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Extrusion-molding method solvent-free waterborne polyurethane dispersion as well as preparation method and application thereof

A water-based polyurethane, solvent-free technology, applied in the field of extrusion solvent-free water-based polyurethane dispersion and its preparation and application, can solve the problem of not involving urea-based structural reaction, unable to truly prepare water-based polyurethane dispersion, and the molecular weight of water-based polyurethane dispersion. problems such as small solvents, to achieve the effect of improving cohesive energy, low implementation cost, and improving performance

Inactive Publication Date: 2018-03-27
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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  • Extrusion-molding method solvent-free waterborne polyurethane dispersion as well as preparation method and application thereof
  • Extrusion-molding method solvent-free waterborne polyurethane dispersion as well as preparation method and application thereof
  • Extrusion-molding method solvent-free waterborne polyurethane dispersion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Formula: (mass percentage)

[0047]

[0048] Preparation:

[0049] (1) Mix and heat polytetrahydrofuran diol (Mn=2000), dimethylol butyric acid, and 1,4-butanediol to 80°C, add catalyst stannous octoate, 4,4-diphenylmethane diisocyanate ( MDI) is heated up to 80°C, the above two are respectively passed through the gear metering pump, the flow meter, and the injection speed after passing through the mixing head is 250rpm, L / D=45, and the temperature is 120°C, 130°C, 140°C, 150°C, 150°C °C, 160 °C, 210 °C twin-screw reactor reaction, the residence time is 0.5min;

[0050] (2) Injection temperature is 150 ℃, rotating speed is 1500rpm in the shear pump through melt gear pump, simultaneously temperature is 150 ℃, pressure is 0.5Mpa and concentration is that 2.6%wt triethylamine aqueous solution also injects in the shear pump, shears 4min;

[0051] (3) Cool down to 30°C through a heat exchanger, reduce the pressure to normal pressure, and collect it in a stainless steel...

Embodiment 2

[0053] Formula: (mass percentage)

[0054]

[0055]

[0056] Preparation:

[0057] (1) Mix and heat 1,4-butanediol polyadipate (Mn=2000), dimethylol butyric acid, and 1,4-butanediol to 100°C, add the catalyst stannous octoate, and hydrogenate The temperature of 4,4-diphenylmethane diisocyanate (HMDI) is raised to 100°C, and the above two materials pass through the gear metering pump and the flow meter respectively, and then the injection speed is 250rpm, L / D=30, and the temperature is 120°C, 120°C, 130°C, 140°C, 150°C, 170°C, 215°C twin-screw reactor reaction, the residence time is 2min;

[0058] (2) Injection temperature is 100 DEG C, rotating speed is in the shear pump of 1000rpm through melt gear pump, simultaneously temperature is 100 DEG C, pressure is 0.2Mpa, concentration is that 2.3%wt methyldiethanolamine aqueous solution also injects in shear pump, Cut for 5 minutes;

[0059] (3) The temperature is lowered to 50°C by a heat exchanger, the pressure is lowered...

Embodiment 3

[0061] Formula: (mass percentage)

[0062]

[0063] Preparation:

[0064] (1) Polytetrahydrofuran diol (Mn=2000), poly-1,4-butylene adipate diol (Mn=2000), dimethylol butyric acid, 2-methyl-1,3- Propylene glycol is mixed and heated to 60°C, the catalyst stannous octoate is added, and the temperature of hydrogenated 4,4-diphenylmethane diisocyanate (HMDI) is raised to 60°C. The above two are injected through the gear metering pump and flow meter respectively, and the speed of injection after passing through the mixing head is 200rpm, L / D=56, twin-screw reactor reaction at temperatures of 80°C, 100°C, 130°C, 140°C, 150°C, 170°C, and 215°C, and the residence time is 1min;

[0065] (2) Inject the melt gear pump into the shear pump with a temperature of 200°C and a rotational speed of 2500rpm. At the same time, the temperature is 200°C and the pressure is 0.2Mpa. The aqueous solution of triethanolamine with a concentration of 3.1%wt is also injected into the shear pump and shea...

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Abstract

The invention provides an extrusion-molding method solvent-free waterborne polyurethane dispersion as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preheating polymeric diol, diisocyanate, micromolecular diol, a low-melting-point dihydroxy-terminated Y type side chain hydrophilic chain extender and a catalyst respectively, then inputting the materials into a mixer to disperse and mix the materials, and inputting the mixture into a twin-screw reactor to perform a reaction in order to obtain polyurethane melt; (2) injecting the polyurethane melt into a shear pump, injecting water containing a neutralizing agent into the shear pump, and performing shearing and dispersion at a high temperature of 120 to 200 DEG C under the pressure of 0.2 to 1.5Mpa; (3) cooling and decompressing, adding a chain extender, and reacting while stirring to obtain the solvent-free waterborne polyurethane dispersion. The method provided by the invention is environmentally friendly; by adopting the method, the cohesive energy of a product is increased greatly, the production process is efficient, and the performance of the waterborne polyurethane can be improved greatly.

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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IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08G18/08C08G18/32C08G18/34C08G18/12
CPCC08G18/0823C08G18/12C08G18/3206C08G18/348C08G18/4238C08G18/44C08G18/4837C08G18/4854C08G18/6625C08G18/6659C08G18/6692C08G18/3857C08G18/3228
Inventor 朱彦马宁潘利军盛兴丰陈晓南冯学鹏唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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