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Silane coupling agent of the basic situation -- 2016-10-09

Silane coupling agent is a kindof special structure of low molecular weight organic silicon compounds. The general formula for RSiX3, where R representsamino, mercapto vinyl, epoxy, chloropropyl, cyano and methacryloxy groups andother groups. These groups and different matrixresins have a strong ability to react, and x represents a hydrolyzable groupsuch as halogen, alkoxy, acyloxy and the like. Silane couplingagent is trichlorosilane (HSiCl3) and with reactive groups of unsaturatedolefins in th ...

Conclusion of Defoamer -- 2016-10-08

Theaction of the defoamer is to suppress and eliminate the generation of airbubbles. In general, when the viscosity of water-based ink is toohigh, PH value is low, or when the press speed is relatively fast when it iseasy to produce bubbles, if the amount of bubbles will appear larger than thedirty version. Water-based inks generally usealkali-soluble binder, the binder material is an acidic resin alkali solution. Itis an aqueous solution similar to soap, because water-soluble binders have soapc ...

Roller coating test -- 2016-09-30

Roller coating test method is very close to the actualcoating construction conditions, so that different defoamers can distinguishthe role played by. Youcan even try out the amount of added. In the roller coating test, a porous sponge roller pad, the 40grams of paint on the substrate is not adsorbed, can be a dedicated test cardcan also be other standardized test paper jam. The total coating area was 500 cm2. Before each test, therollers were wetted with the same amount of water to ensure reprod ...

Flow coating test -- 2016-09-29

The flow-through test can be used to evaluate thecompatibility and defoaming effect of the defoamer with the coating systembeing tested. The samplesubjected to the stirring test was immediately poured onto a polyester film. Polyester film to be placed in avertical tilt angle of 25 degrees on the frame. Carefully observe the flow smears, showing the presence ofbubbles. The method canalso evaluate the defoaming effect of the defoamer by observing the dry film. In some cases, extremely high levels ...

Some practical tests for defoamers -- 2016-09-28

The effectiveness of defoamers must first be determined inthe laboratory. Itis not advisable to transfer lab test results to production scale withoutfurther testing. Ourwork in the test method developed, combined with the paint manufacturing andconstruction process conditions, the defoamer Gongjiao evaluation is feasible. Different test methods can be selectedaccording to different construction conditions (such as brushing, spraying,dipping, printing, etc.).Stirring testFor our users, the simple ...

The amount and the step of adding defoamer -- 2016-09-27

The amount and effectiveness of thedefoamer depends on the formulation system of the coating or ink, in particularthe type of polymer, the pH, the amount of pigment used, and the chemicalstructure of the other adjuvants used. Similarly, the manufacturing process and construction process onthe type and amount of defoamers are also required.The addition of a method to distinguishdefoamer products from defoamer emulsions and defoamer concentrates isdiscussed. Defoamers Emulsiondroplets of emulsion ...

Water-based coatings and inks have defoaming substances -- 2016-09-26

For aqueous systems, the largest of twotypes of anti-foaming agent is a hydrocarbon oil (mineral oil) class andsilicones. Traditionally,aromatic and aliphatic petroleum derivatives are used as anti-foaming agent inthe composition of the active substance distribution. Early on, the aromatic oil is widely use. But its dangers to healthand the environment hinder their application. Toxicity of aliphatic oil is small, but in an aqueous medium lowcompatibility of the high gloss coating can cause serio ...

Defoamers need role -- 2016-09-23

Current theories about the formation ofanti-foaming and foam degassing is different. Defoamers the role of the air trapped in the interface. Defoaming agent role in the process andthe coated film after coating is completed, so that the coating film dispersedin the tiny air (microbubbles), rapid rise to the surface. But the practical application is oftennot clearly make this distinction. Defoamers also can eliminate microbubbles tosome extent. Defoamersdefoaming mechanism discussed below in water ...

Foam definitions and concepts -- 2016-09-22

It can be defined as the foam of air bubbles in aliquid medium in a stable dispersion. If the general air into the liquid, thebubble generated can assume a spherical shape. Since the air is lessdense than the liquid, and thus it will migrate to the surface, when the gasreaches the surface of the liquid without surfactant, the bubble will burst, theair inside the bubble dissipates, the liquid surrounding the bubble in theprevious and together. Thus, the pure liquid (liquid containing nosurfactant ...

Definition of Some Surfactants -- 2016-09-21

In many inks and coatings processingproduction process, the need to use surface-active substances to achievespecial effects. Forexample, in the production of water-based paint, water-insoluble base materialproduction, water-insoluble base material is required to deal with the use ofemulsifiers. At the same time,we have to improve substrate wetting and coating pigment dispersion by usingadditives.Surfactant most importantcharacteristic is that they have a tendency to build in the interface, such ...

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