Polyvinyl chloride (PVC) yog ntau yam thiab dav siv thermoplastic polymer. Nws cov koob meej tshwm sim los ntawm nws cov tshuaj tiv thaiv zoo heev, durability, thiab nqi-zoo. Txawm li cas los xij, PVC tuaj yeem ua rau brittleness thiab tsis tshua muaj zog, txwv nws daim ntawv thov hauv qee yam khoom. Txhawm rau kov yeej qhov kev txwv no, PVC cuam tshuam kev hloov pauv tau tsim los txhim kho qhov toughness thiab cuam tshuam ntawm PVC. Hauv tsab ntawv no, peb yuav tshawb txog cov hom tseem ceeb ntawm PVC cuam tshuam kev hloov pauv thiab lawv qhov zoo ntawm ntau yam khoom.
PVC cuam tshuam kev hloov pauv yog cov tshuaj ntxiv uas tau sib xyaw nrog PVC cob thaum lub sijhawm tsim khoom. Cov kev hloov pauv no ua haujlwm los ntawm kev txhim kho PVC lub peev xwm nqus thiab tawg lub zog thaum muaj kev cuam tshuam, yog li txo qhov kev pheej hmoo ntawm kev tawg lossis tawg. Peb hom tseem ceeb ntawm PVC cuam tshuam kev hloov pauv yog acrylic-based modifiers, chlorinated polyethylene (CPE), thiab MBS (methyl methacrylate-butadiene-styrene) modifiers.
Acrylic-raws li PVC cuam tshuam kev hloov pauv yog ib qho ntawm feem ntau siv additives. Lawv paub txog lawv cov huab cua zoo heev, pob tshab, thiab kev sib raug zoo nrog PVC. Acrylic modifiers feem ntau yog siv rau sab nraum zoov daim ntaub ntawv xws li qhov rais profiles, fencing, thiab sab nraum zoov rooj tog. Lawv muaj peev xwm tiv taus huab cua hnyav, suav nrog UV hluav taws xob, ua rau lawv zoo tagnrho rau cov khoom siv PVC kav ntev thiab ruaj khov.
Chlorinated polyethylene (CPE) yog lwm qhov nrov PVC cuam tshuam hloov pauv. CPE modifiers yog tus cwj pwm los ntawm lawv cov cua sov ua haujlwm zoo, tshuaj lom neeg ua haujlwm, thiab kev hloov pauv kub tsawg. Cov kev hloov pauv no feem ntau siv hauv cov kav dej PVC, fittings, thiab xaim thiab cable rwb thaiv tsev. Qhov sib ntxiv ntawm CPE txhim kho qhov cuam tshuam lub zog thiab tiv thaiv kev tawg, ua kom lub neej ntev thiab kev ntseeg siab ntawm cov khoom no.
MBS modifiers, muaj li ntawm methyl methacrylate, butadiene, thiab styrene, muab ib tug tshwj xeeb ua ke ntawm toughness thiab pob tshab. Qhov no ua rau lawv tshwj xeeb tshaj yog haum rau cov ntawv thov uas ob qho tib si cuam tshuam thiab kev zoo nkauj tseem ceeb. MBS modifiers feem ntau yog siv rau hauv cov ntawv PVC, cov ntaub ntawv, thiab cov yeeb yaj kiab, nrog rau cov khoom siv hauv tsheb thiab cov khoom siv hauv tsev. Lawv lub peev xwm los tswj kom meej meej thiab cuam tshuam tsis zoo txawm tias qhov kub thiab txias ua rau lawv muaj ntau yam thiab hloov tau rau ntau yam khoom yuav tsum tau ua.
Hauv cov ntsiab lus, PVC cuam tshuam hloov pauv ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov kav ntev thiab kev ua haujlwm ntawm cov khoom siv PVC. Acrylic-based modifiers, CPE, thiab MBS modifiers yog hom tseem ceeb ntawm PVC cuam tshuam kev hloov pauv, txhua qhov muab qhov zoo sib txawv hauv kev siv sib txawv. Acrylic modifiers ua tau zoo hauv cov khoom siv sab nraum zoov, CPE yog qhov zoo tagnrho rau cov kav dej thiab cables, thaum MBS modifiers muaj ntau yam thiab siv dav hauv ntau yam lag luam. Los ntawm kev sib koom ua ke cov kev hloov pauv no, cov khoom siv PVC tuaj yeem kov yeej lawv cov brittleness thiab ua tiav cov kev cuam tshuam zoo, ua kom lawv lub neej ntev thiab kev ntseeg siab hauv ntau hom kev siv.
