echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Study on the effect of wetting dispersant on the performance of flame retardant polymer emulsion waterproof coating

    Study on the effect of wetting dispersant on the performance of flame retardant polymer emulsion waterproof coating

    • Last Update: 2021-01-18
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    China Paint Online News News
    Li Jugang 1, Wang Yong 2, Huang Haiyan 2, Zhao Chunlin 1 (1. Suzhou Gusu New Building Materials Co., Ltd., Jiangsu Province High-Performance Building Materials Engineering Technology Research Center, Suzhou, Jiangsu 215129; 2. Suzhou Construction Engineering Quality Testing Center Co., Ltd., Suzhou, Jiangsu Province 215129)
    Summary: The dispersion effect of different types of wetting dispersants on flame retardants such as trioxide, decablybized ethane and aluminum hydroxide was examined, and the effect of wetting dispersants on the surface performance, waterproofing performance and flame retardant properties of flame retardant-type polymer emulsions was analyzed. The results showed that the surface performance, waterproofing performance and flame retardant performance of the waterproof coating of the flame retardant polymer emulsion of the ammonium acrylic salt wetting dispersant and the inlay copolymer polymer dispersant were combined.
    key words: polymer emulsion waterproof coating; wetting dispersant; flame retardant; performance impact
    article number: 1007-497X (2015)-02-0003-06 In the figure classification number: TU502; TU56-1.65 Document identification code: A
    In recent years, due to the frequent fire accidents caused by building materials problems, people have paid great attention to improve the flame retardant properties of building materials is an urgent task. In the field of building waterproof coatings, the research of flame retardant waterproof coatings has become a hot topic. Most of these coatings use trioxide/decabromodylene as flame retardants, but due to the different surface properties of trioxide and decaBDE, it is difficult to disperse in water-based coatings, which in turn affects the performance of coatings. In this paper, the effects of wetting dispersants on the water-resistant coating properties of trioxide/debrominated ethane flame retardant polymer emulsions are studied in order to contribute to and help the development of flame retardant polymer emulsion waterproof coatings.
    1. Experimental part
    1.1 Raw materials
    acrylate emulsion, redstone titanium white powder, heavy calcium carbonate, precipitated vanadium sulfate, trioxide, aluminum hydroxide, decaBDE, Phosphate wetting dispersant A, sodium acrylic salt wetting dispersant B, ammonium acrylic salt wetting dispersant C, inlay copolymer polymer polymer wetting dispersant D and other additives, the above raw materials are domestic industrial-grade commercial products.
    1.2 Test Method
    1.2.1 Dispersion System
    Dispersion Performance: Tested in accordance with GB/T 21089.1-2007 Part 1 of the Test Method for the Application Performance of Water-based Additives in Building Coatings: Dispersants, Desobbists and Thickeners.
    Dispersion stability performance: the specified amount of dispersant into 50 mL of water, low-speed stirring with 20 g flame retardant, 600 r/min speed stirring 20 min to make the dispersion, in the standard conditions (temperature (23±2) degrees C, humidity 50% ±5%, the same below) under the static 48 h, and then observe the stratification.
    1.2.2 Coating System
    1.2.2.1 Preparation of waterproof coatings
    The components are weighed accurately by the quality ratio of the formula design, with water, partial emulsion, wetting dispersants, defocusing agents, titanium powder, debrominated ethane and trioxide, at a low speed of 15 00 to 2,000 r/min under high-speed dispersion of about 30 min, the speed will be adjusted to 500 to 800 r/min, add the remaining desmoulator, emulsion, precipitation of calcium sulfate, heavy calcium carbonate and other additives, stirring 30 min, adjust the viscosity, over-screening material will be flame retardant polymer emulsion waterproof coating.
    1.2.2.2 Fineness Test the fineness of the waterproof coating in accordance with the provisions of GB/T 6753.1-2007 "Color paint, varnish and printing ink grinding fineness determination", the fine plate specification is 100 m.
    1.2.2.3 Waterproof performance
    water resistance is tested in accordance with the provisions of JC/T 864-2008 Polymer Emulsion Building Waterproof Coatings.
    1.2.2.4 Flame retardant performance
    combined with GB/T 15542.2-1995 "Finished fireproof coating fire performance classification and test method" in the relevant test methods, according to laboratory conditions, to determine the coating The test method of flame retardant performance is as follows: coating on three-layer plycing plates with a size of 200 mm×200 mm, dry film thickness of 100 to 150 m, making 3 test pieces and maintaining 7 d under standard conditions. Place the coating face down, parallel to the fuel cup with 5 mm chemical grade waterless ethanol, in accordance with the C.2.3 regulations in GB 12441-2005 Finish Fire Protection Coatings, so that the fuel cup is on the upper edge The nearest vertical distance to the fire surface of the test piece is 25 mm, igniting alcohol, using a stopwatch to determine the time of carbonization on the back of the three splints at the fire, with the average of the 3 test pieces as the carbonization time, the longer the time, the better the flame retardant performance.
