Glued heat shrink tubing refers to a heat shrink tubing with a sealing and waterproof glue layer on the inner wall. The outer layer material has the advantages of insulation, anti-corrosion, and wear resistance, and the inner layer has the advantages of low melting point, waterproof, sealing, and high adhesion. What kind of glue is used for adhesive heat shrink tubing? First of all, let me tell you clearly: the adhesive-coated heat shrinkable tube uses hot melt adhesive, and the physical state changes with the change of temperature. It is solid at room temperature and is easy to package, transport and store. It is an environmentally friendly and non-toxic adhesive.

    Hot melt adhesive is a solid meltable polymer that does not require a solvent and does not contain 100% moisture; it is a solid at room temperature, and when heated and melted to a certain temperature, it becomes a liquid that can flow and has a certain viscosity. Hot melt adhesive consists of basic resin, tackifier, viscosity regulator and antioxidant. It has the characteristics of high bonding strength and fast melting speed.

    Double-walled heat shrinkable tubes generally use transparent hot melt adhesive; medium and thick wall heat shrinkable tubes generally use yellow hot melt adhesive; military standard high flame retardant heat shrinkable tubes also use white hot melt adhesive, which can be flame retardant. performance.

    When producing adhesive heat-shrinkable tubes, the hot-melt adhesive is melted by heating equipment, and evenly adheres to the inner wall of the heat-shrinkable tube through the production equipment. After cooling, the hot-melt adhesive returns to its solid state and permanently adheres to the tube wall. When the hot melt adhesive is heated to shrink the heat shrink tube, the hot melt adhesive melts as the temperature rises, flows with the tube wall, and fills the gaps. The physical state of hot melt adhesive changes with temperature, which is very consistent with the use and characteristics of heat shrink tubes. When heated and shrunk, the temperature increases, and the hot melt adhesive also melts; when the shrinkage is completed, normal temperature returns to normal, and the heat shrink tube cools down. The hot melt adhesive also solidifies as it cools, improving strength and solidifying to enhance the sealing performance of the heat shrink tube.