DE1939269A1 - Reinforcing yarns or cords - Google Patents

Description

Dr. F. Zuitisteins. - Dc. E. A »» man Dr. R; Kqenigsberger - Dipl. Ph) It. R. Holzbauer Dr. F. Zumstein jun.

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Os, 10: 4477 / EG 46.2-9

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reinforcement game or similar code

The invention relates to the strengthening game uad-cord &, iasbas special Sariae and cords to strengthen dynamis-eli Chewable items.

Textile yarns and cords dynamically loaded for reinforcing rubber GegenstäEde ,, as re-ife'n o. Of the conveyor belts, are sufficient or "strongly turned, twisted, so that they resist pressure-pruchungen Beans in abusive use, also strong..

When twisted, the strength of textile reinforcements is increased and its modulus is reduced. For this reason, a Twist a compromise between strength and / or modulus and durability.

For certain types of high-performance products, for example with treads of radial tires and deformable tires Reinforcement of long conveyor belts is often the maximum achievable module or stiffness is functional and desirable. This requirement has in these two areas for the use of steel cables with little Cross-section out, although, if at all possible, also out Textile-made cables are used because of their easier handling. The moduli of some fibers »such as B. glass fibers or high modulus rayon are sufficient for high performance products provided the twist angles are very low are. However, this reduces the durability of the fibers.

According to the invention, a reinforcing yarn consists of an "encapsulated lightly twisted multiple _{yarn t} in which the capsule material consists of an elastic solid with a high Poisson ratio and the entire outer surface of the yarn penetrates to a depth which is sufficient, at least 30 % of the yarn to connect the forming threads with each other or to cement together.

The method according to the invention for the production of the reinforcing element is characterized in that a lightly twisted multiple yarn is coated with a liquid which can then be converted into an elastic solid with a high Poissoii ratio, the depth of penetration of the liquid into the multiple yarn being adjusted so that at least 30 % of those making up the yarn. Threads. together

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be cemented, and that the liquid in 'an elastic Solid is transferred.

The lightly twisted multiple yarn can consist of a conventional textile, for example rayon, nylon, polyester, Polyvinyl alcohol. By "weakly twisted" yarn is meant a yarn with a twist factor below 0.036, where the twist factor results from the twists of the yarn per inch divided by (specific weight χ yarn denier) .

The liquid coating "can be converted into an elastic one in any way Solid can be converted, for example by cooling or chemical crosslinking. That actually applied Process is of relatively little importance and depends only on the liquid used.

The Poisson's ratio of the elastic solid must be at least 0.45, measured with a maximum tensile elongation of 5 % . Particularly preferred is a Poisson's ratio of the elastic solid of at least 0.43, measured with an elongation of at most 5 %.

The liquid preferably consists of a race of glue made of a resorcinol-formaldehyde latex (RPL). Example more suitable RFL-iMasses are:

a) an aqueous dispersion of resorcinol-formaldehyde resin, Vinyl pyridine rubber and butadiene rubber and

b) an aqueous dispersion of resorcinol-formaldehyde resin and natural rubber.

Examples of other suitable liquids are solutions of polymers in organic solvents, for example vreisa eiae, solution of cis-glyisoprene in dioumyl peroxide containing η-hexane and liquid polymers, such as liquid ones

009831 / U60

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Polyurethanes.

The multiple yarn consisting of a textile can be used for the production of reinforcing cords. In this case the cords are preferably after the application of the liquid twisted on the yarn, but before the liquid is converted into the elastic solid, in order to create a pre-tension in the,

Avoid encapsulating material τ, χ. '

In this way, the cord can be produced by simultaneously using an "in-line" or planetary or rotating head cable machine and producing the cord, in which the liquid coating is applied to the yarn, shortly before the game Forming the cord come together. This process results in a symmetrical cord cross-section that is easy to handle.

The cords made from the lightly twisted multiple yarn preferably have helix angles less than 19 measured to the cord axis.

The lightly twisted encapsulated multiple yarns of the present invention have an improved resistance to pressure compared to untreated yarns. So is the module of cords made from the encapsulated yarns is higher than that of cords made from untreated yarns while having good durability is retained.

An additional advantage of the encapsulation is that the yarns are consolidated so that they are easier to handle and do not need to be shipped from the manufacturer. ^r need to be misled. The liquid coating is preferably applied to untwisted yarns as soon as possible after manufacture. Rayon is particularly suitable for the treatment because the

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Spinning speed for the special stage of enrobing suitable is.

