Ib qho laj thawj yog tias lub zog hauv zos ntawm cov yaj nws tus kheej tsawg dhau, ua rau npuas tsim los ntawm sab nraud hauv;
Qhov thib ob yog vim li cas vim qhov qis qis nyob ib ncig ntawm cov yaj, cov npuas hauv zos nthuav dav thiab lawv lub zog tsis muaj zog, ua npuas los ntawm sab hauv tawm. Hauv kev xyaum ntau lawm, yuav luag tsis muaj qhov sib txawv ntawm ob lub luag haujlwm, thiab nws muaj peev xwm tias lawv muaj nyob ib txhij. Feem ntau ntawm cov npuas yog tshwm sim los ntawm qhov tsis sib xws ntawm kev nthuav dav ntawm cov npuas hauv zos, uas ua rau txo qis zog yaj.
Hauv cov ntsiab lus, tiam ntawm npuas hauv cov ntawv yas foamed feem ntau suav nrog cov hauv qab no:
Kev tsim cov PVC ua npuas ncauj feem ntau siv peb qhov sib txawv PVC ua npuas dej regulators: cua sov hom, endothermic hom, los yog endothermic thiab exothermic composite equilibrium hom. Lub decomposition kub ntawm PVC foaming regulator yog siab, ncav cuag 232 ℃, deb tshaj qhov kub ntawm PVC ua. Thaum siv nws, qhov decomposition kub yuav tsum tau qis dua. Yog li ntawd, thaum tswj cov foaming ntawm PVC cov ntaub ntawv, PVC foaming regulators feem ntau xaiv. Hom foaming regulator no muaj tus nqi siab foaming, txog 190-260ml / g, ceev decomposition ceev, thiab zoo tshav kub tso. Txawm li cas los xij, lub sij hawm foaming yog luv luv thiab lub suddenness kuj muaj zog. Yog li ntawd, thaum ntau npaum li cas ntawm PVC foaming tus neeg saib xyuas yog siab dhau lawm thiab cov roj tiam yog loj heev, nws yuav ua rau lub siab nyob rau hauv lub npuas yuav nce sai heev, qhov luaj li cas ntawm cov npuas yuav loj heev, thiab cov roj yuav tawm sai heev, ua rau muaj kev puas tsuaj rau cov qauv npuas, tsis sib npaug ntawm cov npuas loj, thiab txawm tias tsim cov qauv ntawm tes qhib, uas yuav tsim cov npuas loj thiab cov voids hauv zos. Thaum tsim cov khoom yas foamed, exothermic PVC foaming regulators yuav tsum tsis txhob siv ib leeg, tab sis yuav tsum tau siv nrog endothermic foaming agents los yog ua ke nrog kub thiab exothermic balanced composite tshuaj foaming agents. Inorganic foaming agent - sodium bicarbonate (NaHCO3) yog ib tug endothermic foaming agent. Txawm hais tias tus nqi foaming tsawg, lub sijhawm foaming yog ntev. Thaum sib xyaw nrog PVC foaming regulators, nws tuaj yeem ua lub luag haujlwm ntxiv thiab sib npaug. Cov exothermic PVC foaming tus neeg saib xyuas txhim kho cov roj tsim muaj peev xwm ntawm endothermic foaming tus neeg saib xyuas, thaum lub endothermic PVC foaming regulator cools tus qub, stabilizes nws decomposition, thiab sib npaug tso tawm roj, inhibiting lub sab hauv overheating degradation ntawm tuab daim hlau, txo cov nag lossis daus. residues, thiab muaj cov nyhuv whitening.
Nyob rau hauv lub premise ntawm tsis cuam tshuam rau tus nqi ua npuas ncauj, nws yog qhov tsim nyog ntxiv rau cov neeg sawv cev tshiab ntxiv, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau ua kom cov neeg sawv cev explosting ntxiv.
Post lub sij hawm: May-13-2024
