WO2022042412A1 - Liquid crystal polymer film for 5g communication flexible copper clad laminate and preparation method therefor - Google Patents

Liquid crystal polymer film for 5g communication flexible copper clad laminate and preparation method therefor Download PDF

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WO2022042412A1
WO2022042412A1 PCT/CN2021/113449 CN2021113449W WO2022042412A1 WO 2022042412 A1 WO2022042412 A1 WO 2022042412A1 CN 2021113449 W CN2021113449 W CN 2021113449W WO 2022042412 A1 WO2022042412 A1 WO 2022042412A1
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liquid crystal
crystal polymer
polymer film
copper clad
flexible copper
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PCT/CN2021/113449
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French (fr)
Chinese (zh)
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胡新利
郭建君
虞成城
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深圳市信维通信股份有限公司
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Publication of WO2022042412A1 publication Critical patent/WO2022042412A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/542—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • C09K19/0233—Electroclinic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3804—Polymers with mesogenic groups in the main chain
    • C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides

Definitions

  • the invention relates to the technical field of polymer materials, in particular to a liquid crystal polymer film used for a 5G communication flexible copper clad laminate and a preparation method thereof.
  • Liquid crystal polymer commonly known as Liquid Crystal Polymer (LCP)
  • LCP Liquid Crystal Polymer
  • the requirements for low-dielectric materials are getting higher and higher, especially in the field of antennas and signal transmission lines, the requirements for low-dielectric films are also getting higher and higher.
  • polyimide films or modified polyimide films are mostly used, but at high frequencies, polyimide films or modified polyimide films show higher dielectric properties, and are subject to limit.
  • the liquid crystal polymer film has high expectations due to its low water absorption and low dielectric properties.
  • the liquid crystal polymer film is mainly prepared by blow molding, but the liquid crystal polymer film blowing process requires special die design in order to reduce the anisotropy of the film, and the process is very complicated.
  • lyotropic liquid crystal polymers can be prepared by coating method, the process is simple, and the anisotropy difference of the prepared films is very small.
  • the anisotropy of the films prepared by the coating method of lyotropic liquid crystal polymers is small, the dielectric properties still cannot meet the application requirements.
  • reducing the dielectric properties requires adding some low-dielectric fillers, such as low-dielectric glass fibers, glass microspheres, and polytetrafluoroethylene.
  • the addition of glass fibers increases the anisotropy of liquid crystal polymer films, while roughening the film surface.
  • the addition of ordinary glass microspheres will roughen the surface of the film and even affect the strength of the film.
  • PTFE filler can reduce the dielectric properties of the film, most of the commercially available PTFE fillers have larger particle sizes, and the use of commercially available PTFE fillers will make the surface of the film rough. When compounding with copper foil to prepare a flexible copper clad laminate, it will ultimately affect the performance of the copper clad laminate.
  • the technical problem to be solved by the present invention is to provide a liquid crystal polymer film for a 5G communication flexible copper clad laminate and a preparation method thereof, which can prepare a liquid crystal polymer film with a low dielectric constant and a smooth surface.
  • the technical scheme adopted in the present invention is:
  • a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate The polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and pulverization to obtain polytetrafluoroethylene powder; the liquid crystal polymer solution is mixed with the polytetrafluoroethylene. The powders are mixed to obtain a mixture; the mixture is coated on a substrate, and then annealed to obtain the liquid crystal polymer film.
  • a liquid crystal polymer film for a 5G communication flexible copper clad laminate is prepared according to the method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate.
  • liquid nitrogen freezing and pulverizing polytetrafluoroethylene can obtain polytetrafluoroethylene powder with smaller particle size and more uniform, and after mixing with the liquid crystal polymer solution, it can be prepared to obtain lower dielectric constant, The liquid crystal polymer film with lower dielectric loss, smooth surface and certain mechanical strength; the prepared liquid crystal polymer film is suitable for high frequency and high speed flexible copper clad laminates.
  • liquid nitrogen freezing pulverization of polytetrafluoroethylene can obtain polytetrafluoroethylene powder with smaller particle size and more uniformity, and after mixing with liquid crystal polymer solution, a lower dielectric constant can be prepared , Liquid crystal polymer film with low dielectric loss, smooth surface and certain mechanical strength.
  • a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate The polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and pulverization to obtain polytetrafluoroethylene powder; the liquid crystal polymer solution is mixed with the polytetrafluoroethylene. The powders are mixed to obtain a mixture; the mixture is coated on a substrate, and then annealed to obtain the liquid crystal polymer film.
  • the beneficial effect of the present invention is that: the polytetrafluoroethylene powder with smaller and more uniform particle size can be obtained by freezing and pulverizing the polytetrafluoroethylene in liquid nitrogen, and the obtained polytetrafluoroethylene powder can be further classified After screening and mixing with the liquid crystal polymer solution, a liquid crystal polymer film with lower dielectric constant, lower dielectric loss, smooth surface and certain mechanical strength can be prepared; the prepared liquid crystal polymer film is suitable for high frequency and high speed. Flexible CCL.
  • the particle size D90 of the polytetrafluoroethylene powder is less than 10 ⁇ m.
  • the particle size of the polytetrafluoroethylene powder used is small, which is beneficial to obtain a liquid crystal polymer film with a smooth surface.
