Modified polyethylene groove type building drainage pipe and preparation method thereof

Abstract

The invention discloses a modified polyethylene groove type building drainage pipe and a preparation method thereof, and relates to the technical field of plastic pipes. The modified polyethylene groove type building drainage pipe at least comprises the following raw materials in parts by weight: 20-30 parts of silane modified polyethylene; 30-50 parts by weight of high density polyethylene; 5-10 parts by weight of talcum powder; 5 to 15 parts by weight of modified basalt fiber bundles wrapped by polydopamine; 1-5 parts by weight of a lubricant; 3-6 parts by weight of a crosslinking accelerator; and 1-2 parts by weight of an antioxidant. The talcum powder and the modified basalt fiber bundles are added into the silane modified polyethylene and high-density polyethylene cross-linked resin, and the obtained groove type building drainage pipe has the advantages of being high in strength, high in toughness, excellent in temperature resistance and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipes, and in particular to a modified polyethylene grooved building drainage pipe and a preparation method thereof. Background Art

[0002] Polyethylene (PE) is one of the five general-purpose plastics and is widely used in different industries. Among them, high-density polyethylene (HDPE) accounts for about half of the products in various industries. HDPE is polymerized by German chemist Karl Ziegler using zirconium-titanium complex catalyst to form polyethylene with high density and linear structure under low temperature and low pressure conditions. Therefore, high-density polyethylene is also called low-pressure polyethylene. Compared with low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), HDPE has high rigidity, hardness and mechanical strength, good low-temperature impact resistance, good stress cracking resistance, good wear resistance and aging resistance. Compared with pipes made of other materials, it also has low notch sensitivity, high shear strength and excellent scratch resistance. Its environmental stress cracking resistance is also very outstanding. It is particularly suitable for use in high-pressure and harsh transportation environments, such as water supply and slurry transportation.

[0003] Pipeline transportation is an infrastructure to ensure the normal production and life of society and promote economic prosperity. Due to some inherent characteristics of traditional drainage pipes, it is difficult to adapt to the needs of rapid urban development. Therefore, some new plastic pipes have emerged, such as high-density polyethylene (HDPE) spiral pipes, HDPE double-wall corrugated pipes, etc., which are superior to traditional cast iron pipes, steel pipes, and cement pipes in terms of performance and ease of construction. Therefore, plastic pipes are gradually replacing traditional pipes and have developed rapidly. However, due to the characteristics of PE materials themselves, PE pipes also have certain weaknesses, such as low strength, no flame retardancy, and poor low-temperature resistance. As a result, the use of low-pressure polyethylene materials in low-pressure pipeline transportation may cause problems such as pipeline rupture, liquid leakage and damage under severe weather conditions and other external factors. Therefore, high-performance HDPE pipe materials must be developed to ensure the safety and effectiveness of pipeline transportation. Summary of the invention

[0004] The purpose of the present invention is to provide a modified polyethylene grooved building drainage pipe and a preparation method thereof, so as to solve the following technical problems: The existing polyethylene grooved building drainage pipes have the problems of low notch strength, poor low temperature resistance and short service life.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A modified polyethylene grooved building drainage pipe comprises at least the following raw materials in parts by weight: Silane modified polyethylene 20-30; High density polyethylene 30-50; Talc 5-10; Polydopamine-coated modified basalt fiber bundles 5-15; Lubricant 1-5; Crosslinking accelerator 3-6; Antioxidants 1-2.

[0006] As a further embodiment of the present invention: the preparation method of the silane-modified polyethylene comprises at least the following steps: Mix medium-density polyethylene, aminosilane coupling agent and dicumyl peroxide, extrude and granulate in an extruder, and the extrusion granulation temperature is 120-220° C. The finished product after granulation is dried and the moisture content is controlled below 200 ppm to obtain silane-modified polyethylene.

[0007] As a further embodiment of the present invention: the density range of the medium density polyethylene is 0.930-0.939 g / cm 3 .

[0008] As a further embodiment of the present invention: the weight ratio of the medium density polyethylene, the aminosilane coupling agent and the dicumyl peroxide is 20-30:1-2:0.1-0.5.

