Separation Membrane Element with High-Crystalline Polypropylene Channel
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Solution Overview
Problem
Separation membrane elements face issues with curling and poor handleability during production, which affects their performance and efficiency, especially under pressure conditions.
Innovation Solution
A separation membrane element with a permeate-side channel member composed of high-crystalline polypropylene and a porous supporting layer, where the high-crystalline polypropylene content ranges from 40 to 95% by weight and has a melting endothermic energy amount of 20 to 70 J/g, and a sheet channel member with projections containing the same composition, ensuring stability and handleability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separation membrane or sheet channel member is used to achieve high-performance water production under pressure, then water production performance is improved, but the separation membrane or sheet channel member curls and handleability deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the channel member material by specifying a melting point of 160°C or higher and a melting endothermic energy amount of 30 J/g or more. These parameter changes ensure the channel member maintains structural stability under pressure (improving water production performance) while preventing curling during production (improving handleability).
Solution Approach 2:
The invention uses composite material composition requirements, specifying that the channel member contains 40-95 wt% high-crystalline polypropylene and 5-60 wt% low-crystalline α-olefin polymer. This composite structure combines the high melting point and structural stability of high-crystalline polypropylene with the flexibility and processability of low-crystalline α-olefin polymer, resolving the contradiction between performance and handleability.
2Productivity
If separation membrane or sheet channel member is used to achieve high-performance water production under pressure, then water production performance is improved, but the separation membrane or sheet channel member curls and manufacturing precision deteriorates
Solution Approach 1:
The invention changes the thermal parameters of the channel member material by specifying a melting point of 160°C or higher and a melting endothermic energy amount of 30 J/g or more. These parameter changes ensure the channel member maintains structural stability under pressure (improving water production performance) while preventing curling during production (improving manufacturing precision).
Solution Approach 2:
The invention uses composite material composition requirements, specifying that the channel member contains 40-95 wt% high-crystalline polypropylene and 5-60 wt% low-crystalline α-olefin polymer. This composite structure combines the high melting point and structural stability of high-crystalline polypropylene with the flexibility and processability of low-crystalline α-olefin polymer, resolving the contradiction between performance and manufacturing precision.
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 solution prevents curling and enhances handleability, allowing for stable performance under pressure conditions and improved water production efficiency.
Implementation Method 1
the permeate-side channel member includes a composition containing at least a high-crystalline polypropylene (A) and satisfies the following requirements (a) and (b): (a) a content of the high-crystalline polypropylene (A) in the composition is from 40 to 95% by weight; and (b) the permeate-side channel member has a melting endothermic energy amount (ΔH) of from 20 to 70 J/g
Data Source
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AI summary
The present invention provides a separation membrane and a separation membrane element which are capable of exhibiting good water production performance and excellent in handleability and process passage. A separation membrane of the present invention is a separation membrane including: a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member adhered to the permeate-side face of the separation membrane main body, in which the permeate-side channel member includes a composition containing at least a high-crystalline polypropylene (A) and satisfies the following requirements (a) and (b): (a) a content of the high-crystalline polypropylene (A) in the composition is from 40 to 95% by weight; and (b) the permeate-side channel member has a melting endothermic energy amount (ΔH) of from 20 to 70 J/g.