Kugwiritsa ntchito hydroxypropyl methylcellulose kupanga PVC

Mawu ofunika: hydroxypropyl methyl cellulose; PVC yokhala ndi digiri yapamwamba ya polymerization; kuyesa kochepa; polymerization; kukhazikika.

Kugwiritsa ntchito China hydroxypropyl methylcellulosem'malo kunja wina kupanga PVC ndi mkulu polymerization digiri unayambitsidwa. Zotsatira za mitundu iwiri ya hydroxypropyl methylcellulose pazabwino za PVC yokhala ndi digiri yapamwamba ya polymerization zidafufuzidwa. Zotsatira zake zidawonetsa kuti zinali zotheka kulowetsa m'malo mwa hydroxypropyl methyl cellulose m'malo otumizidwa kunja.

High-degree-of-polymerization PVC resins amatanthawuza ma resin a PVC okhala ndi digiri ya polymerization yopitilira 1,700 kapena mawonekedwe olumikizana pang'ono pakati pa mamolekyu. Poyerekeza ndi utomoni wamba PVC, mkulu-polymerization PVC utomoni ali kulimba mkulu, yaing'ono psinjika seti, kukana wabwino kutentha, kukana kukalamba, kukana kutopa ndi kuvala kukana. Ndiwolowa m'malo mwa mphira wabwino ndipo chitha kugwiritsidwa ntchito posindikiza zingwe zamagalimoto, waya ndi chingwe, ma catheters azachipatala, ndi zina zambiri.

Kupanga njira ya PVC ndi digiri yapamwamba ya polymerization makamaka kuyimitsidwa polymerization. Popanga njira yoyimitsidwa, dispersant ndi chinthu chofunikira chothandizira, ndipo mtundu wake ndi kuchuluka kwake kumakhudza mwachindunji mawonekedwe a tinthu, kugawa kwa tinthu, ndi kuyamwa kwapulasitiki kwa utomoni wa PVC. Njira zobalalitsira zomwe zimagwiritsidwa ntchito kwambiri ndi ma polyvinyl mowa ndi ma hydroxypropyl methylcellulose ndi ma polyvinyl alcohol composite composite system, ndipo opanga m'nyumba nthawi zambiri amagwiritsa ntchito zomalizazi.

1 Main zopangira ndi specifications

Zida zazikulu zomwe zimagwiritsidwa ntchito poyesa zikuwonetsedwa mu Table 1. Zitha kuwoneka kuchokera ku Table 1 kuti hydroxypropyl methylcellulose yapakhomo yosankhidwa mu pepala ili ikugwirizana ndi hydroxypropyl methylcellulose yochokera kunja, yomwe imapereka chofunikira kuti chiyesedwe cholowa m'malo mwa ichi. pepala.

2 Zinthu zoyesa

2. 1 Kukonzekera kwa hydroxypropyl methylcellulose solution

Tengani madzi enaake opangidwa ndi deionized, ikani mu chidebe ndikutenthetsa mpaka 70 ° C, ndipo pang'onopang'ono yonjezerani hydroxypropyl methylcellulose pansi pa kusonkhezera kosalekeza. Ma cellulose amayandama pamadzi poyamba, kenako amamwazikana mpaka atasakanikirana. Kuziziritsa njira voliyumu.

Table 1 Main zopangira ndi mafotokozedwe awo

2. 2 Njira yoyesera

Pa chipangizo chaching'ono choyesera cha 10 L, gwiritsani ntchito hydroxypropyl methylcellulose yochokera kunja kuti muyese mayeso a benchmark kuti mudziwe chilinganizo choyambirira cha mayeso ang'onoang'ono; gwiritsani ntchito hydroxypropyl methylcellulose m'malo mwa hydroxypropyl methylcellulose yochokera kunja kuti ayesere; Zopangidwa ndi utomoni wa PVC zopangidwa ndi hydroxypropyl methylcellulose zinafaniziridwa, ndipo kuthekera kolowa m'malo mwa hydroxypropyl methylcellulose adaphunziridwa. Malingana ndi zotsatira za mayeso ang'onoang'ono, kuyesa kwa kupanga kumachitika.

2. 3 Njira zoyesera

Pamaso zimene, kuyeretsa polymerization ketulo, kutseka pansi valavu, kuwonjezera ena kuchuluka kwa desalinated madzi, ndiyeno kuwonjezera dispersant; kutseka ketulo chivundikirocho, vacuumize atadutsa nayitrogeni kuthamanga mayeso, ndiyeno kuwonjezera vinilu kolorayidi monoma; mutatha kuzizira kozizira, onjezerani woyambitsa; Gwiritsani ntchito madzi ozungulira kuti muwonjezere kutentha mu ketulo kuti mufike kutentha, ndikuwonjezera yankho la ammonium bicarbonate panthawi yake panthawiyi kuti musinthe pH ya machitidwe; pamene kupanikizika kumatsikira ku mphamvu yomwe yatchulidwa mu ndondomekoyi, onjezerani choyimira ndi defoamer, ndikumasula yankho. Chomalizidwa cha PVC utomoni anapezedwa ndi centrifugation ndi kuyanika, ndi chitsanzo kusanthula.

