Pet composite material having high temperature resistance and preparation method therefor

Abstract

Disclosed in the present invention are a PET composite material having high temperature resistance and a preparation method therefor. The PET composite material having high temperature resistance comprises the following substances in parts by weight: 90.6-96.4% of PET, 1-4% of an impact modifier, 0.1-0.4% of a nucleating agent, 0.8-2% of a nucleation accelerator, and 0.5-2% of an adhesion promoter. The impact modifier has an ethylene content of 85-95%, and a functional group grafting rate is 1.5-4%. The PET composite material is prepared by the following method: (1) weighing the components according to a certain ratio, mixing uniformly, and stirring for 5 minutes using a stirrer; (2) putting same in a TSE-95 twin-screw granulator, wherein the granulation temperature is 250-280°C, and the screw rotation speed is 300-500 r / min; and granulating to obtain a final product. The PET composite material having high temperature resistance prepared in this application has both high temperature resistance and good mechanical properties; energy consumption is reduced, and the processing cycle is greatly shortened.

Description

PET composite material with high temperature resistance and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the field of high polymer materials, in particular to a PET composite material with high temperature resistance and a preparation method thereof. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and can not constitute the prior art.

[0003] High temperature resistant PET refers to a high temperature resistant material that can withstand heating in an oven or other heater at 140-190 DEG C and remain unchanged after 3-10 minutes. The material can be widely used in small household appliances, cosmetics, food and beverage packaging and other fields, and belongs to the recycling field, with the characteristics of green and low carbon. The common implementation ways of high temperature resistant PET are as follows: first, different contents of glass fiber are compounded, and toughening agent, nucleating agent, talc, antioxidant are added to prepare. This method can obtain PET composite material with high temperature resistance, high strength and low mold shrinkage. For example, patent CN201410452603 PET glass fiber reinforced modified material. In the patent, glass fiber is the key to change the performance of PET, and the length and surface treatment of glass fiber. The limitation is that when applied in the fields of cosmetics, food and beverage, the environmental protection performance is not enough, and the food hygiene certification cannot be passed. In addition, it is not conducive to multiple recycling. Second: using double screw modification and granulation technology, adding flow modifier, nucleating agent, antioxidant, toughening agent, dispersing agent, nucleating promoter, inorganic filler in PET. When injection molding, the cold\hot crystallization rate of PET is accelerated, the crystallinity of injection molded product is improved, and the temperature resistance is improved. For example, patent: a high temperature resistant injection molding grade super tough PET. The patent uses part of inorganic filling, and the disadvantage is that when injection molding high smoothness product, the filling will cause precipitation, and the product surface will appear frosted effect. In addition, the toughening agent and the like are not compatible with PET after treatment, and there is a risk of precipitation in subsequent high and low temperature use of the product. Low molecular weight liquid additives cause PET degradation, yellowing and brittleness. The first two technologies need high mold temperature, which increases the possibility of product crystallization defects and energy consumption. SUMMARY

[0004] The present application aims at the problems of complex preparation method of high temperature resistant PET and poor product performance, and provides a PET composite material with high temperature resistance and a preparation method thereof. The prepared product has high temperature resistance and good mechanical properties.

[0005] The technical scheme of the present application is as follows:

[0006] A PET composite material with high temperature resistance comprises the following substances in parts by weight: PET 90.6-96.4%, impact modifier 1-4%, nucleating agent 0.1-0.4%, nucleating promoter 0.8-2%, and adhesion promoter 0.5-2%.

[0007] The impact modifier is a polyethylene acrylate grafted epoxy substance, wherein the ethylene content is 85-95%, and the functional group grafting rate is 1.5-4%; the impact modifier has a specific melting point (88-92℃) and is grafted with a high-activity functional group capable of reacting with PET, and can be uniformly dispersed in PET, thereby greatly improving the toughening effect at a low content.

[0008] Preferably, the PET composite material with high temperature resistance comprises the following substances in parts by weight: PET 94.7-96.4%, impact modifier 1.5-3%, nucleating agent 0.2-0.4%, nucleating promoter 1.2-2%, and adhesion promoter 0.5-2%.

