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Preparation method of modified moisture-curable polyurethane hot melt adhesive

A polyurethane hot-melt adhesive and moisture-curing technology, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low initial and final adhesive strength and low initial adhesive force, and achieve Ease of construction

Active Publication Date: 2016-01-20
SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN201310469047.8 discloses a preparation method of moisture-curing reactive polyurethane hot melt adhesive for textiles, but the initial bonding strength and final bonding strength are relatively low, especially when the initial bonding force is less than 1N / 2.5 when gluing for 10 minutes. cm; Chinese patent CN201410691126.8 discloses a PTMG modified moisture-curing polyurethane hot-melt adhesive and its preparation method. By adding a polytetrahydrofuran fan PTMG to PUR, the final adhesive strength of PUR is increased, and the viscosity of PUR is reduced at the same time. Although the low-viscosity PUR is convenient for sizing operations, the initial tack is still low. Its initial tack is 1.12N / 2.5cm after 10 minutes of gluing, which cannot meet the relatively high requirements for initial tack and final tack. specific application areas

Method used

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  • Preparation method of modified moisture-curable polyurethane hot melt adhesive

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Experimental program
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Effect test

Embodiment 1

[0017] Weigh polyether 1000 (100g), polyether 4000 (72g), polyhexamethylene adipate diol (96g), terpene resin (80.1g), antioxidant CHINOX1010 (2.22g), add to a three-necked flask In the process of stirring, heat to 120-130°C, and dehydrate at a constant temperature of 80-150Pa under absolute pressure for 2.0h, then cool down to 90°C, and pass nitrogen to normal pressure; add 4,4'-MDI ( 85.65g), catalyst stannous octoate (0.44g), then reacted at 90-100°C and 80-100Pa absolute pressure for 45min, then passed nitrogen to normal pressure, and added pentaerythritol diacrylate (8.54g) under nitrogen protection, React for 1.0h at 95-105°C and absolute pressure 80-100Pa to obtain a prepolymer;

[0018] The above-mentioned prepolymer was discharged under nitrogen protection, sealed and packaged, and aged in an environment of 85° C. for 6 hours. The obtained sample number is P1.

Embodiment 2

[0020] Weigh polyether 1000 (100g), polyether 4000 (40g), polyhexamethylene adipate diol (69g), terpene resin (86.95g), antioxidant CHINOX1010 (1.89g), add to a three-necked flask In the process of stirring, it is heated to 120-130°C, and dehydrated at a constant temperature of 80-150Pa under absolute pressure for 2.0h, then cooled to 90°C, and nitrogen is passed to normal pressure; under the protection of nitrogen, add 2,4'-MDI ( 67.63g), catalyst stannous octoate (0.38g), then reacted for 45min at 90-100°C and 80-100Pa absolute pressure, then passed nitrogen to normal pressure, and added pentaerythritol diacrylate (12.2g) under nitrogen protection, React for 1.0h at 95-105°C and absolute pressure 80-100Pa to obtain a prepolymer;

[0021] The above-mentioned prepolymer was discharged under nitrogen protection, sealed and packaged, and aged in an environment of 85° C. for 6 hours. The obtained sample number is P2.

Embodiment 3

[0023] Weigh polyether 1000 (100g), polyether 4000 (80g), polyhexamethylene adipate diol (60g), terpene resin (113.1g), antioxidant CHINOX1010 (2.26g), add to a three-necked flask In the process of stirring, it is heated to 120-130°C, and dehydrated at a constant temperature of 80-150Pa under absolute pressure for 2.0h, then cooled to 90°C, and nitrogen is passed to normal pressure; under the protection of nitrogen, add 2,2'-MDI ( 86.94g), catalyst stannous octoate (0.45g), then reacted at 90-100°C and 80-100Pa absolute pressure for 45min, then passed nitrogen to normal pressure, and added pentaerythritol diacrylate (9.76g) under nitrogen protection, React for 1.0h at 95-105°C and absolute pressure 80-100Pa to obtain a prepolymer;

[0024] The above-mentioned prepolymer was discharged under nitrogen protection, sealed and packaged, and aged in an environment of 85° C. for 6 hours. The obtained sample number is P3.

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Abstract

The invention discloses a preparation method of a modified moisture-curable polyurethane hot melt adhesive and belongs to the technical field of synthesis of polyurethane adhesives. The preparation method of the modified moisture-curable polyurethane hot melt adhesive has the innovations that pentaerythritol diacrylate is applied for modifying the traditional moisture-curable polyurethane hot melt adhesive, the pentaerythritol diacrylate can serve as a chain extender as two hydroxyls are contained, usage amount of the pentaerythritol diacrylate is regulated, viscosity of a target product is controlled to be in a reasonable range, so that the pentaerythritol diacrylate is convenient for construction and has satisfactory initial adhesion; and meanwhile, the pentaerythritol diacrylate modifier contains a short branched chain functional group acrylate, so that final peeling strength of the target product is also better than that of the traditional conventional product.

Description

technical field [0001] The invention discloses a preparation method of a modified moisture-curing polyurethane hot-melt adhesive, which belongs to the technical field of polyurethane adhesive synthesis. Background technique [0002] Moisture-curing polyurethane adhesive is a reactive adhesive. Its adhesive mechanism not only includes the adhesive force contributed by the intermolecular force, but also because the -NCO group in it reacts with the moisture diffused into the colloid to generate active hydrogen. Amino groups, and then react with -NCO groups to produce urea groups, and then form a cross-linked structure to achieve adhesion to the substrate. The colloid after bonding and curing not only cannot be melted again, but also the bonding strength of the glue is greatly enhanced because the active components in the colloid react with the corresponding active components in the base material. [0003] With the improvement of people's living standards, the requirements and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C08G18/42C08G18/48C08G18/32C08G18/66
CPCC08G18/32C08G18/42C08G18/48C08G18/66C09J175/06C09J175/08
Inventor 曾作祥曹盛李哲龙朱万育
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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