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Sheath material design

The most commonly used plastics for connector housings are polyamide (PA), polybutylene terephthalate (PBT), ABS, polypropylene, etc. Polyamide is customarily called nylon and there are dozens of varieties. Compared with ordinary plastics, its advantages are wear resistance, good toughness, light weight, good chemical resistance, heat resistance, cold resistance, easy molding, self-lubricating, non-toxic, and easy to dye. The disadvantages are high water absorption, low dielectric properties, and poor dimensional stability. According to its characteristics, it is mainly used for connectors with general requirements such as low heat resistance requirements, low size requirements, and complex shapes. Applied to the body and cab of the car. Polybutylene terephthalate (PBT) is a thermoplastic crystalline resin. The performance of pure PBT resin is not outstanding, and some indicators are still very low. For example, the heat distortion temperature is only 58°C, and the molding shrinkage rate is as high as 1.5%~ 2%, the mechanical properties are mostly inferior to other engineering plastics. However, after glass fiber composite reinforcement, the overall performance is greatly improved. For example, compared with 30% glass fiber reinforced PBT resin, the tensile strength of PBT pure resin is increased from 55MPa to 135MPa, and the dielectric strength is increased from 2 16 / KV mm to 2 24 / KV mm , heat distortion temperature increased to 210°C; molding shrinkage showed anisotropic trend, flow direction

0.25% for the vertical direction and 1% for the vertical direction. Glass fiber reinforced PBT resin can be used for a long time at a high temperature of 130~140°C. It is the highest among general engineering plastics, and its mechanical strength is also among the best. It also has excellent electrical properties, chemical corrosion resistance, friction reduction and wear resistance, and flame retardancy. , Dimensional stability and good formability. Based on the above characteristics, reinforced PBT materials are widely used in automotive connectors, especially in places with high temperatures such as engine rooms, and cannot be replaced by other materials. ABS plastic is a thermoplastic copolymer of three monomers of acrylonitrile, butadiene and styrene. ABS plastic parts have disadvantages such as low heat resistance, low cold resistance, poor weather resistance and opaqueness, non-flammability, and high brittleness. Therefore, ABS plastic is not suitable for automotive connectors with high weather resistance requirements and complex shapes, and is mainly used in the body and cab of the car. The main advantage of polypropylene is that it has high bending fatigue life and good heat resistance, and the product can withstand temperatures above 100°C (long-term working temperature 110°C). However, its strength and stiffness are low, and its impact toughness is poor at room temperature and low temperature; and it is easy to age, and it will deform and deteriorate under the action of light and heat. Therefore, it is not selected as a connector material, and is only suitable for general cable ties and clamp feet.

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