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导致硫化橡胶脆化的因素有哪些?

来源: 时间:2020-05-18 13:10:23 浏览次数:
  在输送带应用的整个过程中,很容易出现硫化橡胶层脆化脱落的情况。经过科学研究,导致硫化橡胶脆化的因素如下:
  In the whole process of conveyor belt application, the embrittlement of vulcanized rubber layer is easy to occur. After scientific research, the factors that lead to the embrittlement of vulcanized rubber are as follows:
  1、氧气:氧气在硫化橡胶中通过无机酸的分子结构使硫化橡胶发生连锁反应,使分子结构的链断裂或过多的化学交联,导致硫化橡胶特性的变化。化学作用是造成硫化橡胶脆化的主要原因之一。
  1. Oxygen: in vulcanized rubber, oxygen causes the chain reaction of vulcanized rubber through the molecular structure of inorganic acid, which breaks the chain of molecular structure or leads to excessive chemical crosslinking, leading to the change of vulcanized rubber properties. Chemical action is one of the main causes of embrittlement of vulcanized rubber.
  2、活性氧物种,活性氧物种的有机化学专一性比氧气高得多,破坏性更大,它同样可以打破分子结构链,但活性氧物种对硫化橡胶的影响是不同的,随着硫化橡胶的变形。硫化橡胶(主要为不饱和脂肪硫化橡胶)变形时,存在一种具有地应力作用方向的垂直裂纹,称为“活性氧裂纹”。硫化橡胶变形时,只有表层转化为不开裂的空气氧化膜。
  2. The organic chemical specificity of the active oxygen species is much higher and more destructive than that of the oxygen species. It can also break the molecular structure chain, but the influence of the active oxygen species on the vulcanized rubber is different, with the deformation of the vulcanized rubber. During the deformation of vulcanized rubber (mainly unsaturated fat vulcanized rubber), there is a vertical crack with the direction of in-situ stress, which is called "active oxygen crack". When the vulcanized rubber is deformed, only the surface layer is transformed into an air oxide film without cracking.
  3、加热:温度升高可引起硫化橡胶的催化裂化或热化学交联。但热的基本作用仍然是主动作用。它是一种脆化状态,热氧脆化是一种常见的现象,它增加了氧的扩散速率和活性氧化还原反应,进而加快了硫化橡胶的氧化还原反应速率。
  3. Heating: temperature rise can cause catalytic cracking or thermochemical crosslinking of vulcanized rubber. But the basic function of heat is still active. It is a kind of embrittlement state, and hot oxygen embrittlement is a common phenomenon. It increases the diffusion rate of oxygen and active redox reaction, and then accelerates the redox reaction rate of vulcanized rubber.
  4. 光:微波越小,动能越大。硫化橡胶对紫外线的高动能有破坏作用。紫外光能马上引起硫化橡胶分子链的断裂和化学交联,硫化橡胶由于消化和吸取光而引起的矿物酸基团,引起和加速整个过程的空气氧化链反应。紫外线起暖化作用。光效(与热效率相反)的另一个特点是它是橡胶表面生长的关键。在粘接率高的样品中,会出现双面网状结构的裂纹,即“光学表面裂纹”。
  4. Light: the smaller the microwave, the greater the kinetic energy. Vulcanized rubber has destructive effect on the high kinetic energy of ultraviolet. Ultraviolet light can immediately cause the fracture and chemical cross-linking of the molecular chain of vulcanized rubber, and the mineral acid group caused by the digestion and absorption of light of vulcanized rubber can cause and accelerate the whole process of air oxidation chain reaction. Ultraviolet rays play a warming role. Another characteristic of light efficiency (as opposed to thermal efficiency) is that it is the key to rubber surface growth. In the samples with high adhesion rate, there will be cracks of double-sided network structure, namely "optical surface cracks".
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  5. 机械设备:地应力的整个过程连续传送带之间的摩擦和缓冲的常数地应力下辊机械设备将打破硫化橡胶的分子结构链,将成矿酸组,导致空气氧化的连锁反应,生成有机化学的整个过程。机械设备的整个过程打破了分子结构链和机械设备的活性空气氧化。按照现在的标准,谁能占上风?另外,在应力作用下很容易引起ros开裂。
  5. Mechanical equipment: the whole process of in-situ stress: continuous friction between conveyor belts and constant buffering in-situ stress. The roller mechanical equipment will break the molecular structure chain of vulcanized rubber, lead to the chain reaction of air oxidation, and generate the whole process of organic chemistry. The whole process of mechanical equipment breaks the molecular structure chain and the active air oxidation of mechanical equipment. According to the current standard, who can take the lead? In addition, it is easy to cause ROS cracking under stress.
  6、水:水的效率有两个等级:硫化橡胶在潮湿和冰冷的气体雨中或浸泡在水中,很容易被破坏,它是由于硫化橡胶在水中溶解的化学物质和冷水酯基等成分被水浸融化。由水解、消化或吸取引起的。尤其在气泡渗透和空气暴露的置换作用下,硫化橡胶的破坏速度加快。但在一定情况下,水不会对硫化橡胶造成损伤,甚至有减缓硫化橡胶脆化的作用,效率元素还具有有机化学物质、价态金属离子、源能辐射源、电流和微生物。
  6. Water: there are two levels of water efficiency: vulcanized rubber is easy to be damaged in wet and cold gas rain or immersed in water. It is because the chemical substances dissolved in water and the cold water ester base of vulcanized rubber are melted by water immersion. Caused by hydrolysis, digestion, or absorption. Especially under the replacement of air bubble penetration and air exposure, the failure rate of vulcanized rubber is accelerated. However, under certain conditions, water will not cause damage to vulcanized rubber, and even reduce the embrittlement of vulcanized rubber. Efficiency elements also have organic chemicals, valence metal ions, source energy radiation sources, current and microorganisms.

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