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2022.06.10
How to distinguish the quality of PUR hot melt adhesive?
I believe everyone is very concerned about how to distinguish the quality of PUR hot melt adhesive. Below, I will teach you from several aspects to identify the quality of PUR hot melt adhesive. 1. You can use the same piece of paper and use different machine speeds to test glue. Through this test method, you can judge the bonding effect and pulling force of this hot melt adhesive. 2. In the same machine, at the same machine speed, use different papers to test the bonding effect and tension of this hot melt adhesive.
2022.06.04
Application of PUR hot melt adhesive
PUR hot melt adhesive due to its excellent performance, products are developed and applied in various fields. (1) When binding books wirelessly, the cured adhesive layer has good flexibility, and the flatness is high when the book is turned over and opened, and the adhesive layer can be prevented from breaking when fully opened, which is better than EVA adhesive bound books;
2022.05.31
What is PUR hot melt adhesive made?
Macromolecular polyol is the soft segment of PU structure, which will directly affect the flexibility and low temperature resistance of PUR hot melt adhesive. Polyester polyols contain a large number of ester groups and have high cohesive energy. The prepared PUR hot melt adhesive has excellent adhesion, good heat resistance and oil resistance, but poor water resistance. Polyether polyols contain a large number of ether linkages and are not easily hydrolyzed. The prepared PUR hot melt adhesive has excellent hydrolysis resistance, good low temperature resistance and high flexibility of the molecular chain, but due to its low internal polymerization energy, its adhesion is not good. Usually polyester/polyether polyol compounding is used to adjust the content of ester and ether groups, soft and hard segments, and then adjust
2022.05.26
Do you know PUR hot melt adhesive?
In recent years, the country's requirements for environmental protection are getting higher and higher, and environmentally friendly PUR hot melt adhesives have gradually replaced some solvent-based adhesives. PUR hot melt adhesives are widely used because they can provide high bonding strength for different substrates through covalent bonds, hydrogen bonds, secondary bonds, adhesion and cohesion, and transition layers. At present, the annual consumption of PUR hot melt adhesive is growing at a high speed. After recent years of research and development, the technology is becoming more and more mature.
2020.06.18
U.S. makes final anti-dumping review of China's barium carbonate
On January 21, 2009, the United States International Trade Commission issued a notice to make an anti-dumping sunset review final ruling on barium carbonate softener originating in China. The six members of the U.S. International Trade Commission voted unanimously that if the anti-dumping measures against barium carbonate originating in China are canceled, it may cause damage to the domestic industry of the United States to continue or recur in the foreseeable period. Therefore, the anti-dumping measures continue to be implemented.
New Breakthrough in Realizing Industrial Mass Production of Domestic Liquid Silicone Rubber
Imported liquid silicone rubber products have achieved thousands of tons of industrial production. And in comparison with foreign imported products, not only does not fall behind, the price is also reduced by more than half, reflecting the extremely high product cost performance. As we all know, the addition type liquid silicone rubber is widely used in high power LED packaging. Under the situation that the domestic LED industry is in urgent need of supporting packaging materials, liquid silicone rubber products undoubtedly have a huge market demand. The domestic liquid silicone rubber products were immediately sought after by the market as soon as they were launched,
