| 摘要 |
A fluid transfer multi-layer pipe made of a polyamide material is provided to improve resistance about fuel and engine lubricant and mechanical properties at low or high temperature. A fluid transfer multi-layer pipe made of a polyamide material comprises a selective layer(1) formed with nylon-11/12-polyamide; a middle layer(2) containing at least one polyamide A1 having a chemical formula X,Y/Z or 6,Y2/Z to 50~100 percent and nylon-11/12-polyamide to 0~50 percent; a selective layer(3) made of nylon-11/12-polyamide; and an inner layer formed on the above continuously jointed layers to be contacted with an inner transferred fluid. The X represents a residue of aliphatic diamine having 6~10 carbon atoms. The Y represents a residue of aliphatic dicarboxylic acid having 10~14 carbon atoms. The Y2 represents a residue of aliphatic dicarboxylic acid having 15~20 carbon atoms. The Z represents a residue of lactam and a residue of an alpha, omega-amino carboxylic acid. The X1 represents a residue of diamine, and the Y1 represents a residue of diacid. The weight ratio Z/(X+Y+Z) and Z/(6+Y2+Z) is 0~15 percent. |
