WO2016176895A1 - 石墨烯基树脂球及其导电框胶的制备方法 - Google Patents

石墨烯基树脂球及其导电框胶的制备方法 Download PDF

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WO2016176895A1
WO2016176895A1 PCT/CN2015/081724 CN2015081724W WO2016176895A1 WO 2016176895 A1 WO2016176895 A1 WO 2016176895A1 CN 2015081724 W CN2015081724 W CN 2015081724W WO 2016176895 A1 WO2016176895 A1 WO 2016176895A1
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graphene
resin ball
solution
resin
graphene oxide
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PCT/CN2015/081724
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French (fr)
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胡韬
陈雅惠
李泳锐
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深圳市华星光电技术有限公司
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Priority to US14/777,519 priority Critical patent/US20170107333A1/en
Publication of WO2016176895A1 publication Critical patent/WO2016176895A1/zh

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    • C09J157/00—Adhesives based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
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    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
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    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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    • C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2425/02—Homopolymers or copolymers of hydrocarbons
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    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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Definitions

  • the invention relates to the field of flat panel displays, in particular to a method for preparing a graphene resin ball and a method for preparing a conductive frame glue.
  • a frame glue containing conductive gold balls is commonly used to turn on the upper and lower substrates.
  • the gold/nickel coating layer on the outer layer of the conductive gold ball can transmit electrons (the conductivity requirement is 2.4 ⁇ 10 5 S/cm), and the elastic gold ball core has an elastic resin ball to buffer the pressure after bonding.
  • the traditional conductive gold ball is produced by chemical plating on the surface of the resin ball with a diameter of 5-8 ⁇ m. The method consumes a large amount of energy, and is prone to heavy metal pollution in the process, and the price of gold is expensive and the cost is increased. .
  • Graphene is completely acceptable due to its excellent electron transport ability (conductivity of about 10 6 S/cm), excellent mechanical properties and good flexibility (Young's modulus of about 1060 GPa, breaking strength of 130 GPa), stable chemical properties.
  • the gold/nickel layer is wrapped on the surface of the resin ball to form a graphene-based conductive ball having excellent electrical conductivity. It not only can turn on the upper and lower substrates, but also has excellent thermal conductivity (thermal conductivity up to 5300W/m/K).
  • the graphene nanosheet can also improve the heat curing efficiency of the sealant and make the sealant more uniform. Therefore, how to engrave the resin ball well in the graphene becomes the key to making the graphene-based conductive ball.
  • the graphene sheets Due to the van der Waals interaction between the pure graphene nanosheets, the graphene sheets are easily complexed and precipitated in an aqueous solution, and it is difficult to disperse into a graphene solution having a relatively high solid content. When mixed with a well dispersed resin ball solution, the resin ball cannot be effectively wrapped.
  • Surface treatment such as acidification or surfactant dispersion of graphene sheets is generally used to improve the dispersibility of the graphene solution, but on the one hand, the solid content of the graphene dispersion obtained is still low, which increases the cost; Acidification can destroy the electron conduction on the surface of graphene nanosheets, and the introduction of non-conductive surfactants can seriously reduce the electron conductivity of graphene composites.
  • Graphene oxide is generally obtained by ultrasonic treatment after peeling off the graphite sheet by chemical oxidation. Due to the action of strong oxidants, a large number of oxygen-containing groups, such as epoxy groups, hydroxyl groups, carboxyl groups, etc., are formed on the surface and around the graphene oxide nanosheets. Based on the intermolecular repulsion, water molecules easily penetrate into the layers of graphene oxide.
  • the nanosheets have high hydrophilic properties, and a single layer or a small layer of graphene oxide solution with a layer peeling can be easily obtained by simple ultrasonication, and the solid content is controllable.
  • graphene oxide nanosheets can form stable composite structures with many compounds such as oxides and organic resin materials.
  • An effective precursor for the preparation of graphene-based composites in the liquid phase for resin spheres of suitable size (particle size range of 1 to 10 ⁇ m, resin spheres may be polymer microspheres such as polystyrene and polyacrylic resin), graphene oxide nanosheets may be coated on the surface of the resin sphere to form a stable Core-shell structure.
  • graphene oxide is usually reduced by a chemical reducing agent (hydrogen sulfide, hydrazine, hydroquinone, sodium hydroxide, potassium hydroxide, aluminum powder), but this process takes a long time.
