CN105037656A - Polypropylene/polystyrene alloy and preparation method thereof - Google Patents
Polypropylene/polystyrene alloy and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of polypropylene/polystyrene alloy. The preparation method comprises the following steps: 1, weighing, by weight, 50-90 parts of polypropylene, 10-50 parts of polystyrene, 1-5 parts of acrylate monomers with polyfunctional groups, 0.1-0.5 part of antioxygen and 0.01-0.5 part of initiating agent; 2, adding the acrylate monomers with polyfunctional groups, the antioxygen and the initiating agent into organic solvent, conducting premixing, obtaining a premixed solution, and then mixing the premixed solution, the polypropylene and the polystyrene for obtaining a mixture; 3, adding the mixture into a screw extruder, introducing supercritical carbon dioxide at 1/5-1/3 position of a screw of the screw extruder, conducting melt extrusion, and obtaining the polypropylene/polystyrene alloy. According to the method, the supercritical carbon dioxide is introduced into the screw, the reaction temperature is lowered substantially, the reaction capacity between the polypropylene and the polystyrene is improved greatly, more polypropylene grafted polystyrene is formed in situ, and therefore the consistency between the polypropylene and polystyrene is improved remarkably. The invention further provides the polypropylene/polystyrene alloy.
Description
Technical field
The present invention relates to technical field of polymer materials, particularly relate to a kind of polypropylene/polystyrene alloy and preparation method thereof.
Background technology
Polypropylene and polystyrene are the macromolecular material of widespread use, and it all has respective feature performance benefit and Application Areas.Wherein, the features such as polypropylene has that price is low, density is little, nontoxic, resistance to chemical attack and good mechanical performance, but its to there is molding shrinkage large, the feature of easy shrinking deformation, thus limit its range of application.And the shrinking percentage of polystyrene is little, rigidity is large, but itself is more crisp, and shock strength is low, easily occurs stress cracking.Therefore, it is desirable to, by by above-mentioned two kinds of polymer blendings, to obtain the high-performance polypropylene/polystyrene alloy having both Common advantages concurrently.
But polypropylene and polystyrene are completely inconsistent two kinds of polymkeric substance, prepare polypropylene/polystyrene alloy, what first will solve is both compatibility problem.At present mainly by adding the consistency that the 3rd component (segmented copolymer, modified filler) improves both in two kinds of polymkeric substance.Such as publication number is the preparation method that application discloses a kind of polypropylene-polystyrene alloy material of CN103497421A, and it adopts additional composite compatilizer to improve the consistency of polypropylene and polystyrene.But the compatilizer added by this method is difficult in the polymer dispersed, easily produces reunion, thus have influence on the over-all properties of goods.Publication number is the preparation method that the patent application of CN102492096A then discloses another polypropylene-polystyrene resin, it adopts pre-irradiation method to produce superoxide in polypropylene molecular chain, recycles suspension method by styrene polymerization on polypropylene macromolecular chain.But there is complex technical process in this method, the problems such as side reaction is more.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of preparation method improving the polypropylene/polystyrene alloy of polypropylene/polystyrene blend compatibility and processability excellence at reaction process situ, to solve the deficiencies in the prior art.
The invention provides a kind of preparation method of polypropylene/polystyrene alloy, it comprises the steps:
A takes polypropylene 50 ~ 90 weight part, polystyrene 10 ~ 50 weight part, with multi-functional acrylate monomer 1 ~ 5 weight part, and oxidation inhibitor 0.1 ~ 0.5 weight part, initiator 0.01 ~ 0.5 weight part;
B adds premix in organic solvent by described obtain premixed solution with multi-functional acrylate monomer, oxidation inhibitor, initiator, then premixed solution and polypropylene and polystyrene are mixed to get mixture;
Described mixture adds in a screw extrusion press by c, and at the carbonic acid gas that 1/5 ~ 1/3 place of the screw rod of screw extrusion press passes into above-critical state, melt extrudes and obtain polypropylene/polystyrene alloy.
Organic solvent described in step b is at least one in ethanol, acetone, chloroform, and the weight ratio of described initiator and described organic solvent is 1:30 ~ 1:180.
In step c, the temperature in the first half district of screw rod is 185 DEG C ~ 210 DEG C, and the temperature in the later half district of screw rod is 150 DEG C ~ 185 DEG C.
The quality of the carbonic acid gas of above-critical state described in step c accounts for 4% ~ 15% of the total mass of described mixture, and the injection pressure of the carbonic acid gas of described above-critical state is 8MPa ~ 18MPa.
