High toughness and high strength polyethylene color master batch and preparation method thereof

Abstract

This invention discloses a high-toughness, high-strength polyethylene masterbatch and its preparation method. The polyethylene masterbatch is prepared from polyethylene resin, carbon quantum dots, thermoplastic polyurethane elastomer, compatibilizer, antioxidant, and pigment in a specific ratio. The preparation method of the polyethylene masterbatch is as follows: S1, mixing polyethylene resin, carbon quantum dots, thermoplastic polyurethane elastomer, compatibilizer, antioxidant, lubricant, and pigment uniformly to obtain a mixture; S2, adding the mixture to a twin-screw extruder for extrusion granulation to obtain the high-toughness, high-strength polyethylene masterbatch. This polyethylene masterbatch possesses excellent mechanical properties, high-temperature resistance, and aging resistance, especially good toughness and strength, which can effectively improve the service life of produced polyethylene pipes and reduce the production cost of polyethylene pipe fittings.

Description

Technical Field

[0001] This invention relates to the field of polyethylene pipe fittings production technology, specifically to a high-toughness, high-strength polyethylene masterbatch and its preparation method. Background Technology

[0002] Pipe fittings are a general term for components in a pipeline system that serve functions such as connection, control, direction change, flow diversion, sealing, and support. Currently, most buried pipelines used in municipal engineering projects such as water supply and gas supply are made of polyethylene, requiring a large number of pipe fittings to connect these pipelines. To ensure the safe and reliable use of the pipelines, the performance requirements for pipe fittings are relatively high, especially the requirements for their toughness and strength.

[0003] To reduce costs and increase the strength of polyethylene pipe fittings, fillers such as calcium carbonate and talc are often added in varying amounts. This reduces the impact toughness of the produced polyethylene pipe fittings, making them prone to cracking and damage, severely impacting the service life of municipal polyethylene pipeline systems. Simultaneously, the low toughness of polyethylene pipe fittings is often addressed by increasing their thickness to improve toughness and ensure a longer service life. This increases the cost of polyethylene pipe fittings and hinders the company's high-quality development goals of cost reduction and efficiency improvement. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a high-toughness and high-strength polyethylene masterbatch and its preparation method. The polyethylene masterbatch has good mechanical properties, high temperature resistance, and aging resistance, especially good toughness and strength, which can effectively improve the service life of the produced polyethylene pipes and reduce the production cost of polyethylene pipe fittings.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this invention is as follows:

[0006] A high-toughness, high-strength polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0007]

[0008]

[0009] Furthermore, the method for preparing the carbon quantum dots is as follows:

[0010] 1) Crush the rice straw with a pulverizer, then wash the rice straw powder with anhydrous ethanol, and then dry it;

[0011] 2) Take the dried rice straw powder and put it into a muffle furnace, and calcine it in an air atmosphere at 400-500℃ for 60-90 minutes;

[0012] 3) The calcined solid was added to distilled water and subjected to ultrasonic vibration. The mixture was then filtered through a filter membrane to obtain a carbon quantum dot solution, which was then dried to obtain the carbon quantum dots.

[0013] Furthermore, the compatibilizer is at least one of maleic anhydride-grafted POE, maleic anhydride-grafted PE, and maleic anhydride-grafted polypropylene.

[0014] Furthermore, the antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0015] Furthermore, the lubricant is at least one of zinc stearate, fatty acid amide, polyethylene wax, and silicone powder.

[0016] Furthermore, the pigment is at least one of titanium dioxide, pigment orange 13, ultramarine, and carbon black.

[0017] A method for preparing a high-toughness, high-strength polyethylene masterbatch includes the following steps:

[0018] S1. Mix polyethylene resin, carbon quantum dots, thermoplastic polyurethane elastomer, compatibilizer, antioxidant, lubricant, and pigment evenly to obtain a mixture.

[0019] S2. Add the mixture to a twin-screw extruder, extrude and granulate to obtain the high-toughness and high-strength polyethylene masterbatch.

[0020] Furthermore, the processing temperature of the twin-screw extruder barrel is 170-190℃, with zone one at 170-180℃, zone two at 175-185℃, zone three at 180-190℃, zone four at 180-190℃, and zone five at 170-180℃. Compared with the prior art, the advantages and beneficial effects of this invention are as follows:

[0021] 1. This invention utilizes carbon quantum dots and thermoplastic polyurethane elastomers to synergistically enhance the toughness of polyethylene masterbatch, significantly improving the toughness of the prepared polyethylene pipe fittings and thus extending their lifespan. Furthermore, the high toughness of the polyethylene masterbatch allows for a reduction in the thickness of the prepared polyolefin pipe fittings, thereby lowering production costs.

[0022] 2. Carbon quantum dots are added to the polyolefin masterbatch of the present invention, which gives the prepared polyolefin pipe fittings good anti-aging properties.

