Superconductive anti-scaling PE-RT (polyethylene of raised temperature resistance) floor heating pipe and preparation method thereof
By using modified boron nitride and aluminum trioxide in PE-RT floor heating pipes, combined with fluorinated polyacrylate and other materials, the problems of low thermal conductivity and easy scaling of PE-RT floor heating pipes are solved, and high-efficiency thermal conductivity is achieved and anti-fouling effect extend the service life of the pipe.
Patent Information
- Application Number
- CN202411358716.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-02-07
AI Technical Summary
The existing PE-RT floor heating pipes have low thermal conductivity, large heat loss, long heating time, and easy scaling on the inner wall of the pipe, shortening the service life.
Boron nitride and aluminum trioxide are used as thermal conductivity materials and combined with fluorinated polyacrylate and other materials. The thermal conductivity and anti-fouling properties of the materials are improved by modification treatment, and a color master with super-thermal conductivity and anti-fouling function is prepared. , used to prepare PE-RT floor heating pipes.
It significantly improves the thermal conductivity and anti-fouling performance of PE-RT floor heating pipes, extends the service life of the pipes, and complies with the relevant requirements of GB/T 28799.2-2020.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of plastic processing, and specifically relates to a super-thermal conductive anti-scaling PE-RT floor heating pipe and a preparation method thereof. Background Art
[0002] PE-RT floor heating pipes are suitable for hot and cold water pipe systems, including hot and cold water in civil and industrial buildings, drinking water and heating systems, hot spring pipe systems and central heating secondary pipe systems, etc., due to their light weight, low price, safety and good stability. However, the thermal conductivity of ordinary PE-RT floor heating pipes is only 0.2-0.3W / cm.k, resulting in large heat loss and long heating time. At the same time, after 3 to 5 years of use, the inner wall of ordinary PE-RT floor heating pipes will be scaled due to scale, microorganisms and rust deposition, which will shorten the service life of PE-RT floor heating pipes.
[0003] Therefore, it is necessary to develop a super conductive, anti-scaling PE-RT floor heating pipe, which has fast heat conduction during floor heating, can improve the heat transfer effect after hot water passes through the pipe, and the inner wall of the pipe is not easy to scale, thereby extending the service life of the pipe. Summary of the invention
[0004] Based on the above-mentioned prior art, the present invention provides a superconducting and anti-scaling PE-RT floor heating pipe and a preparation method thereof. The floor heating pipe of the present invention has high thermal conductivity, fast heat conduction speed, good self-cleaning and anti-scaling performance, and other properties meet the relevant requirements of GB / T 28799.2-2020.
[0005] The technical solution adopted to achieve the above-mentioned purpose of the present invention is:
[0006] A masterbatch with super thermal conductivity and anti-scaling function is prepared from the following raw materials:
[0007]
[0008] Furthermore, the melt index of the heat-resistant polyethylene is 2 to 30 g / 10 min.
[0009] Further, the preparation method of the fluorinated polyacrylate is as follows:
[0010] Under nitrogen protection, deionized water, emulsifier and 1 / 3-1 / 2 of the total mass of potassium persulfate solution were added to the reaction bottle, heated to 50-70°C, dodecafluoroheptyl methacrylate, methyl methacrylate and the remaining potassium persulfate solution were added dropwise, and after the addition was completed, the reaction was continued at 50-70°C for 3-5h, the unreacted monomers were removed under reduced pressure, and the mixture was filtered to obtain fluoropolyacrylate.
[0011] Furthermore, the emulsifier is a mixture of sodium perfluorononenyloxybenzene sulfonate and fatty alcohol polyoxyethylene ether, and the mass ratio of sodium perfluorononenyloxybenzene sulfonate to fatty alcohol polyoxyethylene ether is 1:1-2.
[0012] Furthermore, the pigment is one of Pigment Yellow 191, Titanium Dioxide and Pigment Red 104.
