Raws li lub tswv yim ntawm kev txhim kho kom ruaj khov nkag mus rau hauv kev lag luam kev zoo nkauj, ntau thiab ntau lub npe nrov tab tom tsom mus rau kev siv cov khoom siv zoo rau ib puag ncig hauv lawv cov ntim khoom. PMMA (polymethylmethacrylate), feem ntau hu ua acrylic, yog cov khoom siv yas uas siv dav hauv cov ntim khoom zoo nkauj, thiab nyiam heev rau nws qhov kev pom tseeb siab, kev tiv thaiv kev cuam tshuam, thiab cov khoom tiv thaiv ultraviolet (UV). Txawm li cas los xij, thaum tsom mus rau kev zoo nkauj, PMMA qhov kev phooj ywg ib puag ncig thiab nws lub peev xwm rov ua dua tshiab maj mam nyiam mloog.
PMMA yog dab tsi thiab vim li cas nws thiaj tsim nyog rau kev ntim khoom kom zoo nkauj?
PMMA yog ib yam khoom siv thermoplastic uas muaj pob tshab siab, uas tso cai rau ntau dua 92% ntawm lub teeb nkag mus, ua rau pom tseeb zoo li iav. Tib lub sijhawm, PMMA tiv taus huab cua zoo thiab tsis yooj yim daj lossis ploj txawm tias raug UV ntev. Yog li ntawd, ntau lub tshuaj pleev ib ce zoo xaiv siv cov ntim PMMA los txhim kho cov qauv thiab kev zoo nkauj ntawm cov khoom. Ntxiv rau nws qhov kev nyiam pom, PMMA kuj tiv taus tshuaj lom neeg, ua kom ntseeg tau tias cov tshuaj pleev ib ce ruaj khov thaum khaws cia.
Cov ntawv thov ib txwm rau PMMA ntim khoom suav nrog:
Lub hau fwj tshuaj pleev ib ce: PMMA tuaj yeem nthuav tawm cov qauv zoo li iav, uas haum rau qhov chaw ntawm cov khoom lag luam siab xws li cov tshuaj pleev ib ce.
Cov thawv hmoov thiab cov ntim khoom pleev kom zoo nkauj: PMMA qhov kev tiv thaiv kev cuam tshuam ua rau cov khoom muaj kev nyab xeeb dua thaum thauj mus los thiab siv txhua hnub.
Cov plhaub pob tshab: Cov plhaub pob tshab rau cov khoom xws li cov di ncauj pleev thiab cov hauv paus, piv txwv li, qhia cov xim ntawm cov ntsiab lus thiab ntxiv rau qhov kev xav zoo ntawm lub ntim khoom.
Lub peev xwm rov ua dua tshiab ntawm PMMA yog dab tsi?
Ntawm cov thermoplastics, PMMA muaj qee qhov peev xwm rov ua dua tshiab, tshwj xeeb tshaj yog vim nws cov tshuaj lom neeg ruaj khov tso cai rau nws kom tswj tau cov khoom zoo txawm tias tom qab ntau zaus rov ua dua tshiab. Hauv qab no yog ob peb txoj kev rov ua dua tshiab rau PMMA thiab lawv lub peev xwm rau cov ntawv thov ntim khoom kom zoo nkauj:
Kev siv tshuab rov ua dua tshiab: PMMA tuaj yeem siv tshuab rov ua dua tshiab los ntawm kev tsoo, yaj, thiab lwm yam kom ua rau cov ntim PMMA tshiab lossis lwm yam khoom dua. Txawm li cas los xij, PMMA rov ua dua tshiab yuav raug puas tsuaj me ntsis, thiab kev siv dua hauv cov ntim khoom zoo nkauj xav tau kev ua tiav zoo.
Kev siv tshuaj lom neeg rov ua dua tshiab: Los ntawm kev siv tshuab rhuav tshem tshuaj lom neeg, PMMA tuaj yeem tawg ua nws cov monomer MMA (methyl methacrylate), uas tom qab ntawd tuaj yeem polymerized los ua PMMA tshiab. Txoj kev no tswj hwm qhov huv siab thiab pob tshab ntawm PMMA, uas ua rau nws tsim nyog dua rau kev tsim cov ntim khoom zoo nkauj. Tsis tas li ntawd, kev siv tshuaj lom neeg rov ua dua tshiab yog tus phooj ywg ib puag ncig ntau dua li kev siv tshuab rov ua dua tshiab, tab sis nws tseem tsis tau siv ntau hauv kev lag luam tshuaj pleev ib ce vim nws cov nqi siab thiab cov kev xav tau kev siv tshuab.
Kev thov ua lag luam rau kev siv ruaj khov: Nrog rau kev loj hlob ntawm kev tiv thaiv ib puag ncig, ntau lub npe nrov zoo nkauj pib siv cov khoom siv PMMA rov ua dua tshiab rau kev ntim khoom. PMMA rov ua dua tshiab yog ze li cov khoom siv tshiab hauv kev ua tau zoo thiab tuaj yeem txo cov khoom siv raw, yog li txo cov pa roj carbon. Ntau thiab ntau lub npe nrov tau koom ua ke PMMA rov ua dua tshiab rau hauv lawv cov qauv khoom, uas tsis yog tsuas yog ua tau raws li qhov xav tau zoo nkauj xwb, tab sis kuj ua raws li qhov sib txawv ntawm kev tiv thaiv ib puag ncig.
Kev cia siab yav tom ntej rau PMMA rov ua dua tshiab hauv cov khoom ntim khoom siv pleev ib ce
Txawm hais tias muaj peev xwm rov ua dua tshiab ntawm PMMA hauv cov ntim khoom zoo nkauj, cov teeb meem tseem muaj. Tam sim no, cov thev naus laus zis rov ua dua tshiab ntawm PMMA tsis tau dav txaus, thiab kev siv tshuaj rov ua dua tshiab kim heev thiab me me. Yav tom ntej, thaum thev naus laus zis nce qib thiab ntau lub tuam txhab nqis peev rau hauv cov ntim khoom uas tsis ua rau ib puag ncig puas tsuaj, kev siv PMMA rov ua dua tshiab yuav ua haujlwm tau zoo dua thiab siv tau ntau dua.
Hauv cov ntsiab lus no, cov npe khoom zoo nkauj tuaj yeem txhawb kev txhim kho kom ruaj khov ntawm cov ntim khoom zoo nkauj los ntawm kev xaiv cov ntim khoom PMMA rov ua dua tshiab, ua kom zoo dua cov kev ntsuas ib puag ncig hauv cov khoom xa tuaj, thiab lwm yam. PMMA yuav tsis yog tsuas yog cov khoom siv zoo nkauj xwb, tab sis kuj yog qhov kev xaiv sawv cev rau kev sib xyaw ua ke ntawm kev tiv thaiv ib puag ncig thiab zam, yog li txhua pob khoom yuav pab tiv thaiv ib puag ncig.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-01-2024
