A modified LCP material, its preparation method and application

Abstract

The application discloses a modified LCP material and a preparation method and application thereof, and belongs to the technical field of high polymer material modification. The modified LCP material provided by the application comprises the following raw materials in preparation: a chain extender and an LCP resin; the chain extender is selected from an epoxy chain extender, and the epoxy chain extender contains two or more than two alicyclic epoxy groups. The LCP resin is modified by using the specific chain extender, so that the viscosity of the LCP material is improved even without a compatibilizer, meanwhile, the problems of poor compatibility and uneven dispersion of the chain extender and the matrix resin are solved, and the film forming performance of the modified LCP material is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer material modification, and particularly relates to a modified LCP material and a preparation method and application thereof. BACKGROUND

[0002] Liquid crystal polymer (LCP) has the characteristics of high temperature resistance, high mechanical strength, good chemical stability, low thermal expansion coefficient, low water absorption, low dielectric constant and low dielectric loss, and has a wide application prospect in the fields of electronic appliances, communication, aerospace, etc. At present, the processing properties of domestic film-grade LCP resin cannot match those of Japanese Bori and American Celanese, and due to the material properties of LCP, the melt strength is low when the LCP is in a molten state, the film bubble is unstable during the blowing process, and the LCP needs to be processed by using special equipment due to the orientation characteristics of the LCP molecular chain.

[0003] In terms of high polymer material modification technology, according to whether there is formation and rupture of new and old chemical bonds, it can be divided into chemical modification and physical blending modification. Common chemical modifications include graft modification and block modification, and physical modifications include filling and reinforcing modification. At present, the LCP modification technology is more focused on the reinforcing modification of LCP, such as using white graphene to reinforce the mechanical properties and thermal conductivity of LCP, using glass fiber woven cloth to fill and modify to improve the wear resistance of LCP, and using polyphenylene ether (PPE) and maleic anhydride grafted polyphenylene ether (PPE-g-MAH) to graft modify LCP to improve the blowing film performance of LCP, but there are still problems of poor compatibility and uneven dispersion.

[0004] Even if PPE is under the action of compatibilizer PPE-g-MAH, the compatibility of PPE with the matrix resin LCP is still poor, and the modified sample can clearly distinguish the two substances macroscopically; at the same time, due to the poor compatibility and uneven dispersion, the modified LCP film forming property is poor, and in the blowing process, the film bubble is very easy to appear broken hole, resulting in continuous film blowing.

[0005] Therefore, a method is needed to improve the viscosity of LCP while solving the problems of poor compatibility and uneven dispersion of chain extender, compatibilizer and matrix resin LCP, so as to realize continuous film forming of modified LCP. SUMMARY

[0006] In order to overcome the problems existing in the prior art, one of the purposes of the present application is to provide a modified LCP material, which is modified by a specific chain extender, and the modified LCP material has high viscosity, good compatibility and good film forming property.

[0007] The second object of the present application is to provide a device for preparing the modified LCP material.

[0008] The third object of the present application is to provide a method for preparing the modified LCP material.

[0009] The fourth object of the present application is to provide an application of the modified LCP material in the field of electronic appliances, communication or aerospace.

[0010] In order to achieve the above objects, the technical scheme adopted by the present application is as follows:

[0011] The first aspect of the present application provides a modified LCP material, comprising the following preparation raw materials: a chain extender and an LCP resin; the chain extender is selected from an epoxy-based chain extender, and the epoxy-based chain extender contains two or more than two alicyclic epoxy groups.

[0012] Preferably, the mass percentage of the chain extender in the preparation raw materials of the modified LCP material is 0.1-2%; further preferably, 0.2-1.5%; and more preferably, 0.3-1%.

[0013] Preferably, in the chain extender, the epoxy-based chain extender is selected from an ADR chain extender; further preferably, the ADR chain extender comprises at least one of ADR-4468, ADR-4368CS, ADR-4370, ADR-4385, ADR-4380 or ADR-4300; and more preferably, the ADR chain extender comprises at least one of ADR-4468, ADR-4368CS or ADR-4370.

[0014] In some specific embodiments of the present application, the ADR chain extender is selected from ADR-4468.

[0015] The ADR-4468 chain extender is more likely to react with the hydroxyl or carboxyl groups of the LCP molecular backbone to form branches due to the presence of 9 alicyclic epoxy groups, thereby solving the problem of poor compatibility between the LCP resin and the chain extender, and further facilitating the tackifying modification of the LCP resin.

