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CN-121975239-A - EPDM flame-retardant water pipe material for charging pile and preparation method and application thereof

CN121975239ACN 121975239 ACN121975239 ACN 121975239ACN-121975239-A

Abstract

The application relates to the technical field of flame-retardant water pipe materials, and particularly discloses an EPDM flame-retardant water pipe material for a charging pile, and a preparation method and application thereof. The application discloses an EPDM flame-retardant water pipe material for a charging pile, which comprises 100 parts of EPDM raw rubber, 40-70 parts of quick-extrusion carbon black N550, 90-140 parts of flame retardant, 3-5 parts of silane coupling agent A-172, 20-40 parts of paraffin oil, 4-8 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 7-10 parts of peroxide and 1-3 parts of auxiliary crosslinking agent, wherein the flame retardant consists of phosphorus-nitrogen flame retardant and aluminum hydroxide. The flame-retardant water pipe material provided by the application has the excellent performances of wide temperature range stability, mechanical-flame-retardant synergy and sealing damage resistance through optimizing the formula composition.

Inventors

  • CHEN QIAONA
  • MA MINGHUI
  • SHI NAN
  • ZHANG RUNPU
  • WANG NING

Assignees

  • 天津中和胶业股份有限公司

Dates

Publication Date
20260505
Application Date
20260311

Claims (10)

  1. 1. 100 Parts of EPDM raw rubber, 40-70 parts of quick-extrusion carbon black N550, 90-140 parts of flame retardant, 3-5 parts of silane coupling agent A-172, 20-40 parts of paraffin oil, 4-8 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 7-10 parts of peroxide and 1-3 parts of auxiliary crosslinking agent; the flame retardant is composed of phosphorus-nitrogen flame retardants and aluminum hydroxide in a weight ratio of 4-6:5-8.
  2. 2. The EPDM flame-retardant water pipe material for the charging pile according to claim 1 is characterized by comprising, by weight, 100 parts of EPDM raw rubber, 50-60 parts of quick-extrusion carbon black N550, 100-130 parts of flame retardant, 3.5-4.5 parts of silane coupling agent A-172, 25-35 parts of paraffin oil, 5-7 parts of magnesium oxide, 0.7-1.2 parts of stearic acid, 8-9 parts of peroxide and 1.5-2.5 parts of auxiliary crosslinking agent.
  3. 3. The EPDM flame retardant water pipe material for a charging pile according to claim 1, wherein the EPDM raw rubber is formed by mixing EPDM 8550C, EPDM and C, EPDM 2650C in a weight ratio of 1-1.5:1-1.5.
  4. 4. The EPDM flame-retardant water pipe material for the charging pile according to claim 1, wherein the flame retardant comprises a phosphorus-nitrogen flame retardant and aluminum hydroxide in a weight ratio of 4.5-5.5:6-7.
  5. 5. The EPDM flame retardant water pipe material for a charging pile of claim 1, wherein the phosphorus-nitrogen flame retardant is nitrogen-phosphorus agent YL-101.
  6. 6. The EPDM flame retardant water pipe material for a charging pile according to claim 1, wherein the peroxide is BIPB-40, and the auxiliary cross-linking agent is TMPTMA.
  7. 7.A method for preparing the EPDM flame-retardant water pipe material for charging piles according to any one of claims 1 to 6, which is characterized by comprising the following steps in sequence: (1) Uniformly mixing all the flame retardant, all the paraffin oil and one-fourth to three-fourth of the silane coupling agent A-172 to form primary mixed slurry, and homogenizing to obtain a flame retardant pre-dispersion; (2) Adding EPDM raw rubber, magnesium oxide and stearic acid into an internal mixer according to the formula proportion, controlling the temperature to be 60-80 ℃, banburying for 20-40 s, and lifting a top bolt; (3) Adding fast extrusion carbon black N550, a flame retardant pre-dispersion and the balance of silane coupling agent into an internal mixer, mixing to 100-110 ℃, lifting the mixture for 1-2 times, and fully and uniformly mixing the materials; (4) Adding peroxide and auxiliary crosslinking agent into an internal mixer, mixing to 115-120 ℃ and discharging; (5) Cooling by thin pass on an open mill, and then sending to a filter for filtering; (6) And cooling the sizing material to 15-25 ℃ for packaging.
  8. 8. The preparation method of the EPDM flame-retardant water pipe material for the charging pile, as claimed in claim 7, is characterized in that the technological parameters of the step (1) are that the whole amount of flame retardant, the whole amount of paraffin oil and one half to two thirds of silane coupling agent A-172 are put into a stirring kettle with the temperature of 30-40 ℃ and the rotating speed of 50-100 r/min, stirred and mixed uniformly to form primarily mixed slurry, and then the primarily mixed slurry is transferred into a homogenizer for homogenization treatment to obtain the flame retardant pre-dispersion.
  9. 9. The preparation method of the EPDM flame-retardant water pipe material for the charging pile, which is disclosed in claim 7, is characterized in that the technological parameters of the homogenizing treatment are that the homogenization is firstly carried out for 5-20 min under the conditions of 30-40 ℃ and 30-50 MPa of working pressure, and then the homogenization is carried out for 20-50 min under the conditions of 50-60 ℃ and 80-100 MPa of working pressure.
  10. 10. Use of the EPDM flame-retardant water pipe material for charging piles according to any one of claims 1 to 6 in flame-retardant materials.

