echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Coating classification: waterborne silicone coating

    Coating classification: waterborne silicone coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    Core tip: Introduction: Organosilicon coating is a kind of coating with organosilicon polymer or organosilicon modified polymer as the main film-forming material In recent years, organosilicon coating has been widely used and developed for its excellent heat resistance and cold resistance However, it has some disadvantages, such as high curing temperature (150-200 ℃), long curing time, poor adhesion to the bottom layer, poor resistance to organic solvents and high price Therefore, silicone resin is often used to modify oil-based resin With silicone modified acrylic emulsion as the base resin, three series of organosilicon waterborne coatings were prepared and their properties were tested Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Introduction: organosilicon coating is a kind of coating with organosilicon polymer or organosilicon modified polymer as the main film-forming material In recent years, organosilicon coating has been widely used and developed for its excellent heat and cold resistance properties However, it has some disadvantages, such as high curing temperature (150-200 ℃), long curing time, poor adhesion to the bottom layer, poor resistance to organic solvents and high price Therefore, silicone resin is often used to modify oil-based resin The silicone modified acrylate emulsion is used as the base resin to prepare three series of organosilicon waterborne coatings and their properties are studied Raw materials: Pigment: rutile titanium dioxide, chrome green; anti-corrosion filler: zinc powder; filler: bentonite, talcum powder, aluminum phosphate; film forming assistant: glycol butyl ether; defoamer: nfk3-01; thickener: ser-ad FX 1010 Preparation: three series of water-based coatings were prepared by the color paste method: silicone common white coating, silicone heat-resistant and anticorrosive coating and silicone high temperature resistant coating The preparation process is divided into four steps: 1 The preparation of sodium polyacrylate takes the formula amount of methyl phenylenoic acid, uses potassium persulfate as initiator, adds the formula amount of sodium hydroxide aqueous solution, and magnetic stirring at 75 ℃ for 5 hours to prepare the sodium polyacrylate solution with solid content of 20% 2 Pre treatment of bentonite: weigh the bentonite of formula amount, put it in beaker, add the NaCO3 aqueous solution of formula amount, and put it for 24 hours to obtain sodium based bentonite 3 The preparation of color paste in the treated bentonite, adding the formula amount of pigments and fillers, distilled water, 1 / 2 film-forming assistant and 1 / 2 thickener, the uniform and stable color paste was prepared by high-speed mixing in high-speed shear emulsifier for 30 min 4 the mixture of color paste and emulsion is called the quantitative color paste and emulsion according to the formula of the pigment base ratio The mixture is evenly mixed under the stirring After 2h, the defoamer and the residual film builder and thickener are added, slowly stirring for 10 min, placing 24 h Performance test: heat resistance: prepare paint film on four steel sheets according to GB / T 1727-1979, place three of them in muffle furnace which has been adjusted to the test temperature, after reaching the specified time, cool the three samples to (25 ± 1) ℃, compare with the samples left in advance, and check whether there is any phenomenon such as delamination, wrinkle, bubbling, cracking and discoloration Hardness test: according to GB / T 6739-1986 (1996), pencil method is used (hardness range: 6b-6h) Solvent resistance: the chemical reagent resistance of the paint film shall be determined in accordance with GB / T 1763-1979 (1989); the salt resistance of the paint film shall be determined in accordance with GB / T 1734-1993 by immersing 2 / 3 of the paint sample plate into 3% (mass fraction) of the salt water solution at room temperature, taking out the sample plate after 96 hours, drying it with filter paper after cleaning, and comparing with the reserved sample plate; the gasoline resistance of the paint film shall be determined in accordance with GB / T 1734-1993 Determination of adhesion: according to GB / T 9286-1988 (1998) cross cut test method for paint and varnish film Performance test results: 1 The influence of pigments and fillers on the heat resistance of the coating can be seen from table 1 that different pigments and fillers have a great influence on the heat resistance of the coating In series 1, titanium dioxide powder is easy to be powdered at 200 ℃, which can be improved by adding powdering improver, and the heat-resistant temperature can reach 250 ℃ The zinc powder began to melt at about 420 ℃, and the coating can withstand 400 ℃ The pigment chrome green in series 3 has very good heat resistance, which can even reach over 800 ℃ 2 The hardness of the coating is one of the important properties indicating the mechanical properties of the paint film See Table 2 for the hardness test results of the coating It can be seen from table 2 that the hardness of the three series of coatings has the same change trend With the increase of the ratio of pigment to base, the hardness of the coating increases; with the increase of the amount of silicone in the base resin, the hardness of the coating becomes worse 3 Chemical solvent resistance and corrosion resistance of the coating chemical corrosion resistance of the coating is an important index for the protection of the coating The following mainly tests the damage caused by the film resistance to contact with chemical medium, and the results are shown in Table 3 and table 4 It can be seen from table 3 that the salt water resistance of the coating is the best, and there is no bubble, discoloration and falling off after 96 h of salt water solution immersion, which shows that the salt water resistance of the coating has a great influence on the color base ratio of the coating Table 4 shows that the gasoline resistance of the coating is good, and only the silicone content of the base resin is 50 after soaking in 200 × gasoline for 96 h %Because of the good solvent resistance and chemical corrosion resistance of the silicone resin, the salt water resistance and solvent resistance of the coating are very good when the resin with high content of silicone is used as the base resin, while the water resistance and solvent resistance of the coating prepared with pure organosilane are general, mainly because the pure silicone resin is attached to the base material Poor strength 4 Adhesion of the coating the adhesion of the coating refers to the firmness of the combination of the paint film and the surface of the coated object through the action of physical and chemical forces It can be seen from table 5 that the higher the mass fraction of organosilicon in the base resin, the worse the adhesion of the obtained coating This is because the adhesion of polysiloxane on the metal surface is poor, while polyacrylate has better adhesion performance; the larger the ratio of pigment to base, the worse the adhesion of the coating because the adhesion of the coating mainly depends on the physical and chemical changes between the substrate and the substrate when the substrate film is formed, and the adhesion of the coating increases with the increase of the resin content of the substrate in the coating 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,
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.