A kind of two-component polyureide-based building sealant and preparation method thereof
A polyureide-based and sealant technology, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, polymer adhesive additives, etc., can solve problems such as water vapor sensitivity, and achieve simple production processes, uniform and dense products, and sealing Good waterproof effect
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[0044] Another aspect of the present invention provides the preparation method of above-mentioned two-component polyureide-based building sealant, and this preparation method comprises:
[0045] Preparation of component A: uniformly mixing polycarbodiimide with an optional polymer containing at least two acidic functional groups, a thixotropic agent, a plasticizer and a filler to obtain the component A;
[0046] Preparation of component B: uniformly mixing a polymer containing at least two acidic functional groups, a filler, a catalyst and optional chain extenders, plasticizers, thixotropic agents, pigments and auxiliary agents to obtain the component B.
[0047] The two-component polyurea building sealant of the present invention can be quickly solidified after the two components are fully mixed, and can be used after being stirred on site; or packaged into a double-tube product and extruded with a special two-component glue gun, through a static mixing head Use after mixing ...
Embodiment 1
[0054] This example provides a two-component self-leveling low-modulus polyureide-based building sealant. The specific preparation method is as follows:
[0055] Preparation of component A: Weigh 10 parts of polycarbodiimide and 20 parts of polyether polyol 1000LM by mass parts, add to the reaction kettle, stir evenly at room temperature, add 20 parts of light calcium carbonate, fully stir evenly, and vacuum Remove air bubbles, and discharge to make component A for later use.
[0056] Preparation of component B: 20 parts of dimer fatty acid (weight average molecular weight: 560), 5 parts of acetyl tri-n-butyl citrate, 23.5 parts of light calcium carbonate, 1 part of carbon black, catalyst dilauric acid in parts by mass 0.5 parts of dibutyltin, stirred evenly at room temperature, discharged for later use.
[0057] Wherein, the polycarbodiimide is made by condensation reaction of toluene diisocyanate under the catalysis of organic phosphine, and is terminated with monoisocyan...
Embodiment 2
[0060] This example provides a two-component thixotropic low-modulus polyureide-based sealant. The specific preparation method is as follows:
[0061] Preparation of component A: Weigh 10 parts of polycarbodiimide and 10 parts of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate according to parts by mass, add them to the reaction kettle, and Stir evenly, add 27 parts of heavy calcium and 3 parts of polyamide wax, stir evenly, and remove air bubbles in a vacuum, then pour the material into the two-component packaging tube A for later use.
[0062] Preparation of component B: mix 20 parts of dimer fatty acid (weight-average molecular weight: 560), 0.4 parts of chain extender phthalic acid, and 6 parts of phenyl alkyl sulfonate in parts by mass, stir evenly at room temperature, add light 18.5 parts of calcium carbonate, 3 parts of carbon black, stir evenly, add 0.1 part of catalyst tin acetate, 2 parts of phenyl alkylsulfonate, stir evenly at room temperature, discharge the material...
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