Tsis ntev los no, cov ntaub ntawv npog ntsej muag tau txais kev saib xyuas ntau, thiab peb cov neeg ua haujlwm polymer tsis tau muaj kev cuam tshuam hauv kev sib ntaus sib tua tiv thaiv kev sib kis. Niaj hnub no peb yuav qhia yuav ua li cas yaj tshuab PP khoom yog tsim.
Kev lag luam thov rau siab melting point PP
Lub yaj flowability ntawm polypropylene yog ze ze rau nws qhov hnyav molecular. Qhov hnyav nruab nrab molecular hnyav ntawm kev lag luam polypropylene resin npaj los ntawm cov pa Ziegler Natta catalytic system feem ntau yog nruab nrab ntawm 3 × 105 thiab 7 × 105. Lub yaj Performance index ntawm cov pa polypropylene resins feem ntau yog tsawg, uas txwv lawv daim ntawv thov ntau yam.
Nrog rau txoj kev loj hlob sai ntawm cov tshuaj fiber ntau kev lag luam thiab textile machinery kev lag luam, kev lag luam non-woven npuag tau nce sai heev. Cov koob ntawm qhov zoo ntawm polypropylene ua rau nws nyiam raw khoom rau cov ntaub tsis-woven. Nrog rau txoj kev loj hlob ntawm haiv neeg, daim ntawv thov teb ntawm non-woven fabrics zoo li dav: hauv kev kho mob thiab kev noj qab haus huv,non-woven fabricstuaj yeem siv los tsim cov ris tsho cais tawm, lub qhov ncauj qhov ntswg, lub tsho phais, poj niam cov ntaub so ntswg, cov ntaub so ntswg menyuam yaus, thiab lwm yam; Raws li lub tsev thiab geotechnical cov ntaub ntawv, non-woven fabrics yuav siv tau rau lub ru tsev waterproofing, kev tsim kho, thiab dej txuag tej yaam num, los yog siab heev ru tsev muaj peev xwm tsim tau siv spunbond thiab koob punched composite technology. Nws lub neej kev pabcuam yog 5-10 npaug ntev dua li kev xav asphalt; Cov ntaub ntawv lim kuj yog ib qho ntawm cov khoom lag luam sai tshaj plaws hauv cov ntaub ntawv tsis-woven, uas tuaj yeem siv rau kev siv roj thiab kua hauv kev lag luam xws li tshuaj, tshuaj, thiab zaub mov, thiab muaj peev xwm ua lag luam zoo; Tsis tas li ntawd, cov ntaub tsis-woven tuaj yeem siv rau kev tsim cov tawv hluavtaws, hnab, khaub ncaws hauv ob sab phlu, cov ntaub zoo nkauj, thiab cov ntaub so hauv lub neej txhua hnub thiab siv hauv tsev.
Vim yog kev txhim kho txuas ntxiv ntawm cov ntaub ntawv tsis-woven, cov kev xav tau rau lawv cov khoom siv thiab kev siv tau tas li, xws li yaj tshuab, kev kub ceev ntau lawm, thiab cov khoom nyias. Yog li ntawd, qhov yuav tsum tau ua rau kev ua tau zoo ntawm polypropylene cob, cov khoom siv tseem ceeb rau cov ntaub tsis-woven, kuj tau nce ntxiv; Tsis tas li ntawd, kev tsim cov high-speed spinning los yog nplua denier polypropylene fibers kuj yuav tsum tau polypropylene resin kom muaj cov khoom zoo yaj; Qee cov xim uas tsis tuaj yeem tiv taus qhov kub thiab txias yuav tsum tau ua cov polypropylene ua cov cab kuj ntawm qhov kub thiab txias. Tag nrho cov no yuav tsum tau siv ultra-high melt index polypropylene resin ua raw khoom uas tuaj yeem ua tiav ntawm qhov kub thiab txias.
Cov khoom tshwj xeeb rau meltblown fabrics yog siab yaj index polypropylene. Lub melt index yog hais txog qhov loj ntawm cov khoom molten dhau los ntawm tus qauv tuag capillary txhua 10 feeb. Qhov loj dua tus nqi, qhov zoo dua qhov kev ua haujlwm fluidity ntawm cov khoom. Qhov siab dua qhov melt index ntawm polypropylene, qhov zoo dua cov fibers tshuab tawm, thiab qhov zoo dua qhov pom kev ua tau zoo ntawm cov ntaub uas tsim tau yaj.
