CN110066489B

CN110066489B - Nano plastic master batch and preparation method thereof

Info

Publication number: CN110066489B
Application number: CN201910326501.1A
Authority: CN
Inventors: 李卫; 覃碧勋
Original assignee: Puca Plastic Technology Co ltd
Current assignee: Puca Plastic Technology Co ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2022-01-11
Anticipated expiration: 2039-04-19
Also published as: CN110066489A

Abstract

The application provides a nano plastic master batch and a preparation method thereof, wherein the nano plastic master batch comprises, by weight, 10-50% of a thermoplastic rubber carrier, 5-30% of a thermoplastic plastic carrier, 1-10% of nano particles, 20-50% of a dispersion medium, 0.1-2% of a first auxiliary agent and 0-1% of a second auxiliary agent, the dispersion medium is rubber oil, and the first auxiliary agent is a coupling agent. The rubber oil can be completely absorbed by the thermoplastic rubber carrier and enter the molecular chain of the thermoplastic rubber carrier, and the nano particles can be dispersed in the rubber oil through the connection effect of the coupling agent and dispersed in the thermoplastic rubber carrier along with the rubber oil and maintained in a fully dispersed state. The rubber oil is one part of the nano plastic master batch, does not relate to the separation of a solvent, and does not have the phenomena that nano particles return to be coarse and collide with each other to be condensed and agglomerated. Meanwhile, the nano particles are dispersed in a thermoplastic rubber carrier along with rubber oil to form a core-shell structure of soft rubber embedded hard nano particles, and the core-shell structure can improve the toughness of the nano plastic master batch.

Description

Nano plastic master batch and preparation method thereof

Technical Field

The application relates to the field of plastic processing, in particular to a nano plastic master batch and a preparation method thereof.

Background

The nano plastic refers to an organic/inorganic nanocomposite material in which an inorganic filler is dispersed in an organic polymer matrix in a nano size. In the nanocomposite, the size of the dispersed phase is less than 100nm in at least one dimension. Due to the nanometer size effect of dispersibility, large specific surface area and strong interface combination, the nanometer composite material has excellent performance which is not possessed by common engineering plastics, for example, due to the small size of the nanometer particles, the nanometer plastic shows the characteristics of good light transmission, barrier property, heat resistance, heat conductivity, electric conductivity, sterilization and mildew resistance, ultraviolet resistance and the like.

Generally, the preparation method of the nano plastic comprises the following steps:

(1) an intercalation method: a method of using a layered inorganic material (e.g., mica, clay, graphite, layered metal oxide, etc.) as an inorganic phase, and inserting an organic phase monomer into the interlayer of the inorganic phase to perform in-situ polymerization, or inserting a polymer directly into the interlayer to form a composite material.

(2) Sol-gel method: the preparation process includes dissolving precursor of alkoxy metal compound or metal salt, etc. (water soluble salt or oil soluble alkoxide) in water or organic solvent to form homogeneous solution, hydrolyzing solute to produce nanometer level particle and form sol, condensation polymerizing with polymer to form gel with three-dimensional network structure, and drying to eliminate low molecular matter to prepare nanometer composite material.

(3) The blending method comprises the following steps: the blending method can be divided into a solution blending method, an emulsion blending method, a melt blending method and a mechanical blending method. The blending method is the most widely applied method in the method for preparing the polymer/inorganic nano particle composite material, is also the simplest method for preparing the nano composite material, is suitable for nano particles with various forms, and has the key technology of controlling the nano particles to be uniformly dispersed in a polymer matrix in a nano size.

Chinese patent application No. CN201210079511.8 discloses a method for preparing nano-sized master batches, which mainly uses a mechanical method to disperse nano-particles, and has a certain limitation on realizing nano-sized dispersion of nano-particles, and the nano-sized master batches are not uniformly dispersed, which may affect the performance of the nano-sized master batches.

