A continuous glass fiber reinforced nylon 12 prepreg tape and method of making the same

Abstract

The application belongs to the field of continuous fiber reinforced thermoplastic composite materials, and relates to a continuous glass fiber reinforced nylon 12 prepreg tape and a preparation method thereof.Raw materials contain the following components in parts by weight: dicarboxyl-terminated nylon 12 oligomer 20-60 parts, diamino-terminated nylon 12 oligomer 20-60 parts, continuous glass fiber 20-140 parts, molecular weight regulator 0.1-1 part, catalyst 0.05-0.5 part, antioxidant 0.2-0.5 part, and lubricant 0.2-0.5 part.The application can realize sufficient impregnation of the nylon 12 oligomer on the continuous glass fiber by controlling the molecular weight and the melt viscosity of the nylon 12 oligomer, so as to prepare a high-performance continuous glass fiber reinforced nylon 12 prepreg tape.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of continuous fiber reinforced thermoplastic composites, in particular to a continuous glass fiber reinforced nylon 12 prepreg tape and a preparation method thereof. BACKGROUND

[0002] Nylon 12 is a long-chain nylon material prepared by ring-opening polymerization of dodecanolactam, which has excellent cold resistance, salt mist resistance, solvent resistance and low water absorption. The use of continuous glass fiber to reinforce and modify nylon 12 to prepare continuous glass fiber reinforced nylon 12 prepreg tape can further improve the comprehensive mechanical properties of nylon 12 and further expand its application field.

[0003] Continuous glass fiber reinforced thermoplastic prepreg tape is a kind of composite material with high rigidity, high strength, high impact resistance and complete recyclability, which is prepared by corresponding impregnation process with thermoplastic resin as matrix and continuous glass fiber as reinforcing material. It has broad application prospects in the fields of aerospace, high-speed rail, automobile, ship, household appliance, etc. At present, the preparation methods of continuous fiber reinforced thermoplastic prepreg tape include melt impregnation method, solution impregnation method, powder impregnation method and film lamination method, etc. Among them, the melt impregnation method is widely used due to its relatively simple equipment process and low investment cost.

[0004] Melt impregnation method is to pass the uniformly expanded continuous fiber through the impregnation die filled with molten resin, and the fiber is fully impregnated with resin in the impregnation die to form a fiber tape. The impregnated fiber tape is cooled and shaped after being taken out of the mold to obtain continuous fiber reinforced thermoplastic prepreg tape. Due to the high molecular weight and high melt viscosity of the resin, it is not conducive to penetrate into the gap between the fiber bundle and fully impregnate the fiber, which is prone to "dry yarn" defects and deteriorates the mechanical properties of the prepreg tape. Therefore, improving the flowability of resin melt to improve the impregnation of resin melt to fiber is the key to preparing high-performance continuous fiber reinforced thermoplastic prepreg tape by melt impregnation process. SUMMARY

[0005] The purpose of the present application is to provide a continuous glass fiber reinforced nylon 12 prepreg tape and a preparation method thereof.

[0006] The main technical problem faced by the present application is to improve the impregnation of nylon 12 resin to continuous glass fiber.

[0007] To solve the above technical problems, the technical principle adopted by the present application is that: the reason why the conventional nylon 12 resin is difficult to fully impregnate the glass fiber is that the melt viscosity of the nylon 12 with high molecular weight is high, and the flowability is poor, so it is difficult to fully penetrate into the gap between the glass fiber tows to cause the “dry yarn” defect. In the present application, the nylon 12 oligomer with reactive double carboxyl-terminated and double amino-terminated is prepared by formula adjustment control, and the nylon 12 with low molecular weight has good flowability, so it can fully penetrate into the gap between the glass fiber tows during the melt impregnation process to achieve full impregnation. After the impregnation is completed, under the action of the catalyst, the molecular weight regulator and the vacuum exhaust system, the double carboxyl-terminated nylon 12 oligomer and the double amino-terminated nylon 12 oligomer occur re-polymerization reaction in the impregnation mold to increase the molecular weight of the nylon 12 to the expected level, so that the high-performance continuous glass fiber reinforced nylon 12 prepreg tape with good impregnation effect is obtained.

[0008] The technical scheme adopted by the present application is:

[0009] A continuous glass fiber reinforced nylon 12 prepreg tape, according to weight parts, the raw materials contain the following components: double carboxyl-terminated nylon 12 oligomer 20-60 parts, double amino-terminated nylon 12 oligomer 20-60 parts, continuous glass fiber 20-140 parts, molecular weight regulator 0.1-1 part, catalyst 0.05-0.5 part, antioxidant 0.2-0.5 part, lubricant 0.2-0.5 part.

[0010] In the present application, the double carboxyl-terminated nylon 12 oligomer has a molecular weight of 1000-3000, preferably 1800-2200, and a carboxyl end group content of 0.65-2.0 mmol / g, preferably 0.90-1.10 mmol / g.

