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Degradable polyurethane and preparation method thereof

A polyurethane and polyester diol technology, which is applied in the field of polymer materials and synthesis, can solve the problems of no degradable polyurethane and achieve the effects of solving white pollution, good strength, and improving degradation performance

Inactive Publication Date: 2014-07-09
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no related research on the preparation of degradable polyurethane by using carbon dioxide and propylene oxide copolymer-polypropylene carbonate polyol as the degradation source.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] The preparation method of degradable polyurethane of the present invention is specifically implemented according to the following steps:

[0056] Step 1, weighing raw materials:

[0057] Weigh the following raw materials according to mass percentage:

[0058]Polypropylene carbonate polyol 5.30%~38.00%, polyester diol 0~31.00%, polyether diol 0~15.50%, diisocyanate 9.20%~13.50%, catalyst 0.02%~0.04%, chain extension Agent 1.80% ~ 3.10%, organic solvent 50.00%, the total content of the above components is 100%;

[0059] Step 2, using the polypropylene carbonate polyol, polyester diol, and polyether diol weighed in step 1 to prepare three precursors respectively, select one of the precursors and put it into the reaction container for Vacuum dehydration treatment to obtain the dehydrated precursor:

[0060] Step 2.1, prepare three kinds of precursors, the preparation methods of the three kinds of precursors are respectively:

[0061] Directly take the polypropylene carb...

Embodiment 1

[0078] Weigh the following raw materials according to mass percentage:

[0079] Polypropylene carbonate polyol (molecular weight: 3100) 38.00%, isophorone diisocyanate 9.80%, dibutyltin dilaurate 0.02%, 1,4-butanediol 2.18%, isopropanol 50.00%, above The sum of the contents of the components is 100%;

[0080] Add the weighed polypropylene carbonate polyol as precursor A into a reaction vessel connected with a stirring device, heat up the polypropylene carbonate polyol in the reaction vessel to 120°C, and then carry out vacuum dehydration treatment. The time of the vacuum dehydration treatment is 30min. After the vacuum dehydration treatment is completed, the polypropylene carbonate polyol is cooled to 50° C. to obtain the dehydrated polypropylene carbonate polyol;

[0081] Add the weighed isophorone diisocyanate and dibutyltin dilaurate into the dehydrated polypropylene carbonate polyol, stir evenly, then raise the temperature to 78°C, and keep the temperature for 150min to o...

Embodiment 2

[0084] Weigh the following raw materials according to mass percentage:

[0085] Polypropylene carbonate polyol (molecular weight 2000) 5.31%, polyester diol (polyethylene adipate glycol 1,4-butylene glycol ester diol, molecular weight 2000) 30.86%, toluene diisocyanate 10.74%, Dibutyltin dilaurate 0.04%, 1,4-butanediol 3.05%, isopropanol 50.00%, the total content of the above components is 100%;

[0086] The precursor B formed by the weighed polypropylene carbonate polyol and polyethylene adipate glycol 1,4-butylene glycol ester diol is added in the reaction vessel connected with the stirring device, and the After the temperature of the precursor B was raised to 100°C, the vacuum dehydration treatment was carried out. The time of the vacuum dehydration treatment was 30 minutes. After the vacuum dehydration treatment was completed, the temperature of the precursor B was lowered to 30°C to obtain the dehydrated precursor B;

[0087] Add the weighed toluene diisocyanate and dibu...

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PUM

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Abstract

The invention provides degradable polyurethane. The degradable polyurethane comprises the following raw materials by mass: 5.30 to 38.00% of poly(propylene carbonate) polyol, 0 to 31.00% of polyester dihydric alcohol, 0 to 15.50% of polyether dihydric alcohol, 9.20 to 13.50% of diisocyanate, 0.02 to 0.04% of a catalyst, 1.80 to 3.10% of a chain extender and 50.00% of an organic solvent, wherein the contents of the above-mentioned raw materials sum to 100%. The invention further discloses a preparation method for the polyurethane. The method comprises the following steps: preparing three precursors from weighed raw materials, selecting one of the three precursors, putting the selected precursor in a reaction vessel, subjecting the precursor to vacuum-pumping and dehydration so as to obtain a dehydrated precursor and then mixing diisocyanate, the catalyst and the dehydrated precursor so as to obtain a prepolymer; and mixing the organic solvent, the chain extender and the prepolymer so as to obtain the degradable polyurethane. The degradable polyurethane provided by the invention has good storage stability, excellent film properties and good degradability.

Description

Technical field: [0001] The invention belongs to the technical field of polymer materials and synthesis methods, and relates to a degradable polyurethane, and also relates to a preparation method of the above-mentioned degradable polyurethane. Background technique [0002] Polyurethane is an extremely important class of polymer materials. Due to its unique structure and excellent performance, polyurethane materials are widely used in the fields of construction, industry, agriculture, national defense and aviation. The degradation performance of polyurethane materials in the traditional sense is poor. With the wide application of polyurethane materials, the "white pollution" brought by its waste has caused a serious threat to the environment and human activities. [0003] Polyurethane materials prepared by conventional polyether and polyester polyols have excellent physical and chemical properties, but have the disadvantage of poor degradation performance. Therefore, it is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/44
CPCC08G18/4018C08G18/44C08G18/664C08G18/6674C08G2230/00
Inventor 徐成书邢建伟苏广召刘海艳任燕
Owner XI'AN POLYTECHNIC UNIVERSITY
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