Continuous glass fiber reinforced modified PET unidirectional prepreg tape and preparation method thereof

Abstract

The invention discloses a continuous glass fiber reinforced modified PET unidirectional prepreg tape and a preparation method thereof, and belongs to the technical field of thermoplastic composites.The preparation method comprises the steps that 100 parts by mass of pure PET resin particles, 0.2-0.5 part by mass of an antioxidant, 5-10 parts by mass of a compatilizer, 0.1-0.5 part by mass of a nucleating agent and 0.4-1 part by mass of a lubricant are put into a high-speed stirring mixer to be mixed and then added into a double-screw extruder to be granulated; modified PET resin particles are obtained; melting and extruding 30-40 parts of dried modified PET resin particles into a dipping mold through a resin extrusion system, and fully infiltrating with 60-70 parts of continuous glass fibers; cooling and shaping; finally, the continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained through edge cutting and rolling according to the required width, the compatilizer, the lubricant and the nucleating agent have a synergistic effect, and the mechanical property of the product and the compatibility effect of the glass fiber and PET are jointly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoplastic composite materials, and particularly relates to a continuous glass fiber reinforced modified PET unidirectional prepreg tape and a preparation method thereof. Background Art

[0002] At present, the matrix resins of continuous glass fiber reinforced thermoplastic unidirectional prepreg tapes reported in the domestic market are mostly polyethylene (PE), polypropylene (PP) and polyamide (PA), among which continuous glass fiber reinforced PP unidirectional prepreg tapes are the most widely used, and there are few reports on continuous glass fiber reinforced polyethylene terephthalate (PET) unidirectional prepreg tapes.

[0003] PET is produced through the polycondensation reaction of terephthalic acid and ethylene glycol. Its molecular structure is linear, with high crystallinity, resulting in excellent mechanical properties, dimensional stability, and high-temperature resistance. Compared to traditional continuous glass fiber-reinforced PP unidirectional prepreg tapes, continuous glass fiber-reinforced PET unidirectional prepreg tapes offer superior mechanical properties and high-temperature resistance. However, the wetting compatibility between pure PET and glass fiber is poor, especially when the glass fiber content exceeds 30%. Even glass fiber treated with a silane coupling agent struggles to fully wet pure PET, resulting in a significant amount of dry yarn on the surface of the resulting continuous glass fiber-reinforced PET unidirectional prepreg tapes. Summary of the Invention

[0004] In response to the above-mentioned deficiencies in the prior art, the present application provides a continuous glass fiber reinforced modified PET unidirectional prepreg and a preparation method thereof, which solves technical problems such as the impregnation compatibility of pure PET and continuous glass fiber existing in the prior art. In order to obtain a continuous glass fiber reinforced PET unidirectional prepreg with good appearance, the present invention first adds a compatibilizer, an antioxidant, a nucleating agent, and a lubricant to pure PET resin particles for blending and granulation to obtain modified PET resin particles; then, the modified PET is used to melt-impregnate the continuous glass fiber, and through the synergistic effect of the compatibilizer and nucleating agent, the compatibilizer and lubricant, finally obtains a continuous glass fiber reinforced modified PET unidirectional prepreg with good appearance and excellent mechanical properties.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The preparation method of continuous glass fiber reinforced modified PET unidirectional prepreg tape comprises the following steps:

[0007] The first step is material drying: place the pure PET resin particles and compatibilizer in a blast drying oven at 120-130℃ for 3-4 hours;

[0008] Step 2: Mixing: 100 parts of pure PET resin particles, 0.3-0.5 parts of antioxidant, 5-10 parts of compatibilizer, 0.1-0.5 parts of nucleating agent, and 0.4-1 parts of lubricant are placed in a high-speed stirring mixer and mixed for 5-10 minutes to obtain a uniform mixture;

[0009] The third step is granulation: the uniformly mixed raw materials are added into a twin-screw extruder for granulation to obtain modified PET resin particles;

[0010] Step 4: Drying: Place the modified PET resin pellets in a forced air drying oven at 120-130°C for 3-4 hours;

[0011] Step 5: Take 30-40 parts of the dried modified PET resin particles according to the mass ratio and melt them into the impregnation mold through the resin extrusion system, and fully impregnate them with 60-70 parts of continuous glass fibers. Before impregnation, the glass fibers are adjusted by the spreading roller, and the temperature of the spreading roller is set to 140-170℃;

[0012] Step 6: After cooling and shaping and cutting the edges according to the required width, the continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained by winding.

