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Waterborne polyurethane, preparing method and waterborne polyurethane adhesive

A technology of water-based polyurethane and degree of polymerization, applied in the field of water-based polyurethane, water-based polyurethane adhesives, and preparation, can solve the problems of high hard segment content and brittle polyurethane

Active Publication Date: 2016-07-06
HUNAN BENAN YADA NEW MATERIALS
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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 solve the problem that the existing method of synthesizing polyurethane uses a large amount of diisocyanate to cause the hard segment content to be too high, and the obtained polyurethane is very brittle, and to provide a water-based polyurethane, a preparation method and a water-based polyurethane adhesive

Method used

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  • Waterborne polyurethane, preparing method and waterborne polyurethane adhesive
  • Waterborne polyurethane, preparing method and waterborne polyurethane adhesive
  • Waterborne polyurethane, preparing method and waterborne polyurethane adhesive

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preparation example Construction

[0041] The present invention provides a kind of preparation method of waterborne polyurethane described in above-mentioned technical scheme, comprises the following steps:

[0042] Step 1: under the protection of inert gas, poly(carbonate-ether) glycol and diisocyanate are reacted to obtain the first intermediate;

[0043] Step 2: reacting dimethylolpropionic acid, a catalyst and the first intermediate obtained in step 1 to obtain a second intermediate;

[0044] Step 3: reacting the second intermediate obtained in step 2 with a novel glycol chain extender to obtain a third intermediate;

[0045] Step 4: reacting the third intermediate obtained in step 3 with triethylamine to obtain the fourth intermediate;

[0046] Step five: react the fourth intermediate obtained in step four with sodium disulfamate to obtain water-based polyurethane.

[0047] According to the present invention, under the protection of nitrogen or argon inert gas, poly(carbonate-ether) glycol and diisocyana...

Embodiment 1

[0068] Preparation of embodiment 1 propylene carbonate and diamine ring-opening dihydric alcohol:

[0069] Put 196g of propylene carbonate and 60g of ethylenediamine into a flask, add 490g of dichloromethane, heat and stir at 45°C for 26h, remove the dichloromethane under reduced pressure, wash the product with 150mL of ethylene glycol butyl ether and 200mL of ethanol, The product was vacuum-dried at 35°C for 72 hours to obtain ring-opened diols of propylene carbonate and ethylenediamine.

[0070] figure 1 For the electrospray mass spectrum of propylene carbonate and ethylenediamine ring-opening diol prepared in Example 1 of the present invention; according to the mass spectrum results, there is The strong peak, that is, the molecular weight of the product is 264, indicating that the product is a ring-opened dihydric alcohol of propylene carbonate and ethylenediamine.

Embodiment 2

[0071] Preparation of embodiment 2 propylene carbonate and diamine ring-opening dihydric alcohol:

[0072] Put 203g of propylene carbonate and 116.2g of 1,6-hexanediamine into the flask, add 480g of dichloromethane, heat and stir at 68°C for 15h, remove the dichloromethane under reduced pressure, and use 320mL of ethylene glycol butyl ether, The product was washed with 410 mL of ethanol, and the product was vacuum-dried at 55° C. for 24 hours to obtain the ring-opened diol of propylene carbonate and hexamethylenediamine.

[0073] figure 2 For the electrospray mass spectrum of propylene carbonate and hexamethylenediamine ring-opening diol prepared in Example 2 of the present invention; according to the mass spectrum results, there are only 343.4 (product+Na, hexamethylenediamine molecular weight 116, propylene carbonate molecular weight 102) There is a peak, that is, the molecular weight of the product is 320, indicating that the product is a ring-opened diol of propylene car...

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Abstract

The invention provides waterborne polyurethane, a preparing method and a waterborne polyurethane adhesive, and belongs to the field of polyurethane adhesives and preparation thereof. The problem that hard segment content is high as a great deal of diisocyanate is used in an existing polyurethane synthesis method, and therefore obtained polyurethane is crisp is solved. Waterborne polyurethane is of the structure shown in the formula (I), and the invention further provides the preparing method of waterborne polyurethane. The invention further provides the waterborne polyurethane adhesive prepared with waterborne polyurethane serving as matrix resin, the release force of an adhesive film of the waterborne polyurethane adhesive is 255-310 N / cm, after four circular high and low temperature impact and humidity and thermal tests, edge warping and adhesive failure of the adhesive film are avoided, and the release force is 190-260 N / cm.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesive and its preparation, and in particular relates to a water-based polyurethane, a preparation method and the water-based polyurethane adhesive. Background technique [0002] As an emerging polymer material, polyurethane is known as the "fifth largest plastic". Because of its excellent performance, it is widely used in foaming, coatings, adhesives and other fields. However, the price of polyurethane materials has remained high. Its main cost depends on the high price of diisocyanate raw materials. In recent years, with the continuous decline of the price of diisocyanate, the current price of polyurethane is strongly dependent on the price of raw materials such as polymer polyols. Invention patent 201210086834X discloses a preparation method of poly(carbonate-ether) polyol, using a rare earth-doped double metal cyanide as a catalyst, carboxylic acid as a chain transfer agent, and carbon dioxide an...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C09J175/08C09J11/04C07C269/04C07C271/20
CPCC07C269/04C08G18/0823C08G18/10C09J11/04C09J175/08C08G18/348C08G18/3831C08G18/3857C08L75/04C08K13/02C08K2003/265C08K3/34C08K2003/2241C08K3/36C07C271/20
Inventor 张红明董艳磊付双滨李颖王献红王佛松
Owner HUNAN BENAN YADA NEW MATERIALS
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