CN112662168A - Antibacterial mildew preventive, halogen-free flame-retardant antibacterial mildew-proof nylon composite material, and preparation method and application thereof - Google Patents

Antibacterial mildew preventive, halogen-free flame-retardant antibacterial mildew-proof nylon composite material, and preparation method and application thereof Download PDF

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CN112662168A
CN112662168A CN202011415381.1A CN202011415381A CN112662168A CN 112662168 A CN112662168 A CN 112662168A CN 202011415381 A CN202011415381 A CN 202011415381A CN 112662168 A CN112662168 A CN 112662168A
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antibacterial
nylon
halogen
free flame
temperature
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CN112662168B (en
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甘典松
胡天輝
刘学文
宋克东
尹涛
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Zhuzhou Times Engineering Plastics Industry Co ltd
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Abstract

The invention discloses an antibacterial mildew preventive and a preparation method thereof, wherein a halloysite nanotube is taken as a carrier, and a complex of sodium hexametaphosphate and silver nitrate is loaded on the halloysite nanotube. The antibacterial mildew preventive has better dispersibility and better compatibility with a nylon matrix, the former improves the antibacterial mildew-proof efficiency of the material, and the latter improves the color stability and mechanical comprehensive performance of the material. Also discloses a halogen-free flame-retardant antibacterial mildewproof nylon composite material which mainly comprises the following components: 40-80 parts of nylon resin, 10-50 parts of reinforcing component, 4-12 parts of halogen-free flame retardant, 3-10 parts of halloysite nanotube and 0.1-0.5 part of antioxidant. The preparation method and the application of the halogen-free flame-retardant antibacterial mildew-proof nylon composite material are also disclosed, the operation is simple, the cost is low, various performances after injection molding are excellent, and the halogen-free flame-retardant antibacterial mildew-proof nylon composite material can be widely applied to the fields of automobile buses, bus seats and the like.

Description

Antibacterial mildew preventive, halogen-free flame-retardant antibacterial mildew-proof nylon composite material, and preparation method and application thereof
Technical Field
The invention belongs to the field of composite materials, and particularly relates to an antibacterial mildew preventive, a halogen-free flame-retardant antibacterial mildew-proof nylon composite material, and a preparation method and application thereof.
Background
Along with the continuous improvement of the living standard of people, the cleanliness of the living environment is increasingly improved, and the antibacterial and mildewproof effects are more and more emphasized in daily life; on the other hand, the continuous deterioration of ecological environment further increases the necessity of antibacterial and mildewproof work, and particularly, the new crown epidemic situation spreads all over the world in the year, and the antibacterial and mildewproof work is pushed to a new high point.
Nylon, also known as polyamide, is a generic term for polymers containing amide linkages in the main molecular chain. The high-performance polyamide acid amide bond has good chemical stability, excellent mechanical property, wear resistance and processability, is more and more widely applied to the fields of electronics, electric appliances, automobiles, household appliances and the like, frequently contacts with human bodies in daily life, and the strong polarity of the amide bond is easy to absorb moisture in the air, thereby providing a good place for the propagation of bacteria and fungi and bringing potential safety hazards to the health of the human bodies.
At present, the aim of nylon antibiosis is achieved by adding an antibacterial agent and adopting a blending modification method. Common antibacterial agents can be classified into inorganic antibacterial agents and organic antibacterial agents. Compared with organic antibacterial agents, the inorganic antibacterial agent has the advantages of continuity, durability, broad antibacterial spectrum, difficult generation of drug resistance, good heat resistance, high safety and the like. However, the conventional antibacterial nylon on the market has the following problems:
(1) the inorganic antibacterial agent has poor compatibility and uneven dispersion with a nylon resin matrix, and low antibacterial efficiency;
(2) the stability of the inorganic antibacterial agent is poor, so that the color of the nylon material is unstable;
(3) only the antibacterial property of the composite material is considered, and the mildew-proof property is not involved;
(4) the inorganic antibacterial agent has obvious influence on the mechanical comprehensive performance of the nylon material, especially the impact toughness.
The chinese patent application publication No. CN106633829A discloses an antibacterial nylon composite material and a preparation method thereof, which only considers the manner of adding the antibacterial agent, neglects the compatibility of the carrier and the matrix, does not relate to key indexes such as the mildew resistance, the color stability and the mechanical comprehensive performance of the composite material, and cannot satisfy the industrial application.
