In our lives, whether it is artistic creation, handiwork, or simple filling, the hot melt glue gun is always a good tool, and the matching with the glue gun is of course the fully transparent elastic hot melt glue stick. But...... Do you really know about transparent stretch hot melt sticks? The primary raw material of the fully transparent elastic hot melt glue stick is made of EVA ethylene and other auxiliary materials at high temperatures, that is, the so-called resin. EVA resin is the most important material for making fully transparent elastic hot melt glue sticks, and the amount used accounts for about 55%.
The root characteristics of fully transparent elastic hot melt adhesive sticks depend on the quality and amount of EVA resin, such as the adhesive strength, melting point and the selection of auxiliary materials used for fully transparent elastic hot melt adhesive sticks. Therefore, for the fully transparent elastic hot melt glue stick used for furniture or handicraft bonding, the fully transparent elastic hot melt glue stick with a certain flexibility, elasticity, adhesion and small deformation is probably selected for use with EVA resin. Fully transparent elastic hot melt adhesive stick is a solid adhesive made of ethylene-vinyl acetate copolymer (EVA) as the main material, adding tackifier and other components. With fast bonding, high strength, aging resistance, non-toxicity, good thermal stability, it can be used for wood, plastics, fibers, fabrics, metals, furniture, lampshades, leather, handicrafts, electronic toys, electrical components, paper products, ceramics, pearl cotton packaging and other mutual adhesive solids, which can be widely used in factories and families.
The demand for fully transparent elastic hot melt glue sticks is constantly being innovated and developed. The existing fully transparent elastic hot melt glue stick should be modified, and the existing fully transparent elastic hot melt glue stick should be modified by mixing, chemical reaction and other methods to improve the characteristics of the fully transparent elastic hot melt glue stick. For example, stabilizers to prevent oxidation, tackifiers to enhance adhesion, white wax to reduce adhesion to transform the appearance characteristics, various materials to improve adhesion, softening point and bond strength, etc. Explore the quality and share of various auxiliary materials, and improve the formula to meet different needs.
So how to judge the quality of fully transparent elastic hot melt glue sticks?
Let's start with hot melt adhesive, hot melt adhesive is a kind of polymer compound, and the quality indicators of fully transparent elastic hot melt glue rods mainly include: peel strength index, melt viscosity index, softening point index, viscosity index and appearance index. Some indicators need to be tested with professional instruments, some indicators need to be tested in an appropriate environment, and the second is to melt the fully transparent elastic hot melt glue stick to make a tape with a width of about 1CM and a thickness of 0.2CM. After cooling, stretch the tape by hand to visually check whether the elongation rate of the hot melt adhesive can meet the standard. Whether the tensile strength is strong enough, and whether the fracture of the hot melt adhesive can maintain the same color. If there is a powdery substance at the fracture of the fully transparent elastic hot melt glue stick, it means that there is too much filler or uneven mixing in the process of producing hot melt adhesive, or because the filler particles are too large, which will cause the quality of hot melt adhesive to deteriorate.
The temperature resistance test of hot melt adhesive is to place the fully transparent elastic hot melt glue stick or rubber particles in the environment of 0 °C, keep it for 24 hours and then take it out, and beat it with a hard object If the hot melt adhesive is brittle, it indicates that the full transparent elastic hot melt glue stick has poor low temperature resistance. After placing the hot melt adhesive in a temperature environment of 40°C for a certain period of time, if the hot melt adhesive is soft, self-adhesive or sticky, it indicates that the softening point of the glue is low.