  • a chemical reducing agent hydrogen sulfide, hydrazine, hydroquinone, sodium hydroxide, potassium hydroxide, aluminum powder
  • the chemical reagents used such as hydration traps, are highly toxic and not suitable for large-scale production.
  • Thermal shock means (900-1100 ° C) can also be used to remove oxygenates, but this method has high energy consumption and can destroy composite materials at high temperatures. Other parts of the resin, such as resin balls, will decompose and crack at high temperatures.
  • the object of the present invention is to provide a method for preparing a graphene-based resin ball, which uses a green flash lamp exposure method to reduce graphene oxide, and the process is simple and easy to control, and can be used for mass production.
  • the object of the present invention is to provide a method for preparing a conductive sealant, which uses a graphene-based resin ball as a conductive particle to replace the conductive gold ball commonly used in the current conductive sealant.
  • the preparation process of the graphene resin ball is green and environmentally friendly. The heavy metal pollution generated in the production process of the conductive gold ball can be avoided; and the graphene oxide used in the preparation of the graphene resin ball is an effective precursor for the large-scale preparation of the graphene material, has a wide range of sources, and can effectively reduce the cost. .
  • the present invention provides a method for preparing a graphene-based resin ball, which comprises the following steps:
  • Step 1 Prepare a 0.1-5 mg/ml graphene oxide solution and a 1-10 mg/ml resin ball solution, and the 0.1-5 mg/ml graphene oxide solution and the 1-10 mg/ml resin ball solution. After mixing and magnetic stirring for 5 min to 1 h, a mixed solution is obtained, and the mixed solution is ultrasonically treated for 5 min to 2 h to obtain a graphene oxide resin ball solution;
  • Step 2 filtering the graphene oxide resin ball solution, drying the filter residue obtained by filtration in the air at 60 ° C ⁇ 100 ° C for 0.5 h ⁇ 4 h, completely removing water, to obtain a yellow-brown oxide graphene resin pellet powder ;
  • Step 3 The oxidized graphene-based resin ball powder is subjected to exposure reduction using a flash lamp, and graphene oxide coated on the surface of the resin ball is reduced to graphene to obtain a graphene-based resin ball.
  • the resin ball solution is prepared by dispersing a resin ball in an aqueous solution by ultrasonic treatment.
  • the material of the resin ball is polystyrene or polyacrylic resin
  • the particle diameter of the resin sphere is in the range of 1 to 10 ⁇ m.
  • the graphene oxide resin ball solution is filtered using a suction filtration device.
  • the magnetic stirring time is 10 min, and the ultrasonic treatment time is 30 min; in the step 2, the filter residue obtained after the filtration is dried in the air at 80 ° C for 2 h.
  • the exposure energy of the flash lamp ranges from 0.5 to 3 J/cm 2 .
  • step 3 during the exposure process, when the color of the oxy graphene oxide resin ball powder is blackened, accompanied by a click, the exposure is temporarily stopped and the powder is agitated, and the exposure is continued, and the exposure and the agitation are repeated multiple times.
  • the graphene oxide resin ball powder is reduced until it is free from clicks.
  • the invention also provides a method for preparing a graphene resin ball, comprising the following steps:
  • Step 1 Prepare a 0.1-5 mg/ml graphene oxide solution and a 1-10 mg/ml resin ball solution, and the 0.1-5 mg/ml graphene oxide solution and the 1-10 mg/ml resin ball solution. After mixing and magnetic stirring for 5 min to 1 h, a mixed solution is obtained, and the mixed solution is ultrasonically treated for 5 min to 2 h to obtain a graphene oxide resin ball solution;
  • Step 2 filtering the graphene oxide resin ball solution, drying the filter residue obtained by filtration in the air at 60 ° C ⁇ 100 ° C for 0.5 h ⁇ 4 h, completely removing water, to obtain a yellow-brown oxide graphene resin pellet powder ;
  • Step 3 using a flash lamp to expose and reduce the graphene oxide resin ball powder, and reducing the graphene oxide coated on the surface of the resin ball to graphene to obtain a graphene resin ball;
  • the resin ball solution is prepared by dispersing a resin ball in an aqueous solution by ultrasonic treatment
  • the resin ball material is polystyrene or polyacrylic resin
  • the resin ball has a particle size ranging from 1 to 10 ⁇ m
  • the graphene oxide resin ball solution is filtered using a suction filter device.
