PVC imhando yepurasitiki inoshandiswa zvakanyanya mukuvaka zvinhu. Naizvozvo, haizotsiviwa kwenguva yakareba mune ramangwana, uye ichava netarisiro huru yekushandisa munzvimbo dzisina kusimba mune ramangwana.
Sezvatinoziva tose, kune nzira mbiri dzekugadzira PVC, imwe inzira yepasi rose ethylene, uye imwe ndiyo yakasarudzika nzira yecalcium carbide muChina. Kunobva ethylene nzira inonyanya petroleum, nepo kunobva calcium carbide nzira iri kunyanya marasha, limestone uye munyu. Zviwanikwa izvi zvinonyanya kuwanda muChina. Kwenguva yakareba, yeChina yePVC yecalcium carbide nzira yanga iri munzvimbo inotungamira. Kunyanya kubva 2008 kusvika 2014, China yePVC yekugadzira kugona kwecalcium carbide nzira yave kuwedzera, asi yakaunzawo matambudziko mazhinji ekuchengetedza kwezvakatipoteredza.
Iko kushandiswa kwesimba kwekugadzira calcium carbide kwakakura kwazvo, saka izvi zvinounza mamwe matambudziko kumagetsi eChina. Nekuti magetsi anogadzirwa nekupisa marasha, anoda kushandisa marasha akawanda, saka kupisa kwemarasha kunozosvibisa mhepo. Nekudaro, China yakaita shanduko mumitemo mumakore apfuura. China inogara ichivandudza cheni yayo yemaindasitiri. Ikozvino tave kuona kuti China yakaunza mafuta akawanda kunze kwenyika, uye mabhizinesi emuno anokurudzirwa kupinza oiri kuti agadzirise zvigadzirwa zvepasi. Naizvozvo, mumakore achangopfuura, vagadziri vatsva vakati wandei ethylene process yakawedzerwa muChina, uye ese matsva ekugadzira PVC muChina mumakore achangopfuura ndiko kugona kwekugadzira ethylene process. Kugona kugadzira kweChina's calcium carbide nzira kwamisa kubvumidzwa kutsva. Naizvozvo, munguva pfupi iri kutevera, nhamba yemiti ye ethylene muChina icharamba ichiwedzera uye iyo calcium carbide process icharamba ichiderera. Mune ramangwana, huwandu hweChina hwekutengesa kunze kwe ethylene process icharamba ichiwedzera, uye zvishoma nezvishoma inove inotungamira pasi rose mutengesi we ethylene process PVC.
Nguva yekutumira: May-07-2022