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Poly(ethylene carbonate) type polyurethane water-based adhesive

A technology of polyethylene carbonate and water-based adhesives, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc. problems, to achieve the effect of excellent bonding strength, high storage stability, and broad market application space

Active Publication Date: 2011-06-15
HUIZHOU DAYAWAN DAZHI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are no research reports and industrial application examples of water-based polyurethane adhesives based on polyethylene carbonate polyols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of polyethylene carbonate type polyurethane aqueous adhesive is characterized in that, it is made by following method:

[0018] Take 100 parts by weight of dehydrated polyethylene carbonate diol, add 2-10 parts of dimethylol propionic acid, stir under nitrogen protection and slowly heat up to 100-120 ° C, wait for dimethylol propionic acid After the acid is completely dissolved, cool down to 50-70°C, add 20-60 parts of diisocyanate dropwise, raise the temperature to 70-80°C, and react for 2-3 hours. When the glue has a certain viscosity and becomes transparent, stop heating and let it cool naturally. At 40-50°C, stop the nitrogen flow, add 100-700 parts of 5-30% triethylamine aqueous solution under vigorous stirring, neutralize and emulsify, and obtain a milky white polyethylene carbonate polyurethane water-based adhesive.

[0019] The polyethylene carbonate diol described above is formed by copolymerizing carbon dioxide with ethylene oxide under the action of an...

Embodiment 2

[0024] Take 100 parts by weight of dehydrated polyethylene carbonate diol with a molecular weight of 3000, add 3 parts of dimethylol propionic acid, stir under nitrogen protection and slowly heat up to 110 ° C, and wait for the dimethylol propionic acid After it is completely dissolved, cool down to 50°C, add 30 parts of toluene diisocyanate dropwise, heat up to 70°C, and react for 2 hours. When the glue has a certain viscosity and becomes transparent, stop heating, cool naturally to 40°C, and stop nitrogen flow. Add 200 parts of 5% triethylamine aqueous solution under vigorous stirring, neutralize and emulsify, and obtain milky white polyethylene carbonate type polyurethane water-based adhesive.

[0025] The color of the prepared adhesive is milky white, and its mechanical stability is continuous centrifugation for 15 minutes at a speed of 3000 rpm with an 8000-type centrifuge without any separation. Freeze in a -40°C refrigerator, thaw at room temperature, and repeat 3 times...

Embodiment 3

[0027] Take 100 parts of dehydrated polyethylene carbonate diol with a molecular weight of 4000, add 2 parts of dimethylol propionic acid, stir under the protection of nitrogen and slowly heat up to 120 ° C, after the dimethylol propionic acid is completely dissolved , lower the temperature to 55°C, add 70 parts of diphenylmethane diisocyanate dropwise, raise the temperature to 80°C, and react for 2.5 hours. When the glue has a certain viscosity and becomes transparent, stop heating, cool naturally to 40°C, and stop nitrogen flow. Add 200 parts of 7% triethylamine aqueous solution under vigorous stirring, neutralize and emulsify, and obtain a milky white polyethylene carbonate type polyurethane water-based adhesive.

[0028] The color of the prepared adhesive is milky white, and its mechanical stability is continuous centrifugation for 15 minutes at a speed of 3000 rpm with an 8000-type centrifuge without any separation. Freeze in a -40°C refrigerator, thaw at room temperature...

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Abstract

The invention discloses a poly(ethylene carbonate) type polyurethane water-based adhesive which is prepared through the following method: taking 100 parts of poly(ethylene carbonate) diol according to parts by weight, adding 2-10 parts of dimethylol propionic acid, stirring and slowly raising temperature to 100-120 DEG C under nitrogen protection, reducing the temperature to 50-70 DEG C after dissolution, dropping 20-60 parts of diisocyanate, raising the temperature to 70-80 DEG C, reacting for 2-3 hours, stopping heating when glue solution has viscosity and is transparent, naturally cooling to 40-50 DEG C, stopping introducing nitrogen, adding 100-700 parts of 5-30% of catalyst water solution while stirring intensely, neutralizing, emulsifying and preparing the adhesive. As a large number of carbonate bonds are contained in molecules of poly(ethylene carbonate) polyol, the bonding strength of a product is high; simultaneously, the carbonate bonds are less prone to hydrolysis, the storage stability of the product is high. In addition, the poly(ethylene carbonate) polyol is prepared by copolymerizing carbon dioxide and epoxy ethane, the cost is low, and the poly(ethylene carbonate)type polyurethane water-based adhesive has broad market application space.

Description

technical field [0001] The invention relates to an adhesive, in particular to a polyethylene carbonate type polyurethane water-based adhesive. It belongs to the field of adhesives. Background technique [0002] Polyurethane adhesives are widely used in shoemaking, leather and other fields. Traditional polyurethane adhesives are mostly prepared with benzene, toluene, xylene, etc. as solvents, which are not only flammable, smelly, and pollute the environment. Long-term exposure can cause serious harm to the human body. Waterborne polyurethane adhesive is a new type of adhesive product that has received widespread attention in recent years. It is an adhesive formed by dissolving or dispersing polyurethane in water. Due to the use of water as the dispersion medium, it has the characteristics of non-flammability, low odor, no pollution to the environment, energy saving, and convenient operation and processing, which can effectively improve the working environment of employees a...

Claims

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Application Information

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IPC IPC(8): C09J175/04C08G18/66C08G18/44
Inventor 蔡志华
Owner HUIZHOU DAYAWAN DAZHI FINE CHEM
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