Daim ntawv thov ntawm Polyurethane Hot Melt Adhesive hauv Phau Ntawv Kev Txim
Peb yog ib lub lag luam loj hauv Shenzhen Tuam Tshoj. Peb muaj cov phau ntawv luam tawm, phau ntawv nyuaj, phau ntawv luam ntawv, phau ntawv nyuaj, phau ntawv luam tawm, phau ntawv luam tawm, phau ntawv luam tawm, lub thawv ntim, daim qhia ntawv, txhua yam ntawm PVC, cov ntawv luam tawm, ntawv sau cia, hom tshwj xeeb ntawv xim luam tawm khoom, kev ua si cardand li ntawd.
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Polyurethane (PUR) nplaum yog hais txog ib hom tshuaj nplaum uas muaj cov leeg urethane (-NHCOO-) los yog ib pawg neeg isocyanate (-NCO-) hauv cov yeeb yaj duab molecular. Vim hais tias cov TSIS TXHOB hauv cov roj molecular tuaj yeem ua haujlwm nrog ntau hom kev ua haujlwm ntawm hydrogen uas muaj cov neeg ua haujlwm, nws tsim tau ib qho kev sib txuas ntawm cov tshuaj, uas muaj zog ntawm adhesion rau ntau yam ntaub ntawv, muaj ib zaj duab xis tawv, muaj kev tiv thaiv zoo, yooj, thiab tev lub zog. Siab, zoo ua hauj rau ultra-low temperature, roj thiab puas thwj. Kub qhuav nplaum (npe hu ua kub yaj nplaum) yog ib hom qauv hnyav tsis muaj zog polymer raws li thermoplastic polymer. Nws yog melted rau hauv ib lub xeev kua los ntawm tshav kub thiab ua ntawv thov mus rau saum npoo ntawm lub substrate raws li ib tug yaj rau tsevneeg. Kub yaj nplaum muaj qhov zoo ntawm kev ceev tsev, tsis muaj tshuaj lom neeg thiab tsis-polluting, txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, yooj yim cia thiab tsheb thauj mus los, luv nqi thiab dav daim ntawv thov, xws li EVA, PE, random PP thiab polyurethane. Polyurethane hot melt adhesives yuav muab faib ua ob pawg: ib qho yog xim reactive kub nplaum, uas yuav muab faib ntxiv mus rau hauv lub dav hlau isocyanate raws li prepolymer hom (noo noo hom) thiab kaw isocyanate raws li prepolymer hom (latent tua hom). Lwm hom yog ib qho thermoplastic polyurethane elastomer kub qhuav nplaum uas yog crosslinked los ntawm hydrogen tsev rau hauv cov lus qhia kom muab nws zoo heev elasticity thiab lub zog. Tom qab cov qub yog rhuab thiab melted, nws reacts thiab kho nyob rau hauv cov ntaub ntawv ntawm noo noo; Hos tus txheej txheem tsim los ntawm kev sib koom tes yog siv cov kev sib raug zoo ntawm hydrogen, thiab lub tshav kub tsis muaj zog dua, uas tsis muaj zog txaus rau cov dej hydrogen thiab ua kua dej khov, yog li nws yuav rov qab ua kom txias dua, cov khoom siv dua los sis theem nrab, cov khoom siv tau zoo.
