The development of silicone-acrylic water-based rust-resistant anti-rust coating

China Paint Online News News
Liu Yuxin, Lu Yaohui, Wei Shixuan, Wang Xiaoming (Armoured Engineering Academy Equipment Remanding Technology National Defense Science and Technology Key Laboratory, Beijing 100072)
Summary: Silicone propylene emulsion for the preparation of new water-based rust-proof coatings for film. Using orthosis experiment method, the content of emulsion, stabilizer, rust-proof pigment and buffer is taken as a factor, and 3 sets of 3 horizontal orthosis experiments are designed, through the testing and analysis of coating and coating properties, the water-based rust-proof coating formula with good performance is screened, and the performance of pure propylene and phenyl-propylene rust-proof coating is compared. The test results show that the comprehensive performance of silicon propylene rust-proof coating is better than that of pure propylene and PHEN rust-proof coating.
key words: vinyl silicone oil; silicone propylene emulsion; rust-resistant coatings; water-based coatings
In the figure classification number: TQ 632.4 Document identification code: A article number: 1009-1696 (2014) 02-0001-04
0 Introduction
Rust coating to remove rust, oil removal, water removal and other surface treatment processes, in a certain rust surface can be directly constructed, not only can significantly reduce the cost of coating, but also greatly simplify the painting process, thereby reducing labor intensity, reduce rust dust on the human body harm and environmental pollution. In recent years, the research of high-performance, low-polluting water-based rust coating is very active, the selected base materials are acetate emulsion, PHEN emulsion, pure propylene emulsion, etc., but in practice, due to the limitations of its own structure, there are still some shortcomings. In order to better improve the comprehensive performance of rust-resistant coatings, silicone and acrylic copolymers are used to make acrylic-type large molecules as the main chain, side chain with alkyl or hydroxyl silane or polysilicon oxide silicone modified acrylic water-based rust coating. The coating has the effect of making active rust inert and solid, so that rust is stable and can attach to each other well, so as to achieve a good anti-rust effect.
1. Experimental part
1.1 Synthesis of silicone propylene emulsion
This paper uses vinyl triethyl silica oil to make a modified silicone emulsion of acrylic. The emulsion polymerization process includes not only the copolymer reaction of acrylic monomers, the copolymer reaction of silicone oxygenane and acrylates monomers, but also the alkyl hydrolytic production of silicone alcohol in silica and the shrinking of silicone to produce a shrink. The final emulsion is a mixture of copolymers of acrylic, copolymers of acrylic and silicone oxane, ermethymers of sioxane, and hydrolytic extracts of sioxane. When the silicone propylene emulsion is dried into a film, sioxane hydrolysis and shrinking can form a solid cross-linking -Si-O-Si-stereoscopic network structure between polymer molecules, as well as between polymers and substrates, so that the paint film has strong water resistance and adhesion. Silicon propylene co-polymers are crossed online as shown in Figure 1.
the formula (mass fraction) for the synthetic silicone emulsion (theoretical solid content of 47%), as shown in Table 1.
1.2 Preparation of water-based rust-resistant anti-rust coating
with the development of silicone propylene emulsion as a film, non-toxic and efficient organic converter and inorganic stabilizer as the main component of rust-proof, preferably zinc phosphate and iron oxide red composition rust-proof pigment system Sodium nitrite, dispersant TM-950, humidifier X-16, desolation agent QF246, buffer AMP-95, talcum powder, alcohol ester-12, leveling agent, thickener, deionized water were added. After optimizing the combination of a good mechanical performance, non-toxic, non-combustible, good adhesion, with good rust resistance of water-based rust coating.
the preparation process of the 1.2.1 coating
120 mm ×50 mm horse mouth iron as a model for this experimental test. There is no need to over-surface the test model to remove the rust.
by reference to GB/T 1727-1992 "Paint Film General Preparation Law" and GB/T9152-1988 "Preparation of architectural coating coating test board" requirements for coating. 2 channels are coated by brush coating, the first coating amount is (150±20) g/m2 (based on± 55% solid parts of paint); The application interval is 4 h, after applying the final coating, the model paints up, drying 7 d at (23±2) degrees C, (50±5) % relative humidity.
1.2.2 Performance test
(1) drying time: table dry time and dry time are measured according to the conventional method.
(2) Adhesion: Using the QFZ-II. type adhesion tester, the rating is based on GB/T 1720-1979 (1989).
(3) Water resistance and salt water resistance: according to GB/T 10834-2008 "ship paint salt water resistance determination salt water and hot salt water immersion method" to determine.
(4) hardness: the pencil hardness method is used for determination.
(5) masking force: measured by GB/T 1726-1979 (1989).
(6) impact resistance: measured by GB/T 1732-1993.
(7) neutral salt spray experiment: put the test pieces into the salt mist box and measure them according to the GB/T 1771-1991 method. After the continuous spray of 8 h was used, the stop spray 16 h was 1 cycle, with a total length of 240 h.
1.2.3 Orthodectant Experiment
This paper uses 4 factors 3 horizontal orthosotic experiment method, using L9 (34) orthosectant table to conduct the experiment, selected the following 4 factors: A-emulsion content, B-inorganic stabilizer content, C-iron oxide red content, D-AMP-95 buffer content. Each factor is taken at 3 levels and 9 groups of experiments are conducted.
by observing the appearance of the coating and testing the performance indicators, the following conclusions are drawn: 1 , 2 , 3 , 6 , the formula of the various excellent performance, can meet the relevant national standards. According to the comprehensive equilibrium method of multi-indicator orthosectance experiment polar difference analysis, the better coating formula is 1 and 3 (Table 3), and the results are also verified in the experiment.
1.3 Comparison of different film-based water-based rust-proof coatings
In the case of emulsions, pigments, dispersants and thickeners, the amount of pure propylene emulsion, phenyl-propylene emulsion and silicone-propylene emulsions are used as films, and 3 different sets of water-based rust-proof coatings are prepared according to the formula of 1. Preparation process and test methods as described earlier, and 3 sets of coatings for performance testing, experimental results: silicon propylene rust-proof coating water resistance, salt water resistance and impact resistance are better than pure propylene and phenyl propylene rust-proof coatings, its corrosion resistance is good, not easy to deform and crack, with good flexibility and adhesion to the substrate.
2. Conclusion
to silicone propylene emulsion for the film preparation of water-based rust-proof paint, the use of orthosis experiment optimization screening paint formula, its salt spray resistance, salt water resistance, hardness, adhesion, impact resistance and water resistance are in line with national standards, and can be coated with rust. Its comprehensive performance is better than that of phenylpropan rust-proof coatings and pure propylene rust-proof coatings.
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