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CN1635009A - A kind of preparation method of polystyrene/polyacrylate self-compatibilizing polymer alloy - Google Patents

A kind of preparation method of polystyrene/polyacrylate self-compatibilizing polymer alloy Download PDF

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CN1635009A
CN1635009A CN 200310120848 CN200310120848A CN1635009A CN 1635009 A CN1635009 A CN 1635009A CN 200310120848 CN200310120848 CN 200310120848 CN 200310120848 A CN200310120848 A CN 200310120848A CN 1635009 A CN1635009 A CN 1635009A
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preparation
polymerization
concentrated emulsion
monomer
vinylbenzene
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CN1254493C (en
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杜中杰
张晨
励杭泉
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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Abstract

The invention provides an in-situ preparation method for polystyrene/polyacrylate self-compatibility macromolecule alloy. The method employs dense emulsion polymerization method comprising two stages of the pre-polymerization of the dense emulsions of the styrene and acrylic acid monomers and the polymerization of charged macromolecule monomers. The first stage comprises: using the styrene/acrylate monomers as the study templates, preparing the dense emulsions, pre-polymerizing; the second stage comprises: mixing partial pre-polymerized dense emulsions of the styrene and acrylic acid monomers charging macromolecule monomers, polymerizing till the reaction is finished, thus the self-compatibility macromolecule alloy can be obtained.

