CN-122025318-A - Composite insulator epoxy resin core rod surface nondestructive roughening process

Abstract

The invention relates to the technical field of power equipment manufacturing, and particularly discloses a nondestructive roughening process for the surface of an epoxy resin core rod of a composite insulator. The process utilizes air flow pressure to splash or fix the pretreated inorganic powder on the surface of the core rod through a bonding layer during the heat curing drawing process of the epoxy resin core rod or after cooling and forming. By embedding or attaching inorganic particles on the surface layer of the resin, the physical roughness of the core rod is obviously improved on the premise of ensuring the structural integrity of the surface of the core rod and not generating microcracks and glass fiber breakage, so that a stable mechanical interlocking anchor point is provided for a subsequently coated silicone rubber sheath, and the interface bonding strength with the silicone rubber sheath is enhanced. The technology effectively solves the problems of stress concentration and interface defect caused by the traditional mechanical scraping technology, improves the operation reliability of the composite insulator, and has good application prospect.

Inventors

• NIU LEI
• XU CHEN
• PENG BIAO
• LIU SHENGJIE
• LIU TONGMEI
• FU YUFEI
• CHENG YANG
• GONG PEILIN
• Wu Zhouchang
• QIAN YALIN
• ZHONG JIANWEI
• CHEN ZHONGYUE
• YU CHENG

Assignees

• 国网安徽省电力有限公司安庆供电公司
• 国网安徽省电力有限公司电力科学研究院

Dates

Publication Date

20260512

Application Date

20260317

Claims (9)

1. 1. The nondestructive roughening process for the surface of the epoxy resin core rod of the composite insulator is characterized by comprising the following steps of: Firstly, carrying out surface pretreatment on inorganic powder; fixing the pretreated inorganic powder on the surface of the epoxy resin core rod by adopting a surface roughening process; The second step comprises any one of the following process schemes: In the process of the thermosetting drawing production technology of the epoxy resin core rod, the epoxy resin core rod which leaves a heating pipeline and is in an incompletely solidified state is sent into an air flow sand blasting device, the inorganic powder is sprayed and embedded into the surface of the epoxy resin core rod through air flow pressure, and the inorganic powder is fixed along with cooling and solidification of the epoxy resin core rod; And secondly, coating an epoxy resin adhesive on the surface of the cooled and molded epoxy resin core rod to form a glue applying layer, spraying the inorganic powder on the glue applying layer, and then thermally curing the epoxy resin adhesive to fix the inorganic powder.
2. 2. The surface nondestructive roughening process for the composite insulator epoxy resin core rod according to claim 1, wherein the technical means for surface pretreatment of the inorganic powder in the first step is one or more of plasma treatment, solid-phase stirring treatment in ozone atmosphere, nitric acid soaking treatment, concentrated sulfuric acid soaking treatment with concentration of more than 90%, and hydrogen peroxide soaking treatment.
3. 3. The process for non-destructive roughening of the surface of a composite insulator epoxy resin mandrel according to claim 1 or 2, wherein the inorganic powder is one of silica particles, wollastonite particles, silicate particles, alumina particles, aluminum nitride particles, and silicon carbide particles.
4. 4. The process for the nondestructive roughening of the surface of the epoxy resin core rod of the composite insulator according to claim 1 or 2, wherein the inorganic powder is a combination of several particles selected from the group consisting of silica particles, wollastonite particles, silicate particles, alumina particles, aluminum nitride particles and silicon carbide particles.
5. 5. The process for the nondestructive roughening of the surface of the epoxy resin core rod of the composite insulator according to claim 1, wherein the inorganic powder spraying density of the surface of the epoxy resin core rod is 40 to 6 ten thousand per square centimeter.
6. 6. The process for the nondestructive roughening of the surface of the epoxy resin core rod of the composite insulator according to claim 1, wherein after the step two is completed, the process further comprises the step of coating the roughened surface of the epoxy resin core rod with a silicone rubber adhesive.
7. 7. The process for the nondestructive roughening of the surface of the epoxy resin core rod of the composite insulator according to claim 1, wherein the process further comprises the step of coating the roughened surface of the epoxy resin core rod with an interface modifier special for the core rod of the composite insulator.
8. 8. A composite insulator epoxy resin mandrel surface non-destructive roughening process according to claim 3, wherein the particle size of the inorganic powder is 1 to 100 microns.
9. 9. The process for non-destructive roughening of the surface of an epoxy resin mandrel of a composite insulator according to claim 4, wherein the particle size of the inorganic powder is 1 to 100 microns.

