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Concepts and Differences Among Various Viscosities of Coatings

Concepts and Differences Among Various Viscosities of Coatings

The viscosity of a coating—also known as its consistency—is an important parameter that describes the fluid properties within the coating. It reflects the inherent cohesive forces present in the fluid itself, which create resistance to relative flow within the fluid. In other words, viscosity is a manifestation of the intermolecular forces within the coating, and it determines how easily the coating can flow internally when subjected to external forces.

18

2024

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07

Formation mechanism of saturated polyester resin

Formation mechanism of saturated polyester resin

Saturated polyester resins are primarily formed through a polycondensation reaction—a process in which small-molecule monomers are linked together via chemical bonds to create high-molecular-weight polymer chains. During this process, small-molecule byproducts are inevitably produced; these byproducts are released as part of the reaction and simultaneously promote the growth and formation of the polymer chains. In the preparation of saturated polyester resins, polyols and polybasic acids (or monocarboxylic acids) serve as the primary monomer raw materials. Under the presence of a catalyst, polycondensation is carried out via esterification or transesterification reactions, yielding high-molecular-weight polyester resins. Based on their chemical structural characteristics, saturated polyester resins can be classified into linear polymers and branched polymers.

16

2024

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07

Raw Materials and Classification of Saturated Polyester Resins

Raw Materials and Classification of Saturated Polyester Resins

Saturated polyester resin is a polymer compound in which all the carbon-carbon bonds in the main chain are saturated, meaning they do not contain any unsaturated double bonds. This type of resin is typically produced via a polycondensation reaction between diols and dicarboxylic acids and exhibits excellent physical and chemical properties. Depending on the raw materials and synthesis methods used, saturated polyester resins can be classified into several types, such as linear polymers, branched polymers, and modified polyester resins.

15

2024

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07

Classification of Epoxy Resin Curing Agents

Classification of Epoxy Resin Curing Agents

An epoxy resin curing agent is a chemical substance that undergoes a chemical reaction with epoxy resin to form a cross-linked, three-dimensional polymer. It plays a crucial role in the application of epoxy resins by transforming linear resins into tough, solid, three-dimensional structures, thereby enhancing various properties of the material, such as strength, wear resistance, chemical resistance, and heat resistance.

13

2024

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07

Introduction to Unsaturated Polyesters

Introduction to Unsaturated Polyesters

Unsaturated polyester is an important class of thermosetting resins, primarily synthesized via a polycondensation reaction between unsaturated dicarboxylic acids and diols. In this process, the carboxyl groups in the acid react with the hydroxyl groups in the alcohol, releasing water molecules and forming ester bonds that serve as the main chain linkages, while the unsaturated double bonds in the acid molecules are retained. This unique structural feature endows unsaturated polyesters with distinctive reactive properties.

11

2024

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07

Measures to Reduce Paper Shrinkage and Variation During UV Printing

Measures to Reduce Paper Shrinkage and Variation During UV Printing

In the UV printing process, the shrinkage and deformation of paper stem from a multitude of complex factors, including the paper’s intrinsic physical properties, the requirements of the UV printing process itself, and variations in external environmental conditions. These shrinkage and deformation effects significantly impact print quality and the appearance of the finished product. To effectively control these changes, mitigate their potential adverse effects on print quality, and ensure the precision and overall quality of the final product, control measures are particularly crucial.

10

2024

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07

What is modified epoxy resin?

What is modified epoxy resin?

Epoxy resin is a thermosetting resin that falls within the category of organic polymer compounds. Its primary characteristic lies in its molecular structure, which contains two or more epoxy groups. Under appropriate conditions, these epoxy groups can undergo crosslinking reactions, forming a three-dimensional network structure known as the cured product. The main chain of an epoxy resin can be composed of aromatic, cycloaliphatic, or aliphatic segments; this structural diversity gives rise to a wide variety of epoxy resins with significantly different properties. While epoxy resins offer numerous advantages, they also have certain drawbacks, including high brittleness, insufficient impact resistance, poor durability, and inadequate fatigue resistance. Driven by multiple factors—such as the limitations of epoxy resin performance, growing market demand, and advances in technology—modified epoxy resins have emerged and continue to develop.

09

2024

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07

Advantages and Disadvantages of Various Epoxy Resin Synthesis Methods

Advantages and Disadvantages of Various Epoxy Resin Synthesis Methods

Epoxy resins have consistently occupied a pivotal position in the chemical industry thanks to their outstanding performance and wide range of applications. As an important class of thermosetting resins, epoxy resins exhibit numerous superior properties and are highly favored across various industries. Tracing the development history of epoxy resins, the diversity of their synthesis methods undoubtedly serves as a vivid testament to their continuous evolution and innovation. From the early phenol-formaldehyde method and aromatic amine method to later acid-catalyzed and propylene oxide methods, each new approach has marked a significant leap forward in epoxy resin preparation technology. These traditional methods not only laid the foundation for the epoxy resin industry but also provided valuable experience and inspiration for subsequent technological advancements.

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2024

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07

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