Relationship between chemical structure and application properties of surfactants

Relationship between chemical structure and application properties of surfactants
1. Relationship between hydrophilic-hydrophobic equilibrium value and performance
H-L-B value: indicates the hydrophilic and hydrophobic properties of surfactants.
In order for surfactants to exhibit unique interfacial activity, there must be a certain balance between hydrophobic and hydrophilic groups.

The HLB value can be used as a reference for selecting surfactants. However, it is not possible to determine or select surfactants solely on the basis of HLB value.
2. Lipophilic and hydrophilic groups
The order of lipophilic group is perfluoroalkyl; olefinic group; aromatic group with aliphatic chain; aromatic hydrocarbon; polyoxypropylene group. This order is only correct when the relative molecular mass or the number of carbon atoms is the same as that of the hydrophilic group.
Generally the order of strength of hydrophilic groups is: sulfate group; sulfonic acid group; quaternary amine group; phosphate group; carboxylic acid group; hydroxyl group; ether group. It varies depending on various conditions, among which the effect on the hydrophilicity of hydrophilic groups is temperature. The stronger the hydrophilic group is, the more favorable it is for solubility. Generally, the solubility of ionic surfactants increases with the increase of temperature.

3. Molecular weight
Under the same premise of HLB value, hydrophilic group and hydrophobic group, if the molecular weight is small, the wetting effect is good and the detergency is poor; if the molecular weight is large, the wetting effect is poor and the detergency is good.
Generally speaking, the use of various surfactants should slightly exceed the critical micelle concentration of the surfactant in order to give full play to its effect.

4.Turbidity point
For nonionic surfactants, hydrophilicity depends on the number of ether bonds, the combination of ether and water molecules is an exothermic reaction.
When the temperature rises, the water molecules gradually detach from the ether bond, and the phenomenon of turbidity, just when the turbidity of the temperature called turbidity point. At this point the surfactant loses its effect. The higher the turbidity point, the wider the temperature range.
Long-term use of the air conditioning filter, easy to accumulate dust, bacteria and other pollutants. These hidden “little guys” will not only affect the cooling effect of the air conditioner, but also may pose a threat to your health and the health of others.
In order to ensure that you can enjoy a fresh, comfortable air conditioning environment in the summer, the Property Service Center has launched a special air conditioning filter cleaning work.
Removal and Installation of Air Conditioner Filter
Split Hanging Unit
Step 1: Lift the panel at an angle with both hands from both ends of the panel in the direction of the arrows;
Step 2: Hold the panel with one hand and push the air filter out of the slot with the other hand to remove it;
Step 3: Remove the health filter from the air filter in the direction of the arrow; the health filter can be installed by following the opposite steps.
Square Cabinet Unit
Step 1: Remove the screws of the air inlet grille, open the screw covers on the left and right sides as shown in the picture above; use a screwdriver to remove the screws on the left and right sides of the air inlet grille;
Step 2: Open the air inlet panel, the filter can be removed in the direction shown in the figure ②, open the air inlet panel, and then pull the filter in the direction ③.
– Filter installation can be done by following the opposite steps
Round Cabinet Unit
A
Gree iCool, iPlatinum, iMu, iShang and other similarly structured round cabinet units.
① Turn on the power and make the air conditioner in the off state;
② Select the cleaning function and press ▲ or ▼ to confirm, at this time the shell starts to rotate automatically, after the shell stops rotating;
① Turn on the power and make the air conditioner turn off;
④ Unscrew the screws for fixing the filter, break the two clips, and pull out the filter in the direction of the arrow (the filter can be installed by following the opposite steps).
B
Gree i Chang, i Enjoy, Cloud Platinum, Cloud Cool and other similarly structured round cabinet units.
① Disconnect the power supply;
② Hold the notch on the right side of the inlet grille at the back of the air conditioner and pull out the upper and lower filters in the direction of the arrow;
Remove the health filter from the air filter in the direction of the arrow;
③ Remove the health filter from the air filter in the direction of the arrow; ④ Install the blue mesh of the health filter close to the air filter.
02
Part 2
Air conditioner filter cleaning
Air filter cleaning
Clean the air filter by gently tapping or using a power vacuum cleaner. When the filter is dirty (e.g. oil), wash it with warm water (below 45℃) with neutral detergent, and then leave it in a cool place to dry. Do not dry it on the fire to avoid the air filter catching on fire or being deformed.

Translated with DeepL.com (free version)