Water-pressure-resistant polyamide composite material as well as preparation method and application thereof

Abstract

The invention discloses a water-pressure-resistant polyamide composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials, the water-pressure-resistant polyamide composite material comprises the following components in parts by weight: 23-48 parts of PA66, 6-16.5 parts of copolymerized nylon or semi-aromatic polyamide, 40-50 parts of glass fibers, 10-15 parts of inorganic minerals, 1-3 parts of a compatilizer and 0.5-1.5 parts of an auxiliary agent; wherein the inorganic mineral is at least one of wollastonite, talcum powder and nano-zinc oxide which are subjected to surface modification treatment by a silane coupling agent. The water-pressure-resistant polyamide composite material has the effect of obtaining the water-pressure-resistant polyamide composite material with excellent mechanical properties, so that the water-pressure-resistant polyamide composite material has the effect of being suitable for being applied to the bathroom industry.

Description

Technical Field

[0001] The present application relates to the technical field of polymer materials, and particularly relates to a water pressure-resistant polyamide composite material, a preparation method thereof, and an application thereof. Background Art

[0002] With the proposal of the demand for replacing steel with plastics and the continuous rise of copper prices, especially in the sanitary ware industry, there is an urgent need to find materials that can replace copper parts, and it is required that after soaking in water at 95 °C for 1000 h, it can withstand a water pressure test of 20 kg without cracking within 1 minute.

[0003] As one of the five major engineering plastics, polyamide (PA) has become a major choice object due to its excellent mechanical properties, chemical stability, and easy molding processing; however, polyamide has a large water absorption rate, and its mechanical properties decrease significantly after soaking in water, which limits the application of its modified materials in the sanitary ware industry. In order to make up for the defects of PA66 materials, it is necessary to modify them. In the prior art, composites are usually prepared by fiber reinforcement, inorganic filling, blending with other general plastics or nylon to improve the defects of PA66 materials, combining the processing fluidity of aliphatic polyamide and the strength and rigidity of semi-aromatic polyamide to improve the comprehensive performance of the composite material.

[0004] Chinese Patent with Publication No. CN114213840B discloses an ultra-high strength, low warpage, and low fiber floating PA reinforcing material and its preparation process. The ultra-high strength, low warpage, and low fiber floating PA reinforcing material includes: 20-40 parts of PA6, 55-80 parts of glass fiber, 2-8 parts of mineral powder, 2-8 parts of functional compatibilizer, 0.2-0.6 parts of lubricant, and 0.2-1.5 parts of antioxidant; the functional compatibilizer is maleic anhydride grafted ethylene-octene copolymer, maleic anhydride grafted ethylene-propylene copolymer, or maleic anhydride grafted ethylene-propylene-diene rubber; the PA6 includes high melt index PA6 and low melt index PA6, with melt indexes of 70-100 g / 10 min and 30-50 g / 10 min respectively, and the high melt index PA6 accounts for 40-50%, and the low melt index PA6 accounts for 40-60%.

[0005] However, this ultra-high strength, low warpage, and low fiber floating PA reinforcing material only solves the defects of high warpage, high fiber floating, and low gloss, and its water pressure resistance performance has not been effectively improved, resulting in its inability to pass the water pressure test of the material performance in the sanitary ware industry, which limits the application scenarios of polyamide and the development of the sanitary ware industry and needs to be improved. Summary of the Invention

[0006] In view of this, the first object of the present application is to provide a water pressure-resistant polyamide composite material to achieve the purpose of water pressure resistance. The specific scheme is as follows:

[0007] A water pressure-resistant polyamide composite material, comprising 23-48 parts by weight of PA66, 6-16.5 parts of copolymerized nylon or semi-aromatic polyamide, 40-50 parts of glass fiber, 10-15 parts of inorganic mineral, 1-3 parts of compatibilizer, and 0.5-1.5 parts of auxiliary agent; wherein, the inorganic mineral is at least one of wollastonite, talcum powder, and nano-zinc oxide that has been surface-modified with a silane coupling agent.