Therefore, aiming at the problems of low antibacterial efficiency, unstable color, peculiar smell, reduction of mechanical property and the like of the material caused by poor compatibility and uneven dispersion of the inorganic antibacterial agent and the nylon resin matrix in the antibacterial nylon, the halogen-free flame-retardant antibacterial mildewproof nylon composite material capable of simultaneously improving the mechanical property and the antibacterial property of the polymer matrix has very important significance.
Disclosure of Invention
The invention aims to solve the technical problems that the defects and the defects in the background technology are overcome, a novel nanoscale inorganic antibacterial agent capable of simultaneously improving the mechanical property and the antibacterial property of a polymer matrix and a preparation method thereof are provided, and a halogen-free flame-retardant antibacterial mildew-proof nylon composite material and a preparation method and application thereof are provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an antibacterial mildew preventive takes a halloysite nanotube as a carrier, and a complex of sodium hexametaphosphate and silver nitrate is loaded on the halloysite nanotube.
The preparation method of the antibacterial mildew preventive comprises the following steps: drying natural halloysite by hot air, crushing, preparing a mixed solution of crushed halloysite powder, distilled water, silver nitrate and powdery sodium hexametaphosphate according to a mass ratio of 1:10: 0.1-0.5: 0.001-0.2, stirring at normal temperature, standing for a period of time, drying a settled solution after standing and layering in vacuum until the halloysite is blocky, crushing the blocky halloysite, and sieving to obtain the halloysite nanotube.
The preparation method of the antibacterial mildew preventive is preferably that the hot air drying temperature is 80-100 ℃, and the hot air drying time is 8-12 hours; the stirring time is 20-26 hours, and the standing time is 48-72 hours; the temperature of the vacuum drying is 60-80 ℃, and the time of the vacuum drying is 18-24 h; and the sieving is to sieve through a 100-200 mesh sieve.
Halloysite is a natural silicate mineral with a tubular microscopic morphology, mainly composed of silicon-oxygen tetrahedra and aluminum-oxygen octahedra, SiO259 wt% of Al2O340.4 wt% of (B) Fe2O3The content was 0.25 wt%. Fe2O3Easy yellowing and unstable material color, and sodium hexametaphosphate can be mixed with Fe2O3The insoluble complex is formed by interaction and is settled and finally removed, so that the color stability of the material is ensured while the purity of the halloysite is improved; meanwhile, the sodium hexametaphosphate can interact with the silver nitrate to form a complex which is adsorbed on the wall of the halloysite tube, so that the stability of silver ions is improved, and the timeliness of the antibacterial agent is prolonged in the subsequent antibacterial process.
Based on a general inventive concept, the invention also provides a halogen-free flame-retardant antibacterial mildewproof nylon composite material consisting of the antibacterial mildewproof agent, which mainly comprises the following components in parts by weight:
the halloysite contains a special hollow tubular structure which can be used for loading an antibacterial agent and performing slow release under certain conditions; secondly, the inner wall of the halloysite nanotube contains a certain amount of hydroxyl groups, so that the compatibility with a nylon material with strong polarity can be improved; moreover, the iron oxide component can play a role in condensed phase smoke suppression when the polymer is burnt, and can be used as a cross-linking agent to promote the formation of a stable carbon layer, so that the flame retardant property of the composite material is improved. Compared with the antibacterial and mildewproof agent which takes the attapulgite as the carrier and the halloysite nanotube as the carrier, the antibacterial and mildewproof agent not only utilizes the hollow tubular structure, but also has hydroxyl on the surface, and the polar structure contained in the antibacterial and mildewproof agent is more favorable for improving the compatibility with a nylon matrix, promoting the dispersion of the antibacterial and mildewproof agent, improving the flame retardant property of the material due to the special chemical composition of the antibacterial and mildewproof agent, and the like.
The halogen-free flame-retardant antibacterial mildew-proof reinforced nylon composite material is prepared by a melt blending extrusion method through a self-made antibacterial mildew preventive with a slow release function, has more stable color, better surface smoothness, more excellent flame retardant property, antibacterial property and dimensional stability, has an oxygen index of more than 26 percent, meets the latest JT/T1095 and 2016 flame retardant standard for interior materials of clients, has an antibacterial rate of 99.9 percent for escherichia coli and staphylococcus aureus and a mildew resistance level of 0 (namely no long mildew), and can be widely applied to the fields of automobile buses, bus seats and the like.
