What should I do if the defoamer causes the paint to flocculate?

1) For sludge dewatering, according to the nature of the sludge, the corresponding model of this product can be selected, which can effectively dewater the sludge before the sludge enters the filter press, when dewatering, the floc is large, the filter cloth is not sticky, the filter is not dispersed, the mud cake is thicker, the dewatering efficiency is high, and the moisture content of the mud cake is less than 80%. 2) For the treatment of domestic sewage and organic wastewater, this product is positive in the matching or alkaline medium, so that the sewage with negative charge of suspended particles in the sewage is flocculated and precipitated, and the clarification is very effective. For example, the production of food alcohol wastewater, papermaking wastewater, urban sewage treatment plant wastewater, beer wastewater, monosodium glutamate factory wastewater, sugar wastewater, high organic content wastewater, feed wastewater, textile printing and dyeing wastewater, etc., the use of cationic polyacrylamide is several times higher than the use of anionic, nonionic polyacrylamide or inorganic salts The effect is several times or tens

Paint flocculation is the phenomenon of the formation of agglomerates in the pigment or dispersion, which can be understood as the reaggregation of particles after being dispersed.

Treatment method: reduce the viscosity of the coating system to make the flocculation group smaller and the flocculation speed decrease; Increasing the temperature causes a decrease in viscosity, which indirectly reduces flocculation; Control the flash time.

Reduces the movement of pigment particles and is not easy to cause flocculation.

Increasing the pigment concentration will cause the viscosity of the system to rise, reducing the tendency to flocculate.

Choosing the right good solvent will fully stretch the polymer molecules of the binder, increasing the mutual repulsion between the pigment particles. Prevents pigment flocculation.

The main causes of paint flocculation are as follows:

1.Pigments and fillers do not wet sufficiently: When pigments and fillers in a paint are not completely wetted by the liquid, they tend to clump together, which can lead to flocculation of the paint.

2.Foaming causes volumetric expansion: During paint production and application, if foam is generated, the foam bursts and leaves voids in the paint that can cause the paint to expand in volume, which in turn can cause flocculation.

3.Excessive wetting and dispersing agent in the paint: In order to make the pigments and fillers easy to wet, disperse and stabilize, too much wetting and dispersing agent is added, which will also lead to the flocculation of the paint.

4.Improper use of thickeners: Thickeners will thicken the walls of the foam film and increase the elasticity of the foam, so that the foam is stable and difficult to eliminate. If the thickener is not used properly, it can also lead to the flocculation of the paint.

5.Unsatisfactory substrate treatment: for example, the wood has a high moisture content, or the pine resin and the aromatic oil contained in the wood itself are not removed, which causes foaming when it volatilizes naturally, which in turn causes the paint to flocculate.

6.Incomplete drying: Applying a finish layer before the paint is completely dry or the base layer is not dry can also cause the paint to flocculate.

Defoamers do not cause paint to flocculate. A defoamer is an additive that is used to control the formation and growth of foam. They act as defoamers by reducing the surface tension, allowing the foam to burst and disperse in the coating.

Paint flocculation is usually caused by the aggregation of pigments, fillers, and other solid particles in the paint. The defoamer does not cause the aggregation of pigments or fillers and therefore does not cause the paint to flocculate.

However, when using defoamers, it is necessary to pay attention to choosing the right defoamer for the type of paint and using it according to the appropriate dosage. If too much or too little defoamer is added, it can affect the defoaming effect and even negatively affect the performance of the coating. In addition, the defoamer should be compatible with the other components of the coating to avoid negatively affecting the performance of the coating.

In this case, the technology should be consulted to see if it has a greater impact on the product.

Or choose to switch to a better suitable defoamer.

Causes of paint flocculation and blistering:

1) Foaming causes volume expansion, which reduces the utilization rate of equipment;

2) Foaming limits the stirring speed and prolongs the blending time;

3) Pigments and fillers cannot be sufficiently wetted;

4) When injecting into the packaging barrel, because the continuous injection production line is injected by volume, if it foams, the barrel will not be filled, and the weight of the paint in the barrel will be uneven after the foam bursts, which will interfere with the packaging operation. Therefore, when mixing the coating and injecting it into the packaging barrel, a certain amount of coating defoamer can be added to avoid the above foaming problems.