[0009] Preferably, the functional group grafting rate is preferably 2-4%, so that the PET has a certain micro-linking effect, but does not affect the PET molecular chain movement, thereby having little effect on the crystallization speed.

[0010] The lower the ethylene content in the impact modifier, the higher the toughness of the prepared material; the higher the ethylene content, the lower the toughness of the prepared material. However, a low ethylene content improves the toughness while reducing the remaining performance of the material, such as insufficient material rigidity, which poses a risk of deformation for load-bearing parts. At the same time, it reduces the softening point of the impact modifier, which easily softens and agglomerates during batching, resulting in uneven stirring. The grafted functional group is, for example, GMA. The grafted functional group reacts with PET to promote the stability of the melt strength and improve the polarity of the PET functional group.

[0011] The viscosity of the PET is 0.8-1.2; selecting a suitable PET viscosity ensures that it has a certain amount of -COOH after granulation, which can quickly crystallize, but its mechanical properties remain good.

[0012] The nucleation promoter is a high-temperature resistant ester plasticizer, which can play a toughening effect and meet the food hygiene certification, and the prepared product can be applied to food packaging. The nucleation promoter has very high temperature resistance and will not decompose even if the injection molding temperature is higher than 300 DEG C in the field of cosmetics. Meanwhile, the promoter has the ability of dispersion, demolding and improving compatibility. Further increase the dispersibility of the composite. The nucleation promoter is, for example, a hydroxyl-terminated hyperbranched polyester: epoxy resin with a molecular weight of 600-800.

[0013] The adhesion promoter is an acid anhydride, epoxy, furan aid.

[0014] The adhesion promoter improves the adhesion of the PET surface, increases the compatibility of the nucleating agent with PET, and avoids the problem of insufficient adhesion of the material prepared by the prior art in the subsequent processing of electroplating and spraying. Compared with the method of spraying the treatment agent on the surface of the product, the toughness of the material is not deteriorated.

[0015] The adhesion promoter is, for example, EAA (ethylene acrylic acid copolymer) grafted MAH (maleic anhydride), TPEE (polyester rubber), low molecular epoxy, low molecular maleic anhydride or EAA promoter.

[0016] The nucleating agent is a potassium / sodium salt complex of N-butyl piperazine.

[0017] The nucleating agent can promote the crystallization rate of PET from high temperature cooling and from low temperature heating to the glass transition temperature (Tg) around the crystallization rate. The increase of the thermal crystallization rate reduces the cold crystallization temperature, so that the crystallization is faster and more complete. The nucleating agent reacts with the end group of PET molecule during the use and processing process, reacts with the polar group on the end of PET molecular chain to form a homogeneous nucleation point of PET, which is easy to form a certain size of thermodynamic stable crystal nucleus at a higher temperature, so that the subsequent crystal nucleus growth is rapidly carried out, and the crystallization induction period is greatly shortened. On the other hand, unlike the nucleating agent of the prior art, it will not cause the breakage and degradation of PET molecular chain, and will not break the molecular chain due to the efficient formation of crystallization point, and will accelerate the crystallization by the accelerator to promote the crystallization of the whole system. The two aspects together greatly improve the crystallization rate of PET. The present application utilizes the characteristics of high-efficiency nucleation, adopts high viscosity chip to avoid the degradation of PET and further obtains the rapid crystallization ability of PET.

[0018] The composition used in the present application has a 5% weight loss temperature above 400 DEG C except the nucleating agent, which meets the food hygiene requirements, avoids the degradation and harmful substances generated by high temperature processing of PET, and affects the health of consumers. The nucleating agent has FDA certification and will not affect food safety.

[0019] Preferably, the PET composite material with high temperature resistance of the application further comprises 0.3-0.5% of surface anti-scratch agent, which improves the wear resistance of the product.

[0020] A preparation method of a PET composite material with high temperature resistance, comprising the following steps:

[0021] (1) The components are weighed according to the above-mentioned ratio and mixed uniformly, and the stirrer is stirred for 5 minutes;

[0022] (2) Enter the TSE-95 double screw granulator to granulate to obtain the final product.

