Toughened antistatic polyamide composite material and preparation method thereof

Abstract

The invention belongs to the technical field of polymer composite materials, and particularly relates to a toughened antistatic polyamide composite material and a preparation method thereof. The toughened antistatic polyamide composite material disclosed by the invention is prepared from the following components in parts by weight: 100 parts of polyamide resin, 10 to 40 parts of a toughened antistatic agent, 1 to 10 parts of a plasticizer and 0.05 to 0.5 part of an antioxidant, the polyamide resin is obtained by polymerizing aliphatic diacid and aliphatic diamine, and the number of carbon atoms of the aliphatic diacid and the aliphatic diamine is greater than or equal to 6. When the toughened antistatic polyamide composite material is prepared, a copolymerized polyether amide elastomer is used as an antistatic agent, and a conductive network structure can be formed in a matrix. The polyamide composite material prepared by the invention has good toughness and antistatic property, and can be used in the fields of toughening materials requiring excellent antistatic property, such as aerospace, automobiles, electrical equipment, mechanical structures, traffic equipment, textiles, papermaking machinery and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer composite materials, and particularly relates to a toughened antistatic polyamide composite material and a preparation method thereof. Background Art

[0002] Polyamide refers to a polymer with amide repeating units in the polymer chain. It has high rigidity, good toughness and good heat deformation temperature, and its formability and chemical resistance are relatively good. Therefore, it has been widely used in aerospace, automobiles, electrical equipment, mechanical parts, transportation equipment, textiles, papermaking machinery and other fields.

[0003] Polyamide is an organic non-metallic material and an electrical insulating material. Its surface resistivity is generally around 10 13 -10 15 Ω·cm, with a high resistivity, it is easy to accumulate static electricity during use, which will not only affect the apparent performance, use performance and processing performance of the material, but also may cause safety accidents such as explosion and fire in more serious cases.

[0004] Antistatic agents are usually added to polyamide to reduce the surface resistance of polyamide and make it exhibit antistatic function. Currently, there are two main types of antistatic agents on the market: surfactant type and polymer permanent type.

[0005] Invention patent CN106867249B discloses an enhanced antistatic polyamide composite material and a preparation method thereof. The patent adds an antistatic agent by a blending method to improve the antistatic performance of the polyamide material. The added antistatic agent includes one or more of anionic antistatic agents, nonionic antistatic agents and polymer structure antistatic agents. Anionic antistatic agents include: sodium allyl sulfonate and / or monododecyloxy potassium phosphate. Nonionic antistatic agents include: one or more of coconut fatty acid diethylamide, mixed monostearate glycerol (GMS), a mixture of polyglycerol esters and molecular distilled monoglycerides (Grindsted PGE308), polyethylene glycol 400 phosphate and lauryl alcohol ether phosphate. Polymeric structure antistatic agents include: polyethylene glycol-lithium sol complex. This invention patent uses surfactant-type and polymer permanent compound antistatic agents. Although compound antistatic agents have excellent antistatic effects, the anionic or cationic surfactants in them rely on their precipitation on the hose surface to absorb moisture in the air to play an antistatic role. The antistatic effect of this antistatic agent is related to the use environment and is heavily dependent on the air humidity in the environment. The antistatic effect is good in a humid environment and poor in a dry environment, and the environmental humidity requirements are high. In addition, as the use time increases, the surfactant is prone to molecular migration, and the gradual loss of the surfactant leads to a gradual weakening of the antistatic property, causing the material to be unable to maintain antistatic properties for a long time.

