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Sumitomo rubber high durability rubber material technology breakthrough

Sumitomo rubber high durability rubber material technology breakthrough

China Construction Machinery Information

recently, Sumitomo Rubber Industry Co., Ltd. (hereinafter referred to as "Sumitomo rubber") released a scientific research achievement jointly explored with Leibniz polymer Institute (Dresden, Germany) ※. This achievement has found out the previously unknown principle of a phenomenon called "void" holes (the root cause of rubber cracking) in rubber molecules from its generation to the final rupture of rubber molecules. Based on this research result, Sumitomo rubber expects to develop rubber materials with more wear resistance than previous products, and also expects to develop high-performance tire products with "more lasting performance"

※ the Institute was founded in 1948, initially as the fiber Research Institute of textile mills. At present, CLK, the largest Polymer Research Institute in Germany, is working with major research teams in the world to conduct joint research

with the ever-changing environment of the automotive industry, Sumitomo rubber has previously proposed a new concept of tire technology development of "smart tire concept" (i.e. smart tire concept) to achieve "higher safety performance" and "better environmental performance" of tires. This research achievement just plays an important role in promoting one of the directions of its "smart tire" development concept, that is, tire "performance durability technology"

rubber failure is one of the causes of tire wear, and rubber failure is considered to be caused by the gradual increase of rubber fracture caused by molecular fracture in the rubber and "holes" at the micro level, but human beings have not been able to find out the root cause of "holes". In this context, Sumitomo rubber began to observe the mechanism of "holes" in synthetic rubber. In 2015, Sumitomo rubber made full use of the new material development technology "advanced 4D nano design" technology, identified the causes of "holes" by simulating the structure of the molecular level, and studied the technology to inhibit the generation of "holes". This research is based on two different experiments. At present, the changes of the internal structure of synthetic rubber and the mechanism of molecular motion can be directly observed, which makes it possible to develop high durability materials by controlling the elasticity of rubber

Experiment 1. Analyze the force, deformation and volume change of the rubber test article through CT scanning

experimental method:

clip the disc-shaped synthetic rubber test article in the middle of the metal plate with the same shape, fix it on the metal plate, and observe the relationship between the force and volume change when the rubber test article is deformed by stretching it with a force perpendicular to the direction of the metal plate. At the same time, the formation of "holes" in the rubber was observed through the CT of the rubber test object

results

if the synthetic rubber test article is subjected to a tensile force perpendicular to the metal plate, according to the characteristics of the rubber itself, the rubber test article will shrink in the direction perpendicular to the force. However, because the test object is pasted and fixed on the metal plate, it cannot shrink by itself when subjected to force, resulting in the expansion of the rubber, which enables us to directly observe the formation process of the rubber and its "holes" through CT

in addition, through this experiment, we also found that the environment for the formation of "holes" is also different, especially for synthetic rubber containing filling materials (such as silica and carbon black), the rubber failure is caused by the "holes" formed between the filling materials and polymers; For synthetic rubber without filler, the rubber failure is caused by the "holes" formed when the rubber molecules move

tensile stress-strain (deformation) curve of synthetic rubber

observation on the formation of "holes" in synthetic rubber containing filler materials (silica and carbon black)

synthetic rubber containing filler materials has "holes" between polymers, and these "holes" are connected with each other, resulting in the rupture of rubber molecules. With the reinforcement of the filling material, the "hole" will be restrained from becoming larger

observation on the formation of "holes" in synthetic rubber without filling materials

synthetic rubber without filling materials. Due to the typical characteristics of polymer materials adopted in the displacement spine device of rubber molecules, it is suitable for mechanical experiments in steel plants, quality inspection stations, scientific research, colleges and universities and other units, and "holes" are constantly increasing The increase eventually led to rubber cracking

Experiment 2. Confirm the characteristics of rubber fracture by X-ray small angle scattering method

experimental method

stretch the sheet synthetic rubber test article with notch along the horizontal direction, and observe the formation and increase of "holes" in the rubber at the top of the notch by X-ray small angle scattering method

results

by using the small angle X-ray scattering method to observe the change of rubber density at the notch of the sheet synthetic rubber test article, we found that the rubber density at the top of the notch is lower than that at other parts far away from the vertex, which indicates that many "holes" have been generated in the rubber at the top of the notch. From this, it can be judged that when the tensile rubber test object can be clearly visible in the horizontal direction for a long time, there is a "hole" at the top of the notch, that is, the torn part of the rubber, and this "hole" is directly related to the rubber failure

Sumitomo rubber hopes to develop more durable rubber than before with the help of this research result. In the future, Sumitomo rubber will also continue to accelerate the development of materials, establish rubber technology with "long-lasting performance", and make unremitting efforts to realize "smart tyre concept"