CN112063063B - Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding products - Google Patents

Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding products Download PDF

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CN112063063B
CN112063063B CN202010818090.0A CN202010818090A CN112063063B CN 112063063 B CN112063063 B CN 112063063B CN 202010818090 A CN202010818090 A CN 202010818090A CN 112063063 B CN112063063 B CN 112063063B
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polyethylene wax
nano silver
sebs
silver antibacterial
antibacterial material
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CN112063063A (en
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林辉
吴院生
吴峰
简露琴
钱浩
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Xiamen Toppla Material Technology Co ltd
Xiamen Make Security Technology Co Ltd
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Xiamen Make Security Technology Co Ltd
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    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
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    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2003/0806—Silver
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    • C08L2205/00—Polymer mixtures characterised by other features
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Abstract

The invention discloses a preparation method of a polyethylene wax/SEBS-based nano silver antibacterial material, which comprises the steps of firstly preparing a sulfhydrylated polymer, then uniformly mixing the sulfhydrylated modified polymer and a nano silver antibacterial agent, and then adding a compatilizer SEBS resin. Compared with the prior art, the invention utilizes the full complexation of the mercapto group and the nano silver, can realize the full dispersion and tight combination of the nano silver antibacterial agent in the material, realizes the surface enrichment effect of the nano silver antibacterial agent, and can effectively improve the bonding strength of the antibacterial material and the polystyrene resin matrix by introducing the compatilizer. The invention also discloses an application of the polyethylene wax/SEBS-based nano silver antibacterial material in polystyrene injection molding, the antibacterial material is used for injection molding of polystyrene products, and the nano silver antibacterial agent is automatically enriched on the surface of the products by virtue of the difference of melt viscosity, so that the surface antibacterial effect of the polystyrene products is improved, and the consumption of the nano silver antibacterial agent is reduced.

Description

Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding products
Technical Field
The invention relates to the technical field of functional polymers, in particular to a preparation method of a polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of the material in polystyrene injection molding products.
Background
Polymer products have been widely used in various aspects of the life of the national world, but the polymer products themselves do not have antibacterial properties. With the pursuit of healthy life, antibacterial products have become an important branch of the current development of material science. Antibacterial is a control measure that inhibits the growth of bacteria (microorganisms) and prevents the proliferation of bacteria. The antibacterial performance of the conventional antibacterial product is mainly realized by doping functional antibacterial materials such as antibacterial agents and the like into the product, and bacteria on the surface of the material are killed or inhibited from propagating through surface contact, so that the long-term sanitation of the product is maintained. In China, along with the continuous increase of economy, the demand for antibacterial products is becoming wider and wider.
At present, the antibacterial agents are mainly classified into inorganic antibacterial agents and organic antibacterial agents, wherein the antibacterial performance of nano silver products is very excellent, and the nano silver products are one of antibacterial agents with the best antibacterial efficiency and broad-spectrum antibacterial effect in recent years. At present, a large amount of nano silver technology is adopted in plastic products to improve the antibacterial performance of polymer products. However, the nano silver antibacterial agent has high cost and belongs to a contact antibacterial agent, so that the use amount of the nano silver antibacterial agent is reduced while the antibacterial effect is maintained, and the nano silver antibacterial agent becomes a key problem in popularization in plastic products at present.
Polystyrene resin is a polymer product widely used in general-purpose resins at present, and products of the polystyrene resin are very rich, for example HIPS, ABS, SBS, SEBS, SEPS resin products, and the polystyrene resin has been widely applied to various aspects of plastic products, shoes, caps, clothes, household appliances, plastic furniture and the like.
Under the situation that the global epidemic prevention mode is becoming severe at present, the antibacterial performance of the product is improved, and the product has a very positive effect on guaranteeing healthy life. However, the conventional nano silver antibacterial agent is large in dosage in polystyrene resin, and a large amount of nano silver antibacterial agent distributed in the resin does not play a role in antibacterial effect, and only the nano silver antibacterial agent on the surface can play a role in antibacterial and sterilizing effectively. Therefore, how to realize the selective surface migration effect of the nano silver antibacterial agent in the conventional process becomes the key point and the difficulty of the research of antibacterial products of polystyrene resin matrixes.
In view of this, the present inventors have conducted intensive studies.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of a polyethylene wax/SEBS-based nano-silver antibacterial material with high dispersibility and surface enrichment capability.
