Method for preparing single-component polyurethane coating by coupling agent-modified fly ash
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A technology of polyurethane coating and fly ash is applied in the field of polyurethane coating to achieve the effects of improving elongation at break, reducing production cost and reducing reaction time
Inactive Publication Date: 2020-12-22
HENAN TECHN COLLEGE OF CONSTR
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Commonly used powdery inorganic fillers include talcum powder, kaolin, clay, light or heavy calcium carbonate, asbestos, fly ash, etc., but there are relatively few studies on using fly ash as a powdery filler to prepare polyurethane coatings. Moreover, most of the existing researches are applied to the preparation of two-component polyurethane coatings, and have not yet been involved in one-component polyurethane coatings.
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Embodiment 1
[0023] A kind of coupling agent modified fly ash prepares the method for one-component polyurethane coating, comprises the steps:
[0024] (1) Preparation of silane coupling agent solution: Take 60-90mL of water-ethanol solution with a mass concentration of 75-95%, add 2-4g of silane coupling agent, and reflux at 75-95°C for 1.5-2.5h, And use hydrochloric acid to adjust the pH value of the solution to 3.5-4.5, after the reflux is completed, naturally cool to room temperature to obtain a silane coupling agent solution;
[0025] (2) Preparation of modified fly ash: Take 38-42mL of the silane coupling agent solution, add 0.3-0.4g of fly ash, reflux at a constant temperature of 98-102°C for 50-70min, add an appropriate amount of NaOH to adjust the pH to neutral, dry at 75-85°C, and grind into powder to obtain modified fly ash;
[0026] (3) Preparation of one-component polyurethane: Add 14-18 g of Mn=2000 polyol POL-356 and 3-5 g of Mn=600 polyol POL-3195 into 25-35 mL of ethyl ac...
Embodiment 2
[0030] A kind of coupling agent modified fly ash prepares the method for one-component polyurethane coating, comprises the steps:
[0031] (1) Preparation of silane coupling agent solution: Take 75mL of water-ethanol solution with a mass concentration of 85%, add 3.000g of silane coupling agent, reflux at 85°C for 2h, and adjust the pH value of the solution to 4 with hydrochloric acid, After reflux finishes, cool down to room temperature naturally to obtain a silane coupling agent solution;
[0032] (2) Preparation of modified fly ash: take 40mL of the silane coupling agent solution, add 0.3500g of fly ash, reflux at a constant temperature of 100°C for 60min, add an appropriate amount of NaOH to adjust the pH to neutral, at 80°C Dry and grind into powder to obtain modified fly ash;
[0033] (3) Preparation of one-component polyurethane: Add 16g of Mn=2000 polyol POL-356 and 4g of Mn=600 polyol POL-3195 into 30mL of ethyl acetate solution, reflux and stir in a constant tempera...
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Abstract
The invention provides a method for preparing a single-component polyurethane coating from coupling agent modified fly ash. The method comprises steps as follows: 14-18 g of Mn=2000 polyols POL-356 and 3-5 g of Mn=600 polyols POL-3195 are added to 25-35 mL of an ethyl acetate solution, and thermostatic waterbath and backflow stirring are performed at 42-48 DEG C; 2.5-3.5 g of an anhydrous toluene-2,4-diisocyanate solution is added, and after the reaction is performed for 20-40 min, the temperature is increased to 58-62 DEG C; 5-7 drops of a catalyst are dropwise added, after the reaction is performed for 100-140 min, 2-4 g of the modified fly ash is added, a mixture is subjected to a reaction for 58-62 min, 0.15-0.25 g of a 1,4-butanediol solution is dropwise added, after the reaction is performed continuously for 2-3 h, a product is cooled, and the single-component polyurethane coating is obtained. According to the method for preparing the single-component polyurethane coating from the coupling agent modified fly ash, elongation at break, tensile strength, tear strength, stability and film-forming property of the single-component polyurethane coating can be improved effectively, production cost is reduced, and the fly ash is effectively utilized.
Description
technical field [0001] The invention relates to the technical field of polyurethane coatings, in particular to a method for preparing single-component polyurethane coatings by modifying fly ash with a coupling agent. Background technique [0002] At present, polyurethane coatings have been widely recognized and applied in the construction industry because of their excellent performance and moderate price. Polyurethane coatings are divided into two-component polyurethane coatings and one-component polyurethane coatings. Compared with two-component polyurethane coatings, one-component polyurethane coatings are more popular because of their low odor, environmental protection, convenient and quick construction, and reasonable prices. . However, most of the existing single-component and two-component polyurethane waterproof coating products in the domestic market are filled with fillers to varying degrees. Adding fillers can play a reinforcing role, improve the mechanical proper...
Claims
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