Antibacterial high-elasticity toy material and preparation method thereof

Abstract

The invention relates to the field of plastic materials, in particular to an antibacterial high-elasticity toy material and a preparation method thereof.The toy material is prepared from, by weight, 20-40 parts of polycarbonate, 35-55 parts of modified polyurethane elastomer, 5-10 parts of SEBS-g-MAH, 10-20 parts of filler, 6-12 parts of plasticizer, 1-3 parts of lubricant, 0.6-1.8 parts of antibacterial agent, 0.4-1 part of antioxidant and 0.5-1.5 parts of anti-ultraviolet agent. The polycarbonate and the modified polyurethane elastomer are used as main raw materials, and the filler and various additives are used as auxiliary materials, so that the novel toy material is prepared. The toy material has the advantages of high strength and high elasticity, and also has excellent long-term antibacterial activity.

Description

Technical Field

[0001] The invention relates to the field of plastic materials, and in particular to an antibacterial and highly elastic toy material and a preparation method thereof. Background Art

[0002] Toys are children's first textbooks. Playing games with toys can not only enrich children's lives and bring them happiness, but also open the door to children's cognitive world in the process of playing, which plays a good role in developing children's intelligence and imagination. With the progress of society, the frequency of use of toys is increasing, and there are more and more types. According to the material, they can be divided into metal toys, plastic toys, rubber toys, bamboo toys, cloth toys, paper toys, etc. Among them, plastic toys have an increasing share in toys due to their advantages of light weight, easy to move, good shape, flexible and diverse colors, easy molding and processing, and economy.

[0003] Plastic toys must not only meet the requirements of unique shapes, but also be able to withstand the test of the environment. Plastic toys made of traditional materials are no longer the main demand of the current market. They have defects such as poor mechanical strength and poor elasticity, which affect the beauty and service life of the toys. At the same time, the functions are relatively simple and they do not have antibacterial functions. Over time, their outer surface will become dirty and prone to odor. Especially in kindergartens, which are children's gathering areas, the frequency of using toys is very high, and it is easier to breed or reproduce various harmful bacteria, molds, viruses and other microorganisms, becoming a public transmission source, causing great trouble to children's health. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an antibacterial and highly elastic toy material and a preparation method thereof.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention provides an antibacterial and highly elastic toy material, which comprises, by weight:

[0007] 20-40 parts of polycarbonate, 35-55 parts of modified polyurethane elastomer, 5-10 parts of SEBS-g-MAH, 10-20 parts of filler, 6-12 parts of plasticizer, 1-3 parts of lubricant, 0.6-1.8 parts of antibacterial agent, 0.4-1 parts of antioxidant and 0.5-1.5 parts of UV protection agent.

[0008] Preferably, the density of the polycarbonate is 1.18-1.22 g / cm 3 , the melt index is 8-12g / 10min (300℃ / 1.2kg).

[0009] Preferably, the SEBS-g-MAH is a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer, has a melt index of 1.0-2.0 g / 10 min (190° C. / 5 kg), and a grafting rate of maleic anhydride (MAH) of 1.4%-2.0%.

[0010] Preferably, the filler is silicon dioxide and calcium carbonate in a mass ratio of 5-8:1, and the particle size is 100-200 nm.

[0011] Preferably, the plasticizer is one or more of tributyl citrate, acetyl tributyl citrate, and epoxidized soybean oil.

[0012] Preferably, the lubricant is one or more of stearic acid, liquid paraffin, calcium stearate, and magnesium stearate.

[0013] Preferably, the antibacterial agent is nano zinc oxide particles with a particle size of 20-50 nm.

[0014] Preferably, the antioxidant is one or more of antioxidant 1098, antioxidant 1010, antioxidant 1076, and antioxidant 1330.

[0015] Preferably, the UV-blocking agent is one or more of UV-531, UV-327, and UV-326.

