Ultra-silence HDPE pipe for building drainage and preparation method of ultra-silence HDPE pipe

Abstract

The invention discloses an ultra-silence HDPE pipe for building drainage and a preparation method thereof.The HDPE pipe is formed by co-extruding and compounding an inner layer, a middle silence layer and an outer layer, and the inner layer and the outer layer are each prepared from HDPE, an antioxidant, a lubricating agent and pigment according to a certain proportion; the middle mute layer is prepared from HDPE (high-density polyethylene), modified mica powder, Expancel pre-expanded microspheres, maleic anhydride grafted polyethylene, an elastomer, a lubricant and an antioxidant according to a certain ratio. The preparation method of the HDPE pipe comprises the following steps: adding the inner-layer mixture into a first extruder for melt extrusion, adding the middle mute layer mixture into a second extruder for melt extrusion, adding the outer-layer mixture into a third extruder for melt extrusion, then carrying out co-extrusion molding through a co-extrusion mold, and then carrying out cooling shaping, thus obtaining the HDPE pipe. The ultra-silence HDPE pipe for building drainage is obtained. The HDPE pipe provided by the invention has good mute performance, high temperature resistance and toughness, and other performances meet the requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building drainage pipes, in particular to a super-silence HDPE pipe for building drainage and a preparation method thereof. BACKGROUND

[0002] During the sewage process, the water column falling at high speed continuously collides with the pipe wall, inducing radial vibration of the pipe wall and radiating air sound to the indoor space. At the same time, the vibration is transmitted axially along the pipe wall to the support and floor, causing structure sound pollution. The actual measurement shows that the A-weighted sound pressure level of the ordinary HDPE drainage pipe (SDR17, DN110) under the flow of 1 L / s can reach 54-60 dB, and the instantaneous peak value exceeds 65 dB, which is obviously higher than the limit value of ≤30 dB of the bedroom at night in GB 50118.

[0003] At present, the common noise reduction measures in the industry mainly include increasing the wall thickness of the pipe material, wrapping the sound insulation material or using cast iron pipe, etc. However, these methods generally have problems such as complex construction, system weight increase, cost increase and poor corrosion resistance, which are difficult to popularize and apply in large-scale civil buildings. SUMMARY

[0004] In order to solve the problems existing in the prior art, the present application provides a super-silence HDPE pipe for building drainage and a preparation method thereof. The HDPE pipe of the present application has good silencing performance, high temperature resistance and toughness, and other performances meet the requirements.

[0005] The technical scheme adopted to achieve the above-mentioned purpose of the present application is: A super-silence HDPE pipe for building drainage is composed of an inner layer, a middle silencing layer and an outer layer which are co-extruded and combined. The inner layer and the outer layer are both prepared from the following raw materials by mass fraction: HDPE 100 parts Antioxidant 0.1-0.4 parts Lubricant 0.2-0.6 parts Pigment 1-3 parts The middle silencing layer is prepared from the following raw materials by mass fraction: HDPE 100 parts Modified mica powder 10-14 parts Expancel pre-expanded microspheres 6-10 parts Maleic anhydride grafted polyethylene 2-4 parts Elastomer 2-4 parts Lubricant 0.4-0.8 parts Antioxidant 0.1-0.5 parts

[0006] Further, the preparation method of the modified mica powder is: 1. adding mica powder into 0.2-0.8 M hydrochloric acid solution, the solid-liquid ratio of mica powder to hydrochloric acid solution is 1 g:10-15 ml, then heating to 60-70°C, stirring at 60-70°C for 1-2 h, filtering, washing the filter cake until the pH of the filtrate is 6-7, to obtain pretreated mica powder; 2. dispersing the pretreated mica powder into water to prepare a slurry with a mass fraction of 2-8% of the pretreated mica powder, adding ammonia water to the slurry to adjust the pH to 6-7, then heating the slurry to 75-85°C, then adding cetyltrimethylammonium bromide to the slurry, stirring and reacting at 75-85°C for 0.5-1.5 h, then adding a 0.1-0.3% PVP aqueous solution, continuing to stir and react for 2-3 h, after the reaction is completed, filtering the obtained mixture, resuspending the filter cake in deionized water at 45-60°C, filtering after stirring for 5-10 min, repeating the resuspension and filtration steps 3-5 times, drying the obtained solid to obtain the modified mica powder.

[0007] Further, the elastomer is at least one selected from SEBS and POE.

[0008] Further, the lubricant is at least one selected from calcium stearate, ethylene bis-stearamide, glycerol monostearate and PE wax.

[0009] Further, the antioxidant is at least one selected from antioxidant 1010, antioxidant 168 and antioxidant 1076.