[0006] Invention patent CN114163814B discloses an antistatic long-chain polyamide composition and a preparation method thereof. The method uses a modified polyether block amide as an antistatic agent. The modified polyether block amide is a polyether block amide with polyamide as a hard segment and polyether as a soft segment, and the polyether block amide is modified by a chain extender; the chain extender is a copolymer containing an epoxy functional group. This invention patent uses modified polyether block amide as an antistatic agent. Since its molecular chain contains polyamide blocks, it can achieve molecular compatibility with the long-chain polyamide matrix resin after being blended with the long-chain polyamide resin. The polyether block amide molecular chain has strong mobility, which facilitates the movement of protons between molecules, and conducts and releases the generated static charge through ion conduction. In addition, the polyether block amide antistatic agent is distributed in a fine layer or tendon shape on the surface of the polyamide composition, forming a conductive surface layer, and is almost spherical in the center, which is used as a path to leak static charge, so as to reduce the volume resistivity of the material to achieve the antistatic effect. It does not completely rely on surface water absorption, and is less affected by the humidity of the environment, and can ensure the stable antistatic performance of the long-chain polyamide composition for a long time. This invention uses a copolymer containing epoxy functional groups to extend the chain of polyether block amide, increase viscosity, and improve extrusion processing performance, but the branched structure formed by the epoxy functional group is easy to affect the mechanical properties of the material, and in severe cases, gel may be produced, which cannot be processed normally. Summary of the invention

[0007] In view of the above technical problems and the shortcomings in the art, the present invention provides a toughened antistatic polyamide composite material and a preparation method thereof. The polyamide composite material prepared by the present invention has good toughness and antistatic properties and can be used in aerospace, automobiles, electrical equipment, mechanical structures, transportation equipment, textiles, papermaking machinery and other toughened material fields that require excellent antistatic properties.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention is: In a first aspect, an embodiment of the present invention provides a toughened antistatic polyamide composite material, comprising the following components in parts by weight: Polyamide resin 100 parts Toughening antistatic agent 10-40 parts Plasticizer 1-10 parts Antioxidant 0.05-0.5 parts; The polyamide resin is obtained by polymerizing an aliphatic diacid and an aliphatic diamine, and the carbon number of the aliphatic diacid and the aliphatic diamine are both greater than or equal to 6.

[0009] Further, the aliphatic diacid includes one or more of adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedicarboxylic acid, hexadecanedioic acid, heptadecanedioic acid and octadecanedicarboxylic acid; The aliphatic diamine includes one or more of hexamethylenediamine, heptamethylenediamine, octanediamine, nonamethylenediamine, decanediamine, undecanediamine, dodecanediamine, tridecanediamine, tetradecanediamine, pentadecanediamine, hexadecanediamine, heptadecanediamine and octadecanediamine.

[0010] Furthermore, the toughening antistatic agent is a polyetheramide elastomer, the hard segment is polyamide 1012, and the soft segment is a hydrophilic polyether and a hydrophobic polyether; The hydrophilic polyether is polyoxyethylene ether diacid, and the number average molecular weight is 600-3000; The hydrophobic polyether is polytetrahydrofuran ether diacid, and the number average molecular weight is 600-3000.

[0011] Furthermore, the plasticizer is N-butylbenzenesulfonamide.

[0012] Furthermore, the antioxidant is one of antioxidant 168 and antioxidant 1098 or a mixture of both substances.

[0013] In a second aspect, an embodiment of the present invention provides a method for preparing the toughened antistatic polyamide composite material according to the first aspect, comprising the following steps: (1) Add 100 parts of dodecanedioic acid, 100-200 parts of decanediamine, 100-500 parts of hydrophilic polyether, 100-500 parts of hydrophobic polyether and 800-1500 parts of deionized water into a reaction kettle, start stirring, heat to 180-220°C, react for 2-8 hours at a pressure of 0.8-2.0 MPa, reduce the pressure to normal pressure, and raise the system temperature to 220-250°C, then evacuate the reaction kettle, reduce the absolute pressure of the reaction kettle to 500-2000 Pa, and react for 3-5 hours to obtain a toughening antistatic agent; (2) Add the polyamide resin, antioxidant and toughening antistatic agent obtained in step (1) into a high-speed mixer, and stir at 400 r / min for 5-10 minutes to completely mix the materials to obtain material A; (3) Add the mixed material A into the main hopper of the twin-screw extruder, feed the material into the twin-screw extruder through the main feed loss-in-weight scale, add plasticizer into the twin-screw extruder using a liquid loss-in-weight scale, and after all the materials are melt-mixed and uniformly mixed by the twin-screw, extrude, cool, granulate, dry, and package to obtain the final product.

[0014] Furthermore, under the conditions of a temperature of 230° C. and a pressure of 2.16 kg, the melt index of the toughening antistatic agent is 2-8 g / 10 min.