[0016] Preferably, the preparation method of the modified polyurethane elastomer comprises:

[0017] S1, weighing dithioerythritol (DTE) and 4-hydroxybutyl vinyl ether (HBVE), mixing them in tetrahydrofuran, introducing nitrogen as a protective gas, adding a photoinitiator after fully mixing, stirring at room temperature for 10-30 minutes under the action of ultraviolet light, and then removing the solvent by rotary evaporation to obtain modified erythritol;

[0018] S2, weighing modified erythritol and isophorone diisocyanate, mixing them in N,N-dimethylformamide, stirring and reacting at 60-80° C. for 2-4 hours to obtain a prepolymerization reaction liquid;

[0019] S3. Add chain extender and catalyst to the prepolymerization reaction liquid respectively, raise the temperature to 75-85°C, stir and react for 2-4h, then cool to 35-55°C, dropwise add neutralizer, stir for 0.2-0.6h and the reaction is completed, remove the solvent by rotary evaporation, wash with water and vacuum dry to obtain a modified polyurethane elastomer.

[0020] Preferably, in S1, the mass volume ratio of dithioerythritol (DTE), 4-hydroxybutyl vinyl ether (HBVE) and tetrahydrofuran is 1.5 g: (2.1-2.5) g: (10-20) mL.

[0021] Preferably, in S1, the photoinitiator is dimethyl benzoate (DMPA), and the added amount is 1%-5% of the mass of 4-hydroxybutyl vinyl ether (HBVE).

[0022] Preferably, in S1, the wavelength of the ultraviolet light is 350-405nm, and the power is 10-100mW / cm 2 .

[0023] Preferably, in S2, the mass volume ratio of modified erythritol, isophorone diisocyanate and N,N-dimethylformamide is 3.6 g:(5.62-5.89) g:(30-50) mL.

[0024] Preferably, in S3, the chain extender is 1,4-butanediol, and the added amount is 6.8%-8.9% of the mass of isophorone diisocyanate.

[0025] Preferably, in S3, the catalyst is dibutyltin dilaurate, and the added amount is 0.05%-0.2% of the mass of isophorone diisocyanate.

[0026] Preferably, in S3, the neutralizing agent is triethylamine, and the added amount is 2%-8% of the mass of isophorone diisocyanate.

[0027] In a second aspect, the present invention provides a method for preparing an antibacterial and highly elastic toy material, comprising the following steps:

[0028] Step 1, weighing polycarbonate, modified polyurethane elastomer, SEBS-g-MAH, filler, plasticizer, lubricant, antibacterial agent, antioxidant and UV blocker and drying them in an oven to constant weight;

[0029] Step 2, adding the raw materials of step 1 into a blender, stirring at a speed of 100-200 r / min for 20-30 min to obtain a uniform mixture;

[0030] Step 3, introducing the uniform mixture of step 2 into a twin-screw extruder for extrusion granulation, wherein the temperature range is 220-260° C. and the screw speed is 50-100 r / min to obtain a toy material.

[0031] The beneficial effects of the present invention are:

[0032] 1. The present invention uses polycarbonate and modified polyurethane elastomer as main raw materials, supplemented with fillers and various additives, to prepare a new type of toy material. The toy material has the advantages of high strength and high elasticity, and also has excellent long-term antibacterial properties.

[0033] 2. The modified polyurethane elastomer of the present invention is prepared by polymerization reaction using modified erythritol as polyol, isophorone diisocyanate as isocyanate, and 1,4-butanediol as chain extender. The modified erythritol is prepared by thiol-double bond click reaction of dithioerythritol and 4-hydroxybutyl vinyl ether, the molar ratio of dithioerythritol and 4-hydroxybutyl vinyl ether is controlled at about 1:2, and the obtained modified erythritol is a polyol compound containing four hydroxyl groups.

