CN109734898B - P-N-Si synergistic flame-retardant copolyamide 6 and preparation method thereof - Google Patents
P-N-Si synergistic flame-retardant copolyamide 6 and preparation method thereof Download PDFInfo
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Abstract
The invention discloses novel P-N-Si synergistic flame-retardant copolymerized polyamide 6 and a preparation method thereof. The preparation method of the P-N-Si synergistic flame-retardant copolymerized polyamide 6 comprises the following steps: adding a phosphorus-containing flame retardant prepolymer, a nitrogen-containing flame retardant and a silicon-containing flame retardant in the polymerization process of polyamide 6 to obtain P-N-Si synergistic flame-retardant copolymerized polyamide 6; the phosphorus-containing flame retardant prepolymer is obtained by sequentially carrying out salt forming reaction and prepolymerization reaction on a phosphorus-containing flame retardant and diamine. The P-N-Si synergistic copolymerization flame-retardant copolyamide 6 is prepared by adopting a P-N-S-i synergistic flame-retardant system, reacting BCPPO derivative flame-retardant prepolymer, melamine cyanurate, a silicon-containing flame retardant and caprolactam through copolymerization. Due to the synergistic effect, the flame retardant has high flame retardant efficiency, and in addition, the flame retardant material obtained by the copolymerization method ensures the molecular weight, the mechanical property and the like of the material.
Description
Technical Field
The invention relates to P-N-Si synergistic flame-retardant copolyamide 6 and a preparation method thereof, belonging to the field of flame-retardant materials.
Background
Polyamide (nylon) is engineering plastic with the largest dosage and the widest application, polyamide 6 is one of the most important nylon varieties, has the advantages of large dosage, wide application, excellent comprehensive performance, excellent mechanical property, wear resistance, self-lubricating property and corrosion resistance, can face a harsher use environment, and is commonly used as fiber materials, engineering plastics and the like. The polyamide 6 has low limit oxygen index and unsatisfactory flame retardant effect, and has very important significance in improving the flame retardant property.
At present, there are three types of methods for flame retardant modification of polymer materials: firstly, adding a flame retardant for blending, and strongly dispersing and mixing polyamide 6 and the flame retardant by using a double screw during extrusion granulation to realize flame retardant modification, wherein the flame retardant is wide in application range and convenient to operate, but a large amount of flame retardant is required to realize a good flame retardant effect, so that the mechanical properties of the material are influenced; secondly, a reactive flame retardant is used, a reactive flame retardant monomer is added for copolymerization during the polymerization of polyamide 6, the flame retardant is directly introduced into a nylon molecular chain, flame retardance can be achieved by adding a small amount of the flame retardant, and the problems of emigration and dispersion of the flame retardant can not occur, but the types of the suitable reactive flame retardant are few, the processing technology is complex, and the cost is high; thirdly, after flame-retardant post-treatment, the polyamide 6 fabric can be combined with the flame retardant and the fabric through the flame-retardant post-treatment, namely grafting, rolling, baking, spraying, coating and the like, so that flame retardance is achieved.
The copolymerization flame retardation by using the reactive flame retardant is an important method for nylon flame retardation modification, and the flame retardant is introduced into molecules, so that the product has an essential flame retardation effect, and the flame retardation performance is long-term and effective. However, the polymerization temperature of nylon is higher, and firstly, a proper reactive flame retardant is selected, and the reactive flame retardant is not decomposed at the polymerization temperature; secondly, no end capping can occur with flame retardants as comonomers, otherwise the molecular weight of the polymer will be greatly affected. Therefore, it is required to provide a novel synergistic flame-retardant copolymerized polyamide, which enables the polymer to have excellent flame retardance and mechanical properties.
Disclosure of Invention
The invention aims to provide P-N-Si synergistic flame-retardant copolyamide 6 and a preparation method thereof, wherein the P-N-Si synergistic flame-retardant copolyamide 6 with excellent performance is prepared by polymerizing a BCPPO derivative flame retardant prepolymer, melamine cyanurate, a silicon-containing flame retardant and polyamide 6 salt together.
The preparation method of the P-N-Si synergistic flame-retardant copolymerized polyamide 6 provided by the invention comprises the following steps:
and adding a phosphorus-containing flame retardant prepolymer, a nitrogen-containing flame retardant and a silicon-containing flame retardant in the polymerization process of the polyamide 6 to obtain the P-N-Si synergistic flame-retardant copolymerized polyamide 6.
