Liquid Repellent Layer Forming Resin Composition
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Solution Overview
Problem
Conventional polyolefin resin-based packaging materials with added silicone particles for liquid repellency suffer from particle aggregation and separation, leading to insufficient prevention of content adhesion to the inner surface, resulting in residual liquids and stains.
Innovation Solution
A liquid-repellent layer forming resin composition comprising a polypropylene resin blend of random and block polypropylene resins with a specific mass ratio, combined with a silylated polyolefin, which controls crystallinity and Si precipitation to enhance liquid repellency, and optionally includes a compatibilizer and silicone for improved dispersibility and surface abundance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone particles are added to polyolefin resin to impart liquid repellency, then liquid repellency is improved, but particle aggregation and separation occur leading to insufficient prevention of content adhesion
Solution Approach 1:
The patent introduces silylated polyolefin as an intermediary substance between the polyolefin resin and silicone particles. The silylated polyolefin contains both polyolefin groups (compatible with the resin matrix) and silyl groups (compatible with silicone particles), acting as a compatibilizer that improves particle dispersion stability and prevents aggregation while maintaining liquid repellency
Solution Approach 2:
The patent creates a composite material system consisting of polyolefin resin, silylated polyolefin, and silicone particles. This composite structure leverages the complementary properties of each component: the polyolefin resin provides the base matrix, the silylated polyolefin provides interfacial compatibility, and the silicone particles provide liquid repellency, achieving both improved reliability and compositional stability
2Strength
If polypropylene resin is used for heat sealability and impact resistance, then mechanical properties are improved, but oil swelling occurs reducing liquid repellency effectiveness
Solution Approach 1:
The patent modifies the polypropylene resin by incorporating silylated polyolefin, which changes the chemical composition and reduces oil swelling. This parameter change allows the material to maintain its mechanical strength while improving liquid repellency effectiveness by reducing oil absorption into the resin matrix
3Reliability
If silylated polyolefin is used to improve Si surface abundance, then liquid repellency is improved, but compatibility with polypropylene resin decreases causing separation
Solution Approach 1:
The silylated polyolefin acts as a mediator with dual compatibility: its polyolefin portion interacts with the polypropylene resin matrix while its silyl portion interacts with silicone and migrates to the surface. This intermediary structure enables both good resin compatibility and high Si surface abundance, resolving the contradiction between homogeneity and liquid repellency
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 composition effectively prevents content adhesion by reducing oil swelling and increasing Si abundance on the surface, achieving superior liquid repellency against water and oil-based contents, including those with oil dispersed in water.
Implementation Method 1
the degree of precipitation of Si in the silylated polyolefin (B) on the surface of a liquid-repellent layer can be also controlled
Implementation Method 2
the crystallinity and melting point of the PP are controlled, so that the amount of oil swelling can be controlled
Data Source
Figure 1
Figure 2
Figure 3(a)~3(e)
AI summary
A liquid-repellent layer forming resin composition comprises a polypropylene resin (A) and a silylated polyolefin (B), wherein the polypropylene resin (A) comprises a random polypropylene resin (A1) and a block polypropylene resin (A2) with a mass ratio (Mass of random polypropylene resin (A1)/Mass of block polypropylene resin (A2)) in the range of 20/80 to 80/20.