[0034] 3. The modified polyurethane elastomer prepared by the present invention is green, environmentally friendly, highly tough and highly stable; in addition, since the raw material modified erythritol contains thioether group (RSR), the modified polyurethane elastomer is endowed with good antibacterial properties. When compounded with polycarbonate as a toy material, it has better strength, elasticity and antibacterial properties than traditional polyurethane elastomers.

[0035] 4. Since nano zinc oxide as an antibacterial agent mainly relies on photocatalysis to produce active oxygen for sterilization, its antibacterial property in a dark environment is relatively poor. The modified polyurethane elastomer of the present invention has a certain antibacterial property, which can make up for the antibacterial performance in a dark environment, thereby enhancing the antibacterial property of the toy material as a whole. DETAILED DESCRIPTION

[0036] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] The present invention will be further described below in conjunction with the following examples.

[0038] Example 1

[0039] An antibacterial and highly elastic toy material, calculated by weight, comprising:

[0040] 30 parts of polycarbonate, 45 parts of modified polyurethane elastomer, 8 parts of SEBS-g-MAH, 15 parts of filler, 8 parts of plasticizer, 2 parts of lubricant, 1.2 parts of antibacterial agent, 0.7 parts of antioxidant and 1 part of UV protection agent.

[0041] Among them, the density of polycarbonate is 1.2g / cm 3, melt index is 10g / 10min (300℃ / 1.2kg); SEBS-g-MAH is maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer, melt index is 1.5g / 10min (190℃ / 5kg), and the grafting rate of maleic anhydride (MAH) is 1.7%; the filler is silicon dioxide and calcium carbonate in a mass ratio of 6:1, and the particle size is 100nm; the plasticizer is epoxidized soybean oil; the lubricant is calcium stearate; the antibacterial agent is nano zinc oxide particles with a particle size of 20nm; the antioxidant is antioxidant 1098; the UV blocker is UV-531.

[0042] Wherein, the preparation method of modified polyurethane elastomer comprises:

[0043] S1. Weigh 1.5 g of dithioerythritol (DTE) and 2.3 g of 4-hydroxybutyl vinyl ether (HBVE) and mix them in 15 mL of tetrahydrofuran. Pass nitrogen as protective gas. After thorough mixing, add 3% of the mass of 4-hydroxybutyl vinyl ether (HBVE) as a photoinitiator, dimethyl benzoate (DMPA). At a wavelength of 365 nm and a power of 50 mW / cm 2 Under the action of ultraviolet light, the mixture was stirred at room temperature for 20 minutes, and then the solvent was removed by rotary evaporation to obtain modified erythritol;

[0044] S2, weigh 3.6 g of modified erythritol and 5.73 g of isophorone diisocyanate, mix them in 40 mL of N,N-dimethylformamide, and stir and react at 70° C. for 3 h to obtain a prepolymerization reaction solution;

[0045] S3. Add 7.7% by weight of 1,4-butanediol and 1.5% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 80°C, stir and react for 3 hours, then cool to 45°C, dropwise add 5% by weight of triethylamine, stir for 0.4 hours to terminate the reaction, remove the solvent by rotary evaporation, wash with water and dry in vacuum to obtain a modified polyurethane elastomer.

[0046] The method for preparing the above-mentioned antibacterial and highly elastic toy material comprises the following steps:

[0047] Step 1, weighing polycarbonate, modified polyurethane elastomer, SEBS-g-MAH, filler, plasticizer, lubricant, antibacterial agent, antioxidant and UV blocker and drying them in an oven to constant weight;

[0048] Step 2, adding the raw materials in step 1 into a blender, stirring at a speed of 150 r / min for 25 min to obtain a uniform mixture;

[0049] Step 3, introducing the uniform mixture of step 2 into a twin-screw extruder for extrusion granulation, wherein the temperature range is 220-260° C. and the screw speed is 70 r / min to obtain a toy material.