[0008] Preferably: the glass fiber is short-cut high-modulus high-strength glass fiber, with a length of 3-5 mm and a diameter of 9-15 μm, and is treated with a sizing agent, and the sizing agent is PP-g-MAH or silane type.

[0009] Preferably: the copolymerized nylon is at least one of PA66 / 6T, PA6I / 6T, PA66 / 6, and the semi-aromatic polyamide is PA6I / 6T.

[0010] Preferably: the auxiliary agent is an antioxidant and a lubricant; the antioxidant is at least one of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamide), 4,4'-thiobis(6-tert-butyl-3-methylphenol), cuprous iodide, potassium iodide; the lubricant is at least one of pentaerythritol stearate, calcium stearate, sodium stearate, magnesium stearate, and ethylene bisstearamide.

[0011] Preferably: it further comprises 1-2 parts by weight of colorant, and the colorant is black masterbatch, white masterbatch or colored masterbatch.

[0012] The second object of the present invention is to provide a method for preparing the water pressure-resistant polyamide composite material as described above, comprising the following steps:

[0013] Step 1, modification: Mix wollastonite, talcum powder, nano-zinc oxide with a silane coupling agent and react, and obtain modified inorganic mineral after surface modification treatment for standby;

[0014] Step 2, preparation: Prepare PA66, copolymerized nylon or semi-aromatic polyamide, glass fiber, modified inorganic mineral, compatibilizer, and auxiliary agent as standby materials according to parts by weight;

[0015] Step 3, mixing: Put the standby materials into a high-speed mixer for mixing, and then add silicone oil, and obtain a mixed material after mixing and stirring;

[0016] Step 4, granulation: Put the mixed material into a twin-screw extruder for extrusion and granulation.

[0017] Preferably: in step 4, control the extrusion temperature of the twin-screw extruder to be 230 - 300 °C, and the screw speed to be 400 - 480 rmp.

[0018] Preferably: the silane coupling agent is KH-570.

[0019] Preferably: in step 1, the surface modification treatment of wollastonite and nano-zinc oxide includes pouring wollastonite into sodium hydroxide solution, pouring nano-zinc oxide into hydrochloric acid solution, magnetically stirring until evenly dispersed or completely dissolved, then slowly dripping the hydrochloric acid solution containing dissolved nano-zinc oxide into the sodium hydroxide solution containing wollastonite, stirring while adding until the pH of the mixed solution is 7, strongly stirring, followed by heat preservation and standing for 1 h, cooling, washing, suction filtration, drying, grinding and dispersing, sieving to remove agglomerated particles, and obtaining wollastonite with nano-zinc oxide attached to the surface for standby after drying; mixing absolute ethanol and deionized water according to a mass ratio of 3:5 to obtain an ethanol aqueous solution, then adding wollastonite with nano-zinc oxide attached to the surface to the ethanol aqueous solution, subjecting it to ultrasonic fragmentation treatment for 60 min, heating to 60 °C, stirring at 800 r / min for 2 h, waiting for the temperature to be constant after uniform stirring, then slowly and uniformly dripping an absolute ethanol solution containing 3% KH-570, cooling to room temperature after the reaction ends, washing with absolute ethanol and centrifuging to take out, and obtaining MT-ZnOw after drying in a vacuum drying oven; the surface modification treatment of the modified talc powder includes adding talc powder to absolute ethanol, stirring evenly at 300 r / min and heating ultrasonically to 60 °C in sequence, then adding a silane coupling agent KH-570 / stearic acid composite modifier with a mass fraction of 2% for reaction, and obtaining the modified talc powder after cooling, suction filtration, and drying after the reaction ends.

[0020] The third object of the present invention is to provide an application of a water pressure-resistant polyamide composite material, including using the water pressure-resistant polyamide composite material as described above and applying it to faucet water channels.

