Dab tsi yog PVB yas

Polyvinyl Butyral Resin (PVB) yog ib qho hnyav-raws li resin synthesized los ntawm acetal cov tshuaj tiv thaiv ntawm polyvinyl cawv (PVA) thiab butyraldehyde nyob rau hauv qhov kev txiav txim ntawm ib tug catalyst.

Vim hais tias PVB resin muaj ib tug loj feem ntawm hydroxyl pawg, nws muaj peev xwm txuas nrog ib co thermosetting resins los txhim kho tshuaj tiv thaiv thiab hardness ntawm txheej zaj duab xis.


Vim tias cov khoom zoo no, PVB resins tau siv dav hauv cov yeeb yaj kiab interlayer rau cov iav kev nyab xeeb hauv tsheb thiab cov tsev, xeb inhibiting primers, ci lacquers, ntoo lacquers, luam ntawv inks, adhesives rau hluav taws xob ceramics thiab luam Circuit Court boards, adhesives ntawm hlau thiab hlau. , hlau thiab yas, modifiers rau kub yaj nplaum, thiab waterproofing rau textiles. Cov ntawv thov tshiab hauv ntau qhov kev lag luam tau txuas ntxiv tsim thiab siv.

Cov yam ntxwv ntawm PVB yog raws li hauv qab no.

Cov tsos ntawm polyvinyl butyral (PVB) resin yog dawb spherical ntxeem tau hais los yog hmoov, thiab nws lub ntiajteb txawj nqus yog 1: 1; Txawm li cas los xij, qhov ntim ntim tsuas yog 0.20 ~ 0.35g / ml.

Thermal Properties

Lub iav hloov kub (Tg) ntawm polyvinyl butyral (PVB) resin ranges ntawm 50 ° C rau qis recombination mus rau 90 ° C rau siab recombination; Cov iav hloov qhov kub no kuj tuaj yeem hloov kho kom qis dua 10 ° C los ntawm kev ntxiv cov khoom tsim nyog ntawm plasticizer.

Mechanical Properties

Txheej zaj duab xis ntawm polyvinyl butyral (PVB) resin muaj cov dej tsis zoo, tsis kam thiab roj tsis kam (tiv taus rau aliphatic, ntxhia, tsiaj thiab zaub roj, tab sis tsis ua rau cov roj sesame roj). PVB yog dav siv nyob rau hauv luam ntawv inks thiab coatings vim hais tias nws muaj hydroxyl pawg thiab muaj zoo dispersion ntawm pigments.

Tsis tas li ntawd, nws cov qauv tshuaj muaj xws li hydrophobic acetal thiab acetate pawg thiab hydrophilic hydroxyl pawg, yog li PVB muaj adhesion zoo rau iav, hlau, yas, tawv thiab ntoo.

Tshuaj tiv thaiv

Txhua yam tshuaj uas tuaj yeem cuam tshuam nrog cov cawv thib ob kuj yuav ua rau PVB. Yog li ntawd, nyob rau hauv ntau daim ntawv thov, PVB feem ntau ua ke nrog thermosetting resins los txuas cov hydroxyl pawg PVB kom ua tiav cov tshuaj tiv thaiv, hnyav tsis kam thiab dej tsis kam.

Tau kawg, nyob ntawm seb hom thermosetting resin thiab qhov sib xyaw ua ke nrog PVB, cov khoom sib txawv (xws li hardness, toughness, impact resistance, etc.) ntawm txheej zaj duab xis tuaj yeem tsim.

Cov khoom muaj kev nyab xeeb

Pure PVB tsis muaj tshuaj lom thiab tsis muaj teeb meem rau tib neeg lub cev, thiab nws tuaj yeem siv los ua cov kuab tshuaj nrog ethyl acetate lossis cawv, yog li PVB tau siv dav los ua luam ntawv number case rau ntim khoom noj thiab ntim yas hauv Tebchaws Europe thiab Asmeskas.

Kev ruaj ntseg ruaj ntseg

PVB tuaj yeem khaws cia rau ob xyoos yam tsis muaj kev cuam tshuam rau nws qhov zoo yog tias nws tsis tuaj yeem cuam tshuam ncaj qha nrog dej; PVB yuav tsum muab cia rau hauv qhov chaw qhuav thiab txias thiab tiv thaiv los ntawm tshav ntuj ncaj qha.

