Maitiro ekupisa ePVC ndeokuti yakaoma kupisa, inodzima pakarepo mushure mekubva mumoto, murazvo utsi hweyero uye chena, uye plastiki inonyorovesa kana ichitsva, ichipa kunhuhwirira kunhuhwirira kweklorini.
Polyvinyl chloride resin ipurasitiki ine-multi-component.Zvimwe zvinowedzera zvinogona kuwedzerwa maererano nekushandiswa kwakasiyana.Nokudaro, nemhando dzakasiyana-siyana, zvigadzirwa zvayo zvinogona kuratidza zvakasiyana-siyana zvemuviri uye zvemagetsi.Semuenzaniso, inogona kukamurwa kuita zvigadzirwa zvinyoro uye zvakaoma zvine kana pasina plasticizer.Kazhinji, zvigadzirwa zvePVC zvine zvakanakira kugadzikana kwemakemikari, kumira kwemoto uye kuzvidzima, kusapfeka kusagadzikana, ruzha uye kubviswa kwekudengenyeka, kusimba kwepamusoro, kunaka kwemagetsi ekudzivirira, mutengo wakaderera, nzvimbo dzakafara, kusimba kwemhepo, nezvimwewo. kugadzikana kwekushisa uye kuchembera nyore pasi pechiito chechiedza, kupisa uye oksijeni.PVC resin pachayo haina chepfu.Kana zvigadzirwa zvakagadzirwa neasina-chepfu plasticizers, stabilizers uye zvimwe zvinhu zvekubatsira zvinoshandiswa, hazvina njodzi kuvanhu nemhuka.Nekudaro, mazhinji emaplasticizers uye stabilizer anoshandiswa muPVC zvigadzirwa zvinowanzoonekwa pamusika zvine muchetura.Naizvozvo, kunze kwezvigadzirwa zvine isiri-chepfu formula, hazvigone kushandiswa kuve nekudya.
1. Kuita muviri
PVC resin ndeye thermoplastic ine amorphous chimiro.Pasi pe ultraviolet mwenje, yakaoma PVC inoburitsa yebhuruu kana yepepuru chena fluorescence, nepo PVC yakapfava inoburitsa yebhuruu kana yebhuruu chena fluorescence.Kana tembiricha iri 20 ℃, iyo refractive index iri 1.544 uye iyo chaiyo giravhiti i1.40.Kuwanda kwezvigadzirwa zvine plasticizer uye filler kazhinji iri pakati pe1.15 ~ 2.00, density yePVC foam yakapfava i0.08~0.48, uye density yefuro rakaomarara i0.03~0.08.Kutorwa kwemvura kwePVC hakufanirwe kunge kwakakura kupfuura 0.5%.
Izvo zvemuviri uye zvemagetsi zvimiro zvePVC zvinoenderana nehuremu hwemamorekuru eresin, zviri mukati meplasticizer uye filler.Iyo yakakwira iyo molecular uremu hweresin, iyo yakakwira michina zvivakwa, kutonhora kupikisa uye kugadzikana kwekupisa, asi tembiricha yekugadzira inodiwawo kuve yakakwirira, saka zvakaoma kuumba;Low molecular weight inopesana nezviri pamusoro apa.Nekuwedzera kwekuzadza kwemukati, iyo tensile simba inoderera.
2. Thermal performance
Iyo yekupfavisa poindi yePVC resin iri padyo nekushisa kwekuparara.Yatanga kuora pa140 ℃, uye inoora nekukurumidza pa170 ℃.Kuti uve nechokwadi chemaitiro akajairwa ekuumbwa, iwo maviri akanyanya kukosha maratidziro ePVC resin anotsanangurwa, anoti decomposition tembiricha uye kugadzikana kwekupisa.Iyo inonzi decomposition tembiricha ndiyo tembiricha kana yakawanda yehydrogen chloride inoburitswa, uye iyo inonzi thermal kugadzikana ndiyo nguva iyo yakawanda yehydrogen chloride isingabudiswi pasi pemamwe mamiriro ekushisa (kazhinji 190 ℃).PVC plastiki inoora kana ikafumurwa ku100 ℃ kwenguva yakareba, kunze kwekunge alkaline stabilizer yawedzerwa.Kana ikadarika 180 ℃, inoora nekukurumidza.
Iyo tembiricha yenguva refu yekushandisa yakawanda yePVC zvigadzirwa zvepurasitiki haifanire kudarika 55 ℃, asi tembiricha yekushandisa kwenguva refu yePVC plastiki ine fomula yakakosha inogona kusvika 90 ℃.Zvigadzirwa zvePVC zvakapfava zvinoomesa patembiricha yakaderera.Mamorekuru ePVC ane maatomu eklorini, saka iwo nemacopolymers ayo anowanzo shingirira murazvo, kuzvidzima uye kudonha pasina.
