Pumpable Organo-Mineral Bolt Sealing Composition for Rapid Strength
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Solution Overview
Problem
Existing two-component compositions for anchoring bolts in underground operations do not meet the mechanical requirements for high shear modulus, modulus of elasticity, and compressive strength, and are difficult to mechanize and automate, particularly in applications requiring rapid setting times and flexibility.
Innovation Solution
A two-component composition comprising alkali metal silicate, polyisocyanate prepolymer, cement, and additives like polyol, plasticizer, and gelling agent, which forms an organo-mineral material with compressive strength of at least 17 MPa and shear strength of at least 7 MPa within 20 seconds to 15 minutes, suitable for dynamic anchoring bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two-component compositions based on isocyanate and alkali metal silicate are used, then the anchoring bolt can be sealed in the ground, but the mechanical properties (shear modulus, modulus of elasticity, compressive strength) are insufficient for demanding applications
Solution Approach 1:
The patent combines organic isocyanate-based polymers with inorganic alkali metal silicates and cement to create a composite material that achieves both high compressive strength (≥17 MPa) and adequate shear modulus, satisfying demanding mechanical property requirements while maintaining sealability
Solution Approach 2:
The patent modifies the chemical composition parameters by introducing specific ratios of polyols, polyisocyanates, alkali metal silicates, and cement, along with controlling molecular mass ranges and添加 specific additives, to achieve the required mechanical properties within 20-15 minutes setting time
2Strength
If sealing systems based on cartridges containing polyurethane or polyester resins are used, then good mechanical properties can be achieved, but the implementation is complicated, lengthy, tedious and difficult to mechanize and/or automate
Solution Approach 1:
The patent extracts the sealing material from rigid cartridge containers and transforms it into a pumpable two-component liquid system that can be injected directly into the ground through injection equipment, enabling mechanized and automated application while maintaining good mechanical bending resistance
Solution Approach 2:
The patent develops a pumpable two-component composition that can be delivered through injection pumps using hydraulic or pneumatic principles, allowing for automated injection-sealing of anchoring bolts without the need for manual cartridge installation
3Loss of time
If existing two-component compositions are used, then injection-sealing can be performed, but the setting time is too long or the product becomes brittle for rapid application
Solution Approach 1:
The patent carefully controls the molecular mass of polyols (50-200 g/mol) and the ratios of reacting components to achieve rapid setting (20-15 minutes) while preventing excessive brittleness, balancing reaction speed with final material flexibility
Solution Approach 2:
The patent introduces gelling agents as intermediaries that control the setting process, allowing the mixture to gel without immediately setting, providing working time for injection while ensuring rapid final setting and preventing brittleness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition provides improved mechanical properties and flexibility, enabling mechanized and automated application, with rapid setting times and high mechanical strength, suitable for anchoring bolts in demanding applications.
Implementation Method 1
as they are being mixed, give rise to one or more chemical reactions which harden the mixture
Implementation Method 2
polymerization catalyst comprising at least one primary amine or alcohol function
Implementation Method 3
gelling agent manifesting the final mixture of the two components A and B in the form of a gel without causing the mixture of said components to set
Data Source
AI summary
The present invention relates to a two-component composition consisting of a component A intended to be mixed, in situ, with a component B in order to form an injectable or pumpable organo-mineral compound, in particular for injection-sealing dynamic anchor bolts, comprising at least one alkali metal silicate, at least one polyisocyanate derivative and at least one cement. The component A further contains at least one polyol having a molecular mass of between 50 and 200 g/mol, at least one polymerisation catalyst comprising at least one polar function and at least one gelling agent and the component B further comprises at least one suitable.