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People have always been confused about the softening point and temperature resistance of hot melt adhesive. Some customers even asked what the melting point of hot melt adhesive is? Now Senlai hot melt adhesive will answer from a professional perspective, with a detailed understanding of the differences in melting point, softening point, and temperature resistance.
Melting point: The melting point of a substance, which is the temperature at which a solid or liquid of a pure substance reaches equilibrium under a certain pressure. Due to the fact that hot melt adhesive is a mixed substance, it is incorrect to define hot melt adhesive based on its melting point. The melting point that most customers refer to is actually the softening point of hot melt adhesive.
Softening point: Softening point, the temperature at which a substance softens. Mainly refers to the temperature at which amorphous polymers begin to soften. It is not only related to the structure of the polymer, but also to its molecular weight. There are many measurement methods. Different measurement methods often result in inconsistent results. The softening point of hot melt adhesive is usually tested using the global method, with a softening point between 69-82 ℃.
Temperature resistance: It is an important technical indicator of hot melt adhesive. It refers to the temperature at which the adhesive properties of hot melt adhesive begin to change after it is firmly bonded. Ordinary EVA hot melt adhesive is suitable for ambient temperatures ranging from 0 to 35 ℃. Special models of hot melt adhesive can withstand high temperatures of 80 ℃, 120 ℃, 140 ℃, and 170 ℃. The low temperature resistance is generally -10 ℃, and some hot melt adhesives can reach -20~-30 ℃. Ordinary hot melt adhesive can meet the normal climate range.
How to distinguish the quality of book binding glue? The hot melt adhesive used in books is divided into backing adhesive and edge sealing adhesive According to the thickness of different materials of paper and books, book adhesives with different viscosities and flow effects can be used to complete the bonding work of book pages. […]
The weather resistance of hot melt adhesive affects its application effect. Hot melt adhesive manufacturers need to adjust the heat resistance of hot melt adhesive according to different application environments to achieve ideal application performance. The heat resistance of hot melt adhesive is closely related to its softening point. Hot melt adhesives with good heat […]
Why do hot melt adhesive particles emit a lot of smoke during the heating process? When using hot melt adhesive, its viscosity can only be affected by heating. The hot melt adhesive equipment used in industry cannot do without a heating system. Sometimes, there may be a large amount of abnormal smoking during the heating […]
What is the reason why EVA hot melt adhesive does not stick? Some time ago, a customer asked us why we couldn’t stick books firmly when bonding. Through this small case, we will answer the question: What is the reason why hot melt adhesive does not stick? When bonding books, if EVA hot melt adhesive […]
