CS242256B1 - Antistatically modified polypropylene - Google Patents

Abstract

Antistatically modified polypropylene in the form of fibers, strings, films and moldings, which consists of 95 to 97.5 wt. % isotactic polypropylene and 2.5 to 5 wt. % of a polyetheresteramide type modifier, which can be prepared by esterification of polyethylene glycol and dicarboxylic acid in the presence of esterification catalysts, where a polyetherester product is formed, which in the presence of water and 6-caprolactam further reacts to form a polyetheresteramide, where the content of the amide component can range from 20 to 60 wt. %.

Description

The invention relates to a modified polypropylene (POP) nap with antistatic treatment, mainly fibers, strings, films and extrusions containing a polyetheresteramide type modifier.

Polypropylene-based polymer materials, like most synthetic materials, are characterized by the formation of an electrostatic charge. This charge affects the surroundings until it disappears. The rate of decay of the electrostatic charge depends on the electrical conductivity of the material.

In polypropylene, as well as in other synthetic materials, but mainly fibers, the negative influence of electrostatic charge is manifested in the field of packaging, but also in the field of practical life. These negative influences can be suppressed or eliminated by appropriate modification, namely by antistatic treatments.

From a practical point of view, permanent, i.e. permanent antistatic treatments are required. The proposed solution ensures the requirement for permanence, which is in line with the global trend.

The above problem from a technical point of view is solved in the world in several ways, namely by applying compounds of amine and amide derivatives of fatty acids, some esters, higher fatty alcohols and their polymer derivatives and esters. Furthermore, there are metal oxides, organic salts, benzenesulfonates, phenylsulfonates and others.

The polyesteramide modifier is added to the basic polypropylene polymer before its actual processing in extruders, in granulated form, and then in melt form by injection.

Furthermore, it is possible to prepare a concentrate of the modifier with the base polymer, which is diluted with pure polypropylene granulate to the desired concentration before processing.

The modifier is prepared in granular form by a two-step reaction.

In the first stage, the polyether ester product (III) is formed by the reaction of polyethylene glycol (I), dicarboxylic acid (II) and catalyst (IV).

In the second stage, the polyester product (III) reacts in the presence of water (V) with 6-caprooctane (VI) and polyetheresteramide (VII) is formed.

The content of the polyamide component in the modifier is adjustable from 20 to BO % by weight. The modifier is prepared in granulated form and can be adjusted for further use. 2.5 to 5 % by weight of the modifier is used, based on Czechoslovak copyright certificate No. 237 45.4 and its other applications are protected by Czechoslovak copyright certificate No. 231 794.

Example 1

To the melt of isotactic polypropylene Tatren TE-430 was added by a side screw dosing device a melt of a modifier prepared by polycondensation of 6-caprolactam in an amount of 20 wt. % with a polyester product, which is formed by the reaction of polyethylene glycol with a molar mass of 16010 and succinic acid in a molar ratio of 0.7 to 1 so that the resulting concentration in the fiber was 2.5 wt. %. At the same time, a reference fiber with a fineness of 110 dtex without modifier was prepared. Both fibers, each separately, were processed into etaloms and evaluated mainly for antistatic treatment and its durability by washing in an automatic Tatramat washing machine using 3 g/l Radion washing powder in 20 washing cycles.

The electrostatic properties of the dried and conditioned samples were measured on a friction electrification device EP-0.2 at a temperature of 20 + 2 °C and a relative humidity of 40%. The measured values are given in Table 1.

Table 1

Value, not electrostatic properties POP txh fineness 1T0 dtex

Reference sample ^L Modified fiber

Charge intensity after 294 s

charging (kV.cm) —5.6 -2.4 Charge intensity after 300 s discharge (kV.cm) —5.3 -0.7 Charge drop after 300 seconds discharge (%) 5.53 70.8

Example 2

To the melt of isotactic propylene of Tatren TE-451 quality was added (as in case 1) a melt of the modifier prepared by polycondensation of 6-caprolactam in an amount of 40 wt. % with a polyester pyroduct, which is formed from adipic acid and polyethylene glycol of molar mass 6Ό0 in a ratio of 0.8 to 1 so that the resulting concentration in the fiber was 3.5 wt. %/o. The prepared modified and reference fiber, with a fineness of 3,860 dtex, was processed and evaluated as in example 1.