[0015] Furthermore, in step (3), the temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 170-230°C, the temperature of other zones is 200-280°C, the temperature of the die head is 180-260°C; and the main engine speed of the extruder is 100-600r / min.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention uses copolymerized polyetheramide elastomer as an antistatic agent when preparing toughened antistatic polyamide composite material. Since its molecular chain contains hydrophilic polyether segments, the ether oxygen atoms in the polyether segments have the function of transferring charges. Instead of relying on the antistatic agent to migrate to the surface to absorb water, a conductive network structure is formed inside the matrix to leak charges and reduce resistance. Compared with traditional antistatic agents, its antistatic effect is more durable, is not affected by air humidity, and is less susceptible to factors such as wiping and washing.

[0017] Although polyetheramide elastomers can be used as toughening agents for polyamides, the toughening effect of polyetheramide elastomers with hydrophilic polyether as soft segments is poor. The present invention finds that copolymerizing hydrophobic polyether segments on the basis of polyetheramide elastomers with hydrophilic polyether as soft segments can effectively improve the toughening effect. Since the molecular chain contains polyamide blocks, the compatibility with the base polyamide resin can be effectively improved during blending, avoiding the problem of decreased compatibility of mechanical properties due to compatibility issues when using polyolefin elastomers as toughening agents.

[0018] The present invention uses carboxyl-terminated polyether as raw material when synthesizing polyetheramide elastomer, and can obtain high-viscosity polyetheramide elastomer for toughening modification. The polymerization method is simple, and the defects of difficult polymerization and low molecular weight when using hydroxyl-terminated polyether and amino-terminated polyether are avoided.

[0019] The polyamide composite material prepared by the present invention has good toughness and antistatic properties and can be used in aerospace, automobiles, electrical equipment, mechanical structures, transportation equipment, textiles, papermaking machinery and other fields requiring toughening materials with excellent antistatic properties. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Example 1 A method for preparing a toughened antistatic polyamide composite material comprises the following steps: (1) 49.45 kg of polyoxyethylene ether diacid (number average molecular weight of 1978), 28.5 kg of polytetrahydrofuran ether diacid (number average molecular weight of 1140), 11.5 kg of dodecanedioic acid, 17.2 kg of deionized water and 120 kg of deionized water were added to a reactor, nitrogen was passed through and oxygen was removed twice, stirring was started, and the temperature was raised to 200°C. After reacting for 3 hours at a pressure of 1.5 MPa, the pressure was slowly reduced to normal pressure. At the same time, the temperature of the reactor was raised to 250°C, the reactor was evacuated, and the pressure of the polymerization reactor was reduced to 1000 Pa (absolute pressure). The reaction was carried out at 250°C and 1000 Pa, and the stirring current was monitored at the same time. When the stirring current was 9.1 A, the stirring was stopped. The reaction was carried out under vacuum for a total of 4 hours. The material was extruded, stretched, cooled and pelletized to obtain a toughening antistatic agent. The reaction was carried out at a temperature of 230°C and a pressure of 2.16 kg, the melt index of the toughening antistatic agent is 2.5g / 10min.

[0022] The toughening modification formula is as follows: 80 kg of polyamide 612, 4.8 kg of plasticizer N-butylbenzenesulfonamide, 20 kg of toughening antistatic agent, 40 g of antioxidant 168, and 120 g of antioxidant 1098.

[0023] (2) Add polyamide resin, antioxidant, toughening antistatic agent into a high-speed mixer and stir at 400 r / min for 8 minutes. After the materials are completely mixed, they are added to the twin-screw extruder at a uniform speed through a feeder. The plasticizer N-butylbenzenesulfonamide is added at a uniform speed through the liquid feeding port reserved in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the above-mentioned toughening modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated, and dried to obtain the finished product.

[0024] The temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 190°C, the temperature of other zones is 250°C, the temperature of the die head is 200°C; the main speed of the extruder is 400r / min.