Qhov thib ob, Polyurethane kub qhuav nplaum nplaum txoj kab hlau
Lub PUR rein muaj ib pawg neeg ua haujlwm NCO ua haujlwm nyob rau ntawm qhov kawg ntawm cov khoom molecular. Txij thaum cov pa roj carbon dioxide ua rau cov neeg ua haujlwm hauv lub cev ua haujlwm siab heev, nws reacts nrog huab cua lossis dej ua pa ntawm lub substrate los tsim ib pawg amine, thiab tib lub sij hawm tawm rau CO 2 thiab amine pawg. Reacts nrog rau lwm pawg NCO los tsim ib lub qauv uas muaj cov tshuaj hu ua urea (urea). Txij li thaum lub hydrogen tseem nyob tam sim no nyob rau hauv lub qauv urea, nws ntxiv yog reacted nrog cov uncoacted NCO pawg tsim daim biuret, thiab qhov sib tw crosslinking cov tshuaj tiv thaiv tiav. Nws cov tshuaj tiv thaiv mechanism nrog noo noo yog raws li nram no:
-NCO H2O → NH2 + CO2 → -NH-CO-NH
-NH-CO-NH- + OCN- → NH-CO-N-CO-NH-
Nws tuaj yeem pom los ntawm cov lus saum toj no uas PUR nplaum ua txoj kab txoj hlua yog ib txoj hau kev tiv thaiv, uas yog qhov sib txawv ntawm cov kev tua hluavtaws ntawm EVA hom kub yaj thiab cov kua dej ua kua. Raws li txoj kev xav ntawm tsevneeg txoj kev xav, nws ntseeg hais tias muaj cov tswv yim ua ke xws li kev tshawb pom kev ua haujlwm, kev tawm tswv yim txog kev tawm tswv yim, kev tawm dag zog, kev tshawb pom electrostatic, thiab kev sib txuas tshuaj chemical. Hauv kev sib piv, kev sib txuas tshuaj ua kom muaj zog dua ntawm kev ua kom tiav tshaj qhov ua tsev. Feem ntau, EVA kub melt adhesives muaj mechanical, adsorption, diffusion thiab lwm yam kev sib raug zoo nkauj; thaum PUR adhesives muaj ntau txoj hlua tiv thaiv cov tshuaj, uas tawm nrog rau cov khoom siv los tsim ib qho "tsis muaj tag nrho", yog li PUR kho tau. Cov khoom lag luam ua tau zoo heev.
Thib peb, daim ntawv thov ntawm lub tshav kub nplaum nyob rau hauv phau ntawv ruaj thiab nws qhov zoo thiab qhov tsis zoo
1. Daim ntawv teev npe nyob rau hauv bookbinding
Nrog kev ras txog ntawm kev tshaj tawm thiab kev noj qab haus huv, tib neeg tsis tsuas them nqi rau kev ua haujlwm thiab daim ntawv thov ntawm cov khoom ua ke, thiab cov tseev kom muaj kev tiv thaiv ib puag ncig ntawm cov khoom ua tau zoo dua, thiab tus phooj ywg zoo kom tau raws li peb cov cai ntawm "kev tiv thaiv ib puag ncig , kev noj qab haus huv thiab kev nyab xeeb "raug tsim tawm. Ntsuab adhesives yog qhov tseem ceeb. Cov neeg nyob hauv cov qauv txheej txheem ntxiv zoo dua qub, tshwj xeeb tshaj yog nyob rau Tebchaws Europe thiab hauv Tebchaws Meskas, cov neeg ua raws li cov khoom luam tawm tuaj yeem ua qauv zoo, cov tshiab, thiab tus kheej, uas ua rau cov txheej txheem tsim ntau thiab ntau dua, cov khoom lag luam zoo yuav tau txais ntau dua. Raws li ib hom tshiab ntawm nplaum, PUR kub yaj nplaum muaj cov yam ntxwv tsis muaj zog ntawm volatility, tshav kub thiab txias ua haujlwm, hnyav ua haujlwm thiab qaug zog tsis kam. Cov no yog ua raws li cov kev xav tau ntawm kev txhim kho tam sim no.