[0013] Preferably, the intrinsic viscosity of the pure PET resin particles in the first step is 0.6-1.5 dl / g, the compatibilizer is one or more of acrylate, acrylate maleic anhydride copolymer, and acrylate glycidyl methacrylate copolymer, and the moisture content of the pure PET resin particles after drying is less than 100 ppm.

[0014] Preferably, the compatibilizer in the first step is an acrylate maleic anhydride copolymer and / or an acrylate glycidyl methacrylate copolymer.

[0015] Preferably, the antioxidant in the second step is hindered phenol antioxidant 1010 and / or phosphite antioxidant 168, the nucleating agent is a saturated carboxylic acid sodium salt, the lubricant is an internal and external lubricant of a dendritic polyester structure containing a carboxyl polar functional group, and the stirring speed of the high-speed stirring mixer in the second step is 500-1500 r / min.

[0016] Preferably, in the third step, the temperature of screw zones 1 and 2 of the twin-screw extruder is 220°C-225°C, the temperature of screw zones 3 and 4 is 230°C-235°C, and the temperature of screw zones 5, 6 and 7 is 240°C-250°C.

[0017] Preferably, the moisture content of the modified PET resin particles after drying in the fourth step is less than 100 ppm.

[0018] Preferably, in the resin extrusion system in the fifth step, the temperature of the melt extrusion zone 1 is 240-245°C, the temperature of the zone 2 is 250-255°C, the temperature of the zone 3 is 260-265°C, the temperature of the zone 4 is 265-270°C, and the die head temperature is 265-270°C. The continuous glass fiber is an alkali-free glass fiber impregnated with a silane coupling agent, the linear density of the continuous glass fiber is 1200-2400tex, the fiber diameter is 17μm, and the silane coupling agent is one or more of vinyl silane, aminosilane, and epoxy silane.

[0019] Preferably, the linear density of the continuous glass fiber is 1200 tex, and the silane coupling agent is an aminosilane coupling agent.

[0020] Preferably, in the sixth step, the temperature of the cooling roller is 40° C., the cooling method is water cooling, and the machine speed corresponding to the pressing roller shaping is 5 m / min.

[0021] The present application also discloses a continuous glass fiber reinforced modified PET unidirectional prepreg tape prepared by any of the above preparation methods.

[0022] Principle explanation: Continuous glass fiber has the characteristics of high strength and high modulus, and its strength is several times that of ordinary steel. Among thermoplastic resins, PET resin has good fluidity and temperature resistance. In the process of prepreg preparation, the modified PET resin can fully penetrate into the glass fiber treated with silane coupling agent in the molten state, and can form chemical bonds with the active groups on the surface of the glass fiber, which can greatly improve the interfacial bonding strength between PET resin and glass fiber, so that when the composite material is subjected to external force, the stress can be more effectively transferred between the glass fiber and the matrix, avoiding the occurrence of destructive phenomena such as interface debonding.

[0023] Beneficial effects:

[0024] 1. This application first modifies PET to obtain modified PET resin particles with good compatibility with continuous glass fiber, and finally produces modified PET unidirectional prepreg with high glass fiber content by melt impregnation;

[0025] 2. This application solves the problem of impregnation compatibility between continuous glass fiber and PET resin through the synergistic effect of a compatibilizer and a lubricant, thereby obtaining a continuous glass fiber-reinforced modified PET unidirectional prepreg with good appearance. This is because the maleic anhydride and epoxy functional groups in the compatibilizer can react with the hydroxyl functional groups on the surface of the glass fiber. Secondly, according to the principle of like dissolves like, acrylate and PET also have good compatibility, so the compatibilizer acts like a bridge to connect PET and glass fiber. At the same time, a certain amount of lubricant can improve the fluidity of PET and enhance the impregnation effect of PET and glass fiber. Therefore, the compatibilizer and lubricant in the present invention have a synergistic effect, jointly improving the compatibility of glass fiber and PET.

