A polyethylene terephthalate mixture, its preparation method and use

Abstract

The present application discloses a kind of polyethylene terephthalate mixture and its preparation method and application, the polyethylene terephthalate mixture includes the following components: polyethylene terephthalate resin 45-86 parts by weight, toughening agent 0-10 parts by weight, reinforcing agent 10-50 parts by weight, nucleating agent 0.7-10 parts by weight, processing aid 0-3 parts by weight.The nucleating agent includes the combination of long-chain linear saturated lignosulfonate, talcum powder and polyethylene.The forming property of the polyethylene terephthalate mixture of the present application is further improved, the forming cycle is greatly shortened, the mechanical strength, toughness and heat distortion temperature can be maintained relatively high, the application range is further expanded, not limited by color, and can be applied to full-color products.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high molecular engineering plastic modification and forming processing, in particular to a polyethylene terephthalate mixture and a preparation method and application thereof. BACKGROUND

[0002] Polyethylene terephthalate (PET) has a chemical formula of (C 10 H8O4) n It is synthesized by dimethyl terephthalate and glycol ester exchange or by terephthalic acid and glycol esterification to first synthesize bis-hydroxyethyl terephthalate, and then perform polycondensation reaction. It is a semi-crystalline saturated polyester, a transparent polymer, and a commonly used resin in life.

[0003] Polyethylene terephthalate has good creep resistance, fatigue resistance, and dimensional stability, good electrical insulation performance, and is less affected by temperature. It is non-toxic, has good weather resistance, good chemical stability, low water absorption, and is resistant to weak acids and organic solvents. Therefore, it is commonly used in the fields of electronics and electrical equipment, construction and building, transportation, etc., such as motor and motor, coil framework, electrical management components, water treatment components, and automobile components.

[0004] It has been reported that a nano-layered silicate intercalated and grafted with a small molecule polymer is used as a nucleating agent and added to a PET reinforced material mixture to improve the crystallization ability of the PET material. However, the nano-layered silicate as a nucleating agent has limited improvement on the crystallization behavior of PET, and it tends to agglomerate in thermoplastic modified plastics, making it difficult to achieve good dispersion and leading to a decrease in the mechanical properties of the modified material.

[0005] It has also been reported that by adding 0.3-5wt% of expanded graphite and 1-5% of polyethylene glycol during the extrusion melting process, the melting crystallization temperature of the PET composite material is increased, the glass transition temperature and cold crystallization temperature are reduced, thereby achieving the purpose of increasing the crystallization rate and shortening the molding cycle. However, due to the color limitation of expanded graphite, this method is only suitable for dark products, and cannot be applied to light or bright products.

[0006] In addition, it has also been reported that a rapid forming reinforced thermoplastic polyester is used to increase the crystallization rate of PET by using zinc stearate or sodium benzoate in combination with ethylene glycol as a nucleating agent. However, the thermoplastic polyester obtained by this method has poor toughness, limiting its application range.

[0007] In summary, in the prior art, first, when inorganic minerals are selected as nucleating agents, the improvement of crystallization ability is very limited; when organic matters such as stearate or ethylene glycol are selected as nucleating agents, the degradation of PET resin is caused, the toughness of the material is poor, and the application range is limited; second, the crystallization speed in the cold crystallization region of the PET material is rarely considered to be improved. Therefore, it is necessary to develop a kind of PET reinforced material which can effectively improve the crystallization speed and shorten the molding cycle, and has high strength and toughness. SUMMARY

[0008] In view of the defects in the prior art, the present application provides a kind of polyethylene terephthalate mixture capable of rapid forming and its preparation method and application, the raw materials of the polyethylene terephthalate mixture include: polyethylene terephthalate resin, toughening agent, reinforcing agent, nucleating agent, processing aid.

[0009] The present application provides a kind of polyethylene terephthalate mixture, the mixture includes the following components:

[0010] Polyethylene terephthalate resin: 45-86 parts by weight;

[0011] Toughening agent: 0-10 parts by weight;

[0012] Reinforcing agent: 10-50 parts by weight;

[0013] Nucleating agent: 0.7-10 parts by weight;

[0014] Processing aid: 0-3 parts by weight;

[0015] The present application also provides a kind of polyethylene terephthalate mixture, the mixture includes the following components:

[0016] Polyethylene terephthalate resin: 45-80 parts by weight;

[0017] Toughening agent: 0-6 parts by weight;

[0018] Reinforcing agent: 15-50 parts by weight;

[0019] Nucleating agent: 1.4-7.5 parts by weight;

[0020] Processing aid: 0-3 parts by weight.

