Indawo yokunyibilika Polypropylene: iimpawu kunye neempawu

Polypropylene i Polymer thermoplastic of propene. Oku belungiselela iteknoloji ye polymerization of propylene usebenzisa ehlanganisa ngentsimbi. Ukuze ufumane izinto oku iparameters ezifana nezo apho avelisa polyethylene ezixineneyo.

Ngokuxhomekeke kuhlobo iza kusetyenziswa, unako ukufumana naluphi na uhlobo Polymer okanye imixube yalo. Ingongoma ukunyibilika ezinepolypropylene - yenye yeempawu ezibalulekileyo kulo mbandela. It has uhlobo ngumgubo ezimhlophe okanye granules, lexinene bulk apho kutshintshwe 0, 5 g / cm³. Umbandela ochazwe ukuze ezinemibala, okanye uncolored ngcono.

Ukucacisa: isakhiwo molecule

Kuba ezinepolypropylene ubume molecule yohlulwe iintlobo eziliqela, phakathi kwabo:

• isotactic;
• ataxic;
• syndiotactic.

izinto Stereoisomers bahluka neempawu zomzimba, mechanical kunye imichiza. Umzekelo, ezinepolypropylene atactic na uhlobo iirubber-ezifana eziphathekayo, nto leyo uphawu fluidity ophezulu. Ingongoma ukunyibilika ezinepolypropylene ngenxa extrusion kule meko malunga-80 ° C, lo gama loxinano uyakwazi ukufikelela kumgangatho we-850 kg / m³.

Le kaEtere diethyl umbandela iyachithakala kakuhle kakhulu. Ngeempawu ezinepolypropylene isotactic kwahlukile a modulus ochazwe ngasentla yaye ophezulu luthambe, ingxinano layo lifike 910 kg / m³, ngelixa lobushushu ukunyibilika i isusela ukusuka 165 ukuya-170 ° C. Xa olu hlobo ezinepolypropylene luphawulwa nokumelana ebalaseleyo imichiza.

iipropati komzimba mechanical

Namhlanje kuyinto eqhelekileyo kakhulu ukuba ukusebenzisa ezinepolypropylene. Ingongoma yokunyibilika kwale nto ezahlukeneyo ukusuka iintlobo ngamnye. Lidla kufanekiswa polyethylene, kodwa ezinepolypropylene ayikho mninzi omkhulu, kuba 0,91 g / cm³. Ngaphezu koko, Polypropylene kuba nzima kwaye iyamelana lingonakali, kwaye iyamelana kumaqondo obushushu.

Level Iqala ukuthambisa kwi-140 ° C, kanti amaqondo ukunyibilika i ifikelela 175 ° C. Nokumelana nokuqhekeka zokufunda ayengaseleki. Kuyinto zizinze mpilo kunye nokukhanya, nangona kunjalo, oku uvakalelo kuyehla ukuba ekwenzeni izinto ziya kongezelelwa ekwenziweni ezinepolypropylene.

Kwiindawo ezahlukeneyo kolu shishino isebenzisa iindidi ezininzi ezinepolypropylene namhlanje. Ingongoma yokunyibilika le nto esandisa ndawo isicelo. Zobude kwi baqhawula ipesenti nga zinokohluka ukusuka 200 ukuya 800%. Ukuvelisa amandla e kwempixano elingana umda we-250 ukuya 350 kgf / cm². amandla Impact ne notshi isusela ukusuka 33 ukuya 80 kgf · cm / cm², kanti yobulukhuni Brinell uphakathi 6 no 6.5 kgf / mm².

Iimpawu eziphambili imichiza

Ukuba uceba ukuthenga ezinye iimveliso ukusuka ezinepolypropylene, indawo ukunyibilika umbandela, kufuneka kwaziwe. Malunga naye kuxoxwa kweli nqaku. Kuwo ungakwazi ukufunda kunye nezinye iipropati imichiza. Ngokomzekelo, izinto nto iikhemikhali zozinzo organic izinyibilikisi kwaye iyaphuphuma kancinci kuphela. Ukuba ubushushu 100 ° C, izinto ezizizembiwa enuka kamnandi lichithakale. Kule meko ke umbuzo toluene kunye benzene.