Because the nano particles have large specific surface area, the nano particles are easy to agglomerate and agglomerate, and the nano effect is not generated when the nano particles are directly used, and the agglomeration is required to be firstly opened in a solvent (or liquid). In chinese patent nos. 201410383795.9 and 201510618125.5, a nano predispersion is first prepared in deionized water or ethanol, and then the water or ethanol solvent of the non-masterbatch component is removed to prevent the formation of particles. Generally, after the nano particles are dispersed in a solvent and distributed in the middle of water or ethanol, a water (ethanol) layer hinders mutual collision of the nano particles, a larger space is provided for accommodating the particles, after the water (ethanol) is filtered, evaporated and removed, the nano particles do not have a barrier layer and collide with each other to agglomerate together, so that a coarse returning phenomenon is generated, the nano particles collide with each other to agglomerate and agglomerate again, namely, the nano particles return to a state before dispersion, so that the dispersion effect of the nano particles is influenced. Although some surface treatment agents are added to water (ethanol) to prevent agglomeration, a small amount of surface treatment agent cannot prevent re-agglomeration of nanoparticles due to the large specific surface area of the nanoparticles.

Therefore, there is a need for a new nano plastic master batch and a preparation method thereof, which can uniformly and fully disperse nano particles in a polymer carrier, thereby improving the ultraviolet resistance, antibacterial property and toughness of the nano plastic master batch.

Content of application

The application aims to provide a nano plastic master batch and a preparation method thereof, which can effectively solve the problem of poor dispersion of nano particles in a polymer carrier.

In order to achieve the above purpose, the first aspect of the present application provides a nano plastic master batch, which comprises, by weight, 10 to 50% of a thermoplastic rubber carrier, 5 to 30% of a thermoplastic plastic carrier, 1 to 10% of nanoparticles, 20 to 50% of a dispersion medium, 0.1 to 2% of a first auxiliary agent and 0 to 1% of a second auxiliary agent, wherein the dispersion medium is rubber oil, and the first auxiliary agent is a coupling agent.

The rubber oil in the nano plastic master batch can play the roles of reducing the hardness of a thermoplastic rubber carrier and improving the melt flowability, so that the rubber oil can be completely absorbed by the thermoplastic rubber carrier and enters a molecular chain of the thermoplastic rubber carrier, and nanoparticles can be dispersed in the rubber oil through the connection effect of a coupling agent, so that the nanoparticles are dispersed in the thermoplastic rubber carrier with reduced hardness and enhanced flowability together with the rubber oil and maintain the fully dispersed state, and the thermoplastic rubber carrier, the thermoplastic plastic carrier and the rubber oil jointly form a thermoplastic elastomer (TPE for short) system. And because the dispersion medium is rubber oil which is a part of the nano plastic master batch, the separation of a solvent is not involved, and the phenomena of re-coarsening, re-agglomeration and reunion caused by mutual collision of nano particles can be avoided. The nano particles in the nano plastic master batch have good dispersibility in the carrier, and do not reunite, so that the good dispersibility of the nano plastic master batch ensures that the nano plastic master batch has good ultraviolet resistance and antibacterial property. Meanwhile, the nano particles are dispersed in the thermoplastic rubber carrier with reduced hardness and enhanced fluidity along with the rubber oil to form a core-shell structure of the soft rubber embedded hard nano particles, the core-shell structure can improve the toughness of the nano plastic master batch, wherein the high-content thermoplastic rubber carrier not only plays a role in toughening, but also plays a role in absorbing the dispersed nano particles of the rubber oil, and the toughness improved by the core-shell structure of the formed soft rubber embedded hard nano particles is more obvious than the toughness effect generated by adding a pure toughening agent into the plastic master batch. The nano particles of the nano plastic master batch have good dispersibility in the carrier, and the nano plastic master batch has good toughness, so the application field is wider.

The second aspect of the present application provides a method for preparing a nano plastic masterbatch, comprising:

(1) preparation of nanoparticle predispersion

Premixing the dispersion medium, the first auxiliary agent and the nano particles, and then dispersing;

(2) mixing and granulating

And adding the nano particle pre-dispersion liquid into the thermoplastic rubber carrier under a stirring state, mixing, adding the thermoplastic plastic carrier and the second auxiliary agent, mixing at a high speed to obtain a mixture, and performing melt extrusion granulation by a double-screw extruder.

The nano plastic master batch is prepared by fully dispersing nano particles in rubber oil by virtue of the connection effect and the external dispersing force of a coupling agent to form a nano particle pre-dispersion liquid; and then mixing with a thermoplastic rubber carrier, absorbing rubber oil by the thermoplastic rubber carrier to enter a molecular chain of the thermoplastic rubber carrier, dispersing the nano particles in the thermoplastic rubber carrier with reduced hardness and enhanced fluidity along with the rubber oil to form a core-shell structure of soft rubber embedded hard nano particles, mixing with the plastic carrier and a second auxiliary agent to form a thermoplastic elastomer (TPE for short) system, and performing melt granulation to obtain the nano plastic master batch. The preparation method does not involve the removal of the solvent, so that the phenomenon that the nano particles are re-thickened and collide with each other to be re-condensed and agglomerated can be avoided.