Preferably, the nylon resin comprises one or more of nylon 6, nylon 66, nylon 11, nylon 12, nylon 612, nylon 1212 and aromatic nylon, and more preferably nylon 6.
Preferably, the reinforcing component comprises one or more of continuous glass fiber, chopped glass fiber, carbon fiber, talcum powder, calcium carbonate, barium sulfate and wollastonite, and the chopped glass fiber is more preferred.
Preferably, the halogen-free flame retardant comprises any one or a combination of several of phosphorus-nitrogen series flame retardants and alkyl phosphate series flame retardants; wherein the phosphorus-nitrogen series flame retardant comprises any one or more of melamine-polyphosphate (MP), melamine-polyphosphate (MP) and melamine-polyphosphate; the alkyl phosphate series flame retardant comprises one or more of alkyl hypophosphite, alkyl metaphosphate and alkyl phosphite, and is preferably a phosphorus-nitrogen series flame retardant.
Preferably, the antioxidant is any one or more of hindered phenol antioxidants and phosphite antioxidants.
The preparation method of the halogen-free flame-retardant antibacterial mildewproof nylon composite material comprises the following steps: after the nylon resin, the reinforcing component, the halogen-free flame retardant, the antibacterial mildew preventive and the antioxidant are dried in vacuum, the raw materials are uniformly mixed according to a proportion, and the halogen-free flame-retardant antibacterial mildew preventive nylon composite material is obtained after extrusion, traction and granulation.
The preparation method of the halogen-free flame-retardant antibacterial mildewproof nylon composite material is preferably that the temperature of a material barrel opening of an extruder used for extrusion is 210-220 ℃, the temperature of a conveying section is 220-240 ℃, the temperature of a compression section is 230-240 ℃, and the temperature of a metering section is 230-240 ℃; the temperature of the nozzle is 235-240 ℃; the rotating speed of the screw is 180-200 r/min; the feeding speed is 15-20 r/min.
The invention also provides an application of the halogen-free flame-retardant antibacterial mildewproof nylon composite material, and the application method comprises the following steps: drying the halogen-free flame-retardant antibacterial mildewproof nylon composite material in a vacuum drying oven at 100-110 ℃ for 3-4 h, cooling to room temperature under a closed condition, and performing injection molding.
In the application, preferably, the temperature of the material barrel opening of the injection molding machine for injection molding is 210-220 ℃, the temperature of the conveying section is 220-240 ℃, the temperature of the compression section is 230-240 ℃, and the temperature of the metering section is 230-245 ℃; the temperature of the nozzle is 235-240 ℃; the temperature of the die is 80-100 ℃; the rotating speed of the screw is 100-120 r/min; the injection back pressure is 60-80 Mpa.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the antibacterial and mildewproof agent, the special hollow tubular structure of the halloysite nanotube is used as a slow release channel of the antibacterial and mildewproof agent, so that the aggregation of the antibacterial and mildewproof agent is effectively prevented, and the antibacterial and mildewproof timeliness of the material is prolonged; the iron oxide component carried by the halloysite nanotube can play a role in condensed phase smoke suppression when a polymer is burnt, and can be used as a cross-linking agent to promote the formation of a stable carbon layer, so that the flame retardant property of the composite material is improved; the antibacterial mildew preventive has better dispersibility and better compatibility with a nylon matrix, the former improves the antibacterial mildew-proof efficiency of the material, and the latter improves the color stability and mechanical comprehensive performance of the material.
2. The halogen-free flame-retardant antibacterial mildewproof nylon composite material adopts the antibacterial mildewproof agent which takes the halloysite nanotube as the carrier, has good compatibility with a nylon resin matrix, uniform dispersion, no peculiar smell, excellent mechanical property, more stable color, better surface smoothness, more excellent flame retardant property, antibacterial property and dimensional stability, has an oxygen index of more than 26 percent, meets the flame retardant standard of JT/T1095 and 2016 client interior materials of the latest edition, has 99.9 percent of antibacterial rate on escherichia coli and staphylococcus aureus and has a mildewproof grade of 0 grade (namely no long mildew).
