High-strength anti-static nylon composite material and preparation process thereof

Abstract

The invention discloses a high-strength anti-static nylon composite material which comprises the following components in parts by weight: 80-120 parts of PA6 resin; 8 to 14 parts of glass fiber; 10 to 20 parts of polyvinyl alcohol fiber; 2-8 parts of kaolin; 6-9 parts of sodium benzoate; 0.1-10 parts of an impregnating compound; 0.1-10 parts of a dispersant; and 0.01 to 1 part of an antioxidant. The glass fiber is added into the PA6 resin for modification, meanwhile, the polyvinyl alcohol fiber is used for preventing static electricity, the kaolin is used for improving the strength and reinforcing nylon, and the performance is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon materials, and in particular relates to a high-strength antistatic nylon composite material and a preparation process thereof. Background Art

[0002] Nylon 66 is a widely used engineering plastic, which is made by polycondensation of hexamethylenediamine and adipic acid. The amide groups on its molecular chain are polar and easy to form hydrogen bonds, so it has excellent mechanical properties, such as high strength, high modulus, high hardness, etc. In addition, it also exhibits excellent creep resistance, wear resistance and noise reduction. However, due to its special structure, its water absorption rate is high, resulting in poor dimensional stability, which also reduces its wear resistance and heat resistance. Nylon 66 can be modified to improve its shortcomings and greatly improve its performance.

[0003] The modification of nylon 66 can be roughly divided into physical modification and chemical modification. Chemical modification is to introduce new polymers, structural units or functional groups into the molecular chain of nylon 66 to change its structure and performance. Physical modification is to add other fillers, such as organic materials, inorganic materials, rubber varieties, thermoplastic elastomers, other plastic varieties, or some additives, into the nylon 66 matrix to produce nylon 66 modified materials with outstanding performance through mixing and kneading.

[0004] At present, most reinforced nylon synthetic plastics are reinforced with glass fibers. The resulting materials have high density, insufficient strength improvement, and no antistatic effect.

[0005] Therefore, further improvement and optimization are needed in reinforcing nylon. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a high-strength antistatic nylon composite material and a preparation process thereof, so as to avoid the problem that the strength and antistatic properties of nylon are poor after being modified by adding glass fiber.

[0007] In order to solve the above technical problems, the present invention discloses a high-strength antistatic nylon composite material, which comprises, by weight: 80-120 parts of PA6 resin; 8-14 parts of glass fiber; 10-20 parts of polyvinyl alcohol fiber; 2-8 parts of kaolin; Sodium benzoate 6-9 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part.

[0008] According to one embodiment of the present invention, the invention comprises, by weight: 80 parts of PA6 resin; 8 parts of glass fiber; 10 parts of polyvinyl alcohol fiber; 2 parts of kaolin; 6 parts of sodium benzoate; Wetting agent 0.1 part; Dispersant 0.1 part; Antioxidant 0.01 parts.

[0009] According to one embodiment of the present invention, the composition comprises, by weight: 120 parts of PA6 resin; Glass fiber 14 parts; 20 parts of polyvinyl alcohol fiber; 8 parts of kaolin; Sodium benzoate 9 parts; 10 parts of wetting agent; Dispersant 10 parts; 1 part antioxidant.

[0010] According to one embodiment of the present invention, the composition comprises, by weight: PA6 resin 100 parts; Glass fiber 11 parts; 15 parts of polyvinyl alcohol fiber; 5 parts of kaolin; 7.5 parts of sodium benzoate; 5.2 parts of wetting agent; Dispersant 5.1 parts; 0.5 parts of antioxidant.