[0021] The relative density of the polyethylene terephthalate resin is 1.33-1.37, the melting point is 250-260℃, and the intrinsic viscosity is 0.6-1.1 dl / g, preferably 0.65-0.88 dl / g. The PET intrinsic viscosity test method is based on GB / T 14190-2017. The reason why the present application limits the intrinsic viscosity of the polyethylene terephthalate resin is that a suitable intrinsic viscosity helps to obtain better mechanical properties and good processing flowability. The polyethylene terephthalate resin can be a single resin with a specified intrinsic viscosity, or a mixed resin with a specified intrinsic viscosity obtained by blending two or more resins.

[0022] Further, the nucleating agent comprises a combination of long-chain linear saturated lignosulfonate, talc powder and polyethylene. The selection of a suitable nucleating agent is the key to the present application, and the use of polyethylene in combination with lignosulfonate and ultra-fine talc powder can significantly improve the formability of the polyethylene terephthalate mixture.

[0023] Further, the long-chain linear saturated lignosulfonate is 0.2-1.5 parts by weight; the talc powder is 0.2-2 parts by weight; and the polyethylene is 1-4 parts by weight.

[0024] Further, the long-chain linear saturated lignosulfonate is sodium lignosulfonate and / or calcium lignosulfonate; the talc powder is ultra-fine talc powder with a mesh size greater than 3000; and the polyethylene is at least one of high-density polyethylene, low-density polyethylene and linear low-density polyethylene. According to the improvement effect of the obtained polyethylene terephthalate mixture crystallization rate, the polyethylene with a crystallization temperature of 90-125℃ is preferred.

[0025] Further, the toughening agent is any one or more of a specific copolymer, a maleic anhydride reaction grafting product of the specific copolymer, a glycidyl methacrylate reaction grafting product of the specific copolymer, and a glycidyl methacrylate copolymerization product of the specific copolymer, the specific copolymer being any one of ethylene-octene copolymer (POE), ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer (EMA), and ethylene-butyl acrylate copolymer (EBA).

[0026] Further, the reinforcing agent is any one or two of glass fiber, carbon fiber, aluminum borate fiber, boron nitride fiber, potassium titanate fiber, alumina fiber, zirconia fiber, silicon nitride fiber, metal fiber, organic fiber. The reinforcing agent is not affected by the fiber form (such as raw silk, coarse sand, grinding), fiber diameter (7 microns, 10 microns, 13 microns, 17 microns, 25 microns), cross-sectional shape (circular, flat, irregular). According to the effect of the obtained mechanical properties, glass fiber and carbon fiber are preferred, and glass fiber is more preferred according to the cost performance.

[0027] Further, the processing aid is any one or more of antioxidant, lubricant, anti-hydrolysis aid, laser marking agent, weathering aid, coupling agent, antibacterial agent, anti-dripping agent, ester exchange inhibitor, colorant. The conventional antioxidant, lubricant, anti-hydrolysis aid, laser marking agent, weathering aid, coupling agent, antibacterial agent, anti-dripping agent, ester exchange inhibitor, colorant in the art can be used in the present application; without special requirements, antioxidant and lubricant are preferred.

[0028] The antioxidant is selected from any one or several of hindered phenolic antioxidant, phosphite antioxidant, diphenylamine antioxidant, copper salt antioxidant or sulfide antioxidant. The hindered phenolic antioxidant can be selected from any one or several of 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, tetra[β(3.5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, diethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propyl methyl ester] or β-(3,5-di-tert-butyl-4-hydroxyphenyl)propyl octadecyl ester; the phosphite antioxidant can be selected from any one or several of tris(2,4-di-tert-butylphenyl) phosphite or bis(2,4-di-cumylphenyl) pentaerythritol diphosphite; the diphenylamine antioxidant can be selected from 4,4'-bis(α,α'-dimethylbenzyl) diphenylamine; the copper salt antioxidant can be selected from a mixture of 8:1:1 K / Cu / Zn BLEND or KI / CuI; the sulfide antioxidant can be selected from any one or several of pentaerythritol tetra(3-laurylthiopropionate) or dioctadecyl thiodipropionate.

[0029] The lubricant can be one or a mixture of two of an ester lubricant, a polyethylene wax lubricant, a silicone lubricant, an amide lubricant, a montan ester lubricant. The ester lubricant can be pentaerythritol tetrastearate (PETS); the polyethylene wax lubricant can be an oxidized polyethylene wax, an ethylene-acrylic acid copolymer wax; the silicone lubricant can be silicone or silicone masterbatch; the amide lubricant can be aliphatic amide TAF; and the montan ester lubricant can be esterified wax TR044W.

[0030] The application also provides a preparation method of the polyethylene terephthalate mixture, comprising the following steps: uniformly mixing raw materials of the polyethylene terephthalate mixture according to weight parts, and then adding the mixture into a double-screw extruder, wherein the reinforcing agent is added at a position with openings between the third zone and the seventh zone of the double-screw extruder according to the mechanical property effect of the obtained material; the temperature of the first zone of the double-screw extruder is 30-200 DEG C, the temperature of the second zone is 240-280 DEG C, the temperature of the third zone is 240-280 DEG C, the temperature of the fourth zone is 230-270 DEG C, the temperature of the fifth zone is 220-260 DEG C, the temperature of the sixth zone is 210-250 DEG C, the temperature of the seventh zone is 210-250 DEG C, the temperature of the eighth zone is 210-250 DEG C, the temperature of the ninth zone is 210-250 DEG C, the temperature of the die head is 220-260 DEG C, the residence time is 1-3 minutes, and the rotation speed of the main machine is 300-500 rpm; and after extrusion, the mixture is cooled, cut into particles, and dried.

[0031] The application also provides application of the polyethylene terephthalate mixture in preparation of electronic and electrical equipment, water treatment components, and automobile parts.

[0032] In summary, compared with the prior art, the application achieves the following technical effects:

[0033] 1. The polyethylene terephthalate mixture has the characteristics of rapid forming, high mechanical strength, and good toughness.

[0034] 2. The forming property of the polyethylene terephthalate mixture is further improved, the crystallization speed is increased, the forming cycle is greatly shortened, and the application range is further expanded.

[0035] 3. The polyethylene terephthalate mixture can maintain high mechanical strength, toughness, and heat distortion temperature, and the application range is expanded.

[0036] 4. The polyethylene terephthalate mixture does not add colored substances, and thus is not limited by color, and can be applied to full-color products. DETAILED DESCRIPTION

[0037] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative work should belong to the protection scope of the present application.

[0038] The polyethylene terephthalate mixture of the present application comprises the following components:

[0039] Polyethylene terephthalate resin: 45-86 parts by weight;

[0040] Toughening agent: 0-10 parts by weight;

[0041] Reinforcing agent: 10-50 parts by weight;

[0042] Nucleating agent: 0.7-10 parts by weight;

[0043] Processing aid: 0-3 parts by weight;

[0044] The polyethylene terephthalate mixture of the present application, the mixture of the further preferred aspect comprises the following components:

[0045] Polyethylene terephthalate resin: 45-80 parts by weight;

[0046] Toughening agent: 0-6 parts by weight;

[0047] Reinforcing agent: 15-50 parts by weight;

[0048] Nucleating agent: 1.4-7.5 parts by weight;

[0049] Processing aid: 0-3 parts by weight.

[0050] The polyethylene terephthalate resin has a relative density of 1.33-1.37, a melting point of 250-260℃, an intrinsic viscosity of 0.6-1.1 dl / g, and preferably an intrinsic viscosity of 0.65-0.88 dl / g. The present application limits the intrinsic viscosity of the polyethylene terephthalate resin because a suitable intrinsic viscosity is helpful to obtain better mechanical properties and good processing flowability. The polyethylene terephthalate resin can be a single resin having a specified intrinsic viscosity, or a mixed resin having a specified intrinsic viscosity obtained by blending two or more resins. For example, a PET resin having an intrinsic viscosity of 0.80 dl / g is obtained by mixing a PET resin having an intrinsic viscosity of 1.05 dl / g and a PET resin having an intrinsic viscosity of 0.67 dl / g.