[0016] Preferably, in the chain extender, the acid anhydride compound is selected from a dianhydride compound; and further preferably, from phthalic anhydride.

[0017] Preferably, in the chain extender, the isocyanate is selected from a diisocyanate; and further preferably, from toluene diisocyanate.

[0018] Liquid crystal polymer is a high polymer that can exist in a liquid crystal phase under certain conditions, and it has the characteristics of both polymers and liquid crystals. According to the formation conditions of liquid crystals, it can be divided into thermotropic liquid crystal polymers (TLCP) and lyotropic liquid crystal polymers (LLCP).

[0019] Preferably, the LCP resin of the present application is selected from the group consisting of thermotropic liquid crystalline polymer (TLCP); further preferably, the LCP resin is selected from the group consisting of at least one of A950, R8000; more further preferably, the LCP resin is selected from the group consisting of at least one of Polyplastics A950, Celanes A950, Ticona A950 or Rikagaku R8000.

[0020] Preferably, the modified LCP material has a melt index of 0.1-1 g / 10 min at 285℃, 1.2 kg; further preferably, 0.2-0.8 g / 10 min.

[0021] Preferably, the modified LCP material has a viscosity of 10 5 ~ 10 9 mPa-s at 25℃, frequency of 0.01-100 / second; further preferably, 2x10 5 ~ 8x10 8 mPa-s.

[0022] The second aspect of the present application provides an apparatus for preparing the modified LCP material of the first aspect of the present application, the apparatus comprising a screw extrusion device, the screw extrusion device comprising meshing blocks, the meshing blocks being obtained by cross-laminating 4 or more strip-shaped meshing pieces, the included angle of every two adjacent meshing pieces being 30-60°

[0023] Preferably, the screw extrusion device comprises a twin-screw extruder or a single-screw extruder; more further preferably, a twin-screw extruder.

[0024] Preferably, the meshing block comprises 4-10 strip-shaped meshing pieces; further preferably, 4-6.

[0025] Preferably, the included angle of every two adjacent meshing pieces is 30-60°; further preferably, 40-50°.

[0026] Preferably, the screw extrusion device comprises 8-12 meshing blocks; further preferably, 8-10.

[0027] Preferably, the meshing blocks are connected with threaded conveying elements; further preferably, one threaded conveying element is connected between every two adjacent meshing blocks.

[0028] In some embodiments of the present application, the engagement blocks are obtained by cross-laminating 5 strip-shaped engagement pieces, the included angle between adjacent two engagement pieces is 45°, the screw has 9 engagement blocks, and one threaded conveying element is connected between every two engagement blocks. When this embodiment is used, the material flow is divided into two material flows every time when passing through one engagement piece, the screw fully mixes the material flow while rotating, and the material flow is divided into 2 45 material flows after passing through 45 engagement pieces of 9 engagement blocks, and good dispersion and mixing effects are achieved after multiple division and mixing. In addition, in order to prevent the material flow from staying for too long to cause gelation and caking, the threaded conveying element is embedded between the engagement blocks, so as to ensure that the chain extender has sufficient reaction time with the LCP resin, and at the same time, the molten material flow is conveyed forward.

[0029] The third aspect of the present application provides a preparation method of the modified LCP material of the first aspect of the present application, comprising the following steps: mixing the LCP resin and the chain extender and then performing extrusion granulation.

[0030] Preferably, in the preparation method, the mixing temperature of the LCP resin and the chain extender is 40-120℃; further preferably 50-110℃.

[0031] Preferably, in the preparation method, the mixing time of the LCP resin and the chain extender is 3-40min; further preferably 5-30min.

[0032] Preferably, in the preparation method, the extrusion granulation is performed in a screw extruder; further preferably a twin-screw extruder.

[0033] Preferably, the diameter of the screw of the screw extruder is 30-40mm.

[0034] Preferably, the length-diameter ratio of the screw of the screw extruder is 40-50.

[0035] Preferably, in the preparation method, the extrusion granulation comprises the following steps: plasticizing mixing, extrusion drawing and cooling and granulating.

[0036] Preferably, in the plasticizing mixing, the temperatures of the zones of the screw extruder are respectively 210-230℃, 225-245℃, 230-250℃, 250-270℃, 255-275℃, 260-280℃, 260-280℃, 260-280℃, 270-290℃ and 275-295℃.

[0037] Preferably, in the plasticizing mixing, the temperature of the die of the screw extruder is 275-295℃.

