Huawei 5G flexible screen stunning appearancePosted: 2019-02-27

  • What is the impact of the arrival of the flexible screen era on the high-end calcium carbonate market? 

    February 24

    Barcelona, ​​Spain

    Huawei released the first 5G folding screen mobile phone


    Huawei Mate X

    Body size is 8 inches

    Asymmetric valgus folding



    This domestic black technology appeared

    Immediately caused onlookers

    Boarding a hot search

    Become a hot spot for discussion among the whole people


    So what is it special?

    Let's take a look together


    Before this

    Samsung and LG also released a dual-screen folding mobile phone

    In the eyes of the industry

    As more and more mobile phone manufacturers push folding screen phones

    Flexible OLED industry chain will benefit

    Domestic panel makers will also usher in development opportunities



    The era of flexible screens has arrived


    According to the forecast of Shanghai Securities

    Adopted in smart terminals of Huawei, Samsung and other companies

    Bend the screen under the push

    Expected by the end of 2020

    AMOLED market is expected to reach US$67 billion

    Annual compound growth rate will exceed 45%


    With BOE, TCL, Cigna, shentianma led flexible OLED industry giant after 10 years of independent research and development, has been in downstream applications eve of the outbreak, in addition to manufacturing itself, its upstream materials and equipment industry chain will usher in a historic opportunity.


    So, what technologies are behind the hot and flexible screen?




    Flexible screens generally refer to flexible OLEDs. Compared with the traditional screen, the flexible screen has obvious advantages, not only is the volume thinner, but also the power consumption is lower than the original device, which helps to improve the endurance of the device. At the same time, based on its flexible and flexible characteristics, its durability is also It is much higher than the traditional screen and reduces the probability of accidental damage to the device.




    As early as 1974, Gyricon e-paper at the Xerox Palo Alto Research Center gave birth to the concept of flexible displays. This material, which can be bent like paper and can directly display images, has always been attractive since its presentation, but it has not been able to get out of the laboratory for a long time due to technical costs and other issues. In the era of feature machines, NEC, Kyocera, Sony and other manufacturers have introduced electronic products similar to folding screens. This folding screen phone is more like a variant of a flip phone. It uses an ultra-narrow bezel + hinge design to simply stack two hard screens together. This is not really a flexible folding screen.


    By 2012, the flexible screen made a breakthrough, screen maker Plastic Logic produced a flexible display that was completely made of plastic materials, and in 2013 showed the flexible phone MorePhone, which was jointly built with Intel.


    In 2013, mobile phone manufacturers Sony and Samsung invested in related technologies for flexible screens at almost the same time. After five years, the folding screen mobile phone finally showed a breakthrough entity in front of the public.After several twists and turns, in October 2018, Rouyu released the world's first folding screen mobile phone soft party. In 2019, more mobile phone manufacturers will join the development and promotion of flexible screen mobile phones.



    So what kind of film and materials are involved in our flexible film display for our film practitioners? Let's take stock together.


    1. Polyimide film (PI film) 

    Although the flexible screen can be bent, if it is bent frequently, fatigue problems like metal paper will occur. If the flexible screen is bent for a long time and used for a long time, after being subjected to multiple compression and tensile stresses, crease damage may occur in the middle of the screen. In addition, after the board and components are subjected to a large amount of bending and non-bending, they may cause damage or other accidents during folding. Existing glass panels can not meet their high frequency requirements. Mobile phone manufacturers mainly use polyimide film (transparent PI film) to replace the existing glass cover. CPI itself has good foldability, but PI material can not meet the hardness. It is required to add a coating on the surface of the PI film to enhance the hardness. 


    The global patent application for transparent polyimide film accounts for only 9% of the global patent application for polyimide film, and the patent application for transparent polyimide film only accounts for 2.6 of the patent application for polyimide film in China. %about. In general, the patented technology reserves in the field of transparent polyimide films are low. Globally, manufacturers with CPI membrane technology capabilities include Kolon, SKC and Sumitomo Chemical, and domestic companies involved in the development of transparent polyimide films are also emerging.


    2. Polyester film (BOPET film)

    Polyester film (BOPET film) is the base film or base film of many functional films in many flexible display screens. The most commonly used mobile phone panel screen touch core ITO film (indium tin oxide semiconductor transparent conductive film) is BOPET. The film is a substrate prepared by coating a conductive material indium tin oxide on the surface of the film, but the brittleness of ITO is not suitable for flexible screen applications. The industry proposes to use nano-silver line AgNWs with seven versatility to replace ITO as the touch core conductive material, but the problem that the nano silver wire is difficult to make narrow borders and etch marks is still needed to be further improved. The core conductive material replacing ITO is mainly composed of nano silver conductive film, but the substrate of nano silver conductive film is mainly BOPET film. 


    In the OLED bending process, in order to prevent damage and bending of the screen, it is generally required to adhere a protective film on the bottom of the panel, the protective film has good rigidity, and the base material is also a BOPET film.