[0050] Example 2

[0051] An antibacterial and highly elastic toy material, calculated by weight, comprising:

[0052] 20 parts of polycarbonate, 35 parts of modified polyurethane elastomer, 5 parts of SEBS-g-MAH, 10 parts of filler, 6 parts of plasticizer, 1 part of lubricant, 0.6 parts of antibacterial agent, 0.4 parts of antioxidant and 0.5 parts of UV protection agent.

[0053] Among them, the density of polycarbonate is 1.2g / cm 3 , melt index is 10g / 10min (300℃ / 1.2kg); SEBS-g-MAH is maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer, melt index is 1.5g / 10min (190℃ / 5kg), and the grafting rate of maleic anhydride (MAH) is 1.7%; the filler is silicon dioxide and calcium carbonate in a mass ratio of 5:1, and the particle size is 100nm; the plasticizer is tributyl citrate; the lubricant is stearic acid; the antibacterial agent is nano zinc oxide particles with a particle size of 20nm; the antioxidant is antioxidant 1010; the UV blocker is UV-327.

[0054] Wherein, the preparation method of modified polyurethane elastomer comprises:

[0055] S1. Weigh 1.5 g of dithioerythritol (DTE) and 2.1 g of 4-hydroxybutyl vinyl ether (HBVE) and mix them in 10 mL of tetrahydrofuran. Pass nitrogen as protective gas. After thorough mixing, add 1% of the mass of 4-hydroxybutyl vinyl ether (HBVE) as a photoinitiator, dimethyl benzoate (DMPA). At a wavelength of 365 nm and a power of 60 mW / cm 2 Under the action of ultraviolet light, the mixture was stirred at room temperature for 10 minutes, and then the solvent was removed by rotary evaporation to obtain modified erythritol;

[0056] S2, weigh 3.6 g of modified erythritol and 5.62 g of isophorone diisocyanate, mix them in 30 mL of N,N-dimethylformamide, and stir and react at 60° C. for 2 h to obtain a prepolymerization reaction solution;

[0057] S3. Add 6.8% by weight of isophorone diisocyanate of 1,4-butanediol and 0.5% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 75°C, stir and react for 2 hours, then cool to 35°C, dropwise add 2% by weight of isophorone diisocyanate of triethylamine, stir for 0.2 hours until the reaction ends, remove the solvent by rotary evaporation, wash with water and dry in vacuum to obtain a modified polyurethane elastomer.

[0058] The method for preparing the above-mentioned antibacterial and highly elastic toy material comprises the following steps:

[0059] Step 1, weighing polycarbonate, modified polyurethane elastomer, SEBS-g-MAH, filler, plasticizer, lubricant, antibacterial agent, antioxidant and UV blocker and drying them in an oven to constant weight;

[0060] Step 2, adding the raw materials of step 1 into a blender, and stirring at a speed of 100 r / min for 20 min to obtain a uniform mixture;

[0061] Step 3, introducing the uniform mixture of step 2 into a twin-screw extruder for extrusion granulation, wherein the temperature range is 220-260° C. and the screw speed is 50 r / min to obtain a toy material.

[0062] Example 3

[0063] An antibacterial and highly elastic toy material, calculated by weight, comprising:

[0064] 40 parts of polycarbonate, 55 parts of modified polyurethane elastomer, 10 parts of SEBS-g-MAH, 20 parts of filler, 12 parts of plasticizer, 3 parts of lubricant, 1.8 parts of antibacterial agent, 1 part of antioxidant and 1.5 parts of UV inhibitor.

[0065] Among them, the density of polycarbonate is 1.2g / cm 3 , melt index is 10g / 10min (300℃ / 1.2kg); SEBS-g-MAH is maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer, melt index is 1.5g / 10min (190℃ / 5kg), and the grafting rate of maleic anhydride (MAH) is 1.7%; the filler is silicon dioxide and calcium carbonate in a mass ratio of 8:1, and the particle size is 200nm; the plasticizer is acetyl tributyl citrate; the lubricant is liquid paraffin; the antibacterial agent is nano zinc oxide particles with a particle size of 50nm; the antioxidant is antioxidant 1330; the UV blocker is UV-326.