  • the invention also provides a preparation method of a conductive sealant, which comprises the following steps:
  • Step 10 preparing a graphene-based resin ball by using the above method for preparing a graphene resin ball
  • Step 20 mixing the graphene resin ball with the sealant, stirring and defoaming, and completing the rubberizing process to obtain a conductive sealant.
  • the graphene resin ball and the sealant are mixed at a mass ratio of 1:40.
  • the mixture is put into a rubberizing cylinder, and the rubberizing cylinder is placed in a rotating machine capable of rotating and revolving, and stirred. Defoaming process.
  • the invention adopts green environmental protection flash exposure method to reduce graphene oxide, the process is simple and easy to control, and can be used for large-scale production, and the graphene-based resin sphere is widely used as a conductive particle in the conductive frame glue to construct an effective technical guarantee. ;
  • the graphene-based resin sphere prepared by the present invention can be applied to an anisotropic conductive paste (ACP) and anisotropic conductive which are widely used in the semiconductor industry, in addition to a conductive sealant for liquid crystal panel packaging.
  • ACP anisotropic conductive paste
  • anisotropic conductive which are widely used in the semiconductor industry, in addition to a conductive sealant for liquid crystal panel packaging.
  • conductive materials such as film (ACF)
  • Graphene oxide used in the preparation of graphene-based resin spheres is an effective precursor for large-scale preparation of graphene materials, and has a wide range of sources, and can effectively reduce costs.
  • FIG. 1 is a flow chart of a method for preparing a graphene-based resin ball of the present invention.
  • the present invention firstly provides a method for preparing a graphene resin ball, comprising the following steps:
  • Step 1 Prepare a 0.1-5 mg/ml graphene oxide solution and a 1-10 mg/ml resin ball solution, and the 0.1-5 mg/ml graphene oxide solution and the 1-10 mg/ml resin ball solution. After mixing and magnetic stirring for 5 min to 1 h, a mixed solution is obtained, and the mixed solution is ultrasonically treated for 5 min to 2 h to obtain a graphene oxide resin ball solution.
  • the graphene oxide resin sphere solution has good dispersibility, and at this time, the flexible graphene oxide sheet can tightly enclose the resin sphere due to the action of the oxygen-containing group on the surface of the graphene oxide.
  • the resin ball solution is prepared by dispersing a resin ball in an aqueous solution by ultrasonic treatment
  • the material of the resin ball is polystyrene or polyacrylic resin
  • the resin ball has a particle diameter ranging from 1 to 10 ⁇ m.
  • the resin ball has a particle diameter ranging from 5 to 8 ⁇ m.
  • the magnetic stirring time is 10 min, and the ultrasonic treatment time is 30 min.
  • Step 2 filtering the graphene oxide resin sphere solution by using a suction filter device, and drying the filter residue obtained by filtration in the air at 60 ° C to 100 ° C for 0.5 h to 4 h to completely remove water to obtain yellow-brown graphene oxide.
  • Base resin ball powder
  • the filter residue obtained after filtration is dried in air at 80 ° C for 2 h.
  • Step 3 The oxidized graphene-based resin ball powder is subjected to exposure reduction using a flash lamp, and graphene oxide coated on the surface of the resin ball is reduced to graphene to obtain a graphene-based resin ball.
  • the flash is an ordinary flash, and the exposure energy of the flash is in the range of 0.5-3J/cm 2 ;
  • the color of the graphene oxide resin ball powder is blackened and accompanied by squeaking.
  • the exposure can be temporarily stopped and the powder is agitated, and the exposure is continued, and the exposure is repeated.
  • the agglomerated graphene oxide resin ball powder was completely agitated until it was free from squeaking, and a graphene-based resin ball was obtained.
  • the invention provides a method for preparing a graphene resin ball, which uses a green flash lamp exposure method to reduce graphene oxide, and the process is simple and easy to control, and can be used for mass production.
  • the graphene resin ball prepared by the invention can be applied to the conductive frame glue for liquid crystal panel packaging, and can also be applied to anisotropic conductive paste (ACP) and anisotropic conductive film (ACF) which are widely used in the semiconductor industry. ), etc., and therefore have great commercial development value and great market application prospects.
  • ACP anisotropic conductive paste
  • ACF anisotropic conductive film
  • the invention also provides a preparation method of a conductive sealant, which comprises the following steps:
  • Step 10 preparing a graphene resin ball by using the above method for preparing a graphene resin ball
  • Step 20 mixing the graphene resin ball with the sealant, stirring and defoaming, and completing the rubberizing process to obtain a conductive sealant.