[0009] As a further solution of the present invention: the preparation method of the modified basalt fiber bundle wrapped with polydopamine comprises the following steps: The basalt fiber bundle is placed in an acetone solution and heated to 80-100° C., condensed and refluxed for 12-24 hours, then cleaned with deionized water, and vacuum dried to obtain a surface-treated basalt fiber bundle; The surface-treated basalt fiber bundle is uniformly dispersed in a mixed solution of an aminosilane coupling agent, ethanol and deionized water, reacted at 50-70° C. for 2-4 h, then cleaned with deionized water and dried to obtain a modified basalt fiber bundle; The modified basalt fiber bundle is added to the dopamine hydrochloride aqueous solution, and after being stirred evenly, the pH is adjusted to 8-9, and then air is slowly introduced into the solution, and the solution is stirred for reaction for 4-8 hours to obtain the modified basalt fiber bundle wrapped with polydopamine.

[0010] As a further embodiment of the present invention: the aminosilane coupling agent is 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldiethoxysilane or 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane.

[0011] As a further embodiment of the present invention: the weight ratio of the aminosilane coupling agent, the ethanol and the deionized water is 1:4:(0.1-0.5), and the concentration of the dopamine hydrochloride is 1-3 g / L.

[0012] As a further embodiment of the present invention: the density range of the high-density polyethylene is 0.941-0.960 g / cm 3 .

[0013] As a further embodiment of the present invention: the lubricant is at least one of polyethylene wax or calcium stearate, the cross-linking accelerator is p-tert-butylbenzoic acid, and the antioxidant is at least one of antioxidant 1010, antioxidant 168 or antioxidant 330.

[0014] A method for preparing the modified polyethylene grooved building drainage pipe as described in any one of the above items comprises at least the following steps: The silane-modified polyethylene, modified basalt fiber bundle, talcum powder, lubricant and antioxidant are fully mixed in a high-speed mixer, the speed of the high-speed mixer is controlled at 100-200 rpm, and then put into an extruder for granulation, the extruder granulation temperature is 100°C-200°C, and after granulation, drying is performed, and the moisture content is controlled below 200ppm to obtain a cross-linked mixture; The cross-linked mixture, high-density polyethylene and cross-linking accelerator are stirred in a high-speed mixer at a rotation speed of 300-600 rpm for 3-10 minutes, and then put into an extruder to form a pipe product. After extrusion, the pipe product is immersed in a water bath or steam room above 85° C. for more than 8 hours to obtain a modified polyethylene grooved building drainage pipe.

[0015] Beneficial effects of the present invention: The grooved building drainage pipe prepared in the present application is prepared by cross-linking silane-modified polyethylene and high-density polyethylene. The silane-modified polyethylene is a silane-modified medium-density polyethylene. The high-density polyethylene has excellent low-temperature performance, high mechanical strength and high crystallization performance. The medium-density polyethylene has good low-temperature performance and flexibility. The high-density polyethylene and the medium-density polyethylene are cross-linked. While improving the strength of the polyethylene matrix, the low-temperature resistance and processing performance of the obtained drainage pipe are also improved, so that the drainage pipe obtained in the present application can be used in relatively extreme low-temperature and high-temperature environments. In addition, the present application also adds modified basalt fiber bundles and talcum powder to the polyethylene cross-linking system for performance optimization. The obtained grooved building drainage pipe has the characteristics of high strength, good mechanical properties, good temperature resistance, excellent corrosion resistance and long service life. The drainage pipe preparation method of the present application is simple, suitable for industrial production, and the pipe processing stability is good.

