Polypropylene - Melting lobushushu, iimpawu kunye neempawu

Polypropylene ukuba indawo yokunyibilika ekufuneka makwazeke kuni ukuba ufuna ukusebenzisa izinto ukulungiselela iinjongo zakho, ngaba non-polar Polymer thermoplastic zokwenziwa lalo iklasi ka polyolefins.

ukuba irekhodi

Enye ezinepolypropylene eyaziwa ngokuba imveliso ye propylene polymerization. Le nto emhlophe ngebala kwaye isakhiwo esiqinileyo. Oku eziqulunqwe polymerization of propylene. Polymerization lwenziwa phantsi kwempembelelo xi umoya 10, ubushushu igcinwe ngaphakathi 80 ° C.

isakhiwo eziphilayo nendawo yokunyibilika

Polypropylene, indawo ukunyibilika kwayo kuya kuthiwa ngezantsi, uhlobo lwesakhiwo lwalusanda yohlulwe ngokwendidi ezintathu:

• atactic;
• syndiotactic;
• isotactic.

ezinepolypropylene Atactic - material rubber-njengokuthi unezinga eliphezulu fluidity. Indawo yayo yokunyibilika 80 ° C, lo gama i-konga 850 kg / m³. Le nto linophawu a ukunyibilika aphezulu diethyl kaEtere.

It uyahluka iimpawu zayo ukusuka ezinepolypropylene isotactic ezichazwe ngasentla ukuba ine modulus ophezulu luthambe, ingxinano yayo ifikelela kwi 910 g / m³, kanti kwindawo yokunyibilika iphezulu kakhulu kwaye isusela ukusuka 165 ukuya-170 ° C. Le nto iyamelana imichiza.

iipropati Physico-mechanical kunye nokubalulwa

Polypropylene ukuba indawo yokunyibilika bekutshiwo ngasentla, yahlukile ukusuka density lexinene ephantsi, nto leyo 0,91 g / cm³. Eli xabiso kuqhelekile ukuba iiplastiki. Wachaza izinto ngakumbi aqinileyo ngakumbi, oko kuboniswa ukuba siyakwazi ukumelana eliphezulu ukuya lingonakali.

Phakathi kwezinye izinto, ezinepolypropylene, ubushushu ezingatshiyo, kuba uqala ukuthambisa xa amaqondo obushushu ifikelela 140 ° C. Iqondo lobushushu yokunyibilika yi-175 ° C, ngaphezu koko, umbandela kakhulu lakufumana xi umhlwa ng. Le ezinepolypropylene ukukhanya ukumelana mpilo. Intshayelelo somfanekiso lihlisa ubuntununtunu ngakumbi.

Polypropylene ukuba indawo yokunyibilika unokuba nomdla, ukuba uceba ukusebenzisa le nto, xa wolula izakuziphatha ngokwahlukileyo ngokuxhomekeke lobushushu kunye isicelo umthwalo isantya. I esezantsi isantya ndisolulela, kokukhona ixabiso lepropati mechanical. Uqine xi ngokwaphula iyahluka ukusuka 250 ukuya 400 kgf / cm², ngoxa zobude ngexesha lekhefu sivela 200 ukuya 800%.

Ingongoma ukunyibilika kwiphepha ezinepolypropylene, esele ikhankanywe apha ngasentla, asiyiyo iimpawu abaxhasi zabucala abanomdla kuphela. ngamanye amaxesha abantu abachaphazelekayo modulus ngakumbi flexural. Kwimeko langoku ingahluka ukususela 6700 ukuya 11900 kgf. Xa isivuno indawo zobude kulingana 10-20%. amandla Impact ne notshi yi 33-80 kgf cm / cm². Brinell yobulukhuni yi 6-6.5 kg / mm².

enkulu isicelo

Ukusetyenziswa ezinepolypropylene kabanzi. Le nkcazelo isetyenziselwa ukwenza iifilimu apha ziquka iintlobo ukuphakheja. Phakathi kwezinye izinto kuyimfuneko ukuba anikezele:

• amasaka;
• imibhobho;
• iikomityi zeplastikhi;
• ukuphakheja;
• iinkcukacha yezixhobo zobugcisa;
• impahla;
• izinto zokwambathisa ezikhoyo;
• non-ephothiweyo ilaphu.

