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CN-116836669-B - Hot melt adhesive and preparation method and application thereof

CN116836669BCN 116836669 BCN116836669 BCN 116836669BCN-116836669-B

Abstract

The invention provides a hot melt adhesive, a preparation method and application thereof, the preparation raw materials of the hot melt adhesive comprise hyperbranched polyether copolymer and polyphenol compounds. The hot melt adhesive is prepared by mixing the hyperbranched polyether copolymer and the polyphenol compound and then heating, has a simple preparation process, and has excellent adhesive strength, good reusability and water resistance on various different base materials.

Inventors

  • WANG LIGUO
  • ZENG XIANQIANG
  • LI HUIQUAN
  • CAO YAN
  • HE PENG

Assignees

  • 中国科学院过程工程研究所

Dates

Publication Date
20260505
Application Date
20230619

Claims (20)

  1. 1. The hot melt adhesive is characterized in that the preparation raw materials of the hot melt adhesive comprise hyperbranched polyether copolymer and polyphenol compounds; the hyperbranched polyether copolymer is prepared from raw materials including glycidol and optional alkylene oxide; the hyperbranched polyether copolymer is prepared by mixing glycidol, alkylene oxide, a catalyst and a solvent, and reacting to obtain the hyperbranched polyether copolymer.
  2. 2. The hot melt adhesive of claim 1, wherein the mass ratio of the hyperbranched polyether copolymer to the polyphenol is 1-10:5.
  3. 3. The hot melt adhesive according to claim 1 or 2, wherein the alkylene oxide comprises any one or a combination of at least two of propylene oxide, butylene oxide, pentane oxide or hexane oxide.
  4. 4. The hot melt adhesive according to claim 1, wherein the molar ratio of glycidol to alkylene oxide is 25:0-50.
  5. 5. The hot melt adhesive according to claim 1, wherein the molar ratio of glycidol to alkylene oxide is 25:2.5-35.
  6. 6. The hot melt adhesive according to claim 1, wherein the number average molecular weight of the hyperbranched polyether copolymer is 500-20000 g/mol.
  7. 7. The hot melt adhesive of claim 1, wherein the catalyst comprises a lewis acid catalyst.
  8. 8. The hot melt adhesive of claim 7, wherein the lewis acid catalyst comprises scandium triflate.
  9. 9. The hot melt adhesive of claim 1, wherein the solvent comprises any one or a combination of at least two of methylene chloride, chloroform, or acetonitrile.
  10. 10. The hot melt adhesive according to claim 1, wherein the reaction is carried out under inert gas protection.
  11. 11. The hot melt adhesive of claim 1, wherein the reaction temperature is room temperature and the reaction time is 5-10 h.
  12. 12. The hot melt adhesive of claim 1, wherein the post-reaction further comprises quenching with a quencher and removing impurities.
  13. 13. The hot melt adhesive of claim 12, wherein the quenching agent comprises any one or a combination of at least two of water, methanol, or ethanol.
  14. 14. The hot melt adhesive of claim 12, wherein the removing of impurities comprises filtration, distillation under reduced pressure, precipitation, and drying.
  15. 15. The hot melt adhesive of claim 14, wherein the precipitation is a precipitant-added precipitation.
  16. 16. The hot melt adhesive of claim 15, wherein the precipitant comprises a mixture of methanol and n-hexane.
  17. 17. The hot melt adhesive of claim 16, wherein the mass ratio of methanol to n-hexane is 1:10-50.
  18. 18. The hot melt adhesive of claim 14, wherein the drying is vacuum drying.
  19. 19. The hot melt adhesive according to claim 1, wherein the polyphenol compound is a compound having the following structure; wherein each R 1 is independently selected from H or OH, and at least two are OH, R 2 is selected from amino, hydroxy, carboxyl, hydrogen, halogen or C1-C60 organic group.
  20. 20. The hot melt adhesive of claim 19, wherein the C1-C60 organic group is a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C3-C60 cycloalkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C5-C60 aryl group, a substituted or unsubstituted C5-C60 heteroaryl group, and wherein the substituent, when substituted, is selected from the group consisting of halogen, cyano, ester, carbonyl, hydroxyl, aldehyde, carboxyl, ether linkage, amino, nitro, sulfonyl, sulfonic acid, isocyanate, and silicon-containing groups.

