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High-thermal-conductivity radiation crosslinked polyethylene pipe, and preparation method and application thereof

A radiation cross-linked polyethylene pipe technology is applied in the field of high thermal conductivity radiation cross-linked polyethylene pipes and their preparation, which can solve the problems of low hydraulic resistance, increased brittleness of pipes, easy occurrence of brittle cracks, etc. Wide service temperature, the effect of improving brittleness

Active Publication Date: 2020-04-03
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention uses a large amount of graphite for filling modification, which will increase the brittleness of the pipe, and does not add other modification additives to improve its impact resistance and environmental stress cracking resistance, and it is prone to brittle cracking at low temperatures
[0006] It can be seen from the above that the heat-conducting polyethylene pipes produced by the existing technology have problems such as poor acid corrosion resistance, low hydraulic pressure resistance, and low temperature brittleness, and are not suitable for transporting acidic fluids under pressure under wide operating temperatures, etc. harsh application scenarios

Method used

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  • High-thermal-conductivity radiation crosslinked polyethylene pipe, and preparation method and application thereof
  • High-thermal-conductivity radiation crosslinked polyethylene pipe, and preparation method and application thereof
  • High-thermal-conductivity radiation crosslinked polyethylene pipe, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A high thermal conductivity radiation cross-linked polyethylene pipe is prepared by the following method (such as figure 1 shown):

[0049] 1) Preparation of modified masterbatch (such as figure 2 shown):

[0050] Surface activation: first add 48 parts of 25 μm expandable graphite and 2 parts of 5 μm boron nitride into the high-speed mixer, and stir for 5 minutes at 60-70 ° C; then take 1.5 parts of silane coupling agent KH-550 through 3 parts of industrial white Add the oil to the powder after dilution, and continue to stir for 8 minutes;

[0051] Mixing and granulation: 50 parts of high-density polyethylene 5502, 15 parts of thermoplastic elastomer (10 parts of ethylene-vinyl acetate copolymer and 5 parts of ethylene-propylene copolymer), 2 parts of cross-linking sensitizer diethylene glycol Alcohol diacrylate and 0.5 part of antioxidant (0.3 part of 1010 and 0.2 part of 168) were added to the surface-activated powder, and stirred at high speed for 12 minutes. Th...

Embodiment 2

[0061] A high thermal conductivity radiation cross-linked polyethylene pipe is prepared by the following method:

[0062] 1) Preparation of modified masterbatch:

[0063] Surface activation: first add 16 parts of 45μm natural graphite and 4 parts of 20μm boron nitride into the high-speed mixer, stir at 55-65°C for 3 minutes; then take 1 part of titanate coupling agent TTS and wash it with 3 parts of absolute ethanol After dilution, add to the powder and continue to stir for 7 minutes;

[0064] Mixing and granulation: 20 parts of medium density polyethylene DX800, 5 parts of thermoplastic elastomer (2 parts of ethylene-vinyl acetate copolymer and 3 parts of ethylene-octene copolymer), 2.5 parts of cross-linking sensitizer trimethylol Propane trimethacrylate and 0.5 part of antioxidant (0.3 part of 1010 and 0.2 part of 1178) were added to the surface-activated powder, and stirred at high speed for 10 minutes. The rest are the same as embodiment 1.

[0065] 2) Extrusion of hea...

Embodiment 3

[0070] A high thermal conductivity radiation cross-linked polyethylene pipe is prepared by the following method:

[0071] 1) Preparation of modified masterbatch:

[0072] Surface activation: first add 100 parts of 15 μm colloidal graphite and 25 parts of 2 μm boron nitride into a high-speed mixer, and stir for 5 minutes at 70-80°C; then take 5 parts of aluminum-titanium composite coupling agent HY-133 and pass through 10 parts of industrial Add white oil to the powder after dilution, and continue to stir for 10 minutes;

[0073] Mixing and granulation: 40 parts of medium density polyethylene SP980, 45 parts of thermoplastic elastomer (35 parts of ethylene-vinyl acetate copolymer and 10 parts of ethylene-butylene copolymer), 3 parts of cross-linking sensitizer trimethylol Propane triacrylate and 1 part of antioxidant (0.7 part of 754 and 0.3 part of 168) were added to the surface-activated powder, and stirred at high speed for 15 minutes. The rest are the same as embodiment 1...

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Abstract

The invention provides a high-thermal-conductivity radiation crosslinked polyethylene pipe, and a preparation method and an application thereof, and relates to the technical field of high polymer materials. The high-thermal-conductivity radiation crosslinked polyethylene pipe is prepared from, by weight, 100 parts of polyethylene, 5-180 parts of graphite, 0.1-40 parts of boron nitride, 5-90 partsof a thermoplastic elastomer and 0.2-108 parts of additives; and the additives comprise, by weight, 0.05-9 parts of a coupling agent, 0.05-90 parts of a diluent, 0-6 parts of a cross-linking sensitizer and 0.1-3 parts of an antioxidant. The crosslinked polyethylene pipe prepared by the method through the process steps of activation granulation, pipe extrusion, radiation crosslinking and the like has the characteristics of high thermal conductivity, hydraulic pressure resistance, acid corrosion resistance, wide use temperature range and the like, and can be applied to building floor heating systems, ground source heat pump systems, chemical shell-and-tube heat exchangers and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high thermal conductivity radiation cross-linked polyethylene pipe and its preparation method and application. Background technique [0002] Polyethylene is a recyclable, non-toxic and odorless non-polar thermoplastic resin. The pipes made of it have outstanding advantages such as hydraulic resistance, corrosion resistance, safety and sanitation, and are widely used in civil water heating and industrial water supply heat exchange. field. However, the thermal conductivity of polyethylene is only 0.44W / (m·K), which is less than one percent of that of steel, which severely limits the heat transfer efficiency of pipes and makes it difficult to achieve efficient utilization of thermal energy resources. Therefore, the manufacture of high thermal conductivity polyethylene pipes has become one of the research hotspots that engineers and technicians pay attention to. [0003...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/16C08L23/08C08K3/04C08K3/38C08K7/24C08K9/06C08J3/22C08J7/12
CPCC08L23/06C08J3/22C08J7/123C08J2323/06C08J2423/06C08J2423/08C08K2003/385C08L2205/03C08L2203/18C08L2207/062C08L2312/06C08L23/16C08L23/0853C08L23/0815C08K3/04C08K3/38C08K7/24C08K9/06C08K9/04
Inventor 霍伟智孔令光赵照孔德敬王清
Owner FSPG HI TECH
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