Core Tip: There are many different polyamide copolymers that can be identified in a simple way like polyamides. Sometimes, melting points can be used to distinguish different polyamides. The polyamide can also be identified by a color reaction with p-dimethylaminobenzaldehyde. The most important polyamides in the industry are nylon 6, 66, 610, 11 and 12. There are also many different polyamide copolymers which can be identified in a simple manner like polyamides (for example, the scoop has a burning horn in the flame). But it is not always possible to make a full sign. Sometimes, determining the melting point can distinguish different polyamides: Polyamide type melting point Nylon 6215~225; nylon 66250~260; nylon 610210~220; nylon 11180~190; nylon 12170~180 The polyamide can also be identified by a color reaction with p-dimethylaminobenzaldehyde. The acid formed after acid hydrolysis of various polyamides can be used to distinguish different polyamides. A 5 gram sample was heated with 50 ml of concentrated hydrochloric acid in a flask with reflux condensation. Reflux until most of the sample is dissolved. Then add activated carbon and heat the solution to boiling until the color disappears. Filter while hot. After cooling, the acid precipitates, is filtered, and is recrystallized in a small amount of water. If no acid precipitates, extract the filtrate with ether. The ether in the extract was evaporated and the residue was recrystallized from water. The melting points of these acids are as follows t Adipic acid (nylon 66) 152 ° C; azelaic acid (nylon 610) 188 ° C; 8-aminohexanoic acid hydrochloride (nylon 6) 128 ° C; 11-aminoundecanoic acid (nylon 11) 145 ° C; 12-aminododecanoic acid (nylon J2) 168 ° C Concerned about surprises Label: Type and method of identification of polyamide Previous: Common technical problems in engineering machinery maintenance (on) Next: How to reduce silicone bubbles PDC Cutting Tips(Pieces)
PDC cutting tips are cut on the basis of PDC compound pieces, which are usually welded to Grinding discs, drills, etc. and are used in the field of floor polishing and coal Mining.
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