Kawm txog Pilot Test ntawm Kev Tsim Khoom ntawm PVC Resin los ntawm Hydroxypropyl Methyl Cellulose

Cov txheej txheem tsim khoom ntawm HPMC hauv tsev tau qhia, thiab lub luag haujlwm tseem ceeb ntawm HPMC hauv tsev hauv cov txheej txheem tsim khoom ntawm PVC thiab nws cov kev cuam tshuam rau qhov zoo ntawm PVC cob tau kawm hauv qhov kev sim. Cov txiaj ntsig qhia tau tias:①Kev ua tau zoo ntawm HPMC hauv tsev yog qhov zoo heev, thiab kev ua haujlwm ntawm PVC resin tsim yog sib npaug rau qhov zoo ntawm PVC resin ua los ntawm cov khoom HPMC tuaj txawv teb chaws;②Thaum HPMC hauv tsev siv hauv PVC ntau lawm, PVC tuaj yeem txhim kho thiab kho kom zoo los ntawm kev kho hom thiab tus nqi ntawm HPMC Kev ua haujlwm ntawm cov khoom siv cob;③Hauv tsev HPMC yog qhov tsim nyog rau kev tsim ntau yam xoob PVC resins. Cov khoom siv PVC ua rau muaj cov zaj duab xis nyias thiab lub teeb ua rau lub hwj;④Cov khoom siv HPMC hauv tsev tuaj yeem hloov cov khoom HPMC tuaj.

Cov lus tseem ceeb:PVC; dispersant; Hydroxypropyl methylcellulose yog ib qho khoom siv zoo

Kev tsim cov HPMC nrog cov paj rwb zoo nyob rau hauv txawv teb chaws tau pib xyoo 1960, thiab kuv lub teb chaws pib tsim HPMC thaum ntxov xyoo 1970. Vim muaj kev txwv ntawm cov cuab yeej siv, thev naus laus zis thiab lwm yam, qhov zoo tsis tuaj yeem ruaj khov, thiab cov tsos yog fibrous. Vim li no, HPMC xav tau los ntawm PVC resin kev lag luam, kev lag luam tshuaj, khoom siv hauv tsev high-end, tshuaj pleev ib ce, hlau, zaub mov thiab lwm yam kev lag luam tag nrho tso siab rau kev xa khoom, feem ntau yog los ntawm Tebchaws Meskas thiab Nyij Pooj, thiab HPMC raug rau txawv teb chaws monopoly. . Xyoo 1990, Ministry of Chemical Industry tau teeb tsa cov koom haum cuam tshuam los sib koom ua ke daws cov teeb meem tseem ceeb, thiab tsim cov khoom lag luam uas ua tau raws li cov kev xav tau zoo ntawm PVC, paub txog kev ua haujlwm ntawm HPMC. Nyob rau hauv xyoo tas los no, cov tuam txhab HPMC zoo heev hauv tsev tau ruaj khov tsim lub tswv yim ntawm kev tsim kho tshiab, kev sib koom tes, ntsuab, qhib, thiab sib koom, hais rau kev tsim kho tshiab-tsav, thiab ua tiav txoj kev loj hlob zoo los ntawm kev ywj pheej innovation, kev loj hlob, thiab kev hloov pauv sai. ntawm qub thiab tshiab kinetic zog. Tshaj tawm los ntawm Tuam Tshoj Petroleum thiab Chemical Industry Federation, GB / T 34263-2017 "Hydroxypropyl Methyl Fiber rau Kev Siv Hluav Taws Xob", uas tau raug xaiv los ntawm Tuam Tshoj Chemical Standardization Technical Committee thiab tau pom zoo los ntawm chav tsev tsim qauv, tau tshaj tawm xyoo 2017, thiab nws tau tshaj tawm thoob tebchaws lub Plaub Hlis 1, 2018. tau ua tiav. Txij thaum ntawd los, muaj cov qauv rau cov tuam txhab PVC los yuav thiab siv cov khoom HPMC.

1. Refined paj rwb zoo

30 # refined paj rwb yog nyob rau hauv cov duab zoo fibers nyob rau hauv lub microscope. Cov paj rwb uas paub tab muaj ntau pua ntawm crystallized hauv paus ntsiab lus fibers nyob rau hauv nws cov ntoo khaub lig seem, thiab cov ntsiab lus fibers yog aggregated mus rau pua pua ntawm bundled fibers. Cov fibers no Ib cov paj rwb fiber ntau yog helically coiled nyob rau hauv concentric txheej. Qhov no yog qhov tsim nyog rau kev tsim cov alkalized cellulose thiab qhov sib xws ntawm etherification degree, thiab yog qhov tsim nyog rau kev txhim kho cov kua nplaum tuav ntawm HPMC thaum lub sij hawm PVC polymerization.