The invention further aims to provide an application of the polyethylene wax/SEBS-based nano silver antibacterial material with high dispersibility and surface enrichment capability in polystyrene injection molding products.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a preparation method of polyethylene wax/SEBS-based nano silver antibacterial material comprises the steps of firstly preparing sulfhydrylated polyethylene wax, then uniformly mixing sulfhydrylated modified polyethylene wax and nano silver antibacterial agent, and then adding a compatilizer which is SEBS resin, thus finally obtaining the polyethylene wax/SEBS-based nano silver antibacterial material.
Further, the nano silver antibacterial agent is nano silver particles, and comprises nano silver simple substance particles and/or nano silver particles loaded by a carrier.
Further, the nano silver particles comprise nano silver particles loaded by a carrier, and the nano silver particles loaded by the carrier comprise Ag-CuO, ag-ZnO, ag-TiO and Ag-Al 2 O 3 At least one of them.
Further, in the preparation of the sulfhydrylated polyethylene wax, the polyethylene wax is subjected to epoxidation modification, and then the sulfhydryl ethylamine is added into the polyethylene wax subjected to epoxidation modification to obtain the sulfhydrylated polyethylene wax.
Further, the molar ratio of mercapto groups to epoxy groups in the mercapto polyethylene wax is 0.2 to 0.73.
Further, in the polyethylene wax/SEBS-based nano silver antibacterial material, the silver content is 10-35 wt%.
Further, the polyethylene wax has a number average molecular weight of 6000 to 15000.
Further, the SEBS resin has a viscosity of less than 1500mpa.s in a 10wt% toluene solution at 25 ℃.
Further, the basic structural formula of the polyethylene wax/SEBS-based nano silver antibacterial material is as follows:
after the technical scheme is adopted, the preparation method of the polyethylene wax/SEBS-based nano silver antibacterial material has the following beneficial effects:
(1) The stable dispersion of the nano silver antibacterial agent in the polyethylene wax is realized through the strong interaction (complexation) between the mercapto group in the mercapto polyethylene wax and the nano silver antibacterial agent, the purposes of reducing agglomeration and improving the dispersibility are achieved, and the uniform and stable dispersion of the nano silver antibacterial agent in the material can be realized.
(2) The prepared polyethylene wax/SEBS-based nano silver antibacterial material reduces the dosage of the nano silver antibacterial agent under the condition of not reducing the antibacterial effect, and can reduce the dosage by 10-23% under the general condition.
(3) The prepared material not only has antibacterial effect, but also can partially adjust the melt fluidity of polystyrene resin and improve the processing fluidity of polystyrene and composite materials thereof by adopting low-viscosity resin (SEBS) as a base material.
(4) The compatibility agent, namely the hydrogenated styrene-butadiene block copolymer (SEBS), is introduced, so that the compatibility and the effective bonding strength of the polyvinyl nano silver antibacterial agent and polystyrene resin matrixes (PS, ABS and the like) are effectively improved, and the effective antibacterial life of polystyrene products can be prolonged.
The application of the polyethylene wax/SEBS-based nano silver antibacterial material in polystyrene injection molding products is that the polyethylene wax/SEBS-based nano silver antibacterial material is used for injection molding of polystyrene products, and the polyethylene wax/SEBS-based nano silver antibacterial material is melt blended with polystyrene resin and then injection molded.
After the technical scheme is adopted, the application of the polyethylene wax/SEBS-based nano silver antibacterial material in polystyrene injection molding products has the following beneficial effects: in the injection molding process, the effect of automatically enriching the nano silver antibacterial agent to the surface of a product is realized by utilizing the difference between the melt viscosities of the polyethylene wax/SEBS-based nano silver antibacterial material and the matrix resin, so that the surface antibacterial effect of polystyrene products is improved, and the dosage of the nano silver antibacterial agent is reduced. In addition, by introducing a compatilizer-hydrogenated styrene-butadiene block copolymer (SEBS), the compatibility and the effective bonding strength of the polyethylene-based nano silver antibacterial agent and polystyrene resin matrixes (PS, ABS and the like) are effectively improved, the nano silver antibacterial agent is prevented from falling off from the surface of a product, and the antibacterial service life of the product is prolonged.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
Example 1
The invention relates to a polyethylene wax/SEBS-based nano silver antibacterial material, which has the following basic structural formula:
the polyethylene wax/SEBS-based nano silver antibacterial material is suitable for injection molding of polystyrene products.
