CN1341667A - Method for initiating polymerization of microemulsion by means of ultrasonic wave - Google Patents

Method for initiating polymerization of microemulsion by means of ultrasonic wave Download PDF

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CN1341667A
CN1341667A CN 00113154 CN00113154A CN1341667A CN 1341667 A CN1341667 A CN 1341667A CN 00113154 CN00113154 CN 00113154 CN 00113154 A CN00113154 A CN 00113154A CN 1341667 A CN1341667 A CN 1341667A
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ultrasonic wave
ultrasonic
sodium
microemulsion polymerization
microemulsion
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CN1118478C (en
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王琪
廖勇勤
夏和生
王良文
华正坤
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Sichuan University
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Sichuan University
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Abstract

超声波引发微乳液聚合的方法,其特点是利用超声波的分散、乳化、引发等作用,在较低温度和无需引发剂的情况下实现微乳液聚合,制备粒径分布均匀,尺寸在30nm-100nm的乳胶粒。Ultrasonic-induced microemulsion polymerization, which is characterized by the use of ultrasonic dispersion, emulsification, initiation, etc., to achieve microemulsion polymerization at a lower temperature and without the need for an initiator, and to prepare microemulsions with uniform particle size distribution and a size of 30nm-100nm. Latex particles.

Description

The method of initiating polymerization of microemulsion by means of ultrasonic wave
The present invention relates to a kind of method of initiating polymerization of microemulsion by means of ultrasonic wave.
Polymer nano material has extremely important application at aspects such as stealth material, information material, high-performance coating and bio-medical materials.Micro-emulsion polymerization is one of important method of preparation polymer nano-particle, existing more research (1.Larpent C., Bernard E, Richard J., Vaslin S., Macromolecules, 1997,30:354.2 Gan L.M., Chew C.H., Lee K.C., Ng S.C..Polymer, 1993,34:3064.3.Gan L.M., Lee K.C., Chew C.H., NgS.C., Gan L.H..Macromolecules, 1994,27:6335).But there are some limitation in conventional micro-emulsion polymerization, and is big as the emulsifying agent consumption, and emulsifying agent/monomer ratio is greater than 1; Need assistant for emulsifying agent, polymkeric substance purification difficult etc.
Cavitation effect takes place when ultrasonic wave is propagated in liquid medium, promptly in extremely short time and minimum space, produce localized hyperthermia (~5000K), high pressure (~10 8Pa), rate of temperature change reaches 10 9K/s, and be attended by the jet that intensive shockwave and speed per hour reach 400 km.This provides a kind of very special physicochemical environment for chemical reaction.Localized hyperthermia's high pressure that the ultrasonic cavitation effect produces and a series of physics, chemical action are enough to make enter in the cavitation bubble or be positioned near its small molecules cracking produce free radical, thereby cause various chemical reactions.This provides condition for initiating polymerization of microemulsion by means of ultrasonic wave.
The objective of the invention is provides a kind of initiating polymerization of microemulsion by means of ultrasonic wave method at the deficiencies in the prior art, be characterized in utilizing effects such as hyperacoustic dispersion, emulsification, initiation, at lesser temps with need not to realize micro-emulsion polymerization under the situation of initiator, the preparation size distribution is even, and size is at nano level emulsion particle.
The objective of the invention is to realize that by following technical measures wherein said raw material umber is parts by weight except that specified otherwise.
The method of initiating polymerization of microemulsion by means of ultrasonic wave:
(1) 1~40 part of monomer, emulsifying agent 1-10 part, 60~99 parts in dispersion medium and auxiliary agent thereof add in the ultrasound wave irradiation reactor, again with in the ultrasonic wave horn,amplitude transformer insertion reaction device for 0.2~5 part.
(2) fed nitrogen about 2~10 minutes, logical nitrogen speed is 0.1~50 ml/min, and logical circulator bath temperature is 0-50 ℃.
(3) start ultrasonoscope, carry out polyreaction, the ultrasonic power regulation range is at 50-1500w, frequency 2 * 10 4~10 9Hz, 10 minutes~5 hours reaction times.
Monomer is that methyl methacrylate, ethyl propenoate, butyl acrylate, vinylbenzene, vinyl cyanide, acrylamide and/or the vinyl monomer that has surface-active sulfonic acid group, hydroxy-acid group, quaternary ammonium group are at least a.
Emulsifying agent is that sorbitan monooleate, polyoxyethylene (20) Witconol AL 69-66, succsinic acid two-2-ethylhexyl sodium sulfonate, cetyl trimethylammonium bromide, sodium lauryl sulphate, Sodium palmityl sulfate and Sodium dodecylbenzene sulfonate are at least a.
Auxiliary agent is that Polyvinylpyrolidone (PVP), sodium polyacrylate, polyoxyethylene glycol, n-hexyl alcohol, Pentyl alcohol and propyl carbinol are at least a.
Dispersion medium be water and/or with other solvents of water arbitrary proportion blended as alcohol, ketone etc., for the consideration of economy and environment aspect, the most preferred with water.
The emulsion particle median size of the present invention's preparation is 30-100nm, narrow diameter distribution; Polymericular weight is 10 6The order of magnitude.
The present invention has following advantage:
(1) polymerization does not need initiator;
(2) temperature of reaction is lower;
(3) required emulsifier concentration is lower than conventional micro-emulsion polymerization;
(4) particle diameter is little, is nano level and is evenly distributed;
(5) molecular weight of product is higher;
Embodiment:
Below by embodiment the present invention is specifically described.Be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
1. with methyl methacrylate 10g, sodium lauryl sulphate 5g, Pentyl alcohol 1g, water 84g joins in the reactor, feeds about 5 minutes of nitrogen with the oxygen in the eliminating system, and 30 ℃ of control bath temperatures.Open VC-1500 ultrasonic instrument (Sonic﹠amp then; Materials Inc.) beginning polyreaction.Ultrasonic power is 600w in the reaction process, and frequency is 20kHz, and it is constant that nitrogen speed 10 ml/min keep.React and finished in 30 minutes.The polymethylmethacrylate latex particle size of preparation is 36.5nm, and molecular weight is 5.0 * 10 6
2. with butyl acrylate 8g, cetyl trimethylammonium bromide 3g, n-hexyl alcohol 0.5g, water 88.5g joins in the reactor, feeds about 5 minutes of nitrogen with the oxygen in the eliminating system, and 40 ℃ of control bath temperatures.Open VC-1500 ultrasonic instrument (Sonic﹠amp then; Materials Inc.) beginning polyreaction.Ultrasonic power is 200w in the reaction process, and frequency is 40kHz, and it is constant that nitrogen speed 20 ml/min keep.React and finished in 2 hours.The butyl polyacrylate latex particle size of preparation is about 50nm, and molecular weight is 5.5 * 10 6
3. with vinylbenzene 20g, succsinic acid two-2-ethylhexyl sodium sulfonate 4g, Polyvinylpyrolidone (PVP) 0.5g, n-hexyl alcohol 1g, water 74.5g joins in the reactor, feeds about 5 minutes of nitrogen with the oxygen in the eliminating system, and 20 ℃ of control bath temperatures.Open VC-1500 ultrasonic instrument (Sonic﹠amp then; Materials Inc.) beginning polyreaction.Ultrasonic power is 100w in the reaction process, and frequency is 35kHz, and it is constant that nitrogen speed 15 ml/min keep.React and finished in 1 hour.The polystyrene latex grain particle diameter of preparation is about 30nm, and molecular weight is 4.5 * 10 6

Claims (5)