[0026] 3. Compared with traditional continuous glass fiber reinforced PP and pure PET unidirectional prepreg tapes, the continuous glass fiber reinforced modified PET unidirectional prepreg tape and its preparation method in this application have better mechanical properties. At the same glass fiber content, the unidirectional prepreg tape in this application has a maximum tensile strength of 1115 MPa and a tensile modulus of 39 GPa, and has a good appearance, which is superior to the pure PET unidirectional prepreg tape with the same glass fiber content; this is mainly because the addition of the nucleating agent can accelerate the crystallization of PET and form an ordered crystalline structure, and the compatibilizer combines PET and glass fiber like a bridge. Therefore, the compatibilizer and the nucleating agent have a synergistic effect and jointly improve the mechanical properties of the product described in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a process flow chart for preparing continuous glass fiber reinforced modified PET unidirectional prepreg tape for this application.

[0028] Explanation of the accompanying reference numerals: 1. yarn rack; 2. yarn unrolling system; 3. resin extrusion system; 4. impregnation mold; 5. cooling and trimming system; 6. winding. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the examples. It should be understood that the following examples are only intended to explain and illustrate the present invention, but are not intended to limit the present invention to these specific embodiments and are not intended to limit the scope of the present invention in any way.

[0030] Acrylate maleic anhydride copolymer was purchased from SK Company with the brand name LOTADER3410.

[0031] Acrylate methacrylate glycidyl ester copolymer was purchased from SK Company with the brand name LOTADERAX8900.

[0032] Saturated carboxylic acid sodium salt was purchased from Weihai Chenyuan, brand CYD-HE101.

[0033] Internal and external lubricants were purchased from Weihai Chenyuan, brand CYD-ET05;

[0034] Alkali-free glass fiber impregnated with silane coupling agent, brand Taishan Fiberglass T835.

[0035] Example 1

[0036] The preparation method of continuous glass fiber reinforced modified PET unidirectional prepreg tape comprises the following steps:

[0037] The first step is material drying: pure PET resin particles and a compatibilizer are placed in a 120°C forced air drying oven for 4 hours. The intrinsic viscosity of the pure PET resin particles is 0.68 dl / g, and the moisture content of the dried pure PET resin particles is less than 0.01%. The compatibilizer is a copolymer of acrylate and maleic anhydride.

[0038] The second step is mixing: 100 parts of pure PET resin particles, 0.3 parts of antioxidant, 5 parts of compatibilizer, 0.1 parts of nucleating agent, and 0.4 parts of lubricant are placed in a high-speed stirring mixer and mixed for 5 minutes at a stirring speed of 1000 r / min to obtain a uniformly mixed raw material; the antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168, wherein the hindered phenol antioxidant 1010 is 0.1 parts and the phosphite antioxidant 168 is 0.2 parts; the nucleating agent is a sodium salt of an aliphatic carboxylic acid; and the lubricant is an internal and external lubricant of a dendritic polyester structure containing a carboxyl polar functional group;

[0039] The third step is granulation: the uniformly mixed raw materials are added into a twin-screw extruder for granulation to obtain modified PET resin particles. The screw temperature from zone 1 to zone 7 is 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, and 245℃ respectively;

[0040] Step 4: Drying: The modified PET resin particles are placed in a blast drying oven at 120°C for 4 hours. The moisture content of the modified PET resin particles after drying is less than 100 ppm.

[0041] Step 5: If Figure 1 As shown, the continuous glass fiber on the creel 1 is first processed by the yarn spreading system 2. The continuous glass fiber is an alkali-free glass fiber that has been impregnated with a silane coupling agent, has a linear density of 1200 tex, and a diameter of 17 μm. The silane coupling agent is an aminosilane coupling agent. The temperature of the yarn spreading roller in the yarn spreading system 2 is set to 140°C. Then, 40 parts of the dried modified PET resin particles are melt-extruded into the impregnation mold 4 through the resin extrusion system 3 according to the mass ratio, and are fully impregnated with 60 parts of the continuous glass fiber treated by the yarn spreading system 2 in the impregnation mold 4. The melt extrusion temperatures of the resin extrusion system 3 are 240°C, 250°C, 260°C, and 265°C from zone 1 to zone 4, and the die head temperature is 265°C.

[0042] Step 6: After shaping and trimming by the cooling and trimming system 5; the temperature of the cooling roller is 40°C, the cooling method is water cooling, and the speed is 5m / min; finally, after winding 6, a continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained.

[0043] Example 2

[0044] The preparation method of continuous glass fiber reinforced modified PET unidirectional prepreg tape comprises the following steps:

[0045] The first step is material drying: pure PET resin particles and a compatibilizer are placed in a 130°C forced air drying oven for 3 hours. The intrinsic viscosity of the pure PET resin particles is 0.68 dl / g, and the moisture content of the dried pure PET resin particles is less than 0.01%. The compatibilizer is a copolymer of acrylate and maleic anhydride.

