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Continuous solvent-free aqueous polyurethane dispersion, and preparation method and application thereof

A water-based polyurethane dispersion technology, applied in the field of continuous solvent-free water-based polyurethane dispersion and its preparation and application, can solve the problem of not involving urea-based structural reactions, the inability to really prepare water-based polyurethane dispersions, and the low molecular weight of water-based polyurethane dispersions Solvent and other issues, to improve competitiveness, improve production efficiency and reduce production costs

Inactive Publication Date: 2018-04-13
SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned processes solve the defect of small molecular weight of water-based polyurethane dispersion and the simple recovery of solvent, but they do not involve how to react the urea group structure into polyurethane, and the dispersing and emulsifying process still cannot get rid of the dependence on solvent, so it cannot be really prepared Waterborne polyurethane dispersion that is environmentally friendly, high performance and high added value

Method used

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  • Continuous solvent-free aqueous polyurethane dispersion, and preparation method and application thereof
  • Continuous solvent-free aqueous polyurethane dispersion, and preparation method and application thereof
  • Continuous solvent-free aqueous polyurethane dispersion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Formula: (percentage by weight)

[0046]

[0047]

[0048] Preparation:

[0049] (1) Mix polytetrahydrofuran diol (Mn=2000), dimethylol butyric acid, and 2-methylol-1,3-propanediol to 80°C, add catalyst stannous octoate, 4,4-diphenylmethane The temperature of the isocyanate (MDI) is raised to 80°C, the above two are respectively passed through the gear metering pump and the flow meter, and the mixing head is fed at a speed of 250rpm, L / D=30, and the temperature is 120°C, 130°C, 140°C, 150°C, 150°C, 160°C, 210°C twin-screw reactor reaction, residence time 0.5min;

[0050] (2) Through the melt gear pump, the temperature is 150°C and the rotating speed is 1500rpm in the shear pump, and at the same time, the temperature is 150°C, the pressure is 0.5Mpa, and the concentration is 1.6%wt triethylamine aqueous solution is also injected into the shear pump. Cut for 4 minutes;

[0051] (3) Cool down to 30° C. with a heat exchanger, reduce the pressure to normal pressure,...

Embodiment 2

[0053] Formula: (mass percentage)

[0054]

[0055] Preparation:

[0056] (1) Mix polytetrahydrofuran diol (Mn=2000), dimethylolpropionic acid, and 1,4-butanediol to 60°C, add the catalyst zinc isooctanoate, and heat up toluene diisocyanate (TDI) to 60°C, The above two are injected through the gear metering pump and the flow meter respectively through the mixing head with a rotation speed of 200rpm, L / D=56, and temperatures of 80°C, 100°C, 130°C, 140°C, 150°C, 170°C, and 215°C. Twin-screw reactor reaction, residence time 2min;

[0057] (2) Through the melt gear pump, the temperature is 120°C and the rotating speed is 1000rpm in the shear pump. At the same time, the temperature is 120°C, the pressure is 0.2Mpa and the concentration of 2.1%wt triethylamine is also injected into the shear pump. 5min;

[0058] (3) The temperature is lowered to 50° C. by a heat exchanger, and the pressure is lowered to normal pressure to collect in a stainless steel storage tank. After the co...

Embodiment 3

[0060] Formula: (percentage by weight)

[0061]

[0062] Preparation:

[0063] (1) Mix polytetrahydrofuran diol (Mn=2000), dimethylol butyric acid, and 2-methylol-1,3-propanediol to 80°C, add catalyst stannous octoate, 4,4-diphenylmethane The isocyanate (MDI) is heated up to 80°C, and the above two are respectively injected through the gear metering pump and the flow meter through the mixing head. 150°C, 170°C, 215°C twin-screw reactor reaction, residence time 1min;

[0064] (2) Through the melt gear pump, it is injected into the shear pump with a temperature of 150°C and a rotating speed of 1500rpm. At the same time, the aqueous solution of triethylamine with a temperature of 150°C, a pressure of 0.5Mpa, and a concentration of 1.4%wt is also injected into the shear pump. Cut for 4 minutes;

[0065] (3) Cool down to 30° C. with a heat exchanger, reduce the pressure to normal pressure, and collect it in a stainless steel storage tank. After the collection is full, stir fo...

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Abstract

The invention discloses a continuous solvent-free aqueous polyurethane dispersion, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) preheating polymer diol, diisocyanate, small-molecular diol, a low-melting point hydroxy-diterminated "Y"-type side chain hydrophilic chain extender and a catalyst, conveying the preheated materials into amixer, dispersing and mixing the materials, conveying the obtained mixture into a twin-screw reactor, and carrying out a reaction to obtain a polyurethane melt; (2) injecting the polyurethane melt into a shear pump, injecting water or water containing a neutralizing agent into the shear pump, and carrying out shear dispersing to obtain an aqueous polyurethane dispersion; and (3) carrying out cooling and pressure reduction on the aqueous polyurethane dispersion to obtain the solvent-free aqueous polyurethane dispersion. The method has the advantages of greenness, environmental protection, simple and efficient process, realization of the time from feeding to yielding being 30-60 min, improvement of the production efficiency and the stability of product batches, and realization of further reduction of the production cost and improvement of the product competitiveness due to no solvent and continuous automatic production.

Description

technical field [0001] The invention relates to a process for the production of aqueous polyurethane dispersions. Background technique [0002] Water-based polyurethane dispersion uses water as the dispersion medium, and only water volatilizes into the atmosphere during use, which has no adverse effects on the environment. At the same time, using water as the dispersion medium makes the water-based polyurethane dispersion also have the characteristics of non-toxic, odorless, non-flammable, non-explosive and safe. Water-based polyurethane dispersion is widely used as a green and environmentally friendly polymer material, and it is also the general trend to replace oily polyurethane resin. At present, it has been widely used in various fields such as synthetic leather, adhesives, and architectural coatings. [0003] Waterborne polyurethane has developed rapidly since its industrialization in the late 1960s, but its production process is still a batch method and a semi-continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/72C08G18/66C08G18/48C08G18/44C08G18/42C08G18/34C08G18/32C08G18/08
CPCC08G18/08C08G18/3206C08G18/348C08G18/4009C08G18/4018C08G18/4238C08G18/44C08G18/4825C08G18/4833C08G18/4854C08G18/664C08G18/6659C08G18/6674C08G18/6692C08G18/724C08G18/73C08G18/755C08G18/758C08G18/7614C08G18/7671
Inventor 朱彦盛兴丰孙水升马宁崔燕军潘利军唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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