Esinye isizathu siwukuthi amandla endawo okuncibilika ngokwawo aphansi kakhulu, okwenza amabhamuza akheke ngaphandle ngaphakathi;
Isizathu sesibili ukuthi ngenxa yengcindezi ephansi ezungeze ukuncibilika, amabhamuza endawo ayakhula futhi amandla awo abe buthaka, enze amabhamuza avela ngaphakathi nangaphandle. Emsebenzini wokukhiqiza, cishe awukho umehluko phakathi kwale misebenzi emibili, futhi kungenzeka ukuthi ikhona ngesikhathi esisodwa. Iningi lamabhamuza libangelwa ukwanda okungalingani kwamabhamuza endawo, okuholela ekwehleni kwamandla ancibilikayo.
Kafushane, ukukhiqizwa kwamabhamuza kumashidi epulasitiki anegwebu kufaka phakathi izici ezilandelayo:
Ukukhiqizwa kwebhodi legwebu le-PVC ngokuvamile kuthatha izilawuli ezintathu ezihlukene zegwebu le-PVC: uhlobo lokushisa, uhlobo lwe-endothermic, noma uhlobo lwe-endothermic ne-exothermic composite equilibrium. Izinga lokushisa lokubola le-PVC elinegwebu liphezulu, lifinyelela ku-232 ℃, lidlula kude izinga lokushisa lokucubungula le-PVC. Lapho uyisebenzisa, izinga lokushisa lokubola lidinga ukwehliswa. Ngakho-ke, lapho ulawula ukugwebulwa kwezinto ze-PVC, izilawuli ze-PVC ezinegwebu ngokuvamile ziyakhethwa. Lolu hlobo lwesilawuli esinegwebu lunezinga eliphezulu lokukhihliza amagwebu, cishe u-190-260ml/g, isivinini sokubola ngokushesha, nokukhululwa okukhulu kokushisa. Nokho, isikhathi sokukhihliza amagwebu sifushane futhi ukuzuma nakho kunamandla. Ngakho-ke, lapho umthamo we-agent ye-PVC ogwebuzelayo uphakeme kakhulu futhi isizukulwane segesi sikhulu kakhulu, kuzokwenza ukuthi ingcindezi ngaphakathi kwebhamuza ikhule ngokushesha, ubukhulu bebhamuza bukhule kakhulu, futhi igesi izokhishwa ngokushesha, kubangela umonakalo esakhiweni sebhamuza, ukusatshalaliswa okungalingani kosayizi webhamuza, ngisho nokwakheka kwesakhiwo seseli evulekile, esizokhiqiza amabhamuza amakhulu nama-voids endaweni. Lapho kukhiqizwa imikhiqizo yepulasitiki enegwebu, izilawuli ezikhipha amagwebu ze-PVC ezishisayo akufanele zisetshenziswe zodwa, kodwa kufanele zisetshenziswe ngokuhambisana nama-endothermic foaming agents noma ngokuhambisana nokushisa kanye nama-exothermic composite composite chemicals foaming agents. I-inorganic foaming ejenti - i-sodium bicarbonate (NaHCO3) i-endothermic foaming agent. Nakuba izinga lokukhihliza amagwebu liphansi, isikhathi sokukhihliza amagwebu side. Uma ixubene nezilawuli ze-PVC ezinegwebu, ingadlala indima ehambisanayo nelinganiselayo. I-exothermic PVC eyenza amagwebu ithuthukisa ikhono lokukhiqiza igesi ye-endothermic Foaming agent, kuyilapho isilawuli se-endothermic se-PVC esenza amagwebu sipholise okwangaphambili, simise ukubola kwayo, futhi silinganise ukukhishwa kwegesi, sinqande ukuwohloka kokushisisa ngokweqile kwangaphakathi kwamapuleti awugqinsi, sinciphise imvula izinsalela, futhi ezinomthelela wokuba mhlophe.
Ngokwesisekelo sokungathinti izinga lokukhihliza amagwebu, kuyafaneleka ukwengeza izilawuli ezengeziwe ze-Endothermic PVC ezikhipha amagwebu esikhundleni samanye ama-exothermic amagwebu, ukuze kucindezelwe ukuqhuma okubangelwa ukwengeza amagwebu amaningi ashisayo.
Isikhathi sokuthumela: May-13-2024
