Electroplatable high-temperature-resistant nylon composite material and preparation method thereof

Abstract

The invention relates to the technical field of nylon composite materials, in particular to an electroplatable high-temperature-resistant nylon composite material and a preparation method thereof.The PA6T / 66 copolymer is used as a main material and has the high high-temperature-resistant characteristic and toughness, and under the synergistic effect of added MXD6-G-MAH, chain extender, carbon nanotubes and ionic polymer resin, the high-temperature-resistant nylon composite material has the high-temperature-resistant characteristic and toughness. The surface of the high-temperature-resistant nylon composite material can better interact with metal ions in electroplating liquid, reduction deposition of the metal ions on the surface is promoted, a compact and firm electroplated layer is formed, and a metal coating with higher stability can be obtained after the high-temperature-resistant nylon composite material capable of being electroplated is electroplated. In addition, the toughening agent and the glass fiber are added, so that the strength of the material is further improved on the basis of the A6T / 66 copolymer; the halogen-free flame retardant and the synergistic flame retardant are added, so that the high-temperature resistance of the material is further improved. The electroplatable high-temperature-resistant nylon composite material is resistant to high temperature on the whole and high in toughness, the plating layer stability is good after electroplating, and the requirements of the SMT technology for high temperature resistance, toughness and plating layer stability of components are met.

Description

Technical Field

[0001] The present invention relates to the technical field of nylon composites, and particularly relates to a plating - applicable high - temperature resistant nylon composite material and a preparation method thereof. Background Art

[0002] With the development of electronic components towards miniaturization, integration, and high efficiency, the new surface mount technology (SMT) has an increasingly high requirement for the heat - resistant temperature of materials, rising from the previous 183°C to 215°C, and even requiring 270 - 280°C. Traditional materials are difficult to meet these requirements.

[0003] In addition, for connectors, USB sockets, power connectors, circuit breakers, motor components, etc. in 3C products, for example: connectors need to transmit electrical signals simultaneously (such as some hybrid connectors), and heat is easily generated during high - current and high - power use. To improve performance, reliability, and service life, based on plastics, electroplating a conductive metal layer on the surface can reduce contact resistance, ensure stable current transmission, reduce signal interference, and replace traditional metal parts. However, existing plastics have poor high - temperature resistance and toughness, and the stability of the plating layer after electroplating is poor, which cannot meet the requirements of the SMT process for the high - temperature resistance, toughness, and plating layer stability of components. Summary of the Invention

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the present invention is to provide a plating - applicable high - temperature resistant nylon composite material.

[0005] Another purpose of the present invention is to provide a preparation method of a plating - applicable high - temperature resistant nylon composite material. This preparation method is simple to operate, convenient to control, has high production efficiency, low production cost, and can be used for large - scale production.

[0006] The purpose of the present invention is achieved through the following technical solutions: A plating - applicable high - temperature resistant nylon composite material, comprising the following raw materials in parts by weight:

[0007]

[0008]

[0009] The electroplatable high-temperature resistant nylon composite material uses a PA6T / 66 copolymer as the main material, which has high high-temperature resistance characteristics and toughness. Utilizing the crystalline material characteristics of MXD6-G-MAH, the surface is made smoother, which helps prevent the leakage of glass fibers. In this way, metal ions in the electrolyte during electroplating are more likely to deposit on the surface, and the coating is denser and more uniform; the polar groups of maleic anhydride with a relatively high content in the chain extender are used to assist the attachment of the electroplating material; the conductivity of carbon nanotubes is used to assist the adsorption of the electroplating material and at the same time provide a matte effect for the material; the ionic polymer resin with ionic bonding copolymerization provides electroplating bonding points; under the synergistic effect of the added MXD6-G-MAH, chain extender, carbon nanotubes and ionic polymer resin, its surface can better interact with metal ions in the electroplating solution, promoting the reduction and deposition of metal ions on the surface, forming a dense and firm electroplating layer, which is beneficial to obtaining a metal coating with higher stability after electroplating the electroplatable high-temperature resistant nylon composite material. In addition, the added toughening agent and glass fiber further improve the material strength on the basis of the A6T / 66 copolymer; the added halogen-free flame retardant and synergistic flame retardant further improve the high-temperature resistance performance of the material on the basis of the A6T / 66 copolymer. The electroplatable high-temperature resistant nylon composite material is overall high in high-temperature resistance, high in toughness, and has good coating stability after electroplating, meeting the requirements of the SMT process for the high-temperature resistance, toughness and coating stability of components.