In the preparation method, the phosphorus-containing flame retardant prepolymer is obtained by sequentially carrying out salt forming reaction and prepolymerization reaction on a phosphorus-containing flame retardant and diamine;
the molecular weight of the phosphorus-containing flame-retardant prepolymer is 1000-5000.
In the preparation method, the temperature of the salt forming reaction is 60-80 ℃, and the time is 0.5-1.5 h;
the prepolymerization reaction is carried out at the temperature of 150-170 ℃, the pressure of 0.2-0.3 MPa and the time of 0.5-1 h.
In the above preparation method, the diamine is at least one of ethylenediamine, propylenediamine, hexamethylenediamine, decyldiamine, undecylenediamine and dodecyldiamine;
the structural formula of the phosphorus-containing flame retardant is shown as a formula I, namely the phosphorus-containing flame retardant is a BCPPO derivative:
in the formula I, R represents C1-C3 linear alkyl, unsaturated linear, branched or cyclic C3-C10 alkylene or a benzene-containing group, preferably a benzene-containing group, such as C1-C10 straight-chain alkyl substituted phenyl or C1-C7 straight-chain alkyl substituted phenyl, and specifically can be methyl phenyl, ethyl phenyl, propenyl phenyl, butyl phenyl or n-heptyl phenyl;
the molar ratio of the phosphorus-containing flame retardant to the diamine may be 1: 1 to 1.2.
In the preparation method, the nitrogen-containing flame retardant can be melamine cyanurate;
the structural formula of the silicon-containing flame retardant is shown as a formula II or a formula III:
in the formula II or III, R1、R2And R3All represent C1-C10 saturated or unsaturated straight chain, branched chain or cyclic C3-C10 alkylene or benzene-containing group;
R3preferably a saturated or unsaturated linear alkylene group having from C1 to C3, such as methylene or propylene;
R1preferably a saturated or unsaturated linear alkylene group of C1 to C3, such as methylene, ethylene or propylene;
R2saturated or unsaturated, linear alkylene radicals having from C1 to C7, such as methylene, butylene or heptylene, are preferred.
In the above preparation method, the polymerization process of the polyamide 6 is as follows:
1) mixing caprolactam, a catalyst, an antioxidant and water, and then carrying out heat preservation at the temperature of 160-200 ℃ and the pressure of 0.6-0.8 Mpa;
2) after the pressure is relieved to normal pressure, adding the phosphorus-containing flame retardant prepolymer, the nitrogen-containing flame retardant and the silicon-containing flame retardant, heating to 235-260 ℃, and then carrying out polymerization reaction to obtain the P-N-Si synergistic flame-retardant copolymerized polyamide 6;
the polymerization reaction is carried out under vacuum conditions.
In the preparation method, the mass ratio of the raw materials is as follows: 100 parts of caprolactam, 0.1-1 part of catalyst, 0.1-1 part of antioxidant, 5-10 parts of water, 0.1-10 parts of phosphorus-containing flame-retardant prepolymer, 0.1-10 parts of nitrogen-containing flame retardant and 0.1-10 parts of silicon-containing flame retardant; specifically, any one of the following 1) to 7) may be used:
1) 100 parts of caprolactam, 0.1-0.5 part of catalyst, 0.1-0.9 part of antioxidant, 5-8 parts of water, 0.1-8 parts of phosphorus-containing flame-retardant prepolymer, 0.1-4 parts of nitrogen-containing flame retardant and 0.1-6 parts of silicon-containing flame retardant;
2) 100 parts of caprolactam, 0.5-1 part of catalyst, 0.9-1 part of antioxidant, 8-10 parts of water, 8-10 parts of phosphorus-containing flame-retardant prepolymer, 4-10 parts of nitrogen-containing flame retardant and 6-10 parts of silicon-containing flame retardant;
3) 100 parts of caprolactam, 0.1 part of catalyst, 0.9 part of antioxidant, 5 parts of water, 3 parts of phosphorus-containing flame-retardant prepolymer, 3 parts of nitrogen-containing flame retardant and 6 parts of silicon-containing flame retardant;
4) 100 parts of caprolactam, 1 part of catalyst, 0.8 part of antioxidant, 10 parts of water, 8 parts of phosphorus-containing flame-retardant prepolymer, 0.1 part of nitrogen-containing flame retardant and 10 parts of silicon-containing flame retardant;
5) 100 parts of caprolactam, 0.5 part of catalyst, 0.1 part of antioxidant, 8 parts of water, 0.1 part of phosphorus-containing flame-retardant prepolymer, 10 parts of nitrogen-containing flame retardant and 5 parts of silicon-containing flame retardant;
6) 100 parts of caprolactam, 0.1 part of catalyst, 1 part of antioxidant, 10 parts of water, 10 parts of phosphorus-containing flame-retardant prepolymer, 10 parts of nitrogen-containing flame retardant and 0.1 part of silicon-containing flame retardant;
7) 100 parts of caprolactam, 1 part of catalyst, 0.5 part of antioxidant, 5 parts of water, 4 parts of phosphorus-containing flame-retardant prepolymer, 4 parts of nitrogen-containing flame retardant and 10 parts of silicon-containing flame retardant.
