CS215442B1 - A method of preparing permanently antistatically modified polyamide fibers - Google Patents

Abstract

A method for preparing permanently antistatically modified polyamide fibers simplified by using liquid concentrates of antistatic modifiers, which are polycondensation products; mixtures of diaminopolyethylene glycol, dicarboxylic acids with 4 to 12 carbon atoms or their esters and other components, such as caprolactam or aminocaproic acid, stabilizers, etc., agents causing branching of molecules. A film of a liquid dispersion containing 3 to 20% by weight of a polyetheramide modifier and containing 3 to 20% water is applied to the surface of the fiber, in an amount corresponding to 0.5 to 3% by weight of the polyetheramide itself per fiber weight. The fiber, after preparation and drying, is heat-treated by heating to 80 to 130 °C.

Description

An object of the present invention is to provide a method of preparation. permanently modified antistatic polyamide fibers.

Antistatic treatment of synthetic fibers the purpose of improving the physiological properties of textile;

products. The reduction of electrostatic charge and fibers is achieved by using substances capable of dissipating this charge by increasing the electrical conductivity of the fibers. These are usually substances containing polar functional groups. Very often polyalkylene glycols which have been treated are used as antistatic modifiers or as modifier components. These include polyetheramides which have good antistatic activity and good scrub resistance. Their disadvantage! are quite complex and technically demanding procedures for their application.

The modification is generally carried out by incorporating the modifying agent into the polymer mass or applying it to the surface of the articles. The first procedure, i.e. j. incorporating the modifier into the polymer mass has the advantage of providing a longer durability of the modifying effect. However, this is largely dependent on the properties of the modifying agent. The disadvantage of this process is the greater need for a modifier and the relatively complex process for preparing the modified polymer.

i Second procedure, i. j. applying the modifier to; the surface of the fibers is relatively simple in terms of embodiment. However, it is not as durable as in the previous procedure. For its simplicity, it is often used with a single stew to provide the antistatic properties of textile products for a short period of time, often only between washings.

* Currently, efforts to improve the properties of polymers, respectively. polymeric products, including antistatic and broader physiological properties through various modification procedures. In doing so, they intend to increase the 'efficiency' and durability of the modification, to ensure simultaneous improvement of more ^! technical properties, to technically simplify and complicate the modification procedures. Despite some achievements of this effort, its results are still very limited. The question of ensuring the lasting effectiveness of synthetic fiber surface modifications, including anti; static modification by applying modifiers to the fiber surface. Attempts to anchor them permanently

in the surface of the fiber without decreasing the efficiency to date, they have also produced a limited effect. ¹

However, it has been shown that the combination of surface modification with the advantages of several modifying principles leads to a desirable technically and economically advantageous simple process of effective and relatively durable antistatic modification; polyaionide fibers.

[A preferred method of both permanently modified and antistatic polyamide fibers has been shown to be. the process of the present invention utilizing;

polyetheramide modifiers that are polycon- [; denzation products of diaminopolyethylene- { ¹ ! 215442 | glycol with relative weight of 600 to 2000, dicarboxylic acids having 4-12 carbon atoms, or esters thereof in an amount of 1 - 1.2 equivalents per diaminopolyethylene glycol used and addition of other components such as ε-caprolactam or ε-aminocaproic acid, stabilizers, agents causing branching of molecules and i. in an amount such that the diaminopolyethylene glycol content of the polyetheramide; a fraction of 50-80% by weight, characterized in that a liquid film is applied to the fiber surface; dispersions containing 3-20 wt. % polyetheramide modifier and 80-97 wt. water in an amount corresponding to 0.5-3% of the polyether ether itself by weight of the fibers and in that the fibers, even after drying, are heat treated by heating to _;

Mp 80-130 ° C.

The proposed procedure includes a plurality of mutual principles that may not be effective by themselves or in conjunction with other procedures.

Simple and technically easy to implement {procedure ensures that the modifier is applied to the surface.