Pass into the carbonic acid gas of above-critical state at 1/4 place of the screw rod of screw extrusion press in step c.
Described polypropylene be homo-polypropylene, Co-polypropylene or both with arbitrary proportion mixing blend, described polyacrylic melting index is 0.1g/10min ~ 50g/10min (test condition is 2.16Kg/190 DEG C).
The melting index of described polystyrene is 0.5g/10min ~ 20g/10min (test condition is 5.0Kg/200 DEG C).
Described initiator is at least one in dicumyl peroxide, dibenzoyl peroxide, di-t-butyl peroxide, peroxy dicarbonate two (4-tertiary butyl caproic acid), the two 2-ethylhexoate of peroxide acetic acid butyl ester, hydrogen phosphide cumene, peroxy dicarbonate.
Described oxidation inhibitor is 1, 6-hexanediyl ester, four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, N, N'-pair-(3-(3, 5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine, two [the 3-(3 of sulfo-diethylene, 5-di-tert-butyl-hydroxy phenyl) propionic ester], β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester, three [2, 4-di-tert-butyl-phenyl] at least one in phosphorous acid ester, described is pentaerythritol triacrylate with multi-functional acrylate monomer, Viscoat 295, 1, at least one in 4-butylene glycol diacrylate.
The present invention also provides a kind of above-mentioned preparation method the polypropylene/polystyrene alloy obtained, and the dispersed phase size of described polypropylene/polystyrene alloy is 0.1 μm ~ 3 μm, and interfacial tension is 0.5mN/m ~ 4mN/m.
Compared to prior art, present method does not need additionally to add compatilizer, but generates polypropylene grafted polystyrene by reactive extrursion method, thus original position improves the consistency of polypropylene and polystyrene, the polypropylene/polystyrene alloy of excellent.In addition, by passing into the carbonic acid gas of above-critical state at 1/5 ~ 1/3 place of described screw rod, temperature of reaction is significantly reduced, effectively inhibit the degraded of polymkeric substance in reaction process, substantially increase the grafting ability of polypropylene and polystyrene, thus significantly improve the consistency of polypropylene and polystyrene.Concrete, in reaction process, the carbonic acid gas of above-critical state increases the free volume of melt polypropylene and polystyrene melt, effectively reduces the cage effect of polypropylene macromolecular radical and polystyrene macromolecular free radical, add both reaction probabilities, thus improve percentage of grafting; Meanwhile, the carbonic acid gas of above-critical state possesses the density of liquid and the spread coefficient of gas, can be used as the carrier of reaction member, also can increase the probability of polypropylene macromolecular radical and polystyrene macromolecular free radical reaction; In addition, the carbonic acid gas of above-critical state reduces the viscosity of polymer melt, thus reduces temperature of reaction, restrained effectively the degraded of polymkeric substance, thus obtains that degradation rate is low, consistency good and the polypropylene/polystyrene alloy of excellent property.The method technique is simple, energy consumption is low, and gained polypropylene/polystyrene alloy all shows good characteristic in processing characteristics and mechanical property etc.The present invention also provides the polypropylene/polystyrene alloy prepared by this preparation method a kind of.
Embodiment
Be clearly and completely described to the technical scheme in embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of preparation method of polypropylene/polystyrene alloy, it comprises the steps:
A takes polypropylene 50 ~ 90 weight part, polystyrene 10 ~ 50 weight part, with multi-functional acrylate monomer 1 ~ 5 weight part, and oxidation inhibitor 0.1 ~ 0.5 weight part, initiator 0.01 ~ 0.5 weight part;
B adds premix in organic solvent by described obtain premixed solution with multi-functional acrylate monomer, oxidation inhibitor, initiator, then premixed solution and polypropylene and polystyrene are mixed to get mixture;
Described mixture adds in a screw extrusion press by c, and at the carbonic acid gas that 1/5 ~ 1/3 place of the screw rod of screw extrusion press passes into above-critical state, melt extrudes and obtain polypropylene/polystyrene alloy.
