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06

2021-12

What is polyester resin?

Polyester resins are a class of high‑molecular‑weight polymers obtained through the polycondensation of diols with dicarboxylic acids, or of polyols with polycarboxylic acids. Polyester resins are classified into saturated polyester resins and unsaturated polyester resins. Unsaturated polyester adhesives consist primarily of unsaturated polyester resin, pigments and fillers, and various additives such as initiators. These adhesives exhibit low viscosity, excellent wettability, and good processability; after curing, they form films that are hard, highly transparent, and brightly glossy. They can cure rapidly at room temperature under pressure, possess good heat resistance, and offer superior electrical properties. However, their drawbacks include significant shrinkage, relatively low adhesive toughness, and poor resistance to chemical media and water, which limits their use to non‑structural applications. They are mainly employed for bonding fiberglass‑reinforced plastics and rigid plastics.

2021-12-06

06

2021-12

What is the difference between polyester and resin?

I. Differences in Nature 1. Polyester: A general term for polymers obtained through the polycondensation of polyols and polyacids. 2. Resin: An organic polymer that exhibits softening or melting upon heating, showing flow under external force when softened; at room temperature, it is solid or semi-solid, though it may occasionally exist in liquid form. II. Differences in Characteristics 1. Polyester Characteristics: Polyethylene terephthalate (PET) is produced via the polycondensation of terephthalic acid (PTA) and ethylene glycol (EG). Some of this PET is further processed by underwater pelletizing to yield the final product. Fiber-grade polyester chips are used to manufacture polyester staple fibers and polyester filaments, serving as a key raw material for polyester fiber producers.

2021-12-06

29

2021-10

Low-temperature isocyanate curing agent suitable for coating systems

A curing agent, also known as a hardener, maturing agent, or crosslinking agent, is a substance or mixture that promotes or controls the curing reaction. Resin curing involves chemical reactions such as condensation, ring closure, addition, or catalysis, leading to an irreversible transformation of thermosetting resins; this process is accomplished by the addition of a curing (crosslinking) agent.

2021-10-29

29

2021-10

Investigation of Factors Influencing Polyester–TGIC-Type Wrinkle-Pattern Powder Coatings

Wrinkle‑pattern powder coating is an artistic type of powder coating that achieves a textured, linear surface by incorporating pigments into the powder. It offers strong decorative appeal, can conceal imperfections in the substrate, and is resistant to pinholing. It places minimal demands on surface leveling and is widely used in applications such as doors and windows, steel‑wood furniture, sewing machines, instruments, and small electromechanical enclosures.

2021-10-29

29

2021-10

What’s the difference between epoxy resin adhesive and super glue?

Epoxy adhesive is an important thermosetting resin adhesive. In particular, owing to its excellent physical and mechanical properties, electrical insulation performance, chemical resistance, heat resistance, and bonding strength, epoxy adhesives formulated with it are commonly known as “universal adhesives.” Cyanoacrylate adhesive is a single-component formulation made from cyanoacrylate that cures rapidly upon exposure to moisture in the air.

2021-10-29

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