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Low-dielectric liquid crystal polyester composition and preparation method thereof

A technology of liquid crystal polyester and composition, which is applied in the field of low dielectric liquid crystal polyester composition and preparation, and can solve problems such as poor mechanical properties, high temperature resistance, high fluidity, low dielectric and high strength performance, foaming deformation, etc. , to achieve the effect of simple steps and non-strict process

Active Publication Date: 2020-04-14
JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its dielectric constant can be reduced to less than 3, but because the melting point of PPS resin itself is low, only about 280 degrees, there is also a risk of foaming and deformation during SMT processing
And because the reinforcing effect of hollow glass microspheres is too low, the mechanical properties of this material are poor
[0011] At present, there is no solution on the market that can make materials meet high temperature resistance, high fluidity, low dielectric and high strength properties at the same time

Method used

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  • Low-dielectric liquid crystal polyester composition and preparation method thereof
  • Low-dielectric liquid crystal polyester composition and preparation method thereof
  • Low-dielectric liquid crystal polyester composition and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0108] Preparation of LCP(A1)

[0109] In a reactor equipped with a stainless steel C-type stirrer, torque gauge, nitrogen conduit, thermometer, pressure gauge and reflux condenser, 1027.5 g of 4-hydroxybenzoic acid (HBA), 470 g of 6-hydroxy-2-naphthoic acid ( HNA), 1122 g of acetic anhydride, 200.0 g of acetic acid. The reactor was purged by evacuating and flushing with dry nitrogen, and 0.3 g of 1-methylimidazole was added. Under nitrogen, with stirring at 150 rpm, the temperature was raised to 150°C over 60 minutes and refluxed by maintaining at this temperature for 60 minutes. After 13.0 g of phenol was added to the reactor, the temperature was raised to 340°C in 120 min. During this time, the by-product acetic acid was removed by distillation. After constant temperature at 340°C for 30min, the pressure was gradually reduced to about 100pa within 20min to maintain a vacuum until the torque increased by more than 30%, the reaction was terminated, and the prepolymer was t...

Embodiment 1

[0119] This example provides a preparation method of a low-dielectric liquid crystal polyester composition, and the steps include:

[0120] S1: 70 parts by weight of LCP (A1) is plasticized and melted through a twin extruder to obtain a first melt, and the plasticizing temperature is 320°C;

[0121] S2: Input the first melt into the grooved roll contact type dipping roll system die (4 dipping rolls, the diameter of the dipping rolls is 25 mm, and the distance between the dipping rolls is 30 mm), and 30 parts by weight of LCP (B1) fibers are also input into the dipping die head, the dipping time was 3 min, and the temperature of the dipping tank was 325 ° C to obtain the second melt;

[0122] S3: pulling the second melt out of the dipping head at a speed of 300 mm / s, cooling and dicing to obtain the low-dielectric liquid crystal polyester composition. The test results are recorded in Table 1.

Embodiment 2

[0124] This example provides a preparation method of a low-dielectric liquid crystal polyester composition, and the steps include:

[0125] S1: mixing 60 parts by weight of LCP (A1) and 10 parts by weight of hollow glass microspheres, adding them to a double extruder for plasticization and melting to obtain a first melt, and the plasticizing temperature is 315°C;

[0126] S2: Input the first melt into the grooved roll contact type dipping roll system die (4 dipping rolls, the diameter of the dipping rolls is 25 mm, and the distance between the dipping rolls is 30 mm), and 30 parts by weight of LCP (B1) fibers are also input into the dipping die head, the dipping time was 3 min, and the temperature of the dipping tank was 325 ° C to obtain the second melt;

[0127] S3: pulling the second melt out of the dipping head at a speed of 200 mm / s, cooling and dicing to obtain the low-dielectric liquid crystal polyester composition. The test results are recorded in Table 1.

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Abstract

The embodiment of the invention provides a low-dielectric liquid crystal polyester composition and a preparation method thereof. The low-dielectric liquid crystal polyester composition comprises 40-90% LCP (A) and 10-60% LCP (B) fibers, the melting point of the LCP is larger than or equal to 280 DEG C, the dielectric constant is lower than 3.5, the dielectric loss tangent angle is lower than 0.002, and the melting point of the LCP (B) fibers is higher than the melting point of the LCP (A) by 30 DEG C or above. The low-dielectric liquid crystal polyester composition has good flowing performance, the dielectric constant is lower than 3.5, the dielectric loss tangent angle is lower than 0.002, meanwhile, the tensile strength is larger than 150 MPa, and the temperature resistance requirement of the SMT manufacturing procedure is met.

Description

technical field [0001] The invention belongs to the technical field of dielectric materials, and particularly relates to a low-dielectric liquid crystal polyester composition and a preparation method. Background technique [0002] Dielectric materials, also known as dielectrics, are electrical insulating materials. According to the performance, there are high dielectric materials and low dielectric materials. For low-dielectric materials, with the rapid development of electronic information technology, electronic products are developing in the direction of light weight, high performance and multi-functionality, and it is more and more necessary to develop low dielectric constant (Dk) with good performance. <3) Materials. [0003] First of all, with the advent of the 5G era, the communication frequency is getting higher and higher, and the requirements for the transmission stability of electrical signals are getting higher and higher, so the requirements for the dielectr...

Claims

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Application Information

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IPC IPC(8): C08L101/12C08K7/28C08K7/14C08J5/04B29B15/14
CPCB29B15/14C08J5/043C08J2300/12C08K7/14C08K7/28C08L101/12C08L2205/025C08L2205/16
Inventor 金良文
Owner JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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