[0010] Preferably, the relative viscosity of the PA6T / 66 copolymer is 2.4 - 2.6, and the melting point is 314 ± 2 °C.

[0011] Adopting the above technical solution, the melting point and heat distortion temperature of the PA6T / 66 copolymer are much higher than those of ordinary PA materials, and the tensile strength, flexural strength and impact strength are all superior to ordinary PA materials, meeting the requirements of high-load working conditions and being applicable to electronic connectors, relays, switches, etc. for surface mount technology (SMT).

[0012] Preferably, the preparation method of each part of the MXD6-G-MAH includes the following steps:

[0013] (R1) Take 100 parts of polyhexamethylene isophthalamide, 1 - 10 parts of maleic anhydride and 0.1 - 2 parts of initiator by weight, heat and stir in a high-speed mixer at 60 °C for 3 - 5 min to obtain a blend;

[0014] (R2) Add the blend to the hopper of a twin-screw extruder and carry out melt extrusion granulation at the set temperature and screw speed to obtain a maleic anhydride grafted product;

[0015] (R3) Cool the maleic anhydride grafted product, crush it, wrap it with filter paper and put it into a Soxhlet extractor. Use ethanol as the solvent, heat and reflux in a water bath at 70 - 80 °C for 20 - 26 h for impurity removal, and then dry it in a vacuum oven at 100 - 115 °C to constant weight to obtain MXD6 - G - MAH;

[0016] Among them, in step (R2), the temperature settings of each section of the twin - screw extruder are as follows: Zone I 150 °C - 180 °C, Zone II 200 °C - 220 °C, Zone III 220 °C - 230 °C, Zone IV 230 °C - 240 °C, Zone V 240 °C - 250 °C, Zone VI 230 °C - 240 °C, Zone VII 200 °C - 210 °C, and the screw speed is 100 - 200 r / min.

[0017] Adopting the above - mentioned technical solution, the prepared MXD6 - G - MAH has the characteristics of a crystalline material, making the surface smoother, which is beneficial to preventing the leakage of glass fibers. In this way, metal ions in the electrolyte during electroplating are more likely to deposit on the surface, and the coating is denser and more uniform, and has good paintability. The molecular structure of the MXD6 group in MXD6 - G - MAH endows it with excellent surface flatness, which can form a smooth paint base. Under the synergistic effect of MXD6 and MAH, it can form a good bonding force with the coating, and its surface can better interact with metal ions in the electroplating solution, promoting the reduction and deposition of metal ions on the surface to form a dense and firm electroplated layer.

[0018] Preferably, the toughening agent is SEBS - g - MAH.

[0019] Preferably, the halogen - free flame retardant is an organic hypophosphite; the synergistic flame retardant is aluminum phosphite.

[0020] Adopting the above - mentioned technical solution, the organic hypophosphite and aluminum phosphite act synergistically to form a uniformly dispersed flame - retardant system through intermolecular interactions, improving the comprehensive mechanical properties of the composite material, and having the advantages of high phosphorus content, good heat resistance, high flame - retardant efficiency, etc. The flame - retardant mechanism significantly improves the flame - retardant grade of the nylon material through gas - phase free - radical quenching effect, gas dilution effect and condensed - phase carbon layer protection effect. By forming a residual covering layer with a cross - linked network structure, it plays a barrier protection role in the condensed phase, which is beneficial to improving the stability of the material at high temperatures. Further, the organic hypophosphite is OP1230 and / or OP1240.

[0021] Preferably, the chain extender is an alternating copolymer of ethylene and maleic anhydride with a 1:1 ratio, and the maleic anhydride content is greater than 78 wt%.

[0022] Adopting the above - mentioned technical solution, the polar groups of maleic anhydride with a higher content help the electroplating material to adhere, which is beneficial to the adsorption of metal ions and improves the stability of the coating after electroplating.

[0023] Preferably, the carbon nanotubes have a tube diameter of 6 - 15 nm, a tube length of 50 μm, and a specific surface area of 200 - 300 m 2 / g.

