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CN-121975478-A - Anti-bulge hot melt adhesive for wall surface and preparation method thereof

CN121975478ACN 121975478 ACN121975478 ACN 121975478ACN-121975478-A

Abstract

The invention relates to the technical field of hot melt adhesives and discloses an anti-swelling hot melt adhesive for a wall surface and a preparation method thereof, wherein the hot melt adhesive comprises the following raw materials, by weight, 100 parts of polyester polyol, 20-25 parts of diisocyanate, 10-15 parts of functional chain extender, 1-5 parts of functional nano titanium dioxide and 0.05-0.1 part of dibutyltin dilaurate. The functionalized nano titanium dioxide improves the anti-swelling performance of the hot melt adhesive by solving the problem that the base layer and the decorative material are different due to different thermal expansion coefficients.

Inventors

  • WU BENXIAN
  • Qiao Jipeng

Assignees

  • 杭州邦林粘合科技有限公司

Dates

Publication Date
20260505
Application Date
20260312

Claims (9)

  1. 1. The anti-swelling hot melt adhesive for the wall surface is characterized by comprising the following raw materials, by weight, 100 parts of polyester polyol, 20-25 parts of diisocyanate, 10-15 parts of functional chain extender, 1-5 parts of functional nano titanium dioxide and 0.05-0.1 part of dibutyltin dilaurate; the preparation method of the hot melt adhesive comprises the following steps: Dispersing nano titanium dioxide in an ethanol water solution with the mass fraction of 65%, stirring and dispersing, adding cyano siloxane into the solution, controlling the temperature to be 70-80 ℃, reacting for 6-8 hours in a nitrogen atmosphere, filtering after the reaction is finished, washing the solution sequentially by using ethanol and deionized water, and drying to obtain the functionalized nano titanium dioxide; And (2) adding the dried polyester polyol into a round-bottom flask, adding diisocyanate and dibutyltin dilaurate into the round-bottom flask, controlling the temperature to be 120 ℃, reacting for 30-40min, cooling to 100 ℃, adding a functional chain extender into the round-bottom flask, continuously maintaining the reaction for 30-40min, finally adding functional nano titanium dioxide into the round-bottom flask, heating to 110 ℃, reacting for 1-2h, and discharging to obtain the anti-swelling hot melt adhesive for the wall surface.
  2. 2. The anti-swelling hot melt adhesive for wall surfaces according to claim 1, wherein the polyester polyol is one or a mixture of two of a polyester polyol PBA and a polyester polyol PPG.
  3. 3. The anti-swelling hot melt adhesive for wall surfaces according to claim 1, wherein the diisocyanate is one or a mixture of two of diphenylmethane diisocyanate and isophorone diisocyanate.
  4. 4. The bulge-preventing hot melt adhesive for wall surfaces according to claim 1, wherein the usage amount of the cyanated siloxane is 5-10% of the mass of the nano titanium dioxide.
  5. 5. The anti-swelling hot melt adhesive for wall surfaces according to claim 1, wherein the preparation method of the functional chain extender comprises the following steps: A1, dispersing triallyl isocyanurate, 4-amino thiophenol and azodiisobutyronitrile into ethanol, controlling the temperature to be 60-65 ℃, reacting for 8-10 hours, and after the reaction is finished, performing rotary evaporation and drying to obtain an intermediate; A2, adding an intermediate and gamma-glycidol ether oxypropyl trimethoxy silane into a tetrahydrofuran solvent under the protection of nitrogen, controlling the temperature to be 50-60 ℃, reacting for 36-40h, extracting with acetone after the reaction is finished, and drying to obtain the functional chain extender.
  6. 6. The anti-swelling hot melt adhesive for wall surfaces according to claim 5, wherein in the A1, the molar ratio of triallyl isocyanurate, 4-aminophenol and azobisisobutyronitrile is 1:3.2-3.5:0.15-0.18.
  7. 7. The anti-swelling hot melt adhesive for wall surfaces according to claim 5, wherein in the A2, the molar ratio of the intermediate to the gamma-glycidoxypropyl trimethoxysilane is 1:3.5-4.
  8. 8. The anti-swelling hot melt adhesive for wall surfaces according to claim 1, wherein the preparation method of the cyanated siloxane comprises the following steps: adding 4-hydroxybenzonitrile, aminopropyl triethoxysilane and formaldehyde into 1, 4-dioxane, stirring for dispersion, controlling the temperature to be 80-90 ℃, reacting for 8-10 hours, and after the reaction is finished, performing rotary evaporation and drying to obtain the cyano siloxane.
  9. 9. The anti-swelling hot melt adhesive for wall surfaces according to claim 8, wherein the molar ratio of the 4-hydroxybenzonitrile to the aminopropyl triethoxysilane to the formaldehyde is 1:1-1.2:2.2-2.4.