[0046] The second step is mixing: 100 parts of pure PET resin particles, 0.39 parts of antioxidant, 7 parts of compatibilizer, 0.3 parts of nucleating agent, and 0.7 parts of lubricant are placed in a high-speed stirring mixer and mixed for 10 minutes at a stirring speed of 500-1500 r / min to obtain a uniformly mixed raw material; the antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168, wherein the hindered phenol antioxidant 1010 is 0.13 parts and the phosphite antioxidant 168 is 0.26 parts; the nucleating agent is a sodium salt of an aliphatic carboxylic acid; and the lubricant is an internal and external lubricant of a dendritic polyester structure containing a carboxyl polar functional group;

[0047] The third step is granulation: the uniformly mixed raw materials are added into a twin-screw extruder for granulation to obtain modified PET resin particles. The screw temperature from zone 1 to zone 7 is 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, and 245℃ respectively;

[0048] Step 4: Drying: The modified PET resin particles are placed in a forced air drying oven at 130°C for 3 hours. The moisture content of the dried modified PET resin particles is less than 100 ppm.

[0049] Step 5: The continuous glass fiber on the creel 1 is first processed by the yarn spreading system 2. The continuous glass fiber is an alkali-free glass fiber that has been impregnated with a silane coupling agent, has a linear density of 1200 tex, and a diameter of 17 μm. The silane coupling agent is an aminosilane coupling agent. The temperature of the yarn spreading roller in the yarn spreading system 2 is set to 150°C, and then 35 parts of the dried modified PET resin particles are melt-extruded into the impregnation mold 4 through the resin extrusion system 3 according to the mass ratio, and are fully impregnated with 65 parts of the continuous glass fiber treated by the yarn spreading system 2 in the impregnation mold 4; the melt extrusion temperatures of the resin extrusion system 3 are 245°C, 255°C, 265°C, and 270°C from zone 1 to zone 4, and the die head temperature is 270°C;

[0050] Step 6: After the cooling and trimming system 5 trims the edges; the temperature of the cooling roller is 40°C, the cooling method is water cooling, and the speed is 5m / min; finally, after the winding 6, a continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained.

[0051] Example 3

[0052] The preparation method of continuous glass fiber reinforced modified PET unidirectional prepreg tape comprises the following steps:

[0053] The first step is material drying: pure PET resin particles and a compatibilizer are placed in a forced air drying oven at 125°C for 3.5 hours. The intrinsic viscosity of the pure PET resin particles is 0.68 dl / g, and the moisture content of the dried pure PET resin particles is less than 0.01%. The compatibilizer is a copolymer of acrylate and maleic anhydride.

[0054] The second step is mixing: 100 parts of pure PET resin particles, 0.48 parts of antioxidant, 10 parts of compatibilizer, 0.5 parts of nucleating agent, and 1 part of lubricant are placed in a high-speed stirring mixer and mixed for 7 minutes at a stirring speed of 500-1500 r / min to obtain a uniformly mixed raw material; the antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168, wherein the hindered phenol antioxidant 1010 is 0.16 parts and the phosphite antioxidant 168 is 0.32 parts; the nucleating agent is a saturated carboxylic acid sodium salt; and the lubricant is an internal and external lubricant of a dendritic polyester structure containing a carboxyl polar functional group;

[0055] The third step is granulation: the uniformly mixed raw materials are added into a twin-screw extruder for granulation to obtain modified PET resin particles. The screw temperature from zone 1 to zone 7 is 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, and 245℃ respectively;

[0056] Step 4: Drying: The modified PET resin particles are placed in a forced air drying oven at 125°C for 3.5 hours. The moisture content of the dried modified PET resin particles is less than 100 ppm.

[0057] Step 5: The continuous glass fiber on the creel 1 is first processed by the yarn spreading system 2. The continuous glass fiber is an alkali-free glass fiber that has been impregnated with a silane coupling agent, has a linear density of 1200 tex, and a diameter of 17 μm. The silane coupling agent is an aminosilane coupling agent. The temperature of the yarn spreading roller in the yarn spreading system 2 is set to 170°C, and then 30 parts of the dried modified PET resin particles are melt-extruded into the impregnation mold 4 through the resin extrusion system 3 according to the mass ratio, and are fully impregnated with 70 parts of the continuous glass fiber treated by the yarn spreading system 2 in the impregnation mold 4; the melt extrusion temperature of the resin extrusion system 3 is 240°C, 255°C, 260°C, and 270°C from zone 1 to zone 4, and the die head temperature is 270°C;

[0058] Step 6: After shaping and trimming by the cooling and trimming system 5; the temperature of the cooling roller is 40°C, the cooling method is water cooling, and the speed of the pressure roller shaping is 5m / min; finally, after winding 6, a continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained.

