Esinye isizathu kukuba amandla asekuhlaleni okunyibilika ngokwako aphantsi kakhulu, nto leyo ebangela ukuba kuvele amaqamza avela ngaphandle ngaphakathi;
Isizathu sesibini kukuba ngenxa yoxinzelelo oluphantsi olujikeleze ukunyibilika, amaqamza asekuhlaleni ayanda kwaye amandla awo ayancipha, enze amaqamza angaphakathi aye ngaphandle. Kwindlela yokuvelisa, akukho mahluko phakathi kwale misebenzi mibini, kwaye kunokwenzeka ukuba akhona ngaxeshanye. Uninzi lwamaqamza lubangelwa kukwanda okungalinganiyo kwamaqamza asekuhlaleni, okubangela ukwehla kwamandla okunyibilika.
Ngamafutshane, ukuveliswa kwamaqamza kwiiplastiki ezinefoam kubandakanya ikakhulu ezi zinto zilandelayo:
Imveliso yebhodi yefoam yePVC ngokubanzi isebenzisa abalawuli abathathu abahlukeneyo befoam yePVC: uhlobo lokufudumeza, uhlobo lwe-endothermic, okanye uhlobo lwe-endothermic kunye nohlobo lwe-exothermic composite equilibrium. Ubushushu bokubola kwe-PVC foaming regulator buphezulu, bufikelela kwi-232 ℃, bugqitha kakhulu ubushushu bokucubungula bePVC. Xa uyisebenzisa, ubushushu bokubola kufuneka buncitshiswe. Ke ngoko, xa kulawulwa ukugqwala kwezinto zePVC, abalawuli befoam yePVC ngokubanzi bakhethwa. Olu hlobo lwe-foaming regulator lunesantya esiphezulu sokugqwala, malunga ne-190-260ml/g, isantya sokugqwala ngokukhawuleza, kunye nokukhululwa okukhulu kobushushu. Nangona kunjalo, ixesha lokugqwala lifutshane kwaye ngequbuliso nalo linamandla. Ke ngoko, xa umthamo we-PVC foaming agent uphezulu kakhulu kwaye ukuveliswa kwegesi kukhulu kakhulu, kuya kubangela ukuba uxinzelelo ngaphakathi kwe-bubble lunyuke ngokukhawuleza, ubungakanani be-bubble bukhule kakhulu, kwaye igesi iya kukhululwa ngokukhawuleza, ibangele umonakalo kwisakhiwo se-bubble, ukusasazwa okungalinganiyo kobukhulu be-bubble, kwanokwakheka kwesakhiwo seseli esivulekileyo, esiya kuvelisa amaqamza amakhulu kunye ne-voids kwindawo. Xa kuveliswa iimveliso zeplastiki ezinefoam, abalawuli be-PVC abaxovulayo be-exothermic akufuneki basetyenziswe bodwa, kodwa kufuneka basetyenziswe kunye neearhente ze-endothermic foam okanye xa zidityaniswe neearhente ze-composite chemical foam ezilungelelanisiweyo kunye ne-exothermic balanced. Iarhente ye-inorganic foam - i-sodium bicarbonate (NaHCO3) yiarhente ye-endothermic foam. Nangona izinga le-foam liphantsi, ixesha le-foam lide. Xa ixutywe nabalawuli be-PVC foam, inokudlala indima ehambelanayo nelinganayo. Iarhente ye-exothermic PVC foam iphucula amandla okuvelisa igesi yearhente ye-endothermic foam, ngelixa i-endothermic PVC foam regulator ipholisa i-eyokuqala, izinzise ukubola kwayo, kwaye ilinganise ukukhutshwa kwegesi, ithintela ukuwohloka kwangaphakathi kweplates ezityebileyo, inciphise ukuna kweentsalela, kwaye ibe nefuthe lokuba mhlophe.
Ngenxa yokuba ayichaphazeli izinga lokugqwala, kufanelekile ukongeza ezinye izilawuli ze-PVC ezisebenzisa i-endothermic foaming ukuze zithathe indawo yezinye ii-exothermic foaming agents, ukuze kuthintelwe ukuqhuma okubangelwa kukongeza ezinye ii-exothermic foaming agents.
Ixesha leposi: Meyi-13-2024