Solubility

PVB yog soluble hauv cawv, ketones, esters thiab lwm yam kuab tshuaj. Lub solubility ntawm ntau cov kuab tshuaj sib txawv nyob ntawm seb muaj pes tsawg leeg ntawm cov pab pawg ua haujlwm ntawm PVB. Feem ntau hais lus, cawv yog soluble, tab sis methanol yog ntau insoluble nyob rau hauv siab acetal pawg; qhov siab dua cov acetal pawg, ntau soluble nws yog nyob rau hauv ketone thiab ester solvents.

PVB yog soluble hauv cawv ether (Cellosolve) cov kuab tshuaj; PVB tsuas yog ib nrab soluble hauv cov kuab tshuaj tsw qab xws li xylene thiab toluene; PVB yog insoluble hauv hydrocarbon solvents.

Cov yam ntxwv viscosity ntawm PVB kev daws teeb meem

Feem ntau, yog tias cov cawv siv los ua cov kuab tshuaj, qhov hnyav molecular ntawm cov cawv, qhov viscosity ntawm PVB ntau dua.

Cov kuab tshuaj tsw qab xws li xylene thiab toluene thiab cov kuab tshuaj hydrocarbon tuaj yeem siv los ua cov diluents los txo cov viscosity ntawm PVB cov ntsiab lus. Cov nyhuv ntawm cov tshuaj lom neeg muaj pes tsawg leeg ntawm PVB ntawm viscosity yog cov ntsiab lus hauv qab no: qhov siab dua ntawm polymerization, qhov siab dua qhov viscosity ntawm cov tshuaj nrog tib cov kuab tshuaj thiab tib cov ntsiab lus ntawm txhua pab pawg; qhov siab dua ntawm acetal pawg lossis acetate pawg, qhov qis dua qhov viscosity ntawm cov tshuaj nrog tib cov kuab tshuaj thiab tib qib ntawm polymerization.

Dissolution method of PVB

Thaum siv cov kuab tshuaj sib xyaw, cov txheej txheem kev sib cais yog muab cov kuab tshuaj tsw qab (xws li xylene, toluene, thiab lwm yam) los yog cov kuab tshuaj ester (xws li n-butyl acetate, ethyl acetate, thiab lwm yam) rau hauv PVB maj mam nrog nplawm, thiab tom qab ntawd ntxiv cov kuab tshuaj cawv. (piv txwv li n-butanol, ethanol, thiab lwm yam) tom qab PVB dispersed thiab o.

Nyob rau hauv cov ntaub ntawv no, lub sij hawm dissolution yuav luv luv los ntawm kev ua kom kub; Los ntawm kev siv txoj kev sib cais no, cov pob zoo li PVB tuaj yeem zam tau (vim tias lub sijhawm tawg yuav ntev dua ob peb zaug tom qab tsim cov pob zoo li PVB), thiab yog li qhov tawg nrawm tuaj yeem nrawm dua. General aromatic thiab cawv hnyav piv piv 60/40 rau 40/60 (qhov hnyav piv), tuaj yeem sib xyaw nrog cov tshuaj viscosity PVB.

Cov kuab tshuaj muaj pes tsawg leeg muaj 2 ~ 3wt% dej, uas tuaj yeem txhim kho hydrogen bonding ntawm cawv hnyav thiab pab cov solubility ntawm PVB.

Cov khoom ua haujlwm

Txawm hais tias PVB resin yog cov thermoplastic, nws yuav luag tsis muaj kev ua haujlwm ua ntej ntxiv cov yas, tab sis ib zaug ntxiv plasticizer, nws cov txheej txheem ua tau yooj yim heev.

Rau cov txheej txheem dav dav thiab cov ntaub nplaum nplaum, cov khoom siv yas tau ntxiv los hloov cov khoom siv los ua kom tau raws li daim ntawv thov, xws li zaj duab xis softness, txo Tg point ntawm resin, txo cov cua sov sealing kub, thiab tswj tsis tshua muaj kub softness.

Compatability

PVB yog sib xws nrog ntau yam resins xws li phenolic resins, epoxy resins, alkyd resins thiab melamine resins.

PVB thiab alkyd resins yog ib feem sib xws. Hom PVB thiab qis molecular hnyav epoxy resin tuaj yeem sib xws, thaum siab molecular hnyav epoxy resin yuav tsum xaiv qib siab acetal PVB kom sib haum.