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CN-121991592-A - Graphene modified polysilazane composite coating for electric power protection and preparation method thereof

CN121991592ACN 121991592 ACN121991592 ACN 121991592ACN-121991592-A

Abstract

The invention discloses a graphene modified polysilazane composite coating for electric power protection and a preparation method thereof, and relates to the technical field of protective coatings. The graphene modified polysilazane composite coating for electric power protection at least comprises the following raw materials, by mass, 30-40 parts of perhydro polysilazane resin, 8-15 parts of phosphorus-containing polysilazane resin, 1-5 parts of aminated graphene, 1-5 parts of fluorine-containing silane coupling agent modified nano silicon dioxide, 3-10 parts of synergistic flame retardant, 0.2-0.8 part of silane coupling agent, 0.1-0.5 part of catalyst, 0.1-0.3 part of defoamer, 0.1-0.5 part of fumed silica, 5-15 parts of pigment and filler and 30-40 parts of xylene/n-butanol mixed solvent. The graphene modified polysilazane composite coating prepared by the method has high-efficiency flame retardance, superhydrophobic property and long-acting corrosion resistance, and can be directly sprayed under the conditions of temperature, rust and electrification.

Inventors

  • Request for anonymity
  • Request for anonymity

Assignees

  • 中烯国信新材料(南通)有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (8)

  1. 1. The graphene modified polysilazane composite coating for electric power protection is characterized by at least comprising the following raw materials in parts by mass: 30-40 parts of perhydro polysilazane resin, 8-15 parts of phosphorus-containing polysilazane resin, 1-5 parts of aminated graphene, 1-5 parts of fluorine-containing silane coupling agent modified nano silicon dioxide, 3-10 parts of synergistic flame retardant, 0.2-0.8 part of silane coupling agent, 0.1-0.5 part of catalyst, 0.1-0.3 part of defoaming agent, 0.1-0.5 part of fumed silica, 5-15 parts of pigment and filler and 30-40 parts of dimethylbenzene/n-butyl alcohol mixed solvent.
  2. 2. The graphene-modified polysilazane composite coating for electric power protection according to claim 1, wherein the preparation method of the phosphorus-containing polysilazane resin at least comprises the following preparation steps: 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and vinyl-containing polysilazane are dissolved in toluene, mixed solution of azodiisobutyronitrile and toluene is added dropwise, and after reflux reaction, the phosphorus-containing polysilazane resin is obtained through reduced pressure distillation, washing, rotary evaporation and drying.
  3. 3. The graphene-modified polysilazane composite coating for electric power protection according to claim 2, wherein the mass ratio of the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the vinyl-containing polysilazane is 2-5:10.
  4. 4. The graphene-modified polysilazane composite coating for electric power protection according to claim 1, wherein the preparation method of the fluorine-containing silane coupling agent modified nano silica at least comprises the following steps: under the protection of nitrogen, stirring and mixing tetrahydrofuran, trimethoxy hydrosilane and 2- (perfluorohexyl) ethyl methacrylate, adding Karstedt catalyst for reaction, and performing rotary evaporation to obtain fluorine-containing modified trimethoxy silane; Dispersing nano silicon dioxide in absolute ethyl alcohol, dropwise adding fluorine-containing modified trimethoxy silane for reaction, washing and drying to obtain fluorine-containing silane coupling agent modified nano silicon dioxide.
  5. 5. The graphene-modified polysilazane composite coating for electric power protection according to claim 4, wherein the mass ratio of trimethoxy silane to 2- (perfluorohexyl) ethyl methacrylate is 1:1-2, and the mass ratio of nano silica to fluorine-containing modified trimethoxy silane is 10:1-3.
  6. 6. The graphene-modified polysilazane composite coating for electric power protection according to claim 1, wherein the volume ratio of the xylene to the n-butanol in the xylene/n-butanol mixed solvent is 3-5:1, the synergistic flame retardant is at least one of aluminum hypophosphite, ammonium polyphosphate or melamine polyphosphate, and the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma- (2, 3-glycidoxy) propyl trimethoxysilane or vinyl trimethoxysilane.
  7. 7. The graphene-modified polysilazane composite coating for electric power protection according to claim 1, wherein the catalyst is at least one of dibutyltin dilaurate, stannous octoate or tetraisopropyl titanate, the defoaming agent is at least one of polyether-modified organosilicon defoaming agent or foam-breaking polymer type defoaming agent, and the pigment and filler is at least one of mica powder, sericite, barium sulfate or talcum powder.
  8. 8. The method for preparing the graphene-modified polysilazane composite coating for electric power protection according to any one of claims 1 to 7, comprising at least the following preparation steps: mixing perhydro polysilazane resin, phosphorus-containing polysilazane resin, aminated graphene, fluorine-containing silane coupling agent modified nano silicon dioxide, a synergistic flame retardant, a silane coupling agent, a catalyst, a defoaming agent, fumed silica, pigment and filler and a xylene/n-butanol mixed solvent, pre-dispersing for 30-60min at the rotating speed of 600-1000r/min, grinding to the fineness of less than or equal to 20 mu m, and filtering to obtain the graphene modified polysilazane composite coating for electric power protection.

