Los ntawm Andy los ntawm Baiyear Hoobkas
Tshaj tawm rau lub Kaum Ib Hlis 2, 2022
Ntawm no yog lub chaw xov xwm ntawm Baiyear txoj kev txhaj tshuaj molding kev lag luam.Tom ntej no, Baiyear yuav faib cov txheej txheem txhaj tshuaj molding rau hauv ob peb nqe lus los qhia txog kev txheeb xyuas cov ntaub ntawv raw ntawm cov txheej txheem txhaj tshuaj molding, vim tias muaj ntau cov ntsiab lus.Tom ntej no yog tshooj plaub.
(8).PP (polypropylene)
1. Kev ua haujlwm ntawm PP
PP yog crystalline siab polymer.Ntawm cov khoom siv yas, PP yog lub teeb tshaj plaws, nrog qhov ceev ntawm tsuas yog 0.91g / cm3 (me dua dej).Ntawm cov khoom siv dav dav, PP muaj qhov ua kom sov zoo tshaj plaws, nws qhov kub thiab txias distortion yog 80-100 ℃, thiab nws tuaj yeem ua rau boiling dej.PP muaj kev ntxhov siab zoo tawg tsis kam thiab siab flexural qaug zog lub neej, feem ntau hu ua "folding kua nplaum".
Kev ua tau zoo ntawm PP yog zoo dua li cov khoom siv PE.PP cov khoom muaj lub teeb yuag, zoo toughness thiab zoo tshuaj tiv thaiv.Qhov tsis zoo ntawm PP: tsis tshua muaj qhov tseeb, tsis txaus rigidity, huab cua tsis zoo, yooj yim los tsim "tooj liab puas", nws muaj qhov tshwm sim tom qab shrinkage, thiab tom qab demolding, nws yog ib qho yooj yim rau hnub nyoog, ua nkig, thiab yooj yim rau deform.PP tau yog cov khoom siv tseem ceeb rau kev ua cov fibers vim nws cov xim muaj peev xwm, puas thiab tshuaj lom neeg ua haujlwm, thiab kev lag luam zoo.
PP yog cov khoom siv semi-crystalline.Nws yog ib qho nyuaj thiab muaj qhov melting point ntau dua li PE.Txij li thaum homopolymer PP yog nkig heev ntawm qhov kub siab tshaj 0 ° C, ntau cov khoom lag luam PP yog random copolymer nrog 1 txog 4% ethylene ntxiv lossis pincer copolymer nrog cov ntsiab lus ethylene siab dua.Cov khoom siv copolymer-hom PP muaj qhov qis dua thermal distortion kub (100 ° C), tsis tshua muaj pob tshab, tsis tshua muaj gloss, tsis tshua muaj rigidity, tab sis muaj kev cuam tshuam zoo zog.Lub zog ntawm PP nce nrog nce cov ntsiab lus ethylene.
Vicat softening kub ntawm PP yog 150 ° C.Vim muaj cov qib siab ntawm crystallinity, cov khoom siv no muaj qhov tawv tawv zoo thiab khawb tsis kam.
PP tsis muaj teeb meem kev ntxhov siab ib puag ncig.Feem ntau, PP yog hloov kho los ntawm kev ntxiv iav fibers, hlau additives los yog thermoplastic roj hmab.Tus nqi ntws MFR ntawm PP yog li ntawm 1 txog 40. PP cov ntaub ntawv uas tsis tshua muaj MFR muaj kev cuam tshuam zoo dua tab sis qis dua ductility.Rau tib cov khoom siv MFR, lub zog ntawm cov hom copolymer yog siab dua li homopolymer hom.
Vim crystallization, qhov shrinkage ntawm PP yog siab heev, feem ntau 1.8 ~ 2.5%.Thiab cov kev taw qhia sib xws ntawm shrinkage yog zoo dua li cov ntaub ntawv xws li HDPE.Ntxiv 30% iav additive tuaj yeem txo qhov shrinkage rau 0.7%.
