Kugwiritsa Ntchito Domestic Hydroxypropyl Methyl Cellulose Pakupanga High Polymerization Degree ya Polyvinyl Chloride

Chidule: Kugwiritsa ntchito zinthu zapakhomohydroxypropyl methylcelluloseM'malo motumiza imodzi kuti ipange PVC yokhala ndi digiri yapamwamba ya polymerization idayambitsidwa. Zotsatira za mitundu iwiri ya hydroxypropyl methylcellulose pa katundu wa PVC yokhala ndi digiri yapamwamba ya polymerization zidafufuzidwa. Zotsatira zake zidawonetsa kuti zinali zotheka kusintha hydroxypropyl methyl cellulose yakunyumba m'malo mwa imodzi yochokera kunja.

Ma resini a PVC okhala ndi polymerization yapamwamba kwambiri amatanthauza ma resini a PVC okhala ndi polymerization yapakati yoposa 1,700 kapena yokhala ndi kapangidwe kolumikizana pang'ono pakati pa mamolekyulu, omwe ambiri mwa iwo ndi ma resini a PVC okhala ndi polymerization yapakati ya 2,500 [1]. Poyerekeza ndi utomoni wamba wa PVC, utomoni wa PVC wokhala ndi polymerization yapamwamba uli ndi mphamvu zambiri, mphamvu yaying'ono yopondereza, mphamvu yabwino yolimbana ndi kutentha, mphamvu yabwino yolimbana ndi ukalamba, mphamvu yokana kutopa komanso mphamvu yokana kukalamba. Ndi njira yabwino kwambiri yosinthira rabara ndipo ingagwiritsidwe ntchito mu zingwe zotsekera magalimoto, mawaya ndi zingwe, ma catheter azachipatala, ndi zina zotero. [2].

Njira yopangira PVC yokhala ndi polymerization yapamwamba kwambiri makamaka ndi suspension polymerization [3-4]. Pakupanga njira yoyimitsa, dispersant ndi wothandizira wofunikira, ndipo mtundu wake ndi kuchuluka kwake zidzakhudza mwachindunji mawonekedwe a tinthu, kukula kwa tinthu, ndi kuyamwa kwa pulasitiki kwa utomoni wa PVC womalizidwa. Machitidwe ofalikira omwe amagwiritsidwa ntchito kwambiri ndi polyvinyl alcohol systems ndi hydroxypropyl methylcellulose ndi polyvinyl alcohol composite dispersion systems, ndipo opanga m'nyumba amagwiritsa ntchito kwambiri izi [5].

1 Zipangizo zazikulu ndi zofunikira

Zipangizo zazikulu zopangira ndi zofunikira zomwe zagwiritsidwa ntchito mu mayesowa zawonetsedwa mu Table 1. Zitha kuwoneka kuchokera mu Table 1 kuti hydroxypropyl methylcellulose yakunyumba yomwe yasankhidwa mu pepalali ikugwirizana ndi hydroxypropyl methylcellulose yomwe yatumizidwa kunja, yomwe imapereka chofunikira pakuyesa kosintha mu pepalali.

2 Zomwe zili muyeso

2. 1 Kukonzekera yankho la hydroxypropyl methylcellulose

Tengani madzi enaake oyeretsedwa, muwaike mu chidebe ndikutentha mpaka 70°C, ndipo pang'onopang'ono onjezerani hydroxypropyl methylcellulose mukasakaniza nthawi zonse. Cellulose imayandama pamadzi poyamba, kenako imafalikira pang'onopang'ono mpaka itasakanikirana mofanana. Ziziritsani yankholo mpaka litachuluka.

Table 1 Zipangizo zazikulu ndi kufotokozera kwawo

2. 2 Njira yoyesera

Pa chipangizo choyesera chaching'ono cha 10 L, gwiritsani ntchito hydroxypropyl methyl cellulose yochokera kunja kuti muyesere mayeso oyambira kuti mudziwe njira yoyambira ya mayeso ang'onoang'ono; gwiritsani ntchito hydroxypropyl methyl cellulose yochokera kunja kuti muyike m'malo mwa hydroxypropyl methyl cellulose yochokera kunja kuti muyesere; Zinthu za PVC resin zopangidwa ndi hydroxypropyl methyl cellulose zosiyanasiyana zinayerekezeredwa kuti ziphunzire kuthekera kosintha hydroxypropyl methyl cellulose yochokera mkati. Malinga ndi zotsatira za mayeso ang'onoang'ono, mayeso opanga amachitika.

2. Masitepe atatu oyesera

Musanayambe kuchitapo kanthu, yeretsani ketulo ya polymerization, tsekani valavu ya pansi, onjezerani madzi enaake ochotsedwa mchere, kenako onjezerani dispersant; tsekani chivindikiro cha ketulo, pukutani vacuum mutatha kuyesa kwa nitrogen pressure, kenako onjezerani vinyl chloride monomer; mutatha kusakaniza kozizira, onjezerani choyambitsa; Gwiritsani ntchito madzi ozungulira kuti mukweze kutentha kwa ketulo kufika pa kutentha kwa reaction, ndikuwonjezera yankho la ammonium bicarbonate munthawi yake panthawiyi kuti musinthe pH ya dongosolo la reaction; pamene kuthamanga kwa reaction kutsika ku kuthamanga komwe kwafotokozedwa mu fomula, onjezani choletsa ndi chotsukira, ndikutulutsa. Chopangidwa chomalizidwa cha PVC resin chinapezeka mwa centrifugation ndi kuumitsa, ndikuyesedwa kuti chisanthulidwe.

