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Solvent-free aqueous polyurethane dispersion and its preparation method and application

A water-based polyurethane and solvent-free technology, which is applied in the field of solvent-free water-based polyurethane dispersion and its preparation and application, can solve the problem of no reaction involving urea group structure, small molecular weight solvent of water-based polyurethane dispersion, and the inability to really prepare water-based polyurethane dispersion, etc. problems, to achieve the effect of improving market competitiveness, product quality and batch stability, and reducing production costs

Active Publication Date: 2021-05-11
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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  • Solvent-free aqueous polyurethane dispersion and its preparation method and application
  • Solvent-free aqueous polyurethane dispersion and its preparation method and application
  • Solvent-free aqueous polyurethane dispersion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Formula: (mass percentage)

[0046]

[0047]

[0048] Preparation:

[0049] Mix and heat polytetrahydrofuran diol (Mn=2000), 2-polyethylene glycol monomethyl ether-1,4-butanediol (Mn=1000), 2-methyl-1,3-butanediol to 80 ℃, add the catalyst stannous octoate, 4,4-diphenylmethane diisocyanate (MDI) is heated to 80 ℃, the above two are respectively passed through the gear metering pump, flow meter, and after passing through the mixing head, the injection speed is 250rpm, L / D= 45. React in twin-screw reactors with temperatures of 120°C, 130°C, 140°C, 150°C, 150°C, 160°C, and 210°C, and the residence time is 0.5min;

[0050] Through the melt gear pump, it is injected into the shear pump with a temperature of 150°C and a speed of 1500rpm. At the same time, a solution of sodium cetyl sulfate with a temperature of 150°C, a pressure of 0.5Mpa, and a concentration of 0.5%wt is also injected into the shear pump. 4min;

[0051] The temperature was lowered to 30° C. by a hea...

Embodiment 2

[0054] Formula: (mass percentage)

[0055]

[0056] Preparation:

[0057] Mix and heat polytetrahydrofuran diol (Mn=4000), polyethylene oxide diol (Mn=1000), and 1,4-butanediol to 60°C, add catalyst stannous octoate, and heat up toluene diisocyanate (TDI) to 60°C, the above two are respectively passed through the gear metering pump, flow meter, and then through the mixing head. , Reaction in a twin-screw reactor at 215°C, with a residence time of 2 minutes;

[0058] The melt gear pump is injected into the shear pump with a temperature of 120°C and a rotational speed of 2500rpm. At the same time, a solution of sodium cetyl sulfate with a temperature of 120°C, a pressure of 0.2Mpa, and a concentration of 2%wt is also injected into the shear pump. Cut for 5 minutes;

[0059] The temperature was lowered to 50° C. by a heat exchanger, the pressure was lowered to normal pressure, and collected in a stainless steel storage tank. After the collection was full, it was stirred for...

Embodiment 3

[0061] Formula: (mass percentage)

[0062]

[0063] Preparation:

[0064] Mix polyadipate-1,4-butanediol (Mn=4000), 2-polyethylene glycol monomethyl ether-1,4-butanediol (Mn=2000) and ethylene glycol and heat To 100°C, add the catalyst dibutyltin dilaurate, isophorone diisocyanate (IPDI) and hydrogenated 4,4-diphenylmethane diisocyanate (HMDI) at a molar ratio of 1:2 and raise the temperature to 100°C, the above two Through the gear metering pump and flowmeter respectively, after passing through the mixing head, inject into the twin-screw with a rotation speed of 250rpm, L / D=50, and temperatures of 100°C, 120°C, 130°C, 140°C, 170°C, 200°C, and 230°C. Reactor reaction, residence time is 1.5min;

[0065] The melt gear pump is injected into the shear pump at a temperature of 200°C and a speed of 1500rpm. At the same time, the temperature is 200°C, the pressure is 1.5Mpa, and the concentration is 1%wt sodium dodecylbenzenesulfonate solution also flows at 150kg / h In the shear...

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Abstract

The invention provides a solvent-free aqueous polyurethane dispersion and its preparation method and application. The preparation method comprises the following steps: (1) adding polymer diol, diisocyanate, small molecular diol, low melting point two-terminal hydroxyl group " Y” type side chain hydrophilic chain extender and catalyst are preheated separately and input into the twin-screw reactor to react to obtain polyurethane melt; Inject into a shear pump to shear and disperse; (3) lower the temperature and pressure, and stir to obtain the solvent-free aqueous polyurethane dispersion. The invention solves the technical problems of synthesis, dispersion and emulsification of high-viscosity water-based polyurethane melt, improves production efficiency and stability of product batches; does not need to use expensive hydrophilic chain extenders, and can be used for synthetic leather, Adhesives, paints, fabric coatings, finishes, base fabric resins, surface layer resins, tie layer resins, middle layer resins or foam layer resins.

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 Patents(China)
IPC IPC(8): C08J3/03C08G18/76C08G18/75C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08L75/08C08L75/06C08L75/04
CPCC08G18/3206C08G18/4018C08G18/42C08G18/4238C08G18/4825C08G18/4854C08G18/664C08G18/6674C08G18/755C08G18/7614C08G18/7671C08J3/03C08J2375/04C08J2375/06C08J2375/08
Inventor 盛兴丰朱彦马宁崔燕军唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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