Method of aramid cord treatment

FIELD: technological processes.

SUBSTANCE: invention is related to production technology of synthetic cord, in particular, to impregnation and thermal treatment of aramid cord, and may be used in tyre and rubber industry. Aramid cord of all brands is impregnated with latex-resorcin-formaldehyde or latex-resorcin-formaldehyde-soot compounds on the basis of latexes "ДБА"-1, "СКД"-1s and 5% solution of resin "СФ"-282, with concentration of 12-14%. Then cord is thermally treated to residual moisture of 0.5-1.0% at 120-140°C with load of 400-800 kg/cloth. Cord produced by this method is repeatedly impregnated and thermally treated according to the same modes.

EFFECT: simplified treatment of aramid cord; reduction of power inputs; improvement of its physical-mechanical properties and increase of operability of tyres and rubber items.

1 tbl

 

The invention relates to a method of processing aramid cords used in the manufacture of tires, rubber membranes, hoses, etc. and can be used in tire and rubber industry.

The known method (Application of Japan No. 1174675, publ. 11.07.89,) impregnation aramid cord impregnating compositions based on epoxy compound containing two or more epoxypropyl in the molecule, latex, resorcinolformaldehyde tar and benzene compounds in which, in addition to the constituencies HE included variable elements (Cl, Br, H, SH). The impregnated fabric is heated and dried.

The disadvantage of this method is the complexity of the technological scheme.

Closest to the proposed method [Illmore, Saathi, Ligashesky. Mounting technology tire cord to rubber. - M.: Chemistry, 1993, 86-88, 92 (prototype)] the technical essence and the achieved technical result is a method of processing aramid cord at the first stage adhesive based on epoxy resin and polyisocyanate, in the second stage, impregnating compositions the concentration of 15-20% with a subsequent heat treatment without tension at a temperature of from 200 to 245°C.

The disadvantage of this method of treatment is to increase the viscosity of the impregnating 15-20% solutions prepared on the basis of concentrated resorcinol legalnoi resin, it limits the time of their application, the use of the adhesive of the first stage of harmful polyisocyanates, low strength impregnated and heat-treated yarns, high energy costs, "combustion" cotton weft threads at a high temperature.

The technical result of the invention is the simplification of the technological scheme of processing aramid cord at the expense of abandoning the use of polyisocyanate and epoxy resin, the improvement of physical and mechanical properties of impregnated cord, use when processing Korda stable during storage impregnating compositions on the basis of Russian latex, reduce energy consumption, processing capabilities as aramid and hybrid cord with any weft domestic equipment.

The essence of the proposed technical solution is that the aramid cord or hybrid aramid & nylon cord with a predominant content of aramid yarns impregnated with a composition concentration of 12-14%, latex DBA-1, ACS-1c, 5%solution of the resin SF-282 and 20-22%dispersion of carbon black, thermoablative at a temperature of 120-140°under tension 400-800 kg/canvas to a residual moisture content of 0.5-1.0%. Thus obtained cord secondary process on the proposed modes. The second stage is performed immediately after the first stage and is and can be a time lag.

Lower the temperature and the concentration of the impregnating composition reduces the strength of the connection cord with rubber, higher impractical impregnation, as it does not improve the quality impregnated and heat-treated cord. Lower tension does not allow for the tension of the cord is sufficient for its passage through the Assembly impregnation-treatment, higher causes a decrease in strength aramid cord. The duration of the heat treatment should be sufficient to remove moisture to 0.5-1.0%.

Latex-resorcinolformaldehyde impregnating composition is prepared from a 5%solution of Novolac resorcinolformaldehyde resin, for example, the SF-282 and latexes, for example, vinylpyridines, DBA-1-butadiene copolymer, butyl acrylate and methacrylamide, carboxyl-containing butadiene SKD-1c or 5%solution resorcinolformaldehyde resin prepared from resorcinol and formaldehyde, and the above latexes known technological schemes. Additionally, the process of preparing an impregnating composition includes a step of the additive impregnation of dispersion of carbon black also known technological scheme. As a dispersion of carbon black used 20-22% aqueous solution of a channel or furnace carbon black. Soothes is the ingredients in the impregnating composition: 100 parts by weight of latex; 10-25 parts by weight of resorcinolformaldehyde resin; 20 to 40 parts by weight of technical wereda.

The proposed method is applicable for processing aramid cords of all brands and is implemented, for example, on-line TIC-80-1800, as follows.

