Polyacrylamideyog ib qho khoom siv dav siv hauv kev lag luam ntawv. Polyacrylamide (PAM), raws li cov dej-soluble polymer, muaj zoo heev flocculation, thickening, dispersion thiab lwm yam khoom. Yuav siv tau rau ntau yam txheej txheem sib txawv. Hauv kev lag luam papermaking, PAM plays lub luag haujlwm tseem ceeb. Nws tau coj cov txiaj ntsig kev lag luam tseem ceeb rau kev lag luam papermaking los ntawm kev txhim kho cov khoom ntawm cov tawv nqaij thiab nce kev ua haujlwm ntawm cov tshuab ntawv. Kab lus no yuav tham txog kev nthuav dav ntawm daim ntawv thov ntawm polyacrylamide hauv kev tsim cov ntawv thiab nws cov txiaj ntsig ntawm kev txhim kho kev tsim khoom.
Cov yam ntxwv tseem ceeb thiab kev ua haujlwm ntawm polyacrylamide
Polyacrylamide yog lub siab molecular polymer uas tau muab faib ua nonionic, anionic, cationic thiab amphoteric hom raws li nws cov nqi zog. Thaum PAM dissolves nyob rau hauv dej, thiab nws cov saw hlau ntev molecular qauv ua rau nws muaj kev ua haujlwm zoo xws li flocculation, thickening, kev pab tuav, thiab kev pab pom. Hauv kev lag luam ntawv, polyacrylamide feem ntau yog siv hauv cov hauv qab no:
1. Kev pab tuav pov hwm:
PAM molecules muaj cov qauv saw ntev thiab tuaj yeem ua rau adsorbed rau ntawm cov fibers thiab cov fillers los tsim cov choj. Li no txhim kho tus nqi khaws cia ntawm fillers thiab fibers ntawm daim ntawv web. Txo cov fiber ntau hauv dej dawb thiab txo cov khoom siv raw. Los ntawm kev nce tus nqi khaws cia ntawm cov fillers thiab fibers, daim ntawv lub cev muaj zog xws li smoothness, printability, thiab lub zog tuaj yeem txhim kho.
2. Kev pab lim:
Txhim kho qhov dewatering kev ua tau zoo ntawm cov ntaub so ntswg, ua kom cov txheej txheem dej pom sai thiab txo kev siv zog.
3. Flocculant:
Ua kom sludge lub cev qhuav dej: PAM tuaj yeem ua tau zoo flocculate me me fibers, fillers thiab lwm yam teeb meem tshem tawm hauv cov ntaub so ntswg los ua cov khoom loj loj, ua kom cov sludge daws thiab lub cev qhuav dej, thiab txo cov nqi kho sludge.
Txhim kho dej zoo: PAM tuaj yeem tshem tawm cov khib nyiab pov tseg thiab cov organic hauv cov dej khib nyiab, txo BOD thiab COD hauv cov dej khib nyiab, txhim kho cov dej zoo, thiab txo cov pa phem ib puag ncig.
4. Dispersant:
Tiv thaiv fiber ntau agglomeration: PAM tuaj yeem tiv thaiv fiber ntau agglomeration hauv cov ntaub so ntswg, txhim kho cov ntaub ntawv sib xws, thiab txhim kho cov ntawv zoo.
Kev siv ntawm polyacrylamide hauv papermaking technology
1. Pulp npaj theem
Thaum lub sij hawm kev npaj pulp, cov fibers zoo thiab cov khoom ntim tau yooj yim ploj nrog cov dej khib nyiab, ua rau cov khoom pov tseg thiab ib puag ncig muaj kuab lom. Siv cationic polyacrylamide ua ib qho kev pab khaws cia tuaj yeem ntes thiab txhim kho cov fibers me me thiab muab tso rau hauv cov tawv nqaij los ntawm kev them nqi nruab nrab thiab kev sib txuas. Qhov no tsis tsuas yog txo qhov poob ntawm fibers, tab sis kuj txo qhov kev thauj khoom ntawm cov dej phwj tuaj kho.
2. Daim ntawv tshuab ntub kawg system
Hauv daim ntawv tshuab ntub dej kawg, lub cev qhuav dej sai yog tus yuam sij rau kev txhim kho kev tsim khoom. Anionic lossis nonionic polyacrylamide tuaj yeem siv los ua kev lim dej kom yooj yim rau cov dej kom khiav tawm ntawm cov qauv fiber ntau los ntawm kev txhim kho cov flocculation ntawm fibers. Cov txheej txheem no txo qis lub sij hawm lub cev qhuav dej thaum txo lub zog noj thaum lub sij hawm ziab.
