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A kind of preparation method of the water-based adhesive that has mutual understanding to the surface energy of the substrate

A substrate surface, mutual recognition technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc. -Object interaction force and other issues, to achieve wide practicability and improve the effect of interaction force

Active Publication Date: 2021-10-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding fluorine-containing and silicon-containing surfactants or introducing fluorine-containing and silicon-containing segments into polyurethane macromolecules can reduce the surface tension of WPU, adjust the interfacial tension between WPU and the substrate, and solve the problem of wetting and spreading. It cannot improve the interaction force between the host and the object, nor can it fundamentally solve the problems of bonding fastness and peel strength

Method used

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  • A kind of preparation method of the water-based adhesive that has mutual understanding to the surface energy of the substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Put 1 mole of HDI trimer and 1 mole-average molecular weight of 1000 and viscosity of 2000cps monohydroxyl silicone oil into the reactor, and react at 70-80°C for 2 hours to obtain diisocyanate containing silicone side chains;

[0021] (2) 4.0wt% of polybutylene adipate diol, isophorone diisocyanate, hydrophilic chain extender dimethylol propionic acid (solid weight) of molecular weight 2000 is added to reaction vessel, control-NCO / -OH molar ratio 2:1, under continuous stirring and nitrogen atmosphere protection, heat up to 90 ° C for 2 hours to obtain -NCO-terminated polyurethane prepolymer;

[0022] (3) In another reactor, add polypropylene glycol with a molecular weight of 2000, 3.0 wt% of diisocyanate containing organosilicon side chains prepared in step (1) and isophorone diisocyanate to control the -NCO / -OH molar ratio 1:2, under continuous stirring and nitrogen atmosphere protection, heat up to 90°C for 2 hours to form -OH-terminated polyurethane prepolymer;...

Embodiment 2

[0025] (1) Put 1 mole of HDI trimer and 1 mole-average molecular weight of 2000 and viscosity of 4000cps monohydroxyl silicone oil into the reactor, and react at 70-80°C for 2 hours to obtain diisocyanate containing silicone side chains;

[0026] (2) Polycarbonate diol, 4,4'-dicyclohexylmethane diisocyanate H with a number average molecular weight of 10000 12 Add MDI, hydrophilic chain extender dimethylolpropionic acid (solid weight) 4.5wt% to the reaction vessel, control the -NCO / -OH molar ratio of 2:1, and raise the temperature to 80-90°C under continuous stirring and nitrogen atmosphere protection. ℃ for 2 hours to form -NCO-terminated polyurethane prepolymer;

[0027] (3) In another reactor, add polytetrahydrofuran diol with a number average molecular weight of 2000, 5.0 wt% of diisocyanate containing organosilicon side chains prepared in step (1) and toluene diisocyanate to control -NCO / -OH The molar ratio is 1:2, under the protection of continuous stirring and nitrogen ...

Embodiment 3

[0030] (1) Put 1 mole of HDI trimer and 1 mole-average molecular weight of 1000 and viscosity of 3000cps monohydroxyl silicone oil into the reactor, and react at 70-80°C for 2 hours to obtain diisocyanate containing silicone side chains;

[0031] (2) Polycaprolactone diol with a number average molecular weight of 4000, hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, hydrophilic chain extender dimethylol propionic acid (solid weight) Add 5.0 wt% into the reaction vessel, control the molar ratio of -NCO / -OH to 2:1, and raise the temperature to 80-90°C for 2.5 hours under the protection of continuous stirring and nitrogen atmosphere to form -NCO-terminated polyurethane prepolymer;

[0032] (3) In another reactor, add 100 parts of dihydroxy polybutadiene diol with a number average molecular weight of 10,000, 4.0 wt% of diisocyanate containing organosilicon side chains prepared in step (1) and hexamethylene diisocyanate , control the -NCO / -OH molar ratio of 1:2, un...

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Abstract

The invention relates to a preparation method of a water-based adhesive having mutual understanding of the surface energy of a base material, which is mainly used for bonding synthetic leather and shoe materials with low surface energy and large differences in the base material surface energy. The present invention adopts dibasic alcohol similar in structure to the non-polar base material as the soft segment of WPU, through directional construction technology during synthesis, and introduces organic silicon side chains, the directional arrangement of organic silicon side chains can regulate the surface tension of WPU at 20- Between 35mN / m, due to the directional construction, the enriched polar segment in the WPU macromolecular chain has mutual recognition to the polar substrate, and the enriched non-polar segment has mutual recognition to the non-polar substrate. The interaction force between the WPU macromolecule and the substrate has been greatly improved, and the prepared adhesive is safe and environmentally friendly, and it shows a peel strength of ≥ 50N / 3cm to TPO, TPU, silicone, PVC and other substrates with different surface energies. The ability has greatly improved the wide practicability of WPU adhesives.

Description

technical field [0001] The invention specifically relates to a preparation method of a water-based adhesive capable of self-knowledge on the surface energy of a substrate, and belongs to the field of environmentally friendly adhesives. Background technique [0002] With the increasingly stringent requirements of environmental protection regulations, traditional solvent-based adhesives are gradually being replaced by water-based adhesives. There are more and more researches on the development and application of water-based environmentally friendly adhesives, and the market demand potential is huge. Water-based polyurethane uses water as the dispersion medium. It has the advantages of non-toxic, non-flammable, safe and environmentally friendly, and has both the structural characteristics and excellent performance of polyurethane materials. It is widely used in coatings, synthetic leather, adhesives and other fields. Water-based polyurethane adhesives have many advantages such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C08G18/77C08G18/79
CPCC08G18/778C08G18/792C09J175/04
Inventor 范浩军陈意石碧向均颜俊王丽
Owner SICHUAN UNIV
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