Esinye isizathu ukuthi amandla endawo okuncibilika ngokwako aphansi kakhulu, okubangela ukwakheka kwamabhamuza avela ngaphandle ngaphakathi;
Isizathu sesibili ukuthi ngenxa yokucindezela okuphansi okuzungeze ukuncibilika, amabhamuza endawo ayakhula futhi amandla awo ayancipha, kwakha amabhamuza kusukela ngaphakathi kuya ngaphandle. Ekuzilolongeni kokukhiqiza, cishe akukho mehluko phakathi kwale misebenzi emibili, futhi kungenzeka ukuthi akhona ngasikhathi sinye. Iningi lamabhamuza libangelwa ukwanda okungalingani kwamabhamuza endawo, okuholela ekunciphiseni kwamandla okuncibilika.
Ngamafuphi, ukukhiqizwa kwamabhamuza emaphepheni epulasitiki ane-foam kuhilela kakhulu izici ezilandelayo:
Ukukhiqizwa kwebhodi le-foam le-PVC ngokuvamile kusebenzisa izilawuli ezintathu ezahlukene ze-PVC foam: uhlobo lokushisa, uhlobo lwe-endothermic, noma uhlobo lwe-endothermic kanye nohlobo lwe-exothermic composite equilibrium. Izinga lokushisa lokubola kwe-PVC foaming regulator liphezulu, lifinyelela ku-232 ℃, lidlula kakhulu izinga lokushisa lokucubungula le-PVC. Uma ulisebenzisa, izinga lokushisa lokubola lidinga ukwehla. Ngakho-ke, lapho kulawulwa ukugqwala kwezinto ze-PVC, izilawuli ze-PVC foaming ngokuvamile zikhethwa. Lolu hlobo lwe-foaming regulator lunezinga eliphezulu lokugqwala, cishe i-190-260ml/g, ijubane lokugqwala okusheshayo, kanye nokukhishwa okukhulu kokushisa. Kodwa-ke, isikhathi sokugqwala sifushane futhi ukuzuma nakho kunamandla. Ngakho-ke, lapho umthamo we-PVC foaming agent uphezulu kakhulu futhi ukukhiqizwa kwegesi kukhulu kakhulu, kuzokwenza ukuthi ingcindezi ngaphakathi kwe-bubble ikhuphuke ngokushesha, ubukhulu be-bubble bukhule kakhulu, futhi igesi izokhishwa ngokushesha, okubangela umonakalo esakhiweni se-bubble, ukusatshalaliswa okungalingani kosayizi we-bubble, ngisho nokwakheka kwesakhiwo seseli esivulekile, esizokhiqiza amabhamuza amakhulu kanye nezimbobo endaweni. Uma kukhiqizwa imikhiqizo yepulasitiki enegwebu, izilawuli ze-PVC ezikhipha amagwebu e-exothermic akufanele zisetshenziswe zodwa, kodwa kufanele zisetshenziswe kanye nama-ejenti e-endothermic foaming noma zihlanganiswe nama-ejenti e-composite chemical foaming ahlanganisiwe okushisa kanye ne-exothermic balanced. I-ejenti ye-foaming engaphili - i-sodium bicarbonate (NaHCO3) iyi-ejenti ye-endothermic foaming. Nakuba izinga le-foaming liphansi, isikhathi se-foaming side. Uma ixutshwe nezilawuli ze-PVC foaming, ingadlala indima ehambisanayo nelinganiselayo. I-ejenti ye-PVC foaming exothermic ithuthukisa ikhono lokukhiqizwa kwegesi le-endothermic foaming agent, kuyilapho i-endothermic PVC foaming regulator ipholisa eyokuqala, izinzise ukubola kwayo, futhi ilinganisele ukukhishwa kwegesi, ivimbele ukuwohloka kwangaphakathi kwamapuleti aminyene, inciphise ukuna kwezinsalela, futhi ibe nomphumela wokuba mhlophe.
Ngenxa yokuthi akuthinti izinga lokugqwala, kufanelekile ukwengeza ezinye izilawuli ze-PVC ezisebenzisa i-endothermic foaming ukuze zithathe indawo yezinye izithasiselo ze-exothermic foaming, ukuze kuncishiswe ukuqhuma okubangelwa ukwengeza ezinye izithasiselo ze-exothermic foaming.
Isikhathi sokuthunyelwe: Meyi-13-2024
