CN115948018A - Ionomer modified styrene thermoplastic elastomer and preparation method thereof - Google Patents
Ionomer modified styrene thermoplastic elastomer and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of thermoplastic elastomers, and discloses an ionomer modified styrene thermoplastic elastomer and a preparation method thereof, wherein the thermoplastic elastomer is prepared by SBCs, a free radical initiator, an unsaturated ionic bond modifier, an organosilicon antibacterial modifier, an antioxidant and an ultraviolet light stabilizer through high-speed mixing, extrusion and granulation.
Description
Technical Field
The invention relates to the technical field of thermoplastic elastomers, in particular to an ionomer-modified styrene thermoplastic elastomer and a preparation method thereof.
Background
Thermoplastic elastomers are a new type of polymeric materials that combine rubber elasticity with the melt flow and re-use properties of thermoplastics, and are known as third generation rubbers. The thermoplastic elastomers used at present are mostly styrenic thermoplastic elastomers, i.e. styrenic block copolymers, also known as SBCs, and styrene-butadiene-styrene block copolymer SBS and styrene-isoprene-styrene SIS block copolymer products, and hydrogenated products SEBS and SEPS of these two products are widely used. Different from the traditional vulcanized rubber material, due to the A-B-A type triblock structure of the block copolymer molecules, SBCs integrates the dispersed phase of the hard segment of polystyrene and the continuous phase of the soft segment of olefin copolymer, and ase:Sub>A special physical crosslinking network is formed between molecular chains by virtue of Van der Waals force, so that the block copolymer has the elasticity of rubber at normal temperature and the thermoplasticity of plastic at high temperature.
Although SBCs have excellent mechanical properties and reworkability, SBCs have poor antibacterial performance, cannot avoid the phenomena of bacterial adhesion, breeding and the like, are easy to cause bacterial infection, are difficult to apply to the field of medical instruments with extremely high antibacterial requirements, most medical instruments are usually required to be sterilized at high temperature after being used, the glass transition temperature of the SBCs is low and generally does not exceed 80 ℃, and the defects seriously limit the development and application of the SBCs in the field of the medical instruments. In order to solve the problems, chinese patent with application number CN201810533949.6 discloses a high-strength thermoplastic elastomer for a charging pile cable and a preparation method thereof, components of the thermoplastic elastomer are reasonably compatible, reinforcing fillers such as polyphosphazene and zirconium phosphate are added into a styrene elastomer, and the high-temperature resistance of the thermoplastic elastomer is effectively enhanced by utilizing the synergistic effect of the polyphosphazene and the zirconium phosphate, but the problems of phase separation and the like caused by poor compatibility are difficult to avoid by physical addition, and the antibacterial modification of the styrene thermoplastic elastomer is not realized, so that the development of the styrene thermoplastic elastomer with good antibacterial performance and heat resistance has great significance for the development of the styrene thermoplastic elastomer in the field of medical devices.
Disclosure of Invention
The invention aims to provide an ionomer modified styrene thermoplastic elastomer and a preparation method thereof, and solves the following technical problems:
(1) Solves the problem of poor antibacterial performance of the styrene thermoplastic elastomer.
(2) Solves the problem of poor heat resistance of the styrene thermoplastic elastomer.
The purpose of the invention can be realized by the following technical scheme:
an ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SBCs, 0.2-5 parts of free radical initiator, 0.5-10 parts of unsaturated ionic bond modifier, 1-3 parts of organosilicon antibacterial modifier, 0.5-2 parts of antioxidant 1010 and 0.1-1 part of ultraviolet light stabilizer UV-531;
the organosilicon antibacterial modifier is prepared by introducing epoxy groups into a vinyl-terminated dimethyl hydrogen-containing polysiloxane molecular chain and then connecting long-chain tertiary amine molecules.
Further, any one of SBS, SIS, or SEBS.
Further, the radical initiator is any one of benzoyl peroxide, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, tert-butyl peroxybenzoate, dicumyl peroxide, tert-butylcumyl peroxide, 2,5-dimethyl-2,5 bis (tert-butylperoxy) hexane, di-tert-butyl peroxide, and di-tert-butylperoxyisopropylbenzene.
Further, the unsaturated ion modifier is any one of zinc acrylate, calcium acrylate, aluminum acrylate, iron acrylate, magnesium acrylate, lithium acrylate, sodium acrylate, potassium acrylate, zinc methacrylate, calcium methacrylate, aluminum methacrylate, iron methacrylate, magnesium methacrylate, lithium methacrylate, sodium methacrylate, and potassium methacrylate.