[0011] The preparation method of the double carboxyl-terminated nylon 12 oligomer comprises the following steps:

[0012] (1) ring opening and prepolymerization stage: a certain proportion of dodecanolactam, diacid type end-capping agent and water are added to the reaction kettle, nitrogen is replaced for 3-5 times, heating is carried out to 270-290 DEG C and kept for 3-5 h to complete the ring opening reaction of dodecanolactam;

[0013] (2) pressure relief and melt polycondensation stage: after the ring opening is completed, the pressure is slowly released (for example, at a rate of -2 kPa / s) to 10 kPa, the temperature is lowered to 220-240 DEG C at the same time of pressure relief, then vacuum is extracted to -95 kPa for 0.5-1 h to complete the melt polycondensation;

[0014] (3) discharging and post-treatment stage: after the melt polycondensation is completed, the vacuum extraction is stopped, nitrogen is added to positive pressure to discharge, cool, crush and dry to obtain the double carboxyl-terminated nylon 12 oligomer.

[0015] Preferably, the diacid type capping agent is selected from one of adipic acid, sebacic acid, dodecanedioic acid, more preferably dodecanedioic acid, and the addition amount is 5-30% of the weight of lauryl lactam.

[0016] Preferably, the water is ultrapure water, and the addition amount is 5-15% of the weight of lauryl lactam, more preferably 10%.

[0017] In the present application, the diamino-capped nylon 12 oligomer has a molecular weight of 1000-3000, more preferably 1800-2200, and preferably the content of terminal amino groups is 0.65-2.0 mmol / g, more preferably 0.90-1.10 mmol / g.

[0018] The preparation method of the diamino-capped nylon 12 oligomer is as follows:

[0019] (1) Ring-opening and prepolymerization stage: a certain proportion of lauryl lactam, diacid type capping agent, and water are added to the reaction kettle, replaced with nitrogen for 3-5 times, heated to 270-290°C and kept for 3-5 h to complete the ring-opening reaction of lauryl lactam;

[0020] (2) Pressure relief and melt polycondensation stage: after the ring-opening is completed, slowly relieve the pressure (for example, at a rate of -2 kPa / s) to 10 kPa, and at the same time, reduce the temperature to 220-240°C, then vacuumize to -95 kPa for 0.5-1 h to complete the melt polycondensation;

[0021] (3) Discharge and post-treatment stage: after the melt polycondensation is completed, stop vacuumizing, add nitrogen to positive pressure, discharge, cool, crush, and dry to obtain the diamino-capped nylon 12 oligomer.

[0022] Preferably, the diacid type capping agent is selected from one of adipic acid, sebacic acid, dodecanedioic acid, more preferably dodecanedioic acid, and the addition amount is 5-30% of the weight of lauryl lactam.

[0023] Preferably, the water is ultrapure water, and the addition amount is 5-15% of the weight of lauryl lactam, more preferably 8-12%.

[0024] In some examples, the molar ratio of the dicarboxyl-capped nylon 12 oligomer to the diamino-capped nylon 12 oligomer in the raw material formula is 1:1.

[0025] In some examples, the continuous glass fiber is a no-twist bulk sand that has been surface modified by a coupling agent, and the single filament diameter of the continuous glass fiber is 2400 Tex or 4800 Tex, such as T984, T984T, or T984T2 selected from Taishan Glass Fiber Co., Ltd.

[0026] In some examples, preferably, the molecular weight regulator is selected from one of adipic acid, sebacic acid, dodecanedioic acid, benzoic acid, and lauric acid, more preferably adipic acid.

[0027] In some examples, preferably, the catalyst is selected from one of phosphoric acid, hypophosphorous acid, sodium hypophosphite, potassium hypophosphite, calcium hypophosphite, and more preferably phosphoric acid.

[0028] In some examples, preferably, the antioxidant is selected from one or more of heat-resistant antioxidants, such as antioxidant 1098, antioxidant 1010, antioxidant 168, antioxidant H10, and more preferably an equal mass compounded system of antioxidant 1098 and antioxidant 168.

[0029] In some examples, preferably, the lubricant is selected from one of zinc stearate, calcium stearate, ethylene bis-stearamide (EBS), oleic acid amide, silicone oil, and paraffin wax, and more preferably ethylene bis-stearamide (EBS).

[0030] In another aspect, the present application also provides a method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps:

[0031] (1) raw material mixing step: a certain mass of dicarboxyl-terminated nylon 12 oligomer, diamino-terminated nylon 12 oligomer, molecular weight regulator, catalyst, antioxidant, and lubricant are mixed in a high-speed mixer to prepare a nylon 12 oligomer compound;

[0032] (2) reactive melt impregnation step: the nylon 12 oligomer compound prepared in step (1) is subjected to reactive melt impregnation system to impregnate the spread yarn continuous glass fiber to obtain a molten prepreg tape and realize the repolymerization of the nylon 12 oligomer; then the molten prepreg tape is cooled, pulled, wound, and cut to prepare a continuous glass fiber reinforced nylon 12 prepreg tape product.

[0033] Preferably, the mixing time of step (1) is 5-60 min.

[0034] In some examples, the reactive melt impregnation system comprises a continuous glass fiber unwinding reel, a yarn spreading device, an infrared preheating device, a reactive melt impregnation device, a cooling device, a pulling device, a winding device, and a cutting device; the reactive melt impregnation device comprises a double-screw extruder and a reactive melt impregnation die.

[0035] Preferably, the length-diameter ratio of the double-screw extruder is 40-45, and the rotation speed is 60-200 rpm; the temperature from the feeding section to the die head is set to 180-200℃.

