CN113980460A - Composite material for recycling waste nylon and preparation method thereof - Google Patents
Composite material for recycling waste nylon and preparation method thereof Download PDFInfo
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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Abstract
The invention discloses a composite material for recycling waste nylon and a preparation method thereof, wherein the composite material is prepared from the following components in parts by weight: 45-70 parts of waste nylon, preferably 50-60 parts; 12-30 parts of microencapsulated flame retardant, preferably 16-24 parts; 20-40 parts of hollow glass beads, preferably 25-35 parts; 1-3 parts of assistant, preferably 1.5-2.5 parts; the microencapsulated flame retardant has a microencapsulated structure with the flame retardant as an inner core and the epoxy silane oligomer MP200 as a coating shell. The composite material has excellent mechanical property and flame retardant property, and has the advantage of light weight.
Description
Technical Field
The invention relates to a composite material and a preparation method thereof, in particular to a composite material for recycling waste nylon and a preparation method thereof.
Background
The long-chain nylon has irreplaceable effects in the fields of cooling pipes, industrial pipelines, gas pipelines and the like due to low density, good low-temperature toughness, low water absorption, stable size, excellent solvent resistance and the like. In addition, the material has excellent electrical property and has good application prospect in the fields of electronic appliances, intelligent wearing, new energy automobiles, photovoltaic and the like.
In recent years, environmental-friendly and low-carbon green new materials are advocated and promoted in all countries in the world, and all large enterprises actively respond to government calls to carry out secondary recycling on the materials, so that long-chain nylon as a material with high cost and excellent performance is more necessary to participate. However, long chain nylon (referred to herein as "waste nylon") that has undergone one or more injection molding processes has lost its inherent performance advantages due to the degradation that results in a decrease in molecular weight. On the other hand, the amido bond density of the waste nylon is further reduced, and the flame retardance becomes difficult, so that how to produce the flame-retardant nylon composite material by using the waste nylon becomes urgent.
Chinese patents have few reports on recycling of waste nylon, and CN104861644A proposes a flame-retardant recyclable insulation modified material, and nylon 6/66, glass fiber subjected to surface modification by a coupling agent and microencapsulated red phosphorus are subjected to melt blending to prepare a nylon material capable of being used for medium-high voltage electric appliance equipment, but a method for recycling the nylon material after injection molding is not introduced, so that the technical problem provided by the invention cannot be solved. In addition, nylon 6/66, glass fiber modified by coupling agent surface and microencapsulated red phosphorus cannot be effectively combined only by a melt blending mode, so that not only is the mechanical property loss of the resin great, but also the microencapsulated red phosphorus is still easy to precipitate, and the flame retardant property of the material cannot meet the requirement.
Disclosure of Invention
In order to solve the technical problems, the invention provides a composite material for recycling waste nylon and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a composite material for recycling waste nylon is prepared from the following components in parts by weight:
s1, waste nylon 45-70 parts, preferably 50-60 parts;
s2, microencapsulated flame retardant, 12-30 parts, preferably 16-24 parts;
s3, 20-40 parts of hollow glass beads, preferably 25-35 parts;
s4, assistant 1-3 parts, preferably 1.5-2.5 parts;
the microencapsulated flame retardant has a microencapsulated structure with the flame retardant as an inner core and the epoxy silane oligomer MP200 as a coating shell.
In some examples, the epoxysilane oligomer MP200 has an epoxy value of 4 to 5mmol/g and a viscosity of 30 to 40pa.s, preferably a mayform COATOSIL MP 200.
In some examples, the mass ratio of the flame retardant to the epoxy silane oligomer MP200 in the microencapsulated flame retardant is (0.2-5):1, preferably (0.3-3): 1.
In some examples, the flame retardant is one or more of red phosphorus, melamine pyrophosphate, diethyl aluminum hypophosphite, magnesium hydroxide, a complex phosphorus nitrogen flame retardant.
MP200 is an epoxy silane oligomer, is easy to aggregate at a solid-liquid interface to generate hydrolysis and polycondensation reactions, and can be hydrolyzed and polycondensed into macromolecules on the surface after being mixed with a flame retardant, so that the flame retardant is coated, the flame retardant is not easy to separate out, the flame retardant is more uniformly dispersed and not easy to agglomerate, and excellent flame retardant performance is exerted.
