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Preparation method of waterborne polyurethane dispersoid

A water-based polyurethane and dispersion technology, applied in the chemical field, can solve the problems of short shelf life, unsuitable for digital inkjet printing, and easy to produce gel, etc., achieve high water resistance and chemical stability, excellent resistance to dry and wet rubbing, The effect of excellent adhesion

Inactive Publication Date: 2017-08-04
SHENZHEN RUNTIANZHI DIGITAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, two-component waterborne polyurethane has the advantages of excellent chemical resistance, high hardness, good wear resistance and good adhesion, but it is very inconvenient to use, especially in the fields of fabric printing and coating, which is almost impossible to use
The external linking one-component water-based polyurethane mainly improves the water resistance, chemical resistance and mechanical properties of the paint film by adding external linking reagents, but the external linking method has defects such as short shelf life and easy gel generation, which is not suitable for digital inkjet printing

Method used

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  • Preparation method of waterborne polyurethane dispersoid

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[0029] The invention provides a kind of preparation method of aqueous polyurethane dispersion, comprises the following steps:

[0030] Under the action of acetone and a catalyst, a prepolymer is obtained by using polyglycol, diisocyanate monomer and the first small molecule polyol and / or isocyanate multimer to perform crosslinking;

[0031] Add a hydrophilic chain extender to the prepolymer to form a hydrophilic prepolymer;

[0032] After adding the neutralizing agent into the hydrophilic prepolymer for neutralization, adding deionized water for emulsification and dispersion, adding a second small molecule polyol for secondary crosslinking, and removing acetone to obtain an aqueous polyurethane dispersion.

[0033] In the preparation method provided by the invention, at first, acetone can be used as a solvent to dilute the viscosity of the mixture of polyglycol, diisocyanate monomer and the first small molecule polyol and / or isocyanate multimer, under the action of catalyst, ...

Embodiment 1

[0061] a. Dehydrate the polycarbonate diol (PCDL-2000) under reduced pressure at 120°C for 1.5 hours for later use.

[0062] b. Under nitrogen protection, add 300g of polycarbonate diol (PCDL-2000) , 200g of acetone and 0.04g of DBTDL were heated to 40°C and mixed thoroughly; 66.7g of IPDI and 43.8g of DesmodurN3390 were added to the reaction vessel at 40°C for 60 minutes using a dropping device, and 10.0g of acetone was added to the The residue in the dropping device is washed into the reaction vessel, and the temperature of the reaction vessel can be raised to 50°C and kept for about 30 minutes, so that under the action of acetone and DBTDL, polycarbonate diol (PCDL-2000), IPDI and DesmodurN3390 are cross-linked once to obtain a prepolymer with a cross-linked structure;

[0063] C, utilize the DMPA of 13.4g to add in the reaction container by dripping device, form hydrophilic prepolymer;

[0064] d. Add 10.1g of triethylamine to the reaction vessel using the dropping devic...

Embodiment 2

[0067] a. After mixing polycarbonate diol (PCDL-1000) and polytetrahydrofuran diol (PTMEG-1000) at a ratio of 1:1, dehydrate under vacuum at 120°C for 1.5h for later use.

[0068]b. Under nitrogen protection, add 200g of polycarbonate diol (PCDL-1000) The mixture mixed with polytetrahydrofuran glycol (PTMEG-1000) at a ratio of 1:1, 10g of TMP, 300g of acetone and 0.03g of DBTDL was heated to 40°C and mixed thoroughly; using a dropping device at 40°C for 60 minutes Add 120g of HDI to the reaction vessel, rinse the residue in the dropping device into the reaction vessel with 10.0g of acetone, and raise the temperature of the reaction vessel to 50°C and keep it for about 30 minutes, so that the mixture of acetone and DBTDL Under the action of polycarbonate diol (PCDL-1000), polytetrahydrofuran diol (PTMEG-1000), HDI and TMP are cross-linked once to obtain a prepolymer with a cross-linked structure;

[0069] C, utilize the DMPA of 22.3g to add in the reaction container by drippin...

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Abstract

The embodiment of the invention discloses a preparation method of a waterborne polyurethane dispersoid. The preparation method is used for obtaining the waterborne polyurethane dispersoid with low water-absorbing property, high water tolerance and chemical stability as well as excellent adhesive force and wet-dry rubbing fastness, so that the waterborne polyurethane dispersoid is applicable to the fields of leather, fabric printing, coating and the like, particularly digital ink jet printing. The method provided by the embodiment of the invention comprises the following steps: performing crosslinking on poly-dihydric alcohol, a diisocyanate monomer as well as first micromolecular polyhydric alcohol and / or an isocyanate polymer for the first time to obtain a prepolymer; adding a hydrophilic chain-extending agent into the prepolymer to form a hydrophilic prepolymer; and adding a neutralizing agent into the hydrophilic prepolymer to perform neutralization, adding deionized water to perform emulsion dispersion, adding second micromolecular polyhydric alcohol to perform crosslinking for the second time, and removing acetone to obtain the waterborne polyurethane dispersoid.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a preparation method of an aqueous polyurethane dispersion. Background technique [0002] With the enhancement of people's awareness of environmental protection and the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, waterborne polyurethane has been continuously developed due to its advantages of safe production, transportation and use, and no pollution to the environment. [0003] However, compared with solvent-based polyurethane, water-based polyurethane still has defects such as poor water resistance and poor solvent resistance. Especially when it is applied to substrates such as textiles and leather, its adhesion and resistance to dry and wet scratches need to be improved, which cannot meet the needs of the market. The demand has seriously affected the application of waterb...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/34C08G18/32C08G18/08C08G18/40C08G18/48C08G18/12D06P1/52
CPCC08G18/12C08G18/0823C08G18/3206C08G18/348C08G18/4018C08G18/44C08G18/4854C08G18/6625C08G18/6659C08G18/6692D06P1/5285
Inventor 刘红旗江洪
Owner SHENZHEN RUNTIANZHI DIGITAL EQUIP
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