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CN-122011970-A - Low-temperature quick-sealing high-initial-adhesion box sealing hot melt adhesive and preparation method thereof

CN122011970ACN 122011970 ACN122011970 ACN 122011970ACN-122011970-A

Abstract

The invention relates to the technical field of hot melt adhesives, in particular to a low-temperature quick-sealing high-initial-adhesion box sealing hot melt adhesive and a preparation method thereof. The hot melt adhesive comprises polyolefin elastomer, wax, ethylene-vinyl acetate copolymer, hydrogenated hydrocarbon tackifying resin and special functional tackifying phase particles. The particles are prepared by grafting hydrogenated hydrocarbon tackifying resin with maleic anhydride and then sequentially reacting with polyethylene glycol methyl ether amine, polyether monoamine and octadecylamine. The structure can obviously reduce the interfacial tension of the colloid on the surface of the low-temperature paperboard, realize quick spreading and permeation, and simultaneously enhance cohesive strength and flexibility, thereby obtaining excellent quick sealing performance and high initial adhesion at low temperature.

Inventors

  • LIU MING
  • JIANG FUXIAN
  • CHEN XIAO

Assignees

  • 四川优力赛新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The low-temperature quick-sealing high-initial-adhesion sealing case hot melt adhesive is characterized by comprising 600-650 parts of polyolefin elastomer, 180-200 parts of Fischer-Tropsch wax, 90-100 parts of microcrystalline wax, 200-220 parts of ethylene-vinyl acetate copolymer, 300-400 parts of hydrogenated hydrocarbon tackifying resin and 492-552 parts of functional tackifying phase particles, wherein the functional tackifying phase particles are obtained by grafting and modifying the hydrogenated hydrocarbon tackifying resin by maleic anhydride and then sequentially reacting with polyethylene glycol methyl ether amine, polyether monoamine and octadecylamine; The functional tackifying phase particles are prepared from 1000 parts of hydrogenated hydrocarbon tackifying resin, 20-30 parts of maleic anhydride, 1.5-2.5 parts of organic peroxide initiator, 60-100 parts of polyethylene glycol methyl ether amine, 40-80 parts of polyether monoamine and 15-25 parts of octadecylamine according to parts by weight.
  2. 2. The low temperature quick seal high initial adhesion seal case hot melt adhesive of claim 1, further comprising 8 parts of antioxidant 1010.
  3. 3. The low temperature quick seal high initial adhesion seal box hot melt adhesive of claim 1, wherein the organic peroxide initiator is 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane.
  4. 4. The low temperature quick seal high initial adhesion seal case hot melt adhesive according to claim 1, wherein the polyolefin elastomer has an ethylene content of 11wt% to 13wt%, a melting point of 90 to 110 ℃, and a glass transition temperature of-31±2 ℃.
  5. 5. The low temperature quick seal high initial adhesion seal case hot melt adhesive of claim 1, wherein the hydrogenated hydrocarbon tackifying resin is a fully hydrogenated hydrocarbon resin having a ring and ball softening point of 90-110 ℃.
  6. 6. The low temperature quick seal high initial adhesion seal case hot melt adhesive of claim 1, wherein the ethylene-vinyl acetate copolymer has a vinyl acetate content of 27wt% to 29wt%, and a melt index of 380 to 420g/10min at 190 ℃ per 2.16 kg.
  7. 7. The low-temperature quick-sealing high-initial-adhesion sealing box hot melt adhesive according to claim 1, wherein the polyethylene glycol methyl ether amine is Sigma-Aldrich brand, product number 767565, and the polyether monoamine is from Huntsman corporation, model JEFFAMINE M-2005.
  8. 8. The low temperature quick-sealing high-initial-adhesion box sealing hot melt adhesive according to claim 1, wherein the preparation steps of the functional tackifying phase particles are as follows: (1) Heating and melting hydrogenated hydrocarbon tackifying resin under the protection of nitrogen, adding maleic anhydride, and performing grafting reaction under the action of an organic peroxide initiator to obtain maleic anhydride grafting modified hydrogenated hydrocarbon tackifying resin melt; (2) Removing the volatilization of the melt obtained in the step (1), cooling, and sequentially adding polyethylene glycol methyl ether amine, polyether monoamine and octadecylamine for reaction to obtain a functional tackifying phase melt; (3) And (3) devolatilizing the functional tackifying phase melt obtained in the step (2), cooling, crushing and granulating to obtain the functional tackifying phase particles.
  9. 9. A method for preparing the low-temperature quick-sealing high-initial-adhesion hot melt adhesive for sealing cases according to any one of claims 1 to 8, which is characterized by comprising the steps of melting and mixing a polyolefin elastomer, fischer-Tropsch wax and microcrystalline wax, adding an ethylene-vinyl acetate copolymer, mixing, adding a hydrogenated hydrocarbon tackifying resin, mixing, adding functional tackifying phase particles, mixing to obtain a molten colloid, and cooling and molding to obtain the low-temperature quick-sealing high-initial-adhesion hot melt adhesive for sealing cases.
  10. 10. The method for preparing a low-temperature quick-sealing high-initial-adhesion seal case hot melt adhesive according to claim 9, wherein the polyolefin elastomer, the Fischer-Tropsch wax and the microcrystalline wax are heated to 150 ℃ and stirred at 60rpm for 30min, the ethylene-vinyl acetate copolymer is added at 150 ℃ for 3 times and mixed at 10min intervals, then heated to 160 ℃ and stirred for 40min, the hydrogenated hydrocarbon tackifying resin is added and stirred for 30min, the system is cooled to 150 ℃, the functional tackifying phase particles are added at 150 ℃ for 4 times and mixed at 8min intervals, stirring is continued for 40min, the antioxidant 1010 is added and stirred for 10min after cooling to 140 ℃, and finally the mixture is filtered through a 120-mesh stainless steel filter screen while hot, and casting, cooling and molding are performed.

