Kubwezeretsanso PE pelletizing, ndiyenera kuchita chiyani kuti ndithetse kusungunuka kosakhazikika?

1. Chiyerekezo cha Melt

Chizindikiro cha kusungunuka nthawi zambiri chimafotokozedwa m'mawu a MI ndipo tsopano chimadziwika padziko lonse lapansi kuti chiŵerengero cha kusungunuka kwa madzi, chomwe chimafotokozedwa ngati MFR.

Kawirikawiri imagwiritsidwa ntchito ngati chizindikiro cha kuwongolera bwino kwa ma resini a thermoplastic komanso momwe zinthu zimagwirira ntchito popanga zinthu pogwiritsa ntchito thermoplastic. Ndi kulemera kwa kusungunuka komwe kumadutsa mu capillary yokhazikika pa kutentha komwe kwatchulidwa komanso katundu wokhazikika, nthawi zambiri kumawonetsedwa mu g/10 mphindi. Chizindikiro cha kusungunuka ndi chizindikiro chomwe chimagwiritsidwa ntchito kusiyanitsa kusinthasintha kwa zinthu zosiyanasiyana za thermoplastic zomwe zili mumkhalidwe wawo wosungunuka.

Pa utomoni womwewo, chiŵerengero cha kusungunuka chingagwiritsidwe ntchito kuyerekeza kulemera kwake kwa mamolekyu ngati chowongolera khalidwe la kupanga.

Kawirikawiri, pa ma resin okhala ndi kapangidwe ka mankhwala enaake, a. kuchuluka kwa kusungunuka kwa chinthu kukakhala kochepa, kulemera kwa chinthu kumakulirakulira, mphamvu ya kusweka, kuuma, kulimba, kukhazikika kwa ukalamba ndi zinthu zina zimawonjezeka; b. pomwe kuchuluka kwa kusungunuka kwa chinthu ndi kwakukulu, kulemera kwa chinthu ndi kochepa, ndipo mphamvu ya kuyenda kwa chinthu imakhala yabwino kwambiri popanga.

Mapulasitiki obwezerezedwansoChifukwa cha zinyalala zambiri, kusakhazikika kwa chilengedwe, zomwe zimapangitsa kuti zinthuzo zikhale ndi zolakwika zambiri pambuyo poumba, zomwe zimakhudza khalidwe la mankhwala, momwe mungayang'anire kusungunuka kwa chala kuti chitulutse zinthu zabwino?

2. Kusungunuka kosiyanasiyana, kuyenera kusiyanitsa

1) Mitundu ya utomoni wa HDPE imapezeka mu jekeseni, blow molding, rotational molding ndi filimu, ndipo zizindikiro zawo zosungunuka zimasiyana.
a. HDPE yophikidwa ndi filimu imakhala ndi chala chosungunuka chaching'ono, nthawi zambiri pansi pa madigiri 2;
b. Chala chosungunuka cha jekeseni chidzakhala chachikulu kuposa 2 ndipo chingafike ngakhale makumi angapo.
Izi zimafuna kubwezeretsanso zinthu mosiyanasiyana, kugwiritsa ntchito zofunikira zosiyanasiyana pa chinthu chilichonse chomwe chakonzedwa.

3. Zipangizo za chala zosungunuka pang'ono zosakanikirana pamodzi

Choyamba, zobvomera zoumba zitha kubayidwa mwachindunji, pomwe zobvomera sizingagwiritsidwe ntchito popanga bvomera.
Njira yokhayo yosinthira HDPE yosungunuka kwambiri kukhala HDPE yosungunuka pang'ono ndikupeza njira yowonjezera kulemera kwa mamolekyulu, zomwe zimakhala zovuta kwambiri pongowonjezera kulemera kwa mamolekyulu, zomwe zimaphatikizapo mankhwala a polima ndipo zingakhale zovuta kwambiri kugwiritsa ntchito.
Yankho lokhalo losavuta lingakhale kugwiritsa ntchito zinthu za HDPE zokhala ndi index yotsika kuposa momwe zimafunikira ndikuzisakaniza mu gawo linalake ndi index yotsika ya HDPE yomwe ilipo, index yosungunuka yomwe ikuwoneka ngati ndiyo mtengo wapakati wa zinthu ziwiri zopangira.

4. Zomangira za polima

Pali chowonjezera chotchedwa melt finger conditioner, chomwe chimadziwikanso kuti polymeric binder.
Ndi mtundu wa chosinthira cha zinthu za polyolefin chomwe chapangidwa kuti chigwirizane ndi kapangidwe kabwino ka mamolekyu a zinthu za polyolefin. Chimaphatikiza bwino ma polima a polyolefin kudzera munjira zosiyanasiyana zolumikizirana, motero chimawonjezera kukopana pakati pa magawo a unyolo wa polima (monga mphamvu za van der Waals).

Njira yosinthirayi imabwezeretsa katundu wa zinthu za polyolefin zomwe zawonongeka pang'ono ku katundu wawo asanasweke, ndi kusintha kwakukulu kwa katundu payekha kutengera kuchuluka komwe kwawonjezeredwa.

Ntchito yake ndikusintha zotsatira za grafting ndi kuthana ndi zofooka za makina a compatibilizer komanso kusayenda bwino kwa madzi. POE ndi elastomer yaifupi yokhala ndi nthambi ya thermoplastic yokhala ndi kufalikira kwa molekyulu komwe kumapangidwa ndi DOW Chemical Company ku USA pogwiritsa ntchito metallocenes ngati ma catalyst, ndipo mawonekedwe ake akuluakulu ndi abwino kwambiri, monga mphamvu yokoka, mphamvu yong'ambika ndi mawonekedwe ena akuluakulu a makina amakula poyerekeza ndi zipangizo zachikhalidwe zotanuka.