[0023] Preferably, in step (2), the granulation temperature is 250-280°C, and the screw rotation speed is 300-500 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, and the injection molding temperature is 265-275°C, and the mold temperature is 35-55°C.

[0024] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0025] Compared with the prior art, the application has the following advantages:

[0026] 1. A PET composite material with high temperature resistance, which reduces industry carbon emissions and is applied to the fields of household appliances, cosmetics, food and beverages, etc., and is green and environmentally friendly and meets the standards of Europe and the United States.

[0027] 2. A PET composite material with high temperature resistance, which enhances the adhesion of the PET material in the above-mentioned application fields through a surface adhesion promoter, and solves the problems of performance degradation and pollution caused by the large use of solvents.

[0028] 3. A PET composite material with high temperature resistance, which has a grafting rate range and a melting point selection of an impact modifier, and a nucleation promoter with demolding effect; the composite material reduces industry carbon emissions and is applied to the fields of household appliances, cosmetics, food and beverages, etc., and is green and environmentally friendly and meets the standards of Europe and the United States; the surface adhesion promoter enhances the adhesion of the PET material in the above-mentioned application fields, and solves the problems of performance degradation and pollution caused by the large use of solvents.

[0029] 4. The composite material obtained by the application has a thermal crystallization peak temperature that is about 28°C higher than that of pure PET, and a low-temperature crystallization peak temperature that is about 20°C lower than that of pure PET.

[0030] 5. The eyebrow pencil and the lunch box made of the composite material obtained by the application can be baked in a 160°C oven for 5 minutes without deformation.

[0031] 6、The material of the application meets FDA food hygiene certification and California Document No. 96 Product Related Certification, and does not use the technical route of adding a large amount of inorganic fillers or glass fibers or other high-temperature-resistant resins, and realizes high-temperature resistance on the basis of regulating the structure of impact modifiers and functionalizing flow modifiers.

[0032] 7、The composite material of the application has the characteristics of reducing carbon emissions and being recyclable.

[0033] 8、The composite material obtained in the application can realize high-temperature resistance without high mold temperature, energy consumption is reduced, and the processing cycle is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a DSC graph of the pure PET material used in the application;

[0035] Figure 2 is a DSC graph of the PET composite material with high temperature resistance prepared in the application. Embodiment of the application

[0036] It should be noted that the test methods in the following examples are conventional methods unless otherwise specified. The test materials used in the following examples are commercially available. In the quantitative test in the following examples, three repeated tests are set, and the average value is taken as the result.

[0037] The characteristics and properties of the application will be further described in detail below in combination with examples.

[0038] Example 1

[0039] This embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0040] (1) The impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 1.5%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating agent (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, and PET 94.7% (viscosity 0.92) are weighed according to the following ratio and mixed uniformly, and stirred for 5 minutes by a stirrer;

[0041] (2) Enter the TSE-95 double screw granulator, and granulate the final product.

[0042] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; After granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0043] Example 2

[0044] The embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method.

[0045] (1) The anti-impact modifier (polyethylene acrylate grafting GMA) 3% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7% and PET 94.7% (viscosity 0.92) are weighed according to the following ratio and uniformly mixed, and stirred for 5 minutes by a stirrer;

[0046] (2) The mixture is put into a TSE-95 double-screw granulator, and the final product is prepared.

[0047] Preferably, in step (2), the granulation temperature is 265 DEG C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, the injection molding temperature is 268 DEG C, and the mold temperature is 50 DEG C.

[0048] Example 3

[0049] The embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method.

[0050] (1) The anti-impact modifier (polyethylene acrylate grafting GMA) 3% (ethylene content 92%, functional group grafting rate 4%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7% and PET 94.7% (viscosity 0.92) are weighed according to the following ratio and uniformly mixed, and stirred for 5 minutes by a stirrer;

[0051] (2) The mixture is put into a TSE-95 double-screw granulator, and the final product is prepared.