The reaction process of the MP200 with the flame retardant can be demonstrated by FIG. 1 according to the structural characteristics of the MP. As shown in fig. 1, a plurality of silicon hydroxyl groups at the head of the hydrolyzed MP200 are used for coating the flame retardant, a plurality of epoxy groups at the tail can be used for grafting the hollow glass beads and the broken nylon chain (the long molecular chain of the injection-molded nylon is broken to a certain extent, and the broken nylon chain contains a large amount of exposed amino or carboxyl groups, which can regenerate long-chain nylon through the reaction with the epoxy groups, thereby recovering the excellent performance), the long ether bond at the middle part can make the grafted product have a certain flexibility, and the hollow microspheres are prevented from being broken by pressure in the extrusion process to lose the reinforcing effect, thereby obtaining the reinforced renewable nylon composite material.
In some examples, the waste nylon is selected from at least one of long chain nylon PA66, PA6, PA610, PA612, PA11, PA1010, PA 12; preferably, the waste nylon is granular resin particles with no filling or filling amount less than 5%.
In some examples, the hollow glass microspheres have a density of 0.2 to 0.8g/cm3Preferably 0.4 to 0.65g/cm3(ii) a The compressive strength is 20-210MPa, preferably 60-200 MPa.
In some examples, the auxiliary agent is any one or more of a heat stabilizer, a light stabilizer, and a lubricant;
preferably, the heat stabilizer is one or more of copper salt antioxidants, phosphate antioxidants, hindered phenol antioxidants, phosphite antioxidants, thioester antioxidants and polymer antioxidants, more preferably copper salt antioxidants, and further preferably one or more of H320, H324, H1607, H3336, H3376, H3344, S5050, S5070 and AO-K;
preferably, the light stabilizer is one or more of salicylates, substituted acrylonitriles, triazines, benzotriazole, tolidine and amine stabilizers, more preferably one or more of UV234, UV360, TFB117 and H2002;
preferably, the lubricant is one or more of olefins, esters, stearates and stearates.
The invention also provides a preparation method of the composite material for recycling the waste nylon, which comprises the following steps:
1) mixing part of the microencapsulated flame retardant, the hollow glass microspheres and optionally a lubricant in an internal mixer to obtain a mixture A;
2) adding waste nylon particles, optional heat stabilizer, light stabilizer and lubricant from a main feeding port of a double-screw extruder; and adding the rest of the microencapsulated flame retardant from a first side feeding port, adding the mixture A from a second side feeding port, extruding and granulating to obtain the composite material.
According to the method, the microencapsulated flame retardant is mixed with the hollow glass microspheres firstly, so that hydroxyl on the surfaces of the hollow glass microspheres reacts with epoxy groups on the surfaces of the microencapsulated flame retardant, the microencapsulated flame retardant and the hollow glass microspheres are firmly combined, and the overall binding property of the composite material is enhanced; in addition, because the long ether chain segment with good elasticity is arranged between the hollow glass bead and the flame retardant, the hollow glass bead can be protected from being damaged in the processing process of the material.
In some examples, the internal mixer mixing conditions in step 1) are: the temperature is 210-;
the extrusion conditions of the twin-screw extruder in the step 2) are as follows: the feeding section is 80-220 ℃, the melting section is 220-255 ℃, and the machine head section is 210-250 ℃; the screw rotation speed is 200-;
preferably, the microencapsulated flame retardant in step 1) is added in an amount of 25-75% of its total mass.
In some examples, the microencapsulated flame retardant is prepared by:
A. adding flame retardant and emulsifier into water-alcohol solution, adjusting pH to 8-11, preferably 9-10, and stirring under heating;
B. adding MP200 into the solution, reacting and then aging to obtain a solid product;
C. and washing the solid product with alcohol, and drying to obtain the microencapsulated flame retardant.
In some examples, the emulsifier is one or more of silicones, alkyl salts, and ethers, and the amount of the emulsifier is 0.5 to 2%, preferably 1 to 1.5% of the total mass of the flame retardant and the MP 200.
Preferably, the heating temperature in the step A is 35-65 ℃, preferably 40-50 ℃, and the stirring time is 20-60min, preferably 30-40 min; the reaction time in the step B is 3-6h, preferably 4-5h, and the aging time after the reaction is 6-30h, preferably 12-18 h.
In some examples, the hydroalcoholic solution in step a is a mixture of deionized water and absolute ethanol in a mass ratio of 1:0.25-4, preferably 1: 0.5-2.
