摘要:
Disclosed is a process for modifying polyamide polymers by attaching a modifying group to the amide nitrogen atoms and the modified product formed. The process comprises contacting a modifier with a diamine then reacting the resulting modified diamine with diacid to form the modified polyamide.
摘要:
A multi-stage process for the manufacture of branched aliphatic polyamides is provided. The process comprises the steps, in sequence, of feeding to a reactor a slurry of at least one aliphatic dinitrile, and at least one aliphatic diamine, at least one of which is branched, in the presence of 0.05 to 2 % by weight of a phosphorous-containing compound, with the incremental addition of water, heating the slurry to a temperature of at least 270 °C while maintaining a pressure of at least 1.2 Mpa, venting water, ammonia and other volatile matter from the reactor while maintaining the temperature and pressure, maintaining the temperature for a further period of time while reducing the pressure to at least atmospheric pressure and then discharging the polyamide so formed. Polyamides made by this process are substantially the same as corresponding polyamides made by the conventional salt-strike process, and can be used in molding, coating and film applications. Examples of polyamides that can be made using this process include those formed from an admixture of adiponitrile and 2-methyl pentamethylene diamine, and from an admixture of 2-methyl glutaronitrile and hexamethylene diamine.
摘要:
Stabilized solution-dyed fiber is made by melting a polyamide which is amide monomers polymerized in the presence of at least one mono or dicarboxylic acid chain regulator and at least one hindered piperidine compound, coloring the melted polyamide, and spinning the colored polyamide into fibers that have about 40 % or better retained tenacity after 2125 kJ exposure to xenon arc radiation as per AATCC Test Method 16-1993, 'Colorfastness to Light', Option E. Copper stabilizers are unnecessary.
摘要:
The invention concerns a method for extracting by electrodialysis a compound comprising at least amine functions capable of protonation from a liquid medium. More particularly it concerns a method for extracting, and separating at least the monomers comprising amine functions capable of protonation from a liquid medium derived from the hydrolysis of polyamides. The method of extraction from a liquid medium consists in subjecting to protonation the amine function(s) of the compounds to be extracted by adjusting the pH of the medium and in separating the compounds by passing them through a cationic membrane under the effect of an electric current. The invention is particularly applicable in processes for the chemical stabilisation of polyamides such as the PA 66, PA 6.
摘要:
A linear polyamide having a weight average molecular weight above 200,000 is made by heating a lower molecular weight molten polyamide with thorough mixing at a temperature of about 265-300 °C for at least 5 minutes while an inert gas is swept gently through the reactor, the increase of molecular weight of the polyamide being catalyzed by a particular phosphinic acid derivative.
摘要:
The present invention relates to an apparatus for processing materials, a process for mixing, finishing and de-volatizing polyamide to make 66 nylon and the 66 nylon made by this process. The apparatus comprises an agitator section (12) having an outlet (14) adjacent the bottom thereof; a transfer screw (20) disposed adjacent the outlet of the agitator section; a spiral ribbon (24) extending upwardly from the transfer screw; a ring (26) disposed vertically above the spiral ribbon, at least one baffle (32a, 32b) disposed vertically above the spiral ribbon and connected to the ring and a wall-wiping spur connected to the ring. Preferably, the apparatus has two baffles - an upper one (32a) for pumping the material downwardly and a lower one (32b) for pumping the material upwardly. The diameter of each baffle is preferably about 80 % of the diameter of the agitator section.
摘要:
Die Erfindung betrifft witterungsstabile Polyamide und Verfahren zu deren Herstellung, wobei die Polymerisation bzw. Polykondensation der polyamidbildenden Komponenten (I) in Gegenwart von 0,02-0,7 Gew.-% 4-Amino-2,2,6,6-tetraalkylpiperidin (II), 0-0,5 Gew.-% eines aliphatischen oder cycloaliphatischen Diamins (III), welches eine primäre und eine tertiäre Aminogruppe trägt, und 0,02-0,7 Gew.-% eines in 4-Stellung zur OH-Gruppe funktionalisierten 2,6-Dialkyl-phenols (IV) der Formel worin R 1 und R 2 gleiche oder verschiedene Alkylreste mit 1 bis 6 C-Atomen sind, R 3 entweder ein Wasserstoffatom oder eine Methylgruppe ist, die funktionelle Gruppe A entweder eine freie Carboxylgruppe oder eine mit C 1 -C 4 -Alkoholen veresterte Carboxylgruppe oder eine primäre Aminogruppe darstellt, für x und y im Fall der Aminogruppe die Wertekombinationen (x = 2 / y = 1); (x = 2 / y = 0); (x = 1 / y = 0) und (x = 0 / y = 1) möglich sind und im Fall der freien oder veresterten Carboxylgruppe x und y zusätzlich jeweils 0 sein können, durchgeführt wird, und wobei sich die Mengen der Komponenten I bis IV zu 100 Gew.-% ergänzen, die Summe der Komponenten II, III und IV 0,05-1,3 Gew.-% beträgt und die Komponenten II, III und IV über Amidbindungen an die Polymerketten gebunden sind. Die Erfindung betrifft weiterhin witterungsstabile aus Lactamen, ω-Aminocarbonsäuren zugängliche Polyamide aus den vorgenannten Komponenten I, II, III, gegebenenfalls IV und 0,1 bis 1,2 Gew.-% einer Tri-, Tetra- oder Polycarbonsäure V sowie ein Verfahren zu deren Herstellung, wobei sich die Mengen der Komponenten I bis V zu 100 Gew.-% ergänzen, die Summe der Komponenten II, III, IV und V 0,2 bis 2,5 Gew.-% beträgt und die Komponenten II, III, IV und V über Amidbindungen an die Polymerketten gebunden sind.
摘要:
The invention relates to a process for one-stage subsequent condensation of polycondensates, in particular of polyamide 6.6 granules in a fluidised bed reactor (1). During said process, a partial stream of a carrier gas, where nitrogen (N2) is used as the carrier gas, is removed at a temperature of 20-230 °C from the main stream and is conveyed in such a manner through a gas washing column (15) charged with water that the partial stream of conditioned carrier gas is returned with a point of condensation of 10-80 °C (100 % of relative humidity) into the main stream of the carrier gas. During the cooling phase of the granules, return of the partial stream of carrier gas is stopped. After cooling, the granules are removed and used directly in other applications. Said process achieves the designated viscosity and also a precisely defined level of humidity in the polymer, which level is important for further processing.