[0036] Preferably, the total length of the reactive melt impregnation mold is 1.5 m, wherein the 0-0.6 m interval is the melt impregnation zone, the temperature is set to 200-260℃; the 0.6-1.2 m interval is the vacuum exhaust reaction zone, three sets of vacuum exhaust systems are installed at 0.6 m, 0.9 m and 1.2 m, the vacuum exhaust system comprises an exhaust chamber, a vacuum pump and a condenser tank, the vacuum pumping rate is 0.2-0.8 L / min, preferably 0.5 L / min, and the temperature is set to 260-280℃; the 1.2-1.5 m interval is the melt flow stabilization zone, and the temperature is set to 280-260℃.

[0037] The fiber content of the continuous fiber reinforced nylon 12 prepreg tape can be controlled by adjusting the feeding rate of the twin-screw extruder and the continuous fiber pulling rate, and the fiber content of the prepreg tape is preferably 25-75%, more preferably 45-55%; the prepreg tape width can be controlled by controlling the effective impregnation width of the reactive melt impregnation mold, and the prepreg tape width is preferably 300-800 mm, more preferably 450-550 mm; the prepreg tape thickness can be controlled by controlling the impregnation slot depth and the die lip gap of the reactive melt impregnation mold, and the prepreg tape thickness is preferably 0.05-0.2 mm, more preferably 0.08-0.12 mm.

[0038] Compared with the prior art, the advantages of the present application mainly lie in:

[0039] The present application prepares a reactive di-carboxyl-terminated and di-amino-terminated nylon 12 oligomer by formula adjustment, and the low molecular weight nylon 12 has good fluidity, which can fully penetrate into the gap between glass fiber tows during melt impregnation processing to achieve full impregnation. After impregnation, under the action of catalyst, molecular weight regulator and vacuum exhaust system, the di-carboxyl-terminated nylon 12 oligomer and the di-amino-terminated nylon 12 oligomer undergo re-polymerization reaction in the impregnation mold to increase the molecular weight of the nylon 12 to the desired level, thereby obtaining a high-performance continuous glass fiber reinforced nylon 12 prepreg tape with good impregnation effect. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Preparation flow chart of the continuous fiber reinforced nylon 12 prepreg tape of the present application

[0041] Figure 1 Legend: 1: twin-screw extruder; 2: vacuum exhaust system; 3: reactive melt impregnation mold; 4: melt impregnation zone; 5: vacuum exhaust reaction zone; 6: melt flow stabilization zone. DETAILED DESCRIPTION

[0042] The present application will be further described below through specific examples, which are only used to illustrate the present application and do not limit the scope of the present application.

[0043] Test method:

[0044] (1) Number average molecular weight test: test by gel permeation chromatography (GPC) system, equipment model is WATERS 1515;

[0045] (2) Amine end group and carboxyl end group content test: test by potentiometric titration method (Metrohm 848 automatic potentiometric titrator);

[0046] (3) Melt viscosity test: test by AR 1500EX (TA Instrument) type rheometer constant shear mode, test temperature is 200°C, shear rate is 1 rad / s, strain is 1%, nitrogen atmosphere protection.

[0047] (4) Nylon 12 number average molecular weight test in continuous glass fiber reinforced nylon 12 prepreg: first use hexafluoroisopropanol to dissolve the continuous glass fiber reinforced nylon 12 prepreg, the concentration is 0.05 g / ml; then centrifugal sedimentation is carried out to the mixed solution, the supernatant is dried to remove hexafluoroisopropanol to obtain purified nylon 12, and then the number average molecular weight is tested by gel permeation chromatography (GPC) system.

[0048] (5) Glass fiber content test in continuous fiber reinforced nylon 12 prepreg: 5-10 g of continuous fiber reinforced nylon 12 prepreg is weighed and placed in a crucible, heated to 700°C for 1 h, and the glass fiber content is calculated according to the remaining ash mass.

[0049] (6) Mechanical property test: after cutting the continuous fiber reinforced nylon 12 prepreg, it is laid according to 0-90-0°, and a 4 mm thick continuous fiber reinforced nylon laminate is prepared by hot pressing with a hot press, then a standard sample is cut on the laminate using a sample cutter for mechanical property test, the hot pressing temperature is 240°C, and the hot pressing time is 5 min.

[0050] a. Tensile strength: test according to the method in ISO 527;

[0051] b. Flexural modulus: test according to the method in ISO 178;

[0052] c. Charpy notched impact strength at room temperature: test according to the method in ISO 179.

[0053] Raw materials and sources:

[0054] Lauryllactam: Arkema; Dodecanedioic acid: Aldrich; Adipic acid: Huafeng Chemical Co., Ltd.; Dodecanediamine: Hubei Hengjingrui Chemical Co., Ltd.; Hexamethylenediamine: DuPont Chemical; Sebacic acid: Aldrich; Phosphoric acid: Beijing Ino Kai Technology Co., Ltd.; Antioxidant 1098: Leighong New Material Co., Ltd.; Antioxidant 168: Leighong New Material Co., Ltd.; EBS: Kao; Continuous glass fiber: Taishan Glass Fiber.