The invention has the beneficial effects that:
the invention provides a specific new scheme for preparing a composite material by using waste nylon aiming at the existing waste nylon products on the market, and the excellent performance of long-chain nylon can be effectively recovered and the excellent flame retardant property is added; in addition, the flame retardant in the composite material is not easy to separate out, the product has light weight and excellent mechanical property, and has wide industrial applicability.
Drawings
Fig. 1 is a schematic diagram of the reaction process of MP200 with a flame retardant.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative of the invention and are not to be construed as limiting the scope of the invention.
The raw material information used in the examples and comparative examples is shown in table 1:
TABLE 1 raw material information
Before use, the hollow glass beads in the following embodiments are all subjected to acid washing treatment, specifically:
adding the hollow glass beads into hydrofluoric acid solution with the mass concentration of 5%, stirring for 2 hours at room temperature, filtering and taking out the hollow glass beads. Washing the hollow glass beads by using a sodium carbonate aqueous solution with the mass fraction of 1%, and then washing by using deionized water until the pH value of a washing solution is approximately equal to 7.
The internal mixer used was a mix from Ruixing rubber machines, Inc. of Taixing.
The twin-screw extruder used was a product of Keplong Nanjing machines Ltd.
The oxygen index (OLI, in%) test methods in the examples and comparative examples were carried out using ISO4589 standard; smoke density was performed using ISO5659 test standard; the tensile strength is tested by adopting ISO527, and the impact strength is tested by adopting ISO 180; mold scale was graded by visual observation, wherein, grade 1: substantially free of mold fouling; and 2, stage: partially visible; and 3, level: mold fouling was severe.
[ PREPARATION EXAMPLE 1 ]
Preparing a microcapsule flame retardant a according to the following process:
the method comprises the following steps: to a four-necked flask equipped with a thermometer, stirrer, reflux condenser was added 250ml of deionized water and absolute ethanol at a ratio of 4: 1, heated to 35 ℃ and stirred for 60 min.
Step two: 50g of MPP and 1.25g of emulsifier OP-10 were added, the pH of the solution was adjusted to 8 with aqueous ammonia and the mixture was stirred for 60 min.
Step three: 200g of MP200 is slowly added into the solution, the reaction is stopped after the reaction is continued for 6h, and the solution is cooled and aged for 6h at room temperature.
Step four: and (3) washing the reaction product with ethanol, and drying in a vacuum oven to obtain the microcapsule flame retardant a.
[ PREPARATION EXAMPLE 2 ]
Preparing a microcapsule flame retardant b according to the following process:
the method comprises the following steps: to a four-necked flask equipped with a thermometer, a stirrer, and a reflux condenser were added 250ml of deionized water and absolute ethanol at a ratio of 1: 4, the temperature is raised to 65 ℃ and then the mixture is stirred for 20 min.
Step two: 25g of MPP and 3g of emulsifier OP-10 were added, the pH of the solution was adjusted to 11 with aqueous ammonia and the mixture was stirred for 20 min.
Step three: 125g of MP200 is slowly added into the solution, the reaction is stopped after the reaction is continued for 5h, and the solution is cooled and aged for 18h at room temperature.
Step four: and (3) washing the reaction product with ethanol, and drying in a vacuum oven to obtain the microcapsule flame retardant b.
[ PREPARATION EXAMPLE 3 ]
Preparing a microcapsule flame retardant c according to the following process:
the method comprises the following steps: to a four-necked flask equipped with a thermometer, stirrer, reflux condenser was added 240ml of deionized water and absolute ethanol at a ratio of 1: 2, the temperature is raised to 50 ℃ and then the mixture is stirred for 30 min.
Step two: 40g of red phosphorus powder WQ12 and 1.6g of emulsifier OP-10 were further added, and the solution was adjusted to pH 10 with aqueous ammonia, followed by stirring for 30 min.
Step three: 120g of MP200 is slowly added into the solution, the reaction is stopped after the reaction is continued for 4h, and the solution is cooled and aged for 30h at room temperature.
Step four: and (3) washing the reaction product with ethanol, and drying in a vacuum oven to obtain the microcapsule flame retardant c.
