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<body> <p><h2>Producing <b>rubber</b></h2> parts is a very complex, multi-step <h2><b>process</b></h2>. In the last step of this <b>process</b> the uncured <b>rubber</b> is in general given a form by pressing it into a <b>Mould</b> and curing it. This cure in the <b>Mould</b> lets the <b>rubber</b> part retain the shape of the <b>Mould</b> even after being removed from it (and of course the cure also gives the special <b>rubber</b> properties). But because uncured <b>rubber</b> and <b>rubber</b> at high temperatures (cure temperature) is very sticky this last step gives problems: a) the finished article can show defects because the uncured <b>rubber</b> sticks to the <b>Mould</b> surface instead of smoothly <b>flow</b>ing to completely fill the <b>Mould</b> or b) the cured article can stick to the <b>Mould</b> making it difficult or even impossible to de<b>Mould</b> the part without tearing it. To overcome these problems <b>Mould</b> <b>Release</b> <b>Agents</b> have been used for a long time and are still widely used. This paper aims to give a better understanding GRP of <b>Mould</b> <b>Release</b> <b>Agents</b> and their benefits and drawbacks by briefly sketching their history and discussing the chemistry and functioning of modern semi-permanent <b>Release</b> <b>Agents</b>. The products of Schill + Seilacher are being used successfully worldwide in the rubber and latex industry as well as in the textile, paper and leather industry and many others. <h1>Mandrel rubber peptizer tire industry dispersing agent chemical additives latex additives silicone lubrication additive compounds latex emulsion homogen mould release agent rubber processing additives dispersion coating</h1> Cured <b>rubber</b> articles sometimes show a certain porosity, meaning that small cavities are found in the <b>rubber</b> matrix. This is most easily seen on the surface of the finished product where small faults (so-called pinholes) appear. Lubricant These holes are created by air or volatile materials (e.g. water) within the uncured <b>Compound</b> that evaporate and subsequently expand under the high temperature curing conditions if the applied pressure is too low to keep them from blowing. Especially in undercured <b>Compound</b> these gaseous materials can expand when the <b>Mould</b> pressure is <b>Release</b>d at the end of the cure cycle. If the blowing occurs because of an undercured <b>Compound</b> the obvious solution is an increased cure time to make sure the product is properly cured. This of course lowers the output so it might be advisable to use a faster curing system. Struktol <b>rubber</b> <b>additives</b> <b>Supplier</b> <b>chemical</b> <b>Producer</b> <b>chemical</b> <b>process</b> <b>rubber</b> <b>process</b> <b>chemical</b> <b>Supplier</b> <b>rubber</b> <b>Dispersion</b> <b>coating</b> <b>Latex</b> <b>rubber</b> <b>Silicone</b> emulsions Amino Fluid <b><b>Silicone</b></b> cover a wide filed in the modern <b>chemical</b> industry. Wherever classic products meed physical limitations it is possible to find an alternative with <b><b>Silicone</b></b>. Remarkable features of silcones are inter alia particularly high temperature stability, good lubricating properties, excellent soft grip of good hydrophobizing. Resin Our enterprise, as a well-known <b>Producer</b> of <b>additives</b> and speciality <b>process</b>ing <b>Agents</b> has made use of thise possibilities and offers far-reaching solutions to the <b>rubber</b> and plastics industry, for textile and leather applications and for the manufature of polishes, care products and laggings, ereas which call for the high quality of <b><b>Silicone</b></b>. In this brochure you will find part of our product range which is continuously improved and enlarged. As a <b>Supplier</b> of <b>chemical</b> specialities we are in a position to produce tailor made produte for any application. At the same time our development team attempts to meet the demands of your application and is always prepared to give maximum technical assistance on the spot. Silicone Emulsions <h3>Struktol</h3> In most colloidal <b>Latex</b> <b>Dispersion</b> the particles acquire a negative electrical charge by adsorption of surfactant anions. They are considered to be maintained in the colloidal state by electrical repulsion between the particles. Schill + Seilacher have a range of stabilizers, anionic surfactants, developed for specific requirements. Tackifier <img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="<img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="chemical