CN114656724A - Conductive master batch, electromagnetic shielding enhanced polyamide composition and application thereof - Google Patents
Conductive master batch, electromagnetic shielding enhanced polyamide composition and application thereof Download PDFInfo
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Abstract
The invention discloses a conductive master batch, an electromagnetic shielding enhanced polyamide composition and application thereof, and belongs to the technical field of electromagnetic shielding materials. The conductive master batch comprises the following components in parts by weight: 79-89 parts of PP resin, 30-50 parts of conductive filler and 0-2 parts of auxiliary agent, wherein the conductive filler is solid glass microspheres with silver-plated surfaces, the particle size D90 of the solid glass microspheres is 20-45 mu m, and the mass content of silver in the coating is 8-20%. The conductive master batch of the invention forms a uniform conductive layer on the surface of the conductive master batch by adding the solid glass microspheres with silver-plated surfaces as conductive fillers, and has higher conductivity. When the conductive master batch is applied to the polyamide composition, the conductivity of the polyamide material can be realized, the defect that the polyamide material is easy to warp and deform can be obviously improved, the polyamide composition has the characteristic that the shrinkage rates in the flowing direction and the vertical flowing direction are close, and the problem of warping caused by inconsistent shrinkage rates is further avoided.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding materials, and particularly relates to a conductive master batch, an electromagnetic shielding reinforced polyamide composition and application thereof.
Background
New energy automobiles are a necessary trend for the development of the automobile industry in the 21 st century. The new energy vehicle, especially the electric vehicle, is different from the traditional fuel oil vehicle in that a large number of electronic components, especially various signal sensors, induction radars and the like are added to the new energy vehicle, especially various induction radars are distributed around the body of the new energy vehicle in the continuous development and popularization of future automatic driving, and the higher requirement is necessarily provided for the electromagnetic shielding performance of the material. The avoidance of mutual interference between signals is a new energy vehicle, especially a new energy vehicle with an automatic driving function, which is the most important prerequisite and guarantee for requirements and driving safety. The polymer material with electromagnetic shielding function needs to have a conductive function, and the current main realization method comprises the steps of adding conductive metal powder or carbon-based material into the polymer and coating a conductive coating on the surface of the material, but the defects of non-uniform dispersion, poor conductive effect, easy oxidation, high price and the like exist.
The prior art discloses an electromagnetic shielding polyamide material which is prepared from the following raw materials in parts by weight: 75-85 parts of polyamide resin; PEDOT-g-MAH 3-5 parts of PSS conductive powder; 10-15 parts of carbon fiber; 0.5-2 parts of a silane coupling agent; 0.1-0.5 part of antioxidant; and 2-3 parts of other auxiliary agents, wherein conductive powder and a large amount of carbon fibers are added, so that the dispersion uniformity in a system is poor, the improvement of the conductive effect is influenced, and the improvement of the water absorption and warping performance is not facilitated.
Disclosure of Invention
The invention aims to overcome the defect and the defect that the conductivity of the existing electromagnetic shielding material is improved to a limited extent due to poor dispersibility of conductive components, and provides a conductive master batch which is obtained by the cooperation of specific conductive filler and PP resin and has high conductivity, so that the conductivity of a polyamide material can be improved, the water absorption rate is effectively reduced, and the warping property is improved.
The invention also aims to provide the electromagnetic shielding reinforced polyamide composition, wherein the conductive master batch is applied to the polyamide composition, so that the conductive performance of the polyamide composition is further improved, the water absorption of the polyamide composition is reduced, and the problem of warping deformation of the polyamide composition is solved.
The invention further aims to provide an application of the electromagnetic shielding reinforced polyamide composition in preparation of new energy automobile electronic devices.
The invention further aims to provide a new energy automobile electronic device.
The above purpose of the invention is realized by the following technical scheme:
the conductive master batch comprises the following components in parts by weight:
79-89 parts of PP resin, 30-50 parts of conductive filler and 0-2 parts of auxiliary agent,
the conductive filler is a solid glass microsphere with a silver-plated surface, the particle size D90 of the solid glass microsphere is 20-45 mu m, and the mass content of plating silver relative to the solid glass microsphere is 8-20%.
In particular embodiments, the adjuvants of the present invention may be antioxidants and lubricants.
Among them, it should be noted that:
the conductive material is a solid glass microsphere with the surface subjected to silver plating treatment, and a uniform conductive layer is formed on the surface of the solid glass microsphere, so that the conductive material has high conductivity.
The conductive material is obtained by silver plating of the solid glass microspheres, the hollow glass microspheres can be sheared by a screw in the production process and cannot be processed, and the solid glass microspheres are more favorable for maintaining the processability and the mechanical property. The plating silver of the conductive filler obviously improves the conductivity of the solid glass microspheres, the particle size of the microspheres can influence the content of silver plating, the larger the particle size is, the lower the upper limit of the maximum silver content plated is, and the improvement of the conductivity can be influenced.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and the specific preparation method can refer to the following steps:
mixing PP resin, conductive filler and compatilizer according to parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
In order to better improve the conductivity and the application performance of the conductive master batch, in a specific embodiment, the particle size D90 of the solid glass microsphere is preferably 25 to 30 μm.
In order to better improve the conductivity and application performance of the conductive master batch, in a specific embodiment, the plating silver content of the solid glass microsphere is preferably 10-12% by mass.
In a specific embodiment, in order to better ensure the dispersibility of the conductive filler in the masterbatch and make the compatibility of the conductive filler and the PP resin better, preferably, the PP is copolymerized PP with a melt index of 10-30 g/10min, and the detection conditions are as follows: 230 ℃, 2.16kg, test standard: ISO 1133 + 2011.
The conductive master batch disclosed by the invention has good conductive performance, does not have the problem of uneven dispersion, can be widely applied to improving the conductive performance of plastic materials and enhancing the electromagnetic shielding performance, and also specifically protects the application of the conductive master batch in preparing the electromagnetic shielding enhanced polyamide composition.
An electromagnetic shielding reinforced polyamide composition comprises the following components in parts by weight:
28-69 parts of polyamide, 20-50 parts of glass fiber, 10-20 parts of conductive master batch, 5-15 parts of compatilizer and 0-2 parts of processing aid.
In a particular embodiment, the polyamide of the present invention may be a nylon resin, including PA610 and PA 612.
In a specific embodiment, the processing aid comprises an antioxidant and a lubricant, wherein the antioxidant can be one or more of a phosphite antioxidant and a hindered phenol antioxidant; the lubricant can be one or more of amides, esters or polyethylene waxes.
The preparation method of the electromagnetic shielding reinforced polyamide composition can adopt conventional melt blending granulation, and the specific preparation method can refer to the following steps:
the conductive master batch, the glass fiber, the compatilizer and the processing aid are added into the polyamide resin together according to the weight parts, and the reinforced polyamide material with good conductivity and capable of being used for electromagnetic shielding is prepared through double-screw extrusion-level melt blending.
The polyamide is nylon resin, the nylon has high water absorption, the existing glass fiber reinforced nylon has the warping problem due to the orientation of the glass fiber, the conductive master batch is added into the electromagnetic shielding reinforced polyamide composition, the PP in the conductive master batch does not absorb water, the water absorption rate of the electromagnetic shielding reinforced polyamide composition can be reduced, and the solid glass beads in the conductive master batch can solve the warping problem caused by the orientation of the glass fiber in the electromagnetic shielding reinforced polyamide composition.
The conductive master batch added into the electromagnetic shielding reinforced polyamide composition can realize the conductivity of the polyamide material, obviously improve the defect that the polyamide material is easy to warp and deform, and further avoid the problem of warping caused by inconsistent shrinkage because the polyamide composition has the characteristic of approximate shrinkage in the flow direction and the vertical flow direction.
For ordinary glass fiber reinforced nylon, the introduction of PP can further reduce the water absorption of the composition.
In a specific embodiment, in order to further enhance the compatibility between nylon and PP and the microbeads, preferably, the compatibilizer is ethylene-vinyl alcohol copolymer.
The invention also specifically protects the application of the electromagnetic shielding reinforced polyamide composition in the preparation of new energy automobile electronic devices, such as radar brackets, signal sensors, radar wave covers and the like.
The invention also discloses a new energy automobile electronic device which is prepared from the raw materials of the electromagnetic shielding reinforced polyamide composition.
Compared with the prior art, the invention has the beneficial effects that:
the solid glass microspheres with silver-plated surfaces are added into the conductive master batch as conductive filler, so that a uniform conductive layer is formed on the surface of the conductive master batch, and the conductive master batch has high conductivity.
