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Method for preparing oxidative crosslinked starch modified waterborne polyurethane hybridization material

A technology of oxidized cross-linked starch and water-based polyurethane, applied in polyurea/polyurethane coatings, starch derivative coatings, coatings, etc., can solve problems such as large ones, increase storage period, improve stability, and reduce production costs Effect

Inactive Publication Date: 2009-04-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polymer Engineering and Science, 2000, 40:1200~1210 reported that after starch was liquefied in polypropylene glycol (PPG), it reacted with toluene-2-4-diisocyanate to form starch-modified polyurethane, but it was mainly aimed at non-aqueous systems , and the tensile strength of the material after film formation is only 4MPa, obviously there is still a large distance from practical application
At the same time, in addition to the mechanical properties, the water resistance and mold resistance of materials are currently the bottlenecks affecting the large-scale production of starch materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 20 grams of polyoxypropylene diol (GE220, hydroxyl value: 56mgKOH / g, molecular weight: 2000) and 8.88 grams of isophorone diisocyanate (IPDI), then add 1.34 grams of dimethylolpropionic acid and 0.01 grams of diisocyanate Diisobutyltin laurate (T-12), heat and stir, raise the temperature to about 80°C, then react at a constant temperature of about 80°C for 3 to 4 hours, then lower the temperature to 60°C, add 1.01 g of triethylamine, and react for about 30 minutes Finally, add 4.86 grams of perchloric acid oxidized starch under high-speed stirring, and finally continue to drop 87 grams of deionized water and 1.2 grams of ethylenediamine to extend the chain. After the addition, continue stirring at 40 ° C for about 1 hour to discharge. White oxidized cross-linked starch modified water-based polyurethane PU-S-15 aqueous dispersion with blue light can be obtained, and its solid content is about 30% (wherein the mass of oxidized cross-linked starch accounts for 15% of ...

Embodiment 2

[0024] Weigh 20 grams of polyoxypropylene glycol (GE220, hydroxyl value: 56mgKOH / g, molecular weight 2000) and 12.18 grams of isophorone diisocyanate (IPDI), then add 1.34 grams of dimethylol propionic acid and 0.18 grams ( 0.5%) tetramethylbutanediamine, heated and stirred, raised the temperature to about 30°C, then reacted at a constant temperature of about 30°C for 3 to 4 hours, then lowered the temperature to 20°C, added 0.1 g of triethylamine for neutralization, and reacted for about 30 Minutes later, add 5.75 grams of potassium permanganate oxidized starch dropwise under high-speed stirring, and finally continue to drop 9.89 grams of deionized water and 0.026 grams of hexamethylenediamine for chain extension. Hours of discharge, white oxidized cross-linked starch modified water-based polyurethane PU-S-17 aqueous dispersion with blue light can be obtained, and its solid content is about 80% (the mass of oxidized cross-linked starch accounts for about 17% of the water-based...

Embodiment 3

[0026]Weigh 20 grams of polyoxypropylene diol (GE220, hydroxyl value: 56 mgKOH / g, molecular weight 2000) and 6.7 grams of toluene diisocyanate (TDI), then add 0.134 grams of dimethylol propionic acid and 0.009 grams of dilauric acid di Isobutyltin (T-12), heat and stir, raise the temperature to about 60°C, then react at a constant temperature of about 60°C for 3 to 4 hours, then lower the temperature to 40°C, add 0.1 g of diethanolamine for neutralization, and react for about 30 minutes. Add 5.51 g of hydrogen peroxide oxidized starch dropwise under high-speed stirring, and finally add 380.1 g of deionized water and 0.62 g of 1,4-butanediol chain extension dropwise. After the dropwise addition, continue stirring at 40°C for about 1 hour After discharging, the oxidized cross-linked starch modified water-based polyurethane PU-S-20 aqueous dispersion with white bluish light can be obtained, and its solid content is about 8% (wherein the mass of oxidized cross-linked starch account...

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Abstract

The present invention relates to a method for preparing an oxygenated crosslinked starch modified water polyurethane hybridization material. The method is characterized in that high molecular weight polyhydric alcohol with molecular weight of between 350 and 20,000, polyisocyanate, carboxyl-contained small molecule polyhydric alcohol are added into a four-opening bottle in which a stirrer, a reflux condenser tube, a thermometer and a feeding device are arranged; a catalyst with water polyurethane of which the total solid mass is between 0 and 0.5 percent is added; the temperature is increased to between 30 and 110 DEG C; an isothermal reaction is carried out for 3 to 4 hours; the temperature is reduced to 60 DEG C; a neutralizer is added to react for 30 minutes; the oxidized starch with the water polyurethane of which the total solid weight is between 1 and 50 percent is added under high speed stirring; finally, deionzing and chain extender with the water polyurethane of which the total solid weight is between 20 and 92 percent is continuously added dropwise for extending chains; and after the dropwise adding, the product is continuously stirred for about 1 hour at a temperature of 40 DEG C, and the oxygenated crosslinked starch modified water polyurethane dispersed solution is obtained. The method has the advantages that the solid content of the modified PU material is improved, and the compatibility between the oxygenated crosslinked starch and the water polyurethane is improved as well.

Description

technical field [0001] The invention relates to a preparation method of an oxidized cross-linked starch modified waterborne polyurethane hybrid material with high solid content, stable storage, and good water resistance and mechanical properties after film formation. The cost of the oxidized starch modified waterborne polyurethane dispersion is Low cost, green environmental protection and other advantages. Background technique [0002] Polyurethane (PU) materials are a class of polymer materials with excellent properties, widely used in light industry, textile, medical and other fields, and have become one of the world's six synthetic polymer materials. However, while the extensive use of polyurethane is improving people's lives, people are also paying close attention to the negative impact of the depletion of petroleum resources and the negative impact of its waste on the environment. In accordance with the spirit of the International Environmental Protection Law, the thre...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L3/10C08J3/24C08G18/10C09D175/04C09D103/10
Inventor 杨冬亚邱凤仙
Owner JIANGSU UNIV
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