What is difference between saturated and unsaturated polyester resin?
The key difference between saturated and unsaturated polyester resin is that the saturated polyester resins have no double bonds in their main chain whereas the unsaturated polyester resins have double bonds in their main chain. The most common and very useful form is the unsaturated form.
What is saturated polyester resin?
Saturated polyester resin is formed by the reaction of polybasic acids and polyols, and its feature includes excellent flexibility and hardness. It is mainly used in can coating, rolled steel, non-stick pan, ink, adhesive, PET coil, metallic baking paint such as automotive paint, and so on.
What is the best polyester resin?
The Best Polyester Resin: 3M Bondo Fiberglass Resin This resin is compatible with many different surfaces, such as fiberglass, wood, metal, and even masonry.
What is saturated and unsaturated polyester?
The key difference between saturated and unsaturated polyester resin is that the saturated polyester resins have no double bonds in their main chain whereas the unsaturated polyester resins have double bonds in their main chain.
What is unsaturated polyester resin?
Unsaturated polyester resin is one of the most popular thermoset polymers for use as a matrix in composites for applications in the marine and aerospace industries because of its unique properties such as high strength and modulus, high resistance to water, room temperature cure capability, and transparency.
What are the disadvantages of polyester resin?
Polyester resin has the following disadvantages:
- Strong styrene odour.
- More difficult to mix than other resins, such as a two-part epoxy.
- The toxic nature of its fumes, and especially of its catalyst, MEKP, pose a safety risk if proper protection isn’t used.
- Not appropriate for bonding many substrates.
Should I use epoxy or polyester resin?
Polyester is an adequate adhesive but not as good as epoxy. As a general rule, the tensile strength of a polyester bond will be around 20 percent weaker than the same bond made with epoxy. That makes epoxy resin usually the best choice for fiberglass repair work.
What is unsaturated polyester?
Unsaturated polyester, any of a group of thermosetting resins produced by dissolving a low-molecular-weight unsaturated polyester in a vinyl monomer and then copolymerizing the two to form a hard, durable plastic material.
What is the density of unsaturated polyester resin?
3.1. 2 Density of unsaturated polyester resin
| Number | Material name | Density |
|---|---|---|
| 1 | Woven | 570 (g/m2) |
| 2 | Chopped strand mat (CSM) | 300 (g/m2) |
| 3 | Unsaturated polyester resin (UPR) | 1.15 (g/cm3) |
| 4 | Multi-walled carbon nanotubes (MWCNTs) | Bulk: 0.04 (g/cm3) |
Why is epoxy so expensive?
Epoxy resins are more expensive to produce than other types of resins. This is because the raw materials required for manufacture cost a lot more than other low-end resins and the process of the production is complicated with a low tolerance for errors.