A sound-insulating U-shaped drainage pipe and its preparation method

Abstract

The present invention discloses a sound-insulating U-PVC drainage pipe and a preparation method thereof. The drainage pipe is co-extruded and compounded by an outer layer, a core layer and an inner layer. Both the outer and inner layers are prepared from raw materials including PVC resin, filler, stabilizer, processing aid, impact-resistant aid, lubricant, titanium dioxide and antioxidant in certain proportions. The core layer is prepared from raw materials including PVC resin, expanded perlite, isopropyl dioleoyl titanate (dioctyl phosphatooxy titanate), processing aid, stabilizer and lubricant in certain proportions. The drainage pipe of the present invention has good sound-insulating performance and flame-retardant performance, and other performances meet the requirements of industry standards or national standards. Moreover, the surface of the drainage pipe is smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage pipes, and particularly relates to a sound-insulating U-PVC drainage pipe and a preparation method thereof. Background Art

[0002] PVC drainage pipes are mainly made of sanitary-grade polyvinyl chloride (PVC) resin, and are extruded and formed by a plastic extruder and injection molded by an injection molding machine after adding appropriate stabilizers, lubricants, fillers, colorants, etc. The production of the pipes is completed through processes such as cooling, curing, sizing, inspection, and packaging.

[0003] With the improvement of people's requirements for the quality of life and environmental protection, the requirements for PVC drainage pipes have also increased accordingly. In addition to requiring the performance of PVC drainage pipes to be safe and stable, people also pay attention to the noise problems of the pipes. Most common drainage pipes have simple structures and poor sound insulation effects. When water flows through quickly, the water hitting the pipe wall and squeezing the air easily generate continuous noises, destroying the quietness of the living room and seriously affecting people's daily life quality.

[0004] Expanded perlite is a lightweight porous material, which is formed by expanding natural ore perlite through high-temperature furnace burning. Expanded perlite is widely used in the construction field. Due to its lightweight and porous characteristics, expanded perlite can be used as a building heat insulation material. It has good heat insulation performance and can effectively reduce the conduction of temperature inside and outside the building and the loss of radiant heat, thereby reducing energy consumption. In addition, expanded perlite also has good sound absorption performance and can be used as a sound insulation material to effectively reduce indoor noise and provide a comfortable environment.

[0005] Although expanded perlite has good sound absorption performance, due to its strong water absorption (the sound absorption performance of expanded perlite will be greatly reduced after water absorption) and incompatibility with PVC resin, few people currently use expanded perlite for sound insulation and noise reduction in PVC drainage pipes. Summary of the Invention

[0006] Based on the above-mentioned prior art, the present invention provides a sound-insulating U-PVC drainage pipe and a preparation method thereof. The drainage pipe has good sound insulation performance and flame retardant performance, and other performances meet the requirements of industry standards or national standards, and the outer surface of the drainage pipe is smooth.

[0007] The technical solution adopted to achieve the above object of the present invention is as follows:

[0008] A sound-insulating U-PVC drainage pipe is co-extruded and compounded by an outer layer, a core layer, and an inner layer;

[0009] Both the outer layer and the inner layer are prepared from the following raw materials in parts by mass:

[0010]

[0011]

[0012] The core layer is prepared from raw materials in the following parts by mass:

[0013]

[0014] Further, the filler is selected from at least one of light calcium carbonate and talcum powder.

[0015] Further, the stabilizer is selected from at least one of organotin stabilizer and calcium-zinc stabilizer.

[0016] Further, the processing aid is ACR.

[0017] Further, the impact modifier is CPE.

[0018] Further, the lubricant is one of calcium stearate, polyethylene wax, Fischer-Tropsch wax, oxidized polyethylene wax, pentaerythritol stearate and glycerol monostearate, or a combination of several of them.

[0019] Further, the antioxidant is selected from at least one of antioxidant 264, antioxidant 2246 and antioxidant 1076.

[0020] A method for preparing the sound-insulating U-PVC drain pipe according to claim 1, comprising the following steps:

[0021] S1. Crushing expanded perlite to obtain expanded perlite powder;

[0022] S2. Mixing PVC resin, filler, stabilizer, processing aid, impact modifier, lubricant, titanium dioxide and antioxidant evenly to obtain an outer layer mixture or an inner layer mixture;

[0023] S3. Mixing PVC resin, expanded perlite, isopropyl dioleoyl oxy (dioctyl phosphatooxy) titanate, processing aid, stabilizer and lubricant evenly to obtain a core layer mixture;

[0024] S4. Adding the outer layer mixture and the inner layer mixture into an extruder for extrusion, adding the core layer mixture into another extruder for extrusion, then co-extruding and molding through a co-extrusion die, and then cooling and shaping to obtain the sound-insulating U-PVC drain pipe.

