Kev kho deg ntawm UHMWPE Fiber

Kev kho saum npoo ntawm UHMWPE fiber ntau tuaj yeem muab faib ua kev hloov kho lub cev thiab tshuaj hloov kho raws li cov qauv sib txawv ntawm txoj kev kho mob. Raws li cov kev hloov kho sib txawv siv, ntau txoj hauv kev tuaj yeem muab faib. Thaum kawm txog kev hloov kho cov nyhuv, nws yuav tsum tau muab sau tseg tias ib txoj kev feem ntau muaj ob qho tib si hloov kho lub cev thiab tshuaj hloov cov yam ntxwv. Yog li ntawd, hauv kev sib tham hauv qab no, raws li cov txheej txheem tshwj xeeb tau muab cais tawm.
Kev kho mob ntshav plasma
Kev kho ntshav plasma tau muab faib ua ob hom: kev kho ntshav plasma qis thiab plasma graft nto kho.
Lub thiaj li hu ua HMWPE fiber ntau low-temperature plasma deg kho mob yog kom nqus cov HMWPE fiber ntau ntxuav ntawm ob daim hlau ntawm cov cuab yeej kho ntshav, pib cov cuab yeej tsim cov ntshav nyob rau hauv ib puag ncig tsawg dua 40Pa, ua kev kho cov ntshav plasma qis. fiber ntau rau qee lub sijhawm, thiab tom qab ntawd tshem tawm cov fiber ntau rau kev khaws cia.
Lub npe hu ua UHMWPE fiber ntau plasma graft nto kev kho mob yog txhawm rau ntxuav UHMWPE fiber ntau hauv cov tshuaj monomer, coj nws tawm tom qab qee lub sijhawm, thiab muab tso rau hauv cov cuab yeej plasma kub rau kev kho mob ntxiv. Tom qab kev kho mob, cov ntsiab lus nquag raug tsim tawm ntawm qhov chaw fiber ntau los ua rau cov graft polymerization ntawm monomer ntawm fiber ntau. Thaum kawg, homopolymer ntawm fiber ntau tau ntxuav nrog acetone thiab khaws cia rau tom qab siv.
Qhov tsis muaj zog binding txheej (WBL) tsim nyob rau saum npoo ntawm UHMWPE fiber ntau nyob rau hauv cov txheej txheem spinning yog txuas ntxiv crosslinked los ntawm ultraviolet hluav taws xob ntawm plasma, thiab lub zog cohesion ntawm UHMWPE fiber ntau yog txhim kho. Tsis tas li ntawd, ntau pawg neeg nquag tuaj yeem tsim nyob rau saum npoo ntawm cov fiber ntau tom qab kev kho cov ntshav ntshav, xws li: -CO H -, -co -, -COO, -COO - thiab lwm pab pawg nquag, uas muaj txiaj ntsig zoo rau cov tshuaj lom neeg. ua ke ntawm fiber ntau thiab matrix resin. Plasma kev kho mob kuj tsim grooves ntawm fiber ntau nto thiab ua rau kom cov roughness nto, uas yog conducive rau mechanical bonding nrog lub matrix. Kev ua tau zoo ntawm HMWPE fiber ntau raws li cov khoom siv sib xyaw tau zoo heev los ntawm txoj kev no, thiab lub zog interlayer shear zog tau nce ntau dua 3 zaug. Txawm li cas los xij, tus nqi attenuation ntawm cov pab pawg nquag ntawm UHMWPE fiber ntau tom qab kev kho mob ntawm cov ntshav plasma yog qhov loj, thiab tus nqi attenuation yog ib feem peb hauv ob teev. Thiab txoj kev kho mob yuav tsum muaj lub tshuab nqus tsev siab, xav tau lub siab tsawg dua 40Pa. Yog li ntawd, UHMWPE fiber ntau plasma nto kho yog qhov nyuaj rau kev ua tiav cov tshuaj lom neeg kev lag luam tas mus li.
Kev kho mob Corona tawm
Lub npe hu ua UHMWPE fiber ntau corona tawm qhov chaw kho mob yog tso cov khoom siv tu UHMWPE ntawm ob daim hlau ntawm cov khoom siv kho mob corona nyob rau hauv ib txwm siab kom thauj khoom txog 60 KV high voltage, lub zog yog li 350W, kom huab cua ionized, corona yog tsim, thiab kev kho mob raug coj tawm mus siv tom qab qee lub sijhawm.