[0066] Wherein, the preparation method of modified polyurethane elastomer comprises:

[0067] S1. Weigh 1.5 g of dithioerythritol (DTE) and 2.5 g of 4-hydroxybutyl vinyl ether (HBVE) and mix them in 20 mL of tetrahydrofuran. Pass nitrogen as protective gas. After thorough mixing, add 5% of the mass of 4-hydroxybutyl vinyl ether (HBVE) as a photoinitiator, dimethyl benzoate (DMPA). At a wavelength of 365 nm and a power of 80 mW / cm 2 Under the action of ultraviolet light, the mixture was stirred at room temperature for 30 minutes, and then the solvent was removed by rotary evaporation to obtain modified erythritol;

[0068] S2, weigh 3.6 g of modified erythritol and 5.89 g of isophorone diisocyanate, mix them in 50 mL of N,N-dimethylformamide, and stir and react at 80° C. for 4 h to obtain a prepolymerization reaction solution;

[0069] S3. Add 8.9% by weight of 1,4-butanediol and 2% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 85°C, stir and react for 4 hours, then cool to 55°C, add 8% by weight of triethylamine, stir for 0.6 hours, and the reaction ends. Remove the solvent by rotary evaporation, wash with water and dry in vacuum to obtain a modified polyurethane elastomer.

[0070] The method for preparing the above-mentioned antibacterial and highly elastic toy material comprises the following steps:

[0071] Step 1, weighing polycarbonate, modified polyurethane elastomer, SEBS-g-MAH, filler, plasticizer, lubricant, antibacterial agent, antioxidant and UV blocker and drying them in an oven to constant weight;

[0072] Step 2, adding the raw materials of step 1 into a blender, stirring at a speed of 200 r / min for 30 min to obtain a uniform mixture;

[0073] Step 3, introducing the uniform mixture of step 2 into a twin-screw extruder for extrusion granulation, wherein the temperature range is 220-260° C. and the screw speed is 100 r / min to obtain a toy material.

[0074] Comparative Example 1

[0075] An antibacterial and highly elastic toy material, which differs from Example 1 in that the modified polyurethane elastomer in the composition is replaced by a traditional neopentyl glycol polyurethane elastomer. Calculated by weight, it includes:

[0076] 30 parts of polycarbonate, 45 parts of neopentyl glycol polyurethane elastomer, 8 parts of SEBS-g-MAH, 15 parts of filler, 8 parts of plasticizer, 2 parts of lubricant, 1.2 parts of antibacterial agent, 0.7 parts of antioxidant and 1 part of UV protection agent.

[0077] Wherein, the preparation method of neopentyl glycol polyurethane elastomer comprises:

[0078] S1, weigh 2.63g of neopentyl glycol and 5.73g of isophorone diisocyanate, mix them in 50mL of N,N-dimethylformamide, and stir them at 80°C for 4h to obtain a prepolymerization reaction liquid;

[0079] S3. Add 7.7% by weight of 1,4-butanediol and 1.5% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 80°C, stir and react for 3 hours, then cool to 45°C, dropwise add 5% by weight of triethylamine, stir for 0.4 hours to terminate the reaction, remove the solvent by rotary evaporation, wash with water and then dry in vacuum to obtain a neopentyl glycol polyurethane elastomer.

[0080] Comparative Example 2

[0081] An antibacterial and highly elastic toy material, which differs from Example 1 in that the modified polyurethane elastomer in the composition is replaced by dithioerythritol polyurethane elastomer. Calculated by weight, it includes:

[0082] 30 parts of polycarbonate, 45 parts of dithioerythritol polyurethane elastomer, 8 parts of SEBS-g-MAH, 15 parts of filler, 8 parts of plasticizer, 2 parts of lubricant, 1.2 parts of antibacterial agent, 0.7 parts of antioxidant and 1 part of UV protection agent.