[0016] The present application adds modified basalt fiber bundles to the polyethylene substrate. After the basalt fiber bundles are treated with an aminosilane coupling agent, the silane chains are grafted to the basalt fiber bundles, and amino functional groups are introduced to the basalt fiber bundles. Then, polydopamine is coated on the surface of the basalt fiber bundles grafted with silane chains. The polydopamine and the amino functional groups can achieve covalent bond fixation. At the same time, the polyethylene matrix is ​​a cross-linked matrix of aminosilane-modified polyethylene and high-density polyethylene. Polydopamine can improve the interaction between the basalt fiber bundles and the polyethylene matrix, so that the basalt fiber bundles can be evenly embedded in the polyethylene resin collective. The modified basalt fiber bundles in the present application are stably embedded in the resin, which can significantly improve the strength of the drain pipe, making it difficult to break and crack, and can improve the corrosion resistance of the drain pipe, extending the service life of the drain pipe.

[0017] Talcum powder is also added in this application, and the lubricant promotes the uniform dispersion of talcum powder in the cross-linking system of silane-modified polyethylene and high-density polyethylene, so that talcum powder can give full play to its performance. When the polyethylene composite material is impacted by external force, relative slip will occur preferentially between talcum powder particles, acting as a stress concentration center to produce silver streaks to dissipate energy, while preventing the silver streaks from expanding, thereby toughening the polyethylene composite material to improve the notch impact strength; in addition, the filling effect of talcum powder hinders the molecular movement of the polyethylene composite material to make it rigid, thereby improving the tensile strength and bending performance of the polyethylene composite material, and reducing the elongation at break. Talcum powder itself has extremely high heat resistance, and the talcum powder evenly dispersed in the matrix can form a heat-resistant network structure, improve the heat resistance of the drain pipe, and at the same time, the uniform distribution of talcum powder also reduces the friction coefficient of the drain pipe wall, thereby reducing the scaling phenomenon that occurs during the use of the drain pipe, thereby improving the drainage and sewage efficiency. DETAILED DESCRIPTION

[0018] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1 The preparation method of the modified basalt fiber bundle wrapped with polydopamine comprises the following steps: The basalt fiber bundle was placed in an acetone solution at 100°C for condensation and reflux for 12 h, then cleaned with deionized water, and dried in a vacuum drying oven at 40°C for 5 h to obtain a surface-treated basalt fiber bundle. The basalt fiber bundle after the surface treatment is placed in a mixed solution of 3-aminopropyltrimethoxysilane, anhydrous ethanol and deionized water in a mass ratio of 1:4:0.1, and after being uniformly dispersed by ultrasound, it is reacted at 50°C for 4 hours, and then cleaned with deionized water and dried in a drying oven at 40°C for 5 hours to obtain a modified basalt fiber bundle; The modified basalt fiber bundle was added into a 2.0 g / L dopamine hydrochloride aqueous solution, stirred at 200 rpm for 10 min, and then NaOH was added to adjust the pH to 8.5. Then, air was slowly introduced into the mixed solution, and the mixture was stirred for 6 h. After the reaction, the mixture was filtered, washed, and dried to obtain a modified basalt fiber bundle wrapped with polydopamine.

[0020] The preparation method of silane-modified polyethylene comprises the following steps: 25 parts by weight of medium-density polyethylene, 2 parts by weight of aminosilane coupling agent and 0.2 parts by weight of diisopropylbenzene peroxide are placed in a high-speed mixer, stirred at a speed of 400 rpm for 3 minutes, and then melt-extruded by a twin-screw extruder. The granulation process is at a temperature of 180° C. and a twin-screw speed of 400 rpm. After granulation, it is dried at 80° C. for 4 hours, and the moisture content is controlled below 200 ppm to obtain silane-modified polyethylene.

[0021] The preparation method of the modified polyethylene grooved building drainage pipe comprises the following steps: 25 parts by weight of silane-modified polyethylene, 10 parts by weight of modified basalt fiber bundles, 5 parts by weight of talc, 3 parts by weight of lubricant and 1 part by weight of antioxidant are fully mixed in a high-speed mixer, the speed of the high-speed mixer is controlled at 200 rpm for stirring for 4 minutes, and then put into an extruder for granulation, the extruder granulation temperature is 180° C. After granulation, drying treatment is performed, and the moisture content is controlled below 200 ppm to obtain a cross-linked mixture; The cross-linked mixture, 50 parts high-density polyethylene and 4 parts by weight of a cross-linking accelerator are stirred in a high-speed mixer at a speed of 400 rpm for 8 minutes, and then put into an extruder to form a pipe product. After extrusion, the pipe product is immersed in a 90° C. water bath or steam room for 10 hours to obtain a modified polyethylene grooved building drainage pipe.