Hauv kev lag luam thiab ntim kev lag luam, PUR kub yaj yaj cov ntaub ntawv siv rau hauv cov khoom ntim, yas luam ntawv, yas yas yas, thiab lub thawv yas manufacturing. PUR hot melt adhesives yog PUR prepolymers nrog cov davhlau ya nyob twg. Rau cov ntawv luam tawm, kev sib tw ua ke tshwm sim thaum lub davhlau yaig nyob rau ntawm cov cua ya los yog daim ntawv ncav cuag ib qho av. Tom qab cov prepolymer yog wetted, nws tuaj yeem nkag mus rau hauv ntawv zoo thiab sib txuas nrog cov phom ntau hauv daim ntawv kom ua tau siab dua viscosity thiab siab dua daim ntawv nro. Hauv 20 lub xyoo dhau los no, ua tsaug rau txoj kev tsim kho cov txheej txheem ntawm kev sib txuas lus hauv wireless, daim ntawv thov ntawm cov kub yaj hauv phau ntawv tuav tswv yim tau raug tsim. EVA kub melt nplaum muaj zoo adhesion thiab elasticity. Tam sim no, feem ntau ntawm cov ntawv ceebtoom kub yaj cov nplaum rau ntawm lub khw lag luam yog EVA kub qhuav yaj. Txawm li cas los xij, EVA hom kub yaj nplaum yeej kim heev thiab muaj qhov tsis zoo ntawm kev nco, yog li nws nyam kaw thaum koj xav qhib phau ntawv, thiab nyhav qhib thaum koj xav kaw nws, lossis ua ib daim ntawv nplhaib los yog hauv phau ntawv cog lus thaum phau ntawv nyeem. on. Polyurethane kub nplaum nplaum nplaum muaj txheej txheem yooj yim thiab cov nqi pheej yig, uas tuaj yeem tsim ua rau cov tsis raws li hais los saum toj no. Cov nplaum muaj qhov ua kom zoo thiab muaj zog, muaj zog ua kom muaj zog, thiab cov nplaum yuav rov qab siv dua thiab siv, thiab qhov siv cov khoom siv yog siab, thiab muaj kev nrhav daim ntawv thov.
2. Qhov zoo ntawm daim ntawv thov
Hauv phau ntawv sau cov ntaub ntawv, sib piv nrog cov tshuaj EVA kub yaj, cov kua nplaum ua tau yooj yim, kev siv yooj yim, kev ntsuas kub tsawg, kev cuam tshuam thiab qaug zog, zoo flattening, kav ntev, thiab muaj zog adhesion. Zoo li kev tiv thaiv ib puag ncig.
Rau tom qab luam phau ntawv, PUR kub yaj nplaum yuav ncav cuag lub zog ntawm EVA kub yaj tom qab 6 xuab moos, thiab qhov ua tau zoo tshaj plaws yuav ua tiav tom qab 48 xuab moos. Daim ntawv txheej thiab cov ntaub ntawv nrog cov khoom sib txawv xws li tus lej, cov kua roj vanish, txheej UV-kho, thiab cov yeeb yaj kiab yas tsis muaj kev cuam tshuam zoo heev ntawm cov khoom ntim ntawm PUR kub yaj. Muab piv nrog cov tshuaj EVA adhesives, Cov khoom siv tshuaj ntsuam xyuas (xws li phau ntawv cov nplooj ntawv, cov nplooj ntawv tshawb nrhiav) yuav muaj ntau tshaj 60% dua. Cov tsoos EVA kub yaj nplaum nplev bookbinding sizing kub yog li 160-180 ° C, PUR kub yaj nplaum sizing kub tsawg, tsuas 120-150 ° C, heev haum siab kub, kuj tsis paub meej ntaub ntawv, nws yuav txuag zog thiab nce kev ua haujlwm ntawm cov neeg ua haujlwm. Rau cov phau ntawv nyeem ntau dua, cov tshuaj EVA kub yaj yuav siv xauv ua cov ntawv, thaum PUR kub yaj yaj yuav txo tau cov txheej txheem no, txuag cov nqi, thiab txo lub sijhawm ua haujlwm ntau ntxiv. PUR kub yaj txheej nplaum yog muag, uas ua rau phau ntawv yooj yim nyeem thiab quav. Ua ib qhov kev sib txuas ntawm