CN1091436A - High molecular weight styrene-acrylonitrile copolymer letex polymerization production technique - Google Patents
High molecular weight styrene-acrylonitrile copolymer letex polymerization production technique Download PDFInfo
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- CN1091436A CN1091436A CN 93110090 CN93110090A CN1091436A CN 1091436 A CN1091436 A CN 1091436A CN 93110090 CN93110090 CN 93110090 CN 93110090 A CN93110090 A CN 93110090A CN 1091436 A CN1091436 A CN 1091436A
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Abstract
The invention discloses a kind of high molecular weight styrene-acrylonitrile copolymer letex polymerization production technique, by regulating the amount of initiator and molecular weight regulator, make the molecular weight of styrene-acrylonitrile copolymer controlled, and by adding sinking agent, solved product aftertreatment problem, for suitability for industrialized production has been created sufficient condition, its product is used to make low density PVC sheet material, effect excellence.
Description
The present invention relates to a kind of high molecular weight styrene-acrylonitrile copolymer letex polymerization production technique.
Styrene-acrylonitrile copolymer is applicable to the manufacturing of low density PVC sheet material, especially can regulate foaming density and strengthen its physical strength.As everyone knows, along with increasing of polymericular weight, the variation of matter will take place in its physical and chemical performance, and when special purpose, the molecular weight of regulating superpolymer is just particularly important, the emulsion polymerisation process of relevant styrene-acrylonitrile copolymer in the past, lay particular emphasis on the thermal equilibrium and the material balance of research polyreaction more, but all do not have research how to regulate molecular weight product, so that the application performance of product meets the requirements, simultaneously, its product separation is still very difficult.
The purpose of this invention is to provide a kind of high molecular weight styrene-acrylonitrile copolymer letex polymerization production technique, by means of the present invention, can regulate and control the molecular weight of styrene-acrylonitrile copolymer effectively, and can realize product separation easily.
(if no special instructions following, umber is by weight) that the objective of the invention is to adopt following technical scheme to be achieved:
150-180 part distilled water is added one to be had in the reactor of stirring and reflux exchanger, the nearly boiling of heating, with N2 displacement 15-25 minute, fully remove the oxygen in the system, naturally be cooled to about 50 ℃ then, add 1.5-2.5 part Sodium dodecylbenzene sulfonate (or etc. mole number rosined soap), the vinyl cyanide that adds 60-80 part vinylbenzene and 40-20 part again, add again the polymethyl siloxane of (0.01-0.03) part and 0.4-0.6 part K2CO3(or etc. mole number Na2CO3), and adding initiator potassium persulfate (K2S2O8) 0.05-0.07 part, alkyl sulfhydryl quasi-molecule amount conditioning agent (for example 2,4,6-trimethylammonium mercaptan in ninth of the ten Heavenly Stems 0.05-0.01 part), under agitation heat up, along with reactor temperature progressively rises, polyreaction is accelerated gradually, reflux and accelerate gradually, at this moment stop heating, and suitably condensation makes temperature of reaction remain on 60-70 ℃, after the exothermic phenomenon of fierceness is gone over, keep 70-80 ℃ of temperature, the entire reaction time is 2hrs, temperature is raised to 80 ℃ then, keep half an hour, finish insulation, naturally cooling.
Put to another and have in the reactor of stirring being cooled to polymer emulsion about 30 ℃, the domestic demand of this reactor has added 100-300 part water in advance, include 2-8 part NaCl(or with mole number Na2SO4), 0.1-0.3 part sodium polystyrene sulfonate (sinking agent) under agitation is heated to 90 ℃, kept 30 minutes, centrifuge dehydration then washes twice again, dehydrates, obtaining product is white powder (200 order), does emulsion (K:3.6 * 10 with butanone
-2, α: 0.62), recording molecular weight is 300-900 ten thousand.
The present invention is by regulating the amount of initiator and molecular weight regulator, can make molecular weight of copolymer reach desired level, by adding sinking agent, ideally solved the key problem in technology of product aftertreatment, thereby solved the suitability for industrialized production problem, products obtained therefrom is used to make low density PVC sheet material, effect excellence.
