CN110791083A

CN110791083A - High-antibacterial high-weather-resistance spraying-free polyamide composite material and preparation method thereof

Info

Publication number: CN110791083A
Application number: CN201910789171.XA
Authority: CN
Inventors: 徐凯华
Original assignee: Shanghai Huahe Composite Material Co Ltd
Current assignee: Huahe New Material Technology Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-02-14
Anticipated expiration: 2039-08-26
Also published as: CN110791083B

Abstract

The invention discloses a high-antibacterial high-weather-resistance spraying-free filled polyamide composite material and a preparation method thereof, and the high-antibacterial high-weather-resistance spraying-free filled polyamide composite material is composed of the following raw materials in parts by weight: 40-80 parts of polyamide resin, 3-10 parts of compatilizer, 1-8 parts of dispersing agent, 8-25 parts of functional master batch and 1-5 parts of weather-resistant auxiliary agent, wherein the functional master batch comprises the following components in percentage by weight: 3-10 parts of acrylate copolymer, 3-8 parts of nano aerogel, 1-6 parts of silver ion antibacterial agent and 1-5 parts of metallic toner. The invention has the beneficial effects that: the obtained high-performance polyamide composite material not only has good high-gloss effect, but also ensures that the antibacterial rate of the polyamide material is more than or equal to 99%, and obviously improves the glossiness, the surface color difference and the like of the composite material in long-period illumination (2000h) compared with the conventional material, thereby meeting the performance requirements of both antibacterial property and long-period illumination resistance stability when the spraying-free polyamide composite material is simultaneously applied to automotive interior and exterior.

Description

High-antibacterial high-weather-resistance spraying-free polyamide composite material and preparation method thereof

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-antibacterial high-weather-resistance spraying-free polyamide composite material and a preparation method thereof.

Background

With the trend of intellectualization and environmental protection in the traditional fields of modern automobiles, household appliances and the like, people are continuously keen, the requirements on the performance of polymer-based composite materials are increasing, especially for some appearance parts such as small household appliance shells, automobile internal and external decorative cover plates and the like, the surface spraying process is adopted in the traditional processing mode, the processing process is complicated, and the volatile paint and the solvent with poor environmental protection have considerable negative effects on the working environment during processing and the later use environment, the spraying-free material is a novel polymer-based composite material with high environmental protection and special appearance which is gradually created aiming at the defects, the principle is that some special toner such as metallic toner, pearl powder and organic-inorganic hybrid toner are added into polymer matrix resin, and satisfactory appearance effect of a product can be obtained after direct injection molding.

Polyamide (PA, also called nylon) is a high-performance polymer matrix material, and its molecular chain contains a large amount of strong polar amide groups, and can form strong-acting intermolecular hydrogen bonds, and the toner system of the spraying-free material with such characteristics provides a good material base, so that the spraying-free research on polyamide materials also becomes one of the research hotspots in the industry in recent years.

The technical scheme is only improved aiming at the weld line problem of spray-free injection molding, CN 107559258 focuses on the weather resistance improvement of the spray-free material, the obtained product has better yellowing resistance effect, but the weather resistance improvement is concentrated on surface color difference △ E and gray scale, the most important surface gloss of the spray-free material is not related, CN108384228 provides an antistatic and antibacterial spray-free polyamide material, but the weather resistance improvement of the material is not improved, so the application range of the spray-free polyamide material is limited, and further, the spray-free polyamide materials are all subjected to melt blending and are mixed by a melt blending machine, so the extrusion performance of the raw materials is not reduced, and the extrusion performance of the raw materials is not reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a spraying-free polyamide composite material with high antibacterial property and high weather resistance.

The purpose of the invention is realized by the following technical scheme:

a high-antibacterial high-weather-resistance spraying-free polyamide composite material comprises the following raw materials in parts by weight:

the functionalized master batch comprises the following components in percentage by weight: 3-10 parts of acrylate copolymer, 3-8 parts of nano aerogel, 1-6 parts of silver ion antibacterial agent and 1-5 parts of metallic toner.