  • the viscosity of the liquid crystal polymer solution is 3000-30000 mPa ⁇ s.
  • the solvent of the liquid crystal polymer solution is 1-methyl-2-pyrrolidone.
  • the viscosity of the liquid crystal polymer solution can be adjusted by adjusting the solvent content.
  • the temperature of the annealing treatment is 250-310° C., and the time is 2-8 h.
  • the annealing treatment can remove the solvent in the liquid crystal polymer solution.
  • the weight part of the liquid crystal polymer solution in the mixture is 90-110 parts, and the weight part of the polytetrafluoroethylene powder is 10-100 parts.
  • the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing pulverization by a liquid nitrogen freezing mill.
  • the coating film thickness during coating is 5-30 ⁇ m.
  • a liquid crystal polymer film for a 5G communication flexible copper clad laminate is prepared according to the method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate.
  • Embodiment 1 of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, comprising the following steps:
  • the polytetrafluoroethylene raw material is frozen and pulverized in liquid nitrogen to obtain polytetrafluoroethylene powder.
  • the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and crushing by a liquid nitrogen freezing grinder.
  • a certain amount of polytetrafluoroethylene raw material can be added to the liquid nitrogen freezing grinder, and a The zirconia beads were ground.
  • PTFE powder with different particle sizes can be obtained.
  • grinding for 1.5h can obtain PTFE powder with D90 of 5 ⁇ m
  • grinding for 1h can obtain PTFE powder with D90 of 9 ⁇ m
  • grinding for 20min can obtain PTFE powder with D90 of 15 ⁇ m.
  • the particle size D90 of the polytetrafluoroethylene powder used is less than 10 ⁇ m.
  • the particle size of the polytetrafluoroethylene powder can be tested by a laser particle size analyzer.
  • the average particle size D90 of the polytetrafluoroethylene raw material in this example is 1000 ⁇ m, which can be purchased from Central Glass Company.
  • the viscosity of the liquid crystal polymer solution is 3000-30000 mPa ⁇ s
  • the solvent of the liquid crystal polymer solution is 1-methyl-2-pyrrolidone
  • the liquid crystal polymer solution is model VR300 purchased from Sumitomo Chemical Co., Ltd.
  • the weight part of the liquid crystal polymer solution in the mixture is 90-110 parts
  • the weight part of the polytetrafluoroethylene powder is 10-100 parts.
  • the thickness of the coating film during coating is 5 to 30 ⁇ m.
  • the temperature of the annealing treatment is 250-310° C., and the time is 2-8 hours.
  • the second embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
  • step 2 the viscosity of the liquid crystal insulating polymer solution used is 15000 mPa ⁇ s, and the weight part of the liquid crystal polymer solution is 100 parts; the particle size D90 of the polytetrafluoroethylene powder used is 5 ⁇ m, and the dosage is 67 parts.
  • step 3 the thickness of the coating film is 15 ⁇ m, the temperature of the annealing treatment is 280° C., and the time is 2 h.
  • the third embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m, and the dosage is 11 parts.
  • the fourth embodiment of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m.
  • the fifth embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m, and the dosage is 100 parts.
  • the sixth embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
  • step 2 the viscosity of the liquid crystal insulating polymer solution used is 3000 mPa ⁇ s, and the weight part of the liquid crystal polymer solution is 90 parts; the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m, and the dosage is 10 parts.
  • step 3 the thickness of the coating film is 5 ⁇ m, the temperature of the annealing treatment is 250° C., and the time is 8 h.
  • the seventh embodiment of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
  • step 2 the viscosity of the liquid crystal insulating polymer solution used is 30000 mPa ⁇ s, and the weight part of the liquid crystal polymer solution is 110 parts; the particle size D90 of the polytetrafluoroethylene powder used is 5 ⁇ m, and the dosage is 20 parts.
  • step 3 the thickness of the coating film is 30 ⁇ m, the temperature of the annealing treatment is 310° C., and the time is 2 h.
  • Comparative Example 1 of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m, and the dosage is 5 parts.
  • the second comparative example of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second example in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 9 ⁇ m, and the dosage is 120 parts.
  • Comparative Example 3 of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
  • step 2 the particle size D90 of the polytetrafluoroethylene powder used is 15 ⁇ m.
  • Comparative Example 4 of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
  • step 2 the polytetrafluoroethylene raw material that has not been frozen and pulverized by liquid nitrogen is used.
  • the liquid crystal polymer film was cut into a square of 80 mm ⁇ 80 mm, and the dielectric constant and dielectric loss were measured.
  • the test method is the resonant cavity method.
  • a network analyzer model E5071, a split dielectric resonator (SPDR) jig, manufactured by Keysight Corporation was used as the test equipment.
  • the test of dielectric constant and dielectric loss is the data at high frequency 10GHz. Among them, a dielectric constant of 3.0 or less is good, and a dielectric constant of 3.0 or more is poor.
  • the liquid crystal polyester film was cut into a Type-5 dumbbell shape with a cutter, and the tensile strength and elongation at break were measured.
  • As the test equipment a C45.102 electronic universal testing machine manufactured by Shinsansi Co., Ltd. was used. The tensile strength and elongation at break of the sample at break were obtained by pulling the sample at a speed of 10 mm/min using a tensile tester.
