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Method of preparing superbranched polyurethane

A hyperbranched polyurethane and catalyst technology, applied in the field of preparation of hyperbranched polyurethane, can solve the problems of single product structure, too many hard segments of hyperbranched polyurethane, poor flexibility, etc., and achieve simple synthesis method, easy industrial production, and source wide effect

Inactive Publication Date: 2007-05-23
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a single small molecule monomer as a raw material in this method, there are too many hard segments of hyperbranched polyurethane prepared, and the product has a single structure and poor flexibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0030] The present invention prepares method embodiment 1~7 of hyperbranched polyurethane, and its method is specifically:

[0031] (1) Mix diisocyanate and oligomer diol, and stir at 60-100°C for 0.5-5 hours in an inert gas atmosphere;

[0032] (2) Add an aprotic organic solvent, add the aprotic organic solution of dialkanolamine dropwise to the above solution at -10-10°C, add a catalyst after the dropwise addition, and raise the temperature to 20-100°C , continue the reaction for 1 to 240 hours, and add an amino-containing compound;

[0033] (3) stop stirring, withdraw inert gas, precipitate with precipitant, filter, separate, dry to obtain hyperbranched polyurethane;

[0034] In the above method, the mol ratio of diisocyanate and oligomer diol is 1.2~10:1;

[0035] The number of moles of dialkanolamine is: (x-y)-2(x-y); wherein, x is the number of moles of diisocyanate actually used, and y is the number of moles of oligomer diol actually used.

[0036] The structure of t...

Embodiment 8～14

[0040] The present invention prepares method embodiment 8~14 of hyperbranched polyurethane, and its method is specifically:

[0041] (1) Mix diisocyanate and oligomer diol, add catalyst, and stir at 60-100°C for 0.5-5 hours in an inert gas atmosphere;

[0042] (2) Add an aprotic organic solvent, add the aprotic organic solution of dialkanolamine dropwise to the above solution at -10-10°C, add a catalyst after the dropwise addition, and raise the temperature to 20-100°C , continue the reaction for 1 to 240 hours, and add an amino-containing compound;

[0043] (3) stop stirring, precipitate with a precipitating agent, filter, separate, and dry to obtain hyperbranched polyurethane;

[0044]In the above method, the mol ratio of diisocyanate and oligomer diol is 10~1.2:1;

[0045] The number of moles of dialkanolamine is: (x-y)-2(x-y); wherein, x is the number of moles of diisocyanate actually used, and y is the number of moles of oligomer diol actually used.

[0046] The cataly...

Embodiment 15

[0051] Embodiment 15 is compared with embodiment 4, only the step of adding aprotic organic solvent is placed in step (1), in step (2) no longer adds aprotic organic solvent; Other steps are all with embodiment 4 is the same.

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PUM

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Abstract

The invention relates to a preparation method for hyperbranched polyurethane. The said method includes carrying out a reaction of diisocyanate and oligomer diol to obtain macromolecule A2, and then carrying out a polymerization reaction of the macromolecule A2 and monomer bB2 to prepare hyperbranched polyurethane. The method enhances the ratio of soft chain to obtain a hyperbranched polyurethane with good performance. The source of raw material used is wide, and cheap and easy to get. The synthesis method is simple without the introduction of protection groups, and easy to industrial production. The prepared hyperbranched polyurethane can be used for elastomer, adhesives, paints, and so on, and has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of hyperbranched polyurethane. Background technique [0002] Hyperbranched polymers are generally composed of AB x (x≥2)-type monomer polycondensation (Kim Y H, Webster O W. Macromolecules, 1992, 25, 5561), a series of hyperbranched polymers have been synthesized by this method, such as polyesters, polyamides Classes, polyimides, etc. Due to the characteristics of the isocyanate group, use AB containing both isocyanate group and hydroxyl group x It is impossible to synthesize hyperbranched polyurethanes with type monomers. In 1993, Spindler and Frechent (Spindler R, Frechent J M J. Macromolecules, 1993, 26: 4809) reported AB containing an alkane hydroxyl group and two protected isocyanate groups 2 Synthesis of hyperbranched polyurethanes by stepwise polymerization of type monomers. In the same year, Kumar and Ramarkrishnan (Kumar A, Ramarkrishnan S.J Chem.Soc., Chem.Commun.1993, 1453) used 3,5-dihydrox...

Claims

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Application Information

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IPC IPC(8): C08G18/32C08G18/08C08G18/72C08G18/24
Inventor 陈爱芳姚畅徐祖顺易昌凤
Owner HUBEI UNIV
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