Silane Mixture for Rubber Rolling Resistance

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Solution Overview

Problem

Existing silane mixtures in rubber compounds fail to achieve optimal rolling resistance and dynamic stiffness, which are crucial for tire performance and durability.

Innovation Solution

A silane mixture comprising specific silane formulas (I) and (II) with defined molar ratios, which can include oligomers formed through hydrolysis and condensation, applied to supports like silica, enhancing adhesion and crosslinking properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional silanes are used in rubber mixtures, then basic crosslinking function is achieved, but rolling resistance and dynamic stiffness remain suboptimal

Engineering Contradiction:

Improvetire performance and durabilityVSAvoidsilane mixture composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a composite silane system combining two distinct silane compounds: a polysulfide-containing silane (Formula I) and a polyether-containing silane (Formula II). This composite approach leverages the complementary properties of each component - the polysulfide provides crosslinking functionality while the polyether contributes to dynamic stiffness and rolling resistance optimization, achieving superior tire performance through material composition rather than structural complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention optimizes specific molecular parameters including the polysulfide chain length (n=1-3), polyether chain length (r=3-10), and silane molar ratio (20:80 to 86:14). By precisely controlling these chemical parameters, the formulation achieves optimal balance between rolling resistance and dynamic stiffness without requiring complex mixture compositions

Inventive Principle:

Principle #35Parameter changes

2Strength

If silane mixtures are applied to silica support, then adhesion and crosslinking properties are enhanced, but manufacturing process complexity increases

Engineering Contradiction:

Improveadhesion and crosslinking propertiesVSAvoidprocess simplicity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The silane mixture is pre-formulated with optimized ratios of polysulfide-containing silane and polyether-containing silane before application to silica. This preliminary preparation ensures proper adhesion and crosslinking properties are achieved without requiring complex multi-step manufacturing processes, as the optimized composition delivers enhanced performance through simple application

Inventive Principle:

Principle #10Preliminary action

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 silane mixture significantly improves rolling resistance and dynamic stiffness in rubber compounds, leading to better tire performance and durability.

Implementation Method 1

which can include oligomers formed through hydrolysis and condensation

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

which can include oligomers formed through hydrolysis and condensation

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS11542286B2Silane mixtures and process for preparing same

Publication Date: 2023.01.03 EVONIK OPERATIONS GMBH

AI summary

The invention relates to silane mixtures comprising a silane of the formula I(R1)y(R2)3-ySi—R3—(S—R4)n—Sx—R5 (I)and a silane of the formula II(R1)y(R2)3-ySi—R3—Si(R1)y(R2)3-y (II)where the molar ratio of silane of the formula I to silane of the formula II is 15:85-90:10.The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.