Nylon suitable for sheet extrusion and preparation method thereof

Abstract

The invention belongs to the field of high polymer materials, and particularly relates to nylon suitable for sheet extrusion and a preparation method and application thereof. The nylon suitable for sheet extrusion comprises the following components in parts by mass: 60-80 parts of nylon matrix resin, 10-20 parts of a filler composition, and 10-20 parts of a compatilizer and an auxiliary agent. The prepared nylon particles can be used for preparing flaky nylon products, and the products can be processed into complex shapes by cutting, stamping, welding, bending and the like, so that the nylon particles are suitable for batch production or customized parts; by adjusting the forming process of the sheet, the molecular chain orientation can be controlled, so that the material shows specific mechanical properties (such as longitudinal high strength and transverse high flexibility) in different directions, and the requirements of complex scenes are met.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials, specifically relating to a nylon suitable for sheet extrusion and its preparation method. Background Technology

[0002] Nylon is currently the most in-demand engineering plastic, widely used in numerous fields such as automotive, textiles, and medical due to its excellent mechanical properties, wear resistance, and chemical corrosion resistance. Currently, nylon processing in the market is mainly injection molding, while extruded nylon is commonly used in door and window components. However, sheet-like nylons suitable for sheet extrusion have not yet been found. Therefore, developing a nylon suitable for sheet extrusion is crucial. Summary of the Invention

[0003] The purpose of this invention is to overcome the deficiencies in the prior art and provide a nylon suitable for sheet extrusion, its preparation method, and its application.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A nylon suitable for sheet extrusion, wherein the nylon melt index is 1-8 g / 10 min; comprising the following components in parts by weight: 60-80 parts of nylon matrix resin, 10-30 parts of filler composition, and 10-20 parts of compatibilizer and additives.

[0006] For sheet nylon used in extrusion, the core parameter is the melt index. If the melt index is high, the nylon has good flowability and cannot be shaped into a sheet structure after passing through the die; if the melt index is low, the nylon has poor flowability and is difficult to extrude, making it impossible to obtain the ideal sheet structure. Therefore, the melt index of the nylon prepared in this invention is required to be 1-8 g / 10 min.

[0007] To achieve the above technical objectives, the following solutions should be adopted:

[0008] The nylon matrix resin is nylon 6 or nylon 66; preferably, the relative viscosity of the nylon matrix resin is 2.7-4.2.

[0009] The compatibilizer is a reactive compatibilizer, more preferably one or more of maleic anhydride-grafted low-density polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted POE, and maleic anhydride-grafted rubber.

[0010] The filler composition is one or more of calcium carbonate, talc, and inorganic crystals; preferably, the calcium carbonate has a mesh size of 500-2000 mesh; the talc has a mesh size of 1000-2000 mesh; and the inorganic crystals consist of short-cut glass fibers with surface-grafted nano-carbon and inorganic whiskers with surface-grafted nano-carbon.

[0011] The additives are antioxidants and release agents; preferably, the mass of the release agent is 0.2-0.5 wt% of the total mass of the matrix resin, filler and compatibilizer; preferably, the release agent is a silicone masterbatch.

[0012] The antioxidant is 0.1-0.5 wt% of the total mass of the matrix resin, filler, and compatibilizer; preferably, the antioxidant is antioxidant 1098.

[0013] The present invention also includes a method for preparing the nylon suitable for sheet extrusion, comprising the following steps:

[0014] Step 1: Dry the base nylon resin in an oven at 80-100℃ for 4-6 hours to remove moisture from the nylon resin;

[0015] Step 2: Accurately weigh the base nylon resin, filler composition, compatibilizer and additives, mix them evenly in a high-speed mixer, and add them to a twin-screw extruder for melt blending; the base nylon resin is nylon 6 and the extrusion temperature is 230℃±10℃, the base nylon resin is nylon 66 and the extrusion temperature is 260℃±10℃, and the main extruder speed is 400rpm.

[0016] Step 3: After the extruded nylon is cooled and shaped by water, nylon particles suitable for extruding sheets are obtained.

[0017] Compared with the prior art, the beneficial effects of the present invention are: good processing performance: the nylon particles prepared by the present invention can be used to prepare sheet nylon products, which can be processed into complex shapes by cutting, stamping, welding, bending and other methods, and are suitable for mass production or customized parts. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the preferred embodiments.

[0019] Example 1: A method for preparing nylon suitable for sheet extrusion, comprising the following steps:

[0020] Step 1: Dry 80 kg of nylon 6 resin (viscosity 2.7) in an oven at 100℃ for 4 hours to remove moisture from the resin.

[0021] Step 2: Accurately weigh 10 kg of calcium carbonate (500 mesh), 10 kg of maleic anhydride-grafted polypropylene (grafting rate 1%), 0.5 kg of silicone masterbatch, and 0.5 kg of antioxidant 1098, mix them evenly in a high-speed mixer, and extrude them in a twin-screw extruder at an extrusion temperature of 230℃ and a screw speed of 400 rpm.

[0022] Step 3: After cooling with cooling water and pelletizing, nylon particles are obtained.

[0023] The melt index of the obtained particles, the mechanical properties of the injection-molded specimens, and the sheet forming condition after re-extrusion are shown in Table 1.

[0024] Example 2: A method for preparing nylon suitable for sheet extrusion, comprising the following steps:

[0025] Step 1: Dry 65 kg of nylon 6 resin (viscosity 3.2) in an oven at 100℃ for 4 hours to remove moisture from the resin.

[0026] Step 2: Accurately weigh 15 kg of calcium carbonate (500 mesh), 20 kg of maleic anhydride-grafted POE (grafting rate 1%), 0.5 kg of silicone masterbatch, and 0.5 kg of antioxidant 1098, mix them evenly in a high-speed mixer, and extrude them in a twin-screw extruder at an extrusion temperature of 230℃ and a screw speed of 400 rpm.