[0052] Preferably, in step (2), the granulation temperature is 265 DEG C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, the injection molding temperature is 268 DEG C, and the mold temperature is 50 DEG C.

[0053] Example 4

[0054] The embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method.

[0055] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 85%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7%, PET 94.7% (viscosity 0.92) according to the following ratio, mix evenly, stir for 5 minutes;

[0056] (2) Enter the TSE-95 double screw granulator, and the final product is granulated.

[0057] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0058] Example 5

[0059] This embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0060] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 95%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7%, PET 94.7% (viscosity 0.92) according to the following ratio, mix evenly, stir for 5 minutes;

[0061] (2) Enter the TSE-95 double screw granulator, and the final product is granulated.

[0062] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips prepared by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0063] Example 6

[0064] This embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0065] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7%, PET 94.7% (viscosity 0.8) according to the following ratio, mix evenly, stir for 5 minutes;

[0066] (2) into TSE-95 double screw granulator, granulation of the final product.

[0067] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0068] Example 7

[0069] This example provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0070] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating agent (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, and PET 94.7% (viscosity 1.2) according to the following ratio, mix evenly, and stir for 5 minutes with a stirrer;

[0071] (2) into TSE-95 double screw granulator, granulation of the final product.

[0072] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0073] Example 8

[0074] This example provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0075] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating agent (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, and PET 94.7% (viscosity 0.92) according to the following ratio, mix evenly, and stir for 5 minutes with a stirrer;

[0076] (2) into TSE-95 double screw granulator, granulation of the final product.

[0077] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0078] Example 9

[0079] The present example provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0080] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7%, PET 94.7% (viscosity 0.92) according to the following ratio, mix evenly, and stir for 5 minutes with a stirrer;

[0081] (2) Enter the TSE-95 double screw granulator, and granulate the final product.

[0082] Preferably, in step (2), the granulation temperature is 278°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test bars prepared by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0083] Example 10

[0084] The present example provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0085] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion accelerator (TPEE) 0.7%, PET 94.7% (viscosity 0.92) according to the following ratio, mix evenly, and stir for 5 minutes with a stirrer;

[0086] (2) Enter the TSE-95 double screw granulator, and granulate the final product.

[0087] Preferably, in step (2), the granulation temperature is 278°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test bars prepared by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0088] Example 11

[0089] The present example provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0090] (1) Take the impact modifier (polyethylene acrylate graft GMA) 3% (ethylene content 92%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleation accelerator (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, PET 94.7% (viscosity 0.92) according to the following ratio, mix well, stir for 5 minutes;

[0091] (2) Enter the TSE-95 double screw granulator, and granulate the final product.

[0092] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 500 r / min; after granulation, the particles are tested for mechanical properties and temperature resistance by injection molding, and the injection molding temperature is 268°C and the mold temperature is 50°C.

[0093] The test data of examples 1-11 are as follows:

[0094] Impact strength heat distortion temperature (0.455mpa test) tensile strength elongation bending strength bending modulus 12.1 KJ / m2 299°C 80mpa 92% 82mpa 3679mpa 23.8 KJ / m2 105°C 83mpa 90% 86mpa 3979mpa 31.9 KJ / m2 103°C 86mpa 70% 88mpa 4001mpa 45.1 KJ / m2 283°C 69mpa 180% 72mpa 2531mpa 51.5 KJ / m2 101°C 87mpa 43% 81mpa 3479mpa 61.9 KJ / m2 103°C 87mpa 45% 87mpa 3955mpa 72.3 KJ / m2 106°C 85mpa 82% 88mpa 3755mpa 82.3 KJ / m2 292°C 87mpa 89% 81mpa 3664mpa 91.3 KJ / m2 297°C 80mpa 57% 83mpa 3544mpa 102.4 KJ / m2 102°C 80mpa 74% 81mpa 3316mpa 111.9 KJ / m2 103°C 83mpa 79% 84mpa 3785mpa

[0095] As can be seen from the above table, the performance of the PET composite material prepared in example 2 is the best, the impact strength is high, the heat distortion temperature is high, the tensile strength, elongation and bending strength, bending modulus are relatively good, and the comprehensive performance is good.