[ PREPARATION EXAMPLE 4 ]
Preparing a microcapsule flame retardant d according to the following process:
the method comprises the following steps: 320ml of a mixture of deionized water and absolute ethyl alcohol in a ratio of 2:1 is added into a four-mouth bottle provided with a thermometer, a stirrer and a reflux condenser, and stirred for 40min after the temperature is raised to 40 ℃.
Step two: 40g of MPP and 0.96g of emulsifier OP-10 were added, the pH of the solution was adjusted to 9 with aqueous ammonia and the mixture was stirred for 40 min.
Step three: slowly adding 8g of MP200 into the solution, continuing to react for 3h, stopping the reaction, and cooling and aging at room temperature for 12 h.
Step four: and (3) washing the reaction product with ethanol, and drying in a vacuum oven to obtain the microcapsule flame retardant d.
[ PREPARATION EXAMPLE 5 ]
Preparing a microcapsule flame retardant e according to the following process:
the method comprises the following steps: 280ml of a mixture of deionized water and absolute ethyl alcohol in a ratio of 3:1 was added to a four-necked flask equipped with a thermometer, a stirrer and a reflux condenser, and stirred for 50min after the temperature was raised to 45 ℃.
Step two: 40g of OP1312 and 0.8g of emulsifier OP-10 were added, and the solution was adjusted to pH 9 with aqueous ammonia and stirred for 50 min.
Step three: 13.3g of MP200 was slowly added to the solution, the reaction was stopped after 3.5h of further reaction, and the solution was aged for 20h at room temperature.
Step four: and (3) washing the reaction product with ethanol, and drying in a vacuum oven to obtain the microcapsule flame retardant e.
[ PREPARATION EXAMPLE 6 ]
Preparation was carried out in substantially the same manner as in preparative example 2, except that: MP200 is replaced with KH 550. The product obtained by the preparation is recorded as microcapsule flame retardant f.
[ PREPARATION EXAMPLE 7 ]
Preparation was carried out in substantially the same manner as in preparative example 2, except that: MP200 is replaced with GR 216. The product obtained was designated as microencapsulated flame retardant g.
[ example 1 ]
6g of the microencapsulated flame retardant a, 20g of HS46 and 0.2g E of wax were placed in an internal mixer and mixed at a temperature of 210 ℃ and a rotation speed of 20rpm for 2min to obtain a mixture A.
Using twin screw extrusion, 45g of PA6 regrind, 0.2g 1010, 0.2g 168, 0.3g UV234, 0.3g S-EED, 0.2g E wax were added from the main feed, 6g microencapsulated flame retardant was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 230-.
[ example 2 ]
10g of the microencapsulated flame retardant b, 40g of HS46 and 0.5g E of wax were placed in an internal mixer and mixed at 260 ℃ and 100rpm for 10min to obtain a mixture A.
Using twin screw extrusion, 45g of PA6 regrind, 0.6g H3344, 0.3g of UV234, 0.4g S-EED, 0.5g E wax were mixed well and fed from the main feed, 20g of microencapsulated flame retardant was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 235 ℃ and 245 ℃, the head section is 210 ℃ and 230 ℃, and the rotating speed is 400 rpm.
[ example 3 ]
6g of the microencapsulated flame retardant c, 27g of HS46 and 0.7g E of wax were placed in an internal mixer and mixed at a temperature of 230 ℃ and a rotation speed of 80rpm for 5 minutes to obtain a mixture A.
Using twin screw extrusion, 55g of PA66 regrind, 0.6g H3344, 0.4g of UV234, 0.4g S-EED, 0.4g of AC540A were mixed well and fed from the main feed, 15g of microencapsulated flame retardant was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 240 ℃ and 245 ℃, the head section is 220 ℃ and 250 ℃, and the rotating speed is 260 rpm.
[ example 4 ]
12g of microencapsulated flame retardant d, 25g of HS65 and 1g E of wax were placed in an internal mixer at 245 ℃ and 30rpm for 3min to obtain mixture A.
Using twin screw extrusion, 50g of PA66 regrind, 0.6g H3344, 0.3g of UV234, 0.3g S-EED, 0.2g of AC540A were mixed well and fed from the main feed, 4g of microencapsulated flame retardant was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 100 ℃ and 220 ℃, the melting section is 220 ℃ and 245 ℃, the head section is 210 ℃ and 230 ℃, and the rotating speed is 250 rpm.
