defoamer-antifoam

How to choose a defoamers for the formulation system correctly? What factors affect the defoaming efficiency?   After learn the factors that affect the defoaming efficiency, let's take a look at the impact of our main protagonist today-"defoamer" on the coating system.   So is the defoaming efficiency higher, the defoamer is better? Generally speaking, the better the antifoaming effect of the defoamer, the worse its compatibility with the system. Therefore, the best choice of defoamer is to achieve a balance of performance. There are many factors in the coating formulation that affect the air bubbles and defoaming, so the selection of defoaming agents should be considered comprehensively.   Surface tension The surface tension of the paint has a greater impact on the defoamer. The surface tension of the defoamer must be lower than the surface tension of the paint, otherwise there will be no defoaming and foam suppression effect. The surface tension of the coating is a va...

Antifoam Applications - When To Use or Should You Use Them? Foam is a gas (usually, air) dispersed in a liquid containing some impurity. In secondary treatment systems, bacterial activity is usually the main cause of foam, although mechanical action (cascading flow, pumps, violent agitation, etc.) and chemical contamination also can cause foam. Surfactants in the influent or in some polymer treatments can also cause foaming. Excessive foam, especially in an aeration basin, can cause a variety of problems. A foam blanket on the aeration basin can interfere with oxygen uptake of the microorganisms and hinder BOD reduction. Foam can also cause the biological floc to float producing a sludge which will not settle in the final clarifier. Safety hazards and aesthetic problems occur when wind blows foam across parking lots or highways or neighboring locations. Foam can become an aesthetic problem when a thick blanket of foam floats down a stream from the plant outfall. Antifoams control or e...

What is a defoamer / deaerator’s purpose in the system? Defoamers prevent formation of foam during manufacture and application of coatings and printing inks. Foam that is already formed is destroyed and air occlusions are prevented. Deaerators prevent development of air occlusions and pinholes. Why use a defoamer? The occurrence of foam is considered an undesirable but unavoidable phenomenon in coatings and printing inks. The formation of foam interrupts production processes, reduces the effective volumes in the production plant, and leads to unnecessary down time. Foam also interferes with the application process. In printing, foam can cause the ink reservoirs to overflow and can impair ink transfer from the printing cylinder to the substrate. Dried foam leaves surface defects in the paint film. To prevent foam and destroy any foam present, defoamers must be added to the formulation. defoamer vs. deaerator? To eliminate macro-foam on the surface, to prevent air occlusions, and...

Why use defoamer for waterproof paint and how to use defoamercorrectly? What is waterproof paint? Waterproof paint is a kind of paint that can prevent rain or groundwater from leaking. Acrylic waterproof coating is a one-component water-emulsion waterproof coating made by using acrylic polymer emulsion as the base material and adding other auxiliary additives. The waterproof film formed after the waterproof coating is cured has certain extensibility, elastoplasticity, crack resistance, impermeability and weather resistance, and can play the role of waterproof, impermeability and protection. The waterproof coating has good temperature adaptability, easy operation and easy repair and maintenance. The performance indicators of waterproof coatings are as follows: Solid content Solid content refers to the proportion of solids contained in a waterproof coating. Because the coating is formed by the solid components in the co...

Tips for making Coating Formula and defoamer in coating How many factors would affect defoamer performance in the paint&coating? Ⅰ . Surface Tension The surface tension of the paint has a greater impact on the defoamer. The surface tension of the defoamer must be lower than the surface tension of the paint, otherwise the defoaming and antifoaming effects cannot be achieved. The surface tension of the coating is a variable factor, so when selecting a defoamer, a constant surface tension must be taken into account, and the surface tension change factor must be taken into account. Ⅱ . Effects of other additives The surfactants used in coatings are mostly incompatible with the tendency of defoamers to function. In particular, emulsifiers, wetting and dispersing agents, leveling agents, thickeners, etc. can affect the effectiveness of defoamers. Therefore, we must pay attention to the relationship between different auxiliaries when ...

The factors that would influence defoamer performance An auxiliary agent capable of suppressing foaming, breaking bubbles, and defoaming is called an antifoaming agent. An important indicator of the quality of defoamers is the length of defoaming time. There are many types of defoamers, such as silicone, mineral oil, high carbon alcohol, polyether, and compounding. Defoamers are oily and watery, and different defoamers are used in different industries. In the production process of many industries (such as textile printing and dyeing, pulp and paper, paint, water treatment, building materials industry, metalworking fluid, industrial cleaning, etc.), a large amount of foam is often generated due to stirring, vibration, boiling, etc., if not Properly inhibited, the bubble will bring a lot of trouble to the production, such as affecting the normal production, reducing the amount of equipment payload, resulting in product quality and production capacity decline. In order to eliminate and...

