How to use special defoamer for dyes?

The dye defoamer can be added directly to the foaming stage or mixed evenly with other powdered additives. The dosage is generally the total foaming system, and the specific dosage should be obtained after the actual test.

The defoamer is added directly to the foaming system to ensure that it is evenly dispersed. If diluted, do not store the dilution for more than 8 hours. For the system with a high foaming temperature (>60), it is recommended to add it to the system before 60 and disperse evenly to exert its maximum effectiveness.

According to the viscosity, temperature and stirring of different foaming systems, the more economical dosage is selected in units of 10ppm, and generally speaking, the dosage of 30-200ppm can ensure the ideal defoaming effect.

The dye special defoamer is added in two steps, the first step is added in the middle of product synthesis, which can make the dye special defoamer react with the stock solution to inhibit the foam in the reaction process, and the second step is added in the later stage of the reaction. The phased addition of dye-specific defoamers allows for better performance and reduces the amount added.

The special defoamer for dyes is made of silicone polyether composite and refined with a special process. Foam inhibition and defoaming under high temperature and strong alkali conditions. Yuheng Chemical's dye special defoamer addition amount is 0 1 of the total volume, but the most economical amount should be determined after the process test; It can also be mixed evenly with other powdered additives.

Before use, pick the color you want to use, then mix the hair dye in a scramble container and use it within an hour of mixing.

After mixing, put on gloves and squeeze the foam hair dye onto the palm of your hand, then apply the foam hair dye evenly to dry hair and rub it with your hands. Once you've finished applying, wait 20 minutes, rinse off with water, and finish with shampoo and conditioner again. It is recommended to blow dry your hair if it is wet before using foaming hair dye, as dry hair is more effective.

1.When the textile printing and dyeing defoamer is used for the first time, a small amount of testing is carried out first, and this inspection process can test its specific performance indicators, and can also test whether it is suitable for the company's application;

2.After that, in order to ensure its uniform dispersion, in order to give full play to the continuous defoaming ability of the defoamer, it is recommended to use a metering pump to continuously add dropwise or spray the water surface with a nozzle;

3.According to the instructions given by the manufacturer, add according to the standard proportion.

1.Factors to consider when selecting a defoamer.

In the actual operation of printing and dyeing, we often encounter too much foam, forming a phenomenon of entanglement, blockage or cloth not leaving, and at this time, we must add defoamer to solve the problem. Defoamers are acid-resistant, alkali-resistant, and high-temperature resistant, and both contain silicone oil.

If it is not used reasonably, it will cause emulsion breakage and form silicone oil.

Therefore, we should be careful when using, the amount of defoamer will not achieve the effect, and the amount of defoamer will cause pollution, so choose an optimal amount. Since the more silicone oil is used, the more it will contaminate the fabric and increase the cost, so we recommend using it as little as possible. During operation, the defoamer should be fully diluted with a large amount of water and filtered into the tank.

Only when used correctly can the quality be guaranteed and oil spots avoided.

Thousands of chemicals are available as defoamers, either alone or in combination. Therefore, before choosing a defoamer, you should seek the advice of the manufacturer. When selecting a defoamer, a variety of variables should also be considered, including regulatory requirements, product effectiveness, production costs, and business services.

Defoamer products should be reasonably formulated, and in addition to foam inhibition, the impact on the product should be reduced as much as possible in the use environment. In general, the smaller the amount of defoamer, the lower the impact on the product.

2.Reasonably diluted silicone defoamer.

Silicone defoamers generally need to be diluted when used. Add warm water step by step, stirring thoroughly to avoid the presence of unevenly distributed lumps. If the hardness of the water is high, it can lead to uneven dilution or agglomeration of emulsions, both of which can cause silicone oil to settle on fabrics or mechanical parts.

The addition of cellulose thickener-type thickener system stabilizes the diluted defoamer emulsion. If the diluted product has been left for too long, a biocide should also be added to prevent rancid deterioration, especially in the season when the temperature is high.

3.Avoid silicone oil from forming spots on the fabric or depositing on the device.