If desired, the lightly twisted multiple yarns can be used
be pretreated with an adhesive prior to encapsulation. For example, multiple yarns made of polyester can be pretreated with blocked isocyanates, multiple yarns made of nylon in a similar manner, and multiple yarns made of rayon can be pretreated with a small amount of resorcinol in the spin finish during their manufacture. In particular, yarns made of polyvinyl alcohol can also be pretreated by applying zinc chloride or the like to the threads in order to increase the modulus of the surface layers.

The invention will now be based on those set forth below Examples explained in more detail.

00983-1 / U60

example 1

A 2,200 denier rayon yarn "Courtaulds Tenasco Super 140" and manufactured about 0.7 twists / cm (1.8 twists / inch) was bonded by a high rubber / resin ratio and Poisson's ratio of 0.46, measured at a tensile elongation of 5 % and dried at a temperature of 170 ° 0.

The composition of the RFL adhesive was as follows:

Wet weight (g)

Resorcinol 108

Formaldehyde (as an aqueous solution of 37 % by weight

in the volume concentration) 180 Gen-Tac-Latex (total solids content 40 wt .- ^) 1 807 "Pliolite 2104 ^ Labez (Total Solids Content

60% by weight ) 728

Water 1 535

Sodium hydroxide (as an aqueous solution of

10 % in volume concentration) 10

An examination showed that 50 to 70 % of the threads were bound together by the dried adhesive. Three such yarns were twisted on a Ring-Dopp-31-Mascr.ir.e at about 0.6 turns / cm (1.5 turns / inch). The oorde formed in this way was placed in a chewing compound with a hardness of 6 ° BS _{after vulcanization and:} shaped into a cylinder so that its axes were parallel to the axis of the cylinder. This cylinder was compressed on an Instron test machine. The value of the coupling modulus was calculated from the load-bending curve obtained from this. By comparing the compression modulus of a cylinder made only of rubber, the component attributable to the Oord was calculated. Similar measurements were made with cylinders, some with

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an RFL mass encapsulated Terylene-Polyester-Oord of Contained 3/1000 denier. The RFL stock had a high rubber to resin ratio and a Poisson's ratio of 0.46.

The terylene yarn was used to support the adhesion to the RFL pretreated with a diluted polyvinyl acetate latex. To the For comparison, similar measurements were carried out on rubber cylinders that

1) a rayon oord from "Courtaulds Tenasco Super I40" by 2 / 22OO denier and a twist of about 3 turns / cm (8.5 turns / inck) »the conventional way with a RFL adhesive was treated and

2) a measiag coated steel tire cord with a cable step vcn et v / a 7.6 mm (0.3 inch) and · the structure 6 χ 3 χ 0.15 mm auo 1 χ 3 χ 0.15 mm (0.0059 inch). The results are:

Tangent of the result. Ocrd- Oorä-T.yp Structure of twisted angle compression module

Herköainl.Rayon '2/2200 denier 0.10 2.1. 10 Γ ' slightly twisted (3.0 x 10 i ^ i)

the encapsulated ..,

Polyester 3/1000 denier 0.10 11 ·. 10 ^ slightly twisted (15.6-10 psi)

encapsulated - _A

Rayon 3/2200 0.10 12.5 x 10 <

(17.8 · Iu;, 3ij

Steel tires ^ ord 21 χ 0.15 BiQ "0.15, ¹ ^ ⁴ '| ° Z

(27.3 · 10 ysx)

The effect: - The treatment of the yarns with a rubber adhesive before the Oordlierstellmig clearly increases their compression modulus up to the vicinity of the compression module of steel tires co ri.

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Example 2

In the case of three yarns made from “Courtaulds Tenasco Super 1O5” rayon, the twist resulting from the manufacture was removed on a ring twisting machine. These yarns were then wired on a planetary machine to form a structure of about 1/1 turn / cm (2.5 / 2.5 turns / inch). The three yarns were brought together by passing them through a glass grommet attached to the axis of the twisting head. At the same time, an RPL adhesive with a high rubber / resin ratio and a Poisson's ratio of 0.48, measured at a tensile elongation of 5 %, was introduced through a side arm into the grommet so that the untwisted yarns were made prior to making the cord almost completely impregnated with RPL.