Ob qho tib si homopolymer thiab copolymer PP cov ntaub ntawv muaj cov dej noo zoo heev nqus, acid thiab alkali corrosion kuj, thiab solubility kuj.Txawm li cas los xij, nws tsis tuaj yeem tiv taus cov tshuaj tsw qab hydrocarbon (xws li benzene) cov kuab tshuaj, chlorinated hydrocarbon (carbon tetrachloride) cov kuab tshuaj, thiab lwm yam. PP kuj tsis ua rau oxidation ntawm qhov kub thiab txias li PE.
2. Cov yam ntxwv ntawm PP
PP muaj fluidity zoo ntawm melting kub thiab zoo molding kev ua tau zoo.PP muaj ob yam hauv kev ua:
Ib qho: Cov viscosity ntawm PP yaj txo qis nrog qhov nce ntawm shear npaum li cas (nws tsis cuam tshuam los ntawm qhov kub thiab txias);
Qhov thib ob: lub degree ntawm molecular orientation yog siab thiab lub shrinkage tus nqi yog loj.Kev ua haujlwm kub ntawm PP yog 220 ~ 275 ℃.Nws yog qhov zoo dua tsis pub tshaj 275 ℃.Nws muaj qhov zoo thermal stability (decomposition kub yog 310 ℃), tab sis ntawm qhov kub thiab txias (270-300 ℃), nws yuav nyob hauv lub thoob rau lub sijhawm ntev.Nws muaj peev xwm degradation.Txij li thaum lub viscosity ntawm PP txo qis nrog kev nce ntawm shear ceev, nce qhov kev txhaj tshuaj thiab kev txhaj tshuaj ceev yuav txhim kho nws cov fluidity thiab txhim kho shrinkage deformation thiab kev nyuaj siab.Pwm kub (40 ~ 80 ℃), 50 ℃ yog pom zoo.
Lub degree ntawm crystallization yog txiav txim siab los ntawm qhov kub ntawm cov pwm, uas yuav tsum tau tswj nyob rau hauv thaj tsam ntawm 30-50 ° C.Lub PP yaj tuaj yeem dhau los ntawm qhov sib txawv ntawm qhov nqaim heev thiab tshwm draped.Thaum lub sij hawm melting txheej txheem ntawm PP, nws yuav tsum tau nqus ib tug loj npaum li cas ntawm fusion tshav kub (tsawg dua kub), thiab cov khoom yog kub dua tom qab ejected los ntawm pwm.
PP cov ntaub ntawv tsis tas yuav qhuav thaum lub sij hawm ua, thiab lub shrinkage thiab crystallinity ntawm PP yog qis dua cov PE.Kev txhaj tshuaj nrawm Feem ntau kev txhaj tshuaj nrawm tuaj yeem siv los txo qis hauv siab.Yog tias muaj qhov tsis xws luag ntawm qhov chaw ntawm cov khoom, ces kev txhaj tshuaj qis dua ntawm qhov kub siab dua yuav tsum tau siv.Txhaj siab: mus txog 1800bar.
Khiav thiab rooj vag: Rau cov neeg khiav dej txias, cov neeg khiav dej num ib txwm muaj li ntawm 4 txog 7 hli.Nws raug nquahu kom siv sprues thiab khiav nrog lub cev puag ncig.Txhua hom rooj vag tuaj yeem siv tau.Cov rooj vag zoo ib yam li ntawm 1 txog 1.5mm, tab sis cov rooj vag me me li 0.7mm kuj tuaj yeem siv tau.Rau ntug rooj vag, qhov tsawg kawg nkaus qhov rooj qhov tob yuav tsum yog ib nrab ntawm phab ntsa thickness;Qhov dav ntawm qhov tsawg kawg nkaus yuav tsum yog tsawg kawg yog ob zaug ntawm phab ntsa tuab, thiab cov ntaub ntawv PP tuaj yeem siv tag nrho cov txheej txheem kub khiav.
PP tau yog cov khoom siv tseem ceeb rau kev ua cov fibers vim nws cov xim muaj peev xwm, puas thiab tshuaj lom neeg ua haujlwm, thiab kev lag luam zoo.