[0021] It can be seen from the above solutions that the present application provides a water pressure-resistant polyamide composite material, its preparation method and application. The water pressure-resistant polyamide composite material, its preparation method and application have the following beneficial effects:

[0022] 1. Achieve the effect of obtaining a water pressure-resistant polyamide composite material with excellent mechanical properties, making the water pressure-resistant polyamide composite material suitable for application in the bathroom industry.

[0023] 2. By coating nano-zinc oxide on the surface of wollastonite, the sharp edges and corners of wollastonite are filled, avoiding internal stress concentration points, while maintaining the reinforcing performance of inorganic minerals and the characteristics of nano-zinc oxide, solving the agglomeration problem of nano-zinc oxide, and thus effectively improving the interfacial strength between the filler and the polymer.

[0024] 3. By using wollastonite as a fibrous inorganic mineral filler, due to its regular surface structure and low price, while partially replacing glass fiber and filling it into the PA66 matrix to improve the crystallization behavior and reduce water absorption, the cost can be significantly reduced, and a polyamide composite material with effective hydrolysis resistance can be obtained.

[0025] 4. By using the silane coupling agent KH-570 to modify MT-ZnOw and talc powder, the processing fluidity, notched impact strength and elongation rate of the polyamide composite material can be effectively improved.

[0026] 5. After soaking the water pressure-resistant polyamide composite material in water at 95°C for 1000 h, based on the water pressure test of 20 kg, it has the water pressure resistance performance of not cracking within 1 minute. Detailed implementation manners

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] It should be noted that PA66, compatibilizer, additives, black masterbatch, white masterbatch and color masterbatch in the embodiments of the present application are all commercially available and will not be elaborated here. At the same time, the intrinsic viscosity of the PA66 chips is 3.2, and the sizing agent used in the embodiments of the present application is PP-g-MAH.

[0029] The water pressure-resistant polyamide composite material of the present application, its preparation method and application will be specifically described below.

[0030] A water pressure-resistant polyamide composite material, comprising 23-48 parts by weight of PA66, 6-16.5 parts of copolyamide or semi-aromatic polyamide, 40-50 parts of glass fiber, 10-15 parts of inorganic mineral, 1-3 parts of compatibilizer, 0.5-1.5 parts of additives and 1-2 parts of colorant. Among them, the inorganic mineral is at least one of wollastonite, talc powder, and nano-zinc oxide surface-modified by a silane coupling agent.

[0031] Among them, the glass fiber is short-cut high-modulus high-strength glass fiber, with a length of 3-5 mm and a diameter of 9-15 μm, and is treated with a sizing agent, and the sizing agent is PP-g-MAH or silane type.

[0032] The copolyamide is at least one of PA66 / 6T, PA6I / 6T, and PA66 / 6, and the semi-aromatic polyamide is PA6I / 6T. The additives are antioxidants and lubricants. The antioxidant is at least one of bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamide), 4,4'-thiobis(6-tert-butyl-3-methylphenol), cuprous iodide, and potassium iodide; the lubricant is at least one of pentaerythritol stearate, calcium stearate, sodium stearate, magnesium stearate, and ethylene bisstearamide. The colorant is a black masterbatch, a white masterbatch, or a color masterbatch.

[0033] The silane-based sizing agent is KH-792, KH-570, KH-550, KH-580, or A-151, and the composite silane-based sizing agent is obtained by adding titanium dioxide and the silane-based sizing agent to an aqueous ethanol solution and mixing them at high speed. By using the silane-based sizing agent, compared with the conventional silane-based sizing agent, it has an improved wetting effect on glass fibers, and further improves the dispersibility and mechanical property improvement effect of glass fibers in the water-pressure-resistant polyamide composite material.

