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Long-chain organosilicon-modified exposed waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane, silicone technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor elongation at break, high water absorption, low tensile strength, etc., achieve excellent mechanical properties, simple steps , the effect of convenient operation

Pending Publication Date: 2021-12-10
三棵树(上海)新材料研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of high water absorption, poor elongation at break, and low tensile strength in the existing exposed water-based polyurethane, the present invention provides a long-chain organic silicon-modified exposed water-based polyurethane emulsion and a preparation method thereof. Introduce the preferred long-chain silicone for modification, control the ratio of urethane bond and urea group at the same time, control the addition of hydrophilic chain extender, and properly introduce trifunctional small molecule polyol, with low water absorption , high elongation at break and excellent tensile strength

Method used

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  • Long-chain organosilicon-modified exposed waterborne polyurethane emulsion and preparation method thereof
  • Long-chain organosilicon-modified exposed waterborne polyurethane emulsion and preparation method thereof
  • Long-chain organosilicon-modified exposed waterborne polyurethane emulsion and preparation method thereof

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Embodiment 1

[0031] A long-chain organosilicon-modified exposed water-based polyurethane emulsion according to the present invention is mainly prepared from the following components according to the following ratios by weight and number:

[0032]

[0033] Among them, polydimethylsiloxane, M W = 4200 g / mol.

[0034] The polyether polyol is polypropylene glycol.

[0035] Described organic solvent is acetone.

[0036] The water is deionized water.

[0037] The preparation method of the long-chain organosilicon-modified exposed water-based polyurethane emulsion mainly includes the following steps in sequence:

[0038] (1) React polyether polyol, 4,4'-dicyclohexylmethane diisocyanate and polydimethylsiloxane at 60°C for 1 hour under nitrogen protection;

[0039] (2) Add 2,2-dimethylolpropionic acid to the reactant obtained in step (1), heat up to 70°C for 1 hour;

[0040] (3) Cool down to 50°C, add an organic solvent to the reactant obtained in step (2), and stir for 0.5h;

[0041] (4)...

Embodiment 2

[0046] A long-chain organosilicon-modified exposed water-based polyurethane emulsion according to the present invention is mainly prepared from the following components according to the following ratios by weight and number:

[0047]

[0048] Among them, polydimethylsiloxane, M W = 4000 g / mol.

[0049] The polyether polyol is polypropylene glycol.

[0050] Described organic solvent is acetone.

[0051] The water is deionized water.

[0052] The preparation method of the long-chain organosilicon-modified exposed water-based polyurethane emulsion mainly includes the following steps in sequence:

[0053] (1) React polyether polyol, 4,4'-dicyclohexylmethane diisocyanate and polydimethylsiloxane at 55°C for 1.2h under nitrogen protection;

[0054] (2) Add 2,2-dimethylolpropionic acid to the reactant obtained in step (1), and raise the temperature to 68°C for 1.2h;

[0055] (3) Cool down to 48° C., add an organic solvent to the reactant obtained in step (2), and stir for 1 h...

Embodiment 3

[0061] A long-chain organosilicon-modified exposed water-based polyurethane emulsion according to the present invention is mainly prepared from the following components according to the following ratios by weight and number:

[0062]

[0063] Among them, polydimethylsiloxane, M W = 4400 g / mol.

[0064] The polyether polyol is polypropylene glycol.

[0065] Described organic solvent is acetone.

[0066] The water is deionized water.

[0067] The preparation method of the long-chain organosilicon-modified exposed water-based polyurethane emulsion mainly includes the following steps in sequence:

[0068] (1) React polyether polyol, 4,4'-dicyclohexylmethane diisocyanate and polydimethylsiloxane at 65°C for 0.8h under nitrogen protection;

[0069] (2) Add 2,2-dimethylolpropionic acid to the reactant obtained in step (1), and raise the temperature to 72°C for 0.8h;

[0070] (3) Cool down to 49°C, add an organic solvent to the reactant obtained in step (2), and stir for 1.5h;...

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Abstract

The invention relates to a long-chain organosilicon-modified exposed waterborne polyurethane emulsion and a preparation method thereof. The long-chain organosilicon-modified exposed waterborne polyurethane emulsion is mainly prepared from the following components in parts by weight: 80-150 parts of polyether polyol, 30-35 parts of dicyclohexylmethane 4,4'-diisocyanate, 5-8 parts of polydimethylsiloxane, 5-6 parts of 2,2-dimethylolpropionic acid, 1-1.5 parts of 1,4-butanediol, 2-4 parts of ethylenediamine or diethylenetriamine, 2-3 parts of trimethylolpropane, 4-5 parts of triethylamine, 30-40 parts of an organic solvent and 195 to 311 parts of water, wherein MW of polydimethylsiloxane is equal to 4000-4400 g / mol. According to the invention, the defects that existing exposed waterborne polyurethane is high in water absorption rate, poor in elongation at break, low in tensile strength and the like are overcome; and optimal long-chain organosilicon is introduced for modification, a ratio of carbamate bonds to ureido is regulated and controlled, the adding amount of a hydrophilic chain extender is controlled, and three-functionality micromolecular polyol is properly introduced, so the long-chain organosilicon-modified exposed waterborne polyurethane emulsion of the invention has the advantages that water absorption rate is low, elongation at break is high, and tensile strength is excellent.

Description

technical field [0001] The invention relates to a long-chain organosilicon-modified exposed water-based polyurethane emulsion and a preparation method thereof, which are applied in the field of water-based polyurethane emulsion production. Background technique [0002] Water-based polyurethane uses water as the dispersion medium and utilizes the reaction of polyisocyanates and polyols to generate a type of polymer material with repeated carbamate groups on the main chain and microphase separation of soft and hard segments. It has high strength, It has the advantages of good stability, non-toxic and pollution-free, low cost, easy modification and adjustable performance. The preparation of water-based polyurethane not only has a variety of raw materials for soft and hard segments, and the synthesis process conditions are adjustable, but also can be modified with different functions through the reaction of isocyanate and active groups (amine groups, hydroxyl groups). Therefore,...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/61C08G18/34C08G18/32C09D175/08
CPCC08G18/6688C08G18/48C08G18/61C08G18/348C08G18/3206C08G18/3228C09D175/08
Inventor 童自强姜美佳孔丁峰
Owner 三棵树(上海)新材料研究有限公司
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