Search

CN-121975240-A - Low-dielectric high-heat-resistance motor outgoing line insulating material and preparation method thereof

CN121975240ACN 121975240 ACN121975240 ACN 121975240ACN-121975240-A

Abstract

The application discloses a low-dielectric high-heat-resistance motor outgoing line insulating material and a preparation method thereof, and belongs to the technical field of high-polymer insulating materials. The insulating material consists of A, B components, wherein the component A comprises boric acid end capped EPDM, polyolefin elastomer, polypropylene, N- (3, 4-dihydroxyphenethyl) -2-naphthalimide and antioxidant, and the component B comprises LLDPE, polypropylene, catalyst and antioxidant. The preparation method comprises the steps of respectively preparing A, B components, and mixing the components in proportion. According to the application, a dynamic borate crosslinked network is formed between the boric acid end-capped EPDM and the dopamine derivative, so that the final product has excellent low dielectric constant, low dielectric loss, high heat resistance, high insulating strength and unique self-repairing capability, the technical problems that the traditional silane crosslinked insulating material is deteriorated in dielectric property and incapable of repairing damage by self due to polar micromolecules are effectively solved, and the novel boric acid end-capped EPDM/dopamine derivative is particularly suitable for high-end outgoing line application scenes such as high-frequency motors, metal-containing shielding layers and the like.

Inventors

  • XIE WEIBIN
  • HU YUNZHOU
  • ZHONG RONG
  • YANG YUCHEN
  • JIANG XINYU

Assignees

  • 杭州以田科技有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The low-dielectric high-heat-resistance motor outgoing line insulating material is characterized by comprising a component A and a component B; the component A comprises the following raw materials, by weight, 15-40 parts of boric acid end-capped EPDM, 25-40 parts of polyolefin elastomer, 25-40 parts of polypropylene, 1.0-2.5 parts of N- (3, 4-dihydroxyphenethyl) -2-naphthamide and 0.5-1.0 part of antioxidant; The component B comprises the following raw materials, by weight, 50-70 parts of LLDPE, 20-30 parts of polypropylene, 0.02-0.06 part of a catalyst and 0.8-1.5 parts of an antioxidant.
  2. 2. The insulation material for the outgoing line of the low-dielectric high-heat-resistance motor, which is disclosed in claim 1, wherein the weight ratio of the component A to the component B is (88-96) (4-12).
  3. 3. The low-dielectric high-heat-resistance motor outgoing line insulating material according to claim 1, wherein the boric acid end-capped EPDM is prepared by a method comprising the steps of dissolving epoxidized EPDM in an organic solvent, reacting with 3-aminophenylboric acid at 60-85 ℃, precipitating, washing and drying after the reaction is finished.
  4. 4. The insulating material for the outgoing line of the low-dielectric high-heat-resistant motor according to claim 1, wherein the N- (3, 4-dihydroxyphenethyl) -2-naphthalimide is prepared by a method comprising the steps of reacting dopamine hydrochloride with 2-naphthalene boric acid in a buffer solution with a pH value of 8.5 at 25 ℃, and acidizing, precipitating, washing and drying after the reaction is finished.
  5. 5. The insulating material for the outgoing line of the low-dielectric high-heat-resistance motor according to claim 1, wherein the component A further comprises a functional filler, wherein the functional filler is at least one of boron nitride nanosheets and nanosilicon dioxide, and the addition amount of the functional filler is 1-8 parts.
  6. 6. The low-dielectric high-heat-resistance motor outgoing line insulating material according to claim 5, wherein the functional filler is boron nitride nano-sheets with the particle size of 30-50nm, and the adding amount is 3-6 parts.
  7. 7. The insulation material for the outgoing line of the low-dielectric high-heat-resistance motor according to claim 1, wherein the component A further comprises 5-10 parts of flame retardant, and the flame retardant is ammonium polyphosphate.
  8. 8. The low-dielectric high-heat-resistance motor outgoing line insulating material according to claim 1, wherein the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite antioxidant 168, and the compound weight ratio is1 (0.5-1.5).
  9. 9. A method for preparing the low dielectric high heat resistance motor lead-out wire insulating material according to any one of claims 1 to 8, comprising the following steps: preparing a component A, namely carrying out melt blending and dynamic crosslinking reaction on the raw materials of the component A through a double-screw extruder, and granulating under water to prepare material A particles; Preparing a component B, namely banburying, melting, extruding and granulating the raw materials of the component B to obtain a material B master batch; And (3) preparing a finished product, namely mixing the material A particles with the material B master batch, and cooling to obtain the insulating material.
  10. 10. A motor lead-out wire, characterized in that the insulating layer is made of the low-dielectric high-heat-resistance motor lead-out wire insulating material according to any one of claims 1-8.