[0055] Preparation of Example 1

[0056] The double-carboxyl-terminated nylon 12 oligomer was prepared according to the following steps:

[0057] a. Ring-opening and prepolymerization stage: 4 kg of lauryllactam, 1192 g of dodecanedioic acid, and 400 g of ultrapure water were sequentially added to the reaction kettle, and nitrogen was replaced for 3 times. The temperature was heated to 280℃ and kept for 5 h to complete the ring-opening reaction of lauryllactam.

[0058] b. Pressure relief and melt polycondensation stage: After the ring-opening was completed, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230℃ at the same time. The vacuum valve was opened to vacuum to -95 KPa for 0.5 h.

[0059] c. Discharge and post-treatment stage: After the melt polycondensation was completed, the vacuum was stopped, and nitrogen was added to the positive pressure to discharge, cool, crush, and dry to obtain the double-carboxyl-terminated nylon 12 oligomer (C-PA12-1). The number average molecular weight of the product was 1003, the carboxyl end group content was 1.994 mmol / g, and the melt viscosity was 0.40 Pa·s.

[0060] Preparation of Example 2

[0061] The double-carboxyl-terminated nylon 12 oligomer was prepared according to the following steps:

[0062] a. Ring-opening and prepolymerization stage: 4 kg of lauryllactam, 1192 g of dodecanedioic acid, and 400 g of ultrapure water were sequentially added to the reaction kettle, and nitrogen was replaced for 3 times. The temperature was heated to 280℃ and kept for 5 h to complete the ring-opening reaction of lauryllactam.

[0063] b. Pressure relief and melt polycondensation stage: After the ring-opening was completed, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230℃ at the same time. The vacuum valve was opened to vacuum to -95 KPa for 0.5 h.

[0064] c. Discharge and post-processing stage: after the completion of melt polycondensation, stop vacuumizing, add nitrogen to positive pressure, discharge, cool, crush, and dry to obtain dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), the number average molecular weight of which is 2001, the carboxyl end group content is 0.999 mmol / g, and the melt viscosity is 0.80 Pa s.

[0065] Preparation of Example 3

[0066] The dicarboxyl-terminated nylon 12 oligomer was prepared according to the following steps:

[0067] a. Ring-opening and prepolymerization stage: 4 kg of lauryl lactam, 208 g of adipic acid, and 400 g of ultrapure water were sequentially added to the reaction kettle, and nitrogen replacement was performed for 3 times. The temperature was increased to 280°C, and the ring-opening reaction of lauryl lactam was completed after 5 h.

[0068] b. Pressure relief and melt polycondensation stage: after the completion of ring-opening, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230°C at the same time. The vacuum valve was opened to vacuumize to -95 kPa for 1 h.

[0069] c. Discharge and post-processing stage: after the completion of melt polycondensation, stop vacuumizing, add nitrogen to positive pressure, discharge, cool, crush, and dry to obtain dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), the number average molecular weight of which is 2001, the carboxyl end group content is 0.999 mmol / g, and the melt viscosity is 0.80 Pa s.

[0070] Preparation of Example 4

[0071] The diamino-terminated nylon 12 oligomer was prepared according to the following steps:

[0072] a. Ring-opening and prepolymerization stage: 4 kg of lauryl lactam, 1178 g of dodecanediamine, and 400 g of ultrapure water were sequentially added to the reaction kettle, and nitrogen replacement was performed for 3 times. The temperature was increased to 280°C, and the ring-opening reaction of lauryl lactam was completed after 5 h.

[0073] b. Pressure relief and melt polycondensation stage: after the completion of ring-opening, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230°C at the same time. The vacuum valve was opened to vacuumize to -95 kPa for 0.5 h.

[0074] c. Discharge and post-processing stage: after the completion of melt polycondensation, stop vacuumizing, add nitrogen to positive pressure, discharge, cool, crush, and dry to obtain diamino-terminated nylon 12 oligomer (N-PA12-1), the number average molecular weight of which is 1002, the amino end group content is 1.995 mmol / g, and the melt viscosity is 0.40 Pa s.

[0075] Preparation of Example 5

[0076] The diamino-terminated nylon 12 oligomer was prepared according to the following steps:

[0077] a. Ring-opening and prepolymerization stage: 4 kg of laurolactam, 514 g of dodecanediamine, and 400 g of ultrapure water were sequentially added to the reaction kettle, which was replaced with nitrogen three times, and heated to 280°C for 5 h to complete the ring-opening reaction of laurolactam;

[0078] b. Pressure relief and melt polycondensation stage: After the ring-opening was completed, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230°C at the same time, and the vacuum valve was opened to vacuum to -95 kPa for 0.5 h.

[0079] c. Discharge and post-treatment stage: After the melt polycondensation was completed, the vacuum was stopped, and nitrogen was added to the positive pressure to discharge, cool, crush, and dry, to obtain the diamino-terminated nylon 12 oligomer (N-PA12-2), the number average molecular weight of which was 2002, the terminal amino group content was 0.999 mmol / g, and the melt viscosity was 0.80 Pa·s.

[0080] Preparation of Example 6

[0081] The diamino-terminated nylon 12 oligomer was prepared according to the following steps:

[0082] a. Ring-opening and prepolymerization stage: 4 kg of laurolactam, 514 g of dodecanediamine, and 400 g of ultrapure water were sequentially added to the reaction kettle, which was replaced with nitrogen three times, and heated to 280°C for 5 h to complete the ring-opening reaction of laurolactam;

[0083] b. Pressure relief and melt polycondensation stage: After the ring-opening was completed, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230°C at the same time, and the vacuum valve was opened to vacuum to -95 kPa for 0.5 h.

