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Preparation method of colorful polyurethane emulsion

A technology of polyurethane emulsion and water-based polyurethane, which is applied in the field of preparation of colored polyurethane emulsion, and can solve problems such as thermodynamic incompatibility, inconvenient production, and poor compatibility

Inactive Publication Date: 2013-02-13
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor compatibility between pigment particles and polyurethane resin, other additives need to be added to the system to ensure the dispersion and stability of the system, but at the same time, these additives contain harmful substances, which will have adverse effects on the construction environment. The thermodynamic incompatibility of the color paste and the water-based resin system, the multi-phase interface of the mechanical blending, etc., the performance and variety of the resulting paint have many problems, and it also brings a lot of inconvenience to the production

Method used

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  • Preparation method of colorful polyurethane emulsion
  • Preparation method of colorful polyurethane emulsion
  • Preparation method of colorful polyurethane emulsion

Examples

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preparation example Construction

[0009] The preparation method of this colored polyurethane emulsion comprises the following steps:

[0010] (1) Prepare prepolymer by reacting isocyanate, polyether polyol and polyester polyol;

[0011] (2) Carry out chain extension reaction with the prepolymer prepared in step (1) with colored small molecule chain extender, common small molecule chain extender and hydrophilic chain extender;

[0012] (3) Neutralize with a salt-forming agent, add water to disperse and emulsify, and distill off the organic solvent under reduced pressure to obtain a colored water-based polyurethane emulsion.

[0013] In the preparation method of this colored polyurethane emulsion, the isocyanate described in step (1) can be isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, dimethylene phenyl diisocyanate, tetramethylcyclo One or more of hexane diisocyanate, 1,6-hexamethylene diisocyanate, the polyether polyol can be polyethylene glycol, polyoxypropylene glycol, polytetrahydrof...

Embodiment 1

[0042] (a) Preparation of blue small molecule chain extender:

[0043] First, add 16g of 1,4-dihydroxyanthraquinone, 30g of potassium carbonate, and 200ml of deionized water into a 1000ml three-necked flask. After heating to boiling, add 40g of sodium hyposulfite, and then add 10g of sodium hyposulfite after 15 minutes to ensure complete reduction. After cooling, filter with suction to obtain 6.9 g of brown needle-like substance.

[0044] Weigh 9.6 g of the synthesized brown substance, add 20 equivalents of isopropanolamine, stir and react at 50° C. for 1 hour under the protection of nitrogen, and then pass through air to oxidize and continue the reaction for 40 minutes. After the reaction, the temperature was lowered to 15°C, acetonitrile was added for precipitation, and 12 g of the desired blue small molecule chain extender 1,4-bis(2-methyl-3-hydroxyethylamino)anthraquinone was obtained by suction filtration.

[0045] (b) Preparation of prepolymer

[0046] Add 87.5g of MDI...

Embodiment 2

[0052] (a) Preparation of blue small molecule chain extender:

[0053] First, add 8g of 1,4-dihydroxyanthraquinone, 18g of potassium carbonate, and 200ml of deionized water into a 1000ml three-necked flask. After heating to boiling, add 17g of sodium hyposulfite, and then add 5g of sodium hyposulfite after 15 minutes to ensure complete reduction. After cooling, filter with suction to obtain 6.9 g of brown needle-like substance.

[0054] Weigh 6.5 g of the synthesized brown substance, add 15 equivalents of 2-amino-2-methyl-1-propanol, stir and react at 50° C. for 1 hour under the protection of nitrogen, and then continue the reaction for 40 minutes by passing through air for oxidation. After the reaction, the temperature was lowered to 15°C, acetonitrile was added for precipitation, and 8 g of the desired blue small molecule chain extender 1,4-bis(1,1-dimethyl-2-hydroxyethylamino)anthraquinone was obtained by suction filtration.

[0055] (b) Preparation of prepolymer

[0056]...

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Abstract

The invention provides a preparation method of colorful polyurethane emulsion, comprising the following steps of: (1) reacting isocyanate, polyether polyol and polyester polyol to obtain a prepolymer; (2) carrying out chain extension reaction on the prepolymer prepared by the step (1), a colorful micromolecule chain extender, a common micromolecule chain extender and a hydrophilic chain extender; and (3) neutralizing by a salt-forming agent, emulsifying in a dispersing way by adding water, and removing an organic solvent by means of reduced pressure distillation to obtain the colorful hydrophilic polyurethane emulsion. According to the preparation method, the colorful micromolecule chain extender participates in the chain extension reaction, so that the prepared colorful polyurethane emulsion is better in whole performance, wide and adjustable in solid content distribution, and less in residuals of harmful substances in the colorful polyurethane emulsion. The red, yellow and blue three-color polyurethane emulsion can be synthesized by the micromolecule chain extenders with different colors, and the required polyurethane emulsion with the other colors can be obtained due to simple blending.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane and a preparation method of colored polyurethane emulsion. Background technique [0002] Polyurethane is the abbreviation of polyurethane, which means that the main chain of the macromolecule contains repeated urethane units. In addition to containing a large number of urethane bonds, it may also contain ester bonds, ether bonds, urea bonds, and allophanic acid. Ester bonds, isocyanurate bonds, hydrogen bonds between macromolecules, etc. Polyurethane is a block polymer composed of flexible soft segments composed of polyester or polyether and rigid hard segments such as carbamate and urea groups alternately connected; due to the thermodynamic incompatibility of soft and hard segments, soft Segment and hard segment aggregate in the polymer respectively to form soft segment phase and hard segment phase, and microphase separation occurs. Due to the unique microphase separation stru...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/34C08G18/32C08G18/12C07C225/34C07C221/00C07C49/755C07C45/64C08J3/03
Inventor 郦聪沈连根张勇徐欣欣石磊纪尚超沈建峰沈雁宾
Owner JIAXING HEXIN CHEM IND
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