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Complex between the surfactant
Release Date：2013-11-21 Source：admin Views：1343
Present in most useful in detergent formulations, surfactants are used in a variety of active compound to achieve improved performance and reduce costs. The different types of surfactant complex, often achieve more than any one component of a mixture of both good performance, then we call it a synergistic effect occurs (or synergy); But if mismatches (eg species or mixed Select unreasonable proportions) performance deterioration of the situation can also occur.
For mixed surfactant synergies, research work is very active in recent years, both in theory and application are true, and has made considerable progress, the law has been initially got some mixed surfactant system.
The mixing system with one pair of component-based surfactant, wherein the high surface activity, low cmc value ratio of the components in the large mixed micelles, i.e., it is the mole fraction of micelles in solution than their large mole fraction. That is, this is easy to form the surfactant micelles in the solution. Conversely, low surface activity, cmc larger value is difficult to form the surfactant micelles, mixed micelles of relatively small mole fraction.
After the nonionic surfactant to nonionic surfactant, non-ionic cloud point boundary will become insufficient surfactant clear. Cmc value is also proportional with the nonionic surfactant is increased decreased, i.e., the ionic surfactant solution as long as a small amount of nonionic surfactant is present, it can greatly reduce the cmc. This is due to the non-ionic surfactant and ionic surfactant to form mixed micelles in solution. Nonionic surfactant molecule into ionic surfactant micelles, so that the original head of nonionic surfactants repulsion between ions weakened, plus two surfactants hydrophobic interactions asked, easily generates gum group, so that the mixture of cmc decline. Further, when the non-ionic surfactant to ionic surfactant in addition to the above so that the drop in cmc, surface tension decreased surface activity increased. In the vicinity of the cmc, the surface tension of the solution was minimum, the visible effects of non-ionic surfactant solution properties of ionic surfactant is quite fierce. Conversely when the non-ionic surfactant was added ionic surfactant, nonionic surfactant is added to a solution of the ionic surfactant is similar in the case of the solution surface tension reduction, cmc smaller, a surfactant is increased.
Cationic surfactants and anionic surfactants used in combination with each other, interact to form an insoluble precipitate so that it effects cancel each other. Therefore, the anionic surfactant in the wash liquor to increase the effect of sterilization, can not fit into a cationic surface active agent, then must select a non-ionic surfactant, which is daily chemical industry, particularly in the detergent industry a common rule. However, under appropriate conditions, the positive ions can also be mixed surfactant precipitate is not generated, and the surfactant mixture is greatly improved. As long as the volume of the anionic surfactant ion and cationic surfactant negative surfactant surface-active ions being too small, it will not lose its effectiveness mixture was precipitated in the solution, a surfactant can be obtained than a single surfactant higher mixtures.
Not only such positive and negative surface active agents exhibit a molar mixture of high surface activity, and non-equimolar mixtures also show a high ratio of surfactant. Positive and negative ion surfactant mixture of high surface activity is not only reflected in the low cmc and low surface tension, and this mixture has good wetting properties, permeability, stable foam and a series of surface and colloid chemistry.
Positive and negative ions root cause of the surfactant mixture of surfactants to improve is that the role of electrostatic attraction of opposite electrical surfactant ions, greatly increases the aggregation of two surface-active ions. And compared to a single surfactant, it does not have the same ionic repulsion between the single-surface-active ions, and therefore easily adsorbed at the interface surface, a more compact than a single hydrocarbon chain surfactant surface layer, strongly polar higher surface energy is changed to be close to the water surface of the non-polar hydrocarbon to low energy surfaces, thereby changing the properties of the water surface.
It must be noted that not all types of positive and negative ions surfactant (Cm + NMe3 a CnS-) are mixed with the above specific performance only when lipophilic groups in the number of carbon atoms are more, but only approximately equal number of carbon atoms There are these special performance.
For mixed surfactant synergies, research work is very active in recent years, both in theory and application are true, and has made considerable progress, the law has been initially got some mixed surfactant system.
The mixing system with one pair of component-based surfactant, wherein the high surface activity, low cmc value ratio of the components in the large mixed micelles, i.e., it is the mole fraction of micelles in solution than their large mole fraction. That is, this is easy to form the surfactant micelles in the solution. Conversely, low surface activity, cmc larger value is difficult to form the surfactant micelles, mixed micelles of relatively small mole fraction.
After the nonionic surfactant to nonionic surfactant, non-ionic cloud point boundary will become insufficient surfactant clear. Cmc value is also proportional with the nonionic surfactant is increased decreased, i.e., the ionic surfactant solution as long as a small amount of nonionic surfactant is present, it can greatly reduce the cmc. This is due to the non-ionic surfactant and ionic surfactant to form mixed micelles in solution. Nonionic surfactant molecule into ionic surfactant micelles, so that the original head of nonionic surfactants repulsion between ions weakened, plus two surfactants hydrophobic interactions asked, easily generates gum group, so that the mixture of cmc decline. Further, when the non-ionic surfactant to ionic surfactant in addition to the above so that the drop in cmc, surface tension decreased surface activity increased. In the vicinity of the cmc, the surface tension of the solution was minimum, the visible effects of non-ionic surfactant solution properties of ionic surfactant is quite fierce. Conversely when the non-ionic surfactant was added ionic surfactant, nonionic surfactant is added to a solution of the ionic surfactant is similar in the case of the solution surface tension reduction, cmc smaller, a surfactant is increased.
Cationic surfactants and anionic surfactants used in combination with each other, interact to form an insoluble precipitate so that it effects cancel each other. Therefore, the anionic surfactant in the wash liquor to increase the effect of sterilization, can not fit into a cationic surface active agent, then must select a non-ionic surfactant, which is daily chemical industry, particularly in the detergent industry a common rule. However, under appropriate conditions, the positive ions can also be mixed surfactant precipitate is not generated, and the surfactant mixture is greatly improved. As long as the volume of the anionic surfactant ion and cationic surfactant negative surfactant surface-active ions being too small, it will not lose its effectiveness mixture was precipitated in the solution, a surfactant can be obtained than a single surfactant higher mixtures.
Not only such positive and negative surface active agents exhibit a molar mixture of high surface activity, and non-equimolar mixtures also show a high ratio of surfactant. Positive and negative ion surfactant mixture of high surface activity is not only reflected in the low cmc and low surface tension, and this mixture has good wetting properties, permeability, stable foam and a series of surface and colloid chemistry.
Positive and negative ions root cause of the surfactant mixture of surfactants to improve is that the role of electrostatic attraction of opposite electrical surfactant ions, greatly increases the aggregation of two surface-active ions. And compared to a single surfactant, it does not have the same ionic repulsion between the single-surface-active ions, and therefore easily adsorbed at the interface surface, a more compact than a single hydrocarbon chain surfactant surface layer, strongly polar higher surface energy is changed to be close to the water surface of the non-polar hydrocarbon to low energy surfaces, thereby changing the properties of the water surface.
It must be noted that not all types of positive and negative ions surfactant (Cm + NMe3 a CnS-) are mixed with the above specific performance only when lipophilic groups in the number of carbon atoms are more, but only approximately equal number of carbon atoms There are these special performance.