In step a, described polypropylene can be homo-polypropylene, Co-polypropylene or both are with the blend of arbitrary proportion mixing, and described polyacrylic melting index is 0.1g/10min ~ 50g/10min (test condition is 2.16Kg/190 DEG C).The melting index of described polystyrene is 0.5g/10min ~ 20g/10min (test condition is 5.0Kg/200 DEG C).Described initiator can be at least one in dicumyl peroxide, dibenzoyl peroxide, di-t-butyl peroxide, peroxy dicarbonate two (4-tertiary butyl caproic acid), the two 2-ethylhexoate of peroxide acetic acid butyl ester, hydrogen phosphide cumene, peroxy dicarbonate.Described oxidation inhibitor can be 1; 6-hexanediyl ester, four [β-(3; 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, N; N'-pair-(3-(3; 5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine, the two [3-(3 of sulfo-diethylene; 5-di-tert-butyl-hydroxy phenyl) propionic ester], β-(3; 5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester, at least one in three [2,4-di-tert-butyl-phenyl] phosphorous acid ester.The described at least one that can be with multi-functional acrylate monomer in pentaerythritol triacrylate, Viscoat 295,1,4 butanediol diacrylate.
In stepb, by high-speed mixer, premixed solution and polypropylene and polystyrene are mixed to get mixture.Described organic solvent is at least one in ethanol, acetone, chloroform, and the weight ratio of described initiator and described organic solvent is 1:30 ~ 1:180.
In step c, described mixture can be added in screw extrusion press from opening for feed with the speed of 1kg/h ~ 10kg/h.The quality of the carbonic acid gas of described above-critical state accounts for 4% ~ 15% of the total mass of described mixture.The injection pressure of the carbonic acid gas of described above-critical state is 8MPa ~ 18MPa.The temperature in the first half district of the screw rod of described screw extrusion press is 185 DEG C ~ 210 DEG C, and the temperature in the later half district of screw rod is 150 DEG C ~ 185 DEG C.
Under the effect of initiator, the polypropylene of described melting and polystyrene generation graft reaction, generate polypropylene grafted polystyrene, thus original position improves the consistency of polypropylene and polystyrene.Due to the carbonic acid gas passing into above-critical state at 1/5 ~ 1/3 place of described screw rod, temperature of reaction is significantly reduced, thus obviously inhibit the degraded of polymkeric substance in reaction process, and then improve the percentage of grafting of polypropylene grafted polystyrene.Preferably, the carbonic acid gas of above-critical state is passed at 1/4 place of described screw rod, the preliminary mixing of each component in the abundant melting and mixture of the prepolymer of the carbonic acid gas passing into above-critical state can be guaranteed like this, also can ensure that the carbonic acid gas of above-critical state has time enough dispersed and dissolves in the mixture simultaneously, thus reduce the temperature of reaction in the later half district of screw rod, promote the carrying out of graft reaction.
The present invention also provides a kind of and adopts above-mentioned preparation method to obtain polypropylene/polystyrene alloy.The dispersed phase size of described polypropylene/polystyrene alloy is 0.1 μm ~ 3 μm, and interfacial tension is 0.5mN/m ~ 4mN/m.
Compared to prior art, present method does not need additionally to add compatilizer, but generates polypropylene grafted polystyrene by reactive extrursion method, thus original position improves the consistency of polypropylene and polystyrene, the polypropylene/polystyrene alloy of excellent.In addition, by passing into the carbonic acid gas of above-critical state at 1/5 ~ 1/3 place of described screw rod, temperature of reaction is significantly reduced, and (temperature in the first half district of screw rod is 185 DEG C ~ 210 DEG C, the temperature in the later half district of screw rod is 150 DEG C ~ 185 DEG C), effectively inhibit the degraded of polymkeric substance in reaction process, substantially increase the grafting ability of polypropylene and polystyrene, thus significantly improve the consistency of polypropylene and polystyrene.Concrete, in reaction process, the carbonic acid gas of above-critical state increases the free volume of melt polypropylene and polystyrene melt, effectively reduces the cage effect of polypropylene macromolecular radical and polystyrene macromolecular free radical, add both reaction probabilities, thus improve percentage of grafting; Meanwhile, the carbonic acid gas of above-critical state possesses the density of liquid and the spread coefficient of gas, can be used as the carrier of reaction member, also can increase the probability of polypropylene macromolecular radical and polystyrene macromolecular free radical reaction; In addition, the carbonic acid gas of above-critical state reduces the viscosity of polymer melt, thus reduces temperature of reaction, restrained effectively the degraded of polymkeric substance, thus obtains that degradation rate is low, consistency good and the polypropylene/polystyrene alloy of excellent property.The method technique is simple, energy consumption is low, and gained polypropylene/polystyrene alloy all shows good characteristic in processing characteristics and mechanical property etc.
