Liquid crystal polyester composition and preparation method thereof

A technology of liquid crystal polyester and its composition, which is applied in the field of liquid crystal polyester composition and its preparation, to achieve the effects of good fluidity, high dielectric constant, and high mechanical strength

Inactive Publication Date: 2020-03-24
JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high dielectric and low loss polymer materials cannot meet the above requirements at the same time

Method used

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  • Liquid crystal polyester composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In a reactor equipped with a stainless steel C-type stirrer, torque gauge, nitrogen conduit, thermometer, pressure gauge and reflux condenser, 994.5 g of p-hydroxybenzoic acid, 299.0 g of terephthalic acid, 99.7 g of isophthalic acid Dicarboxylic acid, 446.9 g of 4,4'-dihydroxybiphenyl, 1347.6 g of acetic anhydride, 200.0 g of acetic acid. The reactor was purged by evacuation and flushing with dry nitrogen, and 0.18 g of 1-methylimidazole was added. Under nitrogen protection, with stirring at 75 rpm, the temperature was raised to 150° C. over 60 minutes and refluxed by keeping at this temperature for 60 minutes. After adding 13.0 g of benzylamine and 1.84 g of calcium acetate into the reactor, the temperature was raised to 340° C. within 20 min. During this time, by-product acetic acid was removed by distillation. After keeping the temperature at 340°C for 30 minutes, gradually reduce the pressure to about 100 Pa within 20 minutes and keep the vacuum until the torque ...

Embodiment 2

[0044] In a reactor equipped with a stainless steel C-type stirrer, torque gauge, nitrogen conduit, thermometer, pressure gauge and reflux condenser, 994.5 g of p-hydroxybenzoic acid, 399.0 g of terephthalic acid, 480 g of 1,5 '-Dihydroxynaphthalene, 1347.6 g of acetic anhydride, 200.0 g of acetic acid. The reactor was purged by evacuation and flushing with dry nitrogen, and 0.18 g of 1-methylimidazole was added. Under nitrogen protection, with stirring at 75 rpm, the temperature was raised to 150° C. over 60 minutes and refluxed by keeping at this temperature for 60 minutes. After adding 13.0 g of benzylamine and 1.84 g of calcium acetate into the reactor, the temperature was raised to 340° C. within 20 min. During this time, by-product acetic acid was removed by distillation. After keeping the temperature at 340°C for 30 minutes, gradually reduce the pressure to about 100 Pa within 20 minutes and keep the vacuum until the torque increases by more than 30%. The reaction is ...

Embodiment 3

[0046] In a reactor equipped with stainless steel C-type stirrer, torque meter, nitrogen conduit, thermometer, pressure gauge and reflux condenser, add 600g of p-hydroxybenzoic acid, 376g of 2-hydroxy-6-naphthoic acid, 299.0g of p-hydroxybenzoic acid Phthalic acid, 446.9 g of 4,4'-dihydroxybiphenyl, 1347.6 g of acetic anhydride, 200.0 g of acetic acid. The reactor was purged by evacuation and flushing with dry nitrogen, and 0.18 g of 1-methylimidazole was added. Under nitrogen protection, with stirring at 75 rpm, the temperature was raised to 150° C. over 60 minutes and refluxed by keeping at this temperature for 60 minutes. After adding 13.0 g of benzylamine and 1.84 g of calcium acetate into the reactor, the temperature was raised to 340° C. within 20 min. During this time, by-product acetic acid was removed by distillation. After keeping the temperature at 340°C for 30 minutes, gradually reduce the pressure to about 100 Pa within 20 minutes and keep the vacuum until the t...

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Abstract

The invention belongs to the field of materials, and discloses a liquid crystal polyester composition which mainly comprises liquid crystal polyester and titanium dioxide. The melting point of the liquid crystal polyester is higher than or equal to 280 DEG C, and the dielectric loss tangent angle of the liquid crystal polyester is less than 0.002. According to the invention, the titanium dioxide is used as a dielectric material and combined with the liquid crystal polyester, and the titanium dioxide with a high dielectric constant and the liquid crystal polyester with the melting point of higher than or equal to 280 DEG C and the dielectric loss tangent angle of less than 0.002 act together, so that the obtained composition has a high dielectric constant and low dielectric loss, the dielectric constant is greater than 6.0, and the dielectric loss tangent angle is less than 0.005. Meanwhile, the mechanical property of the obtained composition is further improved, the fluidity is good, the mechanical strength is high, the composition is resistant to high temperature, and foaming is avoided in the reflow soldering process.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a liquid crystal polyester composition and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology and nanotechnology, embedded capacitors have been widely used in various microelectronic systems. Among them, the miniaturization and weight reduction of electronic components have put forward higher requirements for the integration, safety and life of the devices. Under the condition of constant electric field intensity and operating frequency, the energy storage effect of capacitors depends on the dielectric constant (Dk) of the material, while the heat generation performance depends on the dielectric loss tangent (Df) of the material. Therefore, in the case of limited volume of microcapacitors, to develop capacitor elements with high power and high safety factor, dielectric materials with higher dielectric constant and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K3/22C08K7/14
CPCC08K3/22C08K7/14C08K2003/2241C08K2201/003C08L67/00
Inventor 郑红专金良文梁永华
Owner JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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