When the conductive master batch is applied to the polyamide composition, the conductivity of the polyamide material can be realized, the defect that the polyamide material is easy to warp and deform can be obviously improved, the polyamide composition has the characteristic that the shrinkage rates in the flowing direction and the vertical flowing direction are close, the problem of warping caused by inconsistent shrinkage rates is further avoided, and the PP in the conductive master batch does not absorb water, so that the water absorption rate of the electromagnetic shielding reinforced polyamide composition can be further reduced.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
The raw materials for the examples and comparative examples of the present invention are illustrated below:
the PP resin-1 is copolymerized PP, the melt index is 10g/10min, the mark is K9010, and the manufacturer is China petrochemical;
PP resin-2 is copolymerized PP, the melt index is 30g/10min, the brand BH3800, Korean SK of manufacturer;
the PP resin-3 is copolymerized PP, the melt index is 8g/10min, the trade name is 7033N, and the manufacturer exxonmobil;
PP resin-4 is copolymerized PP, the melt index is 60g/10min, the trade mark BX3900, the producer is south China petrochemical;
conductive filler-1: the solid glass microspheres with silver-plated surfaces have the particle size D90 of 20 mu m and the mass content of silver of a plating layer of 20 percent, and are prepared by the following steps: beijing Tebao antistatic equipment manufacturer;
conductive filler-2: the solid glass microspheres with silver-plated surfaces have the particle size D90 of 45 mu m, the mass content of silver of a plating layer of 8 percent and the brand number: SG-230P16, manufacturer: beijing Tebao antistatic equipment manufacturer;
conductive filler-3: the solid glass microspheres with silver-plated surfaces have the particle size D90 of 25 mu m, the mass content of silver of a plating layer of 12 percent and the brand number: SG-300P12, manufacturer: beijing Tebao antistatic equipment manufacturer;
conductive filler-4: the solid glass microsphere with silver-plated surface has a particle size D90 of 60 μm and a plating silver mass content of 4%, and is manufactured by the following steps: the preparation method of the Beijing Tebao antistatic equipment factory comprises the following steps:
the silver-plated glass microspheres are formed with silver plating layers with different thicknesses on the surfaces of the hollow glass microspheres by adopting a chemical plating technology through molding and surface treatment processes, and the mass fraction of silver of the plating layers is adjusted by controlling the thickness of the plating layers;
the conductive filler-5 is a solid glass microsphere with the surface subjected to silver plating treatment, the particle size D90 of the solid glass microsphere is 10 mu m, the mass content of the silver of the plating layer is 20 percent, and the manufacturing method comprises the following steps: in the Beijing Tebao anti-static equipment factory,
wherein, the product of the trademark SG-300P20 provided by the Beijing Tebao antistatic equipment factory contains different conductive fillers with the particle diameters of 20 microns and 10 microns of solid glass microspheres, and the conductive filler-1 and the conductive filler-5 are obtained by screening the product of the trademark SG-300P20 provided by the Beijing Tebao antistatic equipment factory through screens with different meshes;
conventional conductive masterbatch, designation 6900, manufacturer: uranium in Dongguan;
glass fiber: ECS13-03-510, china boulder;
polyamide: PA612, brand: a150, wide range of Shandong of the manufacturer;
a compatilizer: ethylene vinyl alcohol copolymer, designation E105B, manufacturer: kolepi japan;
antioxidant: hindered phenolic antioxidants, commercially available, other parallel examples of the invention and comparative examples are the same commercially available product;
lubricant: amide lubricants, commercially available, other parallel examples of the invention and comparative examples are all the same commercially available product.
Example 1
The conductive master batch comprises the following components in parts by weight: 79 parts of PP resin, 50 parts of conductive filler, 0.5 part of antioxidant and 0.5 part of lubricant as auxiliaries.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 2
The conductive master batch comprises the following components in parts by weight: 89 parts of PP resin, 30 parts of conductive filler, 0.5 part of antioxidant and 0.5 part of lubricant as auxiliaries.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 3
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler, 0.5 part of antioxidant and 0.5 part of lubricant as auxiliaries.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 4
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin and 40 parts of conductive filler.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 5
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-2, the conductive filler is conductive filler-1, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 6
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-3, the conductive filler is conductive filler-1, and the auxiliary agent comprises 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 7
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-4, the conductive filler is conductive filler-1, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 8
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-1, the conductive filler is conductive filler-2, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Example 9
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-1, the conductive filler is conductive filler-3, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing the components in parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Examples 10 to 12
An electromagnetic shielding reinforced polyamide composition comprises the following components in parts by weight as shown in the following table 1.
TABLE 1
Wherein the conductive masterbatch is the conductive masterbatch of example 4.
The preparation method of the electromagnetic shielding reinforced polyamide composition of the embodiment 10 to 12 is melt blending granulation, and the specific preparation method is as follows:
the conductive master batch, the glass fiber, the compatilizer and the processing aid are added into the polyamide resin together according to the weight parts, and the reinforced polyamide material with good conductivity and capable of being used for electromagnetic shielding is prepared through double-screw extrusion-level melt blending.
