DE1770988B1 - Covering for textile fiber stretching rollers or belts - Google Patents

Description

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The invention relates to coverings for textile fibers ethylene glycol monolaurate to the stretching surface Drafting rollers or belts that give the coating antistatic properties in modern times. Drafting, roving and spinning machines use clays such as kaolin, zinc oxide, pigments, Vulkanisawerden, Retarders such as salicylic acid can be used

In the younger years the trend was to become 5.

Replacing coverings and belts with plastics, in particular a sulfur-containing vulcanizing agent system, oil-resistant synthetic rubbers. is used to harden the rubber. Systems additionally contain accelerators, such as diweise with regard to lap formation, and benzothiazyl disulfide, N-nitrosodiphenylamine, 2-benz accumulation of static electricity compared to iq thiazylsulfenamide and the like. Resins such as stretching elements are often used of leather. Numerous coumarone-indene resins have been added as tackifiers. Topping mixtures of oil-resistant synthetic In short, the coating composition can be a common rubber, especially those that are butadiene-acrylonitrile rubber compounds with the accumulation of static electricity on the toluenesulfonamide as an additional component. Eliminated all stretching elements. The static charge 15 constituents are caused in the rubber in a usual way on these elements to accumulate, e.g. B. by fulling or intensive mixing, and the adherence of fibers on these elements, mixed in, whereupon the extrusion of the covering, which is the main cause of lap formation. Wrap follows. The coverings are then vulcanized and on formation means the adherence of fibers to which the desired size is sanded.
Covering, whereby gradually more and more fibers accumulate in certain places. surface of the covering prevents elastic

The use of new fibers, especially synthetic fibers with a smooth surface, such as

stretchable synthetic fibers with a smooth surface, has polyamides and polyesters. The toluenesulfonamide

creates new problems. Such fibers adhere firmly to the film that is deposited on the surface of the vulcanizate.

a coating surface that blooms even in the absence of 25 makes the stretching surface of the coating

static electricity. completely non-adhesive for these fibers. try

Thus, there is a need for a coating composition that coatings according to the invention have shown

for textile fiber drafting systems that have the option of working for twelve months with reduced lap formation

such adhesion of synthetic fibers, in particular and otherwise better treatment of the threads

special polyamide and polyester fibers eliminated. 30 than the butadiene containing no toluenesulfonamide

The invention relates to a covering or coating for acrylonitrile rubber coverings.

Filler textile fiber draw rollers or belts The amount of toluenesulfonamide to use

containing butadiene vulcanized with sulfur is preferably 15 parts by weight per 100 parts

Acrylonitrile copolymers. The vulcanizates remove some of the rubber.

hold 5 to 35 parts by weight of o- and / or p-toluene- 35 Examples are two embodiments of the

sulfonamide, based on 100 parts by weight of the mixed invention.
Polymer.

The toluenesulfonamide produces a bloom on example
the surface of the cover or covering and eliminated

thereby the adhesive properties, which were usually 40 two masses of the following composition

the surface of oil-resistant synthetic in a rubber processing plant for manufacture

Rubber coating masses encountered by stretching rollers prepared by stretching roller coverings,
even where there is no static charge in the

Game is. A. Ingredients parts by weight

The drawing shows a typical textile fiber tension roller 45 butadiene-acrylonitrile copolymer 100

with a core formed by a metal roller 1 (32 to 34 percent by weight

and a cover 2 made of synthetic rubber with acrylonitrile)

a surface 3. This coating 2 is bone glue 50 according to the invention

formed according to as described below. Salicylic acid 1

Zinc oxide 5 to be used in connection with the invention

The butadiene-acrylonitrile copolymer contains carbon black 3

usually 25 to 40 percent by weight of acrylonitrile in titanium dioxide 15

Mixed polymer. The toluenesulfonamide is far- 10 sulfur

going incompatible with the rubber, so that it is N-CyclohexyI-2-benzthiazylsulfenamide 0.75

blooms on the surface of the cover. Under »From 55 polyethylene glycol monolaurate 3

bloom «is the diffusion of sulfonamides to dibutoxyethoxyethylformate poly-

To understand the surface of the covering that is sufficiently ethereal 15

should go slowly so that it is during the toluenesulfonamide 15

Lifespan of the covering remains effective. on the other hand

it must diffuse fast enough to surface 60 The second is as follows:

to influence the drafting rollers.

The mixed polymer with other common components is B. parts by weight

Mixed additives for coating compounds. In particular butadiene-acrylonitrile copolymer 100

Special carbon black is provided as a reinforcement filler. (38 percent by weight acrylonitrile)

Plasticizers such as polyethylene glycol or dibutoxy g ₅ sulfur 10

ethoxyethylformate polyether, can be added carbon black 0.3

are used together with such common additives as castor oil with sulfur 10

Glue, detergents and wetting agents such as polyethylene glycol 1.5

Claims (1)

3 4 Silica 30 Kaolin 20 claim: Zinc oxide 5 covering for textile fiber stretching rollers or belts Dibenzthiazyl disulfide 2 from fillers containing, with sulfur volcanic N-nitrosodiphenylamine 2 5 based butadiene-acrylonitrile copolymers, Brown pigment 2, characterized in that the Titanium dioxide 15 vulcanizates 5 to 35 parts by weight o- and / or Liquid coumarone-indene resin 10 p-toluenesulfonamide, based on 100% by weight Toluenesulfonamide contains 15 parts of the copolymer. 1 sheet of drawings COPY