Description

A kind of polystyrene/polyacrylic ester is from the preparation method of increase-volume high polymer alloy
Technical field
The present invention relates to a kind of preparation method, more particularly, the present invention relates to the preparation method of a kind of polystyrene/polyacrylic ester from the increase-volume high polymer alloy from the increase-volume high polymer alloy.
Background technology
Carrying out blend with two or more polymkeric substance is the most convenient, the valid approach that obtains novel material.Polymer blend can have chemistry, the physical properties of each independent component concurrently, also often can produce the not available performance of independent component, has both produced so-called synergistic effect.When chemical nature differed big between polymer blend, this synergistic effect just was easier to occur.Therefore, the blend of research incompatible polymer becomes the main flow that polymer blending is studied over nearly 20 years.But incompatible can the generation is separated between the polymkeric substance, can not be disperseed preferably between the component, so that physics, mechanical property are produced serious influence.So the increase-volume of blend becomes the focus that people pay close attention to day by day.
Adding expanding material is the main method that improves consistency.The CN1198452 patent application discloses olefin(e) compound and methacrylic ester passes through to add the method that segmented copolymer improves consistency; The CN1200384 patent disclosure high impact polyphenylene ether/styrene resin fat/elastic composition improve the method for consistency by the segmented copolymer that adds 2-40%; The US6462131 patent disclosure preparation method of a kind of iso-butylene-ring-alkylated styrenes type segmented copolymer, be that expanding material has improved the consistency between polyisobutene and the polystyrene with iso-butylene-ring-alkylated styrenes type segmented copolymer.The shortcoming that the interpolation expanding material carries out increase-volume is that expanding material costs an arm and a leg, and expanding material is difficult to be uniformly dispersed in polymeric matrix, and compatibilization effect is poor, and the complete processing complexity, and cost is higher.
The response type increase-volume is for improving the common method of consistency between polymkeric substance in recent years.Reactive compatibilizer mainly be some contain can with the multipolymer of the functional group of blend components react with.The US6469099 patent disclosure method of a kind of increase-volume hydrocarbon polymer and polyurethane blends.It is by functional group on the hydrocarbon polymer and the urethane thermoplastic blend of increase-volumeization that carried out prepared in reaction.The US6437049 patent disclosure adopt maleic anhydride inoculated polypropylene method with the method for the consistency that improves polypropylene blend.But above the whole bag of tricks respectively has the limitation of himself.Residence time of material is limited in the forcing machine, and the increase-volume reaction is difficult to fully carry out, and compatibilization effect is poor.Produce heat when reacting simultaneously, control brings inconvenience to temperature.Therefore above-mentioned compatibilizing method is to some system, and nonideal approach.
Summary of the invention
The purpose of this invention is to provide the concentrated emulsion polymerization process for preparing of a kind of polystyrene/polyacrylic ester from the increase-volume high polymer alloy, the styrene monomer or the polymerization of acrylate monomer and the generation of expanding material are carried out synchronously, comprise in the resulting polymer blend after polymerization is finished styrene monomer homopolymer, acrylate monomer homopolymer and on the homopolymer phase interface of styrene monomer polymkeric substance and acrylate monomer generated in-situ expanding material.Synthetic, blend, the increase-volume of the polymkeric substance of styrene monomer and acrylate monomer are once finished, and the product that obtains after the polymerization is the high polymer alloy through increase-volumeization.
The present invention is the preparation method of a kind of polystyrene/polyacrylic ester from the increase-volume high polymer alloy, adopts concentrated emulsion polymeric method, comprises the pre-polymerization of vinylbenzene and acrylate monomer concentrated emulsion and the polymerization of interpolation macromonomer; Concrete steps are as follows:
A: the preparation volume fraction is 75-89%, is preferably 79% vinylbenzene and acrylate monomer concentrated emulsion, carries out pre-polymerization respectively under 40-60 ℃, and extremely monomeric transformation efficiency is 10-25%;
B: vinylbenzene and acrylate monomer concentrated emulsion after the pre-polymerization that steps A is obtained mix with the volume ratio of 1/4-4/1, add macromonomer and initiator, and macromolecular add-on is the 3.6-6.75% of monomer cumulative volume, is preferably 6.75%.The add-on of initiator is 0.5% of a monomer total mass.Under 40-80 ℃, be preferably 60 ℃, carry out polyreaction, reach 96% when above to monomeric total conversion rate, finish reaction, the collection product.
The used styrene monomer of the present invention is meant vinylbenzene or has C on phenyl ring 1To C 15The substituent styrene derivatives of aliphatics; The molecular formula of described acrylate monomer is CH 2C (R 1) COOR 2, R wherein 1=H, CH 3R 2=C 1-C 20Alkyl.
Said macromonomer is the oligopolymer that two ends have polymerizable double bond among the above-mentioned steps B, is preferably polyethyleneglycol diacrylate.The addition manner of macromonomer both can add when preparation monomer concentrated emulsion, added after also can mixing at the concentrated emulsion after the pre-polymerization again.Adding macromonomer again after wherein the concentrated emulsion after partially polymerized mixes is preferred embodiment.
Initiator is azo class or organic peroxy class initiator, preferably Diisopropyl azodicarboxylate or dibenzoyl peroxide.
Preparation vinylbenzene and the used tensio-active agent of acrylate monomer concentrated emulsion are anion surfactant in the steps A, are preferably tensio-active agent sodium lauryl sulphate or sodium laurylsulfonate, and consumption is 1.0-8.0g/100ml H 2O.
Vinylbenzene among the step B after the pre-polymerization and acrylate monomer concentrated emulsion carry out the blended volume ratio its preferably situation be 3/2-2/3, be preferably 1/1.
Polyreaction of the present invention can be carried out in the polymerization reaction kettle of routine and popular response container.The process of preparation polystyrene/polyacrylic ester high polymer alloy comprises two stages, the fs: the concentrated emulsion that at first prepares styrene monomer and acrylate monomer.In the concentrated emulsion system, monomer is as disperse phase, and water is as external phase.Carry out the prepolymerization reaction then respectively; Subordinate phase: the vinylbenzene of part pre-polymerization and the concentrated emulsion of acrylate monomer are mixed, in mixing pre-polymerization concentrated emulsion system, add macromonomer, keep the experiment condition identical, continue to be polymerized to reaction and finish with the fs.Utilize macromonomer to be present in characteristics between the concentrated emulsion drop, further playing crosslinked effect in the polymerization process, thereby between the drop of different monomers, generating micro-crosslinked copolymer.With generated in-situ micro-crosslinked copolymer on the drop interface is expanding material, prepares the polystyrene/polyacrylic ester high polymer alloy from increase-volumeization.Resulting polymerisate was pulverous polymer beads after polymerization was finished.
