Low-temperature toughened modified nylon 6 composite material and preparation method thereof

Abstract

The application provides a low-temperature toughening modified nylon 6 composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 40-70 parts of polyamide 6, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of ethylene-vinyl acetate copolymer grafted maleic anhydride, 8-15 parts of glycerol, 1-3 parts of inorganic nanomaterial, 0.5-2 parts of chain extender, 0.1-0.4 parts of antioxidant, and 0.1-0.4 parts of light-resistant agent. The formula is adjusted in a targeted manner, the chain extender is added, the molecular weight of PA6 is increased, the entanglement between molecular chains is increased, and therefore the mechanical properties of the composite material are significantly improved. Further, the inorganic nanomaterial is added, the crystallinity is increased, and the high and low temperature resistance and tensile strength of the composite material are significantly increased. Through the synergistic effect between the components, the low-temperature resistance of the composite material is good, and the low-temperature toughness is significantly improved. In addition, the selected materials are simple and easy to obtain, and the cost is low, and the cost of the composite material is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high molecular materials, in particular to a low-temperature toughening modified nylon 6 composite material and a preparation method thereof. BACKGROUND

[0002] Nylon 6 has excellent mechanical properties, electrical properties, wear resistance, chemical resistance, lubricity, but also has prominent shortcomings, such as brittle fracture under low-temperature notch conditions, which affects its application in some fields, such as outdoor use of railway equipment, automobile parts, etc.

[0003] At present, the common way to toughen nylon 6 is to add a large amount of elastomer, rubber and tough resin, such as POE, SBS, etc., to nylon 6, but due to the relatively high price of such elastomers, a large amount of addition also leads to a sharp increase in production cost. In addition, the ordinary toughened nylon 6 also has the disadvantages of poor resin flowability after modification, easy sticking to the mold, and difficult molding and demolding. And in extremely cold weather, the brittle temperature of ordinary toughened nylon 6 is still high, which cannot meet the actual use requirements of cold resistance and toughness, so the toughening system needs to be adjusted accordingly. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a low-temperature toughening modified nylon 6 composite material, which is used to solve the problems of poor low-temperature toughness of nylon 6 material and high modification cost in the prior art, and the present application also provides a preparation method of the low-temperature toughening modified nylon 6 composite material.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides the following technical solutions:

[0006] In a first aspect of the present application, a low-temperature toughening modified nylon 6 composite material is provided, which comprises the following components by weight: polyamide 6 (nylon 6, PA6) 40-70 parts, ethylene-vinyl acetate copolymer (EVA) 20-30 parts, ethylene-vinyl acetate copolymer grafted maleic anhydride (EVA-g-MAH) 10-20 parts, glycerol (glycerol, GL) 8-15 parts, inorganic nano-material 1-3 parts, chain extender 0.5-2 parts, antioxidant 0.1-0.4 parts, and light-resistant agent 0.1-0.4 parts.

[0007] In order to improve the low-temperature toughness of the PA6 / EVA matrix, glycerol is added to the matrix, the glycerol contains a large number of hydroxyl groups, can form more hydrogen bonds with PA6, and increase the internal interaction force; and the flowability of glycerol is excellent, so that the components are uniformly dispersed. Therefore, the appropriate addition of glycerol can improve the elongation at break and impact strength of the matrix, and reduce the Shore D hardness, and can improve the flowability of the matrix, so that it is not easy to stick to the mold, and easy to demold. Preferably, the optimal addition amount of glycerol is 4wt% of the total amount of the composite material.

[0008] The application also adds an appropriate amount of compatibilizer EVA-g-MAH to the composite material, one end of the molecular chain of EVA-g-MAH contains a polar anhydride group, which can form interaction with the hydroxyl, amino, siloxane bond, etc. in PA6, glycerol and inorganic nanomaterials, and the EVA structure at the other end of EVA-g-MAH has good interaction with EVA resin. Therefore, EVA-g-MAH forms an effective interface layer between PA6, EVA, glycerol and inorganic nanomaterials, improves the adhesion and interaction between the components, thereby improving the elongation at break and notched impact strength of the composite material; however, the addition of EVA-g-MAH will sacrifice part of the tensile strength of the matrix.