Description

Anti-bulge hot melt adhesive for wall surface and preparation method thereof Technical Field The invention relates to the technical field of hot melt adhesives, in particular to an anti-bulge hot melt adhesive for a wall surface and a preparation method thereof. Background The wall surface decorative material (such as a decorative plate, a wallboard and the like) is easy to bulge, hollowing, fall off and the like in the long-term use process, and the phenomenon not only seriously affects the attractive effect of the wall surface, but also is more likely to cause potential safety hazards. The reason for causing the wall surface bulge is more complex and mainly comprises the following aspects that (1) the wall surface can undergo obvious temperature change (such as day and night temperature difference, season alternation, direct sunlight and the like) in daily environment, so that the wall body base layer and the decoration material generate different deformation due to different thermal expansion coefficients, if the heat resistance of the hot melt adhesive is insufficient, the base layer wall body and the decoration material have different thermal expansion coefficients due to different materials, the deformation of the colloid and the base material is uncoordinated, the stress is concentrated at the weak position, and the bulge and the cracking are finally caused. (2) The wall surface base layer (concrete, putty, old coating and the like) is porous, coarse and possibly contains residual moisture, the adhesive is required to have strong penetrating and anchoring capabilities, and if the capabilities are poor, the problem of bulge and even falling off can occur. (3) The wall base layer has inherent defects such as microcracks, shrinkage and expansion, and the adhesive with insufficient toughness can cause stress concentration due to brittle fracture, and the high-toughness adhesive layer can absorb deformation energy of the base layer through elastic deformation, so that cracks are avoided. In recent years, the nano material modification technology provides a new direction for developing high-performance hot melt adhesive, nano titanium dioxide is a multifunctional inorganic nano particle, but if the nano titanium dioxide is not subjected to organic modification, the compatibility with the hot melt adhesive is poor, and the comprehensive performance of the hot melt adhesive is seriously affected. Disclosure of Invention The invention aims to overcome one or more defects in the prior art and provides an anti-swelling hot melt adhesive for a wall surface and a preparation method thereof. In order to achieve the above purpose, the invention adopts a technical scheme that: The anti-swelling hot melt adhesive for the wall surface comprises the following raw materials, by weight, 100 parts of polyester polyol, 20-25 parts of diisocyanate, 10-15 parts of functional chain extender, 1-5 parts of functional nano titanium dioxide and 0.05-0.1 part of dibutyltin dilaurate; the preparation method of the hot melt adhesive comprises the following steps: Dispersing nano titanium dioxide in 65% ethanol water solution by mass fraction, stirring and dispersing, adding cyanated siloxane into the mixture, controlling the temperature to be 70-80 ℃, reacting for 6-8 hours in nitrogen atmosphere, carrying out suction filtration, washing and drying sequentially by using ethanol and deionized water to obtain the functionalized nano titanium dioxide, carrying out condensation reaction between-Si-OH generated after the hydrolysis of the cyanated siloxane and hydroxyl contained on the surface of the nano titanium dioxide in the reaction to obtain the functionalized nano titanium dioxide, adding the functionalized nano titanium dioxide into a hot melt adhesive, increasing the compatibility of the nano titanium dioxide and an organic material, uniformly dispersing the nano titanium dioxide in the material, effectively inducing silver lines and shear strips when the nano titanium dioxide is subjected to external force, absorbing impact energy, preventing crack expansion, enabling the hot melt adhesive to be well adapted to deformation of a base layer, relieving stress concentration, and on the other hand, enabling surface groups of the functionalized nano titanium dioxide to form chemical bonding with inorganic components in the wall surface, remarkably improving interface bonding strength, and simultaneously, improving the wettability of the nano particles to the hot melt adhesive and the mechanical embedding resistance of the porous base layer. And (2) adding the dried polyester polyol into a round-bottom flask, adding diisocyanate and dibutyltin dilaurate into the round-bottom flask, controlling the temperature to be 120 ℃, reacting for 30-40min, cooling to 100 ℃, adding a functional chain extender into the round-bottom flask, continuously maintaining the reaction for 30-40min, finally adding functional nano titanium dioxide into the ro