Foaming agents
Additives
Foaming Agents The expanding chemical agents are reactive additives that release gas during the processing of thermoplastic materials. Therefore, they allow the production of foam materials for a wide variety of applications. A thermal reaction of the additives contained in a blowing agent emits gases that allow the production of stable expanded plastic material. There are two main groups of expansion agents, which differ substantially according to their reaction mechanism: endothermic (heat consumption) exothermic expansion agents (heat release) The expansion agents are mainly used to reduce the density, which leads to a reduction in the weight of the final product and a reduction in costs. Additional or improved product characteristics are another advantage of the use of chemical blowing agents. Some of the advantages are: Improvement in thermal and acoustic insulation Improvement of dielectric properties Improvement of depreciation properties Prevents the formation of surface depressions during injection molding Decorative effects Endothermic expansion agents When heat is added, these blowing agents decompose and generate neutral gases in the environment. Often these gases are carbon dioxide and water vapor; The most well-known active ingredients are carbonates and carboxylic acids. As the heat is consumed to initiate and propagate the reaction, the substances are called endothermic expansion agents. Its advantage lies in the fact that when the heat supply is interrupted, gas production is stopped and resumed if more heat is supplied. As a result, endothermic expansion agents are easy to handle during processing. Many of the endothermic expansion agents that we use are approved for use with food and, therefore, can be included in many packaging solutions. Exothermic agents After an initiation process with radiation, heat or other forms of energy, the exothermic swelling agents upon decomposition release heat and gases such as nitrogen, carbon dioxide and ammonia. The decomposition reaction then continues autonomously due to the heat released and can not be interrupted by simple cooling measures. In contrast to endothermic expansion agents, significantly higher gas yields can be achieved with exothermic expansion agents. By using additional additives, we can influence the initial energy and, therefore, the initial decomposition temperature. Properties The expansion agents favor the decrease in density to make the finished products lighter. The expanders also improve backwash and mold filling phenomena. Backwash is a phenomenon that occurs during the molding phase and causes incomplete filling of the mold; as a consequence, the printed article appears "empty". To solve this type of problem, expansion agents are used that, when releasing gas inside the mold, compress the molten material, favoring the filling thereof in a homogeneous manner. The use of these masters reduces the mechanical characteristics of the product. Possible process problems Improper handling of the temperature can cause the material to flow back during extrusion or molding, with possible gas formation. The percentage and temperatures of use will be established in the machine and in the process involved. Products range Our experience in process technologies makes us one of the main suppliers of expanding agents. This is because the agents in expansion have a great commitment to development and production due to their latent tendency to decompose when they are not properly handled in powder form. Our solutions of exothermic and / or endothermic expansion agents can be individually prepared to satisfy any desire for modification. In addition to combinations of exothermic and endothermic expansion agents, we can also provide chemical expansion agents as nucleating agents for physical and chemical expansion. If very fine and regular expansions are required, a nucleating agent is the best solution. ADC azodicarbonamide ADC Activated azodicarbonamide 5-PT 5-Phenyltetrazole OBSH 4,4'-Oxidi (benzenesulfonohydrazide) TSH P-Toluene Sulfonyl Hydrazide (Blowing agent) Sodium bicarbonate (citric acid) |  Celd open  Celd close  | |