Imidazole salt type cationic polyurethane and preparation method thereof

A cationic polyurethane technology, which is applied in the field of imidazolium salt cationic polyurethane and its preparation, can solve problems not involving nitrogen heterocyclic compounds, and achieve good protection and stability

Inactive Publication Date: 2010-11-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this patent does not involve nitrogen hete

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  • Imidazole salt type cationic polyurethane and preparation method thereof
  • Imidazole salt type cationic polyurethane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Preparation of imidazolate diol: Put 20g of dibromoneopentyl glycol in a 250mL single-necked flask, add 100mL of solvent THF and 27g of N-ethylimidazole in sequence, and reflux in an oil bath at 70°C for 10h. The solvent THF was removed by rotary evaporation to obtain ethyl imidazolium diol.

[0021] Preparation of imidazolium salt cationic polyurethane: under nitrogen protection, successively add 5.6g of polyethylene glycol with a weight-average molecular weight of 600, 30mL of solvent THF, and 2.6mL of toluene-2,6-diisocyanate into a 100mL three-necked flask, dropwise Two drops of catalyst dibutyltin dilaurate were pre-polymerized in an oil bath at 50°C for 2 hours, and then 5.0 g of the prepared ethylimidazolium salt diol was added to react for 22 hours. Methanol precipitation yields cationic polyurethane.

Embodiment 2

[0023] Preparation of imidazolate diol: Put 30g of dibromoneopentyl glycol in a 250mL one-necked flask, add 100mL of solvent THF and 18mL of N-methylimidazole in sequence, and put it in an oil bath at 70°C for reflux reaction for 10h. The solvent THF was removed by rotary evaporation to obtain methylimidazolium diol.

[0024] Preparation of cationic polyurethane: under nitrogen protection, 3.2g of methylimidazolium diol, 12.7g of polyethylene glycol with a weight average molecular weight of 106, 30mL of solvent THF, and 1.8mL of toluene-2,4-diisocyanate were added to the In a 100mL three-necked flask, two drops of catalyst dibutyltin dilaurate were added dropwise, and placed in an oil bath at 40°C for 24 hours of reaction. Methanol precipitation yields cationic polyurethane.

Embodiment 3

[0026] Preparation of imidazolate diol: Put 15g of dibromoneopentyl glycol in a 250mL single-necked flask, add 100mL of solvent THF and 9mL of N-methylimidazole in sequence, and place it in an oil bath at 70°C for reflux reaction for 10h. The solvent THF was removed by rotary evaporation to obtain methylimidazolium diol.

[0027] Preparation of cationic polyurethane: under nitrogen protection, add 1.4g of methylimidazolium salt diol, 1.0g of double-terminated hydroxyl polycaprolactone with a molecular weight of 1400, 30mL of solvent THF, and 6.3mL of hexyl diisocyanate into a 100mL three-port In the flask, add two drops of catalyst dibutyltin maleate dropwise, and place it in an oil bath at 50°C for 24 hours. Methanol precipitation yields cationic polyurethane.

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Abstract

The invention discloses imidazole salt type cationic polyurethane and a preparation method thereof. The preparation method comprises the following steps: 1) mixing 1mol of dibromoneopentyl glycol with 2mol of imidazole compound to react and obtain imidazole salt glycol; and 2) mixing 1-10mol of imidazole salt glycol, 1-10mol of long-chain glycol with the weight average molecular weight of 100-2000, 1.8-20mol of diisocyanate, tetrahydrofuran and 2-3 drops of catalyst to react in the atmosphere of nitrogen and obtain the cationic polyurethane, wherein the molecular structure of the imidazole salt type cationic polyurethane is AxByCz, A is imidazole salt glycol, B is diisocyanate, C is long-chain glycol; and (x+z)/y=1.0-1.1; and the ratio of x to z is 0.1-10.0. In the preparation method of the invention, the charged functional groups of glycol are expanded, imidazole salt glycol ionic liquid is introduced and the imidazole salt type cationic polyurethane is prepared; and the electrophoretic mobility can not be damaged by acid or base. Cationic polyurethanes with unequal electric charges can be prepared by adjusting the proportion of imidazole salt glycol; and the cationic polyurethane can be coated on elements through electrostatic adsorption, thus better protecting and stabilizing the base material.

Description

technical field [0001] The invention relates to an imidazolium salt cationic polyurethane and a preparation method thereof. Background technique [0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeated carbamate groups (NHCOO) on the main chain. By adjusting the properties and proportions of the functional groups contained in isocyanate, long-chain diols, and short-chain diols, linear thermoplastic resins or body-shaped thermosetting resins can be prepared. Abrasive, low temperature resistance, solvent resistance, biological aging resistance, high-performance polymers that are not easy to degrade. Its excellent processing performance makes it possible to make products with various properties from plastic to rubber, from soft to hard, so it is widely used in rigid or flexible foam plastics, elastomer materials, coatings, adhesives, synthetic materials, etc. Leather and fiber and many other fields. [0...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/32C08G18/10C08G18/48C08G18/42
Inventor 倪旭峰李雪梁振华沈之荃
Owner ZHEJIANG UNIV
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