DE1770590A1 - Process for the production of rubber compounds for direct bonding with textile material - Google Patents

Description

Process for the production of rubber compounds mum immediate Joining with textile material The invention relates to a method for stabling and application of rubber compounds to improve adhesion in the immediate vicinity Connect with textile material. Viscose, polyamide can be used as textile material and polyester in the form of cross weave or cord, as is customary for the production of Kfa tires, V-belts, technical hoses and conveyor belts is used. As rubber compounds, all compound systems, such as those for German production of the above-mentioned articles are customary to be registered here The adhesive must be used to connect directly to the tertiary material, according to @ # the method corresponding to the invention to achieve increased adhesion, be mixed in.

The previously known method to improve the adhesion in the immediate Joining rubber compounds with textile material use resorcinol and a Formaldehyde dispenser in the form of clay hexamethylenetetramine as an adhesive system, whereby at the same time finely divided silica is also used to further increase adhesion.

For sufficient adhesion, at least 2.5 parts Resoro @@ and 1.5 parts of hexamethylenetetramine per 100 parts of chewing substance required. This relatively none The proportion of resorcinol causes a higher consumption of resorcinol, e.g. for the German manufacture of car tires as opposed to the use of Tire cord impregnated with resorcinol formaldehyde latex tm thread. It arises-n daduroh increased costs when using the mixtures with Resorcin @ls adhesive for direct connection with textile material.

The necessary addition of Hexamethylenet @ amine as a formaldehyde donor von me @ r also @ part (according to the requirements not less than 1.5 parts) often shortens the @nvulkandsation of the adhesive mixtures and then disturbs the Verarheitungssicherheitbeit.

Two of the invention is the production of adhesive mixtures based on SER rubber, polyisoprene rubber, polybutadiene rubber or theirs Blends that require a shorter mixing time at low temperatures, ensure secure adhesion, cause low material costs and where there is no disturbance of the vulcanization.

It is the object of the invention to provide a suitable mixing process partial use of well-known adhesives su develop that allows dt. proportions the known adhesive to 1.5 parts Resor @ im and 0.75 parts hexamethylenetetramine belittle.

According to the invention, this object is achieved because # adhesives at a temperature above 1200 C in a premix of the rubbers mentioned in the Kneaders are mixed in or at the beginning of the mixing process for the production of Maftmischungen orerden incorporated in aen rubber and hexamethylenetetramine Temperatures below 1000 C is mixed in. Bs was still found because # still Obtained much better effects by using lignin as an adhesive will.

The invention is explained in more detail below using exemplary embodiments are @ 8) Incorporation of the Resox @ in amount (1.5 parts) together with light active Filler (sweeping active, finely divided silica clay 10 parts to 100 parts Rubber) ia the rubber to be finished (SBR rubber, Polyisoprene rubber, Polybutadiene rubber or its blends) in the inside Kaster boi one temperature @ over 1400 C in 4 minutes, use of this premix for the subsequent production @lung of rubber tables.

B) Adding resorcinol and light-colored filler at the beginning of the mixing process in the mixer together with the rubber and final mixing of the mixes in one work step.

C) Mixing in the hexamethylenetetramine (0.75 parts) must be done on the Mixed whales take place at a temperature of around 1000 C.

It was also found that $ da # liability through co-use of lignin can be further increased, while at the same time the proportion of @examothylenetetramine can still be lowered. Use of a mainstay of the following composition 1.5 parts Resorciz 1.5 parts Lignin 0.5 parts Heramethylenetetramine are the below A to C to be used. When making a premix However, according to method A, the mixing temperature can be reduced to 1300 C and the mixing time can be reduced to 2 minutes.

By using 1.5 parts of resorcinol, using cheap Lignin and reduction of hexamethylenetetramine to 0.75 bsw. 0.5 part occurs decisive lowering of the material boxes compared to the known processes higher proportions of resoroin and there is no disturbance of the scorching of the adhesive mixtures on.

Examples 1. Comparison of the adhesive values when using the mixing process according to the invention (adhesive resorcinol and hexa @ ethylentatramine) Resorcinol and adhesives procedure in the kneader Adhesive silica in of at the end of the premix on the roller Meddling Mixing process Mach method A Resorcinol 3 2 3 2.5 1.5 1.5 Heramethylene 1.5 1.25 1.5 1.25 0.75 0.75 tetramine Liability kp (H test) Cord 12.3 10.3 12.1 12.2 11.5 13.3 1650 / 2x2 Reyon The example shows that when using method A (preparation of premixes) according to the invention with 1.5 parts of resorcinol and 0.75 parts of hexamethylenetetramine, higher adhesion is achieved than 3 parts of resorcinol and 1.5 parts of hexamethylenetetramine according to the conventional mixing processes .

2. Influence of the use of lignin on the adhesion of the basic mixture, as for example vulcanization 45 min, 147 ° C Resorcinol 1.5 1.5 Hexamethylenetetramine 0.75 0.5 Lignin @ 1.5 Making the Premix in the kneader Temperature ° C 140 130 140 130 min 4 2 4 2 Liability kp (H test) 12.8 11.5 13.4 13.2 Cord 1650 / 2x2 Reyon The example shows that when lignin is also used, reliable adhesion is achieved even at low temperatures and with a shorter mixing time.

The attached representations (Figures 9 and 2) of the time - temperature - Diagrams show the influence of the mixing conditions in both adhesion systems.

3. Comparison of the adhesion values of methods A and β with 1.5 resorcinol, 1.5 lignin and 0.5 Heramethylenetetramine as adhesive base mixture as in Example 1 Vulcanization 45 min, 147 ° C Procedure AB Liability kp (H test) Reyon cord 1650 / 2x2 13.9 12.8 1650/2 10.2 9.8 Polyamide cord 1680/2 12.3 11.0

Claims (3)

Claims 1. Production of adhesive mixtures on the basis of SHR rubber, polyisoprene rubber, polybutadiene rubber or their blends thereby gekanseichnet that adhesive at a temperature above 1200 C in a Mixing the mentioned rubbers in the kneader are mixed in at the beginning the niche process for the creation of adhesive mixtures incorporated into the rubber and Ha @ amethylenetetramine is mixed in at temperatures below 100 ° C. 2. Manufacture clay adhesive mixtures make claim 1, characterized in that that lignin is used as an adhesive. 3. Production of adhesive mixtures according to claims 1 and 2, thereby Marked because re @ orcin, lignin and active finely divided silica are used as adhesives is used.