[0051] The toughening agent is ethylene-octene copolymer (POE), ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer (EMA), ethylene-butyl acrylate copolymer (EBA), and any one or a mixture of two or more of maleic anhydride reaction grafting products, glycidyl methacrylate reaction grafting products, and glycidyl methacrylate copolymerization products, but is not limited to these.

[0052] The reinforcing agent is a fibrous filler. It can be one or a mixture of two of glass fiber and glass fiber powder, carbon fiber, aluminum borate fiber, boron nitride fiber, potassium titanate fiber, alumina fiber, zirconia fiber, silicon nitride fiber, metal fiber, and organic fiber. The reinforcing agent is not affected by the fiber form (e.g., raw silk, coarse sand, grinding), fiber diameter (7 microns, 10 microns, 13 microns, 17 microns, 25 microns), and cross-sectional shape (circular, flat, irregular). According to the effect of the obtained mechanical properties, glass fiber and carbon fiber are preferred, and glass fiber is more preferred in terms of cost performance.

[0053] The nucleating agent includes a combination of long-chain linear saturated lignosulfonate, talc powder, and polyethylene. The long-chain linear saturated lignosulfonate is 0.2-1.5 parts by weight; the talc powder is 0.2-2 parts by weight; and the polyethylene is 1-4 parts by weight. Selecting a suitable nucleating agent is the key to the present application. The use of polyethylene in combination with lignosulfonate and ultra-fine talc powder can significantly improve the moldability of the polyethylene terephthalate mixture, and the combination of polyethylene with lignosulfonate and ultra-fine talc powder has a synergistic effect on improving the moldability of the polyethylene terephthalate mixture.

[0054] The nucleating agent, wherein the long-chain linear saturated lignosulfonate is preferably sodium lignosulfonate and / or calcium lignosulfonate.

[0055] The nucleating agent, wherein the talc powder is preferably ultra-fine talc powder with a mesh size of >3000.

[0056] The nucleating agent, wherein the polyethylene can be at least one of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE). According to the effect of improving the crystallization rate of the terephthalate mixture obtained, polyethylene with a crystallization temperature of 90-125°C is preferred.

[0057] The processing aid is added according to the final functional requirements of the material, and is any one or a combination of two or more of an antioxidant, a lubricant, a hydrolysis-resistant aid, a laser marking agent, a weather-resistant aid, a coupling agent, an antibacterial agent, an anti-dripping agent, an ester exchange inhibitor, and a colorant. In the absence of special requirements, an antioxidant and a lubricant are preferred.

[0058] The present application also provides a method for preparing the polyethylene terephthalate mixture. The raw materials of the polyethylene terephthalate mixture are uniformly mixed by weight parts and then added into a twin-screw extruder. The mixture can be added into the twin-screw extruder at the opening between the first zone and the sixth zone according to the mechanical properties of the obtained material. The reinforcing agent is added into the twin-screw extruder at the opening between the third zone and the seventh zone. The temperature of the first zone of the twin-screw extruder is 30-200°C, the temperature of the second zone is 240-280°C, the temperature of the third zone is 240-280°C, the temperature of the fourth zone is 230-270°C, the temperature of the fifth zone is 220-260°C, the temperature of the sixth zone is 210-250°C, the temperature of the seventh zone is 210-250°C, the temperature of the eighth zone is 210-250°C, the temperature of the ninth zone is 210-250°C, the temperature of the die head is 220-260°C, the residence time is 1-3 minutes, and the rotation speed of the main machine is 300-500 rpm. After extrusion, cooling, granulation, and drying are performed.