[0038] Preferably, in the plasticizing mixing, the rotation speed of the screw of the screw extruder is 130-140r / min.

[0039] Preferably, in the plasticizing mixing, the feeding rotation speed is 4-10 r / min.

[0040] Preferably, in the preparation method, the LCP resin and the chain extender are mixed and then subjected to twice extrusion granulation.

[0041] The twice extrusion granulation can make the LCP resin and the chain extender more fully mixed, the viscosity modification effect is better, and the film forming performance of the modified LCP material is better.

[0042] Preferably, in the preparation method, the extrusion granulation is performed in the device of the second aspect of the present application.

[0043] The fourth aspect of the present application provides an application of the modified LCP material of the first aspect of the present application in the field of electronic appliances, communication or aerospace.

[0044] Preferably, the communication field is the field of 5G communication; further preferably, the field of 5G communication is the field of antenna film materials for 5G communication.

[0045] The present application has the advantages that: the LCP resin is modified by using a specific chain extender, which improves the viscosity of the LCP material even without a compatibilizer, and solves the problems of poor compatibility and uneven dispersion of the chain extender and the matrix resin, and the film forming performance of the modified LCP material is good.

[0046] Specifically, compared with the prior art, the present application has the following advantages:

[0047] 1. In the chain extender used in the present application, the epoxy chain extender contains two or more than two alicyclic epoxy groups, so it is easier to react with the hydroxyl or carboxyl groups in the main chain of the LCP molecule to form a branched chain, thereby solving the compatibility problem, improving the viscosity of the LCP material, and solving the problems of poor compatibility and uneven dispersion of the chain extender and the matrix resin.

[0048] 2. The device provided by the present application uses a specific composition of the meshing block, which is combined with the threaded conveying element and has the characteristics of low shear and strong mixing, which can improve the dispersion and mixing effect of the chain extender and the resin matrix, and at the same time prevent the gel from being formed due to the long residence time of the material flow, and the conveying element is embedded between the meshing block assemblies to ensure that the chain extender and the LCP have sufficient reaction time, and at the same time the molten material flow is forwarded.

[0049] 3. The modified LCP material obtained by the present application has high viscosity, good compatibility between raw materials, and good film forming performance, and has wide application in the fields of electronic appliances, communication, aerospace. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 Schematic diagram of screw structure of screw extruder in the embodiment.

[0051] Figure 2 Schematic diagram of meshing block of screw extruder in the embodiment.

[0052] Figure 3 Schematic diagram of screw thread conveying element of screw extruder in the embodiment.

[0053] Figure 4 LCP material viscosity change graph of Example 1, Comparative Example 1 and Comparative Example 2.

[0054] Figure 5 Actual picture when carrying out blown film experiment on LCP material of Example 1.

[0055] Figure 6 Actual picture when carrying out blown film experiment on LCP material of Example 2.

[0056] Figure 7 Actual picture when carrying out blown film experiment on LCP material of Comparative Example 2 Figure 1 .

[0057] Figure 8 Actual picture when carrying out blown film experiment on LCP material of Comparative Example 2 Figure 2 . DETAILED DESCRIPTION

[0058] The content of the present application will be further illustrated in detail through specific embodiments. It should also be understood that the following embodiments are only used to further illustrate the present application and cannot be understood as a limitation on the protection scope of the present application. Some non-essential improvements and adjustments made by those skilled in the art according to the principles set forth in the present application are within the protection scope of the present application. The specific process parameters in the following examples are only one example in the appropriate range, i.e. those skilled in the art can make appropriate selection within the appropriate range through the description herein, and are not limited to the specific data in the following examples. The raw materials, reagents or devices used in the following examples and comparative examples are commercially available or can be obtained by known methods unless otherwise specified.

[0059] In some embodiments of the present application, the meshing block and the conveying element are commercially available products and are assembled by themselves. The manufacturer is Nanjing Xie Xin and the model is 45° / 5 / 16.

[0060] In some embodiments of the present application, the preparation method of the modified LCP comprises the following steps: a) raw material compounding; b) plasticizing mixing; c) extruding and drawing; and d) cooling and granulating.