  • the liquid crystal polymer film was cut into a 5mm ⁇ 5mm square spline with a cutter to test the surface linear roughness of the sample.
  • a surface roughness meter SJ-410 manufactured by Mitutoyo Corporation was used as a test apparatus. The number of test points is 10, by calculating the average linear surface roughness Rz of 10 points on a line. Among them, Rz of 4 or less is good, Rz of 4 to 5 is good, and Rz of 5 or more is bad. In addition, it is not good if there are obvious agglomerates on the surface.
  • Example 3 and Example 4 From Table 1, it can be seen from the test results of Example 3 and Example 4 that within a certain range, as the content of PTFE increases, the dielectric properties of the liquid crystal polymer film are better. It can be seen from the test results of Comparative Example 1 that when the content of PTFE is too low, the purpose of improving the dielectric properties cannot be achieved; from the test results of Comparative Example 2, it can be seen that when the content of PTFE is too high, There will be agglomeration, and the appearance will not meet the requirements.
  • Example 2 By comparing the test data of Example 2 and Example 4, it can be seen that when the particle size D90 of the polytetrafluoroethylene powder is below 10 ⁇ m, the particle size has little effect on the dielectric properties and appearance of the liquid crystal polymer film. By comparing the test data of Example 3, it can be seen that when the particle size of the PTFE powder used is larger, agglomeration will occur, and the appearance cannot meet the requirements.
  • a liquid crystal polymer film for a 5G communication flexible copper clad laminate and a preparation method thereof provided by the present invention can be prepared to obtain a lower dielectric constant, a lower dielectric loss, a smooth surface, and a certain mechanical strength
  • the liquid crystal polymer film prepared; the prepared liquid crystal polymer film is suitable for high frequency and high speed flexible copper clad laminates.

Abstract

Disclosed in the present invention are a liquid crystal polymer film for a 5G communication flexible copper clad laminate and a preparation method therefor. The preparation method comprises: freezing and pulverizing a polytetrafluoroethylene raw material with liquid nitrogen to obtain polytetrafluoroethylene powder; mixing a liquid crystal polymer solution with the polytetrafluoroethylene powder to obtain a mixture; and coating a substrate with the mixture and then carrying out annealing to obtain the liquid crystal polymer film. According to the present invention, a liquid crystal polymer film having a low dielectric constant, a low dielectric loss, a smooth surface, and a certain mechanical strength can be prepared, and the prepared liquid crystal polymer film is suitable for high-frequency and high-speed flexible copper clad laminates.

Description

用于5G通信柔性覆铜板的液晶聚合物薄膜及其制备方法Liquid crystal polymer film for 5G communication flexible copper clad laminate and preparation method thereof 技术领域technical field
本发明涉及高分子材料技术领域，尤其涉及一种用于5G通信柔性覆铜板的液晶聚合物薄膜及其制备方法。The invention relates to the technical field of polymer materials, in particular to a liquid crystal polymer film used for a 5G communication flexible copper clad laminate and a preparation method thereof.
背景技术Background technique
液晶聚合物，一般称之为液晶高分子(Liquid Crystal Polymer，LCP)，由于分子结构特殊性，具有优良的机械性能、加工性能、高尺寸稳定性、耐高低温性能、耐化学腐蚀、自增强、自阻燃及电绝缘性能。因为这些优异的性能，目前在电子电器、OA部品和耐热食器等领域广泛使用。Liquid crystal polymer, commonly known as Liquid Crystal Polymer (LCP), has excellent mechanical properties, processing properties, high dimensional stability, high and low temperature resistance, chemical corrosion resistance, and self-reinforcing due to the particularity of its molecular structure. , Self-flammability and electrical insulation properties. Because of these excellent properties, it is widely used in the fields of electronic appliances, OA parts and heat-resistant food utensils.
目前由于5G的发展，对低介电材料的要求也越来越高，尤其是在天线和信号传输线领域，对低介电的薄膜要求也越来越高。目前使用较多的是聚酰亚胺薄膜或改性聚酰亚胺薄膜，但在高频下，聚酰亚胺薄膜或改性聚酰亚胺薄膜表现出较高的介电性能，使用受到限制。而液晶聚合物薄膜由于其较低的吸水性，较低的介电性能，被寄予厚望。目前液晶聚合物薄膜主要通过吹塑成型的方式制备，但液晶聚合物吹塑薄膜工艺，为了减小薄膜的各项异性，需要特殊模头设计，工艺十分复杂。针对吹塑薄膜的不足，溶致型液晶聚合物可通过涂覆的方式方法制备，工序简单，且制备出的薄膜各项异性差异极小。At present, due to the development of 5G, the requirements for low-dielectric materials are getting higher and higher, especially in the field of antennas and signal transmission lines, the requirements for low-dielectric films are also getting higher and higher. At present, polyimide films or modified polyimide films are mostly used, but at high frequencies, polyimide films or modified polyimide films show higher dielectric properties, and are subject to limit. The liquid crystal polymer film has high expectations due to its low water absorption and low dielectric properties. At present, the liquid crystal polymer film is mainly prepared by blow molding, but the liquid crystal polymer film blowing process requires special die design in order to reduce the anisotropy of the film, and the process is very complicated. In view of the deficiencies of blown films, lyotropic liquid crystal polymers can be prepared by coating method, the process is simple, and the anisotropy difference of the prepared films is very small.