Claims (4)
1, a kind of high molecular weight styrene-acrylonitrile copolymer letex polymerization production technique, it is characterized in that: 150-180 weight part distilled water is added one have in the reactor of stirring and reflux exchanger, the nearly boiling of heating, with N2 displacement 15-25 minute, fully remove the oxygen in the system, naturally be cooled to about 50 ℃ then, add 1.5-2.5 weight part Sodium dodecylbenzene sulfonate, the vinyl cyanide that adds 60-80 parts by weight of styrene and 40-20 weight part again, the polymethyl siloxane and the 0.4-0.6 weight part K2CO3 that add the 0.01-0.03 weight part again, and adding initiator potassium persulfate (K2S2O8) 0.05-0.07 part, alkyl sulfhydryl quasi-molecule amount conditioning agent 2,4,6-trimethylammonium mercaptan in ninth of the ten Heavenly Stems 0.05-0.01 weight part, under agitation heat up, along with reactor temperature progressively rises, polyreaction is accelerated gradually, reflux and accelerate gradually, at this moment stop heating, and suitably condensation makes temperature of reaction remain on 60-70 ℃, after the exothermic phenomenon of fierceness is gone over, keep 70-80 ℃ of temperature, the entire reaction time is 2hrs, temperature is raised to 80 ℃ then, keep half an hour, finish insulation, naturally cooling is put to another and is had in the reactor of stirring being cooled to polymer emulsion about 30 ℃, and this reactor domestic demand has added the 100-300 weight parts water in advance, include 2-8 weight part NaCl, 0.1-0.3 weight part sinking agent sodium polystyrene sulfonate under agitation is heated to 90 ℃, keeps 30 minutes, through centrifuge dehydration, washing, dehydrate and get final product.
2, production technique according to claim 1 is characterized in that: described Sodium dodecylbenzene sulfonate is substituted by the rosined soap with mole number.
3, production technique according to claim 1 is characterized in that: described K2CO3 is substituted by the Na2CO3 with mole number.
4, production technique according to claim 1 is characterized in that, described NaCl is substituted by the Na2SO4 with mole number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110090 CN1091436A (en) | 1993-02-15 | 1993-02-15 | High molecular weight styrene-acrylonitrile copolymer letex polymerization production technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110090 CN1091436A (en) | 1993-02-15 | 1993-02-15 | High molecular weight styrene-acrylonitrile copolymer letex polymerization production technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1091436A true CN1091436A (en) | 1994-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93110090 Pending CN1091436A (en) | 1993-02-15 | 1993-02-15 | High molecular weight styrene-acrylonitrile copolymer letex polymerization production technique |
Country Status (1)
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| CN (1) | CN1091436A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443516C (en) * | 2003-09-30 | 2008-12-17 | 株式会社日本触媒 | Polymer and its producing method |
| CN101418060B (en) * | 2007-10-23 | 2010-09-29 | 山东瑞丰高分子材料股份有限公司 | AS resin with excellent impact resistance property |
| CN102443089A (en) * | 2010-09-30 | 2012-05-09 | 日本A&L株式会社 | Copolymer latex, composition for battery electrode and composition for paper coating |
-
1993
- 1993-02-15 CN CN 93110090 patent/CN1091436A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443516C (en) * | 2003-09-30 | 2008-12-17 | 株式会社日本触媒 | Polymer and its producing method |
| CN101418060B (en) * | 2007-10-23 | 2010-09-29 | 山东瑞丰高分子材料股份有限公司 | AS resin with excellent impact resistance property |
| CN102443089A (en) * | 2010-09-30 | 2012-05-09 | 日本A&L株式会社 | Copolymer latex, composition for battery electrode and composition for paper coating |
| CN102443089B (en) * | 2010-09-30 | 2015-11-25 | 日本A&L株式会社 | Copolymer emulsion, battery electrode composition and paper coating composition |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |