Simintin yashi mai taurin kai ko simintin yashi ba gasa ba nasa ne na nau'in simintin yashi mai rufi kotsarin simintin gyare-gyaren harsashi. Yana amfani da kayan ɗaure sinadarai don haɗawa da yashi kuma ya ba su damar yin tauri da kansu. Saboda ba a buƙatar tsarin zafin jiki na farko, wannan tsari kuma ana kiransa no-bake yashi gyare-gyaren simintin gyaran kafa.
Sunan no-bake ya samo asali ne daga mai taurin kai da iskar oxygen da Swiss suka kirkira a farkon 1950, wato, busassun mai irin su linseed oil da man tung da ake hadawa da na'urorin desiccat na karfe (kamar cobalt naphthenate da aluminum naphthenate) da oxidant. (kamar potassium permanganate ko sodium perborate, da dai sauransu). Yin amfani da wannan tsari, za a iya taurare ginshiƙin yashi zuwa ƙarfin da ake buƙata don sakin mold bayan an adana shi na sa'o'i da yawa a zafin jiki. Ana kiransa hardening dakin zafin jiki (Air Set), hardening self (Self Set), sanyi hardening (Cold Set) da sauransu. Amma ba a kai ga taurin kai ba, wato babu yin burodi (Bake bake), domin ana bukatar bushewar da aka gama (core) na tsawon sa’o’i da yawa kafin a zuba a samu cikakkiyar taurin.
"Yashi mai taurin kai" kalma ce da ta bayyana bayan masana'antar kamfuta ta dauki nau'ikan sinadarai, kuma ma'anarsa ita ce:
1. A cikin tsarin hadawa da yashi, ban da ƙara mai ɗaure, an ƙara wani abu mai ƙarfi (hardening) wanda zai iya taurara mai ɗaure.
2. Bayan yin gyare-gyare da ƙwanƙwasa da irin wannan yashi, ba a yi amfani da magani (kamar bushewa ko busa iskar gas) don taurare ƙura ko ƙwanƙwasa, kuma gyaɗa ko ginshiƙi na iya taurare da kanta.
Tun daga karshen shekarun 1950 zuwa farkon shekarun 1960, a hankali aka samar da ainihin hanyar tauraruwar kai ba tare da tanda ba, wato hanyar da za a yi amfani da acid-cured (catalyzed) furotin resin ko phenolic resin, sannan an samar da hanyar tauraruwar man urethane. 1965. An gabatar da hanyar phenolurethane kai-hardening a 1970, da kuma phenolic ester. Hanyar taurin kai ya bayyana a cikin 1984. Saboda haka, manufar "yashi mai saita kai" ya dace da duk yashi mai taurare ta hanyar sinadarai, gami da yashin mai saiti, yashi gilashin ruwa, yashi siminti, yashi phosphate bonded yashi da yashi guduro.
A matsayin yashi mai ɗaure mai sanyi mai ɗaure kai, yashi resin fur shine farkon yashi mai ɗaure mai ɗaure da aka fi amfani da shi a halin yanzu.Kafuwar kasar Sin. Adadin resin da aka ƙara a cikin yashi gyare-gyare shine gabaɗaya 0.7% zuwa 1.0%, kuma adadin ƙarar guduro a cikin yashi gabaɗaya shine 0.9% zuwa 1.1%. Abubuwan da ke cikin aldehyde kyauta a cikin resin furan bai kai 0.3% ba, kuma wasu masana'antu sun ragu zuwa ƙasa da 0.1%. A cikin wuraren da aka gano a kasar Sin, yashi mai taurin kai ya kai matakin kasa da kasa ba tare da la'akari da yadda ake samar da simintin gyaran fuska ba.
Bayan haxa yashi na asali (ko yashi da aka karbo), guduro ruwa da mai kara kuzari a ko'ina, da kuma cika su a cikin babban akwatin (ko akwatin yashi), sa'an nan kuma matsa shi don taurare a cikin wani mold ko mold a cikin ainihin akwatin (ko akwatin yashi). ) a yanayin zafi na ɗaki, an samar da simintin gyare-gyare ko simintin simintin, wanda ake kira ƙirar akwatin sanyi mai ƙarfi (core), ko hanyar tauraruwar kai (core). Hanyar taurin kai za a iya raba shi zuwa guduro furan mai acid-catalyzed da phenolic guduro yashi hanya mai taurin kai, hanyar tauraruwar yashi na urethane da kuma hanyar taurin kai mai phenolic monoester.
Halayen asali na aikin gyare-gyaren gyare-gyaren kai tsaye sune:
1) Inganta daidaiton girman girmansimintin gyare-gyareda kuma yanayin da ake ciki.
2) Ƙaƙƙarfan yashi (core) yashi baya buƙatar bushewa, wanda zai iya ceton makamashi, kuma ana iya amfani da katako mai tsada ko akwatunan filastik da samfuri.
3) Yashi mai gyare-gyaren kansa yana da sauƙi don haɗawa da rugujewa, mai sauƙin tsaftace simintin gyare-gyare, kuma ana iya sake yin amfani da tsohon yashi da sake amfani da shi, wanda ke rage yawan ƙarfin aiki na core yin, yin samfuri, yashi fadowa, tsaftacewa da sauran hanyoyin sadarwa, da kuma yana da sauƙin gane injina ko sarrafa kansa.
4) Yawan juzu'i na guduro a cikin yashi shine kawai 0.8% ~ 2.0%, kuma cikakken farashin albarkatun ƙasa yana da ƙasa.
Saboda tsarin yin taurin kai yana da fa'idodi na musamman da aka ambata a sama, simintin gyare-gyaren yashi mai ƙarfi ba wai kawai ana amfani da shi don yin ƙwanƙwasa ba, har ma ana amfani da shi don yin gyare-gyare. Ya dace musamman don samar da yanki guda ɗaya da ƙaramin tsari, kuma yana iya samar da baƙin ƙarfe, simintin ƙarfe dasimintin gyare-gyaren da ba na ƙarfe ba. Wasu masana'antun kasar Sin sun maye gurbin busassun yashi na yumbu, da yashi na siminti, da wani bangare na maye gurbin yashi na gilashin ruwa.
Lokacin aikawa: Janairu-21-2021