Zakuthupi ndi ntchito zazikulu za PVC pothandizira zothandizira

PVC processing aid ndi thermoplastic graft polima yomwe imachokera ku polymerization ya methyl methacrylate ndi acrylate kudzera mumafuta odzola ambewu. Amagwiritsidwa ntchito kwambiri pokonza ndi kupanga zida za PVC. Zili ndi zotsatira zabwino pakuwongolera kukana kwazinthu za PVC. Iwo akhoza kukonzekera Mipikisano sitepe polymerization njira ntchito mbewu odzola polymerization, kuphatikizapo chikhalidwe mafuta polymerization ndi pachimake chipolopolo odzola polymerization. Ubwino wake uli mu kuthekera kulamulira zikuchokera, kukula, chipolopolo makulidwe, chiŵerengero cha chipolopolo pachimake utali wozungulira, pamwamba zinchito makhalidwe, etc. particles malinga ndi zosowa zosiyanasiyana pa kaphatikizidwe anachita ndondomeko, ndipo chifukwa tinthu kukula kugawa ndi yunifolomu. .

Zida zazikulu zopangira zida za PVC ndi ma acrylic esters ndi methyl methacrylate. Pakupanga kwenikweni, acrylate nthawi zambiri amapangidwa polima ndi ma monomers ena (monga styrene, acrylonitrile, ndi zina) kudzera pamafuta opaka kuti apange polima ndi kutentha kwa magalasi otsika, ndiko kuti, pakati ndi elastomer katundu, ndiyeno kumezanitsa copolymerized ndi methyl methacrylate. , styrene, ndi zina zotero kuti apange polima yokhala ndi maziko a chipolopolo. Zomwe zili zolimba za mafuta odzolawa opangidwa ndi polymerized nthawi zambiri zimakhala pafupifupi 45% ± 3%, ndipo mafuta odzolawo amauma ndi kutaya madzi m'thupi kuti madzi apangidwe akhale osachepera 1% (kagawo kakang'ono) kuti apeze mankhwala a ufa woyera.

Core shell lotion polymerization ndiye maziko aukadaulo wopanga utomoni wa ACR. Mapangidwe a chipolopolo cha ACR atha kugawidwa m'mitundu itatu: mawonekedwe olimba a chipolopolo chofewa, chipolopolo chofewa chofewa, komanso mawonekedwe olimba amitundu itatu. Komabe, mitundu yayikulu yomwe ikugulitsidwa pamsika ndi "soft core hard shell structure". Ma resin a ACR okhala ndi izi amakhala ndi ntchito yabwino ndipo amagwiritsidwa ntchito kwambiri. Pachimake chipolopolo odzola polymerization wa "zofewa pachimake cholimba dongosolo chipolopolo" ndi ndondomeko imene molimba monoma ndi kumezanitsa pa mbewu zofewa lalabala particles anapanga ndi sitepe yoyamba ya odzola polymerization. Mtundu ndi mlingo wa emulsifiers, pachimake-chipolopolo chiŵerengero, chipolopolo monoma kudyetsa njira, crosslinking mlingo wa mbewu latex particles (rabala pachimake), mbewu tinthu kukula, ndi mtundu ndi mlingo wa crosslinking agent onse zimakhudza kwambiri dongosolo pachimake-chipolopolo. ACR latex particles ndi ntchito yomaliza ya ACR.