Continuous production system for preparing aqueous polyurethane dispersion, continuous production process of aqueous polyurethane dispersion and application of aqueous polyurethane dispersion

Abstract

The invention belongs to the technical field of continuous production of aqueous polyurethane dispersion and provides a continuous production system for preparing aqueous polyurethane dispersion, a continuous production process of the aqueous polyurethane dispersion and application of the aqueous polyurethane dispersion. The continuous production process comprises the following steps: (1) reactingpolyisocyanate with oligomer polyol in a first tubular reactor VR1 to obtain a prepolymer I, wherein the oligomer polyol is divided into four parts when the oligomer polyol is added into the VR1; (2)reacting the prepolymer I with a non-ionic hydrophilic compound in a second tubular reactor VR2 to obtain a prepolymer II, wherein the non-ionic hydrophilic compound is divided into three parts whenthe non-ionic hydrophilic compound is added into the VR2; (3) diluting the prepolymer II and a solvent in a VR3; (4) reacting the diluted prepolymer II with hydrophilic chain extending agent and smallmolecule diamine in a VR4; and (5) emulsifying and dispersing in a VR5. The process is capable of achieving rapid, efficient and continuous production of the aqueous polyurethane dispersion.

Description

technical field [0001] The invention belongs to the technical field of continuous production of water-based polyurethane dispersions, and in particular relates to a continuous production system for preparing water-based polyurethane dispersions, a continuous production process and application of water-based polyurethane dispersions. Background technique [0002] Water-based polyurethane dispersion uses water instead of organic solvents as the dispersion medium, does not contain volatile organic solvents (VOC), and is an odorless, non-toxic, green and environmentally friendly organic polymer material. During its use, water volatilizes to form a polyurethane film. Therefore, the film-former of the water-based polyurethane dispersion has the same excellent physical and chemical properties as the polyurethane material. [0003] Water-based polyurethane materials can obtain high-performance materials with different hardness and chemical resistance by adjusting formula and chemica...

AI Technical Summary

Problems solved by technology

However, the batch production process has significant disadvantages in the production of water-based polyurethane dispersions, which are as follows: (1) low production efficiency, high device vacancy rate, and high production costs; (2) excessive production dependence on labor and low automation; (3) The quality fluctuates greatly between product batches, and the defective rate is high

[0005] The continuous production process of water-based polyurethane dispersion can effectively overcome the problems caused by batch production. Patent document CN102633971A discloses a continuous production process of water-based polyurethane dispersion based on twin-screw reactor design. Polymerization, high-temperature dispersion process at 90-150°C; for water-based polyurethane systems, high-temperature pre-polymerization brings unpredictable side reactions, uncontrollable macromolecular structure, and high-temperature dispersion will make it very difficult to control the particle size of the emulsion during dispersion. The process temperature is high, and the final emulsion needs to be cooled to obtain the finished emulsion, and the production cost is high because of the high energy consumption of the process

Patent document WO2017 / 009161A1 discloses a continuous dispersing device based on a static mixer, but there is no mention of the continuous production process of the prepolymerization process

[0006] In addition, the simple tubular reactor has advantages for the liquid phase system with low reaction viscosity, but the water-based polyurethane prepolymer gradually increases from low viscosity to high viscosity as the reaction progresses. If no suitable internal components are installed, The mixing effect and reaction rate of the tubular reactor in continuous production are affected, the molecular weight distribution of the product is very wide, the reaction rate is very slow, and the product performance is greatly reduced

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