[0013] Furthermore, the antioxidant is a combination of antioxidant 1010 and antioxidant 168.
[0014] Furthermore, the modified boron nitride is obtained by modifying boron nitride with a silane coupling agent, and the modified aluminum oxide is obtained by modifying aluminum oxide with a silane coupling agent.
[0015] A method for preparing a masterbatch with super thermal conductivity and anti-scaling function, characterized by comprising the following steps:
[0016] 1. Evenly mix the heat-resistant polyethylene, pigment, modified boron nitride, modified aluminum oxide, antioxidant and fluorinated polyacrylate to obtain a mixed material;
[0017] 2. Add the mixed ingredients into a twin-screw extruder, extrude and granulate, and obtain the masterbatch with super thermal conductivity and anti-scaling function.
[0018] A super-thermal conductive and anti-scaling PE-RT floor heating pipe is prepared from the following raw materials: heat-resistant polyethylene and the masterbatch with super-thermal conductive and anti-scaling function as claimed in claim 1, the mass of which is 1-4% of the heat-resistant polyethylene.
[0019] A method for preparing a superconducting anti-scaling PE-RT floor heating pipe comprises the following steps:
[0020] 1. Evenly mix the heat-resistant polyethylene and the masterbatch with super-thermal conductivity and anti-scaling function as claimed in claim 1;
[0021] 2. Add the mixed material in step 9.1 into a twin-screw extruder, extrude and shape it, and cool it to obtain the superconducting anti-scaling PE-RT floor heating pipe.
[0022] Compared with the prior art, the advantages and beneficial effects of the present invention are:
[0023] 1. The present invention uses both boron nitride and aluminum oxide as thermal conductive materials. On the one hand, boron nitride can not only increase the thermal conductivity of PE-RT floor heating pipes, but also improve the mechanical properties and heat resistance of PE-RT floor heating pipes. On the other hand, aluminum oxide can not only improve the heat resistance of PE-RT floor heating pipes, but also improve the scratch resistance of PE-RT floor heating pipes, which is convenient for the transportation and installation of PE-RT floor heating pipes.
[0024] 2. The present invention selects fluorinated polyacrylate as an anti-scaling agent, which, in combination with boron nitride and aluminum oxide of silane coupling agents, can not only be evenly dispersed in the heat-resistant polyethylene, but also improve the thermal conductivity and anti-fouling properties of the PE-RT floor heating pipe. DETAILED DESCRIPTION
[0025] The present invention is described in detail below with reference to specific embodiments.
[0026] The sources of the raw materials used in the embodiments and comparative examples are as follows:
[0027] The preparation method of the modified boron nitride used is as follows:
[0028] Take 8 parts by mass of boron nitride, dissolve γ-glycidyloxypropyltrimethoxysilane with a mass of 2% of the mass of boron nitride in anhydrous ethanol, then mix with boron nitride, stir magnetically for 20 minutes until uniform, then oscillate and disperse in an ultrasonic oscillator for 40 minutes, and dry at 80°C to obtain modified boron nitride.
[0029] The preparation method of the modified aluminum oxide used is as follows:
[0030] Take 8 parts by mass of aluminum oxide, dissolve γ-glycidyloxypropyltrimethoxysilane (2% by mass of aluminum oxide) in anhydrous ethanol, then mix with aluminum oxide, stir magnetically for 20 minutes until uniform, then oscillate and disperse in an ultrasonic oscillator for 40 minutes, and dry at 80°C to obtain modified aluminum oxide.
[0031] The preparation method of the fluorinated polyacrylate used is as follows:
[0032] Under nitrogen protection, 100 mL of deionized water, an emulsifier and 1 / 3 of the total mass of potassium persulfate solution were added to the reaction bottle, heated to 60°C, and dodecafluoroheptyl methacrylate, methyl methacrylate and the remaining potassium persulfate solution were added dropwise. After the addition was completed, the reaction was continued at 60°C for 4 hours, the unreacted monomers were removed under reduced pressure, and the mixture was filtered to obtain fluoropolyacrylate.