The preparation method of the functional master batch comprises the following steps: weighing the acrylate copolymer and the nano aerogel according to a proportion, uniformly mixing, putting into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating to 200 ℃ and keeping the temperature constant, uniformly stirring at a speed of 60 revolutions per minute for 10min, sequentially adding a silver ion antibacterial agent and metallic toner according to a certain proportion, continuously stirring for 30min, filling nitrogen to pressurize, guiding out the molten blend from an outlet at the bottom of the closed reaction kettle, cooling, and granulating to obtain the functional master batch.

Further, the polyamide resin is one or a mixture of more of PA6, PA66, PA46, PA610, PA1010, PA612 and PA 1212.

Furthermore, the compatilizer is glycidyl methacrylate grafted polyolefin elastomer POE-GMA, and the grafting rate is 0.8-1.2% as measured by a chemical titration method.

Further, the dispersing agent is one or more of calcium stearate, zinc stearate, polyethylene wax, low molecular weight copolyamide wax and the like.

Further, the acrylate copolymer is an acrylic acid-styrene-acrylonitrile terpolymer, wherein the acrylic acid content is 5-30%.

Furthermore, the nano-aerogel is silicon dioxide aerogel with nano pores, white particles, the porosity is 90-95%, the pore diameter is 20-50nm, and the particle size (D50) is 5-50 um.

Furthermore, the silver ion antibacterial agent is a colorless and transparent nano silver complex solution, the particle size of the nano silver is 2-10nm, and the silver content is more than or equal to 800 ppm.

Further, the metal toner is one or more of aluminum powder, aluminum silver powder, aluminum-silicon alloy powder, copper-gold powder, nano-silver glass microchip composite pigment and the like coated by resin.

Further, the weather-resistant auxiliary agent is one or more of carbon black, benzophenone and hindered amine light stabilizer.

The second purpose of the invention is to provide a spraying-free polyamide composite material with high antibacterial property and high weather resistance, which is characterized by comprising the following steps:

(1) weighing polyamide resin, a compatilizer, a dispersant and a weather-resistant auxiliary agent according to the weight parts, and uniformly mixing to obtain a mixed raw material:

(2) placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; and (3) placing the functional master batch into a side feeding bin of a screw rod of the extruder, and adding the functional master batch into a machine barrel of the extruder through a feeding screw rod. The diameter of the screw extruder used was 36mm, the length-diameter ratio L/D was 44, and the temperatures of the zones from the feed port to the head outlet of the main barrel were set as follows: 160 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃ with the main machine rotating speed of 200 r/min, and the spraying-free polyamide composite material with high antibacterial property and high weather resistance is obtained after the processes of melt extrusion, granulation, drying and the like.

Aiming at the condition that most of the prior art means focus on improvement of spraying-free characteristics and neglect of multi-functionalization, the multifunctional spraying-free highlight color master batch with weather resistance and antibiosis is prepared by adopting a melt blending method with moderate process and cost, and is successfully applied to the functional improvement of the polyamide composite material. On one hand, the nano-aerogel has an extremely high mesoporous structure which can effectively adsorb and complex a large amount of silver ion antibacterial agents, so that the nano-aerogel is prevented from losing activity in the processing and mixing stage; on the other hand, the master batch treatment and the two-step melt blending of the special metal toner can greatly improve the dispersion effect of the special metal toner in a polyamide matrix, and are beneficial to improving the surface spraying-free effect of the material. In addition, the high-weather-resistance ASA resin is used as a matrix, and simultaneously, the weather-resistance auxiliary agent is synchronously added in the melting and mixing process, so that the compatibility and the dispersibility of the weather-resistance auxiliary agent and a high-gloss toner system are improved.

Compared with the prior art, the invention has the following beneficial effects:

1. firstly, a modification mode of two-step melt blending extrusion is adopted, and on the basis of the traditional technical scheme, a key metal toner system is subjected to primary granulation pre-dispersion treatment, so that the dispersion effect of the metal toner system in a polyamide matrix is improved, and the modification mode has the advantages of relatively moderate cost, outstanding effect and excellent cost performance.

