defoamer-antifoam

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...

How to choose defoamer in concrete industry? The rapid development of the concrete industry has placed higher requirements on the admixtures used in concrete, especially the performance of water reducing agents. Polycarboxylic acid high-performance water reducer is the latest generation of water reducer. Its high water reduction, good dispersibility and plasticity retention allow it to rapidly expand the application field and gradually replace naphthalene and melamine and other high-efficiency water reducers. However, due to the molecular structure of polycarboxylic acid water reducing agent, more bubbles are introduced during concrete mixing, the size is not uniform, and the quality of concrete is affected. It is necessary to improve the workability of concrete by adding defoamers to meet the production needs. . The compounding with polycarboxylic acid water reducing agent requires good compatibility of defoamer and water reducing agent, little effect on water reducing rate of wat...

A defoamer is an agent added to a liquid to remove surface foam and help release trapped air. These agents are common in many foaming liquids such as cooking oil and laundry soap. They are also common in a wide range of industrial processes ranging from oil refining to wastewater treatment. In most cases, a deformer is placed in a water or oil mixture before being placed into the liquid. These mixtures help to distribute the defoamer evenly through the liquid and often promote a specific type of air removal. Foam is the layer of bubbles that rises to the top of a liquid. Regardless of the liquid, the bubbles operate the same way. Air becomes trapped in the liquid and slowly combines to form a bubble. The bubble will rise to the surface where it will collect in a thick layer of bubbles, or foam. It is possible that the foam would instead sink to the bottom, if the liquid were somehow lighter than air. When air is trapped in certain liquids, it can cause a problem when those liquids...

How to use defoamer in delayed coking? Why should use defoamer for delayed coking?  Delayed coking is a process in which heavy cracked oil is heated to undergo deep cracking and condensation reactions and converted into gas, gasoline, diesel, wax oil and coke. During the reaction process, the coke tower can be divided into three main areas along its height: u   The lower part is a coke layer; u   The middle part is a high-viscosity colloidal asphaltene called a foam layer; u   The upper part is a hydrocarbon layer. The foam layer will maintain a certain height under a certain temperature and pressure. The main factors affecting the height of the foam layer are: the amount of processing, the nature of the raw materials, the exit temperature of the heating furnace and the circulation ratio. Trying to reduce the height of the foam layer is an important measure to increase the throughput. ...

How to choose defoamer for fermentation accordingly? Foam is a phenomenon often encountered in daily life and industrial and agricultural production. In industrial and agricultural production, sometimes foam is needed in production, and then foam needs to be produced in production; sometimes foam is not needed in production, and foam needs to be eliminated at this time. Foam refers to a gas-liquid dispersion system in which a gas is dispersed in a liquid, the gas is a dispersed phase, and the liquid is a dispersion medium. Pure liquids are difficult to form foam, because there is only a very thin layer of water film between the foams. This layer of water film is very unstable and easily damaged. The blister life of pure water is within 0.5 s. Therefore, it is difficult to generate foam. Only with the addition of surfactants or high molecular compounds can a stable foam be formed. How to foam generation The creation of a bubble must meet two conditions: Gas-liquid two-ph...

How can defoamer work in Paint&coating? How bubbles are generated and how to stable bubbles in coatings? During the coating production process, air will be drawn into the air to form bubbles. Certain raw materials in the coating, such as surfactants and dispersants, will stabilize the bubbles. Bubbles can also be generated during the coating process, which mainly depends on the way the coating is applied. For example: curtain coating can continuously entrain air in the paint, airless spraying is also easy to entrain air, and it is easy to generate air bubbles when spraying under relatively low humidity or high temperature conditions.Stable bubble principle: l  Marangoni effect (fluid backflow caused by surfactants, counteracting gravity) Electrostatic effect: The electrostatic repulsion of the surfactant thickens the liquid layer film of the bubbles, thereby stabilizing the bubbles. 2. Principle of paint defoamer Defoamers work during or after the formation of a ...

Silicone is so widely used! Let's learn silicone oil production technology Silicone oil is a kind of linear small molecule silicone polymer with Si-O-Si as the main chain and organic groups in the side chain. It is widely used in textile, daily chemical, mechanical processing, chemical, electrical and electronic, medical and health, etc. industry. Silicon oil is usually kept in a liquid state at room temperature. As the molecular weight increases, the viscosity also increases, so viscosity is an important physical property index of silicone oil. 2017 China's silicone oil consumption situation Classification of silicone oil Silicone oil is generally divided into two categories: general silicone oil and modified silicone oil. There is also a class of co-modified silicone oils and derivatives - ternary modified silicone oil Silicone oil properties Silicone oil is generally a colorless, odorless, non-toxic, non-volatile liquid with the following characteristics...

Why silicone exports have shrunk sharply, and silicone prices have fallen off the cliff in China??? In early May of this year, Trump announced on Twitter that "the import tariff will be imposed on Chinese goods by 25%." After that, the US government officially issued an announcement that it is scheduled to impose a 25% tariff on China's 200 billion goods on June 1. It is ridiculous that on May 31, the US government will "take consideration of customs enforcement factors" to levy the taxation date. It was postponed for half a month. This trade war has indeed had a relatively large impact on China's import and export of US goods. But in terms of organic silicon, this year's Sino-US trade war is less affected than last year. Today, based on the export data of silicones from January 2018 to April 2019 and the prices of various silicone products, the impact of trade warfare on silicone prices is analyzed through export conditions, and the reasons for the re...

China Silicone new construction and expansion projects are summarized! These companies have to expand production! Silicone monomer intermediate Enterprise: Wynca Group Project:  300,000 tons of organosilicon monomer chlorine resource comprehensive utilization project Venue:  Zhenjiang New Material Industrial Park, Zhenjiang City, Jiangsu Province Total investment:  about 1.12 billion yuan Details:  150,000 tons / year of organic silicon monomer, 0.5 million tons / year of hydrogenated silicone oil, 50,000 tons / year of raw rubber, 50,000 tons / year 107 glue. Construction started at the end of October 2017 and is expected to be completed by the end of December 2019. After the project is put into production, the base will become one of the most complete and largest integrated silicon production bases in China's industrial chain. The Wynca silicone monomer will also reach 550,000 tons, making it the largest silicone producer in Asia. Enterprise: Hoshine sili...

Printing and dyeing process In the printing and dyeing industry, according to different raw materials, different yarn types, different fabric structure, different printing and dyeing requirements, the process flow is not a completely fixed mode, such as chemical fiber textile printing and dyeing, wool textile printing and dyeing, silk industry silk Weaving and dyeing, the difference is quite large, and even they can hardly learn from each other. Then, we first understand the routine processes in the three industries of spinning, weaving, printing and dyeing, etc., to have a simple understanding of the spinning and dyeing industry, and also have an overall impression of the source of bedding fabrics. Main processes of the spinning process: cleaning, carding, combing, drawing, roving, spinning Main processes of weaving process: winding, warping, sizing, piercing, weaving, finishing These are the main processes, and each company will have a slightly different process depending on the...