3. Papermaking theem
Raws li ib tug dispersant, polyacrylamide tuaj yeem tiv thaiv fiber ntau flocculation thiab txhim kho cov uniformity thiab smoothness ntawm daim ntawv. Los ntawm kev ua tib zoo xaiv qhov hnyav molecular thiab nqi ceev ntawm PAM, lub cev lub cev ntawm cov ntawv tiav, xws li lub zog tensile thiab lub zog tsim kua muag, kuj tuaj yeem ua kom zoo dua. Tsis tas li ntawd, polyacrylamide tuaj yeem txhim kho cov nyhuv txheej ntawm cov ntawv coated thiab ua kom cov ntawv luam tawm ntawm daim ntawv zoo dua.
Cov txiaj ntsig tseem ceeb ntawm polyacrylamide hauv kev txhim kho kev tsim khoom
1. Txo cov khoom poob
Kev siv cov khoom tuav tuav tau zoo txhim kho tus nqi khaws cia ntawm cov fibers zoo thiab muab tso rau hauv cov ntaub so ntswg, txo cov khoom siv raw, thiab ncaj qha txuag cov nqi tsim khoom.
2. Ceev cov txheej txheem lub cev qhuav dej
Kev taw qhia txog cov khoom siv lim dej ua rau cov txheej txheem dewatering ntau dua, yog li ua kom cov ntawv tshuab ua haujlwm ceev thiab ua kom lub voj voog ntau lawm. Qhov no tsis yog tsuas yog ua kom muaj peev xwm tsim tau ib leeg xwb, tab sis kuj txo qis kev siv hluav taws xob.
3. Txo cov dej khib nyiab siab
Los ntawm kev txhim kho cov nyhuv flocculation, polyacrylamide tuaj yeem txo cov ntsiab lus ntawm cov khib nyiab tshem tawm hauv cov dej khib nyiab, txo cov khoom siv dej phwj tuaj ntawm qhov chaw thiab txo cov nqi tiv thaiv ib puag ncig ntawm kev lag luam.
4. Txhim kho daim ntawv zoo
Kev siv cov dispersants ua rau cov fiber ntau ntawm cov ntawv sib txawv, txhim kho lub cev thiab pom cov khoom ntawm daim ntawv, thiab txhim kho kev lag luam kev sib tw ntawm cov khoom.
Cov yam ntxwv cuam tshuam rau kev siv cov nyhuv ntawm polyacrylamide
Txhawm rau muab kev ua si tag nrho rau kev ua haujlwm ntawm polyacrylamide, cov hauv qab no yuav tsum tau tsom mus rau:
1. PAM qauv xaiv
Cov txheej txheem ua ntawv sib txawv thiab hom ntawv muaj cov kev xav tau sib txawv rau qhov hnyav molecular thiab nqi ceev ntawm PAM. Siab molecular hnyav PAM yog haum rau flocculation thiab lim pab, thaum tsis tshua muaj molecular hnyav PAM yog haum rau dispersion.
2. Ntxiv tus nqi thiab ntxiv txoj kev
Tus nqi ntawm PAM ntxiv yuav tsum tau tswj kom meej. Cov nyiaj ntau dhau tuaj yeem ua rau muaj kev cuam tshuam tsis zoo, xws li cuam tshuam rau lub cev qhuav dej lossis nce nqi ntau lawm. Nyob rau tib lub sijhawm, yuav tsum siv txoj kev sib cais sib cais sib cais kom tsis txhob muaj kev sib sau hauv zos uas cuam tshuam rau cov nyhuv.
3. Cov txheej txheem txheej txheem
Kub, pH thiab dej txhua yam cuam tshuam rau PAM kev ua haujlwm. Piv txwv li, cationic PAM ua haujlwm zoo tshaj plaws nyob rau hauv nruab nrab rau me ntsis acidic tej yam kev mob, thaum anionic PAM yog haum rau alkaline ib puag ncig.
Raws li cov khoom siv ntau ntxiv hauv kev lag luam papermaking, polyacrylamide plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev tsim khoom, txo cov nqi tsim khoom thiab txhim kho cov khoom zoo nrog nws cov flocculation zoo, tuav, pom thiab dispersion zog. Hauv kev siv tswv yim, cov tuam txhab yuav tsum xaiv thiab ua kom zoo dua cov kev siv ntawm PAM raws li lawv tus kheej cov txheej txheem thiab xav tau kom ua tiav cov txiaj ntsig zoo tshaj plaws ntawm kev lag luam thiab ib puag ncig.
Post lub sij hawm: Nov-28-2024
