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Waterborne polyurethane acidic polymer indicator and preparation method thereof

A water-based polyurethane and acid indicator technology, which is applied in the field of water-based polyurethane acid polymer indicator and its preparation, can solve the problems of toxic side effects, test system pollution, and non-repeatable use, and achieve wide application fields and storage stability Good, easy to use effect

Active Publication Date: 2018-10-09
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Small molecule indicators may pollute the test system, have certain toxic and side effects, and do not have the disadvantages of repeated use, which limits their application in many fields.

Method used

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  • Waterborne polyurethane acidic polymer indicator and preparation method thereof
  • Waterborne polyurethane acidic polymer indicator and preparation method thereof
  • Waterborne polyurethane acidic polymer indicator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, 1 g of Congo red was dissolved in 20 g of N,N-dimethylformamide to obtain a solution of Congo red in N,N-dimethylformamide. in N 2 Under the protection of 250ml flask equipped with thermometer, stirrer, reflux condenser, add 50g polyoxypropylene diol (Mn=1000), 110 ℃, under the condition of 0.1MPa, dehydration treatment 2h. Then add 33g of isophorone diisocyanate and 0.02g of dibutyltin dilaurate, raise the temperature to 90°C and react for 2.5h, add the N,N-dimethylformamide solution of Congo red and react at 110°C for 3h. Cool down to 70°C, add 9g of 1,2-propanediol-3-sodium sulfonate and 2g of ethylene glycol to react for 2 hours. 300g deionized water, disperse at high speed for 30min. Raise the temperature to 80°C, remove the organic solvent at 0.6MPa, and filter to obtain the water-based polyurethane Congo red indicator.

[0026] The water-based polyurethane Congo red indicator prepared in this example has a discoloration range of 3.5 to 5.2, re...

Embodiment 2

[0028] In the present embodiment, 1.5g Congo red is dissolved in the tetrahydrofuran solution of 20g, obtains the tetrahydrofuran solution of Congo red. Into a 250ml flask equipped with a thermometer, a stirrer, and a reflux condenser, add 50g of polytetrahydrofuran diol (Mn=1000), and dehydrate at 110°C and 0.1MPa for 1.5h. Add 27g of toluene diisocyanate and 0.02g of stannous octoate, raise the temperature to 80°C for 3 hours, add a solution of Congo red in tetrahydrofuran and react for 3 hours at 110°C. Cool down to 70°C, add 10gl, sodium 4-butanediol-2-sulfonate and 3g 1,4-butanediol to react for 2h. 300g deionized water, disperse at high speed for 30min. Raise the temperature to 80°C, remove the organic solvent under 0.6MPa, and filter to obtain the water-based polyurethane Congo red indicator.

[0029] The water-based polyurethane Congo red indicator prepared in this example has a discoloration range of 3.5 to 5.2, red in the alkaline state, blue-purple in the acidic s...

Embodiment 3

[0031] In the present embodiment, 2.0g Congo red is dissolved in the tetrahydrofuran solution of 20g, obtains the tetrahydrofuran solution of Congo red. In a 250ml flask equipped with a thermometer, a stirrer, and a reflux condenser, add 50g of polycaprolactone diol (Mn=1000), and dehydrate for 1.5h at 110°C and 0.1MPa. Add 37.5g of 4,4-diphenylmethane diisocyanate and 0.02g of stannous octoate, raise the temperature to 80°C for 3 hours, add Congo red tetrahydrofuran solution at 110°C for 3 hours. The temperature is. Cool down to 70°C, add 10g of 1,4-butanediol-2-sodium sulfonate and 3g of diethylene glycol to react for 2h. 150g deionized water, disperse at high speed for 30 minutes. Raise the temperature to 80°C, remove the organic solvent at 0.6MPa, and filter to obtain the water-based polyurethane Congo red indicator. The water-based polyurethane Congo red indicator prepared in this example has a discoloration range of 3.5 to 5.2, red in the alkaline state, blue-purple i...

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Abstract

The invention discloses a waterborne polyurethane acidic polymer indicator and a preparation method thereof. The preparation method comprises the following steps: reacting polypolyols and excessive isocyanate, reacting with an indicator Congo red (CAS: 573-58-0), accessing the indicator Congo red onto a polyurethane molecular chain, introducing hydrophilic groups through a chain extension reaction, and finally preparing the waterborne polyurethane acidic polymer indicator by virtue of emulsification and solvent removal methods. The prepared waterborne polyurethane acidic polymer indicator hasthe characteristics of being excellent in storage stability, green, environmentally friendly, antibacterial, capable of preventing from pollution of samples under test and the like, and has the advantages of being convenient to use, capable of being repeatedly used, wide in application field and the like.

Description

technical field [0001] The invention relates to the technical field of acid indicators, in particular to a water-based polyurethane acid polymer indicator and a preparation method thereof. Background technique [0002] Small molecule indicators are a class of organic weak acids or organic weak bases with complex structures. The corresponding conjugate bases or conjugate acids have different colors, so they show different colors in solutions with different pHs. Small molecule indicators may pollute the test system, have certain toxic and side effects, and do not have the disadvantages of repeated use, which limits their application in many fields. [0003] The polymer indicator has the advantages of non-toxicity, environmental protection, no pollution to the measured solution, etc., and it is easy to use, can be used repeatedly, and has a wide range of applications. [0004] Waterborne polyurethane has been widely used in the fields of building materials, leather finishing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/48C08G18/42C08G18/38C08G18/32C08G18/12
CPCC08G18/12C08G18/3857C08G18/4277C08G18/4825C08G18/4854C08G18/755C08G18/7614C08G18/7671C08G18/3855C08G18/3206
Inventor 胡先海刘翔李根刘曼莉程从亮
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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