Kuwedzera Kusvika Kwemavharuvhu Epurasitiki

Kunyange zvazvo dzimwe nguva mavharuvhu epurasitiki achionekwa sechinhu chakakosha—sarudzo yepamusoro yeavo vanogadzira kana kugadzira zvigadzirwa zvepurasitiki zvemaindasitiri kana kuti vanofanira kunge vaine michina yakachena kwazvo—tichifunga kuti mavharuvhu aya haana kushandiswa kwakawanda, hazvina musoro. Muchokwadi, mavharuvhu epurasitiki nhasi ane mashandisirwo akasiyana-siyana sezvo mhando dzezvinhu dziri kuwedzera uye vagadziri vakanaka vanoda zvinhu izvozvo zvinoreva nzira dzakawanda dzekushandisa zvishandiso izvi zvinoshanduka-shanduka.

ZVIMBO ZVEPULASTIKI
Zvakanakira mavharuvhu epurasitiki zvakawanda—kusagadzikana kwengura, makemikari uye kukwesha; madziro emukati akatsetseka; huremu hushoma; nyore kuisa; tarisiro yekurarama kwenguva refu; uye mutengo wakaderera wehupenyu. Zvakanakira izvi zvakaita kuti mavharuvhu epurasitiki anyanye kugamuchirwa mumashandisirwo emabhizimisi nemaindasitiri akadai sekuparadzirwa kwemvura, kurapwa kwemvura yakasviba, kugadziriswa kwesimbi nemakemikari, chikafu nemishonga, mafekitori emagetsi, nzvimbo dzekuchenesa mafuta nezvimwewo.
Mavharuvhu epurasitiki anogona kugadzirwa kubva pazvinhu zvakasiyana-siyana zvinoshandiswa mumhando dzakasiyana-siyana. Mavharuvhu epurasitiki anonyanya kushandiswa akagadzirwa nepolyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), uye polyvinylidene fluoride (PVDF). Mavharuvhu ePVC neCPVC anowanzo batanidzwa kumapiping systems ne solvent cementing socket ends, kana kuti threaded and flanged ends; nepo, PP nePVDF zvichida kubatanidzwa kwezvikamu zvepiping system, kungave ne heat-, butt- kana electro-fusion technologies.

Kunyangwe polypropylene iine hafu yesimba rePVC neCPVC, ine simba rekudzivirira makemikari rinonyanya kushandiswa nekuti hapana zvinonyungudutsa zvinozivikanwa. PP inoshanda zvakanaka muacetic acids nehydroxides dzakasimba, uye yakakodzerawo mishonga isina kunyorova yeacetic acids, alkalis, munyu uye makemikari akawanda eorganic.

PP inowanikwa sechinhu chine ruvara kana chisina ruvara (chemuzvarirwo). PP yechisikigo inoparadzwa zvakanyanya nemwaranzi ye ultraviolet (UV), asi makemikari ane pigmentation yekabhoni nhema inopfuura 2.5% anogadzikiswa zvakakwana neUV.

Masisitimu ePVDF emapaipi anoshandiswa mumaindasitiri akasiyana-siyana kubva kumishonga kusvika kumigodhi nekuda kwesimba rePVDF, tembiricha yekushanda uye kusawirirana nemakemikari nemunyu, maasidhi akasimba, mabhesi akasanganiswa uye organic solvents akawanda. Kusiyana nePP, PVDF haikanganisike nezuva; zvisinei, purasitiki inopenya kuzuva uye inogona kupinza mvura kumwaranzi yeUV. Kunyange zvazvo fomura yePVDF yechisikigo, isina pigment yakanakira kushandiswa mukati memba, kuwedzera pigment yakaita sered-grade food kunobvumira kupenya kuzuva pasina kukanganisa mvura.