A kind of water-based polyurethane, preparation method and water-based polyurethane adhesive

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

Active Publication Date: 2018-06-15
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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  • A kind of water-based polyurethane, preparation method and water-based polyurethane adhesive
  • A kind of water-based polyurethane, preparation method and water-based polyurethane adhesive
  • A kind of water-based polyurethane, preparation method and water-based polyurethane adhesive

Examples

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preparation example Construction

[0041] The present invention provides a method for preparing an aqueous polyurethane described in the above technical solution, which includes the following steps:

[0042] Step 1: Under the protection of inert gas, react poly(carbonate-ether) glycol and diisocyanate 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: reacting the fourth intermediate obtained in step four with sodium diaminosulfonate to obtain waterborne polyurethane.

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

Embodiment 1

[0068] Example 1 Preparation of propylene carbonate and diamine ring-opening diol:

[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, and wash the product with 150mL of ethylene glycol butyl ether and 200mL of ethanol. The product was vacuum dried at 35°C for 72h to obtain a ring-opening diol of propylene carbonate and ethylenediamine.

[0070] figure 1 This is the electrospray mass spectrometry of the propylene carbonate and ethylenediamine ring-opening diol prepared in Example 1 of the present invention; according to the mass spectrometry results, 287.3 (product + Na, ethylenediamine molecular weight 60, propylene carbonate molecular weight 102) nearby The strong peak, that is, the molecular weight of the product is 264, indicating that the product is a ring-opening diol of propylene carbonate and ethylenediamine.

Embodiment 2

[0071] Example 2 Preparation of propylene carbonate and diamine ring-opening diol:

[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 propylene carbonate and hexamethylene diamine ring-opening diol.

[0073] figure 2 This is the electrospray mass spectrometry of the propylene carbonate and hexamethylene diamine ring-opening diol prepared in Example 2 of the present invention; according to the mass spectrometry results, only 343.4 (product + Na, molecular weight of hexamethylene diamine 116, molecular weight of propylene carbonate 102) There is a peak, that is, the molecular weight of the product is 320, indicating that the product is a ring-opening diol of propylene carbonate an...

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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 adhesives and preparations thereof, and specifically relates to a water-based polyurethane, a preparation method and a water-based polyurethane adhesive. Background technique [0002] As a new 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, the price of diisocyanate has been continuously falling, resulting in the current price of polyurethane strongly dependent on the price of raw materials such as polymer polyols. Invention patent 201210086834X discloses a preparation method of poly(carbonate-ether) polyol, which uses a rare earth-doped double metal cyanide as a catalyst and a carboxylic acid as a chain transfer agent to copolyme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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