Polycarbonate - polyethylene terephthalate alloy material

Abstract

PURPOSE: To provide an alloy material of polycarbonate-polyethylene terephthalate that exhibits high impact resistance strength and heat resistance, and may reduce carbon emissions.SOLUTION: An alloy material of polycarbonate-polyethylene terephthalate includes the following components: a polycarbonate, a polyethylene terephthalate, a transesterification inhibitor, and a compatibilizer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to polycarbonate - polyethylene terephthalate Alloy material .

Background Art

[0002] Polycarbonate (PC) is widely used in fields such as home appliances and automobiles due to its excellent mechanical properties and good processing properties. However, PC is a material with a high carbon emission, and its carbon emission is about 9 kgCO2 / kg to 9.5 kgCO2 / kg.

Summary of the Invention

Problems to be Solved by the Invention

Means for Solving the Problems

[0003] The carbon emission of virgin polyethylene terephthalate (PET) is only 2.6 kgCO2 / kg to 3.0 kgCO2 / kg. Therefore, PET is an environmentally friendly plastic material. Furthermore, PET is a material with a relatively high recycling rate among plastic materials, its recycling source is stable, and different types of recycled PET can be easily distinguished by the recycling source. In this way, PET of various colors (for example, transparent, white, or other colors) can be recycled and made suitable for various processed products. Products made from recycled PET (r - PET) can further reduce the carbon footprint of product manufacturing.

Means for Solving the Problems

Means for Solving the Problems

[0004] The present invention has the advantages of high impact strength and heat resistance, and can reduce the carbon emissions required for material production by adding PET. Polycarbonate (PC) - ​Of polyethylene terephthalate (PET) Alloy material to provide it.

[0005] The polycarbonate - polyethylene terephthalate of the present invention Alloy material comprises components of polycarbonate, polyethylene terephthalate, an ester - exchange inhibitor, and a compatibilizer. The ester - exchange inhibitor includes at least one of a phosphite - based ester - exchange inhibitor and a phosphate - based ester - exchange inhibitor. The compatibilizer includes at least one of a maleic anhydride graft copolymer, an ethylene - methyl acrylate - glycidyl methacrylate copolymer, a polyolefin elastomer graft glycidyl methacrylate, a polyethylene graft glycidyl methacrylate, and an acrylonitrile - butadiene - styrene graft glycidyl methacrylate. Alloy material Based on the total weight thereof, the weight percentage of the ester - exchange inhibitor is 0.5 wt% to 2 wt%, and the weight percentage of the compatibilizer is 6 wt% to 15 wt%.

Advantages of the Invention

[0006] As described above, by adding an ester - exchange inhibitor, the ester - exchange reaction between PET and PC is suppressed, and thereby, by - products (water or alcohol) that crack PC - PET generated by the ester - exchange reaction can be reduced. At the same time, by adding a compatibilizer, the compatibility between PC and PET is improved, and a decrease in impact strength caused by large - scale phase separation can be avoided. Alloy material

Modes for Carrying Out the Invention

Embodiments of the Invention

[0007] Hereinafter, embodiments of the present invention will be described in detail. However, these embodiments are exemplary and do not limit the disclosure of the present invention.

[0008] Here, the range indicated by "from one numerical value to another numerical value" is a schematic representation method to avoid listing all the numerical values within the range one by one in the specification. Therefore, the recording of a specific numerical range covers any numerical value within the numerical range and any relatively small numerical range defined by any numerical value within the numerical range, which is the same as if any numerical value and such a relatively small numerical range were clearly stated in the specification.

[0009] Polycarbonate (PC) is a commonly used high-performance engineering plastic with many advantages such as high strength, wear resistance, high transparency, heat resistance, chemical resistance, and weather resistance. Therefore, PC is widely used in fields such as electronic devices, automobiles, construction, and medical devices. Although PC has many advantages, due to the carbon emissions required to produce PC and the unstable recycling sources of PC, products manufactured using PC are gradually failing to meet the needs of environmental protection. To mitigate this problem, the present invention melts / mixes polyethylene terephthalate (PET), which has a relatively low carbon emission, with PC, and as a result, the obtained PC-PET Alloy material not only retains the advantages of high impact strength and heat resistance but also has the advantage of being environmentally friendly.

[0010] PC-PET Alloy material In order for PC-PET to have sufficiently excellent properties, in the manufacturing process of PC-PET Alloy material not only PC and PET need to be added, but also other additives such as transesterification inhibitors, compatibilizers, reinforcing agents, lubricants, crystallization inhibitors, and antioxidants are required. In some embodiments, colorants, flame retardants, sensitizers, anti-dripping agents, etc. may be added to PC-PET Alloy material PC-PET Alloy material For each component in PC-PET, it will be described below.