[0083] Wherein, the preparation method of dithioerythritol polyurethane elastomer comprises:

[0084] S1, weigh 1.5 g of dithioerythritol and 5.73 g of isophorone diisocyanate, mix them in 50 mL of N,N-dimethylformamide, and stir and react at 80° C. for 4 h to obtain a prepolymerization reaction solution;

[0085] S3. Add 7.7% by weight of 1,4-butanediol and 1.5% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 80°C, stir and react for 3 hours, then cool to 45°C, dropwise add 5% by weight of triethylamine, stir for 0.4 hours to terminate the reaction, remove the solvent by rotary evaporation, wash with water and then dry in vacuum to obtain dithioerythritol polyurethane elastomer.

[0086] Comparative Example 3

[0087] An antibacterial and highly elastic toy material, which differs from Example 1 in that the modified polyurethane elastomer in the ingredients is prepared by a different method. Calculated by weight, it comprises:

[0088] 30 parts of polycarbonate, 45 parts of modified polyurethane elastomer, 8 parts of SEBS-g-MAH, 15 parts of filler, 8 parts of plasticizer, 2 parts of lubricant, 1.2 parts of antibacterial agent, 0.7 parts of antioxidant and 1 part of UV protection agent.

[0089] Wherein, the preparation method of modified polyurethane elastomer comprises:

[0090] S1, weigh 1.5 g of dithioerythritol, 2.3 g of 4-hydroxybutyl vinyl ether and 5.73 g of isophorone diisocyanate, mix them in 50 mL of N,N-dimethylformamide, and stir them at 80° C. for 4 h to obtain a prepolymerization reaction solution;

[0091] S3. Add 7.7% by weight of 1,4-butanediol and 1.5% by weight of dibutyltin dilaurate into the prepolymerization reaction liquid respectively, raise the temperature to 80°C, stir and react for 3 hours, then cool to 45°C, dropwise add 5% by weight of triethylamine, stir for 0.4 hours to terminate the reaction, remove the solvent by rotary evaporation, wash with water and dry in vacuum to obtain a modified polyurethane elastomer.

[0092] The mechanical properties of the toy materials prepared in Example 1 and Comparative Examples 1-3 were tested. The tensile strength and elongation at break were tested according to ASTM D638, the impact strength was tested according to ASTM D6110 (simple supported beam), and the flexural modulus was tested according to ASTM D790. The results are shown in Table 1:

[0093] Table 1 Comparison of mechanical properties of different toy materials

[0094] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength(MPa) 32 30 28 25 Elongation at break (%) 383 375 378 367 <![CDATA[Impact strength (kJ / m 2 )]]> 41 39 38 35 Flexural modulus(GPa) 2.4 2.1 2.1 2.0

[0095] The antibacterial performance of the toy materials prepared in Example 1 and Comparative Examples 1-3 was tested. The antibacterial test included Escherichia coli and Staphylococcus aureus. The test included the lighting environment (artificial xenon lamp, 0.55W / m 2 ) and dark environment (completely away from light). The test method refers to GB / T 31402-2015 "Test method for antibacterial properties of plastic surfaces". The test results are shown in Table 2:

[0096] Table 2 Comparison of antibacterial properties of different toy materials

[0097]

[0098] It can be seen from Table 1 that the toy material prepared in Example 1 of the present invention has excellent strength and elasticity, and it can be seen from Table 2 that the toy material prepared in Example 1 of the present invention has an antibacterial property against Escherichia coli and Staphylococcus aureus of not less than 99% in either light or dark environments. The strength and elasticity of the traditional toy material (Comparative Example 1) are also good, but overall they are not as good as those in Example 1, and the antibacterial property in dark environments is poor.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

Claims

1. An antibacterial and highly elastic toy material, characterized in that: Calculated by weight, including: 20-40 parts of polycarbonate, 35-55 parts of modified polyurethane elastomer, 5-10 parts of SEBS-g-MAH, 10-20 parts of filler, 6-12 parts of plasticizer, 1-3 parts of lubricant, 0.6-1.8 parts of antibacterial agent, 0.4-1 parts of antioxidant and 0.5-1.5 parts of UV protection agent.