3. Hom kev thov ntau yam:
Kev lag luam tsheb (tsuas yog siv PP nrog cov khoom siv hlau: fenders, cov kav dej cua, kiv cua, thiab lwm yam), cov khoom siv (lub tshuab ntxhua khaub ncaws lub qhov rooj, lub tshuab ziab khaub ncaws, tshuab ntxhua khaub ncaws thiab npog, tub yees qhov rooj, thiab lwm yam), cov khoom siv niaj hnub (cov nyom nyom. thiab cov khoom vaj khoom siv xws li lawnmowers thiab sprinklers, thiab lwm yam).
Txhaj tshuaj molding yog qhov thib ob loj tshaj plaws kev lag luam rau PP homopolymers, suav nrog ntim, kaw, daim ntawv thov tsheb, khoom siv hauv tsev, khoom ua si thiab ntau lwm tus neeg siv khoom thiab kev siv khoom kawg.
(9).PA (nylon)
1. Kev ua haujlwm ntawm PA
PA kuj yog cov yas crystalline (nylon yog tawv angular translucent lossis milky dawb crystalline resin).Raws li cov yas engineering, qhov hnyav molecular ntawm nylon feem ntau yog 15,000-30,000, thiab muaj ntau yam.Feem ntau siv nylon 6, nylon 66, thiab nylon 1010 rau kev txhaj tshuaj molding, Nylon 610, thiab lwm yam.
Nylon muaj toughness, hnav tsis kam thiab nws tus kheej lubrication, thiab nws qhov zoo yog tsuas yog siab organic mechanical zog, zoo toughness, qaug zog kuj, du nto, siab softening point, tshav kub tsis kam, tsis tshua muaj kev sib txhuam coefficient, hnav tsis kam, nws tus kheej lubrication, poob siab absorbing. Thiab txo suab nrov, roj tsis kam, tsis muaj zog acid tsis kam, alkali tsis kam thiab hnyav hnyav, hluav taws xob rwb thaiv tsev zoo, nws tus kheej tua, tsis muaj tshuaj lom, tsis muaj ntxhiab, huab cua tsis zoo.
Qhov tsis zoo yog tias cov dej nqus dej loj, thiab cov khoom siv dyeing tsis zoo, uas cuam tshuam rau qhov ruaj khov thiab cov khoom hluav taws xob.Fiber reinforcement tuaj yeem txo qhov nqus dej thiab ua kom nws ua haujlwm hauv qhov kub thiab txias.Nylon muaj kev sib raug zoo nrog cov iav fiber ntau (tuaj yeem siv tau ntev ntawm 100 ° C), corrosion kuj, lub teeb yuag thiab yooj yim molding.Lub ntsiab qhov tsis zoo ntawm PA yog: yooj yim nqus dej, nruj kev cai rau kev txhaj tshuaj molding, thiab tsis zoo qhov seem stability.Vim nws qhov tshwj xeeb kub kub, cov khoom yog kub.
PA66 yog lub zog txhua yam siab tshaj plaws thiab siv ntau yam hauv PA series.Nws crystallinity siab, yog li nws rigidity, hardness thiab kub tsis kam yog siab.PA1010 yog thawj zaug tsim nyob rau hauv kuv lub teb chaws nyob rau hauv 1958, nrog translucent, me me lub ntiajteb txawj nqus, siab elasticity thiab saj zawg zog, qis dua dej nqus tshaj PA66, thiab txhim khu kev qha dimension stability.
Ntawm cov nylons, nylon 66 muaj qhov siab tshaj plaws hardness thiab rigidity, tab sis qhov phem tshaj toughness.Ntau yam nylons tau txheeb los ntawm qhov nyuaj: PA66＜PA66/6＜PA6＜PA610＜PA11＜PA12
Lub flammability ntawm nylon yog ULS44-2, cov pa index yog 24-28, qhov decomposition kub ntawm nylon yog> 299 ℃, thiab spontaneous combustion yuav tshwm sim ntawm 449 ~ 499 ℃.Nylon muaj zoo yaj fluidity, yog li cov phab ntsa thickness ntawm cov khoom yuav ua tau me me li 1 hli.
