CN113789028A

CN113789028A - Thermoplastic elastomer and preparation method thereof, application and regenerated and recycled ABS plastic and preparation method thereof

Info

Publication number: CN113789028A
Application number: CN202111129375.4A
Authority: CN
Inventors: 李祖君; 蓝云燕; 黄燕生; 吴峰
Original assignee: Shenzhen City Xin Chang Long New Materials Research Institute Co ltd
Current assignee: Shenzhen City Xin Chang Long New Materials Research Institute Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-12-14
Anticipated expiration: 2041-09-26
Also published as: CN113789028B

Abstract

The application relates to the field of high polymer materials, in particular to a thermoplastic elastomer, a preparation method thereof, application thereof and a regenerated and recycled ABS plastic, wherein the thermoplastic elastomer is obtained by dry mixing of SBS, SSBR, a compatilizer and an antioxidant, adding rubber oil for stirring, adding silicon dioxide, continuously stirring, extruding and granulating, can be used for preparing the regenerated and recycled ABS plastic, is not easy to precipitate under a high addition amount, and is beneficial to improving the impact strength of the ABS plastic. The ABS plastic is obtained by mixing the thermoplastic elastomer, the ABS reclaimed material and color master batch, and performing injection molding, extrusion and granulation. The thermoplastic elastomer can keep the whole ABS plastic in a uniform state under the condition of higher doping amount, thereby being beneficial to improving the impact strength of the finally obtained recycled ABS plastic.

Description

Thermoplastic elastomer and preparation method thereof, application and regenerated and recycled ABS plastic and preparation method thereof

Technical Field

The application relates to the field of high polymer materials, in particular to a thermoplastic elastomer and a preparation method thereof, and ABS plastic recycled and recycled by application and a preparation method thereof.

Background

ABS plastics are nontoxic and tasteless, have high glossiness, are relatively wear-resistant and have small loss, and the ABS plastics have good dimensional stability after injection molding and are common plastics in life. ABS plastics have wide application in the manufacturing industry of machinery, textile, automobile, electric and the like and chemical industry. However, ABS has the disadvantage of being susceptible to aging under thermal oxygen conditions, and therefore ABS exhibits a certain degree of aging after having been in service, under the influence of its environment of use. The regenerated and recycled ABS plastic can be subjected to the process of crushing, cleaning, drying, extrusion granulation, injection molding and the like in the recycling process, so that the aging process is further accelerated, wherein the impact resistance of the regenerated and recycled ABS is reduced remarkably. Therefore, the recycled ABS plastic can only be used as some low-grade products, so that the recycled ABS plastic needs to be processed and modified.

At present, the auxiliary agents for improving the impact strength of the regenerated and recycled ABS plastic mainly comprise methods such as TPU, SBS, ABS high rubber powder, K resin, MBS, nano rigid particles and the like, wherein SBS is mostly adopted as a toughening agent for modification required for improving the impact strength. The SBS can improve the toughness, the impact strength, the bending resistance and the low temperature resistance of the plastic, and has better compatibility with the ABS.

However, when the amount of SBS added to ABS exceeds 1%, SBS may be precipitated on the surface of ABS, and thus may result in insufficient ability to improve impact strength of recycled ABS plastic using SBS.

Disclosure of Invention

In order to improve the impact strength of the recycled ABS plastic, the application provides a thermoplastic elastomer, a preparation method, application and the recycled ABS plastic.

In a first aspect, the thermoplastic elastomer provided by the present application comprises the following components in parts by mass:

SBS: 20-35 parts;

SSBR: 25-55 parts;

rubber oil: 20-35 parts;

nano silicon dioxide: 5-10 parts;

a compatilizer: 0.5-1.5 parts;

antioxidant: 0.5 to 1.5 portions.

The SSBR has higher elasticity, small extrusion shrinkage, good physical and mechanical properties, high tear strength and abrasion resistance, and can improve the overall viscosity and tear resistance and improve the compatibility of SBS when applied to the regeneration and recovery of ABS plastic after being introduced into the SBS system. The nano silicon dioxide has smaller grain diameter, better quantum size effect, small size effect and surface effect, and can be better combined with SBS and SSBR. SBS and rubber oil have better compatibility, SBS combines with rubber oil to become oil-absorbing SBS, take oil-absorbing SBS as carrier can compound SSBR and right amount of nanometer silicon dioxide of equivalent or more, and added compatilizer to make insoluble substance in the system better compatible, the mutual combination of several kinds of substance has got SBS thermoplastic elastomer better in toughness, the thermoplastic elastomer can be doped in the reclaimed ABS plastic particle with bigger proportion, and the whole body can keep comparatively homogeneous state after doping. The SBS thermoplastic elastomer is added into the recycled ABS plastic particles, so that the impact strength of the recycled ABS plastic can be greatly improved.

