High-impact-resistance and high-strength PE water supply pipe and preparation method thereof

Abstract

The invention belongs to the technical field of pipe preparation, and particularly relates to a high-impact-resistance and high-strength PE water supply pipe and a preparation method thereof. Comprising the following components in parts by weight: 100 to 104 parts of polyethylene resin, 2 to 4 parts of carbon black, 0.1 to 0.2 part of an antioxidant, 2 to 3 parts of polyamide wax micro powder, 0.1 to 0.2 part of a 1-coupling agent, 0.8 to 1 part of tris (nonylphenyl) phosphite, 1 to 1.5 parts of calcium fluoride, 1 to 1.5 parts of octyl epoxy stearate and 3 to 6 parts of a performance additive. The performance additive is prepared from the following raw materials in parts by weight: 40 to 45 parts of medium density polyethylene, 18 to 20 parts of polyphthalamide, 1 to 2 parts of aluminum nitride, 1 to 2 parts of bentonite grease, 0.1 to 0.2 part of calcium peroxide, 1 to 2 parts of 2-coupling agent, 0.5 to 0.8 part of microcrystalline cellulose, 0.1 to 0.2 part of nano toughening agent and 0.1 to 0.2 part of compatilizer. The water supply pipe is good in surface smoothness and high in scratch resistance and impact resistance, the friction coefficient between the PE water supply pipe and the ground in the dragging process is effectively reduced, and the product is high in toughness, corrosion resistance, oxidation resistance and impact resistance.

Description

Technical field:

[0001] The invention belongs to the technical field of pipe preparation, and in particular relates to a high-impact-resistant and high-strength PE water supply pipe and a preparation method thereof. Background technology:

[0002] PE (polyethylene) material is widely used in the field of water pipe manufacturing due to its high strength, high temperature resistance, corrosion resistance, and non-toxicity. Because it will not rust, it is an ideal pipe to replace ordinary iron water pipes; polyethylene is a non-inert material. Except for a small amount of strong oxidants, it can withstand corrosion from a variety of chemicals and is not easy to breed bacteria. It is well known that the reason why steel pipes and cast iron pipes are replaced by plastic pipes is not only because plastic pipes have lower water delivery energy consumption, lower living energy consumption, lighter weight, less water flow resistance, simple and quick installation, low cost, long life, and heat preservation function, but also because plastic pipes are better than steel pipes and cast iron pipes in corrosion resistance and not easy to breed microorganisms.

[0003] Water supply pipes, as pipes for pipe networks, are suitable for domestic water supply and drainage, chemical industry, sewage discharge, water plant renovation, national water conservancy projects and other fields. Taking polyethylene as the resin component of the water supply pipe, the polyethylene pipe obtained has the characteristics of non-toxic material, light weight, not easy to scale and rust in long-term use, smooth inner wall of the pipe, no change over time, and can maintain good water quality for a long time. In order to meet various environmental requirements, people's requirements for the mechanical properties of polyethylene water supply pipes are gradually increasing. Therefore, we propose a high-impact and high-strength polyethylene water supply pipe and its preparation method. Summary of the invention:

[0004] The purpose of the present invention is to provide a high-impact and high-strength PE water supply pipe and a preparation method thereof.

[0005] The present invention is achieved in that:

[0006] A high-impact and high-strength PE water supply pipe, comprising the following components in parts by weight: 100-104 parts of polyethylene resin, 2-4 parts of carbon black, 0.1-0.2 parts of antioxidant, 2-3 parts of polyamide wax micropowder, 0.1-0.2 parts of 1-coupling agent, 0.8-1 parts of trinonylphenyl phosphite, 1-1.5 parts of calcium fluoride, 1-1.5 parts of octyl epoxy stearate, and 3-6 parts of modification aid;

[0007] The modification aid is composed of the following raw materials in parts by weight: 40-45 parts of medium-density polyethylene, 18-20 parts of polyphthalamide, 1-2 parts of aluminum nitride, 1-2 parts of bentonite grease, 0.1-0.2 parts of calcium peroxide, 1-2 parts of 2-coupling agent, 0.5-0.8 parts of microcrystalline cellulose, 0.1-0.2 parts of nano toughening agent, and 0.1-0.2 parts of compatibilizer.

