What are the disadvantages of defoamers for coatings? Ask for information

Nanhui Defoamer is a professional manufacturer of defoamer, the production process of water-based coating defoamer, strictly implement the ISO09001 product quality management system. First of all, Nanhui defoamer adopts intelligent automatic production process and equipment to ensure the stability and consistency of the product. Secondly, Nanhui strictly controls the selection of raw materials and adopts raw materials that meet international quality standards to ensure the purity and reliability of products.

In addition, Nanhui defoamer has undergone strict quality inspection and acceptance procedures, and enjoys good success stories in the market. Whether in industrial production or daily application, Nanhui defoamer has good defoaming effect and foam inhibition performance. In general, the quality of Nanhui defoamer products is very good, which can meet the needs of various water-based coatings for defoaming and foaming.

Paint defoamers play an important role in eliminating air bubbles in coatings, but they can also have some drawbacks. Here are some of the potential problems with paint defoamers:

1.Affect the performance of the coating: Excessive use of defoamer may affect the performance of the coating, such as the leveling of the coating, the gloss of the coating film, wear resistance, corrosion resistance, etc.

2.Increased costs: The use of defoamers increases the cost of producing coatings, which can increase if too much is added or if a high-quality defoamer is chosen.

3.Environmental pollution: Some paint defoamers may contain harmful substances, which may pollute the environment if used improperly or discharged improperly.

4.Difficult choice of paint defoamer: Due to the wide variety of paint defoamers on the market, choosing the right defoamer can be difficult for manufacturers. Choosing the wrong defoamer can lead to degraded coating performance or poor defoaming results.

5.Dosage control: The amount of paint defoamer added needs to be strictly controlled, otherwise the expected defoaming effect may not be achieved, and it may also lead to waste.

6.Storage and transportation issues: Some coating defoamers may have special requirements for storage and transportation conditions, such as temperature, humidity, etc., and improper storage and transportation conditions may lead to degraded performance or failure.

To sum up, when using paint defoamers, it is necessary to fully consider their potential drawbacks, and choose the appropriate defoamer and dosage to ensure the performance and environmental protection requirements of coatings.

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.

The reduction or disappearance of the defoaming power will also leave unexpected drawbacks on the process behind the defoaming product.

Disadvantages of defoamers for coatings:

Production capacity is greatly limited:

Waste of raw materials and products:

The reaction cycle is extended;

Affect product quality:

Not conducive to accurate measurement:

6. One of the causes of polluting the environment and causing accidents:

The selection of paint defoamer should be comprehensively considered according to the actual situation, mainly including the following aspects:

1.Types of coatings: Different types of coatings may have different causes and forms of foam during construction, and it is necessary to choose the corresponding defoamer.

2.Use environment: In different use environments, such as changes in temperature, humidity and other conditions, the coating quality and the degree of foaming may be affected, and it is necessary to choose the appropriate defoamer according to the use environment.

3.Construction technology: The different construction processes of coatings (such as brushing, spraying, roller coating, etc.) also have an impact on the selection of defoamers, and it is necessary to select the corresponding defoamers according to the actual situation.

4.Defoaming effect: The defoaming effect of the defoamer is one of the important bases for choosing a defoamer. It is necessary to select a defoamer that can achieve the desired defoaming effect, such as defoaming speed, defoaming durability, and impact on coating performance.

5.Safety and environmental protection: The impact of defoamers on personal safety and environmental protection also needs to be considered. Non-toxic, non-polluting, and easily degradable defoamers should be preferred to reduce the harm to personnel and the environment.

6.Cost-effective: The defoamer is also one of the important considerations in the selection of the defoamer. According to the actual situation, the balance between price and effect should be comprehensively considered, and the cost-effective defoamer should be selected.

When choosing a defoamer, it is recommended to first understand the properties of the coating, the mechanism of action of the defoamer, the characteristics of different brands of defoamers, the use of methods, etc., and then consider it comprehensively according to the actual needs.

There are ordinary anti-foaming agents and silicone antifoam defoamers, depending on the variety of coatings, whether it is water-soluble or oil-based! I hope the centralized network can help you.

Paint defoamer is a chemical additive that can be used to control foam on the surface of a paint, offering several advantages:

Prevent bubbles on the surface of the paint: The paint defoamer can effectively control the foam on the surface of the paint, avoid bubbles during painting, and make the coating effect more beautiful.

Improved paint wetting: Paint defoamers can improve the wettability of paints, making them more likely to adhere to the surface of the object to be coated.

Increased paint flow: Paint defoamers can improve the flow of paints, making them easier to apply and coat, increasing production efficiency.

Improve the coating process: The use of paint defoamers can make the coating process more stable and controllable, reduce the probability of coating defects, and improve product quality.

In general, paint defoamer is a very practical coating additive, which can effectively control the foam on the surface of the paint and improve the performance and coating effect of the coating.

The defoamer for polyurethane waterproof coating is a silicone-free composite defoamer that is suitable for eliminating the foam of ethylene propylene latex, pure propylene latex, styrene acrylic latex, vinyl acetate latex and other systems due to its presence in various good defoaming ingredients.

Defoamer is an additive that eliminates foam. Different defoamers have different principles, mainly the following:

1) The surface tension of the foam part decreases, resulting in the bursting of the foam.

The origin of this mechanism is the dispersion of higher alcohols or vegetable oils onto the foam, which, when dissolved in the foam, significantly reduces the surface tension. Because these substances are generally insoluble in water, the reduction in surface tension is confined to the part of the foam, and the surface tension around the foam is almost constant. A part of the reduced surface tension is strongly stretched, extended, and finally ruptured.

2) Destroy the elasticity of the membrane and rupture the bubbles.

The addition of the defoamer to the foam system will diffuse to the gas-liquid interface, making the foam stabilization of the surfactant ineffective and the elasticity of the membrane difficult to restore.

3) Promote liquid film drainage.

Defoamers promote the drainage of the liquid film, causing bubbles to burst. The foam drain rate reflects the stability of the foam, and the addition of a substance to promote foam drainage can also have a defoaming effect.

4) The addition of hydrophobic solid particles will cause the bubbles to burst.

The hydrophobic solid particles on the surface of the bubble attract the hydrophobic end of the surfactant, so that the hydrophobic particles produce hydrophilicity and enter the aqueous phase to play a defoaming role.

5) Solubilizing foaming surfactants can cause bubble bursting.

Some low-molecular-weight substances that can mix well with the solution can solubilize the bubble surfactant and reduce its effective concentration. Low molecular substances such as octanol, ethanol and propanol can not only reduce the concentration of surfactants in the surface layer, but also dissolve the surfactant adsorption layer to reduce the intermolecular tightness of the surfactant, thereby reducing the stability of the foam.

6) Electrolyte disintegration surfactant electric double layer.

By interacting with the electric double layer of the foam's surfactant, a stable foaming solution can be formed. The addition of ordinary electrolytes can dissolve the double layer of surfactants to achieve defoaming effect.

Defoamers eliminate foaming caused by coating additives by having a lower surface tension.

Defoamers can reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce or eliminate the original foam.

Before the use of the cavity and empty defoamer of the internal and external liquid wall paints, it should be stirred evenly, and a small range of experiments should be done to ensure the normal use of the defoamer. After that, the drip addition method or direct pouring method is adopted, and the general use ratio is about the same, which can be adjusted according to the actual situation.

The defoamer of interior and exterior wall paint has no effect on the coating, and the addition to the paint will not affect the basic system of the coating, and will not change the performance, appearance and color of the coating.