溶致型液晶聚合物通过涂覆方法制备出的薄膜虽然各项异性差异很小，但是介电性还是不能很好地满足使用需求。通常降低介电性需要加入一些低介电的填料，像低介电玻璃纤维、玻璃微球和聚四氟乙烯等。但一般来讲，玻璃纤维的添加会增加液晶聚合物薄膜的各项异性，同时使薄膜表面变得粗糙。普通的玻璃微球的添加会使薄膜表面变得粗糙，甚至影响薄膜的强度。聚四氟乙烯填料的添加虽然可以降低薄膜的介电性，但市场上市贩型聚四氟乙烯填料大多粒径较大，使用市贩聚四氟乙烯填料会使薄膜的表面变得粗糙，后续与铜箔进行复合制备柔性覆铜板时，会最终影响覆铜板的性能。Although the anisotropy of the films prepared by the coating method of lyotropic liquid crystal polymers is small, the dielectric properties still cannot meet the application requirements. Usually, reducing the dielectric properties requires adding some low-dielectric fillers, such as low-dielectric glass fibers, glass microspheres, and polytetrafluoroethylene. In general, however, the addition of glass fibers increases the anisotropy of liquid crystal polymer films, while roughening the film surface. The addition of ordinary glass microspheres will roughen the surface of the film and even affect the strength of the film. Although the addition of PTFE filler can reduce the dielectric properties of the film, most of the commercially available PTFE fillers have larger particle sizes, and the use of commercially available PTFE fillers will make the surface of the film rough. When compounding with copper foil to prepare a flexible copper clad laminate, it will ultimately affect the performance of the copper clad laminate.
技术问题technical problem
本发明所要解决的技术问题是：提供一种用于5G通信柔性覆铜板的液晶聚合物薄膜及其制备方法，可制备得到介电常数低且表面光滑的液晶聚合物薄膜。The technical problem to be solved by the present invention is to provide a liquid crystal polymer film for a 5G communication flexible copper clad laminate and a preparation method thereof, which can prepare a liquid crystal polymer film with a low dielectric constant and a smooth surface.
技术解决方案technical solutions
为了解决上述技术问题，本发明采用的技术方案为：In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:
一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，将聚四氟乙烯原料进行液氮冷冻粉碎，得到聚四氟乙烯粉料；将液晶聚合物溶液与所述聚四氟乙烯粉料进行混合，得到混合物；将所述混合物涂覆于基材上，然后进行退火处理，得到所述液晶聚合物薄膜。A method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate. The polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and pulverization to obtain polytetrafluoroethylene powder; the liquid crystal polymer solution is mixed with the polytetrafluoroethylene. The powders are mixed to obtain a mixture; the mixture is coated on a substrate, and then annealed to obtain the liquid crystal polymer film.
本发明采用的另一技术方案为：Another technical scheme adopted by the present invention is:
一种用于5G通信柔性覆铜板的液晶聚合物薄膜，根据所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法制备而成。A liquid crystal polymer film for a 5G communication flexible copper clad laminate is prepared according to the method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate.
有益效果beneficial effect
本发明的有益效果在于：对聚四氟乙烯进行液氮冷冻粉碎可以得到粒径更小且更加均匀的聚四氟乙烯粉末，与液晶聚合物溶液混合后，可以制备得到较低介电常数、较低介电损耗且表面光滑、具有一定力学强度的液晶聚合物薄膜；制备得到的液晶聚合物薄膜适用于高频高速柔性覆铜板。The beneficial effects of the present invention are: liquid nitrogen freezing and pulverizing polytetrafluoroethylene can obtain polytetrafluoroethylene powder with smaller particle size and more uniform, and after mixing with the liquid crystal polymer solution, it can be prepared to obtain lower dielectric constant, The liquid crystal polymer film with lower dielectric loss, smooth surface and certain mechanical strength; the prepared liquid crystal polymer film is suitable for high frequency and high speed flexible copper clad laminates.
本发明的实施方式Embodiments of the present invention
为详细说明本发明的技术内容、所实现目的及效果，以下结合实施方式予以说明。In order to describe in detail the technical content, achieved objects and effects of the present invention, the following descriptions are given in conjunction with the embodiments.
本发明最关键的构思在于：对聚四氟乙烯进行液氮冷冻粉碎可以得到粒径更小且更加均匀的聚四氟乙烯粉末，与液晶聚合物溶液混合后，可以制备得到较低介电常数、较低介电损耗且表面光滑、具有一定力学强度的液晶聚合物薄膜。The key idea of the present invention is that: liquid nitrogen freezing pulverization of polytetrafluoroethylene can obtain polytetrafluoroethylene powder with smaller particle size and more uniformity, and after mixing with liquid crystal polymer solution, a lower dielectric constant can be prepared , Liquid crystal polymer film with low dielectric loss, smooth surface and certain mechanical strength.
