Plasticizers – Benefits, Trends, Health, and Environmental
Plasticizers are colorless and odorless esters, mainly phthalates, that increase the elasticity of a material (e.g., polyvinylchloride (PVC)). Plasticizers soften the PVC to make it flexible and bendable. This opens up a huge range of possibilities for new applications.
Selecting Plasticizers for Adhesives and Sealants
Plasticizer migration can lead to degradation of properties during the life of the adhesive or sealant. It causes transfer of the plasticizer to unwanted surfaces (e.g., fogging of windshields in autos or contamination of electronic substrates) and It can also adversely affect the environment (see Regulatory Compliance below).
Additives for enhancing the drying properties of adhesives
A plasticizer is added to prevent brittleness in the final film [10]. In tape and stamps, the paper with adhesive has traditionally been run over a bar to produce micro cracks in the adhesives layer, thus rendering it noncurling. A similar effect has been achieved by solvent deposition of the adhesive [11], [12], [13]. In this process, a cold
Plasticizer - an overview | ScienceDirect Topics
Plasticizer loss causes plasticized PVC to shrink and become stiff. This can occur quickly at room temperature with low-molecular-weight plasticizers. As the molecular weight of plasticizer is increased, permanence at room or elevated temperature improves.
Plasticizer
A plasticizer ( UK: plasticiser) is a substance that is added to a material to make it softer and more flexible, to increase its plasticity, to decrease its viscosity, and/or to decrease friction during its handling in manufacture.
- Do plasticizers reduce the viscosity of adhesives & sealants?
- Plasticizers will reduce the melt viscosity of hot-melt adhesives and 100% solids adhesives & sealants. However, the addition of certain plasticizers to a polymeric emulsion will usually result in increased viscosity. This effect can be used to formulate a waterborne adhesive having greater coating thickness build-up.
- What is a plasticizer used for?
- A plasticizer is an additive used to increase flexibility or workability of a polymer system. Plasticizers typically affect the viscosity, lower the glass transition temperature, and lower the elastic modulus of a product. Phthalates and terephthalates are an example of effective plasticizer chemistries used in caulks and sealants.
- Why should you choose a plasticizer that is compatible with polymer?
- By choosing a plasticizer that is compatible with the polymer, it protects the plasticizer for leaching out of the product and thus losing the benefits of plasticization. Plasticizer permanence, or resistance to migration out of the adhesive or sealant, plays a role in the longevity of a product.
- What types of plasticizers are used in adhesives & sealants?
- Oils (like paraffinic, naphthenic, and aromatic) are used mainly as plasticizers in non-polar adhesives. These are generally used in the hot-melt adhesives and sealants. Base polymers include the mid-blocks of styrene-butadiene copolymers and polyolefin-based adhesives. Polymeric plasticizers are used frequently in adhesives and sealants.
- Why do we add plasticizer to a polymer?
- Plasticizer addition increases mobility of ionic impurities, which lowers electrical resistance. Plasticizer increases the mobility of polar groups in the polymer, which increases the dielectric constant and loss factor. The addition of plasticizer generally results in more efficient microwave heating.
- Do plasticizers reduce viscosity?
- Plasticizers will reduce melt viscosity of hot melt adhesives, and they will generally reduce the viscosity of 100% solids adhesives and sealants. The addition of certain plasticizers to a polymeric emulsion will usually result in increased viscosity.