Ngenxa yokuba le ezinepolypropylene iqulethe athom carbon tertiary, oko ayinyangeki mpilo phantsi kwempembelelo kwimitha yelanga kunye namaqondo eziphakamileyo. Oku kubangela umkhwa ukuba ukuguga xa kuthelekiswa polyethylene. Phantsi yempembelelo bume ndlongondlongo ezinepolypropylene akukho nzima njengoko polyethylene, ufakwa ng. Uyakwazi ukuba bangenele uvavanyo ukuze ngokuhlaziya nokuba phantsi koxinzelelo.

Ingongoma yokunyibilika lemibhobho ezinepolypropylene

Lidla inzala umthengi lobushushu ezinepolypropylene yokunyibilikisa mihla. into Imibhobho achaphazelekayo, ukuba uceba ukwenza nokuphucula inkqubo ubushushu. Xa baboniswa amaqondo-140 ° C, impahla uba ithambile yaye ngaloo ndlela ithe imilo yayo. Kanti ukuba ubushushu bavuselwa kumgangatho we-170 ° C, inyathelo yokunyibilikisa kwenzeka. Ngelo xesha uya kuyeka ukuba eqinileyo kwaye ungasakwazi ukugcina imilo kunye neenkcukacha.

iinkqubo zokufudumeza komgangatho lobushushu enjalo akukho ibalwa, ngoko ke inkqubo yonikezelo lwamanzi kwiityhubhu ezinepolypropylene ezifanelekileyo. Ngokuqhelekileyo, abenzi babanga ukuba iqondo lobushushu liphezulu kangangoko ngemibhobho ezinepolypropylene ngu 95 ° C. Mveliso ukumelana inqanaba amaqondo obushushu aphezulu, kodwa ngokufutshane. Ukuba welula ukusebenzisa umbhobho kubushushu omkhulu kwe-100 ° C, ubomi inkonzo yabo iza kuncipha.

Xa lobushushu lihla ezinepolypropylene ziya kwahluka ubukhulu. Xa itshiswe, oko kuya ukwandisa kunye okupholisa - nciphisa. Phantsi yempembelelo kwemibhobho eliphezulu lobushushu ukuze uqale SAG yesifundo phakathi izibophelelo kwaye umaleko ongaphandle, uya kuqaphela ukudumba.

Bokuqonda sebenzisa wesizalo ezinepolypropylene

Ukufunwa nazo kusetyenziswa izinto ezinepolypropylene. Ingongoma yokunyibilika lemibhobho ezinjalo inokuba nomahluko. Oku kufuneka kuqwalaselwe ukuba imveliso phambi kwakho PN20 kraca. Kule meko ke umbhobho, amaqondo obushushu ukusebenza yazo 60 ° C. Kodwa xa kufikwa imveliso PN25, oko kubonisa ukuba iya kuba nako ukumelana amaqondo ukuya ku-95 ° C.

isiphelo

Ecolekileyo ikhuselekile ukuba bathi umsi itywina ezinepolypropylene ogunyazisiweyo kufuphi kwimigodi. Ingongoma yokunyibilika le ezinepolypropylene, Noko ke, oku akubonisi ukuba umbhobho kufuneka bakhuselwe. Iingcali bacebisa ukuthenga ngakumbi iimveliso, ezo ngaphantsi basengozini deformation kwiqondo lobushushu eliphezulu. Ngoko ke, imibhobho kufuneka ngerabha kwaye ikhuselwe Ukongezelela babe umaleko engaphakathi aluminiyam okanye fiberglass. Oku ikhusela umbhobho evela ukwanda ixesha elide inkonzo yabo.