Example 13
The electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, and is characterized in that the conductive master batch is the conductive master batch in example 1.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 14
An electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, except that the conductive master batch is the conductive master batch in example 2.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 15
The electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, and is characterized in that the conductive master batch is the conductive master batch in example 3.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 16
An electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, except that the conductive master batch is the conductive master batch in example 5.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 17
An electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, except that the conductive master batch is the conductive master batch of example 6.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 18
An electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, except that the conductive master batch is the conductive master batch of example 7.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 19
The electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, and is characterized in that the conductive master batch is the conductive master batch in example 8.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Example 20
An electromagnetic shielding reinforced polyamide composition comprises the same components and contents in parts by weight as those in example 12, except that the conductive master batch is the conductive master batch of example 9.
The preparation method of the electromagnetic shielding reinforced polyamide composition is the same as that of example 12.
Comparative example 1
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-1, the conductive filler is conductive filler-4, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing PP resin, conductive filler and compatilizer according to parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Comparative example 2
The conductive master batch comprises the following components in parts by weight: 85 parts of PP resin, 40 parts of conductive filler and 1 part of auxiliary agent.
Wherein the PP resin is PP resin-1, the conductive filler is conductive filler-5, and the auxiliary agent is 0.5 part of antioxidant and 0.5 part of lubricant.
The preparation method of the conductive master batch can adopt conventional melt blending granulation, and comprises the following specific steps:
mixing PP resin, conductive filler and compatilizer according to parts by weight, adding the mixture into a double-screw extruder for melt blending, and preparing the conductive master batch by shearing and granulating.
Comparative example 3
The conductive master batch comprises the following components in parts by weight: 79 parts of PP resin, 60 parts of conductive filler, 0.5 part of antioxidant and 0.5 part of lubricant.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
Comparative example 4
The conductive master batch comprises the following components in parts by weight: 89 parts of PP resin, 20 parts of conductive filler, 0.5 part of antioxidant and 0.5 part of lubricant.
Wherein the PP resin is PP resin-1, and the conductive filler is conductive filler-1.
Comparative example 5
A polyamide composition comprising the same components and amounts in parts by weight as in example 12, except that it does not contain a conductive masterbatch.
Comparative example 6
The polyamide composition comprises the following components in parts by weight:
polyamide PA 61269, glass fiber 20, conductive master batch 8 of example 4, compatilizer 5, antioxidant 1 and lubricant 1.
Comparative example 7
The polyamide composition comprises the following components in parts by weight:
polyamide PA 61228 parts, glass fiber 50 parts, conductive master batch 25 parts of embodiment 4, compatilizer 15 parts, antioxidant 0.5 part and lubricant 0.5 part.
Comparative examples 8 to 11
The polyamide composition comprises the following components in parts by weight:
polyamide PA 61250 parts, glass fiber 30 parts, conductive master batch 15 parts, compatilizer 10 parts, antioxidant 0.8 part and lubricant 0.8 part.
Wherein the conductive master batch is the conductive master batch of comparative examples 1-4, respectively.
Comparative example 12
The polyamide composition comprises the following components in parts by weight:
polyamide PA 61250 parts, glass fiber 30 parts, conductive master batch 15 parts, compatilizer 10 parts, antioxidant 0.8 part and lubricant 0.8 part.
Wherein the conductive master batch is a commercially available conductive master batch.
Result detection
The detection of the relevant resistivity of the conductive master batches of the above embodiment and the comparative example specifically includes: the specific detection method comprises the following steps:
volume resistivity: the test was carried out according to IEC 62631-2016,
surface resistivity: the test was carried out according to IEC 62631 and 2016.
Both the volume resistivity and the surface resistivity can characterize the conductivity of the polyamide composition, and a smaller resistivity value indicates a better conductivity of the material.
The electromagnetic shielding reinforced polyamide compositions of the examples and the comparative examples are tested for conductivity, shrinkage and water absorption, and the specific testing method is as follows:
shrinkage rate: test shrinkage board size 220 x 50 x 2mm water absorption according to ISO 294-4-2018: ISO 62-2008 and ISO 1110-2019, the water absorption was calculated by measuring the weight change before and after water absorption.
The specific test results are shown in tables 2 and 3 below.