[0084] c. Discharge and post-treatment stage: After the melt polycondensation was completed, the vacuum was stopped, and nitrogen was added to the positive pressure to discharge, cool, crush, and dry, to obtain the diamino-terminated nylon 12 oligomer (N-PA12-2), the number average molecular weight of which was 2002, the terminal amino group content was 0.999 mmol / g, and the melt viscosity was 0.80 Pa·s.

[0085] Preparation of Example 7

[0086] The high molecular weight nylon 12 was prepared according to the following steps:

[0087] a. Ring-opening and prepolymerization stage: 4 kg of lauryllactam, 45 g of dodecanedioic acid, and 400 g of ultrapure water were sequentially added to the reaction kettle, and nitrogen was replaced for 3 times. The temperature was increased to 280°C and maintained for 5 h to complete the ring-opening reaction of lauryllactam.

[0088] b. Pressure relief and melt polycondensation stage: After the ring-opening reaction was completed, the pressure in the reaction kettle was relieved to 10 kPa at a relief rate of -2 kPa / s, and the temperature was reduced to 230°C at the same time. The vacuum valve was opened to extract vacuum to -95 kPa for 2 h.

[0089] c. Discharge and post-treatment stage: After the reaction was completed, the vacuum extraction was stopped, nitrogen was added to a slight positive pressure for discharge, and high-molecular-weight nylon 12 (PA12-1’) was obtained through water cooling, pelletizing, and drying. The number average molecular weight of the product was 20245, the carboxyl end group content was 0.098 mmol / g, the amino end group content was 0.003 mmol / g, and the melt viscosity was 230 Pa·s.

[0090] Example 1

[0091] The continuous fiber-reinforced nylon 12 prepreg tape was prepared according to the following method:

[0092] a. Raw material mixing step: 1000 g of double-carboxyl-terminated nylon 12 oligomer (C-PA12-1), 999 g of double-amino-terminated nylon 12 oligomer (N-PA12-1), 18 g of adipic acid, 16 g of phosphoric acid, 10 g of compound antioxidant (equal mass compound of antioxidant 1098 and antioxidant 168), and 10 g of EBS were mixed in a high-speed mixer for 20 min to obtain a nylon 12 oligomer compound.

[0093] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) was melt-conveyed into a reactive melt impregnation mold using a double-screw extruder with a length-diameter ratio of 42, and the rotation speed was 60 rpm. The temperature was set to 180-200°C from the feeding section to the die head.

[0094] c. The nylon 12 melt conveyed from the double-screw extruder completed the impregnation of the continuous glass fiber (Taishan Glass Fiber, T984T, single filament diameter 2400 Tex) after the yarn was unwound in the reactive melt impregnation mold. Among them, the temperature of the reactive impregnation mold was set to 200-260°C at 0-0.6 m, 260-280°C at 0.6-1.2 m, and 280-260°C at 1.2-1.5 m. The vacuum extraction rates of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m, and 1.2 m were 0.8 L / min, 0.5 L / min, and 0.5 L / min, respectively.

[0095] d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 70% fiber prepreg tape with a width of 300 mm and a thickness of 0.05 mm is prepared.

[0096] Example 2

[0097] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0098] a. Raw material mixing step: 1000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-1), 1996 g of diamino-terminated nylon 12 oligomer (N-PA12-2), 21.5 g of adipic acid, 15 g of phosphoric acid, 15 g of a compounded antioxidant (an equal mass compound of antioxidant 1098 and antioxidant 168), and 15 g of EBS are mixed in a high-speed mixer for 20 min to obtain a nylon 12 oligomer compound.

[0099] b. Reactive melt impregnation step: the nylon 12 oligomer compound prepared in step (1) is melt-transported into a reactive melt impregnation die using a twin screw extruder with a length-diameter ratio of 42, and the rotation speed is 120 rpm. The temperature from the feeding section to the die head is set to 180-200°C.

[0100] c. The nylon 12 melt transported from the twin screw extruder completes the impregnation of the spread continuous glass fiber (Taishan Glass Fiber, T984T, single filament diameter 2400 Tex) in the reactive melt impregnation die. Among them, the temperature of the reactive impregnation die from 0-0.6 m is set to 200-260°C; the temperature from 0.6-1.2 m is set to 260-280°C, and the vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m and 1.2 m are 0.8 L / min, 0.5 L / min and 0.5 L / min, respectively; the temperature from 1.2-1.5 m is set to 280-260°C.

[0101] d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 70% fiber prepreg tape with a width of 300 mm and a thickness of 0.05 mm is prepared.

[0102] Example 3

[0103] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0104] a. Raw material mixing step: 1000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-1), 2941 g of diamino-terminated nylon 12 oligomer (N-PA12-3), 39.8 g of decanedioic acid, 20 g of phosphoric acid, 20 g of a compounded antioxidant (an equal mass mixture of antioxidant 1098 and antioxidant 168), and 20 g of EBS were mixed in a high-speed mixer for 20 min to prepare a nylon 12 oligomer compound.

[0105] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) was melt-conveyed into a reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, at a rotational speed of 150 rpm, and with the temperature set to 180-200°C from the feeding section to the die head.

