CS205667B1 - Method of preparation of the polyvinylchloride dispersions - Google Patents
Method of preparation of the polyvinylchloride dispersions Download PDFInfo
- Publication number
- CS205667B1 CS205667B1 CS27579A CS27579A CS205667B1 CS 205667 B1 CS205667 B1 CS 205667B1 CS 27579 A CS27579 A CS 27579A CS 27579 A CS27579 A CS 27579A CS 205667 B1 CS205667 B1 CS 205667B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- reactor
- pressure
- polymerization
- preparation
- dispersions
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 11
- 239000006185 dispersion Substances 0.000 title claims description 5
- 238000002360 preparation method Methods 0.000 title claims description 5
- 239000004800 polyvinyl chloride Substances 0.000 title description 5
- 229920000915 polyvinyl chloride Polymers 0.000 title description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000010526 radical polymerization reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims 1
- 238000002835 absorbance Methods 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000000178 monomer Substances 0.000 claims 1
- 239000004014 plasticizer Substances 0.000 claims 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000010951 particle size reduction Methods 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
Landscapes
- Polymerisation Methods In General (AREA)
Description
Vynález se týká způsobu přípravy disperzí polyvinylohloridu (dále jen PVC) radikálovou polymeraoí nebo kopolymeraoí vinylehloridu (dále φβη VÓM) ve vodném prostředí.
Suspenzní polymeraoe VCM probíhá ve vodném prostředí za míchání a za přídavku ochranných koloidů,jako jsou např. polyvinylalkohol,polyvinylacetát (hydrolyzovaný do rdaného Stupně),substituované etery celulóz,popřípadě jemně dispergovaných anorganických stabilizáto rů suspenze,qapř. CaC0^,BaS0^ aj.,a iniciátorů,jako jsou benzoylperoxid,dilauroylperoXid, dlizopropylperóxidlkarbonát nebo azobisizobutyronitril.K násadě se přidávají ještě jiné složky,např, antioxidanty,látky upravující pH prostředí,látky omezující tvorbu nálepů na stěnách reaktorů aj.Zpracovatelný průmysl požaduje,aby částice PVC byly 00 nejvíce homogenní, pravidelné^ s velmi úzkou a symetrickou distribucí částiof pro dopravu je žádoucí vyšší sypná hmotnost (tím nižší náklady ha dopravu a aa obaly).
Dosažení výše uvedenýoh parametrů zajišťuje postup podle vynálezu,tj. způsob přípravy PVC disperzí radikálovou polymeraoí VCM ve vodném prostředí,spočívající v tom,že polymeraee nebo její počáteční fáze,a to až do 50 % konverze,probíhá pod tlakem inertního plynu, jako je dusík,argon,vodík,metan,kysličník uhličitý a uhelnatý,tedy obecně látky netúčastnující se veakee a majíoí bod varu nižší jak 298,2 K,který zvyšuje celkový tlak v
205 667
205 007 reaktoru nejvíoe o 0,19 MPa nad parciální tlak monomeru při daná reakční teplotě.Reaktor je předem lnertizován některým a těohto plynů a ten pak buS zůstává v reaktoru po oelou dobu polymeraoe.nebo je reaktor před nadávkováním monomeru «vakuován až na tlak nasycených par vody při její teplotě.
Postupem podle vynálezu dosáhneme anížení průměrná velikosti částic,zúžení distrlbuoe velikosti částlo a svýěení její symetrie,svýěení sypné hmotnosti a snížení porosity produktu.Získaná Sáetioe jeou pravidelněji!,lépe prostoupená směkěovadlem a podíl nepravidelnýoh částic js nlžěl.Dalěí výhodou navrhovaného postupu je to,že celkový tlak v reaktoru ae avyěuje přídavkem insřtu o velmi nízkou hodnotu.
Postup přípravy PVC disperzí podle vynálezu je blíže osvětlen na následujíoíoh příkladeoh.
e
Příklad 1
Do míchaného autoklávu předám inertlsovaného dusíkem bylo nadávkováno 4,1 litru vody,
3,6 g stabilizátorů suspense a 2,6 perozldiokýoh iniciátorů.Autokláv byl evakaován na 2,667 kPa a po nadávkování 2,4 kg VCM byl vyhřát na 332,7 X a polymerováno 6 hodn při n · 300 ot./mifc.Polymerační tlak byl 0,93 MPa.
Příklad 2
Postup Jako v příkladu l,ale po vyhřátí autoklávu na polymeraění teplotu 332,7 X byl tlak zvýěen o 0,02 MPa tlakovým dusíkem a udržován 1 hodinu. z .
Příklad 3
Postup jako v příkladu l,ale po vyhřátí autoklávu na 332,7 X byl tlakovým dusíkem zvýěen tlak o 0,1 MPa.