Defoamers for coatings can be characterized by low dosage and fast defoaming.

It is mainly caused by poor dispersion of pigments and fillers. The pigments and fillers used for coatings must be specially treated to have good compatibility and dispersion with resins and solvents to ensure that the quality of the coating remains stable for a long time.

In order to reduce costs, some manufacturers use poor quality pigments and fillers, and the dosage is large, resulting in flocculation and precipitation of coatings in a short time.

Guangzhou Yuheng paint defoamer is a composite type of organic polyether ester, mineral oil and alcohol, which is refined by special technology. It has the properties of self-emulsification, easy dispersion, strong versatility, good defoaming, and long-lasting foam inhibition. It's very simple, just reduce the amount of addition, the amount of addition will also affect the product, and the cost will also increase, and the general amount of addition is around.

The stirring or shaking during the production of the paint may cause the paint to bubble due to the entry of gas, improper operation of spraying, brushing, and rolling during the construction process, and the presence of foaming substances in the raw materials. If the defoamer for the coating is unreliable, it will be eliminated by the market, and if you are not at ease, you can take a sample to test it.

The cause of coating blistering is the poor water resistance of the base material and the contamination of the putty layer by oil and dust. To avoid blistering of the paint, first of all, the substrate must be thoroughly treated before the coating is applied to ensure that the substrate is dry, free of oil and dust.

Because of the following:

1) Small surface tension;

2) the presence of surfactants;

3) There is a gap on the substrate to be painted;

4) Large surface viscosity;

5) Improper operation of spraying, brushing, and rolling during the construction process;

The use of paint defoamers can solve the foaming problem caused by these factors.

Mercerized paint defoamer is a primer defoamer, topcoat defoamer, water-based wood paint, industrial paint, water-based paint mixing, water-based paint, engineering paint, water-based industrial paint defoamer, paint industry, water-based paint and other systems have a special effect, especially for fine foam has a good effect, with the advantages of low dosage, fast defoaming, long foam inhibition time, good water solubility, no oil spots, etc., will not affect the film-forming and will not produce shrinkage porosity, fisheye and other problems.

Mercerized paint defoamer is a primer defoamer, topcoat defoamer, water-based wood paint, industrial paint, water-based paint mixing, water-based paint, engineering paint, water-based industrial paint defoamer, paint industry, water-based paint and other systems have a special effect, especially for fine foam has excellent effect, with the advantages of low dosage, fast defoaming, long foam inhibition time, good water solubility, no oil spots, etc., will not affect the film-forming and will not produce shrinkage holes, fisheye and other problems.

Performance characteristics: 1. Strong defoaming and foam inhibition power, low dosage, does not affect the basic properties of the foaming system 2. Good heat resistance, stable chemistry, non-flammable and non-explosive.

Defoamers are mainly used to remove foam and do not corrode the coating.

The amount of defoamer added is small, and it does not affect the substrate within a reasonable range.

What causes industrial water-soluble paint foams?

1) In the production of water-soluble coatings, air enters them due to the stirring operation, resulting in the formation of foam that is difficult to eliminate.

2) In the process of construction, due to the low construction temperature, the viscosity is large, which will also lead to the generation of foam.

3) When painting, dragging back and forth will cause blistering, if the diameter of the spray gun is too small, the stucco pressure is too great, and the stucco is painted.

There are pros and cons to adding defoamers, and the disadvantages of defoamers for coatings are:

If you add too much, it will easily lead to an increase in costs.

There are too many defoamers on the market, and there may be inferior products that will affect the appearance of the paint.

If the flocculant produces foam during use, it is possible to add flocculant defoamer, which is conducive to flocculant defoaming

It is possible to add flocculants.

Finish without worrying, you can eliminate foam.

Flocculant foaming, according to the use characteristics of flocculant defoamer, it is recommended to use flocculant defoamer.

Targeted defoaming will make the foam disappear faster, and it also has good foam suppression properties.