    3. Cyclic olefin polymer film (COP film)

    Developed and produced by Japan's Swiss company, it is a resin that has been used in medical treatment for a long time because of its high transparency, low birefringence, low water absorption, high rigidity, high heat resistance, and good water vapor tightness. In the field of high transparency and anti-UV conductive film requirements, COP film is used instead of BOPET as a substrate.


    4. Liquid crystal polymer film (LCP film)

    LCP plastic raw material full name Liquid CrystalPolymer, Chinese name liquid crystal polymer, it is a new type of polymer material, generally exhibits liquid crystallinity in the molten state. LCP film has good high strength, high rigidity, high temperature resistance, electrical insulation and other properties, and has better water resistance than PI film, so it is a film type superior to PI film. It is widely used in flexible screens, antennas for flexible phones, and diaphragms for speakers.


    5.PE protective film

    In addition to the protective film that prevents the panel from being broken and broken, in the process of production and transportation of the flexible screen, it is necessary to consume a relatively large amount of polyethylene as a self-adhesive protective film of the substrate at one time, for protecting the electronic screen from being scratched by foreign matter or Intermediate links are defaced. Common self-adhesive materials include EVA, ultra low density polyethylene, and polyolefin plastomer resins. Self-adhesive protective film features: simple processing; long-term use of no glue; low material cost; less product varieties, used in high-end electronic equipment.


    6. Polydimethylsiloxane film (PDMS film)

    PDMS film belongs to a kind of polymer elastic polymer film, which is prepared by special process using polydimethylsiloxane as raw material. Due to the nature of the polydimethylsiloxane material, a certain specific energy is imparted to the PDMS film.Elasticity, low Young's modulus, excellent gas permeability, chemical stability, thermal stability, low temperature flexibility (-60~200 °C to maintain excellent performance), full transparency, biocompatibility. At present, PDMS films have different applications in high-end products such as scar stickers, electronic flexible devices, microfluidic chips, gas separation technology, and smart wearable products.




    Behind these films, calcium carbonate will usher in a historic opportunity!





    Calcium carbonate is low in price, white in color and good in performance. It is an inorganic filler widely used in rubber, plastic and film. The addition ratio can reach 40%. The light calcium after surface activation treatment can be widely used in the film industry, except that the amount of modifier required for light calcium is larger than that of the same order, so the production cost is higher. Calcium carbonate is widely used in thin films. Adding appropriate calcium carbonate to the polymer can reduce the cost and improve some aspects of performance and increase its added value.


    1. Characteristics of calcium carbonate as a plastic film filler

    As a filler for polymer materials, calcium carbonate can increase the dimensional stability, rigidity, heat resistance of the material, and reduce costs. However, it will also increase its density. If it is used improperly, it will lead to deterioration of mechanical properties and gloss of material strength, impact resistance and toughness.


    As a filler of a film material, calcium carbonate powder is a hydrophilic inorganic compound having a hydrophilic hydroxyl group on its surface and exhibiting a strong basicity. The hydrophilic oleophobic property makes the calcium carbonate have poor affinity with the organic high polymer, is easy to agglomerate, and is unevenly dispersed inside the high polymer, resulting in interface defects between the two materials, and the direct application effect is not good. These drawbacks become more pronounced as the amount of filling increases, such as overfilling or even rendering the article unusable. For this we need to modify the calcium carbonate.


    2. Preparation method of calcium carbonate film


    (1) Filling film

    In the development and application of membranes, inorganic calcium carbonate powder is the most effective and commonly used filler for polymer materials. The filling method is simple and is the most widely used method. However, since calcium carbonate has poor compatibility with the polymer, if it is directly added, the filler is difficult to be uniformly dispersed, resulting in difficulty in processing of the filling system, poor product properties, and limited use of the filler. In order to solve these problems, calcium carbonate is usually subjected to surface treatment.


    (2) Film formation by in situ precipitation method

    Calcium ions are added before the film formation and carbonate ions are added or carbon dioxide is introduced, and the calcium carbonate particles generated in situ are deposited on the surface of the polymer. The composite film prepared by in-situ deposition method can be found that the calcium carbonate and the polymer are not blended in a simple physical manner, but chemical adsorption complexation occurs, thereby solving the compatibility of calcium carbonate and polymer. The problem is that the obtained film has a uniform texture and good performance. This method is relatively new and has great potential for development, but it is currently not much used.


    3. Effect of calcium carbonate on film properties


    The film-forming effect of polyethylene is better, and the film properties of different varieties are different. The polyethylene film added with calcium carbonate has improved performance in many aspects.


    (1) Mechanical properties

    The LLDPE/mPE was modified with ultrafine heavy calcium carbonate. The results show that the addition of 5% calcium carbonate increases the dart impact strength of the film by 13.2%, the elongation at break by about 5%, and the tensile strength is also slightly improved.


    (2) Thermal properties

    After the filler is added, since the thermal stability of the calcium carbonate is good, the thermal expansion coefficient and the shrinkage rate of the product are lowered, and the thermal stability of the product is increased as the filler is increased.


    (3) Other performance

    Using calcium carbonate, talc powder material modified polyethylene (LDPE, LLDPE) film anti-mist, calcium-modified polyethylene film without dripping longer duration, can be premixed with improved anti-fog film drops Anti-fog drop performance.Compared with the blank film, the ability of the calcium carbonate modified polyethylene film to block infrared rays and ultraviolet rays has been improved. The addition of calcium carbonate film can also promote film degradation and play an active role in environmental protection.


    Further, the addition of calcium carbonate can also improve the moisture permeability and the gas permeability of the polyethylene film.


    4, the application of calcium carbonate in the film

    Many high polymers can be used for film formation. The film has a wide range of applications, mainly used as packaging materials, protective agricultural films, mulch films, and the like.


    (1) Application in polyethylene film

    The addition of calcium carbonate to polyethylene has a good film-forming effect. It is currently the most widely used and most widely used plastic packaging film, accounting for more than 40% of the plastic packaging film consumption.


    (2) Application in polypropylene film

    Films made of polypropylene have good properties. Except for a small amount of polypropylene film using blow molding, most of them use biaxial stretching technology to produce highly oriented films. The biaxially stretched polypropylene film is widely used in printing, lamination, adhesive tape, etc. due to its non-toxicity and excellent mechanical strength.


    (3) Application in the film of polyvinyl chloride and its related varieties

    Calcium carbonate can be used for a polyvinyl chloride film, and when the amount thereof is increased within a prescribed range, the tensile strength and elongation at break of the film can be increased, because the calcium carbonate particles themselves have a function of preventing the development of silver streaks. Calcium carbonate can also be used for the polyvinylidene chloride film. In addition to adjusting the barrier properties of the film, the addition of calcium carbonate can also improve the processing properties of the polyvinylidene chloride and the mechanical properties of the film.


    (4) Application in natural latex film

    Calcium carbonate is an excellent filler for rubber. The active fine calcium carbonate filled rubber can show a certain reinforcing property, which can reduce the amount of raw rubber and reduce the cost. The latex grade special calcium carbonate and the modified nano calcium carbonate are respectively added into the natural latex and formed into a film, and the two kinds of calcium carbonate are uniformly dispersed in the rubber matrix, and the hardness of the natural latex film added with the calcium carbonate is slightly It has improved, tensile strength is increased, and heat aging resistance is improved.


    (5) Application in polyurethane film

    Calcium carbonate can be used to prepare calcium carbonate/polyurethane composite membrane material. In the prepared membrane, the calcium carbonate particles are uniform in size and well dispersed, and polyurethane and calcium carbonate are effectively compounded, the bonding strength is high, and the hardness of the composite membrane is obviously improved. .


    (6) Application in chitosan film

    Calcium carbonate/chitosan composite membranes are not directly added to chitosan by using calcium carbonate as a filler, but the chitosan/calcium salt is used to obtain high strength by in situ precipitation method through interaction with carbonate. Calcium carbonate/chitosan composite film. Experiments show that the calcium carbonate/chitosan film prepared by this method has high tensile strength, good water resistance and thermal stability, and has potential applications in industry and medicine.


    5. Application prospects

    (1) Calcium carbonate is widely used in the film. How to increase the amount of calcium carbonate to further reduce the cost and improve the comprehensive performance of the membrane has become the most concerned issue for most enterprises.

    (2) At the same time, some experts are further studying the application of calcium carbonate in other membrane materials, expanding the use of calcium carbonate, enhancing its comprehensive performance and reducing costs.


    (3) The method for preparing the calcium carbonate film is mainly to fill the calcium carbonate method and the in-situ precipitation method to form a film, and both methods have advantages. The method of filling calcium carbonate is more common, but it still needs to improve performance and reduce cost. The membrane prepared by in-situ precipitation method has better performance, and there are not many applications at present, which needs further development.

    Ultra fine calcium carbonate powder grinding plant.jpg

    CLUM ultrafine vertical mill is designed for high-end calcium carbonate production


    CLUM Ultrafine Vertical Mill manufactured by Shanghai Clirik Machinery Co.,Ltd has been developed as the equipment for ultrafine powder grinding and separation. Its production introduces talents in ultrafine powder production and machine manufacturing industry, and absorbs the technologies and experience of ultrafine vertical mills from Germany, Japan and Taiwan, etc.

    CLUM Ultrafine Vertical Mill is the specialized ultrafine grinding equipment for non-metallic ores. It suits for grinding non-flammable, non-explosive brittle materials with Moh’s hardness below 6 such as limestone, calcite, marble, talc, barite, brucite, wollastonite, pyrophyllite, dolomite, kaolin, lime, saponite, etc.

    The mill takes Automatic Central Control System, widely used in paper-making, plastic, rubber, artificial stone, painting and coating industries. It is the specialized equipment for producing filler of large-scale paper-making plants and calcium carbonate for coating, and processing other large-scale ultrafine powder.

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