  • the graphene resin ball and the sealant are mixed at a mass ratio of 1:40, and then the mixture is placed in a rubber tube, and then the rubber tube is placed in a self-rotating and public manner.
  • the stirring and defoaming processes are carried out in a rotating rotary machine.
  • the invention provides a method for preparing a conductive sealant, which uses a graphene-based resin ball as a conductive particle to replace the conductive gold ball commonly used in the current conductive sealant, thereby avoiding the problem of heavy metal pollution generated in the production process of the conductive gold ball;
  • the method for preparing graphene-based resin spheres in the method is green, simple and easy to control; the graphene oxide used in the preparation of graphene-based resin spheres is an effective precursor for large-scale preparation of graphene materials, has a wide range of sources, and can effectively reduce costs.
  • the present invention further provides a method for packaging a liquid crystal display panel by using a conductive sealant prepared by the above method, and the specific operation is as follows:
  • the liquid crystal display panel is obtained by using a conductive frame glue containing a graphene-based resin ball.
  • the color film substrate and the array substrate are electrically connected by a conductive frame;
  • the curing efficiency of the conductive sealant can be improved, and the curing is more uniform; in addition, due to the excellent mechanics of graphene
  • the performance can effectively alleviate the pressure when the upper and lower substrates are bonded together, can support the upper and lower substrates well, maintain the stability of the substrate gap, ensure the consistency of the liquid crystal cell thickness, and reduce the generation of the edge Mura.
  • the present invention provides a method for preparing a graphene resin ball, which uses a green flash lamp exposure method to reduce graphene oxide.