[0011] The present invention also discloses a preparation process of a high-strength antistatic nylon composite material, comprising: Step a. Weigh PA6 resin, glass fiber and polyvinyl alcohol fiber in parts by weight and put them into a reactor, keep them at 75°C for 30 minutes, and stir them at 130 r / min; Step b. Heat the temperature in the kettle from 75°C to 210°C within 90 minutes, add kaolin, sodium benzoate, impregnating agent, dispersant and antioxidant, and start to release the pressure after the pressure in the kettle rises to 1.8-2.0MPa, then heat to 230°C and keep warm for 30 minutes; Step c. Slowly open the vacuum system to gradually reduce the pressure in the kettle to -0.05MPa, and discharge the material after maintaining it for 30 minutes; Step d. The material is fed into a twin-screw extruder, and the temperature of each section is controlled to be 240, 245, 245, 245, 250, 250, 250, 255, 255, 260, 260, and the speed is 300-450rpm / HZ; after mixed extrusion, it is water-cooled, air-cooled, blow-dried, and pelletized to obtain wet slices; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 150°C for 36 hours to obtain a finished product.

[0012] Compared with the prior art, the present invention can achieve the following technical effects: The performance of PA6 resin is greatly improved by adding glass fiber to modify it, using polyvinyl alcohol fiber to prevent static electricity, kaolin to increase strength, and reinforcing nylon.

[0013] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time. DETAILED DESCRIPTION

[0014] The following will describe the implementation methods of the present invention in detail with reference to examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0015] The invention discloses a high-strength antistatic nylon composite material, which comprises, by weight: 80-120 parts of PA6 resin; 8-14 parts of glass fiber; 10-20 parts of polyvinyl alcohol fiber; 2-8 parts of kaolin; Sodium benzoate 6-9 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part. Example 1

[0016] A preparation process of a high-strength antistatic nylon composite material, comprising: Step a. Weigh 80 parts of PA6 resin, 8 parts of glass fiber, and 10 parts of polyvinyl alcohol fiber by weight; put them into a reactor, keep them at 75°C for 30 minutes, and stir them at 130 r / min; Step b. Heat the temperature in the kettle from 75°C to 210°C within 90 minutes, add 2 parts of kaolin, 6 parts of sodium benzoate, 0.1 parts of a wetting agent, 0.1 parts of a dispersant, and 0.01 parts of an antioxidant, and after the pressure in the kettle rises to 1.8-2.0MPa, start timing for 120 minutes, then start to release the pressure, and allow the pressure in the kettle to drop to normal pressure after 30 minutes, then raise the temperature to 230°C and keep warm for 30 minutes; Step c. Slowly open the vacuum system to gradually reduce the pressure in the kettle to -0.05MPa, and discharge the material after maintaining it for 30 minutes; Step d. The material is fed into a twin-screw extruder, and the temperature of each section is controlled to be 240, 245, 245, 245, 250, 250, 250, 255, 255, 260, 260, and the speed is 300-450rpm / HZ; after mixed extrusion, it is water-cooled, air-cooled, blow-dried, and pelletized to obtain wet slices; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 150°C for 36 hours to obtain a finished product. Example 2

[0017] Step a. Weigh 120 parts of PA6 resin, 14 parts of glass fiber, and 20 parts of polyvinyl alcohol fiber by weight; put them into a reactor, keep them at 75°C for 30 minutes, and stir them at 130 r / min; Step b. Heat the temperature in the kettle from 75°C to 210°C within 90 minutes, add 8 parts of kaolin, 9 parts of sodium benzoate, 10 parts of wetting agent, 10 parts of dispersant, and 1 part of antioxidant, and after the pressure in the kettle rises to 1.8-2.0MPa, count for 120 minutes, then start to release the pressure, so that the pressure in the kettle drops to normal pressure after 30 minutes, then heat it to 230°C and keep it warm for 30 minutes; Step c. Slowly open the vacuum system to gradually reduce the pressure in the kettle to -0.05MPa, and discharge the material after maintaining it for 30 minutes; Step d. The material is fed into a twin-screw extruder, and the temperature of each section is controlled to be 240, 245, 245, 245, 250, 250, 250, 255, 255, 260, 260, and the speed is 300-450rpm / HZ; after mixed extrusion, it is water-cooled, air-cooled, blow-dried, and pelletized to obtain wet slices; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 150°C for 36 hours to obtain a finished product. Example 3