2. More importantly, aiming at the characteristics of poor stability and easy processing and inactivation of the active silver ion antibacterial agent, the silver ion antibacterial agent is effectively protected by utilizing a large number of nano-sized pore structures through efficient complexing and adsorption with porous nano-aerogel powder particles through masterbatching treatment, so that the polyamide composite material has high antibacterial property. In addition, the ASA resin used as the master batch substrate is compounded with the weather-resistant auxiliary agent, so that the weather resistance performance of the spraying-free polyamide material is greatly improved.

(3) The high-antibacterial and high-weather-resistance spraying-free polyamide composite material obtained by the technical scheme of the invention not only has good spraying-free effect, the glossiness (60 ℃) of the surface of the material is more than or equal to 90%, and the surface of the sample plate has no obvious defects of a welding line, silver wires and the like, but also has particularly outstanding antibacterial and weather-resistant characteristics, the antibacterial rate of the material to escherichia coli, staphylococcus aureus, aspergillus niger and the like is more than 99%, in a weather resistance test, a stricter standard method (SAEJ2527) for automobile exterior trimming parts is adopted, and a test result shows that the material still keeps more than 75% of the surface glossiness in an atmospheric simulation environment with long period (2000h) and multiple factors (heat, light and moisture), and the surface color difference value △ E of the material can be controlled within 2.0, so that the spraying-free polyamide composite material integrates excellent spraying-free effect, high antibacterial property and high weather-resistance stability.

Detailed Description

The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.

The raw materials used in the embodiment of the invention are as follows:

polyamide: polyamide 6F223-D, Ubbelohde viscometer test relative viscosity 2.35, Dismann, Netherlands.

A compatilizer: the POE-GMA is prepared by self-making glycidyl methacrylate grafted polyolefin elastomer POE-GMA, testing the grafting rate to be 0.85% by a chemical titration method, and grafting the POE elastomer in a molten state by initiating a GMA/styrene St mixture by a peroxide initiator through a double-screw extruder.

Dispersing agent: copolyamide wax T-55F, white particles, molecular weight 1500-.

ASA resin: 960A, 220 ℃ and 10kg, 15 MFR, 60% acrylate content, Korea.

Nano aerogel-1: silica aerogel powder AG-D, porosity 95%, pore diameter 20-30nm, particle size (D50)10-20um, Shenzhen Zhongji science and technology Limited.

Nano aerogel-2: silicon dioxide aerogel powder AP, the porosity is 95%, the aperture is 30-50nm, the particle diameter (D50) is 50-100um, Zhejiang Nannuo science and technology company.

Silver ion antibacterial agent: the gel nano silver solution has the silver particle average particle size (D50) of 1nm, the effective concentration of 2000ppm, the pH value of the solution of 7 +/-0.5 and Yurui chemical.

Metallic toner-1: aluminum silver powder SF-510, surface silica coated, average particle diameter (D50)10 um, solid content not less than 97%, Anhui Assun aluminum pigment Co., Ltd.

Metallic toner-2: the glass coated silver SG035 and the micron-sized glass microchip surface is plated with nano silver toner, the average grain diameter (D50) is 20um, Shanghai Dynasty times new material Co.

Weather resisting agent: hindered Amine (HALS) light stabilizer 5591, white crystalline powder, volatile matter less than or equal to 1.9 percent, Shandong Xinxiu chemical industry.

And (3) product performance testing:

and (3) testing the glossiness: the test was carried out according to ISO2813, injection molding specified standard sample plate, CS-380 surface gloss meter, test angle 60 °.

And (3) testing the condition of the spraying-free surface: A355X 100X 3.2mm standard sample plate is injection-molded by adopting a mode of oppositely feeding glue with a left gate and a right gate, the sample plate is placed in a standard environment with 23 ℃ and 50% RH for 48h, and then the condition of a welding line on the surface of the sample plate is observed in a standard inspection lamp box.

