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News > Dynamic industry > Epoxy Additives - defoamers

Epoxy Additives - defoamers

(1) functional and performance requirements
① function. Manufacture of cement mortar substrates, there are many voids, the construction of the air in the pores will be replaced with paint out construction; paint due to the introduction of surfactant and mechanical operations and other reasons, will produce bubbles and foam, have a serious impact on the quality of the film mixing and scraper makes a lot of air entrapment within the coating; paint itself as high viscosity, bubbles in the coating film is stable, difficult to discharge, these factors make the paint shall be added to accelerate the discharge defoamers, reduce and eliminate voids, bubbles marks and other defects. Thus, the coating need to use defoamers.
Defoamers usually inhibit bubble and defoaming function. Defoamer defoamers defoaming principle is entering surface of the foam, the foam surface tension of the dramatic changes in the interface between the rapid spread of anti-foaming agent, into the foam membrane, the foam wall thinning, resulting bubble burst; suppression foam produced mechanism that suds are dispersed in the coating, it is possible to cause the active molecule apart foaming, prevent intimate contact between the molecules, preventing foam stability of the foam is controlled at the initial stage, played the role of suds.
② performance requirements. To play a good defoaming effect, anti-foaming agent to be able to meet the following requirements: a defoamer either dissolved in the coating system; b defoamers surface tension is lower than the surface tension of the coating; c defoamers... have good dispersion in the coating can be rapidly and uniformly dispersed in the coating system;. d defoamers and paint ingredients will not react; e defoamers will not adversely affect the performance of the coating. .
(2) The solvent-based paint defoamer for solvent-borne silicone defoamers are mainly polymeric defoamers and anti-foaming agent. The former as a mixture of silicone and modified silicone and silicone and other foam destroying polymers; the latter is mainly acrylate copolymer and vinyl copolymer. Here are some typical commodity.
①C-885 FBRA foaming, foam breaking agents Industrial Co., Ltd. of Taiwan's three products, Chen into silicone aliphatic and aromatic hydrocarbons, the appearance of clear liquid, suitable for solvent-based acrylic, epoxy and polyurethane systems paint, anti-foaming, defoaming, good foam suppression effect.
②BYK-071 Silicone defoamer BYK-Chemie, Germany-based company (BYK Che-mie) products, component foam destroying polysiloxane solution, relative density 0.87; can effectively prevent the formation of bubbles in the paint production and construction process ; better clarity in most paints, mainly for solvent-borne architectural coatings, wood and furniture coatings.
③Airex930, Airex931 defoamer Tego UK Department of Chemical Company (Tego) products, Chen into fluorine-containing organic silicon solution, the relative density of about 0.95; For alkyd, oxidized rubber, acrylic paint, etc., can make these coatings degassing, prevent coating pinholes.
④ TROYSOL AFL, TROYSOL 307 defoamers and anti-flooding agents are in Castro Chemical Company (Troy Chemical Corp) product, TROYSOL AFL contains no silicone surfactants, TROYSOL307 of silicone copolymers containing non-particle surface active agent; for alkyd paints, chlorinated rubber, acrylic, etc; to prevent the bubble wood, limestone and other porous surfaces retention, reduce pigment flooding and floating.
(3) water-based paints with water-based paint defoamer defoamers although grave in kind of low molecular weight alcohols (eg n-octanol), phosphates (such as tributyl phosphate), silicone oils and silicone emulsions (such as emulsion A silicone oil, phenylmethyl silicone oil emulsion, etc.) and other species, but the actual application of a variety of goods defoamers, these defoamers in composition of goods is rarely a single substance, mostly of two or more constituents composite.
Defoamers current commercial varieties on the market range, use the good effects of various imported products. For example, Germany Bike Gong Division (BYK Chemie), American Gas Products Co., Ltd. (AIR PRODUCTS), the British company Allied Colloids (Allied Colloids), BASF (BASF), Bayer (Bayer), Dow Corning Corporation (Dow Corning) , 荷兰埃夫卡 additives company (EFKA), the German company Henkel (Henkel), British chemical company ICI (ICI), Shing Wo company (SERVO), Tego Chemical Company (Dego), according to Castro Chemical Company (Troy Chemical Corp), Union Carbide (unio CARBIDE), profit Chemical Company (Worlee) and Rhone-Poulenc (RHONE PIULENC) and other companies produced many different types of goods are sold in China and get more applications. Here are some typical commodity.
①074,080,082 series of defoamers. Department Deuchem (Shanghai) Chemical Co., Ltd, a mixture of 074 defoamers organic esters and hydrocarbons of non-organic silicon; a mixture of amides and hydrocarbons of 080 non-silicone; 082 non-silicone-containing hydrophobic a mixture of mineral oil particles. 080 In addition defoaming significant role, but has excellent water reducible to suppress foaming during production of construction when the bubble elimination are effective, does not produce excessive use of "fish eyes"; 082 in addition to anti-foaming action outside Suds suppression is particularly striking in the production process of the bubble and the bubble suppression during the construction of the elimination of all effective.
②Burst 100 defoamer. US Federal Department of gum company (Allied Colloids) product, a silicone composition for water-based paint anti-foaming, anti-foaming effect efficient, stable, long-lasting, the amount of 0.25% -0.5%.
③BYK036 defoamers. Department of German 毕克公 Division (BYK Chemie) products, the main components of an emulsion containing silicone paraffinic mineral oils and hydrophobic components for defoaming pigment volume concentration of 20% to 85% of the paint system, the amount of 0.1 % -0.5%.
④Foamer Star A36 defoamers. Department of Chemical Technology Co., Ltd. Shenzhen Ocean Power products, the main component of anti-foaming substance specific molecular mechanism and the polysiloxane composition for a variety of high-gloss water-based coatings, good degassing effect, can eliminate the coating in the needle hole, no shrinkage sick.
⑤Nopco309-A defoamer. Germany-based Bayer AG (Bayer) products, mainly composed of silicon and a mixture of additives for aqueous coating defoaming, with high anti-foaming ability and excellent compatibility, the amount of 0.1% -0.5% .

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