[0018] Step a. Weigh 100 parts of PA6 resin, 11 parts of glass fiber, and 15 parts of polyvinyl alcohol fiber by weight, put them into a reactor, keep them at 75°C for 30 minutes, and stir them at 130 r / min. Step b. Heat the temperature in the kettle from 75°C to 210°C within 90 minutes, add 5 parts of kaolin, 7.5 parts of sodium benzoate, 5.2 parts of wetting agent, 5.1 parts of dispersant, and 0.5 parts of antioxidant, and after the pressure in the kettle rises to 1.8-2.0MPa, count for 120 minutes, then start to release the pressure, so that the pressure in the kettle drops to normal pressure after 30 minutes, and then heat it to 230°C and keep it warm for 30 minutes; Step c. Slowly open the vacuum system to gradually reduce the pressure in the kettle to -0.05MPa, and discharge the material after maintaining it for 30 minutes; Step d. The material is fed into a twin-screw extruder, and the temperature of each section is controlled to be 240, 245, 245, 245, 250, 250, 250, 255, 255, 260, 260, and the speed is 300-450rpm / HZ; after mixed extrusion, it is water-cooled, air-cooled, blow-dried, and pelletized to obtain wet slices; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 150°C for 36 hours to obtain a finished product.

[0019] It was measured that the yield strength of the nylon finished product of Example 1 was 90 MPa, that of Example 2 was 88 MPa, and that of Example 3 was 100 MPa. When the surface electrostatic voltage of the nylon finished products of Examples 1-3 was measured using an instrument such as a voltmeter or a potentiometer, the electrostatic voltage of Example 3 was 0, so the enhanced nylon performance of Example 3 was the greatest.

[0020] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A high-strength antistatic nylon composite material, characterized in that: Included by weight: 80-120 parts of PA6 resin; Glass fiber 8-14 parts; 10-20 parts of polyvinyl alcohol fiber; 2-8 parts of kaolin; Sodium benzoate 6-9 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part.

2. The high-strength antistatic nylon composite material according to claim 1, characterized in that: Included by weight: 80 parts of PA6 resin; 8 parts of glass fiber; 10 parts of polyvinyl alcohol fiber; 2 parts of kaolin; 6 parts of sodium benzoate; Wetting agent 0.1 part; Dispersant 0.1 part; Antioxidant 0.01 parts.

3. The high-strength antistatic nylon composite material according to claim 1, characterized in that: Included by weight: 120 parts of PA6 resin; Glass fiber 14 parts; 20 parts of polyvinyl alcohol fiber; 8 parts of kaolin; Sodium benzoate 9 parts; 10 parts of wetting agent; Dispersant 10 parts; 1 part antioxidant.

4. The high-strength antistatic nylon composite material according to claim 1, characterized in that: Included by weight: PA6 resin 100 parts; Glass fiber 11 parts; 15 parts of polyvinyl alcohol fiber; 5 parts of kaolin; 7.5 parts of sodium benzoate; 5.2 parts of wetting agent; Dispersant 5.1 parts; 0.5 parts of antioxidant.

5. A process for preparing the high-strength antistatic nylon composite material according to claim 1, characterized in that: include: Step a. Weigh PA6 resin, glass fiber and polyvinyl alcohol fiber in parts by weight and put them into a reactor, keep them at 75°C for 30 minutes, and stir them at 130 r / min; Step b. Heat the temperature in the kettle from 75°C to 210°C within 90 minutes, add kaolin, sodium benzoate, impregnating agent, dispersant and antioxidant, and start timing for 120 minutes after the pressure in the kettle rises to 1.8-2.0MPa, then start to release the pressure, so that the pressure in the kettle drops to normal pressure after 30 minutes, then heat it to 230°C and keep it warm for 30 minutes; Step c. Slowly open the vacuum system to gradually reduce the pressure in the kettle to -0.05MPa, and discharge the material after maintaining it for 30 minutes; Step d. The material is fed into a twin-screw extruder, and the temperature of each section is controlled to be 240, 245, 245, 245, 250, 250, 250, 255, 255, 260, 260, and the speed is 300-450rpm / HZ; after mixed extrusion, it is water-cooled, air-cooled, blow-dried, and pelletized to obtain wet slices; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 150°C for 36 hours to obtain a finished product.