Ruilangda® Achieved technological innovation achievements in the field of automobiles and vehicles, and obtained three consecutive invention patent authorizations within six months. Recently, the company obtained another national invention patent authorization, with the patent name: A two-component modified epoxy adhesive for bonding bus skin and its preparation method, invention patent number: 202211652765.4

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The connection between the bus skin and the skeleton is traditionally achieved through welding, but this method inevitably results in welding points. No matter how it is polished or coated with atomic ash, it will cause the appearance of the bus to be uneven, seriously affecting its aesthetics. In addition, as people tend to pursue the trend of lightweight development, a large amount of aluminum and lightweight materials are used instead of steel. Therefore, the welding of steel and aluminum has become a technical problem that urgently needs to be solved in the field of passenger (automotive) vehicles. As a result, adhesive for bus skin has emerged.
At present, single component polyurethane structural adhesive is commonly used for bonding bus skin. But when using polyurethane adhesive, it needs to be cleaned, activated, and coated as a base before it can be bonded; Moreover, the bonding area of the bus skin is large, and the tensile and shear strength of the polyurethane adhesive is low, requiring local spot welding; Due to the moisture absorption curing of single component polyurethane, it takes 24 hours to cure to a depth of 3mm (usually with a bonding surface width of 10-15mm). The curing speed and positioning are slow, especially in winter when the temperature is low and the humidity is low, which slows down the curing process and requires fixtures to hold for longer periods of time, resulting in low production efficiency. Although ordinary epoxy adhesives have high strength, do not require a primer, and are easy to apply, they have the disadvantages of poor toughness, seismic resistance, and peel resistance, making them unsuitable for bonding bus skins.
Therefore, it is necessary to develop a new type of epoxy adhesive for bus skin bonding that is easy to operate, fast to locate, has good toughness, and high strength.
Compared with the existing technology, the beneficial effects of the present invention are:.
1. Compared with ordinary epoxy adhesives, the two-component modified epoxy adhesive of the present invention is environmentally friendly, can achieve rapid bonding and positioning, and has good flexibility, shock resistance, adhesion, and peel resistance. It is a very practical adhesive for bonding bus skin.
2. Compared with polyurethane adhesive, the two-component modified epoxy adhesive of the present invention has higher strength and does not require local spot welding; And no activator or primer is required during bonding, fast curing, and high production efficiency.
3. When using the modified epoxy adhesive of the present invention for bonding, solvents such as alcohol and acetone can be used to easily clean the oil stains on the bonded surface, without the need for activation or primer coating operations. This can achieve strong bonding to materials such as steel, aluminum, glass, engineering plastics, ceramics, etc. It can be widely used in the fields of automobiles, high-speed trains, mechanical equipment, etc. The entire bonding process is simple and practical.