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Introduction to the formula of alkaline oil remover

Views: 0     Author: Site Editor     Publish Time: 2024-04-09      Origin: Site





First, the composition of alkaline degreasing agent

Degreasing agent is generally composed of two parts: washing aid and surfactant.

The proportion of washing aid is the largest in the oil removal agent, but it does not play a decisive role in mineral oil, and the main role is surfactants.

The selection of surfactants mainly considers its adsorption, permeability, wettability, emulsification, dispersibility, etc., and determines according to the relationship between its physical properties and the detergency of low mixing. Usually a surfactant can not have the above properties at the same time, so according to the measured results of surfactants, a variety of active agents should be selected to achieve the required physical properties and decontamination effect. For straight chain surfactants (e.g. RCOONa, ROSO3Na, RSO3Na, etc.) The surface activity increases with the increase of carbon chain, the hydrophobic group in C8~C12: shows a better wetting effect,C12~C16 shows a better deconfouling effect, the water solubility above C18 is poor, the hydrophobic group in the ortho-position of alkane benzene, the permeability is large, the para-position, the solubilization effect is large. The hydrophilic group is located at the end of the hydrophobic group, which is better than the emulsification and solubilization near the middle, and should be used as emulsifier and detergent. The permeability of hydrophilic group near the middle of hydrophobic group is better than that at the end, and it should be used as wetting agent and penetrant. The wettability of hydrophilic group and hydrophobic group becomes worse when the positions of hydrophilic group and hydrophobic group on benzene ring are adjacent, middle and para-position respectively.

The permeability of surfactants with branched hydrophobic groups is better than that without branched hydrophobic groups, but because of the spatial position of branched hydrophobic groups, the arrangement of adsorption layers at the interface is not as tight as that of straight chains, which affects the deterrence. The balance between the hydrophobic and hydrophilic groups of non-ionic surfactants should also be considered, such as C10~C18 polyoxyethylene aliphatic alcohol ether, polyoxyethylene chain needs to account for more than 2/3 of the molecular weight, water solubility is good, but the polyoxyethylene chain is too large, will reduce the interface adsorption and deconfouling performance, in general, polyoxyethylene ether molecular weight is large, foam is small, and permeability variance. According to the principle of similar solubility, the more similar the hydrophobic group in the surfactant is to the gene being acted on, the better the affinity between them. For example, when emulsifying mineral oil, it is appropriate to use aliphatic or hydrophobic surfactants with lipid chain aromatics.

Non-ionic surfactants are relatively stable in acid and alkali media, good compatibility with other types of surfactants, good solubility in various solvents, strong ability to emulsify grease, and good lubrication and dispersion properties. It does not adsorb on the metal surface, has good cleaning performance and less residual liquid. Nonylphenol-like polyoxyethylene ether nonionic surfactants have good wetting and emulsifying and solubilizing properties. The charged groups of anionic surfactants are easily adsorbed on the metal surface and can also be adsorbed on the surface of dirt, so that the groups with the same charge repel each other, resulting in reduced adhesion and conducive to the removal of dirt.

Four, five kinds of alkaline cleaning agent formula

Recipe 1

Degreasing cleaner

Alkali metal hydroxide 80.0-160.0g hydrazine 20.0-L00.0g glycine 40.0-L00.0g

Thiourea, sodium thiosulfate or sodium sulfide 0.2-l.0g Trilone B10-50:10.0-50.0 g water added to 1 000. 0mL

Description Glycine, thiourea and sodium thiosulfate can accelerate the etching process, alkali metal hydroxide can increase the alkalinity of the cleaning solution, and play the role of degreasing at the same time.

Recipe 2

Alkaline cleaning solution suitable for immersion method

Sodium hydroxide 20g sodium carbonate 18g

Sodium tripolyphosphate 20g anhydrous sodium metasilicate 30g sodium resinate 5g

Sodium alkyl aryl sulfonate 5g alkyl aryl polyol ether 2g

Description The temperature is 70-100 ℃, the cleaning time is 3-5min, and the concentration is 25-50g/L. Cold water washing temperature is room temperature, time is 0.25-0.5 min; The hot water washing temperature is 70-90C, and the time is 2min. The drying temperature of hot air is 70-104 ℃, and the time is 1-3min.

Recipe 3

Cleaning agent for metal surface

Disodium ethylenediamine tetraacetate 0.5% - 2.5% acetone or ethanol 16.0%-1032.0% ammonia water 0.5% -5.0%

Chemical cleaning enhancer 0.1% -0.5% water added to l00%

Description This formula is a cleaning agent for metal surfaces.

Recipe 4

Cleaning agent for metal surfaces

Sodium metasilicate 2.50%-3.00% Sodium carbonate 0.80%-1.00%

C10-16 synthesis fatty acid monoethanolamide polyoxyethylene ether 0.15%-0.20% Cl0-16 synthesis fatty alcohol polyoxyethylene ether 0.20%-0.30% water added to 100%

Description This formula is suitable for cleaning metal surfaces.

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