30 # refined paj rwb siv paj rwb linters nrog siab loj hlob thiab tsis tshua muaj polymerization degree raws li raw khoom, cov txheej txheem ntau lawm yog nyuaj, nws yuav tsum tau purified, thiab cov nqi ntau lawm yog siab. 1000 # refined paj rwb siv paj rwb linters nrog siab loj hlob thiab qib siab ntawm polymerization raws li raw khoom, cov txheej txheem ntau lawm tsis nyuaj, thiab cov nqi ntau lawm yog tsawg. Yog li ntawd, 30 # refined paj rwb yog siv los tsim cov khoom siv high-end xws li PVC resin / tshuaj / khoom noj, thiab 1000 # refined paj rwb yog siv los tsim cov ntaub ntawv hauv tsev lossis lwm daim ntawv thov.

2. Qhov xwm txheej, qauv thiab cov txheej txheem tsim khoom ntawm HPMC cov khoom

2.1 Cov khoom ntawm HPMC cov khoom

HPMCyog ib qho tsis muaj tshuaj lom, tsis muaj ntxhiab, tsis qab los yog tawm-dawb fibrous lossis granular hmoov ua los ntawm ntuj refined paj rwb ua cov khoom siv tseem ceeb. Nws yog semi-synthetic, inactive, viscoelastic polymer, non-ionic hom compounds. Cov npe suav suav yog hydroxymethyl propyl cellulose, cellulose hydroxypropyl methyl ether, thiab hypromellose, thiab cov mis molecular yog [C6H7O2(OH)2COOR]n.

Lub melting point ntawm HPMC yog 225-230°C, qhov ceev yog 1.26-1.31 g / cm3³, qhov txheeb ze molecular loj yog li 22,000, carbonization kub yog 280-300°C, thiab qhov nro saum npoo yog 42-56 mN / m (2% aqueous tov).

Lub cev thiab tshuaj lom neeg ntawm HPMC feem ntau suav nrog cov ntsiab lus hauv qab no.

(1) Particle loj Performance index: HPMC particle loj Performance index rau PVC resin muaj siab xav tau. Pass tus nqi ntawm 150μm yog ntau dua 98.5%, thiab tus nqi dhau ntawm 187μm yog 100%. Qhov kev xav tau tshwj xeeb tshwj xeeb yog nyob nruab nrab ntawm 250 thiab 425μm.

(2) Solubility: soluble nyob rau hauv qee cov kuab tshuaj xws li dej thiab cawv, dej-soluble thiab muaj kev ua haujlwm saum npoo av. High transparency, ruaj khov kev ua tau zoo ntawm cov kev daws teeb meem, sib txawv specifications ntawm cov khoom muaj txawv gel kub, solubility hloov nrog viscosity, qhov qis viscosity, ntau dua solubility, txawv specifications ntawm HPMC muaj tej yam txawv nyob rau hauv kev ua tau zoo, thiab solubility nyob rau hauv dej yog tsis. cuam ​​tshuam los ntawm tus nqi pH.

Solubility nyob rau hauv dej txias thiab dej kub yog txawv. Cov khoom uas muaj cov ntsiab lus methoxyl siab yog insoluble hauv dej kub siab tshaj 85°C, cov khoom uas muaj cov ntsiab lus methoxyl nruab nrab yog insoluble hauv dej kub siab tshaj 65°C, thiab cov khoom uas muaj cov ntsiab lus methoxyl tsawg yog insoluble hauv dej kub siab tshaj 65°C. Cov dej kub siab tshaj 60°C. Ordinary HPMC yog insoluble nyob rau hauv organic solvents xws li ethanol, ether, thiab chloroform, tab sis soluble nyob rau hauv 10% mus rau 80% ethanol aqueous tov los yog ib tug sib tov ntawm methanol thiab dichloromethane. HPMC muaj qee yam hygroscopicity. Thaum 25°C / 80% RH, qhov sib npaug ntawm qhov nqus dej yog 13%, thiab nws ruaj khov heev hauv qhov chaw qhuav thiab pH tus nqi ntawm 3.0-11.0.

(3) HPMC muaj cov yam ntxwv zoo ntawm kev soluble hauv dej txias tab sis insoluble hauv dej kub. Muab HPMC tso rau hauv dej txias thiab nplawm nws tuaj yeem yaj tag thiab tig mus rau hauv cov kua pob tshab. Qee cov khoom lag luam yog qhov yooj yim insoluble hauv dej kub tshaj 60°C, thiab tsuas tuaj yeem o. Cov cuab yeej no tuaj yeem siv rau kev ntxuav thiab ntxuav, uas tuaj yeem txo cov nqi, txo cov pa phem, thiab ua kom muaj kev ruaj ntseg ntau lawm. Nrog rau qhov txo qis ntawm cov ntsiab lus methoxyl, qhov gel point ntawm HPMC nce, cov dej solubility txo, thiab cov dej ua haujlwm kuj txo.

(4) HPMC yog siv los ua ib qho stabilizer thiab dispersant nyob rau hauv lub polymerization ntawm vinyl chloride thiab vinylidene. Nws tuaj yeem siv ua ke nrog polyvinyl cawv (PVA) los yog ntawm nws tus kheej, thiab tuaj yeem tswj cov khoom zoo thiab cov khoom sib faib.

