High-fluidity low-warpage liquid crystal polymer composition and preparation method as well as application thereof
A liquid crystal polymer, low warpage technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as the influence of composition fluidity
Active Publication Date: 2012-10-03
KINGFA SCI & TECH CO LTD +1
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Patent CN 101200641A discloses a liquid crystal polymer composition and a molded product prepared therefrom. This invention improves the warpage performance of the product by adding talcum powder with a certain aspect ratio, but does not mention whether the composition impact on the mobility of
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[0026] The present invention will be further described below through specific embodiments. The following examples are preferred implementation forms of the present invention, but the implementation manners of the present invention are not limited by the following examples.
[0027] The raw materials used in the examples and comparative examples are now described as follows, but not limited to these materials:
[0028] Liquid crystal polymer: Xydar SRT-802, a paraben / biphenol / terephthalic acid (PHBA / BP / TA) terpolymer copolyester with a melting point of 325°C.
[0029] Polycarbonate (PC): grade 131, melt index 3.5g / 10min, SABIC.
[0030] Boron nitride: particle size 2-10μm, Germany ESK.
[0031] Glass beads: particle size 5-12μm, 3M.
[0032] Its preparation method: first pre-dry the thermotropic liquid crystal polymer and polycarbonate, control the water content within 0.02%, mix the dried thermotropic liquid crystal polymer, polycarbonate and other additives, and then extrud...
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Abstract
The invention discloses a high-fluidity low-warpage liquid crystal polymer composition and a preparation method as well as application thereof. The high-fluidity low-warpage liquid crystal polymer composition comprises the following components in percentage by weight: 20-70 percent of thermotropic liquid crystal polymer with melting point of at least 300 DEG C, 20-70 percent of at least one filling material, 2-20 percent of low-melt-index polycarbonate and 0-5 percent of other additives, wherein the melt index of the low-melt-index polycarbonate is 3-6 g / 10 min under the conditions of 300 DEGC and 1.2 kg. The preparation method of the high-fluidity low-warpage liquid crystal polymer composition comprises the following steps of: pre-drying the thermotropic liquid crystal polymer and the polycarbonate to control the water content to be within 0.02 percent; uniformly mixing the dried thermotropic liquid crystal polymer and polycarbonate and the other additives and then adding into an extruder from an extruder main feed port; adding the filling material from a rear section of a cylinder; performing melt extrusion; and granulating. The composition can meet the requirements on super high fluidity of a material during thin wall forming; and an obtained product has low warpage and high wear resistance and can be widely applied to the fields of electronic and electrical industries, automobiles, household appliances, aerospace, other industrial applications.
Description
technical field [0001] The invention relates to a liquid crystal polymer composition, in particular to a liquid crystal polymer composition with high fluidity and low warpage, its preparation method and application. Background technique [0002] Thermotropic liquid crystal polymer (TLCP) has an unusually regular fibrous structure due to the orientation of its macromolecular chains in the liquid crystal state. It has special properties and high product strength, which is no less than that of metals and ceramics. It has excellent mechanical properties, dimensional stability, optical properties, electrical properties, chemical resistance, flame retardancy, processability, heat resistance and low thermal expansion coefficient, and is widely used in electronic and electrical components. [0003] Thermotropic liquid crystal polymer (TLCP) itself has excellent molding fluidity, but in order to meet the requirements of flatness of electronic devices, TLCP must be modified before it ...
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Login to View More IPC IPC(8): C08L67/03C08L69/00C08K3/38C08K7/20C09K19/38
Inventor 易庆锋蔡彤旻麦杰鸿蒋智强姜苏俊宁方林叶南飚
Owner KINGFA SCI & TECH CO LTD