Okay, cia peb piav qhia meej txog lub hauv paus ntsiab lus ntawm kev hloov kho elastomer los txhim kho qhov tawv ntawmspunbond nonwoven ntaub. Qhov no yog ib qho piv txwv ntawm kev ua tiav kev ua tau zoo los ntawm "ua kom muaj zog thiab txo qis qis" los ntawm cov khoom sib xyaw.
Cov ntsiab lus tseem ceeb: Toughness vs. Brittleness
Ua ntej, cia peb nkag siab "toughness." Toughness yog cov khoom muaj peev xwm nqus tau lub zog thiab ua rau cov yas deformation kom txog thaum nws tawg hauv kev ntxhov siab. Cov khoom siv nrog zoo toughness yog ob qho tib si muaj zog thiab ua haujlwm zoo, yuav tsum tau ua haujlwm ntau heev kom tawg.
Cov ntaub ntawv brittle (xws li unmodified polypropylene): Nyob rau hauv sab nraud quab yuam, cov molecular chains tsis muaj sij hawm los rearrange, kev nyuaj siab concentrates ntawm qhov tsis xws luag, ncaj qha mus rau tawg sai thiab tsis elongation ntawm tawg.
Cov ntaub ntawv tawv: Raws li sab nraud quab yuam, lawv tuaj yeem tawm los thiab ua rau cov yas deformation, siv ntau lub zog hauv cov txheej txheem, yog li tiv thaiv kev puas tsuaj.
Lub hom phiaj tseem ceeb ntawm kev hloov kho elastomer yog hloov pauv ib nrab-crystalline polymers zoo li polypropylene los ntawm kev coj tus cwj pwm tawg mus rau kev coj tus cwj pwm tawg.
Cov ntsiab lus ntxaws ntawm Elastomer Hloov Kho
Lub hauv paus ntsiab lus tuaj yeem nkag siab los ntawm ob qho tib si microscopic thiab macroscopic theem. Lub hauv paus yog nyob rau hauv elastomer hais ua raws li kev ntxhov siab concentration ntsiab lus thiab lub zog absorbers.
1. Microscopic Mechanical Mechanism: Induction thiab Termination of Crazing, Txhawb nqa Shear Yield
Qhov no yog lub hauv paus ntsiab lus tseem ceeb tshaj plaws. Thaum spunbond ntaub raug rau sab nraud quab yuam (xws li tearing lossis cuam tshuam), cov txheej txheem hauv qab no tshwm sim hauv:
a) Stress Concentration thiab Crazing Initiation
Elastomers (xws li EPDM, POE) feem ntau tsis sib xws los yog ib feem ntawm cov polypropylene matrix. Yog li ntawd, tom qab sib tov, lawv raug faib raws li me me, dispersed "kob" qauv nyob rau hauv ib tug nruam polypropylene "hiav txwv" theem.
Txij li thaum lub modulus ntawm lub elastomer yog tsawg dua li ntawm polypropylene, ib tug loj kev nyuaj siab concentration tshwm sim nyob rau hauv lub interface ntawm ob theem thaum raug rau sab nraud quab yuam.
Cov ntsiab lus kev ntxhov siab no dhau los ua cov ntsiab lus pib rau crazing. Crazing tsis yog tawg, tab sis theej microporous fiber ntau pob qauv perpendicular mus rau kev ntxhov siab, tseem txuas nrog sab hauv los ntawm polymer fibers. Qhov tsim ntawm crazing absorbs ib tug loj npaum li cas ntawm lub zog.
b) Crazing Termination thiab Shear Band Tsim
Qhov thib ob lub luag haujlwm tseem ceeb ntawm elastomer hais yog txhawm rau tshem tawm cov crazing. Thaum crazing ntsib cov elastomer saj zawg zog hais thaum lub sij hawm nws propagation, lub siab ntxhov siab teb ntawm nws lub ntsis yog blunted, tiv thaiv lub crazing los ntawm kev loj hlob mus rau hauv tuag macroscopic kab nrib pleb.
Nyob rau tib lub sijhawm, kev ntxhov siab kuj tseem ua rau cov shear yielding hauv polypropylene matrix. Qhov no yog hais txog tus txheeb ze slippage thiab reorientation ntawm polypropylene molecular chains nyob rau hauv shear stress, tsim shear bands; Cov txheej txheem no kuj yuav tsum muaj lub zog loj.
c) Synergistic Energy Dissipation Mechanism
Thaum kawg, lub zog siv sab nraud yog dissipated feem ntau los ntawm cov hauv qab no:
Tsim ntau crazing: zog noj.
Deformation thiab tawg ntawm elastomer hais lawv tus kheej: kev siv zog.
Shear yielding ntawm matrix: zog noj.
Interfacial debonding: cov elastomer hais tawm los ntawm matrix, kev siv zog.
Cov txheej txheem no ua rau muaj kev ua haujlwm ntau ntxiv rau cov khoom siv tawg, macroscopically manifested raws li ib qho kev txhim kho tseem ceeb hauv kev cuam tshuam lub zog thiab tsim kua muag, thaum tseem ua kom elongation ntawm tawg.