In the above preparation method, in step 1), before the heat preservation, the method further includes the following steps: mixing the caprolactam, the catalyst, the antioxidant and the water in a reaction kettle, then filling nitrogen into the reaction kettle, vacuumizing, and repeating for 3-6 times to discharge air; and after completely removing the air, filling nitrogen to keep the pressure in the kettle at 0.1-0.2 MPa.
In the preparation method, in the step 1), the heat preservation time can be 1-2 h;
in the step 2), the time of the polymerization reaction can be 30-50 min;
the vacuum degree under the vacuum condition can be 0.01-0.05 KPa.
In the preparation method, the antioxidant can be antioxidant 1010, antioxidant 1098 or antioxidant 1076 and the like;
the catalyst may be the sodium or potassium salts of the following acids: phosphoric acid, phosphorous acid and hypophosphorous acid;
and 2), filling nitrogen into the kettle after the polymerization reaction, opening a lower discharge hole, and cooling and granulating the melt to obtain the flame-retardant copolyamide 6 slice.
The flame-retardant copolyamide 6 prepared by the invention is added with the silicon-containing flame retardant on the basis of N-P synergistic effect, has good flame-retardant effect and melt-drip resistance, and can be prepared into flame-retardant synthetic fibers, woven fabrics or directly used as flame-retardant engineering plastics.
The P-N-Si synergistic copolymerization flame-retardant copolyamide 6 is prepared by adopting a P-N-S-i synergistic flame-retardant system, reacting BCPPO derivative flame-retardant prepolymer, melamine cyanurate, a silicon-containing flame retardant and caprolactam through copolymerization. Due to the synergistic effect, the flame retardant has high flame retardant efficiency, and in addition, the flame retardant material obtained by the copolymerization method ensures the molecular weight, the mechanical property and the like of the material.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The parts in the following examples are all parts by mass.
Example 1P-N-Si synergistic copolymerization flame retardant copolyamide 6
1. Adding bis (4-carboxyphenyl) phenyl ethyl phosphine oxide (R in formula I is ethyl benzene) and hexamethylene diamine into a reactor, wherein the molar ratio is 1: 1.2, stirring for 1.5h at 60 ℃ to completely mix. Then adjusting the pressure to 0.2MPa, raising the temperature to 170 ℃, and carrying out prepolymerization for 1 h. And cooling to room temperature, carrying out suction filtration, and washing with deionized water to obtain the phosphorus-containing flame-retardant prepolymer with the molecular weight of 5000.
2. Adding 5 parts of deionized water, 100 parts of caprolactam, 1 part of catalyst sodium hypophosphite and 0.5 part of antioxidant 1098 into a reaction kettle, repeatedly vacuumizing and filling nitrogen for 6 times, removing air in the kettle, and filling nitrogen to ensure that the pressure in the kettle is 0.2 MPa. Heating the reaction kettle, simultaneously starting stirring, heating to 200 ℃, keeping the pressure at 0.8MPa for 1 h. Slowly adjusting the pressure in the kettle to normal pressure, adding 4 parts of melamine cyanurate, 4 parts of phosphorus-containing flame-retardant prepolymer and 10 parts of methylaminodimethylsilyloxy octanoic acid (R in formula III)1Is methylene, R2Heptyl) is added, the temperature is increased to 235 ℃, then the vacuum is pumped to 0.01KPa, and the pumping is carried out for 30 min. And (3) filling nitrogen into the kettle, opening a lower discharge hole, cooling, granulating and drying the melt to obtain the flame-retardant copolyamide 6 slice.