[0010] Further, the pigment is one of titanium dioxide, carbon black, red iron oxide and yellow iron oxide.

[0011] Further, the particle size of the Expancel pre-expanded microspheres is 30-60 µm.

[0012] A preparation method of a super-silent HDPE pipe for building drainage, characterized in that it comprises the following steps: S1. uniformly mixing HDPE, antioxidant, lubricant and pigment to obtain an inner layer or outer layer compound; S2. uniformly mixing HDPE, modified mica powder, maleic anhydride grafted polyethylene, elastomer, lubricant and antioxidant, then adding Expancel pre-expanded microspheres and continuing to mix uniformly to obtain a middle silent layer compound; S3, the inner layer compound is added into the first extruder for melt extrusion, the intermediate silent layer compound is added into the second extruder for melt extrusion, and the outer layer compound is added into the third extruder for melt extrusion, then co-extrusion molding is carried out through a co-extrusion die, and then cooling and shaping are carried out, so that the ultra-silent HDPE pipe for building drainage is obtained.

[0013] Further, the second extruder is a single-screw extruder, the temperature of the first zone of the barrel of the second extruder is 160-170°C, the temperature of the second zone is 170-180°C, the temperature of the third zone is 180-190°C, the temperature of the fourth zone is 190-200°C, and the temperature of the fifth zone is 195-205°C.

[0014] Compared with the prior art, the application has the following advantages and beneficial effects: 1. The Expancel pre-expanded microspheres and modified mica powder are added to the raw materials of the HDPE pipe to improve the silent performance of the HDPE pipe, the Expancel pre-expanded microspheres form a dispersed micro-pore / micro-bubble network in the HDPE, and through multiple scattering and viscoelastic dissipation, impact and medium-high frequency turbulent noise are absorbed, the modified mica is a sheet-shaped filler, which can improve the rigidity and interfacial friction of the pipe, resist crack propagation and increase overall damping, and also stabilize the micro-bubble structure, the Expancel pre-expanded microspheres and the modified mica powder synergistically cover the noise sources from high frequency to low frequency through micro-energy absorption + sheet damping, thereby significantly improving the silent effect of the HDPE pipe.

[0015] 2. The modified mica powder is added to reduce the amount of Expancel pre-expanded microspheres, thereby reducing the production cost of the HDPE pipe.

[0016] 3. The modified mica powder is added to improve the high-temperature resistance of the HDPE pipe, toughen the formula, and ensure that the rigidity and strength of the HDPE pipe meet the requirements of the national standard.

[0017] 4. The Expancel pre-expanded microspheres are added to reduce the weight of the HDPE pipe. DETAILED DESCRIPTION

[0018] The application will be described in detail below in combination with specific embodiments, but these embodiments are not interpreted as limiting the protection scope of the application in any sense.

[0019] The raw materials used in the following examples and comparative examples are as follows: The Expancel pre-expanded microspheres are purchased from Dongguan Jianmeng Chemical Co., Ltd., and the particle size range is 30-60 µm.

[0020] The preparation method of the modified mica powder is as follows: 1. Mica powder is added to 0.5M hydrochloric acid solution according to solid-liquid ratio of 1g:12mL, then heated to 65°C, stirred at 65°C for 1.5h, filtered, and the filter cake is washed until the pH of the filtrate is 6 to obtain pretreated mica powder; 2. The pretreated mica powder is dispersed into water to prepare a slurry with a mass fraction of 5% of the pretreated mica powder, ammonia water is added to the slurry to adjust the pH to 6-7, then the slurry is heated to 80°C, then cetyltrimethylammonium bromide is added to the slurry, stirred and reacted at 80°C for 1h, then a 0.2% mass fraction PVP aqueous solution is added, and the stirring and reaction is continued for 2.5h, after the reaction is completed, the obtained mixture is filtered, the filter cake is resuspended in 50°C deionized water, stirred for 8min, then filtered, the resuspension and filtration step is repeated 4 times, and the obtained solid is dried to obtain modified mica powder.

