Types of principal plastics and their characteristics２
- Thermoplastic resin
- Thermosetting resin
- 1. & nbsp; Polystyrene
- It is counted as one of "5 large general purpose resins" and it is an inexpensive plastic used for familiar items such as daily necessities. There are two types of transparent "general-purpose polystyrene" and "impact-resistant polystyrene" with rubber added. The former is superior in that it is transparent and lightweight, while the latter has impact resistance, the heat resistance is deteriorated due to the characteristics of rubber.
- 2. & nbsp; Acrylic resin
- Also called "polymethyl methacrylate resin", it is plastic that is counted as one of "four large transparent resins". 94% light transmittance is higher than general glass, "organic glass"
It is also called. Although it has the feature that the rigidity is large, there is a weak point that it is vulnerable to shocks on the other hand.
- 3. Modified polyphenylene ether resin
- It is a plastic that was improved and developed as a substitute material for conventional polyphenylene ether resin around 1967. It is the lightest material among engineering plastics, and the balance of mechanical properties is good. It is excellent in heat resistance and electrical characteristics, it is non-toxic, so it has been used as food equipment and medical equipment.
- 4. Polybutylene terephthalate
- It is a type of polyester-based engineering plastic. Among engineering plastics, it is particularly excellent in heat resistance and durability, and it is excellent in long-term thermal stability. Due to its low water absorption rate, it is excellent in dimensional stability, and it is also excellent in electrical properties among thermoplastic resins. However, it is weak against strong alkali and phenols and there is a weak point that it hydrolyzes under high temperature and high humidity environment because of ester group.
- 5. Ultra high molecular weight polyethylene
- Polyethylene with increased molecular weight by prolonging polyethylene molecule production time. It has the highest level of impact resistance among plastics and also excellent abrasion resistance. Lightweight enough to float on water, it is also excellent in dimensional stability due to low water absorption. It is also used as a food hygiene safety resin due to its high chemical resistance, but there is a weak point that it is difficult to bond it.
- 1. Melamine resin dt>
- It is industrialized plastic in 1938. It is characterized by high surface hardness and scratch resistance. Among thermosetting resins, it is particularly attractive that it is inexpensive, but it is weak against strong acids and strong alkalis, and weak points in weak impact resistance. It also has disadvantages that the dimensional change due to moisture absorption and drying is large. dd>
- 2. Silicon resin
- It is also called "silicone" plastic. It is a material boasting high heat resistance that can withstand continuous operation temperature 200 ℃, 316 ℃ or higher if it is filled. It is excellent in electrical characteristics and surface / interface characteristics, but it is weak against strong acid, strong alkali, hot water, and weak in hydrocarbon solvents. dd>
Since there are plentiful kinds of plastics, it is important to choose plastics suitable for the application. Once you decide what to use, let's think about what properties are suitable and choose the best material.