Polybutylene Terephthalate
Polybutylene terephthalate (PBT) is a translucent or opaque, crystalline thermoplastic polyester resin, also known as polytetramethylene terephthalate, which was first synthesized by German scientist P. Schlack in 1942.
The production process of PBT resin is mainly divided into ester exchange method (DMT method) and direct esterification method (PTA method), among which DMT method includes intermittent DMT method and continuous DMT method. It has the characteristics of high temperature resistance, moisture resistance, oil resistance, good electrical insulation performance, chemical corrosion resistance, fast molding, easy molding and low moisture absorption.
Main features of PBT
The ester bonds and aromatic rings in PBT ensure strong chemical resistance and good electrical properties. PBT is also usually blended with glass fiber or other fillers to improve mechanical properties and heat resistance.
A. Excellent mechanical properties, especially strength and toughness
B. Can be reinforced with glass fiber or other fillers to improve rigidity, strength and heat deformation temperature
C. Low water absorption
D. Excellent electrical properties
E. Excellent chemical resistance (including resistance to organic solvents, weak acids, weak bases and other agents)
F. Low water absorption leads to less dimensional change
Practical considerations to keep in mind when considering PBT include that long-term exposure to high temperatures in humidity may cause PBT to hydrolyze due to the ester bonds contained in PBT. In addition, PBT is not very resistant to strong acid or strong alkaline solutions. Therefore, the use of PBT in environments that pose these hazards requires careful attention to all relevant risk factors.
Application Fields
In developed countries and regions such as the United States, Europe and Japan, the main application fields of PBT are concentrated in the automotive industry, electronic appliances and office machinery. Specifically, the consumption of PBT in the field of electronic appliances accounts for 44%, 65% and 45% in the United States, Europe and Japan respectively; while the consumption in the automotive industry is 47%, 25% and 22.5% respectively. This shows that different regions have different application focuses on PBT. The United States is more inclined to the automotive industry, while Europe uses it more in the field of electronic appliances.
The specific proportion of PBT application fields in China: electronic appliances account for about 60%, automotive/mechanical industry accounts for about 24%, optical fiber coating accounts for about 8%, fiber accounts for about 3%, and others account for about 5%. Electronic appliances are the main application fields.
A. Automobile:
B. Mechanical equipment:
C. Energy-saving lamps
D. Cooling fans
E. Connectors
F. Coil skeletons
G. Relays
H. Optical cables and optical fibers
Safety
Regarding the toxicity and skin irritation of PBT, according to scientific research and relevant literature, PBT itself is non-toxic, has good biocompatibility, and has no obvious irritation to the skin.
Packaging, Transportation and Storage
PBT particles need to be moisture-proof and pollution-proof. The packaging materials should be sealed, such as plastic bags or composite bags, and the product information should be clearly marked on the packaging. During transportation, PBT particles should avoid severe vibration and collision. It is best to use a closed truck to ensure moisture-proof.
During storage, PBT particles should be placed in a dry and ventilated environment, avoid direct sunlight and high temperature, and the warehouse temperature and humidity should be well controlled. At the same time, there should be good ventilation conditions to prevent the particles from getting damp or chemical reactions.
In addition, the warehouse needs to be equipped with fire-fighting facilities to prevent fires, and anti-static measures, such as the use of anti-static shelves and floor materials. In this way, PBT particles can be effectively protected during packaging, transportation and storage to ensure that quality and performance are not affected.
PBT Recycling
Resource reuse: PBT recycling can not only reduce resource waste, but also reduce the energy consumption required to produce new materials. Through recycling, the use cycle of resources can be effectively extended.
Environmental protection: Plastic pollution is a major environmental problem facing the world today. Effective recycling of PBT materials can reduce the impact of waste on the environment and reduce the risk of soil and water pollution.
Economic benefits: By recycling PBT, the circular economy of chemical raw materials can be promoted and the raw material costs of enterprises can be reduced. The rise of the recycling industry can also create jobs and promote economic growth.
PBT Recycling Methods
Mechanical recycling: Mechanical recycling is the most commonly used PBT recycling method at present. This method mainly converts waste PBT materials into recycled particles through processes such as cleaning, crushing, and granulation. These recycled particles can be directly used to produce new products.
Chemical recycling: Chemical recycling refers to the decomposition of waste PBT into its monomers or other usable chemicals through chemical reactions. This process can achieve a higher recovery rate and the resulting product quality is relatively high, but its technical difficulty and cost are high.
Heat recovery: Heat recovery technology uses the heat energy of waste PBT to generate electricity or heat, and can also convert it into fuel. Although this method can effectively reduce waste, it is relatively inefficient in terms of resource utilization.
Plastic crusher, as an efficient and environmentally friendly mechanical equipment, is gradually becoming a key link in the waste plastic recycling industry chain. It can quickly crush various waste plastic products into small particles, laying the foundation for subsequent recycling and truly achieving the environmental goal of turning waste plastics into recycled raw materials.
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