Pt-Re Catalyst for Styrenic Block Copolymer Hydrogenation
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Solution Overview
Problem
Conventional catalyst compositions fail to effectively control the hydrogenation conversion of unsaturated alkenyl double bonds in styrenic block copolymers, leading to poor weather resistance, heat resistance, and anti-oxidation performance, limiting their application as outdoor materials.
Innovation Solution
A catalyst composition comprising a platinum-and-rhenium containing phosphorus compound disposed on an oxide carrier, such as titanium oxide, aluminum oxide, or zirconium oxide, is used for hydrogenating styrenic block copolymers, allowing for high reactivity and selective hydrogenation of unsaturated alkenyl double bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalyst compositions are used for hydrogenating styrenic block copolymers, then the hydrogenation process can proceed, but the hydrogenation conversion of unsaturated alkenyl double bonds cannot be effectively controlled
Solution Approach 1:
The patent modifies the catalyst composition parameters by incorporating specific metal combinations (precious metals like Pt, Pd, Rh with base metals like Ni, Cu, Zn) and controlling metal content ratios (0.1-10 wt% precious metal, 90-90 wt% base metal). These parameter changes enable precise control over hydrogenation conversion of unsaturated alkenyl double bonds while maintaining reproducibility
Solution Approach 2:
The invention uses composite catalyst materials combining precious metals and base metals in specific ratios, supported on carrier materials. This composite structure allows the catalyst to achieve both high activity for hydrogenation and controlled selectivity, resolving the contradiction between conversion control and performance consistency
2Ease of manufacture
If styrenic block copolymers with unsaturated alkenyl double bonds are used, then copolymerization is simplified, but weather resistance, heat resistance and anti-oxidation performance deteriorate
Solution Approach 1:
The patent applies partial hydrogenation to selectively reduce unsaturated alkenyl double bonds while preserving the block copolymer structure. By controlling hydrogenation conversion (partial rather than complete), the method improves weather and heat resistance while maintaining ease of manufacture through the retained copolymer architecture
Solution Approach 2:
The invention changes the chemical state parameter of the polymer by hydrogenating unsaturated bonds to saturated bonds. This parameter change (from unsaturated to saturated) directly improves resistance to weathering, heat, and oxidation while the controlled nature of the process maintains manufacturing simplicity
3Object-affected harmful factors
If hydrogenation conversion is increased to improve performance, then weather resistance and heat resistance improve, but control over aromatic double bond conversion becomes difficult
Solution Approach 1:
The patent achieves local quality differentiation in hydrogenation by using specific catalyst compositions that preferentially hydrogenate unsaturated alkenyl double bonds over aromatic double bonds. The catalyst's selective activity creates different reaction rates for different bond types, enabling improved heat resistance through alkenyl hydrogenation while maintaining aromatic bond integrity
Solution Approach 2:
The invention changes kinetic parameters through catalyst selection and reaction condition optimization (temperature, pressure, time) to achieve selective hydrogenation. By adjusting these parameters, the process improves heat resistance via alkenyl saturation while controlling aromatic double bond conversion through selective catalysis
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 catalyst composition achieves hydrogenation conversion of non-aromatic double bonds at 85% or above, with optional control of aromatic double bond conversion, enhancing the performance of styrenic block copolymers in terms of weather resistance and heat resistance.
Implementation Method 1
A catalyst composition comprising a platinum-and-rhenium containing phosphorus compound disposed on an oxide carrier, such as titanium oxide, aluminum oxide, or zirconium oxide, is used for hydrogenating styrenic block copolymers
Implementation Method 2
The catalyst composition achieves hydrogenation conversion of non-aromatic double bonds at 85% or above
Data Source
AI summary
A catalyst composition, a method for hydrogenating styrenic block copolymer employing the same, and a hydrogenated polymer from the method are provided. The method for hydrogenating styrenic block copolymer includes subjecting a hydrogenation process to a styrenic block copolymer in the presence of a catalyst composition. In particular, the catalyst composition includes an oxide carrier, and a catalyst disposed on the oxide carrier, wherein the catalyst includes a platinum-and-rhenium containing phosphorus compound.