[0061] The specific steps are as follows:

[0062] Step a) raw material compounding, 0.05-1 parts of chain extender, 99-99.95 parts of LCP resin are weighed by weight parts, the chain extender used is selected from ADR-4468; the LCP resin is selected from Polyplastics A950 or Celanes A950 LCP particles; the chain extender ADR4468 and the LCP resin particles are placed in a high-speed mixer, and are mixed at 50-110°C for 5-30 min to obtain a mixture;

[0063] Step b) plasticizing mixing, the mixture prepared in the above step is placed in the hopper of a double-screw extruder with a screw diameter of 35 mm and a screw length-diameter ratio of 44, the temperature of each zone of the extruder and the die temperature are set to 220°C, 235°C, 240°C, 260°C, 265°C, 270°C, 270°C, 270°C, 280°C, 285°C, and 285°C, respectively, the feeding speed is 6 r / min, and the screw speed is 135 r / min, and the mixture is plasticized and mixed to obtain a molten material with uniform dispersion of the chain extender. The screw combination adopts two types of screw elements, i.e., conveying elements and meshing blocks, which have the characteristics of low shear and strong mixing. In order to improve the dispersion and mixing effect of the chain extender and the resin matrix, 9 meshing block assemblies are used in the screw combination (as shown in Figure 1 , 4, 2, and 3 meshing block assemblies are used in zones ①, ②, and ③, respectively, a is a meshing block, and b is a threaded conveying element), as shown in Figure 2 , each meshing block is composed of 5 meshing pieces arranged at an angle of 45°, and when the material flow passes through each meshing piece, it is divided into two material flows. The screw rotates at the same time to fully mix the material flow. After passing through 9 meshing blocks, i.e., 45 meshing pieces, the material flow is divided into 2 45 material flows. After multiple division and mixing, a good dispersion and mixing effect is achieved. At the same time, in order to prevent the material from staying for too long and causing gelation and caking, threaded conveying elements (as shown in Figure 3 ) are embedded between the meshing block assemblies to ensure sufficient reaction time of the chain extender and the LCP, and at the same time, the molten material is conveyed forward;

[0064] Step c) extrusion drawing, under the extrusion force of the extruder, the molten material is extruded outward through the cylindrical hole on the die, and at the same time, under the action of the pulling force, a continuous cylindrical long strip is formed;

[0065] Step d) cooling and granulation, the cylindrical long strip is cooled to an appropriate temperature in a cooling water tank and then enters a granulator for granulation to obtain modified LCP particles 1, i.e., the modified LCP material.

[0066] In some other embodiments of the present application, the preparation method of the modified LCP comprises the following steps: a) raw material compounding; b) plasticizing mixing; c) extrusion drawing; d) cooling and granulation; and e) secondary extrusion granulation.

[0067] The specific steps are as follows:

[0068] The specific steps of steps a) to d) are the same as those in the foregoing examples.

[0069] Step e) secondary extrusion granulation, repeating steps b), c) and d) on the modified LCP granules 1 to obtain modified LCP granules 2, i.e. the modified LCP material.

[0070] In some embodiments of the present application, the LCP is commercially available A950, specifically Polyplastics A950, Celanes A950, Ticona A950, and the commercially available A950 does not add a chain extender, and its melt index is 1.9 g / 10 min (285℃, 1.2 kg), and its viscosity range is 1×10 5 ~ 7×10 8 mPa·s (0.01 Hz-100 Hz).

[0071] In some embodiments of the present application, the use of a specific screw combination can improve the dispersion effect of the chain extender in the LCP matrix. The modified LCP material prepared by ordinary twin-screw extrusion has a relatively weak dispersion effect compared to the specific screw combination described in the embodiments of the present application, which causes poor dispersion of the chain extender in the LCP resin and easy occurrence of gel-like phenomenon, resulting in intermittent broken holes in the film blowing process of the modified LCP and inability to continuously form a film.

[0072] In some embodiments of the present application, the addition of the chain extender affects the melt index and viscosity of the LCP. The ADR-4468 chain extender can increase the viscosity of the LCP resin and reduce the melt index of the LCP resin, while the TDE-85 chain extender can instead reduce the viscosity of the LCP resin and increase the melt index of the LCP resin. Therefore, the use of an epoxy chain extender containing two or more alicyclic epoxy groups in the embodiments of the present application can increase the viscosity of the LCP resin and reduce the melt index of the LCP resin, thereby obtaining a modified LCP material with good film forming performance.

