Polyethylene terephthalate. Fomura yemakemikari iyi ndeye -OCH2-CH2OCOC6H4CO- Zita rechirungu: polyethylene terephthalate, rakapfupikiswa sePET, ipolymer yakakwira, inobva mukuoma kwemvura mumuviri kwe ethylene terephthalate. Ethylene terephthalate inowanikwa ne esterification reaction ye terephthalic acid ne ethylene glycol. PET ipolymer chena yakaita semukaka kana yero yakajeka, ine crystalline yakawanda ine pamusoro wakatsetseka uye unopenya. Ine hunyanzvi hwakanaka hwemuviri uye hwemakanika munzvimbo dzakasiyana dzekupisa. Tembiricha yekushandiswa kwenguva refu inogona kusvika 120°C. Kudzivirira kwemagetsi kwakanaka kwazvo. Kunyangwe pakupisa kwakanyanya uye kakawanda, hunyanzvi hwayo hwemagetsi huchiri hwakanaka, asi kuramba kwe corona kwakaderera. Kudzivirira kukwira, kuramba kuneta, kuramba kukweshana, uye kugadzikana kwemativi ese zvakanaka kwazvo.
mukana
1, ine hunhu hwakanaka hwemakanika, simba rekukanda rakapetwa katatu kusvika kashanu pane mamwe mafirimu, uye kuramba kwayo kupeta kwakanaka.
2, inodzivirira mafuta, mafuta, inonyungudutsa acid, inonyungudutsa alkali, uye zvinonyungudutsa zvakawanda.
3, ine simba rakanaka rekudzivirira kupisa kwepamusoro nepashoma. Inogona kushandiswa kwenguva yakareba munzvimbo yekupisa inosvika 120℃, uye inogona kutsungirira kupisa kwepamusoro kwe150℃ uye kupisa kwakaderera kwe -70℃ mukushandiswa kwenguva pfupi, uye hunhu hwemuchina hwekupisa kwepamusoro nepashoma hahuna simba rakawanda.
4, kupenya kwemhepo nemhepo ine utsi hwemvura kwakaderera, kureva kuti, ine gasi, mvura, mafuta uye kunhuhwirira kwakanaka.
5, kujeka kwakanyanya, kunogona kuvharira mwaranzi ye ultraviolet, kupenya kwakanaka.
6, isina chepfu, isina kunaka, ine hutsanana hwakanaka uye yakachengeteka, inogona kushandiswa zvakananga pakurongedza chikafu.
PET ipolymer ine girazi jena kana yero yakajeka ine kristalo yakawanda ine pamusoro wakatsetseka uye unopenya. Kuramba kwakanaka kwekukambaira, kuramba kuneta, kuramba kukweshana uye kugadzikana kwehukuru, kukweshana kwakaderera uye kuomarara kwakanyanya, ine kusimba kukuru pakati pezvinhu zve thermoplastic: kudzivirira kwakanaka kwemagetsi, simba shoma rekupisa, asi kuramba korona kwakaderera. Kupisa, kuramba mamiriro ekunze, kugadzikana kwakanaka kwemakemikari, kunyudzwa kwemvura kwakaderera, kuramba acids isina simba uye organic solvents, asi isina kunyudzwa mumvura inopisa uye alkali. PET resin ine tembiricha yepamusoro yekuchinja kwegirazi, kumhanya kwekristaro kunononoka, kutenderera kwenguva refu, kutenderera kwenguva refu, kuderera kukuru kwekugadzira, kugadzikana kwakashata kwehukuru, kuputsika kwekristaro, uye kuramba kupisa kwakaderera. Kuburikidza nekuvandudzwa kwe nucleating agent, crystallization agent uye glass fiber reinforcement, PET ine hunhu hunotevera kuwedzera kune hunhu hwePBT:
1, tembiricha yekukanganiswa kwekupisa uye tembiricha yekushandiswa kwenguva refu ndiyo yakanyanya kukwira pakati pezvinhu zvinoshandiswa nethermoplastic.
2, nekuda kwekudzivirira kupisa kwakanyanya, PET yakasimbiswa inonyudzwa mubhavhu rekusolder pa250°C kwemasekonzi gumi, uye haichinji ruvara. Inonyanya kukodzera kugadzirira zvikamu zvemagetsi nemagetsi zvakasolderwa.
3, simba rekukotama i200Mpa, elastic modulus i4000Mpa, kukwira nekuneta zvakanakawo, kuomarara kwepamusoro kwakanyanya, uye hunhu hwemakanika hwakafanana nepurasitiki yethermosetting.
4, sezvo ethylene glycol inoshandiswa mukugadzira PET iri hafu yemutengo webutylene glycol inoshandiswa mukugadzira, PET resin nePET yakasimbiswa ndiwo mutengo wakaderera pakati pemapurasitiki einjiniya uye ane mashandiro anodhura zvakanyanya.