Optionally, the SBS is linear SBS, wherein the styrene monomer content in the SBS is 55% -70%, and the vinyl monomer content in the SBS is 30% -45%.

Linear SBS combines well with SSBR. In the linear SBS, the higher content of the styrene monomer is adopted, which is beneficial to improving the overall viscosity of the thermoplastic elastomer, and the addition of the SSBR enables the thermoplastic elastomer to have better compatibility, so the increase of the styrene monomer has no obvious influence on the blending amount of the thermoplastic elastomer, and the effect of better improving the impact strength of the recycled ABS plastic is achieved. Wherein the vinyl monomer is a chain obtained by [1,2] -polymerization of butadiene.

Optionally, the SSBR has a styrene monomer content of 30% to 50% and a vinyl monomer content of 10% to 30%.

The styrene structure enables the SSBR to have certain strength and rigidity, but the SSBR molecule has a steric hindrance ring, so that the SSBR has higher rigidity and possibly poorer mobility, and the SSBR has proper mobility by selecting proper styrene monomer content. The vinyl monomer is a larger side group on the molecular chain of the SSBR, so that the flexibility of the molecular chain is poor, the internal friction loss is increased, the hardness, the rebound resilience, the tearing strength and the like of the SSBR can be reduced due to the overlarge content of the vinyl monomer, and the SSBR can have proper hardness, rebound resilience and tearing strength due to the selection of proper content of the vinyl monomer. When the content of the styrene monomer is higher, the lower content of the vinyl monomer is selected for mutual matching, so that the SSBR has more proper mobility, hardness, resilience and tearing strength, and the toughness of the SBS thermoplastic elastomer is improved. Wherein the vinyl monomer is a chain obtained by [1,2] -polymerization of butadiene.

Optionally, the particle size D50 of the nano-silica is 20-60 nm.

The particle size of the nano silicon dioxide can influence the dispersibility of the nano silicon dioxide in the system to a certain extent, the smaller the particle size is, the larger the specific surface area is, the nano silicon dioxide is likely to agglomerate, and the appropriate particle size is selected to reduce the agglomeration, so that the nano silicon dioxide can be better dispersed in the system and can be better combined with particles of other substances.

Optionally, the purity of the nano-silica is greater than 99.999%, and the content of calcium ions and iron ions in the nano-silica is less than 3 ppm.

The higher the purity of the nano-silica is, the stronger the adhesion effect is, and in order to obtain a better adhesion effect, the nano-silica with higher purity can be selected. And the content of calcium ions and iron ions in the nano silicon dioxide is too high, the nano silicon dioxide can react with other substances to generate precipitates, unnecessary impurities are introduced into the system, and the purity of the nano silicon dioxide can be influenced to a certain extent, so that the modification of SBS is influenced.

Optionally, the compatibilizer is one of maleic anhydride grafted styrene or maleic anhydride grafted butadiene.

During the preparation process, the anhydride group of the maleic anhydride grafted styrene or the maleic anhydride grafted butadiene can perform generalized dehydration reaction with a polar group and form a chemical bond, and incompatible polar and nonpolar substances can be chemically coupled. The maleic anhydride grafted styrene or the maleic anhydride grafted butadiene is added into the system, so that incompatible substances in the system can be better compatible, the particles of the substances in the system are more tightly combined, and the toughness of the SBS thermoplastic elastomer can be improved.

Optionally, the rubber oil is a naphthenic rubber oil.

Compared with other rubber oils, the naphthenic base rubber oil has stronger physical affinity with SBS according to similar compatibility principle, and can be mixed with SBS more fully.

In a second aspect, the present application also provides a process for preparing a thermoplastic elastomer, comprising the steps of:

s1, accurately weighing 20-35 parts of SBS, 25-55 parts of SSBR, 0.5-1.5 parts of compatilizer and 0.5-1.5 parts of antioxidant, and performing dry mixing;

s2, after uniformly mixing, adding 20-35 parts of rubber oil, continuing stirring, and stopping stirring when the particles are in a semitransparent state after oil absorption;

s3, adding 5-10 parts of nano silicon dioxide, continuing stirring, and stopping stirring after the nano silicon dioxide is uniformly dispersed to obtain a mixture 1; and S4, extruding and granulating the mixture 1 to obtain the thermoplastic elastomer.

