Halayen zahiri da manyan ayyukan kayan aikin sarrafa PVC

Taimakon sarrafa PVC wani polymer ne mai amfani da thermoplastic wanda aka samo daga polymerization na methyl methacrylate da acrylate ta hanyar man shafawa iri. Ana amfani da shi galibi don sarrafawa da samar da kayan PVC. Yana da tasiri mai kyau akan inganta juriyar tasirin kayan PVC. Yana iya shirya hanyar polymerization matakai da yawa ta amfani da polymerization na man shafawa iri, gami da polymerization na man shafawa na gargajiya da polymerization na man shafawa na harsashi na tsakiya. Amfaninsa ya ta'allaka ne akan ikon sarrafa abun da ke ciki, girmansa, kauri harsashi, rabon harsashi zuwa radius na tsakiya, halayen aikin saman, da sauransu na barbashi bisa ga buƙatu daban-daban yayin aikin haɗakarwa, kuma rarrabawar girman barbashi da aka samu iri ɗaya ne.

Manyan kayan da ake amfani da su wajen sarrafa PVC sune acrylic esters da methyl methacrylate. A zahiri, acrylate yawanci ana yin polymer da shi tare da wasu monomers (kamar styrene, acrylonitrile, da sauransu) ta hanyar shafawa don samar da polymer mai ƙarancin zafin canjin gilashi, wato, tsakiya mai halayen elastomer, sannan a haɗa shi da methyl methacrylate, styrene, da sauransu don samar da polymer mai tsarin harsashi na tsakiya. Abubuwan da ke cikin wannan man shafawa da aka yi da polymer gabaɗaya kusan 45% ± 3% ne, kuma man shafawa yana busarwa kuma yana bushewa don sanya ruwan samfurin ya zama ƙasa da 1% (ƙasa mai yawa) don samun samfuran farin foda.

Polymerization na man shafawa na harsashi shine ginshiƙin fasahar samar da resin ACR. Tsarin harsashi na tsakiya na ACR za a iya raba shi zuwa nau'i uku: tsarin harsashi mai laushi na harsashi mai tauri, tsarin harsashi mai tauri na tsakiya, da kuma tsarin harsashi mai tauri mai tauri mai tauri mai matakai uku. Duk da haka, babban nau'in da ake sayarwa a kasuwa a yanzu shine "tsarin harsashi mai tauri na tsakiya mai tauri". Resin ACR tare da wannan tsari suna da kyakkyawan aiki kuma ana amfani da su sosai. Polymerization na man shafawa na harsashi mai tauri na "tsarin harsashi mai tauri na tsakiya mai tauri" tsari ne da ake dasa monomer mai tauri akan iri na barbashi masu tauri na latex waɗanda aka samar ta hanyar matakin farko na polymerization na man shafawa. Nau'in da adadin emulsifiers, rabon harsashi mai tauri, hanyar ciyar da monomer na harsashi, matakin haɗin gwiwa na barbashi na latex iri (tsarin roba), girman barbashi na iri, da nau'in da kuma yawan wakilin haɗin gwiwa duk suna da tasiri mai mahimmanci akan tsarin harsashi mai tauri na barbashi na latex na ACR da aikin samfurin ƙarshe na ACR.