Polychloroprene Elastomer Composition for Extrusion and Strength

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Solution Overview

Problem

Conventional polychloroprene elastomer compositions fail to simultaneously enhance both extrusion processability and mechanical properties such as modulus and tensile strength.

Innovation Solution

A polychloroprene elastomer composition is developed by blending a polychloroprene sol and a polychloroprene gel at a specific ratio, combined with a thiuram compound, which improves extrusion processability and mechanical properties. The composition includes 100 parts of polychloroprene elastomer with 0.2 to 5 parts of thiuram compound, specifically tetraethylthiuram disulfide, tetrabutylthiuram disulfide, or tetrakis(2-ethylhexyl)thiuram disulfide, and is processed through emulsion polymerization with controlled monomer ratios and conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If sulfur-modification of polychloroprene sol is used to improve modulus and tensile strength, then mechanical properties are improved, but extrusion processability deteriorates

Engineering Contradiction:

Improvemechanical propertiesVSAvoidextrusion processability

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by introducing specific thiuram compounds (tetraethylthiuram disulfide, tetrabutylthiuram disulfide, or tetrakis(2-ethylhexyl)thiuram disulfide) at controlled amounts (0.2 to 5 parts by mass per 100 parts of polychloroprene elastomer). This chemical parameter modification simultaneously improves both mechanical properties and extrusion processability, resolving the contradiction between strength enhancement and manufacturing ease

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite elastomer system by combining polychloroprene sol and polychloroprene gel in a specific ratio (sol/gel ratio of 30/70 to 80/20). This composite structure integrates the advantages of both sol (good processability) and gel (high strength), while the added thiuram compound further enhances the composite properties to achieve both improved mechanical strength and extrusion processability

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If gel polymer is added to improve extrusion processability, then ease of manufacture is improved, but mechanical properties deteriorate

Engineering Contradiction:

Improveextrusion processabilityVSAvoidmechanical properties

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent modifies the composition parameters by adding thiuram compounds (0.2 to 5 parts by mass per 100 parts elastomer) to compensate for the mechanical property reduction caused by gel addition. This parameter adjustment restores and enhances tensile strength and modulus while maintaining the improved extrusion processability provided by the gel component

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a balanced composite system where polychloroprene gel provides extrusion processability improvements, while polychloroprene sol and thiuram compounds compensate for mechanical property losses. The specific sol/gel ratio (30/70 to 80/20) and thiuram addition create a synergistic composite that achieves both goals simultaneously

Inventive Principle:

Principle #40Composite materials

3Reliability

If thiuram or thiazole compound is added to improve scorching resistance, then thermal stability is improved, but mechanical properties and extrusion processability remain insufficient

Engineering Contradiction:

Improvescorching resistanceVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent optimizes the amount of thiuram compound added (0.2 to 5 parts by mass per 100 parts elastomer), which is a critical parameter change. This optimized dosage provides sufficient scorching resistance while simultaneously improving mechanical properties and extrusion processability, unlike conventional additions that only targeted scorching resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent integrates thiuram compounds into a composite system containing both polychloroprene sol and gel. The thiuram compound works synergistically with the sol/gel matrix to provide scorching resistance while the composite structure maintains and enhances mechanical properties and processability, achieving multi-property improvement simultaneously

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP2399953B1Polychloroprene elastomer composition, process for producing same, and vulcanizate and molded object

Publication Date: 2017.03.15 DENKA CO LTD

AI summary

Provided is a polychloroprene elastomer composition superior in extrusion processability and mechanical properties, a production method thereof, and vulcanized and molded articles thereof. A polychloroprene elastomer composition, comprising 100 parts by mass of a Polychloroprene elastomer containing a polychloroprene sol and a polychloroprene gel and 0.2 to 5 parts by mass of a thiuram compound, wherein the blending rate of the polychloroprene sol to the polychloroprene gel (sol/gel) is 30/70 to 80/20 by mass.