How to choose asphalt emulsifier

Introduction: asphalt emulsifier is a type of surfactant Its chemical structure is composed of lipophilic group and hydrophilic group It can be adsorbed on the interface between asphalt particles and water, thus significantly reducing the free energy of the interface between asphalt and water, so that it can form a kind of surfactant with uniform and stable emulsion So how to choose the asphalt emulsifier? Let's take a look at it together with the small weaving Asphalt emulsifier is a surfactant which can be used in asphalt emulsification When a small amount of water is added, the surface tension of water can be greatly reduced, and the interface property and state of the system can be changed obviously, thus a series of functions such as wetting, emulsifying, foaming, washing, dispersing, antistatic, lubricating and solubilizing can be produced, so as to meet the requirements of practical application So how to choose asphalt emulsifier? Let's learn about it together with the small safety net of Baibai When choosing asphalt emulsifier, the following aspects are mainly considered: 1 Potential value: the performance of asphalt emulsion made by various emulsifiers, and the detection of zeta potential is of great significance Because the greater the zeta potential value, the greater the repulsive force between the emulsified asphalt particles, the better the stability of the emulsion, and the stronger ionic charge on the asphalt particles, and the greater adhesion to aggregate 2 HLB value: the emulsifier must have strong emulsifying ability, and the evaluation standard of this emulsifying ability is the HLB value of emulsifier It represents the balance relationship between the size and strength of the lipophilic base and the hydrophilic base of emulsifier 3 Selection according to the splitting speed: in asphalt pavement, due to the needs of construction performance, many special requirements are put forward for emulsified asphalt 4 Ion characteristics: emulsifier can be divided into cationic, anionic and non-ionic emulsifiers according to charge In road construction, emulsifier should be adjusted due to different types of aggregate selected Due to the high content of silica, low content of calcium carbonate and good acid resistance, andesite and diabase are generally with negative charge, so cationic emulsifier is selected The produced emulsified asphalt has good adhesion to aggregate 5 The molecular structure of emulsifier: the hydrocarbon chain and its branch chain of emulsifier's lipophilic base directly affect the ability of lipophilic base's affinity to asphalt 6 According to the characteristics of asphalt composition, the composition of asphalt materials is different, and the requirements for emulsified asphalt are also different Each emulsifier is the most effective for a certain type of asphalt 7 The toxicity of emulsifier is the introduction of how to choose asphalt emulsifier If you need to know more about emulsifier and other safety knowledge, please continue to pay attention to the general knowledge column of food additives in Baibai safety net Editor in charge: Wang Xiaoli