Metal zipper use precautions

 

◆ metal zipper teeth discoloration principle

 

First, the chemical properties of copper alloys

 

The chemical properties of copper alloy is acid, alkali, oxidant or reducing agent from the chemical reaction, easy to change color. When the chemicals remaining on the cloth are chemically reacted with the fastener elements, the slider or the open end of the metal zipper, the zipper may become discolored. The chemical reaction in high temperature, high humidity conditions (sewing products after steam ironing, sealed in plastic bags and stored for a long time, etc.) are more prone to occur. This situation does not belong to the zipper quality problems.

 

Second, the chemical reaction of the example of discoloration

 

1, oxidation bleach (H2O2) → black → (CuO) or red (CuO2)

 

2, reducing bleach (Na2SO3) → black (CuO, CuS) or red (CuO2)

 

3, sulfide or HS2 gas surplus conditions → black (CuS)

 

4, CL2 conditions of excess gas → light yellow (CuCl2)

 

5, acidic compounds and chromium compounds (Cr2O3) → black (CuO), red (CuO2) or blue (CuSO4)

 

6, steam ironing or rain wet → blue (Cu (OH) 2)