Why does the degreasing tank clump when it is cold is alkaline degreasing

According to the phenomenon you described, it is explained that the concentration of the degreaser in the degreaser tank is too high, and crystallization occurs at low temperatures.

Normally, degreasers do not crystallize. You're using powdered degreasers, right?

In powdered degreasers, there is a substance that is used to reduce costs, it has no effect on degreasing, only to increase the weight of the degreaser. When used in the factory, due to the degreasing effect, it is necessary to continuously add degreasing agents. If the degreaser is added, it will naturally precipitate out of the degreasing tank in the form of precipitation.

It is recommended that you use a high-quality degreaser.

The core masterbatch of universal degreaser.

Powder formula: universal degreaser core masterbatch + sodium silicate = universal degreasing powder.

Water agent formula: universal degreaser core masterbatch + flavor + preservative + water + pigment = universal degreaser.

1. Special advantages:

1. Strongly dissolve and clean inorganic oil; Lubricating oil, mechanical oil, mineral oil, clutch oil, gear oil, brake oil, engine oil, ink, release oil, compressor oil, refrigeration oil, vacuum pump oil, internal combustion engine oil, bearing oil, guide rail oil, hydraulic oil, hydraulic transmission oil, metalworking oil, electrical insulating oil, power tool oil, heat conduction oil, anti-rust oil, oil for special occasions, steam turbine oil, quenching oil, fuel oil and other inorganic oils.

2. Strong dissolution and cleaning of organic oils: vegetable oil, animal oil, edible oil and other organic oils.

3. It can be used to produce two types of products: direct injection and cleaning.

1. The core masterbatch of universal degreaser is 2-5 kg.

2. Appropriate amount of flavor and pigment.

3. Appropriate amount of preservatives.

4. Water 95--98 kg.

2) Powder formula:

1. The core masterbatch of universal degreaser is 2-5 kg.

2. Sodium silicate 95-98 kg.

Third, the production process:

1. The production process of water agent formula: add the core masterbatch, flavor, pigment and preservative of universal degreaser to the water and stir evenly. If you need to produce a direct injection type, you can add tetrahydrofurfuryl alcohol by yourself.

2. Powder formula production process: stir the core masterbatch of universal degreaser and sodium silicate evenly.

Alkaline degreasing, alkali will saponify with grease to produce saponification.

At lower temperatures, the saponification solidifies and agglomerates.

It is recommended that you use organic solvents such as diesel degreasers, which may be more effective.

The distinction between the three: the pH test paper is widely used to test the acidity and alkalinity of the degreaser. If the pH value is greater than 9, it can be regarded as an alkaline degreaser; If the pH value is less than 5, it can be regarded as an acid degreaser; A pH between 5 and 9 can be considered a neutral degreaser.

The difference between the three: the composition of alkaline degreasers generally contains caustic soda or salts that produce hydroxide by hydrolysis. The composition of acid degreasers generally contains inorganic acids or organic acids, and in general, the pH value of degreasers containing organic acids is higher.

Neutral degreasers generally contain alkaline metal salts such as sodium bicarbonate.

Similarities: The main purpose of all three is to remove oil, so they all contain surfactants. Of course, different formulations contain different types and amounts of surfactants.

Use: In general, when the oil stain on the surface of the workpiece is heavy or difficult to clean, it is best to use alkaline degreaser. However, when degreasing non-ferrous metals, it is necessary to pay attention to the corrosion of the metal by the degreaser.

Acid degreasers have the weakest degreasing ability and are generally not suitable for cold plates, but they are more suitable for hot rolled plates. The degreasing power of neutral degreasers is somewhere in between. It should be noted that the bacteria in the neutral degreaser are easy to multiply, and the degreaser will become smelly after a period of use, which will seriously affect the degreasing effect.

All three are beneficial for degreasing when heated.

There is a gray film on the surface of the substrate after degreasing, which is caused by two reasons:

The degreaser is not suitable and of poor quality. After degreasing, the surface of the substrate is rubbed with black ash, but the oil stain has been removed.

Poor quality steel (high carbon content, etc.). After degreasing, the surface of the substrate is rubbed with black ash, but the oil stain has been removed.

Solution: If it is the first reason, please replace the degreaser of ***; If it is the second reason, it is necessary to set up an ash removal process after degreasing and washing in the pre-treatment, and the ash remover can be added to the process.

First of all, we need to figure out what "this yellow thick" is.

The yellow thick is oily.