[0009] Further, in order to recover the tensile strength sacrificed by the addition of EVA-g-MAH, the application also adds inorganic nanomaterials to the composite material. By adding inorganic nanomaterials, the crystallinity of the composite material can be increased, the high and low temperature resistance and tensile strength of the composite material can be significantly increased, and the ductility of the composite material is hardly affected, and the elongation at break of the composite material is almost not reduced. The optimal addition amount of inorganic nanomaterials is 1.5wt% of the total amount of the composite material.

[0010] The inorganic nanomaterials include halogenated iron nanotubes, which are obtained by impregnation method from halloysite nanotubes. Specifically, the halogenated iron nanotubes include ferric chloride nanotubes (HNT-FeCl3), and the preparation method of the HNT-FeCl3 includes the following steps: weighing halloysite nanotubes, dissolving in anhydrous ethanol, ultrasonic dispersion, adding ferric chloride hexahydrate, continuing ultrasonic dispersion, and then drying the thick paste into powder to obtain HNT-FeCl3. The mass ratio of the halloysite nanotubes to the ferric chloride hexahydrate is 2:1.

[0011] Further, the application adds a chain extender, which can react with both the terminal amino group and the terminal carboxyl group of PA6 in the melt processing process, so as to increase the molecular weight of PA6, thereby significantly improving the mechanical properties of PA6, especially the notched impact strength and elongation at break.

[0012] Preferably, the chain extender is an organic silicon epoxy compound, and its chemical formula is: The organic silicon epoxy compound is prepared by the reaction of dimethyl chlorosilane, methyl trimethoxysilane and allyl glycidyl ether, and the reaction process is as follows:

[0013] .

[0014] Specifically, the preparation method of the organic silicon epoxy compound comprises the following steps:

[0015] a. Methyl trimethoxysilane is added into an appropriate amount of aqueous ethanol solution, and dimethyl chlorosilane is added dropwise during stirring, and then the mixture is continuously stirred to fully react;

[0016] b. The reacted solution is separated, and the separated organic silicon layer is washed with deionized water and saturated sodium chloride solution respectively to obtain an intermediate product;

[0017] c. Allyl glycidyl ether and a catalyst are added into an appropriate amount of toluene solution, and the mixture is heated to 60°C and fully stirred, and then the intermediate product is added dropwise during stirring, and the mixture is heated to 80°C after the dropwise addition is completed, and then the mixture is continuously stirred to fully react;

[0018] d. After the reaction is completed, the solvent is removed by suction filtration, and the product is dried at 60°C to obtain a final product, i.e. the organic silicon epoxy compound.

[0019] In step a, the molar ratio of methyl trimethoxysilane to dimethyl chlorosilane is 1: (3-5), preferably 1:4; and the concentration of the aqueous ethanol solution is 40wt%.

[0020] In step c, the molar ratio of the intermediate product to allyl glycidyl ether is 1: (3-5), preferably 1:4; and the catalyst is chloroplatinic acid isopropanol solution.

[0021] The organic silicon epoxy compound reacts with the terminal groups of the PA6 molecular chain, couples them, reconnects the originally broken molecular chain, and increases the molecular weight of PA6; the long branched chain structure of the organic silicon epoxy compound increases the entanglement between PA6 molecular chains, thereby increasing the interaction between PA6 molecular chains, which is beneficial to the transmission of internal stress of the matrix; at the same time, due to the introduction of the flexible organic silicon segment, the stress dissipation capacity is improved, which can significantly improve the notched impact strength and elongation at break of the matrix, and can also improve the tensile strength and bending strength of PA6, so as to achieve the purpose of toughening. In addition, the chain-extended PA6 is not easy to stick to the mold, which ensures the comprehensive performance of PA6. Preferably, the addition amount of the organic silicon epoxy compound is 1% to 2% of the addition amount of PA6, and more preferably, the addition amount of the organic silicon epoxy compound is 2% of the addition amount of PA6.

[0022] Further, the relative viscosity of the PA6 is 2.0 dl / g~2.8 dl / g.

[0023] Further, the content of vinyl acetate in the ethylene-vinyl acetate copolymer (EVA) is 22%~30%.