[0011] Polycarbonate (PC) The PC may include virgin PC, recycled PC, or a combination thereof. Virgin PC is generally an existing new PC. Recycled PC may be a physically recycled PC. In some embodiments, the ultimately synthesized PC-PET Alloy material For the total weight of, the weight percentage of PC is 30 wt% to 50 wt%.

[0012] Polyethylene terephthalate (PET) PET may include virgin PET, recycled PET, or a combination thereof. Virgin PET is generally an existing new PET. Recycled PET may include physically recycled PET and / or chemically recycled PET.

[0013] For example, the method of obtaining recycled PET includes collecting various types of waste polyester resin materials. The waste polyester resin materials are classified by type, color, and use. Further, the waste polyester resin materials are compressed and packaged, and then transported to a waste treatment plant.

[0014] In some embodiments, the waste polyester resin materials are recycled PET bottles, film materials, fibers, etc., but the present invention is not limited thereto. Remove other components on the waste polyester resin material (for example, the cap, label, adhesive of the PET bottle). Next, the waste polyester resin material is cut and crushed to obtain a processed recycled polyester material (that is, recycled polyethylene terephthalate (r-PET)), which facilitates the subsequent manufacturing process.

[0015] In a continuous process, next, the crushed r-PET fragments are melted at a high temperature in an extruder to form an r-PET molten material. The extruder may include a single-screw extruder, a twin-screw extruder, a planetary extruder, etc.

[0016] Subsequently, in a continuous process, the r-PET molten material is introduced into a pressure-controlled liquid thickening extrusion system. In this extrusion system, the material can be heated to a temperature of 230°C to 300°C for 15 minutes to 60 minutes under a low air pressure of 1 millibar (mbar) to 6 mbar, so that the intrinsic viscosity of the r-PET molten material can be increased, and the effect of forming a recycled polyester resin can be obtained. The recycled polyester resin (i.e., r-PET) has an intrinsic viscosity (IV) of 0.6 dL / g to 0.86 dL / g and has.

[0017] In some embodiments, the intrinsic viscosity of r-PET is controlled to optimize the subsequent manufacturing process of PC-PET Alloy Material of.

[0018] In a continuous process, the material properties of r-PET may be modified by a modified extruder.

[0019] First, modifiers such as transesterification inhibitors and compatibilizers are uniformly mixed based on the ratio, and then, using a loss-in-weight feeder, they are introduced into the modified extruder based on the ratio and mixed with the recycled polyester resin in a molten state to form physically recycled modified polyester particles with different functions. The types of modified extruders include single-screw extruders, twin-screw extruders, planetary extruders, etc. In some embodiments, in addition to the modification by transesterification inhibitors and compatibilizers, reinforcing agents, lubricants, crystallization inhibitors, antioxidants, etc. are also added to the modified extruder to modify r-PET.

[0020] In some embodiments, for the total weight of the finally synthesized PC-PET Alloy material the weight percentage of PET is 50 wt% to 70 wt%. Generally, PET has less carbon emissions and a stable recycling source. Therefore, in order to be more environmentally friendly, PC-PET Alloy materialIt is better to make the content of PET in it more than the content of PC.

[0021] Transesterification inhibitor When PC and PET are kneaded / mixed, a transesterification reaction may occur between PC and PET. By-products (water or alcohol) generated by the transesterification reaction can cause problems such as cracking of the polyester, reduction in molecular weight, deterioration, embrittlement of the material (decrease in impact resistance), etc., resulting in both PC and PET losing good mechanical properties.

[0022] To avoid excessive transesterification reaction, it is necessary to add an appropriate amount of transesterification inhibitor when kneading / mixing PC and PET. The transesterification inhibitor includes, for example, at least one of a phosphite-based transesterification inhibitor and a phosphate-based transesterification inhibitor. The phosphite-based transesterification inhibitor is, for example, triphenyl phosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, and the phosphate-based transesterification inhibitor is, for example, sodium dihydrogen phosphate, disodium hydrogen phosphate, disodium dihydrogen pyrophosphate, triphenyl phosphate.

