I-PVC luhlobo lweplastiki esetyenziswa ngokubanzi kwizinto zokwakha.Ngoko ke, ayiyi kutshintshwa ixesha elide kwixesha elizayo, kwaye iya kuba nethemba elikhulu lesicelo kwiindawo ezingaphuhliswanga kwixesha elizayo.
Njengoko sonke siyazi, kukho iindlela ezimbini zokuvelisa i-PVC, enye yindlela eqhelekileyo ye-ethylene yamazwe ngamazwe, kwaye enye yindlela ekhethekileyo ye-calcium carbide e-China.Imithombo yendlela ye-ethylene ikakhulu i-petroleum, ngelixa imithombo yendlela ye-calcium carbide ingamalahle, i-limestone kunye netyuwa.Ezi zixhobo zigxile kakhulu eTshayina.Ixesha elide, i-PVC yaseTshayina ye-calcium carbide indlela ikwindawo ekhokelayo ngokupheleleyo.Ngokukodwa ukusuka kwi-2008 ukuya kwi-2014, i-PVC yaseTshayina yokuvelisa amandla e-calcium carbide iye yanda, kodwa iye yazisa iingxaki ezininzi zokusingqongileyo.
Ukusetyenziswa kwamandla okuvelisa i-calcium carbide kukhulu kakhulu, ngoko oku kuya kubangela imingeni ethile kunikezelo lwamandla lwaseTshayina.Ngenxa yokuba umbane uveliswa ngokutshiswa kwamalahle, kufuneka utye amalahle amaninzi, ngoko ke ukutshiswa kwamalahle kuya kungcolisa umoya ojikeleze umhlaba.Nangona kunjalo, i-China yenze utshintsho oluthile kwimigaqo-nkqubo kwiminyaka.I-China ihlala iphucula ikhonkco lemizi-mveliso.Ngoku siyabona ukuba iChina ingenise ioli eninzi, kwaye amashishini asekuhlaleni ayakhuthazwa ukuba angenise ioli ukuze acokise iimveliso ezisezantsi.Ke ngoko, kwiminyaka yakutshanje, uninzi lwabavelisi benkqubo ye-ethylene entsha yongezwe eTshayina, kwaye yonke imveliso yePVC entsha eTshayina kwiminyaka yakutshanje ngamandla okuvelisa inkqubo ye-ethylene.Umthamo wemveliso wendlela yaseTshayina ye-calcium carbide uyekile ukuvunywa okutsha.Ngoko ke, kwixesha elizayo, inani lezityalo ze-ethylene e-China liya kuqhubeka nokunyuka kwaye inkqubo ye-calcium carbide iya kuqhubeka iyancipha.Kwixesha elizayo, umthamo wokuthumela ngaphandle kweTshayina inkqubo ye-ethylene iya kuqhubeka ukwanda, kwaye ngokuthe ngcembe ibe ngumthengisi ohamba phambili wehlabathi wenkqubo ye-ethylene yePVC.
Ixesha lokuposa: May-07-2022