(5) HPMC kuj muaj zog enzyme tsis kam, thermal gel zog (dej kub saum 60°C tsis yaj, tab sis tsuas yog swells), zoo heev zaj duab xis-forming zog, pH nqi stability (3.0-11.0), dej tuav thiab ntau lwm yam ntxwv.

Raws li cov yam ntxwv zoo saum toj no, HPMC tau siv dav hauv kev lag luam xws li tshuaj, kev lag luam petrochemical, kev tsim kho, ceramics, textile, khoom noj khoom haus, tshuaj niaj hnub, hluavtaws cob, txheej thiab electronics.

2.2 HPMC khoom qauv

Qhov piv ntawm cov ntsiab lus methoxyl thiab hydroxypropyl cov ntsiab lus hauv HPMC cov khoom sib txawv, cov viscosity txawv, thiab cov khoom ua tau zoo sib txawv.

2.3 Cov txheej txheem tsim khoom ntawm HPMC cov khoom

HPMC siv cov paj rwb refined cellulose ua cov ntaub ntawv tseem ceeb, thiab ua cov paj rwb hmoov los ntawm crushing kev kho mob. Muab cov paj rwb hmoov tso rau hauv ib lub taub dej polymerization, disperse nws li ntawm 10 npaug ntawm cov kuab tshuaj (toluene, isopropanol ua cov kuab tshuaj sib xyaw), thiab ntxiv rau Lye (cov zaub mov qib caustic soda yog yaj hauv dej kub ua ntej), propylene oxide, methyl chloride etherification tus neeg sawv cev, etherification cov tshuaj tiv thaiv yog nqa tawm ntawm qhov kub thiab txias, thiab cov khoom siv tshuaj tiv thaiv yog nruab nrab nrog cov kua qaub, hlau tshem tawm, ntxuav thiab qhuav, thiab thaum kawg tau txais HPMC.

3. Daim ntawv thov ntawm HPMC hauv PVC ntau lawm

3.1 Txoj cai ntawm kev ua

Daim ntawv thov ntawm HPMC raws li ib tug dispersant nyob rau hauv PVC industrial ntau lawm yog txiav txim los ntawm nws cov qauv molecular. Nws tuaj yeem pom los ntawm cov qauv molecular ntawm HPMC tias cov qauv qauv ntawm HPMC muaj ob qho tib si hydrophilic hydroxypropyl (-OCH-CHOHCH3) pab pawg ua haujlwm thiab ib pawg lipophilic methoxyl (-OCH,) ua haujlwm. Nyob rau hauv vinyl chloride ncua kev kawm ntawv polymerization, cov dispersant yog mas concentrated nyob rau hauv lub interface txheej ntawm lub monomer droplet-dej theem, thiab teem nyob rau hauv xws li ib txoj kev uas lub hydrophilic ntu ntawm dispersant txuas mus rau theem dej, thiab lipophilic ntu txuas mus rau lub monomer. poob dej. Hauv HPMC, ntu hydroxypropyl-based yog ntu hydrophilic, uas feem ntau faib rau hauv cov dej theem; methoxy-raws li ntu yog ntu lipophilic, uas feem ntau faib rau hauv theem monomer. Tus nqi ntawm lipophilic ntu faib nyob rau theem monomer cuam tshuam rau qhov loj me me, qib ntawm kev sib sau, thiab porosity ntawm cov resin. Qhov siab dua cov ntsiab lus ntawm lipophilic ntu, qhov muaj zog tiv thaiv kev tiv thaiv ntawm cov ntsiab lus tseem ceeb, qhov me me ntawm cov ntsiab lus ntawm cov khoom sib xyaw ua ke, thiab cov resin porosity ntawm cov resin nce thiab pom meej qhov ntom ntom; Qhov siab dua cov ntsiab lus ntawm cov ntu hydrophilic, qhov tsis muaj zog tiv thaiv kev tiv thaiv ntawm cov ntsiab lus tseem ceeb, qhov ntau dua ntawm kev sib sau ua ke ntawm cov ntsiab lus tseem ceeb, qhov porosity ntawm cov resin qis dua, thiab qhov siab dua qhov pom tseeb. Tsis tas li ntawd, kev tiv thaiv cov nyhuv ntawm cov dispersant muaj zog heev. Nrog rau qhov nce ntawm cov viscosity ntawm cov tshuaj tiv thaiv polymerization, ntawm qhov kev hloov pauv ntau dua, kev sib txuas ntawm cov khoom siv tau yooj yim tshwm sim, ua rau cov khoom tsis zoo; Cov nyhuv tiv thaiv ntawm cov dispersant tsis muaj zog heev, thiab cov ntsiab lus tseem ceeb Nws yog ib qho yooj yim rau coalesce nyob rau theem ntawm kev hloov pauv qis nyob rau theem pib ntawm polymerization, yog li tsim cov resin nrog cov duab tsis zoo.