[0034] A method for preparing the water-pressure-resistant polyamide composite material as described above includes the following steps:

[0035] Step 1, modification: Mix wollastonite, talc powder, nano-zinc oxide with a silane coupling agent and react, and obtain modified inorganic minerals after surface modification treatment for standby;

[0036] Step 2, preparation: Prepare PA66, copolyamide or semi-aromatic polyamide, glass fiber, modified inorganic minerals, compatibilizer, and additives as standby materials according to parts by weight;

[0037] Step 3, mixing: Put the standby materials into a high-speed mixer for mixing, then add silicone oil, and obtain a mixed material after mixing and stirring;

[0038] Step 4, granulation: Put the mixed material into a twin-screw extruder for extrusion, and control the extrusion temperature of the twin-screw extruder to be 230-300°C and the screw rotation speed to be 400-480 rmp to complete granulation.

[0039] It should be noted that the silane coupling agent used in the embodiments of the present application is KH-570.

[0040] Meanwhile, in step 1, the surface modification treatment of wollastonite and nano-zinc oxide includes pouring wollastonite into sodium hydroxide solution and nano-zinc oxide into hydrochloric acid solution, magnetically stirring until evenly dispersed or completely dissolved, then slowly dropping the hydrochloric acid solution containing nano-zinc oxide into the sodium hydroxide solution containing wollastonite, stirring while adding until the pH of the mixed solution is 7, strongly stirring, and then successively carrying out heat preservation and static settlement for 1 h, cooling, washing, suction filtration, drying, grinding and dispersing, sieving to remove agglomerated particles, and drying to obtain wollastonite with nano-zinc oxide attached to the surface for standby; mixing absolute ethanol and deionized water according to a mass ratio of 3:5 to obtain an ethanol aqueous solution, then adding wollastonite with nano-zinc oxide attached to the surface into the ethanol aqueous solution, carrying out ultrasonic fragmentation treatment for 60 min, heating to 60 °C, stirring at 800 r / min for 2 h, waiting for the temperature to be constant after uniform stirring, then slowly and uniformly dropping an absolute ethanol solution containing 3% KH-570, cooling to room temperature after the reaction ends, washing with absolute ethanol and centrifuging with a centrifuge to take out, and drying in a vacuum drying oven to obtain MT-ZnOw; the surface modification treatment of the modified talc powder includes adding talc powder into absolute ethanol, stirring evenly at 300 r / min and heating ultrasonically to 60 °C in sequence, then adding a silane coupling agent KH-570 / stearic acid composite modifier with a mass fraction of 2% for reaction, and after the reaction ends, carrying out cooling, suction filtration and drying to obtain the modified talc powder.

[0041] An application of a water pressure resistant polyamide composite material, which includes using the water pressure resistant polyamide composite material as described above and applying it to a faucet waterway.

[0042] The composition components of Examples 1 to 5 and Comparative Examples 1 to 4 are shown in Table 1 below:

[0043]

[0044] Performance test:

[0045] 1. Using a plastic injection molding machine according to the GB standard, injection molding test specimens at 250 - 300 °C. The dimensions (length × width × thickness) of the test specimen bars are as follows: tensile specimen bar (dumbbell-shaped), 170.0 × 10.0 × 4.0; bending specimen bar, 80.0 × 10.0 × 4.0; notched impact specimen bar, 80.0 × 10.0 × 4.0, V-notch, notch depth is 1 / 5;

[0046] 2. After the test specimen bars are molded, they are placed in a standard environment with a temperature of (23 ± 2) °C and a humidity of (50 ± 5)% for 24 h and then tested. The test environment is (23 ± 2) °C and a humidity of (50 ± 5)%;

[0047] 3. Tensile strength and elongation at break: Tested according to ISO 527-1,2, tensile speed is 5 mm / min;

[0048] 4. Flexural strength: Tested according to ISO 178, with a flexural speed of 2 mm / min;

[0049] 5. Notched Izod impact strength of simply supported beam: Tested according to ISO 179 / 1eA.

[0050] The performance test results are shown in Table 2 and Table 3 below.

