Abstract: Kev siv cov khoom siv hauv tsevhydroxypropyl methylcellulosees tsis txhob xa tawm ib qho los tsim cov PVC uas muaj qib polymerization siab tau qhia. Cov teebmeem ntawm ob hom hydroxypropyl methylcellulose rau cov khoom ntawm PVC uas muaj qib polymerization siab tau tshawb xyuas. Cov txiaj ntsig tau qhia tias nws ua tau los hloov cov hydroxypropyl methyl cellulose hauv tebchaws rau cov khoom xa tuaj.
Cov tshuaj PVC uas muaj polymerization siab yog hais txog cov tshuaj PVC uas muaj qhov nruab nrab polymerization ntau dua 1,700 lossis muaj cov qauv sib txuas me ntsis ntawm cov molecule, uas feem ntau yog cov tshuaj PVC uas muaj qhov nruab nrab polymerization ntawm 2,500 [1]. Piv nrog cov tshuaj PVC ib txwm muaj, cov tshuaj PVC uas muaj polymerization siab muaj kev ywj pheej siab, teeb tsa me me, tiv taus cua sov zoo, tiv taus kev laus, tiv taus qaug zog thiab tiv taus hnav. Nws yog cov roj hmab zoo tagnrho thiab siv tau rau hauv cov ntawv kaw tsheb, cov xov hlau thiab cov cables, cov catheters kho mob, thiab lwm yam. [2].
Txoj kev tsim cov PVC nrog qib siab ntawm polymerization yog feem ntau yog kev ncua polymerization [3-4]. Hauv kev tsim cov txheej txheem ncua, cov dispersant yog ib qho tseem ceeb pabcuam tus neeg sawv cev, thiab nws hom thiab qhov ntau yuav cuam tshuam ncaj qha rau cov duab ntawm cov khoom me me, kev faib tawm ntawm cov khoom me me, thiab kev nqus cov yas ntawm cov khoom tiav PVC resin. Cov txheej txheem dispersion feem ntau siv yog polyvinyl cawv systems thiab hydroxypropyl methylcellulose thiab polyvinyl cawv composite dispersion systems, thiab cov chaw tsim khoom hauv tsev feem ntau siv qhov kawg [5].
1 Cov ntaub ntawv tseem ceeb thiab cov lus qhia
Cov khoom siv raw tseem ceeb thiab cov lus qhia siv hauv kev xeem tau qhia hauv Rooj 1. Nws tuaj yeem pom los ntawm Rooj 1 tias cov hydroxypropyl methylcellulose hauv tebchaws xaiv hauv daim ntawv no yog sib xws nrog cov hydroxypropyl methylcellulose xa tuaj, uas muab qhov yuav tsum tau ua ua ntej rau kev xeem hloov pauv hauv daim ntawv no.
2 Cov ntsiab lus sim
2. 1 Kev npaj cov tshuaj hydroxypropyl methylcellulose
Siv ib qho dej deionized, muab tso rau hauv lub thawv thiab ua kom sov txog 70 ° C, thiab maj mam ntxiv hydroxypropyl methylcellulose rau hauv qab kev sib xyaw tas li. Thaum xub thawj, cov cellulose ntab rau ntawm dej, thiab tom qab ntawd maj mam tawg mus txog thaum nws sib xyaw zoo. Txias cov tshuaj kom txaus.
Rooj 1 Cov khoom siv raw tseem ceeb thiab lawv cov lus qhia
| Lub npe ntawm cov khoom siv raw | Cov Lus Qhia Tshwj Xeeb |
| Vinyl chloride monomer | Qhov qhab nia zoo ≥ 99. 98% |
| Cov dej uas tau lim dej | Kev coj ua ≤10.0 μs/cm2, tus nqi pH 5.00 txog 9.00 |
| Polyvinyl cawv A | Qib Alcohollysis 78. 5% txog 81. 5%, cov tshauv content≤0. 5%, volatile matter≤5. 0% |
| Polyvinyl cawv B | Qib Alcohollysis 71. 0% txog 73. 5%, viscosity 4. 5 txog 6. 5mPa s, volatile matter ≤ 5. 0% |
| Polyvinyl cawv C | Qib Alcohollysis 54. 0% txog 57. 0%, viscosity 800 ~ 1 400mPa s, cov khoom khov 39. 5% txog 40. 5% |
| Cov khoom siv hydroxypropyl methylcellulose A uas tau xa tawm los ntawm txawv teb chaws | Viscosity 40 ~ 60 mPa s, methoxyl pawg feem 28% ~ 30%, hydroxypropyl pawg feem 7% ~ 12%, noo noo ≤5. 0% |
| Cov tshuaj hydroxypropyl methylcellulose B hauv tsev | Viscosity 40 ~ 60 mPa s, methoxyl pawg feem 28% ~ 30%, hydroxypropyl pawg feem 7% ~ 12%, noo noo ≤5. 0% |
| Bis (2-ethylhexyl peroxydicarbonate) | Feem pua ntawm pawg [ (45 ~ 50) ± 1]% |
2. 2 Txoj kev sim
Ntawm lub cuab yeej sim me me 10 L, siv cov hydroxypropyl methyl cellulose uas xa tuaj los ua cov kev sim ntsuas kom paub txog cov mis yooj yim ntawm qhov kev sim me me; siv cov hydroxypropyl methyl cellulose hauv tsev los hloov cov hydroxypropyl methyl cellulose uas xa tuaj rau kev sim; Cov khoom lag luam PVC resin uas tsim los ntawm cov hydroxypropyl methyl cellulose sib txawv tau muab piv rau kev kawm txog kev hloov pauv ntawm cov hydroxypropyl methyl cellulose hauv tsev. Raws li cov txiaj ntsig ntawm qhov kev sim me me, kev sim ntau lawm tau ua tiav.
