Pipeline with uniformly formed pipe wall and preparation method thereof
By adding modified calcium carbonate whiskers to HDPE pipes, the problem of uneven pipe wall thickness was solved, the fluidity and strength of the pipes were improved, and the high-pressure water transmission requirements were met.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-04-03
AI Technical Summary
HDPE pipes suffer from uneven wall thickness during extrusion molding, resulting in low quality stability and easy breakage at weak points, making it difficult to meet the requirements of high-pressure water transmission.
A composite material, including HDPE, color masterbatch, additives, and modified calcium carbonate whiskers, is used to prepare modified calcium carbonate whiskers by mixing water, calcium hydroxide, sodium cocoyl glutamate, isopentenyl polyoxyethylene ether, and magnesium gluconate in a specific ratio. This improves the flowability of the composite material and the strength of HDPE.
It significantly improves the fluidity and dimensional stability of the pipeline, enhances its pressure-bearing capacity, and meets the requirements for high-pressure water transmission.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of pipelines, and in particular to a pipeline with uniformly formed pipe walls and a method for preparing the same. Background Technology
[0002] HDPE pipes are one of the commonly used water transmission pipes. Although HDPE pipes are suitable for high-pressure water supply systems and underground pipeline projects, in the actual production process, the fluidity of ordinary HDPE material after hot melting is not good. During extrusion molding, the pipe wall thickness will fluctuate greatly, resulting in low pipe quality stability and easy occurrence of thin-walled weak sections. With the development of technology, the pressure-bearing capacity requirements for water transmission pipes are getting higher and higher. Cracks and damage are prone to occur at the thin-walled sections, making it difficult to meet the usage requirements. Therefore, there is still room for improvement. Summary of the Invention
[0003] To improve the pressure-bearing capacity of pipelines, this application provides a pipeline with uniformly formed pipe walls and a method for preparing the same.
[0004] In a first aspect, this application provides a pipe with uniformly formed pipe wall, employing the following technical solution: A pipe with uniformly shaped wall is obtained by extrusion molding of a composite material, wherein the composite material comprises the following components in parts by weight: 94-95 parts HDPE; 4.5-5.5 parts of color masterbatch; 0.044-0.056 parts of auxiliary agent; 12-14 parts of modified calcium carbonate whiskers; The method for preparing the calcium carbonate whiskers is as follows: Step 1), mix water and calcium hydroxide to obtain a calcium hydroxide suspension; Step 2), mix water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate to obtain a crystal form control solution; Step 3) Mix the calcium hydroxide suspension and the crystal form control solution to obtain a mixed solution; Step 4): Heat the mixture to 80-90℃, introduce carbon dioxide, and react until the pH of the mixture is ≤8. Filter out the precipitate, dry it, and obtain calcium carbonate whiskers. Step 5), mix the ethanol aqueous solution and the silane coupling agent to obtain the modified solution; Step 6) Mix calcium carbonate whiskers and modification solution, stir for 20-25 minutes, and then dry at 100-120℃ to obtain modified calcium carbonate whiskers.
[0005] By adopting the above technical solution and adding modified calcium carbonate whiskers to the composite material, the fluidity of the composite material during the extrusion process is significantly improved, thereby significantly reducing the dimensional fluctuation and wall thickness fluctuation of the extruded pipe, and thus improving the overall quality stability of the pipe.
[0006] By compounding sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate into a crystal form control solution, the crystal morphology of calcium carbonate can be effectively induced, giving calcium carbonate whiskers a special crystal structure. This significantly improves the modification effect of modified calcium carbonate whiskers on HDPE, effectively increasing the strength of HDPE and further enhancing the pressure resistance of the resulting pipes, thus better meeting the requirements of higher pressure water transmission.
[0007] Preferably, in step 1), the mass ratio of water to calcium hydroxide is 1000:7.4-7.6.
[0008] By adopting the above technical solution and specifically selecting the mass ratio of water and calcium hydroxide, the reaction produces calcium carbonate whiskers with better effect and higher quality.