In the above technical scheme, the SBS, SSBR, the compatibilizer, and the antioxidant are selected and mixed in appropriate weight parts, so that the particles can be sufficiently and uniformly mixed to obtain a relatively stable dispersion system, and if the mixing is not uniform, the place where the mixing is not uniform is likely to be broken, thereby affecting the use effect. Then adding a proper amount of rubber oil into the uniformly mixed mixture to absorb oil, wherein the rubber oil and the nano silicon dioxide can be more fully infiltrated into a system, so that the thermoplastic elastomer with better performance is formed.

Optionally, the thermoplastic elastomer is applied to renewable recycled ABS plastics, and the addition amount is not higher than 3%.

The thermoplastic elastomer is added into a certain amount, so that the toughening effect is not obvious enough, and in consideration of economical and practical properties, the addition amount of the thermoplastic elastomer is not more than 3%, so that a relatively good toughening effect can be obtained, and the thermoplastic elastomer is economical and practical and reduces the cost.

In a third aspect, the application also provides a preparation method of the recycled ABS plastic, which comprises the following steps:

s1, weighing 250 portions and 300 portions of ABS recovered sheet material, and crushing the ABS recovered sheet material into powder with the particle size of 3-10 nm;

s2, adding 3-8 parts of the thermoplastic elastomer and no more than 3 parts of color master batch for dry mixing;

s3, after being uniformly mixed, carrying out injection molding extrusion under the conditions of front-end temperature of 180-;

s4, granulating;

s5, drying and stirring for 15-20min at the temperature of 80-90 ℃ to obtain the regenerated and recycled ABS plastic.

In the technical scheme, a proper amount of the thermoplastic elastomer is added to modify the recycled ABS plastic, under the preparation condition, the impact strength of the recycled ABS plastic can be improved by the proper amount of the thermoplastic elastomer, and the addition amount and the reaction condition of the thermoplastic elastomer both influence the impact strength of the recycled ABS plastic, so that the selection of the proper addition amount and the proper reaction condition of the thermoplastic elastomer is also important.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in the application, the SBS is combined with the SSBR, the rubber oil is added to enable the SBS to become the oil-absorbing SBS, the oil-absorbing SBS is used as a carrier to compound the SSBR with the same amount or more and a proper amount of nano-silica, other auxiliaries are added to modify the nano-silica to obtain the SBS thermoplastic elastomer, and the SBS thermoplastic elastomer is used for modifying the recycled ABS plastic, so that the impact strength of the recycled ABS plastic is greatly improved.

2. The application also provides a preparation method of the thermoplastic elastomer capable of improving the impact strength of the recycled ABS plastic and a preparation method of the recycled ABS plastic, so that the recycled ABS plastic with higher impact strength is obtained.

Detailed Description

The present application will be described in further detail with reference to examples.

In the following examples and comparative examples, the sources and types of some materials are shown in table 1;

TABLE 1 raw material source specification Table

Examples

Examples 1 to 12 and comparative examples 1 to 8, each of which is a thermoplastic elastomer, were prepared as follows:

s1, accurately weighing SBS, SSBR, compatilizer and antioxidant, and performing dry mixing;

s2, after uniformly mixing, adding rubber oil, continuing stirring, and stopping stirring when the particles are in a semitransparent state after oil absorption;

s3, adding nano silicon dioxide, continuing stirring, and stopping stirring after the nano silicon dioxide is uniformly dispersed to obtain a mixture 1;

and S4, carrying out double-screw extrusion and underwater pelletizing on the mixture 1 to obtain the SBS thermoplastic elastomer.

In examples 1 to 3 and comparative examples 1 to 8, SBS was used with a styrene monomer content of 60%, a vinyl monomer content of 40%, SSBR was used with a styrene monomer content of 40%, a vinyl monomer content of 20%, and nano silica particle size was 40 nm. In examples 1 to 3 and comparative examples 1 to 8, the amounts of the raw materials for the thermoplastic elastomers were adjusted as shown in Table 2:

TABLE 2, EXAMPLES 1-3 AND COMPARATIVE EXAMPLES 1-8SBS elastomer raw material quality adjustment

In examples 4-5 and comparative examples 9-10, the styrene monomer and vinyl monomer contents of SBS and SSBR were adjusted on the basis of example 2, as shown in Table 3:

TABLE 3, examples 4-5 and comparative examples 9-10SBS and SSBR styrene and vinyl content adjustment

In examples 9 to 11, the particle size of the nano-silica was adjusted as follows:

example 9

The thermoplastic elastomer was different from example 2 in that the average particle diameter of the nanosilica was 20 nm.

