Tun farkon shekarun 1930, an yi amfani da mahaɗar polymer don inganta aikin turmi. Bayan da aka sami nasarar sanya ruwan shafa na polymer a kasuwa, Walker ya haɓaka tsarin bushewar feshi, wanda ya fahimci samar da ruwan shafa fuska a cikin nau'in foda na roba, ya zama farkon zamanin polymer ɗin da aka gyara busasshen turmi mai gauraya.
Sama da shekaru 100, an yi amfani da fale-falen yumbu a matsayin abin rufe bango da benaye. A zamanin yau, sun zama kayan ado ba makawa. Ana iya ganin fale-falen fale-falen masu girma dabam, ƙira, da maki ko'ina. Tare da ci gaban fasahar tayal yumbura, jikin yumbura yana ƙara girma kuma ya fi girma, yana haifar da ƙalubale ga shimfidar yumbura. Yadda ake yin fale-falen fale-falen yumbu masu girma su tsaya da ƙarfi kuma tabbatar da amincin kwanciya na dogon lokaci ya zama sabon mai da hankali a fagen kayan ado na zamani. Ana jika kayan manne (kamar polymer) a saman fale-falen yumbu, suna samar da yanayin jika tsakanin su biyun, yana haifar da ɗan ƙaramin tazara tsakanin su biyun. Daga ƙarshe, ana samun ƙaƙƙarfan ƙarfi na intermolecular a mahaɗin haɗin gwiwa, yana haɗa kayan manne tare da tayal yumbura tam. Tare da ci gaban fasahar tayal yumbura, fale-falen fale-falen yumbu masu yawa suna da wahala a samar da ƙarin giɓi don haɗa haɗin injin don samar da anga. Koyaya, haɗin gwiwar intermolecular yana ƙara zama mahimmanci.
Redispersible latex foda (RDP) Yana samar da hanyar sadarwa ta polymer a cikin samfuran turmi, haɗa fale-falen fale-falen buraka da turmi ta hanyar rundunonin ƙwayoyin cuta. Ko da fale-falen sun yi yawa, za su iya tsayawa da ƙarfi ga turmi. Redispersible latex foda yana samuwa ta hanyar polymerization na polymers biyu ko fiye, kuma yana da taurin daban-daban dangane da nau'i daban-daban na abun da ke ciki na polymer. Lokacin da ke cikin yanayin zafi mai zafi, foda na roba zai nuna nau'i daban-daban na laushi saboda taurin kansa. Da wuya foda mai mannewa, ƙananan digiri na laushi a cikin zafin jiki guda ɗaya, kuma mafi ƙarfin ikon tsayayya da sojojin waje a yanayin zafi. Sabili da haka, don manne foda da aka yi amfani da shi a cikin yumbu mai yumbura, ya kamata a ba da fifiko ga zaɓar babban foda mai ƙura, wanda zai iya tabbatar da ingantaccen mannewa na dogon lokaci a cikin yanayin zafi mai zafi. Lokacin amfani da hanyar ƙirar ƙirar bakin ciki don ginin tayal, don dacewa da ginin, ma'aikata za su zaɓi yin amfani da manne akan babban yanki kafin a ci gaba da aikin tayal. A lokacin wannan tsari, mannen tayal yumbu zai samar da fata akan saman da aka fallasa saboda saurin iskar muhalli, shayar da ruwa, da rushewar ether na cellulose na ciki da motsi. Saboda gaskiyar cewa wetting shine mabuɗin kusanci na kayan, lokacin da ɓawon burodi yana da wuyar karyewa, zai sa ya yi wahala ga mannen tayal don jika saman tayal, a ƙarshe yana rinjayar ƙarfin haɗin gwiwa. Zaɓin foda na latex wanda za'a iya rarrabawa, a gefe guda, saboda tsarinsa, zai iya taka muhimmiyar rawa wajen riƙe ruwa, jinkirta yawan hydration da fata. A gefe guda, yana iya inganta ƙarfin mannewa a kowane yanki na yanki, ko da an rage yankin infiltration, zai iya tabbatar da ƙarfin mannewa gaba ɗaya. A lokaci guda kuma, yana da mahimmanci don zaɓar ether cellulose a hankali. Yayin da girman fale-falen fale-falen yumbu ke ƙaruwa, yana ƙara samun sauƙin samun faɗuwar fale-falen buraka har ma da abin da ya faru na raguwar tayal yumbura bayan kwanciya. Wannan batu yana da alaƙa da alaƙa da sassaucin kayan haɗin gwiwa. Fale-falen fale-falen yumbu suna da girma mai yawa da ƙarancin lalacewa, kuma tushen tushe na iya samun nakasu mai mahimmanci saboda dalilai daban-daban na waje da na ciki. Manne tayal yumbu da aka yi amfani da shi azaman abin haɗawa dole ne ya iya ɗaukar damuwa da lalacewa ta haifar. Idan mannen tile na yumbu ba ya ƙunshi foda mai mannewa ko kuma yana da ƙarancin abun ciki na foda mai ɗanɗano, zai yi wahala a sha wahalar da ke haifar da nakasawa, yana haifar da faɗuwar gabaɗayan tsarin shimfidawa a hankali a wurare masu rauni, suna ƙirƙirar ganguna mara kyau.
Redispersible latex foda zai iya samar da tile m tare da ikon daidaita da danniya nakasawa, wanda inganta sassauci na tayal m. A cikin wannan tsarin, rigidity na yumbu tile m ne yafi samar da inorganic kayan kamar su ciminti da yashi, yayin da ake samar da sassauci ta m foda. Polymer yana shiga ta cikin ramukan dutsen siminti, yana samar da hanyar sadarwa ta polymer wanda ke aiki a matsayin haɗin gwiwa mai ƙarfi tsakanin sassa masu ƙarfi, yana ba shi sassauci. Lokacin da nakasawa ya faru, cibiyar sadarwar polymer na iya ɗaukar damuwa, tabbatar da cewa ƙaƙƙarfan abubuwan ba su fashe ko lalacewa ba. Don haka, haɓaka sassauƙan kayan mannewa yana da mahimmanci don rage ɓarna. Adadin da ya dace na manne foda zai iya inganta samuwar tsarin cibiyar sadarwa na polymer a cikin mannen tayal yumbura.
Lokacin aikawa: Agusta-08-2023