2. Cov yam ntxwv ntawm PA
2.1.PA yog ib qho yooj yim kom nqus dej noo, yog li nws yuav tsum tau qhuav tag nrho ua ntej ua, thiab cov ntsiab lus noo noo yuav tsum tau tswj hauv qab 0.3%.Cov ntaub ntawv raw yog qhuav zoo thiab cov khoom gloss yog siab, txwv tsis pub nws yuav ntxhib, thiab PA yuav tsis maj mam soften nrog qhov nce ntawm cov cua sov kub, tab sis yuav soften nyob rau hauv ib tug nqaim kub ntau yam ze rau lub melting point.Flow tshwm sim (txawv ntawm PS, PE, PP, thiab lwm yam).
Lub viscosity ntawm PA yog qis dua li lwm cov thermoplastics, thiab nws cov melting kub ntau yog nqaim (tsuas yog li 5 ℃).PA muaj fluidity zoo, yooj yim sau thiab daim ntawv, thiab yooj yim tshem tawm.Lub nozzle yog nquag mus rau "salivation", thiab cov kua nplaum yuav tsum loj dua.
PA muaj qhov siab melting point thiab siab khov point.Cov khoom molten nyob rau hauv pwm yuav solidify txhua lub sij hawm vim hais tias qhov kub thiab txias poob hauv qab lub melting point, uas cuam tshuam qhov ua tiav ntawm lub filling molding.Yog li ntawd, yuav tsum tau siv high-speed txhaj tshuaj (tshwj xeeb tshaj yog rau nyias-walled los yog ntev-ntws qhov chaw).Nylon pwm yuav tsum muaj kev ntsuas kom txaus.
Nyob rau hauv lub xeev molten, PA tsis zoo thermal stability thiab yooj yim degrade.Qhov kub ntawm lub thoob yuav tsum tsis pub tshaj 300 ° C, thiab lub sij hawm cua sov ntawm cov khoom molten nyob rau hauv lub chim yuav tsum tsis txhob ntau tshaj 30 feeb.PA muaj cov kev xav tau siab ntawm cov pwm kub, thiab cov crystallinity tuaj yeem tswj tau los ntawm pwm kub kom tau qhov kev ua tau zoo.
Cov pwm kub ntawm PA cov khoom yog qhov zoo dua 50-90 ° C, qhov kub ntawm PA1010 yog qhov zoo dua 220-240 ° C, thiab qhov kub ntawm PA66 yog 270-290 ° C.PA cov khoom siv qee zaum xav tau "kev kho mob annealing" lossis "kev kho cov av noo" raws li qhov yuav tsum tau ua.
2.2.PA12 Ua ntej ua cov polyamide 12 lossis nylon 12, cov av noo yuav tsum tau khaws cia hauv qab 0.1%.Yog tias cov khoom khaws cia raug huab cua, nws raug nquahu kom qhuav hauv huab cua kub ntawm 85C rau 4 ~ 5 teev.Yog tias cov khoom khaws cia rau hauv lub thawv airtight, nws tuaj yeem siv tam sim ntawd tom qab 3 teev ntawm qhov kub thiab txias sib npaug.Lub melting kub yog 240 ~ 300C;rau cov ntaub ntawv zoo tib yam, nws yuav tsum tsis txhob ntau tshaj 310C, thiab rau cov ntaub ntawv uas muaj nplaim retardant zog, nws yuav tsum tsis txhob tshaj 270C.
Pwm kub: 30 ~ 40C rau unreinforced cov ntaub ntawv, 80 ~ 90C rau nyias-walled los yog loj cheeb tsam Cheebtsam, thiab 90 ~ 100C rau cov ntaub ntawv ntxiv.Ua kom qhov kub thiab txias yuav ua rau kom crystallinity ntawm cov khoom.Kev tswj qhov kub ntawm pwm yog qhov tseem ceeb rau PA12.Txhaj tshuaj siab: mus txog 1000bar (tsawg tuav siab thiab siab melting kub yog pom zoo).Kev txhaj tshuaj nrawm: kev kub ceev (zoo dua rau cov khoom siv nrog iav additives).