Three tips for testing viscosity of defoamer/antifoaming Many customers make certain demands on the viscosity of the Defoamer when purchasing the product, but the different supplier has different standard, how to check the authenticity of the corresponding viscosity coefficient? Now let Invely help you. Temperature affects viscosity The temperature will affect defoamer viscosity seriously.the viscosity of viscosity of defoamer will be relatively higher in winter under normal circumstances, but the viscosity of the defoamer will be lower in the summer. In this case, if you test the viscosity of the defoamer, you must pay attention to the room temperature. It is recommended that you try to keep the room temperature at about 23 degrees when testing the viscosity. This will ensure the uniformity of the viscosity test. Speed Viscosity Tester or Mechanical Viscosity Tester? Many customers will encounter such a problem when testing the viscosity of defoamer. which one is better?Spe...

The magical effect of fumed silica in silicone rubber Fumed silica is one of the most important high-tech ultra-fine inorganic new materials. Due to its small particle size, it has a large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, thermal resistance, It has specific properties in terms of electrical resistance, etc. Its superior stability, reinforcement, thickening and thixotropic properties are unique in many disciplines and fields and have an irreplaceable role. Today, Xiaobian will work with you to learn how to apply fumed silica in silicone rubber. Application of fumed silica in high temperature vulcanization (HTV) silicone rubber The use of fumed silica can be divided into silicone materials and other fields, in which the amount of silica in the silicone material is nearly 60%, and the silicone rubber is the most used material in the silicone material. It can be added in an amount of up to 50% ...

How to use defoamer for oil& gas? Do you know why should use defoamer in oil&gas production? In the petroleum industry, defoamer is necessary from the extraction and processing of crude oil. During the drilling process, a mud pump is used to hit the mud along the hollow of the drill pipe to the drill bit at the bottom of the drill pipe, and then The space between the drill pipe and the wall of the well is returned to the ground, and the cuttings that are drilled down are carried along with the return. After the cuttings have settled in the mud pool, they must be recycled for clean use. There are several main ways of foam generation during drilling: When natural gas overflows in the formation, foam is generated in the mud, and the surfactant in the mud has the function of stabilizing the foam, so that the foam generated by the mud is too late to burst and circulate to In the well; Too much surfactant; Foam generated from the gas generated by decomposition or fermentation...

D oes Silicone defoamer improve the performance of the slurry or increase the production risk? In the pulping process, in order to obtain white pulp, the chips are subjected to steaming, washing and bleaching processes (Fig. 1), but in this series of fiber processing, a large amount of water is consumed, and a large amount of foam is generated, so the selection is appropriate. Defoamers are critical. Figure 1 Wood chips, post-cooking slurry, slurry after washing, bleached slurry For many years, the paper industry has made many efforts to reduce energy, water and chemical consumption in order to achieve sustainable development. The use of silicone defoamers is one of them. The use efficiency of silicone defoamers can greatly enhance the sustainable development indicators of pulp and paper enterprises. Silicone is a kind of polymer material, in which polysiloxane is composed of silicon-oxygen bond as the skeleton, and the structure is shown in Fig. 2. It represents the infinite p...

How to evaluate defoaming efficiency and compatibility of defoamer in paint？ Defoaming efficiency test Foam height method When defoaming agents are added, the defoaming rate of defoamers is a concern of many engineers. When testing the defoaming efficiency, we took the foam height method. Method: Take a certain amount of the defoamer-containing paint into the measuring cup with the marking line, use the micro air compressor to introduce the air into the coating system, observe the height of the coating inside the cup, the higher the liquid level, the more the defoaming effect difference. It can be used for rapid screening of initial defoamers, and needs to be combined with other test methods such as specific gravity method and roll coating method. Defoaming efficiency test Specific gravity method The high-speed agitated paint is poured into a density cup, the density of the paint is measured, and then the paint is sealed and stored, and the density is measured ...

How to dilute silicone defoamer? Ø   Raw Material Silicone defoamer 200g Clean water (deionized water, tap water) 768g Thickener 30g (3.0% of total defoamer) Preservative 2g (0.2% of total defoamer) Appropriate amount of alkaline water (10% NAOH solution) Ø   Steps 1. Add 30g of thickener to 768g of water, add 30g of thickener, stir for 5min, add 2g of preservative, and carefully adjust the pH of the above thickener aqueous solution with alkaline water (10% NAOH solution) Adjust to 7.0~7.5 (preferably 7.5). Note that when the aqueous solution gradually becomes clear from the light milky white, the viscosity also increases, and the alkaline water needs to be added very slowly; 2. Add 200g of silicone defoamer to the above prepared thickened water, stir evenly, and measure whether the pH value is between 7.0~7.5. After passing the test, it can be discharged. Ø   Note 1. In this method, the concentration of the thickener ...