CN-121159968-B - Special material for heat-conducting pressure-resistant polyolefin pipe and preparation method thereof

CN121159968BCN 121159968 BCN121159968 BCN 121159968BCN-121159968-B

Abstract

The application relates to a special material for a heat-conducting pressure-resistant polyolefin pipe and a preparation method thereof, wherein the special material for the heat-conducting pressure-resistant polyolefin pipe comprises a polyethylene resin blending matrix, a pretreatment filler, maleic anhydride grafted polyethylene, polyvinyl chloride/polyethyl methacrylate (PVC/PEMA) polymer, carbon fiber and a stabilizer; the preparation method comprises the steps of adding a polyethylene resin blending matrix, PVC/PEMA polymer, maleic anhydride grafted polyethylene, a pretreatment filler, carbon fiber, an antioxidant and zinc stearate into a high-speed mixer for mixing, blending with vinyl trimethoxy silane and dicumyl peroxide at 195 ℃ and 280 revolutions per minute (rpm) through a double-screw extruder, and granulating to obtain the heat-conducting pressure-resistant polyolefin pipe special material.

Inventors

ZHAO SONGMEI
ZHAI CONGCONG
LIU WEILI
YU YUAN
WEI WANSHUN

Assignees

北京市科学技术研究院

Dates

Publication Date: 20260505
Application Date: 20251011

Claims (3)

1. The special material for the heat-conducting pressure-resistant polyolefin pipe is characterized by comprising, by weight, 94-110 parts of a polyethylene resin blending matrix, 24.3-26.4 parts of a pretreatment filler, 6-9.2 parts of maleic anhydride grafted polyethylene, 12-16 parts of a PVC/PEMA polymer, 10-13 parts of carbon fibers and 1.8-3 parts of a stabilizer; The pretreatment filler comprises graphene oxide and modified silicon dioxide, and comprises, by weight, 0.6-1 part of graphene oxide and 23.7-25.4 parts of modified silicon dioxide; The preparation method of the polyethylene resin blending matrix comprises the steps of mixing 15-20 parts of linear low-density polyethylene, 30-42 parts of low-density high-pressure polyethylene and 5-15 parts of polystyrene resin in parts by weight at 50 ℃ for 260 rmp minutes to obtain the polyethylene resin blending matrix; The stabilizer comprises, by weight, 1.4-1.8 parts of vinyl trimethoxy silane, 0.15-0.4 part of dicumyl peroxide, 0.16-0.4 part of an antioxidant and 0.1-0.4 part of zinc stearate; The antioxidant comprises an antioxidant 1010 and an antioxidant 168 in a weight ratio of 1:1; The preparation method of the pretreatment filler comprises the steps of mixing graphene oxide and silicon dioxide, spraying an ethanol solution containing a silane coupling agent KH-550, stirring at 80 ℃ and 600 rpm, and vacuum drying at 120 ℃ for 4 hours; The preparation method of the PVC/PEMA polymer comprises the steps of dissolving polyvinyl chloride and polyethyl methacrylate in N, N-Dimethylformamide (DMF) solvent, stirring, adding zinc triflate salt, stirring at room temperature, adding ionic liquid EMIMTFSI, stirring to obtain a mixture, dispersing nano titanium dioxide in DMF, carrying out ultrasonic treatment to obtain filler dispersion liquid, adding the filler dispersion liquid into the mixture, stirring, and carrying out vacuum drying to obtain the PVC/PEMA polymer.
2. The method for preparing the heat-conducting pressure-resistant polyolefin pipe special material according to claim 1, which is characterized in that the preparation method comprises the steps of adding a polyethylene resin blending matrix, PVC/PEMA polymer, maleic anhydride grafted polyethylene, pretreatment filler, carbon fiber, antioxidant and zinc stearate into a high-speed mixer for mixing, blending the materials with vinyltrimethoxysilane and dicumyl peroxide at 195 ℃ and 280rpm through a double-screw extruder, and granulating to obtain the heat-conducting pressure-resistant polyolefin pipe special material.
3. The preparation method of claim 2, wherein the special material for the heat-conducting pressure-resistant polyolefin pipe is obtained by mixing for 8-10 minutes under the mixing condition of 1200 rpm and performing vacuum granulation at-0.08 and MPa.

