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Polyurethane hot-melt adhesive containing dynamic oxime-urethane bond and preparation method thereof

A polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve not many problems, achieve high initial bond strength and final bond strength, and maximize practical Significance, the effect of fast curing speed

Active Publication Date: 2019-06-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the previous reports on materials prepared based on dynamic bonds only focused on the self-healing and reprocessing capabilities of materials, and there are not many reports on adhesives containing dynamic bonds.

Method used

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  • Polyurethane hot-melt adhesive containing dynamic oxime-urethane bond and preparation method thereof
  • Polyurethane hot-melt adhesive containing dynamic oxime-urethane bond and preparation method thereof
  • Polyurethane hot-melt adhesive containing dynamic oxime-urethane bond and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Experimental raw materials

[0029] Polytetrahydrofuran diol (PTMG, Mn=~1000g mol -1 , Aladdin), diphenylmethane diisocyanate (MDI, 99%, Aladdin) and dibutyltin dilaurate (DBTDL, 95%, Aladdin); dimethylglyoxime (DMG, 98%, Sinopharm) and glycerol Alcohol (99%, Sinopharm Group). Acetone (99.8%, Yongcheng Chemical).

[0030] (2) Preparation method

[0031] First, the above raw materials are taken according to the proposed molar ratio, such as polytetrahydrofuran glycol (PTMG, 0.575g, 1 mole fraction), dimethylglyoxime (DMG, 0.200g, 3 mole fractions), glycerin (GLY, 0.026g, 0.5 mole fraction) was dissolved in 5ml of acetone; after dimethylglyoxime was completely dissolved and a colorless transparent liquid was formed, diphenylmethane diisocyanate (MDI, 0.682g, 4.75 mole fraction ) and dibutyltin dilaurate (DBTDL, 0.015g, 1wt%); after mixing evenly, transfer the liquid mixture to a PTFE mold, and put the PTFE mold containing the liquid mixture into an oven at 50°C fo...

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PUM

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Abstract

The invention relates to a polyurethane hot-melt adhesive containing a dynamic oxime-urethane bond and a preparation method thereof. Polymerization monomers include at least one polyisocyanate, at least one micromolecule oxime, and at least one polyol. According to the invention, a dynamic covalent bond is introduced into a cross-linked polyurethane hot-melt adhesive system, and the introduction of the dynamic bond allows a thermosetting material to have certain thermoplastic properties, resulting in a hot-melt adhesive with the advantages of both thermoplastic polyurethane and reactive polyurethane hot-melt adhesives, which has great practical significance for practical application of the polyurethane adhesive.

Description

technical field [0001] The invention belongs to the field of hot-melt adhesives, in particular to a polyurethane hot-melt adhesive containing oxime urethane dynamic bonds and a preparation method thereof. Background technique [0002] Hot melt adhesive is a kind of solvent-free adhesive, which is solid at room temperature and has no cohesiveness. It can flow after heating and melting, and has a good wetting effect with the surface, and has excellent bonding performance after cooling. . Compared with solvent-based adhesives, hot-melt adhesives (HMAs) are expected to be the next generation of green adhesives because its solvent-free adhesive can avoid the emission of volatile organic compounds (VOCs). The performance of polyurethane is very adjustable, and polyurethane hot melt adhesive is an important type of hot melt adhesive. Existing hot-melt polyurethane adhesives are mainly divided into two categories, one is thermoplastic polyurethane (TPU) adhesives, which can flow w...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/32C08G18/38
Inventor 游正伟王署亮
Owner DONGHUA UNIV
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