Txoj kev npaj siab yaj Performance index polypropylene cob
Ib qho yog los tswj qhov hnyav molecular thiab qhov hnyav molecular faib ntawm polypropylene los ntawm kev tswj cov txheej txheem polymerization cov tshuaj tiv thaiv, xws li siv txoj hauv kev los ua kom cov concentration ntawm inhibitors xws li hydrogen kom txo qhov hnyav molecular ntawm cov polymer, yog li ua kom lub melt index. Txoj kev no yog txwv los ntawm cov yam ntxwv xws li catalytic system thiab cov tshuaj tiv thaiv kab mob, ua rau nws nyuaj rau kev tswj xyuas qhov kev ruaj ntseg ntawm cov melt index thiab siv.
Yanshan Petrochemical tau siv cov metallocene catalysts rau kev ncaj qha polymerization ntawm yaj cov ntaub ntawv uas muaj melt index ntawm tshaj 1000 nyob rau hauv ob peb xyoos dhau los. Vim yog qhov nyuaj ntawm kev tswj kev ruaj ntseg, qhov loj-scale polymerization tsis tau ua tiav. Txij li thaum muaj tus kab mob sib kis xyoo no, Yanshan Petrochemical tau txais kev tswj hwm kev degradation polypropylene yaj cov khoom siv tshuab tsim tawm hauv xyoo 2010 los tsim cov khoom siv polypropylene yaj uas tsis yog-woven npuag tshwj xeeb rau lub Ob Hlis 12th. Nyob rau tib lub sijhawm, kev ntsuas kev lag luam tau ua ntawm cov cuab yeej siv metallocene catalysts. Cov khoom tau raug tsim tawm thiab tam sim no raug xa mus rau cov neeg siv qis rau kev sim.
Lwm txoj kev yog los tswj cov degradation ntawm polypropylene tau los ntawm cov pa polymerization, txo nws cov hnyav molecular thiab ua rau nws cov melt Performance index.
Nyob rau hauv lub dhau los, high-temperature degradation txoj kev yog feem ntau siv los txo cov molecular hnyav ntawm polypropylene, tab sis no high-temperature mechanical degradation txoj kev muaj ntau yam drawbacks, xws li poob ntawm additives, thermal decomposition, thiab cov txheej txheem tsis ruaj khov. Tsis tas li ntawd, muaj cov txheej txheem xws li ultrasonic degradation, tab sis cov txheej txheem no feem ntau xav kom muaj cov kuab tshuaj, uas ua rau kom muaj kev nyuaj thiab tus nqi ntawm cov txheej txheem. Nyob rau hauv xyoo tas los no, cov txheej txheem ntawm cov tshuaj degradation ntawm polypropylene tau maj mam siv dav.
Kev tsim cov siab yaj index PP los ntawm cov tshuaj degradation txoj kev
Txoj kev degradation tshuaj muaj xws li reacting polypropylene nrog tshuaj degradation agents xws li organic peroxides nyob rau hauv ib tug ntsia hlau extruder, ua rau cov molecular chains ntawm polypropylene tawg thiab txo lawv molecular hnyav. Piv nrog rau lwm txoj kev degradation, nws muaj qhov zoo ntawm kev ua kom tiav degradation, zoo yaj flowability, thiab yooj yim thiab muaj peev xwm npaj txheej txheem, ua rau nws yooj yim mus nqa tawm loj-scale industrial ntau lawm. Qhov no kuj yog txoj kev siv ntau tshaj plaws los ntawm kev hloov kho yas manufacturers.