Khiav thiab rooj vag: Rau cov ntaub ntawv uas tsis muaj additives, txoj kab uas hla ntawm tus khiav yuav tsum nyob ib ncig ntawm 30 hli vim tsis muaj viscosity ntawm cov khoom.Rau cov khoom siv ntxiv, yuav tsum muaj txoj kab uas hla loj ntawm 5 ~ 8mm.Tus khiav zoo li yuav tsum yog txhua qhov ncig.Qhov chaw txhaj tshuaj yuav tsum luv li sai tau.
Ntau hom rooj vag tuaj yeem siv tau.Tsis txhob siv cov rooj vag me me rau qhov loj ntawm cov yas, qhov no yog kom tsis txhob muaj kev kub ntxhov ntau dhau los yog ntau dhau ntawm cov khoom yas.Lub thickness ntawm lub rooj vag zoo dua yog sib npaug ntawm cov thickness ntawm cov yas.Yog tias siv lub qhov rooj nkag, qhov tsawg kawg nkaus txoj kab uas hla ntawm 0.8mm yog pom zoo.Cov pwm kub khiav tau zoo, tab sis yuav tsum muaj kev tswj xyuas qhov kub thiab txias kom tiv thaiv cov khoom los ntawm kev xau los yog solidifying ntawm lub nozzle.Yog tias siv lub rooj sib tw kub, lub rooj vag loj yuav tsum me dua li ntawm tus neeg khiav dej txias.
2.3.PA6 Polyamide 6 lossis Nylon 6: Vim tias PA6 tuaj yeem nqus tau yooj yim, yuav tsum tau them nyiaj tshwj xeeb rau kev ziab ua ntej ua haujlwm.Yog tias cov khoom tau muab rau hauv cov ntim dej tsis zoo, lub thawv yuav tsum kaw kom nruj.Yog tias cov av noo ntau dua 0.2%, nws raug nquahu kom qhuav hauv huab cua kub siab tshaj 80C rau 16 teev.Yog tias cov khoom tau raug huab cua ntau tshaj 8 teev, lub tshuab nqus tsev ziab ntawm 105C rau ntau tshaj 8 teev yog pom zoo.
Melting kub: 230 ~ 280C, 250 ~ 280C rau ntau yam ntxiv.Pwm kub: 80 ~ 90C.Pwm kub cuam tshuam rau crystallinity, uas nyob rau hauv lem cuam tshuam rau txhua yam khoom ntawm yas qhov chaw.Crystallinity yog qhov tseem ceeb heev rau cov khoom siv, yog li qhov pom zoo pwm kub yog 80 ~ 90C.
Cov pwm kub siab dua kuj raug pom zoo rau nyias-walled, cov txheej txheem yas ntev dua.Ua kom cov pwm kub tuaj yeem ua rau kom muaj zog thiab nruj ntawm cov yas, tab sis nws txo qhov toughness.Yog tias cov phab ntsa thickness ntau dua 3 hli, nws raug nquahu kom siv cov pwm kub ntawm 20 ~ 40C.Rau iav reinforcement, pwm kub yuav tsum siab tshaj 80C.Kev txhaj tshuaj siab: feem ntau ntawm 750 ~ 1250bar (nyob ntawm cov khoom siv thiab cov khoom tsim).
Kev txhaj tshuaj nrawm: kev kub ceev (me ntsis qis dua rau cov khoom siv ntxiv).Khiav thiab rooj vag: Vim lub sij hawm luv luv ntawm PA6, qhov chaw ntawm lub rooj vag tseem ceeb heev.Lub rooj vag txoj kab uas hla yuav tsum tsis pub tsawg tshaj 0.5 * t (ntawm no t yog lub thickness ntawm cov yas).Yog tias siv cov neeg khiav dej kub kub, lub rooj vag loj yuav tsum me dua nrog cov neeg khiav dej num, vim tias cov neeg khiav dej num kub tuaj yeem pab tiv thaiv kom tsis txhob muaj cov khoom tawg ntxov ntxov.Yog tias siv lub qhov rooj nkag, qhov tsawg kawg nkaus txoj kab uas hla ntawm lub rooj vag yuav tsum yog 0.75mm.