Example 10

The thermoplastic elastomer was different from example 2 in that the average particle diameter of nanosilica was 40 nm.

Example 11

The thermoplastic elastomer was different from example 2 in that the average particle diameter of the nanosilica was 10 nm.

In example 12, the compatibilizer was adjusted as follows:

example 12

The thermoplastic elastomer differs from example 2 in that the compatibilizer is maleic anhydride grafted styrene of equal mass.

Examples 13 to 25 and comparative examples 9 to 16, a recycled ABS plastic and a method for preparing the same:

s1, weighing ABS recovered sheet stock, weighing the ABS recovered sheet stock, crushing and screening, and screening to obtain powder with the particle size of 3-10 nm;

s2, adding the thermoplastic elastomer and the color master batch for dry mixing;

s3, after being uniformly mixed, carrying out injection molding extrusion under the conditions of the front end temperature of 180 ℃, the middle section temperature of 200 ℃ and the tail end temperature of 185 ℃;

s4, granulating;

s5, drying and stirring for 15min at the temperature of 80 ℃ to obtain the regenerated and recycled ABS plastic particles.

In examples 13 to 25 and comparative examples 9 to 16, the mass of the ABS recovered sheet material was 15kg (7.5 kg each of the case material and the flower material of the electric appliance), the mass of the thermoplastic elastomer was 0.15kg, and the mass of the color masterbatch was 0.15 kg. Examples 9 to 27 each corresponded to 0.15kg of the thermoplastic elastomer prepared above, as shown in Table 4.

Table 4, examples 13-25 and comparative examples 9-16 add the corresponding thermoplastic elastomers

Example 25 the preparation of recycled ABS plastic was modified as follows:

example 25

A recycled ABS plastic, different from embodiment 10 in that, the front end temperature is 190 ℃, the middle section temperature is 220 ℃, and the end temperature is 195 ℃ for injection molding extrusion; cutting into granules; drying and stirring for 20min at 90 ℃.

Comparative examples 17-23 differ from example 14 in the quality of the SBS elastomer added and the SBS added in comparative examples 18-20 is SBS Liangrong 1475 as shown in Table 5.

TABLE 5 adjustment of the amounts of SBS elastomer added in comparative examples 12 to 18

Sample(s)	SBS/kg	SBS elastomer/kg	High rubber powder/kg
				Comparative example 17	/	/	/
Comparative example 18	0.15	/	/
				Comparative example 19	0.15	/	0.15
Comparative example 20	0.2	/	0.2
				Comparative example 21	/	Example 140.3kg	/
Comparative example 22	/	Example 140.4kg	/
				Comparative example 23	/	Example 140.5kg	/

Performance detection test method

3kg of each of the modified particles of examples 13 to 25 and comparative examples 9 to 23 was weighed, baked at 95 ℃ for 2 hours, notched impact test pieces were punched out in an injection molding machine (temperature first 200 ℃, second 200 ℃, third 195 ℃, first 75MPa, second 35MPa), the width of the impact test piece was 8mm, the thickness was 4mm, and the impact test pieces were cooled at room temperature for 24 hours and then tested. Notched impact test strips were tested using a cantilever beam impact tester according to GB/T1843.

TABLE 6 data of the Performance test of example 14 and comparative examples 17 to 23

Sample(s)	Impact strength KJ/m²	Layered situation	Fracture condition
				Example 14	9.9	Without delamination	Smoothing
Comparative example 17	7.22	Slight delamination	Slight burr
				Comparative example 18	9.01	Slight delamination	Slight burr
Comparative example 19	10.35	Slight delamination	Slight burr
				Comparative example 20	10.61	Without delamination	Smoothing
Comparative example 21	11.5	Without delamination	Smoothing
				Comparative example 22	13.6	Without delamination	Smoothing
Comparative example 23	13.8	Without delamination	Smoothing

