Dab tsi yog cov khoom siv ntawm cov yas yas kom zoo nkauj?
Apr 07, 2022
Tshuaj pleev ib ce yas hoses feem ntau yog ua los ntawm vinyl chloride monomers, polymers uas yog polymerized los ntawm cov pib xws li peroxides thiab azo tebchaw los yog los ntawm lub mechanism ntawm dawb radical polymerization nyob rau hauv qhov kev txiav txim ntawm lub teeb thiab kub. Vinyl chloride homopolymers thiab vinyl chloride copolymer yog sau ua ke hu ua vinyl chloride resins. Nws cov khoom yog cov khoom siv amorphous. Hauv kev siv cov ntaub ntawv PVC, stabilizers, lubricants, auxiliary processing agents, pigments, impact resistance agents and other additives are feem ntau ntxiv. Nws muaj non-flammable, siab zog, huab cua tsis kam thiab zoo heev geometric stability.
PVC muaj zog heev rau oxidizing cov neeg ua haujlwm, txo cov neeg ua haujlwm thiab muaj zog acids. Txawm li cas los xij, nws tuaj yeem raug corroded los ntawm cov concentrated oxidizing acids xws li concentrated sulfuric acid thiab concentrated nitric acid thiab kuj tsis haum rau kev sib cuag nrog cov ntxhiab hydrocarbons thiab chlorinated hydrocarbons.
Kev xaiv ntawm cosmetic yas hose kav:
A. Kev tu cev ntawm cov khoom siv tshuaj pleev ib ce yas hose
Ua ntej tshaj plaws, cov ntaub ntawv siv yuav tsum tau ua raws li cov qauv kev tu cev, thiab cov khoom tsim kev puas tsuaj xws li cov hlau hnyav thiab cov tshuaj fluorescent yuav tsum tau tswj xyuas nyob rau hauv ntau yam. Piv txwv li, rau cov hoses xa tawm mus rau Tebchaws Meskas, cov polyethylene (PE) thiab polypropylene (PP) siv yuav tsum tau raws li US Food and Drug Administration (FDA) tus qauv 21CFR117.1520.
B. Barrier zog ntawm cov khoom siv yas hose kom zoo nkauj
Yog hais tias cov ntsiab lus ntawm lub pob ntawm lub tuam txhab tshuaj lom neeg niaj hnub yog cov khoom lag luam tshwj xeeb rau cov pa oxygen (xws li qee cov tshuaj pleev xim dawb) lossis cov khoom lag luam uas tsis muaj zog (xws li cov roj tseem ceeb lossis qee cov roj, acids, ntsev thiab lwm yam tshuaj corrosive), Lub sij hawm no yuav tsum tau siv tsib-txheej co-extruded raj. Vim tias cov pa oxygen kis ntawm tsib-txheej co-extruded raj (polyethylene / bonding resin / EVOH / bonding resin / polyethylene) yog 0.2 mus rau 1.2 units.
Cov pa oxygen kis tau tus nqi ntawm cov kav dej zoo tib yam polyethylene ib txheej yog 150 txog 300 units. Nyob rau hauv ib lub sij hawm ntawm lub sij hawm, qhov kev poob phaus tus nqi ntsuas ntawm lub co-extruded raj uas muaj ethanol yog ob peb zaug qis dua li ntawm ib leeg-txheej raj. Tsis tas li ntawd, EVOH yog ib qho ethylene-vinyl cawv copolymer nrog zoo heev barrier zog thiab fragrance tuav (qhov tuab ntawm 15-20 microns yog qhov zoo tshaj plaws). Ob txheej txheej yeeb nkab: high-density HDPE thiab LDPE low-density PE cov ntaub ntawv yog siv. Txoj kev siv cov twj tso kua mis sib npaug nrog qhov sib npaug ntawm lub raj tuaj yeem ua tiav qhov sib xyaw ua ke los ntawm kev sib hloov ceev. Txoj kev no tuaj yeem kho qhov hardness ntawm lub hose kom zoo. Piv nrog rau ib leeg-txheej raj, lub raj lub cev yog tuab thiab muaj kev tiv thaiv zoo dua. Corrosive barrier zog thiab qis dua oxygen kis tau tus mob yog saws los ntawm feem ntau ntawm cosmetic manufacturers.
C. Kev nruj ntawm cov khoom siv tshuaj pleev ib ce yas hose
Cov tuam txhab tshuaj niaj hnub muaj cov kev xav tau sib txawv rau cov hose txhav, yog li yuav ua li cas thiaj li tau txais qhov xav tau nruj? Cov polyethylene feem ntau siv hauv hoses feem ntau yog polyethylene low-density polyethylene, high-density polyethylene, thiab linear low-density polyethylene. Cov tawv nqaij ntawm high-density polyethylene yog zoo dua li ntawm low-density polyethylene, yog li qhov xav tau nruj tuaj yeem ua tiav los ntawm kev kho qhov piv ntawm high-density polyethylene / low-density polyethylene.
D. Tshuaj tiv thaiv ntawm cov khoom siv tshuaj pleev ib ce yas hose
HDPE Lower density polyethylene muaj tshuaj tiv thaiv zoo dua.
E. Huab cua tsis kam ntawm cov khoom siv tshuaj pleev ib ce yas hose
Txhawm rau tswj kev ua haujlwm luv luv lossis lub sijhawm ntev ntawm lub hose, yam xws li cov tsos, lub siab / poob tsis kam, lub zog foob, ib puag ncig kev ntxhov siab tawg tsis kam (ESCR tus nqi), tsw, thiab poob ntawm cov khoom xyaw nquag yuav tsum tau txiav txim siab.