[0024] Further, the melt index of the ethylene-vinyl acetate copolymer grafted with maleic anhydride (EVA-g-MAH) is 2~5 g / 10min.

[0025] Further, the antioxidant is a mixture of one or more of phenolic antioxidant, amine antioxidant, phosphite complex antioxidant.

[0026] Further, the light-resistant agent is a phenolic antioxidant, a phosphite, a hindered amine or other ultraviolet absorber.

[0027] In a second aspect of the present application, a preparation method of a low-temperature toughened modified nylon 6 composite material is provided, comprising the following steps:

[0028] S1, the polyamide 6, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer grafted with maleic anhydride, glycerol, inorganic nanomaterial, chain extender, antioxidant and light-resistant agent are weighed according to the proportion, and are put into a high-speed mixer for fully blending to obtain a premix;

[0029] S2, the obtained premix is fed into a double screw extruder for melt extrusion;

[0030] S3, the extruded melt material is drawn, cooled and granulated to obtain a low-temperature toughened modified nylon 6 composite material.

[0031] Further, in step S1, the mixing time is 5~15min, preferably 10min.

[0032] Further, in step S2, the temperature of each zone of the screw extruder is 230℃~250℃, and the screw rotation speed is 250~600r / min.

[0033] The low-temperature toughened modified nylon 6 composite material and the preparation method thereof have the following beneficial effects: the glycerol and the EVA-g-MAH are added on the basis of the PA6 / EVA matrix, the elongation at break and the notched impact strength of the composite material are significantly improved, the chain extender is further added, the molecular weight of the PA6 is increased, the entanglement between the molecular chains is increased, and the mechanical properties of the composite material are significantly improved, the inorganic nanomaterial is further added, the crystallinity is increased, and the high and low temperature resistance and the tensile strength of the composite material are significantly increased. Through the synergistic effect between the components, the low-temperature resistance of the composite material is good, the low-temperature toughness is significantly improved, the materials are simple and easy to obtain, the cost is low, the use of the toughening agent is reduced, the cost of the composite material is effectively reduced, the advantages of the raw materials are retained, the melt index is not too low, and the subsequent injection molding is facilitated. In addition, the preparation method of the present application is melt blending, the steps are less, the process is simple, and the production is facilitated. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0035] Example 1

[0036] A kind of ferric trichloride nanotube (HNT-FeCl3), the preparation method of the HNT-FeCl3 includes the following steps: weighing 2.5g halloysite nanotube is dissolved in 5ml anhydrous ethanol, ultrasonic dispersion 10min, 1.25g ferric trichloride hexahydrate is added, and ultrasonic dispersion continues 10min, then the thick slurry is dried into powder, and HNT-FeCl3 is obtained.

[0037] Example 2

[0038] A kind of chain extender, the preparation method of the chain extender includes the following steps:

[0039] a, 1.2g methyl trimethoxysilane is added to a suitable amount of 5g ethanol aqueous solution with a concentration of 40wt%, and is fully stirred for 30min under ice bath, 4.4g dimethyl chlorosilane is added dropwise during stirring, and is continuously stirred for 90min under ice bath to make it fully react;

[0040] b, the solution after reaction is separated using a separatory funnel, the obtained silicone layer is washed with deionized water twice, and then washed with saturated sodium chloride solution twice to obtain 3.8g of intermediate product;

[0041] c. 1.2 g of allyl glycidyl ether and 0.1 g of chloroplatinic acid in isopropanol solution were added to an appropriate amount of 15 ml of toluene solution, heated to 60°C and stirred thoroughly for 60 min, 0.7 g of the intermediate product was added dropwise during stirring, after the dropwise addition was completed, the temperature was raised to 80°C, and stirring was continued to allow it to react thoroughly;

[0042] d. After the reaction was completed, the solvent was removed by suction filtration, and the product was dried at 60°C to obtain 1.3 g of the final product, i.e., the silicone epoxy compound.

[0043] Example 3

[0044] A nylon 6 composite material, the preparation method comprising the following steps:

[0045] S1. 64 parts of PA6, 27 parts of EVA, 9 parts of EVA-g-MAH, 0.1 part of antioxidant and 0.2 part of light resistance agent were weighed and put into a high-speed mixer for thorough blending for 10 min to obtain a premix;

[0046] S2. The obtained premix was fed into a twin-screw extruder for melt extrusion, and the temperature of each zone of the screw extruder was 245°C, and the screw rotation speed was 500 r / min;

[0047] S3. The extruded melt material was subjected to a draw bar, cooling and pelletizing to obtain a nylon 6 composite material.