As can be seen by combining example 14, comparative examples 18 to 23 and Table 6, 0.15kg of SBS was added to comparative example 18, and precipitation was observed on the surface of the recycled ABS plastic, 0.15kg of SBS and 0.15kg of high rubber powder were added to comparative example 19, and precipitation was observed on the surface of the recycled ABS plastic, 0.2kg of SBS and 0.2kg of high rubber powder were added to comparative example 20, and precipitation was not observed on the surface of the recycled ABS plastic, and 0.3kg, 0.4kg and 0.5kg of the SBS thermoplastic elastomer prepared in example 2 were added to comparative examples 21 to 23, respectively, and precipitation was not observed on the surface of the recycled ABS plastic. The result shows that the SBS thermoplastic elastomer prepared in the embodiment 2 has good compatibility with the recycled ABS plastic, and can be well combined with the recycled ABS plastic, so that the impact strength of the recycled ABS plastic can be improved by utilizing the excellent characteristics of the SBS thermoplastic elastomer.

It can also be seen by combining example 14, comparative examples 17-18 and comparative examples 21-23 with Table 6 that, under the same conditions, example 14 added 0.15kg of SBS elastomer, comparative example 17 added no SBS elastomer, comparative example 18 added only 0.15kg of SBS, and comparative examples 21-23 added 0.3kg, 0.4kg and 0.5kg of SBS thermoplastic elastomer prepared in example 2, respectively. It can be seen from Table 6 that the impact strength of the notched impact test bars made of ABS plastic particles with 0.4kg and 0.5kg of SBS thermoplastic elastomer was the greatest, much higher than the impact strength without SBS and with SBS alone. And after the addition amount of the SBS thermoplastic elastomer is increased, the impact strength of the notched impact test strip made of the recycled ABS plastic particles is also increased, the impact strength of the notched impact test strip made of the recycled ABS plastic particles added with 0.4kg and 0.5kg of the SBS thermoplastic elastomer is not different, and the mass of the added SBS thermoplastic elastomer is generally not more than 3% considering the economic applicability.

Comparative examples 19 to 22 and table 6 also show that the impact strength of the notched impact test strip prepared by adding 0.15kg of SBS and 0.15kg of high rubber powder to comparative example 19, and 0.2kg of SBS and 0.2kg of high rubber powder to comparative example 20 was also higher than that of the notched impact test strip prepared by adding both SBS and high rubber powder to the reclaimed ABS plastic particles. The result shows that the SBS elastomer prepared by the method has greatly improved impact strength on the recycled ABS plastic. The reason is probably that the SBS and the rubber oil are combined into the oil-absorbing SBS, the oil-absorbing SBS can be used as a carrier to combine more SSBR and nano-silica, the nano-silica permeates gaps of particles of the SBS and the SSBR to enable the particles to be combined more firmly, meanwhile, the maleic anhydride grafted butadiene is added to serve as a compatilizer, and the maleic anhydride grafted butadiene further enables the SBS and the SSBR to be combined firmly, so that the SBS thermoplastic elastomer is added into the recycled ABS plastic, and the impact resistance of the recycled ABS plastic can be greatly improved.

TABLE 7 data of the Performance test of examples 13-15 and comparative examples 9-16

Sample(s)	Impact strength KJ/m²	Layered situation	Fracture condition
				Example 13	9.34	Without delamination	Smoothing
Example 14	9.9	Without delamination	Smoothing
				Example 15	9.42	Without delamination	Smoothing
Comparative example 9	8.47	Without delamination	Smoothing
				Comparative example 10	8.91	Without delamination	Smoothing
Comparative example 11	8.88	Without delamination	Smoothing
				Comparative example 12	9.32	Without delamination	Smoothing
Comparative example 13	7.83	Layering	Burrs
				Comparative example 14	8.21	Slight delamination	Slight burr
Comparative example 15	5.68	Obvious delamination	More burrs
				Comparative example 16	9.14	Slight delamination	Slight burr

It can be seen from the combination of examples 13-15 and comparative examples 9-16 and table 7 that the SBS, SSBR, rubber oil and nano silica added to the SBS thermoplastic elastomer in the present application all have an influence on it, and need to be combined with each other to obtain more excellent effects, especially the SBS and rubber oil have a larger influence on it. And the SBS elastomer prepared by selecting a proper proportion has certain influence on the impact strength of the regenerated and recycled ABS plastic particles prepared by the SBS elastomer, and the reason is probably that the SBS, the SSBR and other additives added into the SBS elastomer can be better combined by the proper proportion, so that the SBS thermoplastic elastomer with better performance can be obtained. The absence of SBS leads to a deterioration in the toughness of the thermoplastic elastomer obtained, and the absence of rubber oil leads to a poorer bonding of the added substances and thus to a poorer toughness.

