An electrically insulating composite material and an electrical device comprising the same

Abstract

Electrically, insulating composite material is obtained from the form of a paper of a pressboard with an electrical device through post-treating by electron beam irradiation treatment, gamma irradiation treatment or x-ray irradiation treatment.

1 . An electrical insulating composite material in the form of a paper or a pressboard, wherein the electrically insulating composite material is obtained through post-treating by irradiation treatment. 
     
     
         2 . The electrically insulating composite material of  claim 1 , wherein the irradiation treatment for post-treating is electron beam irradiation treatment, gamma irradiation treatment, x-ray irradiation or combinations thereof. 
     
     
         3 . The electrically insulating composite material of  claim 2 , wherein the electron beam irradiation treatment, gamma irradiation treatment and x-ray irradiation is under ambient air or with the injection of inert gas. 
     
     
         4 . The electrically insulating composite material of  claim 2 , wherein the dose for the electron beam irradiation, gamma irradiation or x-ray irradiation is from 30 kGy to 300 kGy. 
     
     
         5 . The electrically insulating composite material of  claim 1 , wherein the electrically insulating composite material is composed of fiber and fibrid. 
     
     
         6 . The electrically insulating composite material of  claim 5 , wherein the said fiber comprises at least one of the following fibers: polyethylene terephthalate fiber, polyethylene naphthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyacrylonitrile fiber, poly (metaphenylene isophthamide) fiber, poly(paraphenylene terephthalamide) fiber, polysulfonamide fiber, polyphenylene sulphide fiber, polyphenylene oxide fiber, polyethersulfone fiber, polyetheretherketone fiber, polyetherimide fiber, and cellulose fiber. 
     
     
         7 . The electrically insulating composite material of  claim 5 , wherein the said fibrid comprises at least one of the following fibrids: polyacrylonitrile fibrid, polyethylene terephthalate fibrid, polyethylene naphthalate fibrid, polytrimethylene terephthalate fibrid, polybutylene terephthalate fibrid, poly (metaphenylene isophthamide) fibrid, and polysulfonamide fibrid. 
     
     
         8 . The electrically insulating composite material of  claim 5 , wherein the fiber is present in an amount of 5 wt % to 95 wt % and the fibrid is present in an amount of 5 wt % to 95 wt %, based on the total weight of the electrically insulating composite material. 
     
     
         9 . An electrical device comprising the electrically insulating composite material according to  claim 1 . 
     
     
         10 . The electrical device of  claim 9 , wherein the said device is an electrical transformer or an electrical motor. 
     
     
         11 . The electrical device of claim wherein the electrically insulating composite material is in the form of a spacer, barrier, strip, a paper wrapped conductor or press ring for insulation. 
     
     
         12 . The electrically insulating composite material of  claim 2 , wherein the dose for the electron beam irradiation, gamma irradiation or x-ray irradiation is from 50 kGy to 200 kGy. 
     
     
         13 . A method of forming electrically insulating composite material, comprising:
 mixing fibrids and fibers;   pressing the mixed fibrids and fibers into an electrically insulating composite material using at least one of a paper press or a multi-daylight hot press; and   irradiating the electrically insulating composite material.   
     
     
         14 . The method of  claim 13 , wherein pressing includes:
 heating the mixed fibrids and fibers;   cooling the heated mixed fibrids and fibers;   pressing the cooled mixed fibrids and fibers into the electrically insulating composite material formed as pressboard.   
     
     
         15 . The method of  claim 14 , wherein irradiating includes:
 irradiating by at least one of electron beam irradiation, gamma radiation, or x-ray irradiation.   
     
     
         16 . The method according to  claim 13 , wherein the irradiating includes a dose from 30 kGy to 300 kGy. 
     
     
         17 . The method according to  claim 13 , wherein the irradiating includes a dose from 50 kGy to 200 kGy. 
     
     
         18 . The method of  claim 13 , wherein the said fiber comprises at least one of the following fibers: polyethylene terephthalate fiber, polyethylene naphthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyacrylonitrile fiber, poly (metaphenylene isophthamide) fiber, poly(paraphenylene terephthalamide) fiber, polysulfonamide fiber, polyphenylene sulphide fiber, polyphenylene oxide fiber, polyethersulfone fiber, polyetheretherketone fiber, polyetherimide fiber, and cellulose fiber; and wherein the said fibrid comprises at least one of the following fibrids: polyacrylonitrile fibrid, polyethylene terephthalate fibrid, polyethylene naphthalate fibrid, polytrimethylene terephthalate fibrid, polybutylene terephthalate fibrid, poly (metaphenylene isophthamide) fibrid, and polysulfonamide fibrid. 
     
     
         19 . The method of  claim 13 , wherein the fiber is present in an amount of 5 wt % to 95 wt % and the fibrid is present in an amount of 5 wt % to 95 wt %, based on the total weight of the electrically insulating composite material. 
     
     
         20 . An electrically insulated composite material, comprising:
 fiber comprises at least one of the following fibers: polyethylene terephthalate fiber, polyethylene naphthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyacrylonitrile fiber, poly (metaphenylene isophthamide) fiber, poly(paraphenylene terephthalamide) fiber, polysulfonamide fiber, polyphenylene sulphide fiber, polyphenylene oxide fiber, polyethersulfone fiber, polyetheretherketone fiber, polyetherimide fiber, and cellulose fiber;   fibrid comprises at least one of the following fibrids: polyacrylonitrile fibrid, polyethylene terephthalate fibrid, polyethylene naphthalate fibrid, polytrimethylene terephthalate fibrid, polybutylene terephthalate fibrid, poly (metaphenylene isophthamide) fibrid, and polysulfonamide fibrid; and   wherein the fiber is present in an amount of 5 wt % to 95 wt % and the fibrid is present in an amount of 5 wt % to 95 wt %, based on the total weight of the electrically insulating composite material.