[0022] Example 2 The preparation method of the modified basalt fiber bundle wrapped with polydopamine comprises the following steps: The basalt fiber bundle was placed in an acetone solution at 100°C for condensation and reflux for 12 h, then cleaned with deionized water, and dried in a vacuum drying oven at 40°C for 5 h to obtain a surface-treated basalt fiber bundle. The basalt fiber bundle after the surface treatment is placed in a mixed solution of 3-aminopropyltriethoxysilane, anhydrous ethanol and deionized water in a mass ratio of 1:4:0.1, and after being uniformly dispersed by ultrasound, it is reacted at 50°C for 4 hours, and then cleaned with deionized water and dried in a drying oven at 40°C for 5 hours to obtain a modified basalt fiber bundle; The modified basalt fiber bundle was added into a 2.0 g / L dopamine hydrochloride aqueous solution, stirred at 200 rpm for 10 min, and then NaOH was added to adjust the pH to 8.5. Then, air was slowly introduced into the mixed solution, and the mixture was stirred for 6 h. After the reaction, the mixture was filtered, washed, and dried to obtain a modified basalt fiber bundle wrapped with polydopamine.

[0023] The components and preparation steps of the silane-modified polyethylene are the same as those in Example 1.

[0024] In the preparation steps of the modified polyethylene grooved building drainage pipe, only the modified basalt fiber bundles wrapped with polydopamine are replaced with the modified basalt fiber bundles wrapped with polydopamine prepared in this embodiment in equal amounts, and the other components and preparation steps are the same as those in Example 1.

[0025] Example 3 The preparation method of silane-modified polyethylene comprises the following steps: 25 parts by weight of medium density polyethylene, 1 part by weight of aminosilane coupling agent and 0.1 part by weight of diisopropylbenzene peroxide are placed in a high-speed mixer, stirred at a speed of 400 rpm for 3 minutes, and then melt-extruded by a twin-screw extruder. The granulation process is at a temperature of 180°C and a twin-screw speed of 400 rpm. After granulation, it is dried at 80°C for 4 hours, and the moisture content is controlled below 200 ppm to obtain silane-modified polyethylene.

[0026] The components and preparation steps of the polydopamine-wrapped modified basalt fiber bundle are the same as those in Example 1.

[0027] In the preparation steps of the modified polyethylene grooved building drainage pipe, only the silane-modified polyethylene prepared in this embodiment is replaced with an equal amount of the silane-modified polyethylene, and the other components and preparation steps are the same as those in Example 1.

[0028] Example 4 The preparation method of the modified polyethylene grooved building drainage pipe comprises the following steps: 30 parts by weight of silane-modified polyethylene, 5 parts by weight of modified basalt fiber bundles, 10 parts by weight of talc, 1 part by weight of lubricant and 1 part by weight of antioxidant are fully mixed in a high-speed mixer, the speed of the high-speed mixer is controlled at 200 rpm for stirring for 4 minutes, and then put into an extruder for granulation, the extruder granulation temperature is 180° C. After granulation, drying treatment is performed, and the moisture content is controlled below 200 ppm to obtain a cross-linked mixture; The cross-linked mixture, 50 parts high-density polyethylene and 3 parts by weight of a cross-linking accelerator are stirred in a high-speed mixer at a speed of 400 rpm for 8 minutes, and then put into an extruder to form a pipe product. After extrusion, the pipe product is immersed in a 90° C. water bath or steam room for 10 hours to obtain a modified polyethylene grooved building drainage pipe.

[0029] The components and preparation steps of the silane-modified polyethylene are the same as those in Example 1.

[0030] The components and preparation steps of the polydopamine-wrapped modified basalt fiber bundle are the same as those in Example 1.