Corona tshem tawm qhov kev kho mob tuaj yeem ua rau thaj chaw ntawm UHMWPE fiber ntau, ua rau thaj chaw sib cuag ntawm fiber ntau thiab cob, thiab tsim cov tshuab meshing ua haujlwm tom qab resin kho ntawm fiber ntau. Qhov luaj li cas ntawm cov tshuab meshing yog ze ze rau qib ntawm infiltration ntawm resin ntawm fiber ntau thiab qhov chaw sib cuag ntawm resin thiab fiber, tab sis lub zog siab tshaj plaws ntawm lub cev ua haujlwm no tsuas yog 24 KJ · mol-1. Yog li ntawd, nws raug txwv los txhim kho kev sib txuas ntawm lub zog ntawm fiber ntau thiab cob los ntawm corona tso tawm ib leeg. Tsuas yog kev kho mob corona tawm tau tshaj tawm rau kev kho mob ntawm polyolefin films. Txawm hais tias qee cov khoom lag luam ntawm HMWPE fiber ntau tam sim no kho los ntawm cov kab mob corona yooj yim, cov nyhuv tsis pom tseeb. Thiab kev kho mob corona tso tawm feem ntau txwv los ntawm kev ua haujlwm tsis sib xws. Yog li ntawd, nws yog qhov nyuaj heev kom paub txog kev lag luam thiab txuas ntxiv ntawm kev kho mob corona tawm.
Irradiation induced nto grafting
Lub thiaj li hu ua UHMWPE fiber irradiation induced nto grafting kev kho mob yog graft polymerize lub thib ob monomer nyob rau saum npoo ntawm lub fiber los ntawm hluav taws xob, thiab tsim ib tug tsis muaj txheej txheem uas yuav tsum tau nyob rau hauv kev sib raug zoo nrog lub matrix, thiaj li mus txhim kho lub adhesion ntawm lub fiber. thiab matrix. Feem ntau cov hluav taws xob yog 60C, gamma ray / ultraviolet lub teeb, thiab lwm yam, nyob rau hauv uas ultraviolet lub teeb pib lub photosensitizer, xws li benzophenone (BP), thiab tom qab ntawd cov photosensitizer pib lub monomer grafting rau saum npoo ntawm UHMWPE fiber. Tam sim no, qhov thib ob monomer siv yog propylene monomer, xws li: acrylic acid (AA), acrylamide (AM), glycidyl methacrylate (GMA) thiab lwm yam.
UHMWPE fiber ntau UV-triggered crosslinking nto kev kho mob tuaj yeem paub cov txheej txheem txuas ntxiv hauv txoj kev xav, thiab tsuas yog cuam tshuam rau txheej txheej nyias, yog li nws muaj kev cia siab ntawm daim ntawv thov kev lag luam. Txawm li cas los xij, vim hais tias cov fiber ntau yuav tsum tau irradiated rau ib lub sij hawm ntawm lub sij hawm, intermittent lag luam txwv nws daim ntawv thov mus rau ib tug loj npaum li cas.
Cov txheej txheem oxidation
Lub npe hu ua UHMWPE fiber ntau oxidizing nto kho txoj kev yog oxidize fiber nto los ntawm cov tshuaj siv tshuaj los yog gases, thiaj li hloov cov roughness ntawm fiber ntau nto thiab cov ntsiab lus ntawm polar pawg nyob rau saum npoo. Raws li qhov nruab nrab oxidation tuaj yeem muab faib ua txoj kev ntub dej thiab qhuav txoj kev ob pawg. Cov txheej txheem ntub dej yog kua theem oxidation, nws cov xov xwm muaj xws li: K2 Cr2O2 + H2 SO4, KMnO4+ HNO3, H2O2 (30%) thiab lwm yam; Qhov huv huv UH2MWPE fiber ntau yog immersed nyob rau hauv nruab nrab, tshem tawm tom qab oxidation kev kho mob ntawm qhov ntsuas kub rau lub sij hawm teev, thiab ntxuav mus rau nruab nrab; Ntxuav hauv dej deionized ob peb zaug, qhuav thiab tso tseg. Txoj kev qhuav yog roj theem oxidation txoj kev, feem ntau siv photooxidation thiab ozone oxidation; Tom qab pretreatment, huv si UHMWPE fiber ntau raug rau nruab nrab roj, tshem tawm rau ib tug tej yam tshuaj tiv thaiv lub sij hawm, ntxuav nrog ionized dej, qhuav rau siv.
Txoj kev ua kua oxidation yog qhov me me thiab yooj yim rau kev tswj, tab sis kev ua haujlwm yog cumbersome, cov khoom yuav tsum tau siab, thiab cov pa phem heev. Nyob rau hauv cov txheej txheem ntawm cov roj theem oxidation, cov cuab yeej yog yooj yim, kev khiav hauj lwm yog yooj yim, thiab cov nruam ntau lawm yog ib qho yooj yim, tab sis oxidation degree yog ib qho nyuaj rau tswj, uas tej zaum yuav ua rau oxidation degree tob heev thiab ua rau lub fiber ntau zog. poob. Hauv luv luv, kom ua tiav qhov kev kho mob oxidation tas li, nws yog ib qho tsim nyog yuav tsum ua qee yam kev txhim kho hauv kev ua haujlwm thiab cov khoom siv.