[ example 5 ]
6g of the microencapsulated flame retardant e, 35g of HS65 and 0.6g of AC540A were placed in an internal mixer and mixed at 255 ℃ and 40rpm for 4min to obtain a mixture A.
Using twin screw extrusion, 60g of PA66 regrind, 0.6g H3344, 0.3g of UV234, 0.3g S-EED, 0.5g E wax were mixed well and fed from the main feed, 18g of microencapsulated flame retardant was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 220-245 ℃, the head section is 220-235 ℃ and the rotating speed is 350 rpm.
[ example 6 ]
Using twin screw granulation, 60g of PA66 feed back, 0.6g H3344, 0.3g of UV234, 0.3g S-EED, 0.5g E wax, 0.6gAC540A were fed from the main feed, 24g of microencapsulated flame retardant e was fed from the first side and 35g of HS65 was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 220-245 ℃, the head section is 220-235 ℃ and the rotating speed is 350 rpm.
Comparative example 1
A composite material was prepared in substantially the same manner as in example 2, except that: replacing the microencapsulated flame retardant b with the microencapsulated flame retardant f.
Comparative example 2
A composite material was prepared in substantially the same manner as in example 2, except that: replacing the microencapsulated flame retardant b with the microencapsulated flame retardant g.
Comparative example 3
A composite material was prepared in substantially the same manner as in example 2, except that: replacing the microencapsulated flame retardant b with MPP and MP200 which are not subjected to microencapsulation treatment, and specifically comprising the following steps:
1.7g of MPP, 8.3g of MP200, 40g of HS46 and 0.5g of 0.5g E wax were placed in an internal mixer and mixed at 260 ℃ and 100rpm for 10min to obtain a mixture A.
Using twin screw granulation, 45g of renewable PA1012, 0.6g H3344, 0.3g UV234, 0.4g S-EED, 0.5g E wax were mixed well and fed from the main feed, 3.3g MPP, 16.7g MP200 were fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 235 ℃ and 245 ℃, the head section is 210 ℃ and 230 ℃, and the rotating speed is 400 rpm.
Comparative example 4
A composite material was prepared in substantially the same manner as in example 2, except that: replacing the microencapsulated flame retardant b with MPP, which specifically comprises the following steps:
10g of MPP, 40g of HS46 and 0.5g E of wax are placed in an internal mixer and mixed for 10min at a temperature of 260 ℃ and a rotation speed of 100rpm to obtain a mixture A.
Using twin screw granulation, 45g of renewable PA1012, 0.6g H3344, 0.3g UV234, 0.4g S-EED, 0.5g E wax were mixed well and added from the main feed, 20g MPP was fed from the first side and mixture A was fed from the second side. Wherein, the feeding section is 80-220 ℃, the melting section is 235 ℃ and 245 ℃, the head section is 210 ℃ and 230 ℃, and the rotating speed is 400 rpm.
The nylon composites prepared in the examples and comparative examples were subjected to the performance test in table 2, and the results were as follows:
TABLE 2 Performance test and results of Nylon composites
Compared with the comparative examples 1 and 2 and the example 2, the flame retardance of the material is very poor if the MP200 is changed into the conventional silane coupling agent KH550 or POE-g-MAH, and particularly, the smoke density is improved because the oxygen index of the material is greatly reduced after the elastomer is added due to the improvement of flammability; and the density of the material is improved due to severe breakage of the glass beads; in addition, the mechanical property of the material is obviously reduced. Compared with the example 2, the comparison example 3 shows that if the flame retardant is not coated, only the MP200 and the flame retardant are respectively and independently added, the flame retardance of the material is slightly better than that of the comparison examples 1 and 2 due to the fact that silicon element and phosphorus-silicon synergy are still introduced, but the problems of poor mechanical property and high density of the material caused by the reasons still exist; and the flame retardant is easy to separate out under the condition of long-term storage of the material. Comparative example 4 the performance of the composite as a whole is worse with only the flame retardant added alone. In addition, the preparation process of the composite material is slightly different from that of the composite material in example 2 in example 6, the microencapsulated flame retardant and the hollow glass microspheres are not blended, so that the composite material has no advantages in material compatibility, cannot exert the effect of supporting the hollow glass microspheres to the maximum extent, shows that the composite material has slightly poor material performance and slightly higher density, but still has remarkable advantages compared with other comparative examples, and shows the advancement of the formula of the composite material.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The composite material for recycling the waste nylon is characterized by being prepared from the following components in parts by weight:
s1, waste nylon 45-70 parts, preferably 50-60 parts;
s2, microencapsulated flame retardant, 12-30 parts, preferably 16-24 parts;
s3, 20-40 parts of hollow glass beads, preferably 25-35 parts;
s4, assistant 1-3 parts, preferably 1.5-2.5 parts;
the microencapsulated flame retardant has a microencapsulated structure with the flame retardant as an inner core and the epoxy silane oligomer MP200 as a coating shell.