3. The halogen-free flame-retardant antibacterial mildewproof nylon composite material disclosed by the invention has excellent performances after injection molding according to the application method, and can be widely applied to the fields of automobile buses, bus seats and the like.
4. The preparation method disclosed by the invention is simple to operate, low in cost, ecological, environment-friendly and short in preparation period, and the prepared halogen-free flame-retardant antibacterial mildew-proof nylon composite material is uniform in dispersion and excellent in mechanical property, and is suitable for large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an SEM image of the distribution of the antimicrobial agent in the resin matrix with halloysite nanotubes as the carrier in example 2.
Fig. 2 is a result of testing the antibacterial rate of the halogen-free flame-retardant antibacterial mildewproof reinforced nylon composite material of example 2 to escherichia coli and staphylococcus aureus, and the antibacterial rate reaches 99.99%.
Fig. 3 and 4 are results of tests on the mildew-proof rating of the halogen-free flame-retardant antibacterial mildew-proof reinforced nylon composite material in example 2, wherein the mildew-proof rate reaches the highest level, i.e., no mildew is found at level 0.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
the invention relates to an antibacterial mildew preventive, which takes a halloysite nanotube as a carrier, wherein a complex of sodium hexametaphosphate and silver nitrate is loaded on the halloysite nanotube, and the preparation method comprises the following steps:
(1) sorting out lump materials with high whiteness from natural halloysite, drying the lump materials with hot air at the temperature of 80-100 ℃ for 8-12 h, and crushing the lump materials;
(2) mixing the pulverized halloysite powder, distilled water, silver nitrate and powdery sodium hexametaphosphate in different mass ratios to prepare a mixed solution;
(3) stirring at normal temperature for 20-26 h, and then standing for 48-72 h; taking the settled solution after standing and layering, and drying the settled solution in vacuum at the temperature of between 60 and 80 ℃ for 18 to 24 hours until the halloysite is blocky;
(4) crushing the blocky halloysite, and sieving the blocky halloysite through a sieve of 100-200 meshes to obtain the antibacterial mildew preventive taking the halloysite nanotube as a carrier; the formula of the antibacterial and antifungal agent prepared by different mass ratios is shown in table 1.
Table 1: nano antibacterial mildew preventive material formula table (by mass)
Composition of Antibacterial mildew preventive 1 Antibacterial mildew preventive 2 Antibacterial and antifungal agent 3 Antibacterial mildew preventive 4
Halloysite nanotubes 1 1 1 1
Distilled water 10 10 10 10
Silver nitrate 0.35 0.1 0.5 0.35
Sodium hexametaphosphate 0.15 0.15 0.15 0.05
Examples 2 to 6:
the halogen-free flame-retardant antibacterial mildewproof nylon composite material is prepared from the antibacterial mildewproof agent 1-4 in the embodiment 1, and the components and the using amount of the halogen-free flame-retardant antibacterial mildewproof reinforced nylon in the embodiments 2-6 and the comparative example 1 are shown in the table 2.
In examples 2 to 6 and comparative example 1, nylon 6 was used as the nylon resin, chopped glass fiber was used as the reinforcing component, and phosphite antioxidant 168 and hindered phenol antioxidant 1098 were used as the antioxidants.
Table 2: the halogen-free flame-retardant antibacterial mildew-proof reinforced nylon formulation tables of the respective examples 2-6 and the comparative example 1 (by mass ratio)
The preparation method of the halogen-free flame-retardant antibacterial mildew-proof nylon composite material comprises the following steps: the self-made antibacterial mildew preventive and the raw material components are dried in vacuum, mixed uniformly according to the proportion, extruded by an extruder, drawn and granulated to prepare the halogen-free flame-retardant antibacterial mildew-proof reinforced nylon composite material. Wherein the temperature of the extruder charging barrel mouth is 210-220 ℃, the temperature of the conveying section is 220-240 ℃, the temperature of the compression section is 230-240 ℃, and the temperature of the metering section is 230-240 ℃; the temperature of the nozzle is 235-240 ℃; the rotating speed of the screw is 180-200 r/min; the feeding speed is 15-20 r/min. Examples 2-6 and comparative example 1 all used the same extrusion process.
