High initial strength reaction type polyurethane hot melt adhesive and preparation method thereof

Abstract

The invention discloses a high initial strength reaction type polyurethane hot melt adhesive and a preparation method thereof. The hot melt adhesive is prepared from the following raw materials in parts by weight: 60-90 parts of polyhydric alcohols, 5-40 parts of tackifying resins, 10-15 parts of isocyanate compounds, 0.1-1 part of catalyst and 0.1-1 part of adhesion promoter. The preparation method comprises the following steps: (1) adding polyhydric alcohols and tackifying resins into a reaction vessel, heating in vacuum, melting and dehydrating, thereby acquiring a mixture; (2) adding isocyanate compounds or isocyanate group terminated prepolymer compounds into the mixture acquired in the step (1) and then controlling temperature and performing polymerization reaction, thereby acquiringa polymer; (3) adding a catalyst and an adhesion promoter into the polymer acquired in the step (2), controlling temperature and reacting in vacuum; and (4) placing the prepared hot melt adhesive into a container and filling dry inert gas. The high initial strength reaction type polyurethane hot melt adhesive disclosed by the invention has the advantages of high initial strength, excellent temperature resistance and low production cost. The preparation method is simple and is easy for industrial production.

Description

technical field

[0001] The invention belongs to the technical field of reactive polyurethane hot melt adhesives, in particular to a high initial strength reactive polyurethane hot melt adhesive and a preparation method thereof. Background technique

[0002] Moisture-curing polyurethane hot-melt adhesive, referred to as PUR, is solid at room temperature and does not contain solvent plasticizers. When in use, it is heated to make it liquid and immediately applied to the surface of the adherend, and then attached to another adherend. When the adhesive is cooled and solidified, the isocyanate reacts with the moisture on the surface of the adherend or the moisture in the air to extend the chain into a polymer compound, thereby producing an adhesive force.

[0003] With the development of industrial automation, the production rhythm of the assembly line is accelerated. It is required that the adhesive surface can be bonded faster and firmer, and the gluing should be smooth and fas...

Examples

Embodiment 1

[0029] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0030] 60 parts of polyols with a number average molecular weight of 20,000 prepared by condensation of adipic acid and ethylene glycol

[0031] Tackifying resin petroleum resin 40 parts

[0032] Isocyanate compound diphenylmethane-4,4'-diisocyanate 10 parts

[0033] Catalyst dibutyltin dilaurate 0.1 parts

[0034] Adhesion promoter methacryloxypropyl siloxane 0.1 parts

[0035] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0036] Step 1: Add 60 parts by weight of a polyol with a number average molecular weight of 20,000 and 5 parts by weight of a tackifying resin petroleum resin prepared by condensation of adipic acid and ethylene glycol into the reaction vessel, heat to 80°C, and under vacuum conditions of -0...

Embodiment 2

[0041] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0042] Polyether polyol PPG220 25 parts

[0043] Polyester polyol Dynacoll 7360 31 parts

[0044] Epoxy modified polyester polyol 21 parts

[0045] Tackifying resin terpene phenolic modified resin TP-2040 5 parts

[0046] Isocyanate compound 4,4' diphenylmethane diisocyanate 13 parts

[0047] Catalyst dimorpholine diethyl ether 0.2 parts

[0048] Adhesion promoter methacryloxypropyl siloxane 0.5 parts

[0049] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0050] Step 1, add 25 parts by weight polyether polyol PPG220, 31 parts by weight polyester polyol Dynacoll 7360, 21 parts by weight epoxy modified polyester polyol and 5 parts by weight terpene phenolic modified resin TP-2040, heated to 100°C, melted and d...