[0023] Adding too much or too little transesterification inhibitor will have an adverse effect on the subsequently produced PC-PET Alloy material PC-PET Alloy material Based on the total weight of PC-PET, the weight percentage of the transesterification inhibitor is 0.5wt% - 2wt%, and 0.5wt% - 1wt% is preferred. When the weight percentage of the transesterification inhibitor is less than 0.5wt%, an excessive transesterification reaction occurs between PC and PET, and the heat resistance and processability of PC-PET Alloy material decrease. When the weight percentage of the transesterification inhibitor exceeds 2wt%, the compatibility between PET and PC becomes low, and problems such as a decrease in impact strength occur. Also, an excessive transesterification inhibitor increases the cost.

[0024] Compatibilizer The compatibilizer can be used to improve the compatibility between PC and PET, thereby controlling the dispersion size of PC and PET. For example, when one of PC and PET is the matrix phase and the other is the dispersed phase, the compatibilizer helps to disperse the dispersed phase more uniformly in the matrix phase, thereby preventing the separation of the two phases.

[0025] The combination of the transesterification inhibitor and the compatibilizer can improve the compatibility between PC and PET and simultaneously avoid the by-products generated by the transesterification reaction. An appropriate amount of the compatibilizer is desirable. The compatibilizer is, for example, maleic anhydride graft copolymer (such as maleic anhydride graft polyethylene (PE-MA), maleic anhydride graft polypropylene (PP-MA) , maleic anhydride graft acrylonitrile-butadiene-styrene (ABS-MA), ethylene-methyl acrylate copolymer (E-MAC), ethylene-methyl acrylate- glycidyl methacrylate copolymer (ethylene-methyl acrylate-glycidyl methacrylate copolymer, E-MA-GMA), polyolefin elastomer graft glycidyl methacrylate (POE-g-GMA), polyethylene It contains at least one of graft glycidyl methacrylate (polyethylene graft glycidyl methacrylate, PE-g-GMA) and acrylonitrile-butadiene-styrene graft glycidyl methacrylate (acrylonitrile-butadiene-styrene graft glycidyl methacrylate, ABS-g-GMA).

[0026] Adding too much or too little compatibilizer will affect the subsequently produced PC-PET Alloy material adversely. PC-PET Alloy material Based on the total weight of PC-PET, the weight percentage of the compatibilizer is 6wt% - 15wt%, preferably 8wt% - 12wt%. When the weight percentage of the compatibilizer is less than 6wt%, the compatibility between PC and PET is low, and PC and PET are easily phase-separated. When the weight percentage of the compatibilizer exceeds 15wt%, the impact strength and toughness of the material may be significantly improved. However, since the compatibilizer is an elastomeric material, the tensile strength, flexural strength, and heat resistance temperature will decrease significantly.

[0027] Reinforcing agent The reinforcing agent can be used to improve the impact strength of PC-PET Alloy material For example, the reinforcing agent can be used to improve the impact strength of the continuous phase in PC-PET Alloy material In some embodiments, in PC-PET Alloy material the continuous phase is PET and the dispersed phase contains PC.

[0028] In some embodiments, the reinforcing agent is a polyolefin elastomer (POE), AcrylateIt contains at least one of (acrylics, ACR), methyl acrylate-butadiene-styrene copolymer (MBS), ethylene-butyl acrylate-glycidyl methacrylate copolymer (PTW), or other suitable materials.

[0029] In some embodiments, PC-PET Alloy material With respect to the total weight of, the weight percentage of the reinforcing agent is 1 wt% to 5 wt%, preferably 2 wt% to 3 wt%.

[0030] Lubricant The lubricant can improve the fluidity of the material. By adding the lubricant to PC-PET Alloy material it is possible to facilitate the application of PC-PET in the injection molding process and the mold release process of mold forming. Alloy material

[0031] In some embodiments, the lubricant contains at least one of stearate, polyethylene wax, modified siloxane, fluororesin, or other suitable materials.

[0032] In some embodiments, PC-PET Alloy material With respect to the total weight of, the weight percentage of the lubricant is 0.1 wt% to 2 wt%, preferably 0.5 wt% to 1 wt%.

[0033] Crystallization inhibitor The crystallization inhibitor is used to reduce the crystallization rate of PET. Generally, since PC is an amorphous plastic, when the crystallinity of PET is too high, when PC and PET are kneaded / mixed, the two phases will separate due to the incompatibility between the crystalline phase and the amorphous phase. By reducing the crystallization rate of PET with a crystallization inhibitor, it is possible to obtain PET with low crystallinity or even amorphous PET, so the problem of phase separation can be avoided.

