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Room temperature curing low-viscosity polyurethane foam adhesive and preparation method thereof

A technology of polyurethane foam and room temperature curing, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., to achieve moderate dryness, simple operation, and easy operation

Inactive Publication Date: 2010-06-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to solve the problems existing in the existing room temperature moisture-curing foam adhesives, and to provide a low-viscosity polyurethane foam adhesive cured at room temperature, which can undergo foaming and curing reactions at 10-30°C, and can be operated Simple, Inexpensive, Moderately Dry

Method used

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  • Room temperature curing low-viscosity polyurethane foam adhesive and preparation method thereof

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specific Embodiment approach

[0037] The following examples are given to describe the present invention in more detail. It is necessary to point out that the following examples cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art will make some non-essential aspects of the present invention according to the above-mentioned content of the present invention. Improvements and adjustments should still belong to the protection scope of the present invention.

[0038] In addition, it is also worth noting that the parts of materials used in the examples in the table are all parts by weight, MDI is diphenylmethane diisocyanate, and TDI is toluene diisocyanate.

Embodiment 1-10

[0040] First, add polyoxypropylene glycol with a number average molecular weight of 2000 into the reaction kettle, stir and raise the temperature at the same time. When the temperature of the liquid rises to 75°C, open the vacuum system to gradually increase the vacuum degree in the kettle to 80mmHg. The temperature in the reaction kettle was maintained at 110° C. for 4 hours until the water content of the polyoxypropylene diol in the kettle was below 0.06%, then heating and vacuuming were stopped.

[0041] Add the dehydrated polyoxypropylene glycol into the reaction kettle, stir and slowly raise the temperature to 60-70°C, then slowly add the measured MDI and TDI into the kettle, and control the temperature in the kettle at 60-70°C. 70°C, react for 3 to 4 hours after the dropwise addition, and cool to room temperature. Then add morpholine catalysts and ethylene glycol, stir and mix evenly, discharge the material and put it in a dry iron drum or plastic cylinder, and store it ...

Embodiment 11-22

[0045] First, the number average molecular weight is 1000 polyester diol, the number average molecular weight is 2000 polyoxypropylene diol and the number average molecular weight is 6000 polyoxypropylene trihydric alcohol is added in the reactor, stirring and heating up at the same time, wait When the temperature of the liquid rises to 80°C, turn on the vacuum system to gradually increase the vacuum in the kettle to 100mmHg, control the temperature in the reactor at 120°C, and keep it for 3 hours until the water content of the polyoxypropylene glycol in the kettle reaches Below 0.06%, stop heating and vacuuming.

[0046] Add the dehydrated polyester diol, polyoxypropylene diol and polyoxypropylene triol into the reaction kettle, then add the hydrogenated terpene resin, stir and slowly raise the temperature to 60-70°C, and then the metered Slowly add the MDI into the kettle dropwise, and control the temperature in the kettle at 60-70°C, react for 3-4 hours after the dropwise a...

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Abstract

The invention discloses a room temperature curing low-viscosity polyurethane foam adhesive consisting of polyurethane prepolymer and a morpholine catalyst. The viscosity of the adhesive is less than 600 mPa.S; in the presence of water or moisture at the temperature of between 10 and 30 DEG C, isocyanate in the polyurethane prepolymer, catalyzed by the morpholine catalyst, reacts with water or is condensed and polymerized to form CO2 gas which is foamed and cured to form a foam body; and the volume density of the foam body is 21 to 27Kg / m<3> or 15 to 29Kg / m<3>. The invention also discloses a preparation method for the adhesive. The polyurethane foam adhesive provided by the invention not only has low viscosity, good storage stability and high initial adhesion and adhesion strength of an adhesive surface, but also has low price, simple operation and moderate dryness in use, and is a new product in the field of room temperature wet curing foam adhesives.

Description

technical field [0001] The invention belongs to the technical field of foam adhesives and preparation methods thereof, and specifically relates to a reaction monomer with isocyanate, polyester polyol, polyether polyol, polyol, polyamine, etc., and water as a foaming agent. The morpholine compound is a curing catalyst, a low-density, low-viscosity non-solvent type polyurethane foam adhesive that is rapidly and automatically foamed and cured at room temperature and a preparation method thereof. Background technique [0002] Because the aerospace industry needs to use a large number of high-strength low-density foam materials as filling or structural components, and some cutting-edge electronic components are increasingly using various low-density foam materials, so the bonding of such foam materials is very important. appears to be very important. In these special fields, in addition to requiring good bonding performance, it is also required that the adhesive itself can be a ...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/06C09J9/00
Inventor 殷勤俭沙静江波林坤华
Owner SICHUAN UNIV