Polyisobutylene (PIB)yog ib yam khoom tsis muaj xim, tsis muaj saj, tsis muaj tshuaj lom tuab lossis ib nrab khoom, tiv taus cua sov, tiv taus oxygen, tiv taus ozone, tiv taus huab cua, tiv taus ultraviolet, tiv taus acid thiab alkali thiab lwm yam tshuaj lom neeg ua tau zoo. Polyisobutylene yog ib hom isobutylene homopolymer tsis muaj xim, tsis muaj ntxhiab, tsis muaj tshuaj lom. Vim yog cov txheej txheem npaj sib txawv thiab cov xwm txheej thev naus laus zis, cov nqi ntawm polyisobutylene sib txawv ntau yam. Feem ntau ntawm qhov hnyav molecular ntawm cov khoom ncav cuag ntau dua 10,000 txog 200,000 yuav hloov pauv los ntawm cov kua tuab mus rau ib nrab khoom, thiab tom qab ntawd hloov mus rau roj hmab zoo li elastomer. Polyisobutylene tiv taus acid, alkali, ntsev, dej, ozone thiab kev laus, thiab muaj huab cua zoo heev thiab rwb thaiv tsev hluav taws xob.
Cov khoom siv tshuaj lom neeg:Tsis muaj xim rau cov kua daj daj lossis cov roj hmab semisolid (qhov hnyav molecular qis yog gelatinous mos, qhov hnyav molecular siab yog ductile thiab elastic). Tag nrho tsis muaj ntxhiab, tsis muaj ntxhiab lossis me ntsis ntxhiab tsw. Qhov nruab nrab molecular hnyav yog 200,000 ~ 87 lab. Yaj hauv benzene thiab diisobutyl Chemicalbook, tuaj yeem sib xyaw nrog polyvinyl acetate, wax, thiab lwm yam, tsis yaj hauv dej, cawv thiab lwm yam polar solvents. Nws tuaj yeem ua rau cov pos hniav qab zib muaj qhov mos zoo heev ntawm qhov kub qis, thiab muaj qee yam plasticity ntawm qhov kub siab los ua kom tiav qhov tsis zoo ntawm polyvinyl acetate thaum nws txias, kub huab cua thiab ntau dhau softening thaum nws ntsib qhov kub ntawm qhov ncauj.
Cov ntawv thov:PIB paub txog nws cov khoom zoo heev rau kev sib khi thiab nplaum, uas feem ntau siv rau hauv cov nplaum, cov tshuaj pleev xim, thiab cov tshuaj sealants. PIB cov khoom zoo li roj hmab ua rau nws yog qhov kev xaiv zoo heev rau kev sib khi thiab kev sib txuas, vim nws pab muab kev sib txuas ruaj khov thiab ruaj khov hauv ntau qhov chaw. Ntxiv nrog rau nws txoj kev siv tau zoo, PIB feem ntau siv rau hauv cov tshuaj pleev ib ce thiab cov khoom siv tu tus kheej vim nws cov khoom yaj tau zoo heev. Cov tshuaj no feem ntau yog sib xyaw nrog lwm cov khoom xyaw los tsim cov khoom nrog cov qauv thiab kev xav tshwj xeeb.
PIB muaj ntau yam kev siv hauv kev lag luam zaub mov thiab. Cov tshuaj no feem ntau siv ua cov khoom ua kom tuab, cov khoom ruaj khov, thiab cov khoom ua kom emulsifier hauv cov zaub mov ua tiav. PIB kuj tseem tuaj yeem pab txhim kho cov qauv thiab kev sib xws ntawm cov khoom xws li ice cream, chewing gum, thiab cov khoom ci. Qhov ua tau ntau yam ntawm PIB ua rau nws yog cov khoom xyaw tseem ceeb rau cov chaw tsim khoom hauv kev lag luam zaub mov.
PIB kuj siv dav hauv kev lag luam kho mob. Cov khoom tsis muaj tshuaj lom ua rau nws zoo tagnrho rau kev siv hauv kev siv kho mob. Cov khoom no feem ntau siv ua cov khoom ruaj khov hauv cov tshuaj tiv thaiv kab mob, nrog rau cov khoom xyaw hauv ntau cov tshuaj. PIB qhov xwm txheej hydrophobic pab nws lo rau ntawm daim tawv nqaij, ua rau nws muaj txiaj ntsig zoo hauv kev tsim cov nplaum kho mob.