Description

Hot melt adhesive and preparation method and application thereof Technical Field The invention belongs to the technical field of adhesive materials, and particularly relates to a hot melt adhesive and a preparation method and application thereof. Background Hot melt adhesives are an important class of adhesive materials that are widely used in our daily life and industry, such as automobiles, electronic materials, packaging materials, and the like. The hot melt adhesive achieves a very high adhesion strength in a short time after cooling, which makes it suitable for complex application scenarios. In addition, the hot melt adhesive has the advantages of good adhesion with various base materials, no solvent, no toxicity, simple operation and the like. Supermolecule hot melt adhesives are based on the non-covalent interactions of small molecules or polymers to form crosslinks, have high adhesive strength and multiple reusability, which make them very attractive adhesive materials, wherein polyphenols with mussels as inspiration are widely used for the preparation of supermolecule hot melt adhesives, catechol groups on the polyphenols can self-assemble with small molecules or polymers to form supermolecule polymers, and adhere to the surfaces of inorganic materials through non-covalent interactions such as metal coordination bonds, hydrogen bonds or pi-pi stacking. CN113308207A discloses a water-proof TPU hot melt adhesive film and a preparation method thereof, wherein the water-proof TPU hot melt adhesive film comprises, by weight, 40-60 parts of polyether polyol, 30-50 parts of isocyanate, 10-15 parts of chain extender, 1-10 parts of organic fluorine waterproof agent, 1-3 parts of cross-linking agent and 6-10 parts of natural polyphenol. The TPU hot melt adhesive film prepared by the technical scheme has excellent water splashing prevention performance, but the adhesive strength of the TPU hot melt adhesive film is required to be further improved, and the TPU hot melt adhesive film does not have recyclability. CN114250053a discloses a method for preparing and using a polyphenol-polyethylene glycol based eutectic adhesive, which is formed by interaction of polyphenol and polyethylene glycol or polyethylene glycol derivatives through hydrogen bonds. The polyphenol-polyethylene glycol based eutectic adhesive provided by the technical scheme has high adhesive strength, can still keep good adhesive performance in a liquid nitrogen atmosphere (-80 ℃), but has no great improvement on water resistance, and if the adhesive is exposed in a moist or humid environment for a long time, the adhesive strength is reduced due to weakening of non-covalent interaction between composite materials. Therefore, there is a need to develop a hot melt adhesive having high adhesive strength and good water resistance. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a hot melt adhesive, a preparation method and application thereof, wherein the hot melt adhesive is prepared from hyperbranched polyether copolymer and polyphenol compound and has the characteristics of high bonding strength and good water resistance. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the invention provides a hot melt adhesive, wherein the hot melt adhesive is prepared from hyperbranched polyether copolymer and polyphenol compound. The hyperbranched polyether copolymer has a highly flexible polyether skeleton and good biocompatibility, and in addition, the hyperbranched polyether copolymer has a unique three-dimensional structure and a plurality of functional hydroxyl groups, the polyphenol compound can be complexed or crosslinked with a polymer chain under non-covalent action and covalent bond, and the supermolecular polymer formed by self-assembly of the hyperbranched polyether copolymer and the polyphenol compound has high bonding strength and good water resistance. Preferably, the mass ratio of the hyperbranched polyether copolymer to the polyphenol is from 1 to 10:5, e.g., 1:5, 2:5, 3:5, 4:5, 5:5, 6:5, 7:5, 8:5, 9:5, or 10:5, etc. Preferably, the hyperbranched polyether copolymer is prepared from a starting material comprising glycidol and optionally an alkylene oxide. In the invention, when the preparation raw materials of the hyperbranched polyether copolymer comprise glycidol and alkylene oxide, a hydrophobic unit is introduced into the polyether main chain of the hyperbranched polyether copolymer, the ether unit in the prepared hyperbranched polyether copolymer is used as a hydrogen bond acceptor, the alkane of a side chain is used as a hydrophobic structure, and the self-assembly of the polyether main chain and the polyphenol compound forms the hot melt adhesive, so that the bonding strength and the water resistance are improved. Preferably, the alkylene oxide comprises any one or a combination of at least two of propylene oxide, butylene