Pakupanga pulasitiki zopangira pulasitiki, chimodzi kapena zingapo mwa izi zimachitika nthawi zambiri, monga rheology ya ma polima ndi kusintha kwa thupi ndi mankhwala, zomwe nthawi zambiri zimadziwika ndi izi:
1. Fluidity: Thermoplastics fluidity imatha kudziwika kuchokera kumagulu angapo monga kulemera kwa molekyulu, melt index, Archimedes spiral flow length, mawonekedwe a viscosity ndi ma flow ratio (process kutalika / pulasitiki makulidwe a khoma).santhula.
2. Crystallinity: Chomwe chimatchedwa crystallization phenomenon chimatanthawuza chodabwitsa kuti mamolekyu apulasitiki amasintha kuchoka kumayendedwe aulere ndikusokonekera kwathunthu kupita ku mamolekyu amasiya kuyenda kwaufulu ndipo amakonzedwa pamalo okhazikika pang'ono kuti apange mawonekedwe owonetsera mamolekyulu kuchokera ku chosungunuka. perekani ku condensation.
3. Kutentha kwa kutentha: Kumva kutentha kumatanthauza kuti mapulasitiki ena amatha kumva kutentha.Pamene nthawi yotentha imakhala yaitali pa kutentha kwakukulu kapena kumeta ubweya ndi kwakukulu, kutentha kwa zinthu kumawonjezeka ndipo kumakhala kosavuta kutayika ndi kuwonongeka.Mapulasitiki osamva kutentha akawonongeka, zinthu monga ma monomers, mpweya, ndi zolimba zimapangidwa.Makamaka, mpweya wina wovunda umakwiyitsa, wowononga kapena wowopsa m'thupi la munthu, zida, ndi nkhungu.
4. Easy hydrolysis: Ngakhale mapulasitiki ena atakhala ndi madzi ochepa, amawola ndi kutentha kwambiri, kuthamanga kwambiri, ndipo katunduyu amatchedwa easy hydrolysis.Mapulasitiki awa (monga polycarbonate) ayenera kutenthedwa ndi kuuma
5. Kupsinjika maganizo: Mapulasitiki ena amakhudzidwa ndi kupsinjika maganizo, ndipo amatha kupanikizika mkati mwa kuumba, komwe kumakhala kosavuta komanso kosavuta kusweka, kapena zigawo za pulasitiki zimasweka pansi pa mphamvu ya kunja kapena zosungunulira.Chodabwitsa ichi chimatchedwa stress cracking.
6. Sungunulani fracture: Polima amasungunuka ndi kuthamanga kwina kwake amadutsa pabowo la nozzle pa kutentha kosasintha.Pamene kuchuluka kwa kuthamanga kumadutsa mtengo wina, ming'alu yowoneka bwino imachitika pamtunda wosungunuka, womwe umatchedwa kusungunuka kwa fracture.Pamene kusungunuka kwa madzi kumasankhidwa Popanga zipangizo zapulasitiki zapamwamba, ma nozzles, othamanga, ndi madoko a chakudya ayenera kukulitsidwa kuti achepetse kuthamanga kwa jekeseni ndi kupanikizika, ndikuwonjezera kutentha kwa zinthu.
Maumboni
[1] Zhong Shuheng.Kupanga Kwamitundu.Beijing: China Art Publishing House, 1994.
[2] Song Zhuoyi et al.Pulasitiki zopangira ndi zowonjezera.Beijing: Science and Technology Literature Publishing House, 2006.
[3] Wu Lifeng et al.Masterbatch User Manual.Beijing: Chemical Industry Press, 2011.
[4] Yu Wenjie et al.Zowonjezera Pulasitiki ndi Ukadaulo Wopanga Zopanga.3rd Edition.Beijing: Chemical Viwanda Press, 2010.
[5] Wu Lifeng.Pulasitiki Coling Formulation Design.2nd Edition.Beijing: Chemical Viwanda Press, 2009
Nthawi yotumiza: Jun-18-2022