It is 10-25% that the polyreaction degree of fs should be controlled at monomeric transformation efficiency, and the consumption of concrete polymerization reaction time and monomeric kind, initiator, polymeric reaction temperature etc. are relevant; The polymerization reaction time of subordinate phase should guarantee monomeric transformation efficiency more than 96%, and the concrete reaction times is relevant with the consumption and the polymeric reaction temperature of monomeric character, initiator.
Method of the present invention has salient feature: (1) institute blended is not the polymkeric substance of styrene monomer and acrylate monomer, but does not finish polymeric concentrated emulsion drop as yet; (2) after partially polymerized vinylbenzene concentrated emulsion and acrylate concentrated emulsion mix, styrene monomer or acrylate monomer on the drop interface by and the reaction of macromonomer generate micro-crosslinked copolymer and realize increase-volume between the polymkeric substance of the polymkeric substance of styrene monomer and acrylate monomer; (3) polymeric reaction product is not single polymkeric substance but passes through the blend of increase-volumeization.In the method for the present invention, synthetic, blend, the increase-volume of two kinds of polymkeric substance are once finished, and the product that obtains after polymerization is finished is the polymer blend through increase-volumeization.
According to comprising monomeric separately homopolymer (polystyrene and polyacrylic ester) in the prepared polystyrene of the present invention/polyacrylic ester high polymer alloy from increase-volumeization, the micro-crosslinked copolymer that macromonomer and styrene monomer and acrylate monomer generate, the random copolymers of styrene monomer and acrylate monomer.What wherein it has been generally acknowledged that compatibilization is the micro-crosslinked copolymer of macromonomer and styrene monomer and acrylate monomer generation.
Method of the present invention can make polymerization and dispersion once finish, and has promptly simplified preparation process, makes the high polymer alloy phase structure distribution that obtains even again, thereby guarantees that product has higher physical and mechanical properties.
Description of drawings
Fig. 1 is the transmission electron microscope photo of the embodiment of the invention 1 products obtained therefrom, and its magnification is 100,000 times;
Fig. 2 is the transmission electron microscope photo of the embodiment of the invention 2 products obtained therefroms, and its magnification is 100,000 times;
Fig. 3 is the transmission electron microscope photo of the embodiment of the invention 3 products obtained therefroms, and its magnification is 100,000 times;
Fig. 4 is the transmission electron microscope photo of the embodiment of the invention 4 products obtained therefroms, and its magnification is 100,000 times;
Fig. 5 is the transmission electron microscope photo of the embodiment of the invention 5 products obtained therefroms, and its magnification is 100,000 times;
As can be seen, macromonomer and styrene monomer and acrylate monomer have formed micro-crosslinked copolymer in the resulting high polymer alloy product of the present invention from accompanying drawing, and the consistency between the polymkeric substance is good.
Embodiment
Embodiment 1
(concentration is 0.08g/ml H to the aqueous solution of immigration 4ml sodium lauryl sulphate in the 100mL flask that is placed with magnetic stick 2O), under intense agitation, in flask, drip the styrene monomer that 15ml is dissolved with initiator Diisopropyl azodicarboxylate (0.5g/100g vinylbenzene) with syringe, this process continues about 20min, after dropwising, continue to stir 10min, make the interior disperse phase emulsion particle size of emulsion system evenly, and make emulsion-stabilizing; (concentration is 0.08g/ml H to move into the aqueous solution of 1ml sodium lauryl sulphate in the same way in the 100mL flask that is placed with magnetic stick 2O), under intense agitation, drip the Butyl Acrylate Monomer that 3.75ml is dissolved with initiator Diisopropyl azodicarboxylate (0.5g/100g butyl acrylate) with syringe in flask, the volume fraction of disperse phase is 79% in the preparation butyl acrylate concentrated emulsion, this moment two kinds of concentrated emulsion.
Vinylbenzene and butyl acrylate concentrated emulsion moved into pre-polymerization in 60 ℃ the water bath with thermostatic control respectively.The controlled polymerization reaction times, when the pre-polymerization transformation efficiency is 22.5%, the vinylbenzene concentrated emulsion of part pre-polymerization and butyl acrylate concentrated emulsion are mixed according to 4/1 volume ratio, the macromonomer polyethyleneglycol diacrylate that adds monomer cumulative volume 3.6%, the water-bath of putting into 40 ℃ after mixing continues reaction 28h, and monomer conversion is reached more than 96%.Reaction obtains pulverous polymerisate after finishing.
Embodiment 2
On the basis of embodiment 1, the concentration that changes lauryl sodium sulfate aqueous solution is 5.0g/100mlH 2O.After to be 22.5% vinylbenzene concentrated emulsion and butyl acrylate concentrated emulsion according to 1/1 volume ratio mix with the pre-polymerization transformation efficiency, the macromonomer polyethyleneglycol diacrylate that adds monomer cumulative volume 4.5%, the water-bath of putting into 60 ℃ after mixing continues reaction 20h, makes monomer conversion reach 96%.Reaction obtains pulverous polymerisate after finishing.
Embodiment 3
On the basis of embodiment 1, changing the pre-polymerization temperature is 50 ℃.After to be 15% vinylbenzene concentrated emulsion and butyl acrylate concentrated emulsion according to 1/1 volume ratio mix with the pre-polymerization transformation efficiency, the macromonomer polyethyleneglycol diacrylate that adds monomer cumulative volume 6.75%, the water-bath of putting into 60 ℃ after mixing continues reaction 20h, and monomer conversion is reached more than 96%.Reaction obtains pulverous polymerisate after finishing.
Embodiment 4
On the basis of embodiment 1, the concentration that changes lauryl sodium sulfate aqueous solution is 1.0g/100ml water, and consumption is 5ml.The volume fraction of prepared concentrated emulsion is 75%.After to be 10.0% vinylbenzene concentrated emulsion and butyl methacrylate concentrated emulsion according to 1/1 volume ratio mix with the pre-polymerization transformation efficiency, the macromonomer polyethyleneglycol diacrylate that adds monomer cumulative volume 6.75%, the water-bath of putting into 40 ℃ after mixing continues reaction 28h, and monomer conversion is reached more than 96%.Reaction obtains pulverous polymerisate after finishing.
Embodiment 5
On the basis of embodiment 1, be emulsifying agent with the sodium laurylsulfonate, dibenzoyl peroxide is an initiator, the consumption of adjusting sodium dodecyl sulfate aqueous solution is 2ml.The volume fraction of prepared concentrated emulsion is 88.2%.After to be 10.0% vinylbenzene concentrated emulsion and butyl methacrylate concentrated emulsion according to 1/4 volume ratio mix with the pre-polymerization transformation efficiency, the macromonomer polyethyleneglycol diacrylate that adds monomer cumulative volume 6.75%, the water-bath of putting into 80 ℃ after mixing continues reaction 14h, and monomer conversion is reached more than 96%.Reaction obtains pulverous polymerisate after finishing.