According to the polyethylene wax/SEBS-based nano silver antibacterial material, through the strong interaction between the mercapto group in the mercapto polyethylene wax and the nano silver particles, the stable dispersion of the nano silver particles in the polyethylene wax is realized, the purposes of reducing agglomeration and improving the dispersibility of the nano silver particles are achieved, namely the nano silver antibacterial material has high dispersibility and high stability.
After the antibacterial material is added into the polystyrene resin product, in the injection molding process, the enrichment effect of the nano silver antibacterial agent on the surface of the product is realized by utilizing the difference of melt viscosities of the polyethylene wax/SEBS-based nano silver antibacterial material and the matrix resin, so that the surface antibacterial effect of the polystyrene product is improved, and the consumption of the nano silver antibacterial agent is reduced. In addition, by introducing a compatilizer-hydrogenated styrene-butadiene block copolymer (SEBS), the compatibility and the effective bonding strength of the polyethylene-based nano silver antibacterial agent and polystyrene resin matrixes (PS, ABS and the like) are effectively improved, the nano silver antibacterial agent is prevented from falling off from the surface of a product, and the antibacterial service life of the product is prolonged.
Compared with matrix resin, the antibacterial material has the characteristics that the melt viscosity is tens of times smaller, and components with smaller melt viscosity are easy to enrich on the surface of a die in the pressure flow process of the polymer, so that the effect of preferential enrichment of the nano silver antibacterial agent on the surface of a polystyrene product is realized, and the aims of reducing the dosage of the nano silver antibacterial agent and improving the antibacterial performance of the nano silver antibacterial agent are fulfilled.
Example 2
The invention relates to a preparation method of polyethylene wax/SEBS-based nano silver antibacterial material (with a structure as in example 1), which comprises the steps of firstly preparing sulfhydrylated polyethylene wax, then uniformly mixing sulfhydrylated modified polyethylene wax and nano silver antibacterial agent, fully complexing sulfhydryl groups and nano silver to realize the full dispersion and tight combination of the nano silver antibacterial agent in the functionalized (i.e. sulfhydrylated) polyethylene wax, then adding SEBS resin, fully stirring and mixing, and then carrying out shaping treatment to obtain the polyethylene wax/SEBS-based nano silver antibacterial material, wherein the antibacterial material is in particular granular form, namely the antibacterial material is antibacterial master batch.
The compatibility and the bonding strength of the styrene-butadiene block copolymer (SEBS) with a polystyrene resin matrix are effectively improved through the introduction of the compatibilizer-hydrogenated styrene-butadiene block copolymer (SEBS).
As a preferred embodiment, the nano-silver antibacterial agent is nano-silver particles. In the invention, the nano silver particles comprise nano silver simple substance particles and/or nano silver particles loaded by a carrier.
Further, the nano silver particles supported by the carrier comprise Ag-CuO, ag-ZnO, ag-TiO and Ag-Al 2 O 3 At least one of them.
As a preferred embodiment, the polyethylene wax used has a number average molecular weight of 6000 to 15000.
In a preferred embodiment, in preparing the sulfhydrylated polyethylene wax, the polyethylene wax is subjected to epoxidation modification, and then the mercaptoethylamine is added into the polyethylene wax subjected to epoxidation modification to obtain the sulfhydrylated polyethylene wax.
Further, in the polyethylene wax base nano silver antibacterial material, the molar ratio of mercapto group to epoxy group in the mercapto polyethylene wax is 0.2-0.73.
As a preferred embodiment, the polyethylene wax base nano silver antibacterial material is prepared from the following raw materials: sulfhydrylated polyethylene wax, an antioxidant and a nano silver antibacterial agent.
Further, antioxidants include antioxidant 1010 and/or antioxidant 168.
As a preferred embodiment, the SEBS resin requires a viscosity (25 ℃) in toluene solution (10 wt%) of less than 1500mpa.s. The higher the viscosity, the higher the molecular weight of the SEBS, and in the invention, the molecular weight of the SEBS resin needs to be controlled within the specific range so as not to influence the melt viscosity of the antibacterial material and adversely affect the surface enrichment effect of the antibacterial material.