[0009] Preferably, in step 2), the mass ratio of water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate is 1000:60-70:40-50:414-416.
[0010] By adopting the above technical solution and specifically selecting the mass ratio of water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate, the effect of inducing calcium carbonate crystallization morphology is better, and calcium carbonate whiskers with special crystal structures can be better obtained, thereby significantly improving the effect of modified HDPE.
[0011] Preferably, in step 3), the mass ratio of calcium hydroxide suspension to crystal form control solution is 1:0.24-0.26.
[0012] By adopting the above technical solution and specifically selecting the mass ratio of calcium hydroxide suspension and crystal form control solution, the effect of inducing calcium carbonate crystal morphology is relatively stable, and raw material waste is reduced, thus controlling costs.
[0013] Preferably, in step 4), the carbon dioxide flow rate is 50-60 mL / min.
[0014] By adopting the above technical solution and specifically controlling the amount of carbon dioxide introduced, calcium carbonate whiskers with special structures can be formed better, resulting in a better modification effect of modified calcium carbonate whiskers on HDPE.
[0015] Preferably, in step 5), the mass concentration of the ethanol aqueous solution is 90-95%, and the mass ratio of the ethanol aqueous solution to the silane coupling agent is 96-98:2-4.
[0016] By adopting the above technical solution, the surface modification effect of calcium carbonate whiskers is better, which improves the compatibility between modified calcium carbonate whiskers and HDPE, and makes the modification effect of modified calcium carbonate whiskers on HDPE better.
[0017] Preferably, in step 6), the mass ratio of calcium carbonate whiskers to the modified liquid is 100:48-52.
[0018] By adopting the above technical solution, the surface modification effect of calcium carbonate whiskers can be better guaranteed, thereby making the modified calcium carbonate whiskers have a better modification effect on HDPE.
[0019] Preferably, the additive is a compound of antioxidant, anti-aging agent and anti-ultraviolet agent in a mass ratio of 0.008-0.012: 0.018-0.022: 0.018-0.022.
[0020] By adopting the above technical solutions and adding antioxidants, anti-aging agents, and UV stabilizers, the lifespan of pipelines can be significantly improved, resulting in higher economic value.
[0021] Secondly, this application provides a method for preparing a pipe with uniformly formed pipe wall, using the following technical solution: A method for preparing a pipe with uniformly formed pipe wall as described above includes the following steps: Step 01): Mix HDPE, color masterbatch, additives, and modified calcium carbonate whiskers evenly to obtain a premix. Step 02) The premix is extruded through an extrusion device to form a pipe with a uniformly shaped wall.
[0022] By adopting the above technical solution, the pipe with uniform wall formation is produced, which has high pressure resistance, relatively stable quality, and can better meet the needs of high-pressure water transmission, and has high application prospects.
[0023] In summary, this application has the following beneficial effects: 1. Because this application adds modified calcium carbonate whiskers to the composite material, the fluidity of the composite material during the extrusion process is significantly improved, thereby significantly reducing the dimensional fluctuation and wall thickness fluctuation of the extruded pipe. At the same time, it can effectively improve the strength of HDPE, thereby improving the overall quality stability of the pipe. The pressure bearing capacity of the pipe is further improved, which can better meet the requirements of higher pressure water transmission.
[0024] 2. In this application, the preferred method is to select the specific mass ratio of water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate to induce calcium carbonate crystallization, which is more effective in obtaining calcium carbonate whiskers with special crystal structures, thereby significantly improving the effect of modified HDPE. Detailed Implementation
[0025] The present application will be further described in detail below with reference to the embodiments. Example 1
[0026] A pipe with uniformly formed wall is prepared by the following steps: Step 01): Add 94kg HDPE, 4.5kg color masterbatch, 0.008kg antioxidant, 0.018kg anti-aging agent, 0.018kg UV stabilizer, and 12kg modified calcium carbonate whiskers into a stirred tank. Heat to 70℃, rotate at 60r / min, and stir for 20min until homogeneous to obtain a premix.
