Waterborne polyurethane hot melt adhesive as well as preparation method and application thereof

A technology of water-based polyurethane and hot melt adhesive, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of large consumption of liquid nitrogen and electricity, short hot water washing time, and high melting temperature. Achieve the effects of saving electricity, high solid content, and low melting temperature

Inactive Publication Date: 2015-09-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also a large number of literature reports that due to the liquid nitrogen low-temperature freezing and crushing process used in the preparation of powder hot melt adhesives, a large amount of liquid nitrogen and electricity are consumed, and the energy consumption is relatively high.
[0005] The Chinese invention patent application with the publication number CN103554415 discloses the preparation method of water-based polyurethane hot melt adhesive, but in the preparation process, polyester polyol and polyether diol are used at the same time, resulting in the final melting temperature being too high and the solid content too low , the hot water washing time is too short, and the peeling force is relatively small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of water-based polyurethane hot melt adhesive, comprising the steps of:

[0038] (1) Weigh 40 parts by mass of polyoxypropylene glycol (1000) in a dry and clean four-necked flask, heat up to 120°C, and keep warm for 2.5 hours to remove water;

[0039] (2) Cool down the polyoxypropylene diol after water removal to 75°C, and evenly add 0.02 parts by mass of di Dibutyltin laurate, then add 30 parts by mass of isophorone diisocyanate at one time, wait until the temperature in the bottle is stable, raise the temperature to 80°C, and keep the temperature for 2.0h;

[0040] (3) Weigh 6 parts by mass of dimethylolpropionic acid, fully dissolve it in 18 parts by mass of N-methyl-2-pyrrolidone, and pump it dropwise with a constant flow pump (the drop rate is 20 drops / min) into the step (2) In the four-necked flask, the dropping time was controlled to be 20 minutes. After completion, the temperature in the bottle was adjusted to 80° C., and the reaction was c...

Embodiment 2

[0045] A preparation method of water-based polyurethane hot melt adhesive, comprising the steps of:

[0046](1) Weigh 50 parts by mass of polytetrahydrofuran diol (2000) in a dry and clean four-necked flask, heat up to 130° C., keep warm for 2.5 hours to remove water, and obtain polytetrahydrofuran diol after water removal;

[0047] (2) The polytetrahydrofuran diol after dehydration is cooled to 85 ℃, and under the condition of stirring (the rotating speed of stirring is 120r / min), the polytetrahydrofuran diol four-necked flask after dewatering is equipped with in step (1) Add 0.04 parts by mass of triethylenediamine dropwise, and then add 40 parts by mass of hexamethylene diisocyanate into the flask at one time. After the temperature in the bottle is stabilized, adjust the temperature to 80°C and keep the temperature for 2.5 hours;

[0048] (3) Take 8 parts by mass of dimethylol propionic acid, fully dissolve in 20 parts by mass of dimethyl carbonate, and pump it dropwise int...

Embodiment 3

[0053] A preparation method of water-based polyurethane hot melt adhesive, comprising the steps of:

[0054] (1) Weigh 45 parts by mass of ethylene glycol (2000) into a dry and clean four-necked flask, heat up to 125°C, and keep warm for 2.5 hours to remove water;

[0055] (2) Cool the ethylene glycol after dehydration to 77°C, and under the condition of stirring (stirring speed is 110r / min), add the ethylene glycol after dehydration to step (1). Add 0.03 parts by mass of dibutyltin dilaurate dropwise to the flask, and then add 35 parts by mass of 2,4-toluene diisocyanate into the flask at one time. After the temperature in the bottle is stabilized, adjust the temperature to 85°C and keep the temperature for 2.2 hours;

[0056] (3) Weigh 7 parts by mass of dimethylolpropionic acid, fully dissolve it in 17.5 parts by mass of N-methyl-2-pyrrolidone, and pump it dropwise into the four-necked flask of step (2) by a constant flow pump, and control the dropwise The addition time is...

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Abstract

The invention belongs to the technical field of hot melt adhesives, and discloses a waterborne polyurethane hot melt adhesive as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) adding polyether polyol in a reaction kettle, heating to 120-130 DEG C, and carrying out heat preservation, water removal and cooling; (2) under the condition of stirring, dropwise adding a catalyst into the reaction kettle and then adding polyisocyanate, heating to 80-88 DEG C, and carrying out a heat preservation reaction to obtain a mixture; (3) dropwise adding a carboxylic monomer solution into the mixture, adjusting the temperature, and carrying out heat preservation reaction to obtain a crude product; (4) adding acetone into the crude product, increasing the rotating speed of a stirrer, cooling to 35-40 DEG C, adding a neutralizing agent for neutralization, taking out the obtained material, adding distilled water, and conducting high-speed shearing emulsification and rotating evaporation to obtain the waterborne polyurethane hot melt adhesive. The waterborne polyurethane hot melt adhesive provided by the invention is low in melt temperature, and high in solid content and stripping force, and remains in a liquid state at normal temperature; meanwhile, the preparation method is mild in reaction condition and low in energy consumption; the waterborne polyurethane hot melt adhesive is applied to the field of adhesives.

Description

technical field [0001] The invention belongs to the technical field of hot-melt adhesives, relates to a polyurethane hot-melt adhesive, in particular to a water-based polyurethane hot-melt adhesive and its preparation method and application. Background technique [0002] Hot melt adhesive is a kind of plastic adhesive. Its physical state changes with temperature within a certain temperature range, but its chemical properties remain unchanged. The paint is non-toxic and tasteless, and it is an environmentally friendly chemical product. Hot-melt adhesive bonding is to use a hot-melt adhesive machine to melt the hot-melt adhesive through heat, and the glue after the sol becomes a liquid, which is sent to the surface of the adhered object through the hot-melt adhesive tube and hot-melt adhesive gun of the hot-melt adhesive machine , After the hot melt adhesive cools, the bonding is completed. Commonly used hot-melt adhesives are made of ethylene-vinyl acetate (EVA), polyester, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/75C08G18/66C08G18/48C08G18/34C08G18/73C08G18/76
Inventor 涂伟萍方增滨胡剑青王锋
Owner SOUTH CHINA UNIV OF TECH
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