Nws tau raug pov thawj los ntawm kev xyaum hais tias ntxiv HPMC thiab lwm yam dispersants rau lub ncua kev kawm ntawv polymerization ntawm vinyl chloride yuav txo tau lub interfacial nro ntawm vinyl chloride thiab dej nyob rau hauv thawj theem ntawm polymerization. Stable dispersion nyob rau hauv cov dej nruab nrab, cov nyhuv no yog hu ua dispersion peev xwm ntawm dispersant; Ntawm qhov tod tes, cov pab pawg lipophilic ua haujlwm ntawm cov dispersant adsorbed rau ntawm qhov chaw ntawm cov yas chloride droplet tsim cov txheej txheem tiv thaiv kom tsis txhob sib sau ua ke ntawm cov yas chloride droplet. Lub droplet plays lub luag hauj lwm ntawm stabilization thiab kev tiv thaiv, uas yog hu ua lub colloid retention muaj peev xwm ntawm dispersant. Uas yog, nyob rau hauv lub ncua kev kawm ntawv polymerization system, lub dispersant plays ob lub luag hauj lwm ntawm dispersing thiab tiv thaiv lub colloidal stability.

3.2 Kev soj ntsuam kev ua haujlwm ntawm daim ntawv thov

PVC resin yog ib qho khoom particle hmoov. Nws cov yam ntxwv particle (xws li nws cov duab particle, particle loj thiab kev faib tawm, microstructure thiab pore loj thiab kev faib tawm, thiab lwm yam) feem ntau cuam tshuam rau kev ua haujlwm ntawm plastics thiab cov khoom ua tau zoo, thiab txiav txim siab PVC. Muaj ob yam uas muaj kev cuam tshuam loj tshaj plaws ntawm cov yam ntxwv ntawm cov khoom siv resin:①Lub nplawm ntawm lub tank polymerization, cov khoom siv tau ruaj khov, thiab cov yam ntxwv nplawm yog qhov tsis hloov pauv;②Lub dispersant system ntawm cov monomer nyob rau hauv cov txheej txheem polymerization, uas yog, yuav ua li cas xaiv hom, qib thiab npaum li cas yog qhov tseem ceeb tshaj plaws variable tswj cov khoom ntawm PVC resin pellets.

Los ntawm cov resin granulation mechanism nyob rau hauv lub ncua kev kawm ntawv polymerization txheej txheem, nws yog paub hais tias ntxiv ib tug dispersant ua ntej cov tshuaj tiv thaiv tsuas yog pab kom stabilize lub monomer roj droplets tsim los ntawm stirring thiab tiv thaiv kev sib nrig sib polymerization thiab merging ntawm cov roj droplets. Yog li ntawd, cov nyhuv dispersion ntawm cov dispersant yuav cuam tshuam rau cov khoom tseem ceeb ntawm polymer resin.

Lub peev xwm khaws cia colloid ntawm cov dispersant muaj kev sib raug zoo nrog viscosity lossis molecular hnyav. Qhov ntau dua qhov viscosity ntawm cov tshuaj aqueous, qhov siab dua qhov hnyav molecular, thiab qhov siab dua lub zog ntawm cov yeeb yaj kiab tiv thaiv adsorbed ntawm vinyl chloride-dej theem interface, qhov tsis tshua muaj cov zaj duab xis rupture thiab grain coarsening.

Cov tshuaj aqueous ntawm cov dispersant muaj kev ua haujlwm ntawm lub ntsej muag, qhov me me ntawm qhov nro, qhov siab dua qhov kev ua haujlwm saum npoo, qhov zoo dua cov roj monomer cov dej tsim, qhov me dua qhov pom tseeb qhov ntom ntawm cov khoom tau txais, thiab cov xoob thiab ntau ntxeem tau.

Nws tau raug lees paub los ntawm kev sim kev tshawb fawb tias qhov kev sib tshuam ntawm HPMC yog qhov me me hauv cov kev daws teeb meem aqueous dispersant ntawm gelatin, PVA, thiab HPMC ntawm tib qhov concentration, uas yog, qhov me me ntawm qhov nro, qhov siab dua qhov kev ua haujlwm ntawm HPMC hauv. vinyl chloride suspension polymerization system, uas qhia tau hais tias Lub zog muaj peev xwm dispersing ntawm HPMC dispersant. Piv nrog rau nruab nrab thiab siab viscosity PVA dispersants, qhov nruab nrab tus txheeb ze molecular hnyav ntawm HPMC (kwv yees 22 000) yog ntau me dua li ntawm PVA (txog 150 000), uas yog, cov nplaum tuav kev ua tau zoo ntawm HPMC dispersants tsis zoo li ntawd. ntawm PVA.

Qhov saum toj no theoretical thiab tswv yim tsom xam qhia tau hais tias HPMC tuaj yeem siv los tsim ntau hom kev ncua PVC resins. Piv nrog PVA nrog rau qib ntawm alcoholysis ntawm 80%, nws muaj cov kua nplaum tsis muaj zog thiab muaj peev xwm tawg tau zoo dua;.Piv nrog rau 5% PVA, cov kua nplaum tuav lub peev xwm thiab muaj peev xwm dispersion yog sib npaug. HPMC yog siv los ua dispersant, thiab resin particles uas tsim los ntawm HPMC muaj tsawg "zaj duab xis" cov ntsiab lus, tsis zoo li qub ntawm resin hais, finer particle loj, siab nqus ntawm resin ua plasticizers, thiab yeej tsis tshua nplaum rau lub kettle, vim nws tsis yog. -tshuaj lom thiab yooj yim Tsim kho qib resins nrog siab clarity.

