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CN-119261303-B - High-heat-conductivity PERT floor heating pipe and preparation method thereof

CN119261303BCN 119261303 BCN119261303 BCN 119261303BCN-119261303-B

Abstract

The invention provides a high-heat-conductivity PERT floor heating pipe and a preparation method thereof, and belongs to the technical field of floor heating pipes. The PERT floor heating pipe comprises a heat conducting outer layer and an anti-pollution inner layer, wherein the heat conducting outer layer comprises, by weight, 200-500 parts of PERT resin, 5-15 parts of heat conducting composite filler, 1-5 parts of plasticizer, 0.5-3.5 parts of antioxidant and 2-5 parts of compatilizer, the heat conducting composite filler is prepared from graphite nano-sheets and surface-treated aluminum nitride, and the anti-pollution inner layer comprises, by weight, 100-200 parts of PERT resin, 3-8 parts of anti-pollution auxiliary agent, 1-2 parts of plasticizer, 0.5-1.5 parts of antioxidant and 1-2 parts of compatilizer, and the anti-pollution auxiliary agent is prepared by modifying and halogenating carbon nano-tubes. The PERT floor heating pipe prepared by the invention not only has excellent heat conduction performance and mechanical property, but also has antibacterial and antiscaling properties, and can keep good performance in the long-term use process.

Inventors

  • GAO YUBO
  • XU RUI
  • YANG ZUYING
  • MA WEIHUA
  • LU YUNLIANG

Assignees

  • 瑞腾建材集团股份有限公司

Dates

Publication Date
20260512
Application Date
20240902

Claims (6)

  1. 1. The high-heat-conductivity PERT floor heating pipe is characterized by comprising a heat-conducting outer layer and an anti-fouling inner layer, wherein the heat-conducting outer layer comprises, by weight, 200-500 parts of PERT resin, 5-15 parts of heat-conducting composite filler, 1-5 parts of plasticizer, 0.5-3.5 parts of antioxidant and 2-5 parts of compatilizer; The preparation method of the heat-conducting composite filler comprises the following steps: Adding 0.1-0.5 part of 3- (2, 3-glycidoxy) propyl trimethoxy silane, 0.1-0.5 part of 3-diethylenetriamine propyl methyl dimethoxy silane, 1-3 parts of ammonium stearate and 3-6 parts of acetic acid into methanol and water to be uniformly mixed, then adding 10-30 parts of aluminum nitride, heating and stirring, centrifuging, washing and drying to obtain surface treated aluminum nitride, adding 15-20 parts of graphite nano-sheets and 5-10 parts of surface treated aluminum nitride into N, N-dimethylformamide to be uniformly mixed, heating and stirring, centrifuging, washing and drying, and calcining under the protection of nitrogen to obtain a heat-conducting composite filler, wherein the aluminum nitride consists of aluminum nitride with the granularity of 2-10 mu m and aluminum nitride with the granularity of 40-50 mu m according to the weight ratio of 1:1-2; the anti-fouling inner layer comprises the following raw materials, by weight, 100-200 parts of PERT resin, 3-8 parts of anti-fouling auxiliary agent, 1-2 parts of plasticizer, 0.5-1.5 parts of antioxidant and 1-2 parts of compatilizer; The preparation method of the anti-fouling additive comprises the following steps: adding 1-5 parts of carbon nano tube into N, N-dimethylformamide, uniformly mixing, adding 10-15 parts of vinyltriethoxysilane, heating, stirring, centrifuging, washing and drying to obtain the vinyl carbon nano tube, adding 0.2-0.5 part of sodium dodecyl benzene sulfonate and 1-2 parts of vinyl carbon nano tube into water, uniformly mixing, adding 0.5-1.5 part of 4-vinylpiperidine hydrochloride, 1-1.5 parts of butyl methacrylate and 0.1-0.3 part of azodiisobutyronitrile, heating under the protection of nitrogen, centrifuging, washing and drying to obtain the piperidine modified carbon nano tube, adding 0.5-2 parts of piperidine modified carbon nano tube and 0.5-2 parts of sodium hypochlorite into water, uniformly mixing, stirring at room temperature, centrifuging, washing and drying to obtain the anti-pollution auxiliary agent.
  2. 2. The high thermal conductivity PERT floor heating pipe of claim 1, wherein the carbon nanotubes are hydroxylated multiwall carbon nanotubes.
  3. 3. The high thermal conductivity PERT floor heating pipe as set forth in claim 1, wherein the plasticizer is one or more of polyethylene wax, chlorinated paraffin, dioctyl phthalate, acetyl tributyl citrate, and di (2-ethylhexyl) adipate.
  4. 4. The high thermal conductivity PERT floor heating pipe of claim 1, wherein the antioxidant is one or a mixture of more than two of antioxidant DSTP, antioxidant 1076, antioxidant 1010, antioxidant 1098 and antioxidant 636.
  5. 5. The high thermal conductivity PERT floor heating pipe of claim 1, wherein the compatilizer is one or a mixture of more than two of polyethylene grafted maleic anhydride, polypropylene grafted maleic anhydride and polyolefin elastomer grafted maleic anhydride.
  6. 6. The method for preparing the high heat conduction PERT floor heating pipe according to any one of claims 1 to 5, comprising the following steps: And respectively mixing the raw materials in the heat-conducting outer layer and the anti-pollution inner layer according to a raw material formula to obtain a heat-conducting outer layer mixed material and an anti-pollution inner layer mixed material, extruding the heat-conducting outer layer mixed material and the anti-pollution inner layer mixed material in two layers, sizing, forming, and traction cutting to obtain the high heat-conducting PERT floor heating pipe.

