Mechanism of action of viscosity index improvers
Mechanism of action of viscosity index improvers
复制标题
粘度指数改进剂的作用机理
DOI：
10.1016/0301-679x(78)90006-3
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
H. Müller
中科院分区：
文献类型：
--
作者：
H. Müller
使用聚合物添加剂的一个原因是为了获得比可比的纯矿物油具有更好的粘度-温度特性的产品。对添加和不添加聚合物的发动机油的粘温特性的测量表明，有必要对普遍接受的VI改善机制的概念进行修订。通过加入聚合物，轻质油的较好粘温特性可以部分地保持在较高粘度的区域中，然而轻质油对于发动机的润滑价值有限。因此，很明显，如何从聚合物生产多级油是可能的，聚合物线圈的尺寸随着温度的升高而膨胀或收缩。线圈膨胀在一定程度上促进了VI的改善，但这种效果并不起决定性作用
One reason for using polymeric additives is to obtain a product which has better viscosity-temperature characteristics than a comparable pure mineral oil. Measurements of the viscosity-temperature behaviour of motor oils with and without polymer addition show the necessity of a revision of the generally accepted concept of the mechanism of VI improvement. By addition of polymer the better viscosity-temperature characteristics of light oils, which are however of limited value for lubrication of engines, can bemaintained partially in the region of higher viscosities. So it becomes obvious how it is possible to produce multigrade oils from polymers the polymer coil dimensions of which either expand or contract with increasing temperature. Coil expansion promotes VI improvement to some extent, but in no way does this effect play a decisive part