Description

Low-temperature quick-sealing high-initial-adhesion box sealing hot melt adhesive and preparation method thereof Technical Field The invention relates to the technical field of hot melt adhesives, in particular to a low-temperature quick-sealing high-initial-adhesion box sealing hot melt adhesive and a preparation method thereof. Background The sealing hot melt adhesive is widely applied to the field of logistics packaging, and the performance of the sealing hot melt adhesive directly influences the sealing efficiency and the packaging safety. The conventional hot melt adhesive uses ethylene-vinyl acetate copolymer, tackifying resin and wax as main components, and can form adhesion by melt flow, infiltration of the adhered surface and cooling solidification under normal temperature environment. However, when the application environment temperature is reduced to a low temperature range of 5-15 ℃, the performance shortboard of the adhesive is exposed. First, the melt viscosity of the hot melt adhesive is remarkably increased due to the low temperature, and the fluidity of the adhesive is deteriorated. On a high-speed automatic box sealing line, after the glue solution is extruded from a coating head, the glue solution is difficult to sufficiently level and infiltrate into the rough and porous fiber surface of the corrugated board in a set extremely short time. The insufficient wetting directly results in a substantial reduction in the actual contact area between the glue layer and the board, with weak interfacial forces. The paper board cover plate is easy to lift or rebound under the internal tension or external slight collision after the case is sealed, namely the phenomenon of cold opening, and the paper board cover plate is separated even immediately after pressing in severe cases, so that the production line is stopped and the packaging fails. Secondly, in order to solve the problem of insufficient initial adhesion at low temperature, a common countermeasure is to raise the sizing temperature of the hot melt adhesive so as to reduce the colloid viscosity through higher heat energy and improve the fluidity. The method has the obvious disadvantages that on one hand, the continuous high-temperature operation obviously increases the energy consumption, and on the other hand, the excessive temperature easily causes the thermal oxidation or thermal degradation of part of heat sensitive components (such as certain tackifying resins or polymers) of the hot melt adhesive, which is manifested by darkening colloid color, generating coking particles and forming wiredrawing, not only blocking the nozzle of the precise gluing equipment to influence the glue outlet uniformity, but also introducing impurity points to impair the bonding appearance and reliability. In addition, there are also attempts to enhance the interaction of colloids with paper fibers by introducing highly polar components. However, simply increasing the polarity of the system is often accompanied by new problems of decreased cohesive strength or poor compatibility. The hot melt adhesive with too high polarity may become brittle after cooling, and may easily crack or even break when subjected to bending or impact in a low temperature environment, i.e., the flexibility is deteriorated. The brittleness not only affects the stacking compression resistance of the box body after box sealing, but also can cause early damage of the bonding interface under stress. Therefore, how to simultaneously realize instant rapid infiltration of the colloid to the paper substrate and subsequent continuous and reliable cohesive strengthening under the low-temperature condition, and maintain excellent processing stability and material durability becomes a technical bottleneck to be broken through in the field. Disclosure of Invention In view of the above, the invention aims to provide a low-temperature quick-sealing high-initial-adhesion sealing hot melt adhesive and a preparation method thereof, so as to solve the problems that the existing sealing hot melt adhesive has serious defects of wetting and spreading of corrugated paper fibers caused by rapid rise of melt viscosity in a low-temperature environment, cannot establish effective initial adhesion in a very short time, frequently causes adhesion failure, and increases energy consumption and cokes materials caused by rising of sizing temperature for compensating strength. Based on the purposes, the invention provides a low-temperature quick-sealing high-initial-adhesion sealing box hot melt adhesive which comprises, by mass, 600-650 parts of polyolefin elastomer, 180-200 parts of Fischer-Tropsch wax, 90-100 parts of microcrystalline wax, 200-220 parts of ethylene-vinyl acetate copolymer, 300-400 parts of hydrogenated hydrocarbon tackifying resin and 492-552 parts of functional tackifying phase particles, wherein the functional tackifying phase particles are obtained by grafting and modifying the hydrogenated hydrocar