[0008] Furthermore, the polyethylene resin is a high-density polyethylene: YGH041, with a melt mass flow rate (MFR) of 0.4 g / 10 min (190° C. 5 kg), which is sourced from Sinopec Shanghai Petrochemical Co., Ltd.; the medium-density polyethylene is SKMDPE YUCLAIR RG300U DX800 from South Korea;

[0009] Furthermore, the antioxidant is antioxidant 1330; the 1-coupling agent is aminopropyl triethoxysilane KH-550; the 2-coupling agent is γ-glycidyloxypropyl trimethoxysilane KH-560; the microcrystalline cellulose is MCC model KG1000 of Asahi Kasei Corporation of Japan; the nano toughening agent is Nanostrength MAM poly [methyl methacrylate-co-polar comonomer] -B-poly (butyl acrylate) -B-[polymethyl methacrylate-co-polar monomer]; the compatibilizer is polyethylene grafted maleic anhydride W1L of Coase Chemical Co., Ltd.

[0010] Among them, the microcrystalline cellulose adopts KG1000 model MCC, whose particle major diameter / minor diameter ratio is increased to the maximum, promoting the plastic deformation of the entanglement between particles, thereby achieving high formability and strengthening the roto-molding material, which not only improves the material strength, but also takes into account the good roto-molding processability;

[0011] Nanostrength MAM, a nano toughening agent, is a new type of self-assembled cluster copolymer, which is poly[methyl methacrylate-co-polar comonomer]-B-poly(butyl acrylate)-B-[polymethyl methacrylate-co-polar monomer]. It has three regions connected by covalent bonds on the same line, and usually has a strong mutual repulsion. On the basis of maintaining its own stable performance, the block chain structure has a synergistic effect in the blend chain structure through the island effect and the spatial network interpenetrating structure, which greatly promotes the improvement of strength and toughness.

[0012] At the same time, the compatibilizer adopts polyethylene grafted maleic anhydride W1L, which is a linear low-density polyethylene molecular chain grafted with maleic anhydride molecules by chemical reaction, so that the polyethylene end has the re-reactivity and strong polarity of maleic anhydride polar molecules. Therefore, it can improve the interfacial affinity between polyolefin substrates and inorganic substances such as metal powder, glass fiber, wood powder, mineral powder, starch, etc., thereby achieving the effect of enhancing the strength of composite materials.

[0013] In the above-mentioned high-impact and high-strength PE water supply pipe, the granulation of the modification aid is prepared by the following steps:

[0014] (1) heating 18-20 parts of polyphthalamide to 120-130° C., adding 1-2 parts of aluminum nitride, 0.5-0.8 parts of microcrystalline cellulose, 0.1-0.2 parts of nano toughening agent, and 0.1-0.2 parts of compatibilizer, stirring at the temperature for 10-15 minutes, and cooling to room temperature to obtain a premix;

[0015] (2) 40-45 parts of medium density polyethylene, 0.1-0.2 parts of calcium peroxide, and 1-2 parts by weight of a 2-coupling agent are mixed, stirred at a constant temperature of 50-60° C. for 20-30 minutes, cooled to room temperature, mixed with the premix obtained in step (1), stirred and dispersed at 400-500 rpm for 3-5 minutes, and the remaining raw materials are added. After stirring evenly, the mixture is dried and granulated to a particle size of 2-4 mm to obtain a modification aid.

[0016] A method for preparing a high-impact and high-strength PE water supply pipe comprises the following steps:

[0017] (1) 2-4 parts of carbon black and 2-3 parts of polyamide wax powder are mixed, stirred evenly, and then 0.8-1 part of trinonylphenyl phosphite is added, stirred and reacted at 80-90° C. for 10-15 minutes, and cooled to room temperature to obtain a first mixture;

[0018] (2) adding 0.1-0.2 parts of 1-coupling agent to the first mixture, stirring and dispersing at 400-600 rpm for 4-6 minutes, and mixing the discharged material with the remaining raw materials to obtain a second mixture;

[0019] (3) The second mixture is fed into a kneader and kneaded at 80-90° C. The discharged material is cooled to room temperature and then fed into a parallel co-rotating twin-screw extruder for extrusion and formed in a mold to obtain a high-impact and high-strength PE water supply pipe.

[0020] The outstanding advantages of the present invention compared with the prior art are:

[0021] 1. The water supply pipe of the present invention has good surface finish, strong scratch resistance and impact resistance, and effectively reduces the friction coefficient between the PE water supply pipe and the ground during the dragging process. The product of the present invention has strong toughness, corrosion resistance, oxidation resistance and impact resistance.