  • the process is simple and easy to control, and can be used for mass production.
  • the invention provides a method for preparing a conductive sealant, which uses a graphene-based resin ball as a conductive particle to replace the conductive gold ball commonly used in the current conductive sealant.
  • the preparation process of the graphene resin ball is green and environmentally friendly, and can avoid electrical conduction. Heavy metal pollution generated during the production of gold balls; and the graphene oxide used in the preparation of the graphene resin balls is an effective precursor for the large-scale preparation of graphene materials, has a wide range of sources, and can effectively reduce costs.

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Abstract

提供一种石墨烯基树脂球的制备方法，包括：将氧化石墨溶液与树脂球溶液混合得到氧化石墨烯树脂球溶液，而后过滤干燥得到氧化石墨烯树脂球粉末，再采用闪光灯进行曝光还原可得石墨烯基树脂球。另提供一种导电框胶的制备方法，将石墨烯基树脂球与框胶进行混胶、搅拌和脱泡工艺即可。该方法使用绿色环保的闪光灯曝光法还原氧化石墨烯，工艺简单易控，能有效降低成本，可用于大规模生产。

Description

石墨烯基树脂球的制备方法与导电框胶的制备方法 技术领域
本发明涉及平面显示器领域，尤其涉及一种石墨烯基树脂球的制备方法与导电框胶的制备方法。
背景技术
目前，在液晶显示(Liquid Crystal Display，LCD)产业中常用掺有导电金球(Au ball)的框胶来导通上下基板。当基板贴合后，导电金球外层的金/镍包裹层能够传输电子(电导率要求达到2.4×105S/cm)，导电金球内核具有弹性的树脂球能够缓冲贴合后的压力。传统导电金球的生产是使用化学镀法在直径为5～8μm的树脂球表面进行金/镍的包裹，此法耗能大，过程中易产生重金属污染，而且金的价格昂贵，增加了成本。
石墨烯由于其优异的电子传输能力(电导率约为106S/cm)，优良的机械性能和良好的柔性(杨氏模量约1060GPa，断裂强度130GPa)，稳定的化学性质，完全可以取代金/镍层包裹在树脂球表面，形成具有优异导电性能的石墨烯基导电球。它不仅能够导通上下基板，而且导热性能优异(导热系数高达5300W/m/K)的石墨烯纳米片还能提高框胶的加热固化效率，使框胶固化更加均匀。因此如何将石墨烯良好的包裹住树脂球成为了制作石墨烯基导电球的关键。由于纯的石墨烯纳米片之间的范德华作用，在水溶液中石墨烯片易络合沉淀，很难分散成固含量较高的石墨烯溶液。当与分散较好的树脂球溶液混合时，无法有效地包裹住树脂球。一般采用对石墨烯片进行表面处理如酸化或者表面活性剂分散来改善石墨烯溶液的分散性，但是，一方面所得石墨烯分散液固含量仍然较低，增加了成本；另一方面这些处理如酸化会破坏石墨烯纳米片表面的电子传导，不导电表面活性剂的引入等会严重降低石墨烯复合材料的电子传导能力。
氧化石墨烯一般采用化学氧化法剥离石墨片后超声处理获得。由于强氧化剂的作用，在氧化石墨烯纳米片表面和四周生成大量的含氧基团，如环氧基，羟基，羧基等，基于分子间斥力作用，水分子很容易渗透到氧化石墨烯各层纳米片，使其具有高亲水特性，通过简单的超声就很容易得到层层剥离的单层或少层氧化石墨烯溶液，而且固含量可控。得益于这些含氧基团的电子吸附和氧化石墨烯纳米片的范德华力，氧化石墨烯纳米片可以与诸多化合物如氧化物、有机树脂材料等形成稳定的复合结构，从而成 为液相制备石墨烯基复合材料的有效前驱物。对于尺寸合适的树脂球类(粒径范围为1～10μm，树脂球可为聚苯乙烯、聚丙烯酸树脂等聚合物微球)，氧化石墨烯纳米片都可以包覆在树脂球表面，形成稳定的核壳结构。但是，这些氧化石墨烯的含氧功能基团会导致氧化石墨烯导电性差，从而严重影响了氧化石墨烯复合物在导电材方面的应用。因此如何采用有效地、可工业应用的方法，将氧化石墨烯还原成石墨烯是目前研究的热点。