Detailed Description

The technical solutions of the present application are further described below by the specific embodiments, but the present application is not limited thereto.

According to a first aspect of the application, the nano plastic master batch is prepared from, by weight, 10-50% of a thermoplastic rubber carrier, 5-30% of a thermoplastic plastic carrier, 1-10% of nano particles, 20-50% of a dispersion medium, 0.1-2% of a first auxiliary agent and 0-1% of a second auxiliary agent, wherein the dispersion medium is rubber oil, and the first auxiliary agent is a coupling agent. The weight percentage of the thermoplastic rubber carrier may be, but is not limited to, 10%, 20%, 30%, 40%, 50%, the thermoplastic carrier may be, but is not limited to, 5%, 10%, 15%, 20%, 25%, 30%, the nanoparticle may be, but is not limited to, 1%, 2%, 5%, 8%, 10%, the dispersion medium may be, but is not limited to, 20%, 25%, 30%, 35%, 40%, 45%, 50%, the first aid may be, but is not limited to, 0.1%, 0.5%, 0.8%, 1.0%, 1.5%, 1.8%, 2%, the second aid may be, but is not limited to, 0, 0.1%, 0.3%, 0.5%, 0.7%, 1%. 10-50% of thermoplastic rubber carrier can absorb 20-50% of rubber oil, 1-10% of nano particles can be well dispersed in 10-50% of thermoplastic rubber carrier. The thermoplastic rubber carrier, the thermoplastic plastic carrier and the rubber oil need to jointly form a thermoplastic elastomer (TPE) system, so that the content of the thermoplastic plastic carrier is not too low compared with that of the thermoplastic rubber carrier.

Further, the rubber oil is one or more of naphthenic oil, paraffin oil and aromatic oil. The rubber oil can form a thermoplastic rubber carrier and a component of the plastic master batch, so the rubber oil can be present in the plastic master batch and does not need to be subjected to suction filtration and evaporation removal in the preparation process of the nano plastic master batch.

Further, the thermoplastic rubber carrier is hydrogenated styrene-butadiene-styrene block copolymer (SEBS) and/or styrene-butadiene-styrene block copolymer (SBS). SEBS and SBS can absorb oil with more than one time of self mass, which not only can absorb rubber oil, but also can play a toughening role.

Further, the thermoplastic plastic carrier is one or more of polyethylene, polypropylene, ethylene-propylene copolymer and ethylene-octene copolymer. The nano particles are one or more of nano zinc oxide, nano titanium dioxide, nano zinc sulfide, nano silicon dioxide and graphene. The first auxiliary agent is one or more of titanate coupling agent, silane coupling agent, aluminate coupling agent and aluminum-titanium composite coupling agent.

Further, the second auxiliary agent comprises 0.1-0.5% of lubricant and 0.1-0.3% of antioxidant. The lubricant can be, but is not limited to, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, and the lubricant is one or more of stearic acid, a salt of polyethylene, a polypropylene wax, and a polyamide wax, and the salt of stearic acid can be, in particular, zinc stearate, calcium stearate, magnesium stearate, aluminum stearate, barium stearate, and the lubricant facilitates high speed mixing in a high speed mixer. The antioxidant may be, but is not limited to, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, and the antioxidant is one or more of pentaerythritol beta [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ] propionate, octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris (2, 4-di-tert-butylphenyl) phosphite, and pentaerythritol tetrakis [ methyl-beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]. The antioxidant can prevent the thermoplastic rubber carrier and the thermoplastic rubber carrier from oxidative degradation in the melt extrusion process of the double-screw extruder.

(1) preparation of nanoparticle predispersion

(2) mixing and granulating

And adding the nanoparticle pre-dispersion liquid into a thermoplastic rubber carrier under a stirring state, mixing, adding a thermoplastic plastic carrier and the second auxiliary agent, mixing at a high speed to obtain a mixture, and performing melt extrusion granulation by a double-screw extruder.

In the step (1), the dispersion medium, the first auxiliary agent and the nanoparticles can be premixed in a container, and then dispersed at a high speed in a dispersion device, wherein the dispersion device can be an ultrasonic dispersion instrument, a sand mill or a three-roll mill, and the dispersion time can be 5-20 min.

