摘要:
A polyamide resin is a polymer of an adipic acid-containing dicarboxylic acid component and an m-xylenediamine-containing diamine component, wherein the polymer includes about 100 ppm or less of phosphorus and about 100 ppm or less of sodium (Na), and has a gel content of about 0.5% or less as measured on a specimen prepared by melting about 10 g of the polymer at about 260° C., maintaining the molten polymer for about 30 minutes, and then cooling the molten polymer to room temperature. The polyamide resin can exhibit excellent heat resistance and can reduce or prevent gel generation upon polymerization or molding.
摘要:
The continuous solid-state polymerisation device of the present invention comprises: a feeder for continuously introducing a prepolymer; a horizontal reactor which is connected via a first connecting part to the feeder and receives the prepolymer from the feeder so as to subject same to solid-state polymerisation, wherein the reactor itself is rotated; a stirring device which comprises a stirring shaft rotating inside the horizontal reactor, in the direction opposite to that of the rotational axis of the horizontal reactor, and comprises stirring blades joined vertically to the stirring shaft; and a chamber which is connected via a second connecting part to the horizontal reactor and, once the solid-state polymerisation has been completed, receives the resulting polymer discharged from the horizontal reactor, and, here, the feeder, the horizontal reactor and the chamber are in a vacuum state. The continuous solid-state polymerisation device prevents the formation of prepolymer stagnation zones, and allows solid-state polymerisation to take place continuously in the vacuum state without any inert gas.
摘要:
A copolymerized polyamide resin includes a polymer of a monomer mixture comprising a dicarboxylic acid component comprising adipic acid and a dicarboxylic acid represented by Formula 1, wherein each R1 is independently a C1 to C5 alkyl group and a is an integer from 0 to 4, and a diamine component comprising m-xylene diamine and a diamine represented by Formula 2, wherein A is a single bond or a C1 to C10 hydrocarbon group, R2 and R3 are each independently a C1 to C5 alkyl group, and b and c are each independently an integer from 0 to 4, wherein the copolymerized polyamide resin has a difference between a melting temperature (Tm) and a crystallization temperature (Tc) of about 50° C. or more. The copolymerized polyamide resin may have excellent heat resistance and reduced or no gel generation and yellowing phenomenon in a molding process.
摘要:
Disclosed herein is a method of preparing prepolymer particles. The method includes injecting a prepolymer in a solution state by bottom-up type injection to form prepolymer particles by removing a solvent from the prepolymer in a solution state. The method can prepare prepolymer particles, which can be used in solid-state polymerization, using a bottom-up type flash process.
摘要:
A polyamide ester resin includes: a repeat unit derived from a dicarboxylic acid; a repeat unit derived from a diamine; and a repeat unit represented by the following Formula 1, wherein the polyamide ester resin has a melting temperature (Tm) of about 280° C. or more. The polyamide ester resin can exhibit excellent properties in terms of moisture absorption resistance, heat resistance, discoloration resistance, fluidity and the like by using a cyclic ester. wherein R1 is a C3 to C12 linear, branched or cyclic alkylene group.
摘要:
A copolymerized polyamide resin includes a polymer of a monomer mixture comprising a dicarboxylic acid component and a diamine component including about 4 mol % to about 20 mol % of an alicyclic diamine represented by the Formula 1, wherein the polyamide resin has a melting temperature (Tm) from about 280 to about 330° C. and a crystallization temperature (Tc) from about 250 to about 300° C.: wherein, R1 and R2 are the same or different and are each independently a C1 to C5 alkyl group or a C6 to C10 aryl group, X is a C1 to C10 hydrocarbon group, and m and n are the same or different and are each independently an integer from 0 to 4. The copolymerized polyamide resin can exhibit excellent properties, such as crystallinity, heat resistance, processability and discoloration resistance, and an excellent balance therebetween.