Příklad 4
Postup jako v příkladu 1,ale tlak byl zvýěen ihned oi nadávkování složek o 0,18 ΜΡβ,Ρο 2 hodinách polymerace při 332,7 X byl tlak snížen na hodnotu jako v příkladu 1 odpuětěním části plynné fáze.
Příklad 5
Postup jeko v příkladu l,s tím rozdílem,že v evakuovaném reaktoru byl tlak avýěen vodíkem o 0,03 MPa.Polymeraěbí tlak byl. 0,94 MPa,
Příklad 6
Postup jako v příkladu l,ale dusík použitý aa inertizaoi byl ponechán v reaktoru po oelou lotu polymerace (odpadla tedy evakuaceautoklávu).Výsledný tlak byl 1,025 MPa.
205 06
Kvalitativní parametry získaných polymerů jsou uvedeny v tabuloe.
příklad t 1 2 3 4 5 6 sypná hmotnost (g/1)The present invention relates to a process for the preparation of polyvinyl chloride (PVC) dispersions by free-radical polymerization or copolymerization of vinyl chloride (hereinafter VOM) in an aqueous medium.
The suspension polymerization VCM is carried out in an aqueous medium with stirring and with the addition of protective colloids, such as polyvinyl alcohol, polyvinyl acetate (hydrolyzed to an early stage), substituted cellulose ethers, optionally finely dispersed inorganic suspension stabilizers, e.g. CaCO2, BaSO4, etc., and initiators such as benzoyl peroxide, dilauroyl peroxide, dlisopropylperoxide carbonate or azobisisobutyronitrile. Other ingredients are added to the batch, e.g. In order for the PVC particles to be most homogeneous, regular, with a very narrow and symmetrical distribution of the portions for transport, a higher bulk density (the lower the cost of transport and aa packaging) is desirable.
The achievement of the above parameters is ensured by the process according to the invention, i. A process for the preparation of PVC dispersion by free radical polymerization VCM in which the polymer or its initial phase, up to 50% conversion, is carried out under the pressure of an inert gas such as nitrogen, argon, hydrogen, methane, carbon dioxide and carbon monoxide. in general, non-vapor substances having a boiling point lower than 298.2 K, which increases the total pressure in the
205 667
The reactor is pre-inerted with some and these gases, and it is either left in the reactor for a long period of polymerization. water vapor at its temperature.
The process according to the invention results in an average particle size reduction, a narrowing of the particle size distribution and an increase in its symmetry, an increase in bulk density and a decrease in the porosity of the product.It is obtained more readily permeated by the surfactant and irregular particle content. the total pressure in the reactor is increased by a very low value by adding insect.
The preparation of the PVC dispersions according to the invention is explained in more detail in the following examples.
E
Example 1
4.1 liters of water were metered into the stirred autoclave, inerted with nitrogen.
3.6 g of suspension stabilizers and 2.6 perozldiokýoh initiators. The autoclave was evacuated to 2.667 kPa and after dosing 2.4 kg VCM was heated to 332.7 X and polymerized 6 values at n · 300 rpm. The polymerization pressure was 0,93 MPa.
Example 2
Procedure As in Example 1, but after heating the polymerization autoclave at a temperature of 332.7 ° C, the pressure was increased by 0.02 MPa with pressurized nitrogen and held for 1 hour. z .
Example 3
The procedure as in Example 1, but after heating the autoclave to 332.7 X, the pressure was increased by 0.1 MPa with pressure nitrogen.
Example 4
The procedure as in Example 1, but the pressure was increased immediately by adding the components by 0.18 8β, 2ο 2 hours of polymerization at 332.7 ° C, the pressure was reduced to the value of Example 1 by forcing part of the gas phase.
Example 5
The procedure is as in Example 1, except that the pressure in the evacuated reactor was 0.03 MPa with hydrogen. 0,94 MPa,
Example 6
The procedure as in Example 1, but the nitrogen used and inerted, was left in the reactor after a lot of polymerization (hence the evacuation of the autoclave). The resulting pressure was 1.025 MPa.
205 06
The qualitative parameters of the polymers obtained are given in the tabular table.
Example t 1 2 3 4 5 6 Bulk density (g / l)Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS27579A CS205667B1 (en) | 1979-01-12 | 1979-01-12 | Method of preparation of the polyvinylchloride dispersions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS27579A CS205667B1 (en) | 1979-01-12 | 1979-01-12 | Method of preparation of the polyvinylchloride dispersions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS205667B1 true CS205667B1 (en) | 1981-05-29 |
Family
ID=5334588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS27579A CS205667B1 (en) | 1979-01-12 | 1979-01-12 | Method of preparation of the polyvinylchloride dispersions |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS205667B1 (en) |
-
1979
- 1979-01-12 CS CS27579A patent/CS205667B1/en unknown
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