[0025] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0026] 1. The drain pipe of the present invention has three layers. Expanded perlite with good sound absorption performance is added to the core layer, so that the drain pipe has good sound insulation performance. At the same time, water-proof layers, i.e., U-PVC layers, are arranged on both sides of the core layer, solving the problem of strong water absorption of expanded perlite.

[0027] 2. The present invention uses isopropyl dioleoyl oxy (dioctyl phosphoric acid oxy) titanate as a coupling agent to modify the surface of expanded perlite, significantly improving the compatibility between the expanded perlite filler and PVC resin, making the expanded perlite filler more easily dispersed in the PVC resin. This not only improves the processing performance, making the outer surface of the prepared pipe smooth, but also greatly increases the addition amount of expanded perlite. Due to the substantial increase in the addition amount of expanded perlite, the sound insulation performance and flame retardancy of the drain pipe are significantly improved, and other performance meets the requirements of industry standards or national standards. Detailed implementation mode

[0028] The present invention will be described in detail below in conjunction with specific embodiments, but these embodiments are not construed as limiting the protection scope of the present invention in any sense.

[0029] The sources of raw materials used in the examples and comparative examples are as follows:

[0030] The PVC resin selected is SG-5 type PVC, purchased from Qilu Petrochemical, with the brand number S1000.

[0031] The expanded perlite is purchased from Kunshan Shihong Thermal Insulation Materials Co., Ltd.

[0032] Isopropyl dioleoyl oxy (dioctyl phosphoric acid oxy) titanate is purchased from Guangzhou Zhongjie Chemical Technology Co., Ltd., with the brand number ZJ-311.

[0033] Triisostearoyl titanate isopropyl ester is purchased from Hubei Fangde New Materials Co., Ltd., with the brand number C3205.

[0034] The manufacturer of CPE (chlorinated polyethylene) is Shandong Rike Chemical Co., Ltd., with the brand number 135A.

[0035] ACR 401 is purchased from Shandong Bangtai Petrochemical (Group) Co., Ltd.

[0036] The manufacturer of the organotin stabilizer is Hubei Benxing Chemical Industry, with the brand number SW977.

[0037] Glycerol monostearate is purchased from Jinan Huifengda Chemical Co., Ltd.

[0038] The brand number of the selected polyethylene wax is BN108, and the softening point is 108 °C.

[0039] Example 1

[0040] A sound-insulating U-PVC drainage pipe is co-extruded and compounded by an outer layer, a core layer and an inner layer;

[0041] The outer layer and the inner layer are both prepared from the following raw materials in parts by mass:

[0042]

[0043]

[0044] The core layer is prepared from the following raw materials in parts by mass:

[0045]

[0046] The preparation method of the above-mentioned sound-insulating U-PVC drainage pipe is as follows:

[0047] 1. Crush the expanded perlite to obtain expanded perlite powder;

[0048] 2. Add PVC resin, light calcium carbonate, organotin stabilizer, ACR401, CPE, glycerol monostearate, polyethylene wax, titanium dioxide and antioxidant 1076 into a high-speed mixer, control the rotation speed of the high-speed mixer at 900 r / min, and discharge the material to a cold mixer after the high-speed mixing temperature reaches 125 °C, and cool and mix to 40 °C to obtain the outer layer compound or the inner layer compound;

[0049] 3. Add PVC resin, expanded perlite, isopropyl dioleoyl oxy (dioctyl phosphooxy) titanate, ACR401, organotin stabilizer, glycerol monostearate and polyethylene wax into a high-speed mixer, control the rotation speed of the high-speed mixer at 900 r / min, and discharge the material to a cold mixer after the high-speed mixing temperature reaches 130 °C, and cool and mix to 45 °C to obtain the core layer compound;

[0050] 4. Extrude the outer layer compound and the inner layer compound into an extruder, extrude the core layer compound into another extruder, then co-extrude and form through a co-extrusion die, and then cool and shape to obtain the sound-insulating U-PVC drainage pipe.

[0051] Example 2

[0052] A sound-insulating U-PVC drainage pipe is co-extruded and compounded by an outer layer, a core layer and an inner layer;

[0053] The outer layer and the inner layer are both prepared from the following raw materials in parts by mass:

[0054]

[0055] The core layer is prepared from the following raw materials in parts by mass:

[0056]

[0057] The preparation method of the above sound-insulating U-PVC drainage pipe is as follows:

[0058] 1. Crush the expanded perlite to obtain expanded perlite powder;

[0059] 2. Add PVC resin, light calcium carbonate, organotin stabilizer, ACR401, CPE, glycerol monostearate, polyethylene wax, titanium dioxide and antioxidant 1076 into a high-speed mixer. Control the rotation speed of the high-speed mixer at 900 r / min. After the high-speed mixing temperature reaches 125°C, discharge the material into a cold mixer and cool it to 40°C to obtain the outer layer mixing material or the inner layer mixing material;

[0060] 3. Add PVC resin, expanded perlite, isopropyl dioleoyl oxy (dioctyl phosphooxy) titanate, ACR401, organotin stabilizer, glycerol monostearate and polyethylene wax into a high-speed mixer. Control the rotation speed of the high-speed mixer at 900 r / min. After the high-speed mixing temperature reaches 130°C, discharge the material into a cold mixer and cool it to 45°C to obtain the core layer mixing material;

[0061] 4. Extrude the outer layer mixing material and the inner layer mixing material in an extruder, extrude the core layer mixing material in another extruder, then carry out co-extrusion molding through a co-extrusion die, and then cool and shape to obtain the sound-insulating U-PVC drainage pipe.

