Epoxy resin modified waterborne hyperbranched polyurethane and preparation method thereof

A hyperbranched polyurethane and epoxy resin technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of insufficient stability of the emulsion, cumbersome steps, and easy cross-linking

Active Publication Date: 2013-02-13
ETERNAL CHEM (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the following disadvantages exist in the synthesis process of hyperbranched waterborne polyurethane, such as easy crosslinking, cumbersome steps, and the

Method used

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  • Epoxy resin modified waterborne hyperbranched polyurethane and preparation method thereof
  • Epoxy resin modified waterborne hyperbranched polyurethane and preparation method thereof
  • Epoxy resin modified waterborne hyperbranched polyurethane and preparation method thereof

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preparation example Construction

[0084] The preparation method of epoxy resin modified waterborne hyperbranched polyurethane of the present invention, concrete steps are as follows:

[0085] 1) The organic acid (a) containing one carboxyl group and two hydroxyl groups and the alcohol (b) containing multiple hydroxyl groups are reacted at a certain reaction temperature (such as 140-160 ° C) for a period of time (such as 8-24 hours), under vacuum conditions (such as below 740mmHg), the molar ratio between (a) and (b) used is 12 / 1-4 / 1, thereby forming a large amount of hydroxyl-terminated reaction intermediates (referred to as A1 , namely the hyperbranched polyester A-(OH) of the present invention n );

[0086] Wherein, used (a), its structure is as follows:

[0087]

[0088] Among them, R 5 Can be:

[0089]

[0090]Wherein, m is an integer ≥ 1 (preferably an integer of 1-10).

[0091] (b) used may be:

[0092] ethylene glycol, diethylene glycol,

[0093] Glycerol, Trimethylolpropane,

[00...

Embodiment 1

[0142] 1.1 Preparation of epoxy resin modified waterborne hyperbranched polyurethane 1

[0143] 1) Add 13.6g (0.1mol) of pentaerythritol and 53.64g (0.4mol) of dimethylolpropionic acid (DMPA) in a four-necked flask equipped with mechanical stirring, a thermometer, and a condenser tube. (740mmHg), react at 140-160°C for 2.5h to obtain a transparent yellowish liquid;

[0144] Then add 107.28g (0.8mol) DMPA to the transparent yellowish liquid, and react at 140-160°C under vacuum conditions (below 740mmHg), until the acid value of the resin is measured to be less than 20mg KOH / g, and the reaction is terminated , discharging, cooling to obtain light yellow transparent or translucent solid, denoted as A1-1 (the molar ratio of pentaerythritol and dimethylolpropionic acid is 1 / 12).

[0145] 2) Dissolve 18.94g of A1-1 (0.0121mol) in 50g of N-methylpyrrolidone, add 8.57g (0.085mol) of succinic anhydride, and react at 100°C for 36 hours to obtain a light yellow transparent liquid, which...

Embodiment 2

[0164] 2.1 Preparation of epoxy resin modified waterborne hyperbranched polyurethane 2

[0165] 1) Add 13.6g (0.1mol) of pentaerythritol and 53.64g (0.4mol) of dimethylolpropionic acid (DMPA) into a four-necked flask equipped with mechanical stirring, a thermometer, and a condenser, and react at 140-160°C after mixing 2.5h, under vacuum conditions (below 740mmHg), a transparent yellowish liquid is obtained;

[0166] Then add 107.28g (0.8mol) DMPA to the transparent yellowish liquid, and react at 140-160°C under vacuum conditions (below 740mmHg), until the acid value of the resin is less than 20mg KOH / g, and the reaction is terminated , poured out, and after cooling, a yellowish transparent or translucent solid was obtained, which was denoted as A1-2 (the molar ratio of dimethylol propionic acid and pentaerythritol was 12 / 1).

[0167] 2) Dissolve 18.94g of A1-2 (0.0121mol) in 50g of N-methylpyrrolidone, add 8.57g (0.085mol) of succinic anhydride, and react at 100°C for 36 hour...

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Abstract

The invention provides epoxy resin modified waterborne hyperbranched polyurethane and a preparation method thereof, and particularly discloses epoxy resin modified hyperbranched waterborne polyurethane as refined in formula I and the preparation method thereof. By means of the method, crosslinking of hyperbranched polyester is reduced, and the obtained polyurethane possesses good water resisting property and chemical resistance, is suitable for water-based paint, waterborne adhesives and the like, or is used as phase solubilizers or catalyst supports and the like, thereby possessing wide application prospects.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an epoxy resin modified water-based hyperbranched polyurethane and a preparation method thereof. Background technique [0002] Polyurethane coatings have good stability, film-forming properties, adhesion, gloss and solvent resistance, etc., and have been widely used in national defense, chemical anti-corrosion, wood, etc. At present, solvent-based polyurethane is mostly used in industry. Solvent-based polyurethane has stable performance, but it contains organic solvents, which are flammable, explosive, toxic, pollute the environment, and cost high. [0003] In order to overcome the above problems, technicians have developed a water-based polyurethane with water as the dispersion medium. Water-based polyurethane is non-toxic, energy-saving, low-cost, and non-polluting, but its physical properties are sometimes inferior to solvent-based polyurethane. Existing water-ba...

Claims

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Application Information

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IPC IPC(8): C08G18/58C08G18/42C08G18/78C09D175/06C09J175/06
Inventor 潘金城翁进益
Owner ETERNAL CHEM (CHINA) CO LTD
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