The application method of the halogen-free flame-retardant antibacterial mildewproof nylon composite material (preparation method of a standard sample strip for testing) comprises the following steps:
drying the extruded particles in a vacuum drying oven at 100-110 ℃ for 3-4 h, cooling to room temperature under a sealed condition, and performing injection molding. The temperature of the material barrel mouth of the injection molding machine used for injection molding is 210-220 ℃, the temperature of the conveying section is 220-240 ℃, the temperature of the compression section is 230-240 ℃, and the temperature of the metering section is 230-245 ℃; the temperature of the nozzle is 235-240 ℃; the temperature of the die is 80-100 ℃; the rotating speed of the screw is 100-120 r/min; the injection back pressure is 60-80 Mpa. Examples 2-6 and comparative example 1 all used the same injection molding process.
A series of performance tests such as antibacterial rate, mildew-proof grade, color difference value, flame retardance, mechanical comprehensive performance and the like are carried out on the halogen-free flame-retardant antibacterial mildew-proof reinforced nylons of the examples 2-6 and the comparative example 1, and the test results are shown in Table 3.
Table 3: results of Material Performance test of examples 2-6 and comparative example 1
Remarking: the color difference value is that the material without the antibacterial and antifungal agent is made into a standard color plate, and the color difference change between the standard color plate and the color difference plate in the examples and the comparative examples is measured by a color difference meter and is expressed by delta L.
In order to compare the comprehensive performance of the antibacterial and mildewproof agent under the same conditions, the content of silver nitrate in the comparative example 1 is the same as that of the antibacterial and mildewproof agent in the embodiment 2, and from the comparison of test results, the antibacterial and mildewproof agent taking halloysite with a hollow structure and hydroxyl groups on the inner wall as a carrier has better performances in the aspects of antibacterial efficiency, mildewproof grade and color stability, which are attributed to the interaction of the hydroxyl groups on the halloysite and amide groups of a nylon matrix and better compatibility, and the halloysite carrier promotes the dispersion of the antibacterial and mildewproof agent, remarkably improves the flame retardant performance and the comprehensive mechanical performance of the material, particularly the impact resistance.
The test results of comparative examples 3 to 6 show that in the preparation process of the antibacterial and antifungal agent using halloysite as a carrier, the optimal mass ratio of halloysite powder, distilled water, silver nitrate and powdery sodium hexametaphosphate is 1:10:0.35:0.15, and when the content of silver nitrate is low, the antibacterial or antifungal effect of the material cannot meet the requirement, as shown in examples 3 and 4; when the content of the silver nitrate is higher, the antibacterial or mildewproof effect of the material is more surplus, so that the unnecessary cost is increased, and the impact performance of the material is obviously reduced due to the excessive silver nitrate.
The test result of the embodiment 6 of the invention shows that when the proportion of the dispersant sodium hexametaphosphate is lower, the purification of erlotin is influenced, the impurity content is higher, the mechanical comprehensive performance of the composite material is influenced, and particularly the impact resistance is obviously reduced.
According to the invention, by using the halloysite purification technology and the nano antibacterial mildew preventive preparation technology taking the halloysite purification technology as the carrier, the synergistic effect between the halloysite and the antibacterial mildew preventive is exerted, the compatibility of the antibacterial mildew preventive and a nylon matrix is promoted, the antibacterial mildew resistance of the composite material is further improved, the toughness is maintained, the antibacterial mildew-proof nylon composite material with excellent comprehensive performance is prepared, and the technology has universal applicability to an antibacterial mildew-proof composite material system.
Fig. 1 is an SEM image of the distribution of the antibacterial agent using the halloysite nanotubes as the carrier in the nylon resin matrix in example 2, and it can be clearly seen that the halloysite nanotubes are uniformly distributed, which is the root cause for the improvement of the mechanical properties and the antibacterial and antifungal efficiency of the composite material.
Fig. 2 is a result of testing the antibacterial rate of the halogen-free flame-retardant antibacterial mildewproof reinforced nylon composite material of example 2 to escherichia coli and staphylococcus aureus, and the antibacterial rate reaches 99.99%.
Fig. 3 and 4 are results of tests on the mildew-proof rating of the halogen-free flame-retardant antibacterial mildew-proof reinforced nylon composite material in example 2, wherein the mildew-proof rate reaches the highest level, i.e., no mildew is found in level 0.