Further, the preparation method of the organosilicon antibacterial modifier comprises the following steps:
s1: mixing vinyl-terminated dimethyl hydrogen polysiloxane, glycidol and toluene, stirring uniformly, adding a catalyst dropwise, introducing nitrogen, placing the system in a condition of 90-100 ℃, stirring for 6-12h, distilling under reduced pressure to evaporate a solvent and low-boiling-point substances after the reaction is finished, and discharging to obtain an intermediate;
s2: mixing the intermediate, long-chain tertiary amine molecules and absolute ethyl alcohol, refluxing for 2-4h at 60-70 ℃, dropwise adding glacial acetic acid to adjust the pH of the reaction system to 6-7, continuously reacting for 3-6h, carrying out reduced pressure distillation to evaporate the solvent and low-boiling-point substances, and purifying to obtain the organic silicon antibacterial modifier.
According to the technical scheme, under the action of a catalyst, a Si-H bond in a vinyl-terminated dimethyl hydrogen-containing polysiloxane structure can react with a hydroxyl in a glycidol structure to prepare the vinyl-terminated dimethyl hydrogen-containing polysiloxane containing an epoxy group in the structure, and the epoxy group can perform a ring-opening addition reaction with a tertiary amine group in a long-chain tertiary amine molecular structure to prepare the vinyl-terminated dimethyl hydrogen-containing polysiloxane containing a long-chain quaternary ammonium salt functional group in the structure, namely the organosilicon antibacterial modifier.
Further, in step S1, the hydrogen content of the vinyl-terminated dimethyl hydrogen-containing polysiloxane is 0.1% to 1%, and the vinyl content is 2% to 10%.
Further, in step S1, the catalyst is trifluoroacetic acid, and the amount of the trifluoroacetic acid is 0.4% to 0.6% of the total amount of the vinyl-terminated dimethyl hydrogen-containing polysiloxane and glycidol.
Further, in step S2, the long-chain tertiary amine molecule is any one of N, N-dimethyl N-octylamine, N-dimethyldodecylamine, or N, N-dimethylhexadecylamine.
A preparation method of an ionomer-modified styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SBCs, a free radical initiator, an unsaturated ionic bond modifier and an organic silicon antibacterial modifier, pouring the mixture into a double-screw extruder, and blending and modifying at 160-230 ℃ to obtain a modified SBCs material;
step two: and pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, extruding and granulating the mixture at the temperature of 150-260 ℃ by using a double-screw extruder, and cutting the master batch to obtain the styrene thermoplastic elastomer.
According to the technical scheme, under the action of a free radical initiator and in a high-temperature environment, unsaturated alkenyl functional groups in the structures of the unsaturated ionic bond modifier and the organosilicon antibacterial modifier can perform free radical polymerization with SBCs, so that the ionic bond and the organosilicon antibacterial modifier are introduced into the structures of the SBCs and then mixed with other auxiliaries for extrusion to prepare the styrene thermoplastic elastomer.
Further, in the second step, the length-diameter ratio of the double-screw extruder is 30-45, and the screw rotating speed is 250-400r/min.
The invention has the beneficial effects that:
(1) According to the invention, a free radical grafting technology is adopted, a large number of ionic bonds are introduced into SBCs, and the electrostatic attraction generated among the ionic bonds can greatly increase intermolecular force, so that the heat resistance of the SBCs is improved; the ionic bonds also have high-temperature reversibility, so that the SBCs still have thermoplasticity and repeatable processability; in addition, the introduction of the ionic bond can improve the tensile strength, the tearing strength and the permanent deformation resistance of the SBCs.
(2) According to the invention, a free radical grafting technology is adopted, and a large amount of safe and nontoxic halogen-free organic silicon quaternary ammonium salt antibacterial modifier is introduced into SBCs, so that the presence of the organic silicon quaternary ammonium salt antibacterial modifier can endow the SBCs with excellent antibacterial performance, and the organic silicon structure can generate a synergistic effect with ionic bonds, thereby further enhancing the comprehensive performances such as tensile strength, tear strength, heat resistance and the like of the SBCs; in addition, the organosilicon antibacterial modifier is introduced into the SBCs matrix in a free radical grafting manner, so that the interfacial properties of two phases can be enhanced, the precipitation of an antibacterial agent is avoided, and the antibacterial long-acting property of the SBCs is further realized.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SBS, 0.2 part of diisopropylphenyl peroxide, 0.5 part of zinc methacrylate, 1 part of organosilicon antibacterial modifier, 0.5 part of antioxidant 1010 and 0.1 part of ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SBS, diisopropyl phenyl peroxide, zinc methacrylate and organic silicon antibacterial modifier, pouring into a double-screw extruder, and blending and modifying at 160 ℃ to obtain modified SBS material;
step two: pouring the modified SBS material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 30 and the rotating speed of the screws to be 250r/min, extruding and granulating the mixture at the temperature of 200 ℃, and cutting master batches to obtain the styrene thermoplastic elastomer.