[0027] Step 3: After cooling with cooling water and pelletizing, nylon particles are obtained.

[0028] The melt index of the obtained particles, the mechanical properties of the injection-molded specimens, and the sheet forming condition after re-extrusion are shown in Table 1.

[0029] Example 3: A method for preparing nylon suitable for sheet extrusion, comprising the following steps:

[0030] Step 1: Dry 60 kg of nylon 66 resin (viscosity 4.2) in an oven at 100℃ for 4 hours to remove moisture from the resin.

[0031] Step 2: Accurately weigh 20kg of talc powder (2000 mesh), 20kg of maleic anhydride grafted rubber (grafting rate 0.8%), 0.5kg of silicone masterbatch, and 0.5kg of antioxidant 1098, mix them evenly in a high-speed mixer, and extrude them in a twin-screw extruder at an extrusion temperature of 260℃ and a screw speed of 400rpm.

[0032] Step 3: After cooling with cooling water and pelletizing, nylon particles are obtained.

[0033] The melt index of the obtained particles, the mechanical properties of the injection-molded specimens, and the sheet forming condition after re-extrusion are shown in Table 1.

[0034] Example 4: A method for preparing nylon suitable for sheet extrusion, comprising the following steps:

[0035] Step 1: Dry 65kg of nylon 66 resin (viscosity 2.7) in an oven at 100℃ for 4 hours to remove moisture from the resin.

[0036] Step 2: Accurately weigh 15 kg of inorganic crystals (short-cut glass fibers and inorganic whiskers grafted with nano-carbon, commercially available products), 20 kg of maleic anhydride-grafted polyethylene (grafting rate 0.9%), 0.5 kg of silicone masterbatch, and 0.5 kg of antioxidant 1098. Mix them evenly in a high-speed mixer, and extrude the mixture in a twin-screw extruder at a temperature of 260℃ and a screw speed of 400 rpm.

[0037] Step 3: After cooling with cooling water and pelletizing, nylon particles are obtained.

[0038] The melt index of the obtained particles, the mechanical properties of the injection-molded specimens, and the sheet forming condition after re-extrusion are shown in Table 1.

[0039] Comparative Example 1: A method for preparing a nylon composite material, comprising the following steps:

[0040] Step 1: 100 kg of nylon 6 chips (viscosity 2.7) were dried to remove moisture, then mixed at high speed with 0.5 kg of silicone masterbatch and 0.5 kg of antioxidant 1098. The mixture was then fed into a twin-screw extruder and extruded at 230℃ and 400 rpm. After cooling with cooling water and pelletizing, nylon particles were obtained. Due to its high melt index and good flowability, nylon could not be molded into sheet-like structures. The mechanical properties of the injection-molded samples are shown in Table 1.

[0041] Table 1 Melt flow index, mechanical properties of the samples, and sheet forming conditions

[0042]

[0043] The method described in this application involves adjusting the nylon formulation to control its melt index within the range of 1-8 g / 10 min. The resulting nylon has moderate fluidity, avoiding the inability to form a sheet structure due to excessive fluidity, and also avoiding extrusion difficulties due to poor fluidity.

[0044] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A type of nylon suitable for sheet extrusion, characterized in that, The nylon has a melt flow index of 1-8 g / 10 min and comprises the following components in parts by weight: 60-80 parts of nylon matrix resin, 10-20 parts of filler composition, and 10-20 parts of compatibilizer and additives.

2. The nylon suitable for sheet extrusion according to claim 1, characterized in that, The nylon matrix resin is nylon 6 or nylon 66; preferably, the relative viscosity of the nylon matrix resin is 2.7-4.

2.

3. The nylon suitable for sheet extrusion according to claim 1, characterized in that, The compatibilizer is a reactive compatibilizer, more preferably one or more of maleic anhydride-grafted low-density polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted POE, and maleic anhydride-grafted rubber.

4. The nylon suitable for sheet extrusion according to claim 1, characterized in that, The filler composition is one or more of calcium carbonate, talc, and inorganic crystals; preferably, the calcium carbonate has a mesh size of 500-2000 mesh; the talc has a mesh size of 1000-2000 mesh; and the inorganic crystals consist of short-cut glass fibers with surface-grafted nano-carbon and inorganic whiskers with surface-grafted nano-carbon.

5. The nylon suitable for sheet extrusion according to claim 1, characterized in that, The additives are antioxidants and release agents; preferably, the mass of the release agent is 0.2-0.5 wt% of the total mass of the matrix resin, filler and compatibilizer; more preferably, it is 0.5%; preferably, the release agent is a silicone masterbatch.

6. The nylon suitable for sheet extrusion according to claim 5, characterized in that, The antioxidant is 0.1-0.5 wt% of the total mass of the matrix resin, filler and compatibilizer; preferably 0.5%, and more preferably, the antioxidant is antioxidant 1098.

7. The nylon suitable for sheet extrusion according to claim 1, characterized in that, The melt flow index of the nylon is 1.2-4.7 g / 10 min.

8. A method for preparing nylon suitable for sheet extrusion as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Dry the base nylon resin in an oven at 80-100℃ for 4-6 hours to remove moisture from the nylon resin; Step 2: Accurately weigh the base nylon resin, filler composition, compatibilizer and additives, mix them evenly in a high-speed mixer, and add them to a twin-screw extruder for melt blending; the base nylon resin is nylon 6 and the extrusion temperature is 230℃±10℃, the base nylon resin is nylon 66 and the extrusion temperature is 260℃±10℃, and the main extruder speed is 400rpm. Step 3: After the extruded nylon is cooled and shaped by water, nylon particles suitable for extruding sheets are obtained.

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