[0024] With the above technical solution, the conductivity of the carbon nanotubes assists the adsorption of the electroplating material and simultaneously provides a matte effect for the material.

[0025] Preferably, the ionomer resin is at least one of Surlyn resin 8920, Surlyn resin 8940, and Surlyn resin 8945.

[0026] With the above technical solution, it combines the chemical resistance of semi-crystalline polymers and the transparency of amorphous polymers, and has excellent low-temperature impact toughness and melt strength; in addition, the presence of ionic bonds makes the surface of Surlyn resin have a high polarity, providing electroplating bonding points, and can electrostatically adsorb or chemically bond with metal ions in the electroplating solution, thereby improving the adhesion between the coating and the substrate.

[0027] Preferably, the glass fiber is a high-modulus glass fiber with an elastic modulus of 92.0 GPa - 96.0 GPa, and the other additives are color powder. The high-modulus glass fiber has better dimensional stability, helps to increase the fiber content and mechanical properties, and makes the composite material have higher strength. Further, the glass fiber is Jushi E7CS10 - 03 - 568H or Jushi E8CS10 - 3 - 568H.

[0028] Another object of the present invention is achieved by the following technical solution: the preparation method of the electroplatable high-temperature resistant nylon composite material described above, comprising the following steps:

[0029] (S1), take PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber, and other additives by weight parts, and set aside;

[0030] (S2), premix the PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber, and other additives in a high-speed mixer for 1 - 3 min to obtain a premix;

[0031] (S3), extrude and pelletize the premix through a twin-screw extruder to obtain an electroplatable high-temperature resistant nylon composite material;

[0032] Among them, in step (S3), the processing temperatures of each section of the twin-screw extruder starting from the feeding section are 260 °C, 280 - 290 °C, 300 - 310 °C, 310 - 320 °C, 310 - 320 °C, 310 - 320 °C, 300 - 310 °C, 280 - 290 °C respectively, the head temperature is 270 - 280 °C, and the screw speed is 300 - 500 r / min.

[0033] The beneficial effects of the present invention are as follows: The electroplatable high-temperature resistant nylon composite material of the present invention is overall high-temperature resistant, high in toughness, and has good coating stability after electroplating, meeting the requirements of the SMT process for the high-temperature resistance, toughness, and coating stability of components.

[0034] The preparation method of the electroplatable high-temperature resistant nylon composite material of the present invention is simple in operation, convenient to control, high in production efficiency, low in production cost, and can be used for large-scale production. Description of the Drawings

[0035] Figure 1 is a schematic diagram before and after electroplating of the optical fiber connector product prepared in Example 1 of the present invention;

[0036] Figure 2 is a color schematic diagram before and after electroplating of the optical fiber connector product prepared in Example 1 of the present invention. Detailed Embodiments

[0037] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and the drawings. The content mentioned in the embodiments does not limit the present invention.

[0038] Example 1

[0039] An electroplatable high-temperature resistant nylon composite material, comprising the following raw materials in parts by weight:

[0040]

[0041]

[0042] The relative viscosity of the PA6T / 66 copolymer is 2.5 and the melting point is 314 °C.

[0043] The preparation method of each part of the MXD6-G-MAH comprises the following steps:

[0044] (R1), take 100 parts of polyhexamethylene isophthalamide, 6 parts of maleic anhydride and 1 part of initiator by weight, heat and stir in a high-speed mixer at 60 °C for 4 min to obtain a blend;

[0045] (R2), add the blend to the hopper of a twin-screw extruder, and perform melt extrusion granulation at a set temperature and screw speed to obtain a maleic anhydride grafted product;

[0046] (R3) Cool the maleic anhydride grafted product, crush it, wrap it with filter paper and put it into a Soxhlet extractor. Use ethanol as the solvent, heat and reflux in a 78 °C water bath for extraction to remove impurities for 24 h, and then dry it in a vacuum oven at 110 °C to constant weight to obtain MXD6-G-MAH;

[0047] Among them, in step (R2), the temperatures of each section of the twin-screw extruder are set as follows: zone I 180 °C, zone II 210 °C, zone III 230 °C, zone IV 240 °C, zone V 250 °C, zone VI 240 °C, zone VII 200 °C, and the screw speed is 150 r / min.