Cov khoom siv
High melting point yog hais txog cov cuab yeej uas txawv kiag li ntawm cov khoom hloov kho PP zoo tib yam. Cov cuab yeej siv rau kev txau cov ntaub ntawv molten yuav tsum muaj qhov sib piv ntev dua thiab lub taub hau tshuab ntsug, lossis siv cov granulation hauv qab dej (Wuxi Huachen muaj qhov zoo sib xws hauv qab dej txiav); Cov khoom yog nyias nyias thiab yuav tsum tau los rau hauv kev sib cuag nrog dej tam sim ntawd tom qab tawm ntawm lub tshuab taub hau kom yooj yim txias;
Kev tsim cov pa polypropylene yuav tsum tau extruder txiav ceev ntawm 70 meters ib feeb, thaum lub siab melting point polypropylene yuav tsum tau txiav ceev tshaj 120 meters ib feeb. Tsis tas li ntawd, vim qhov ceev ceev ntawm qhov siab melting point polypropylene, nws qhov txias txias yuav tsum tau nce los ntawm 4 meters mus rau 12 meters.
Lub tshuab ua cov khoom siv yaj yuav tsum tau hloov mesh txuas ntxiv, feem ntau yog siv ob lub chaw nres tsheb mesh hloov pauv. Lub cev muaj zog yuav tsum tau muaj ntau dua, thiab ntau dua shear blocks yog siv nyob rau hauv cov ntsia hlau Cheebtsam;
1: Xyuas kom cov khoom noj zoo xws li PP thiab DCP;
2: Txiav txim siab qhov tsim nyog nam piv thiab axial txoj hauj lwm ntawm qhov qhib raws li ib nrab-lub neej ntawm cov qauv sib xyaw (uas tau hloov zuj zus mus rau tiam thib peb kom ntseeg tau tias du extrusion ntawm CR-PP cov tshuaj tiv thaiv);
3: Txhawm rau kom muaj txiaj ntsig zoo ntawm cov ntiv tes yaj hauv qhov kev ua siab ntev (ntau tshaj 30 daim kab xev tiav muaj tus nqi siab dua thiab kev sib xyaw ua ke piv rau tsuas yog kaum ob lub strips);
4: Tshwj xeeb underwater pwm taub hau yuav tsum tau nruab. Lub yaj thiab cua sov yuav tsum tau muab sib npaug, thiab cov khoom pov tseg yuav tsum tsawg;
5: Nws raug nquahu kom nruab ib lub tshuab txias txias rau cov ntaub ntawv meltblown (uas muaj lub koob npe nrov hauv kev lag luam) kom ntseeg tau qhov zoo ntawm cov khoom tiav thiab cov txiaj ntsig siab dua;
6: Yog tias muaj cov lus pom hauv online, nws yuav zoo dua.
Tsis tas li ntawd, tus pib degradation ntxiv rau sab pub nrog cov kua yuav tsum tau muaj tseeb dua vim qhov sib ntxiv me me. Rau sab pub khoom siv xws li imported Brabenda, Kubota, thiab domestically tsim Matsunaga.
Lub degradation catalyst tam sim no siv
1: Di-t-butyl peroxide, tseem hu ua di tert butyl peroxide, pib ib thiab vulcanizing tus neeg sawv cev dTBP, yog cov xim tsis muaj xim rau me ntsis daj pob tshab kua uas yog insoluble hauv dej thiab miscible nrog cov kuab tshuaj organic xws li benzene, toluene, thiab acetone. High oxidizing, flammable, kuj ruaj khov ntawm chav tsev kub, insensitive rau tej yam.
2: DBPH, abbreviated li 2,5-dimethyl-2,5-bis (tert butylperoxy) hexane, muaj qhov hnyav molecular ntawm 290.44. Lub teeb daj ua kua, muab tshuaj txhuam zoo li thiab cov hmoov dawb dawb, nrog cov txheeb ze ntawm 0.8650. Qhov chaw txias txias 8 ℃. Kub taw tes: 50-52 ℃ (13Pa). Refractive index 1.418 ~ 1.419. Cov kua viscosity yog 6.5 mPa. s. Flash point (qhib khob) 58 ℃. Soluble nyob rau hauv feem ntau cov organic solvents xws li cawv, ethers, ketones, esters, thiab aromatic hydrocarbons, insoluble nyob rau hauv dej.
3: ntiv tes melting test
Kev ntsuas cov ntiv tes yaj yuav tsum tau ua raws li GB / T 30923-2014 Polypropylene Melt Spray Cov Khoom Tshwj Xeeb; Cov txheej txheem yaj ntiv tes tsis tuaj yeem kuaj. High melting point hais txog kev siv ntim txoj kev es tsis yog txoj kev loj rau kev sim.
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-08-2024