[0025] Example 2 A method for preparing a toughened antistatic polyamide composite material comprises the following steps: (1) 30.24 kg of polyoxyethylene ether diacid (number average molecular weight of 1008), 34.2 kg of polytetrahydrofuran ether diacid (number average molecular weight of 1140), 13.8 kg of dodecanedioic acid, 20.64 kg of deionized water and 120 kg of deionized water were added to a reactor, nitrogen was passed through and oxygen was removed twice, stirring was started, and the temperature was raised to 192°C. After reacting for 5 hours at a pressure of 1.2 MPa, the pressure was slowly reduced to normal pressure. At the same time, the temperature of the reactor was raised to 240°C, the reactor was evacuated, and the pressure of the polymerization reactor was reduced to 2000 Pa (absolute pressure). The reaction was carried out at 240°C and 2000 Pa, and the stirring current was monitored at the same time. When the stirring current was 9.0 A, the stirring was stopped. The reaction was carried out under vacuum for a total of 3 hours. The material was extruded, stretched, cooled and pelletized to obtain a toughening antistatic agent. The material was heated to 230°C and 2.16 MPa. Under the condition of kg, the melt index of the toughening antistatic agent is 3.5g / 10min.

[0026] The toughening modification formula is as follows: 80 kg of polyamide 1012, 4 kg of plasticizer N-butylbenzenesulfonamide, 16 kg of toughening antistatic agent, 30 g of antioxidant 168, and 50 g of antioxidant 1098.

[0027] (2) Add polyamide 1012, antioxidant, toughening antistatic agent into a high-speed mixer according to the required ratio of the formula, stir at 400r / min for 8 minutes, and add them into a twin-screw extruder at a uniform speed through a feeder after the materials are completely mixed. The plasticizer is added at a uniform speed through the liquid feeding port reserved in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the toughening modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated, and dried to obtain the finished product.

[0028] The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of other zones was 230°C, the temperature of the die head was 190°C; the main speed of the extruder was 400r / min.

[0029] Example 3 A method for preparing a toughened antistatic polyamide composite material comprises the following steps: (1) 36.29 kg of polyoxyethylene ether diacid (number average molecular weight of 1008), 27.36 kg of polytetrahydrofuran ether diacid (number average molecular weight of 1140), 13.8 kg of dodecanedioic acid, 20.64 kg of deionized water and 120 kg of deionized water were added to a reactor, nitrogen was passed through the reactor to remove oxygen twice, stirring was started, the temperature was raised to 200°C, and the reaction was carried out at a pressure of 1.5 MPa for 3 hours. The pressure was then slowly reduced to normal pressure, and the temperature of the reactor was raised to 245°C. The reactor was evacuated and the pressure of the polymerization reactor was reduced to 1500 Pa (absolute pressure). The reaction was carried out at 245°C and 1500 Pa, and the stirring current was monitored. When the stirring current was 9.0 A, stirring was stopped. The reaction was carried out under vacuum for a total of 4 hours. The material was extruded, stretched, cooled and pelletized to obtain a toughened antistatic agent. The melt index of the toughened antistatic agent was 3.2 at a temperature of 230°C and a pressure of 2.16 kg. g / 10min.

[0030] The toughening modification formula is as follows: 80 kg of polyamide 1010, 4 kg of plasticizer N-butylbenzenesulfonamide, 17 kg of toughening antistatic agent, 40 g of antioxidant 168, and 60 g of antioxidant 1098.

[0031] (2) Add polyamide 1010, antioxidant, toughening antistatic agent in the required proportion to the high-speed mixer, stir at 400r / min for 8 minutes, and add the materials to the twin-screw extruder at a uniform speed through the feeder after they are completely mixed. The plasticizer is added at a uniform speed through the reserved liquid feeding port in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the toughening modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated, and dried to obtain the finished product.

[0032] The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of other zones was 235°C, the temperature of the die head was 190°C; the main speed of the extruder was 400r / min.

[0033] Example 4 A method for preparing a toughened antistatic polyamide composite material comprises the following steps: (1) 24.2 kg of polyoxyethylene ether diacid (number average molecular weight 1008), 41.1 kg of polytetrahydrofuran ether diacid (number average molecular weight 1140), 13.8 kg of dodecanedioic acid, 20.64 kg of decanediamine and 120 g of deionized water were added. kg, added into the reactor, nitrogen was passed through and oxygen was discharged twice, stirring was started, and the temperature was heated to 196°C. After reacting for 4 hours at a pressure of 1.3MPa, the pressure was slowly reduced to normal pressure, and the temperature of the reactor was raised to 240°C. The reactor was evacuated, and the pressure of the polymerization reactor was reduced to 2000Pa (absolute pressure). The reaction was carried out at 240°C and 2000Pa, and the stirring current was monitored. When the stirring current was 8.9A, stirring was stopped. The reaction was carried out under vacuum for a total of 3.5 hours. The material was extruded, stretched, cooled, and pelletized to obtain a toughened antistatic agent. At a temperature of 230°C and a pressure of 2.16kg, the melt index of the toughened antistatic agent was 4.1g / 10min.

