A core-shell structure modified nylon plastic and preparation method thereof

Abstract

The invention relates to the technical field of nylon, and in particular to a core-shell structure modified nylon plastic and a preparation method thereof. The core-shell structure modified nylon plastic comprises the following raw materials in parts by weight: 100-150 parts of nylon, 20-40 parts of silicon copolymer polycarbonate, 5-9 parts of dimethyl silicone oil, 10-15 parts of a core-shell structure modifier, 0.5-1 parts of a vulcanizer and 0.5-1.5 parts of a dispersant; wherein the core-shell structure modifier is a core-shell structure with olefinic silica microspheres as cores and single-end hydrogen-containing silicone oil as shells, and the olefinic silica microspheres are obtained by grafting vinyl tris(β-methoxyethoxy) silane onto silica microspheres. The core-shell structure modified nylon plastic of the invention can be used for manufacturing high-performance engineering plastics, such as automotive parts, electronic devices and the like, and has broad market application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of nylon, and in particular to a core-shell structure modified nylon plastic and a preparation method thereof. Background Art

[0002] Nylon is a plastic material widely used in the industrial field. Nylon has high strength, heat resistance and corrosion resistance, but it also has some limitations, such as brittleness and low toughness. Therefore, nylon needs to be modified to improve its mechanical properties. Common nylon modification methods include composite modification, additive modification, chemical modification, etc. These modification methods can significantly improve the mechanical properties of nylon, but they also have some shortcomings. For example, the modified nylon may have problems such as poor solidification, color change and performance loss. The core-shell structure is a layered structure formed at the interface of the material. Due to its special structure, the material can have good mechanical properties and toughness. Therefore, the core-shell structure is widely used in the preparation of modified materials, especially polymer materials.

[0003] Core-shell structure modified nylon plastics are mainly achieved by adding core-shell structure reinforcing materials to nylon. The core-shell structure reinforcing material can be a microparticle, nanoparticle or organic-inorganic hybrid, which can increase the strength and toughness of nylon. At the same time, adding core-shell structure reinforcing materials to the nylon molecular chain can also increase the thermal stability and corrosion resistance of the material. Methods for preparing core-shell structure modified nylon plastics include solution blending, melt blending, in-situ polymerization, etc. Among them, melt blending is the most common method for preparing core-shell structure modified nylon plastics, which is achieved by mixing nylon and core-shell structure reinforcing materials at high temperature and melting the mixture into granular or sheet materials.

[0004] Chinese invention patent CN113563593B discloses a core-shell toughening agent, a preparation method thereof, and toughened nylon used therein. The core-shell toughening agent of the invention has a core-shell structure with a polyketone graft as a shell and an EPDM graft as a core. The toughening agent prepared in the application and the nylon are melt-coextruded to help improve the toughness of the nylon. However, when the nylon and the toughening agent of the invention are mixed and prepared, the temperature of the extruder is as high as 200°C. At this temperature, the core-shell toughening agent of the invention will melt, which will lead to structural deformation and a decrease in the toughening effect. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a core-shell structure modified nylon plastic and a preparation method thereof, so as to solve the problem that when the traditional polymer core-shell structure is melted and blended with nylon, its core-shell structure is easily deformed, resulting in a decrease in the toughening effect.

[0006] Based on the above purpose, the present invention provides a core-shell structure modified nylon plastic, comprising the following raw materials in parts by weight: 100-150 parts of nylon, 20-40 parts of silicon copolymer polycarbonate, 5-9 parts of dimethyl silicone oil, 10-15 parts of core-shell structure modifier, 0.5-1 parts of vulcanizer and 0.5-1.5 parts of dispersant;

[0007] The core-shell structure modifier is a core-shell structure with olefinic silica microspheres as core and single-ended hydrogen-containing silicone oil as shell. The olefinic silica microspheres are obtained by grafting vinyl tri(β-methoxyethoxy) silane onto silica microspheres.