2. 4 Njira zowunikira

Malinga ndi njira zoyeserera zamabizinesi, nambala ya viscosity, kachulukidwe, zinthu zosakhazikika (kuphatikiza madzi) ndi kuyamwa kwa pulasitiki kwa 100 g PVC utomoni womalizidwa wa PVC utomoni adayesedwa ndikuwunikidwa; Wapakati tinthu kukula kwa PVC utomoni anayesedwa; morphology ya PVC utomoni particles anaonedwa pogwiritsa ntchito sikani electron maikulosikopu.

3 Zotsatira ndi Zokambirana

3. 1 Kuyerekeza kusanthula kwamagulu osiyanasiyana a utomoni wa PVC mu polymerization yaing'ono

Dinani 2. Malingana ndi njira yoyesera yomwe yafotokozedwa mu 4, gulu lililonse laling'ono lomaliza la PVC resin linayesedwa, ndipo zotsatira zake zikuwonetsedwa mu Table 2.

Zotsatira za tebulo 2 zamagulu osiyanasiyana a mayeso ang'onoang'ono

Zitha kuwonedwa kuchokera ku Table 2: Kuchulukana kowonekera, nambala ya viscosity ndi kuyamwa kwa plasticizer kwa utomoni wa PVC wopezedwa ali pafupi kwambiri pogwiritsa ntchito mapadi osiyanasiyana poyesa pang'ono; utomoni mankhwala anapezedwa ntchito zoweta hydroxypropyl methylcellulose chilinganizo Ambiri tinthu kukula ndi ang'onoang'ono.

Chithunzi 1 chikuwonetsa zithunzi za SEM za zinthu za PVC resin zopezedwa pogwiritsa ntchito hydroxypropyl methylcellulose.

(1)—Kuchokera kunja hydroxypropyl methylcellulose

(2)—Domestic hydroxypropyl methylcellulose

Chith. 1 SEM ya utomoni wopangidwa mu 10-L polymerizer pamaso pa hydroxypropyl methyl cellulose

Zitha kuwoneka kuchokera pa Chithunzi 1 kuti mawonekedwe a pamwamba a PVC resin particles opangidwa ndi ma dispersants osiyanasiyana a cellulose ndi ofanana.

Pomaliza, zitha kuwoneka kuti hydroxypropyl methylcellulose yapakhomo yoyesedwa mu pepalali ili ndi kuthekera kolowa m'malo mwa hydroxypropyl methylcellulose.

3. 2 Kuyerekeza kusanthula khalidwe la PVC utomoni ndi mkulu polymerization digiri mu kupanga mayeso

Chifukwa cha kukwera mtengo komanso chiwopsezo cha mayeso opangira, njira yosinthira ya mayeso ang'onoang'ono sangathe kugwiritsidwa ntchito mwachindunji, chifukwa chake dongosololi ndikuwonjezera pang'onopang'ono kuchuluka kwa hydroxypropyl methylcellulose m'chilinganizo. Zotsatira za mayeso a gulu lililonse zikuwonetsedwa mu Table 3 yowonetsedwa.

Gulu 3 Zotsatira zoyesa zamagulu osiyanasiyana opanga

Zitha kuwoneka kuchokera pa Table 3 kuti kugwiritsidwa ntchito kwa hydroxypropyl methyl cellulose kumakulitsidwa pang'onopang'ono mpaka hydroxypropyl methyl cellulose ilowa m'malo mwa hydroxypropyl methyl cellulose. Zizindikiro zazikulu monga mayamwidwe a plasticizer ndi kachulukidwe kowoneka bwino sizinasinthe kwambiri, kuwonetsa kuti hydroxypropyl methylcellulose yapakhomo yomwe yasankhidwa mu pepalali ingalowe m'malo mwa hydroxypropyl methylcellulose yomwe idatumizidwa kunja.

4 Mapeto

Mayeso a m'nyumba ya hydroxypropyl methyl cellulose pa kachipangizo kakang'ono ka 10 L akuwonetsa kuti ali ndi kuthekera kolowa m'malo mwa hydroxypropyl methyl cellulose; Zotsatira za mayeso olowa m'malo akuwonetsa kuti hydroxypropyl methyl cellulose imagwiritsidwa ntchito popanga utomoni wa PVC, zisonyezo zazikulu za utomoni wa PVC womaliza ndi cellulose ya hydroxypropyl methyl yochokera kunja alibe kusiyana kwakukulu. Pakalipano, mtengo wa cellulose wapakhomo pamsika ndi wotsika kuposa wa cellulose wotumizidwa kunja. Chifukwa chake, ngati cellulose yapakhomo imagwiritsidwa ntchito popanga, mtengo wazinthu zothandizira kupanga ukhoza kuchepetsedwa kwambiri.