[0034] In some embodiments, the crystallization inhibitor includes at least one of a polyester modified by isophthalic acid (IPA) copolymerization (e.g., PET modified by 20% IPA copolymerization, i.e., IPET), a polyester modified by cyclohexanedimethanol (CHDM) copolymerization, and other suitable materials. The polyester modified by CHDM copolymerization is, for example, polyethylene terephthalate glycol-modified (PETG) modified by CHDM copolymerization or polyethylene cyclohexanedimethanol terephthalate (PCTG) modified by CHDM copolymerization. In some embodiments, the crystallization inhibitor includes at least one of a polyester modified by isophthalic acid (IPA) copolymerization (e.g., PET modified by 20% IPA copolymerization, i.e., IPET), a polyester modified by cyclohexanedimethanol (CHDM) copolymerization, and other suitable materials. The polyester modified by CHDM copolymerization is, for example, polyethylene terephthalate glycol-modified (PETG) modified by CHDM copolymerization or polyethylene cyclohexanedimethanol terephthalate (PCTG) modified by CHDM copolymerization. In some embodiments, the crystallization inhibitor includes at least one of a polyester modified by isophthalic acid (IPA) copolymerization (e.g., PET modified by 20% IPA copolymerization, i.e., IPET), a polyester modified by cyclohexanedimethanol (CHDM) copolymerization, and other suitable materials. The polyester modified by CHDM copolymerization is, for example, polyethylene terephthalate glycol-modified (PETG) modified by CHDM copolymerization or polyethylene cyclohexanedimethanol terephthalate (PCTG) modified by CHDM copolymerization.

[0035] In some embodiments, the weight percentage of the crystallization inhibitor is 0 wt% or more and 5 wt% or less based on the total weight of PC-PET. Alloy material In some embodiments, the weight percentage of the crystallization inhibitor is 0 wt% or more and 5 wt% or less based on the total weight of PC-PET.

[0036] Antioxidant In some embodiments, the antioxidant includes at least one of a phenolic antioxidant, a blend antioxidant, and a phosphite antioxidant.

[0037] In some embodiments, the weight percentage of the antioxidant is 0.5 wt% to 2 wt% based on the total weight of PC-PET. Alloy material In some embodiments, the weight percentage of the antioxidant is 0.5 wt% to 2 wt% based on the total weight of PC-PET.

[0038] The present invention also proposes a product made from PC-PET as engineering plastic particles by a processing method. The processing method can include extrusion molding, injection molding, die molding, or sheet processing. Alloy material The present invention also proposes a product made from PC-PET as engineering plastic particles by a processing method. The processing method can include extrusion molding, injection molding, die molding, or sheet processing.

[0039] The PC-PET of the present invention will be described in detail by the following experimental examples. However, the following experimental examples do not limit the present invention. Alloy material Using a transesterification inhibitor, compatibilizer, strengthening agent, lubricant, crystallization inhibitor, and antioxidant, r-PET polyester particles were modified to obtain first-modified r-PET polyester particles. The first-modified r-PET polyester particles contain 86.5 wt% of r-PET (IV is 0.

[0040] Experimental Example 8), 8 wt% of compatibilizer (E-MA-GMA), 2 wt% of strengthening agent (POE), 1 wt% of crystallization inhibitor (PET modified by copolymerization of 20% isophthalic acid), 0.5 wt% of lubricant (polyethylene wax), 1 wt% of transesterification inhibitor (phosphite, for example, tris(2,4-di-tert-butylphenyl) phosphite), and 1 wt% of antioxidant (blended antioxidant). Then, the first-modified r-PET polyester particles and PC were mixed at different ratios to obtain the PC-PETs of Examples 1 and 2 in Table 1. Allo y material Furthermore, acrylonitrile-butadiene-styrene (ABS) (AG12A0) from Formosa Chemicals & Fibre was provided as Comparative Example 1, and the PC-PETs obtained by mixing the first-modified r-PET polyester particles and PC without using a transesterification inhibitor, compatibilizer, strengthening agent, lubricant, crystallization inhibitor, and antioxidant were provided as Comparative Examples 2 and 3. Various property tests were performed on Comparative Examples 1 to 3, and the obtained results are shown in Table 1. Alloy material The ASTM standard test pieces produced in each example and comparative example were evaluated based on the following method. Specific gravity: The density of a substance relative to the density of pure water at 4°C. Tested according to ASTM D792 standard. Impact Strength: The test was conducted in accordance with ASTM D256 standard. The obtained value indicates the total energy that the test sample can withstand when it breaks. The larger the value, the more capable the test sample is of withstanding a greater impact strength (or the strength resistance of the test sample). The unit is kg-cm / cm. Tensile Strength: The test was conducted in accordance with ASTM D638 standard. The obtained value indicates the total energy that the test sample can withstand against tensile deformation. The larger the value, the more capable the test sample is of withstanding a greater tensile strength. The unit is MPa. Flexural Strength: Measured based on the ASTM D790 standard test method, and a value representing the resistance of the test piece to flexural strain and deformation was obtained. The higher the value, the higher the flexural strength of the test piece. Flexural Modulus: The test was conducted in accordance with ASTM D790 standard. The obtained value indicates the total energy that the test sample can withstand against flexural deformation. The larger the value, the higher the rigidity of the test sample. The unit is MPa. Heat Deflection Temperature (HDT): The test was conducted by applying a load of 1.82 MPa to the test piece in accordance with ASTM D648 standard. It is a parameter representing the relationship between heat and strain of the test sample and is an index for measuring the heat resistance of the polymer. During the test, a constant load is applied to the polymer, the temperature is raised at a constant speed, and the temperature corresponding to a predetermined strain is reached. Shrinkage Rate: Measured based on the ASTM D955 standard test method. "Shrinkage Rate" refers to the difference (percentage) between the dimensions of the plastic product cooled and solidified from the mold and the dimensions of the original mold.

