Nylon cable tie material: chemical and physical properties of nylon 6
The chemical and physical properties of nylon 6 are similar to nylon 66, however, its melting point is lower and the process temperature range is wide. Its impact resistance and solubility resistance are better than nylon 66 plastic, but it is also more hygroscopic. Because many quality characteristics of plastic parts are affected by moisture absorption, it is necessary to fully consider this when designing products using nylon 6.
In order to improve the mechanical properties of nylon 6, various modifiers are often added. Glass is the most common additive. Sometimes synthetic rubber, such as EPDM and SBR, is added to improve impact resistance. For products without additives, the shrinkage rate of nylon 6 plastic materials is between 1% and 1.5%. Adding glass fiber additives can reduce the shrinkage to 0.3% (but it is slightly higher in the direction perpendicular to the process).
The shrinkage of molding assembly is mainly affected by the crystallinity and moisture absorption of the material. The actual shrinkage is also a function of plastic part design, wall thickness and other process parameters. Nylon 6 injection drying treatment Since nylon 6 can easily absorb moisture, special attention should be paid to drying before processing. If the material is supplied in waterproof packaging, the container should be kept tightly closed. If the humidity is greater than 0.2%, it is recommended to dry it in hot air above 80C for 16 hours.
If the material has been exposed to the air for more than 8 hours, it is recommended to perform vacuum drying at 105C for more than 8 hours. Nylon 6 injection molding process parameters Melt temperature: 240-250°C, 250-280°C for reinforced varieties