为提高氧化石墨烯的导电性，目前通常采用化学还原剂(氢化硫、肼、对苯二酚、氢氧化钠、氢氧化钾、铝粉)还原氧化石墨烯，但是此工艺耗费时间较长，所用化学试剂如水合阱等有剧毒，不适合大规模生产；另外还可以使用热冲击手段(900-1100℃)来去除含氧基，但此法能耗较高，高温时能够破坏复合材料中的其它部分，如树脂球会在高温下分解裂解等。
发明内容
本发明的目的在于提供一种石墨烯基树脂球的制备方法，使用绿色环保的闪光灯曝光法还原氧化石墨烯，工艺简单易控，可用于大规模生产。
本发明的目的还在于提供一种导电框胶的制备方法，采用石墨烯基树脂球作为导电粒子代替目前导电框胶中常用的导电金球，所述石墨烯基树脂球的制备工艺绿色环保，能够避免导电金球生产过程中产生的重金属污染；并且所述石墨烯基树脂球的制备过程中使用的氧化石墨烯是大规模制备石墨烯材料的有效前驱体，来源广泛，能够有效地降低成本。
为实现上述目的，本发明提供一种石墨烯基树脂球的制备方法，其包括以下步骤：
步骤1、配制0.1-5mg/ml的氧化石墨烯溶液与1-10mg/ml的树脂球溶液，将所述0.1-5mg/ml的氧化石墨烯溶液与所述1-10mg/ml的树脂球溶液混合，磁力搅拌5min～1h后，得到一混合溶液，超声处理该混合溶液5min～2h，得到氧化石墨烯树脂球溶液；
步骤2、过滤所述氧化石墨烯树脂球溶液，将过滤后得到的滤渣在空气中60℃～100℃下烘干0.5h～4h，完全去除水分，得到黄褐色的氧化石墨烯基树脂球粉末；
步骤3、采用闪光灯对所述氧化石墨烯基树脂球粉末进行曝光还原，将树脂球表面包裹的氧化石墨烯还原成石墨烯，得到石墨烯基树脂球。
所述步骤1中，所述树脂球溶液由树脂球通过超声处理分散在水溶液中制得。
所述步骤1中，所述树脂球的材料为聚苯乙烯或聚丙烯酸树脂，所述 树脂球的粒径范围为1～10μm。
所述步骤2中，使用抽滤装置对氧化石墨烯树脂球溶液进行过滤。
所述步骤1中，磁力搅拌的时间为10min，超声处理的时间为30min；所述步骤2中，将过滤后得到的滤渣在空气中80℃下烘干2h。
所述步骤3中，所述闪光灯的曝光能量范围为0.5-3J/cm2。
所述步骤3中，在曝光过程中，当所述氧化石墨烯基树脂球粉末颜色变黑，并伴有噼啪声时，暂时停止曝光并搅动该粉末，再继续曝光，重复曝光与搅动多次，直到无噼啪声为止，所述氧化石墨烯基树脂球粉末即被还原完毕。
本发明还提供一种石墨烯基树脂球的制备方法，包括以下步骤：
步骤1、配制0.1-5mg/ml的氧化石墨烯溶液与1-10mg/ml的树脂球溶液，将所述0.1-5mg/ml的氧化石墨烯溶液与所述1-10mg/ml的树脂球溶液混合，磁力搅拌5min～1h后，得到一混合溶液，超声处理该混合溶液5min～2h，得到氧化石墨烯树脂球溶液；
步骤2、过滤所述氧化石墨烯树脂球溶液，将过滤后得到的滤渣在空气中60℃～100℃下烘干0.5h～4h，完全去除水分，得到黄褐色的氧化石墨烯基树脂球粉末；
步骤3、采用闪光灯对所述氧化石墨烯基树脂球粉末进行曝光还原，将树脂球表面包裹的氧化石墨烯还原成石墨烯，得到石墨烯基树脂球；
其中，所述步骤1中，所述树脂球溶液由树脂球通过超声处理分散在水溶液中制得；
其中，所述步骤1中，所述树脂球的材料为聚苯乙烯或聚丙烯酸树脂，所述树脂球的粒径范围为1～10μm；
其中，所述步骤2中，使用抽滤装置对氧化石墨烯树脂球溶液进行过滤。
本发明还提供一种导电框胶的的制备方法，其包括以下步骤：
步骤10、采用上述的石墨烯基树脂球的制备方法制备出石墨烯基树脂球；
步骤20、将石墨烯基树脂球与框胶进行混胶、搅拌和脱泡工序，完成调胶过程，得到一种导电框胶。
所述步骤20中，所述石墨烯基树脂球与所述框胶按1:40的质量比混合。
所述步骤20中，所述石墨烯基树脂球与所述框胶进行混合后，将混合物放入调胶筒内，再将调胶筒放入可以自转和公转的旋转机中进行搅拌和 脱泡工序。
本发明提供的一种石墨烯基树脂球的制备方法，相较于现有技术具有以下优点：
(1)本发明使用绿色环保的闪光灯曝光法还原氧化石墨烯，工艺简单易控，可用于大规模生产，为石墨烯基树脂球作为导电粒子在导电框胶中广泛应用构筑了有效的技术保障；
(2)本发明制备的石墨烯基树脂球除可应用于液晶面板封装用的导电框胶以外，还可以应用于半导体行业中被广泛应用的各向异性导电胶(ACP)和各向异性导电膜(ACF)等导电材中，因此具有极大的商业开发价值和巨大的市场应用前景。
本发明提供的一种导电框胶的制备方法，相较于现有技术具有以下优点：