[0059] (1) Raw material sources

[0060] PET resin 1: polyethylene terephthalate resin, model PET BG80, relative density 1.34, intrinsic viscosity 0.80 dl / g, purchased from Sinopec Group Assets Management Co., Ltd. Yizheng Branch;

[0061] PET resin 2: polyethylene terephthalate resin, model PET SY-G105, relative density 1.34, intrinsic viscosity 1.09 dl / g, purchased from Wujiang Shuangyang Polyester Modification Factory;

[0062] PET resin 3: polyethylene terephthalate resin, model PET CR-7702, relative density 1.31, intrinsic viscosity 0.50, purchased from Huaru Packaging Material Co., Ltd.;

[0063] Toughening agent 1: ethylene-butyl acrylate-glycidyl methacrylate terpolymer, model Elvaloy resins PTW, purchased from DuPont China Group Co., Ltd. Shanghai Branch;

[0064] Toughening agent 2: ethylene-methyl acrylate, model Elvaloy AC resin 1125, purchased from DuPont China Group Co., Ltd. Shanghai Branch;

[0065] Reinforcing agent: alkali-free short-cut glass fiber, model ECS11-4.5-534A, purchased from Jushi Group Co., Ltd.;

[0066] Nucleating agent A1: superfine talc powder, model HTPULtra5L, 5000 mesh, purchased from Liaoning Aihaimi Mining Co., Ltd.;

[0067] Nucleating agent A2, talc, model TY90-13-A, 1250 mesh, purchased from Guilin Longwei New Material Science and Technology Co., Ltd.

[0068] Nucleating agent B1, sodium humate, model LICOMONT NAV101 PWD, purchased from Clariant (China) Co., Ltd.

[0069] Nucleating agent B2, calcium humate, model LICOMONT CAV102 PWD, purchased from Clariant (China) Co., Ltd.

[0070] Nucleating agent C1, low-density polyethylene, model LDPE 2426H, purchased from PetroChina Lanzhou Petrochemical Company

[0071] Nucleating agent C2, high-density polyethylene, model HDPE 5000S, purchased from PetroChina South China Chemical Sales Branch

[0072] Antioxidant 1, β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, model RIANOX 1076, purchased from Tianjin Li'anlong New Material Science and Technology Co., Ltd.

[0073] Antioxidant 2, tris(2,4-di-tert-butylphenyl) phosphite, model antioxidant Y-002, purchased from Yingkou Fengguang Chemical Co., Ltd.

[0074] Lubricant 1, silicone master batch, model MB50-002, silicone content 50%, carrier PE resin, purchased from Dow Corning (Shanghai) Co., Ltd.

[0075] Lubricant 2, lignin wax, model LICOWAX E, purchased from Clariant (China) Co., Ltd.

[0076] Silicate, 30% epoxy compound grafted nanometer layered silicate, model WP-830 (customized), purchased from Jiangxi Wei'p Technology Co., Ltd.

[0077] Examples

[0078] The polyethylene terephthalate (PET) was prepared according to the preparation method provided in the present application by using the weight parts of each component in Table 1.

[0079] Components (weight parts) of the examples in Table 1

[0080]

[0081]

[0082]

[0083] The tensile strength (MPa), notched Izod impact strength (kJ / m 2 ), heat distortion temperature (°C) and molding cycle (s) of the obtained polyethylene terephthalate (PET) were measured, and the moldability was observed.

[0084] The performance test methods are as follows:

[0085] (1) Tensile strength: tested according to standard ISO 527-2-2012, sample size 150*10*4mm, tensile speed 10mm / min;

[0086] (2) Notched Izod impact strength: tested according to standard ISO 180-2001, sample size 80*10*4mm, notch depth 2mm;

[0087] (3) Heat distortion temperature: tested according to standard ISO 75-2-2013, sample size 80*10*4mm, load 1.80MPa, sample flat;

[0088] (4) Moldability: the molding difficulty was determined by appearance. Normal: no needle mark, no deformation.

[0089] (5) Molding cycle: in the continuous production process, the shortest molding time from the start of the mold of the last mold to the start of the mold of the next mold under the premise that the sample can be completely demolded.