rubber additives " title="chemical rubber additives" title="<img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="chemical rubber additives " title="chemical rubber additives"> Antioxidant <b>Fatty Dispersion</b> The ageing of <b>Latex</b> products is affected by a large number of factors many of which interact. The major factors involved are oxygen, heat etc. Antioxidants are substances which when present either in the <b>Latex</b> or the products made from it, reduce the rate of oxidation of the polymer. Antifoam The efficiency not only depends on the <b>chemical</b> structure, but also on the particle size. Specialty Activator The Struktol antioxidants are environmental friendly aqueous <b>Dispersion</b> produced via a special <b>process</b> resulting in a narrow particle size distribution with more than 90 % of particles less than 1 mm in size. The increased particle surface area (5 times greater than conventionally produced <b>Dispersion</b>; 500 times higher number of particles per gram of antioxidant) lead to a more uniform distribution of the antioxidant, a rapid dissolution into the <b>rubber</b> phase and better performance at low levels of addition. Release Agents <h2><b>Antifoam</b> <b>Agents</b> are <b>additives</b> used to prevent foam</h2> formation or to destroy existing foam in dipping mixes or <b>Latex</b> <b>Compound</b>. Antiwebbing <b>Agents</b> minimize web formation in <b>Latex</b> dipping. A web is the liquid membrane that forms, between adjacent parts of a dipping former when the former is being withdrawn from the <b>Latex</b> Tackifiers are materials added to <b>rubber</b> mixes to increase the surface tack of the <b>rubber</b>. Tackifiers are usually resinous materials, but for <b>Latex</b> technology are most conveniently used in Soap the form of emulsions or <b>Dispersion</b>. However, not all emulsions of resins are suitable, as the dispersed phase particle size and the amount and type of surfactants present can influence the tack obtained. Metal Soap Compound The surface of films made from <b>rubber</b>, especially natural <b>rubber</b> Preparation, exhibit a strong tendency to stick together (surface tack) and this characteristic can lead to problems during storage or transport of <b>Latex</b> products. Anti-tack <b>Agents</b> are materials designed to eliminate the self-adhesion of <b>rubber</b> products and are applied to products to form a thin, non-tacky layer on their surfaces. Hose <h2><b>Mould</b> <b>Release</b> <b>Agents</b> make de<b>Mould</b>ing</h2> after vulcanisation easier. They form a semi-permanent <b>Release</b> <b>coating</b> on the <b>Mould</b> surface. <b>Mould</b> fouling is reduced and the friction of the <b>Mould</b> surface is reduced. Through these effects the <b>Mould</b> down time is substantially reduced and thus so are the production costs. The amount of scrap is also reduced. Specialty GRP Preparation Amino Fluid <b>Antifoam</b> <b>Agents</b> <b>peptizer</b> <b>peptizer</b> promote the reduction of polymer molecular weight by <b>chemical</b> means thus increasing the efficiency of <b>rubber</b> mastication. This results in reduced viscosity and nerve thus improving the <b>process</b>ability of the polymer and <b>Compound</b> mixed with it. Our improved <b>Dispersion</b> <b>peptizer</b> ensure a much faster incorporation and a better distribution of the <b>peptizer</b>, helping to overcome the problem of hot spots and improving batch to batch uniformity. <img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="<img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="chemical rubber additives " title="chemical rubber additives" title="<img src="http://www.struktol.de/img/struktol_logo_klein.gif" alt="chemical rubber additives " title="chemical rubber additives"> <h2><b>homogen</b>izers and tackifiers</h2> <b>homogen</b>izers make the blending of different polymers easier and promote their compatibility. They make the mixing mass stay compact and thus increase the mixing effect, leading to improved and faster distribution and more <b>homogen</b>eous <b>Compound</b>. Often <b>homogen</b>izers increase the tackiness of <b>Compound</b> but also improve their <b>flow</b> properties. The mechanical properties of the vulcanisate can be improved by the use of <b>homogen</b>izers. In <b>Compound</b> based on butyl <b>rubber</b>, a lower gas permeability has been observed in addition to the improved <b>process</b>ability and filler distribution.</p> </body>