[0027] Step 02): The premix is fed into a twin-screw extruder and extruded. The processing temperatures of zones I-XI of the twin-screw extruder are set sequentially as follows: 200℃, 205℃, 210℃, 215℃, 215℃, 220℃, 220℃, 225℃, 225℃, 230℃, 230℃. The main screw speed is 400 rpm, and the water tank temperature during cooling is 45℃. A pipe with a uniform wall shape, an outer diameter of 50 mm and a wall thickness of 5 mm, is obtained.
[0028] HDPE is a blend of HDPE1 and HDPE2 in a mass ratio of 53:41.
[0029] HDPE1 was purchased from Basel, model 3488.
[0030] HDPE2 was purchased from Daehan, model VH035.
[0031] The masterbatch is a carbon black masterbatch, purchased from Maokang Materials Technology Co., Ltd., model 571L.
[0032] The antioxidant was purchased from Yuansheng, model YS-206.
[0033] The anti-aging agent was purchased from Disheng Technology, model UV-328.
[0034] The UV stabilizer was purchased from Disheng Technology, model UV-801.
[0035] The modified calcium carbonate whiskers were prepared in-house using the following method: Step 1): Mix 1000 kg of water and 7.4 kg of calcium hydroxide to obtain a calcium hydroxide suspension.
[0036] Step 2) Mix 1000 kg of water, 60 kg of sodium cocoyl glutamate, 40 kg of isopentenyl alcohol polyoxyethylene ether, and 414 kg of magnesium gluconate to obtain a crystal form control solution.
[0037] Step 3) Mix 1 kg of calcium hydroxide suspension and 0.24 kg of crystal form control solution to obtain a mixed solution.
[0038] Step 4): Heat the mixture and keep it at 80°C. Introduce carbon dioxide gas into the mixture at a rate of 50 mL / min. React until the pH of the mixture is ≤8. Filter out the precipitate and dry it at 100°C for 1 hour to obtain calcium carbonate whiskers.
[0039] Step 5) Mix 96 kg of 90% ethanol aqueous solution and 2 kg of silane coupling agent to obtain the modified solution.
[0040] Step 6) Add 100 kg of calcium carbonate whiskers into a mixer and stir continuously at 300 r / min. Then spray 48 kg of modification liquid into the mixer. After all the liquid has been sprayed in, maintain the speed at 300 r / min and stir for 20 min. Then dry the calcium carbonate whiskers at 100℃ for 1 h to obtain modified calcium carbonate whiskers.
[0041] Sodium cocoyl glutamate was purchased from Hubei Maidehao Biotechnology Co., Ltd.
[0042] The isopentenyl alcohol polyoxyethylene ether was purchased from Hebei Shengchenglong Chemical Co., Ltd.
[0043] Magnesium gluconate was purchased from Hebei Kelongduo Biotechnology Co., Ltd.
[0044] The silane coupling agent is silane coupling agent KH550, which was purchased from Yunsheng Chemical (Shandong) Co., Ltd. Example 2
[0045] A pipe with uniformly formed wall is prepared by the following steps: Step 01): Add 94.5 kg HDPE, 5 kg color masterbatch, 0.01 kg antioxidant, 0.02 kg anti-aging agent, 0.02 kg UV stabilizer, and 13 kg modified calcium carbonate whiskers into a mixing tank, heat to 70°C, rotate at 60 r / min, stir for 20 min, and mix evenly to obtain a premix.
[0046] Step 02): The premix is fed into a twin-screw extruder and extruded. The processing temperatures of zones I-XI of the twin-screw extruder are set sequentially as follows: 200℃, 205℃, 210℃, 215℃, 215℃, 220℃, 220℃, 225℃, 225℃, 230℃, 230℃. The main screw speed is 400 rpm, and the water tank temperature during cooling is 45℃. A pipe with a uniform wall shape, an outer diameter of 50 mm and a wall thickness of 5 mm, is obtained.
[0047] HDPE is a compound of HDPE1 and HDPE2 in a mass ratio of 53.5:41.