Description

Special material for heat-conducting pressure-resistant polyolefin pipe and preparation method thereof Technical Field The application relates to the technical field of high molecular compounds, in particular to a heat-conducting pressure-resistant polyolefin pipe special material and a preparation method thereof. Background In the fields of energy transportation, floor heating and industrial heat exchange pipelines, polyolefin pipes with high heat conduction and long-term pressure stability are needed in the market. The prior art has mainly improved thermal conductivity by filling metal, ceramic or carbon materials, or strength by means of fiber reinforcement and crosslinking reactions. However, these methods still have problems in that, although the high amount of inorganic particles filled can increase the thermal conductivity, poor compatibility with polyolefin leads to weak interface bonding, stress concentration and permeation channels, while reducing toughness, increasing the risk of brittle fracture, and affecting the processing flowability. Although the strength can be improved by adopting short fiber reinforcement or chemical crosslinking, uneven heat conduction, reduced long-term fatigue resistance and microscopic defects caused by crosslinking side reaction are brought, and the service life of the material is influenced. The prior art fails to address interactions between the filler, reinforcement and matrix reactions. Under the actual high-temperature and high-pressure working conditions, the thermal expansion difference of different materials causes interface stress accumulation, the traditional mechanical mixing is difficult to solve the stress, and the internal stress is aggravated by the crosslinked structure. In long-term use, moisture or chemical medium permeates along interface defects to cause hydrolysis and corrosion, so that thermal-chemical coupling destruction circulation is formed, and finally filler is dropped and microcrack is expanded, so that the pipe is prematurely failed. These problems are highly concealed and difficult to find by short-term testing, which constitutes a serious threat to the long-term security of the system. In view of the above, there is a need to develop a new material for heat-conducting and pressure-resistant polyolefin pipes and a preparation method thereof. Disclosure of Invention The application provides a special material for a heat-conducting pressure-resistant polyolefin pipe and a preparation method thereof, which are used for solving the problems in the background technology. In order to solve the technical problems, the application discloses a special material for a heat-conducting pressure-resistant polyolefin pipe, which comprises a polyethylene resin blending matrix, a pretreatment filler, maleic anhydride grafted polyethylene, a PVC/PEMA polymer, carbon fibers and a stabilizer. Further, the modified polyethylene resin comprises 94-110 parts by weight of a polyethylene resin blending matrix, 24.3-26.4 parts by weight of a pretreatment filler, 6-9.2 parts by weight of maleic anhydride grafted polyethylene, 12-16 parts by weight of PVC/PEMA polymer, 10-13 parts by weight of carbon fiber and 1.8-3 parts by weight of stabilizer. Further, the pretreatment filler comprises graphene oxide and modified silicon dioxide, and comprises, by weight, 0.6-1 part of graphene oxide and 23.7-25.4 parts of modified silicon dioxide. Further, the preparation method of the polyethylene resin blending matrix comprises the steps of mixing 15-20 parts of linear low-density polyethylene, 30-42 parts of low-density high-pressure polyethylene and 5-15 parts of polystyrene resin at 260 revolutions per minute for a period of time at 50 ℃ according to parts by weight to obtain the polyethylene resin blending matrix. Further, the stabilizers include vinyltrimethoxysilane, dicumyl peroxide, antioxidants, and zinc stearate. Further, the stabilizer comprises, by weight, 1.4-1.8 parts of vinyl trimethoxy silane, 0.15-0.4 part of dicumyl peroxide, 0.16-0.4 part of an antioxidant and 0.1-0.4 part of zinc stearate. Further, the antioxidant comprises an antioxidant 1010 and an antioxidant 168 in a weight ratio of 1:1. Further, the preparation method of the pretreatment filler comprises the steps of mixing graphene oxide and modified silicon dioxide, spraying an ethanol solution containing a silane coupling agent KH-550, stirring at 80 ℃ and 600 rpm, and vacuum drying at 120 ℃ for 4 hours. Further, the preparation method of the PVC/PEMA polymer comprises the steps of dissolving polyvinyl chloride and polyethyl methacrylate in an N, N-dimethylformamide solvent, stirring, adding zinc triflate salt, stirring at room temperature, adding ionic liquid EMIMTFSI, stirring to obtain a mixture, and carrying out nano-scale preparationDispersing in DMF, ultrasonic treating to obtain filler dispersion, adding the filler dispersion into the mixture, stirring, and vacuum drying to obtain PVC/PEMA