[0059] Comparative Example 1

[0060] The preparation method of continuous glass fiber reinforced modified PET unidirectional prepreg tape comprises the following steps:

[0061] The first step is material drying: the pure PET resin pellets and the compatibilizer are placed in a 120°C forced air drying oven for 4 hours; the intrinsic viscosity of the pure PET resin pellets is 0.68 dl / g, and the moisture content of the dried pure PET resin pellets is less than 0.01%;

[0062] In the second step, the continuous glass fiber on the yarn rack 1 is first processed by the yarn spreading system 2. The continuous glass fiber is an alkali-free glass fiber impregnated with a silane coupling agent, has a linear density of 1200tex, and a diameter of 17μm. The silane coupling agent is an aminosilane coupling agent. The temperature of the yarn spreading roller in the yarn spreading system 2 is set to 140°C, and then 40 parts of dried pure PET resin particles are melt-extruded into the impregnation mold 4 through the resin extrusion system 3 according to the mass ratio, and are fully impregnated with 60 parts of the continuous glass fiber treated by the yarn spreading system 2 in the impregnation mold 4; the melt extrusion temperature of the resin extrusion system 3 is 240°C, 250°C, 260°C, and 265°C from zone 1 to zone 4, and the die head temperature is 265°C.

[0063] Step 3: After cooling and trimming system 5; shaping and trimming; the cooling roller temperature is 40°C, the cooling method is water cooling, the speed is 5m / min, and finally after winding 6, a continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained.

[0064] Comparative Example 2

[0065] The preparation method of the continuous glass fiber reinforced modified PET unidirectional prepreg is the same as that of Example 2 except that no compatibilizer is added.

[0066] Comparative Example 3

[0067] Except that no lubricant is added, other contents are the same as those in Example 1.

[0068] Comparative Example 4

[0069] Except for not adding the nucleating agent, other contents are the same as those in Example 1.

[0070] Comparative Example 5

[0071] Except for not adding compatibilizer, other contents are the same as those in Example 2.

[0072] Comparative Example 6

[0073] Except that no lubricant is added, other contents are the same as those in Example 2.

[0074] Comparative Example 7

[0075] Except for not adding the nucleating agent, other contents are the same as those in Example 2.

[0076] Comparative Example 8

[0077] Except for not adding compatibilizer, other contents are the same as those in Example 3.

[0078] Comparative Example 9

[0079] Except that no lubricant is added, other contents are the same as those in Example 3.

[0080] Comparative Example 10

[0081] Except for not adding the nucleating agent, other contents are the same as those in Example 3.

[0082]

[0083] By comparing Example 1 with Comparative Example 1, it can be found that the unmodified PET cannot form a good impregnation effect with the continuous glass fiber, and a large amount of dry yarn exists.

[0084] Comparing Examples 1, 2, and 3 with Comparative Examples 2, 5, and 8 reveals that the absence of a compatibilizer not only results in poor compatibility between the glass fiber and the resin infiltration, but also severely impacts the mechanical properties of the product. This is primarily due to the reaction of the maleic anhydride functional groups in the compatibilizer with the hydroxyl functional groups on the surface of the glass fiber. Furthermore, according to the principle of like dissolves like, acrylates and PET also exhibit good compatibility. Therefore, the compatibilizer acts like a bridge, tightly connecting the PET and glass fiber, improving the compatibility between the glass fiber and the resin and enhancing the mechanical properties of the product.

[0085] Comparing Examples 1, 2, and 3 with Comparative Examples 3, 6, and 9, it can be found that the absence of a lubricant has little effect on the mechanical properties of the product, but does affect the wetting effect between the glass fiber and the resin. This is primarily because the addition of a lubricant improves the fluidity of the resin and reduces friction between the resin and the equipment. The lubricant also regulates the interfacial interaction between the resin and the fiber, and the lubricant molecules form a buffer layer between the resin and the fiber, improving the compatibility between the resin and the fiber. Therefore, the compatibilizer and lubricant have a synergistic effect in improving the compatibility between the glass fiber and the resin.