The preparation method of the polyethylene wax/SEBS-based nano silver antibacterial material has the following beneficial effects:
1. the stable dispersion of the nano silver antibacterial agent in the polyethylene wax is realized through the strong interaction (complexation) between the mercapto group in the mercapto polyethylene wax and the nano silver antibacterial agent, the purposes of reducing agglomeration and improving the dispersibility are achieved, and the uniform and stable dispersion of the nano silver antibacterial agent in the material can be realized.
2. The prepared polyethylene wax/SEBS-based nano silver antibacterial material reduces the dosage of the nano silver antibacterial agent under the condition of not reducing the antibacterial effect, and can reduce the dosage by 10-23% under the general condition.
3. The prepared material not only has antibacterial effect, but also can partially adjust the melt fluidity of polystyrene resin and improve the processing fluidity of polystyrene and composite materials thereof by adopting low-viscosity resin (SEBS) as a base material.
Example 3
The invention relates to a preparation method of a polyethylene wax/SEBS-based nano silver antibacterial material, which comprises the following steps:
(1) And (3) epoxidation modification: fully melting polyethylene wax in a reaction kettle, controlling the temperature to be 120-180 ℃, then adding an initiator (0.2-0.8 wt%) to react with glycidyl methacrylate (1-15 wt%) and improving the efficiency of free radical coupling reaction by adding the initiator to realize the epoxidation modification of the polyethylene wax;
(2) Thiol modification: adding mercaptoethylamine (2-10wt%) into the epoxy modified polyethylene wax melt for continuous reaction to realize mercapto modification of the polyethylene wax;
(3) Transferring the mercapto-modified polyethylene wax melt in the step (2) into a planetary stirrer, adding a nano silver antibacterial agent (the silver content is 10-30wt%) and mixing at a high speed to realize uniform and stable dispersion of the nano silver antibacterial agent in the functionalized (i.e. mercapto) polyethylene wax and obtain a material melt;
(4) And (3) adding SEBS resin into the material melt in the step (3), fully stirring and mixing, and cooling and granulating in the discharging process to obtain the polyethylene wax-nano silver-SEBS antibacterial material.
The invention relates to a preparation method of a polyethylene wax/SEBS-based nano silver antibacterial material, which comprises the following specific reaction routes:
as a preferred embodiment, the epoxidation is modified for 2h-4h and the mercapto modification is modified for 10h-16h.
As a preferred embodiment, the above sulfhydrylated polyethylene wax is added into a stirrer, heated to a molten state, mixed with the nano silver antibacterial agent, and mixed for 0.5-2 hours under the condition of high-speed stirring (3000 rpm).
As a preferred embodiment, the initiator in step (1) is a radical initiator mainly comprising one or more (two or more) of benzoyl peroxide, lauroyl peroxide, di-t-butyl peroxide, dicumyl peroxide, azobisisobutyronitrile, azobisisoheptonitrile and dimethyl azobisisobutyrate.
Example 4
The invention relates to a preparation method of a polyethylene wax/SEBS-based nano silver antibacterial material, which specifically comprises the following steps:
10kg of polyethylene wax is added into a 20L reaction kettle, the temperature is controlled at 160 ℃, after the polyethylene wax is fully melted, 1.2kg of Glycidyl Methacrylate (GMA) and 0.5wt% of initiator (di-tert-butyl peroxide) are added, and the reaction is carried out for 2 hours under the protection of nitrogen, so that the grafting rate reaches 2.3% (mol ratio). Then, 0.7kg of mercaptoethylamine was added to the reaction system, and the reaction was continued for 12 hours to prepare a mercapto polyethylene wax in which the molar ratio of mercapto groups to epoxy groups was 0.53. The obtained reaction product was repeatedly washed with ethanol and purified.
Then adding the sulfhydrylation polyethylene wax into a planetary stirring reactor, heating to a molten state (80-180 ℃), adding 2.3kg of nano silver particles, mixing and stirring at a high speed for 0.5-2h, and then adding 1wt% of antioxidant (antioxidant 1010 and antioxidant 168).
2kg of SEBS resin is further added, after the SEBS resin is completely melted, the mixture is stirred and mixed at high speed, and the mixture is discharged when the mixture is hot, cooled and granulated to prepare the granular polyethylene wax/SEBS-based nano silver antibacterial material. The silver content in the polyethylene wax/SEBS-based nano silver antibacterial material reaches 11.72wt%.