[0048] The toughening agent is SEBS-g-MAH.

[0049] The halogen-free flame retardant is a mixture of organic hypophosphite OP1230 and OP1240 in a weight ratio of 2:1; the synergistic flame retardant is aluminum phosphite.

[0050] The chain extender is an alternating copolymer of ethylene and maleic anhydride with a maleic anhydride content of 80 wt%.

[0051] The carbon nanotubes have a tube diameter of 10 nm, a tube length of 50 μm, and a specific surface area of 250 m 2 / g.

[0052] The ionic polymer resin is a mixture of Surlyn resin 8920 and Surlyn resin 8940 in a weight ratio of 3:1.

[0053] The glass fiber is Johns Manville E8CS10-3-568H, and the other auxiliary agent is color powder.

[0054] The preparation method of the electroplatable high-temperature resistant nylon composite material includes the following steps:

[0055] (S1) Weigh PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionic polymer resin, glass fiber and other auxiliary agents by weight parts for standby;

[0056] (S2) Premix the PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionic polymer resin, glass fiber and other auxiliary agents in a high-speed mixer for 2 min to obtain a premix;

[0057] (S3) Extrude and pelletize the premix through a twin-screw extruder to obtain an electroplatable high-temperature resistant nylon composite material;

[0058] Among them, in step (S3), the processing temperatures of each section of the twin-screw extruder starting from the feeding section are 260°C, 285°C, 300°C, 320°C, 320°C, 320°C, 310°C, and 290°C respectively, the head temperature is 280°C, and the screw speed is 400 r / min.

[0059] Example 2

[0060] A kind of electroplatable high-temperature resistant nylon composite material, comprising the following raw materials in parts by weight:

[0061]

[0062] The relative viscosity of the PA6T / 66 copolymer is 2.5 and the melting point is 314°C.

[0063] The preparation method of each part of the MXD6-G-MAH includes the following steps:

[0064] (R1), Take 100 parts of polyhexamethylene isophthalamide, 3 parts of maleic anhydride and 0.5 part of initiator by weight, and heat and stir in a high-speed mixer at 60°C for 4 min to obtain a blend;

[0065] (R2), Add the blend into the hopper of the twin-screw extruder, and carry out melt extrusion granulation at the set temperature and screw speed to obtain a maleic anhydride grafted product;

[0066] (R3), Cool the maleic anhydride grafted product and crush it, wrap it with filter paper and put it into a Soxhlet extractor, use ethanol as the solvent, heat and reflux in a 78°C water bath for extraction for 24 h to remove impurities, and then put it into a vacuum oven at 110°C to dry to constant weight to obtain MXD6-G-MAH;

[0067] Among them, in step (R2), the temperature settings of each section of the twin-screw extruder are: Zone I 180°C, Zone II 210°C, Zone III 230°C, Zone IV 240°C, Zone V 250°C, Zone VI 240°C, Zone VII 200°C, and the screw speed is 150 r / min.

[0068] The toughening agent is SEBS-g-MAH.

[0069] The halogen-free flame retardant is organic phosphite OP1240; the synergistic flame retardant is aluminum phosphite.

[0070] The chain extender is an alternating copolymer of ethylene and maleic anhydride with a maleic anhydride content of 80 wt%.

[0071] The carbon nanotubes have a tube diameter of 10 nm, a tube length of 50 μm, and a specific surface area of 250 m 2 / g.

[0072] The ionic polymer resin is Sarin resin 8945.

[0073] The glass fiber is Johns Manville E8CS10-3-568H, and the other auxiliary agent is color powder.

[0074] The preparation method of the electroplatable high-temperature resistant nylon composite material comprises the following steps:

[0075] (S1) Weigh PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotube, ionic polymer resin, glass fiber and other auxiliary agents by weight parts, and set aside;

[0076] (S2) Premix the PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotube, ionic polymer resin, glass fiber and other auxiliary agents in a high-speed mixer for 2 min to obtain a premix;

[0077] (S3) Extrude and pelletize the premix through a twin-screw extruder to obtain an electroplatable high-temperature resistant nylon composite material;

[0078] Among them, in step (S3), the processing temperatures of each section of the twin-screw extruder starting from the feeding section are 260 °C, 285 °C, 300 °C, 320 °C, 320 °C, 320 °C, 310 °C, 290 °C respectively, the head temperature is 280 °C, and the screw speed is 400 r / min.