[0022] 2. When the present invention is used for low-smoke halogen-free flame-retardant cable materials, it can improve the compatibility and adhesion between the polyolefin matrix and the inorganic flame retardant interface, improve the dispersibility and compatibility of magnesium hydroxide and aluminum hydroxide, thereby maximizing the flame retardancy of the cable materials, reducing the smoke index, smoke volume, calorific value and carbon monoxide generation, increasing the oxygen index, improving the dripping performance, etc., and improving the mechanical properties of the materials. Description of the drawings:

[0023] Figure 1 It is a reaction schematic diagram of the modification auxiliary agent of the present invention. Specific implementation method:

[0024] The present invention is further described below with reference to specific embodiments. Figure 1 :

[0025] Example 1

[0026] Formula of PE water pipe:

[0027]

[0028]

[0029] Production process:

[0030] Granulation of the modified additive: heat 18 kg of polyphthalamide to 120°C, add 1 kg of aluminum nitride, 0.5 kg of microcrystalline cellulose KG1000-MCC, 0.1 kg of nano toughening agent Nanostrength MAM, and 0.1 kg of polyethylene grafted maleic anhydride W1L, keep warm and stir for 10 minutes, cool to room temperature, and obtain a premix; mix 40 kg of medium-density polyethylene DX800 with 0.1 kg of calcium peroxide and 1 kg of γ-glycidyloxypropyltrimethoxysilane KH-560, stir at a constant temperature of 50°C for 20 minutes, cool to room temperature, mix with the above premix, stir and disperse at 400-500 rpm for 3 minutes, add the remaining 1 kg of bentonite grease, stir evenly, dry, and granulate to obtain a modified additive with a particle size of 2-4 mm.

[0031] Preparation method of PE water supply pipe: 2 kg of carbon black and 2 kg of polyamide wax powder are mixed, and after stirring evenly, 0.8 kg of trinonylphenyl phosphite is added, and the mixture is stirred and reacted at 80°C for 10 minutes, cooled to room temperature, 0.1 kg of aminopropyl triethoxysilane is added, and the mixture is stirred and dispersed at 400-600 rpm for 4 minutes. After the mixture is discharged, 0.1 kg of antioxidant 1330, 1 kg of calcium fluoride, 1 kg of epoxy stearate, 3 kg of the above-mentioned modification aid, and 100 kg of polyethylene YGH041 are added, and the mixture is sent to a kneader and kneaded at 80-90°C. The discharged material is cooled to room temperature, and then added to a parallel co-rotating twin-screw extruder for extrusion, and formed in a mold to obtain a high-impact and high-strength PE water supply pipe.

[0032] Example 2

[0033] Formula of PE water pipe:

[0034] Polyethylene YGH041 102kg Modification additives Carbon Black 3kg Medium density polyethylene DX800 43kg Antioxidant 1330 0.2kg Polyphthalamide 19kg Polyamide wax powder 2.5kg Aluminum Nitride 1.5kg 1- Coupling agent KH-550 0.2kg Bentonite Grease 1.5kg Trinonylphenyl phosphite 0.9kg Calcium Peroxide 0.2kg Calcium Fluoride 1.5kg 2-Coupling agent KH-560 1.3kg Epoxy stearate 1.3kg KG1000-MCC 0.7kg Modification additives 5kg Nanostrength MAM 0.2kg Compatibilizer W1L 0.2kg

[0035] Production process:

[0036] Granulation of the modified additive: 19 kg of polyphthalamide was heated to 125°C, 1.5 kg of aluminum nitride, 0.7 kg of microcrystalline cellulose KG1000-MCC, 0.2 kg of nano toughening agent Nanostrength MAM, and 0.2 kg of polyethylene grafted maleic anhydride W1L were added, the mixture was stirred for 13 minutes, and the mixture was cooled to room temperature to obtain a premix; 43 kg of medium-density polyethylene DX800 was mixed with 0.2 kg of calcium peroxide and 1.3 kg of γ-glycidyloxypropyltrimethoxysilane KH-560, the mixture was stirred at a constant temperature of 55°C for 24 minutes, the mixture was cooled to room temperature and then mixed with the above premix, and the mixture was stirred and dispersed at 400-500 rpm for 4 minutes, and the remaining 1.5 kg of bentonite grease was added, the mixture was stirred evenly, and then dried and granulated to obtain a modified additive with a particle size of 2-4 mm;

[0037] Preparation method of PE water supply pipe: 3 kg of carbon black and 2.5 kg of polyamide wax powder are mixed, and after stirring evenly, 0.9 kg of trinonylphenyl phosphite is added, and the mixture is stirred and reacted at 85°C for 13 minutes, cooled to room temperature, 0.2 kg of aminopropyl triethoxysilane is added, and the mixture is stirred and dispersed at 400-600 rpm for 5 minutes. After the mixture is discharged, 0.2 kg of antioxidant 1330, 1.5 kg of calcium fluoride, 1.3 kg of epoxy stearate, 5 kg of the above-mentioned modification aid, and 102 kg of polyethylene YGH041 are added, and the mixture is sent to a kneader and kneaded at 85°C. The discharged material is cooled to room temperature, and then added to a parallel co-rotating twin-screw extruder for extrusion, and formed in a mold to obtain a high-impact and high-strength PE water supply pipe.

