Mining Resin Anchoring Agent (Resin Cartridge)

Product Overview

Mining resin anchoring agent is a two-component, paste-like adhesive material formulated with unsaturated polyester resin as the main component, combined with curing agents, accelerators, and other auxiliary materials in precise proportions. It is packaged in a sausage-shaped cartridge form using polyester film分隔 as a separator, serving as an important industrial anchoring engineering material. Its working principle is as follows: during rock bolt installation, the bolt shank pushes the cartridge to the bottom of the borehole and rotates to stir. The bolt ruptures the outer film of the cartridge, allowing the two components to mix. A chemical reaction occurs, rapidly curing to form a solid anchor that firmly bonds the rock bolt to the surrounding rock strata. This material is primarily used for coal mine roadway support, tunnel construction, building structure reinforcement, and equipment foundation fixing.

Product Functions

In coal mine roadways and underground mining projects, the resin anchoring agent is used in conjunction with rock bolts and anchor cables, serving as a key material for ensuring surrounding rock stability. Its core functions are as follows:

1. Bonding the Rock Bolt to the Surrounding Rock: Firmly bonds the rock bolt shank to the borehole wall, enabling the rock bolt to bear tensile forces and form an effective support system.

2. Achieving Full-Length Anchoring: Through mixing, the resin fills the entire borehole, achieving full-length bonding between the rock bolt and the surrounding rock. This ensures stress is uniformly distributed along the entire anchor rod length, eliminating stress concentration points and significantly enhancing the integrity and stability of the support system.

3. Load Transfer: Effectively transfers the pressure from the surrounding rock to the rock bolt, jointly resisting surrounding rock deformation and preventing roof separation, rib spalling, and floor heaving.

4. Sealing and Barrier Function: The cured resin effectively seals the borehole, preventing groundwater and harmful gas infiltration, protecting the rock bolt from corrosion, and extending the service life of the support system.

Product Types

Based on gel time (curing speed), resin anchoring agents are mainly classified into the following types:

Note: The above gel times are measured at an ambient temperature of (22±1)°C.

Example of model designation: MSCK2340 indicates a mining resin anchoring agent, ultra-fast type, 23mm diameter, 40cm length.

Product Features

• Fast Curing and High Strength: Rapidly cures under normal temperature conditions, can bear loads promptly after installation, with reliable anchoring force.

• High Bond Strength: Forms an extremely strong bond with the rock bolt and borehole wall upon curing, providing anchoring force far exceeding that of cement grout.

• Good Fatigue Resistance: Excellent fatigue strength, capable of withstanding dynamic loads caused by surrounding rock pressure changes, blasting vibrations, etc., avoiding brittle failure.

• Water Resistance: Can cure normally even in the presence of water, avoiding the effects of moisture on curing rate and anchoring strength.

• Strong Adaptability: Suitable for various rock types including limestone, shale, sandstone, and siltstone; can anchor both steel and fiberglass rock bolts.

• Easy Operation: Cartridge-type design eliminates on-site mixing; automatically mixed during rock bolt rotation, facilitating mechanized and rapid construction.

• Corrosion Resistance and Sealing: Effectively seals the borehole after curing, preventing water and gas infiltration and protecting the rock bolt from corrosion.

Technical Parameters

Common Specifications

Mining resin anchoring agents cover diameters of 21–70mm and lengths of 300–880mm, with custom production available based on borehole diameter. Common specifications are as follows:

Applicable Standards

Mining resin anchoring agents comply with the following major standards:

• China Coal Industry Standard: MT/T 146.1 (Resin anchor bolts — Part 1: Anchoring agents)

• International Standard: ASTM F432 (Standard specification for roof and rock bolts and accessories)

• Safety Certification: China Mining Safety Certification (MA Mark) is available

Main Applications

Mining resin anchoring agents are widely used in the following fields:

• Coal mine underground roadway (coal roadway, semi-coal roadway, full-rock roadway) roof and rib rock bolt support

• Metal mine (gold mine, iron mine, etc.) roadway and chamber support

• Tunnel engineering surrounding rock reinforcement and shotcrete-bolt support

• Shaft equipment installation and fixing

• Building structure seismic reinforcement and equipment foundation anchoring

• Hydropower engineering prestressed rock bolt reinforcement

• Highway repair and slope/difficult wall shotcrete-bolt support

• Bridge and building foundation anchoring

Installation Method

1. Drill the borehole to the required depth according to design specifications, then blow out the rock powder from the hole using compressed air.

2. Insert the required number of resin cartridges into the borehole in sequence as per design requirements.

3. Use the rock bolt shank to push the cartridges to the bottom of the borehole, install a stirring adapter, and mix. The mixing time should be controlled within 15–30 seconds depending on the cartridge type.

4. After mixing, wait until the gel time has elapsed before releasing the drilling equipment and the connecting device.

5. Once the specified waiting time for the respective cartridge type has been reached, the rock bolt is ready to bear loads.

Storage and Transportation Precautions

• Store indoors at temperatures below 25°C, away from direct sunlight and sources of fire.

• Shelf life is 3 months when stored below 25°C.

• Avoid crushing, impact, and exposure to sunlight during transportation to prevent cartridge damage.

• Cartridges of different types and specifications should be stored separately with clear labeling.

Applicable Conditions and Limitations

• Applicable Rock Types: Limestone, shale, sandstone, siltstone, mudstone, etc..

• Not Applicable: Severely water-permeable rock sections and soft soil.