[0034] The toughening modification formula is as follows: 80 kg of polyamide 1212, 4 kg of plasticizer N-butylbenzenesulfonamide, 15 kg of toughening antistatic agent, 50 g of antioxidant 168, and 70 g of antioxidant 1098.

[0035] (2) Add polyamide 1212, antioxidant, toughening antistatic agent in the required proportion to the high-speed mixer, stir at 400r / min for 8 minutes, and add the materials to the twin-screw extruder at a uniform speed through the feeder after they are completely mixed. The plasticizer is added at a uniform speed through the liquid feeding port reserved in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the toughening modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated, and dried to obtain the finished product.

[0036] The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of other zones was 230°C, the temperature of the die head was 190°C; the main speed of the extruder was 400r / min.

[0037] Comparative Example 1 (1) 60.48 kg of polyoxyethylene ether diacid (number average molecular weight of 1008), 13.8 kg of dodecanedioic acid, 20.64 kg of deionized water and 120 kg of deionized water were added to a reactor. The reactor was purged with nitrogen and oxygen was discharged twice. Stirring was started and the temperature was raised to 192°C. After reacting for 5 hours at a pressure of 1.2 MPa, the pressure was slowly reduced to normal pressure. At the same time, the temperature of the reactor was raised to 240°C. The reactor was evacuated and the pressure of the polymerization reactor was reduced to 2000 Pa (absolute pressure). The reactor was reacted at 240°C and 2000 Pa. The stirring current was monitored at the same time. When the stirring current was 9.0 A, stirring was stopped. The reactor was reacted for a total of 3 hours under vacuum. The material was extruded, stretched, cooled and pelletized to obtain an antistatic agent. Under the conditions of a temperature of 230°C and a pressure of 2.16 kg, the melt index of the antistatic agent was 3.1 g / 10 min.

[0038] The toughening modification formula is as follows: 80 kg of polyamide 1012, 4 kg of plasticizer N-butylbenzenesulfonamide, 16 kg of antistatic agent, 30 g of antioxidant 168, and 50 g of antioxidant 1098.

[0039] (2) Add polyamide 1012, antioxidant and antistatic agent into a high-speed mixer according to the required ratio of the formula, stir at 400r / min for 8 minutes, and add them into a twin-screw extruder through a feeder at a uniform speed after the materials are completely mixed. The plasticizer is added at a uniform speed through the liquid feeding port reserved in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the above-mentioned toughening and modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated and dried to obtain the finished product.

[0040] The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of other zones was 230°C, the temperature of the die head was 190°C; the main speed of the extruder was 400r / min.

[0041] Comparative Example 2 The toughening modification formula is as follows: 80 kg of polyamide 1012, 4 kg of plasticizer N-butylbenzenesulfonamide, 16 kg of maleic anhydride grafted ethylene-octene (POE-MAH), 30 g of antioxidant 168, and 50 g of antioxidant 1098.

[0042] Add polyamide 1012, antioxidant and antistatic agent into the high-speed mixer in the required proportion of the formula, stir for 8 minutes at 400r / min, and add them into the twin-screw extruder through the feeder at a uniform speed after the materials are completely mixed. The plasticizer is added at a uniform speed through the liquid feeding port reserved in the extruder by a liquid metering pump at a calculated speed to ensure that the ratio meets the requirements of the above-mentioned toughening and modification formula. After all the materials are melt-mixed and uniformly mixed by the twin-screw, they are extruded, cooled, granulated and dried to obtain the finished product.

[0043] The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of other zones was 230°C, the temperature of the die head was 190°C; the main speed of the extruder was 400r / min.