[0086] Comparison of Examples 1, 2, and 3 with Comparative Examples 4, 7, and 10 reveals that the absence of a nucleating agent does not affect the compatibility of the resin and glass fiber, but does reduce the mechanical properties of the product. This is primarily due to the poor crystallization ability of PET resin itself. The addition of a nucleating agent can induce rapid crystallization of PET, forming an ordered crystalline structure. This ordered crystalline structure results in a tighter and more regular arrangement of the molecular chains within the material. When subjected to tensile forces, the molecular chains can more effectively share the external forces, thereby improving the mechanical properties of the product. This demonstrates that the compatibilizer and nucleating agent have a synergistic effect in improving the mechanical properties of the product.

[0087] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a continuous glass fiber reinforced modified PET unidirectional prepreg tape, characterized in that: The following steps are involved: The first step is material drying: place the pure PET resin particles and compatibilizer in a blast drying oven at 120-130℃ for 3-4 hours; Step 2: Mixing: 100 parts of pure PET resin particles, 0.3-0.5 parts of antioxidant, 5-10 parts of compatibilizer, 0.1-0.5 parts of nucleating agent, and 0.4-1 parts of lubricant are placed in a high-speed stirring mixer and mixed for 5-10 minutes to obtain a uniform mixture; The third step is granulation: the uniformly mixed raw materials are added into a twin-screw extruder for granulation to obtain modified PET resin particles; Step 4: Drying: Place the modified PET resin pellets in a forced air drying oven at 120-130°C for 3-4 hours; Step 5: Take 30-40 parts of the dried modified PET resin particles according to the mass ratio and melt them into the impregnation mold through the resin extrusion system, and fully impregnate them with 60-70 parts of continuous glass fibers. Before impregnation, the glass fibers are adjusted by the spreading roller, and the temperature of the spreading roller is set to 140-170℃; Step 6: After cooling and shaping and cutting the edges according to the required width, the continuous glass fiber reinforced modified PET unidirectional prepreg tape is obtained by winding.

2. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: In the first step, the intrinsic viscosity of the pure PET resin particles is 0.6-1.5 dl / g, the compatibilizer is one or more of acrylate, acrylate maleic anhydride copolymer, and acrylate glycidyl methacrylate copolymer, and the moisture content of the pure PET resin particles after drying is less than 100 ppm.

3. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 2, characterized in that: The compatibilizer in the first step is an acrylate maleic anhydride copolymer and / or an acrylate glycidyl methacrylate copolymer.

4. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: In the second step, the antioxidant is hindered phenol antioxidant 1010 and / or phosphite antioxidant 168, the nucleating agent is saturated carboxylic acid sodium salt, the lubricant is an internal and external lubricant of a dendritic polyester structure containing carboxyl polar functional groups, and the stirring speed of the high-speed stirring mixer in the second step is 500-1500 r / min.

5. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: In the third step, the temperature of the screw zones 1 and 2 of the twin-screw extruder is 220-225°C, the temperature of the screw zones 3 and 4 is 230-235°C, and the temperature of the screw zones 5, 6 and 7 is 240-250°C.

6. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: The moisture content of the modified PET resin particles after drying in the fourth step is less than 100 ppm.

7. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: In the resin extrusion system in the fifth step, the temperature of the melt extrusion zone 1 is 240-245°C, the temperature of the zone 2 is 250-255°C, the temperature of the zone 3 is 260-265°C, the temperature of the zone 4 is 265-270°C, and the die head temperature is 265-270°C. The continuous glass fiber is an alkali-free glass fiber impregnated with a silane coupling agent, the linear density of the continuous glass fiber is 1200-2400tex, the fiber diameter is 17μm, and the silane coupling agent is one or more of vinyl silane, aminosilane, and epoxy silane.

8. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 7, characterized in that: The linear density of the continuous glass fiber is 1200 tex, and the silane coupling agent is an aminosilane coupling agent.

9. The method for preparing the continuous glass fiber reinforced modified PET unidirectional prepreg according to claim 1, characterized in that: In the sixth step, the temperature of the cooling roller is 40° C., the cooling method is water cooling, and the corresponding machine speed is 5 m / min.

10. A continuous glass fiber reinforced modified PET unidirectional prepreg tape prepared by the preparation method according to any one of claims 1 to 9.

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