[0033] Example 1
[0034] A masterbatch with super thermal conductivity and anti-scaling function is prepared from the following raw materials:
[0035]
[0036] The preparation method of the above-mentioned masterbatch with super thermal conductivity and anti-scaling function is as follows:
[0037] 1. Evenly mix heat-resistant polyethylene, pigment yellow 191, modified boron nitride, modified aluminum oxide, antioxidant 1010, antioxidant 168, and fluorinated polyacrylate to obtain a mixed material;
[0038] S2. Add the mixed ingredients into a high-speed twin-screw extruder with a screw aspect ratio of 1:44, and set the parameters of the twin-screw extruder as follows: main engine speed 500 rpm / min, feed speed 50 rpm / min, die head temperature 210°C, barrel zone 1 170°C, zone 2 175°C, zone 3 170°C, zone 4 170°C, zone 5 175°C, zone 6 175°C, zone 7 180°C, zone 8 180°C, zone 9 210°C, the extruded material strips are cooled in a water trough and cut to obtain the masterbatch with superthermal and anti-scaling function.
[0039] A super thermal conductive and anti-scaling PE-RT floor heating pipe is prepared from the following raw materials: heat-resistant polyethylene and a masterbatch with super thermal conductive and anti-scaling function whose mass is 2% of the heat-resistant polyethylene.
[0040] A method for preparing a superconducting anti-scaling PE-RT floor heating pipe comprises the following steps:
[0041] 1. Evenly mix the heat-resistant polyethylene and the masterbatch with super thermal conductivity and anti-scaling function.
[0042] 2. Add the mixture of step 1 into a single screw extruder, and set the parameters of the single screw extruder as follows: barrel zone 185°C, zone 2 195°C, zone 3 205°C, zone 4 205°C, zone 5 205°C, die head temperature 202°C, main engine speed 86r / min, main engine torque 73.9%, traction speed 880cm / min, vacuum degree 0.022. Extrusion molding, cooling, to obtain the superconducting anti-scaling PE-RT floor heating pipe.
[0043] Example 2
[0044] A masterbatch with super thermal conductivity and anti-scaling function is prepared from the following raw materials:
[0045]
[0046] The preparation method of the masterbatch with super thermal conductivity and anti-scaling function in this embodiment is the same as that in Example 1.
[0047] A super thermal conductive and anti-scaling PE-RT floor heating pipe is prepared from the following raw materials: heat-resistant polyethylene and a masterbatch with super thermal conductive and anti-scaling function whose mass is 1% of the heat-resistant polyethylene.
[0048] The superconducting anti-scaling PE-RT floor heating pipe in this embodiment is the same as that in Embodiment 1.
[0049] Example 3
[0050] A masterbatch with super thermal conductivity and anti-scaling function is prepared from the following raw materials:
[0051]
[0052] The preparation method of the masterbatch with super thermal conductivity and anti-scaling function in this embodiment is the same as that in Example 1.
[0053] A super thermal conductive and anti-scaling PE-RT floor heating pipe is prepared from the following raw materials: heat-resistant polyethylene and a masterbatch with super thermal conductive and anti-scaling function whose mass is 4% of the heat-resistant polyethylene.
[0054] The superconducting anti-scaling PE-RT floor heating pipe in this embodiment is the same as that in Embodiment 1.
[0055] Comparative Example 1
[0056] A masterbatch with super thermal conductivity and anti-scaling function is prepared from the following raw materials:
[0057]
[0058] The preparation method of the masterbatch with super thermal conductivity and anti-scaling function in this comparative example is the same as that in Example 1.
[0059] The formula and preparation method of the superconducting anti-scaling PE-RT floor heating pipe in this comparative example are the same as those in Example 1.
[0060] Comparative Example 2
[0061] A masterbatch prepared from the following raw materials:
[0062]
[0063]
[0064] The preparation method of the masterbatch in this comparative example is the same as that in Example 1, and the formula and preparation method of the floor heating pipe in this comparative example are the same as those in Example 1.