[0008] The specific preparation method of the core-shell structure modifier is as follows:

[0009] S1: dispersing silica microspheres in a mixed solution of anhydrous ethanol and water, then adding vinyl tri(β-methoxyethoxy)silane, stirring and reacting at 60-80° C. for 5-8 hours, washing, and drying to obtain olefinated silica microspheres;

[0010] S2: Under N2 protection, add olefinated silica microspheres into anhydrous ethanol, and then add single-ended hydrogenated silicone oil dropwise at 30-50°C and 80-120rpm for 30-45min. After the addition is completed, react at 60-80°C and 80-120rpm for 2-4h, wash, and dry to obtain a core-shell structure modifier.

[0011] The nylon is a mixture of one or more of nylon 6, nylon 66, nylon 610, nylon 1010, nylon 11, nylon 12, nylon 9T or nylon 12T.

[0012] Wherein, the model of the silicon copolymer polycarbonate is EXL1414T.

[0013] Wherein, the average molecular weight of the dimethyl silicone oil is 5000-10000.

[0014] Wherein, the vulcanizing agent is one of benzoyl peroxide, 2,4-dichlorobenzoyl peroxide or tert-butyl perbenzoate.

[0015] Wherein, the dispersant is a mixture of polyethylene glycol and stearamide in a weight ratio of 1-3:1.

[0016] Wherein, the single-ended hydrogen-containing silicone oil is of a type RH-222-4 or RH-222-10.

[0017] Wherein, the average diameter of the silica microspheres is 150-250nm.

[0018] Wherein, in the step S1, the weight ratio of silica microspheres, anhydrous ethanol, water and vinyl tri(β-methoxyethoxy) silane is 5-10:5-10:50-100:0.05-0.1; and in the step S2, the weight ratio of olefinated silica microspheres, anhydrous ethanol and single-ended hydrogenated silicone oil is 5-10:50-100:1-3.

[0019] Furthermore, the present invention also provides a method for preparing the core-shell structure modified nylon plastic. The specific preparation method is as follows:

[0020] S3: weigh 100-150 parts of nylon, 20-40 parts of silicon copolymer polycarbonate, 5-9 parts of dimethyl silicone oil, 10-15 parts of core-shell structure modifier, 0.5-1 part of vulcanizing agent and 0.5-1.5 parts of dispersant according to weight parts for later use;

[0021] S4: drying the nylon and silicon copolymer polycarbonate in a vacuum oven at a temperature of 90-120° C. for 1-2 hours to obtain a pretreated resin;

[0022] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1-2 hours at a stirring rate of 800-1200 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 30-50 minutes to obtain a mixture;

[0023] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the feed port to the die of the extruder is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 200-300r / min, water-cooling and pelletizing, and the core-shell structure modified nylon plastic is obtained after packaging.

[0024] Beneficial effects of the present invention:

[0025] The present invention provides a nylon plastic modified with a core-shell structure, wherein a layer of silicone rubber is formed on the surface of the core-shell structure modifier, and the silicone rubber with thermosetting properties improves the problem of easy deformation when the traditional polymer core-shell structure is blended and melted with nylon, and the silicone rubber has relatively high toughness, thereby improving the toughening effect. The present invention also provides a method for preparing the core-shell structure modified nylon plastic, which is simple and efficient. The core-shell structure modified nylon plastic of the present invention can be used to manufacture high-performance engineering plastics, such as automotive parts, electronic devices, etc., and has a wide market application prospect.

[0026] The invention provides a nylon plastic with a core-shell structure modification, wherein the core-shell structure modifier has a core-shell structure with olefinic silica microspheres as cores and single-ended hydrogen-containing silicone oil as shells, the single-ended hydrogen-containing silicone oil can undergo addition reaction with the olefinic groups on the surfaces of the olefinic silica microspheres, and in the subsequent melt mixing process with silicon copolymer polycarbonate, dimethyl silicone oil and a vulcanizing agent, the single-ended hydrogen-containing silicone oil on the surface of the core-shell structure modifier can further generate crosslinks with the dimethyl silicone oil and the silicon copolymer polycarbonate, thereby promoting the dispersion and compatibility of the core-shell structure modifier in the nylon plastic. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0028] The properties of the raw materials in the specific implementation mode of the present invention are as follows:

[0029] The average molecular weight of dimethyl silicone oil is 8000; the average diameter of silica microspheres is 190 nm.