[0062] Comparative Example 1

[0063] Compared with Example 1, only the raw materials for preparing the core layer are different, and the others are the same.

[0064] In this comparative example, the core layer is prepared from the following raw materials in parts by mass:

[0065]

[0066] Comparative Example 2

[0067] Compared with Comparative Example 1, the added amount of expanded perlite is different, and the others are the same.

[0068] In this comparative example, the core layer is prepared from the following raw materials in parts by mass:

[0069]

[0070] Comparative Example 3

[0071] Compared with Comparative Example 1, the added amount of expanded perlite is different, and the others are the same.

[0072] In this comparative example, the core layer is prepared from the following raw materials in parts by mass:

[0073]

[0074]

[0075] The drain pipes prepared in Examples 1-2 and Comparative Examples 1-3 were tested for the flowing water noise decibel value (tested with reference to CJ / T 312-2009 "Test Method for Noise of Building Drainage Pipe System"), limiting oxygen index (specifically tested with reference to JB / T 12875-2016 "Flame Retardant Polyolefin Heat Shrinkable Tubing"), impact resistance (specifically tested with reference to GB / T 18743.1-2022 "Determination of Izod Impact Strength of Thermoplastic Pipe") and other performance parameters, and the appearance of the pipe was observed. The test results are shown in the following table:

[0076]

[0077] As can be seen from the above table, when isopropyl dioleoyl titanate (dioctyl phosphate acyl titanate) is used as the coupling agent, compared with using other coupling agents such as isopropyl tri-stearoyl titanate as the coupling agent, the addition amount of expanded perlite can be significantly increased. Due to the significant increase in the addition amount of expanded perlite, the sound insulation effect of the drain pipe is significantly increased, and its flame retardant performance is also improved, and it does not affect the appearance of the drain pipe.

Claims

1. A sound-insulating U-PVC drainage pipe, characterized in that: It is co-extruded and compounded by an outer layer, a core layer and an inner layer; Both the outer layer and the inner layer are prepared from the following raw materials in parts by mass: PVC resin: 100 parts Filler: 8 - 12 parts Stabilizer: 3 - 6 parts Processing aid: 0.5 - 1.5 parts Impact resistance aid: 8 - 16 parts Lubricant: 0.8 - 1.8 parts Titanium dioxide: 1 - 3 parts Antioxidant: 0.4 - 1.2 parts; The core layer is prepared from the following raw materials in parts by mass: PVC resin: 100 parts Expanded perlite: 50 - 60 parts, Isopropyl dioleoyl oxy (dioctyl phosphatooxy) titanate: 4 - 8 parts Processing aid: 1 - 2 parts Stabilizer: 2 - 5 parts Lubricant: 0.3 - 1.5 parts; The processing aid is ACR401; The impact resistance aid is CPE.

2. The sound-insulating U-PVC drainage pipe according to claim 1, wherein: The filler is selected from at least one of light calcium carbonate and talcum powder.

3. The sound-insulating U-PVC drainage pipe according to claim 1, characterized in that: The stabilizer is selected from at least one of organic tin stabilizer and calcium zinc stabilizer.

4. The sound-insulating U-PVC drainage pipe according to claim 1, characterized in that: The lubricant is one of calcium stearate, polyethylene wax, Fischer-Tropsch wax, oxidized polyethylene wax, pentaerythritol stearate and glycerol monostearate, or a combination of several of them.

5. The sound-insulating U-PVC drain pipe according to claim 1, characterized in that: The antioxidant is selected from at least one of antioxidant 264, antioxidant 2246 and antioxidant 1076.

6. A method for preparing the sound-insulating U-PVC drainage pipe according to claim 1, characterized in that It includes the following steps: S1. Crush the expanded perlite to obtain expanded perlite powder; S2. Mix the PVC resin, filler, stabilizer, processing aid, impact resistance aid, lubricant, titanium dioxide and antioxidant evenly to obtain the outer layer mixed material or the inner layer mixed material; S3. Mix the PVC resin, expanded perlite, isopropyl dioleoyl oxy (dioctyl phosphatooxy) titanate, processing aid, stabilizer and lubricant evenly to obtain the core layer mixed material; S4. Add the outer layer mixed material and the inner layer mixed material into an extruder for extrusion, add the core layer mixed material into another extruder for extrusion, then carry out co-extrusion molding through a co-extrusion die, and then cool and shape to obtain the sound-insulating U-PVC drain pipe.

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