[0031] Comparative Example 1 The preparation step of silane-modified polyethylene was omitted.

[0032] The components and preparation steps of the polydopamine-wrapped modified basalt fiber bundle are the same as those in Example 1.

[0033] In the preparation steps of the modified polyethylene grooved building drainage pipe, the silane-modified polyethylene is replaced with an equal amount of the high-density polyethylene in Example 1, and the other components and preparation steps are the same as those in Example 1.

[0034] Comparative Example 2 The components and preparation steps of the silane-modified polyethylene are the same as those of Example 1.

[0035] The preparation step of the polydopamine-wrapped modified basalt fiber bundle was omitted.

[0036] In the preparation steps of the modified polyethylene grooved building drainage pipe, the modified basalt fiber bundles wrapped with polydopamine are replaced with an equal amount of talcum powder in Example 1, and the other components and preparation steps are the same as those in Example 1.

[0037] Comparative Example 3 The components and preparation steps of the silane-modified polyethylene are the same as those of Example 1.

[0038] The step of preparing the polydopamine-wrapped modified basalt fiber bundle is omitted, and only the modified basalt fiber bundle is prepared.

[0039] In the preparation steps of the modified polyethylene grooved building drainage pipe, the modified basalt fiber bundle wrapped with polydopamine is replaced with an equal amount of modified basalt fiber bundle prepared according to the components and steps in Example 1, and the other components and preparation steps are the same as those in Example 1.

[0040] Comparative Example 4 The components and preparation steps of the silane-modified polyethylene are the same as those of Example 1.

[0041] The components and preparation steps of the polydopamine-wrapped modified basalt fiber bundle are the same as those in Example 1.

[0042] In the preparation steps of the modified polyethylene grooved building drainage pipe, only the talcum powder is replaced with an equal amount of the modified basalt fiber bundle wrapped with polydopamine prepared in this embodiment, and the other components and preparation steps are the same as those in Example 1.

[0043] Performance Testing Heat deformation temperature: refer to GB / T 1634.1-2019 test, the sample size is 80mm×10mm×4mm, the heating rate is (120±10)℃ / h; the test results are shown in the table below; Low temperature embrittlement temperature: refer to GB / T 5470-2008 test, the sample size is 80mm×10mm×4mm, the cooling rate is (-20±10)℃ / h; the test results are shown in the table below; Bending strength test: Refer to GB / T 9341-2008 to test the bending performance, the sample size is 80mm×10mm×4mm, and the test speed is 50mm / min; the test results are shown in the table below; Notched impact strength test: The notched impact strength of the specimen was tested in accordance with GB / T 1043.1-2008, with an impact capacity of 7.5J and a hammer lifting angle of 150°. The test results are shown in the table below. Acid and alkali resistance: According to GB / T 11547-2008 test, prepare samples with a length of 60mm±1mm, immerse at 70±2℃, immerse for 48h, and use 40% by mass nitric acid solution and 40% by mass sodium hydroxide solution as immersion liquid to test bending strength; the test results are shown in the table below;

[0044] It can be seen from the above table that the modified polyethylene grooved building drainage pipe obtained by the preparation method of Examples 1-4 of the present application has good temperature resistance, bending strength, notched impact strength and acid and alkali resistance. In Comparative Example 1, no silane-modified medium-density polyethylene is added, and the measured bending strength decreases significantly. In Comparative Example 2, no modified basalt fiber bundle wrapped with polydopamine is added, and its measured acid and alkali resistance decreases significantly. The modified basalt fiber bundle added in Comparative Example 3 is not wrapped with polydopamine, and its measured acid and alkali resistance also decreases. In Comparative Example 4, no talcum powder is added, and its measured heat resistance and notched impact strength decrease significantly. This shows that the drainage pipe prepared by cross-linking silane-modified medium-density polyethylene and high-density polyethylene in the present application will not reduce the low-temperature resistance of the drainage pipe, but also improve the bending performance of the drainage pipe, and the added polydopamine-wrapped modified basalt fiber bundle and talcum powder can be evenly distributed in the cross-linked network, thereby improving the heat resistance, notched impact resistance and corrosion resistance of the drainage pipe.