First, a production trial and a laboratory trial should be conducted to determine the minimum amount of defoamer required to effectively inhibit foam. Overdoses must be avoided in order to achieve low cost and high performance.

Secondly, good process conditions such as temperature, pH, concentration of other raw materials and electrolytes, and shear force should be ensured. The stability of the defoamer system should be tested in the laboratory under the above conditions before it is put into production. Even after dilution, the defoamer cannot be added directly to the thermal process.

In textile processing. Defoamers can be used in all processes. When weaving and finishing, weaving and sizing ordinary fabrics need to be sized.

According to different fiber varieties, the slurry mainly includes starch, carboxymethyl cellulose, methylcellulose polyvinyl alcohol, polyvinyl acetate, acrylate and sodium alginate. These polymer substances are prone to foam in the slurry, which affects penetration and makes the slurry uneven. In weaving and sizing, low foaming or no foaming is required, and there are many defoamers, especially acrylic synthetic chemical slurries used for chemical fibers and silks, which contain emulsifiers and are easy to foam.

The characteristics of defoamers are:

1. Fast defoaming speed and good foam inhibition performance.

2. It does not affect the basic performance of the foaming system.

3. High diffusion rate and good permeability.

4. Chemically stable.

5。No physiological activity, no corrosion, no toxicity, no defects, no combustion, no **, high safety.

Defoamers are used in textile printing and dyeing, and have two properties: foam breaking and foam inhibition. Some defoamers can only temporarily break the foam and lose their function after dissolving into a liquid. The ideal defoamer requires both defoaming effect and defoaming effect, low solubility in water, and is not easy to be emulsified and dissolved by working liquid.

When a defoamer is added to a working solution, it becomes a solution, emulsion, or dispersion that adsorbs on the surface of the foam film. Because its surface tension is lower than that of bubble film, it can attract surfactants or foaming materials to pull the surface viscosity of the foam liquid film lower, and locally thin and crack. Generally speaking, textile printing and dyeing defoamers can be divided into organic defoamers and polysiloxane defoamers (commonly known as silicone defoamers).

Organic defoamer - a low surface tension liquid that is insoluble in water. The concentration of this defoamer is relatively large, and the defoaming effect is often not long-lasting.

Polysiloxane defoamer - polydimethylsiloxane consists of molecular weight; In addition to the above six advantages, the low concentration of these defoamers is another feature that can exert a good and long-lasting defoaming effect when the solution content is 1-60p pm, so it is particularly suitable for the high-temperature, high-pressure jet overflow dyeing industry, dyeing under high temperature and vigorous agitation.

Silicone defoamer with polysiloxane as the main raw material: six kinds of pure silicone oil, silicone oil solution, silicone oil slurry, silicone oil emulsion, powder and bulk. Defoamers can be divided into the following according to the dosage form:

Solution, latex, powder, paste, lumpy. Defoamers can be divided into: food, pharmaceutical, fermentation, papermaking, printing and dyeing auxiliaries, petroleum exploitation, storage and transportation, refining, lubricating oil, chemical production, metal cutting fluids, chemical cleaning, water treatment and other cracking mold preparation.

According to the emphasis on performance, defoamers can be divided into defoamers, defoamers, and defoamers. Silicone antifoam and non-silicone defoamers are used in different processes in the textile printing and dyeing industry. Silica defoamer is an important development direction of textile dyeing and finishing auxiliaries, which has the characteristics of strong defoaming performance, long bubble inhibition, small dosage, stable chemical properties, high temperature resistance, non-toxic and non-toxic.

In textile dyeing and finishing processes, the commonly used defoamer is an emulsion containing 1% 2% polysiloxane.

Hello! High-temperature printing and dyeing defoamer is especially suitable for sizing, scouring, printing and dyeing, as well as high-temperature overflow dyeing or refining agent addition.

High-temperature printing and dyeing defoamer, silicon polyether bonding technology and special modified polysiloxane self-emulsifying high-temperature resistant defoamer (the higher the temperature, the better the foam inhibition effect).