[0106] c. The nylon 12 melt conveyed from the twin-screw extruder was used to impregnate the continuous glass fibers (Tianjin Fibreglass, T984T2, with a single-fiber diameter of 4800 Tex) that had been spread in the reactive melt impregnation die. The temperature of the reactive impregnation die was set to 200-260°C at 0-0.6 m, 260-280°C at 0.6-1.2 m, and 280-260°C at 1.2-1.5 m. The vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m, and 1.2 m were 0.5 L / min, 0.5 L / min, and 0.5 L / min, respectively.

[0107] d. The melt-state prepreg tape was cooled, drawn, wound, cut, and then the continuous glass fiber-reinforced nylon 12 prepreg tape product was obtained. By adjusting the continuous fiber drawing rate and the twin-screw feeding rate, a 50% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm was prepared.

[0108] Example 4

[0109] The continuous fiber-reinforced nylon 12 prepreg tape was prepared according to the following method:

[0110] a. Raw material mixing step: 2000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), 1001 g of diamino-terminated nylon 12 oligomer (N-PA12-1), 10.8 g of adipic acid, 15 g of phosphoric acid, 15 g of a compounded antioxidant (an equal mass mixture of antioxidant 1098 and antioxidant 168), and 15 g of EBS were mixed in a high-speed mixer for 20 min to prepare a nylon 12 oligomer compound.

[0111] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) was melt-conveyed into a reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, at a rotational speed of 150 rpm, and with the temperature set to 180-200°C from the feeding section to the die head.

[0112] c. The nylon 12 melt delivered from the twin-screw extruder impregnates the continuous glass fiber (Taishan Fiberglass, T984T, filament diameter 2400 Tex) that has been spread in the reactive melt impregnation die. The temperature of the reactive impregnation die is set to 200-260°C at 0-0.6 m, 260-280°C at 0.6-1.2 m, and 280-260°C at 1.2-1.5 m. The vacuum pumping rate of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m, and 1.2 m is 0.5 L / min, 0.5 L / min, and 0.5 L / min, respectively.

[0113] d. The molten prepreg tape is cooled, drawn, wound, and cut to produce the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin-screw feeding rate, a 29% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm is prepared.

[0114] Example 5

[0115] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0116] a. Raw material mixing step: 1000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), 1000 g of diamino-terminated nylon 12 oligomer (N-PA12-2), 14.4 g of adipic acid, 10 g of phosphoric acid, 10 g of a compounded antioxidant (an equal mass mixture of antioxidant 1098 and antioxidant 168), and 10 g of EBS are mixed in a high-speed mixer for 20 min to produce a nylon 12 oligomer compound.

[0117] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melt-delivered into a reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, at a rotation speed of 150 rpm, and the temperature is set to 180-200°C from the feeding section to the die head.

[0118] c. The nylon 12 melt delivered from the twin-screw extruder impregnates the continuous glass fiber (Taishan Fiberglass, T984T, filament diameter 2400 Tex) that has been spread in the reactive melt impregnation die. The temperature of the reactive impregnation die is set to 200-260°C at 0-0.6 m, 260-280°C at 0.6-1.2 m, and 280-260°C at 1.2-1.5 m. The vacuum pumping rate of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m, and 1.2 m is 0.5 L / min, 0.5 L / min, and 0.5 L / min, respectively.

[0119] d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 50% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm is prepared.

[0120] Example 6

[0121] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0122] a. Raw material mixing step: 2000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-3), 1355 g of diamino-terminated nylon 12 oligomer (N-PA12-2), 12.1 g of adipic acid, 7 g of phosphoric acid, 17 g of complex antioxidant (equal mass mixture of antioxidant 1098 and antioxidant 168), and 17 g of EBS are mixed in a high-speed mixer for 20 min to obtain a nylon 12 oligomer compound.

[0123] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melt-transported into a reactive melt impregnation die using a twin screw extruder with a length-diameter ratio of 42, and the rotation speed is 150 rpm. The temperature from the feeding section to the die head is set to 180-200°C.

[0124] c. The nylon 12 melt transported from the twin screw extruder completes the impregnation of the spread continuous glass fiber (Taishan Glass Fiber, T984T, single filament diameter 2400 Tex) in the reactive melt impregnation die. Among them, the temperature of the reactive impregnation die from 0-0.6 m is set to 200-260°C; the temperature from 0.6-1.2 m is set to 260-280°C, and the vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m and 1.2 m are 0.5 L / min, 0.5 L / min and 0.5 L / min, respectively; the temperature from 1.2-1.5 m is set to 280-260°C.

[0125] d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 50% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm is prepared.

[0126] Example 7

[0127] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0128] a. Raw material mixing step: 1000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-3), 998 g of diamino-terminated nylon 12 oligomer (N-PA12-3), 9.6 g of adipic acid, 4 g of phosphoric acid, 10 g of compounded antioxidant (an equal mass mixture of antioxidant 1098 and antioxidant 168), and 10 g of EBS were mixed in a high-speed mixer for 20 min to prepare a nylon 12 oligomer compound.

[0129] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) was melt-conveyed into a reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, at a rotational speed of 200 rpm, and with the temperature set to 180-200°C from the feeding section to the die head.

