Isocyanurate Resin Compositions for Chemical Anchor Pull-Out Strength

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Solution Overview

Problem

Chemical anchors based on acrylates exhibit reduced performance at elevated temperatures, such as 80 °C and 160 °C, with weakened load-bearing capacity and increased shrinkage during curing at room temperature, posing a safety risk in fire scenarios.

Innovation Solution

A resin composition comprising isocyanurate compounds as a base resin in a multi-component reactive resin system, which improves bond strength at elevated temperatures and reduces shrinkage during curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If acrylates are used as base resin in chemical anchors, then fast curing is achieved, but performance at elevated temperatures deteriorates

Engineering Contradiction:

Improvecuring speedVSAvoidperformance at elevated temperatures

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the chemical parameter of the base resin from acrylate to isocyanurate compound, which fundamentally alters the polymerization characteristics and thermal properties. This parameter change enables the resin to maintain structural integrity at elevated temperatures while still achieving adequate curing speed through the reactive resin mixture

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite resin system combining isocyanurate compound as base resin with reactive diluents, fillers, and curing agents. This composite approach allows optimization of both curing speed and high-temperature performance by selecting compatible components that work synergistically

Inventive Principle:

Principle #40Composite materials

2Productivity

If acrylates are used as base resin, then fast polymerization occurs, but shrinkage during curing increases

Engineering Contradiction:

Improvepolymerization speedVSAvoidshrinkage control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

Changing from acrylate to isocyanurate compound as base resin fundamentally changes the polymerization mechanism and shrinkage characteristics. The isocyanurate-based system exhibits reduced shrinkage during curing while maintaining productive hardening through the multi-component reactive system

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite resin system incorporates isocyanurate compound with specific reactive diluents and fillers that compensate for and reduce shrinkage. The combination of components creates a balanced formulation that achieves both fast curing and minimal shrinkage

Inventive Principle:

Principle #40Composite materials

3Loss of time

If acrylates are used as base resin, then rapid hardening is achieved, but fire resistance decreases

Engineering Contradiction:

Improvehardening timeVSAvoidfire resistance

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameter from acrylate to isocyanurate compound, which inherently provides better fire resistance due to the stable isocyanurate ring structure. This parameter change maintains rapid hardening through the reactive mixture while significantly improving fire resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of rapid polymerization (which can cause overheating and degradation) into a benefit by using isocyanurate compounds that polymerize exothermically but maintain structural stability at high temperatures, thus improving fire resistance while achieving fast hardening

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 use of isocyanurate compounds enhances pull-out strength and minimizes shrinkage in chemical anchors, ensuring structural integrity during fires and maintaining load-bearing capacity.

Implementation Method 1

Once the two components are mixed the resin can form into a thermoset by a radically hardening reaction, i.e. polymerization

Methodology Applied

Scientific EffectRadical polymerization: Photopolymerisation

Data Source

PatentEP4574876A1Resin compositions comprising isocyanurates for improving pull out performance of chemical anchors

Publication Date: 2025.06.25 HILTI AG

AI summary

The present invention relates to a resin composition comprising at least one compound of isocyanurate according to formula (I) as a base resin and a use thereof in a multi-component reactive resin system for anchoring means to improve load values at elevated temperatures and to reduce shrinkage. The present invention also relates to a multi-component reactive resin system, comprising a reactive resin component (A) and a curing component (B), a mortar composition comprising the multi-component reactive resin system and a method for the chemical fastening of construction elements in boreholes.