Before beginning processing aramid cord fabric brand Rusar-75 (aromatic paraboloid with heterocycles in circuit with the composition of the halogenated copolymer of comonomer (diameter X) or chlorinated paraphenylenediamine (TU 8378-041-05138230-2006), patterns of 58.8 axhh, or aramid hybrid fabric brand Rusar-C (aromatic paraboloid with heterocycles in circuit with the composition of the halogenated copolymer of comonomer (diameter X) or chlorinated paraphenylenediamine plus nylon (TU 8378-041-05138230-2006), patterns of 58.8 techh+NC 93,5 Tex, roll length 360-720 p.m. join with the previous roll through a layer of rubber compound, followed her cure for connecting the press, then the roll soaked in a bath of impregnating composition concentration of 12-14%, containing a mixture of latexes SKD-1-carboxyl-containing butadiene latex (GOST 11604-79), DBA-1-butadiene copolymer, butyl acrylate and methacrylamide (TU 2294-347-05842324-38) in the optimal ratio of 50:50 and 5% solution of the resin SF-282-Novolac resorcinolformaldehyde resin (TU 6-07-402-90) or a mixture of latexes KFOR-1c, DBA-1, 5% solution of the resin SF-282 and 22% of the variance of t is khnichenkova carbon K-354. The ratio of ingredients in the impregnating composition: 100 parts by weight of latex; of 16.5 parts by weight of resorcinolformaldehyde resin SF-282, and 28.3 parts by weight of carbon black. The speed of passage of the cord fabric on line 30-40 m/min provides the content of residual moisture in the cord fabric at the outlet of the drying chamber of 0.5-1.0%. Then the cord fabric is subjected to heat treatment in a drying chamber at a temperature of 120-140°under tension 400-800 kg/canvas.

After drying chamber cord fabric is cooled, passes seaming device, is fed to the rollers, and the operation is repeated as described above.

The novelty of the present invention is two-fold processing aramid cord impregnating composition containing latex DBA-1, ACS-1c, a 5%solution of the resin SF-282 and 20-22%dispersion of carbon black concentration of the composition is 12-14%, followed by heat treatment at 120-140°under tension 400-800 kg/canvas to a residual moisture content of 0.5-1.0%.

Comparative analysis of specific performance of the proposed and existing method of impregnation and heat treatment aramid cord shown in the table.

12-13
The method of processing aramid cord and the results of its analysis
The method of processing CordaPhysico-m is a mechanical indicators impregnated and heat-treated cord
The concentration of the impregnating composition, %The temperature of the heat treatment, °The tension during the heat treatment, kgf/clothThe breaking load, NElongation at 10 kgf, %Elongation at 20 kgf, %Elongation at break, %The strength of the connection cord with rubber, N.
DBA-1+ACS-1C+5% solution of the resin SF-282Vinylpyridine new latex PLIOCORD VP-106S+66% concentrated resin SF-282
With a dispersion of carbon blackwithout dispersiveness carbonControlProduction
Untreated aramid cord Rusar-758350,61,25,2--
The placeholder15200-7251,2 1,65,175104
Phys-fur indicators cord after a single impregnation and drying the cord on the proposed method
12-13--120-140400-8008051,11,55,187116
-13-14-120-140400-8008051,11,55,178107
Phys-fur indicators Corda after two impregnation and drying the cord on the proposed method
12-13--120-140400-8007851,21,65,3100140
-13-14- 120-140400-8007851,21,65,391127
Raw hybrid aramid cord Rusar-C7960,81,25,5--
Phys-fur indicators cord after a single impregnation and drying the cord on the proposed method
12-13--120-140400-8007361,21,66,3103138
-13-14-120-140400-8007361,21,66,393128
Phys-fur indicators Corda after two impregnation and drying the cord on the proposed method
--120-140400-8007261,31,76,4110145
-13-14-120-140400-8007261,31,76,4102137

As can be seen from the data given in the table, the proposed method improves the strength characteristics (breaking load) and the strength of bonding with rubber for impregnated and heat-treated cord.

The technical result of the proposed method is the possibility of implementing a simplified schematic processing aramid cord of any brand in the domestic equipment domestic latexes, the reduction of energy consumption, improvement of physical and mechanical properties of aramid cords and thereby increase the efficiency of tires and rubber products.

1. The method of processing aramid cord, including the impregnated cord latex-resorcinolformaldehyde composition and heat treatment, distinguish the different topics what impregnation followed by heat treatment carried out twice, with impregnation spend 12-14%composition containing latex DBA-1, ACS-1c and 5%solution of the resin SF-282, and the heat treatment is at 120-140°under tension 400-800 kg/canvas to a residual moisture content of 0.5-1.0%.

2. The method according to claim 1, characterized in that the latex-resorcinolformaldehyde composition further comprises a dispersion of carbon black.



 

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1 tbl

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1 tbl, 32 ex

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