[0021] Example 1 An ultra-quiet HDPE pipe for building drainage is composed of an inner layer, a middle quiet layer and an outer layer by co-extrusion; The inner layer and the outer layer are both prepared from the following raw materials in parts by mass: HDPE 100 parts Antioxidant 1010 0.15 parts Antioxidant 168 0.1 part Glyceryl monostearate 0.25 parts PE wax 0.15 parts Titanium dioxide 2 parts The middle quiet layer is prepared from the following raw materials in parts by mass: HDPE 100 parts Modified mica powder 12 parts Expancel pre-expanded microspheres 8 parts Maleic anhydride grafted polyethylene 3 parts POE 3 parts Glyceryl monostearate 0.4 parts PE wax 0.2 parts Antioxidant 1010 0.2 parts Antioxidant 168 0.1 part

[0022] The preparation method of the above-mentioned ultra-quiet HDPE pipe for building drainage is as follows: 1. HDPE, antioxidant 1010, antioxidant 168, glyceryl monostearate, PE wax and titanium dioxide are uniformly mixed to obtain an inner layer or outer layer compound; 2, first HDPE, modified mica powder, maleic anhydride grafted polyethylene, POE, glycerol monostearate, PE wax, antioxidant 1010 and antioxidant 168 are mixed uniformly, then Expancel pre-expanded microspheres are added, and the intermediate mute layer compound is obtained by uniform mixing; 3, the inner layer compound is added to the first single screw extruder for melt extrusion; the intermediate mute layer compound is added to the second single screw extruder for melt extrusion, the temperature of the first zone of the second single screw extruder is 165°C, the temperature of the second zone is 175°C, the temperature of the third zone is 185°C, the temperature of the fourth zone is 195°C, and the temperature of the fifth zone is 200°C; the outer layer compound is added to the third single screw extruder for melt extrusion, then co-extrusion molding is carried out through a co-extrusion die, and then cooling and shaping are carried out, to obtain the super-mute HDPE pipe for building drainage.

[0023] Example 2 A super-mute HDPE pipe for building drainage is composed of an inner layer, an intermediate mute layer and an outer layer which are co-extruded and combined. The raw materials and the ratio of the inner layer and the outer layer are the same as those in example 1. The intermediate mute layer is prepared from the following raw materials by mass fraction: HDPE 100 parts Modified mica powder 14 parts Expancel pre-expanded microspheres 6 parts Maleic anhydride grafted polyethylene 4 parts POE 2 parts Glycerol monostearate 0.5 parts PE wax 0.3 parts Antioxidant 1010 0.07 parts Antioxidant 168 0.03 parts.

[0024] The preparation method of the super-mute HDPE pipe for building drainage in this example is the same as that in example 1.

[0025] Example 3 A super-mute HDPE pipe for building drainage is composed of an inner layer, an intermediate mute layer and an outer layer which are co-extruded and combined. The raw materials and the ratio of the inner layer and the outer layer are the same as those in example 1. The intermediate mute layer is prepared from the following raw materials by mass fraction: HDPE 100 parts Modified mica powder 10 parts Expancel pre-expanded microspheres 10 parts Maleic anhydride grafted polyethylene 2 parts POE 4 parts Glycerol monostearate 0.25 parts PE wax 0.15 parts Antioxidant 1010 0.3 parts Antioxidant 168 0.2 parts.

[0026] The preparation method of the super-silence HDPE pipe for building drainage in this example is the same as that in Example 1.

[0027] Comparative Example 1 An HDPE pipe for building drainage is formed by co-extrusion of an inner layer, a middle silencing layer and an outer layer; The raw materials and the proportioning of the inner layer and the outer layer are the same as those in Example 1; The middle silencing layer is prepared from the following raw materials in parts by mass: HDPE 100 parts Modified mica powder 20 parts Maleic anhydride grafted polyethylene 3 parts POE 3 parts Glycerol monostearate 0.4 parts PE wax 0.2 parts Antioxidant 1010 0.2 parts Antioxidant 168 0.1 parts.

[0028] The preparation method of the HDPE pipe for building drainage in this comparative example is the same as that in Example 1.

[0029] Comparative Example 2 An HDPE pipe for building drainage is formed by co-extrusion of an inner layer, a middle silencing layer and an outer layer; The raw materials and the proportioning of the inner layer and the outer layer are the same as those in Example 1; The middle silencing layer is prepared from the following raw materials in parts by mass: HDPE 100 parts Expancel pre-expanded microspheres 20 parts Maleic anhydride grafted polyethylene 3 parts POE 3 parts Glycerol monostearate 0.4 parts PE wax 0.2 parts Antioxidant 1010 0.2 parts Antioxidant 168 0.1 parts.

[0030] The preparation method of the HDPE pipe for building drainage in this comparative example is the same as that in Example 1.

[0031] Comparative Example 3 The application discloses a kind of HDPE pipes for building drainage, which is composed of inner layer, intermediate mute layer and outer layer by co-extrusion composite; The raw materials and the ratio of the inner layer and the outer layer are the same as those in Example 1. The intermediate mute layer is prepared from the following raw materials by mass fraction: HDPE 100 parts Maleic anhydride grafted polyethylene 3 parts POE 3 parts Glyceryl monostearate 0.4 parts PE wax 0.2 parts Antioxidant 1010 0.2 parts Antioxidant 168 0.1 parts.