Example 5
The invention relates to a preparation method for preparing an antibacterial polyethylene product by using a polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano silver antibacterial material and polystyrene, which comprises the following steps: the polyethylene wax/SEBS-based nano silver antibacterial material of the embodiment 1, 2, 3 or 4 is used for carrying out melt blending with polystyrene resin, granulating and then carrying out injection molding.
The invention can also be directly injection molded after fully mixing polyethylene wax/SEBS-based nano silver antibacterial material with polystyrene resin particles.
As a preferred embodiment, the polystyrene resin includes at least one of HIPS, ABS, SBS, SEBS, SEPS and PS.
The polyethylene wax/SEBS-based nano silver antibacterial material provided by the invention is applicable to polystyrene matrix resins such as HIPS, ABS, SBS, SEBS, SEPS, PS and the like, and is also applicable to various composite materials prepared from the polystyrene resins.
As a preferred embodiment, the polystyrene resin has a melt index of 1 to 12g/min.
As a preferred implementation mode, the temperature of injection molding is 160-220 ℃, the injection molding pressure is regulated according to the product property and the runner design, and high-speed injection molding is suggested to be adopted, so that the enrichment effect of the antibacterial material on the surface of the polystyrene injection molded product is facilitated.
Example 6
In the embodiment, the antibacterial material prepared in the embodiment 4 is used as an additive to realize the effect of improving the antibacterial performance of HIPS products.
The invention relates to a preparation method of a HIPS product by using a polyethylene wax/SEBS-based nano silver antibacterial material and high impact polystyrene resin (HIPS), which comprises the following steps:
(1) 10kg of high impact polystyrene resin (melt index is 6 g/min), 0.3kg of polyethylene wax/SEBS-based nano silver antibacterial material are added, melt blending is carried out on a double screw extruder, cooling granulation is carried out, and full drying is carried out.
(2) And (3) after the particles are melted and blended, aging for 24 hours, directly performing injection molding, wherein the injection molding temperature is 210 ℃, and obtaining the antibacterial HIPS product.
The basic mechanical properties of the antimicrobial HIPS product of this example are shown in table 1,
TABLE 1 mechanical Properties of antibacterial HIPS products
The basic antimicrobial properties of the antimicrobial HIPS articles of this example are shown in table 2:
TABLE 2 antibacterial Properties of antibacterial HIPS products
Furthermore, characterization of the surface enrichment properties of the nano silver particles:
the surface enrichment characteristic of the nano silver antibacterial agent is expressed by comparing the silver content of the surface layer with the silver content of the overall product, and the silver content is measured by atomic absorption spectroscopy.
Silver content in 0.2mm surface layer/silver content of the product overall = 3.15.
The silver content was measured by atomic absorption spectroscopy, and an average value of 5 samples was taken.
Therefore, the nano silver is enriched on the surface of the product in a large amount, and good antibacterial and bacteriostatic effects can be achieved.
To further compare the effect of melt viscosity of matrix HIPS on surface mobility of antibacterial materials, various antibacterial HIPS were prepared using the method described above, the specific properties of which are shown in table 3:
TABLE 3 influence of matrix melt viscosity on surface enrichment Properties of antibacterial materials
As can be seen from table 3 above, there is a use of a nano silver antimicrobial masterbatch with a low melt viscosity that achieves selective enrichment to the surface of the product part during the injection molding process. The higher the melt viscosity (lower the melt index) of the HIPS base resin, the more pronounced the surface enrichment phenomenon. Therefore, the surface antibacterial property of the product can be effectively improved through the surface enrichment effect of the nano silver particles. Compared with the process of directly adding the nano silver particles, the antibacterial effect of the antibacterial material adopted by the system is obviously better than that of directly adding the nano silver particles.
Example 7
In the embodiment, the antibacterial material prepared in the embodiment 4 is used as an additive to realize the effect of improving the antibacterial performance of the ABS product.
The invention relates to a preparation method for preparing an acrylonitrile-butadiene-styrene (ABS) product by using a polyethylene wax/SEBS-based nano silver antibacterial material and an ABS copolymer, which comprises the following steps:
(1) 10kg of high-density polyethylene (melt index 2.1 g/min), 0.3kg of polyethylene wax/SEBS-based nano-silver antibacterial material were added and mixed in a high-speed mixer for 10min.
