CS231794B1 - Antistatically modified polyamides, mainly fibers - Google Patents

Abstract

Antistatic polyamide, especially the fibers consist of 90 to 99.5% by weight. of polyamide (A), from 0.5 to 10% wt. substance (B), containing polyether, polyester and/or polyamide groups, prepared from C4 to C12 dicarboxylic acid (I), alpha, omega-dihydroxypolyalkylene oxide (II) by mol. weight of 300 to 7000 with a molar ratio (I) to (II) of 1 to 0.6 to 0.6 to 1 and from 6-caprolactam (III) in an amount of 20 to 80% by mass. calculated by weight (B).

Description

231794

The invention relates to antistatically modified polyamides, in particular fibers containing 0.5 to 10% by weight. of an antistatic modifier based on the polycondensation product of 6-caprolactam with the product of esterification of C 4 and 12 aliphatic dicarboxylic acid and α, ω-dihydroxyipolyalkyl oxide of molecular weight of 300 to 7000.

Polyamide-based polymeric materials exhibit relatively easy electrostatic charge formation. The rate of electrostatic charge leakage is dependent on the electrical conductivity of the material. Some low electrical conductivity of the polyamides is explained by the transfer to the amide bond of another polymer chain, which is enabled by the rotation of the H-O-C bond. It will be appreciated that the electrical conductivity, respectively. the rate of escape of the electrostatic charge is proportional to the concentration of the amidic bonds in the polymer chain. It depends on the type of starting monomer and the sold condition is constant.

Polyamide 6, i.e. a 6-capro-lactam-based polymer, is one of the most common type of polyamides processed into various products, mainly fibers. Polyamide fibers are characterized by some negative properties and enhanced electrostatic charge formation as compared to natural fiber materials such as cotton or cotton. Due to the above-mentioned dependencies of the electrical conductivity of the polyamide on its chemical structure, it can be removed or removed. to suppress the formation of electrostatic charge and the resulting pleasantness manifested in the process area as well as in the properties of the product by suitable chemical modification.

Antistatic treatments of polyamides, mainly fibers, are currently of increasing interest. This is manifested by the large number of claimed inventions suggesting removal procedures, possibly suppressing electrostatic manifestations. Most interesting are those modifications that tend to reduce or decrease. suppressing the formation of electrostatic charge. Types of suitable modifiers are characterized in that at least one of the following conditions: - are capable of dissociating into ions - containing hydrophilic groups - containing hetaroatoms. Most modifiers contain alkoxy groups in their chain. The efficacy of modifiers is often enhanced by further treatment, e.g. phosphating, i.e. by the formation of phosphoric ester (a. No. 226 630).

The object of the present invention is to provide antistatic modified polyamides, in particular fibers comprising 0.5 to 10% by weight of polyamide. an antistatic modifier for the polyamide density. The difficulty is a substance containing polyether, polyester and / or polyamide groups which can be prepared from C 1 to C 11 di-carboxylic acid (I) and,, ω-dihydroxy-polyalkylene oxide (II) with a molar mass of 300 to 7000 in a molar ratio of (I to (II) of 1 to 0.6 to 0.6 to 1 to 6-caprolactam (III) in an amount of 20 to 80% by weight based on the product of reaction (I) and (II).

The high molecular weight modifier can be added to polyamides at any technological node with respect to its good thermal stability. It can be added directly to the polymerization additive in the form of an esterification product. In addition, the modifier can be added in the expanded state to the polyamide melt just prior to further processing such as granulation, spinning, casting, and the like.

It is also possible to prepare a modified polyamide granulate with a higher content of difficulty, which is diluted with pure polyamide granules to the desired concentration before processing. Přikladl

A melt of a high molecular weight modifier prepared by polycondensation of 6 - caprollate in an amount of 20% by weight was added to the melt of polyamide 6 by means of a side worm dosing device. for example, the esterification of α, ω-dihydroxypolyethylene oxide with a molar mass of 600 and C 6 di-carboxylic acid in a molar ratio of 0.7 to 1, so that the final concentration of the difactor is 1% by weight. At the same time, a fiber of reference densities of 110 dtex was prepared, but without the addition of a modifier. The fibers were processed by circular et al. These were subjected to a 20x wash cycle for washing synthetic fibers in a TATRA-MAT automatic washer with the addition of R-diorn detergent at a concentration of 3 g / L of solution. In the dried and air-conditioned samples, the electrostatic properties were measured on an EP 02 friction electric apparatus at 20 ± 2 ° C and 40% relative humidity. The measured values are shown in Table 1. 2 3 1 7 9 4 S 6 TABLE 1

Evaluation of electrostatic properties of PAD-6 txh of 110 dtex

Reference Fibers Modified Fibers

Electrostatic Charge Intensity After 70 Charging (kV / cm)

Electrostatic Intensity after 120 Waste (kV / cm) Example 2 PAD Granulate containing 5% w / w. of a polycondensation modifier of δ-caprolactam in an amount of 75 wt. the product of esterification of 1 mole of C 6 dicarboxylic acid with 0.9 mole of α, ω-dihydroxy-18,5 4,2 17,0 2,9 polyethylene oxide with a molar mass of 6000bp spun. The prepared fiber of 67 dtex as well as the reference fiber of the same fineness was processed and evaluated as in Example 1. The measured values are shown in Table 2. TABLE 2

Evaluation of anti-electrostatic properties of PAD-6 txh fineness 67 dtex

Reference Fibers Modified Fibers

Electrostatic Charge Intensity After 70 Charging (kV / cm)

Intensity of electrostatic charge after 120 waste (kV / cm 3 Example 3 PAD granulate containing 8% by weight of a multiplier prepared by polycondensation of 6-caprolactam in an amount of 50% with an esterification of 1 mole of C-12 dicarboxylic acid with 1 mole of α, ω -dihydroxypolyethy- 18.3 4.21 16.1 0.46 phenoxide with a molecular weight of 3000 filaments Modified filament as well as a 110 dtex reference sample was processed into a standard and evaluated in Example 1. Table 3. TABLE 3

Evaluation of electrostatic properties of PAD-6 txh of 110 dtex

Reference Fibers Modified Fibers

Electrostatic Charge Intensity After 70 Charging (kV / cm)

Electrostatic Intensity After 120 Waste (kV / cm) Example 4 PAD Granulate containing 5 wt. of a polycondensation agent of 6-caprolactam in an amount of 60% by weight. esterification product 0.8 mol C 6 dicarboxylic acid and 1 mole α, ω-dihydroxy-21.7 2.90 18.2 0.51 polyethylene oxide with a molar mass of 300bol spun. The prepared fiber modified as well as the reference 2670dtex fineness was processed and evaluated as in Example 1. The measured values are shown in Table 4. 2.30 0.31 TABLE 4

Reference Fibers Modified Fibers

Electrostatic charge intensity after 70 s charging (kV / cm) 14.2

Electrostatic charge intensity after 120 s decay (kV / cm) 13.6

Claims (1)

SUBJECT An antistatic modified polyamide mainly in the form of fibers, characterized in that it consists of 90 to 99.5 wt. % polyamide, from 0.5 to 10 wt. substances containing polyether, polyester and / or polyamide groups, obtainable by esterification of C4 to C12 dicarboxylic acid (IJ, α, ω-dihydroVYNALEZ) xypolyalkylene oxide having a molecular weight of 300 to 7000 (II) with a molar ratio (Ij to (II) of 1 to 0) 6 to 0.6 to 1, followed by polycondensation of the esterification product and 6-caprolactam (III) used in an amount of 20 to 80% by weight based on the weight of the product of reactions I and II.