Below in conjunction with specific embodiment, the preparation method to polypropylene/polystyrene alloy of the present invention is described:
Embodiment 1:
Take 0.1 part of dibenzoyl peroxide, 0.2 part of four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and 3 parts of 1,6 hexanediol diacrylates;
By dibenzoyl peroxide, four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, 1,6-hexanediyl ester adds pre-mixing in 5mL acetone and obtains premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator dibenzoyl peroxide and acetone is 1:70;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 40r/min, and the first half district temperature of screw rod is set to 190 DEG C, and the later half district temperature of screw rod is set to 165 DEG C; Inject the carbonic acid gas of 5 weight part above-critical states at 1/4 place of screw rod, injection pressure is set to 10MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 2:
Take 0.08 part of dicumyl peroxide, 0.1 part of sulfo-diethylene two [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic ester] and 5 parts of Viscoat 295s;
By dicumyl peroxide, the two [3-(3 of sulfo-diethylene, 5-di-tert-butyl-hydroxy phenyl) propionic ester] and Viscoat 295 add pre-mixing in 3mL ethanol and obtain premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator dicumyl peroxide and ethanol is 1:60;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 70r/min, and the first half district temperature of screw rod is set to 205 DEG C, and the later half district temperature of screw rod is set to 158 DEG C; Inject the carbonic acid gas of 10 weight part above-critical states at 1/3 place of screw rod, injection pressure is set to 14MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 3:
Take 0.3 part of di-t-butyl peroxide, 0.2 part of N, N'-pair-(3-(3,5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine and 4 parts of 1,4 butanediol diacrylates;
By di-t-butyl peroxide, N, N'-pair-(3-(3,5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine and 1,4-butylene glycol diacrylate adds pre-mixing in 20mL acetone and obtains premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, obtain mixture with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator di-t-butyl peroxide and acetone is 1:100;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 60r/min, and the first half district temperature of screw rod is set to 200 DEG C, and the later half district temperature of screw rod is set to 160 DEG C; Inject the carbonic acid gas of 12 weight part above-critical states at 1/5 place of screw rod, injection pressure is set to 14MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 4:
Take 0.05 part of di-t-butyl peroxide, 0.5 part of N, N'-pair-(3-(3,5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine and 5 parts of 1,4 butanediol diacrylates;
By di-t-butyl peroxide, N, N'-pair-(3-(3,5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine and 1,4-butylene glycol diacrylate adds pre-mixing in 8mL chloroform and obtains premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, obtain mixture with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator di-t-butyl peroxide and chloroform is 1:150;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 90r/min, and the first half district temperature of screw rod is set to 200 DEG C, and the later half district temperature of screw rod is set to 150 DEG C; Inject the carbonic acid gas of 10 weight part above-critical states at 1/4 place of screw rod, injection pressure is set to 10MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 5:
Take 0.1 part of peroxide acetic acid butyl ester, 0.4 part of β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester and 2 parts of pentaerythritol triacrylates;
By peroxide acetic acid butyl ester, part β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester and pentaerythritol triacrylate add pre-mixing in 10mL ethanol and obtain premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator peroxide acetic acid butyl ester and ethanol is 1:50;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 70r/min, and the first half district temperature of screw rod is set to 195 DEG C, and the later half district temperature of screw rod is set to 160 DEG C; Inject the carbonic acid gas of 8 weight part above-critical states at 1/5 place of screw rod, injection pressure is set to 12MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 6:
Take 0.02 part of peroxy dicarbonate two (4-tertiary butyl caproic acid), 0.1 part of three [2,4-di-tert-butyl-phenyl] phosphorous acid ester and 4 part of penta tetrol triacrylate;
By peroxy dicarbonate two (4-tertiary butyl caproic acid), three [2,4-di-tert-butyl-phenyl] phosphorous acid ester and penta tetrol triacrylate add pre-mixing in 8mL chloroform and obtain premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, initiator peroxy dicarbonate two (4-tertiary butyl caproic acid) is 1:130 with the weight ratio of chloroform;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 100r/min, and the first half district temperature of screw rod is set to 200 DEG C, and the later half district temperature of screw rod is set to 155 DEG C; Inject the carbonic acid gas of 15 weight part above-critical states at 1/3 place of screw rod, injection pressure is set to 18MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 7:
Take 0.4 part of hydrogen phosphide cumene, 0.2 part of four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and 5 parts of Viscoat 295s;
By hydrogen phosphide cumene, four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester and Viscoat 295 add pre-mixing in 4mL acetone and obtain premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator hydrogen phosphide cumene and acetone is 1:70;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 80r/min, and the first half district temperature of screw rod is set to 210 DEG C, and the later half district temperature of screw rod is set to 175 DEG C; Inject the carbonic acid gas of 7 weight part above-critical states at 1/4 place of screw rod, injection pressure is set to 12MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Embodiment 8:
Take the two 2-ethylhexoate of 0.25 part of peroxy dicarbonate, 0.4 part of sulfo-diethylene two [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic ester] and 2 parts of 1,6 hexanediol diacrylates;
By two for peroxy dicarbonate 2-ethylhexoate, the two [3-(3 of sulfo-diethylene, 5-di-tert-butyl-hydroxy phenyl) propionic ester] and 1,6-hexanediyl ester adds pre-mixing in 20mL ethanol and obtains premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of the two 2-ethylhexoate of initiator peroxy dicarbonate and ethanol is 1:90;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 90r/min, and the first half district temperature of screw rod is set to 200 DEG C, and the later half district temperature of screw rod is set to 160 DEG C; Inject the carbonic acid gas of 12 weight part above-critical states at 1/4 place of screw rod, injection pressure is set to 16MPa, melt extrudes and obtains polypropylene/polystyrene alloy.
Comparative example 1:
0.1 part of dibenzoyl peroxide is added pre-mixing in 15mL acetone and obtains premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator dibenzoyl peroxide and acetone is 1:80;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 50r/min, and screw rod first half district temperature is set to 195 DEG C, and screw rod later half district temperature is set to 160 DEG C; Inject the carbonic acid gas of 10 weight part above-critical states at 1/4 place of screw rod, injection pressure is set to 18MPa, melt extrudes and obtains polypropylene/polystyrene blend.
Comparative example 2:
Take 0.2 part of dicumyl peroxide, 0.3 part of sulfo-diethylene two [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic ester and 4 parts of Viscoat 295s;
By dicumyl peroxide, the two [3-(3 of sulfo-diethylene, 5-di-tert-butyl-hydroxy phenyl) propionic ester and Viscoat 295 add pre-mixing in 10mL ethanol and obtain premixed solution, afterwards 70 parts of polypropylene, 30 parts of polystyrene and premixed solution are put into high-speed mixer, mixture is obtained with the speed of 300r/min mixing 10min, wherein, the weight ratio of initiator dicumyl peroxide and ethanol is 1:60;
Mixture is joined in screw extrusion press; Wherein, screw speed is set to 40r/min, and screw rod first half district temperature is set to 200 DEG C, and screw rod later half district temperature is set to 190 DEG C; Do not inject the carbonic acid gas of above-critical state, melt extrude and obtain polypropylene/polystyrene blend.
Dispersion pattern, interfacial tension and Mechanics Performance Testing are carried out to the product that embodiment 1 to 8, comparative example 1 and 2 obtain, the results are shown in Table 1.Wherein, pattern test is disperseed: adopt Hitachi-S4800 scanning electronic microscope; Interfacial tension is tested: adopt AntonPhysicaMCR-301 rotational rheometer; Tensile property is tested: adopt Instron5567 universal testing machine; Shock strength is tested: adopt XJ-50Z built-up type shock-testing machine.
Table 1
From table 1, relative to comparative example 1 and 2, the dispersed phase size of the polypropylene/polystyrene alloy that embodiment 1 to 8 obtains and interfacial tension all significantly reduce, and mechanical property significantly improves.This polypropylene/polystyrene alloy illustrating that this preparation method obtains has excellent consistency and mechanical property, is beneficial to commercial application.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a preparation method for polypropylene/polystyrene alloy, it comprises the steps:
A takes polypropylene 50 ~ 90 weight part, polystyrene 10 ~ 50 weight part, with multi-functional acrylate monomer 1 ~ 5 weight part, and oxidation inhibitor 0.1 ~ 0.5 weight part, initiator 0.01 ~ 0.5 weight part;
B adds premix in organic solvent by described obtain premixed solution with multi-functional acrylate monomer, oxidation inhibitor, initiator, then premixed solution and polypropylene and polystyrene are mixed to get mixture;
Described mixture adds in a screw extrusion press by c, and at the carbonic acid gas that 1/5 ~ 1/3 place of the screw rod of screw extrusion press passes into above-critical state, melt extrudes and obtain polypropylene/polystyrene alloy.