[0051] Table 2 Performance Test Results

[0052]

[0053] Table 3 Performance Test Results of Conventional Material, Example 5 and EMS GV-5H

[0054]

[0055]

[0056] As can be seen from Table 2 above, with the addition of MT-ZnOw, modified talc powder and toughening agent, the fracture strain and notched Izod impact strength of the water-pressure-resistant polyamide composite material prepared in the examples of this application have all increased to varying degrees. The combined action of the three components has the best effect on improving the fracture strain and notched impact strength of the composite material. At the same time, the modified talc powder, wollastonite and nano-zinc oxide are evenly dispersed in the matrix material. Under the action of external force, the lamellar layers of talc powder slide, and there is a good interfacial bonding ability between the modified inorganic minerals and the matrix material, thus improving the fracture strain of the polyamide composite material. Moreover, the nano-zinc oxide coated on the surface of wollastonite effectively solves the problem that the sharp edges and corners of wollastonite become stress concentration points.

[0057] As can be seen from Table 3 above, through the comparison results before and after soaking in water, it can be seen that the low water absorption of wollastonite provides a certain hydrolysis resistance for the polyamide composite material, and the fracture strain and notched impact strength of the material after soaking in water have both increased. It can be seen that the preparation method of the examples of this application has the effect of improving the mechanical properties to achieve water pressure resistance. At the same time, when the fracture strain and notched impact strength of the composite material before soaking in water are insufficient, continuous soaking in water later (95°C * 1000 h) cannot pass the water pressure test, while Example 5 of this application has met the requirements of the sanitary ware industry. After soaking in water at 95°C for 1000 h, it does not crack within 1 minute under a water pressure of 20 kg, and the cracking time of the water pressure test reaches 65.6 s.

[0058] In summary, the present application provides a water pressure-resistant polyamide composite material, its preparation method and application. The preparation method of the water pressure-resistant polyamide composite material has the effect of obtaining a water pressure-resistant polyamide composite material with excellent mechanical properties, making the water pressure-resistant polyamide composite material suitable for application in the bathroom industry.

[0059] Among them, by coating nano-zinc oxide on the surface of wollastonite, the sharp edges and corners of wollastonite are filled, avoiding internal stress concentration points, while maintaining the reinforcing performance of inorganic minerals and the characteristics of nano-zinc oxide, the agglomeration problem of nano-zinc oxide is solved, thereby effectively improving the interfacial strength between the filler and the polymer. And by using wollastonite as a fibrous inorganic mineral filler, due to the regular surface structure and low price of wollastonite, while replacing part of the glass fiber filled into the PA66 matrix to improve the crystallization behavior and reduce the water absorption, the cost is significantly reduced, and a water pressure-resistant polyamide composite material with effective hydrolysis resistance is obtained. At the same time, by using the silane coupling agent KH-570 to modify to obtain MT-ZnOw and talcum powder, the processing fluidity, notched impact strength and elongation rate of the polyamide composite material are effectively improved. Therefore, the water pressure-resistant polyamide composite material has the water pressure resistance performance of not cracking within 1 minute based on a water pressure test of 20 kg after soaking in water at 95 °C for 1000 h.

[0060] The "first", "second", "third", "fourth", etc. (if any) involved in the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0061] It should be noted that the descriptions involving "first", "second", etc. in the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0062] In this text, specific examples are used to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A water pressure-resistant polyamide composite material, characterized in that: It includes 23 - 48 parts by weight of PA66, 6 - 16.5 parts of copolyamide or semi-aromatic polyamide, 40 - 50 parts of glass fiber, 10 - 15 parts of inorganic mineral, 1 - 3 parts of compatibilizer, and 0.5 - 1.5 parts of auxiliary agent; wherein, the inorganic mineral is at least one of wollastonite, talcum powder, and nano-zinc oxide surface-modified by a silane coupling agent.

2. The water pressure resistant polyamide composite material according to claim 1, characterized in that: The glass fiber is short-cut high-modulus high-strength glass fiber, with a length of 3 - 5 mm and a diameter of 9 - 15 μm, and is treated with a sizing agent, and the sizing agent is PP-g-MAH or silane type.