Raws li saum toj no theoretical thiab tswv yim ntau lawm tsom xam, HPMC thiab PVA, raws li lub ntsiab dispersants rau ncua kev kawm ntawv polymerization, yeej muaj peev xwm ua tau raws li qhov zoo ntawm cov khoom resin, tab sis nws yog ib qho nyuaj heev kom tau raws li qhov yuav tsum tau ntawm cov nplaum tuav lub peev xwm thiab interfacial kev ua si nyob rau hauv polymerization. ntau lawm. Vim tias ob qho tib si muaj lawv tus yam ntxwv, txhawm rau tsim cov khoom lag luam zoo, feem ntau cov tuam txhab siv cov tshuab sib xyaw nrog cov peev txheej sib txawv thiab cov dej num cuam tshuam, uas yog, PVA thiab HPMC composite dispersant systems, kom ua tiav cov txiaj ntsig ntawm kev kawm los ntawm txhua tus. lwm yam.

3.3 Kev sib piv zoo ntawm HPMC hauv tsev thiab txawv teb chaws

Cov txheej txheem ntsuas kub ntawm gel yog npaj cov tshuaj aqueous nrog ib feem ntawm 0.15%, ntxiv rau lub raj xim xim, ntxig rau tus pas ntsuas kub, maj mam ua kom sov thiab do maj mam, thaum cov tshuaj zoo li milky dawb filamentous gel yog qhov qis dua ntawm lub gel kub, txuas ntxiv kom sov thiab do, thaum cov tshuaj tag nrho hloov milky dawb yog lub siab txwv ntawm lub gel kub.

3.4 Lub xeev ntawm cov qauv sib txawv ntawm HPMC hauv tsev thiab txawv teb chaws nyob rau hauv lub tshuab tsom

Cov duab ntawm ntau hom HPMC nyob rau hauv lub microscope tuaj yeem pom:①Txawv teb chaws E50 thiab domestic 60YT50 HPMC ob leeg tam sim no ib tug aggregated qauv nyob rau hauv lub microscope, cov qauv molecular ntawm domestic 60YT50HPMC yog compact thiab uniform, thiab cov qauv molecular ntawm txawv teb chaws E50 yog dispersed;②Lub xeev sib sau ua ke ntawm domestic 60YT50 HPMC Cov qauv muaj peev xwm theoretically txo qhov kev sib tshuam ntawm cov vinyl chloride thiab dej, thiab pab vinyl chloride kom disperse uniformly thiab stably nyob rau hauv cov dej nruab nrab, uas yog, vim hais tias cov hydroxypropyl ntsiab lus ntawm 60YT50 HPMC yog me ntsis siab, nws ua rau nws ntau hydrophilic, thaum ES0 Vim yog cov ntsiab lus siab ntawm methoxyl pawg, theoretically, nws muaj zog roj hmab tuav kev ua tau zoo;③tiv thaiv kev sib koom ua ke ntawm vinyl chloride droplets nyob rau theem pib ntawm cov txheej txheem polymerization;④tiv thaiv kev sib koom ua ke ntawm cov khoom polymer hauv nruab nrab thiab tom qab theem ntawm cov txheej txheem polymerization. Cov qauv sib sau ua ke feem ntau kawm txog kev sib koom ua ke ntawm cellulose molecules (crystalline thiab amorphous cheeb tsam, qhov loj thiab daim ntawv ntawm chav tsev cell, daim ntawv ntim ntawm molecular chains hauv chav tsev cell, qhov loj ntawm crystallites, thiab lwm yam), cov qauv kev taw qhia ( molecular saw thiab Orientation ntawm microcrystals), thiab lwm yam, yog qhov tsim nyog rau tag nrho cov grafting cov tshuaj tiv thaiv ntawm refined paj rwb thaum lub sij hawm etherification, thiab txhim kho lub intrinsic zoo thiab stability ntawm HPMC.

3.5 Lub Xeev ntawm HPMC aqueous tov hauv tsev thiab txawv teb chaws

Lub tsev thiab txawv teb chaws HPMC tau npaj rau hauv 1% aqueous tov, thiab lub teeb xa hluav taws xob ntawm domestic 60YT50 HPMC yog 93%, thiab cov neeg txawv teb chaws E50 HPMC yog 94%, thiab tsis muaj qhov sib txawv ntawm lub teeb kis ntawm ob.

