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Preparation method of light/humidity dual-curing polyurethane hot melt adhesive

A polyurethane hot-melt adhesive, dual-curing technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low curing degree, poor wetting force, and not particularly large strength. , to achieve the effect of increasing the initial strength, prolonging the opening time, and shortening the opening time

Inactive Publication Date: 2013-09-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The one-component moisture-curing polyurethane hot melt adhesive has a high melting viscosity and good initial strength, but the softening point of the adhesive is not too high, and the positioning time is long, which has not yet met the requirements for rapid assembly, and it still needs to be cured in the warehouse for several days before it can be released. Goods; although the UV curing adhesive cures quickly, it also leads to a low degree of curing. The fast curing also makes the strength not particularly large, the wetting force is poor, and the flexibility is not particularly good because of the addition of reactive diluents. , these shortcomings can be solved by light / moisture dual-curing polyurethane (PU)-polyurethane acrylate (PUA) adhesives, balancing the shortcomings of the two, while having the typical advantages of both

Method used

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  • Preparation method of light/humidity dual-curing polyurethane hot melt adhesive
  • Preparation method of light/humidity dual-curing polyurethane hot melt adhesive

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Preparation of mixed isocyanate 3HDI-1HEA / HDI

[0039] Add HDI trimer (6.00g, 0.01mol, 21% isocyanate content, Nippon Polyurethane Industry Co., Ltd.) into a four-neck flask with a stirrer, dropping funnel, condenser and thermometer, and keep it warm at 60°C , the speed is controlled at 120r / min, and N 2 Exclude water vapor and protect the reaction, add 0.04g of p-hydroxyanisole (polymerization inhibitor), 0.007g of dibutyltin dilaurate (reaction catalyst) in the four-necked flask, drop the metered HEA (1.16g, 0.01mol ), control the temperature rise not to exceed 70°C. After the dropwise addition, raise the temperature to 90°C, react at the reaction temperature for 3 hours, then stop heating (the product number at this time: 3HDI-1HEA, the preparation reaction equation is as follows), and immediately add the measured amount of HDI (6.75g, 0.04mol, isocyanide Acid radical content 49.8%), after stirring evenly, the discharge is sealed and set aside, product number: 3...

Embodiment 2

[0047] 1) Preparation of mixed isocyanate 3HDI-1HEA / TDI-100

[0048] Add HDI trimer (6.00g, 0.01mol, 21% isocyanate content, Nippon Polyurethane Industry Co., Ltd.) into a four-neck flask with a stirrer, dropping funnel, condenser and thermometer, and keep it warm at 60°C , the speed is controlled at 120r / min, and N 2 Exclude water vapor and protect the reaction, add 0.04g of p-hydroxyanisole (polymerization inhibitor), 0.007g of dibutyltin dilaurate (reaction catalyst) in the four-necked flask, drop the metered HEA (1.16g, 0.01mol ), control the temperature rise not to exceed 70°C. After the dropwise addition, raise the temperature to 90°C, react at the reaction temperature for 3 hours, then stop heating (the product number at this time: 3HDI-1HEA), and immediately add the measured TDI-100 (6.97g, 0.04mol, isocyanate content 48.2 %), stir evenly and then discharge and seal, ready for use, product number: 3HDI-HEA / TDI-100, wherein the molar ratio of 3HDI-1HEA to TDI-100 is 2...

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Abstract

The invention relates to a preparation method of a light / humidity dual-curing polyurethane hot melt adhesive. The preparation method comprises the following steps of: introducing N2 into an HDI (hexamethylene diisocyanate) tripolymer, removing water vapor, carrying out a protective reaction, respectively adding a polymerization inhibitor and a catalyst and dropwisely adding HEA (hydroxyethyl acrylate); after dropwisely adding and reacting, adding polyisocyanate, and stirring uniformly to obtain 3HDI-HEA / polyisocyanate; heating and fusing polyalcohol and stirring for dehydration; adding the 3HDI-HEA / polyisocyanate and the catalyst; discharging after reacting, packaging the sample with an aluminum foil bag for standby application to obtain a light / humidity dual-curing polyurethane hot melt adhesive prepolymer; melting the prepolymer, and adding a photoinitiator, a polymerization inhibitor, a plasticizer and the catalyst, stirring uniformly in a molten state, rising the temperature and removing air bubbles; and ending stirring and discharging to obtain the light / humidity dual-curing polyurethane hot melt adhesive. The obtained hot melt adhesive has high initial bonding strength and final strength.

Description

Technical field: [0001] The invention belongs to the technical field of hot-melt adhesives, in particular to a preparation method of light / moisture dual-curing polyurethane hot-melt adhesives. Background technique: [0002] Light / moisture dual-curing polyurethane adhesive is based on polyurethane prepolymer, and contains polyurethane adhesives of light-induced curing and moisture-curing methods. Because the light-induced curing reaction is faster and more efficient than the moisture-curing reaction, the two curing methods are carried out in stages. , showing dual cure. Photocuring makes the viscosity of the system rise instantly after exposure to light, and the molecular chains are partially cross-linked to quickly set the shape, and then the moisture curing reaction is used to further cross-link the molecular chains into linear or bulky macromolecules to completely cure and obtain the final strength. Light / moisture dual-curing polyurethane adhesives are developed on the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/79C08G18/67
Inventor 林中祥蔡海元林星
Owner NANJING FORESTRY UNIV
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