The preparation method of the organosilicon antibacterial modifier comprises the following steps:
s1: mixing 5g of vinyl-terminated dimethyl hydrogen polysiloxane, 3g of glycidol and toluene, uniformly stirring, dropwise adding 0.05g of trifluoroacetic acid, introducing nitrogen, placing the system at 100 ℃, stirring for 9 hours, after the reaction is finished, distilling under reduced pressure to evaporate the solvent and low-boiling-point substances, and discharging to obtain an intermediate; wherein the hydrogen content of the vinyl-terminated dimethyl hydrogen-containing polysiloxane is 0.1 to 1 percent, and the vinyl content is 2 to 10 percent; weighing 0.5g of an intermediate sample, pouring the intermediate sample into a reactor, adding 50mL of 20% tetraethylammonium bromide acetic acid solution and 2-3 drops of 1% crystal violet indicator, standing for 4h, titrating by using 0.1mol/L perchloric acid-glacial acetic acid standard solution until the solution changes color, carrying out a blank experiment, and calculating the epoxy group content in the intermediate sample according to the following formula:
in the formula V 1 Is the volume of standard solution consumed for titrating the intermediate sample, mL; v 2 The volume of the standard solution consumed in the blank experiment, mL; w is sample mass, g; c, the concentration of a standard solution, mol/L; the content of epoxy groups X in the intermediate sample is tested to be 1.397mmol/g;
s2: mixing 2g of the intermediate, 1.5g of N, N-dimethylhexadecylamine and absolute ethyl alcohol, refluxing for 3 hours at the temperature of 60 ℃, dropwise adding glacial acetic acid to adjust the pH value of a reaction system to 6, continuously reacting for 4 hours, distilling under reduced pressure to evaporate a solvent and a low-boiling-point substance, and purifying to obtain the organic silicon antibacterial modifier; the nitrogen content of the organosilicon antibacterial modifier is 8.15 percent by testing through carrying out element analysis by using an SDCHN435 type element analyzer, and the nitrogen content is supposed to be a nitrogen source provided by a quaternary ammonium salt functional group formed by the reaction of an epoxy group in an intermediate structure and a tertiary amine group in an N, N-dimethyl hexadecylamine structure.
Example 2
An ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SIS, 2 parts of di-tert-butyl cumyl peroxide, 5 parts of sodium methacrylate, 2 parts of an organic silicon antibacterial modifier, 1 part of antioxidant 1010 and 0.5 part of an ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SIS, di-tert-butyl cumene peroxide, sodium methacrylate and an organic silicon antibacterial modifier, pouring the mixture into a double-screw extruder, and blending and modifying the mixture at the temperature of 200 ℃ to obtain a modified SBCs material;
step two: pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 40 and the rotating speed of the screws to be 300r/min, extruding and granulating the mixture at the temperature of 200 ℃, and cutting master batches to obtain the styrene thermoplastic elastomer.
The preparation method of the organosilicon antibacterial modifier is the same as that of the example 1.
Example 3
An ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SEBS, 5 parts of diisopropylphenyl peroxide, 10 parts of zinc methacrylate, 3 parts of organic silicon antibacterial modifier, 2 parts of antioxidant 1010 and 1 part of ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SEBS, diisopropylphenyl peroxide, zinc methacrylate and an organic silicon antibacterial modifier, pouring the mixture into a double-screw extruder, and blending and modifying at 230 ℃ to obtain a modified SBCs material;
step two: and (2) pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 45 and the rotating speed of the screws to be 400r/min, extruding and granulating the mixture at the temperature of 260 ℃, and cutting the master batch to obtain the styrene thermoplastic elastomer.
The preparation method of the organosilicon antibacterial modifier is the same as that of the embodiment 1.
