Thermoplastic Composite Rebar Coating for Alkali Resistance and Bending

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Solution Overview

Problem

Existing concrete reinforcing materials using thermosetting resin have low production efficiency, high manufacturing costs, and limited secondary processing capabilities, while thermoplastic resin alternatives lack sufficient alkali resistance and handling ability.

Innovation Solution

A concrete reinforcing composite material with a core formed by a fiber bundle and a coating layer of thermoplastic resin, where the coating layer thickness is at least 84 μm and the fiber volume content is at least 60%, allowing for improved alkali resistance, strength, and flexibility, enabling secondary processing like bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermosetting resin is used for concrete reinforcing material, then alkali resistance is improved, but production efficiency deteriorates and manufacturing cost increases due to lengthy thermal curing process

Engineering Contradiction:

Improvealkali resistanceVSAvoidproduction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the resin type from thermosetting to thermoplastic, fundamentally altering the material parameters. This enables continuous production without thermal curing, dramatically improving productivity while maintaining adequate alkali resistance through proper coating layer design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure with a core and coating layer using different materials (fiber bundle core with thermoplastic resin coating). This composite approach allows the core to provide structural strength while the coating layer provides alkali resistance, resolving the contradiction between durability and生产效率

Inventive Principle:

Principle #40Composite materials

2Reliability

If thermosetting resin is used for concrete reinforcing material, then alkali resistance is improved, but manufacturing cost increases due to lengthy thermal curing process

Engineering Contradiction:

Improvealkali resistanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Changing from thermosetting to thermoplastic resin eliminates the thermal curing step, reducing manufacturing complexity and cost. The thermoplastic resin can be processed by simpler methods like extrusion or dip-coing, making production more economical

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a relatively thin coating layer of thermoplastic resin (8-50 μm) that provides sufficient alkali resistance at lower cost compared to the thick sections required for thermosetting resins, reducing material costs

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If thermoplastic resin is used for concrete reinforcing material, then production efficiency is improved, but alkali resistance deteriorates

Engineering Contradiction:

Improveproduction efficiencyVSAvoidalkali resistance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses a composite structure where the thermoplastic resin coating layer (8-50 μm) provides alkali resistance protection for the fiber bundle core. This layered composite approach maintains productivity benefits while achieving sufficient durability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different properties to different parts: the core provides structural strength while the outer coating layer specifically provides alkali resistance. This local differentiation allows each layer to optimize its function, with the coating layer thickness (8-50 μm) specifically designed for chemical protection

Inventive Principle:

Principle #3Local quality

4Adaptability or versatility

If thermoplastic resin is used for concrete reinforcing material, then secondary processing capability is improved, but handling ability deteriorates

Engineering Contradiction:

Improvesecondary processing capabilityVSAvoidhandling ability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent selects specific thermoplastic resins with appropriate melting points and rheological properties that enable both secondary processing and handling. The resin parameters are optimized to provide flexibility when needed while maintaining sufficient rigidity for handling during installation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12540099B2Concrete reinforcing composite material and concrete reinforcing rebar

Publication Date: 2026.02.03 KOBE STEEL LTD

AI summary

Provided is a concrete reinforcing composite material that is impregnated with a thermoplastic resin having excellent alkali resistance and handleability. In a concrete reinforcing composite material 10, a core material 12 is formed from a fiber bundle of reinforcing fibers. The core material 12 is covered with a coating layer 14 made of a thermoplastic resin. The core material 12 is impregnated with the thermoplastic resin. The thickness of the coating layer 14 is 84 μm or more. The fiber volume content Vf of the core material 12 is 60% or more.