Industry news

1. Introduction

Nylon 66, also known as nylon 66, polyamide-66, or polyhexamethylene diamine, is obtained by condensation polymerization of hexamethylene diamine and adipic acid. Its comprehensive performance is good, with advantages such as high strength, good rigidity, impact resistance, oil and chemical resistance, wear resistance, and self-lubrication. Especially, its hardness, rigidity, heat resistance, and creep performance are better, and the raw materials are easy to obtain and the cost is low. Therefore, it is widely used in industries, clothing, decoration, engineering plastics, and other fields. PA66 has a higher melting point than PA6, excellent heat resistance, high elastic modulus, and low water absorption. As a molded product, its characteristics are superior to PA6, especially due to its good heat and oil resistance, making it suitable for making mechanical components around automotive engines and components of electronic and electrical products that are prone to heating. Currently, PA66 accounts for 63% of applications in vehicles, 22% in electronic, electrical, and office automation equipment, and 5% in mechanical and optical applications. Therefore, the market sales of PA66 composite materials are growing rapidly [1]. In recent years, with the rapid development of industries such as automobiles, electrical appliances, communication, electronics, and machinery, higher and stricter requirements have been put forward for PA66 products, which has also accelerated the process of high-performance PA66 and its composite materials.

2. Characteristics:

Good resistance to stress cracking

Polyamide with the best wear resistance

Good heat resistance, self extinguishing material

Good self-lubrication, second only to polytetrafluoroethylene and polyformaldehyde

Excellent oil resistance, soluble in phenol and formic acid

High mechanical strength and good chemical stability

Adding carbon black can improve its weather resistance

3. PA6 and PA66

The difference between PA6 and PA66 is that their chemical and physical properties are similar, but PA6 has a lower melting point, a wide process temperature range, and stronger impact and dissolution resistance. Aston Martin's standard requirement for pedal materials is PA6. Let's compare the differences between PA6 and PA66:

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performance

PA66

PA6

Structural unit

Polycondensation of Adipic Acid Hexanediamine

Caprolactam polycondensation

melting point

Up to 260 ℃

The melting point is relatively low, about 40 ℃ lower, and the process temperature range is very wide

Heat resistance

Good heat resistance

Poor temperature resistance