A kind of preparation method and application of polyurethane-acrylate water-repellent agent
An acrylic and polyurethane technology, which is applied in the direction of repelling fibers to liquids, fiber processing, textiles and papermaking, etc., can solve the problems of limiting the application of water repellent agents and the inability of water repellent agents to cover materials with low surface energy, avoiding the Reduced water repellency, improved physical and chemical properties, improved compatibility
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Embodiment 1
[0053] Prepare a kind of polyurethane-acrylic acid ester water-repellent agent and finish fabric according to the following steps:
[0054] Preparation of polyurethane-acrylate water repellent:
[0055] Preparation of polyurethane self-emulsion:
[0056] (1) Polytetrahydrofuran (Mn=850) (accounting for 92% of the total mass of hydroxyl-containing monomers), butylene glycol (accounting for 6% of the total mass of hydroxyl-containing monomers), 2,2-dimethylolbutanoic acid (accounting for 2% of the total mass of hydroxyl-containing monomers) was vacuum-dried at 50° C. to remove water. In the presence of nitrogen protection and catalyst dibutyltin dilaurate (accounting for 0.2% of the total monomer mass participating in the reaction), isophorone diisocyanate is slowly added dropwise to the 2,2 -Dimethylol butyric acid, in the mixed solution (the molar ratios of isocyanate and hydroxyl groups are 1.3, 1.6, 1.9, 2.2 respectively), the reaction temperature is 50°C, and the -NCO con...
Embodiment 2
[0073] Preparation of polyurethane self-emulsion: select the molar ratio of isocyanate and hydroxyl to be 1.3, and refer to Example 1 for other conditions to prepare polyurethane self-emulsion
[0074] Acrylate and water-based polyurethane self-emulsion reaction to prepare water-repellent agent:
[0075](1) The molar ratios of hexyl acrylate: methyl methacrylate: octyl methacrylate are 1:1:1, 2:1:0, 1:2:0, 0:2:1, 0:1 : 2 (the mass ratio of the total mass of acrylate monomer to the solid content in polyurethane self-emulsion is 1:1). Take 2 / 3 of the water-based polyurethane self-emulsion, raise the temperature to 40°C, add hexyl acrylate dropwise, and stir at a high speed of 3000r / min for 15 minutes, so that the hexyl acrylate monomer is fully pre-emulsified, and pre-emulsion A is obtained for future use. Add methyl methacrylate and octyl methacrylate monomers dropwise to 1 / 3 of the aqueous polyurethane emulsion, and stir at a high speed of 2000r / min for 10min to obtain pre-em...
Embodiment 3
[0086] Prepare a kind of polyurethane-acrylic acid ester water-repellent agent and finish fabric according to the following steps:
[0087] Preparation of polyurethane-acrylate water repellent:
[0088] Preparation of polyurethane self-emulsion:
[0089] (1) N-methyldiethanolamine (accounting for 10% of the total mass of hydroxyl-containing monomers), polypropylene glycol (Mn=400) (accounting for 76% of the total mass of hydroxyl-containing monomers), ethylene glycol (accounting for 10% of the total mass of hydroxyl-containing monomers), 14% of the total mass of the monomer) was vacuum-dried at 60° C. to remove water. In the presence of nitrogen protection and catalyst dibutyltin dilaurate (accounting for 0.2% of the total monomer mass participating in the reaction), 1,6-hexamethylene diisocyanate was slowly added dropwise to the mixture containing polypropylene glycol and 35% N-methyldiethanolamine In the mixed solution (the molar ratio of isocyanate to hydroxyl is 2.2), th...
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