Process for preparing quick response pH-sensitive polyurethane film

A polyurethane film, sensitive technology, applied in the field of preparation of pH-sensitive polyurethane film, to achieve the effect of improved response behavior, high strength, and easy process parameters

Inactive Publication Date: 2006-03-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the fast-response film-like polyurethane gel material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The invention is a preparation method of a fast-response pH-sensitive polyurethane film. It includes three-step reaction synthesis of polyurethane prepolymer emulsion and film forming process. The steps described are as follows:

[0017] 1. Three-step reaction to synthesize polyurethane emulsion:

[0018] ①Synthesis of isocyanate-terminated prepolymer: According to the molar ratio of 1: (2-3), PEG with a molecular weight of 200-3000 and DMPA for short are added to an appropriate amount of solvent, wherein the molar ratio of PEG to solvent is 1: (1-5), at room temperature 20-35 ° C, the isocyanate (2,4-toluene diisocyanate or 1,6-hexamethylene diisocyanate) monomer. According to the molar ratio of PEG to isocyanate monomer The ratio of 1: (4-6) is added to the solution, and then the catalyst T-12, which is used to make the synthesis reaction proceed smoothly, is added to the solution with a molar ratio of PEG of 1: (10-100), and the temperature is raised to 60 -70℃, r...

Embodiment 1

[0025] Dissolve 10.8g of PEG with a molecular weight of 600 and 5.6g of DMPA in 10ml of butanone, add 15.7g of TDI at 30°C, then add 0.02g of catalyst T-12, raise the temperature to 65°C, and react for 2 hours, then add 8.6g of HPA and 0.02g T-12, after continuing to react for 1 hour, lower the temperature to 50°C, drop the prepolymer solution into 100ml aqueous solution containing 4.2g triethylamine under rapid stirring, after the dropwise addition, the polyurethane prepolymer is obtained lotion. Carry out infrared spectroscopic analysis to prepolymer, in 3307cm -1 N-H stretching vibration peak appeared at 1712cm -1 The characteristic absorption peak of C=O appeared at 1600cm -1 The characteristic absorption peak of benzene nuclei appeared at 1100cm -1 The characteristic absorption peaks of ether bonds appeared at 1407 and 812cm -1 The characteristic absorption peak belonging to the double bond on the acrylate group appeared at . Proton magnetic spectrum results (ppm) ar...

Embodiment 2

[0029] PEG with a molecular weight of 400 was used to prepare a polyurethane prepolymer by the method of Example 1, and a polyurethane film with a thickness of 0.2 mm was prepared based on the prepolymer. Measure the water absorption equilibrium time and swelling degree of the film in different pH environments. When the pH values ​​are 3, 7 and 11 respectively, the water absorption equilibrium time is 18, 13 and 10 minutes, and the swelling degree is 28.1%, 103.6% and 130.2 respectively. %.

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Abstract

A process for preparing high-response pH-sensitive polyurethane film includes reaction of PEG and DMPA with excessive isocyanate to obtain prepolymer, reaction of its terminal group with HPA to produce acrylate group-capped prepolymer, adding to the aqueous solution of triethylamine, neutralizing of carboxylic group, mixing with diphenylketone, coating on flat glass with it, and solidifying by ultraviolet radiation.

Description

technical field [0001] The invention belongs to the preparation technology of polymer materials, in particular to a preparation method of a fast-response pH-sensitive polyurethane film. Background technique [0002] Hydrogel is a multi-component system composed of a polymer and a medium with a three-dimensional cross-linked network structure. A large number of hydrophilic groups (such as amide groups) or dissociable groups (such as Carboxyl group), because it can produce reversible and discontinuous volume changes with the difference of pH value, temperature, solvent type, salt concentration, etc., as well as electrical stimulation and light radiation, in drug release systems, enzyme immobilization, material separation, chemical mechanical , chemical valves, artificial muscles and other fields have shown good application prospects. Hydrogel can be divided into various forms such as block, fiber, film and microsphere. The fast-response polyurethane film is a kind of film for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/12C08G18/28C08J5/18C08G18/10C08K5/07C08L75/04
Inventor 唐黎明戴彧
Owner TSINGHUA UNIV
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