Cov khoom HPMC hauv tsev thiab txawv teb chaws tau tsim rau hauv 0.5% aqueous tov, thiab cov tshuaj tom qab HPMC cellulose tau yaj lawm. Nws tuaj yeem pom los ntawm qhov muag liab qab tias qhov pom tseeb ntawm ob qho tib si yog qhov zoo heev, meej thiab pob tshab, thiab tsis muaj qhov loj ntawm cov fiber ntau insoluble, uas qhia tau hais tias qhov zoo ntawm HPMC imported thiab domestic HPMC zoo dua. Lub teeb xa hluav taws xob siab ntawm cov tshuaj qhia tau hais tias HPMC reacts tag nrho nyob rau hauv tus txheej txheem ntawm alkalization thiab etherification, tsis muaj ib tug loj npaum li cas ntawm impurities thiab insoluble fibers. Ua ntej, nws tuaj yeem txheeb xyuas qhov zoo ntawm HPMC. Cov kua dej dawb thiab cua npuas.

4. HPMC dispersant application pilot test

Txhawm rau kom paub meej ntxiv txog qhov kev ua tau zoo ntawm kev ua haujlwm hauv tsev HPMC hauv cov txheej txheem polymerization thiab nws cov kev cuam tshuam rau qhov zoo ntawm PVC cob, R&D pab pawg ntawm Shandong Yiteng New Materials Co., Ltd. siv cov khoom HPMC hauv tsev thiab txawv teb chaws ua cov khoom tawg, thiab hauv tsev HPMC. thiab imported PVA li dispersants. Qhov zoo ntawm cov resins npaj los ntawm ntau hom HPMC raws li dispersants nyob rau hauv Tuam Tshoj tau sim thiab muab piv, thiab daim ntawv thov cov nyhuv ntawm HPMC nyob rau hauv PVC resin yog soj ntsuam thiab sib tham.

4.1 Pilot test process

Cov tshuaj tiv thaiv polymerization tau nqa tawm hauv 6 m3 polymerization kettle. Txhawm rau tshem tawm cov kev cuam tshuam ntawm monomer zoo ntawm PVC resin zoo, cov nroj tsuag pilot siv txoj kev calcium carbide los tsim cov vinyl chloride monomer, thiab cov dej ntsiab lus ntawm cov monomer yog tsawg dua 50.×10-6. Tom qab lub tshuab nqus tsev ntawm polymerization kettle yog tsim nyog, ntxiv cov ntsuas vinyl chloride thiab ion-dawb dej rau lub polymerization kettle, thiab tom qab ntawd ntxiv cov dispersant thiab lwm yam additives uas yuav tsum tau los ntawm cov mis rau hauv lub hwj nyob rau tib lub sij hawm tom qab hnyav. Tom qab ua ntej stirring rau 15 feeb, dej kub ntawm 90°C tau nkag mus rau hauv lub tsho, rhuab mus rau lub polymerization kub kom pib cov tshuaj tiv thaiv polymerization, thiab cov dej txias tau nkag rau hauv lub tsho tib lub sijhawm, thiab cov tshuaj tiv thaiv kub tau tswj los ntawm DCS. Thaum lub siab ntawm polymerization kettle poob mus rau 0.15 MPa, qhov hloov pauv ntawm polymerization nce mus txog 85% mus rau 90%, ntxiv cov terminator los txiav tawm cov tshuaj tiv thaiv, rov ua kom cov vinyl chloride, sib cais thiab ziab kom tau PVC resin.

4.2 Pilot test ntawm domestic 60YT50 thiab txawv teb chaws E50 HPMC resin ntau lawm

Los ntawm kev sib piv cov ntaub ntawv zoo ntawm domestic 60YT50 thiab txawv teb chaws E50 HPMC los tsim PVC resin, nws yuav pom tau hais tias lub viscosity thiab plasticizer nqus ntawm domestic 60YT50 HPMC PVC resin zoo ib yam li cov khoom ntawm txawv teb chaws HPMC cov khoom, nrog tsawg volatile teeb meem, zoo nws tus kheej. -sufficiency, Tus nqi tsim nyog yog 100%, thiab ob qho tib si nyob ze ntawm cov khoom zoo. Cov ntsiab lus methoxyl ntawm txawv teb chaws E50 yog me ntsis siab dua li ntawm domestic 60YT50 HPMC, thiab nws cov roj hmab tuav kev ua tau zoo. Cov tau txais PVC resin yog me ntsis zoo dua li HPMC dispersants nyob rau hauv cov nqe lus ntawm plasticizer absorption thiab pom meej ntom.