2. Phase Structure Hloov: cuam tshuam rau crystallization cwj pwm
Qhov sib ntxiv ntawm elastomers tsis tsuas yog ua raws li lub cev "additive" tab sis kuj cuam tshuam rau microstructure ntawm polypropylene.
Refining Spherulites: Elastomer hais tuaj yeem ua raws li qhov chaw nucleation heterogeneous, cuam tshuam qhov kev npaj ntawm polypropylene molecular chains thiab ua rau lawv crystallize rau hauv finer, denser spherulite lug.
Txhim kho qhov Interface: Los ntawm kev siv cov compatibilizers, qhov sib txuas ntawm qhov sib txuas ntawm elastomer thiab polypropylene matrix tuaj yeem txhim kho, kom ntseeg tau tias kev ntxhov siab tuaj yeem hloov tau zoo los ntawm matrix mus rau elastomer hais, yog li ua tau zoo dua inducing crazes thiab shear banding.
Daim ntawv thov tshwj xeeb hauv Spunbond Nonwoven Fabric Production
Kev siv cov ntsiab lus saum toj no rau kev tsim cov spunbond nonwoven fabrics muaj cov teebmeem hauv qab no:
Enhanced toughness ntawm tus kheej fibers:
Thaum lub sij hawm spinning, polypropylene yaj uas muaj elastomers yog stretched rau hauv fibers. Hloov cov fibers lawv tus kheej ua nyuaj. Raws li kev quab yuam sab nraud, cov fibers tsis tshua muaj kev puas tsuaj thiab tuaj yeem ua rau cov yas deformation ntau dua, absorbing ntau zog.
Strengthening thiab Toughening ntawm Fiber Network Structure:
Thaum lub sij hawm kub dov qhov cuab lub zog, cov fibers fuse ntawm qhov dov taw tes. Fibers nrog zoo toughness yog tsawg dua yuav tawg tam sim ntawd ntawm dov taw tes thaum raug rau tearing rog.
Cov rog sab nraud tuaj yeem rov faib tau zoo dua thoob plaws hauv lub network fiber ntau. Thaum cov fiber ntau raug kev ntxhov siab, nws tuaj yeem hloov qhov kev ntxhov siab mus rau ib puag ncig fibers los ntawm deformation, tiv thaiv tsis ua haujlwm sai los ntawm kev ntxhov siab.
Ib tug leap rau pem hauv ntej kua muag thiab puncture kuj:
Tear resistance: Tearing yog txheej txheem ntawm kev tawg tawm. Elastomer hais tau zoo pib thiab tshem tawm ntau cov microcracks, tiv thaiv lawv los ntawm coalescing rau hauv macroscopic kab nrib pleb, zoo heev slowing down txheej txheem tearing.
Puncture resistance: Puncture yog ib qho kev sib xyaw ua ke ntawm kev cuam tshuam thiab tearing. Cov ntaub ntawv muaj zog tuaj yeem ua rau muaj kev tawm tsam ntau thiab deformation thaum cov khoom txawv teb chaws tho, encapsulating cov khoom tho es tsis txhob raug punctured ncaj qha.
Xaus
Cov ntsiab lus: Lub hauv paus ntsiab lus ntawm kev hloov kho elastomer los txhim kho lub zog ntawm spunbond nonwovens yog qhov tseem ceeb los ua ke cov tawv tawv tab sis nkig polypropylene matrix nrog cov roj hmab muag muag, ua kom muaj zog txaus hauv cov khoom siv.
Los ntawm inducing crazing, tshem tawm cov kab nrib pleb, thiab txhawb shear yielding los ntawm microscopic mechanical mechanisms, lub zog puas (kev cuam tshuam, tearing) siv sab nraud yog hloov mus rau hauv ib qho loj me me, tsis muaj kev puas tsuaj rau kev ua haujlwm. Qhov no macroscopically txhim kho cov khoom siv cuam tshuam, tsim kua muag ua haujlwm, thiab elongation ntawm kev tawg, hloov spunbond nonwoven npuag los ntawm "tawg" mus rau "tawv." Qhov no zoo ib yam li ntxiv cov hlau tuav rau cov cement, uas tsis yog tsuas yog ua kom muaj zog tab sis, qhov tseem ceeb tshaj, muab qhov tseem ceeb toughness.
Dongguan Liansheng Nonwoven Technology Co., Ltd.tau tsim nyob rau hauv lub Tsib Hlis 2020. Nws yog ib tug loj-scale non-woven npuag ntau lawm enterprise integrating kev tshawb fawb thiab kev loj hlob, ntau lawm, thiab muag khoom. Nws tuaj yeem tsim ntau yam xim ntawm PP spunbond non-woven fabrics nrog qhov dav ntawm tsawg dua 3.2 meters los ntawm 9 grams mus rau 300 grams.
Post lub sij hawm: Nov-16-2025