[0079] Example 3

[0080] An electroplatable high-temperature resistant nylon composite material, comprising raw materials in the following weight parts:

[0081]

[0082] The relative viscosity of the PA6T / 66 copolymer is 2.5 and the melting point is 314 °C.

[0083] The preparation method of each part of the MXD6-G-MAH comprises the following steps:

[0084] (R1) Weigh 100 parts of polyhexamethylene isophthalamide, 8 parts of maleic anhydride and 1.5 parts of initiator by weight parts, heat and stir at 60 °C for 5 min in a high-speed mixer to obtain a blend;

[0085] (R2) Add the blend into the hopper of a twin-screw extruder, and carry out melt extrusion and pelletization at the set temperature and screw speed to obtain a maleic anhydride grafted product;

[0086] (R3), the maleic anhydride grafted product was cooled and crushed, wrapped with filter paper and placed in a Soxhlet extractor, ethanol was used as solvent, heated to reflux in a 78°C water bath, extracted for 24 hours to remove impurities, and then placed in a vacuum oven at 110°C to dry to constant weight to obtain MXD6-G-MAH;

[0087] Wherein, in step (R2), the temperature of each section of the twin-screw extruder is set to: 180°C in zone I, 210°C in zone II, 230°C in zone III, 240°C in zone IV, 250°C in zone V, 240°C in zone VI, and 200°C in zone VII, and the screw speed is 150r / min.

[0088] The toughening agent is SEBS-g-MAH.

[0089] The halogen-free flame retardant is a mixture of organic phosphinates OP1230 and OP1240 in a weight ratio of 3:1; and the synergistic flame retardant is aluminum phosphite.

[0090] The chain extender is a 1:1 alternating copolymer of ethylene and maleic anhydride, and the content of maleic anhydride is 80 wt%.

[0091] The carbon nanotube has a diameter of 10 nm, a length of 50 μm, and a specific surface area of ​​250 m 2 / g.

[0092] The ionomer resin is a mixture of Surlyn resin 8920 and Surlyn resin 8940 in a weight ratio of 5:1.

[0093] The glass fiber is Jushi E8CS10-3-568H, and the other additive is toner.

[0094] The preparation method of the electroplatable high temperature resistant nylon composite material comprises the following steps:

[0095] (S1), taking PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber and other additives according to weight parts, and setting aside;

[0096] (S2), premixing PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber and other additives in a high-speed mixer for 2 minutes to obtain a premix;

[0097] (S3), extruding the premix through a twin-screw extruder to granulate, to obtain a high temperature resistant nylon composite material that can be electroplated;

[0098] Among them, in step (S3), the processing temperatures of each section of the twin-screw extruder starting from the feeding section are 260 °C, 285 °C, 300 °C, 320 °C, 320 °C, 320 °C, 310 °C, 290 °C respectively, the head temperature is 280 °C, and the screw speed is 400 r / min.

[0099] Example 4

[0100] A kind of electroplatable high-temperature resistant nylon composite material, comprising the following raw materials in parts by weight:

[0101]

[0102] The relative viscosity of the PA6T / 66 copolymer is 2.5 and the melting point is 314 °C.

[0103] The preparation method of each part of the MXD6-G-MAH comprises the following steps:

[0104] (R1), take 100 parts of polyhexamethylene isophthalamide, 5 parts of maleic anhydride and 0.8 part of initiator by weight, heat and stir in a high-speed mixer at 60 °C for 5 min to obtain a blend;

[0105] (R2), add the blend into the hopper of the twin-screw extruder, and carry out melt extrusion granulation at the set temperature and screw speed to obtain a maleic anhydride grafted product;

[0106] (R3), cool the maleic anhydride grafted product and then crush it, wrap it with filter paper and put it into a Soxhlet extractor, use ethanol as a solvent, heat and reflux in a water bath at 78 °C for extraction for 24 h to remove impurities, and then put it into a vacuum oven at 110 °C to dry to constant weight to obtain MXD6-G-MAH;

[0107] Among them, in step (R2), the temperature settings of each section of the twin-screw extruder are: zone I 180 °C, zone II 210 °C, zone III 230 °C, zone IV 240 °C, zone V 250 °C, zone VI 240 °C, zone VII 200 °C, and the screw speed is 150 r / min.