Comparative example 1
An ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SIS, 2 parts of di-tert-butyl cumyl peroxide, 5 parts of sodium methacrylate, 1.5 parts of vinyl-terminated dimethyl hydrogen-containing polysiloxane, 1 part of antioxidant 1010 and 0.5 part of ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SIS, di-tert-butyl cumene peroxide, sodium acrylate and vinyl-terminated dimethyl hydrogen polysiloxane, pouring the mixture into a double-screw extruder, and blending and modifying the mixture at 200 ℃ to obtain a modified SBCs material;
step two: pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 35 and the rotating speed of the screws to be 300r/min, extruding and granulating the mixture at the temperature of 200 ℃, and cutting master batches to obtain the styrene thermoplastic elastomer.
Comparative example 2
An ionomer modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SIS, 2 parts of di-tert-butyl cumyl peroxide, 5 parts of sodium methacrylate, 1 part of antioxidant 1010 and 0.5 part of ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SIS, di-tert-butyl cumyl peroxide and sodium polyacrylate, pouring the mixture into a double-screw extruder, and blending and modifying the mixture at 200 ℃ to obtain a modified SBCs material;
step two: pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 35 and the rotating speed of the screws to be 300r/min, extruding and granulating the mixture at the temperature of 200 ℃, and cutting master batches to obtain the styrene thermoplastic elastomer.
Comparative example 3
A modified styrene thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of SIS, 2 parts of di-tert-butyl cumyl peroxide, 1.5 parts of organic silicon antibacterial modifier, 1 part of antioxidant 1010 and 0.5 part of ultraviolet light stabilizer UV-531;
the preparation method of the styrene thermoplastic elastomer comprises the following steps:
the method comprises the following steps: mixing SIS, di-tert-butyl cumene peroxide and an organic silicon antibacterial modifier, pouring the mixture into a double-screw extruder, and blending and modifying the mixture at the temperature of 200 ℃ to obtain a modified SBCs material;
step two: pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, using a double-screw extruder, setting the length-diameter ratio of the double-screw extruder to be 35 and the rotating speed of the screws to be 300r/min, extruding and granulating the mixture at the temperature of 200 ℃, and cutting master batches to obtain the styrene thermoplastic elastomer.
The preparation method of the organosilicon antibacterial modifier is the same as that of the embodiment 1.
Performance detection
a. The thermoplastic elastomers prepared in the embodiments 1-3 and the comparative examples 1-3 are injection molded into test samples meeting the specification, and the test samples are treated at normal temperature and 70 ℃ for 12 hours to obtain the tensile strength and elongation at break according to the reference standard GB/T528-2009; the permanent deformation resistance of a sample after being treated at normal temperature and high temperature of 70 ℃ for 12 hours is tested by referring to a standard ISO 2285-2019; with reference to the standard GB/T12829-2006, the tear strength of the sample after being treated at normal temperature and high temperature of 70 ℃ for 12h is tested, and the test results are shown in the following table:
the data in the table above prove that the thermoplastic elastomers prepared in examples 1 to 3 of the present invention and comparative example 1 have excellent tensile properties, show higher tensile property values, and have significantly improved tear strength and permanent set resistance, and further have lower reduction of tensile strength at 70 ℃ and significantly improved elongation at break, so that they have excellent heat resistance. The thermoplastic elastomer prepared in the comparative example 2 is not added with vinyl-terminated dimethyl hydrogen polysiloxane for free radical polymerization grafting modification, and the comprehensive performance of the thermoplastic elastomer cannot be improved by utilizing the synergistic effect between polysiloxane and ionic bonds, so that the thermoplastic elastomer has general tensile property, heat resistance, tear strength, permanent deformation resistance and other performances. The thermoplastic elastomer prepared in comparative example 3 was not grafted with ionic bonds, and thus the overall performance was poor.
b. The thermoplastic elastomers prepared in examples 1 to 3 and comparative examples 1 to 3 of the present invention were injection-molded into round specimens having a diameter of 10mm, 0.5mL of Staphylococcus aureus was transferred to beef broth, incubated at 37 ℃ for 24 hours, and the broth concentration was diluted to 10 -5 CFU/mL to be prepared into bacteria liquid to be detected, sucking 0.5mL of bacteria liquid to be detected to the surface of the sample, continuously culturing for 6h at 37 ℃, washing the sample by using sterilized water subjected to sterilization operation, collecting the washing liquid, sucking 0.5mL of the washing liquid, placing the sample on a culture medium for culturing for 12h, observing the colony number, and utilizing a formula [ (blank group colony number-experimental group colony number)/blank group colony number ]]The antibacterial rate is calculated, meanwhile, a blank experiment is carried out, and the test results are shown in the following table:
the data in the table above prove that the thermoplastic elastomers prepared in examples 1-3 and comparative example 3 of the present invention have high antibacterial rate and good antibacterial performance, but the thermoplastic elastomers prepared in comparative examples 1-2 are not modified with organosilicon antibacterial modifier, so the antibacterial performance is poor.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (10)
1. An ionomer-modified styrene thermoplastic elastomer is characterized by comprising the following raw materials in parts by weight: 100 parts of SBCs, 0.2-5 parts of free radical initiator, 0.5-10 parts of unsaturated ionic bond modifier, 1-3 parts of organosilicon antibacterial modifier, 0.5-2 parts of antioxidant 1010 and 0.1-1 part of ultraviolet light stabilizer UV-531;
the organosilicon antibacterial modifier is prepared by introducing epoxy groups into a vinyl-terminated dimethyl hydrogen-containing polysiloxane molecular chain and then connecting long-chain tertiary amine molecules.