2. The antibacterial and highly elastic toy material according to claim 1, characterized in that: The filler is silicon dioxide and calcium carbonate in a mass ratio of 5-8:1, and the particle size is 100-200nm.

3. The antibacterial and highly elastic toy material according to claim 1, characterized in that: The plasticizer is one or more of tributyl citrate, acetyl tributyl citrate, and epoxidized soybean oil.

4. The antibacterial and highly elastic toy material according to claim 1, characterized in that: The lubricant is one or more of stearic acid, liquid paraffin, calcium stearate and magnesium stearate; the antibacterial agent is nano zinc oxide particles with a particle size of 20-50nm.

5. The antibacterial and highly elastic toy material according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 1098, antioxidant 1010, antioxidant 1076, and antioxidant 1330; the UV-blocking agent is one or more of UV-531, UV-327, and UV-326.

6. The antibacterial and highly elastic toy material according to claim 1, characterized in that: The preparation method of the modified polyurethane elastomer comprises: S1, weighing dithioerythritol and 4-hydroxybutyl vinyl ether, mixing them in tetrahydrofuran, introducing nitrogen as a protective gas, adding a photoinitiator after fully mixing, stirring at room temperature for 10-30 minutes under the action of ultraviolet light, and then removing the solvent by rotary evaporation to obtain modified erythritol; S2, weighing modified erythritol and isophorone diisocyanate, mixing them in N,N-dimethylformamide, stirring and reacting at 60-80° C. for 2-4 hours to obtain a prepolymerization reaction liquid; S3. Add chain extender and catalyst to the prepolymerization reaction liquid respectively, raise the temperature to 75-85°C, stir and react for 2-4h, then cool to 35-55°C, dropwise add neutralizer, stir for 0.2-0.6h and the reaction is completed, remove the solvent by rotary evaporation, wash with water and vacuum dry to obtain a modified polyurethane elastomer.

7. The antibacterial and highly elastic toy material according to claim 6, characterized in that: In the S1, the mass volume ratio of dithioerythritol, 4-hydroxybutyl vinyl ether and tetrahydrofuran is 1.5 g: (2.1-2.5) g: (10-20) mL.

8. The antibacterial and highly elastic toy material according to claim 6, characterized in that: In the S2, the mass volume ratio of modified erythritol, isophorone diisocyanate and N,N-dimethylformamide is 3.6 g:(5.62-5.89) g:(30-50) mL.

9. The antibacterial and highly elastic toy material according to claim 6, characterized in that: In S3, the chain extender is 1,4-butanediol, and the added amount is 6.8%-8.9% of the mass of isophorone diisocyanate; the catalyst is dibutyltin dilaurate, and the added amount is 0.05%-0.2% of the mass of isophorone diisocyanate; the neutralizer is triethylamine, and the added amount is 2%-8% of the mass of isophorone diisocyanate.

10. A method for preparing the antibacterial and highly elastic toy material according to claim 1, characterized in that: The following steps are involved: Step 1, weighing polycarbonate, modified polyurethane elastomer, SEBS-g-MAH, filler, plasticizer, lubricant, antibacterial agent, antioxidant and UV blocker and drying them in an oven to constant weight; Step 2, adding the raw materials of step 1 into a blender, stirring at a speed of 100-200 r / min for 20-30 min to obtain a uniform mixture; Step 3, introducing the uniform mixture of step 2 into a twin-screw extruder for extrusion granulation, wherein the temperature range is 220-260° C. and the screw speed is 50-100 r / min to obtain a toy material.

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