A liquid crystal polymer, its preparation method and a flexible printed circuit board prepared therefrom
A technology of liquid crystal polymer and aminobenzoic acid, which is applied in the direction of printed circuit, printed circuit parts, circuit substrate materials, etc., can solve the problem that the dielectric constant and dielectric loss cannot meet the demand, and achieve the reduction of dielectric constant and free Volume increase, solubility improvement effect
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[0021] The preparation method of the liquid crystal polymer, the method comprises the steps of:
[0022] Proportional acylation of p-hydroxybenzoic acid, methyl-containing aminobenzoic acid structure, p-phenylenediamine and 2,2-bis(4-hydroxy-3-tolyl)propane with acetic anhydride in the presence of a catalyst ;
[0023] Acylated p-hydroxybenzoic acid, aminobenzoic acid structure containing methyl groups, p-phenylenediamine and 2,2-bis(4-hydroxy-3-tolyl)propane under the action of a catalyst Transesterification with terephthalic acid.
[0024] In the preparation method of the liquid crystal polymer, the catalyst used in the acylation reaction and the transesterification reaction is one or any of sodium acetate, magnesium acetate, zinc acetate, stannous acetate, lead acetate, antimony trioxide, and potassium acetate. Several combinations.
[0025] In the preparation method of the liquid crystal polymer, the amount of the catalyst used in the transesterification reaction accoun...
Embodiment 1
[0032] (1) Acylation reaction
[0033] Take 60 moles of p-hydroxybenzoic acid, 4 moles of aminobenzoic acid structure containing methyl groups, 14 moles of p-phenylenediamine, and 4 moles of 2,2-bis(4-hydroxy-3-tolyl)propane, and carry out acylating in acetic anhydride respectively. After the reaction, the product was poured into ice water to precipitate a precipitate, which was filtered, washed, and dried.
[0034] (2) Esterification reaction
[0035] In the reactor with nitrogen and condenser, add acylated p-hydroxybenzoic acid, p-phenylenediamine, 4,4'-(1-phenylethyl)bisphenol, 18 moles of terephthalic acid in The polymerization is carried out under the action of the catalyst zinc acetate, firstly raise the temperature to 120°C and stay for 30 minutes, then start the temperature rise reaction, and at the same time pass nitrogen gas to remove the by-product acetic acid, when the reaction liquid turns from white to clear and then to turbid, further heat up , and speed up th...
Embodiment 2
[0039] The difference between this embodiment and Example 1 is that the amount of each monomer is p-hydroxybenzoic acid, aminobenzoic acid structure containing methyl, terephthalic acid, p-phenylenediamine, 2,2-bis(4 -Hydroxy-3-tolyl) propane molar percentages are 50%, 10%, 20%, 18%, 2%. The dielectric constant and dielectric loss of the prepared liquid crystal polymer film are 2.9 (1GHz) and 0.004 (1GHz) respectively, and the mass fraction dissolved in the solvent N,N-dimethylacetamide is 27%.
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