    1.2.2.5 Combustion Performance
    In accordance with the provisions of 5.4.2 in JC/T 864-2008 Polymer Emulsion Building Waterproof Coatings, 3 test pieces with a specification of 100 mm×25 mm are prepared and maintained. Under standard conditions, light the alcohol lamp, clamp one end of the test piece with tweezers, make it sagging freely, move the other end of the test piece to the center of the alcohol lamp flame to maintain 10 s, remove the alcohol lamp, observe whether the test piece is off the flame, and observe whether the coating film drips.
    1.2.2.6 Water Resistance
    Test the water resistance of waterproof coatings in accordance with the method specified in GB/T 9755-2001 "Synthetic Resin Emulsion Exterior Coatings" 5.9.
    2 Results and Analysis
    2.1 Effect of wetting dispersants on flame retardant dispersion performance and stability
    The seteration method, Y/4 position determination, particle size determination and other methods, the other is indirect measurement method, with the optical or fluid properties associated with pigment dispersion to evaluate the degree of dispersion of pigments. In this study, the wetting dispersion and fluidity of various wetting dispersants were evaluated by measuring the viscosity of the dispersion slurry.
    2.1.1 Effect of wetting dispersants on flame retardant dispersion
    the ratio of water 250 g, trioxide 150 g, aluminum hydroxide 100 g, dispersant 2.5 g was tested by GB/T 21089.1-2007 in 5.1, as shown in Table 1. The ratio of 350 g of water, 150g of decablybate ethane and 1.5 g of dispersant was tested on the ratio of GB/T 21089.1 to 5.1 of 2007, with results as shown in Table 2.
    2.1.2 Effect of wetting dispersants on the dispersion stability of flame retardants
    With trioxide: aluminum hydroxide: decaBDE: 1:1:2 (mass ratio, the same below) as flame retardants, the stability of flame retardants was examined by different dispersants in accordance with the provisions of 1.2.1, and the results were seen in Table 3.
    2.1.3 The effect of wetting dispersants on flame retardant dispersion performance and stability
    The test results of Table 1-3 show that the dispersion and dispersion stability of wetting dispersants A, B, C and D on inorganic flame retardants are gradually reduced, while the dispersion and dispersion stability of organic flame retardants are gradually enhanced, due to differences in the surface properties of two types of flame retardants and the molecular structure of each dispersant.
    Inorganic flame retardants and inorganic powders belong to polar or strong polar hydrophobic minerals, organic flame retardants have hydrophobic non-polar surfaces, the surface properties of the two are very different, poor compatible, so it is difficult to evenly disperse in a single wetting dispersant system.
    wetting dispersant A is an inormeric lysate of polyphosphate, and its dispersion is mainly manifested as: reducing the potenteance of the mineral surface and increasing the electrostectric repulsion between mineral particles. In the dispersion of flame retardants, the charged ions, which mainly rely on flame retardants, form a double-charged layer with the dissoidation of the dispersant molecules, which constitute the stability of the dispersion system due to the charge refringing force. However, this rebuke force is greatly affected by the pH value of the dispersed system, the size of the dispersed particles, the specific gravity, and the rate of subsidion, so the stability of the dispersion system is temporary and fragile. As shown in Table 1 and Table 3, the dispersion anti-flocculation of wetting dispersant A is poor, and the system is very easy to re-coarse and precipitate. In addition, since the action of such dispersants is based on polar charged adsorption, there is little dispersion capacity for non-polar organic flame retardants.
    wetting dispersants B and C are acrylic anion surfactants, and their action is mainly dual-layer and spatial resistance. In the dispersion system, due to the effect of similar compatible principle, the surface of inorgable flame retardant absorbs the dispersant molecule to form a double electron layer. A double-charged layer formed by charged particles, which causes the charge between the adjacent two particles to produce a rebuke force, which causes the particles to be steadily dispersed. Acrylic dispersants in the system, one end is a carboxyl, one end is a long-chain alkyl, the base end is adsorbed to the surface of inorgeable flame retardants to form a protective barrier layer. When two particles with an adsorption layer approach each other and the adsorption layer overlaps, there are two effects: one is the osmosis pressure effect or the anti-solvent effect; From Table 1 and Table 3, it can be seen that wetting dispersants B and C have better dispersion and dispersion stability properties for inorgeable flame retardants, which is the effect of acrylic wetting dispersants on the double electron layer of particles and spatial resistance; 2, Table 3 can be seen, wetting dispersant B, C on the organic flame retardant dispersion effect is poor, this is due to the organic flame retardant surface is non-polar, so that acrylic wetting dispersant double-layer action and spatial resistance can not play.