[0032] The preparation method of the HDPE pipe for building drainage in the present comparative example is the same as that in Example 1.

[0033] The HDPE pipes for building drainage (SDR17, DN110) prepared in Examples 1-3 and Comparative Examples 1-3 are tested as follows: Water flow noise decibel value: tested according to standard CJ / T 312; Flat test: tested according to standard GB / T 9647; Drop hammer impact test: tested according to standard GB / T 14152; Oxidation induction time: tested according to standard GB / T 19466.6, and a weather resistance test is performed by using an ultraviolet accelerated aging test box. Test parameters: test time 1000 hours; radiation amount 1.2 W / m 2 ; illumination cycle UV irradiation time 50℃, 4h, condensation time 40℃, 4h. The test results are shown in the following table:

[0034] As shown in the above table, by comparing Example 1 with Comparative Examples 1-3, it can be found that by adding Expancel pre-expanded microspheres and modified mica powder in the raw materials of the intermediate layer of the HDPE pipe, the mute performance of the HDPE pipe can be significantly improved, and the weather resistance and toughness at low temperature can also be improved to a certain extent.

Claims

1. A type of ultra-quiet HDPE pipe for building drainage, characterized in that... It is composed of an inner layer, a middle sound-absorbing layer and an outer layer, which are co-extruded composites. Both the inner and outer layers are prepared from the following raw materials in parts by weight: 100 HDPE Antioxidant 0.1-0.4 parts Lubricant 0.2-0.6 parts 1-3 parts pigment; The intermediate sound-absorbing layer is prepared from the following raw materials in parts by weight: 100 HDPE 10-14 parts modified mica powder 6–10 parts of Expancel pre-expanded microspheres 2–4 parts of maleic anhydride-grafted polyethylene 2-4 parts of elastomer Lubricant 0.4–0.8 parts Antioxidant 0.1-0.5 parts.

2. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that... The method for preparing the modified mica powder is as follows: 2.1 Add mica powder to 0.2-0.8M hydrochloric acid solution, with a solid-liquid ratio of mica powder to hydrochloric acid solution of 1g:10-15mL, then heat to 60-70°C and stir at 60-70°C for 1-2 h. Filter and wash the filter cake until the pH of the filtrate is 6-7 to obtain pretreated mica powder. 2.

2. Disperse pretreated mica powder in water to prepare a slurry with a pretreated mica powder mass fraction of 2-8%. Add ammonia water to the slurry to adjust the pH to 6-7. Then heat the slurry to 75-85°C. Subsequently, add hexadecyltrimethylammonium bromide to the slurry and stir the reaction at 75-85°C for 0.5-1.5 h. Then add a PVP aqueous solution with a mass fraction of 0.1-0.3% and continue stirring the reaction for 2-3 h. After the reaction is completed, filter the resulting mixed product. Resuspend and wash the filter cake with deionized water at 45-60°C. Stir for 5-10 min and then filter. Repeat the resuspension and filtration steps 3-5 times. Dry the obtained solid to obtain modified mica powder.

3. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that: The elastomer is selected from at least one of SEBS and POE.

4. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that: The lubricant is selected from at least one of calcium stearate, ethylene bis-stearamide, glyceryl monostearate and PE wax.

5. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

6. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that: The pigment is one of titanium dioxide, carbon black, iron oxide red, and iron oxide yellow.

7. The ultra-quiet HDPE pipe for building drainage according to claim 1, characterized in that: The Expansion pre-expanded microspheres have a particle size of 30-60µm.

8. A method for preparing the ultra-quiet HDPE pipe for building drainage as described in claim 1, characterized in that... Includes the following steps: S1. Mix HDPE, antioxidant, lubricant and pigment evenly to obtain inner or outer layer compound; S2. First, mix HDPE, modified mica powder, maleic anhydride grafted polyethylene, elastomer, lubricant and antioxidant evenly, then add Expansion pre-expanded microspheres and continue to mix evenly to obtain the intermediate sound insulation layer mixture. S3. The inner layer compound is added to the first extruder for melt extrusion, the middle sound-absorbing layer compound is added to the second extruder for melt extrusion, and the outer layer compound is added to the third extruder for melt extrusion. Then, the mixture is co-extruded through a co-extrusion die and cooled and shaped to obtain the ultra-quiet HDPE pipe for building drainage.

9. The method for preparing ultra-quiet HDPE pipes for building drainage according to claim 8, characterized in that: The second extruder is a single-screw extruder. The temperature of the barrel of the second extruder is 160-170°C in zone one, 170-180°C in zone two, 180-190°C in zone three, 190-200°C in zone four, and 195-205°C in zone five.

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