Table 8 examples 16-20 performance testing data

Sample(s)	Impact strength KJ/m²	Layered situation	Fracture condition
				Example 16	9.41	Without delamination	Smoothing
Example 17	9.62	Without delamination	Smoothing
				Example 18	9.11	Without delamination	Smoothing
Example 19	9.21	Without delamination	Smoothing
				Example 20	9.27	Without delamination	Smoothing

It can be seen from the combination of examples 16-20 and Table 8 that the styrene and vinyl contents of SBS and SSBR have an effect on the properties of SBS thermoplastic elastomer and thus on the impact strength of recycled ABS plastic particles made therefrom. The reason may be that the appropriate styrene and vinyl contents may enable SBS and SSBR to exhibit better bonding properties when prepared into SBS thermoplastic elastomer, thereby improving the impact resistance of recycled ABS plastic.

TABLE 9 EXAMPLES 21-23 Performance test data

Sample(s)	Impact strength KJ/m²	Layered situation	Fracture condition
				Example 21	9.68	Without delamination	Smoothing
Example 22	9.57	Without delamination	Smoothing
				Example 23	9.52	Without delamination	Smoothing

It can be seen from the combination of examples 21-23 and Table 9 that the particle size of the nanosilica has an effect on the impact strength of the recycled ABS plastic particles, probably because the nanosilica with a suitable particle size has better dispersibility in the system and thus better combines with SBS, SSBR and other additives.

TABLE 10 EXAMPLES 24-25 Performance test data

Sample(s)	Impact strength KJ/m²	Layered situation	Fracture openingSituation(s)
				Example 24	9.72	Without delamination	Smoothing
Example 25	10.16	Without delamination	Smoothing

It can be seen from the combination of example 24 and Table 10 that the impact strength of the recycled ABS plastic particles is affected by the use of different compatibilizers, which may be due to different structural properties of the compatibilizers and different abilities to combine other materials, so that better compatibility can be achieved by selecting proper compatibilizers.

It can be seen from the combination of example 25 and table 10 that the preparation conditions of recycled ABS flakes into recycled ABS plastic particles also have a certain effect on the impact strength thereof, and the recycled ABS plastic particles prepared under suitable preparation conditions have stronger impact strength, probably because the suitable preparation conditions enable the SBS thermoplastic elastomer and the recycled ABS flakes to be better bonded to each other during the preparation process to form more stable recycled ABS plastic particles.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The thermoplastic elastomer is characterized by comprising the following components in parts by mass:

SBS: 20-35 parts;

SSBR: 25-55 parts;

rubber oil: 20-35 parts;

nano silicon dioxide: 5-10 parts;

a compatilizer: 0.5-1.5 parts;

antioxidant: 0.5 to 1.5 portions.

2. The thermoplastic elastomer according to claim 1, wherein the SBS is a linear SBS having a styrene monomer content of 55% to 70% and a vinyl monomer content of 30% to 45%.

3. The thermoplastic elastomer of claim 1, wherein the SSBR has a styrene monomer content of 30% to 50% and a vinyl monomer content of 10% to 30%.

4. Thermoplastic elastomer, according to claim 1, characterised in that the nanosilica has a particle size D50 of 20-60 nm.

5. The thermoplastic elastomer of claim 1, wherein the compatibilizer is one of maleic anhydride grafted styrene or maleic anhydride grafted butadiene.

6. A thermoplastic elastomer, according to claim 1, characterised in that the rubber oil is a naphthenic rubber oil.

7. A process for the preparation of a thermoplastic elastomer as claimed in any of claims 1 to 6, characterized in that it comprises the following steps:

s3, adding 5-10 parts of nano silicon dioxide, continuing stirring, and stopping stirring after the nano silicon dioxide is uniformly dispersed to obtain a mixture 1;

and S4, extruding and granulating the mixture 1 to obtain the thermoplastic elastomer.

8. The application of the thermoplastic elastomer as claimed in any one of claims 1 to 6 or the thermoplastic elastomer prepared by the preparation method as claimed in claim 7 is characterized in that the thermoplastic elastomer is applied to renewable recycled ABS plastics, and the addition amount of the thermoplastic elastomer is not more than 3%.

9. The preparation method of the recycled ABS plastic is characterized by comprising the following steps:

s4, granulating;

10. Recycled ABS plastic, characterized in that it is obtained by a process as claimed in claim 9.