[0048] Example 4

[0049] A nylon 6 composite material, the preparation method comprising the following steps:

[0050] S1. 61 parts of PA6, 26 parts of EVA, 13 parts of EVA-g-MAH, 0.1 part of antioxidant and 0.2 part of light resistance agent were weighed and put into a high-speed mixer for thorough blending for 10 min to obtain a premix;

[0051] S2. The obtained premix was fed into a twin-screw extruder for melt extrusion, and the temperature of each zone of the screw extruder was 245°C, and the screw rotation speed was 500 r / min;

[0052] S3. The extruded melt material was subjected to a draw bar, cooling and pelletizing to obtain a nylon 6 composite material.

[0053] Example 5

[0054] A nylon 6 composite material, the preparation method comprising the following steps:

[0055] S1. 58 parts of PA6, 26 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 0.1 part of antioxidant and 0.2 part of light resistance agent were weighed and put into a high-speed mixer for thorough blending for 10 min to obtain a premix;

[0056] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 245°C, and the screw rotation speed is 500 r / min;

[0057] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a nylon 6 composite material.

[0058] Example 6

[0059] A nylon 6 composite material, a preparation method thereof comprises the following steps:

[0060] S1, 55 parts of PA6, 24 parts of EVA, 12 parts of EVA-g-MAH, 9 parts of pure glycerol, 0.1 part of antioxidant and 0.2 part of light resistance agent are weighed and put into a high-speed mixer for fully blending for 10 min to obtain a premix;

[0061] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 245°C, and the screw rotation speed is 500 r / min;

[0062] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a nylon 6 composite material.

[0063] Example 7

[0064] A nylon 6 composite material, a preparation method thereof comprises the following steps:

[0065] S1, 57 parts of PA6, 25 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 1.5 parts of HNT-FeCl3, 0.1 part of antioxidant and 0.2 part of light resistance agent are weighed and put into a high-speed mixer for fully blending for 10 min to obtain a premix;

[0066] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 250°C, and the screw rotation speed is 500 r / min;

[0067] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a nylon 6 composite material.

[0068] Example 8

[0069] A nylon 6 composite material, a preparation method thereof comprises the following steps:

[0070] S1, 57 parts of PA6, 24 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 3 parts of HNT-FeCl3, 0.1 part of antioxidant and 0.2 part of light resistance agent are weighed and put into a high-speed mixer for fully blending for 10 min to obtain a premix;

[0071] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 250℃, and the screw rotation speed is 500 r / min;

[0072] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a nylon 6 composite material.

[0073] Example 9

[0074] A low-temperature toughened modified nylon 6 composite material, a preparation method thereof comprises the following steps:

[0075] S1, 57 parts of PA6, 25 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 1.5 parts of HNT-FeCl3, 0.5 parts of the chain extender prepared in Example 2, 0.1 parts of an antioxidant and 0.2 parts of a light stabilizer are weighed and put into a high-speed mixer for fully blending for 10 minutes to obtain a premix;

[0076] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 248℃, and the screw rotation speed is 550 r / min;

[0077] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a low-temperature toughened modified nylon 6 composite material.

[0078] Example 10

[0079] A low-temperature toughened modified nylon 6 composite material, a preparation method thereof comprises the following steps:

[0080] S1, 57 parts of PA6, 25 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 1.5 parts of HNT-FeCl3, 0.5 parts of the chain extender prepared in Example 2, 0.1 parts of an antioxidant and 0.2 parts of a light stabilizer are weighed and put into a high-speed mixer for fully blending for 10 minutes to obtain a premix;

[0081] S2, the obtained premix is fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder is 248℃, and the screw rotation speed is 550 r / min;

[0082] S3, the extruded melt-state material is subjected to drawing, cooling and granulation to obtain a low-temperature toughened modified nylon 6 composite material.