一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，将聚四氟乙烯原料进行液氮冷冻粉碎，得到聚四氟乙烯粉料；将液晶聚合物溶液与所述聚四氟乙烯粉料进行混合，得到混合物；将所述混合物涂覆于基材上，然后进行退火处理，得到所述液晶聚合物薄膜。A method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate. The polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and pulverization to obtain polytetrafluoroethylene powder; the liquid crystal polymer solution is mixed with the polytetrafluoroethylene. The powders are mixed to obtain a mixture; the mixture is coated on a substrate, and then annealed to obtain the liquid crystal polymer film.
从上述描述可知，本发明的有益效果在于：对聚四氟乙烯进行液氮冷冻粉碎可以得到粒径更小且更加均匀的聚四氟乙烯粉末，对得到的聚四氟乙烯粉末可以进一步进行分级筛选，与液晶聚合物溶液混合后，可以制备得到较低介电常数、较低介电损耗且表面光滑、具有一定力学强度的液晶聚合物薄膜；制备得到的液晶聚合物薄膜适用于高频高速柔性覆铜板。It can be seen from the above description that the beneficial effect of the present invention is that: the polytetrafluoroethylene powder with smaller and more uniform particle size can be obtained by freezing and pulverizing the polytetrafluoroethylene in liquid nitrogen, and the obtained polytetrafluoroethylene powder can be further classified After screening and mixing with the liquid crystal polymer solution, a liquid crystal polymer film with lower dielectric constant, lower dielectric loss, smooth surface and certain mechanical strength can be prepared; the prepared liquid crystal polymer film is suitable for high frequency and high speed. Flexible CCL.
进一步的，所述聚四氟乙烯粉料的粒径D90小于10μm。Further, the particle size D90 of the polytetrafluoroethylene powder is less than 10 μm.
由上述描述可知，采用的聚四氟乙烯粉料的粒径较小，有利于得到表面光滑的液晶聚合物薄膜。It can be seen from the above description that the particle size of the polytetrafluoroethylene powder used is small, which is beneficial to obtain a liquid crystal polymer film with a smooth surface.
进一步的，所述液晶聚合物溶液的粘度为3000~30000mPa•s。Further, the viscosity of the liquid crystal polymer solution is 3000-30000 mPa·s.
进一步的，所述液晶聚合物溶液的溶剂为1-甲基-2吡咯烷酮。Further, the solvent of the liquid crystal polymer solution is 1-methyl-2-pyrrolidone.
由上述描述可知，可通过调整溶剂含量以调整液晶聚合物溶液的粘度。As can be seen from the above description, the viscosity of the liquid crystal polymer solution can be adjusted by adjusting the solvent content.
进一步的，所述退火处理的温度为250~310℃，时间为2~8h。Further, the temperature of the annealing treatment is 250-310° C., and the time is 2-8 h.
由上述描述可知，退火处理可以去除液晶聚合物溶液中的溶剂。As can be seen from the above description, the annealing treatment can remove the solvent in the liquid crystal polymer solution.
进一步的，所述混合物中液晶聚合物溶液的重量份为90~110份，聚四氟乙烯粉料的重量份为10~100份。Further, the weight part of the liquid crystal polymer solution in the mixture is 90-110 parts, and the weight part of the polytetrafluoroethylene powder is 10-100 parts.
进一步的，将聚四氟乙烯原料通过液氮冷冻研磨仪进行液氮冷冻粉碎。Further, the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing pulverization by a liquid nitrogen freezing mill.
进一步的，涂覆时的涂膜厚度为5~30μm。Further, the coating film thickness during coating is 5-30 μm.
本发明涉及的另一技术方案为：Another technical scheme involved in the present invention is:
一种用于5G通信柔性覆铜板的液晶聚合物薄膜，根据所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法制备而成。A liquid crystal polymer film for a 5G communication flexible copper clad laminate is prepared according to the method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate.
实施例一Example 1
本发明的实施例一为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，包括如下步骤：Embodiment 1 of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, comprising the following steps:
1、将聚四氟乙烯原料进行液氮冷冻粉碎，得到聚四氟乙烯粉料。1. The polytetrafluoroethylene raw material is frozen and pulverized in liquid nitrogen to obtain polytetrafluoroethylene powder.
本实施例中，将聚四氟乙烯原料通过液氮冷冻研磨仪进行液氮冷冻粉碎，具体的，可将一定量的聚四氟乙烯原料加入至液氮冷冻研磨仪中，加入直径为2mm的氧化锆珠进行研磨。通过控制研磨的时间可以得到不同粒径的聚四氟乙烯粉料，例如，研磨1.5h可以得到D90为5μm的聚四氟乙烯粉料，研磨1h可以得到D90为9μm的聚四氟乙烯粉料，研磨20min可以得到D90为15μm的聚四氟乙烯粉料。优选的，采用的聚四氟乙烯粉料的粒径D90小于10μm。聚四氟乙烯粉料的粒径可通过激光粒度仪进行测试，本实施例的聚四氟乙烯原料的平均粒径D90为1000μm，可向Central Glass公司购买。In this embodiment, the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and crushing by a liquid nitrogen freezing grinder. Specifically, a certain amount of polytetrafluoroethylene raw material can be added to the liquid nitrogen freezing grinder, and a The zirconia beads were ground. By controlling the grinding time, PTFE powder with different particle sizes can be obtained. For example, grinding for 1.5h can obtain PTFE powder with D90 of 5μm, and grinding for 1h can obtain PTFE powder with D90 of 9μm , grinding for 20min can obtain PTFE powder with D90 of 15μm. Preferably, the particle size D90 of the polytetrafluoroethylene powder used is less than 10 μm. The particle size of the polytetrafluoroethylene powder can be tested by a laser particle size analyzer. The average particle size D90 of the polytetrafluoroethylene raw material in this example is 1000 μm, which can be purchased from Central Glass Company.
