Common knowledge of coating: diluent and its correct use

Core tip: when people buy paint coating, as a paint coating matching, there will be diluent in general Many people don't know what diluent is? Today we are going to know what diluents are and how to use them correctly In general, diluents are volatile liquids used to dissolve and dilute coatings It can be used to adjust the viscosity of the coating to meet the coating requirements Diluent is usually composed of solvent and diluent, sometimes a part of cosolvent is added A substance that dissolves other substances is called a solvent The solvent used in the coating mainly dissolves grease, paint, resin and fiber Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: people in the purchase of paint coating, as a paint coating matching will generally have diluent, many people do not know what is diluent? Today we are going to know what diluents are and how to use them correctly In general, diluents are volatile liquids used to dissolve and dilute coatings It can be used to adjust the viscosity of the coating to meet the coating requirements Diluent is usually composed of solvent and diluent, sometimes a part of cosolvent is added A substance that dissolves other substances is called a solvent The solvent used in coating is mainly various organic liquids that can dissolve film-forming substances such as grease, paint, resin and cellulose It is the main component of diluent The cosolvent itself does not have the ability to dissolve the film-forming substance If it is mixed with a certain solvent in an appropriate proportion, the dissolving ability of the solvent can be enhanced Only the solvents used in some coating products (such as nitrolacquer, etc.) need to be added with cosolvent Although the diluent can't dissolve the film-forming substance, it can be used together with the solvent of the coating without harmful effect The application of diluent is mainly to adjust the evaporation rate of diluent and reduce its cost Solvent, cosolvent and diluent are not absolute The same organic matter can be the solvent of one kind of coating, but it is the cosolvent or diluent of another kind of coating Therefore, they are often referred to as organic solvents, and diluents are actually just a mixed solvent For a specific variety, it is important that the proportion of the solvent, diluent and cosolvent in its composition should be appropriate, especially the variety and dosage of the solvent and diluent used for the coating Only in this way can the best diluent for the coating be prepared In the preparation of diluent, because the dissolving power and volatilizing speed of various organic solvents are very different, it is necessary to prepare the diluent according to the composition and performance of various coatings and the solvent theory (polar similarity principle, solvation effect, solubility parameter principle) Therefore, different coatings have different diluents For the same coating, due to the different seasons and climates, the composition of diluents is also different For example, in summer, the diluent for paint is adjusted to be slow drying, while in winter, the diluent for paint is adjusted to be slightly fast drying Therefore, diluent products used in summer should not be used in winter, otherwise, it will cause film defects such as undercut due to slow drying At present, there are many poor diluents in the market Although the price is low, they have different components, strong odor toxicity, fast volatilization and poor solubility, which not only seriously affect the health of the construction personnel, but also easily cause the following film diseases: 1 Poor covering power: the film thickness is too thin, and the color of the lower surface can be seen through the film 2 Loss of gloss: before drying, the gloss of the paint film is plump, after drying, it is lack of gloss or the gloss of the paint film gradually disappears in the future 3 Orange peel: the surface of the paint film is uneven, similar to the appearance of orange peel and grapefruit peel 4 Cloud / spot (small spot of silver paint): the color of silver paint changes, forming a piece of dark or light spots, often forming stripes of different colors along the direction of painting 5 Pinhole (PIT): after coating, due to the sharp volatilization of diluent, the paint liquid can't be replenished, resulting in pinhole like pinhole or the same phenomenon as leather pore 6 Prickly heat (solvent bubble): because the diluent volatilizes too fast, the water vapor seeps into the paint film, making the top coat present small bubbles and bubble marks 7 Blurring / fogging: the surface of the paint film is milky white mist 8 Drips, sags, tears: in the process of coating drying, excessive paint on the vertical surface forms the phenomenon of upward and downward flow or thickening of the lower edge of the film Therefore, the correct selection and use of the supporting diluent from the regular manufacturer can not only make the paint film have a good appearance, but also ensure the appearance effect of the paint film after coating because its volatilization speed matches with the paint, and at the same time avoid some disadvantages caused by construction Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,