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導致硫化橡膠脆化的因素有哪些?

來源:http://www.bevness.com 時間:2020-05-18 13:10:23 瀏覽次數:
  在輸送帶應用的整個過程中,很容易出現硫化橡膠層脆化脫落的情況。經過科學研究,導致硫化橡膠脆化的因素如下:
  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、氧氣:氧氣在硫化橡膠中通過無機酸的分子結構使硫化橡膠發生連鎖反應,使分子結構的鏈斷裂或過多的化學交聯,導致硫化橡膠特性的變化。化學作用是造成硫化橡膠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、活性氧物種,活性氧物種的有機化學專一性比氧氣高得多,破壞性更大,它同樣可以打破分子結構鏈,但活性氧物種對硫化橡膠的影響是不同的,隨著硫化橡膠的變形。硫化橡膠(主要為不飽和脂肪硫化橡膠)變形時,存在一種具有地應力作用方向的垂直裂紋,稱為“活性氧裂紋”。硫化橡膠變形時,隻有表層轉化為不開裂的空氣氧化膜。
  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、加熱:溫度升高可引起硫化橡膠的催化裂化或熱化學交聯。但熱的基本作用仍然是主動作用。它是一種脆化狀態,熱氧脆化是一種常見的現象,它增加了氧的擴散速率和活性氧化還原反應,進而加快了硫化橡膠的氧化還原反應速率。
  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,動能越大。硫化橡膠對紫外線的高動能有破壞作用。紫外光能立即引起硫化橡膠分子鏈的斷裂和化學交聯,硫化橡膠由於消化和吸收光而引起的礦物酸基團,引起和加速整個過程的空氣氧化鏈反應。紫外線起暖化作用。光效(與熱效率相反)的另一個特點是它是橡膠表麵生長的關鍵。在粘接率高的樣品中,會出現雙麵網狀結構的裂紋,即“光學表麵裂紋”。
  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. 機械設備:地應力的整個過程連續傳送帶之間的摩擦和緩衝的常數地應力下輥機械設備將打破硫化橡膠的分子結構鏈,將成礦酸組,導致空氣氧化的連鎖反應,生成有機化學的整個過程。機械設備的整個過程打破了分子結構鏈和機械設備的活性空氣氧化。按照現在的標準,誰能占上風?另外,在應力作用下很容易引起ros開裂。
  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:水的效率有兩個等級:硫化橡膠在潮濕和寒冷的氣體雨中或浸泡在水中,很容易被破壞,它是由於硫化橡膠在水中溶解的化學物質和冷水酯基等成分被水浸融化。由水解、消化或吸收引起的。尤其在氣泡滲透和空氣暴露的置換作用下,硫化橡膠的破壞速度加快。但在一定情況下,水不會對硫化橡膠造成損傷,甚至有減緩硫化橡膠脆化的作用,效率元素還具有有機化學物質、價態金屬離子、源能輻射源、電流和微生物。
  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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