2. the preparation method of a polypropylene/polystyrene alloy as claimed in claim 1, it is characterized in that, organic solvent described in step b is at least one in ethanol, acetone, chloroform, and the weight ratio of described initiator and described organic solvent is 1:30 ~ 1:180.
3. a preparation method for polypropylene/polystyrene alloy as claimed in claim 1, is characterized in that, in step c, the temperature in the first half district of screw rod is 185 DEG C ~ 210 DEG C, and the temperature in the later half district of screw rod is 150 DEG C ~ 185 DEG C.
4. the preparation method of a polypropylene/polystyrene alloy as claimed in claim 1, it is characterized in that, the quality of the carbonic acid gas of above-critical state described in step c accounts for 4% ~ 15% of the total mass of described mixture, and the injection pressure of the carbonic acid gas of described above-critical state is 8MPa ~ 18MPa.
5. a preparation method for polypropylene/polystyrene alloy as claimed in claim 1, is characterized in that, passes into the carbonic acid gas of above-critical state in step c at 1/4 place of the screw rod of screw extrusion press.
6. the preparation method of a polypropylene/polystyrene alloy as claimed in claim 1, it is characterized in that, described polypropylene be homo-polypropylene, Co-polypropylene or both with arbitrary proportion mixing blend, described polyacrylic melting index is 0.1g/10min ~ 50g/10min (test condition is 2.16Kg/190 DEG C).
7. a preparation method for polypropylene/polystyrene alloy as claimed in claim 1, is characterized in that, the melting index of described polystyrene is 0.5g/10min ~ 20g/10min (test condition is 5.0Kg/200 DEG C).
8. the preparation method of a polypropylene/polystyrene alloy as claimed in claim 1, it is characterized in that, described initiator is at least one in dicumyl peroxide, dibenzoyl peroxide, di-t-butyl peroxide, peroxy dicarbonate two (4-tertiary butyl caproic acid), the two 2-ethylhexoate of peroxide acetic acid butyl ester, hydrogen phosphide cumene, peroxy dicarbonate.
9. the preparation method of a polypropylene/polystyrene alloy as claimed in claim 1, it is characterized in that, described oxidation inhibitor is 1, 6-hexanediyl ester, four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, N, N'-pair-(3-(3, 5-di-tert-butyl-hydroxy phenyl) propionyl) hexanediamine, two [the 3-(3 of sulfo-diethylene, 5-di-tert-butyl-hydroxy phenyl) propionic ester], β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester, three [2, 4-di-tert-butyl-phenyl] at least one in phosphorous acid ester, described is pentaerythritol triacrylate with multi-functional acrylate monomer, Viscoat 295, 1, at least one in 4-butylene glycol diacrylate.
10. adopt the polypropylene/polystyrene alloy as any one of claim 1 to 9 preparation method obtains, it is characterized in that, the dispersed phase size of described polypropylene/polystyrene alloy is 0.1 μm ~ 3 μm, and interfacial tension is 0.5mN/m ~ 4mN/m.
Priority Applications (1)
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| CN112674385A (en) * | 2020-12-09 | 2021-04-20 | 南京旭智材料科技有限公司 | Preparation method of novel environment-friendly cigarette filter tip |
| CN113024737A (en) * | 2021-04-07 | 2021-06-25 | 贵州大学 | Method for compatibilization of polypropylene/polyethylene blend |
| CN113430676A (en) * | 2021-05-18 | 2021-09-24 | 湖北民族大学 | Micro-nano fiber for medical and health protection and preparation method thereof |
| WO2024036855A1 (en) * | 2022-08-18 | 2024-02-22 | 上海锦湖日丽塑料有限公司 | Nano-compatibilized polypropylene-polystyrene composition and preparation method therefor |
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| CN113024737A (en) * | 2021-04-07 | 2021-06-25 | 贵州大学 | Method for compatibilization of polypropylene/polyethylene blend |
| CN113430676A (en) * | 2021-05-18 | 2021-09-24 | 湖北民族大学 | Micro-nano fiber for medical and health protection and preparation method thereof |
| CN113430676B (en) * | 2021-05-18 | 2022-08-19 | 湖北民族大学 | Micro-nano fiber for medical and health protection and preparation method thereof |
| WO2024036855A1 (en) * | 2022-08-18 | 2024-02-22 | 上海锦湖日丽塑料有限公司 | Nano-compatibilized polypropylene-polystyrene composition and preparation method therefor |
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