Cov yam ntxwv:Polyisobutylene muaj cov khoom siv tshuaj lom neeg ntawm cov tshuaj hydrocarbon saturated, thiab cov saw methyl pawg yog tightly symmetrical faib, uas yog ib qho polymer tshwj xeeb. Lub xeev sib sau ua ke thiab cov khoom ntawm polyisobutylene nyob ntawm nws qhov hnyav molecular thiab kev faib tawm ntawm qhov hnyav molecular. Thaum qhov nruab nrab viscosity molecular hnyav yog nyob rau hauv qhov ntau ntawm 70000 ~ 90000, polyisobutylene hloov pauv los ntawm cov kua tig mus rau cov khoom elastic. Feem ntau, raws li qhov loj ntawm qhov hnyav molecular ntawm polyisobutylene yog muab faib ua cov koob hauv qab no: qhov hnyav molecular qis polyisobutylene (tus lej nruab nrab molecular hnyav = 200-10000); qhov nruab nrab molecular hnyav polyisobutylene (tus lej nruab nrab molecular hnyav = 20000-45,000); qhov hnyav molecular siab polyisobutylene (tus lej nruab nrab molecular hnyav = 75,000-600,000); qhov hnyav molecular siab heev polyisobutylene (tus lej nruab nrab molecular hnyav ntau dua 760000).
1. Cua nruj
Ib qho ntawm cov yam ntxwv zoo tshaj plaws ntawm polyisobutylene yog nws qhov cua nruj zoo heev. Vim muaj ob pawg methyl hloov pauv, qhov kev txav mus los ntawm cov saw hlau molecular qeeb thiab qhov ntim dawb yog me me. Qhov no ua rau muaj qhov sib txawv me me thiab cov pa permeability.
2. Kev yaj tau
Polyisobutylene yaj tau hauv aliphatic hydrocarbon, aromatic hydrocarbon, roj av, naphthene, roj av, chlorinated hydrocarbon thiab carbon monosulfide. Ib feem yaj hauv cov cawv thiab cheese siab dua, lossis o hauv cov cawv, ethers, monomers, ketones thiab lwm yam kuab tshuaj thiab roj tsiaj thiab zaub, qib ntawm o nce nrog rau qhov nce ntawm cov kuab tshuaj carbon saw ntev; Insoluble hauv cov cawv qis dua (xws li methanol, ethanol, isopropyl cawv, ethylene glycol thiab coethylene glycol), ketones (xws li acetone, methyl ethyl ketone) thiab glacial acetic acid.
3. Kev tiv thaiv tshuaj lom neeg
Polyisobutylene tiv taus cov kua qaub thiab alkali. Xws li ammonia, hydrochloric acid, 60% hydrofluoric acid, lead acetate aqueous solution, 85% phosphoric acid, 40% sodium hydroxide, saturated salt water, 800} sulfuric acid, 38% sulfuric acid + 14% nitric acid erosion, Txawm li cas los xij, nws tsis tuaj yeem tiv taus qhov erosion ntawm cov oxidants muaj zog, cov oxidants kub tsis muaj zog (xws li 60% potassium permanganate), qee cov organic acids kub concentrated (xws li 373K acetic acid) thiab halogens (fluorine, chlorine, suab puam).
Ntim: 180KG nruas
Kev Khaws Cia: Khaws cia rau qhov chaw txias, cua nkag tau, thiab qhuav nrog kev tiv thaiv hnub thaum lub sijhawm thauj mus los.
Xaus lus, PIB yog ib yam khoom muaj nqis uas muaj ntau yam kev siv hauv ntau yam lag luam. Nws cov khoom zoo heev rau kev sib khi thiab nplaum, nrog rau nws cov dej yaj thiab kev hloov pauv tau yooj yim, ua rau nws zoo tagnrho rau kev siv hauv kev lag luam tshuaj pleev ib ce, kev saib xyuas tus kheej, khoom noj, thiab kev kho mob. Ua tus neeg muab khoom tseem ceeb ntawm PIB, peb mob siab rau kev muab cov khoom lag luam thiab cov kev pabcuam zoo tshaj plaws rau peb cov neeg siv khoom kom tau raws li lawv cov kev xav tau hauv kev lag luam.
Lub sijhawm tshaj tawm: Lub Rau Hli-19-2023