CS232636B1 - Polyethylene oxide concentrates for modifying the properties of polypropylene fiber products - Google Patents

Abstract

Concentrates of polyethylene oxides for improving the absorption properties of fibers, reducing Young's modulus and increasing the effects of modifiers for surface dyeing of polypropylene fibers consist of 80 to 98 percent by mass. polypropylene with rel. moth. mass 30,000 to 200,000 and 2 to 20% polyethylene oxide with rel. mass 600 to 35,000, or from a mixture of polyethylene oxides of various rel. moth. weight.

Description

The present invention relates to polyethylene oxide concentrates for the production of polypropylene fibers, the addition of which to the fiber-forming polypropylene modifies and improves some of the useful properties of the fibers produced.

The preparation of fibers with modified properties requires the incorporation of various additives into the fiber mass. The addition of additives at the desired concentration directly to the polymer during its manufacture on large-capacity devices with relatively low mixing effect is associated with an increase in waste during cleaning of the apparatus when switching to conventional production, possibly with impaired distribution of the additive in the mass of polymer produced.

These drawbacks are solved by the invention according to which the addition of polyethylene oxides to the film- or fiber-forming polypropylene is preferably carried out by means of a polyethylene oxide concentrate according to the invention consisting of 80 to 98% by weight. polypropylene with rel. mol. by weight 30,000 to 200,000, 2 to 20 wt. of polyethylene oxide with a relative mol. wt. % 600 to 35,000, or mixtures thereof, as well as 0.05 to 5 wt. stabilizers.

The process according to the invention is characterized in that the feed of polypropylene powder and liquid or solid polyethylene powder according to rel. mol. the weight and optionally also the stabilizer are mixed in a high-speed mixer, the prepared mixture is fed to a melter, where it is melted, stirred and kneaded at a temperature of 120 to 280 ° C, optionally degassed or vacuumed and finally formed into a longitudinal formation. to granulate.

We have found that the addition of polyethylene oxides to the mass of polypropylene fibers during their melt spinning results in a modification of some of their properties which positively affects their suitability for the selected applications. The addition of polyethylene oxide to the mass of the polypropylene fiber causes disintegration of its fibrillar structure, thereby facilitating e.g. diffusion of dyes into the fiber thereby increasing the effect of the surface dye modification by Ni-compounds according to U.S. Pat. AO 185 006, or by means of an amine nitrogen modifier according to U.S. Pat. AO 219 176. The addition of polyethylene oxide improves the adsorption and absorption properties of the POP fiber by its action and thus makes it advantageous to use e.g. as a filling of cigarette filters, according to MS. AO 196 654

The addition of polyethylene oxide to the POP fiber mass further affects the Young's modulus of the ingested fibers and causes an increase in the maximum grain ratio, thereby allowing the fiber to be processed, particularly in the gravity operation.

Example 1

A homogeneous mixture of powdered polypropylene of ITT 10.7 g / 10 min is prepared by stirring for 5 minutes on a rapid mixer. with 15 percent by weight. powdered polyethylene oxide of rel. The mixture from the rapid mixer was transferred to a six-zone two-spindle kneading melter with the following temperature regime on the heating zones starting from the inlet: 240, 240, 150, 150, 220, 220 ° C. At the outlet of the apparatus, the melt is extruded into water in the form of strings, which, after cooling, are chopped on a crushed mill.

The prepared granulated polyethylene oxide concentrate was used to modify the properties of polypropylene conjugated fibers for the cigarette filter filling according to U.S. Pat. AO 196 654. Cigarette filters made from a fiber treated with 1% by weight of polyethylene oxide exhibit a markedly increased ability to catch tars from the previous cigarette smoke compared to untreated fibers.

Example 2

Under the technological conditions of Example 1, a methylene oxide concentrate of rel. mol. 20% by weight with a polyethylene oxide content of 20% by weight.

A fiber was prepared on the spinner with the addition of a polyethylene oxide concentrate to a content of 1% by weight of polyethylene oxide in the mass of the prepared fiber. When compared to fibers without the addition of polyethylene oxide, the maximum weight ratio of the undiluted fiber increased by 12 percent and the Young's modulus decreased by 14% for the fiber treated with the addition of polyethylene oxide.

At k1 and d 3

Isotactic polypropylene powder with rel. mol. with a weight of 100,000, it is mixed on a rapid mixer to a homogeneous mixture with the addition of 5% by weight of a mixture of polyethylene oxides in which the polyethylene oxides of rel. mol. weights of 600 and 30,000 are represented in a 1: 1 weight ratio. The prepared mixture is fed to a melting-kneading machine with five heating zones, where it is worked up at the following temperature regime on the heating zones starting from the inlet: 270, 240, 120, 120, 230 ° C. At the outlet of the apparatus, the melt is extruded into water in the form of strings, which, after cooling, are cut into crushed material.

Claims (1)

232638 PREDMET Polyethylene oxide concentrates pre-treated with polypropylene fiber products characterized in that they contain 80-98% by weight. polypropylene rel. mol. wt. % of from about 30,000 to about 200,000 and from about 2 to about 20 wt. polyethylene oxide rel. mol. weight of 600 to 35,000 will be assigned to any desired mixture.