2.4.PA66 Polyamide 66 lossis Nylon 66 Yog tias cov khoom raug kaw ua ntej ua tiav, tsis tas yuav ziab.Txawm li cas los xij, yog tias lub thawv ntim tau qhib, ziab hauv huab cua kub ntawm 85C yog pom zoo.Yog tias cov av noo ntau dua 0.2%, lub tshuab nqus tsev ziab ntawm 105C rau 12 teev yog xav tau.
Melting kub: 260 ~ 290C.Cov khoom rau iav additive yog 275 ~ 280C.Melting kub yuav tsum tsis txhob siab tshaj 300C.Pwm kub: 80C pom zoo.Pwm kub yuav cuam tshuam rau crystallinity, thiab crystallinity yuav cuam tshuam rau lub cev ntawm cov khoom.
Rau nyias-walled yas seem, yog siv pwm kub qis dua 40C, crystallinity ntawm cov yas yuav hloov nrog lub sij hawm.Yuav kom tswj tau qhov geometric stability ntawm cov khoom yas, annealing yuav tsum tau kho.Kev txhaj tshuaj siab: feem ntau 750 ~ 1250bar, nyob ntawm cov khoom siv thiab cov khoom tsim.Kev txhaj tshuaj ceev: kev kub ceev (me ntsis qis dua rau cov khoom siv ntxiv).
Khiav thiab rooj vag: Txij li thaum lub sij hawm solidification ntawm PA66 yog luv heev, qhov chaw ntawm lub rooj vag tseem ceeb heev.Lub rooj vag txoj kab uas hla yuav tsum tsis pub tsawg tshaj 0.5 * t (ntawm no t yog lub thickness ntawm cov yas).Yog tias siv cov neeg khiav dej kub kub, lub rooj vag loj yuav tsum me dua nrog cov neeg khiav dej num, vim tias cov neeg khiav dej num kub tuaj yeem pab tiv thaiv kom tsis txhob muaj cov khoom tawg ntxov ntxov.Yog tias siv lub qhov rooj nkag, qhov tsawg kawg nkaus txoj kab uas hla ntawm lub rooj vag yuav tsum yog 0.75mm.
3. Hom kev thov ntau yam:
3.1.PA12 Polyamide 12 los yog Nylon 12 Daim Ntawv Thov: Dej ntsuas dej thiab lwm yam khoom siv coj mus muag, lub tes tsho cable, lub tshuab cam, zawv zawg mechanisms thiab bearings, thiab lwm yam.
3.2.PA6 Polyamide 6 los yog Nylon 6 Daim Ntawv Thov: Nws yog dav siv hauv cov khoom siv vim nws lub zog zoo thiab tawv.Vim nws zoo hnav tsis kam, nws kuj yog siv los tsim bearings.
3.3.PA66 Polyamide 66 lossis Nylon 66 Daim Ntawv Thov: Piv nrog PA6, PA66 yog siv dav hauv kev lag luam tsheb, ntsuas vaj tse thiab lwm yam khoom uas yuav tsum tau muaj kev cuam tshuam thiab kev xav tau siab zog.
Txhawm rau txuas ntxiv, yog tias koj xav paub ntau ntxiv, thov koj xav tiv tauj peb.Baiyear yog lub koom haum loj loj ua ke nrog cov yas pwm tsim, txhaj tshuaj molding thiab cov ntawv hlau ua.Lossis koj tuaj yeem ua tib zoo mloog mus rau lub chaw xov xwm ntawm peb lub vev xaib official: www.baidasy.com , peb tseem yuav hloov kho cov xov xwm kev paub txog kev txhaj tshuaj molding kev lag luam.
Hu rau: Andy Yang
Dab tsi yog app: +86 13968705428
Email: Andy@baidasy.com
Post lub sij hawm: Nov-29-2022
