Analysis of Anchoring Agent Core Technology

In building reinforcement, mine support, and various infrastructure construction projects, anchoring technology is crucial for ensuring structural safety and stability. As the core material of this technology, the performance of anchoring agents is directly dependent on their inherent chemical reaction mechanisms. Different chemical compositions determine their distinct curing characteristics, strength performance, and applicable scenarios.

The performance of anchoring agents is closely related to their chemical reaction mechanism. Based on their main ingredients and curing methods, mainstream anchoring agents on the market can be divided into the following categories:

Unsaturated Polyester Resin Anchor

Mechanism: Based on free radical polymerization. The initiator (such as peroxide) and accelerator are typically encapsulated in two separate films, or placed on either side of a plastic bag. When the installer places the roll into the drilled hole and rotates the anchor, the films rupture, and the components mix under mechanical agitation, initiating a rapid chain polymerization reaction that cures.

Features: Extremely fast cure (several minutes to over ten minutes), high early strength, and easy installation. However, their shrinkage is relatively high, and their high-temperature resistance and long-term durability are slightly inferior to other types. They were once a mainstay in emergency support systems for mines, tunnels, and other applications.

Epoxy Resin Anchor

Mechanism: Based on the addition polymerization of epoxy groups and amine (or other) curing agents. They are typically packaged in double-tube capsules or two-component injection moldings, mixed and extruded using a specialized glue gun.

Features: Extremely high bond strength, low shrinkage, insensitive to moisture, and even suitable for underwater installation. Its excellent chemical resistance, heat resistance, and long-term creep properties make it a top choice for applications requiring the highest levels of safety and durability, such as high-performance buildings, bridges, and nuclear power facilities.

Vinyl Ester Resin Anchor

Mechanism: It combines the excellent properties of epoxy resin with the fast-curing characteristics of polyester. Containing vinyl ester groups at both ends of the molecule, its curing mechanism is similar to that of unsaturated polyester.

Features: It combines excellent corrosion resistance (similar to epoxy) with a fast cure speed, excellent mechanical strength and toughness, and performs exceptionally well in harsh conditions such as chemical environments and offshore platforms.

Modified Epoxy-Cement Composite Anchor

Mechanism: Epoxy resin emulsion is compounded with specialty cements and fillers, combining the high bonding strength of organic adhesives with the durability and environmental friendliness of inorganic cement materials.

Features: It is environmentally friendly and non-toxic (low VOC), has excellent compatibility with concrete substrates, has a similar coefficient of thermal expansion, and offers excellent high-temperature resistance (excellent performance under fire conditions), making it an ideal choice for green buildings and critical structures requiring high fire protection.

From fast-acting unsaturated polyester resins to high-strength, durable epoxy resins, corrosion-resistant vinyl ester resins, and green, fire-resistant modified epoxy-cement composite systems, the development of anchoring agent technology has consistently revolved around the pursuit of superior performance and wider applicability. A deep understanding of the chemical reaction mechanisms underlying these materials is fundamental to their proper selection and application. With increasing demands for construction and the growing popularity of environmental protection, composite, environmentally friendly anchoring agents that combine the advantages of organic polymers and inorganic materials will undoubtedly become the mainstream direction of future technological development and market application.