[0030] Example 1

[0031] S1: 5 g of silica microspheres were dispersed in a mixed solution of 5 g of anhydrous ethanol and 50 g of water, and then 0.05 g of vinyl tri(β-methoxyethoxy)silane was added, and the mixture was stirred at 60° C. for 5 h, washed, and dried to obtain olefinated silica microspheres;

[0032] S2: Under N2 protection, 5 g of olefinated silica microspheres were added to 50 g of anhydrous ethanol, and then 1 g of RH-222-4 was added dropwise at 3 ° C and 80 rpm for 30 min. After the addition was completed, the mixture was reacted at 60 ° C and 80 rpm for 2 h, washed, and dried to obtain a core-shell structure modifier;

[0033] S3: weigh 100 g nylon 6, 20 g EXL1414T, 5 g dimethyl silicone oil, 10 g core-shell structure modifier, 0.5 g benzoyl peroxide, 0.25 g polyethylene glycol and 0.25 g stearamide for later use;

[0034] S4: drying nylon 6 and EXL1414T in a vacuum oven at 90°C for 1 hour to obtain a pretreated resin;

[0035] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing at a stirring rate of 800 r / min for 1 h, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 30 min to obtain a mixture;

[0036] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the extruder feed port to the die head is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 200r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0037] Example 2

[0038] S1: 7.5 g of silica microspheres were dispersed in a mixed solution of 7.5 g of anhydrous ethanol and 75 g of water, and then 0.08 g of vinyl tri(β-methoxyethoxy)silane was added, and the mixture was stirred at 70° C. for 6.5 h, washed, and dried to obtain olefinated silica microspheres;

[0039] S2: Under N2 protection, 7.5 g of olefinated silica microspheres were added to 75 g of anhydrous ethanol, and then 2 g of RH-222-4 was added dropwise at 40 ° C and 100 rpm for 40 min. After the addition was completed, the mixture was reacted at 70 ° C and 100 rpm for 3 h, washed, and dried to obtain a core-shell structure modifier;

[0040] S3: weigh 125 g nylon 6, 30 g EXL1414T, 7 g dimethyl silicone oil, 12.5 g core-shell structure modifier, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0041] S4: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0042] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0043] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the extruder feed port to the die head is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 250r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0044] Example 3

[0045] S1: 10 g of silica microspheres were dispersed in a mixed solution of 10 g of anhydrous ethanol and 100 g of water, and then 0.1 g of vinyl tri(β-methoxyethoxy)silane was added, and the mixture was stirred at 80° C. for 8 h, washed, and dried to obtain olefinated silica microspheres;

[0046] S2: Under N2 protection, 10 g of olefinated silica microspheres were added to 100 g of anhydrous ethanol, and then 3 g of RH-222-4 was added dropwise at 50 ° C and 120 rpm for 45 min. After the addition was completed, the mixture was reacted at 80 ° C and 120 rpm for 4 h, washed, and dried to obtain a core-shell structure modifier;

[0047] S3: weigh 150 g nylon 6, 40 g EXL1414T, 9 g dimethyl silicone oil, 15 g core-shell structure modifier, 1 g benzoyl peroxide, 1 g polyethylene glycol and 0.5 g stearamide for later use;

[0048] S4: drying nylon 6 and EXL1414T in a vacuum oven at 120°C for 2 hours to obtain a pretreated resin;

[0049] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 2 h at a stirring rate of 1200 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 50 min to obtain a mixture;

[0050] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the feed port to the die of the extruder is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 300r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0051] Example 4

[0052] S1: 7.5 g of silica microspheres were dispersed in a mixed solution of 7.5 g of anhydrous ethanol and 75 g of water, and then 0.05 g of vinyl tri(β-methoxyethoxy)silane was added, and the mixture was stirred at 70° C. for 6.5 h, washed, and dried to obtain olefinated silica microspheres;

[0053] S2: Under N2 protection, 7.5 g of olefinated silica microspheres were added to 75 g of anhydrous ethanol, and then 1 g of RH-222-4 was added dropwise at 40 ° C and 100 rpm for 40 min. After the addition was completed, the mixture was reacted at 70 ° C and 100 rpm for 3 h, washed, and dried to obtain a core-shell structure modifier;