[0065] The superconducting anti-scaling PE-RT floor heating pipes prepared in Examples 1-3 and Comparative Example 1 and the ordinary floor heating pipes prepared in Comparative Example 2 were tested to test the static contact angle, thermal conductivity and roughness of the inner wall of the pipes. The results are shown in the following table:
[0066]
[0067] It can be seen from the above table that although the static contact angle and thermal conductivity of the inner wall of the test pipe can be increased to a certain extent by adding dispersants, and the anti-fouling performance and thermal conductivity of the floor heating pipe can be improved, the anti-fouling and thermal conductivity requirements of the pipe cannot be met. By modifying boron nitride and aluminum oxide with silane coupling agents, a bridge is established through the silane coupling agent, which greatly improves the thermal conductivity and anti-fouling performance of the floor heating pipe, thereby achieving good anti-fouling and thermal conductivity effects.
Claims
1. A masterbatch with super thermal conductivity and anti-scaling function, characterized in that Prepared from the following raw materials:
2. The masterbatch with superconducting heat and anti-scaling function according to claim 1, characterized in that The preparation method of the fluorinated polyacrylate is as follows: Under nitrogen protection, deionized water, emulsifier and 1 / 3-1 / 2 of the total mass of potassium persulfate solution were added to the reaction bottle, heated to 50-70°C, dodecafluoroheptyl methacrylate, methyl methacrylate and the remaining potassium persulfate solution were added dropwise, and after the addition was completed, the reaction was continued at 50-70°C for 3-5h, the unreacted monomers were removed under reduced pressure, and the mixture was filtered to obtain fluoropolyacrylate.
3. The masterbatch with superconducting heat and anti-scaling function according to claim 2, characterized in that: The emulsifier is a mixture of sodium perfluorononenyloxybenzene sulfonate and fatty alcohol polyoxyethylene ether, and the mass ratio of sodium perfluorononenyloxybenzene sulfonate to fatty alcohol polyoxyethylene ether is 1:1-2.
4. The masterbatch with super thermal conductivity and anti-scaling function according to claim 1, characterized in that: The pigment is one of pigment yellow 191, titanium dioxide and pigment red 104.
5. The masterbatch with super thermal conductivity and anti-scaling function according to claim 1, characterized in that: The antioxidant is a combination of antioxidant 1010 and antioxidant 168.
6. The masterbatch with super thermal conductivity and anti-scaling function according to claim 1, characterized in that: The modified boron nitride is obtained by modifying boron nitride with a silane coupling agent, and the modified aluminum oxide is obtained by modifying aluminum oxide with a silane coupling agent.
7. A method for preparing a masterbatch with superconducting heat and anti-scaling function as claimed in claim 1, characterized in that The steps include: 7.
1. Evenly mix the heat-resistant polyethylene, pigment, modified boron nitride, modified aluminum oxide, antioxidant and fluorinated polyacrylate to obtain a mixed material; 7.
2. Add the mixed ingredients into a twin-screw extruder, extrude and granulate to obtain the masterbatch with super thermal conductivity and anti-scaling function.
8. A super-conductive anti-scaling PE-RT floor heating pipe, characterized in that The invention is prepared from the following raw materials: heat-resistant polyethylene and the masterbatch with superheat-conducting and anti-scaling function as claimed in claim 1, the mass of which is 1-4% of the heat-resistant polyethylene.
9. A method for preparing the superconducting anti-scaling PE-RT floor heating pipe according to claim 8, characterized in that The steps include: 9.
1. Evenly mix the heat-resistant polyethylene and the masterbatch with super-thermal conductivity and anti-scaling function as claimed in claim 1; 9.
2. Add the mixed material in step 9.1 into a twin-screw extruder, extrude and shape it, and cool it to obtain the superconducting anti-scaling PE-RT floor heating pipe.