Kev kho tshuaj crosslinking
Tshuaj crosslinking txoj kev yog siv ncaj qha los ntawm tus thawj tswj hwm los pib monomer grafting ntawm fiber ntau, zoo ib yam li irradiation pib grafting txoj kev, tab sis tuaj yeem zam irradiation grafting txoj kev hauv cov cuab yeej siv peev, txoj kev no yog cov txheej txheem yooj yim, yooj yim rau kev ua lag luam tas mus li.
Lang Yanqing et al. siv peroxide ua tus pib ua silane crosslinking hloov kho ntawm UHMWPE fiber ntau. Txoj kev tshawb nrhiav pom tias tom qab kev hloov kho silane, silane molecules tau grafted rau ntawm fiber ntau, uas ua rau muaj pes tsawg leeg thiab polarity ntawm cov tshuaj lom neeg ua haujlwm ntawm cov fiber ntau, yog li txhim kho cov khoom sib txuas ntawm fiber ntau thiab matrix resin. Tom qab kev kho mob graft, ntau cov cim tau tshwm sim nyob rau saum npoo ntawm fiber ntau, uas ua rau cov neeg kho tshuab cuam tshuam cov nyhuv ntawm cov fiber ntau thiab cov resin, thiab nce lub zog interlayer shear lub zog ntawm cov khoom sib xyaw, uas yog 2.45 npaug ntawm cov khoom sib xyaw ua ntej kev hloov kho. Nyob rau tib lub sijhawm, kev nkag siab ntawm kev hloov kho fiber ntau kuj tau txhim kho.
Lwm txoj kev ua
Ntxiv nrog rau kev kho ntshav ntshav, tshuaj oxidation reagent, nto grafting thiab corona tawm kev kho mob, calendering thiab txheej txheej tuaj yeem txhim kho cov khoom sib txuas ntawm UHMWPE fiber ntau thiab resin matrix rau qee yam.
Cov txheej txheem calendering yog tias UHMWPE fiber ntau tau hloov pauv los ntawm qhov qub voj voog mus rau ib qho chaw tiaj tus tom qab qhov kev txiav txim ntawm ib khub ntawm cov xovxwm rollers, yog li ntawd qhov chaw sib cuag tau nce ntxiv hauv cov khoom sib xyaw, thiab cov cuab yeej sib txuas tau zoo tuaj rau qee yam. , tab sis nws tsis pom tseeb. Cov txheej txheem txheej yog txheej txheej ntawm reagent rau saum npoo ntawm UHMWPE fiber ntau. Los ntawm kev tsim khoom ntawm ultra-high molecular hnyav polyethylene fiber ntau kom deb li deb, qhov zoo tagnrho reagent tsis tau tsim rau txheej. Cov reagent no yuav tsum ua tus neeg sawv cev sib txuas los txhim kho cov khoom sib txuas ntawm UHMWPE fiber ntau thiab matrix. Cov nyhuv ntawm cov txheej txheem no rau kev txhim kho cov interlayer adhesion ntawm UHMWPE fiber ntau thiab matrix tsis pom tseeb, yog li kev hloov kho kev tshawb fawb ntawm cov txheej txheem no tsis ntau npaum li cov txheej txheem dhau los.
Vim yog txoj hauv kev tam sim no, thaum txhim kho cov fiber ntau wettability, cov khoom siv kho tshuab ntawm cov fibers kho yuav raug txo kom ntau ntau, thiab daim ntawv thov ntawm fibers yuav raug txwv. Qee tus neeg tau muab txoj kev kho mob sib xyaw los kho UHMWPE fiber ntau, uas tuaj yeem daws qhov teeb meem no. Wang Chengzhong et al. nqa tawm kev kho qhov chaw ntawm UHMWPE fiber ntau los ntawm chromic acid kua theem oxidation thiab nano silica sol txheej, thiab kawm txog cov khoom sib txuas ntawm UHMWPE fiber ntau / epoxy resin composite. Cov txiaj ntsig tau pom tias ob qho tib si ua kua theem oxidation thiab txheej txheej tuaj yeem txhim kho cov khoom sib txuas ntawm cov khoom sib xyaw, tab sis cov kua theem oxidation kev kho lub sij hawm ntev dhau lawm, lub zog fiber ntau yuav raug txo, thaum cov kev kho sib xyaw ua ke muaj kev sib koom ua ke, tsis tuaj yeem. txo lub zog fiber ntau tab sis zoo heev txhim kho lub interlayer shear lub zog ntawm cov ntaub ntawv sib xyaw, yog txoj kev kho saum npoo zoo.