2、将液晶聚合物溶液与所述聚四氟乙烯粉料进行混合，得到混合物。2. Mix the liquid crystal polymer solution with the polytetrafluoroethylene powder to obtain a mixture.
所述液晶聚合物溶液的粘度为3000~30000mPa•s，所述液晶聚合物溶液的溶剂为1-甲基-2吡咯烷酮，液晶聚合物溶液为向住友化学株式会社购买的VR300型号。所述混合物中液晶聚合物溶液的重量份为90~110份，聚四氟乙烯粉料的重量份为10~100份。The viscosity of the liquid crystal polymer solution is 3000-30000 mPa·s, the solvent of the liquid crystal polymer solution is 1-methyl-2-pyrrolidone, and the liquid crystal polymer solution is model VR300 purchased from Sumitomo Chemical Co., Ltd. The weight part of the liquid crystal polymer solution in the mixture is 90-110 parts, and the weight part of the polytetrafluoroethylene powder is 10-100 parts.
3、将所述混合物涂覆于基材上，然后进行退火处理，得到所述液晶聚合物薄膜。3. Coating the mixture on a substrate, and then performing annealing treatment to obtain the liquid crystal polymer film.
本实施例中，涂覆时的涂膜厚度为5~30μm。所述退火处理的温度为250~310℃，时间为2~8h。In this embodiment, the thickness of the coating film during coating is 5 to 30 μm. The temperature of the annealing treatment is 250-310° C., and the time is 2-8 hours.
实施例二Embodiment 2
本发明的实施例二为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例一的而不同之处在于：The second embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
步骤2中，采用的液晶绝聚合物溶液的粘度为15000 mPa•s，液晶聚合物溶液的重量份为100份；采用的聚四氟乙烯粉料的粒径D90为5μm，用量为67份。In step 2, the viscosity of the liquid crystal insulating polymer solution used is 15000 mPa·s, and the weight part of the liquid crystal polymer solution is 100 parts; the particle size D90 of the polytetrafluoroethylene powder used is 5 μm, and the dosage is 67 parts.
步骤3中，涂膜厚度为15μm，退火处理的温度为280℃，时间为2h。In step 3, the thickness of the coating film is 15 μm, the temperature of the annealing treatment is 280° C., and the time is 2 h.
实施例三Embodiment 3
本发明的实施例三为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：The third embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为9μm，用量为11份。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 9 μm, and the dosage is 11 parts.
实施例四Embodiment 4
本发明的实施例四为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：The fourth embodiment of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为9μm。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 9 μm.
实施例五Embodiment 5
本发明的实施例五为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：The fifth embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second embodiment in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为9μm，用量为100份。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 9 μm, and the dosage is 100 parts.
实施例六Embodiment 6
本发明的实施例六为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例一的而不同之处在于：The sixth embodiment of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
步骤2中，采用的液晶绝聚合物溶液的粘度为3000 mPa•s，液晶聚合物溶液的重量份为90份；采用的聚四氟乙烯粉料的粒径D90为9μm，用量为10份。In step 2, the viscosity of the liquid crystal insulating polymer solution used is 3000 mPa·s, and the weight part of the liquid crystal polymer solution is 90 parts; the particle size D90 of the polytetrafluoroethylene powder used is 9 μm, and the dosage is 10 parts.
步骤3中，涂膜厚度为5μm，退火处理的温度为250℃，时间为8h。In step 3, the thickness of the coating film is 5 μm, the temperature of the annealing treatment is 250° C., and the time is 8 h.
实施例七Embodiment 7
本发明的实施例七为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例一的而不同之处在于：The seventh embodiment of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the first embodiment in that:
步骤2中，采用的液晶绝聚合物溶液的粘度为30000mPa•s，液晶聚合物溶液的重量份为110份；采用的聚四氟乙烯粉料的粒径D90为5μm，用量为20份。In step 2, the viscosity of the liquid crystal insulating polymer solution used is 30000 mPa·s, and the weight part of the liquid crystal polymer solution is 110 parts; the particle size D90 of the polytetrafluoroethylene powder used is 5 μm, and the dosage is 20 parts.
步骤3中，涂膜厚度为30μm，退火处理的温度为310℃，时间为2h。In step 3, the thickness of the coating film is 30 μm, the temperature of the annealing treatment is 310° C., and the time is 2 h.
对比实施例一Comparative Example 1
本发明的对比实施例一为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：Comparative Example 1 of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为9μm，用量为5份。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 9 μm, and the dosage is 5 parts.
对比实施例二Comparative Example 2
本发明的对比实施例二为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：The second comparative example of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from the second example in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为9μm，用量为120份。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 9 μm, and the dosage is 120 parts.
对比实施例三Comparative Example Three
本发明的对比实施例三为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：Comparative Example 3 of the present invention is a preparation method of a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
步骤2中，采用的聚四氟乙烯粉料的粒径D90为15μm。In step 2, the particle size D90 of the polytetrafluoroethylene powder used is 15 μm.