3. The water pressure resistant polyamide composite material according to claim 1, wherein: The copolyamide is at least one of PA66 / 6T, PA6I / 6T, PA66 / 6, and the semi-aromatic polyamide is PA6I / 6T.

4. A water-resistant polyamide composite material according to claim 1, characterized in that: The auxiliary agent is an antioxidant and a lubricant; the antioxidant is at least one of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamide), 4,4'-thiobis(6-tert-butyl-3-methylphenol), cuprous iodide, potassium iodide; the lubricant is at least one of pentaerythritol stearate, calcium stearate, sodium stearate, magnesium stearate, and ethylene bisstearamide.

5. The water pressure resistant polyamide composite material according to claim 1, characterized in that: It also includes 1 - 2 parts by weight of colorant, and the colorant is black masterbatch, white masterbatch, or colored masterbatch.

6. A method for preparing a water pressure resistant polyamide composite material as described in any one of claims 1-5, characterized in that: It includes the following steps: Step 1, modification: Mix wollastonite, talcum powder, nano-zinc oxide with a silane coupling agent for reaction, and obtain modified inorganic mineral after surface modification treatment for standby; Step 2, preparation of materials: Prepare PA66, copolyamide or semi-aromatic polyamide, glass fiber, modified inorganic mineral, compatibilizer, and auxiliary agent by weight parts as standby materials for standby; Step 3, mixing: Put the standby materials into a high-speed mixer for mixing, then add silicone oil, and obtain a mixed material after mixing and stirring; Step 4, granulation: Put the mixed material into a twin-screw extruder for extrusion and granulation.

7. A method for a water pressure-resistant polyamide composite material according to claim 6, characterized in that: In Step 4, control the extrusion temperature of the twin-screw extruder to be 230 - 300 °C, and the screw rotation speed to be 400 - 480 rmp.

8. A method for a water pressure-resistant polyamide composite material according to claim 6, characterized in that: The silane coupling agent is KH-570.

9. A method for a water pressure resistant polyamide composite material according to claim 8, characterized in that: In step 1, the surface modification treatment of wollastonite and nano-zinc oxide includes pouring wollastonite into sodium hydroxide solution, pouring nano-zinc oxide into hydrochloric acid solution, magnetically stirring until evenly dispersed or completely dissolved, then slowly dropping the hydrochloric acid solution containing dissolved nano-zinc oxide into the sodium hydroxide solution containing wollastonite, stirring while adding until the pH of the mixed solution is 7, and after strong stirring, successively carrying out heat preservation and standing for 1 h, cooling, washing, suction filtration, drying, grinding and dispersing, sieving to remove agglomerated particles, and obtaining wollastonite with nano-zinc oxide attached to the surface for standby; mixing absolute ethanol and deionized water in a mass ratio of 3:5 to obtain an ethanol aqueous solution, then adding wollastonite with nano-zinc oxide attached to the surface into the ethanol aqueous solution, heating to 60 °C after ultrasonic fragmentation treatment for 60 min, stirring at 800 r / min for 2 h, waiting for the temperature to be constant after uniform stirring, then slowly and uniformly dropping an absolute ethanol solution containing 3% KH-570, cooling to room temperature after the reaction ends, taking out by washing with absolute ethanol and centrifuging with a centrifuge, and obtaining MT-ZnOw after drying in a vacuum drying oven; the surface modification treatment of the modified talc powder includes adding talc powder into absolute ethanol, stirring evenly at 300 r / min and heating ultrasonically to 60 °C in sequence, then adding a silane coupling agent KH-570 / stearic acid composite modifier with a mass fraction of 2% for reaction, and after the reaction ends, carrying out cooling, suction filtration, and drying to obtain the modified talc powder.

10. Application of a water pressure-resistant polyamide composite material, characterized in that: It includes using the water pressure resistant polyamide composite material as described in any one of claims 1-8 and applying it to the faucet water channel.

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