[0023] 3. This invention uses carbon quantum dots prepared from agricultural waste rice straw as a toughening and reinforcing agent. The price of carbon quantum dots is low, which further reduces the preparation cost of polyolefin masterbatch. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments, but these embodiments are not to be construed as limiting the scope of protection of the present invention in any sense.

[0025] The methods for preparing carbon quantum dots used in the following examples and comparative examples are as follows:

[0026] 1. Crush the rice straw with a shredder, then wash it three times with anhydrous ethanol, and then dry it.

[0027] 2. Place the straw powder obtained in step 1 into a muffle furnace and calcine it at 450°C in air for 75 minutes;

[0028] 3. Add the calcined solid to distilled water, then sonicate, and then filter through a 0.22 μm filter membrane to obtain a carbon quantum dot solution. Freeze-dry to obtain carbon quantum dots.

[0029] Example 1

[0030] A high-toughness, high-strength polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0031]

[0032] The preparation method of the above-mentioned high-toughness and high-strength polyethylene masterbatch is as follows:

[0033] 1. Mix polyethylene resin, carbon quantum dots, thermoplastic polyurethane elastomer, maleic anhydride-grafted PE, antioxidant 1010, antioxidant 168, zinc stearate, polyethylene wax and carbon black evenly to obtain a mixture.

[0034] 2. Add the mixture to a twin-screw extruder, set the extruder current to 80A, and set the barrel temperature to 175℃ in zone 1, 180℃ in zone 2, 185℃ in zone 3, 185℃ in zone 4, and 175℃ in zone 5. Extrude and granulate to obtain the high-toughness and high-strength polyethylene masterbatch.

[0035] Example 2

[0036] A high-toughness, high-strength polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0037]

[0038] The preparation method of the high-toughness and high-strength polyethylene masterbatch in this embodiment is the same as that in Example 1.

[0039] Example 3

[0040] A high-toughness, high-strength polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0041]

[0042] The preparation method of the high-toughness and high-strength polyethylene masterbatch in this embodiment is the same as that in Example 1.

[0043] Comparative Example 1

[0044] A polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0045]

[0046] The preparation method of the polyethylene masterbatch in this comparative example is the same as that in Example 1.

[0047] Comparative Example 2

[0048] A polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0049]

[0050] The preparation method of the polyethylene masterbatch in this comparative example is the same as that in Example 1.

[0051] Comparative Example 3

[0052] A polyethylene masterbatch is prepared from the following raw materials in parts by weight:

[0053]

[0054]

[0055] The preparation method of the polyethylene masterbatch in this comparative example is the same as that in Example 1.

[0056] The impact strength, tensile strength, and aging resistance of the polyethylene masterbatches prepared in Examples 1-3 and Comparative Examples 1-3 were tested, and the results are shown in the table below:

[0057]

Claims

1. A high-toughness, high-strength polyethylene masterbatch, characterized in that... It is prepared from the following raw materials in parts by weight: 100 parts of polyethylene resin 3-8 parts of carbon quantum dots 2-5 parts of thermoplastic polyurethane elastomer 1-3 parts compatibilizer Antioxidant 0.1-1 part 1-2 parts lubricant 6-15 parts pigment; The preparation method of the carbon quantum dots is as follows: 1) Crush the rice straw with a pulverizer, then wash the rice straw powder with anhydrous ethanol, and then dry it; 2) Place the dried rice straw powder into a muffle furnace and calcine it at 400-500℃ in an air atmosphere for 60-90 minutes; 3) Add the calcined solid to distilled water and sonicate. Filter the mixture after sonication through a filter membrane to obtain a carbon quantum dot solution. Dry the solution to obtain the carbon quantum dots.

2. The high-toughness, high-strength polyethylene masterbatch according to claim 1, characterized in that: The compatibilizer is at least one of maleic anhydride-grafted POE, maleic anhydride-grafted PE, and maleic anhydride-grafted polypropylene.

3. The high-toughness, high-strength polyethylene masterbatch according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

4. The high-toughness, high-strength polyethylene masterbatch according to claim 1, characterized in that: The lubricant is at least one of zinc stearate, fatty acid amide, polyethylene wax, and silicone powder.

5. The high-toughness, high-strength polyethylene masterbatch according to claim 1, characterized in that: The pigment is at least one of titanium dioxide, pigment orange 13, ultramarine, and carbon black.

6. A method for preparing the high-toughness, high-strength polyethylene masterbatch according to claim 1, characterized in that... Includes the following steps: S1. Mix polyethylene resin, carbon quantum dots, thermoplastic polyurethane elastomer, compatibilizer, antioxidant, lubricant, and pigment evenly to obtain a mixture. S2. Add the mixture to a twin-screw extruder, extrude and granulate to obtain the high-toughness and high-strength polyethylene masterbatch.

7. The method for preparing high-toughness and high-strength polyethylene masterbatch according to claim 6, characterized in that: The processing temperature of the twin-screw extruder barrel is 170-190℃, with the temperature in zone one being 170-180℃, zone two being 175-185℃, zone three being 180-190℃, zone four being 180-190℃, and zone five being 170-180℃.

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