PPR Plastic Fittings Selection And Use Is Quite Important
With the development of the automotive industry, manufacturers in order to reduce the car's own weight, improve performance, and increase the flexibility of the design, increasingly popular PPR Plastic Fittings. From the door trim, dashboard, to the engine components and hood, etc., the general passenger car PPR Plastic Fittings currently account for about 10% of all parts. As a key part of the performance of PPR Plastic Fittings, the choice and use of lubricants is very important.
Lubricants can reduce friction to reduce wear and noise. Such as the use of lubricants on plastic gears or sliders, can reduce noise; a variety of plastic used in the door panels need lubrication, including rails, sliders and rollers, window lifter, micro-motor and exterior mirrors ; The use of dry-film lubricants before assembling the door trim to the door trim eliminates the harsh noise generated during the movement of the vehicle, and can effectively reduce the noise on the assembly line using the flocked plastic belt and improve the assembly line productivity.
Although lubricants are widely used in automotive metal parts for many years, the use of lubricants for PPR Plastic Fittings is not long. Unlike the choice of metal parts lubricant, it is difficult to choose the right PPR Plastic Fittings lubricant, and the use of inappropriate lubricants can cause serious consequences.
There are a wide variety of plastics used in automotive parts, and each plastic grade and compatibility with the lubricant is not the same. Compatibility will also be affected by the size of additives, fillers and plastic molecules. Not only according to the different plastic raw materials to select the appropriate lubricant, but also consider the physical properties of plastic. There are a number of physical characteristics of plastics that must be taken into account when selecting lubricants suitable for PPR Plastic Fittings. Generally speaking, automotive plastics from the application can be divided into two kinds of functional plastic and plastic structure, the choice of lubricant is also different.
Functional plastic, mainly engineering plastics, is used in the form of lubricating part materials for gears, sliders and other auto parts. Under normal circumstances, all kinds of functional plastics (such as polyamide, polyacetal, etc.) has good oil resistance, and many traditional automotive metal parts with lubricants and grease have good compatibility. However, since some of the additives in the lubricant will corrode the plastic, it is necessary to check the additive composition in the lubricant before use. In addition, relevant tests such as immersion testing are required to verify the compatibility of the actual lubricant used with the plastic. And some functional plastics, such as polyacetal and nylon, with self-lubricating properties, without adding lubricant.
Typically, the transmission will be used in the PPR Plastic Fittings of the lubricant, the use of lubricants can extend its service life. Many metal lubricant additives will react with the metal surface, resulting in wear-resistant lubricating film. However, since the melting point of most thermoplastics is lower than the temperature at which the chemical reacts with the additive and the surface activity of the plastic is lower than that of the metal, the properties of the conventional additives are difficult to be fully exhibited when the plastic is lubricated. It should be noted that, because the hardness of plastic than the metal is low, if the choice of inappropriate solid lubricants, plastic will be due to friction caused by greater wear and damage. A suitable solid lubricant can be selected as an additive to produce self-lubricating plastic.
In addition, in most cases, not only need to lubricate the plastic contact surface, but also the plastic and metal contact surface lubrication, which need to consider the lubrication of metal and plastic properties, but also consider the lubricant and plastic materials phase Capacitive.
Structural plastic, most of the general modified plastics, such as modified polyolefin, ABS, polystyrene, etc., used in interior trim, dashboard, the device shell and other auto parts. In the application of structural plastics, it seems that there are few applications that require a lot of lubrication, but in the sliding and connecting parts, proper lubrication can reduce the noise, vibration and movement of the feeling. In this case, check the structure of plastic and lubricant compatibility is also important than the functional plastic, can not choose to dissolve or corrosion of plastic lubricant. In addition, should also be careful to cause plastic cracking and cracking of chemical substances. If these factors are ignored, the appearance or function of the component will be problematic, such as the occurrence of a brake system failure.
When choosing a lubricant, the appearance is an important consideration. Where you see a lubricant, you often need a transparent or translucent product that often requires the kind of lubricant that the driver and the passenger are exposed to and do not stick to the body. Dry film and semi-dry film lubricants to meet this requirement. It is necessary to check the compatibility before coating the lubricating film and curing it, since many dry film lubricants contain solvents that discolor and crack the plastic.
At present, poly-α-olefin base oil as a substitute for mineral oil is a popular choice, very suitable for a variety of plastics. Perfluoropolyether is a chemically inert lubricant that does not corrode plastic and can be used in a wide range of plastics. But because of the high price, so its use is subject to certain restrictions. However, with the new lubricant has been developed, the automotive PPR Plastic Fittings of the lubrication problem will be satisfactorily resolved.