    wetting dispersant D is a segment co-polymer polymer. Because the surface of organic flame retardant is non-polar, it is generally difficult to produce strong ion bonding, and the insertion co-polymer wetting dispersant from both ends for hydro-friendly dispersion chain joint, the middle segment for the active base of the non-polar pro-pigment adsorption section to form the ABA-type segment co-polymer, so according to similar compatible principle, segment B is absorbed by the active base on the surface of the organic flame retardant, segment A dispersion in the water. Therefore, wetting dispersant D can have a good dispersion effect on organic flame retardants, while the dispersion effect on inorganic flame retardants is poor.
    wetting dispersants C, D according to 1:1 re-use can achieve a good dispersion effect. Wetting dispersant C is ion type, wetting dispersant D is non-ion type, the surface characteristics of the two adsorption particles are different, can be fully wetting and dispersing different types of flame retardants, and will not be due to competition on the same particle surface and reduce the wetting dispersion efficiency.
    2.2 Effects of wetting dispersants on the performance of flame retardant polymer emulsion waterproof coatings
    2.2.1 Effects of wetting dispersants on the surface performance of waterproof coatings
    2.2.1 Preparation of flame retardant-type polymer emulsion waterproof coating and performance testing, respectively, to investigate the wetting dispersant in the same amount of paint surface, viscosity, fineness and water resistance effect, the test results are shown in Table 5.
    From Table 5, it can be seen that the re-allocation of wetting dispersants C and D has greatly improved the appearance, viscosity, fineness and other properties of flame retardant-type polymer emulsion waterproof coatings, because the re-displuence of two wetting dispersants makes organic flame retardants, inorganic flame retardants and inorganic pigments in the coating have good dispersion effect. And the separate use of wetting dispersants A, B, C or D can only on inorganic flame retardants, inorganic pigment fillers and organic flame retardants in one of the good wetting dispersion effect, so there will be appearance rough or even back rough, high viscosity, greater fineness, poor water resistance and other ills. Among them, the difference in water resistance of waterproof coatings made with wetting dispersant B and C is due to the presence of soluble sodium ions in the coating film using wetting dispersant B, which reduces water resistance.
    2.2.2 Effect of wetting dispersants on the mechanical properties of waterproof coatings
    Using the basic formula, the effects of wetting dispersants on the stretch strength, fracture elongation and low gentleness of waterproof coatings at the same amount were examined, and the results were shown in Table 6. The electrometric properties of
    polymer emulsion waterproof coatings are not only affected by the type, dosage and volume concentration of polymer lotions, but also by the powder dispersion state, i.e. wetting dispersants, which are more obvious in the flame retardant-resistant polymer emulsion coatings with inorganic-organic powder complex system. From Table 6, it can be seen that the waterproof coating with wetting dispersant A has poor performance, because wetting dispersant A has a poor wetting dispersion effect on the powder, and there is almost no dispersion effect on debrominated ethylene, resulting in water-emulsion phase in the waterproof coating system not fully wetting flame retardants, pigments, and high in the coating film The polymer failed to wrap flame retardants and pigments, which made the coating film manifest it as a high-mass, flame retardant particles, pigment particles in a state of separation and separation, and the elasticity and flexibility of the high-mass can not be continuously expressed, resulting in poor mechanical properties such as stretch strength, fracture elongation and low gentleness of the coating film. Wetting dispersants B, C and D although the performance of waterproof coatings has improved, but can not take into account the inorganic, organic particles wetting dispersion. When the use of wetting dispersant C-D compounding use, waterproof coating inorganic, organic particles are fully moisturized and good dispersion, so that the high-polymer in the coating film to form a more complete elastomer continuous phase, the maximum formation of the so-called "sea-island" structure, so that waterproof paint shows excellent performance.
    2.3 Effect of wetting dispersant on the flame retardant-resistant polymer emulsion waterproof coating flame retardant performance
    Using the basic formula, the effect of different wetting dispersants on the carbonization time of waterproof coating at the same amount was examined separately, and the test was carried out according to 1.2.2.4, the results of which are shown in Figure 1.
    the basic formula, the effect of different wetting dispersants on the combustion performance of the coating film was examined in the same amount, and the results were tested according to 1.2.2.5, the results of which are shown in Table 7.
    decaBDE is a substitute for decaBDE
    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.