[0044] The mechanical properties of the products prepared in Examples 1-4 and Comparative Examples 1-2 after injection molding into standard specimens are shown in Table 1.

[0045] Table 1 Mechanical properties of standard splines obtained from Examples 1-4 and Comparative Examples 1-2 From the test results in Table 1, the toughening effect obtained by using the antistatic toughening agent used in the present invention is equivalent to the toughening effect obtained by using conventional POE-MAH as a toughening agent in Comparative Example 2, and the surface resistance is greatly reduced. Comparative Example 1 uses a hydrophilic carboxyl-terminated polyether as a soft segment, and the synthesized polyetheramide elastomer can reduce the surface resistance of the modified polyamide, but the toughening effect is not good.

[0046] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A toughened antistatic polyamide composite material, characterized in that: By weight, it includes the following components: Polyamide resin 100 parts Toughening antistatic agent 10-40 parts Plasticizer 1-10 parts Antioxidant 0.05-0.5 parts; The polyamide resin is obtained by polymerizing an aliphatic diacid and an aliphatic diamine, and the carbon number of the aliphatic diacid and the aliphatic diamine are both greater than or equal to 6.

2. The toughened antistatic polyamide composite material according to claim 1, characterized in that: The aliphatic diacid includes one or more of adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedicarboxylic acid, hexadecanedioic acid, heptadecanedioic acid and octadecanedicarboxylic acid; The aliphatic diamine includes one or more of hexamethylenediamine, heptamethylenediamine, octanediamine, nonamethylenediamine, decanediamine, undecanediamine, dodecanediamine, tridecanediamine, tetradecanediamine, pentadecanediamine, hexadecanediamine, heptadecanediamine and octadecanediamine.

3. The toughened antistatic polyamide composite material according to claim 1, characterized in that: The toughening antistatic agent is a polyetheramide elastomer, the hard segment is polyamide 1012, and the soft segment is a hydrophilic polyether and a hydrophobic polyether; The hydrophilic polyether is polyoxyethylene ether diacid, and the number average molecular weight is 600-3000; The hydrophobic polyether is polytetrahydrofuran ether diacid, and the number average molecular weight is 600-3000.

4. The toughened antistatic polyamide composite material according to claim 1, characterized in that: The plasticizer is N-butylbenzenesulfonamide.

5. The toughened antistatic polyamide composite material according to claim 1, characterized in that: The antioxidant is one of antioxidant 168 and antioxidant 1098 or a mixture of both substances.

6. The method for preparing the toughened antistatic polyamide composite material according to any one of claims 1 to 5, characterized in that: The following steps are included: (1) Add 100 parts of dodecanedioic acid, 100-200 parts of decanediamine, 100-500 parts of hydrophilic polyether, 100-500 parts of hydrophobic polyether and 800-1500 parts of deionized water into a reaction kettle, start stirring, heat to 180-220°C, react for 2-8 hours at a pressure of 0.8-2.0 MPa, reduce the pressure to normal pressure, and raise the system temperature to 220-250°C, then evacuate the reaction kettle, reduce the absolute pressure of the reaction kettle to 500-2000 Pa, and react for 3-5 hours to obtain a toughening antistatic agent; (2) Adding the polyamide resin, antioxidant and toughening antistatic agent obtained in step (1) into a high-speed mixer, stirring at 300-500 r / min for 5-10 minutes to completely mix the materials to obtain material A; (3) Add the mixed material A into the main hopper of the twin-screw extruder, feed the material into the twin-screw extruder through the main feed loss-in-weight scale, add plasticizer into the twin-screw extruder using a liquid loss-in-weight scale, and after all the materials are melt-mixed and uniformly mixed by the twin-screw, extrude, cool, granulate, dry, and package to obtain the final product.

7. The method for preparing the toughened antistatic polyamide composite material according to claim 6, characterized in that: Under the conditions of a temperature of 230° C. and a pressure of 2.16 kg, the melt index of the toughening antistatic agent is 2-8 g / 10 min.

8. The method for preparing the toughened antistatic polyamide composite material according to claim 6, characterized in that: In step (3), the temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 170-230°C, the temperature of other zones is 200-280°C, the temperature of the die head is 180-260°C; the main speed of the extruder is 100-600r / min.

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