Method for preparing high solid content aqueous polyurethane emulsion by continuous process
A technology of water-based polyurethane and polyurethane emulsion, which is applied in the field of high-solid content and low-viscosity sulfonic acid-type anionic water-based polyurethane emulsion, can solve the problems of low solid content of water-based polyurethane emulsion products, and achieve good heat resistance and high initial bonding strength Effect
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Example
[0058] example 1
[0059] Under the protection of dry nitrogen, 58g of polyoxypropylene glycol (N-210) after vacuum dehydration, 30g of isophorone isocyanate (IPDI), 3.7g of diethylene glycol (DEG); appropriate amount of solvent and catalyst 2 Dibutyltin laurate (T-12) and stannous octoate (T-9) are added to the reactor at one time, and the reaction is carried out by controlling a certain temperature under mechanical stirring. When the NCO content does not change, lower the system temperature to 20℃~50℃, slowly add 2.0 g of sulfonate hydrophilic chain extender to the prepolymer, and add a suitable amount of solvent to prevent excessive viscosity from causing coagulation. After reacting until the NCO content no longer changes, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque waterborne polyurethane emulsion. The obtained water-based polyurethane emulsion is distilled under red
Example
[0060] Example 2
[0061] Under the protection of dry nitrogen, 116g of polyoxypropylene glycol (N-220) after vacuum dehydration, 30g of isophorone isocyanate (IPDI), 3.0g of diethylene glycol (DEG), appropriate amount of solvent and catalyst 2 Dibutyltin laurate (T-12) and stannous octoate (T-9) are added to the reactor at one time, and the reaction is carried out by controlling a certain temperature under mechanical stirring. When the NCO content does not change, reduce the system temperature to 20℃~50℃, slowly add 2.6g of sulfonate hydrophilic chain extender to the prepolymer, and add a suitable amount of solvent to prevent excessive viscosity from causing coagulation. After reacting until the NCO content no longer changes, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque waterborne polyurethane emulsion. The obtained water-based polyurethane emulsion is distilled under re
Example
[0062] Example 3
[0063] Under the protection of dry nitrogen, 58g of polyhexylene adipate (PHA) with a hydroxyl value of 1.96mmol / g after vacuum dehydration, 30g of isophorone isocyanate (IPDI), and diethylene glycol (DEG) ) 3.7g, an appropriate amount of solvent and catalyst dibutyltin dilaurate (T-12) and stannous octoate (T-9) are added to the reactor at one time, and the reaction is carried out at a certain temperature under mechanical stirring at 100-105°C. When the reaction reaches a certain NCO content, reduce the temperature of the system to 20℃~50℃, slowly add 2.0g of sulfonate hydrophilic chain extender to the prepolymer, and add a suitable amount of solvent to prevent excessive viscosity from causing gel After reacting until the NCO content no longer changes, the system is cooled to room temperature, and then a metered amount of water is added under high shear force for emulsification to obtain a milky white opaque waterborne polyurethane emulsion. The obtained water-b
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