[0038] Example 3

[0039] Formula of PE water pipe:

[0040] Polyethylene YGH041 104kg Modification additives Carbon Black 4kg Medium density polyethylene DX800 45kg Antioxidant 1330 0.2kg Polyphthalamide 20kg Polyamide wax powder 3kg Aluminum Nitride 2kg 1- Coupling agent KH-550 0.2kg Bentonite Grease 2kg Trinonylphenyl phosphite 1kg Calcium Peroxide 0.2kg Calcium Fluoride 2kg 2-Coupling agent KH-560 1.5kg Epoxy stearate 1.5kg KG1000-MCC 0.8kg Modification additives 6kg Nanostrength MAM 0.2kg Compatibilizer W1L 0.2kg

[0041] Production process:

[0042] Granulation of the modified additive: heat 20 kg of polyphthalamide to 130°C, add 2 kg of aluminum nitride, 0.8 kg of microcrystalline cellulose KG1000-MCC, 0.2 kg of nano toughening agent Nanostrength MAM, and 0.2 kg of polyethylene grafted maleic anhydride W1L, keep warm and stir for 15 minutes, cool to room temperature, and obtain a premix; mix 45 kg of medium-density polyethylene DX800 with 0.2 kg of calcium peroxide and 1.5 kg of γ-glycidyloxypropyltrimethoxysilane KH-560, keep constant temperature stirring at 60°C for 30 minutes, cool to room temperature, mix with the above premix, stir and disperse at 400-500 rpm for 6 minutes, add the remaining 1.5 kg of bentonite grease, stir evenly, dry, and granulate to obtain a modified additive with a particle size of 2-4 mm;

[0043] Preparation method of PE water supply pipe: 4 kg of carbon black and 3 kg of polyamide wax powder are mixed, and 1 kg of trinonylphenyl phosphite is added after stirring evenly. The mixture is stirred and reacted at 90°C for 15 minutes, cooled to room temperature, and 0.2 kg of aminopropyl triethoxysilane is added. The mixture is stirred and dispersed at 400-600 rpm for 6 minutes. After the mixture is discharged, 0.2 kg of antioxidant 1330, 2 kg of calcium fluoride, 1.5 kg of epoxy stearate, 6 kg of the above-mentioned modification aid, and 104 kg of polyethylene YGH041 are added. The mixture is sent into a kneader and kneaded at 90°C. The discharged material is cooled to room temperature, and then added into a parallel co-rotating twin-screw extruder for extrusion. The mixture is formed in a mold to obtain a high-impact and high-strength PE water supply pipe.

[0044] Comparative Example 1 (Compared with Example 1, no modifying agent was added) formula:

[0045] Polyethylene YGH041 100kg Carbon Black 2kg Antioxidant 1330 0.1kg Polyamide wax powder 2kg 1- Coupling agent KH-550 0.1kg Trinonylphenyl phosphite 0.8kg Calcium Fluoride 1kg Epoxy stearate 1kg Modification additives 0kg

[0046] Production process:

[0047] Mix 2 kg of carbon black and 2 kg of polyamide wax powder, stir evenly, then add 0.8 kg of trinonylphenyl phosphite, stir and react at 80°C for 10 minutes, cool to room temperature, add 0.1 kg of aminopropyl triethoxysilane, stir and disperse at 400-600 rpm for 4 minutes, after discharging, add 0.1 kg of antioxidant 1330, 1 kg of calcium fluoride, 1 kg of epoxy stearate, 100 kg of polyethylene YGH041, send to a kneader, knead at 80-90°C, cool the discharging material to room temperature, add to a parallel co-rotating twin-screw extruder for extrusion, and shape it in a mold to obtain a high-impact and high-strength PE water pipe.