[0048] HDPE1 was purchased from Basel, model 3488.
[0049] HDPE2 was purchased from Daehan, model VH035.
[0050] The masterbatch is a carbon black masterbatch, purchased from Maokang Materials Technology Co., Ltd., model 571L.
[0051] The antioxidant was purchased from Yuansheng, model YS-206.
[0052] The anti-aging agent was purchased from Disheng Technology, model UV-328.
[0053] The UV stabilizer was purchased from Disheng Technology, model UV-801.
[0054] The modified calcium carbonate whiskers were prepared in-house using the following method: Step 1): Mix 1000 kg of water and 7.5 kg of calcium hydroxide to obtain a calcium hydroxide suspension.
[0055] Step 2) Mix 1000 kg of water, 65 kg of sodium cocoyl glutamate, 45 kg of isopentenyl alcohol polyoxyethylene ether, and 415 kg of magnesium gluconate to obtain a crystal form control solution.
[0056] Step 3) Mix 1 kg of calcium hydroxide suspension and 0.25 kg of crystal form control solution to obtain a mixed solution.
[0057] Step 4): Heat the mixture and keep it at a constant temperature of 85°C. Introduce carbon dioxide gas into the mixture at a rate of 55 mL / min. React until the pH of the mixture is ≤8. Filter out the precipitate and dry it at 100°C for 1 hour to obtain calcium carbonate whiskers.
[0058] Step 5) Mix 97 kg of 95% ethanol aqueous solution and 3 kg of silane coupling agent to obtain the modified solution.
[0059] Step 6) Add 100 kg of calcium carbonate whiskers into a mixer and stir continuously at 300 r / min. Then spray 50 kg of modification liquid into the mixer. After all the liquid has been sprayed in, maintain the speed at 300 r / min and stir for 25 min. Then dry the calcium carbonate whiskers at 110℃ for 1 h to obtain modified calcium carbonate whiskers.
[0060] Sodium cocoyl glutamate was purchased from Hubei Maidehao Biotechnology Co., Ltd.
[0061] The isopentenyl alcohol polyoxyethylene ether was purchased from Hebei Shengchenglong Chemical Co., Ltd.
[0062] Magnesium gluconate was purchased from Hebei Kelongduo Biotechnology Co., Ltd.
[0063] The silane coupling agent is silane coupling agent KH550, which was purchased from Yunsheng Chemical (Shandong) Co., Ltd. Example 3
[0064] A pipe with uniformly formed wall is prepared by the following steps: Step 01): Add 95kg HDPE, 5.5kg color masterbatch, 0.012kg antioxidant, 0.022kg anti-aging agent, 0.022kg UV stabilizer, and 14kg modified calcium carbonate whiskers into a mixing tank, heat to 70℃, rotate at 60r / min, stir for 20min, and mix evenly to obtain a premix.
[0065] Step 02): The premix is fed into a twin-screw extruder and extruded. The processing temperatures of zones I-XI of the twin-screw extruder are set sequentially as follows: 200℃, 205℃, 210℃, 215℃, 215℃, 220℃, 220℃, 225℃, 225℃, 230℃, 230℃. The main screw speed is 400 rpm, and the water tank temperature during cooling is 45℃. A pipe with a uniform wall shape, an outer diameter of 50 mm and a wall thickness of 5 mm, is obtained.
[0066] HDPE is a blend of HDPE1 and HDPE2 in a mass ratio of 54:41.
[0067] HDPE1 was purchased from Basel, model 3488.
[0068] HDPE2 was purchased from Daehan, model VH035.
[0069] The masterbatch is a carbon black masterbatch, purchased from Maokang Materials Technology Co., Ltd., model 571L.
[0070] The antioxidant was purchased from Yuansheng, model YS-206.
[0071] The anti-aging agent was purchased from Disheng Technology, model UV-328.
[0072] The UV stabilizer was purchased from Disheng Technology, model UV-801.