[0054] S3: weigh 125 g nylon 6, 20 g EXL1414T, 5 g dimethyl silicone oil, 10 g core-shell structure modifier, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0055] S4: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0056] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0057] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the extruder feed port to the die head is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 250r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0058] Example 5

[0059] S1: 7.5 g of silica microspheres were dispersed in a mixed solution of 7.5 g of anhydrous ethanol and 75 g of water, and then 0.1 g of vinyl tri(β-methoxyethoxy)silane was added, and the mixture was stirred at 70° C. for 6.5 h, washed, and dried to obtain olefinated silica microspheres;

[0060] S2: Under N2 protection, 7.5 g of olefinated silica microspheres were added to 75 g of anhydrous ethanol, and then 3 g of RH-222-4 was added dropwise at 40 ° C and 100 rpm for 40 min. After the addition was completed, the mixture was reacted at 70 ° C and 100 rpm for 3 h, washed, and dried to obtain a core-shell structure modifier;

[0061] S3: weigh 125 g nylon 6, 40 g EXL1414T, 9 g dimethyl silicone oil, 15 g core-shell structure modifier, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0062] S4: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0063] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0064] S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the extruder feed port to the die head is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 250r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0065] Comparative Example 1

[0066] S1: weigh 125 g nylon 6, 30 g EXL1414T, 7 g dimethyl silicone oil, 12.5 g silica microspheres, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0067] S2: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0068] S3: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0069] S4: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the feed port to the die of the extruder is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 250r / min, water-cooled pelletizing is performed, and the core-shell structure modified nylon plastic is obtained after packaging.

[0070] Comparative Example 2

[0071] S1: Same as Example 2;

[0072] S2: Same as Example 2;

[0073] S3: weigh 155 g nylon 6, 7 g dimethyl silicone oil, 12.5 g core-shell structure modifier, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0074] S4: drying nylon 6 in a vacuum oven at 100° C. for 1.5 h to obtain a pretreated resin;

[0075] S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0076] S6: Same as Example 2.

[0077] Comparative Example 3

[0078] S1: Same as Example 2;

[0079] S2: Same as Example 2;

[0080] S3: weigh 125 g nylon 6, 30 g EXL1414T, 12.5 g core-shell structure modifier, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0081] S4: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0082] S5: adding the pretreated resin and the core-shell structure modifier into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0083] S6: Same as Example 2.

[0084] Comparative Example 4

[0085] S1: Same as Example 2;

[0086] S2: Same as Example 2;

[0087] S3: weigh 125 g nylon 6, 30 g EXL1414T, 7 g dimethyl silicone oil, 0.75 g benzoyl peroxide, 0.6 g polyethylene glycol and 0.3 g stearamide for later use;

[0088] S4: drying nylon 6 and EXL1414T in a vacuum oven at 100°C for 1.5 hours to obtain a pretreated resin;

[0089] S5: adding the pretreated resin and dimethyl silicone oil into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding a vulcanizing agent and a dispersant, and continuing to stir and mix for 40 minutes to obtain a mixture;

[0090] S6: Same as Example 2.

[0091] Comparative Example 5

[0092] S1: Same as Example 2;

[0093] S2: Same as Example 2;

[0094] S3: weigh 155 g of nylon 6, 12.5 g of core-shell structure modifier, 0.75 g of benzoyl peroxide, 0.6 g of polyethylene glycol and 0.3 g of stearamide for later use;

[0095] S4: drying nylon 6 in a vacuum oven at 100° C. for 1.5 h to obtain a pretreated resin;

[0096] S5: adding the pretreated resin and the core-shell structure modifier into a mixer, stirring and mixing for 1.5 hours at a stirring rate of 1000 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 40 minutes to obtain a mixture;

[0097] S6: Same as Example 2.

[0098] Performance Testing

[0099] The tensile strength and elongation at break of Examples 1-5 and Comparative Examples 1-5 were tested according to ISO-527 / 2, the impact strength was tested according to ISO-180, and the flexural strength and flexural modulus were tested according to ISO-178. The results are shown in the following table.