2. 3 Cov kauj ruam sim
Ua ntej qhov tshuaj tiv thaiv, ntxuav lub lauj kaub polymerization, kaw lub qhov hauv qab, ntxiv qee qhov dej desalinated, thiab tom qab ntawd ntxiv cov tshuaj dispersant; kaw lub hau ntawm lub lauj kaub, nqus tsev tom qab dhau qhov kev sim siab nitrogen, thiab tom qab ntawd ntxiv vinyl chloride monomer; tom qab txias do, ntxiv cov initiator; Siv cov dej ncig kom nce qhov kub hauv lub lauj kaub mus rau qhov kub ntawm qhov tshuaj tiv thaiv, thiab ntxiv cov kua ammonium bicarbonate raws sijhawm thaum lub sijhawm no los kho qhov pH ntawm lub kaw lus tshuaj tiv thaiv; thaum qhov siab ntawm qhov tshuaj tiv thaiv poob rau qhov siab teev tseg hauv cov mis, ntxiv cov neeg sawv cev xaus thiab cov neeg sawv cev defoaming, thiab tso tawm Cov khoom tiav ntawm PVC resin tau txais los ntawm centrifugation thiab ziab, thiab kuaj rau kev tsom xam.
2. 4 Txoj kev tshuaj xyuas
Raws li cov txheej txheem xeem cuam tshuam hauv tus qauv lag luam Q31 / 0116000823C002-2018, tus lej viscosity, qhov pom tseeb, cov khoom tsis haum (suav nrog dej) thiab kev nqus dej yas ntawm 100 g PVC resin ntawm cov PVC resin tiav lawm tau sim thiab soj ntsuam; Qhov nruab nrab ntawm cov khoom me me ntawm PVC resin tau sim; cov morphology ntawm cov khoom me me PVC resin tau pom siv lub tshuab scanning electron microscope.
3 Cov Txiaj Ntsig thiab Kev Sib Tham
3. 1 Kev tshuaj xyuas sib piv ntawm qhov zoo ntawm cov khoom sib txawv ntawm PVC resin hauv kev ua polymerization me me
Nias 2. Raws li txoj kev sim uas tau piav qhia hauv 4, txhua pawg ntawm cov khoom siv PVC me me tiav lawm tau raug sim, thiab cov txiaj ntsig tau qhia hauv Rooj 2.
Cov txiaj ntsig ntawm Rooj 2 ntawm cov pawg sib txawv ntawm kev sim me me
| Pawg | Hydroxypropyl methyl cellulose | Qhov pom tseeb ceev/(g/mL) | Qhov nruab nrab ntawm cov khoom me me / μm | Qhov Viscosity/(mL/g) | Kev nqus dej ntawm 100 g PVC resin / g | Cov khoom tsis ruaj khov /% |
| 1# | Ntshuam | 0.36 | 180 | 196 | 42 | 0.16 |
| 2# | Ntshuam | 0.36 | 175 | 196 | 42 | 0.20 |
| 3# | Ntshuam | 0.36 | 182 | 195 | 43 | 0.20 |
| 4# | Hauv Tebchaws | 0.37 | 165 | 194 | 41 | 0.08 |
| 5# | Hauv Tebchaws | 0.38 | 164 | 194 | 41 | 0.24 |
| 6# | Hauv Tebchaws | 0.36 | 167 | 194 | 43 | 0.22 |
Nws tuaj yeem pom los ntawm Rooj 2: Qhov pom tseeb qhov ceev, tus lej viscosity thiab plasticizer nqus ntawm cov PVC resin tau txais yog ze ze los ntawm kev siv cov cellulose sib txawv rau kev sim me me; cov khoom resin tau txais los ntawm kev siv cov mis hydroxypropyl methylcellulose hauv tsev Qhov nruab nrab qhov loj me yog me dua me ntsis.