! fibers which can be secured during the spinning process. The fabric softener is applied in a manner analogous to that of the fabric softener application without excluding the possibility of co-application. 'J

Such a procedure is possible only with dissolved; or dispersed modifier. The durability of the modifying effect is mainly related to the resistance to scuffing. It is therefore in contrast to. as well as the ability of the modifier to pass the solvent deposition into a liquid form. In the proposed procedure, the requirement of stability of action and therefore! wash resistance takes into account in several. First of all, polyetheramides are mentioned as the basis of the liquid modifier. These, on the one hand, do not produce true solutions, except for a small area, of the relative proportion of their starting components with the solvents used. chains of amidic nature: in the block copolymer of polyetheramide, it is the cause of its affinity for polyamide and thus of its increased compatibility and resistance to scrubbing. The main requirement - high antistatic efficiency is given as one of the basic material properties of the polyether amides used as modifiers. _F

Príklaá í! The fibers of the polyamide during the spinning are passed through a liquid film dispersion roll with a content of 10% by weight in the space between the die and the winding device. polyether amide. The fibers after winding and air-conditioning were decanted and fixed at 120 ° C for 20 minutes. The electrostatic charge of the fibers after washing corresponded to 32% of the untreated fibers. After 10 washes the charge value.

| increased to 48%.

The described experiment was combined. 4 $ certain technological problems - higher breakdown in fiber splicing.

EXAMPLE 2 The method was identical to that of Example 1 (except that a 10% by weight dispersion of a polyetheramide modifier in a 10% fabric softener solution was applied to the fibers. The technological problems observed in the previous example were eliminated in the second embodiment.

EXAMPLE 3 The procedure J was identical to Example 2 with the difference Yom that the fixing takes place under 130 ^L C I prie- in the course of half an hour.

j The charge value increased to 36% compared to the previous procedures after the first wash and, on the other hand, after 10 washes, it decreased to 43% of the charge value of the crosslinked fibers.

Example 4 Polyamide-6,6 fibers were immersed in a dispersion of 10% polyetheramide in water. Slight centrifugation removed the excess dispersion to a residual (1.7% polyetheramide content on modified fibers). After drying and tempering for half an hour

130 ° C was the electrostatic charge voltage at 28% of the original value.

Claims (1)

! 4 $ certain technological problems - higher fidelity when cutting fibers. Example 2 The process was identical to Example 1 with the exception that 10% w / w dispersion of polyether amide modifier in 10% fabric softener solution was applied to the fibers. The technological problems observed in the previous example were eliminated in the second embodiment. Example 3 j The procedure was identical to Example 2 except that the fixation was carried out at 130 PC in the course of half an hour. j The charge value increased by 36% compared to the previous stages after the first wash and, on the contrary, by 10% it decreased to 43% of the value of the charged fibers charge. EXAMPLE 4 Polyamide-6.6 fibers were immersed in a 10% polyether amide dispersion in water. The weak centrifugation removed the excess dispersion to a residual content of 1.7% polyether amide on the modified fiber. After drying and half an hour tempering at 215442 130 ° C, the voltage value was electrostatic and 28% of the mean value. SUBJECT MATTER J! A method for preparing permanently antistatic modified antistatic polyamide fibers using polyether amide modifiers which are | polycondensation products of diamine; Polyethylene glycol rel. mol. mass ;; 600-2000, dicarboxylic acids containing 4-12 carbon atoms or esters thereof in an amount; 1 - 1.2 equivalents to the diamino-polyethylene glycol used and the addition of other components such as ε-caprolactam or ε-aminocaproic acid, stabilizers, branching agents and even in such a way that the content of diaminopolyethylene glycol in the polyetheramide 50-80 wt. characterized in that a liquid dispersion film containing 3-20% wt. % polyether amide modifier and 80-97% 1 wt. water, in an amount corresponding to; 0.5-3% of polyetheramide alone on the weight of the fibers and in that the fibers are thermally dried; by heating to 80-130 ° C.