Antioxidants protect plastics and other materials against thermally induced oxidation. This process can lead to a number of undesirable effects, including discoloration, changes in melt viscosity, and deterioration of mechanical properties. Primary antioxidants, such as hindered phenols, and secondary antioxidants, such as phosphites.
Flame retardants are used to reduce the flammability of plastic materials. Polymers are increasingly used in new and varied applications where specific mechanical, thermal and electrical are required. Particularly in transportation and building applications another important property is flame retardancy to prevent the burning of polymers eg. PE, PP and PA.
Nucleating agents are most widely used in PP , where they provide three main benefits: property enhancement, improved molding productivity, and increased transparency. Some special nucleating agents produce spherulites so small that they do not scatter visible light, providing transparent PP. Products that provide this effect are referred to as clarifying agent
Light stabilizers are a group of additives that have been developed to minimise or prevent the damage to plastics caused by exposure to the environmental parameters of light, heat and air. Which provide protection from UV radiation by interfering with the physical and chemical processes of light-induced degradation according to different mechanisms.
Silane Coupling Agents
Silane coupling agents are compounds whose molecules contain functional groups that bond with both organic and inorganic materials. Which is acts as a sort of intermediary which bonds organic materials to inorganic materials. It is this characteristic that makes for improving the strength of composite materials, improving adhesion, and surface modification.
Commercially available peroxides from seven different structural groups provide a broad range of reactivity. Crosslinking reactions are possible in polyethylene and elastomers using dialkyl peroxides and peroxyketals. By making use of promotion systems in polyester resins, ketone peroxides and benzoyl peroxide can be used at room temperature.
Coagent is the chemical links between molecular chains to form a 3-dimensional network of connected molecules. The vulcanization of rubber using elemental sulfur is an example of crosslink, converting raw rubber from a weak plastic to a highly resilient elastomer. Which can enhance the properties of polymer interface, e.g. thermosets and coatings.
Photoinitiators are small molecules that are sensitive to light. Upon light absorption they undergo photochemical cleavage to produce reactive species that will interact with the active components in formulations. In other words, one could say that photoinitiators take the energy from light and transform it into chemical energy to induce chemical reactions.
Light Diffuser can provides a range of diffusion, transmittance and haze levels for LED lighting applications in back-light modules and LED lighting plastic covers. It is ensure superior diffusion and high optical performance in transparent materials, including PC, PMMA and PS, used in LED plastic covers and backlight modules.
Thermal Stabilizers function mainly by substitution of the labile allylic chlorine atoms that are intermediates in the dehydrochlorination process. By this mechanism they significantly enhance the heat stability of the polymer during both melt processing and end use. It is use in such as exterior components, film and sheet, extrusion, injection molding, etc.
SEBS is hydrogenated SBS with higher content of 1,2-vinyl structure. After hydrogenation, the copolymer is composed of polystyrene (S) – polyethylene (E) – polybutylene (B) – polystyrene (S) and abbreviated as SEBS. Thus SEBS shows improved application temperature, oxidation resistance, creep resistance, and compression set.
Lubricant not only have the desired result on melt viscosity, but often have other beneficial effects such as smooth, glossy surfaces on the finished article and improved dispersion of pigment and fillers. Which provide benefits in plastics processing such as enhanced mold release, better processability, improved dispersion of fillers, pigments, etc.