Xa kwakusakhiwa ezinepolypropylene lukwafumanise indlela yayo, kukho sisetyenziselwa ntoni lokungcangcazela bodwa ingxolo imigangatho, kuquka kwiinkqubo ukuba ii-kwiteknoloji "ezidadayo floor". Xa ezinepolypropylene sele copolymerized kunye ethylene, ibe copolymer non-crystallizable ifunyenwe. Kunokuba ukubonisa iimpawu irabha, enokumelana ukuba ukwaluphala enokumelana eliphezulu chemical.

Kuba ubushushu, ukungcangcazela lisetyenziswa ezinepolypropylene eYandisiweyo. Iqondo lobushushu inyibilikiswa wetshati ezinepolypropylene bekutshiwo ngasentla, nangona kunjalo, oku na iimpawu kuphela ukuba ufanele ube nomdla phambi kokuba uthenge imveliso kulo mbandela. Kufuneka wazi ukuba ezinepolypropylene eyandisiweyo ayafana kakhulu iipropati ukuya amagwebu polyethylene. Ke EPS singavalwa umfanekiso extrusion yokuhombisa ezinepolypropylene eyandisiweyo. Kuba kokuvala, Ipeyinti indlela, yokuncamathelisa zokwakha, mastics kunye neebhanyabhanya ezincangathi asetyenziswa rhoqo ezinepolypropylene atactic. Ububanzi ezinepolypropylene eRussia ngolu hlobo lulandelayo:

• 38% - izikhongozeli;
• 30% - sakhe;
• 18% - film;
• 6% - imibhobho;
• 5% - ezinepolypropylene sheets;
• 3% - Okunye.

Ingongoma yokunyibilika lemibhobho ezinepolypropylene

Ingongoma yokunyibilika lemibhobho ezinepolypropylene - yenye yezo mpawu, nto leyo amaninzi unomdla esetyenziswayo. Le nto iqala ukuthambisa kwi-140 ° C ngelixa baphele - 175 ° C. Le ndlela yokugqibela - kodwa iqondo lobushushu zomphunga utshisayo. Xa siqwalasela eli nani, lo ezinepolypropylene zingasetyenziswa nayiphi na inkqubo yonikezelo lwamanzi apho amanzi ihanjiswa kunye lobushushu lokungavinjwa phezulu.

Kodwa izinto akukho zilula kakhulu kulo mbandela. Le ductility lisebenza aseluphawu eyongezelelweyo mbandela. Polypropylene ngethuba lokuphumla ine zobude leyo kuyahlukana ngaphakathi uluhlu 200 ukuya 800%. Oku kubonisa ukuba xa umbhobho uya kuchaphazeleka yi ubunzima elithile, ngoko ke imveliso iya kwandiswa ibe elide, waza ke sicinywa.

Elokuphetha: uhlobo ezinepolypropylene

Iimpawu ezinepolypropylene, iimpawu kunye nohlobo le mathiriyeli iya kuzakuvumela uku bana phandle ndawo ingcono ukuyisebenzisa. ezinepolypropylene Isotactic ngoku ithathwa njengokuba uthandwayo kwishishini. Oku kungenxa iimpawu zonke izinto eziphathekayo, imeko eyodwa apho amaqela ebezingalindelekanga CH3, ibekwe engaqhelekanga ngokumalunga kwikhonkco engundoqo. Ezo sphere iimpawu eziphambili ezichazwe kufuneka yabelwe phakathi kwabo: ukukwazi ukugcina ukwakheka kwalo kwiqondo lobushushu eliphezulu, ngokuba lukhuni kunye namandla eliphezulu.