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导致输送带老化龟裂直接的三种原因?

来源:http://www.huafengxiangsu.com 时间:2019-04-19 13:26:17 浏览次数:
1、假如一种抗氧剂既具有终止活性自在基的功用又具有合成过氧化氢物的功用,也会产生协同效应,这种协同效应称为自协同效应,某些长效性抗氧剂,因分子中含有两种不同的功用基团而具有这种特征;
1. If an antioxidant has the function of both terminating activity and synthesizing hydrogen peroxide, it will also produce synergistic effect. This synergistic effect is called self-synergistic effect. Some long-acting antioxidants have this characteristic because they contain two different functional groups in the molecule.
2、臭氧是招致橡胶在大气中发作老化的一个重要要素,臭氧比氧更生动,因此它对保送带特别是不饱和橡胶的侵袭比氧严重得多,大气中的臭氧是由氧分子吸收太阳光中的短波紫外光后,合成出的氧原子重新与氧分子分离而成的,随着空气的垂直活动,臭氧被带到地球外表,臭氧的浓度由高空到空中逐步降低。另外,在紫外光集中的场所、放电场所以及电动机左近,特别是产生电火花的中央都会产生臭氧,地域不同,臭氧的浓度不同,时节不同,臭氧的浓度也不同,固然空中左近的臭氧浓度很低,但对橡胶形成的危害却是不容无视的;
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2. Ozone is an important factor that causes rubber aging in the atmosphere. Ozone is more vivid than oxygen. Therefore, it attacked the conveyor belt, especially unsaturated rubber, much more seriously than oxygen. Ozone in the atmosphere is formed by oxygen molecules absorbed short-wave ultraviolet light from the sun, and the synthesized oxygen atoms are separated from oxygen molecules. With the vertical movement of air, ozone is brought to the conveyor belt. Outside the earth, ozone concentration gradually decreases from high altitude to high altitude. In addition, ozone can be produced in the places where ultraviolet light is concentrated, discharge places and motor are near, especially in the center where electric sparks are produced. The concentration of ozone varies from region to region, from time to time, and from time to time. Although the concentration of ozone in the left and near air is very low, the harm to rubber formation can not be ignored.
3、不饱和橡胶极易发作臭氧化及其臭氧化后的外观特征,与热氧老化不同,一是橡胶的臭氧化只在臭氧所接触的外表层停止,整个臭氧化过程是由表及里的过程,二是橡胶与臭氧反响生成一层雪白色硬膜,在静态条件下此膜能阻止臭氧与橡胶深层接触,但在动态应变条件下或在静态拉伸状态下当橡胶的伸长或拉伸应力超越它的临界伸长或临界应力时,这层膜会产生龟裂,使臭氧得以与新的橡胶外表接触,继续发作臭氧化反响并使裂纹增长,另外裂纹呈现后由于基部有应力集中,所以更容易加深裂纹进而构成裂口,裂纹的方向垂直于应力方向,普通在小应变下只要少量裂纹呈现,裂纹方向明晰可辨。
3. Unsaturated rubber is very vulnerable to ozonation and its appearance after ozonation. Unlike thermal oxygen aging, the ozonation of rubber stops only in the outer layer of ozone contact. The whole ozonation process is a surface-to-interior process. The reaction between rubber and ozone produces a snow-white hard film, which can prevent ozone from contacting with rubber in deep layer under static conditions, but in dynamic response. When the elongation or tensile stress of rubber exceeds its critical elongation or stress under variable or static tension conditions, the film will crack, which will make ozone contact with the new rubber surface, continue to generate ozonation reaction and crack growth. In addition, the crack will be more prone to deepen the crack and then form the crack direction because of the stress concentration at the base. The direction of crack is perpendicular to the stress direction. In general, the direction of crack can be clearly distinguished if only a few cracks appear under small strain.
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