[0041]

Table 1

[0042] As can be seen from Table 1, the PC-PET obtained by mixing the modified r-PET polyester particles and PC Alloy material has higher impact strength and higher heat deflection temperature (HDT). That is, the PCs of Example 1 and Example 2 - The Alloy material PET has better mechanical strength and thermal stability.

[0043] Table 2 provides the Alloy material PC-PET obtained by mixing PC with the second modified r-PET polyester particles or the third modified r-PET polyester particles of some embodiments of the present invention. The second modified r-PET polyester particles include modified r-PET polyester particles containing 86.5 wt% r-PET (IV is 0.8), 8 wt% compatibilizer (ethylene-methyl acrylate copolymer, E-MA), 2 wt% strengthening agent (POE), 1 wt% crystallization inhibitor (PET modified by 20% isophthalic acid copolymerization), 0.5 wt% lubricant (polyethylene wax), 1 wt% transesterification inhibitor (phosphite ester, for example, tris(2,4-di-tert-butylphenyl) phosphite), and 1 wt% antioxidant (blend-based antioxidant).

[0044] The third modified r-PET polyester particles include modified r-PET polyester particles containing 86.5 wt% r-PET (IV is 0.8), 8 wt% compatibilizer (POE-g-GMA), 2 wt% strengthening agent (POE), 1 wt% crystallization inhibitor (PET modified by 20% isophthalic acid copolymerization), 0.5 wt% lubricant (polyethylene wax), 1 wt% transesterification inhibitor (phosphite ester, tris(2,4-di-tert-butylphenyl) phosphite), and 1 wt% antioxidant (blend-based antioxidant).

[0045] [Table 2]

[0046] As can be seen from Table 2, the Alloy material PC-PET of Examples 5 and 6 has Alloy material higher impact strength and higher flexural strength than the Alloy material PC-PET of Examples 3 and 4. The third modified r-PET polyester particles are the Alloy materialIt can be seen that the impact resistance and flexural strength can be more effectively improved.

Industrial Applicability

[0047] The polycarbonate - polyethylene terephthalate of the present invention Alloy material is suitable for various processed products.

Claims

1. A polycarbonate and, a modified polyethylene terephthalate, and includes: The modified polyethylene terephthalate is 86.5 wt% of polyethylene terephthalate, 1 wt% of a transesterification inhibitor which is a phosphite-based transesterification inhibitor, 8 wt% of a compatibilizer which is an ethylene-methyl acrylate-glycidyl methacrylate copolymer, 2 wt% of a reinforcing agent which is a polyolefin elastomer, 1 wt% of a crystallization inhibitor which is polyethylene terephthalate modified by 20% isophthalic acid copolymerization, 0.5 wt% of a lubricant which is polyethylene wax, 1 wt% of an antioxidant which is a blend-based antioxidant, An alloy material of polycarbonate-polyethylene terephthalate containing these.

2. The alloy material of polycarbonate-polyethylene terephthalate according to Claim 1, wherein the alloy material of polycarbonate-polyethylene terephthalate contains 50 wt% of polycarbonate and 50 wt% of the modified polyethylene terephthalate.

3. The alloy material of polycarbonate-polyethylene terephthalate according to Claim 1, wherein the alloy material of polycarbonate-polyethylene terephthalate contains 35 wt% of polycarbonate and 65 wt% of the modified polyethylene terephthalate.

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