If it is an oil stain, it can be salvaged. If you have an automatic oil-water separator, the oil will be separated automatically. But based on your situation, it is estimated that there is no oil-water separator.

How can you tell if it's oil? If your degreasing temperature is below 50 degrees and there is still a yellow substance floating on the degreasing solution, it means that it is oil, otherwise it is not oil.

Yellow thick is not oily.

Some degreasers are poorly formulated or use poor quality surfactants.

When the degreasing temperature is lower than 55 degrees, the cloud point of the surfactant is still reached, so that the surfactant precipitates. But when the temperature drops, the surfactant disappears again. In this case, if it is soaked and degreased, it will have a great impact; If it is spray degreasing, the impact is less.

If the degreasing temperature is higher than 55 degrees, and a yellow thick matter appears at this time, it is generally not a degreaser quality problem, mainly caused by your operating temperature being too high. If the degreasing effect is not good when the temperature is low and you have to use a higher temperature, it is not necessarily a problem with the quality of the degreaser, and it may not be the auxiliary facilities for degreasing (circulating the inlet liquid, shaking the workpiece, spraying out the slot, etc.). If you have any auxiliary facilities, please change the degreaser.

Alkaline degreasing sodium carbonate is the most economical and easy to use. Sodium hydroxide is alkaline and corrosive, so you should pay attention when eating.

Alkaline degreasing additives.

Easy 829 Full Member4

1st floor. 1. Functions.

1. This product is a colorless to light yellow viscous liquid, soluble in water, non-toxic, non-corrosive, non-polluting, non-flammable, non-explosive, pH value of 9.

2. The surface treatment industry widely uses a strong alkaline degreaser to heat up to 90-100 to remove the oil stain on the surface of the workpiece, this method has a series of weaknesses such as large alkaline mist, poor working conditions, low efficiency of removing mineral oil, high energy consumption, etc., and the effective way to improve the shortcomings of alkaline degreasing is to add HH982 alkaline degreasing additive.

3. This agent is composed of a variety of alkali-resistant and temperature-resistant surfactants, which can emulsify mineral oil, increase permeability, and have the effect of inhibiting fog and corrosion, and greatly improving the performance of alkaline degreasers.

Second, the formula. Sodium hydroxide: 20-30 grams liters.

Sodium carbonate: 30-40 grams liters.

Trisodium phosphate: 30-40 grams liters.

HH982: 20-50 g liters.

Temperature: 70-90 or 60-70

3. Preparation method.

Add the calculated amount of clean water to the alkaline degreasing tank, add three kinds of alkali, and after it is completely dissolved, add HH982 and stir evenly.

Fourth, the use of methods and precautions.

1. For lye solution with HH982 additives, the degreasing temperature can be appropriately reduced by 10-20;

2. If the emulsification effect is reduced and the foam of the solution is reduced, HH982 additives can be added.

3. The storage period of this product is one year.

It is mainly alkaline inorganic salts, such as sodium hydroxide, trisodium phosphate, sodium metasilicate, in addition, it is a surfactant, which is generally non-ionic HLB of about 14, such as OP-10, AEO9, etc.

Food alkali is called soda ash in chemistry textbooks, and its chemical formula is: Na2CO3; The hydrolysis formula of Na2CO3 added to water is:

na2co3+h2o=2naoh+co2.

CO2 is what we often call carbon dioxide, which is in the form of a gas that will overflow the water after accumulation; NaOH (sodium hydroxide) is a strong alkali (commonly known as caustic soda) with strong oxidizing properties and can quickly decompose oils and fats. Therefore, its ability to decontaminate is very strong. When edible alkali is dissolved in water, it is an exothermic reaction, and even if you don't use hot water, the water temperature will be higher than before.

However, it is now winter, and the effect of temperature rise caused by chemical reactions is not obvious.

If you are in direct contact with alkaline water by hand, be careful not to have too high a concentration of alkali, otherwise it will burn**.

Reasons:1Oils (also known as oils) are esters formed by higher fatty acids and glycerol.

Yes esters can be hydrolyzed under alkaline to form carboxylate sodium salts and alcohols. 2.Soda (sodium carbonate) hydrolysis is alkaline 3

The soda is alkaline, which hydrolyzes the oil to produce water-soluble salts and alcohols, and the insoluble oil can be removed with the water.

If too much caustic soda is used, it may cause the oil to form sodium stearate (slightly soluble in water).

This one can give you help you out.