[0096] As can be seen from the test data of comparative examples 1-3, when the functional group grafting rate in the impact modifier is changed, the comprehensive performance of the material changes obviously, and the functional group grafting rate of example 2 is the best in comprehensive performance;

[0097] From Comparative Examples 2, 4, 6, it can be seen that when the ethylene content in the impact modifier is changed, the overall performance of the material changes to a large extent. In Example 4, when the ethylene content in the material is lower, the impact resistance of the material is better, the elongation is better, but the heat distortion temperature is lower, and the overall performance is the best in Example 2. However, by adjusting the ethylene content, the functional group grafting rate and the viscosity of PET are matched in the present application, while the impact strength and heat distortion temperature of the material are ensured.

[0098] From Comparative Examples 2, 6, 7, it can be seen that when the viscosity of PET is changed, the heat distortion temperature of the material changes greatly, the impact strength changes, and the overall performance is the best in Example 2. The DSC graph of the PET composite material prepared in Example 2 is shown in Figure 2; and Figure 1 is the DSC graph of the pure PET material for comparison.

[0099] From the above, it can be seen that the ethylene content and functional group grafting rate in the impact modifier, and the viscosity of the PET material, all affect the overall performance of the material. After comprehensive research, it is found that the combination in Example 2 of the present application can prepare a PET composite material with the best overall performance.

[0100] From the data of Comparative Example 2 and Examples 8-9, it can be seen that changing the granulation temperature affects the impact strength, heat distortion temperature, tensile strength and elongation of the prepared PET composite material, especially the elongation. Among them, the granulation temperature of Example 9 is 278℃, and the impact strength and elongation are significantly reduced, and the granulation temperature of Example 2 is 265℃, which is the best.

[0101] From the data of Comparative Example 2 and Examples 10-11, it can be seen that changing the screw speed of the granulator affects the impact strength and elongation of the prepared PET composite material, and the screw speed of Example 2 is 385r / min, which is the best.

[0102] Example 12

[0103] The present embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0104] (1) The impact modifier (polyethylene acrylate grafted GMA) 1.5% (ethylene content 92%, functional group grafting rate 3%), nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.4%, nucleating agent (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, and PET 96.2% (viscosity 0.92) are weighed according to the following ratio, mixed uniformly, and stirred for 5 minutes by a stirrer;

[0105] (2) into TSE-95 double screw granulator, granulation of the final product.

[0106] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0107] Example 13

[0108] The present embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0109] (1) The following components are weighed according to the following proportions: impact modifier (polyethylene acrylate grafted GMA) 3% (ethylene content 92%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.2%, nucleation promoter (molecular weight 700 epoxy resin) 1.2%, adhesion promoter (TPEE) 0.7%, and PET 96.4% (viscosity 0.92). The components are mixed uniformly, and stirred for 5 minutes by a stirrer;

[0110] (2) into TSE-95 double screw granulator, granulation of the final product.

[0111] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0112] Example 14

[0113] The present embodiment provides a PET composite material with high temperature resistance, which is prepared by the following method:

[0114] (1) The following components are weighed according to the following proportions: impact modifier (polyethylene acrylate grafted GMA) 3% (ethylene content 92%, functional group grafting rate 3%); nucleating agent (N-butyl pyrrole acid potassium / sodium salt complex) 0.2%, nucleation promoter (molecular weight 700 epoxy resin) 2%, adhesion promoter (TPEE) 0.7%, and PET 95.6% (viscosity 0.92). The components are mixed uniformly, and stirred for 5 minutes by a stirrer;

[0115] (2) into TSE-95 double screw granulator, granulation of the final product.

[0116] Preferably, in step (2), the granulation temperature is 265°C, and the screw rotation speed is 385 r / min; after granulation, the particles are subjected to mechanical property and temperature resistance test sample strips made by injection molding, the injection molding temperature is 268°C, and the mold temperature is 50°C.