[0108] The toughening agent is SEBS-g-MAH.

[0109] The halogen-free flame retardant is organic phosphite OP1230; the synergistic flame retardant is aluminum phosphite.

[0110] The chain extender is an alternating copolymer of ethylene and maleic anhydride with a maleic anhydride content of 80 wt%.

[0111] The carbon nanotubes have a tube diameter of 10 nm, a tube length of 50 μm, and a specific surface area of 250 m 2 / g.

[0112] The ionic polymer resin is Sarin resin 8920.

[0113] The glass fiber is Jushi E8CS10-3-568H, and the other auxiliary agent is color powder.

[0114] The preparation method of the electroplatable high-temperature resistant nylon composite material comprises the following steps:

[0115] (S1) Weigh PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotube, ionic polymer resin, glass fiber and other auxiliary agents by weight parts and set aside;

[0116] (S2) Premix the PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotube, ionic polymer resin, glass fiber and other auxiliary agents in a high-speed mixer for 2 min to obtain a premix;

[0117] (S3) Extrude and pelletize the premix through a twin-screw extruder to obtain the electroplatable high-temperature resistant nylon composite material;

[0118] Among them, in step (S3), the processing temperatures of each section of the twin-screw extruder from the feeding section are 260 °C, 285 °C, 300 °C, 320 °C, 320 °C, 320 °C, 310 °C, 290 °C respectively, the head temperature is 280 °C, and the screw speed is 400 r / min.

[0119] Comparative Example 1

[0120] The difference between this Comparative Example 1 and Example 1 is that:

[0121] MXD6-G-MAH is replaced by POE-G-MAH, model FB521A.

[0122] Comparative Example 2

[0123] The difference between this Comparative Example 2 and Example 1 is that:

[0124] The ionic polymer resin is replaced by high-density polyethylene HDPE 5000S.

[0125] Comparative Example 3

[0126] The difference between this Comparative Example 3 and Example 1 is that:

[0127] An electroplatable high-temperature resistant nylon composite material, comprising the following raw materials by weight parts:

[0128]

[0129] That is, the composite material does not contain MXD6-G-MAH.

[0130] Example 5

[0131] I. Take the nylon composite material of Example 1. After the nylon composite material is injection molded into an optical fiber connector product by an injection mold, it is cooled, and then a neutral degreasing agent HQ-125B is used to remove the surface oil stain to avoid contamination in subsequent steps; the optical fiber connector product is treated with a chromic acid / sulfuric acid mixed solution to form a microporous structure to enhance the bonding force; after neutralizing the residual acid solution, it is sensitized with a stannous chloride solution to adsorb reducing substances on the surface; colloidal palladium is used to form active sites on the surface to promote metal deposition; a conductive nickel metal layer is deposited on the surface through an autocatalytic reaction to provide a conductive substrate for subsequent electroplating of zinc; in a zinc salt electrolyte, with the optical fiber connector product as the cathode and a zinc plate as the anode, a zinc layer is deposited by current, process parameters: current density 2 A / dm 2 , temperature 30 °C, pH value 4 - 5, time 20 minutes; chromate passivation is adopted to enhance the corrosion resistance of the zinc layer and improve the appearance, and a plated sample is obtained. The results are compared as Figure 1-2 shown. It can be seen from Figure 1-2 that the electroplating effect of the product is good.

[0132] II. Take the nylon composite materials of Examples 1 - 4 and Comparative Examples 1 - 3, and test their tensile strength, notched Izod impact strength, heat distortion temperature, flame retardancy and electroplating effect;

[0133] Among them, the test method for the electroplating effect is as follows:

[0134] Take the nylon composite material and injection mold it into a test plate (specification 150 mm * 100 mm * 1 mm), then cool it, and use a neutral degreasing agent HQ-125B to remove the surface oil stain to avoid contamination in subsequent steps; the test plate is treated with a chromic acid / sulfuric acid mixed solution to form a microporous structure to enhance the bonding force; after neutralizing the residual acid solution, it is sensitized with a stannous chloride solution to adsorb reducing substances on the surface; colloidal palladium is used to form active sites on the surface to promote metal deposition; a conductive nickel metal layer is deposited on the surface through an autocatalytic reaction to provide a conductive substrate for subsequent electroplating of zinc; in a zinc salt electrolyte, with the test plate as the cathode and a zinc plate as the anode, a zinc layer is deposited by current, process parameters: current density 2 A / dm 2 , temperature 30 °C, pH value 4 - 5, time 20 minutes; chromate passivation is adopted to enhance the corrosion resistance of the zinc layer and improve the appearance, and a sample is obtained. Then, according to "ISO 2409-2013 Paints and varnishes - Cross-cut test", observe the peeling situation of the coating and evaluate the grade.

[0135] The test results are shown in Table 1 below:

[0136]

[0137] As can be seen from Table 1 above, the electroplatable high-temperature resistant nylon composite material is overall high-temperature resistant, has high toughness, and has good coating stability after electroplating, meeting the requirements of the SMT process for the high temperature resistance, toughness, and coating stability of components.

[0138] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A high temperature resistant nylon composite material capable of being electroplated, characterized in that: The invention comprises the following raw materials in parts by weight:

2. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The relative viscosity of the PA6T / 66 copolymer is 2.4-2.6, and the melting point is 314±2°C.

3. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The preparation method of each portion of MXD6-G-MAH comprises the following steps: (R1), taking 100 parts of poly(m-xylylene adipamide), 1-10 parts of maleic anhydride and 0.1-2 parts of initiator by weight, heating and stirring at 60° C. for 3-5 minutes in a high-speed mixer to obtain a blend; (R2), adding the blend into the hopper of a twin-screw extruder, and performing melt extrusion granulation at a set temperature and screw speed to obtain a maleic anhydride grafted product; (R3), the maleic anhydride grafted product was cooled and crushed, wrapped with filter paper and placed in a Soxhlet extractor, ethanol was used as solvent, heated to reflux in a 70-80°C water bath, extracted for 20-26h to remove impurities, and then placed in a vacuum oven at 100-115°C to dry to constant weight to obtain MXD6-G-MAH; Wherein, in step (R2), the temperature of each section of the twin-screw extruder is set to: 150℃-180℃ in zone I, 200℃-220℃ in zone II, 220℃-230℃ in zone III, 230℃-240℃ in zone IV, 240℃-250℃ in zone V, 230℃-240℃ in zone VI, and 200℃-210℃ in zone VII, and the screw speed is 100-200r / min.

4. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The toughening agent is SEBS-g-MAH.

5. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The halogen-free flame retardant is an organic phosphinate; and the synergistic flame retardant is aluminum phosphite.

6. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The chain extender is a 1:1 alternating copolymer of ethylene and maleic anhydride, and the maleic anhydride content is greater than 78 wt%.

7. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The carbon nanotubes have a diameter of 6-15 nm, a length of 50 μm, and a specific surface area of ​​200-300 m 2 / g.

8. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The ionomer resin is at least one of Surlyn resin 8920, Surlyn resin 8940 and Surlyn resin 8945.

9. The electroplatable high temperature resistant nylon composite material according to claim 1, characterized in that: The glass fiber is a high modulus glass fiber with an elastic modulus of 92.0 GPa-96.0 GPa, and the other auxiliary agent is a color powder.

10. A method for preparing the electroplatable high temperature resistant nylon composite material according to any one of claims 1 to 9, characterized in that: The steps include: (S1), taking PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber and other additives according to weight parts, and setting aside; (S2), premixing PA6T / 66 copolymer, MXD6-G-MAH, toughening agent, halogen-free flame retardant, synergistic flame retardant, chain extender, carbon nanotubes, ionomer resin, glass fiber and other additives in a high-speed mixer for 1-3 minutes to obtain a premix; (S3), extruding the premix through a twin-screw extruder to granulate, to obtain a high temperature resistant nylon composite material that can be electroplated; Wherein, in step (S3), the processing temperatures of the twin-screw extruder in each section starting from the feeding section are 260°C, 280-290°C, 300-310°C, 310-320°C, 310-320°C, 310-320°C, 300-310°C, and 280-290°C, the head temperature is 270-280°C, and the screw speed is 300-500r / min.

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