Zakuthupi Ndi Zamankhwala a Polyethylene Resin

Zakuthupi Ndi Zamankhwala a Polyethylene Resin

Zakuthupi Ndi Zamankhwala a Polyethylene Resin

Zakudya Zamakono

Polyethylene imakhala ndi kukhazikika kwamankhwala abwino ndipo imalimbana ndi kusungunuka kwa nitric acid, kuchepetsa sulfuric acid ndi hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia madzi, amines, hydrogen peroxide, sodium hydroxide, potaziyamu hydroxide, ndi zina zambiri. yankho. Koma si kugonjetsedwa ndi amphamvu oxidative dzimbiri, monga fuming sulfuric acid, anaikira nitric asidi, chromic asidi ndi sulfuric acid osakaniza. Pa kutentha kwa chipinda, zosungunulira zomwe tatchulazi zidzasokoneza pang'onopang'ono polyethylene, pamene pa 90-100 ° C, sulfuric acid yambiri ndi nitric acid yokhazikika idzawononga kwambiri polyethylene, kuchititsa kuti iwonongeke kapena kuwonongeka. Polyethylene ndiyosavuta kukhala ndi okosijeni wazithunzi, wothira okosijeni, wowola ndi ozoni, komanso kuonongeka mosavuta pochita cheza cha ultraviolet. Mpweya wakuda uli ndi chitetezo chabwino kwambiri chotchinjiriza pa polyethylene. Zochita monga kuwoloka, chain scission, ndi kupanga magulu a unsaturated akhoza kuchitika pambuyo pa kuyatsa.

mawotchi katundu

The makina zimatha polyethylene ndi jiniral, mphamvu yamanjenje ndiyotsika, kukana kukwawa sikwabwino, komanso kukana kwamphamvu ndikwabwino. Impact mphamvu LDPE>LLDPE>HDPE, ena makina katundu LDPE crystallinity ndi wachibale maselo kulemera, ndi kusintha kwa zizindikiro izi, mawotchi katundu wake kuwonjezeka. Environmental stress akulimbana kukana si zabwino, koma pamene wachibale molekyulu kulemera ukuwonjezeka, izo bwino. Kukana kwabwino koboola, komwe LLDPE ndi yabwino kwambiri.

Makhalidwe a chilengedwe

Polyethylene ndi polymer ya alkane inert yokhala ndi kukhazikika kwamankhwala. Imagonjetsedwa ndi dzimbiri ndi asidi, alkali ndi mchere wamadzimadzi amadzimadzi kutentha kwa firiji, koma osagonjetsedwa ndi zowonjezera zowonjezera monga oleum, nitric acid ndi chromic acid. Polyethylene ndi insoluble mu zosungunulira wamba pansi 60 ° C, koma adzatupa kapena osokoneza kwa nthawi yaitali kukhudzana ndi aliphatic hydrocarbons, onunkhira hydrocarbons, halogenated hydrocarbons, etc. Pamene kutentha kuposa 60 ℃, akhoza kusungunuka pang'ono mu toluene. , amyl acetate, trichlorethylene, turpentine, mineral mafuta ndi parafini; pamene kutentha ndi apamwamba kuposa 100 ℃, akhoza kusungunuka mu tetralmu.

Popeza kuti mamolekyu a polyethylene ali ndi zomangira zazing'ono ziwiri ndi ma ether, kuwala kwa dzuwa ndi mvula kumayambitsa ukalamba, zomwe ziyenera kukonzedwa bwino powonjezera ma antioxidants ndi zolimbitsa thupi.

Processing makhalidwe

Chifukwa LDPE ndi HDPE zili ndi madzi abwino, kutentha kwapakati, kutentha kwapakati, kukhuthala kwapakati, kutentha kwapang'onopang'ono, ndipo siziwola pa kutentha kwakukulu kwa 300 ℃ mu gasi wa inert, ndi mapulasitiki okhala ndi ntchito yabwino yokonza. Komabe, kukhuthala kwa LLDPE ndikokwera pang'ono, ndipo mphamvu yamagalimoto iyenera kuonjezedwa ndi 20% mpaka 30%; zimakhala zosavuta kusungunula fracture, kotero ndikofunikira kuwonjezera kusiyana kwa kufa ndikuwonjezera zothandizira kukonza; kutentha kwa processing ndikokwera pang'ono, mpaka 200 mpaka 215 °C. Polyethylene imakhala ndi mayamwidwe amadzi otsika ndipo safuna kuyanika musanayambe kukonza.

Kusungunuka kwa polyethylene ndi madzi osakhala a Newtonian, ndipo kukhuthala kwake kumasintha pang'ono ndi kutentha, koma kumachepa mofulumira ndi kuwonjezeka kwa kumeta ubweya wa ubweya ndipo kumakhala ndi ubale wozungulira, womwe LLDPE imakhala yochepa kwambiri.

Zogulitsa za polyethylene ndizosavuta kuwunikira panthawi yozizira, chifukwa chake, kutentha kwa nkhungu kuyenera kuperekedwa pakukonza. Pofuna kulamulira crystallinity wa mankhwala, kotero kuti ali osiyana katundu. Polyethylene ili ndi shrinkage yayikulu, yomwe iyenera kuganiziridwa popanga nkhungu.

Zakuthupi Ndi Zamankhwala a Polyethylene Resin

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