2. The composite material for recycling waste nylon according to claim 1, wherein the mass ratio of the flame retardant to the epoxy silane oligomer MP200 in the microencapsulated flame retardant is (0.2-5):1, preferably (0.3-3): 1.
3. The composite material for recycling waste nylon according to claim 2, wherein the flame retardant is one or more of red phosphorus, melamine pyrophosphate, diethyl aluminum hypophosphite, magnesium hydroxide and composite phosphorus-nitrogen flame retardant.
4. The composite material for recycling waste nylon according to claim 1, wherein the waste nylon is selected from at least one of long-chain nylon PA66, PA6, PA610, PA612, PA11, PA1010 and PA 12; preferably, the waste nylon is granular resin particles with no filling or filling amount less than 5%.
5. The composite material for recycling waste nylon according to claim 1, wherein the density of the hollow glass beads is 0.2-0.8g/cm3Preferably 0.4 to 0.65g/cm3(ii) a The compressive strength is 20-210MPa, preferably 60-200 MPa.
6. The composite material for recycling waste nylon according to any one of claims 1 to 5, wherein the auxiliary agent is any one or more of a heat stabilizer, a light stabilizer and a lubricant;
preferably, the heat stabilizer is one or more of copper salt antioxidants, phosphate antioxidants, hindered phenol antioxidants, phosphite antioxidants, thioester antioxidants and polymer antioxidants, more preferably copper salt antioxidants, and further preferably one or more of H320, H324, H1607, H3336, H3376, H3344, S5050, S5070 and AO-K;
preferably, the light stabilizer is one or more of salicylates, substituted acrylonitriles, triazines, benzotriazole, tolidine and amine stabilizers, more preferably one or more of UV234, UV360, TFB117 and H2002;
preferably, the lubricant is one or more of olefins, esters, stearates and stearates.
7. The method for preparing the composite material for recycling the waste nylon according to any one of claims 1 to 6, which is characterized by comprising the following steps:
1) mixing part of the microencapsulated flame retardant, the hollow glass microspheres and optionally a lubricant in an internal mixer to obtain a mixture A;
2) adding waste nylon particles, optional heat stabilizer, light stabilizer and lubricant from a main feeding port of a double-screw extruder; and adding the rest of the microencapsulated flame retardant from a first side feeding port, adding the mixture A from a second side feeding port, extruding and granulating to obtain the composite material.
8. The method for preparing the composite material for recycling the waste nylon according to claim 7, wherein the mixing conditions of the internal mixer in the step 1) are as follows: the temperature is 210-;
the extrusion conditions of the twin-screw extruder in the step 2) are as follows: the feeding section is 80-220 ℃, the melting section is 220-255 ℃, and the machine head section is 210-250 ℃; the screw rotation speed is 200-;
preferably, the microencapsulated flame retardant in step 1) is added in an amount of 25-75% of its total mass.
9. The method for preparing the composite material for recycling the waste nylon according to claim 7, wherein the method for preparing the microencapsulated flame retardant comprises the following steps:
A. adding flame retardant and emulsifier into water-alcohol solution, adjusting pH to 8-11, preferably 9-10, and stirring under heating;
B. adding MP200 into the solution, reacting and then aging to obtain a solid product;
C. and washing the solid product with alcohol, and drying to obtain the microencapsulated flame retardant.
10. The method for preparing the composite material by recycling the waste nylon according to claim 9, wherein the emulsifier is one or more of silicones, alkyl salts and ethers, and the amount of the emulsifier is 0.5-2% of the total mass of the flame retardant and the MP 200.
Preferably, the heating temperature in the step A is 35-65 ℃, preferably 40-50 ℃, and the stirring time is 20-60min, preferably 30-40 min; the reaction time in the step B is 3-6h, preferably 4-5h, and the aging time after the reaction is 6-30h, preferably 12-18 h.
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