Silicon-modified hyperbranched polyurethane and preparation method thereof

A technology of hyperbranched polyurethane and silicon modification, which is applied in the field of polymer materials, can solve the problems of limited application scope and field, poor heat resistance of water-based hyperbranched polyurethane, etc., and achieve the reduction of raw material types and dosage, mild reaction conditions and low temperature Effect

Inactive Publication Date: 2017-04-26
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The water-based hyperbranched polyurethane synthesized by the above two methods has the disadvantage of poor heat resistance, which greatly limits its application range and field. Therefore, the development of water-based hyperbranched polyurethane with good heat resistance and corresponding synthesis methods has become a research hotspot.

Method used

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  • Silicon-modified hyperbranched polyurethane and preparation method thereof
  • Silicon-modified hyperbranched polyurethane and preparation method thereof
  • Silicon-modified hyperbranched polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A silicon modified hyperbranched polyurethane, its preparation method is as follows:

[0021] In a 250mL four-necked flask, add 0.006mol (6g) of polycarbonate diol (PCDL-1000, indicating a molecular weight of 1000), 0.004mol (0.5365g) of dimethylolpropionic acid (DMPA), 10mL of N-formaldehyde pyrrolidone (NMP) and 50mL of acetone, then raise the temperature to 80°C and under the protection of nitrogen, add 0.015mol (2.0183g) hexamethylene diisocyanate (HDI), and add 0.0008mol (0.5g) of catalyst di Dibutyltin laurate (DBTDL), under these conditions, react for 3 hours to generate a linear polyurethane with isocyanate as the terminal group, then add 0.1mol (2.2137g) KH-550, and continue the reaction for 3 hours to obtain To linear polyurethane with terminal group, add 0.004mol (0.4046g) triethylamine and 100mL deionized water, and remove acetone by rotary evaporation at room temperature and vacuum degree of -0.095MPa to obtain a siloxane group as terminal group Finally, a...

Embodiment 2

[0023] A silicon modified hyperbranched polyurethane, its preparation method is as follows:

[0024] In a 250mL four-neck flask, add 0.0052mol (10.4g) of polycarbonate diol (PCDL-2000), 0.004mol (0.5365g) of dimethylolpropionic acid (DMPA), 10mL of N-methylpyrrolidone (NMP ) and 40mL of acetone, then raise the temperature to 75°C and under nitrogen protection, add 0.012mol (1.6146g) hexamethylene diisocyanate (HDI), and add 0.0007mol (0.4375g) of catalyst dibutyltin dilaurate (DBTDL), under this condition, react for 3 hours to generate a linear polyurethane with isocyanate as the terminal group, then add 0.008mol (1.7710g) KH-550, and continue the reaction for 3 hours to obtain a siloxane group as the terminal group. For linear polyurethane, add 0.004mol (0.4046g) triethylamine and 150mL deionized water, and at room temperature and vacuum degree of -0.095MPa, remove acetone by rotary evaporation to obtain linear polyurethane with siloxane groups as end groups. Finally, 125mL ...

Embodiment 3

[0026] A silicon modified hyperbranched polyurethane, its preparation method is as follows:

[0027] In a 250mL four-neck flask, add 0.0064mol (3.2g) of polycarbonate diol (PCDL-500), 0.004mol (0.5365g) of dimethylolpropionic acid (DMPA), 10mL of N-methylpyrrolidone (NMP ) and 30mL of acetone, then raise the temperature to 85°C and under nitrogen protection, add 0.020mol (2.6911g) of hexamethylene diisocyanate (HDI), and add 0.0008mol (0.5g) of catalyst dibutyltin dilaurate (DBTDL), under this condition, react for 3 hours to generate a linear polyurethane with isocyanate as the terminal group, then add 0.012mol (2.1515g) KH-551, and continue the reaction for 3 hours to obtain a siloxane group as the terminal group. For linear polyurethane, add 0.004mol (0.4046g) triethylamine and 200mL deionized water, and at room temperature and vacuum degree of -0.095MPa, remove acetone by rotary evaporation to obtain linear polyurethane with siloxane groups as end groups. Finally, add 150m...

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Abstract

The invention belongs to the field of polymer materials, and in particular relates to silicon-modified hyperbranched polyurethane and a preparation method thereof. The preparation method is as follows: first, isocyanato-terminated linear polyurethane is synthesized and then reacted with a silane coupling agent to obtain siloxane-terminated linear polyurethane, then triethylamine and deionized water are added to obtain aqueous polyurethane, finally, ammonia and absolute ethanol are added for crosslinking under alkaline conditions to obtain the silicon-modified hyperbranched polyurethane. Compared with the prior art, the method has the beneficial effects that the aqueous hyperbranched polyurethane using silicon atoms as a crosslinking center can be obtained by relying on silane coupling agent molecules to modify the polyurethane, hyperbranched reaction is performed in an aqueous phase, use of a volatile organic solvent is avoided, the use amount of the organic solvent is reduced, the method is environmentally-friendly and energy saving, by the introduction of organic silicon, the heat resistance of the polyurethane is greatly improved, the use temperature limit of the polyurethane is improved, and the expansion field of the polyurethane is facilitated.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a silicon-modified hyperbranched polyurethane and a preparation method thereof. Background technique [0002] Polyurethane resin is one of the most widely used resins in the world and has excellent comprehensive properties; water-based polyurethane has good environmental performance and is a development direction of resins at present. Hyperbranched polyurethane has the characteristics of dendritic structure, low viscosity, multifunctionality and easy film formation. Waterborne hyperbranched polyurethane has the common advantages of both waterborne polyurethane and hyperbranched polyurethane, and has broad application prospects in the fields of coatings, adhesives, inks, and biomaterials. There are two methods for synthesizing waterborne hyperbranched polyurethane at this stage. One is the terminal modification of hyperbranched polymer. This hyperbranched polymer only...

Claims

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Application Information

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IPC IPC(8): C08G18/44C08G18/34C08G18/28
CPCC08G18/44C08G18/289C08G18/348
Inventor 徐祖顺张博晓熊雨轩张勇廖光福曾维国肖利吉
Owner HUBEI UNIV
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