Description

Composite insulator epoxy resin core rod surface nondestructive roughening process Technical Field The invention relates to the technical field of power equipment manufacturing, in particular to a nondestructive roughening process for the surface of an epoxy resin core rod of a composite insulator. Background Composite insulators are extremely important insulating devices in power lines and power transmission and transformation equipment, and the operation stability of the composite insulators is directly related to the safety of a power grid. The main components of the composite insulator comprise a glass fiber reinforced epoxy resin core rod, a silicone rubber sheath and an umbrella skirt which are wrapped outside the core rod, and an end fitting for connecting wires. The silicone rubber sheath is tightly wrapped on the surface of the epoxy resin core rod, and is a key structure and material for protecting the epoxy resin core rod from environmental corrosion. At present, the epoxy resin core rod is generally prepared by adopting a heat curing drawing process in production. The surface of the epoxy resin core rod prepared by the process is extremely smooth, so that the epoxy resin core rod is not easy to form firm adhesion with the silicone rubber material and the auxiliary adhesive material thereof. In order to improve the adhesion capability of the silicone rubber sheath to the epoxy mandrel, the prior art generally employs a mechanical scraping method to physically score the smooth mandrel surface to form a roughened surface to enhance the mechanical interlocking and adhesion strength of the mandrel to the silicone rubber. However, the mechanical scraping process has a significant disadvantage in practical application in that it damages the natural cured structure of the epoxy resin surface, and irregular holes and cracks generated on the surface of the epoxy resin core rod become stress concentration points for further degradation. Particularly, the reinforced glass fiber implanted in the epoxy resin is extremely easy to damage in the scraping process, and broken glass fiber generates floating fiber which is easy to break and move at the interface of the sheath and the core rod, so that the interface of the sheath and the core rod has air gap defects. In long-term operation, the interface defects can develop and expand gradually due to the action of an electric field and mechanical stress, so that the interface is crisp and decayed, and finally, the composite insulator is mechanically broken or electrically failed. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a surface nondestructive roughening process for a composite insulator epoxy resin core rod, which is realized by spraying or gluing inorganic powder. The method utilizes powder particles to construct physical anchor points on the surface of the core rod to form a mechanical interlocking structure, so that the bonding strength is enhanced. The damage to the surface of the epoxy resin core rod by the mechanical scraping process is effectively avoided, meanwhile, the roughness of the surface of the epoxy resin core rod is improved, and the interface bonding strength of the epoxy resin core rod and the silicon rubber is enhanced. In order to achieve the above purpose, the present invention provides the following technical solutions: The nondestructive roughening process for the surface of the epoxy resin core rod of the composite insulator comprises the following steps: step one, carrying out surface pretreatment on inorganic powder to improve the surface reactivity of the inorganic powder; Fixing the pretreated inorganic powder on the surface of the epoxy resin core rod by adopting a surface roughening process so as to improve the roughness of the surface of the epoxy resin core rod; step two comprises any one of the following process schemes: In the process of the thermosetting drawing production technology of the epoxy resin core rod, the epoxy resin core rod which leaves a heating pipeline and is in an incompletely solidified state is sent into an air flow sand blasting device, inorganic powder is sprayed and embedded into the surface of the epoxy resin core rod through air flow pressure, and the inorganic powder is fixed along with cooling and solidification of the epoxy resin core rod; And secondly, coating an epoxy resin adhesive on the surface of the cooled and molded epoxy resin core rod to form a sizing layer, spraying inorganic powder on the sizing layer, and then thermally curing the epoxy resin adhesive to fix the inorganic powder. As a further scheme of the invention, the technical means for carrying out surface pretreatment on the inorganic powder in the first step is one or more of plasma treatment, solid-phase stirring treatment in ozone atmosphere, nitric acid soaking treatment, concentrated sulfuric acid soaking treatment with concentration of more than 90 percent and hydrogen pe