Low-molecular-weight polyurethane resin and application thereof in tackifying resin

A polyurethane resin, low molecular weight technology, applied to low molecular weight polyurethane resin and its application in tackifying resin, can solve the problems of no active group, inability to disperse, bulk crosslinking, etc., to control side reactions, reduce Condensation of reaction heat, the effect of slowing down the reaction

Active Publication Date: 2021-06-18
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention also has the problem that it does not contain active groups, and the body is cross-linked so that it cannot be dispersed, and it is still not suitable for tackifying resins.

Method used

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  • Low-molecular-weight polyurethane resin and application thereof in tackifying resin
  • Low-molecular-weight polyurethane resin and application thereof in tackifying resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 62.78g of 2-methyl-1,3-propanediol into the reaction vessel, protect it with nitrogen, stir and heat to 110°C, and vacuum above 0.099MPa to remove water for 2h. Lower the temperature of 2-methyl-1,3 propanediol to 60°C, stir at a speed of 550r / min, add 137.63g of diisocyanate three times, and wait for the temperature to drop below 70°C after each addition before adding the next one. After the addition is complete, the temperature is 80°C and the reaction is stirred for 2 hours, and then the finished product is obtained.

Embodiment 2

[0045] Add 127.34g of diethylene glycol into the reaction vessel, protect it with nitrogen gas, stir and heat to 110°C, and vacuum above 0.099MPa to remove water for 2h. Lower the temperature of diethylene glycol to 60°C, stir at a speed of 550r / min, and add 250.24g of diisocyanate three times. After each addition, wait for the temperature to drop below 70°C before adding the next time. After the addition is complete, the temperature is 80°C and the reaction is stirred for 2 hours, and then the finished product is obtained.

Embodiment 3

[0047] Add 90.10 g of triethylene glycol into the reaction vessel, protect it with nitrogen, stir and heat to 110° C., and vacuumize above 0.099 MPa to remove water for 2 hours. Lower the temperature of triethylene glycol to 60°C, stir at a speed of 550r / min, add 125.12g of diisocyanate three times, and wait for the temperature to drop below 70°C after each addition before adding the next time. After the addition is complete, the temperature is 80°C and the reaction is stirred for 2 hours, and then the finished product is obtained.

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Abstract

The invention belongs to the field of high polymer materials, and relates to low-molecular-weight polyurethane resin and an application thereof in tackifying resines. The low-molecular-weight polyurethane resin is prepared through the following steps: adding small-molecular-weight dihydric alcohol into a tank reactor, and heating, vacuumizing and dewatering under inert gas protection; and cooling the dehydrated dihydric alcohol material, adding diisocyanate for multiple times, adding the diisocyanate for the next time after the temperature is reduced to 70 DEG C or below after each time of addition, and continuing the reaction after the addition is finished to obtain the low-molecular-weight polyurethane resin. The molecular weight and the structure are adjustable, and the glass transition temperature can be selected as required. In addition, according to the low-molecular-weight polyurethane provided by the invention, cross-linking is greatly reduced by controlling a reaction process, so that the low-molecular-weight polyurethane is easily dispersed in polyol, a solvent and a polyurethane adhesive. In addition, the low-molecular-weight polyurethane provided by the invention contains active groups and can be chemically reacted with the adhesive, so that more excellent body strength of the adhesive is provided.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a low-molecular-weight polyurethane resin and its application in tackifying resins. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, in the field of polyurethane adhesives, it is common to add tackifying resins to improve the initial tack properties of polyurethane adhesives, and to adjust parameters such as viscosity, open time, and processing temperature. Currently used tackifying resins include petroleum resins, polyacrylates, rosin resins, phenolic resins, urea-formaldehyde resins, and polyurethane hot-melt adhesives. These tackifying resins general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/48C09J175/04C09J175/08C09J11/08
CPCC08G18/3206C08G18/3212C08G18/4854C09J175/04C09J175/08C09J11/08
Inventor 傅恺凡任光雷宋红玮刘德富潘靖恺
Owner MIRACLL CHEM
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