Selecting Plasticizers for Adhesives and Sealants
As a result, plasticizers are used to improve peel and impact properties (often at the detriment of a decrease in tensile strength). Plasticizers have been used to give polymers a permanent adhesive character (pressure sensitivity), or to regulate their adhesion-cohesion balance to achieve removability.
Plasticizers – Benefits, Trends, Health, and Environmental Issues
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.
Eastman Plasticizers for Adhesives
Admex 6995 is a medium molecular weight, light colored, polymeric adipate with a mild ester odor. Benzoflex 9-88 is a high solvating benzoate ester plasticizer that can be used in a wide variety of polymer systems and applications. Its diverse uses include resilient flooring, adhesives, caulks, and sealants.
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.
Dibenzoate Plasticizers in Waterborne Acrylic PSAs
In addition to improving peel, the tack of the adhesive can be improved. However, plasticizers will reduce the holding power of the adhesive, which is an important consideration. Plasticizers will affect the performance of solution-borne acrylic adhesives in a similar manner.
- What is a plasticizer used for?
- Plasticizers have been used to give polymers a permanent adhesive character (pressure sensitivity), or to regulate their adhesion-cohesion balance to achieve removability. For example, plasticizers can be incorporated into peelable pressure-sensitive adhesive to soften the adhesive, and thus improve peelability and clean removal.
- Why is plasticizer migration a problem in Plasticized PVC film?
- In plasticized PVC film used for tape application, plasticizer migration to the adhesive layer can cause softening and loss of adhesion. Plasticizer selection involves trying to meet a combination of end-use performance requirements, processing needs, cost, and in some cases, specific regulatory requirements.
- 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.
- Why are plasticizers used as extenders?
- Plasticizers may also be one of the least expensive additives used in adhesives and sealants, and they can be used in relatively large concentrations depending on the application and formulation (up to 100 parts by weight per 100 parts of the base polymer). For these reasons, they are sometimes used as extenders for cost-reducing purposes.
- What is plasticizer permanence?
- Plasticizer permanence, or resistance to migration out of the adhesive or sealant, plays a role in the longevity of a product. Permanence can be affected by weathering such exposure to sunlight and extreme temperatures, or extraction by substances such as soapy water.
- 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.