[0083] Example 11

[0084] A low-temperature toughened modified nylon 6 composite material, a preparation method thereof comprises the following steps:

[0085] S1, 57 parts of PA6, 23 parts of EVA, 12 parts of EVA-g-MAH, 4 parts of pure glycerol, 1.5 parts of HNT-FeCl3, 2 parts of the chain extender prepared in Example 2, 0.1 part of antioxidant and 0.2 part of light stabilizer were weighed and put into a high-speed mixer for fully blending for 10 minutes to obtain a premix;

[0086] S2, the obtained premix was fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder was 248℃, and the screw rotation speed was 550 r / min;

[0087] S3, the extruded melt material was subjected to drawing, cooling and granulation to obtain a low-temperature toughened modified nylon 6 composite material.

[0088] Comparative Example 1

[0089] A PA6 / EVA composite material, the preparation method thereof comprises the following steps:

[0090] S1, 80 parts of PA6, 20 parts of EVA, 0.1 part of antioxidant and 0.2 part of light stabilizer were weighed and put into a high-speed mixer for fully blending for 10 minutes to obtain a premix;

[0091] S2, the obtained premix was fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder was 248℃, and the screw rotation speed was 500 r / min;

[0092] S3, the extruded melt material was subjected to drawing, cooling and granulation to obtain a PA6 / EVA composite material.

[0093] Comparative Example 2

[0094] A PA6 / EVA composite material, the preparation method thereof comprises the following steps:

[0095] S1, 70 parts of PA6, 30 parts of EVA, 0.1 part of antioxidant and 0.2 part of light stabilizer were weighed and put into a high-speed mixer for fully blending for 10 minutes to obtain a premix;

[0096] S2, the obtained premix was fed into a twin-screw extruder for melt extrusion, the temperature of each zone of the screw extruder was 248℃, and the screw rotation speed was 500 r / min;

[0097] S3, the extruded melt material was subjected to drawing, cooling and granulation to obtain a PA6 / EVA composite material.

[0098] The components and weight ratio of each part of Examples 3-11 and Comparative Examples 1-2 are shown in Table 1.

[0099] Table 1, the components and weight ratio of each part of Examples 3-11 and Comparative Examples 1-2

[0100]

[0101] The composite materials prepared in Examples 3-11 and Comparative Examples 1-2 were injection molded by an injection molding machine to obtain corresponding test bars, and the test bars were subjected to performance testing, wherein the tensile properties were tested according to ISO527, the Shore D hardness was tested according to GB / T1172-2017, and the Charpy notched impact strength was tested according to ISO179, and the specific test results are shown in Table 2.

[0102] Table 2, test results of Examples 3-11 and Comparative Examples 1-2

[0103]

[0104] From the comparative analysis of the data of Examples 3-4 and Comparative Examples 1-2, it can be seen that the addition of EVA-g-MAH in the PA6 / EVA matrix can increase the elongation at break and the Charpy notched impact strength, and reduce the tensile strength and the Shore D hardness, and the more the amount added, the more obvious the effect. From the comparative analysis of the data of Examples 3-4 and Examples 5-6, it can be seen that the addition of glycerol in the PA6 / EVA matrix can significantly increase the elongation at break and the notched impact strength, slightly increase the tensile strength, but reduce the Shore D hardness, and the optimum addition amount of glycerol is 4%. From the comparative analysis of the data of Examples 7-8 and Example 5, it can be seen that the continuous addition of inorganic nano material HNT-FeCl3 can significantly increase the tensile strength, slightly increase the notched impact strength and the Shore D hardness, and has little effect on the elongation at break, and the optimum addition amount of HNT-FeCl3 is 1.5%. From the comparative analysis of the data of Examples 9-11 and Example 7, it can be seen that the low-temperature toughened and modified nylon 6 composite material of the present application obviously improves the elongation at break, the tensile strength and the notched impact strength by continuously adding a chain extender, and the synergistic effect between the components greatly improves the comprehensive performance of the material; among them, the effect of the addition amount of the chain extender being 1.1% is the best, which is equivalent to 2% of the addition amount of PA6, at this time the chain extension effect on PA6 is the best.

