Lub ntiaj teb ntawm adhesives yog ib qho txaus nyiam, muaj ntau yam khoom siv, kev tsim, thiab kev siv.Ntawm ntau cov khoom uas tsim cov nplaum nplaum, cov khoom ua kom tuab ua lub luag haujlwm tseem ceeb.Cov neeg ua haujlwm no yog lub luag haujlwm rau kev faib cov viscosity thiab kev ruaj ntseg rau cov nplaum, kom ntseeg tau tias nws ua tau zoo nyob rau hauv ntau yam mob thiab adheres zoo rau cov substrates sib txawv.
Taw qhia rau Thickening Agents hauv Adhesives:
Thickening agents, tseem hu ua rheology modifiers lossis viscosity enhancers, yog cov khoom ntxiv rau cov nplaum kom lawv cov viscosity lossis tuab.Lawv ua haujlwm ntau yam tseem ceeb:
Viscosity Control: Thickening agents tswj cov yam ntxwv ntws ntawm cov nplaum, ua kom yooj yim rau kev thov thiab tiv thaiv sagging lossis khiav tom qab thov.
Txhim kho Adhesion: Los ntawm kev nce viscosity, cov neeg ua kom tuab tuaj yeem txhim kho kev sib cuag ntawm cov nplaum thiab substrate, txhim kho cov khoom adhesion.
Kev Tiv Thaiv Kev Tiv Thaiv: Cov neeg ua haujlwm no pab tiv thaiv kom tsis txhob muaj cov khib nyiab thiab ua kom cov khoom sib txawv ntawm cov khoom sib txawv thoob plaws hauv cov txheej txheem nplaum, txhim kho kev ruaj ntseg thiab txee lub neej.
Txhim khu kev ua haujlwm tau zoo: Cov nplaum nplaum nplaum feem ntau yooj yim rau kev tswj thiab tswj thaum siv, muab kev ua haujlwm zoo rau cov neeg siv.
Hom Thickening Agents:
Thickening agents siv rau hauv cov nplaum tuaj yeem muab faib ua ntau pawg raws li lawv cov tshuaj muaj pes tsawg leeg thiab cov txheej txheem ntawm kev ua:
Polymers:
Cellulose Derivatives: Piv txwv xws li hydroxyethyl cellulose (HEC), methyl cellulose (MC), thiab carboxymethyl cellulose (CMC).Cov polymers no yog soluble hauv dej thiab muab cov khoom tuab zoo heev.
Acrylic Polymers: Acrylic thickeners, xws li polyacrylates, muab versatility thiab compatibility nrog ntau yam nplaum formulations.
Polyurethanes: Polyurethane-raws li cov thickeners muab kev ua haujlwm siab ua kom tuab thiab tswj rheological hauv cov kua nplaum raws li cov nplaum.
Inorganic Thickeners:
Clays: Ntuj av nplaum zoo li bentonite thiab montmorillonite feem ntau yog siv los ua cov thickeners hauv dej-raws li nplaum nplaum.Lawv ua haujlwm los ntawm kev tsim cov qauv network uas ua rau kom muaj viscosity.
Silica: Precipitated silica thiab colloidal silica yog siv los ua cov thickeners nyob rau hauv cov nplaum formulations, tshwj xeeb tshaj yog nyob rau hauv silicone-raws li adhesives.
Organic Thickeners:
Xanthan Gum: Muab tau los ntawm microbial fermentation, xanthan cov pos hniav yog ib tug ua tau zoo thickening tus neeg sawv cev haum rau ntau yam ntawm cov nplaum formulations.
Guar Gum: Lwm yam ntuj tsim cov pos hniav, guar gum, yog muab los ntawm guar taum thiab siv feem ntau hauv cov nplaum dej.
Starches: Hloov cov hmoov txhuv nplej siab, xws li pob kws hmoov txhuv nplej siab los yog qos yaj ywm starch, tuaj yeem ua cov thickeners zoo hauv qee cov nplaum nplaum.
Associative Thickeners:
Cov thickeners no ua hauj lwm los ntawm kev sib koom nrog lwm cov molecules nyob rau hauv cov nplaum formulation, tsim ib tug network uas tsub kom viscosity.Piv txwv suav nrog hydrophobically modified polymers (HMPs) thiab polyurethane thickeners nrog pab pawg neeg koom tes.
