Layered Polyurethane Wear Parts Adhesion

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Solution Overview

Problem

Different types of polyurethane with varying hardness adhere poorly to each other, making the manufacture of layered polyurethane difficult and resulting in cracks in the interface between layers.

Innovation Solution

A method involving the sequential curing of polyurethane layers with specific hardness ratios, where a partial layer of one type is allowed to cure before the completion of the second layer, and optional additives are used to enhance adhesion, with insert elements for modifying mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If different types of polyurethane with differing hardness are combined to enhance mechanical properties and wear resistance, then the performance of the wear-resistant part is improved, but the adhesion between layers deteriorates causing cracks at the interface

Engineering Contradiction:

Improvemechanical properties and wear resistanceVSAvoidadhesion between layers

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

A partial layer of the second polyurethane type is poured and allowed to cure for a certain time before completing the second layer. This preliminary curing action creates a stable interface that improves adhesion between different polyurethane types, preventing cracks while maintaining enhanced mechanical properties and wear resistance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The second polyurethane layer is divided into two parts: a partial layer that is poured first and allowed to cure, and a remaining quantity that is poured afterward to complete the layer. This segmentation allows the interface to stabilize during the curing of the partial layer, improving overall adhesion between layers.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If different types of polyurethane with differing hardness are combined to utilize their properties better, then the functional performance is enhanced, but the manufacturing difficulty increases due to poor adhesion

Engineering Contradiction:

Improveutilization of polyurethane propertiesVSAvoidmanufacture of layered polyurethane

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The partial layer of the second polyurethane type is poured and cured before completing the second layer. This preliminary action allows the interface to stabilize, making the manufacturing process of layered polyurethane with different hardness types feasible and reliable.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The second layer is segmented into a partial layer and a remaining quantity, with the partial layer being processed separately through pouring and curing. This segmentation simplifies the manufacturing process by creating stable interfaces between different polyurethane types.

Inventive Principle:

Principle #1Segmentation

3Productivity

If a complete second layer of different polyurethane is poured immediately without intermediate curing, then the manufacturing process is simpler and faster, but adhesion deteriorates causing interface cracks

Engineering Contradiction:

Improvemanufacturing speedVSAvoidadhesion between layers

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A partial layer of the second polyurethane type is poured and allowed to cure for a certain time before the remaining quantity is poured to complete the second layer. This preliminary curing step ensures reliable adhesion between layers while maintaining manufacturing efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The second layer is divided into a partial layer and a remaining quantity, with the partial layer being cured before completing the layer. This segmentation approach balances manufacturing speed with adhesion reliability by creating stable interfaces during the curing process.

Inventive Principle:

Principle #1Segmentation

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

This method achieves good and rapid adhesion between polyurethane layers, enhancing wear resistance and mechanical properties, suitable for applications like sealing rings in transport pipelines.

Implementation Method 1

allowing the partial layer of polyurethane of the second type to cure for a certain time

Methodology Applied

Scientific EffectCuring: Phase Change

Data Source

PatentEP1749633B1Method for manufacturing a flexible wear-resistant part of layered polyurethane and product manufactured in accordance with said method

Publication Date: 2008.11.12 HERIKON

Figure 1a
Figure 1b
Figure 2a

AI summary

The invention relates to a method for manufacturing a flexible wear-resistant part (1,10) of layered polyurethane. The method comprises the steps of pouring into a mould for the wear-resistant part a quantity of polyurethane of a first type (3) with a first hardness in order to form a first layer; allowing the first layer of polyurethane to cure for a certain time; pouring over the first layer of polyurethane a part of a quantity of polyurethane of a second type (2) with a second hardness which differs from the first hardness in order to form a part of a second layer; allowing the part of the second layer of polyurethane to cure for a certain time; pouring the rest of the quantity of polyurethane of the second type (2) over the part of the second layer in order to complete the second layer; and allowing curing of the moulded wear-resistant part.