Daim Duab 1 qhia cov duab SEM ntawm cov khoom siv PVC resin tau los ntawm kev siv cov hydroxypropyl methylcellulose sib txawv.
(1) — Cov hydroxypropyl methylcellulose uas tau xa tawm los ntawm txawv teb chaws
(2) — Cov tshuaj hydroxypropyl methylcellulose hauv tsev
Daim Duab 1 SEM ntawm cov resins tsim tawm hauv 10-L polymerizer nyob rau hauv qhov muaj ntau yam hydroxypropyl methyl cellulose sib txawv
Nws tuaj yeem pom los ntawm Daim Duab 1 tias cov qauv nto ntawm cov khoom PVC resin uas tsim los ntawm cov cellulose dispersants sib txawv zoo sib xws.
Hauv kev xaus lus, nws tuaj yeem pom tias cov hydroxypropyl methylcellulose hauv tebchaws uas tau sim hauv daim ntawv no muaj peev xwm hloov cov hydroxypropyl methylcellulose uas xa tuaj.
3. 2 Kev sib piv ntawm qhov zoo ntawm PVC resin nrog cov degree polymerization siab hauv kev sim ntau lawm
Vim yog tus nqi siab thiab kev pheej hmoo ntawm kev sim ntau lawm, txoj kev hloov pauv tag nrho ntawm kev sim me me tsis tuaj yeem siv ncaj qha. Yog li ntawd, txoj kev npaj ntawm kev maj mam nce qhov feem pua ntawm cov hydroxypropyl methylcellulose hauv tsev hauv cov mis tau txais yuav. Cov txiaj ntsig ntawm kev sim ntawm txhua pawg tau qhia hauv Rooj 3. qhia.
Rooj 3 Cov txiaj ntsig ntawm kev sim ntawm cov pawg ntau lawm sib txawv
| Pawg | M (hauv tebchaws hydroxypropyl methyl cellulose):M (cov khoom xa tuaj los ntawm txawv teb chaws hydroxypropyl methyl cellulose) | Qhov pom tseeb ceev/(g/mL) | Tus lej viscosity/(mL/g) | Kev nqus dej ntawm 100 g PVC resin / g | Cov khoom tsis ruaj khov /% |
| 0# | 0:100 | 0.45 | 196 | 36 | 0.12 |
| 1# | 1.25:1 | 0.45 | 196 | 36 | 0.11 |
| 2# | 1.25:1 | 0.45 | 196 | 36 | 0.13 |
| 3# | 1.25:1 | 0.45 | 196 | 36 | 0.10 |
| 4# | 2.50:1 | 0.45 | 196 | 36 | 0.12 |
| 5# | 2.50:1 | 0.45 | 196 | 36 | 0.14 |
| 6# | 2.50:1 | 0.45 | 196 | 36 | 0.18 |
| 7# | 100:0 | 0.45 | 196 | 36 | 0.11 |
| 8# | 100:0 | 0.45 | 196 | 36 | 0.17 |
| 9# | 100:0 | 0.45 | 196 | 36 | 0.14 |
Los ntawm Rooj 3, koj tuaj yeem pom tias kev siv cov hydroxypropyl methylcellulose hauv tsev tau maj mam nce ntxiv mus txog thaum txhua pawg ntawm cov hydroxypropyl methylcellulose hauv tsev hloov cov hydroxypropyl methylcellulose uas xa tuaj. Cov cim qhia tseem ceeb xws li kev nqus cov yas thiab qhov ceev pom tseeb tsis hloov pauv ntau, qhia tias cov hydroxypropyl methylcellulose hauv tsev xaiv hauv daim ntawv no tuaj yeem hloov cov hydroxypropyl methylcellulose uas xa tuaj hauv tsev hauv kev tsim khoom.
4 Xaus Lus
Kev ntsuam xyuas ntawm lub tsevhydroxypropyl methyl cellulosentawm 10 L lub cuab yeej sim me me qhia tau hais tias nws muaj peev xwm hloov tau hydroxypropyl methyl cellulose uas xa tuaj; cov txiaj ntsig ntawm kev sim hloov pauv ntau lawm qhia tau hais tias cov hydroxypropyl methyl cellulose hauv tsev siv rau kev tsim cov khoom siv PVC, cov ntsuas zoo tseem ceeb ntawm cov khoom siv PVC tiav thiab cov khoom siv hydroxypropyl methyl cellulose uas xa tuaj tsis muaj qhov sib txawv tseem ceeb. Tam sim no, tus nqi ntawm cov khoom siv cellulose hauv tsev hauv khw qis dua li cov khoom siv cellulose uas xa tuaj. Yog li ntawd, yog tias cov khoom siv cellulose hauv tsev siv rau hauv kev tsim khoom, tus nqi ntawm cov khoom siv pab tsim khoom tuaj yeem txo qis heev.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024