[0045] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A modified polyethylene grooved building drainage pipe, characterized in that: At least the following raw materials are included in parts by weight: Silane modified polyethylene 20-30; High density polyethylene 30-50; Talc 5-10; Polydopamine-coated modified basalt fiber bundles 5-15; Lubricant 1-5; Crosslinking accelerator 3-6; Antioxidants 1-2.

2. A modified polyethylene grooved building drainage pipe according to claim 1, characterized in that: The preparation method of the silane-modified polyethylene comprises at least the following steps: Mix medium-density polyethylene, aminosilane coupling agent and dicumyl peroxide, extrude and granulate in an extruder, and the extrusion granulation temperature is 120-220° C. The finished product after granulation is dried and the moisture content is controlled below 200 ppm to obtain silane-modified polyethylene.

3. A modified polyethylene grooved building drainage pipe according to claim 2, characterized in that: The density of the medium density polyethylene is in the range of 0.930-0.939 g / cm 3 .

4. A modified polyethylene grooved building drainage pipe according to claim 2, characterized in that: The weight ratio of the medium-density polyethylene, the aminosilane coupling agent and the dicumyl peroxide is 20-30:1-2:0.1-0.

5.

5. The modified polyethylene grooved building drainage pipe according to claim 1, characterized in that: The preparation method of the modified basalt fiber bundle wrapped with polydopamine comprises the following steps: The basalt fiber bundle is placed in an acetone solution and heated to 80-100° C., condensed and refluxed for 12-24 hours, then cleaned with deionized water, and vacuum dried to obtain a surface-treated basalt fiber bundle; The surface-treated basalt fiber bundle is uniformly dispersed in a mixed solution of an aminosilane coupling agent, ethanol and deionized water, reacted at 50-70° C. for 2-4 h, then cleaned with deionized water and dried to obtain a modified basalt fiber bundle; The modified basalt fiber bundle is added to the dopamine hydrochloride aqueous solution, and after being stirred evenly, the pH is adjusted to 8-9, and then air is slowly introduced into the solution, and the solution is stirred for reaction for 4-8 hours to obtain the modified basalt fiber bundle wrapped with polydopamine.

6. A modified polyethylene grooved building drainage pipe according to claim 5, characterized in that: The aminosilane coupling agent is 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldiethoxysilane or 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane.

7. The modified polyethylene grooved building drainage pipe according to claim 5, characterized in that: The weight ratio of the aminosilane coupling agent, the ethanol and the deionized water is 1:4:(0.1-0.5), and the concentration of the dopamine hydrochloride is 1-3 g / L.

8. The modified polyethylene grooved building drainage pipe according to claim 1, characterized in that: The density of the high-density polyethylene is in the range of 0.941-0.960 g / cm 3 .

9. The modified polyethylene grooved building drainage pipe according to claim 1, characterized in that: The lubricant is at least one of polyethylene wax and calcium stearate, the cross-linking accelerator is p-tert-butylbenzoic acid, and the antioxidant is at least one of antioxidant 1010, antioxidant 168 or antioxidant 330.

10. A method for preparing the modified polyethylene grooved building drainage pipe according to any one of claims 1 to 9, characterized in that: At least the following steps are included: The silane-modified polyethylene, modified basalt fiber bundle, talcum powder, lubricant and antioxidant are fully mixed in a high-speed mixer, the speed of the high-speed mixer is controlled at 100-200 rpm, and then put into an extruder for granulation, the extruder granulation temperature is 100°C-200°C, and after granulation, drying is performed, and the moisture content is controlled below 200ppm to obtain a cross-linked mixture; The cross-linked mixture, high-density polyethylene and cross-linking accelerator are stirred in a high-speed mixer at a rotation speed of 300-600 rpm for 3-10 minutes, and then put into an extruder to form a pipe product. After extrusion, the pipe product is immersed in a water bath or steam room above 85° C. for more than 8 hours to obtain a modified polyethylene grooved building drainage pipe.

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