(Ⅰ)采用石墨烯基树脂球作为导电粒子，代替目前导电框胶中常用的导电金球，能够避免导电金球生产过程中产生的重金属污染问题；
(Ⅱ)制备石墨烯基树脂球的工艺绿色环保，简单易控；
(Ⅲ)制备石墨烯基树脂球时使用的氧化石墨烯是大规模制备石墨烯材料的有效前驱体，来源广泛，能够有效地降低成本。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为本发明的石墨烯基树脂球的制备方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明首先提供一种石墨烯基树脂球的制备方法，包括以下步骤：
步骤1、配制0.1-5mg/ml的氧化石墨烯溶液与1-10mg/ml的树脂球溶液，将所述0.1-5mg/ml的氧化石墨烯溶液与所述1-10mg/ml的树脂球溶液 混合，磁力搅拌5min～1h后，得到一混合溶液，超声处理该混合溶液5min～2h，得到氧化石墨烯树脂球溶液。
可以观察到该氧化石墨烯树脂球溶液具有很好的分散性，此时，由于氧化石墨烯表面含氧基团的作用，柔性的氧化石墨烯片能够将树脂球紧密的包裹住。
其中，所述树脂球溶液由树脂球通过超声处理分散在水溶液中制得；
具体的，所述树脂球的材料为聚苯乙烯或聚丙烯酸树脂，所述树脂球的粒径范围为1～10μm，优选的，所述树脂球的粒径范围为5～8μm。
优选的，所述步骤1中，磁力搅拌的时间为10min，超声处理的时间为30min。
步骤2、使用抽滤装置过滤所述氧化石墨烯树脂球溶液，将过滤后得到的滤渣在空气中60℃～100℃下烘干0.5h～4h，完全去除水分，得到黄褐色的氧化石墨烯基树脂球粉末。
优选的，所述步骤2中，将过滤后得到的滤渣在空气中80℃下烘干2h。
步骤3、采用闪光灯对所述氧化石墨烯基树脂球粉末进行曝光还原，将树脂球表面包裹的氧化石墨烯还原成石墨烯，得到石墨烯基树脂球。
其中，该闪光灯为普通闪光灯即可，所述闪光灯的曝光能量范围为0.5-3J/cm2；
在曝光过程中，会观察到所述氧化石墨烯基树脂球粉末颜色变黑，并伴有噼啪声，为了使反应更彻底，可以暂时停止曝光并将粉末搅动下，再继续曝光，重复曝光与搅动几次，直到无噼啪声为止，所述氧化石墨烯基树脂球粉末即被还原完毕，获得石墨烯基树脂球。
本发明提供的一种石墨烯基树脂球的制备方法，使用绿色环保的闪光灯曝光法还原氧化石墨烯，工艺简单易控，可用于大规模生产。
本发明制备的石墨烯基树脂球除可应用于液晶面板封装用的导电框胶以外，还可以应用于半导体行业中被广泛应用的各向异性导电胶(ACP)和各向异性导电膜(ACF)等导电材中，因此具有极大的商业开发价值和巨大的市场应用前景。
本发明还提供一种导电框胶的的制备方法，其包括以下步骤：
步骤10、采用上述石墨烯基树脂球的制备方法制备出石墨烯基树脂球；
步骤20、将石墨烯基树脂球与框胶进行混胶、搅拌和脱泡工序，完成调胶过程，得到一种导电框胶。
具体的，所述步骤20中，所述石墨烯基树脂球与框胶按1:40的质量比进行混合，然后将混合物放入调胶筒内，再将调胶筒放入可以自转和公 转的旋转机中进行搅拌和脱泡工序。
本发明提供的一种导电框胶的制备方法，采用石墨烯基树脂球作为导电粒子，代替目前导电框胶中常用的导电金球，能够避免导电金球生产过程中产生的重金属污染问题；该方法中制备石墨烯基树脂球的工艺绿色环保，简单易控；制备石墨烯基树脂球时使用的氧化石墨烯是大规模制备石墨烯材料的有效前驱体，来源广泛，能够有效地降低成本。
进一步的，本发明还提供一种采用上述方法制备的导电框胶封装液晶显示面板的方法，具体操作为：
提供彩膜基板和阵列基板，使用机台在所述彩膜基板或者阵列基板上进行点胶，将所述彩膜基板与阵列基板对组后压合在一起，对导电框胶进行加热固化后，即得到采用含石墨烯基树脂球的导电框胶封装完毕的液晶显示面板，该液晶显示面板中，所述彩膜基板与阵列基板通过导电框胶电性连接；
在所述导电框胶的加热固化过程中，由于石墨烯基树脂球上的石墨烯片的优异导热能力，可以提高导电框胶的固化效率，使固化更均匀；另外，由于石墨烯的优良力学性能，可以有效缓和上下基板贴合时的压力，能够很好的支撑上下基板，保持基板间隙的稳定性，并保证液晶盒厚的一致性，减少边缘Mura的产生。
综上所述，本发明提供的一种石墨烯基树脂球的制备方法，使用绿色环保的闪光灯曝光法还原氧化石墨烯，工艺简单易控，可用于大规模生产。本发明提供的一种导电框胶的制备方法，采用石墨烯基树脂球作为导电粒子代替目前导电框胶中常用的导电金球，所述石墨烯基树脂球的制备工艺绿色环保，能够避免导电金球生产过程中产生的重金属污染；并且所述石墨烯基树脂球的制备过程中使用的氧化石墨烯是大规模制备石墨烯材料的有效前驱体，来源广泛，能够有效地降低成本。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (14)