Claims (10)

1. An antibacterial mildew preventive is characterized in that halloysite nanotubes are used as a carrier, and a complex of sodium hexametaphosphate and silver nitrate is loaded on the halloysite nanotubes.
2. A method of preparing the antimicrobial mildewcide according to claim 1, comprising the steps of: drying natural halloysite by hot air, crushing, preparing a mixed solution of crushed halloysite powder, distilled water, silver nitrate and powdery sodium hexametaphosphate according to a mass ratio of 1:10: 0.1-0.5: 0.001-0.2, stirring at normal temperature, standing for a period of time, drying a settled solution after standing and layering in vacuum until the halloysite is blocky, crushing the blocky halloysite, and sieving to obtain the halloysite nanotube.
3. The preparation method of the antibacterial and antifungal agent as claimed in claim 2, wherein the temperature of the hot air drying is 80 ℃ to 100 ℃, and the time of the hot air drying is 8 to 12 hours; the stirring time is 20-26 hours, and the standing time is 48-72 hours; the temperature of the vacuum drying is 60-80 ℃, and the time of the vacuum drying is 18-24 h; and the sieving is to sieve through a 100-200 mesh sieve.
4. The halogen-free flame-retardant antibacterial mildewproof nylon composite material is characterized by mainly comprising the following components in parts by weight:
the antibacterial mildew preventive is the antibacterial mildew preventive described in claim 1 or prepared by the preparation method described in any one of claims 2 to 3.
5. The halogen-free flame retardant antibacterial mildewproof nylon composite material according to claim 4, wherein the nylon resin comprises one or more of nylon 6, nylon 66, nylon 11, nylon 12, nylon 612, nylon 1212 and aromatic nylon; the reinforcing component comprises one or more of continuous glass fiber, chopped glass fiber, carbon fiber, talcum powder, calcium carbonate, barium sulfate and wollastonite.
6. The halogen-free flame-retardant antibacterial mildewproof nylon composite material as claimed in claim 4, wherein the halogen-free flame retardant comprises any one or a combination of phosphorus nitrogen series flame retardants and alkyl phosphate series flame retardants; wherein the phosphorus-nitrogen series flame retardant comprises any one or more of melamine-polyphosphate, melamine-polyphosphate and melamine-polyphosphate; the alkyl phosphate series flame retardant comprises one or more of alkyl hypophosphite, alkyl metaphosphate and alkyl phosphite; the antioxidant is any one or more of hindered phenol antioxidant and phosphite antioxidant.
7. The preparation method of the halogen-free flame-retardant antibacterial mildewproof nylon composite material as claimed in any one of claims 4 to 6, is characterized by comprising the following steps: after the nylon resin, the reinforcing component, the halogen-free flame retardant, the antibacterial mildew preventive and the antioxidant are dried in vacuum, the raw materials are uniformly mixed according to a proportion, and the halogen-free flame-retardant antibacterial mildew preventive nylon composite material is obtained after extrusion, traction and granulation.
8. The preparation method of the halogen-free flame-retardant antibacterial mildewproof nylon composite material according to claim 7, wherein the temperature of a material barrel opening of an extruder used for extrusion is 210-220 ℃, the temperature of a conveying section is 220-240 ℃, the temperature of a compression section is 230-240 ℃, and the temperature of a metering section is 230-240 ℃; the temperature of the nozzle is 235-240 ℃; the rotating speed of the screw is 180-200 r/min; the feeding speed is 15-20 r/min.
9. The application of the halogen-free flame-retardant antibacterial mildewproof nylon composite material as set forth in any one of claims 4 to 6 or prepared by the preparation method as set forth in claim 7 or 8 is characterized in that the application method comprises the following steps: drying the halogen-free flame-retardant antibacterial mildewproof nylon composite material in a vacuum drying oven at 100-110 ℃ for 3-4 h, cooling to room temperature under a closed condition, and performing injection molding.
10. The use according to claim 9, wherein the injection molding machine has a barrel mouth temperature of 210 ℃ to 220 ℃, a conveying section temperature of 220 ℃ to 240 ℃, a compression section temperature of 230 ℃ to 240 ℃, and a metering section temperature of 230 ℃ to 245 ℃; the temperature of the nozzle is 235-240 ℃; the temperature of the die is 80-100 ℃; the rotating speed of the screw is 100-120 r/min; the injection back pressure is 60-80 Mpa.
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