4.3 Domestic 60YT50 HPMC thiab imported PVA siv los ua dispersant los tsim resin pilot test

4.3.1 Zoo ntawm PVC cob ua

PVC cob yog tsim los ntawm domestic 60YT50 HPMC thiab imported PVA dispersant. Cov ntaub ntawv sib piv zoo tuaj yeem pom: siv tib yam zoo 60YT50HPMC thiab imported PVA dispersant system los tsim PVC resin feem, vim hais tias 60YTS0 HPMC dispersant muaj zog dispersion muaj peev xwm thiab zoo roj hmab tuav kev ua tau zoo. Nws tsis zoo li PVA dispersion system. Qhov pom tseeb ntom ntom ntawm PVC resin tsim los ntawm 60YTS0 HPMC dispersion system yog me ntsis qis dua li ntawm PVA dispersant, cov yas nqus tau zoo dua, thiab qhov nruab nrab qhov loj me ntawm cov resin yog finer. Cov txiaj ntsig kev xeem tuaj yeem cuam tshuam txog ntau yam yam ntxwv ntawm 60YT50 HPMC thiab cov tshuab xa tawm PVA dispersant, thiab tseem muaj kev cuam tshuam qhov zoo thiab qhov tsis zoo ntawm ob qhov dispersants los ntawm kev ua haujlwm ntawm PVC resin. Nyob rau hauv cov nqe lus ntawm microstructure, nto zaj duab xis ntawm HPMC dispersant resin Nyias, cov resin yog yooj yim rau plasticize thaum lub sij hawm ua.

4.3.2 Zaj duab xis ntawm PVC resin hais nyob rau hauv electron microscope

Saib xyuas qhov microstructure ntawm cov khoom siv cob, cov khoom siv resin uas tsim los ntawm HPMC dispersant muaj lub ntsej muag me me "film" thickness; cov resin hais ua los ntawm PVA dispersant muaj thicker microscopic "film". Tsis tas li ntawd, rau cov tuam txhab calcium carbide resin nrog cov ntsiab lus siab ntawm vinyl chloride monomer impurities, txhawm rau kom muaj kev ruaj ntseg ntawm cov qauv txheej txheem, lawv yuav tsum tau nce tus nqi ntawm cov dispersant, uas ua rau muaj kev nce hauv qhov chaw deposits ntawm resin hais. thiab thickening ntawm "film". Plasticizing kev ua tau zoo yog qhov tsis zoo.

4.4 Kev sim ntawm cov qib sib txawv ntawm HPMC los tsim PVC cob

4.4.1 Zoo ntawm PVC cob ua

Siv ntau qib hauv tsev ntawm HPMC (nrog cov viscosities sib txawv thiab cov ntsiab lus hydroxypropyl) ua ib qho kev sib cais, tus nqi ntawm cov dispersant yog 0.060% ntawm vinyl chloride monomer, thiab ncua kev kawm polymerization ntawm vinyl chloride yog nqa tawm ntawm 56.5.° C kom tau qhov nruab nrab particle loj, pom meej ntom ntom, thiab plasticizer nqus ntawm PVC resin.

Nws tuaj yeem pom los ntawm qhov no tias:①Piv nrog 65YT50 HPMC dispersion system, 75YT100 muaj viscosity ntawm 65YT50 HPMC tsawg dua 75YT100HPMC, thiab cov ntsiab lus hydroxypropyl tseem tsawg dua 75YT100HPMC, thaum cov ntsiab lus methoxyl yog siab dua 75YMCT10. Raws li theoretical tsom xam ntawm dispersants, viscosity thiab hydroxypropyl Qhov txo qis ntawm lub hauv paus ntsiab lus yuav inevitably ua rau txo qis ntawm cov dispersing muaj peev xwm ntawm HPMC, thiab qhov nce ntawm cov ntsiab lus methoxy yuav txhawb kev txhim kho cov nplaum tuav lub peev xwm ntawm cov dispersant, uas yog, 65YT50 HPMC dispersion system yuav ua rau qhov nruab nrab particle loj ntawm PVC resin nce (coarse particle loj), qhov pom tseeb ceev nce thiab cov plasticizer nqus tau nce;②Piv nrog rau 60YT50 HPMC dispersion system, cov ntsiab lus hydroxypropyl ntawm 60YT50 HPMC yog ntau dua li ntawm 65YT50 HPMC, thiab cov ntsiab lus methoxy ntawm ob yog nyob ze thiab siab dua. Raws li txoj kev xav dispersant, qhov siab dua cov ntsiab lus ntawm hydroxypropyl, lub zog muaj peev xwm ntawm cov dispersing, yog li lub peev xwm dispersing ntawm 60YT50 HPMC yog txhim kho; Nyob rau tib lub sijhawm, ob lub ntsiab lus methoxyl nyob ze thiab cov ntsiab lus siab dua, cov kua nplaum tuav lub peev xwm kuj tseem muaj zog, Hauv 60YT50 HPMC thiab 65YT50 HPMC dispersion systems ntawm tib yam zoo, PVC resin tsim los ntawm 60YT50HPMC dua li 65YT50 HPMC dispersion. lub kaw lus yuav tsum muaj qhov nruab nrab me me me me (qhov loj me me) thiab qhov pom tseeb qis dua, vim tias cov ntsiab lus methoxyl nyob rau hauv cov txheej txheem dispersion yog ze rau (cov roj hmab tuav kev ua tau zoo), uas ua rau cov plasticizer zoo sib xws. Qhov no kuj yog vim li cas vim li cas 60YT50 HPMC feem ntau yog siv rau hauv PVC resin kev lag luam thaum xaiv PVA thiab HPMC composite dispersants. Tau kawg, txawm tias 65YT50 HPMC yog qhov tsim nyog siv rau hauv cov qauv sib xyaw ua ke yuav tsum tau txiav txim siab raws li cov cim qhia zoo.

