Method for modifying anionic waterborne polyurethane emulsion with carboxyl nanocellulose

A nanocellulose, water-based polyurethane technology, applied in cellulose adhesives, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of nanocellulose self-agglomeration, poor dispersion, and incompatibility of interfaces To improve mechanical properties and water resistance, improve hardness and mechanical properties

Active Publication Date: 2021-07-23
湖北福力德鞋业有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect that this new polymer improves on both strengths when used alone or with other materials for various applications such as bonding agents are explained through addition of certain types of nanosized cellulosic material (CNC) into specific chemical groups within the molecule called cathode-active amine group). This results in better performance without compromising their overall durability over time.

Problems solved by technology

This patents describes how adding certain molecules like amino acids, sugars, polysaccharides, proteins, etc., along with nanoplastic resin particles helps create strong composites that resist deformation under stress without losing their original shape over time due to factors such as moisture content and pressure changes during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) get 0.5g microcrystalline cellulose (MCC) and 50g mass fraction 10wt% sodium persulfate solution and mix uniformly;

[0034] Put the mixed solution in a water bath, stir and sonicate at a temperature of 60°C, the ultrasonic power is 800W, the time is 2.5h, and the ultrasonic temperature is not higher than 70°C;

[0035] Then add 500g of deionized water to stop the reaction to obtain a milky white suspension;

[0036] The milky white suspension was then centrifuged at a high speed of 9000r / min for 10 minutes, the supernatant was discarded, and an appropriate amount of deionized water was added to mix evenly, and then centrifuged. After repeated 5 times, the solution was washed until neutral, and the bottom of the centrifuge tube was Translucent carboxyl nanocellulose colloidal solution;

[0037] Take a small amount of carboxyl nanocellulose colloidal solution and calculate its mass fraction by drying method to be 4.5wt%;

[0038] 2) Take 100g of sulfonic acid water-...

Embodiment 2

[0042] 1) get 5g microcrystalline cellulose (MCC) and 500g mass fraction and mix homogeneously with 10wt% sodium persulfate solution;

[0043] Place in a water bath, carry out stirring and ultrasonic treatment at a temperature of 65°C, the ultrasonic time is 3 hours, the ultrasonic power is 1000W, and the ultrasonic temperature is not higher than 70°C;

[0044] Then add 5000g of deionized water to stop the reaction to obtain a milky white suspension;

[0045] Centrifuge the milky white suspension at a centrifugal speed of 10000r / min for 10min at a high speed, discard the supernatant, add an appropriate amount of deionized water to mix evenly, and then centrifuge. After repeated 7 times, the solution is washed until neutral, and the bottom of the centrifuge tube is milky white. Carboxylated nanocellulose colloidal solution, get a small amount of carboxylated nanocellulose colloidal solution and calculate its solid content 5wt% by drying method;

[0046] 2) Take 200g of sulfoni...

Embodiment 3

[0050] 1) get 3g microcrystalline cellulose (MCC) and 300g mass fraction and be 10wt% sodium persulfate solution and mix;

[0051] Place in a water bath, carry out stirring and ultrasonic treatment at a temperature of 55°C, the ultrasonic time is 2 hours, the ultrasonic power is 800W, and the ultrasonic temperature is not higher than 70°C;

[0052] Then add 300g of deionized water to stop the reaction to obtain a milky white suspension;

[0053] Centrifuge the milky white suspension at a high speed of 9000r / min for 10 minutes, discard the supernatant, add an appropriate amount of deionized water to mix evenly, and then centrifuge. After repeated 5 times, the solution is washed until neutral, and the bottom of the centrifuge tube is translucent. Carboxylated nanocellulose colloidal solution, get a small amount of carboxylated nanocellulose colloidal solution and adopt drying method to calculate its solid content 3wt%;

[0054] 2) Stir and mix 80 g of carboxylic acid-based aque...

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Abstract

The invention relates to the technical field of material modification, and discloses a method for modifying anionic waterborne polyurethane emulsion with carboxyl nanocellulose. The method comprises the following steps: 1) oxidizing microcrystalline cellulose with sodium persulfate to prepare carboxyl nanocellulose, and forming carboxyl nanocellulose dispersion liquid; (2) mixing the carboxyl nanocellulose dispersion liquid obtained in the step (1) with an anionic waterborne polyurethane emulsion; and (3) carrying out ultrasonic treatment on the carboxyl nanocellulose dispersion liquid obtained in the step (2) and the anionic waterborne polyurethane mixed emulsion to obtain the stable carboxyl nanocellulose modified anionic waterborne polyurethane emulsion. The method of the invention has the advantage of simple preparation process and is easy for industrial production; and the carboxyl nanocellulose is added into the anionic waterborne polyurethane, so the mechanical properties and the water resistance of the anionic waterborne polyurethane can be further improved.

Description

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Claims

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Application Information

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Owner 湖北福力德鞋业有限责任公司
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