对比实施例四Comparative Example Four
本发明的对比实施例四为一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，与实施例二的而不同之处在于：Comparative Example 4 of the present invention is a method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, which is different from Example 2 in that:
步骤2中，采用未经液氮冷冻粉碎聚的四氟乙烯原料。In step 2, the polytetrafluoroethylene raw material that has not been frozen and pulverized by liquid nitrogen is used.
对实施例二至对比实施例四制备得到的液晶聚合物薄膜分别进行介电性能、力学性能测试和粗糙度测试，其测试结果如表1所示。The dielectric properties, mechanical properties and roughness tests of the liquid crystal polymer films prepared in Examples 2 to 4 were respectively carried out, and the test results are shown in Table 1.
测试液晶聚合物薄膜的介电性能时，将液晶聚合物薄膜裁成80mm×80mm正方形，测定介电常数和介电损耗。测试方法是谐振腔法。作为测试设备，使用Keysight公司制的E5071型网络分析仪，分离介质谐振器(SPDR)夹具。介电常数和介电损耗的测试是频率在高频10GHz的数据。其中介电常数在3.0以下为良好，介电常数在3.0以上为差。When testing the dielectric properties of the liquid crystal polymer film, the liquid crystal polymer film was cut into a square of 80 mm×80 mm, and the dielectric constant and dielectric loss were measured. The test method is the resonant cavity method. As the test equipment, a network analyzer model E5071, a split dielectric resonator (SPDR) jig, manufactured by Keysight Corporation was used. The test of dielectric constant and dielectric loss is the data at high frequency 10GHz. Among them, a dielectric constant of 3.0 or less is good, and a dielectric constant of 3.0 or more is poor.
进行力学性能测试时，按照ISO-527-3标准，将液晶聚酯薄膜用裁刀裁成Type-5哑铃型，测定拉伸强度和断裂伸长率。作为测试设备，使用新三思公司制的C45.102型电子万能试验机。使用拉伸试验机以10mm/min的速度进行拉伸，求出试样断裂时的强度以及断裂伸长率。During the mechanical property test, according to the ISO-527-3 standard, the liquid crystal polyester film was cut into a Type-5 dumbbell shape with a cutter, and the tensile strength and elongation at break were measured. As the test equipment, a C45.102 electronic universal testing machine manufactured by Shinsansi Co., Ltd. was used. The tensile strength and elongation at break of the sample at break were obtained by pulling the sample at a speed of 10 mm/min using a tensile tester.
进行粗糙度测试时，将液晶聚合物薄膜用裁刀裁成5mm×5mm正方形样条，测试样品的表面线性粗糙度。作为测试设备，使用Mitutoyo公司制的SJ-410型表面粗糙度仪。测试的点数是10个，通过计算一条线上10个点的平均线性表面粗糙度Rz。其中Rz在4以下为优良，Rz在4~5之间为良好，Rz在5之上为不良。此外，如果表面有明显团聚物也为不良。During the roughness test, the liquid crystal polymer film was cut into a 5mm×5mm square spline with a cutter to test the surface linear roughness of the sample. As a test apparatus, a surface roughness meter SJ-410 manufactured by Mitutoyo Corporation was used. The number of test points is 10, by calculating the average linear surface roughness Rz of 10 points on a line. Among them, Rz of 4 or less is good, Rz of 4 to 5 is good, and Rz of 5 or more is bad. In addition, it is not good if there are obvious agglomerates on the surface.
表1 性能测试结果Table 1 Performance test results
样品 sample 介电常数 Dielectric constant 介电损耗 Dielectric loss 拉伸强度（MPa） Tensile strength (MPa) 断裂伸长率（%） Elongation at break (%) 表面粗糙度（Rz） Surface roughness (Rz) 外观 Exterior
实施例二 Embodiment 2 2.6 2.6 0.0032 0.0032 70 70 15 15 3.9 3.9 优良 excellent
实施例三 Embodiment 3 2.9 2.9 0.0039 0.0039 110 110 20 20 2.0 2.0 优良 excellent
实施例四 Embodiment 4 2.6 2.6 0.0033 0.0033 65 65 11 11 3.9 3.9 优良 excellent
实施例五 Embodiment 5 2.4 2.4 0.0030 0.0030 50 50 10 10 4.5 4.5 良好 good
实施例六 Embodiment 6 2.9 2.9 0.0039 0.0039 107 107 19 19 2.3 2.3 优良 excellent
实施例七 Embodiment 7 2.8 2.8 0.0037 0.0037 96 96 17 17 2.7 2.7 优良 excellent
对比实施例一 Comparative Example 1 3.5 3.5 0.0045 0.0045 120 120 23 twenty three 1.6 1.6 优良 excellent
对比实施例二 Comparative Example 2 2.4 2.4 0.0028 0.0028 35 35 6 6 有明显团聚物 There are obvious agglomerates 不良 bad
对比实施例三 Comparative Example Three 2.9 2.9 0.0035 0.0035 39 39 8 8 有明显团聚物 There are obvious agglomerates 不良 bad
对比实施例四 Comparative Example Four 6.3 6.3 0.0150 0.0150 5 5 1 1 有明显颗粒状 obvious granular 不良 bad
从表1可知，通过实施例三和实施例四的测试结果可知，在一定范围内，随着聚四氟乙烯含量的增高，液晶聚合物薄膜的介电性能越好。通过对比实施例一的测试结果可知，当聚四氟乙烯含量过少时，达不到改善介电性能的目的；通过对比实施例二的测试结果可知，当聚四氟乙烯的含量过高时，会产生团聚现象，外观达不到要求。From Table 1, it can be seen from the test results of Example 3 and Example 4 that within a certain range, as the content of PTFE increases, the dielectric properties of the liquid crystal polymer film are better. It can be seen from the test results of Comparative Example 1 that when the content of PTFE is too low, the purpose of improving the dielectric properties cannot be achieved; from the test results of Comparative Example 2, it can be seen that when the content of PTFE is too high, There will be agglomeration, and the appearance will not meet the requirements.