Example 2P-N-Si synergistic copolymerization flame retardant copolyamide 6
1. Adding bis (4-carboxyphenyl) phenyl propenyl phosphine oxide (R in formula I is propenyl benzene) and deca diamine into a reactor, wherein the molar ratio is 1: 1.1, stirring for 0.5h at 80 ℃ to completely mix. Then adjusting the pressure to 0.2MPa, raising the temperature to 170 ℃, and carrying out prepolymerization for 1 h. And cooling to room temperature, carrying out suction filtration, and washing with deionized water to obtain the phosphorus-containing flame-retardant prepolymer, wherein the molecular weight of the prepolymer is 1000.
2. Adding 10 parts of deionized water, 100 parts of caprolactam, 0.1 part of catalyst potassium phosphite and 1 part of antioxidant 1076 into a reaction kettle, repeatedly vacuumizing and filling nitrogen for 3 times, removing air in the kettle completely, and keeping the pressure in the kettle at 0.1 MPa. Heating the reaction kettle, simultaneously stirring, heating to 160 ℃, keeping the pressure at 0.6MPa for 2 hours. Slowly adjusting the pressure in the kettle to normal pressure, adding 10 parts of melamine cyanurate, 10 parts of phosphorus-containing flame-retardant prepolymer and 0.1 part of propenyl amino dimethyl silicon oxy valeric acid (R in formula III)1Is propylene, R2Butylene), heating to 260 ℃, then vacuumizing to 0.05KPa, and pumping for 50 min. And (3) filling nitrogen into the kettle, opening a lower discharge hole, cooling, granulating and drying the melt to obtain the flame-retardant copolyamide 6 slice.
Example 3P-N-Si synergistic copolymerization flame retardant copolyamide 6
1. Adding bis (4-carboxyphenyl) phenyl butane phosphine oxide (R in formula I is butyl benzene) and hexamethylene diamine into a reactor, wherein the molar ratio is 1: 1.15, stirring at 70 ℃ for 1h to mix thoroughly. Then adjusting the pressure to 0.2MPa, raising the temperature to 170 ℃, and carrying out prepolymerization for 1 h. And cooling to room temperature, carrying out suction filtration, and washing with deionized water to obtain the phosphorus-containing flame-retardant prepolymer, wherein the molecular weight of the prepolymer is 3500.
2. Adding 8 parts of deionized water, 100 parts of caprolactam, 0.5 part of catalyst sodium phosphate and 0.1 part of antioxidant 1010 into a reaction kettle, repeatedly vacuumizing and filling nitrogen for 5 times, removing air in the kettle, and keeping the pressure in the kettle at 0.15 MPa; heating the reaction kettle, simultaneously starting stirring, heating to 180 ℃, keeping the pressure at 0.7MPa for 1 h. Slowly adjusting the pressure in the kettle to normal pressure, adding 10 parts of melamine cyanurate, 0.1 part of phosphorus-containing flame-retardant prepolymer and 5 parts of propenyl amino dimethyl silanol (R in formula II)3Propylene group) at 255 deg.C, vacuumizing to 0.03KPa, and pumping for 40 min. And (3) filling nitrogen into the kettle, opening a lower discharge hole, cooling, granulating and drying the melt to obtain the flame-retardant copolyamide 6 slice.
Example 4P-N-Si synergistic copolymerization flame retardant copolyamide 6
1. Bis (4-carboxyphenyl) phenylmethylphosphine oxide (R in formula I is methylbenzene) and dodecanediamine are added to the reactor in a molar ratio of 1: 1.1, stirring at 60 ℃ for 1.2h to completely mix. Then adjusting the pressure to 0.2MPa, raising the temperature to 170 ℃, and carrying out prepolymerization for 1 h. After the temperature is reduced to room temperature, the mixture is filtered and washed by deionized water, and the phosphorus-containing flame-retardant prepolymer with the molecular weight of 4500 is obtained.
