Polyurethane resin, paint, structure, and article

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Solution Overview

Problem

Polyurethane resins used in synthetic artificial leathers face a trade-off between cold-resistant flexibility and chemical resistance, where improving flexibility in cold areas compromises chemical resistance, and vice versa.

Innovation Solution

A polyurethane resin formulation using a polycarbonate diol with a specific molecular weight and a linear aliphatic isocyanate component, combined with a short-chain diol or diamine component, to achieve a balance between cold-resistant flexibility and chemical resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If cold-resistant flexibility is improved by modifying the resin skeleton, then flexibility in cold areas is enhanced, but chemical resistance deteriorates because chemicals can readily penetrate into the modified resin structure

Engineering Contradiction:

Improvecold-resistant flexibilityVSAvoidchemical resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the molecular weight parameter of the polycarbonate diol to a specific range (500-3000) and adjusts the compositional parameters of the polyol component (specific proportions of polycarbonate diol, short-chain diol, and short-chain diamine) to achieve optimal balance between cold-resistant flexibility and chemical resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite polyol system combining polycarbonate diol, short-chain diol, and short-chain diamine in specific proportions. This composite approach allows the resin to achieve both cold-resistant flexibility (from the polycarbonate diol backbone) and chemical resistance (from the crosslinked structure formed by short-chain diol and diamine)

Inventive Principle:

Principle #40Composite materials

2Reliability

If polycarbonate polyol is used to improve lightfastness, then lightfastness is excellent, but flexibility is reduced

Engineering Contradiction:

ImprovelightfastnessVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent specifies a number-average molecular weight range of 500-3000 for the polycarbonate diol, which is lower than conventional high molecular weight polycarbonate polyols. This parameter change maintains the lightfastness benefits of polycarbonate while improving flexibility by reducing molecular weight

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces short-chain diol and short-chain diamine components that create localized flexible segments within the polymer chain. These local modifications provide flexibility without compromising the overall lightfastness provided by the polycarbonate diol backbone structure

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20210230345A1Polyurethane resin, paint, structure, and article

Publication Date: 2021.07.29 DAINICHISEIKA COLOR & CHEMICALS MFG CO LTD

AI summary

Disclosed is a polyurethane resin containing a polyol component and an isocyanate component, wherein (1) the polyol component contains a polycarbonate diol component, and the isocyanate component contains a linear aliphatic isocyanate, (2) the polycarbonate diol component has a number-average molecular weight of 500 to 3000, and contains a diol-derived structure having 3 to 10 carbon atoms in the structure thereof, and (3) 10 mol % or more of the isocyanate component is a linear aliphatic isocyanate component having 4 to 10 carbon atoms.