[0117] The test data for Examples 12-14 are as follows:

[0118] Example Impact Strength Heat Distortion Temperature (0.455 MPa Test) Tensile Strength Elongation Bending Strength Bending Modulus 122.1 KJ / m2 207°C 85 MPa 77% 88 MPa 3976 MPa 134.6 KJ / m2 298°C 82 MPa 97% 83 MPa 3256 MPa 142.0 KJ / m2 294°C 78 MPa 86% 81 MPa 3056 MPa

[0119] The above described embodiments only express the specific embodiment of the present application, which is described in more detail and in more detail, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that for those skilled in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A PET composite material with high temperature resistance, characterized in that, It comprises the following components by weight: PET 90.6-96.4%, impact modifier 1-4%, nucleating agent 0.1-0.4%, nucleating promoter 0.8-2%, adhesion promoter 0.5-2%.

2. The PET composite material with high temperature resistance according to claim 1, characterized in that, It comprises the following components by weight: PET 90.6-96.4%, impact modifier 1-4%, nucleating agent 0.1-0.4%, nucleating promoter 1.2-2%, adhesion promoter 0.7-2%.

3. The PET composite material with high temperature resistance according to claim 1, characterized in that, The impact modifier is polyethylene acrylate grafted epoxy, with ethylene content of 85-95% and functional group grafting rate of 1.5-4%.

4. The PET composite material with high temperature resistance according to claim 1, characterized in that, Polyethylene acrylate grafted epoxy, with ethylene content of 92-95% and functional group grafting rate of 1.5-4%.

5. The PET composite material with high temperature resistance according to claim 1, characterized in that, Polyethylene acrylate grafted epoxy, with ethylene content of 92-95% and functional group grafting rate of 3-4%.

6. The PET composite material with high temperature resistance according to claim 1, characterized in that, The viscosity of the PET is 0.8-1.

2.

7. The PET composite material with high temperature resistance according to claim 1, characterized in that, The viscosity of the PET is 0.9-1.

2.

8. The PET composite material with high temperature resistance according to claim 1, characterized in that, The nucleating promoter is high-temperature resistant ester plasticizer, and the high-temperature resistance is 5% weight loss temperature greater than 320℃.

9. The PET composite material with high temperature resistance according to claim 1, characterized in that, The adhesion promoter is anhydride, epoxy, and furan-based auxiliary.

10. The PET composite material with high temperature resistance according to claim 1, characterized in that, The nucleating agent is N-butyl pyrrolidine potassium / sodium salt complex.

11. The PET composite material with high temperature resistance according to claim 1, characterized in that, It further comprises 0.3-0.5% of surface scratch-proofing agent by weight.

12. The PET composite material with high temperature resistance according to claim 1, characterized in that, The impact strength of the PET composite is 1.9 KJ / m 2 - 3.8 KJ / m 2 ; the heat distortion temperature at 0.455 Mpa is 99-106°C.

13. A method for preparing a PET composite material with high temperature resistance, characterized in that, It comprises the following steps: (1) The components are weighed according to any one of claims 1-12, mixed uniformly, and stirred for 5 minutes by a stirrer; (2) It is put into a granulator to prepare the final product.

14. The method according to claim 13, wherein the PET composite material with high temperature resistance is prepared by the following steps: 1) mixing PET, glass fiber, and a coupling agent to obtain a mixture; 2) mixing the mixture obtained in step 1) with a curing agent to obtain a PET composite material with high temperature resistance. In step (2), the granulation temperature is 250-280℃, and the screw rotation speed is 300-500r / min; after granulation, the particles are used to prepare test bars for mechanical property and temperature resistance by injection molding, with injection molding temperature of 265-275℃ and mold temperature of 35-55℃.

15. The method according to claim 14, wherein the PET composite material with high temperature resistance is prepared by the following steps: 1) mixing PET, glass fiber, and a coupling agent to obtain a mixture; 2) mixing the mixture obtained in step 1) with a curing agent to obtain a PET composite material with high temperature resistance. In step (2), the granulation temperature is 265℃, and the screw rotation speed is 385r / min; the injection molding temperature is 268℃, and the mold temperature is 50℃.

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