2. Adding 10 parts of deionized water, 100 parts of caprolactam, 1 part of catalyst potassium phosphite and 0.8 part of antioxidant 1010 into a reaction kettle, repeatedly vacuumizing and filling nitrogen for 4 times, removing air in the kettle completely, and filling nitrogen to ensure that the pressure in the kettle is 0.2 MPa. Heating the reaction kettle, simultaneously stirring, heating to 190 ℃, keeping the pressure at 0.8MPa for 1 h. Slowly adjusting the pressure in the kettle to normal pressure, adding 0.1 part of melamine cyanurate, 8 parts of phosphorus-containing flame-retardant prepolymer and 10 parts of ethyl amino dimethyl silicon oxide acetic acid (R in formula III)1Is ethylene, R2Methylene) is adopted, the temperature is increased to 245 ℃, then the vacuum is pumped to 0.03KPa, and the pumping is carried out for 40 min; and (3) filling nitrogen into the kettle, opening a lower discharge hole, cooling, granulating and drying the melt to obtain the flame-retardant copolyamide 6 slice.
Example 5P-N-Si synergistic copolymerization flame retardant copolyamide 6
1. Adding bis (4-carboxyphenyl) phenyl heptane phosphine oxide (R in formula I is n-heptylbenzene) and propylene diamine into a reactor at a molar ratio of 1: 1.1, stirring at 70 ℃ for 1h to allow complete mixing. Then adjusting the pressure to 0.2MPa, raising the temperature to 170 ℃, and carrying out prepolymerization for 1 h. And cooling to room temperature, carrying out suction filtration, and washing with deionized water to obtain the phosphorus-containing flame-retardant prepolymer with the molecular weight of 4000.
2. Adding 5 parts of deionized water, 100 parts of caprolactam, 0.1 part of catalyst sodium hypophosphite and 0.9 part of antioxidant 1010 into a reaction kettle, repeatedly vacuumizing and filling nitrogen for 3 times, removing air in the kettle, and filling nitrogen to ensure that the pressure in the kettle is 0.15 MPa. Heating the reaction kettle, simultaneously stirring, heating to 180 ℃, keeping the pressure at 0.8MPa for 1 h. Slowly adjusting the pressure in the kettle to normal pressure, adding 3 parts of melamine cyanurate, 3 parts of phosphorus-containing flame-retardant prepolymer and 6 parts of methyl amino dimethyl silanol (R in formula II)3Methylene) is adopted, the temperature is increased to 260 ℃, then the vacuum is pumped to 0.03KPa, and the pumping is carried out for 40 min; to the kettleAnd (3) introducing nitrogen, opening a discharge hole, cooling, granulating and drying the melt to obtain the flame-retardant copolyamide 6 slice.
The flame retardant property of the copolymerized flame retardant polyamide resin obtained in each of the above examples was tested
I. Preparation of the samples
Test specimens made of the polyamide resin containing no flame retardant were referred to as "PA", and test specimens made of the flame-retardant polyamide resins obtained in examples 1 to 5 above were referred to as FR-1, FR-2, FR-3, FR-4 and FR-5, respectively. The test specimen preparation procedure for all the above-mentioned specimens is referred to GB/T9352- & 2008 "compression Molding of Plastic thermoplastic Material specimens".
II. Limiting Oxygen Index (LOI) test
The limit oxygen index test refers to the GB/T2406.2-2009 combustion behavior determination by oxygen index method for plastics standard, and the limit oxygen index is determined by an HC-2CZ type limit oxygen index determinator at room temperature. Spline specification: 130mm × 6.5mm × 3.0mm, by top-firing.
III, vertical Combustion (UL-94) test
TABLE 1 GB/T2408-2008 test grade control Standard
The vertical combustion test is carried out at room temperature by adopting an CZF-2 type vertical combustion tester according to the standard of GB/T2408-2008 'horizontal method and vertical method for testing the combustion performance of plastics'. Spline specification: 130 mm. times.13 mm. times.3.0 mm. The sample strip is vertically fixed on the sample clamp, the part clamped at the upper end is 6mm, the distance between the lower end of the sample strip and absorbent cotton (6mm thick) is 300mm, a bunsen burner (flame height is 20mm, blue flame) is used at a position 150mm away from the bottom end of the sample strip, the sample is moved away after flame is applied for 10s, and the test data of the sample strip is recorded. After the specimen is extinguished, the specimen is ignited again according to the method, and the test data are respectively recorded. Table 1 is a test result rating comparison standard.
IV, flame retardant Property test results
The limiting oxygen index and the results of the vertical burn test are shown in table 2.