[0073] Example 1

[0074] This example provides a method for preparing a modified LCP material, specifically comprising the following steps:

[0075] 0.7 parts of chain extender ADR-4468 and 99.3 parts of A950 LCP are placed in a high-speed mixer and mixed at 50-110°C for 5-30 min, and then the mixed material is poured out and placed in the hopper of a twin-screw extruder with a low-shear strong dispersion screw combination. The temperature of each zone of the extruder and the temperature of the die are set to 220°C, 235°C, 240°C, 260°C, 265°C, 270°C, 270°C, 270°C, 280°C, 285°C, and 285°C, respectively. The feeding speed is 6 r / min, and the screw speed is 135 r / min. The mixed material is melt plasticized and granulated to obtain modified LCP granules 1. Then the modified LCP 1 is placed in the hopper of the twin-screw extruder and extruded and granulated again under the same process parameters to obtain modified LCP granules 2, i.e., the modified LCP material.

[0076] Example 2

[0077] The example provides a preparation method of a modified LCP material, which specifically includes the following steps:

[0078] 0.5 parts of chain extender ADR-4468 and 99.5 parts of A950 LCP are placed in a high-speed mixer and mixed at 50-110°C for 5-30 min, and then the mixed material is poured out and placed in the hopper of a twin-screw extruder with a low-shear strong dispersion screw combination. The temperature of each zone of the extruder and the temperature of the die are set to 220°C, 235°C, 240°C, 260°C, 265°C, 280°C, 280°C, 280°C, 285°C, 285°C, and 285°C, respectively. The feeding speed is 6 r / min, and the screw speed is 135 r / min. The mixed material is melt plasticized and granulated to obtain modified LCP granules 1, i.e., the modified LCP material.

[0079] Comparative Example 1

[0080] The example provides a preparation method of a modified LCP material, which specifically includes the following steps:

[0081] The pure A950 LCP granules are placed in the hopper of a twin-screw extruder with a low-shear strong dispersion screw combination. The temperature of each zone of the extruder and the temperature of the die are set to 220°C, 235°C, 240°C, 260°C, 265°C, 270°C, 270°C, 270°C, 280°C, 285°C, and 285°C, respectively. The feeding speed is 6 r / min, and the screw speed is 135 r / min. The pure A950 LCP is melt plasticized and granulated to obtain the LCP material.

[0082] Comparative Example 2

[0083] The example provides a preparation method of a modified LCP material, which specifically includes the following steps:

[0084] 0.7 parts of chain extender TDE-85 (4,5-epoxyhexane-1,2-dicarboxylic acid diglycidyl ester) and 99.3 parts of A950 LCP were placed in a high-speed mixer, mixed at 50-110°C for 5-30 min, and then the mixture was poured out and placed in the hopper of a twin-screw extruder with a low-shear strong dispersion screw combination. The temperatures of the zones of the extruder and the temperature of the die were set to 220°C, 235°C, 240°C, 260°C, 265°C, 270°C, 270°C, 270°C, 280°C, 285°C, and 285°C, respectively. The feeding speed was 6 r / min, and the screw speed was 135 r / min. The mixture was melt plasticized and granulated to obtain the modified LCP material.

[0085] Performance test

[0086] 1) The current of the extruder during granulation was recorded. The current of the extruder could reflect the energy consumption of the material during plasticization in the twin-screw extruder, and indirectly reflect the increase in the viscosity of the modified material. Under the same process parameters (barrel temperature, screw speed, and feeding speed), the molecular chain of LCP was increased due to the introduction of the chain extender for block or grafting, so that more energy was required for the molecular chain to flow during melt plasticization, that is, the larger the current of the extruder, the greater the viscosity of the material.

[0087] 2) The melt index of the material at 285°C under 1.2 kg was tested.

[0088] 3) The change in the viscosity of the material at 285°C was determined by a rotary rheometer.

[0089] 4) A film blowing experiment was performed to test the film forming performance of the material.

[0090] The results are recorded in Table 1.

[0091] Table 1: Performance test results of the material

[0092]

[0093] Note: “0” represents the viscosity change reference, “+” represents the increase in viscosity, and “-” represents the decrease in viscosity.

[0094] Comparative Example 1 was not modified by adding a chain extender, and was LCP resin pure material. Comparative Example 1 was used as a viscosity change reference group. The viscosity change graphs of the LCP materials of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Figure 4 Figure 1. The viscosity of the modified LCP material of Example 1 at 25°C and a frequency of 0.01-100 / second was 2x10 5 -8x10 8mPa-s, while the viscosity of the modified LCP material of Comparative Example 2 is in the range of 7 x 10 4 ~ 1.2 x 10 8 mPa-s, and the viscosity of Comparative Example 2 is smaller at the same frequency. It can be seen that the use of the ADR chain extender of Example 1 can increase the viscosity of the LCP material, while the use of the TDE chain extender containing an epoxy group, due to only one alicyclic epoxy group, has a poor modification effect on the LCP material and cannot increase the viscosity of the LCP material.