[0090] The test results are shown in Table 2:

[0091] Table 2 Test results of examples

[0092]

[0093]

[0094] The above results show that the thermal deformation temperatures of Examples 1-19 are high, the molding cycle is short, and the moldability is good. Among them, the polyethylene in the nucleating agent, whether high-density polyethylene or low-density polyethylene, can achieve the purpose of the present application; the long-chain linear saturated lignosulfonate, whether sodium lignosulfonate or calcium lignosulfonate, can also achieve the purpose of the present application. The molding cycle of Example 6 is shorter and the tensile strength is higher than that of Example 8, indicating that the preferred 0-6 parts by weight of toughening agent is more effective in improving moldability and shortening the molding cycle. The tensile strength and impact strength of Example 6 are higher than those of Example 13, the molding cycle, tensile strength, and impact strength of Example 6 are higher than those of Example 11, and the thermal deformation temperature is high, indicating that the preferred 1.4-7.5 parts by weight of nucleating agent is more effective in obtaining the best mechanical properties, improving moldability, and shortening the molding cycle. Example 17 uses PET resin 2 with a specific viscosity of 1.09 dl / g to replace PET resin 1 of Example 6, and Example 18 uses PET resin 3 with a specific viscosity of 0.50 dl / g to replace PET resin 1 of Example 6. The thermal deformation temperature of Example 6 is higher and the molding cycle is shorter than that of Example 17, indicating that the preferred 0.65-0.88 dl / g specific viscosity of PET resin is more effective in improving heat resistance and shortening the molding cycle. The thermal deformation temperature of Example 17 is higher and the molding cycle is shorter than that of Example 18, indicating that the 0.6-1.1 dl / g specific viscosity of PET resin is more effective in improving heat resistance and shortening the molding cycle. Example 19 uses 1250 mesh talc to replace 5000 mesh talc in Example 6, and the thermal deformation temperature of Example 6 is higher, the molding cycle is shorter, and the mechanical properties are better than those of Example 19, indicating that the use of talc with a mesh size of 3000 or more is more effective.

[0095] Comparative Example

[0096] The polyethylene terephthalate (PET) was prepared according to the preparation method provided in the present application with the weight parts of each component in Table 3.

[0097] Table 3 Components (weight parts) of the comparative example

[0098]

[0099]

[0100] The tensile strength (MPa), Izod notched impact strength (kJ / m 2 ), thermal deformation temperature (°C), and molding cycle (s) of the prepared polyethylene terephthalate (PET) were measured, and the moldability was observed. The test results are shown in Table 4.

[0101] Table 4 Test results of the comparative example

[0102] Test item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Tensile strength (MPa) 155 159 153 134 Izod notched impact strength (kJ / m 2 ) 11.2 13.5 11.1 9.7 Heat distortion temperature (°C) 96.2 189.6 98.7 167.8 Moldability Deformation Pin mark Deformation Deformation Mold cycle (s) 48 28 46 35

[0103] In Table 3, Comparative Examples 1-3 are compared with Example 6 in Table 1; Comparative Example 4 is an example in the prior art using silicate as a nucleating agent, which is compared with Example 16 in Table 1.

[0104] From the results in Table 4, it can be found that Comparative Example 1 does not add a nucleating agent, and the mechanical properties are low, and due to the low crystallization speed, the heat distortion temperature is low, the molding cycle is long, and the product is deformed; Comparative Example 2 adds nucleating agent A and nucleating agent B, and the heat distortion temperature is significantly improved, the molding cycle is shortened, but the moldability is still poor, and there is a problem of white pin marks; Comparative Example 3 adds nucleating agent C, and the mechanical behavior, heat distortion temperature, and moldability are similar to those of Comparative Example 1. Compared with Comparative Examples 1-3, Example 6 simultaneously adds nucleating agent A, nucleating agent B, and nucleating agent C, and the mechanical properties and heat distortion temperature are significantly improved, the moldability is significantly improved, the molding cycle is greatly shortened, which proves that the polyethylene used together with lignosulfonate and ultra-fine talc has a synergistic effect on improving the crystallization behavior of the polyethylene terephthalate modified material. The mechanical properties of Comparative Example 4, which is an example in the prior art using silicate as a nucleating agent, are low; compared with Comparative Example 4, the mechanical properties and heat distortion temperature of Example 16 are greatly improved, the molding cycle is shortened, and the moldability is effectively improved.

