Functionality and Application Requirements of Adhesives

(2) Intelligent exploration of bonding

The so-called intelligence is to fully reproduce the three special functions of the above-mentioned biological materials in materials. From this point of view, the distance between the adhesive and the completely intelligent target is still far away. However, even if these functions are not fully realized, the material itself has only a small part of it, such as repair and healing functions, or functions to reduce and relieve stress. It is very valuable to prevent the destruction of the adhesive, and it can also be regarded as intelligent. A part of the transformation.

The issue of reversibility of one of the two disadvantages of bonding has been discussed previously and will not be repeated. Another study is mainly focused on the prevention of adhesion failure.

At present, attempts to repair or heal in order to prevent destruction or destruction have involved the development of adhesives that can modify and reduce stress through deformation, such as elastic adhesives and SGAs. This has been previously described; secondly, through adhesive joints. Changes in form or shape, increase in strength, or ease of stress, such as changing the joint from single lap to double lap, oblique laps to wedges and step laps to increase the bonding area, again Equal thickness lapping becomes unequal thick-step lapping, which makes the joints from unequal rigidity to rigidity, so as to improve the adhesion performance and prevent damage [15]; the second one is the polymer composite material. heal. The microcracks induced by heat and fatigue are a long-standing problem for polymer adhesives. Cracks in structural polymer materials reduce their mechanical properties and cause electronic failures in microelectronic components. The University of Illinois conducted a study on this and found a self-healing approach. This result was published in the British Journal of Nature published on February 15, 2001. The brief approach is to mix and cure the microcapsules with diameters of 0.05mm to 0.2mm and the catalyst particles that can cure the healing fluid with a healing fluid to form epoxy resin-based composite materials. Once internal cracks occur, the microcapsules break and the healing fluid flows out of the crevice. When it contacts the catalyst, it solidifies and heals. This kind of material with the self-healing and self-healing function of biological material will soon be put into use.

6 Conclusion

Through the analysis of simple to complex bonding examples of paper bonding, screw locking, general structure to aerospace bonding, the following points can be summarized:

(1) With the diversification of application requirements, it is no longer possible to consider the adhesive itself in isolation, but to examine it in joints, adhesive components, and even the entire system containing the adhesive structure, thereby presenting adhesives. The higher performance requirements such as versatility, bond reversibility, balance of properties, and durability of use have contributed to the development of adhesives with high performance, high functionality, versatility, and intelligence.

(2) The high performance of adhesives is the improvement of their adhesive strength, etc., which is the basis of functionalization; and intelligence is the functional development of adhesives when they meet higher performance requirements. Therefore, "functional specialty" of functional adhesives refers not to purely high performance, but it should refer to different high functionality and versatility on the basis thereof.

(3) The special function of adhesives mainly includes two aspects: one is to make the adhesive part meet the function of high performance requirements; the other is to make it operate or use under conditions with no or less negative effects or benefits. Decomposition and destruction functions. The "benefits" mentioned here include economic, social, and environmental benefits. Especially the latter, due to people's concerns about ecological destruction, environmental pollution, and thinking about sustainable development strategies, and the latter aspect related to improving efficiency, saving resources, saving energy, and protecting the environment, have attracted extensive attention. This is not only due to the conscience of scientific and technological personnel, but more importantly, it comes from strict regulations.

(4) The continuous improvement of the performance requirements of adhesives has increased the difficulty of its development. It is a challenge, but it is also an opportunity to provide a good space for its functionalization. The improvement of performance requirements promotes the diversification and high functionality of adhesives. In turn, the high functionality, versatility, and intelligence of adhesives can better meet the needs of various parties and will promote the development of itself and related technologies.

Zou Zhiping
(Heilongjiang Institute of Petroleum Chemistry, Harbin 150040, Heilongjiang, China)

China Adhesive Information Industry Network

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