How to Solve the Challenges Brought by the New Trend of Automobile Industry?

In recent years, environmental protection has become the main theme of the development of the automotive industry.

The market demand for low-VOC products is increasing. In addition, the design of motor vehicles is becoming increasingly lightweight, showing a more compact assembly space, non-metallic materials, and more sophisticated processing requirements.

The process of digitization, intelligence, and networking of automobiles promotes the prosperity of automotive electronic products but also puts forward more stringent requirements on the choice of materials. Motor vehicles need to be equipped with more wiring harnesses and sensors, vibration, heat, and other extreme environments in the car, which will bring a new test to the service life of electronic products. In addition, consumers pay more attention to the comfort and safety of motor vehicle driving and riding. Humanized design such as vibration reduction and noise reduction, anti-fatigue and sheath design, smart car lights are being considered more and more.

1

Self-adhesive technology effectively solves the challenges brought by the new trend of automobiles

These automobile development trends have brought higher requirements for the design and production of automobile parts, and self-adhesiveness has become the most effective technology for combining parts. The design requirements for high-temperature resistance have prompted silicone rubber products to replace EPDM and NBR. The change of metal materials to aluminum-magnesium alloys or PBT and PA66 has led to greater challenges in the design and bonding of many sealing materials. The transformation of the processing technology from FIPG/CIPG to MIPG has made the liquid silicone LSR injection processing technology more popular. In addition, self-adhesive technology allows the silicone to be bonded to plastics, metals, and glass. It has the advantages of no undercuts, no solvents, and no need for primers. It is suitable for various designs and can be bonded and vulcanized in one step, without assembly, achieving high automation.

Automotive Connector Single Wire Seals

2

Liquid silicone rubber has self-adhesion, oil permeability, and high resilience

Liquid silicone rubber can be cured into an oil-repellent elastomer with a high degree of resilience in a very short time. It is especially suitable for sealing parts of soft and hard combined moldings.

The main features of the product include self-lubricity, that is, the formation of a silicone oil film on the surface reduces the coefficient of friction; self-adhesive, that is, direct adhesion to the substrate without any primer auxiliary; low compression deformation, that is, by improving rebound Realize long-term reliable sealing effect. Typical applications include automotive connector single wire seals, and plug housings with radial seals made by the spray method for automotive electrical and electronic equipment.

The self-adhesive oil-permeable liquid silicone rubber series has become an automotive wiring harness with the comprehensive advantages of no need for primer coating additives, low friction coefficient, high automatic processability, ultra-low temperature elasticity (-50°C), high temperature reliability (180°C), etc. Ideal for sealing product design.

As a new type of oil-permeable self-adhesive liquid silicone rubber, the hardness is higher than other existing products in the series, which is Shore A 50. After the cured sample is placed under pressure at 125 degrees Celsius for 22 hours, the compression permanent deformation rate is only 10%. The molded seal made of it can maintain its function for a long time under high temperature. In addition, the cured silicone rubber products can maintain flexibility at temperatures as low as minus 40 degrees Celsius. Therefore, this new liquid silicone rubber is ideal for sealing applications in engine compartments or car bodies.

In addition, as a shear-thinning (thixotropic), fast-crosslinking material, this new liquid silicone is suitable for highly automated injection molding processes. The self-adhesive formulation of liquid silicone rubber allows the product to attach itself to various thermoplastics, including polyamide (PA) or polybutylene terephthalate (PA), which is often used as a hard component for soft and hard composite molded parts ( PBT), etc. The silicone can be firmly attached to many metal surfaces without the need for primers. Therefore, if the appropriate mold technology and flow channel design are used, the liquid silicone rubber and the substrate (thermoplastic or metal) can be directly realized through the injection molding process. ), which greatly improves production efficiency and effectively reduces costs.

3

Self-adhesive, low friction, no oil penetration, and secondary vulcanization

The oil-permeable liquid silicone rubber can be used in any application that is not affected by the oil. For example, for components under the hood, oil and dust adhering to the oil film are usually not a big problem. However, for applications that need to be kept clean, wire harness seals produced with oil-impregnated products require a cleaning process to clean the surface of the oil, which means additional processes. Non-oil-permeable self-adhesive low friction Liquid silicone rubbers are very suitable for automotive electronics applications because they do not require pretreatment, that is, they have excellent adhesion to the thermoplastic polymer in the connector housing. At the same time, there is no longer the risk of silicone oil contaminating other objects during assembly or use.

Liquid silicone rubber uses an excellent adhesion promotion system to make it self-adhesive. The product does not contain small molecular silicone oil, and the special molecular structure network design enables it to form a lubricated surface. The dynamic friction factor of the product is about two-thirds lower than that of standard self-adhesive silicone products of the same hardness. Liquid silicone rubber has the typical characteristics of silicone after curing. It is suitable for any application that needs to lubricate the silicone surface. It can be used in applications that require no silicone oil leakage, such as automotive electrical and electronic systems, or traditional single-line seals and diameters. To the connector housing of the seal. The plug of the seal made of liquid silicone rubber is easy to connect, and the cable can easily pass through the molded single-line seal. At the same time, there is no longer the risk that silicone oil will contaminate other objects during assembly or use.

In addition, the liquid silicone rubber also has a low compression deformation rate, which helps the Wiring Harness Single Wire Seal to maintain long-term efficacy. Even if secondary vulcanization is not required, it also has excellent mechanical properties, which can improve the production efficiency of component manufacturers.