[0100]

[0101] Data analysis: It can be seen from Examples 1-5 that the core-shell structure modified nylon plastic prepared by the present invention has excellent mechanical properties. It can be seen from Example 2 and Comparative Example 1 that the construction of the core-shell structure plays a dominant role in the mechanical properties of nylon plastic. It can be seen from Example 2 and Comparative Examples 2-5 that silicon copolymer polycarbonate, dimethyl silicone oil and core-shell structure modifier synergistically promote the improvement of the mechanical properties of nylon plastic.

[0102] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0103] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A core-shell structure modified nylon plastic, characterized in that: The invention comprises the following raw materials in parts by weight: 100-150 parts of nylon, 20-40 parts of silicon copolymer polycarbonate, 5-9 parts of dimethyl silicone oil, 10-15 parts of core-shell structure modifier, 0.5-1 parts of vulcanizing agent and 0.5-1.5 parts of dispersant; The core-shell structure modifier is a core-shell structure with olefinic silica microspheres as core and single-ended hydrogen-containing silicone oil as shell, wherein the olefinic silica microspheres are obtained by grafting vinyl tris(β-methoxyethoxy) silane onto silica microspheres; The specific preparation method of the core-shell structure modifier is as follows: S1: dispersing silica microspheres in a mixed solution of anhydrous ethanol and water, then adding vinyl tri(β-methoxyethoxy)silane, stirring and reacting at 60-80° C. for 5-8 hours, washing, and drying to obtain olefinated silica microspheres; S2: under N2 protection, olefinated silica microspheres are added to anhydrous ethanol, and then single-terminal hydrogenated silicone oil is added dropwise at 30-50°C and 80-120rpm for 30-45min. After the addition is completed, the mixture is reacted at 60-80°C and 80-120rpm for 2-4h, washed, and dried to obtain a core-shell structure modifier; In the step S1, the weight ratio of silica microspheres, anhydrous ethanol, water and vinyl tris(β-methoxyethoxy)silane is 5-10:5-10:50-100:0.05-0.1; In the step S2, the weight ratio of olefinated silica microspheres, anhydrous ethanol and single-ended hydrogen-containing silicone oil is 5-10:50-100:1-3.

2. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The nylon is a mixture of one or more of nylon 6, nylon 66, nylon 610, nylon 1010, nylon 11, nylon 12, nylon 9T or nylon 12T.

3. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The model of the silicon copolymer polycarbonate is EXL1414T.

4. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The average molecular weight of the dimethyl silicone oil is 5000-10000.

5. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The vulcanizing agent is one of benzoyl peroxide, 2,4-dichlorobenzoyl peroxide or tert-butyl perbenzoate; the dispersant is a mixture of polyethylene glycol and stearamide in a weight ratio of 1-3:

1.

6. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The single-ended hydrogen-containing silicone oil has a model of RH-222-4 or RH-222-10.

7. The core-shell structure modified nylon plastic according to claim 1, characterized in that: The average diameter of the silica microspheres is 150-250 nm.

8. The method for preparing the core-shell structure modified nylon plastic according to any one of claims 1 to 7, characterized in that: The specific preparation method is as follows: S3: weigh 100-150 parts of nylon, 20-40 parts of silicon copolymer polycarbonate, 5-9 parts of dimethyl silicone oil, 10-15 parts of core-shell structure modifier, 0.5-1 part of vulcanizing agent and 0.5-1.5 parts of dispersant according to weight parts for later use; S4: drying the nylon and silicon copolymer polycarbonate in a vacuum oven at a temperature of 90-120° C. for 1-2 hours to obtain a pretreated resin; S5: adding the pretreated resin, the core-shell structure modifier and the dimethyl silicone oil into a mixer, stirring and mixing for 1-2 hours at a stirring rate of 800-1200 r / min, then adding the vulcanizing agent and the dispersant and continuing to stir and mix for 30-50 minutes to obtain a mixture; S6: adding the mixed material into a twin-screw extruder for melt extrusion, the temperature from the feed port to the die of the extruder is 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, the screw speed is 200-300r / min, water-cooling and pelletizing, and the core-shell structure modified nylon plastic is obtained after packaging.

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