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How to choose environmentally friendly hot melt adhesive? At present, the functions and applications of hot melt adhesive have received widespread attention, but the environmental issues of hot melt adhesive are often overlooked. Has environmental protection become a bottleneck for the further development of adhesives? Solving the problem of environmental pollution has become an urgent task nowadays.
Hot melt adhesive is mainly made of EVA, rubber, polyolefin, polyamide and other materials, supplemented by high molecular weight materials such as tackifiers and softeners. Solvent free and non-volatile. Compared to solvent based, oil-based, and water-based adhesives, hot melt adhesive is more environmentally friendly.
However, the layers in environmentally friendly hot melt adhesive are different. From the environmental requirements of the European Union and the United States, many hot melt adhesives currently on the market do not meet the standards. Many hot melt adhesive companies, in order to reduce costs, extensively use environmentally unfriendly and inexpensive materials, and classify their produced hot melt adhesives as non environmentally friendly products.
How can we determine if the hot melt adhesive we purchase is environmentally friendly? At present, international environmental protection hot melt adhesive testing projects include ROSH standards, formaldehyde testing, determination of 18 types of polycyclic aromatic hydrocarbons, halogen fluorine, chlorine, bromine, iodine content, determination of total octane yellow compounds (PFOS) content, determination of nonylphenol formaldehyde polyvinyl chloride ether (NDEOS) content, and REACH84 testing. Medical hot melt adhesive also undergoes skin insensitivity testing.
The feasibility of reheating and reworking hot melt adhesive after solidification depends on the degree of degradation of the adhesive performance after the secondary heating. This article explains the typical changes of EVA hot melt adhesive after multiple heating, the key points of rework operation, and why PUR cannot be reworked.
Hot melt adhesive granules are a type of flexible adhesive. Its physical properties vary with temperature within the necessary temperature range, but its chemical properties remain unchanged. It is non-toxic and odorless, and is an energy-saving chemical product. So what are the factors that affect the bonding effect of hot melt adhesive particles? . Plate […]
Direct answer: A new sample must be made changeHot melt adhesive granulesSuppliers, even if they claim that the parameters are exactly the same and can be directly replaced, must still make new samples on their own equipment and actual substrates. The reason is that two adhesives with the same nominal softening point of 85 ℃ […]
What exactly is’ drawing ‘on the machine At the moment of glue coating or breaking, a thin wire is pulled out from the end of the sealing or gluing line, which is called “drawing” in the industry.Hot melt adhesive granulesAfter melting, it is a high viscosity hot fluid, and once the temperature, flow rate, and […]