[0130] c. The nylon 12 melt conveyed from the twin-screw extruder was used to impregnate the continuous glass fibers (Tianjin Fibreglass, T984T, with a single-filament diameter of 2400 Tex) that had been spread in the reactive melt impregnation die. The temperature was set to 200-260°C at 0-0.6 m, 260-280°C at 0.6-1.2 m, and 280-260°C at 1.2-1.5 m. The vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6 m, 0.9 m, and 1.2 m were 0.5 L / min, 0.5 L / min, and 0.5 L / min, respectively.

[0131] d. The melt-state prepreg tape was cooled, drawn, wound, and cut to obtain a continuous glass fiber-reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin-screw feeding rate, a 50% fiber prepreg tape with a width of 800 mm and a thickness of 0.2 mm was prepared.

[0132] Comparative Example 1

[0133] A continuous fiber-reinforced nylon 12 prepreg tape was prepared according to the following method:

[0134] a. Raw material mixing step: 1000 g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), 1000 g of diamino-terminated nylon 12 oligomer (N-PA12-2), 36 g of adipic acid, 10 g of phosphoric acid, 10 g of compounded antioxidant (an equal mass mixture of antioxidant 1098 and antioxidant 168), and 10 g of EBS were mixed in a high-speed mixer for 20 min to prepare a nylon 12 oligomer compound.

[0135] b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) was melt-conveyed into a reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, at a rotational speed of 150 rpm, and with the temperature set to 180-200°C from the feeding section to the die head.

[0136] c. The nylon 12 melt delivered from the twin-screw extruder completes impregnation on the spreaded continuous glass fiber (Taishan Fiberglass, T984T, single filament diameter of 2400 Tex) in the reactive melt impregnation die. Among them, the temperature of the reactive impregnation die is set to 200-260°C at 0-0.6m, 260-280°C at 0.6-1.2m, and 280-260°C at 1.2-1.5m. The vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6m, 0.9m and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively.

[0137] d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin-screw feeding rate, a 50% fiber prepreg tape with a width of 500mm and a thickness of 0.1mm is prepared.

[0138] Comparative Example 2

[0139] The continuous fiber reinforced nylon 12 prepreg tape is prepared according to the following method:

[0140] a. Raw material mixing step: 1000g of dicarboxyl-terminated nylon 12 oligomer (C-PA12-2), 1000g of diamino-terminated nylon 12 oligomer (N-PA12-2), 5.5g of adipic acid, 10g of phosphoric acid, 10g of compound antioxidant (equal mass compound of antioxidant 1098 and antioxidant 168), and 10g of EBS are mixed in a high-speed mixer for 20min to prepare a nylon 12 oligomer compound.

[0141] b. Reactive melt impregnation step: the nylon 12 oligomer compound prepared in step (1) is melt delivered into the reactive melt impregnation die using a twin-screw extruder with a length-diameter ratio of 42, and the rotation speed is 150rpm. The temperature is set to 180-200°C from the feeding section to the die head.

[0142] c. The nylon 12 melt delivered from the twin-screw extruder completes impregnation on the spreaded continuous glass fiber (Taishan Fiberglass, T984T, single filament diameter of 2400 Tex) in the reactive melt impregnation die. Among them, the temperature of the reactive impregnation die is set to 200-260°C at 0-0.6m, 260-280°C at 0.6-1.2m, and 280-260°C at 1.2-1.5m. The vacuum pumping rates of the three sets of vacuum exhaust systems at 0.6m, 0.9m and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively.

[0143] d. The molten prepreg tape was cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 50% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm was prepared.

[0144] Comparative Example 3

[0145] The continuous fiber reinforced nylon 12 prepreg tape was prepared according to the following method:

[0146] a. Raw material mixing step: 2000 g of high molecular weight nylon 12 (PA12-1'), 10 g of compounded antioxidant (an equal mass compound of antioxidant 1098 and antioxidant 168), and 10 g of EBS were mixed in a high-speed mixer for 20 min to obtain a nylon 12 oligomer compound.

[0147] b. Reactive melt impregnation step: the nylon 12 oligomer compound prepared in step (1) was melt transported into a reactive melt impregnation die using a twin screw extruder with a length-diameter ratio of 42, and the rotation speed was 150 rpm. The temperature from the feeding section to the die head was set to 180-200°C.

[0148] c. The nylon 12 melt transported from the twin screw extruder completed the impregnation of the spread continuous glass fiber (Taishan Glass Fiber, T984T, single filament diameter 2400 Tex) in the reactive melt impregnation die. Among them, the temperature of the reactive impregnation die 0-0.6 m was set to 200-260°C; the temperature of 0.6-1.2 m was set to 260-280°C, and the three sets of vacuum exhaust systems at 0.6 m, 0.9 m and 1.2 m were all closed; the temperature of 1.2-1.5 m was set to 280-260°C.

[0149] d. The molten prepreg tape was cooled, drawn, wound, and cut to obtain the continuous glass fiber reinforced nylon 12 prepreg tape product. By adjusting the continuous fiber drawing rate and the twin screw feeding rate, a 50% fiber prepreg tape with a width of 500 mm and a thickness of 0.1 mm was prepared.

