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Low-melt-viscosity thermoplastic polyurethane hot melt adhesive and preparation method thereof

A thermoplastic polyurethane, low melt viscosity technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of high melt viscosity and limited application range of thermoplastic polyurethane hot melt adhesives, and achieve high Effects of cohesive strength and mechanical strength, expansion of application range, and reduction of intermolecular forces

Active Publication Date: 2015-12-30
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, and provides a low melt viscosity thermoplastic polyurethane hot melt adhesive and its preparation method, in order to solve the problems of high melt viscosity and limited application range of thermoplastic polyurethane hot melt adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 50g polyethylene glycol (molecular weight 1000), 40g polyethylene glycol (molecular weight 8000), 5g polytetrahydrofuran glycol PTMG (molecular weight 1000), 5g polysulfide rubber (molecular weight 800) in the reactor, heat up under nitrogen protection Dehydrate at 100°C to 110°C until no water evaporates, cool down to 65°C, weigh 15.6g of 4,4'-diphenylmethane diisocyanate MDI according to the isocyanate index of 1.0, melt it and add it evenly into the reaction kettle within 2 hours , after the feeding is completed, the reaction temperature is controlled at 83°C to 85°C, and when the viscosity increases, add 0.5g of dibutyltin dilaurate, react for 2h, add a chain extender (chain extender and polyester polyol, polyether polyol 1. The total molar ratio of polysulfide rubber is 0.3) ethylene glycol 1.2g; react until the reactant becomes thick and stop heating, and the polyurethane hot-melt adhesive is obtained after discharging. The melt viscosity of the hot melt adhes...

Embodiment 2

[0022] Add 93g of phthalic anhydride polyester polyol (molecular weight 2000), 5g polytetrahydrofuran glycol PTMG (molecular weight 2000), 2g polysulfide rubber (molecular weight 2000) into the reaction kettle, heat up to 120 ℃ ~ 126 ℃ under nitrogen protection to dehydrate to nothing Steam out, cool down to 55°C, weigh 11.9g of 4,4'-diphenylmethane diisocyanate MDI according to the isocyanate index of 0.95, melt it and add it into the reaction kettle evenly within 1.5h, and control the reaction temperature after the addition is completed. 80℃~81℃, when the viscosity increases, add 0.5g dibutyltin dilaurate, react for 2.5h, add chain extender (total molar ratio of chain extender to polyester polyol, polyether polyol, polysulfide rubber 0.2) 0.6 g of ethylene glycol; react until the reactant is viscous, stop heating, and discharge to obtain a polyurethane hot melt adhesive. The melt viscosity of the hot melt adhesive at 80°C is 13.3Pa.S, the melt viscosity at 180°C is 4.2Pa.S, ...

Embodiment 3

[0024] Add 80g of phthalic anhydride polyester polyol (molecular weight 2000), 10g polyoxypropylene glycol PPG (molecular weight 1000), and 10g polysulfide rubber (molecular weight 5000) into the reaction kettle, and heat up to 126°C to 130°C under nitrogen protection to dehydrate to Steam out without water, cool down to 60°C, weigh 12.4g of 4,4'-diphenylmethane diisocyanate MDI according to the isocyanate index of 0.98, melt it and add it into the reaction kettle evenly within 1h, and control the reaction temperature after the addition is completed. 75°C~78°C, when the viscosity increases, add 0.5g of dibutyltin dilaurate, react for 3h, add chain extender (the total molar ratio of chain extender to polyester polyol, polyether polyol, and polysulfide rubber is 0.3) Propylene glycol 1.2g; react until the reactant is viscous, stop heating, and discharge to obtain a polyurethane hot melt adhesive. The melt viscosity of the hot melt adhesive at 90°C is 15.2Pa.S, the melt viscosity...

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Abstract

The invention discloses a low-melt-viscosity thermoplastic polyurethane hot melt adhesive and a preparation method thereof; the low-melt-viscosity thermoplastic polyurethane hot melt adhesive is prepared from raw materials of polyester polyol, polyether glycol, polysulfide rubber, diisocyanate, a catalyst and a chain extender in proportion, and the concrete method comprises the steps: carrying out high temperature dehydration on polyester polyol, polyether glycol and polysulfide rubber, then carrying out a reaction with diisocyanate at the temperature of 60+ / -5 DEG C for 1-2 h, next carrying out a reaction at the temperature of 80+ / -5 DEG C until the viscosity is increased, then adding a catalyst, continuing to carry out a reaction for 2-3 h, adding the chain extender, stopping heating when the reactant is thickened, becomes shiny and can be wire-drawn, and thus obtaining the product. The prepared low-melt-viscosity thermoplastic polyurethane hot melt adhesive has the melt viscosity of lower than 5 Pa*S / 180 DEG C, has the bonding shear strength on aluminum Ly-12 of more than 4 MPa, can be used for large-area bonding and encapsulation, can meet the demand of conventional bonding and encapsulation, and expands an application scope of the polyurethane hot melt adhesive.

Description

technical field [0001] Embodiments of the present invention relate to the field of polymer adhesives, and more specifically, embodiments of the present invention relate to a low-melt viscosity thermoplastic polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] The use of bonding technology to realize the connection between components can not only avoid deformation, stress concentration, and overall strength loss caused by riveting, welding and other connection methods, but also shorten the assembly cycle and reduce weight. Therefore, adhesives have been widely used. Adhesives can be divided into two categories: thermosetting and thermoplastic. Thermoplastic adhesives have the function of being disassembled after bonding, especially some precision parts need to be replaced after bonding due to parts aging, damage and other reasons. The use of thermoplastic adhesives makes partial replacement of parts possible, which not only saves upda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C08G18/66C08G18/48C08G18/42
Inventor 廖宏王浩旭冉志鹏
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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