[0095] Figure 5 a physical picture of the blown film experiment of the LCP material of Example 1, Figure 6 a physical picture of the blown film experiment of the LCP material of Example 2, Figure 7 and Figure 8 a physical picture of the blown film experiment of the LCP material of Comparative Example 2 Figure 1 and a physical picture of the blown film experiment of the LCP material of Comparative Example 2 Figure 2 It can be seen that, in the blown film process, the LCP film of Example 1 is smooth without a broken hole, and the modified LCP of Example 1 has good film-forming performance; the LCP film of Example 2 has a broken hole, but the degree of the broken hole is small, and the modified LCP of Example 1 has certain film-forming performance; the LCP film of Comparative Example 2 has a large broken hole, and the modified LCP material of Comparative Example 2 has poor film-forming performance.

[0096] From the comparison of Figure 5 and Figure 7 , 8 , Figure 5 the LCP film of Example 1 in the middle has no broken hole, and the cylindrical film bubble is stable and flat in shape; while Figure 7 and Figure 8 the LCP film of Comparative Example 2 has a broken hole, and the cylindrical film bubble is extremely unstable and wobbles in shape.

[0097] While Figure 6 the LCP film of Example 2 has a broken hole, but the degree of the broken hole is small, which does not affect the film-forming performance of the material, and the cylindrical film bubble is stable and flat in shape.

[0098] In the examples of the present application, the modified LCP material which is granulated only once is intermittently broken in the blown film experiment, which is mainly caused by the gel phenomenon due to the uneven dispersion of the chain extender in the LCP matrix, and under the same process conditions in the blown film process, the unfused material exists in the place with the gel, causing the film bubble to leak.

[0099] It can be seen that the LCP resin is modified by using the specific chain extender, the viscosity of the LCP material is improved even without the need of a compatibilizer, meanwhile, the problems of poor compatibility and uneven dispersion of the chain extender and the base resin are solved, and the film forming property of the modified LCP material is good; the LCP material obtained by the screw extruder with the specific structure of the engaging block and the threaded conveying element is fully mixed, which is beneficial to improve the dispersion degree of the material.

[0100] The embodiment of the application adopts the specific chain extender, combines the specific screw combination and the extrusion granulation process, even without using the compatibilizer, the viscosity of the LCP is improved, meanwhile, the problems of poor compatibility and uneven dispersion of the chain extender and the base resin are solved, and the continuous film forming of the modified LCP material is realized. The modified LCP material obtained by the application has high viscosity, good compatibility between raw materials, and good film forming property, and has a wide application in the fields of electronic appliances, communication, aerospace, etc.

Claims

1. A modified LCP material, characterized in that, The preparation materials include the following: chain extender and LCP resin; the chain extender is selected from epoxy chain extenders, which contain two or more alicyclic epoxy groups; the chain extender has a mass percentage of 0.1-2% in the preparation materials; the epoxy chain extender is selected from ADR chain extenders; the ADR chain extender includes ADR... 4468, ADR 4368CS, ADR 4370, ADR 4385, ADR 4380 or ADR At least one of 4300; the LCP resin is selected from thermotropic liquid crystal polymers.

2. The modified LCP material according to claim 1, characterized in that, The thermotropic liquid crystal polymer is selected from at least one of A950 and R8000.

3. The modified LCP material according to claim 2, characterized in that, The thermotropic liquid crystal polymer is selected from at least one of Polyplastics A950, Celanes A950, Ticona A950, or Golden R8000.

4. The method for preparing the modified LCP material according to any one of claims 1 to 3, characterized in that, Includes the following steps: The LCP resin and chain extender are mixed and then extruded and granulated.

5. The preparation method according to claim 4, characterized in that, The extrusion granulation is carried out in an apparatus for preparing the modified LCP material; the apparatus includes a screw extrusion unit, the screw extrusion unit includes a meshing block, the meshing block is formed by four or more strip-shaped meshing plates stacked crosswise, and the included angle between each two adjacent meshing plates is 30~60°.

6. The preparation method according to claim 5, characterized in that, The device includes 8 to 12 meshing blocks.

7. The preparation method according to claim 5, characterized in that, A threaded conveying element is connected between the meshing blocks.

8. The application of the modified LCP material according to any one of claims 1 to 3 in the fields of electronics, communications or aerospace.

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