[0073] The modified calcium carbonate whiskers were prepared in-house using the following method: Step 1): Mix 1000 kg of water and 7.6 kg of calcium hydroxide to obtain a calcium hydroxide suspension.
[0074] Step 2) Mix 1000 kg of water, 70 kg of sodium cocoyl glutamate, 50 kg of isopentenyl alcohol polyoxyethylene ether, and 416 kg of magnesium gluconate to obtain a crystal form control solution.
[0075] Step 3) Mix 1 kg of calcium hydroxide suspension and 0.26 kg of crystal form control solution to obtain a mixed solution.
[0076] Step 4): Heat the mixture and keep it at a constant temperature of 90°C. Introduce carbon dioxide gas into the mixture at a flow rate of 60 mL / min. React until the pH of the mixture is ≤8. Filter out the precipitate and dry it at 100°C for 1 hour to obtain calcium carbonate whiskers.
[0077] Step 5) Mix 98 kg of 95% ethanol aqueous solution and 4 kg of silane coupling agent to obtain the modified solution.
[0078] Step 6) Add 100 kg of calcium carbonate whiskers into a mixer and stir continuously at 300 r / min. Then spray 52 kg of modification liquid into the mixer. After all the liquid has been sprayed in, maintain the speed at 300 r / min and stir for 25 min. Then dry the calcium carbonate whiskers at 120℃ for 1 h to obtain modified calcium carbonate whiskers.
[0079] Sodium cocoyl glutamate was purchased from Hubei Maidehao Biotechnology Co., Ltd.
[0080] The isopentenyl alcohol polyoxyethylene ether was purchased from Hebei Shengchenglong Chemical Co., Ltd.
[0081] Magnesium gluconate was purchased from Hebei Kelongduo Biotechnology Co., Ltd.
[0082] The silane coupling agent is silane coupling agent KH550, which was purchased from Yunsheng Chemical (Shandong) Co., Ltd.
[0083] Comparative Example 1 A pipe with uniformly formed wall, differing from Example 2 only in that: Sodium cocoyl glutamate was replaced with an equal amount of sodium dodecyl sulfate.
[0084] Sodium dodecyl sulfate was purchased from Jinan Daorong Chemical Co., Ltd.
[0085] Comparative Example 2 A pipe with uniformly formed wall, differing from Example 2 only in that: Sodium dodecylbenzenesulfonate was used to replace isopentenyl alcohol polyoxyethylene ether in an equal amount.
[0086] Sodium dodecylbenzenesulfonate was purchased from Nanjing Milan Chemical Co., Ltd.
[0087] Comparative Example 3 A pipe with uniformly formed wall, differing from Example 2 only in that: Magnesium gluconate was replaced with an equal amount of magnesium acetate.
[0088] Magnesium acetate was purchased from Shandong Chuangli New Materials Co., Ltd.
[0089] Comparative Example 4 A pipe with uniformly formed wall, differing from Example 2 only in that: Sodium dodecyl sulfate was used to replace sodium cocoyl glutamate in equal amounts, sodium dodecylbenzene sulfonate was used to replace isopentenyl polyoxyethylene ether in equal amounts, and magnesium acetate was used to replace magnesium gluconate in equal amounts.
[0090] Sodium dodecyl sulfate was purchased from Jinan Daorong Chemical Co., Ltd.
[0091] Sodium dodecylbenzenesulfonate was purchased from Nanjing Milan Chemical Co., Ltd.
[0092] Magnesium acetate was purchased from Shandong Chuangli New Materials Co., Ltd.
[0093] Experiment 1 Pipes prepared in each embodiment and comparative example were randomly sampled, with a sampling length of 1000 mm. The wall thickness of the pipe sample was measured at various points along the circumference using an online wall thickness testing device. The maximum and minimum wall thickness values in the circumferential direction were recorded as the maximum and minimum wall thicknesses, respectively. The wall thickness difference was calculated using the following formula: Wall thickness difference = maximum wall thickness - minimum wall thickness.