3. Kugadzikana
Polyvinyl chloride resin i polymer isina kugadzikana, iyo inozosvibisa zvakare pasi pechiito chechiedza nekupisa.Maitiro ayo ndeyekuburitsa hydrogen chloride uye kushandura chimiro chayo, asi kusvika padiki.Panguva imwecheteyo, kuora kuchave kwakakurumidza pamberi pesimba remagetsi, okisijeni, kunhuwa, HCl uye mamwe maion simbi anoshanda.
Mushure mekubvisa HCl kubva kuPVC resin, conjugated kaviri maketani anogadzirwa pacheni huru, uye ruvara ruchachinjawo.Sezvo kuwanda kwehydrogen chloride kuparara kunowedzera, iyo PVC resin inoshanduka kubva kuchena kuenda kune yero, yakasimuka, tsvuku, brown uye kunyange dema.
4. Kuita kwemagetsi
Iwo emagetsi zvivakwa zvePVC zvinoenderana nehuwandu hwezvisaririra mupolymer uye rudzi uye huwandu hwezvakasiyana zvinowedzera mufomula.Zvinhu zvemagetsi zvePVC zvakabatanawo nekupisa: kana kupisa kunokonzera kuti PVC iparadze, kushandiswa kwayo kwemagetsi kuchaderedzwa nekuda kwekuvapo kwekloride ions.Kana iyo yakawanda yekloridi ion isingagoni kuderedzwa nealkaline stabilizers (yakadai semunyu wemutobvu), kuvharwa kwavo kwemagetsi kuchaderedzwa zvakanyanya.Kusiyana neasiri-polar mapolymers akadai se polyethylene uye polypropylene, PVC magetsi emagetsi anoshanduka ne frequency uye tembiricha, semuenzaniso, iyo dielectric inogara inoderera nekuwedzera kwefrequency.
5. Chemical properties
PVC ine yakanakisa kugadzikana kwemakemikari uye yakakosha zvikuru sechinhu chinodzivirira kupisa.
PVC yakagadzikana kune akawanda inorganic acids uye mabhesi.Iyo haizonyungudika kana yapiswa uye ichave yakaora kuburitsa hydrogen chloride.A brown insoluble unsaturated chigadzirwa chakagadzirwa neazeotropy ine potassium hydroxide.Kunyungudika kwePVC kune hukama nehuremu hwemamorekuru uye nzira yepolymerization.Kazhinji kutaura, kunyungudika kunodzikira nekuwedzera kwepolymer molecular uremu, uye kunyungudika kwe lotion resin kwakaipa kupfuura kuya kweresin yekumisikidza.Inogona kunyungudutswa mumaketoni (akadai cyclohexanone, cyclohexanone), zvinonhuhwirira zvinonyungudutsa (senge toluene, xylene), dimethylformyl, tetrahydrofuran.PVC resin inenge isinganyungudike mumaplasticizers patembiricha yekamuri, uye inozvimba zvakanyanya kana kutonyungudika pakupisa kwakanyanya.
⒍ kuita basa
PVC inonzi amorphous polymer isina inonyungudika iri pachena.Ipurasitiki kana ichipisa kusvika 120 ~ 150 ℃.Nekuda kwekusagadzikana kwayo kwekushisa, ine hushoma hweHCl pane ino tembiricha, iyo inosimudzira kuwedzera kwayo kuora.Naizvozvo, alkaline stabilizer uye HCl inofanira kuwedzerwa kuti inhibit maitiro ayo anokonzera kuparuka.Pure PVC chigadzirwa chakaoma, chinoda kuwedzerwa nehuwandu hwakakodzera hweplasticizer kuti ive yakapfava.Kune zvigadzirwa zvakasiyana, zvinowedzerwa zvakaita seUV absorbers, mafirita, mafuta ekuzora, pigment, anti mildew agents uye zvichingodaro zvinoda kuwedzerwa kuvandudza mashandiro ezvigadzirwa zvePVC.Kufanana nemamwe mapurasitiki, zvimiro zveresin zvinotarisa kunaka uye kugadzirisa mamiriro ezvigadzirwa.YePVC, iyo resin zvivakwa zvine chekuita nekugadzirisa zvinosanganisira saizi yechidimbu, kugadzikana kwekupisa, huremu hwemamorekuru, ziso rehove, kuwanda kwehuwandu, kuchena, kusvibiswa kwekunze uye porosity.Iyo viscosity uye gelatinization zvimiro zvePVC paste, paste, nezvimwe zvinofanirwa kuve zvakatemwa, kuitira kuti uzive mamiriro ekugadzirisa uye mhando yechigadzirwa.
Nguva yekutumira: Jul-07-2022