And (3) antibacterial property test: according to the standard method of GB/T31402, the test is carried out on the surface of a sample plate with the size of 60 multiplied by 3.2mm under the standard environment with the temperature of 23 ℃ and the RH of 50 percent, and the test strains are respectively escherichia coli, staphylococcus aureus and aspergillus niger.

And weather resistance test, namely performing a standard sample plate with the injection size of 100 multiplied by 10 multiplied by 3.2mm according to a standard method special for the automobile exterior trimming parts of SAE J2527, performing the test on an ATLAS Ci4000 xenon lamp aging tester according to a standard flow, wherein the test period is 2000h, and testing the surface gloss and the color difference value of the sample plate to △ E after the test is completed.

Example 1

Weighing the acrylate copolymer and the nano aerogel according to the data of example 1 shown in Table 1, and uniformly mixing to obtain a mixed raw material.

Putting the dried mixed raw materials into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating the reaction kettle to 200 ℃ and keeping the temperature constant, uniformly stirring the mixture for 10min at a speed of 60 revolutions per minute, weighing and adding a silver ion antibacterial agent and metallic toner according to the data of the example 1 shown in the table 1, continuously stirring the mixture for 30min, filling nitrogen to pressurize the mixture, and exporting, cooling and pelletizing the molten blend from an outlet at the bottom of the closed reaction kettle to obtain the functional master batch.

Example 2

The acrylate copolymer and the nano aerogel are weighed according to the data of example 2 shown in table 1 and mixed uniformly to obtain a mixed raw material.

Putting the dried mixed raw materials into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating the reaction kettle to 200 ℃ and keeping the temperature constant, uniformly stirring the mixture for 10min at a speed of 60 revolutions per minute, weighing and adding a silver ion antibacterial agent and metallic toner according to the data of the example 2 shown in the table 1, continuously stirring the mixture for 30min, filling nitrogen to pressurize the mixture, and exporting, cooling and pelletizing the molten blend from an outlet at the bottom of the closed reaction kettle to obtain the functional master batch.

TABLE 1 formulation of the functionalized masterbatch (Unit: gram)

	Example 1	Example 2	Example 3	Example 4	Example 5
						ASA resin	5	8	6	10	8
Nano state aerogel-1	3		8		6
						Nano state aerogel-2		4		5
Silver ion antibacterial agent	6	1	3	2	5
						Metallic toner-1	3		5
Metal toner-2		3		5	5

Example 3

The acrylate copolymer and the nano aerogel are weighed according to the data of example 3 shown in table 1 and mixed uniformly to obtain a mixed raw material.

Putting the dried mixed raw materials into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating the reaction kettle to 200 ℃ and keeping the temperature constant, uniformly stirring the mixture for 10min at a speed of 60 revolutions per minute, weighing and adding a silver ion antibacterial agent and metallic toner according to the data of the embodiment 3 shown in the table 1, continuously stirring the mixture for 30min, filling nitrogen to pressurize the mixture, and exporting, cooling and pelletizing the molten blend from an outlet at the bottom of the closed reaction kettle to obtain the functional master batch.

Example 4

The acrylate copolymer and the nano aerogel are weighed according to the data of example 4 shown in table 1, and are uniformly mixed to obtain a mixed raw material.

Putting the dried mixed raw materials into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating the reaction kettle to 200 ℃ and keeping the temperature constant, uniformly stirring the mixture for 10min at a speed of 60 revolutions per minute, weighing and adding a silver ion antibacterial agent and metallic toner according to the data of the embodiment 4 shown in the table 1, continuously stirring the mixture for 30min, filling nitrogen to pressurize the mixture, and exporting, cooling and pelletizing the molten blend from an outlet at the bottom of the closed reaction kettle to obtain the functional master batch.

Example 5

The acrylate copolymer and the nano aerogel are weighed according to the data of example 5 shown in table 1, and are uniformly mixed to obtain a mixed raw material.

Putting the dried mixed raw materials into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating the reaction kettle to 200 ℃ and keeping the temperature constant, uniformly stirring the mixture for 10min at a speed of 60 revolutions per minute, weighing and adding a silver ion antibacterial agent and metallic toner according to the data of the example 5 shown in the table 1, continuously stirring the mixture for 30min, filling nitrogen to pressurize the mixture, and exporting, cooling and pelletizing the molten blend from an outlet at the bottom of the closed reaction kettle to obtain the functional master batch.