[0150] The continuous fiber reinforced nylon 12 prepreg tapes prepared in each example and comparative example were cut and laid according to 0-90-0°, and a hot press was used to form a continuous fiber reinforced nylon laminate. Then, a sample cutter was used to cut standard samples on the laminate for tensile strength, bending modulus, and room temperature Charpy notched impact strength tests. A muffle furnace was used for fiber content testing, and GPC was used for nylon 12 molecular weight testing of the continuous fiber reinforced nylon 12 prepreg tape. The test results are shown in Table 1:

[0151] Table 1, Test results of each index of continuous fiber reinforced nylon 12 prepreg tape

[0152]

[0153] As can be seen from the performance test data of the examples and comparative examples in Table 1, the continuous fiber reinforced nylon 12 prepreg tape prepared by impregnating continuous glass fibers with the double carboxyl-terminated nylon 12 oligomer and the double amino-terminated nylon 12 oligomer having lower viscosity and better wettability has better mechanical properties.

[0154] The above description is only preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the method of the present application, a number of improvements and supplements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 1000g of dicarboxylated end-capped nylon 12 oligomer, 999g of diamino end-capped nylon 12 oligomer, 18g of adipic acid, 16g of phosphoric acid, 10g of an equal mass compound of antioxidant 1098 and antioxidant 168, and 10g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 60 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.8L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

2. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 1000g of dicarboxylated end-capped nylon 12 oligomer, 1996g of diamino end-capped nylon 12 oligomer, 21.5g of adipic acid, 15g of phosphoric acid, 15g of an equal mass mixture of antioxidant 1098 and antioxidant 168, and 15g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 120 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.8L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

3. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 1000g of dicarboxylated end-capped nylon 12 oligomer, 2941g of diamino end-capped nylon 12 oligomer, 39.8g of sebacic acid, 20g of phosphoric acid, 20g of an equal mass compound of antioxidant 1098 and antioxidant 168, and 20g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 150 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

4. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 2000g of dicarboxylated end-capped nylon 12 oligomer, 1001g of diamino end-capped nylon 12 oligomer, 10.8g of adipic acid, 15g of phosphoric acid, 15g of an equal mass mixture of antioxidant 1098 and antioxidant 168, and 15g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 150 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

5. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 1000g of dicarboxylated end-capped nylon 12 oligomer, 1000g of diamino end-capped nylon 12 oligomer, 14.4g of adipic acid, 10g of phosphoric acid, 10g of an equal mass mixture of antioxidant 1098 and antioxidant 168, and 10g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 150 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

6. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 2000g of dicarboxylated end-capped nylon 12 oligomer, 1355g of diamino end-capped nylon 12 oligomer, 12.1g of adipic acid, 7g of phosphoric acid, 17g of an equal mass mixture of antioxidant 1098 and antioxidant 168, and 17g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 150 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

7. A method for preparing a continuous glass fiber reinforced nylon 12 prepreg tape, comprising the following steps: a. Raw material mixing step: 1000g of dicarboxylated end-capped nylon 12 oligomer, 998g of diamino end-capped nylon 12 oligomer, 9.6g of adipic acid, 4g of phosphoric acid, 10g of an equal mass mixture of antioxidant 1098 and antioxidant 168, and 10g of EBS are added to a high-speed mixer and mixed for 20 minutes to obtain nylon 12 oligomer compound; b. Reactive melt impregnation step: The nylon 12 oligomer compound prepared in step (1) is melted and fed into the reactive melt impregnation mold using a twin-screw extruder with a length-to-diameter ratio of 42. The speed is 200 rpm, and the temperature from the feeding section to the die head is set to 180-200℃. c. Nylon 12 melt, fed from a twin-screw extruder, impregnates the spread continuous glass fibers in a reactive melt impregnation die; wherein... The temperature of the reactive impregnation mold is set to 200-260℃ for 0-0.6m; 260-280℃ for 0.6-1.2m; and the vacuum evacuation rates of the three vacuum degassing systems at 0.6m, 0.9m, and 1.2m are 0.5L / min, 0.5L / min, and 0.5L / min, respectively; the temperature is set to 280-260℃ for 1.2-1.5m. d. The molten prepreg tape is cooled, drawn, wound, and cut to obtain the finished product of continuous glass fiber reinforced nylon 12 prepreg tape.

8. The method for preparing continuous glass fiber reinforced nylon 12 prepreg tape according to any one of claims 1-7, characterized in that, The dicarboxyl-terminated nylon 12 oligomer has a molecular weight of 1000-3000 and a terminal carboxyl content of 0.65-2.0 mmol / g; and / or, the diamino-terminated nylon 12 oligomer has a molecular weight of 1000-3000 and a terminal amino content of 0.65-2.0 mmol / g.

9. The method for preparing continuous glass fiber reinforced nylon 12 prepreg tape according to any one of claims 1-7, characterized in that, The dicarboxyl-terminated nylon 12 oligomer has a molecular weight of 1800-2200 and a terminal carboxyl content of 0.90-1.10 mmol / g; and / or, the diamino-terminated nylon 12 oligomer has a molecular weight of 1800-2200 and a terminal amino content of 0.90-1.10 mmol / g.

10. The method for preparing continuous glass fiber reinforced nylon 12 prepreg tape as described in claim 1, characterized in that, The continuous glass fiber is an untwisted coarse grit that has undergone surface modification treatment with a coupling agent, and the diameter of the continuous glass fiber monofilament is 2400Tex or 4800Tex.

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