(2) And (3) directly injection molding the blended particles at the injection temperature of 210 ℃ to obtain the antibacterial ABS product.
The basic mechanical properties of the antimicrobial ABS articles of this example are shown in table 4,
TABLE 4 mechanical Properties of antibacterial ABS products
The basic antimicrobial properties of the antimicrobial ABS articles of this example are shown in table 5,
TABLE 5 antibacterial Properties of antibacterial ABS products
Furthermore, characterization of the surface enrichment properties of the nano silver particles:
the surface enrichment characteristic of the nano silver antibacterial agent is expressed by comparing the silver content of the surface layer with the silver content of the overall product, and the silver content is measured by atomic absorption spectroscopy.
Silver content in 0.2mm surface layer/silver content of the product overall = 2.89%.
The silver content was measured by atomic absorption spectroscopy, and an average value of 5 samples was taken.
To further compare the effect of melt viscosity of the matrix ABS on surface mobility of antibacterial materials, various antibacterial ABS prepared using the above method, specific properties are shown in table 6:
TABLE 6 influence of the melt viscosity of the matrix on the surface enrichment properties of antibacterial materials
It can be seen that the use of nanosilver antimicrobial masterbatches with low melt viscosity allows for selective enrichment of the product surface during the injection process. The higher the melt viscosity (lower the melt index) of the ABS base resin, the more pronounced the surface enrichment phenomenon thereof. Therefore, the surface antibacterial property of the product can be effectively improved through the surface enrichment effect of the nano silver particles. When ABS with a lower melt index is used as the matrix resin, the greater the difference in melt viscosity between the antibacterial material and the matrix resin, the better the surface enrichment property. Compared with the process of directly adding the nano silver particles with the same quality, the antibacterial effect of the antibacterial material adopted by the system is obviously better than that of directly adding the nano silver particles.
The above embodiments are not intended to limit the method and application of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be regarded as not departing from the scope of the invention.

Claims (6)

1. A preparation method of a polyethylene wax/SEBS-based nano silver antibacterial material is characterized by comprising the following steps: firstly preparing sulfhydrylation polyethylene wax, wherein the number average molecular weight of the polyethylene wax is 6000-15000, in the preparation of the sulfhydrylation polyethylene wax, firstly, performing epoxidation modification on the polyethylene wax, and then adding sulfhydryl ethylamine into the polyethylene wax subjected to epoxidation modification to obtain the sulfhydrylation polyethylene wax;
uniformly mixing the sulfhydrylation modified polyethylene wax and the nano silver antibacterial agent, and adding a compatilizer which is SEBS resin to obtain the polyethylene wax/SEBS-based nano silver antibacterial material;
the reaction equation of the preparation process of the polyethylene wax/SEBS-based nano-silver antibacterial material is as follows:
the polyethylene wax/SEBS-based nano silver antibacterial material is used for injection molding of polystyrene products, and is melt blended with polystyrene resin and then injection molded.
2. The method for preparing the polyethylene wax/SEBS-based nano-silver antibacterial material according to claim 1, which is characterized in that: the nano silver antibacterial agent is nano silver particles, and comprises nano silver simple substance particles and/or nano silver particles loaded by a carrier.
3. The method for preparing the polyethylene wax/SEBS-based nano-silver antibacterial material according to claim 2, which is characterized in that: the nano silver particles comprise nano silver particles loaded by a carrier, and the nano silver particles loaded by the carrier comprise Ag-CuO, ag-ZnO, ag-TiO and Ag-Al 2 O 3 At least one of them.
4. The method for preparing the polyethylene wax/SEBS-based nano-silver antibacterial material according to claim 1, which is characterized in that: the molar ratio of mercapto groups to epoxy groups in the mercapto polyethylene wax is 0.2-0.73.
5. The method for preparing the polyethylene wax/SEBS-based nano-silver antibacterial material according to claim 1, which is characterized in that: in the polyethylene wax/SEBS-based nano silver antibacterial material, the silver content is 10-35 wt%.
6. The method for preparing the polyethylene wax/SEBS-based nano-silver antibacterial material according to claim 1, which is characterized in that: the SEBS resin has a viscosity of less than 1500mpa.s in a 10 wt.% toluene solution at 25 ℃.
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