1.超声波引发微乳液聚合的方法,其特征在于:1. the method that ultrasonic wave initiates microemulsion polymerization, is characterized in that: (1)单体,1~40份,乳化剂,1-10份,分散介质60~99份及其助剂0.2~5份加入超声辐照反应器中,再将超声波变辐杆插入反应器内,(1) Monomer, 1-40 parts, emulsifier, 1-10 parts, 60-99 parts of dispersion medium and 0.2-5 parts of additives are added to the ultrasonic irradiation reactor, and then the ultrasonic radial rod is inserted into the reactor Inside, (2)  通入氮气约2~10分钟,通氮气速率为0.1~50毫升/分钟,通循环水浴温度为0-50℃,(2) Introduce nitrogen gas for about 2 to 10 minutes, the rate of nitrogen gas flow is 0.1 to 50 ml/min, and the temperature of the circulating water bath is 0-50°C. (3)  启动超声波仪,进行聚合反应,超声功率调节范围在50-1500w,频率为2×104~109Hz,反应时间10分钟~5小时。(3) Start the ultrasonic instrument to carry out the polymerization reaction, the ultrasonic power adjustment range is 50-1500w, the frequency is 2×10 4 ~10 9 Hz, and the reaction time is 10 minutes to 5 hours. 2.按照权利要求1所述超声波引发微乳液聚合的方法,其特征在于单体为甲基丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、苯乙烯、丙烯腈、丙烯酰胺和/或带有表面活性的磺酸基团、羧酸基团、季铵基团的乙烯类单体至少一种。2. according to the method for the described ultrasonic wave of claim 1 to initiate microemulsion polymerization, it is characterized in that monomer is methyl methacrylate, ethyl acrylate, butyl acrylate, styrene, acrylonitrile, acrylamide and/or has surface At least one active sulfonic acid group, carboxylic acid group, and quaternary ammonium group vinyl monomer. 3.按照权利要求1所述超声波引发微乳液聚合的方法,其特征在于乳化剂为失水山梨醇单油酸酯、聚氧化乙烯(20)失水山梨醇三油酸酯、琥珀酸二-2-乙基己酯磺酸钠、十六烷基三甲基溴化铵、十二烷基硫酸钠、十六烷基硫酸钠和十二烷基苯磺酸钠至少一种。3. according to the method that the described ultrasonic wave of claim 1 initiates microemulsion polymerization, it is characterized in that emulsifying agent is sorbitan monooleate, polyoxyethylene (20) sorbitan trioleate, succinic acid di- At least one of sodium 2-ethylhexyl sulfonate, cetyltrimethylammonium bromide, sodium lauryl sulfate, sodium cetyl sulfate and sodium dodecylbenzenesulfonate. 4.按照权利要求1所述超声波引发微乳液聚合的方法,其特征在于助剂为聚乙烯基吡咯烷酮、聚丙烯酸钠、聚乙二醇、正己醇、正戊醇和正丁醇至少一种。4. according to the method for said ultrasonic wave initiating microemulsion polymerization of claim 1, it is characterized in that auxiliary agent is at least one of polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, n-hexanol, n-pentanol and n-butanol. 5.按照权利要求1所述超声波引发微乳液聚合的方法,其特征在于分散介质为水和/或与水任意比例混合的溶剂醇和酮。5. according to the method for said ultrasonic wave initiating microemulsion polymerization of claim 1, it is characterized in that dispersion medium is water and/or solvent alcohol and ketone mixed with water in any proportion.
CN 00113154 2000-09-04 2000-09-04 Method for initiating polymerization of microemulsion by means of ultrasonic wave Expired - Lifetime CN1118478C (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104558322A (en) * 2013-10-15 2015-04-29 中国石油化工股份有限公司 Method for polymerizing acrylamide by ultrasonic technology
CN106478883A (en) * 2016-11-30 2017-03-08 黄河三角洲京博化工研究院有限公司 A kind of styrene-butadiene latex and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104558322A (en) * 2013-10-15 2015-04-29 中国石油化工股份有限公司 Method for polymerizing acrylamide by ultrasonic technology
CN106478883A (en) * 2016-11-30 2017-03-08 黄河三角洲京博化工研究院有限公司 A kind of styrene-butadiene latex and preparation method thereof

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