Embodiment 3

[0055] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0056] Polyether polyol PPG220 20 parts

[0057] Polyester polyol Dynacoll 7360 21 parts

[0058] Acrylic modified polyester polyol 5 parts

[0059] Polyester polyol PH56 25 parts

[0060] Tackifying resin acrylic resin 15 parts

[0061] Isocyanate compound diphenylmethane-2,4'-diisocyanate 15 parts

[0062] Catalyst dibutyltin dilaurate 0.3 parts

[0063] Adhesion promoter methacryloxypropyl siloxane 1 part

[0064] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0065] Step 1, adding 20 parts by weight polyether polyol PPG220, 21 parts by weight polyester polyol Dynacoll 7360, 5 parts by weight acrylic modified polyester polyol, 25 parts by weight polyester polyol PH56, Heating to 90°C, melting and dehydrat...

technical field

[0001] The invention belongs to the technical field of reactive polyurethane hot melt adhesives, in particular to a high initial strength reactive polyurethane hot melt adhesive and a preparation method thereof. Background technique

[0002] Moisture-curing polyurethane hot-melt adhesive, referred to as PUR, is solid at room temperature and does not contain solvent plasticizers. When in use, it is heated to make it liquid and immediately applied to the surface of the adherend, and then attached to another adherend. When the adhesive is cooled and solidified, the isocyanate reacts with the moisture on the surface of the adherend or the moisture in the air to extend the chain into a polymer compound, thereby producing an adhesive force.

[0003] With the development of industrial automation, the production rhythm of the assembly line is accelerated. It is required that the adhesive surface can be bonded faster and firmer, and the gluing should be smooth and fas...

Examples

Embodiment 1

[0029] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0030] 60 parts of polyols with a number average molecular weight of 20,000 prepared by condensation of adipic acid and ethylene glycol

[0031] Tackifying resin petroleum resin 40 parts

[0032] Isocyanate compound diphenylmethane-4,4'-diisocyanate 10 parts

[0033] Catalyst dibutyltin dilaurate 0.1 parts

[0034] Adhesion promoter methacryloxypropyl siloxane 0.1 parts

[0035] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0036] Step 1: Add 60 parts by weight of a polyol with a number average molecular weight of 20,000 and 5 parts by weight of a tackifying resin petroleum resin prepared by condensation of adipic acid and ethylene glycol into the reaction vessel, heat to 80°C, and under vacuum conditions of -0...

Embodiment 2

[0041] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0042] Polyether polyol PPG220 25 parts

[0043] Polyester polyol Dynacoll 7360 31 parts

[0044] Epoxy modified polyester polyol 21 parts

[0045] Tackifying resin terpene phenolic modified resin TP-2040 5 parts

[0046] Isocyanate compound 4,4' diphenylmethane diisocyanate 13 parts

[0047] Catalyst dimorpholine diethyl ether 0.2 parts

[0048] Adhesion promoter methacryloxypropyl siloxane 0.5 parts

[0049] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0050] Step 1, add 25 parts by weight polyether polyol PPG220, 31 parts by weight polyester polyol Dynacoll 7360, 21 parts by weight epoxy modified polyester polyol and 5 parts by weight terpene phenolic modified resin TP-2040, heated to 100°C, melted and d...

Embodiment 3

[0055] The high initial strength reactive polyurethane hot-melt adhesive of the present embodiment is made up of the raw material of following parts by weight:

[0056] Polyether polyol PPG220 20 parts

[0057] Polyester polyol Dynacoll 7360 21 parts

[0058] Acrylic modified polyester polyol 5 parts

[0059] Polyester polyol PH56 25 parts

[0060] Tackifying resin acrylic resin 15 parts

[0061] Isocyanate compound diphenylmethane-2,4'-diisocyanate 15 parts

[0062] Catalyst dibutyltin dilaurate 0.3 parts

[0063] Adhesion promoter methacryloxypropyl siloxane 1 part

[0064] The preparation method of the high initial strength reactive polyurethane hot-melt adhesive of the present embodiment may further comprise the steps:

[0065] Step 1, adding 20 parts by weight polyether polyol PPG220, 21 parts by weight polyester polyol Dynacoll 7360, 5 parts by weight acrylic modified polyester polyol, 25 parts by weight polyester polyol PH56, Heating to 90°C, melting and dehydrat...

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