In the step (2), the components can be mixed in a high-speed mixer, specifically, the operation in the step (2) can be that a thermoplastic rubber carrier is firstly put into the high-speed mixer, the machine is started, the nano particle pre-dispersion liquid is injected while stirring, then the high-speed mixing is carried out for 5-10 min, then a thermoplastic plastic carrier and a second auxiliary agent are put into the high-speed mixer, the high-speed mixing is carried out for 3-5 min, the discharging is carried out, a mixed material is obtained, and the mixed material is extruded by a double screw to be melted, extruded and granulated.

The technical solutions of the present application will be further described below by way of specific examples, and the raw materials according to the examples of the present application can be commercially available.

Example 1

The nanometer plastic master batch is prepared from raw materials of 30 percent of SEBS, 20 percent of polypropylene, 8.5 percent of nanometer titanium dioxide, 40 percent of naphthenic oil and 1.5 percent of silane coupling agent KH-550 by weight.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

Firstly, premixing naphthenic oil, a silane coupling agent KH-550 and nano titanium dioxide in a container, and then, carrying out high-speed dispersion in an ultrasonic dispersion instrument for 15 min;

(2) mixing and granulating

The method comprises the following steps of firstly putting SEBS into a high-speed mixer, starting the mixer, injecting a nano particle pre-dispersion liquid while stirring, then mixing at a high speed for 10min, then putting polypropylene, then mixing at a high speed for 5min, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Example 2

The nanometer plastic master batch is prepared from 50% of SEBS, 25% of polypropylene, 3% of nanometer titanium dioxide, 20% of naphthenic oil and 2% of silane coupling agent KH-550 by weight.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

(2) mixing and granulating

Example 3

The nano plastic master batch is prepared from 20% of SEBS, 10% of polypropylene, 10% of ethylene-propylene copolymer, 5% of nano titanium dioxide, 4.5% of nano silicon dioxide, 50% of naphthenic oil and 0.5% of titanate coupling agent by weight.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

Firstly, premixing naphthenic oil, a titanate coupling agent, nano titanium dioxide and nano silicon dioxide in a container, and then dispersing in an ultrasonic dispersion instrument at a high speed for 10 min;

(2) mixing and granulating

Putting the SEBS into a high-speed mixer, starting the mixer, injecting the nano particle pre-dispersion liquid while stirring, then mixing at a high speed for 5min, then putting the polypropylene and the ethylene-propylene copolymer, mixing at a high speed for 5min, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Example 4

The nanometer plastic master batch is prepared from the following raw materials, by weight, 30% of SBS, 20% of polypropylene, 8.5% of nanometer titanium dioxide, 40% of naphthenic oil and 1.5% of silane coupling agent KH-550.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

(2) mixing and granulating

Putting SBS into high speed mixer, starting machine, injecting nano particle predispersion liquid while stirring, then mixing for 10min at high speed, then putting polypropylene, mixing for 5min at high speed, discharging to obtain mixture, and extruding, melting and extruding the mixture by twin screw to granulate.

Example 5

The nanometer plastic master batch is prepared from the following raw materials, by weight, 30% of SEBS, 20% of polypropylene, 8.5% of nanometer zinc oxide, 40% of paraffin oil and 1.5% of a silane coupling agent KH-550.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

Firstly, premixing paraffin oil, a silane coupling agent KH-550 and nano zinc oxide in a container, and then dispersing at high speed in an ultrasonic dispersion instrument for 15 min;

(2) mixing and granulating

Example 6

The nanometer plastic master batch is prepared from the following raw materials, by weight, 30% of SEBS, 20% of polypropylene, 2.5% of nanometer titanium dioxide, 6% of nanometer zinc oxide, 40% of naphthenic oil, 1.2% of an aluminate coupling agent and 0.3% of polyethylene wax.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

Firstly, premixing naphthenic oil, an aluminate coupling agent, nano titanium dioxide and nano zinc oxide in a container, and then dispersing at high speed in an ultrasonic dispersion instrument for 15 min;

(2) mixing and granulating

The method comprises the following steps of firstly putting SEBS into a high-speed mixer, starting the mixer, injecting a nano particle pre-dispersion liquid while stirring, then mixing at a high speed for 10min, then putting polypropylene and polyethylene wax, mixing at a high speed for 5min, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Example 7