TABLE 2
| Serial number | Volume resistivity/omega cm | Surface resistivity/omega |
| Example 1 | 105 | 104 |
| Example 2 | 107 | 106 |
| Example 3 | 104 | 103 |
| Example 4 | 104 | 103 |
| Example 5 | 104 | 103 |
| Example 6 | 105 | 105 |
| Example 7 | 106 | 105 |
| Example 8 | 105 | 104 |
| Example 9 | 103 | 103 |
| Comparative example 1 | 109 | 108 |
| Comparative example 2 | 108 | 107 |
| Comparative example 3 | 105 | 104 |
| Comparative example 4 | 1011 | 1010 |
| Comparative example 5 | 1015 | 1014 |
| Comparative example 6 | 1011 | 1010 |
| Comparative example 7 | 107 | 106 |
TABLE 3
As can be seen from the data in tables 2 and 3 above, the electromagnetic shielding reinforced polyamide composition of the present invention has good electrical conductivity, the electrical conductivity of the polyamide composition can be significantly improved by adding the conductive masterbatch, and the shrinkage rate of the polyamide composition is also effectively improved, the shrinkage rate (vertical flow direction) of the polyamide composition is 0.6 or less, the shrinkage rate (flow direction) of the polyamide composition is 0.35 or less, the equilibrium water absorption rate is 1.30 or less, the polyamide composition has good equilibrium water absorption rate and shrinkage rate, and the warpage problem caused by non-uniform shrinkage rate is avoided.
Comparative examples 1 and 2 using conductive fillers outside the scope of the present invention, the conductivity was apparently not as good as that of the examples of the present invention, and the shrinkage of the polyamide compositions (comparative examples 8 and 9) used therein was also affected to some extent, and the problem of warpage could not be solved well.
The conductive filler of comparative example 3 is added too much, and the conductive performance of the conductive filler is not obviously improved compared with that of the conductive filler of the example, which shows that the increase of the amount of the conductive filler does not improve the conductive performance. The conductive filler of comparative example 4 was added too little, and the conductive performance was apparently not able to achieve the effects of the examples of the present invention. And the shrinkage rates of comparative examples 3 and 4 were both affected to some extent, and the warpage problem could not be solved well.
Comparative example 5 has no conductive masterbatch, has poor conductivity, and also has poor balanced water absorption and shrinkage rate performance, and cannot solve the problems of water absorption and warpage.
The polyamide composition of comparative example 6, in which the conductive master batch was added too little, exhibited a conductivity that was not significantly able to achieve the effects of the examples of the present invention. The polyamide composition conductive master batch of comparative example 7 is added too much, and the conductivity of the polyamide composition conductive master batch is not obviously improved compared with that of the polyamide composition conductive master batch of the example, which shows that the increase of the dosage of the polyamide composition conductive master batch has no improvement effect on the conductivity improvement.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The conductive master batch is characterized by comprising the following components in parts by weight:
79-89 parts of PP resin, 30-50 parts of conductive filler and 0-2 parts of auxiliary agent,
the conductive filler is solid glass microspheres with surfaces subjected to silver plating treatment, the particle size D90 of the solid glass microspheres is 20-45 microns, and the mass content of plating silver relative to the solid glass microspheres is 8-20%.
2. The conductive masterbatch of claim 1, wherein the solid glass microspheres have a particle size D90 of 25-30 μm.
3. The conductive masterbatch of claim 1, wherein the solid glass microspheres have a silver coating content of 10-12% by mass.
4. The conductive masterbatch of claim 1, wherein the PP is a copolymer PP, the melt index is 10-30 g/10min, and the detection conditions are as follows: 230 ℃, 2.16kg, test standard: ISO 1133-2011.
5. Use of the conductive masterbatch of any one of claims 1-4 in the preparation of electromagnetic shielding reinforced polyamide composition.
6. The electromagnetic shielding reinforced polyamide composition is characterized by comprising the following components in parts by weight:
28-69 parts of polyamide, 20-50 parts of glass fiber, 10-20 parts of the conductive master batch of any one of claims 1-4, 5-15 parts of a compatilizer and 0-2 parts of a processing aid.
7. The electromagnetic shielding reinforced polyamide composition of claim 6 wherein the compatibilizer is ethylene vinyl alcohol.
8. The electromagnetic shielding reinforced polyamide composition of claim 6, wherein the processing aid comprises at least one of an antioxidant and a lubricant.
9. Use of the electromagnetic shielding reinforced polyamide composition of claims 6-8 in the preparation of new energy automobile electronic devices.
10. A new energy automobile electronic device, which is characterized in that the electronic device is prepared from raw materials comprising the electromagnetic shielding reinforced polyamide composition as claimed in any one of claims 6 to 8.
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