2, in which the polyester composition contains only the polyester material polybutylene terephthalate, do not contain any environmentally friendly recycled materials and therefore cannot achieve the property of incorporating environmentally friendly recycled materials into the product to reduce carbon emissions.

[0058] Furthermore, with regard to the polyester compositions incorporating environmentally friendly recycled materials, the polyester compositions containing the modified polyester material of this embodiment (Examples 1 and 2) have better impact strength, tensile strength, flexural strength, heat distortion temperature, and gloss than the polyester compositions not containing the modified polyester material of this embodiment (Comparative Examples 3 and 4).

[0059] Furthermore, with regard to polyester compositions containing non-flame retardant polybutylene terephthalate, the polyester composition containing the modified polyester material of this embodiment (Example 1) has superior impact strength, tensile strength, flexural strength, flexural modulus, heat distortion temperature, and gloss, compared to a polyester composition not containing the modified polyester material of this embodiment (Comparative Example 3).

[0060] Furthermore, with regard to polyester compositions containing flame-retardant polybutylene terephthalate, the polyester composition containing the modified polyester material of this embodiment (Example 2) has superior impact strength, tensile strength, flexural strength, flexural modulus, heat distortion temperature, and gloss, compared to a polyester composition not containing the modified polyester material of this embodiment (Comparative Example 4).

[0061] As described above, the modified polyester material of the present invention comprises polyester raw material (A), nucleating agent (B), transesterification inhibitor (C), lubricant (D), and antioxidant (E). The polyester composition containing these components has the advantage of incorporating environmentally friendly recycled materials to reduce carbon emissions, and has excellent impact strength, tensile strength, flexural strength, flexural modulus, heat distortion temperature, gloss, and shrinkage. The polyester composition of the present invention combines the advantages of polyethylene terephthalate and polybutylene terephthalate, resulting in excellent dielectric properties, heat resistance, mechanical properties, and gloss, making it suitable for wide applications in electronics, automobiles, industrial valve parts, and other fields.

[0062] Although the present invention has been described in detail with reference to the above embodiments, they are not intended to limit the present invention. Those skilled in the art will understand that changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the following claims. [Industrial Applicability]

[0063] The modified polyester materials, polyester compositions, and products thereof of the present invention can be used in fields such as electronics, automobiles, industrial valve parts, etc.

Claims

1. A polyester raw material (A) comprising virgin polyethylene terephthalate resin, recycled polyethylene terephthalate, or a combination thereof; a nucleating agent (B); a transesterification inhibitor (C); A lubricant (D), an antioxidant (E); A modified polyester material comprising:

2. 2. The modified polyester material according to claim 1, wherein the intrinsic viscosity of the polyester raw material (A) is 0.7 dL / g to 0.9 dL / g.

3. 10. The modified polyester material of claim 1, wherein the nucleating agent (B) comprises an organic nucleating agent, an inorganic nucleating agent, or a combination thereof.

4. 2. The modified polyester material of claim 1, wherein the transesterification inhibitor (C) comprises a phosphite ester compound, a phosphate ester compound, or a combination thereof.

5. 10. The modified polyester material of claim 1, wherein the lubricant (D) comprises stearates, polyethylene wax, siloxane modifiers, fluororesins, or combinations thereof.

6. 2. The modified polyester material of claim 1, wherein the antioxidant (E) comprises a hindered phenol antioxidant, a phenol antioxidant, a phosphite antioxidant, a complex antioxidant, or a combination thereof.

7. The modified polyester material according to claim 1, wherein the amount of the polyester raw material (A) used is 70 to 90 parts by weight, the amount of the nucleating agent (B) used is 8 to 20 parts by weight, the amount of the transesterification inhibitor (C) used is 0.5 to 2 parts by weight, the amount of the lubricant (D) used is 0.2 to 2 parts by weight, and the amount of the antioxidant (E) used is 0.5 to 2 parts by weight, relative to a total of 100 parts by weight of the modified polyester material used.

8. A modified polyester material according to any one of claims 1 to 7; Polybutylene terephthalate, A reinforcing material; A polyester composition comprising:

9. The polyester composition according to claim 8, wherein the content of the recycled polyethylene terephthalate is 20% by weight to 40% by weight based on the total weight of the polyester composition.

10. 9. The polyester composition according to claim 8, wherein the amount of the modified polyester material used is 25 to 45 parts by weight, the amount of the polybutylene terephthalate used is 30 to 55 parts by weight, and the amount of the reinforcing material used is 20 to 40 parts by weight, relative to a total of 100 parts by weight of the polyester composition used.

11. 9. An article of manufacture produced using the polyester composition of claim 8 as engineering plastic pellets.

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