Description

Graphene modified polysilazane composite coating for electric power protection and preparation method thereof Technical Field The invention relates to the technical field of protective coatings, in particular to a graphene modified polysilazane composite coating for electric power protection and a preparation method thereof. Background Electric power transmission and distribution equipment, such as transformer housings, switch cabinets, bus ducts, cable trays, and the like, are exposed to outdoor or complex industrial environments for long periods of time, and are subject to ultraviolet radiation, temperature cycling, moisture condensation, salt spray corrosion, chemical contaminants, and fire hazards caused by accidental arcing or overheating. Therefore, applying Tu Changxiao protective coatings to the surfaces of the power grids is a key measure for guaranteeing safe and stable operation of the power grids. Currently, commonly used power protection coatings include epoxy resin coatings, zinc-rich coatings, silicone resin coatings, and the like. The epoxy resin coating has strong adhesive force, good chemical resistance, but poor weather resistance and large brittleness, is easy to decompose at high temperature (100 ℃) and cannot meet the protection requirement of charged temperature equipment. The zinc-rich paint has good sacrificial anode protection effect, but has extremely high requirements on construction surface treatment, cannot be used for rust construction, and has poor insulativity. The traditional organic silicon resin coating has high temperature resistance and good insulativity, but generally has high curing temperature, long period, general adhesive force, limited flame retardant performance, mostly physical flame retardance and difficult satisfaction of high-standard flame retardant requirements. Polysilazane is used as a new generation of inorganic-organic hybrid polymer precursor, can be hydrolyzed and crosslinked to form a film at normal temperature, can be gradually converted into ceramic at higher temperature, has the easy construction property of a polymer coating and the high-temperature resistance, high hardness and oxidation resistance of a ceramic material, and has great potential in the field of electric power protection. However, the pure polysilazane coating has high hardness and insufficient toughness, is easy to generate microcracks and fall off under temperature circulation or mechanical impact, has flame retardance mainly due to the fact that a silicon dioxide ceramic layer is generated at high temperature to perform physical isolation, lacks an efficient gas phase or condensed phase flame retarding mechanism, has insufficient inhibiting capability on early flames, has limited long-term shielding capability on water vapor and corrosive media, has a narrow surface energy regulation range, and is difficult to realize special surface functions such as superhydrophobicity. In the prior art, although an attempt is made to compound polysilazane with various fillers, simple physical blending is easy to cause uneven dispersion of the fillers, weak interface bonding, limited performance improvement and possible negative effects. Therefore, the existing polysilazane coating has the defects of poor flame retardance, insufficient protective performance, easy falling and the like, so that the technology is very limited in use. Disclosure of Invention The invention aims to provide a graphene modified polysilazane composite coating for electric power protection and a preparation method thereof, which solve the following technical problems: the existing polysilazane composite coating is used for electric power protection, and has the problems of insufficient flame retardance, insufficient protective performance and easiness in falling off. The aim of the invention can be achieved by the following technical scheme: the graphene modified polysilazane composite coating for electric power protection at least comprises the following raw materials in parts by mass: 30-40 parts of perhydro polysilazane resin, 8-15 parts of phosphorus-containing polysilazane resin, 1-5 parts of aminated graphene, 1-5 parts of fluorine-containing silane coupling agent modified nano silicon dioxide, 3-10 parts of synergistic flame retardant, 0.2-0.8 part of silane coupling agent, 0.1-0.5 part of catalyst, 0.1-0.3 part of defoaming agent, 0.1-0.5 part of fumed silica, 5-15 parts of pigment and filler and 30-40 parts of dimethylbenzene/n-butyl alcohol mixed solvent. As a further scheme of the invention, the preparation method of the phosphorus-containing polysilazane resin at least comprises the following preparation steps: 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and vinyl-containing polysilazane are dissolved in toluene, mixed solution of azodiisobutyronitrile and toluene is added dropwise, and after reflux reaction, the phosphorus-containing polysilazane resin is obtained through reduced pressure distilla