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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 problems such as poor peel strength, poor tensile strength, and water-based polyurethane adhesives that cannot get rid of petrochemical resources. Achieve the effect of overcoming poor water resistance and increasing bonding performance

Active Publication Date: 2013-04-17
吉林天泽二氧化碳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent 201110028348.8 discloses a preparation method of a one-component high heat-resistant water-based polyurethane adhesive. The peel strength of the water-based polyurethane adhesive prepared by the method is better, but its tensile strength is relatively poor; Chinese patent 200710032437.3 discloses multiple The preparation method of modified self-crosslinking water-based polyurethane adhesive, the water-based polyurethane adhesive prepared by the method has higher tensile strength, but its peel strength is poor
In addition, the oligomer diols of the waterborne polyurethane structure in these two patents are all polyester diols such as polyethylene adipate diol and poly-1,4-butylene adipate diol. Alcohols, the raw materials used in the synthesis of such polyester diols are petrochemical products, so the water-based polyurethane adhesives prepared from them cannot get rid of the dependence on petrochemical resources

Method used

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

Examples

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preparation example Construction

[0046] The present invention also provides a kind of preparation method of waterborne polyurethane adhesive, comprises the following steps:

[0047] A) After removing water from poly(carbonate-ether) diol and trimethylolpropane having the structure of formula (II), react with diisocyanate in a solvent to obtain the first intermediate;

[0048] B) reacting the first intermediate with a catalyst and dimethylolpropionic acid in a solvent to obtain a second intermediate;

[0049] C) reacting the second intermediate with ethylene glycol in a solvent to obtain the third intermediate;

[0050] D) reacting the third intermediate with dimethylethanolamine to obtain an aqueous polyurethane dispersion;

[0051] E) reacting the water-based polyurethane dispersion with a water-based thickener, a water-based leveling agent, a water-based defoamer, a plasticizer, an antioxidant and a water-based curing agent to obtain a water-based polyurethane adhesive;

[0052] The mass ratio of the poly(c...

Embodiment 1

[0068] According to the method of Example 11 disclosed in patent 201210086834.X, a poly(carbonate-ether) glycol with a number average molecular weight of 1500 Daltons was prepared.

[0069] 1500 g of poly(carbonate-ether) glycol with a number average molecular weight of 1500 Daltons and 132 g of trimethylolpropane were placed in a three-necked flask, and were distilled under reduced pressure for 1 hour at 110°C. Under the protection of nitrogen, the temperature was lowered to 85° C., 220 mL of butanone was added, and 870 g of 2,4-toluene diisocyanate was added dropwise, and the mixture was reacted for 2.5 hours to obtain the first intermediate.

[0070] Dissolve the first intermediate in 100mL of methyl ethyl ketone, lower the temperature to 75°C, add 0.002g of dibutyltin dilaurate, add 130g of dimethylolpropionic acid in three times, after the addition is complete, react for 0.5 hours to obtain the second intermediate body.

[0071] The second intermediate was dissolved in 1...

Embodiment 2

[0079] A poly(carbonate-ether) glycol with a number average molecular weight of 2000 Daltons was prepared according to the method of Example 9 disclosed in patent 201210086834.X.

[0080] 2000 g of the prepared poly(carbonate-ether) glycol with a number average molecular weight of 2000 Daltons and 158 g of trimethylolpropane were placed in a three-necked flask, and were distilled under reduced pressure for 1 hour at 110°C. Under the protection of nitrogen, the temperature was lowered to 85° C., 360 mL of butanone was added, and 1250 g of diphenylmethane-4,4′-diisocyanate was added dropwise to react for 4 hours to obtain the first intermediate.

[0081] Dissolve the first intermediate in 280 mL of methyl ethyl ketone, lower the temperature to 75°C, add 0.003 g of stannous octoate, and add 165 g of dimethylol propionic acid three times. After the addition, react for 2 hours to obtain the second intermediate.

[0082] The second intermediate was dissolved in 380 mL of butanone, a...

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Abstract

The invention provides a waterborne polyurethane adhesive which comprises polyurethane with a structure of a formula (I). The invention also provides a method for preparing the waterborne polyurethane adhesive. The polyurethane provided by the invention is prepared by reacting poly (carbonate ester-ether) with a structure of a formula (II) with trimethylolpropane, diisocyanate, dyhydroxy methyl acrylic acid, ethylene glycol and dimethyl ethanolamine. The poly (carbonate ester-ether) dihydric alcohol has a polyester structure and a polyether structure, the defects that the polyester is poor in water resistance and the polyether is poor in mechanical performance are overcome, a prepared polyurethane main chain is provided with a polyester unit and a polyether unit through a copolymerization reaction, and the adhesion performance is improved.

Description

technical field [0001] The invention relates to the technical field of water-based adhesives, in particular to a water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Water-based polyurethane is a kind of polymer material with water as the dispersion medium, which is formed by chain extension of diisocyanate, oligomer diol, hydrophilic diol, and small molecule diol. The oligomer binary Alcohols are the soft segments in the polyurethane structure. Waterborne polyurethane has become a research hotspot at home and abroad because of its advantages such as good low temperature resistance, good flexibility, high bond strength, non-combustibility, non-toxicity, no environmental pollution, safety and reliability, energy saving and environmental protection. At present, it has been widely used in adhesives, coatings, leather finishing agents, fabric treatment agents and other fields, among which it is most widely used in the fields of adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/48C08G18/32C08G18/34C08G18/12
Inventor 张红明李冬威王献红李季王佛松
Owner 吉林天泽二氧化碳科技有限公司
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