Description

Low-dielectric high-heat-resistance motor outgoing line insulating material and preparation method thereof Technical Field The invention relates to the technical field of high polymer insulating materials, in particular to a special insulating material for a motor outgoing line with low dielectric constant, high heat resistance and self-repairing function and a preparation method thereof. Background The motor outgoing line is a key component for motor power transmission and signal control, and the performance of an insulating material of the motor outgoing line is directly related to the reliability, efficiency and service life of motor operation. With the development of industry, especially the improvement of the fields of new energy automobiles, servo motors and the like, higher requirements are put on motor outgoing lines, namely higher working frequency, higher working environment temperature and more complex electromagnetic shielding structure. At present, most of common insulating materials for motor outgoing lines are common crosslinked polyethylene (XLPE) or silane crosslinked polyethylene. These conventional materials are prone to polar small molecule byproducts such as alcohols during crosslinking, especially in silane crosslinking systems. These residual polar small molecules can cause an increase in the dielectric constant and dielectric loss tangent of the insulating material, causing significant signal attenuation and interference at high speed frequency conversion or high frequency signal transmission, which is particularly problematic in metallic shielded cable structures. In addition, the existing material system has the following limitations that firstly, the heat resistance is insufficient, the long-term use temperature is usually difficult to exceed 125 ℃, the working condition requirement of higher temperature cannot be met, secondly, the dispersion uniformity of each component of the material is difficult to ensure, the consistency of the product performance is influenced, and furthermore, the mechanical strength and the electrical property of the material are often difficult to be compatible. More importantly, once the traditional insulating material generates tiny scratches or defects in the production, installation or use process, the insulating performance of the traditional insulating material can be irreversibly reduced, and finally the insulating material can possibly fail, so that potential safety hazards exist. Therefore, there is an urgent need in the art to develop a new insulating material, which not only has low dielectric constant, high heat resistance and stable electrical insulation properties, but also has certain functional characteristics, such as self-repairing of micro damage, so as to greatly improve the long-term reliability and safety of the motor lead-out wire. Disclosure of Invention In order to solve the defects in the prior art, the application aims to provide a low-dielectric high-heat-resistance motor outgoing line insulating material and a preparation method thereof. In a first aspect, the application provides a low-dielectric high-heat-resistance motor outgoing line insulating material, which adopts the following technical scheme: a low-dielectric high-heat-resistance motor outgoing line insulating material comprises a component A and a component B; the component A comprises the following raw materials, by weight, 15-40 parts of boric acid end-capped EPDM, 25-40 parts of polyolefin elastomer, 25-40 parts of polypropylene, 1.0-2.5 parts of N- (3, 4-dihydroxyphenethyl) -2-naphthamide and 0.5-1.0 part of antioxidant; The component B comprises the following raw materials, by weight, 50-70 parts of LLDPE, 20-30 parts of polypropylene, 0.02-0.06 part of a catalyst and 0.8-1.5 parts of an antioxidant. By adopting the technical scheme, the boric acid end-capped EPDM and the N- (3, 4-dihydroxyphenethyl) -2-naphthalimide with specific proportions are introduced into an insulating material system, and the boric acid end-capped EPDM and the N- (3, 4-dihydroxyphenethyl) -2-naphthalimide form a dynamic boric acid ester bond reversibly in the processing and using processes, so that a stable self-repairing three-dimensional crosslinked network is constructed. The network structure not only effectively avoids the problem of dielectric property deterioration caused by polar micromolecules in the traditional silane crosslinking process, but also endows the material with excellent heat resistance and unique damage self-repairing function, thereby realizing high unification of low dielectric constant, low dielectric loss, high heat resistance and self-repairing capability. Optionally, the weight ratio of the component A to the component B is (88-96) (4-12). Alternatively, the boric acid-terminated EPDM is prepared by a process comprising the steps of dissolving an epoxidized EPDM in an organic solvent, reacting with 3-aminophenylboronic acid at 60-85 ℃, and precipitating, wa