[0105] In summary of the above examples and comparative examples, the present application discloses a polyethylene terephthalate mixture, a preparation method and application thereof, the polyethylene terephthalate mixture comprises the following components: 45-86 parts by weight of polyethylene terephthalate resin, 0-10 parts by weight of toughening agent, 10-50 parts by weight of reinforcing agent, 0.7-10 parts by weight of nucleating agent, and 0-3 parts by weight of processing aid. The nucleating agent comprises a combination of long-chain linear saturated lignosulfonate, talc, and polyethylene. The use of polyethylene together with lignosulfonate and ultra-fine talc can significantly improve the moldability of the polyethylene terephthalate mixture, greatly improve the mechanical properties and heat distortion temperature, and shorten the molding cycle. The use of polyethylene together with lignosulfonate and ultra-fine talc has a synergistic effect on improving the moldability of the polyethylene terephthalate mixture. In the present application, no colored substances are added, and the application range is further expanded without color restrictions, and full-color product applications can be faced.

[0106] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A polyethylene terephthalate mixture, characterized in that, The mixture comprises the following components: Polyethylene terephthalate resin: 45-80 parts by weight; Toughening agent: 0-6 parts by weight; Reinforcing agent: 15-50 parts by weight; Nucleating agent: 1.4-7.5 parts by weight; Processing aid: 0-3 parts by weight; The nucleating agent comprises a combination of long-chain linear saturated lignosulfonate, talc powder and polyethylene; The talc powder is super-fine talc powder of 5000 mesh; The polyethylene is polyethylene with a crystallization temperature of 90-125℃; The long-chain linear saturated lignosulfonate is 0.2-1.5 parts by weight; the talc powder is 0.2-2 parts by weight; and the polyethylene is 1-4 parts by weight; The processing aid is any one or more of antioxidants, lubricants, hydrolysis-resistant aids, laser marking agents, weather-resistant aids, coupling agents, antibacterial agents, anti-dripping agents, ester exchange inhibitors, and colorants.

2. The polyethylene terephthalate mixture according to claim 1, characterized in that, The polyethylene terephthalate resin has an intrinsic viscosity of 0.6-1.1 dl / g.

3. The polyethylene terephthalate mixture according to claim 2, characterized in that, The polyethylene terephthalate resin has an intrinsic viscosity of 0.65-0.88 dl / g.

4. The polyethylene terephthalate mixture of claim 1, wherein, The long-chain linear saturated lignosulfonate is sodium lignosulfonate and / or calcium lignosulfonate; and the polyethylene is at least one of high-density polyethylene, low-density polyethylene and linear low-density polyethylene.

5. The polyethylene terephthalate mixture of claim 1, wherein, The toughening agent is any one or more of a specific copolymer, a maleic anhydride reaction graft product of the specific copolymer, a glycidyl methacrylate reaction graft product of the specific copolymer, and a glycidyl methacrylate copolymerization product of the specific copolymer, the specific copolymer being any one of ethylene-octene copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and ethylene-butyl acrylate copolymer.

6. The polyethylene terephthalate mixture of claim 1, wherein, The reinforcing agent is any one or two of glass fiber, carbon fiber, aluminum borate fiber, boron nitride fiber, potassium titanate fiber, alumina fiber, zirconia fiber, silicon nitride fiber, metal fiber and organic fiber.

7. Process for the production of a polyethylene terephthalate mixture according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: The raw materials of the polyethylene terephthalate mixture are uniformly mixed in parts by weight, and then added to a twin-screw extruder. The mixture is added to the twin-screw extruder at openings between the first zone and the sixth zone, according to the mechanical properties of the obtained material. The reinforcing agent is added to the twin-screw extruder at openings between the third zone and the seventh zone. The temperature of the first zone of the twin-screw extruder is 30-200℃, the temperature of the second zone is 240-280℃, the temperature of the third zone is 240-280℃, the temperature of the fourth zone is 230-270℃, the temperature of the fifth zone is 220-260℃, the temperature of the sixth zone is 210-250℃, the temperature of the seventh zone is 210-250℃, the temperature of the eighth zone is 210-250℃, the temperature of the ninth zone is 210-250℃, the temperature of the die is 220-260℃, the residence time is 1-3 minutes, and the rotation speed of the main machine is 300-500 rpm. After extrusion, the material is cooled, cut and dried.

8. Use of the polyethylene terephthalate mixture of any one of claims 1-6 in the preparation of electronic and electrical equipment, building and construction, and automobile parts.

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