通过对比实施例二和实施例四的测试数据可知，当聚四氟乙烯粉料的粒径D90在10μm以下时，粒径的大小对液晶聚合物薄膜的介电性能和外观影响不大。通过对比实施例三的测试数据可知，当采用的聚四氟乙烯粉料的粒径较大时，会产生团聚现象，外观达不到要求。By comparing the test data of Example 2 and Example 4, it can be seen that when the particle size D90 of the polytetrafluoroethylene powder is below 10 μm, the particle size has little effect on the dielectric properties and appearance of the liquid crystal polymer film. By comparing the test data of Example 3, it can be seen that when the particle size of the PTFE powder used is larger, agglomeration will occur, and the appearance cannot meet the requirements.
综上所述，本发明提供的一种用于5G通信柔性覆铜板的液晶聚合物薄膜及其制备方法，可以制备得到较低介电常数、较低介电损耗且表面光滑、具有一定力学强度的液晶聚合物薄膜；制备得到的液晶聚合物薄膜适用于高频高速柔性覆铜板。In summary, a liquid crystal polymer film for a 5G communication flexible copper clad laminate and a preparation method thereof provided by the present invention can be prepared to obtain a lower dielectric constant, a lower dielectric loss, a smooth surface, and a certain mechanical strength The liquid crystal polymer film prepared; the prepared liquid crystal polymer film is suitable for high frequency and high speed flexible copper clad laminates.
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书内容所作的等同变换，或直接或间接运用在相关的技术领域，均同理包括在本发明的专利保护范围内。The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent transformation made by using the contents of the description of the present invention, or directly or indirectly applied in related technical fields, are similarly included in the scope of the present invention. within the scope of patent protection.

Claims (9)

  1. 一种用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，将聚四氟乙烯原料进行液氮冷冻粉碎，得到聚四氟乙烯粉料；将液晶聚合物溶液与所述聚四氟乙烯粉料进行混合，得到混合物；将所述混合物涂覆于基材上，然后进行退火处理，得到所述液晶聚合物薄膜。A method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate, characterized in that the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and pulverization to obtain polytetrafluoroethylene powder; the liquid crystal polymer solution is mixed with the The polytetrafluoroethylene powder is mixed to obtain a mixture; the mixture is coated on a substrate, and then annealed to obtain the liquid crystal polymer film.
  2. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，所述聚四氟乙烯粉料的粒径D90小于10μm。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the particle size D90 of the polytetrafluoroethylene powder is less than 10 μm.
  3. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，所述液晶聚合物溶液的粘度为3000~30000mPa•s。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the viscosity of the liquid crystal polymer solution is 3000-30000 mPa·s.
  4. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，所述液晶聚合物溶液的溶剂为1-甲基-2吡咯烷酮。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the solvent of the liquid crystal polymer solution is 1-methyl-2-pyrrolidone.
  5. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，所述退火处理的温度为250~310℃，时间为2~8h。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the temperature of the annealing treatment is 250-310°C, and the time is 2-8h.
  6. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，所述混合物中液晶聚合物溶液的重量份为90~110份，聚四氟乙烯粉料的重量份为10~100份。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the liquid crystal polymer solution in the mixture is 90-110 parts by weight, and the polytetrafluoroethylene powder is 90-110 parts by weight. The weight part is 10~100 parts.
  7. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，将聚四氟乙烯原料通过液氮冷冻研磨仪进行液氮冷冻粉碎。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the polytetrafluoroethylene raw material is subjected to liquid nitrogen freezing and crushing by a liquid nitrogen freezing grinder.
  8. 根据权利要求1所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法，其特征在于，涂覆时的涂膜厚度为5~30μm。The method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to claim 1, wherein the thickness of the coating film during coating is 5-30 μm.
  9. 一种用于5G通信柔性覆铜板的液晶聚合物薄膜，其特征在于，根据权利要求1-8任意一项所述的用于5G通信柔性覆铜板的液晶聚合物薄膜的制备方法制备而成。A liquid crystal polymer film for a 5G communication flexible copper clad laminate, characterized in that it is prepared according to the method for preparing a liquid crystal polymer film for a 5G communication flexible copper clad laminate according to any one of claims 1-8.
PCT/CN2021/113449 2020-08-24 2021-08-19 Liquid crystal polymer film for 5g communication flexible copper clad laminate and preparation method therefor WO2022042412A1 (en)

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