摘要:
The invention relates to a process for preparing a semi-aromatic polyamide from diamine and dicarboxylic acid, comprising steps of •(i) dosing a liquid diamine to an agitated powder comprising an aromatic dicarboxylic acid thereby forming a powder comprising a diamine/dicarboxylic acid salt (DD-salt), and •(ii) solid-state polymerizing the DD-salt to obtain the polyamide.
摘要:
The invention relates to a process for the preparation of a semi-crystalline semi-aromatic polyamide copolymer (Co-PA) having a melting temperature (Tm-Co-PA) of at least 300° C., comprising steps of (a) preparing a first semi-crystalline semi-aromatic polyamide (A), having a melting temperature (Tm-A) of at least 310° C.; and consisting of repeat units derived from 45-50 mol % terephthalic acid; 47.5-50 mol % of diamine; and 0-5 mol % of one or more other amine and/or acid group containing components; the mol % being relative to the total molar amount of said amine and/or acid group containing components; and wherein poly-amide (A) is prepared by a process comprising direct solid-state polymerization of a diamine-dicarboxylic acid salt of the terephthalis acid and the diamine; (b) providing a polyamide (B), being an amorphous polyamide having a glass transition temperature (Tg-B) below Tm-A, or a second semi-crystalline polyamide having a melting temperature (Tm-B) below Tm-A, or a combination of the amorphous polyamide and the second semi-crystalline polyamide; (c) heating and melt-mixing polyamide (A) and polyamide (B), thereby obtaining a miscible polymer melt with a temperature (T-melt) above Tm-A; and (d) cooling the melt to a temperature below the solidification temperature of the melt, thereby obtaining a solid semi-crystalline semi-aromatic polyamide copolymer.
摘要:
The polyamide resin composition of the present invention comprises a polyamide resin, (B) 0.5 to 400 mmol of a phosphorus compound in terms of a phosphorus element concentration, and (C) 0.5 to 400 mmol of a metal element, per kg of the polyamide resin, wherein the content of an apatite-based compound is 0.3 parts by mass or smaller based on 100 parts by mass of the polyamide resin, and the viscosity number [VN] of the polyamide resin is 160 mL/g or higher.
摘要:
Provided are [1] a xylylenediamine composition containing xylylenediamine and a compound represented by the following general formula (1), wherein the content of the compound represented by the general formula (1) is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and a method for producing a polyamide resin including the steps of introducing a compound represented by the following general formula (1), a diamine including xylylenediamine (but excluding the compound represented by the general formula (1)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the compound represented by the general formula (1) to be introduced is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine, where, in the general formula (1), n and m each independently represent an integer of 0 to 6, excluding the case where n and m are both 1.
摘要:
A method for manufacturing a polyamide resin, according to the present invention, comprises the steps of: obtaining a low-order condensate in a solid state through polycondensation of dicarboxylic acid and diamine in the presence of a compound having a wt % of approximately 0.01 to 0.5 with respect to the total amount of the dicarboxylic acid and the diamine; and solid-state polymerizing the low-order condensate, wherein the dicarboxylic acid contains, with respect to the total amount of the dicarboxylic acid, approximately 70 mol % of aliphatic dicarboxylic acid having 9 to 12 carbon atoms, wherein the diamine contains, with respect to the total amount of the diamine, approximately 50 mol % of diamine represented by previously indicated chemical formula 1, wherein the range of the maximum temperature of the polycondensation reaction is approximately 200 to 230° C., and the maximum reaction temperature of the solid-state polymerization is approximately 170 to 230° C.
摘要:
The invention relates to a branched polyamide prepolymer obtained or obtainable by polymerization of a polyamide forming monomer mixture, comprising AA-BB repeat units and branching units derived from diamines (monomer A) dicarboxylic acids (monomer B), and/or a salt of A and B, and a higher functional monomer (monomer C) present in a molar amounts defined by formula I and formula II: MC=(Q/FC)*(MA+MB) (Formula I) and R=((MA*2)+(MC*FCA))/((MB*2)+(MC*FCB)) (Formula II) wherein—MA, MB and MC represent the molar amounts of repeat units derived from the monomers A, B and C, respectively; —FC represent the functionality of monomer C, and is equal to FC-A+FC-B; —FC-A is the number of the amino functional groups comprised by monomer C; —FC-B is the number of carboxyl functional groups or precursor groups thereof comprised by monomer C; —Q is a number in the range of 0.06-1.00; and —R is a number in the range of 0.7-1.3, which polyamide prepolymer has a viscosity number (VN), measured according to ISO 307, in the range of 7-30 mL/g. The invention also relates to a process for preparing a branched polyamide polymer, comprising (1) a melt-mixing step wherein an essentially linear polyamide (pre)polymer and a branched polyamide prepolymer are provided to and mixed and heated in a melt mixing apparatus, thereby forming a mixed melt, and the mixed melt being cooled, thereby forming a solid mixture; and (2) a solid state post condensation step wherein the solid mixture is post-condensed at elevated temperature in the solid state, thereby forming a high molecular weight branched polyamide polymer.
摘要:
A process used to cast films including: mixing BBL and a room temperature molten salt from a range of about 35:65 weight ratio, dissolving the mixture in about 1% methanesulfonic acid to produce a BBL solution, drop casting the solution onto glass or gold coated glass at 140° C. in air and heating for about 2 hours to produce films, drying the films in a vacuum oven at about 100° C. for at least 24 hours under dynamic vacuum, and rinsing the films to remove residual ionic liquid.
摘要:
The invention relates to a high molecular weight branched polyamide polymer comprising (a) blocks predominantly consisting of AA-BB repeat units, (b) blocks predominantly consisting of AB repeat units, and (c) branching units. The invention also relates to a process for the preparation of the high molecular weight branched polyamide polymer, comprising (1) a melt-mixing step wherein an essentially linear polyamide prepolymer (X-1), predominantly consisting of AA-BB repeat units, an essentially linear polyamide (pre)polymer (X-2), predominantly consisting of AB repeat units, and a branching agent are provided to and mixed and heated in a melt mixing apparatus, thereby forming a mixed melt, and the mixed melt being cooled, thereby forming a solid mixture; and (2) a solid state post condensation step wherein the solid mixture is post-condensed at elevated temperature in the solid state, thereby forming a high molecular weight branched polyamide polymer.
摘要:
Disclosed herein is a method for preparing a polycondensation resin. The method includes preparing a low degree condensate; and solid phase polymerizing the low degree condensate, wherein a granular molded article is introduced into the solid phase polymerization. The method enables efficient manufacture of high quality resins without problems such as agglomeration or scaling of a low degree condensate in pipes.
摘要:
A process used to cast films including: mixing BBL and a room temperature molten salt from a range of about 35:65 weight ratio, dissolving the mixture in about 1% methanesulfonic acid to produce a BBL solution, drop casting the solution onto glass or gold coated glass at 140° C. in air and heating for about 2 hours to produce films, drying the films in a vacuum oven at about 100° C. for at least 24 hours under dynamic vacuum, and rinsing the films to remove residual ionic liquid.