lub chaw sib txuas, nws muaj kev kawm zoo tiv thaiv kev poob siab thiab kev qaug zog. Rau qee cov ntaub ntawv ntev xws li cov phau ntawv thiab phau ntawv qhia, Cov lus qhia yuav tsum muaj rau cov phau ntawv kawm, cov phau ntawv kawm, thiab lwm yam (qhov kev kawm uas qhib rau cov phau ntawv), PUR hot erinding binding yog qhov tseemceeb. Vim qhov kev sib txuam siab sib txuas ntawm PUR kub yaj nplaum, nws muaj cua kub ua haujlwm, tsis tshua muaj kev kub hnyiab, hnyav ua haujlwm, dej tsis txaus thiab lwm yam khoom zoo heev. Rau qee cov ntaub ntawv khaws cia ntev xws li duab albums, duab xyoo ntawv, thiab qib siab kev cai qub. Cov lus thiab cov ntawv nyeem, phau ntawv Vajluskub, thiab lwm yam., PUR kub yaj cov nplaum yuav ua tau raws li cov qauv ntawm cov ntawv no. PUR hot melt adhesives muaj adhesion zoo heev thiab muaj li 50% tsawg dua los yog tsawg tshaj cov pa EVA hot melt adhesives. EVA kub qhuav nplaum yuav tsum ncav cuag lub zog (lub thickness ntawm sab nraum qab ntawm phau ntawv yog raws li daim ntawv thiab lub thickness ntawm phau ntawv). Cov kua nplaum yog tswj ntawm 0.6 thiab 2 hli. Nyob rau hauv tib lub sijhawm, PUR nplaum txheej yuav siv tau tib lub thickness ua EVA kub yaj nplaum, feem ntau ntawm lub thickness txog li 0.3 hli. PUR kub yaj cov kab xev ua ke tsis muaj cov kuab tshuaj, thiab cov txheej txheem tua tsis ua rau tsis muaj kuab paug rau cov thev dej, uas yog lub hom phiaj yav tom ntej ntawm cov phooj ywg zoo.
3. Kev ua tsis ncaj rau daim ntawv thov
Txawm hais tias kev ua tau zoo ntawm cov khoom siv ntawm polyurethane kub yaj ua tau zoo heev, tseem muaj qee cov teeb meem kev teeb meem uas yuav tsum tau daws, xws li: txo qhov kub ntxhov thiab yaj viscosity; txhim kho qhov pib tack; pab kom yooj yim, kub kub thiab nplaim retardancy ntawm cov khoom. Kev khiav hauj lwm thiab kev lag luam ntawm PUR kub yaj nplaum yog siab tshaj qhov ntawm cov tshuaj EVA nplaum. Nws yog ib qho tsim nyog kom tsis txhob sib cuag ntawm cov nplaum thiab cua nyob saum cua. Yog li ntawd, nitrogen yuav tsum tau raug tiv thaiv nyob rau hauv lub preheated yaj tank. Vim tias cov kua nplaum ua ntawv thov kom PUR kub yaj nplaum yuav ua rau tsawg tshaj li ntawm EVA kub qhuav nplaum, khiav ceev ntawm lub tshuab yog tus neeg siab. Thaum lub sij hawm cua sov txheej txheem ntawm PUR kub yaj nplaum, ib qho me me ntawm kev ua kom muaj roj (isocyanate) tej zaum yuav volatilized, uas yuav tsum tau kub tswj thiab qhov cua qhov system. Thaum cov PUR kub yaj yaj tiav thiab kho thiab cov kab sib tw ntawm kev sib txuam ua ke, nws yuav tsis raug reheated thiab melted thiab reused, thiab EVA kub yaj nplaum yuav pheej siv los ua khoom yas.
Plaub, txoj kev loj hlob ntawm cov polyurethane kub yaj nplaum rau phau ntawv
Vim tias qhov kev tshawb fawb zoo ntawm polyurethane kub qhuav yaj hauv lub xyoo 1930, qhov nruab nrab nruab nrab ntawm txoj hnyav ntawm polyurethane kub yaj hauv cov lag luam muaj ntau tshaj 11% hauv 2007, ua qhov thib peb ceev tshaj zom ua rau dej ntws kua nplaum thiab EVA kub melt adhesives.