[0105] In summary, the application adds glycerol and EVA-g-MAH on the basis of PA6 / EVA matrix, significantly improves the elongation at break and notched impact strength of the composite material; and adds a chain extender to improve the molecular weight of PA6, increase the entanglement between molecular chains, thereby significantly improving the mechanical properties of the composite material; further adding inorganic nanomaterials increases the crystallinity, significantly increases the high and low temperature resistance and tensile strength of the composite material. Through the synergistic effect between the components, the low temperature resistance of the composite material is good, and the low temperature toughness is significantly improved; and the selected materials are simple and easy to obtain, and the cost is low, which effectively reduces the cost of the composite material. At the same time, the application adopts a melt blending preparation method, the steps are less, the process is simple, and the production is convenient. Therefore, the application effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0106] The above examples only illustrate the principles and effects of the application, and are not intended to limit the application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea disclosed by the application should be covered by the claims of the application.

Claims

1. A low temperature toughened modified nylon 6 composite material, characterized in that, The components include the following weight parts: nylon 640~70 parts, ethylene-vinyl acetate copolymer 20~30 parts, ethylene-vinyl acetate copolymer grafted maleic anhydride 10~20 parts, glycerol 4 parts, inorganic nanomaterial 1.5~3 parts, chain extender 0.5~2 parts, antioxidant 0.1~0.4 parts, light-resistant agent 0.1~0.4 parts; The preparation method of the inorganic nanomaterial comprises the following steps: weighing halloysite nanotubes, dissolving in anhydrous ethanol, ultrasonic dispersion, adding iron trichloride hexahydrate, continuing ultrasonic dispersion, and then drying the concentrated slurry into powder to obtain HNT-FeCl3; wherein the mass ratio of the halloysite nanotubes and the iron trichloride hexahydrate is 2:

1.

2. The cryogenically toughened modified nylon 6 composite of claim 1, wherein, The chain extender is an organosilicon epoxy compound, and the organosilicon epoxy compound is prepared by reacting dimethylchlorosilane, methyltrimethoxysilane and allyl glycidyl ether.

3. A cryogenically toughened modified nylon 6 composite according to claim 2, wherein, The preparation method of the organosilicon epoxy compound comprises the following steps: a. adding methyltrimethoxysilane into an appropriate amount of aqueous ethanol solution, fully stirring, and adding dimethylchlorosilane dropwise during stirring to fully react; b. separating the reacted solution, and washing the separated organosilicon layer with deionized water and saturated sodium chloride solution to obtain an intermediate product; c. adding allyl glycidyl ether and a catalyst into an appropriate amount of toluene solution, heating to 60°C and fully stirring, adding the intermediate product dropwise during stirring, heating to 80°C after dropwise addition is completed, and continuing to stir to fully react; d. after the reaction is completed, removing the solvent by suction filtration, drying the product at 60°C, and obtaining the final product, i.e. the organosilicon epoxy compound.

4. The cryogenically toughened modified nylon 6 composite of claim 3, wherein, In step a, the molar ratio of methyltrimethoxysilane and dimethylchlorosilane is 1:(3~5); in step c, the molar ratio of the intermediate product and allyl glycidyl ether is 1:(3~5); and the catalyst is chloroplatinic acid isopropanol solution.

5. The cryogenically toughened modified nylon 6 composite of claim 1, wherein, The relative viscosity of the nylon 6 is 2.0 dl / g~2.8 dl / g.

6. The cryogenically toughened modified nylon 6 composite of claim 1, wherein, The antioxidant is one or more of a phenolic antioxidant, an amine antioxidant and a phosphite antioxidant.

7. The method of claim 1 to 6, wherein the method is characterized by, The method comprises the following steps: S1. weighing nylon 6, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer grafted maleic anhydride, glycerol, inorganic nanomaterial, chain extender, antioxidant and light-resistant agent according to proportions, and feeding them into a high-speed mixer to fully blend to obtain a premix; S2. feeding the obtained premix into a twin-screw extruder to melt extrude; S3. the extruded melt passes through a drawbench, cools and is pelletized to obtain a low-temperature toughened modified nylon 6 composite material.

8. The method for preparing a low-temperature toughened modified nylon 6 composite material according to claim 7, characterized in that, In step S2, the temperature of each zone of the screw extruder is 230°C~250°C, and the screw rotation speed is 250~600 r / min.

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