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Waterborne polyurethane adhesive and preparation method thereof

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor substrate adhesion and poor substrate wettability, and achieve good wettability, The effect of good adhesive properties

Active Publication Date: 2013-04-03
吉林天泽二氧化碳科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The hydrophilic chain extenders used in the water-based polyurethane adhesives reported by the above-mentioned patents are dimethylol propionic acid, dimethylol butyric acid or dimethylol acetic acid, and the neutralizers used are all triethylamine or Triethanolamine, thus all obtained anionic water-based polyurethane dispersions are used as water-based adhesive matrix resins. However, such anionic water-based polyurethane dispersions have poor wettability to substrates, and the prepared polyurethane adhesives have poor adhesion to substrates. Difference

Method used

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  • Waterborne polyurethane adhesive and preparation method thereof
  • Waterborne polyurethane adhesive and preparation method thereof

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preparation example Construction

[0049] The present invention also provides a kind of preparation method of waterborne polyurethane adhesive, comprises the following steps:

[0050] A) Mix oligomer polyol, rosin pentaerythritol ester, and trimethylolpropane, dehydrate, then mix and react with polyisocyanate to obtain the first intermediate;

[0051] B) mixing and reacting the first intermediate obtained in step A) with a diethanolamine derivative to obtain a second intermediate;

[0052] C) mixing and reacting the second intermediate obtained in step B) with ethylene glycol, and then adding a neutralizing agent to obtain a cationic water-based polyurethane;

[0053] D) Mix the cationic water-based polyurethane obtained in step C) with a water-based leveling agent, a water-based defoamer and a non-ionic water-based thickener, stir, and then add a water-based polyisocyanate curing agent to obtain a water-based polyurethane adhesive.

[0054] First, the oligomer polyol, rosin pentaerythritol ester and trimethyl...

Embodiment 1

[0068] Mix 120g of rosin resin and 0.2g of zinc oxide in a 250mL three-necked flask with mechanical stirring, introduce nitrogen gas, and when heated to 270°C, add 62g of pentaerythritol to the reaction system, stir for 5h, and after the reaction is over, reduce the pressure for 1.5h , steaming off unreacted pentaerythritol and low boilers to obtain rosin pentaerythritol ester.

Embodiment 2

[0070] The number-average molecular weight of polyethylene adipate 400g of 2000 Daltons, the rosin pentaerythritol ester 142g and trimethylolpropane 26.8g prepared in Example 1 were mixed in a there-necked flask, and the temperature was raised to 110° C. Then, under the protection of nitrogen, the temperature of the reaction system was lowered to 85 ° C, and 220 mL of butanone was added, and 210 g of 2,4-toluene diisocyanate was added dropwise to the reaction system. an intermediate.

[0071] 100 mL of butanone was added to the first intermediate, the temperature of the reaction system was lowered to 30° C., and 23.8 g of N-methyldiethanolamine was added dropwise thereto. After the dropwise addition, the reaction was carried out for 0.5 hours to obtain the second intermediate.

[0072] To the second intermediate, 150 mL of butanone was added, then 24.5 g of ethylene glycol was added, the reaction system was heated to 90°C, and the reaction was performed for 2 hours. After the ...

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Abstract

The invention provides a waterborne polyurethane adhesive which comprises cationic waterborne polyurethane prepared by adopting the steps of carrying out condensation reaction on oligomer polyhydric alcohol, rosin pentaerythritol ester, trimethylolpropane, a diethanol amine derivative and polyisocyanates, blocking by ethylene glycol, and cationizing by a neutralizing agent, wherein the rosin pentaerythritol ester is introduced into a polyurethane structure main chain to ensure that the waterborne adhesive has better initial adhesion; and meanwhile, a polyhydric alcohol compound trimethylolpropane and dihydric alcohol amine hydrophilic chain extender are introduced into a main chain structure to obtain a cationic waterborne polyurethane adhesive with an internal crosslinking structure, wherein the cationic waterborne polyurethane adhesive has better wetting property to ensure that the waterborne polyurethane adhesive has better adhering property. The adhering property of the waterborne polyurethane adhesive is tested. Results indicate that the adhesive film tensile strength of the waterborne polyurethane adhesive provided by the invention reaches 13,4MPa, and the initial adhesion strength of the waterborne polyurethane adhesive reaches 0.63N / mm.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an aqueous polyurethane adhesive and a preparation method thereof. Background technique [0002] The automotive industry has become the largest adhesive application field after construction and light industry. The application of lightweight metals, composite materials and plastics in automobiles has led to a continuous increase in the amount of adhesives used. Most of the currently used adhesives are solvent-based adhesives. It contains a large amount of toxic and harmful volatile organic substances such as benzene and toluene, and the organic solvent is flammable and explosive, which not only causes serious waste of resources, but also seriously pollutes the environment and endangers human health. Therefore, the non-organic solvation of polyurethane adhesives is the direction of the efforts of all countries in the world. [0003] Among them, the water-based polyurethane adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/06C09J175/08C08G18/66C08G18/64C08G18/42C08G18/48C08G18/32
Inventor 张红明李冬威赵强李季王献红王佛松
Owner 吉林天泽二氧化碳科技有限公司
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