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Lignin modified cationic waterborne polyurethane (WPU) adhesive and preparation method thereof

A water-based polyurethane and lignin technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as poor adhesion

Active Publication Date: 2015-01-28
CHANGCHUN SANHUA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide lignin-modified cationic water-based polyurethane adhesive and preparation method thereof in order to solve the problem of poor cohesiveness of existing lignin-modified water-based polyurethane adhesive

Method used

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  • Lignin modified cationic waterborne polyurethane (WPU) adhesive and preparation method thereof
  • Lignin modified cationic waterborne polyurethane (WPU) adhesive and preparation method thereof
  • Lignin modified cationic waterborne polyurethane (WPU) adhesive and preparation method thereof

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preparation example Construction

[0028] The preparation method of lignin modified cationic waterborne polyurethane of the present invention comprises as follows:

[0029] Step 1: reacting the polymer diol with trimethylolpropane, and then reacting with polyisocyanate to obtain the first intermediate;

[0030] Step 2: reacting the first intermediate obtained in step 1 with a dihydroxy compound containing an amino group to obtain a second intermediate;

[0031] Step 3: react lignin and small molecule chain extender with the second intermediate obtained in step 2 to obtain lignin-modified cationic waterborne polyurethane.

[0032] In the first step, the polymer diol is first reacted with trimethylolpropane, the reaction temperature is preferably 110-120°C, the reaction time is preferably 1-2h, and the polymer diol is preferably Polybutylene adipate, polypropylene glycol or polycarbonate diol, more preferably polybutylene adipate, polypropylene glycol or polycarbonate with a molecular weight of 1000-5000 Daltons...

Embodiment 1

[0048] Add 1000g polybutylene adipate (molecular weight: 1000 Daltons) and 132g trimethylolpropane into the three-necked flask, raise the temperature to 110°C, depressurize for 1 hour, cool down to 85°C under nitrogen protection, and add 120ml of Butanone, drop 710g of 2,4-toluene diisocyanate, after the dropwise addition, react for 3.5 hours to obtain the first intermediate;

[0049] Add 80ml of butanone to the first intermediate, cool down to room temperature, and dropwise add 65g of N-methyldiethanolamine hydrophilic chain extender at a rate of 3ml / min. After the addition, react for 0.5 hours to obtain the second Intermediate;

[0050] Add 150ml of butanone to the second intermediate, add 86g of lignin and 106g of ethylene glycol, heat up to 90°C, react for 2 hours, add 1650ml of deionized water, then add 86g of concentrated hydrochloric acid, stir for 0.5 hours, reduce Butanone is removed under pressure to obtain lignin-modified cationic waterborne polyurethane.

Embodiment 2

[0052] Add 5000g of polybutylene adipate (molecular weight: 5000 Daltons) and 158g of trimethylolpropane into the three-neck flask, raise the temperature to 110°C, depressurize for 1 hour, cool down to 85°C under nitrogen protection, and add 180ml Butanone, dropwise added 960g of diphenylmethane-4,4'-diisocyanate, after the dropwise addition, reacted for 5 hours to obtain the first intermediate;

[0053] Add 160ml of butanone to the first intermediate, cool the temperature to room temperature, and drop 89g of N-(3-aminopropyl)diethanolamine hydrophilic chain extender at a rate of 5ml / min. After adding, react 1 hour, obtain the second intermediate;

[0054] Add 380ml of butanone to the second intermediate, add 158g of lignin and 185g of diethylene glycol, heat up to 90°C, react for 3 hours, add 2230ml of deionized water, then add 138g of concentrated hydrochloric acid, stir for 1 hour, reduce Butanone is removed under pressure to obtain lignin-modified cationic waterborne poly...

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Abstract

The invention provides a lignin modified cationic waterborne polyurethane (WPU) adhesive and a preparation method thereof, and belongs to the field of WPU adhesives and the lignin modified cationic WPU adhesive can be used for solving the problem that existing lignin modified WPU adhesives have poor adhesion. The adhesive comprises the following components in parts by weight: 100 parts of lignin modified cationic WPU, 0.015-0.032 parts of waterborne thickening agent, 0.018-0.026 parts of waterborne leveling agent, 8-16 parts of plasticizer and 5-9 parts of waterborne curing agent. The lignin modified cationic WPU adhesive has the beneficial effects that the lignin structure is introduced into a main polymer chain structure through polymerization reaction between phenolic hydroxy in lignin and polyisocyanate; the adhesion of the cationic waterborne adhesive is improved. The invention also provides the preparation method of the lignin modified cationic WPU adhesive. The shear strength of the adhesive can reach 2.83MPa and the tensile strength can reach 15.5MPa.

Description

technical field [0001] The invention belongs to the field of water-based polyurethane adhesives, in particular to a lignin-modified cationic water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Lignin is the second largest renewable resource in nature after cellulose. Industrial lignin is the main by-product of the pulping industry. The paper industry alone separates 50 million tons of lignin from plants every year. So far, more than 95% of lignin is still directly discharged into rivers as "black liquor", which has caused serious pollution to the environment. Therefore, it is very important to use lignin effectively. [0003] Water-based polyurethane is a kind of polymer that can be dispersed in water. Polymer materials for dispersion media. At present, it has been widely used in adhesives, coatings, leather finishing agents, fabric treatment agents, etc., among which it is the most widely used in the field of adhesives. Paten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J175/06C09J175/08C08G18/66C08G18/64
Inventor 张振久蒋舰刘凯蔡龙王振旅金朝君李春郁
Owner CHANGCHUN SANHUA IND
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