Txoj kev loj hlob ntawm PUR kub yaj yaj rau bookbinding tseem ceev heev. Txij li thaum xyoo 1980 thiab xyoo 1990, thawj lub cim ntawm PUR hot melt adhesives pib siv rau kev ntim ntawv, tab sis thaum lub sij hawm cov phau ntawv tau ua zoo rau kev ua tiav peb mus rau hnub ua ntej phau ntawv raug txiav, ua tiav thiab thauj. Tsuas pub siv lub tshuab hluav taws xob thaum lub sijhawm, thaum lub sijhawm ua haujlwm yaj, ntau npaum li cas ntawm cov ntxhiab tsw (MDI, TDI) residual residue isocyanate monomer volatilization, uas yog tus cias rau tus neeg teb xov tooj. Nyob rau hauv nruab nrab-mus-lig 1990s, qhov kev ceev ceev ntawm ob lub cim PUR kub yaj yaj ua kom luv luv mus rau peb hnub, thiab lub isocyanate residual monomer tau zoo tswj. Ua kom zoo rau xyoo pua 21st, peb lub cim ntawm kev ya raws txoj kab ua kom ruaj ntseg polyurethane PUR kub yaj nplaum tau ntxiv lawm. Tom qab 30 feeb ntawm phau ntawv cog lus, phau ntawv yuav txiav thiab kho tau li 6 mus rau 6 xuab moos mus ua kom tau qhov zoo tshaj plaws ua ke.
Niaj hnub no, nrog kev loj hlob sai, peb tab tom nrhiav kev ua haujlwm zoo dua qub thiab kev nyab xeeb. Nws yog qhov tseeb tias peb lub cim ntawm PUR kub yaj yaj ntxiv tseem ua tsis tau raws li qhov xav tau. Qee lub tuam txhab ua lag luam zoo tshaj plaws tau ua rau kev ua haujlwm kom tsis txhob muaj lub sij hawm ntawm kev ua kom sov PUR kub yaj. Lub tswv yim ntawm "UV UV humidification" dual-kho PUR kub yaj nplaum npaj siab thiab pib siv nyob rau hauv cov khoom tiag. Qhov no kub yaj nplaum yog ib qho khoom tsim los ntawm UV rau ntawm PUR molecular saw thaum hluav taws xob ntau lawm. Tom qab cov phau ntawv tau kho, UV zog teeb ntawm cov khoom siv thau rau siv los pib lub crosslinking cov tshuaj tiv thaiv ntawm UV monomer tivthaiv hauv PUR kub yaj nplaum, kom lub PUR kub yaj yaj thaum pib tau solidified thiab ces ntxiv reacted nrog cua ya raws. Mus txog rau qhov kho kom zoo. Qhov no PUR kub yaj nplaum yuav ua ke nrog cov cuab yeej siv rau hauv kab ntau lawm thiab txiav cov haujlwm me ntsis. Nws muaj peev xwm ua tau zoo txaus los ntawm 3 feeb, uas yog sib npaug ntawm kev kub ceev ntawm EVA kub yaj. Txawm tias hom PUR kub yaj nplaum nplaum yuav muab los siv rau Lub koob thaij ntawm daim puag ncig nyuaj phau ntawv. Tam sim no, vim yog tus nqi pheej yig ntawm cov khoom lag luam, nws tsis tau txhawb thiab siv. Tab sis kuv ntseeg hais tias yav tom ntej, kev nce qib hauv kev siv cuab yeej technology thiab maturity ntawm cov txheej txheem yuav coj tau tshiab PUR hot melt adhesives uas pheej yig dua thiab zoo dua.
Nrog rau kev kawm ntawm zej zog, tib neeg tab tom nrhiav kev siab dua thiab siab dua kev coj noj coj ua thiab saj. Cov phau ntawv, nyeem ntawv, ntawv xov xwm, thiab lwm yam zoo li yuav ua qauv zoo, tus kheej, ruaj khov, tiv taus kev sau, kev sib tw, thiab kev nyab xeeb. Yog li ntawd, kom tau raws li qhov xav tau ntawm cov neeg, PUR kub yaj yaj ntim tshuab yog qhov kev xaiv zoo tshaj. Nws muaj peev xwm yuav kwv yees tias txo cov nqi ntawm PUR kub yaj nplaum, txhim kho kom yooj yim ntawm kev siv PUR, thiab ua kom qhov kev ywj siab ua raws li kev sib tw ruaj ruaj yog qhov tseem ceeb tshaj plaws rau cov qib PUR.