Description

High-heat-conductivity PERT floor heating pipe and preparation method thereof Technical Field The invention belongs to the technical field of floor heating pipes, and particularly relates to a high-heat-conductivity PERT floor heating pipe and a preparation method thereof. Background Many urban winter cold climates often require home heating to maintain comfortable indoor temperatures. Domestic heating is often used for floor heating, namely floor radiant heating, by burying a hot water pipe or a heating cable under the floor so as to heat the whole floor and uniformly transfer heat into a room in a radiation heat dissipation mode. As a common heating mode, floor heating is widely applied to novel buildings. Conventionally, a PERT resin is generally used for a floor heating pipe, and the heat-resistant polyethylene resin has good toughness, low-temperature impact resistance and water pressure resistance, and is suitable to be used as a main material in a heating system. But the heat conduction capability of the PERT resin is relatively low (compared with a metal pipe), the heat conduction capability of the resin can be further influenced by friction or electrostatic action, in addition, dirt is easy to generate in the long-term use process under the influence of oxygen and bacteria in water, and the heat dissipation efficiency and the service life of the floor heating pipe and the sanitation condition of indoor environment are seriously influenced. In order to solve the above problems, the prior art can improve the hydrophobicity of the inner wall of the pipe by adding an anti-fouling or heat-conducting filler, such as silane-based materials, into the PERT resin, prevent impurities and bacteria in water from adhering to the inner wall of the pipe, and reduce the adhesion and deposition of dirt. The heat conducting agent can increase the heat conducting performance of the pipeline, accelerate heat conduction to improve the heating efficiency of the floor, and make heating more uniform. Chinese patent CN106589547a discloses a pipe for floor heating, and a preparation method and application thereof, wherein the pipe uses II-type heat-resistant polyethylene or I-type heat-resistant polyethylene as a main material, and the heat conductivity and heat conductivity of the pipe are improved by adding fillers such as graphite and carbon fiber, so that the expansion coefficient and shrinkage rate of the pipe are reduced, and the pipe can be widely used for floor heating. However, these fillers tend to have poor compatibility with the host material PERT resin, adversely affecting the overall performance and stability of the floor heating pipe. Therefore, the invention aims to prepare the novel high-heat-conductivity PERT floor heating pipe so as to solve the problems of pollution resistance and insufficient heat conductivity in the prior art, thereby providing a more efficient heating experience, maintaining good performance and reliability in the long-term use process and further meeting the requirements of people on comfortable indoor environments. Disclosure of Invention In view of the defects existing in the prior art, the invention provides the high heat conduction PERT floor heating pipe, which comprises a heat conduction outer layer and an anti-fouling inner layer, wherein a heat conduction composite filler prepared from graphite nano sheets and surface treated aluminum nitride is added into a heat conduction outer layer raw material, and an anti-fouling auxiliary agent prepared from carbon nano tubes through modification and halogenation is added into an anti-fouling inner layer raw material, so that the PERT floor heating pipe is ensured to have excellent heat conduction performance and mechanical performance, and meanwhile, the high heat conduction performance, the anti-fouling performance and the good performance can be maintained in a long-term use process. The invention also provides a preparation method of the high-heat-conductivity PERT floor heating pipe. A high heat conduction PERT floor heating pipe comprises a heat conduction outer layer and an anti-pollution inner layer; Preferably, the heat-conducting outer layer comprises the following raw materials, by weight, 200-500 parts of PERT resin, 5-15 parts of heat-conducting composite filler, 1-5 parts of plasticizer, 0.5-3.5 parts of antioxidant and 2-5 parts of compatilizer. Preferably, the anti-fouling inner layer comprises the following raw materials, by weight, 100-200 parts of PERT resin, 3-8 parts of anti-fouling auxiliary agent, 1-2 parts of plasticizer, 0.5-1.5 parts of antioxidant and 1-2 parts of compatilizer. Preferably, the thickness of the heat conducting outer layer is 1-3mm, and the thickness of the anti-fouling inner layer is 0.5-2mm. Preferably, the plasticizer is one or more than two of polyethylene wax, chlorinated paraffin, dioctyl phthalate, acetyl tributyl citrate and adipic acid di (2-ethylhexyl) ester. Preferably, the antioxidan