The nanometer plastic master batch is prepared from the following raw materials, by weight, 30% of SEBS, 20% of polypropylene, 8.5% of nanometer titanium dioxide, 40% of naphthenic oil, 1.2% of a silane coupling agent KH-550 and 0.3% of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

(2) mixing and granulating

Putting the SEBS into a high-speed mixer, starting the mixer, injecting the nanoparticle pre-dispersion liquid while stirring, then mixing at high speed for 10min, then putting the polypropylene and the beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester, mixing at high speed for 5min, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Example 8

The nanometer plastic master batch is prepared from the following raw materials, by weight, 30% of SEBS, 20% of polypropylene, 8.5% of nanometer titanium dioxide, 40% of naphthenic oil, 1% of a silane coupling agent KH-550, 0.3% of polyethylene wax and 0.2% of beta [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ] pentaerythritol propionate.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

(2) mixing and granulating

Putting the SEBS into a high-speed mixer, starting the mixer, injecting the nanoparticle pre-dispersion liquid while stirring, then mixing at high speed for 10min, then putting the polypropylene, the polyethylene wax and the beta [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ] pentaerythritol propionate, mixing at high speed for 5min, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Comparative example 1

The nano plastic master batch is prepared from 85% of polypropylene, 10% of nano titanium dioxide and 5% of polyethylene wax by weight.

The preparation method comprises the following steps:

and (3) putting the polypropylene, the nano titanium dioxide and the polyethylene wax into a high-speed mixer, mixing for 15min at a high speed, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Comparative example 2

The nanometer plastic master batch is prepared from 80% of polypropylene, 10% of nanometer titanium dioxide, 5% of polyethylene wax and 5% of SEBS by weight.

The preparation method comprises the following steps:

and (2) putting the polypropylene, the nano titanium dioxide, the polyethylene wax and the SEBS into a high-speed mixer, mixing for 15min at a high speed, discharging to obtain a mixture, and extruding, melting, extruding and granulating the mixture by a double screw.

Comparative example 3

The nanometer plastic master batch is prepared from the raw materials of 30% of SEBS, 20% of polypropylene, 10% of nanometer titanium dioxide and 40% of naphthenic oil in percentage by weight.

The preparation method comprises the following steps:

(1) preparation of nanoparticle predispersion

Firstly, premixing naphthenic oil and nano titanium dioxide in a container, and then dispersing at high speed in an ultrasonic dispersion instrument for 15 min;

(2) mixing and granulating

The nano plastic master batches of examples 1 to 8 and comparative examples 1 to 3 and polypropylene were mixed in a weight ratio of 1:4, and after mixing, the mixture was molded into a plastic sample by an injection molding machine, and then the plastic sample was subjected to an ultraviolet resistance test, an antibacterial test and a toughness test, and the cross section of the plastic sample was observed and compared by a Scanning Electron Microscope (SEM), and the results are shown in table 1.

Wherein, the ultraviolet resistance test adopts GB/T16422.3-2014/ISO 4892-3:2006 Plastic laboratory light source exposure test method part 3: detecting artificial weathering (method A) in a fluorescent ultraviolet lamp, and judging the color and the appearance change of the surface of each sample after exposure, wherein if the color and the appearance do not change, the color and the appearance are evaluated to be excellent; if the color and/or the appearance slightly change, the color and/or the appearance are evaluated as normal; the discoloration was severe and/or peeling and cracking occurred on the surface, and the evaluation was poor. The antibacterial test adopts QB/T2591 and 2003 antibacterial plastic-antibacterial performance test method and antibacterial effect to test the antibacterial rate. The toughness test adopts the standard GB/T1843-2008 plastic cantilever beam impact strength to measure the notch impact strength.

As can be seen from Table 1, compared with comparative examples 1 to 3, the plastic sample sheets prepared from the nano plastic master batches of examples 1 to 8 have better ultraviolet resistance and higher antibacterial rate, which indicates that the nano particles have better dispersibility in the nano plastic master batches, and the SEM morphology analysis also confirms the point. And the plastic sample wafer prepared from the nano plastic master batch of the embodiments 1-8 has good notch impact strength and good toughness. The nano particles in the comparative example 1 are difficult to disperse in polypropylene, are easy to agglomerate and agglomerate, and have no nano effect when being directly used, so that the ultraviolet resistance degree is poor, and the antibacterial rate is low. Comparative example 2 although the toughness of the plastic sample sheet can be slightly improved by adding 5% of SEBS in comparative example 1, the problem of agglomeration of the nanoparticles cannot be solved, and thus the ultraviolet resistance and the antibacterial rate are not much different from those of comparative example 1. In comparative example 3, naphthenic oil was added based on SEBS, and although the naphthenic oil softens the SEBS, it is difficult for the nanoparticles to be enriched in the organic rubber oil as the inorganic filler, so the amount of the nanoparticles dispersed in the SEBS together with the naphthenic oil is limited, and the toughness of the plastic sample piece can be improved by adding 30% of the SEBS, but the improvement of the toughness is limited compared to examples 1 to 8 in which the nanoparticles are dispersed in the rubber oil by the coupling action of the coupling agent and dispersed in the thermoplastic rubber carrier together with the rubber oil.