  1. 一种石墨烯基树脂球的制备方法，包括以下步骤：
    步骤1、配制0.1-5mg/ml的氧化石墨烯溶液与1-10mg/ml的树脂球溶液，将所述0.1-5mg/ml的氧化石墨烯溶液与所述1-10mg/ml的树脂球溶液混合，磁力搅拌5min～1h后，得到一混合溶液，超声处理该混合溶液5min～2h，得到氧化石墨烯树脂球溶液；
    步骤2、过滤所述氧化石墨烯树脂球溶液，将过滤后得到的滤渣在空气中60℃～100℃下烘干0.5h～4h，完全去除水分，得到黄褐色的氧化石墨烯基树脂球粉末；
    步骤3、采用闪光灯对所述氧化石墨烯基树脂球粉末进行曝光还原，将树脂球表面包裹的氧化石墨烯还原成石墨烯，得到石墨烯基树脂球。
  2. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤1中，所述树脂球溶液由树脂球通过超声处理分散在水溶液中制得。
  3. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤1中，所述树脂球的材料为聚苯乙烯或聚丙烯酸树脂，所述树脂球的粒径范围为1～10μm。
  4. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤2中，使用抽滤装置对氧化石墨烯树脂球溶液进行过滤。
  5. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤1中，磁力搅拌的时间为10min，超声处理的时间为30min；所述步骤2中，将过滤后得到的滤渣在空气中80℃下烘干2h。
  6. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤3中，所述闪光灯的曝光能量范围为0.5-3J/cm2。
  7. 如权利要求1所述的石墨烯基树脂球的制备方法，其中，所述步骤3中，在曝光过程中，当所述氧化石墨烯基树脂球粉末颜色变黑，并伴有噼啪声时，暂时停止曝光并搅动该粉末，再继续曝光，重复曝光与搅动多次，直到无噼啪声为止，所述氧化石墨烯基树脂球粉末即被还原完毕。
  8. 一种石墨烯基树脂球的制备方法，包括以下步骤：
    步骤1、配制0.1-5mg/ml的氧化石墨烯溶液与1-10mg/ml的树脂球溶液，将所述0.1-5mg/ml的氧化石墨烯溶液与所述1-10mg/ml的树脂球溶液混合，磁力搅拌5min～1h后，得到一混合溶液，超声处理该混合溶液5min～2h，得到氧化石墨烯树脂球溶液；
    步骤2、过滤所述氧化石墨烯树脂球溶液，将过滤后得到的滤渣在空气中60℃～100℃下烘干0.5h～4h，完全去除水分，得到黄褐色的氧化石墨烯基树脂球粉末；
    步骤3、采用闪光灯对所述氧化石墨烯基树脂球粉末进行曝光还原，将树脂球表面包裹的氧化石墨烯还原成石墨烯，得到石墨烯基树脂球；
    其中，所述步骤1中，所述树脂球溶液由树脂球通过超声处理分散在水溶液中制得；
    其中，所述步骤1中，所述树脂球的材料为聚苯乙烯或聚丙烯酸树脂，所述树脂球的粒径范围为1～10μm；
    其中，所述步骤2中，使用抽滤装置对氧化石墨烯树脂球溶液进行过滤。
  9. 如权利要求8所述的石墨烯基树脂球的制备方法，其中，所述步骤1中，磁力搅拌的时间为10min，超声处理的时间为30min；所述步骤2中，将过滤后得到的滤渣在空气中80℃下烘干2h。
  10. 如权利要求8所述的石墨烯基树脂球的制备方法，其中，所述步骤3中，所述闪光灯的曝光能量范围为0.5-3J/cm2。
  11. 如权利要求8所述的石墨烯基树脂球的制备方法，其中，所述步骤3中，在曝光过程中，当所述氧化石墨烯基树脂球粉末颜色变黑，并伴有噼啪声时，暂时停止曝光并搅动该粉末，再继续曝光，重复曝光与搅动多次，直到无噼啪声为止，所述氧化石墨烯基树脂球粉末即被还原完毕。
  12. 一种导电框胶的制备方法，包括以下步骤：
    步骤10、采用如权利要求1所述的石墨烯基树脂球的制备方法制备出石墨烯基树脂球；
    步骤20、将石墨烯基树脂球与框胶进行混胶、搅拌和脱泡工序，完成调胶过程，得到一种导电框胶。
  13. 如权利要求12所述的导电框胶的制备方法，其中，所述步骤20中，所述石墨烯基树脂球与所述框胶按1:40的质量比混合。
  14. 如权利要求12所述的导电框胶的制备方法，其中，所述步骤20中，所述石墨烯基树脂球与所述框胶进行混合后，将混合物放入调胶筒内，再将调胶筒放入可以自转和公转的旋转机中进行搅拌和脱泡工序。
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