Preparation method of one-component solvent-free polyurethane waterproof coating
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A solvent-free polyurethane and waterproof coating technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as high cost and poor mechanical properties, and achieve low cost, excellent elongation at break, and excellent waterproof performance Effect
Active Publication Date: 2015-10-14
青岛中科润唐新材料科技有限公司
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[0005] The purpose of the present invention is to provide a method for preparing a one-component solvent-free polyurethane waterproof coating with high elongation at break, so as to solve the problems of poor mechanical properties and high cost of existing polyurethane waterproof coatings.
Method used
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Embodiment 1
[0024] Add 20g PE (Mn=2000, EO and PO randomly distributed, EO wt%=30%), 10g polyoxyethylene polyoxypropylene glyceryl ether (Mn=10000, EO wt%=10%, polyoxyethylene Ethylene and polyoxypropylene are block distribution), vacuum dehydration at 120°C for 2h, cool down to 50°C, add 4.0g of toluene diisocyanate, react at 50°C for 2h, cool down to room temperature, add 0.9g of didecyl catechol formate, Silicone defoamer 0.15g, tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol 0.03g, 2-hydroxy-4-methoxybenzophenone 0.03 g. Stir for 10 minutes, discharge, and seal for storage.
Embodiment 2
[0026] Add 20g PE (Mn=10000, BAB type block distribution, EO wt%=10%), 3.33g polyoxyethylene polyoxypropylene glyceryl ether (Mn=2000, EO wt%=30%, polyoxyethylene Ethylene and polyoxypropylene are block distribution), vacuum dehydration at 120°C for 2h, cool down to 50°C, add 3.13g of toluene diisocyanate, react at 80°C for 4h, cool down to room temperature, add 1.86g of didecyl catechol formate, Silicone-based defoamer 0.23g, tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol 0.23g, 2-hydroxy-4-methoxybenzophenone 0.23 g. Stir for 10 minutes, discharge, and seal for storage.
Embodiment 3
[0028] Add 20g PE (Mn=6000, EO wt%=20%), 5g polyoxyethylene polyoxypropylene glyceryl ether (Mn=6000, PEO wt%=20%), polyoxyethylene and polyoxypropylene into the reaction bottle Random distribution), vacuum dehydration at 120°C for 2h, cool down to 60°C, add 2.4g of toluene diisocyanate, react at 60°C for 3h, cool down to room temperature, add 1.5g of catechol dinonyl formate, silicone defoamer 0.17g, 0.17g of tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid)pentaerythritol, and 0.17g of 2-hydroxy-4-methoxybenzophenone. Stir for 10 minutes, discharge, and seal for storage.
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Abstract
The invention relates to a preparation method of a one-component solvent-free polyurethane waterproof coating. The preparation method is mainly characterized by comprising the following steps: adding mixed polyhydric alcohols of polyether diol and polyfunctional polyether polyol, which are mixed according to a certain mass ratio, into a reaction vessel; adding isocyanate after dehydrating and reacting at 50-80 DEG C for 1-4 h; cooling to room temperature; and adding pre-dried plasticizer, antifoaming agent, anti-oxidant and ultraviolet ray absorber and uniformly mixing to prepare the polyurethane waterproof coating. The preparation method has the following advantages: 1) the raw materials used are cheap and easily available, and a synthetic method is simple, efficient and low-cost and is easy for amplification of the operation process and realization of industrial production; and 2) water is used as a curing agent of polyurethane resin; and a compact polyurethane elastomer film can be formed after addition of 50-80% of water, uniform stirring and solidification during the construction, is nontoxic and environmentally friendly and has high safety. As a polyfunctional active group is introduced, a compact cross-linked network structure can be formed after the coating encounters water and is solidified. The coating has excellent mechanical properties (tensile strength of the film is greater than 4MPa and elongation at break is greater than 1000%), can be used as an excellent waterproof material, and has a wide application prospect.
Description
technical field [0001] The invention relates to a method for preparing an environment-friendly waterproof coating for the construction industry, in particular to a method for preparing a one-component solvent-free polyurethane waterproof coating with high tensile strength and high elongation at break. Background technique [0002] The extensive use of concrete in construction improves the quality of the building, but its non-waterproof (water seepage, water leakage) defects require waterproofing of its surface, especially in places where water can accumulate for a long time, such as the top of the building, the basement, and the toilet. , building waterproofing is particularly important. Currently commonly used waterproof coatings are polyurethane waterproof coatings, acrylic waterproof coatings, modified emulsified asphalt waterproof coatings, etc. Among them, the polyurethane waterproof coating has strong adaptability to the deformation of the cracks in the base layer d...
Claims
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Application Information
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