The measured values are given in Table 2.

Table 2

Evaluation of electrostatic properties of POPib with a fineness of 3,860 dtex.

Reference sample

Modified fiber

Charge intensity after 294 s of charging (kV. cm)

Charge intensity after 300 s of discharge (kV.cmj Charge drop after 300 s of discharge (%)

Example 3

To the melt of isotactic polypropylene of Tatren 4)11 quality was added, as in Example 1j, a melt of a modifier prepared by polycondensation of 6-caprolactam in an amount of 75 wt. % with a polyester product formed from seibacic acid and polyethylene glycol of molar mass -9.6

-2.7 —0.5

81.48

000 in a ratio of 1 to 1 so that the resulting concentration in the fiber was 5 wt. %. The prepared modified and reference fiber with a fineness of 2.82 dtex (staple) was processed and evaluated as in Example 1. The measured values are given in Table 3.

Table 3

Evaluation of electrostatic properties of POPs with a fineness of 2.82 dtex

Reference Thread Modified Thread'

Charge intensity after 294 s charging (kV.cmj —6.2 Charge intensity after 300 s of discharge (ikV.cmj -5.5 Charge drop after 300 s of discharge (%) 11.2

From the above examples it is clear that the polycondensate of 6-caprolactam with the esterification product of dicarboxylic acid and polyethylene glycol of given molar masses in the concentrations used will give

-2.0 —0.3 85.0 as an effective antielectrostatic modifier when applied to polypropylene mass. The prepared polypropylene fibers have excellent and permanent antielectrostatic properties.

Claims (3)

2422SB Table 2 Evaluation of electrostatic properties POPib fineness 3 860 dtex. Reference Sample Modified Fiber Charge Rate After 294 Snabs (kV cm) Charge Strength After 300 Swellings (kV.cmj Charge Decrease after 300 Swellings (%) Example 3 A (modifier melt was added (as in the present invention) to the Tatren 411 isotactic polypropylene melt. prepared by polycondensation of O-caprolactam in an amount of 75 wt.% with a polyester product formed from seibacic acid and polyethylene glycol molar mass ,69.6 -2.7 - 0.5 81.48 3000 in a ratio of 1 to 1 such that the final concentration in the fiber is 5 wt. %. The prepared modified and reference filaments of 2.82 dtex (staple) were processed and evaluated as in Example 1. The measured values are shown in the table. 3. Table 3 Evaluation of Electrostatic Properties of POPs Fineness 2.82 dtex Reference Fiber Modified Fiber 'Charge Intensity of 294 s Charging (kV.cmj —0.2 Charge Amount after 300 Swinging (kV.cmj -5,5 Decrease of Charge After 300 Swinging (%) 11.2 It will be appreciated from the above examples that polycondensate 6-caprolactam with the esterification of the dicarboxylic acid and the polyethylene glycol of the molar masses used in the concentrations used will be as low as -2.0-0.385.0 as the effective anti-electrostatic modifier in the application. The prepared polypropylene fibers have excellent and permanent anti-electrostatic properties. ARTICLE Antistatically modified polypropylene in the fiber, shear, foil and molding composition characterized in that it comprises 9-57.5% by weight of isotactic polypropylene. % polypropylene of from 2.5 to 5% by weight of a polyetheresteramide type modifier prepared by esterification of polyethylene glycol and dicarbo xylic acid under the presence of esterification catalysts, where a polyether ester product is formed which, in the presence of water and 6-caprolactam, is formed to produce a polyetheresteramide wherein the amide content can range from 20 to 60 wt. ° / o.