TABLE 1 test results of examples 1 to 8 and comparative examples 1 to 3

The rubber oil in the nano plastic master batch can play roles in reducing the hardness of SEBS or SBS and improving the melt fluidity, so that the rubber oil can be completely absorbed by the SEBS or SBS and enters molecular chains of the SEBS or SBS. The nano particles can be dispersed in the rubber oil through the connection action of the coupling agent, so that the nano particles are dispersed in SEBS or SBS together with the rubber oil and maintain a fully dispersed state, and the thermoplastic rubber carrier, the thermoplastic plastic carrier and the rubber oil jointly form a thermoplastic elastomer (TPE for short). And the dispersion medium is rubber oil which is a part of the nano plastic master batch, so that the separation of a solvent is not involved, and the phenomena of re-coarsening, mutual collision, re-agglomeration and agglomeration of nano particles can be avoided. The nano particles in the nano plastic master batch have good dispersibility in the carrier, and do not reunite, so that the nano plastic master batch has good ultraviolet resistance and antibacterial property due to good dispersibility. Meanwhile, the nano particles are dispersed in SEBS or SBS along with the rubber oil to form a core-shell structure of the soft rubber embedded hard nano particles, and the core-shell structure can improve the toughness of the nano plastic master batch.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the application, and that those skilled in the art will be able to modify the application in such a manner that it falls within the scope of the application defined by the appended claims after reading this application.

Claims

1. The nanometer plastic master batch is characterized by comprising, by weight, 10-50% of a thermoplastic rubber carrier, 5-30% of the thermoplastic plastic carrier, 1-10% of nanoparticles, 20-50% of a dispersion medium, 0.1-2% of a first auxiliary agent and 0-1% of a second auxiliary agent, wherein the dispersion medium is rubber oil, the first auxiliary agent is a coupling agent, and the dispersion medium, the first auxiliary agent and the nanoparticles are prepared into a nanoparticle pre-dispersion liquid before granulation and then form a soft rubber embedded hard nanoparticle core-shell structure with the thermoplastic rubber carrier.

2. The nano-plastic masterbatch according to claim 1, wherein the rubber oil is one or more of naphthenic oil, paraffin oil and aromatic oil.

3. The nanopaste masterbatch of claim 1, wherein the thermoplastic rubber carrier is a hydrogenated styrene-butadiene-styrene block copolymer and/or a styrene-butadiene-styrene block copolymer.

4. The nanoplastic masterbatch of claim 1, wherein the thermoplastic carrier is one or more of polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-octene copolymer.

5. The nano plastic master batch of claim 1, wherein the nano particles are one or more of nano zinc oxide, nano titanium dioxide, nano zinc sulfide, nano silicon dioxide and graphene.

6. The nanoplastic masterbatch of claim 1, wherein the first additive is one or more of a titanate coupling agent, a silane coupling agent, an aluminate coupling agent, and an aluminum-titanium composite coupling agent.

7. The nano plastic master batch of claim 1, wherein the second auxiliary agent comprises 0.1-0.5% of lubricant and 0.1-0.3% of antioxidant.

8. The nanopaste masterbatch of claim 7, wherein said lubricant is one or more of stearic acid, stearate, polyethylene wax, polypropylene wax, and polyamide wax.

9. The nanopaste masterbatch of claim 7, wherein the antioxidant is one or more of pentaerythritol beta [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ] propionate, octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris (2, 4-di-tert-butylphenyl) phosphite, and pentaerythritol tetrakis [ methyl-beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].

10. The method for preparing the nano plastic master batch according to any one of claims 1 to 9, comprising the following steps:

(1) preparation of nanoparticle predispersion

(2) mixing and granulating