Factors cuam tshuam rau kev xaiv ntawm Thickening Agents:
Xaiv tus neeg sawv cev thickening txoj cai rau ib qho kev sib xyaw ua ke yuav tsum xav txog ntau yam:
Compatibility: Lub thickener yuav tsum tau sib xws nrog lwm yam khoom ntawm cov nplaum formulation, nrog rau cov kuab tshuaj, resins, thiab additives.
Solubility: Nyob ntawm cov nplaum hom (dej-raws li, hnyav-raws li, los yog kub yaj), cov thickening tus neeg sawv cev yuav tsum tau soluble los yog dispersible nyob rau hauv xaiv hnyav los yog nruab nrab.
Rheological Properties: Qhov xav tau rheological cwj pwm ntawm cov nplaum (shear thinning, thixotropic, thiab lwm yam) coj cov kev xaiv ntawm thickening tus neeg saib xyuas thiab nws cov concentration.
Daim Ntawv Thov: Cov txheej txheem ntawm daim ntawv thov (txhuam, tshuaj tsuag, thiab lwm yam) thiab qhov xav tau daim ntawv thov thickness cuam tshuam qhov kev xaiv ntawm thickener thiab nws cov yam ntxwv viscosity.
Environmental Considerations: Cov kev cai ib puag ncig thiab kev txiav txim siab yuav txwv tsis pub siv qee cov tshuaj thickening, xws li volatile organic compounds (VOCs) nyob rau hauv cov kua nplaum nplaum.
Cov cheeb tsam thov thiab kev txiav txim siab:
Thickening agents pom cov ntawv thov thoob plaws ntau yam kev lag luam thiab hom nplaum:
Kev Siv Adhesives: Cov neeg ua haujlwm tuab feem ntau yog siv rau hauv kev tsim cov nplaum rau cov khoom sib txuas xws li ntoo, hlau, pob zeb, thiab ceramics.Lawv xyuas kom meej qhov sib txawv filling thiab structural kev ncaj ncees.
Ntim Adhesives: Hauv daim ntawv thov ntim, qhov twg cov nplaum yog siv rau kev sib khi thiab sib txuas cov duab los qhia, ntawv, thiab cov yas, cov khoom ua kom tuab muab viscosity tswj thiab tiv thaiv kev nyem tawm thaum thov.
Automotive Adhesives: Automotive adhesives xav tau kev tswj xyuas kom meej rau cov ntawv thov xws li lub cev vaj huam sib luag, kev sib dhos sab hauv, thiab kev teeb tsa lub tshuab cua.
Woodworking Adhesives: Ntoo nplaum thiab cov nplaum siv hauv kev ua haujlwm ntoo tau txais txiaj ntsig los ntawm cov neeg ua kom tuab kom ua tiav cov ntawv cog lus muaj zog thiab tiv thaiv kom tsis txhob poob los yog khiav thaum siv.
Kev Kho Mob Adhesives: Hauv daim ntawv thov kev kho mob xws li cov ntaub qhwv lub qhov txhab, cov ntaub qhwv cov ntaub so ntswg, thiab cov nplaum phais, cov neeg ua kom cov tawv nqaij ua kom cov adhesion thiab biocompatibility.
Thickening agents yog cov khoom tseem ceeb ntawm cov nplaum nplaum, muab kev tswj viscosity, ruaj khov, thiab txhim kho kev ua haujlwm thoob plaws ntau yam kev siv.Kev xaiv ntawm txoj cai thickener nyob ntawm yam xws li compatibility, solubility, rheological zog, thiab daim ntawv thov yuav tsum tau.Nrog kev nce qib txuas ntxiv hauv cov ntaub ntawv tshawb fawb thiab thev naus laus zis thev naus laus zis, kev txhim kho ntawm cov neeg ua haujlwm thickening tshiab cog lus tias yuav ntxiv dag zog rau kev ua haujlwm thiab ntau yam ntawm cov nplaum hauv ntau qhov kev lag luam.Raws li daim ntawv nplaum txuas ntxiv mus ntxiv kom tau raws li qhov xav tau ntawm kev tsim khoom niaj hnub no thiab kev tsim kho, lub luag haujlwm ntawm cov neeg ua haujlwm thickening tseem yog qhov tseem ceeb hauv kev ua kom muaj kev vam meej thiab kev ntseeg siab ntawm cov nplaum nplaum kev daws teeb meem.
Lub sij hawm xa tuaj: Mar-29-2024