2. The ionomer-modified styrenic thermoplastic elastomer of claim 1, wherein the SBCs is any one of SBS, SIS, or SEBS.
3. An ionomer-modified styrenic thermoplastic elastomer as claimed in claim 1, wherein the radical initiator is any one of benzoyl peroxide, 2,5-dimethyl-2,5-di (benzoyl peroxide) hexane, 1,1-di-t-butyl peroxide-3,3,5-trimethylcyclohexane, t-butyl peroxybenzoate, diisopropylphenyl peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5 bis (t-butylperoxy) hexane, di-t-butyl peroxide or di-t-butylcumyl peroxide.
4. The ionomer-modified styrenic thermoplastic elastomer according to claim 1, wherein the unsaturated ionic modifier is any one of zinc acrylate, calcium acrylate, aluminum acrylate, iron acrylate, magnesium acrylate, lithium acrylate, sodium acrylate, potassium acrylate, zinc methacrylate, calcium methacrylate, aluminum methacrylate, iron methacrylate, magnesium methacrylate, lithium methacrylate, sodium methacrylate, or potassium methacrylate.
5. The ionomer-modified styrene-based thermoplastic elastomer according to claim 1, wherein the silicone antibacterial modifier is prepared by the following method:
s1: mixing vinyl-terminated dimethyl hydrogen polysiloxane, glycidol and toluene, stirring uniformly, adding a catalyst dropwise, introducing nitrogen, placing the system in a condition of 90-100 ℃, stirring for 6-12h, distilling under reduced pressure to evaporate a solvent and low-boiling-point substances after the reaction is finished, and discharging to obtain an intermediate;
s2: and (3) mixing the intermediate, long-chain tertiary amine molecules and absolute ethyl alcohol, refluxing for 2-4h at 60-70 ℃, dropwise adding glacial acetic acid to adjust the pH value of the reaction system to 6-7, continuously reacting for 3-6h, after the reaction is finished, distilling under reduced pressure to evaporate the solvent and low-boiling-point substances, and purifying to obtain the organic silicon antibacterial modifier.
6. The ionomer-modified styrenic thermoplastic elastomer according to claim 5, wherein in step S1, the vinyl terminated dimethyl hydrogenpolysiloxane has a hydrogen content of 0.1% to 1% and a vinyl content of 2% to 10%.
7. The ionomer-modified styrenic thermoplastic elastomer according to claim 5, wherein the catalyst is trifluoroacetic acid in an amount of 0.4 to 0.6% of the total amount of the vinyl-terminated dimethyl hydrogen polysiloxane and glycidol used in step S1.
8. The ionomer-modified styrenic thermoplastic elastomer of claim 5, wherein in step S2, the long-chain tertiary amine molecule is any one of N, N-dimethyl N-octylamine, N-dimethyl dodecylamine, or N, N-dimethyl hexadecylamine.
9. A process for preparing an ionomer-modified styrenic thermoplastic elastomer according to claim 1, comprising the steps of:
the method comprises the following steps: mixing SBCs, a free radical initiator, an unsaturated ionic bond modifier and an organic silicon antibacterial modifier, pouring the mixture into a double-screw extruder, and blending and modifying at 160-230 ℃ to obtain a modified SBCs material;
step two: and pouring the modified SBCs material, the antioxidant 1010 and the ultraviolet light stabilizer UV-531 into a high-speed mixer, uniformly mixing, extruding and granulating the mixture at the temperature of 150-260 ℃ by using a double-screw extruder, and cutting the master batch to obtain the styrene thermoplastic elastomer.
10. The method for preparing an ionomer-modified styrenic thermoplastic elastomer as claimed in claim 9, wherein in the second step, the length-diameter ratio of the twin-screw extruder is 30-45 and the screw rotation speed is 250-400r/min.
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