[0094] Experiment 2 Pipes prepared in each embodiment and comparative example were randomly sampled, with a pipe sample length of 1000 mm.
[0095] The hydrostatic strength of the pipe samples was tested according to GB / T 13663.2-2018 "Polyethylene (PE) Piping Systems for Water Supply - Part 2: Pipes".
[0096] Test conditions: Test temperature: 80℃; Test time: 165h; Ring stress: 5.4MPa.
[0097] Experiment 3 The premixes obtained in step 1) of each embodiment and comparative example were used to prepare test samples according to GB / T1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics" and the tensile strength was tested.
[0098] Test conditions: Type 1A sample was used for testing, and the test speed was 50 mm / min.
[0099] The detailed experimental data for Experiments 1-3 are shown in Table 1.
[0100] Table 1
[0101] According to Table 1, the calcium carbonate whiskers prepared by adding a crystal form control liquid composed of sodium cocoyl glutamate, isopentenyl polyoxyethylene ether, and magnesium gluconate in each embodiment can significantly improve the strength of the composite material and provide dimensional stability of the basic product. The resulting pipes are more stable, less prone to breakage, and better meet the requirements of high-pressure water transportation.
[0102] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A pipe with uniformly formed pipe wall, characterized in that: Obtained by extrusion molding of a composite material, the composite material comprising the following components in parts by weight: 94-95 parts HDPE; 4.5-5.5 parts of color masterbatch; 0.044-0.056 parts of auxiliary agent; 12-14 parts of modified calcium carbonate whiskers; The method for preparing the calcium carbonate whiskers is as follows: Step 1), mix water and calcium hydroxide to obtain a calcium hydroxide suspension; Step 2), mix water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate to obtain a crystal form control solution; Step 3) Mix the calcium hydroxide suspension and the crystal form control solution to obtain a mixed solution; Step 4): Heat the mixture to 80-90℃, introduce carbon dioxide, and react until the pH of the mixture is ≤8. Filter out the precipitate, dry it, and obtain calcium carbonate whiskers. Step 5), mix the ethanol aqueous solution and the silane coupling agent to obtain the modified solution; Step 6) Mix calcium carbonate whiskers and modification solution, stir for 20-25 minutes, and then dry at 100-120℃ to obtain modified calcium carbonate whiskers.
2. The pipe with uniformly formed wall as described in claim 1, characterized in that: In step 1), the mass ratio of water to calcium hydroxide is 1000:7.4-7.
6.
3. A pipe with uniformly formed wall according to claim 2, characterized in that: In step 2), the mass ratio of water, sodium cocoyl glutamate, isopentenyl alcohol polyoxyethylene ether, and magnesium gluconate is 1000:60-70:40-50:414-416.
4. A pipe with uniformly formed wall according to claim 3, characterized in that: In step 3), the mass ratio of calcium hydroxide suspension to crystal form control solution is 1:0.24-0.
26.
5. A pipe with uniformly formed wall according to claim 4, characterized in that: In step 4), the carbon dioxide flow rate is 50-60 mL / min.
6. A pipe with uniformly formed wall according to any one of claims 1-5, characterized in that: In step 5), the mass concentration of the ethanol aqueous solution is 90-95%, and the mass ratio of the ethanol aqueous solution to the silane coupling agent is 96-98:2-4.
7. A pipe with uniformly formed wall according to claim 6, characterized in that: In step 6), the mass ratio of calcium carbonate whiskers to the modified liquid is 100:48-52.
8. A pipe with uniformly formed wall according to claim 1, characterized in that: The additive is a compound of antioxidants, anti-aging agents and anti-ultraviolet agents in a mass ratio of 0.008-0.012: 0.018-0.022: 0.018-0.
022.
9. A method for preparing a pipe with uniformly formed pipe wall according to any one of claims 1-8, characterized in that: Includes the following steps: Step 01): Mix HDPE, color masterbatch, additives, and modified calcium carbonate whiskers evenly to obtain a premix. Step 02) The premix is extruded through an extrusion device to form a pipe with a uniformly shaped wall.