CS237179B1 - Raw material for the production of sleeves - Google Patents

Abstract

The invention provides for the use of polyamide 6 obtained by melting fiber or textile polycaprolactam wastes, which have a viscosity number in the range from 100 to 400 cm3/g and a content of hydrophilic substances extractable with water in the range from 0.1 to 3.0 wt. %. Such polyamide 6 is advantageously used as a raw material for the production of sleeper inserts serving as a sleeve for a screw by which the rail is attached to a concrete sleeper. The invention uses the newly discovered property that hydrophilic additives increase the cohesive forces between concrete and a sleeper insert made of this polyamide 6. Such polyamide 6 can also be used in a mixture with plastic granulate obtained by polymerization of caprolactam, optionally with the addition of reinforcing fillers and/or plastic additives.

Description

1

237 17S

The present invention provides the use of polyamide 6 obtained from fiber or textile polycaprolase waste.

In the production of polyamide fibers and textiles, industrial waste is produced, which is mostly used by depolymerization. The polymerization is energy intensive and produces 25% by weight of monomer. From the monomer obtained, a plastic polycaprolactam granulate is produced by the polymerization, which is also used as a raw material for the manufacture of sleeves. The variable portion of such industrial waste is not so much use - especially because it contains fiber and textile additives that adversely affect the progress of depolymerization and / or the quality of the monomer.

More recently, the fiber and textile polycaprolactam wastes can be processed by melting in special devices - for example, plastic components - to polyamide 6. However, the polyamide 6 obtained does not have a uniform coloring and comprises fiber and textile additives. Therefore, it cannot be utilized for the production of conventional plastics products,

It has now been found that polyamide 6, obtained by melting fiber or textile wastes, can be advantageously utilized for the production of sleeve inserts serving as a screw for fastening the wicker to the concrete tray.

The sleeve inserts have so far been produced by injecting melt-hydrophobic plastic granulates produced by the polymerization of monomers. In order to improve performance, reinforcing filler and plastic additives are usually added to the 2 237 179 zeros. »The inserts are inserted into the sleeper mold and poured with concrete which solidifies over time» Touch interaction between the concrete and the surface of the sleeve is of great importance for functional ability. , from which the size of the cohesive forces depends and hence the safety of the attachment of the rails to the concrete substructure »

The invention is based on the newly discovered properties of polyamide 6 obtained by fibrous or textile wastes, that the bonding forces between the concrete and the surface of the sleeves made of such a polyamide 6 are higher than between the concrete and the surface of the sleeve made of plastic. polycaprolactam granulate · Improved adhesion is made possible by the hydrophilic fiber and textile additives - such as spinning preparations, matting agents, pigments, dyes, anti-ultraviolet stabilizers, antistatic agents - reducing the hydrophobicity of polycaprolactam and thereby beneficially affecting the concrete-to-touch interaction. As a result of this, the safety of fixing the rail to the concrete at the bottom increases. As a result of the increased safety, a blend of such a polyamide 6 and a plastic polycaprolactam granulate obtained by the polymerization is used to manufacture the sleeves. caprolactam, and if it adds filler or plastic additives »

In order to ensure the mechanical properties of the inserts, fiber or textile polycaprolactam wastes using the invention, they must have a viscosity number, determined according to ČSN 64 0336, in the range of 100 to 400 cm @ 2 / g, and the content of hydrophilic substances which can be extracted with water according to ČSN 64 3610, in the range from 0.1 to 3.0 wt. In order to prevent the cold flow of the inserts, a reinforcing filler, e.g., glass fiber, may be added by extrusion prior to injection to the polyamide 6. In order to improve the injection-molding properties of the polyamide 6, it is possible to add particulate matter prior to extrusion injection. To achieve the desired coloring of the inserts, the pigments may be added to the polyamide 6 by extrusion · 3 237 179

The use of fiber or textile polycaprolactameasts according to the invention makes the manufacture of sleeves more economical.

The waste of the waste consumes less energy than would require depolymerization to monomer and curing polymerization to the plastic granulate so that the polyamide 6 thus obtained is a raw material with less energy content. Since the loss of mass does not occur, the invention allows for a higher utilization of wastes than is achieved by their treatment with depolymerization. In addition, the invention also makes it possible to utilize the Sasi? fibrous and textile wastes for which there has been no utilization so far. The advantage of using the polyamide 6 according to the invention is therefore the full utilization of fiber and textile wastes as a raw material for the production of sleeper inserts, while at the same time utilizing its hydrophilic properties to increase adhesion to the concrete.

The textile polycaprolactam waste having a scissor shape having a viscosity number of 162 cm / g and containing 0.5 wt. % of hydrophilic substances, water-extractable, in polystyrene 6 on the plastic component. Test specimens sprayed out of polyamide 6 have the following mechanical properties in the dry state:

Tensile strength 43 MPa Ductility 67%

Hardness 163 MPa 2

Notch toughness 2 kj / m

To 70 parts by weight of this polyamide 6, 50 parts by weight of glass fibers, 15 microns in diameter, cut into 10 mm particles are added by extrusion. % of hydrophilic water-extractable streams · Test specimens, sprayed with reinforced polyamide 6, have the following mechanical properties in the dry state: 4

Tensile strength Rye Hardness

Notch toughness 237 179 120 MPa10% 256 MPa5 kJ / m2

The reinforced polyamide 6 is injected on a conventional injection molding machine under conventional processing conditions to reinforced polycaprolactam. Sleeper liners are obtained whose all utility properties meet the prescribed requirements. The cohesive force of the interbetone and the surface of these inserts is greater than that of the inserts produced by the same procedure from the plastic granulate obtained by the polymerization of caprolactam.

Claims (1)

5 OF THE INVENTION The use of polyamide 6 obtained by melting fiber and / or textile polycaprolactal wastes with a viscosity number ranging from 100 to 400 cm / g and a hydrophilic, water-extractable drug content of 0.1 to 5% by weight. 0 wt. % or a mixed polyamide 6 with a plastic granule obtained by polymerization of caprolactam, optionally with the addition of filler and / or plastic additives, as raw materials for the manufacture of sleeves