Alex K Chen Posted March 9 Report Share Posted March 9 https://www.perplexity.ai/search/what-epoxy-resins-ROMayGHUT2K3C1QNVisXEA Quote Epoxy resins based on bisphenol A diglycidyl ether (BADGE) have been traditionally used for the inner coating of metal cans due to their excellent properties 1 2 . However, in recent years, there has been a shift towards developing new epoxies without using monomers that affect the endocrine system, such as bisphenol A. Companies like Sherwin-Williams have introduced new epoxy coatings like valPure V70, which are safe and perform similarly to BPA-based epoxies 2 . These new epoxies are already being used in beverage cans in California and aim to replace BPA-containing liners in food cans as well 2 . Epoxy resins play a crucial role in preserving the contents of food cans by creating a protective layer that separates the food or beverage from the metal of the can, preventing corrosion and maintaining freshness and safety 3 . Since the 1950s, epoxies have been integral in ensuring a long shelf life for canned goods, allowing consumers to store food for extended periods while preserving taste, texture, and color 3 . The transition away from BPA-based epoxy linings in cans has led to the adoption of alternative coatings like non-BPA acrylic or polyester epoxies, olefin polymers, and other materials to ensure food safety and meet regulatory standards 4 . While these alternatives aim to reduce exposure to harmful chemicals like BPA, there are ongoing concerns about the safety and environmental impact of these substitutes. Acrylic resins, polyesters, PVC-based resins, and oleoresins are among the alternatives used in can linings, each with its own set of advantages and potential hazards 4 . In summary, epoxy resins play a vital role in food can coatings by protecting the contents from metal corrosion and ensuring long shelf life. The industry is moving towards safer alternatives to traditional BPA-based epoxies to enhance consumer safety and address environmental concerns. Quote Link to comment Share on other sites More sharing options...
Alex K Chen Posted March 9 Author Report Share Posted March 9 Quote Acrylic resins are polymeric materials containing acrylic monomers such as acrylic acid, methacrylic acid, and acrylate monomers like butyl acrylate and methacrylate monomers such as methyl methacrylate[1][2]. These resins can be in solution, dispersion, or solid form and are known for their good chemical and photochemical resistance[2]. Acrylic resins can be categorized into two main types based on their composition: 1. **Pure Acrylic Resins**: These resins contain only acrylic monomers with different functionalizations like carboxyl groups, non-reactive groups, reactive groups, and glycidyl functions that influence the properties and applications of the resin[2]. 2. **Complex Acrylic Resins**: Styrene is commonly used in these resins, resulting in Styrene-Acrylic resins. While less expensive than acrylic monomers, they enhance water resistance, alkali resistance, and hardness. However, they may be prone to yellowing and chalking, limiting their applications[2]. Acrylic resins find extensive use in various coatings such as industrial coatings, architectural coatings, powder coatings, and radiation cure coatings due to their versatility and performance characteristics[5]. They are crucial components in paints like latex paint (emulsion paint), offering benefits like better stain protection, water resistance, adhesion, crack resistance, and durability compared to vinyl-based paints[1]. Additionally, acrylic resins are highly weatherproof and durable, making them suitable for outdoor applications where longevity is essential[1]. In summary, acrylic resins are derived from acrylic monomers and offer a wide range of properties that make them valuable in various industries for applications requiring chemical resistance, durability, and weatherproofing capabilities. Citations: [1] https://en.wikipedia.org/wiki/Acrylic_resin [2] https://coatings.specialchem.com/selection-guide/acrylic-resins [3] https://www.sciencedirect.com/topics/materials-science/acrylic-resin [4] https://patents.google.com/patent/US5250596A/en [5] https://www.ulprospector.com/knowledge/4320/pc-acrylic-resin-fundamentals/ acrylate was one of the NMPs found in the CU study Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.