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A kind of modified moisture curing polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, moisture-curing technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc. Ease of construction

Active Publication Date: 2018-01-02
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 method for preparing a 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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  • A kind of modified moisture curing polyurethane hot melt adhesive and preparation method thereof

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Experimental program
Comparison scheme
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 three-necked flask In the process of stirring, heat to 120-130°C, and dehydrate at a constant temperature at an absolute pressure of 80-150Pa 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), reacted at 90~100°C and absolute pressure of 80~100Pa for 45min then, 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 three-necked flask In the process of stirring, heat to 120-130°C, and dehydrate at a constant temperature at an absolute pressure of 80-150Pa for 2.0h, then cool down to 90°C, and pass nitrogen to normal pressure; add 2,4'-MDI ( 67.63g), catalyst stannous octoate (0.38g), then reacted for 45min at 90~100°C and absolute pressure of 80~100Pa, and 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 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 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

Disclosed in the present invention is a method for preparing a modified wet-cured polyurethane hot melt adhesive, relating to the technical field of polyurethane adhesive synthesis. The inventiveness of the present invention is characterised in terms of: using pentaerythritol diacrylate and modifying traditional wet-cured polyurethane hot melt adhesives; as said acrylate, containing two hydroxyl groups, can act as a chain extender, adjusting the amount of pentaerythritol diacrylate and controlling the viscosity of a target product within a reasonable range causes the target product to be advantageous for construction and to have a satisfactory initial adhesion; in addition, as the modifier contains short-chain functional group acrylates, the final stripping strength of the target product is also superior to traditional conventional products.

Description

technical field [0001] The invention discloses a modified moisture-curing polyurethane hot-melt adhesive and a preparation method thereof, belonging 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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