Claims (6)

1. a polystyrene/polyacrylic ester adopts concentrated emulsion polymeric method from the preparation method of increase-volume high polymer alloy, comprises the pre-polymerization of vinylbenzene and acrylate monomer concentrated emulsion and adds the polymerization of macromonomer; Concrete steps are as follows:
A: the preparation volume fraction is vinylbenzene and the acrylate monomer concentrated emulsion of 75-89%, carries out pre-polymerization respectively under 40-60 ℃, and extremely monomeric transformation efficiency is 10-25%;
B: vinylbenzene and acrylate monomer concentrated emulsion after the pre-polymerization that steps A is obtained mix with the volume ratio of 1/4-4/1, add macromonomer and initiator, macromolecular add-on is the 3.6-6.75% of monomer cumulative volume, the initiator add-on is 0.5% of a monomer total mass, under 40-80 ℃, carry out polyreaction, reach 96% when above to monomeric total conversion rate, finish reaction, the collection product;
Said macromonomer is that two ends have polymerizable double bond, middle segment is the oligopolymer of hydrophilic radical among the above-mentioned steps B, and initiator is azo class or organic peroxy class initiator.
2. according to the preparation method of claim 1, it is characterized in that: preparation vinylbenzene and the used tensio-active agent of acrylate monomer concentrated emulsion are anion surfactant in the steps A, and consumption is 1.0-8.0g/100ml H 2O, the volume fraction of prepared monomer concentrated emulsion is preferably 79%.
3. according to the preparation method of claim 1, it is characterized in that: vinylbenzene among the step B after the pre-polymerization and acrylate monomer concentrated emulsion carry out the blended volume ratio and are preferably 1/1.
4. according to the preparation method of claim 1, it is characterized in that: macromolecular add-on is preferably 6.75% of monomer cumulative volume.
5. according to the preparation method of claim 1, it is characterized in that: styrene monomer is meant vinylbenzene or has C on phenyl ring 1To C 15The substituent styrene derivatives of aliphatics; The molecular formula of acrylate monomer is CH 2C (R 1) COOR 2, R wherein 1=H, CH 3R 2=C 1-C 20Alkyl; Used macromole is a polyethyleneglycol diacrylate among the step B; Initiator is Diisopropyl azodicarboxylate or dibenzoyl peroxide.
6. according to the preparation method of claim 1 or 2, it is characterized in that: used tensio-active agent is sodium lauryl sulphate or sodium laurylsulfonate.
CN 200310120848 2003-12-30 2003-12-30 Process for preparing polyphenylacetylene / polyacrylacid ester self-expansion macromolecular alloy Expired - Fee Related CN1254493C (en)

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Application Number Priority Date Filing Date Title
CN 200310120848 CN1254493C (en) 2003-12-30 2003-12-30 Process for preparing polyphenylacetylene / polyacrylacid ester self-expansion macromolecular alloy

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CN1254493C CN1254493C (en) 2006-05-03

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