4.4.2 Particle morphology ntawm PVC resin hais nyob rau hauv microscope

Lub particle morphology ntawm PVC resin ua los ntawm 2 yam ntawm 60YT50 HPMC dispersants nrog sib txawv hydroxypropyl thiab methoxyl cov ntsiab lus nyob rau hauv lub microscope tuaj yeem pom: nrog rau qhov nce ntawm hydroxypropyl thiab methoxyl cov ntsiab lus, lub peev xwm dispersion ntawm HPMC, tuav cov kua nplaum muaj peev xwm txhim kho. Piv nrog rau 60YT50 HPMC (8.7% hydroxypropyl pawg feem, 28.5% methoxyl pawg feem), cov PVC resin particles ua tau li niaj zaus, tsis muaj tailing, thiab cov hais yog xoob.

4.5 Cov nyhuv ntawm 60YT50 HPMC ntau npaum li cas ntawm qhov zoo ntawm PVC cob

Kev sim ntsuas siv 60YT50 HPMC ua ib qho kev sib cais nrog ib feem ntawm pawg methoxyl ntawm 28.5% thiab ib feem ntawm pawg hydroxypropyl ntawm 8.5%. Qhov nruab nrab qhov loj me, pom meej ntom ntom, thiab cov yas nqus dej ntawm PVC tau los ntawm kev nqa tawm kev ncua polymerization ntawm vinyl chloride ntawm 5°C.

Nws tuaj yeem pom tau tias vim tias cov khoom tawg tau nce ntxiv, cov tuab ntawm cov txheej txheem dispersant adsorbed ntawm cov tee dej nce, uas txhim kho cov kev ua haujlwm tawg thiab cov nplaum tuav lub peev xwm ntawm cov dispersant, uas ua rau txo qis hauv qhov nruab nrab particle loj ntawm PVC. resin thiab qhov txo qis hauv qhov chaw saum npoo av. Qhov pom tseeb qhov ceev nce thiab qhov nqus ntawm plasticizer txo qis.

5 Kev xaus

(1) Daim ntawv thov kev ua tau zoo ntawm PVC resin npaj los ntawm domestic HPMC cov khoom tau mus txog qib ntawm cov khoom zoo sib xws.

(2) Thaum HPMC siv los ua ib qho dispersant, nws tseem tuaj yeem tsim cov khoom siv PVC nrog cov ntsuas zoo dua.

(3) Piv nrog PVA dispersant, HPMC thiab PVA dispersant, ob hom additives tsuas yog siv los ua dispersant los tsim cov resin, thiab cov cim qhia resin uas tsim muaj lawv tus kheej zoo thiab qhov tsis zoo. HPMC dispersant muaj qhov ua haujlwm siab saum npoo thiab muaj zog monomer roj droplet dispersing kev ua tau zoo. Nws muaj qhov ua tau zoo ib yam li PVA 72 .5% alcoholysis degree zoo ib yam.

(4) Raws li cov xwm txheej zoo ib yam, cov qib sib txawv ntawm HPMC muaj cov ntsiab lus sib txawv ntawm methoxyl thiab hydroxypropyl, uas muaj qhov sib txawv siv los kho qhov zoo ntawm PVC resin. 60YT50 HPMC dispersant muaj kev ua haujlwm zoo dua li 65YT50 HPMC vim nws cov ntsiab lus hydroxypropyl siab; 65 TSI 50 HPMC Vim muaj cov ntsiab lus methoxy siab ntawm cov dispersant, cov roj hmab tuav kev ua tau zoo dua li ntawm 60YT50HPMC.

(5) Feem ntau hauv kev tsim cov PVC resin, tus nqi ntawm 60YT50HPMC dispersant siv yog qhov sib txawv, thiab kev hloov kho ntawm qhov zoo thiab kev ua haujlwm ntawm PVC resin kuj muaj kev hloov pauv. Thaum qhov ntau npaum li cas ntawm 60YT50 HPMC dispersant nce, qhov nruab nrab particle loj ntawm PVC resin txo, qhov pom tseeb ceev nce, thiab plasticization. Tus nqi nqus ntawm tus neeg sawv cev txo qis, thiab vice versa.

Tsis tas li ntawd, piv nrog PVA dispersant, HPMC yog siv los tsim cov khoom lag luam resin series, uas qhia tau hais tias zoo elasticity thiab ruaj khov rau cov tsis xws li polymerization kettle hom, ntim, nplawm, thiab lwm yam. kettle, thiab txo cov resin nto zaj duab xis Thickness, non-toxic resin, siab thermal stability, txhim khu transparency ntawm resin downstream processing khoom, thiab lwm yam. Tsis tas li ntawd, domestic HPMC yuav pab PVC manufacturers txo nqi ntau lawm, txhim kho kev lag luam kev sib tw, thiab coj zoo. nyiaj txiag pab.