2. 4 Njira zowunikira

Malinga ndi njira zoyenera zoyesera mu muyezo wa bizinesi Q31/0116000823C002-2018, kuchuluka kwa kukhuthala, kukhuthala koonekera, zinthu zosinthasintha (kuphatikiza madzi) ndi kuyamwa kwa pulasitiki kwa utomoni wa PVC wa 100 g wa utomoni womalizidwa wa PVC zinayesedwa ndi kufufuzidwa; Kukula kwapakati kwa tinthu ta utomoni wa PVC kunayesedwa; mawonekedwe a tinthu ta utomoni wa PVC anawonedwa pogwiritsa ntchito maikulosikopu yamagetsi yowunikira.

3 Zotsatira ndi Kukambirana

3. 1 Kusanthula koyerekeza kwa ubwino wa magulu osiyanasiyana a utomoni wa PVC mu polymerization yaying'ono

Dinani 2. Malinga ndi njira yoyesera yomwe yafotokozedwa mu 4, gulu lililonse la utomoni wa PVC womalizidwa pang'ono linayesedwa, ndipo zotsatira zake zikuwonetsedwa mu Table 2.

Zotsatira za Gome 2 za magulu osiyanasiyana a mayeso ang'onoang'ono

Zitha kuwoneka kuchokera pa Gome 2: Kuchuluka koonekera, kuchuluka kwa kukhuthala, ndi kuyamwa kwa pulasitiki kwa utomoni wa PVC komwe kwapezeka kuli pafupi kwambiri pogwiritsa ntchito cellulose yosiyana pa mayeso ang'onoang'ono; utomoni womwe wapezeka pogwiritsa ntchito njira ya hydroxypropyl methylcellulose. Kukula kwa tinthu tating'onoting'ono ndi kochepa pang'ono.

Chithunzi 1 chikuwonetsa zithunzi za SEM za zinthu za PVC resin zomwe zapezeka pogwiritsa ntchito mitundu yosiyanasiyana ya hydroxypropyl methylcellulose.

(1)—Hydroxypropyl methylcellulose yochokera kunja

(2)—Hydroxypropyl methylcellulose ya m'nyumba

Chithunzi 1 SEM ya ma resini opangidwa mu polymerizer ya 10-L pamaso pa ma hydroxypropyl methyl cellulose osiyanasiyana

Zikuoneka kuchokera pa Chithunzi 1 kuti kapangidwe ka pamwamba pa tinthu ta PVC resin tomwe timapangidwa ndi ma cellulose dispersants osiyanasiyana ndi kofanana.

Mwachidule, zitha kuwoneka kuti hydroxypropyl methylcellulose yakunyumba yomwe yayesedwa mu pepalali ili ndi kuthekera kosintha hydroxypropyl methylcellulose yochokera kunja.

3. 2 Kusanthula koyerekeza kwa ubwino wa utomoni wa PVC wokhala ndi digiri yapamwamba ya polymerization mu mayeso opanga

Chifukwa cha mtengo wokwera komanso chiopsezo cha mayeso opanga, njira yonse yosinthira mayeso ang'onoang'ono singagwiritsidwe ntchito mwachindunji. Chifukwa chake, njira yowonjezera pang'onopang'ono gawo la hydroxypropyl methylcellulose yapakhomo mu fomula yatengedwa. Zotsatira za mayeso a gulu lililonse zikuwonetsedwa mu Table 3.

Gome 3 Zotsatira za mayeso a magulu osiyanasiyana opanga

Zikuoneka kuchokera pa Table 3 kuti kugwiritsa ntchito hydroxypropyl methylcellulose yapakhomo kunawonjezeka pang'onopang'ono mpaka magulu onse a hydroxypropyl methylcellulose yapakhomo atalowa m'malo mwa hydroxypropyl methylcellulose yochokera kunja. Zizindikiro zazikulu monga kuyamwa kwa pulasitiki ndi kuchuluka kwa zinthu zomwe zimawoneka sizinasinthe kwambiri, zomwe zikusonyeza kuti hydroxypropyl methylcellulose yapakhomo yomwe yasankhidwa mu pepalali ikhoza kulowa m'malo mwa hydroxypropyl methylcellulose yochokera kunja yomwe ikupanga.

4 Mapeto

Kuyesa kwa nyumbahydroxypropyl methyl cellulosePa chipangizo choyesera chaching'ono cha 10 L chikuwonetsa kuti chili ndi kuthekera kosintha hydroxypropyl methyl cellulose yochokera kunja; zotsatira za mayeso osinthira kupanga zikuwonetsa kuti hydroxypropyl methyl cellulose yochokera mkati imagwiritsidwa ntchito popanga utomoni wa PVC, zizindikiro zazikulu za utomoni wa PVC womalizidwa ndi hydroxypropyl methyl cellulose yochokera kunja sizili ndi kusiyana kwakukulu. Pakadali pano, mtengo wa cellulose yochokera mkati pamsika ndi wotsika kuposa wa cellulose yochokera kunja. Chifukwa chake, ngati cellulose yochokera mkati ikugwiritsidwa ntchito popanga, mtengo wa kupanga ukhoza kuchepetsedwa kwambiri.