Description

EPDM flame-retardant water pipe material for charging pile and preparation method and application thereof Technical Field The application relates to the technical field of flame-retardant water pipe materials, in particular to an EPDM flame-retardant water pipe material for a charging pile, and a preparation method and application thereof. Background The cooling water pipe is used as a key component of the liquid cooling system and needs to have the characteristics of flame retardance and the like (for example, when the cooling water pipe is in high-power quick charge, if the cooling water pipe is inflammable, the condition of high temperature or circuit fault and the like can promote fire, and the safety of equipment and personnel is threatened). The cooling water pipe needs to maintain good rebound resilience and strength while ensuring flame retardance, does not influence the service performance of the cooling water pipe in a liquid cooling system such as pressure bearing, bending/sealing and the like, ensures the stable operation of the cooling circulating system, and cannot cause faults such as cracking, leakage and the like due to poor mechanical properties of the water pipe. The liquid cooling system circulates the cooling liquid in the fast filling process, the pipeline can contact with the high temperature of 50-80 ℃, and in cold areas or winter, the environment temperature can be as low as-30 ℃ or even lower, the pipeline needs to keep stable performance in a larger temperature range, and the pipeline cannot be alternately embrittled or softened due to cold and heat. The existing material is difficult to simultaneously meet various performance indexes such as flame retardance, rebound, strength and the like and stability requirements under a wider temperature environment, so that the development of the flame-retardant water pipe material with excellent comprehensive performance has important significance. Disclosure of Invention In order to solve the technical problems, the application provides an EPDM flame-retardant water pipe material for a charging pile, and a preparation method and application thereof. The application provides an EPDM flame-retardant water pipe material for a charging pile, which comprises, by weight, 80-120 parts of EPDM raw rubber, 40-70 parts of quick-extrusion carbon black N550, 90-140 parts of flame retardant, 3-5 parts of silane coupling agent A-172, 20-40 parts of paraffin oil, 4-8 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 7-10 parts of peroxide and 1-3 parts of auxiliary crosslinking agent; the flame retardant is composed of phosphorus-nitrogen flame retardants and aluminum hydroxide in a weight ratio of 4-6:5-8. The design principle of the technical scheme provided by the application is specifically as follows: When meeting the use requirement of the charging pile liquid-cooled pipeline in a wide temperature range, the low-temperature performance optimization of the EPDM is critical because the EPDM is better in high-temperature resistance and aging resistance, and particularly the performance below 100 ℃. By adopting EPDM mark with low ethylene content and utilizing the molecular chain structure characteristic, the flexibility and embrittlement resistance of the material in low-temperature environment are effectively improved. Specifically, the low ethylene content enables the propylene unit ratio in the EPDM molecular chain to be relatively increased, reduces the crystallization tendency and the crystallization degree of the molecular chain, and reduces the ordered arrangement and the hardening phenomenon of the molecular chain at low temperature. Meanwhile, the lower ethylene content is beneficial to weakening cohesive force among molecular chains, so that the molecular chains can still keep a relatively free motion state at low temperature, thereby obviously improving the glass transition temperature (Tg) and low-temperature elasticity of the material, ensuring that a liquid cooling pipeline can still maintain good flexibility and shock resistance in an extremely low-temperature environment of-40 ℃ or below, avoiding pipeline rupture risk caused by low-temperature embrittlement, and ensuring stable transmission of cooling liquid. The fast extrusion carbon black N550 is selected as a key reinforcing agent, so that the mechanical property and extrusion molding are ensured. The fast extrusion carbon black N550 has moderate structural property and proper particle size, and the unique aggregate form can form a uniformly dispersed three-dimensional network structure in the EPDM rubber matrix. In the mixing process, rich active sites on the surface of the carbon black and a rubber molecular chain generate strong physical adsorption effect, a filler-rubber reinforcing network is constructed, the tensile strength, the tearing strength and the fatigue resistance of the material are obviously improved, and the external force impact of the liquid cooling pipel