[0048] Experiment: Take the polyethylene water supply pipes obtained in Examples 1-3 and Comparative Example 1, prepare samples, test their performances respectively and record the test results:

[0049] Tensile properties: GB / T 1040-2018 was used as the reference standard. The tensile properties of the samples were tested using an electronic tensile testing machine. The sample size was 110mm×25mm×4.0mm, and the tensile rate was 50mm / min.

[0050] Bending performance: GB / T 9341-2008 was used as the reference standard. The bending performance of the sample was tested using a bending tester. The sample size was 80mm×10mm×4.0mm, the indenter radius was 5.0mm, the support radius was 5.0mm, and the test speed was 2mm / min.

[0051] Impact performance: GB / T 1043-2008 is used as the reference standard. The impact performance of the sample is tested using an impact testing machine. The sample size is 80mm×10mm×4.0mm, and the notch bottom radius is 1.0mm.

[0052] Hydrostatic strength test: According to GB / T 6111-2018, the hydrostatic strength of the sample to be tested is tested, temperature: 80°C, time: 165h, hoop stress: 5.4MPa;

[0053] Elongation at break: Tested in accordance with GB / T8804.1-2003 "Determination of tensile properties of thermoplastic pipes Part 1".

[0054]

[0055]

[0056] According to the data in the above table, we can clearly draw the following conclusions:

[0057] The polyethylene water supply pipes obtained in Examples 1-3 are compared with the polyethylene water supply pipes obtained in Comparative Example 1. The test results show that the polyethylene water supply pipes obtained in Examples 1-3 have higher tensile strength, impact strength and bending strength data than those of the comparative example, which fully demonstrates that the present invention achieves the improvement of the strength of the polyethylene water supply pipes by the modified additive.

[0058] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high impact resistance and high strength PE water supply pipe, characterized by: The invention comprises the following components in parts by weight: 100-104 parts of polyethylene resin, 2-4 parts of carbon black, 0.1-0.2 parts of antioxidant, 2-3 parts of polyamide wax micropowder, 0.1-0.2 parts of 1-coupling agent, 0.8-1 parts of trinonylphenyl phosphite, 1-1.5 parts of calcium fluoride, 1-1.5 parts of octyl epoxy stearate, and 3-6 parts of modification aid; The modification aid is composed of the following raw materials in parts by weight: 40-45 parts of medium-density polyethylene, 18-20 parts of polyphthalamide, 1-2 parts of aluminum nitride, 1-2 parts of bentonite grease, 0.1-0.2 parts of calcium peroxide, 1-2 parts of 2-coupling agent, 0.5-0.8 parts of microcrystalline cellulose, 0.1-0.2 parts of nano toughening agent, and 0.1-0.2 parts of compatibilizer.

2. A high impact resistance and high strength PE water supply pipe according to claim 1, characterized in that: The granulation of the modified auxiliary agent is prepared by the following steps: (1) heating 18-20 parts of polyphthalamide to 120-130° C., adding 1-2 parts of aluminum nitride, 0.5-0.8 parts of microcrystalline cellulose, 0.1-0.2 parts of nano toughening agent, and 0.1-0.2 parts of compatibilizer, stirring at the temperature for 10-15 minutes, and cooling to room temperature to obtain a premix; (2) 40-45 parts of medium density polyethylene, 0.1-0.2 parts of calcium peroxide, and 1-2 parts by weight of a 2-coupling agent are mixed, stirred at a constant temperature of 50-60° C. for 20-30 minutes, cooled to room temperature, mixed with the premix obtained in step (1), stirred and dispersed at 400-500 rpm for 3-5 minutes, and the remaining raw materials are added. After stirring evenly, the mixture is dried and granulated to a particle size of 2-4 mm to obtain a modification aid.

3. A method for preparing a high-impact and high-strength PE water supply pipe according to any one of claims 1 to 2, characterized in that: The following steps are included: (1) 2-4 parts of carbon black and 2-3 parts of polyamide wax powder are mixed, stirred evenly, and then 0.8-1 part of trinonylphenyl phosphite is added, stirred and reacted at 80-90° C. for 10-15 minutes, and cooled to room temperature to obtain a first mixture; (2) adding 0.1-0.2 parts of 1-coupling agent to the first mixture, stirring and dispersing at 400-600 rpm for 4-6 minutes, and mixing the discharged material with the remaining raw materials to obtain a second mixture; (3) The second mixture is fed into a kneader and kneaded at 80-90° C. The discharged material is cooled to room temperature and then fed into a parallel co-rotating twin-screw extruder for extrusion and formed in a mold to obtain a high-impact and high-strength PE water supply pipe.

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