The composition of the RFI adhesive was as follows:

Wet weight (g )

Resorcinol 72

Formaldehyde (as an aqueous solution of 37 wt .- ^

in the volume concentration) 122

"Gen-Tac" latex (total solids content 40% by weight ) 1 807

"Pliolite" 2104 latex (total solids content

60% by weight ) 728

Water 1 573

Sodium hydroxide (as an aqueous solution of

10 % in volume concentration) 10

In order to allow the adhesive to dry and react, the cord was then passed through a chamber heated to 170 ° C. Examination under the electron microscope showed that the threads were almost completely encapsulated by the rubber compound was.

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'Example 3

Cords made in the manner described in Example 2 were wound on a frame and molded into rubber, so that a rubber block with parallel Oord reinforcement layers was formed near the top and bottom. Strips about 2.5 cm wide were cut from this block and examined on a three-point bending device, wherein the distance between the brackets was about 15 cm. The load was applied in the middle «This device was on attached to an Instron test machine. The loads and bends were - ,,, recorded at the moment the specimen buckled * Similar samples were taken using fiber optic Oörd - The ingredients are:

^: Main burden

Tangent of the ends / cm buckling of the mm structure % wir nwi nk ejL.s (per ... inch). Sample, _ (, kgm) "._.

encapsulated

Sayon Denier ö, 13 4-, 3 (M) 5.0 glass fibers Ö75-5 / 3 ö>, i-2 ^ p (11) x 3.7

The liapregnation of rayon results in a cord with a higher grain · = pfeBsiönsmodül as glass fibers.

If he used Vöigärneh's on the described in Example 2 Soaps of the FFSSe 175-1-3 were produced in this way manufactured, © read soaps are made with soaps from the normal. Production compared "* The results are as follows;

Roving tangent of the shden / cm number of d. Edge Öberlasi Qörd ......-. ~% M% rn wink els ( .ρχο; .ift öh) B _: ghi cht _: en kra £ fe. _r; . _t ^

Encapsulated

S & yön ν i 3 / 22OÖ

Here. ö; \ 3 6> 3 (16) 2 ok f & O

iayon Vi 2/2200

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1S39269

This shows that the use of encapsulation can produce tires which have the same stiffness and durability. like conventional tires, but with less textile material contain.

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Claims (1)

PATENT CLAIMS 1. Reinforcing yarn, characterized in that it contains a weakly twisted multiple yarn, the capsule material of which consists of an elastic solid with a high Poisson ratio and penetrates the entire outer surface of the yarn to a depth that is sufficient, 30 % of the yarn to connect forming threads with each other. 2. Yarn according to claim 1, characterized in that the Poisson ratio of the elastic solid, measured at a tensile elongation of at most 5 %, is at least 0.45. 3. Yarn according to claim 1 or 2-, characterized in that the elastic solid is made up of a medium clay mass Resorein formaldehyde latex is manufactured. 4. Yarn according to claim 1, 2 or 3, characterized in that it is made of rayon, nylon, polyester or polyvinyl alcohol consists. 5. Yarn according to claim 4, characterized in that the encapsulated lightly twisted yarn is pretreated with an adhesive before encapsulation. Process for the production of the reinforcing yarn according to one or more of claims 1 to 5 »characterized in that a lightly twisted multiple yarn is coated with a liquid which can then be converted into an elastic solid with a high Poisson ratio, in such a way that the inner ring depth of the liquid in the multiple yarn is at least sufficient to connect 30% of the threads forming the yarn to one another, and that the liquid is converted into an elastic solid. 009821 / UGO BATH ORIGINAL 7. The method according to claim 6, characterized in that the liquid consists of a solution of a polymer in one organic solvent. 8. The method according to claim 7> characterized in that the Liquid from a solution of Ois-polyisoprene in dicumyl peroxide containing η-hexane. 9. The method according to claim 6, characterized in that the liquid consists of liquid polyurethane. 10. Reinforcement cord, characterized in that it is at least consists of two strands twisted together, at least one of which consists of a reinforcing yarn one or more of claims 1 to 5 consists. . Process for the production of reinforcing cord according to claim 10, characterized in that at least two lightly twisted multiple yarns are coated with a liquid which can then be converted into an elastic solid with a high Poisson's ratio, the penetration depth of the liquid into the multiple yarn being at least sufficient 30 % of the threads forming the yarn are connected to one another, that the yarns are twisted together, and that the liquid is then converted into an elastic solid. 12. Reinforced article, characterized in that it is a Reinforcing yarn according to one or more of the claims 1 to 5 contains. 13. Reinforced article, characterized in that it has a The reinforcement cord of claim 10 includes. 009831/1480