Modified dioscorea opposita thunb starch prepolymer and degradable polyurethane foam material prepared from prepolymer

A technology of starch prepolymer and prepolymer, which is applied in the field of polyurethane foam materials and can solve problems such as not being widely used

Active Publication Date: 2014-08-20
JIANGSU WELLCARE HOUSEHOLD ARTICLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the water sensitivity and brittleness of pure potato starch, its application is still not widespread, so it a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of modified Huai potato starch prepolymer comprises the following steps:

[0028] (1) In a 250 mL three-necked flask equipped with a thermometer, agitator and nitrogen protection, add 20 g of hexamethylene diisocyanate (HDI) and polycaprolactone (PCL220, hydroxyl value: 56 mgKOH / g, molecular weight 2000) ) 118.8g, start the stirrer, raise the temperature to 80°C, react at 80±2°C for 3 to 5 hours, and then degas under negative pressure until there are no bubbles to obtain polycaprolactone prepolymer.

[0029] (2) At 60-70°C, dissolve 100 mg of modified Huai potato starch and 1000 mg of polycaprolactone prepolymer obtained in step (1) in 100 ml of dimethyl sulfoxide solution, and each ml of dimethyl sulfoxide in Add mass 56mg catalyst NaCNBH 3 , the reaction was stirred for 2 to 3 days, and the same amount of NaCNBH was added every day during the reaction. 3 (ie 56mg). After the reaction is completed, the obtained mixed solution is cooled to room temper...

Embodiment 2

[0035] Example 2: Same as Example 1, wherein the modified Huaishu starch was added in an amount of 200 mg to obtain a prepolymer containing 20% ​​modified starch.

Embodiment 3

[0036] Example 3: Same as Example 1, wherein, the modified Huaishu starch was added in an amount of 300 mg to obtain a prepolymer containing 30% modified starch.

[0037] Table 1: Prepolymer performance index of modified starch obtained in Examples 1-3

[0038] Example 1 2 3 Viscosity (25℃, mPa.s) 650 734 965 equivalent 126 144 186

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PUM

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Abstract

The invention discloses a modified dioscorea opposita thunb starch prepolymer and a degradable polyurethane foam material prepared from the prepolymer. A preparation method of the modified dioscorea opposita thunb prepolymer comprises the following steps: (1) putting polyisocyanate and polycaprolactone, the molar ratio of which is 2: 1, into a container, reacting at the temperature of 80+/-2 DEG C for 3-5 hours, and then degrassing under a negative pressure till bubbles do not exist, thus obtaining a polycaprolactone prepolymer; and (2) dissolving modified dioscorea opposita thunb starch and the polycaprolactone prepolymer in a dimethylsulfoxide solution at the temperature of 60-70 DEG C, then adding a catalyst NaCNBH3, reacting for 2-3 days under a stirring condition, after ending reaction, cooling obtained mixed liquid to a room temperature, then dropwise adding the mixed liquid to methyl alcohol under a stirring condition so as to form precipitates, filtering to obtain the precipitates, and drying under reduced pressure so as to obtain the modified dioscorea opposita thunb starch prepolymer.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a biodegradable polyurethane foam material containing modified Huaishu starch. Background technique [0002] Polyurethane materials are widely used for their excellent mechanical strength, high elasticity, wear resistance, lubricity, fatigue resistance, biocompatibility, processability, etc., and the demand is increasing by 10% every year. However, the inability of polyurethane to be degraded in the natural state has caused more and more severe environmental pressure. All countries in the world have invested a lot of scientific and technological efforts in the research of degradable polyurethane. As a biodegradable material in renewable resources, it has adapted to The environmental protection requirements of environmental protection and sustainable development and the requirements of low-carbon economic growth have become the focus of research by researchers from all over the world. ...

Claims

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Application Information

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IPC IPC(8): C08B31/00C08G81/00C08G18/73C08G18/64C08G18/48C08J9/08C08G101/00
Inventor 李康相伟琳李梦石熊芒之
Owner JIANGSU WELLCARE HOUSEHOLD ARTICLES
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