About the use of paint defoamers. sxp-116

1. How to use.

SXP-116 defoamer is a mixture, which is an unstable system, and delamination will occur after a long time, which is a normal phenomenon. It is recommended to stir slightly before use.

SXP-116 defoamer is not recommended to be diluted with water, and the company is not responsible for the increase in the cost of use caused by water dilution.

The amount of SXP-116 defoamer is generally injected directly into the foaming system during use.

2. Packaging and storage.

SXP-116 defoamer is packaged in 25kg and 200kg plastic drums, and the defoamer should not be exposed to sunlight or near heat sources.

In the process of using paint defoamer, it is also necessary to pay attention to the fact that too much can be added, generally speaking, it needs to be determined according to the specific experiment, otherwise adding too much will also cause problems such as shrinkage holes, oil splashes, needle eyes and so on. Most defoamers cannot be added directly to the diluted coating, it is generally best to add it at a higher viscosity of the paint, remember to add it in two parts, the first time in the abrasive, and the second in the lacquer. There is also a lot of relevant knowledge, it is recommended that you find Dachuan defoamer, how to use the paint defoamer, I hope it will help you, hope.

Defoamer. The application in the coating industry is very important, different defoamers are used in different coating systems, it is very important to choose the right defoamer, and it is more important to use the defoamer. When using defoamers, the following issues should be noted.

1. Temperature: The temperature directly affects the quality of defoaming, and too high or low temperature affects the volatilization of the defoamer, and it may also cause demulsification due to high temperature.

2. Use environment: The use environment must be good, and the paint defoamer will have adverse effects with the surrounding environment.

3. PH value: clearly understand whether the defoamer is acid or alkali resistant, and use the pH range.

4. Dosage: The addition of special defoamer for water-based coatings is generally not recommended to add too much, because it may cause adverse reactions, such as shrinkage holes, oil splashes and other problems. Generally, the principle of multiple small quantities is adopted, and finally a small test is carried out according to their own system, and the optimal addition amount is obtained in the pilot test.

5. Tips: Most water-based paint defoamers can not be directly added to the diluted water-based coatings, it is best to add them when the viscosity of the coating resin is relatively high, and the first time to add the abrasive, the second time in the paint, the dosage of each 1 2.

6. Dilution skills: stir well after stratification, even if it is not stratified before use, do not dilute at will, if you really want to dilute, please use thick aqueous solution under guidance. After the paint defoamer is diluted, it should be used as soon as possible in an effective time, and after a long time, the defoaming effect will not be good.

7. Applicability on the machine: In the end, it depends on the customer's usage habits and the type of defoamer required by their own system.

Before the use of paint defoamer, it should be properly stirred evenly, and the addition amount in high-viscosity latex paint is 1/1000 to 5/1000, and the addition amount in paper coating, low-viscosity latex paint and water-soluble paint is 5/10,000 to 5/1000.

The paint defoamer is non-toxic, non-flammable and explosive, stored in a cool, sheltered place, and stored in a closed place. The storage period is 6 months, and there is no obvious stratification. Storing the product beyond the best before date stated on the label does not mean that the product cannot be used any longer.

However, in order to ensure the quality of the product in this case, it is necessary to re-check the relevant properties of the product.

1. The general paint defoamer can be added directly to the stock solution, or it can be added in batches, half of it is added in the grinding stage to inhibit the production of foam, and the other half is added in the paint mixing stage. The long-term effect of this product is related to the system. The dosage is the total recipe:. Experiment with the best dosage.

2 Applications:

1. Especially suitable for water-based coating system;

2. It can prevent microbubbles and large bubbles;

3. High degassing efficiency;

4. High compatibility;

5. Suitable for varnish and base paint;

6. It can be used for airless spraying formula;

7. Surface coating of high-build coatings, brushed coatings and synthetic latex;

8. Interior and exterior wall latex paint; Waterproof coatings, medium and high PVC latex paints, relief paints, low-gloss magnetic paints, anticorrosive paints, various engineering paints, PVC suspended resins and, plant or vegetable detergents, etc. In the Federation there are detailed instructions if you want to know.