TABLE 2 flame retardancy test results
| Sample (I) | LOI(％) | UL-94 rating |
| PA | 23.0 | V-2 |
| FR-1 | 27.8 | V-1 |
| FR-2 | 29.3 | V-0 |
| FR-3 | 28.1 | V-0 |
| FR-4 | 29.2 | V-0 |
| FR-5 | 28.6 | V-0 |
From the results in Table 2, it can be seen that the copolymerized polyamide has excellent flame retardancy, the limiting oxygen index LOI is about 28%, which is greatly improved compared with the polyamide resin without flame retardant processing, and all the chips reach the level of UL-94V-1 or above.
The mechanical properties of the flame-retardant copolyamide 6 chips prepared in examples 1 to 5 are shown in Table 3.
From the results in table 3, it can be seen that the addition of the flame retardant has little influence on the performance preparation of the slice, which indicates that the addition of the P-N-Si synergistic flame retardant not only ensures various mechanical properties of the flame-retardant polyamide, but also greatly improves the flame retardance, indicating that the P-N-Si has good synergy.
TABLE 3 flame retardant Nylon 6 chip Performance index
Claims (7)
1. A preparation method of P-N-Si synergistic flame-retardant copolymerized polyamide 6 comprises the following steps:
adding a phosphorus-containing flame retardant prepolymer, a nitrogen-containing flame retardant and a silicon-containing flame retardant in the polymerization process of polyamide 6 to obtain the P-N-Si synergistic flame-retardant copolymerized polyamide 6;
the phosphorus-containing flame retardant prepolymer is obtained by sequentially carrying out salt forming reaction and prepolymerization reaction on a phosphorus-containing flame retardant and diamine;
the diamine is at least one of ethylenediamine, propylenediamine, hexamethylenediamine, decamethylenediamine, undecanediamine and dodecanediamine;
the structural formula of the phosphorus-containing flame retardant is shown as the formula I:
in the formula I, R represents phenyl substituted by C1-C10 straight-chain alkyl;
the molar ratio of the phosphorus-containing flame retardant to the diamine is 1: 1 to 1.2;
the nitrogen-containing flame retardant is melamine cyanurate;
the structural formula of the silicon-containing flame retardant is shown as a formula II or a formula III:
in the formula II or III, R1、R2And R3All represent C1-C10 saturated or unsaturated straight chain, branched chain or cyclic C3-C10 alkylene or benzene-containing group.
2. The method of claim 1, wherein: the temperature of the salt forming reaction is 60-80 ℃, and the time is 0.5-1.5 h;
the prepolymerization reaction is carried out at the temperature of 150-170 ℃, the pressure of 0.2-0.3 MPa and the time of 0.5-1 h.
3. The production method according to claim 1 or 2, characterized in that: the polymerization process of the P-N-Si synergistic flame-retardant copolymerized polyamide 6 is as follows:
1) mixing caprolactam, a catalyst, an antioxidant and water, and then carrying out heat preservation at the temperature of 160-200 ℃ and the pressure of 0.6-0.8 Mpa;
2) after the pressure is relieved to normal pressure, adding the phosphorus-containing flame retardant prepolymer, the nitrogen-containing flame retardant and the silicon-containing flame retardant, heating to 235-260 ℃, and then carrying out polymerization reaction to obtain the P-N-Si synergistic flame-retardant copolymerized polyamide 6;
the polymerization reaction is carried out under vacuum conditions.
4. The production method according to claim 3, characterized in that: the mass ratio of the raw materials is as follows: 100 parts of caprolactam, 0.1-1 part of catalyst, 0.1-1 part of antioxidant, 5-10 parts of water, 0.1-10 parts of phosphorus-containing flame-retardant prepolymer, 0.1-10 parts of nitrogen-containing flame retardant and 0.1-10 parts of silicon-containing flame retardant.
5. The method of claim 4, wherein: in the step 1), the heat preservation time is 1-2 h;
in the step 2), the time of the polymerization reaction is 30-50 min;
the vacuum degree under the vacuum condition is 0.01-0.05 KPa.
6. The method of claim 5, wherein: the antioxidant is antioxidant 1010, antioxidant 1098 or antioxidant 1076;
the catalyst is sodium salt or potassium salt of the following acid: phosphoric acid, phosphorous acid and hypophosphorous acid.
7. P-N-Si synergistic flame retardant copolyamide 6 prepared by the process according to any one of claims 1-6.
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