TABLE 2 formulation table (unit: gram) of highly antibacterial, highly weather-resistant spray-free polyamide composite material

Example 6

The polyamide resin, the compatibilizer, the dispersant and the weather-resistant auxiliary agent were weighed according to the data of example 6 shown in table 2 and mixed uniformly to obtain a mixed raw material:

placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; and (3) placing the functional master batch into a side feeding bin of a screw rod of the extruder, and adding the functional master batch into a machine barrel of the extruder through a feeding screw rod. The diameter of the screw extruder used was 36mm, the length-diameter ratio L/D was 44, and the temperatures of the zones from the feed port to the head outlet of the main barrel were set as follows: 160 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃ with the main machine rotating speed of 200 r/min, and the spraying-free polyamide composite material with high antibacterial property and high weather resistance is obtained after the processes of melt extrusion, granulation, drying and the like.

Example 7

The polyamide resin, the compatibilizer, the dispersant and the weather-resistant auxiliary agent were weighed according to the data of example 7 shown in table 2 and mixed uniformly to obtain a mixed raw material:

Example 8

The polyamide resin, the compatibilizer, the dispersant and the weather-resistant auxiliary agent were weighed according to the data of example 8 shown in table 2 and mixed uniformly to obtain a mixed raw material:

Example 9

The polyamide resin, the compatibilizer, the dispersant and the weather-resistant auxiliary agent were weighed according to the data of example 9 shown in table 2 and mixed uniformly to obtain a mixed raw material:

Example 10

The polyamide resin, the compatibilizer, the dispersant and the weather-resistant auxiliary agent were weighed according to the data of example 10 shown in table 2, and uniformly mixed to obtain a mixed raw material:

Comparative example 1

Weighing 85 g of polyamide resin, 5 g of compatilizer, 2 g of dispersing agent, 3 g of weather-resistant auxiliary agent and 5 g of metallic toner, and uniformly mixing to obtain a mixed raw material:

placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; the diameter of the screw extruder used was 36mm, the length-diameter ratio L/D was 44, and the temperatures of the zones from the feed port to the head outlet of the main barrel were set as follows: 160 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 230 ℃ with the main machine rotating speed of 200 r/min, and the spraying-free polyamide composite material with high antibacterial property and high weather resistance is obtained after the processes of melt extrusion, granulation, drying and the like.

TABLE 3 test results of highly antibacterial, highly weather-resistant spray-free polyamide composite materials

Comparing the material test data of each example and comparative example in table 3, it can be seen that the polyamide composite material added with the multifunctional masterbatch has good characteristics of antibiosis, weather resistance, high gloss, etc. Through the test results of the comparative example 10 and the comparative example 1, the conventional polyamide material (comparative example 1) as a crystalline polymer material has a certain glossiness (about 70) and antibacterial and weather-resistant properties, which have a certain relationship with the chemical structure of its own molecular chain, but compared with the high antibacterial and high weather-resistant properties required by automotive interior and exterior trim, the performance index needs to be improved by adding corresponding functional additives, and the type matching and processing mode of the special functional additives become key factors for improving the material properties.

Comparing the data of each example 6-10, it can be seen that the nano-aerogel powder particles as the carrier of the antimicrobial agent and the metallic toner have direct influence on the dispersion condition of the antimicrobial agent molecules and the toner particles, and the low-porosity and medium-particle-size nano-aerogel used in examples 1, 3, and 4 is more favorable for the insertion and effective adsorption of the micropores of the functional additives, so that the material has better antimicrobial and weather-resistant effects, and after further optimizing the amount combination of the aerogel, the antimicrobial and the metallic toner (example 10), the surface gloss of the polyamide composite material can be increased from about 70 to about 94 of the conventional material (comparative example 1), and the surface of the injection molded sample has no obvious weld line, indicating that the material has good surface spray-free effect, and further, in the very important antimicrobial and weather-resistant tests, example 6 with the optimized scheme can achieve an antimicrobial rate of 99% or more in all of the three strains (escherichia coli, staphylococcus aureus, aspergillus niger) and the above-mentioned conventional material (example 1) can achieve a comprehensive improvement of a humidity reduction from about 0.5 to about 60% in the outdoor aging-resistant test (example 3).

