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

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Examples

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Example Embodiment

[0016] Example 1

[0017] A polyethylene carbonate type polyurethane water-based adhesive, which is characterized in that it is prepared by the following method:

[0018] Take 100 parts by weight of the dehydrated polyethylene carbonate diol, add 2-10 parts of dimethylolpropionic acid, stir under the protection of nitrogen and slowly raise the temperature to 100~120℃, wait until the dimethylolpropionic acid After all the acid is dissolved, the temperature is reduced to 50~70℃, 20~60 parts of diisocyanate are added dropwise, the temperature is raised to 70~80℃, and the reaction is 2~3 hours. When the glue has a certain viscosity and appears transparent, stop heating and cool naturally When the temperature reaches 40-50°C, stop the nitrogen flow, and add 100-700 parts of 5-30% triethylamine aqueous solution under vigorous stirring to neutralize and emulsify to obtain a milky white polyethylene carbonate type polyurethane water-based adhesive.

[0019] The polyethylene carbonate diol i...

Example Embodiment

[0023] Example 2

[0024] Take 100 parts by weight of the dehydrated polyethylene carbonate glycol with a molecular weight of 3000, add 3 parts of dimethylolpropionic acid, stir under the protection of nitrogen and slowly raise the temperature to 110℃, and wait until the dimethylolpropionic acid After all is dissolved, the temperature is lowered to 50°C, 30 parts of toluene diisocyanate are added dropwise, the temperature is raised to 70°C, and the reaction is carried out for 2 hours. When the glue has a certain viscosity and becomes transparent, stop heating, naturally cool to 40°C, and stop nitrogen gas. Add 200 parts of a 5% triethylamine aqueous solution under vigorous stirring to neutralize and emulsify to obtain a milky white poly(ethylene carbonate) polyurethane water-based adhesive.

[0025] The prepared adhesive is milky white in color and mechanical stability: continuous centrifugation with an 8000 centrifuge at 3000 rpm for 15 minutes without separation. Frozen in the r...

Example Embodiment

[0026] Example 3

[0027] Take 100 parts of dehydrated polyethylene carbonate glycol with a molecular weight of 4000, add 2 parts of dimethylolpropionic acid, stir under the protection of nitrogen and slowly raise the temperature to 120℃, and wait until the dimethylolpropionic acid is completely dissolved , Cool down to 55°C, add 70 parts of diphenylmethane diisocyanate dropwise, heat up to 80°C, react for 2.5 hours, when the glue has a certain viscosity and become transparent, stop heating, cool naturally to 40°C, stop nitrogen gas, Add 200 parts of a 7% triethylamine aqueous solution under vigorous stirring to neutralize and emulsify to prepare a milky white poly(ethylene carbonate) polyurethane water-based adhesive.

[0028] The prepared adhesive is milky white in color and mechanical stability: it is continuously centrifuged for 15 minutes with an 8000 centrifuge at a speed of 3000 revolutions per minute, without separation. Frozen in the refrigerator at -40℃, thawed at room t...

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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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