Author Archives: Vichem
Types of polyester resins used in composite manufacturing
In composite manufacturing, polyester resins are widely used thanks to their easy processing and reasonable cost. However, each type of polyester resin has different structures and mechanical properties. These differences lead to noticeable variations in...
Read moreWhat Is Dyne Level? Meaning in Printing and Surface Coating
In printing and surface coating, adhesion always plays a crucial role. The Dyne level reflects the surface energy and determines how well inks or coatings adhere. When the Dyne level meets the required standard, the...
Read moreHow is Polybutene-1 different from Polyisobutene?
Within the polyolefin family, Polybutene-1 (PB-1) and Polyisobutene (PIB) are often viewed as similar because they originate from butene. However, their structures and degrees of crystallinity are completely different. These differences determine the durability, gas-barrier...
Read moreVichem at CHINACOAT 2025 – Global Connections & New Solutions
China Coat Expo 2025 takes place in Shanghai from November 25 to 27, featuring more than 1,450 international coating-material suppliers. The exhibition is large in scale, professionally organized, and brings together all chemical groups and...
Read moreGas Permeability of Desmophen — The Critical Hidden Factor
In PU coating production, parameters like hardness or gloss are often prioritized. However, another crucial property is frequently overlooked when evaluating long-term performance. That is the gas permeability of Desmophen, a factor that defines the...
Read moreWeather Durability of Powder Coatings: The Real Role of Uralac
Hot and humid climates create major challenges for outdoor coatings. Strong UV and high moisture make the coating degrade fast. Powder coatings therefore need stable polyester and a strong polymer network. The weather durability of...
Read moreWhy Desmodur HDI Delivers Superior Outdoor Durability
Outdoor coatings must resist sunlight, rain, heat, and chemicals. These factors damage the film quickly if the wrong raw materials are used. In common isocyanates, HDI and TDI differ greatly in durability. Molecular structure decides...
Read moreWhy Ink Fails to Dry: Formulation Issue or Substrate Problem?
In flexible packaging printing, many factories face the issue of ink not dry even when dried at the correct temperature. The printed surface feels tacky, smears easily, and becomes unstable in color. This issue slows...
Read moreWhy Is Polyester Hard to Dye? Dye Absorption Mechanism
Polyester is favored in textiles for its strength and stable shape. Yet many mills face problems because hard-to-dye polyester limits shade development. Polymer properties affect dye uptake and shade depth. Understanding the interaction mechanism helps...
Read morePIB32 and Its Applications in Lubricant Oils
PIB32 is a medium polyisobutylene widely used in lubricant oils. This additive helps stabilize the oil film and reduce loss during continuous operation. Many technical formulations choose this additive to create a stable lubricating layer...
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