The invention discloses a high-antibacterial high-weather-resistance spraying-free polyamide composite material and a preparation method thereof, which successfully realize the synergistic improvement and promotion of the characteristic indexes by adding an efficient compounded functional auxiliary agent master batch on the basis of the existing performance of polyamide.

Claims

1. A high-antibacterial high-weather-resistance spraying-free polyamide composite material is characterized in that: the feed comprises the following raw materials in parts by weight:

2. The highly antibacterial and highly weather-resistant spray-free polyamide composite material as claimed in claim 1, wherein: the polyamide resin is one or a mixture of more of PA6, PA66, PA46, PA610, PA1010, PA612 and PA 1212.

3. The highly antibacterial and highly weather-resistant spray-free polyamide composite material as claimed in claim 1, wherein: the compatilizer is glycidyl methacrylate grafted polyolefin elastomer POE-GMA, and the grafting rate is 0.8-1.2% by a chemical titration method test.

4. The highly antibacterial and highly weather-resistant spray-free polyamide composite material as claimed in claim 1, wherein: the dispersing agent is one or more of calcium stearate, zinc stearate, polyethylene wax, low molecular weight copolyamide wax and the like.

5. The highly antibacterial and highly weather-resistant spray-free polyamide composite material as claimed in claim 1, wherein: the preparation method of the functional master batch comprises the following steps: weighing the acrylate copolymer and the nano aerogel according to a proportion, uniformly mixing, putting into a closed reaction kettle, vacuumizing the reaction kettle, filling inert nitrogen to protect the reaction kettle to normal pressure, heating to 200 ℃ and keeping the temperature constant, uniformly stirring at a speed of 60 revolutions per minute for 10min, sequentially adding a silver ion antibacterial agent and metallic toner according to a certain proportion, continuously stirring for 30min, filling nitrogen to pressurize, guiding out the molten blend from an outlet at the bottom of the closed reaction kettle, cooling, and granulating to obtain the functional master batch.

6. The highly antibacterial highly weather-resistant spray-free polyamide composite material as claimed in claim 1 or 5, wherein: the acrylate copolymer is an acrylic acid-styrene-acrylonitrile terpolymer, wherein the acrylic acid content is 5-30%.

7. The highly antibacterial highly weather-resistant spray-free polyamide composite material as claimed in claim 1 or 5, wherein: the nano-aerogel is silica aerogel with nano pores and white particles, the porosity is 90-95%, the pore diameter is 20-50nm, and the particle size (D50) is 5-50 um.

8. The highly antibacterial highly weather-resistant spray-free polyamide composite material as claimed in claim 1 or 5, wherein: the silver ion antibacterial agent is a colorless and transparent nano silver complex solution, the particle size of the nano silver is 2-10nm, and the silver content is more than or equal to 800 ppm.

9. The highly antibacterial highly weather-resistant spray-free polyamide composite material as claimed in claim 1 or 5, wherein: the metal toner is one or more of aluminum powder, aluminum-silver powder, aluminum-silicon alloy powder, copper-gold powder and nano-silver glass microchip composite pigment coated by resin.

10. The highly antibacterial and highly weather-resistant spray-free polyamide composite material as claimed in claim 1, wherein: the weather-resistant auxiliary agent is one or more of carbon black, benzophenone and hindered amine light stabilizer.

11. The process for preparing a highly antibacterial, highly weather-resistant spray-free polyamide composite material as claimed in any one of claims 1 to 5 and 10, comprising the steps of:

(1) weighing polyamide resin, a compatilizer, a dispersant and a weather-resistant auxiliary agent according to the weight parts, and uniformly mixing to obtain a mixed raw material;