Polypropylene Composite with Silane Coupling Agent
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Solution Overview
Problem
Polypropylene is incompatible with glass bubbles, leading to deterioration of mechanical properties such as IZOD impact strength, flexural modulus, and tensile strength in composite materials, limiting their practical use for weight reduction in automotive components.
Innovation Solution
A polypropylene composite composition comprising 50-80% polypropylene, 6-30% talc, 10-30% rubber, and 3-15% glass bubbles, with a coupling agent represented by a specific compound that improves compatibility between polypropylene and glass bubbles, enhancing mechanical properties and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If glass bubbles are used as fillers in polypropylene composites for weight reduction, then the specific gravity and weight of the composite are reduced, but the mechanical properties (tensile strength, flexural modulus, IZOD impact strength) deteriorate due to incompatibility between polypropylene and glass bubbles
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between polypropylene and glass bubbles. The coupling agent contains both organic functional groups that bond with polypropylene and inorganic functional groups that bond with glass bubbles, creating a bridge that improves interfacial adhesion and compatibility, thereby resolving the mechanical property deterioration while maintaining weight reduction benefits
Solution Approach 2:
The patent creates a multi-component composite system consisting of polypropylene matrix, glass bubble fillers, silane coupling agent, and auxiliary additives. This composite approach allows the system to simultaneously achieve weight reduction from glass bubbles and mechanical property enhancement through proper material selection and formulation
2Weight of moving object
If glass bubbles replace traditional fillers like talc and glass fibers, then weight reduction is achieved, but the compatibility and adhesion between filler and polypropylene matrix deteriorate
Solution Approach 1:
The silane coupling agent serves as a mediator that chemically bridges the organic polypropylene matrix and inorganic glass bubbles. The coupling agent's dual functionality - organic groups bonding with polypropylene and inorganic groups bonding with glass surfaces - eliminates incompatibility issues and improves interfacial adhesion
Solution Approach 2:
The patent modifies the surface properties of glass bubbles through silane treatment, changing their chemical parameters to be more compatible with polypropylene. This parameter change in surface chemistry enables better dispersion and adhesion of glass bubbles in the polypropylene matrix
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 achieves improved mechanical properties, including increased tensile strength and flexural modulus, while reducing weight and simplifying production by enhancing paint adhesion and eliminating the need for additional processing steps, thus facilitating the use of glass bubbles as effective fillers in polypropylene composites for automotive components.
Implementation Method 1
a coupling agent which is a compound represented by formula (1)... improvement of compatibility between polypropylene and glass bubbles... enhancing mechanical properties and adhesion
Data Source
AI summary
Disclosed herein is a polypropylene composite composition. The polypropylene composite composition comprises 50 to 80% by weight of polypropylene, 6 to 30% by weight of talc, 10 to 30% by weight of a rubber, 3 to 15% by weight of glass bubbles, and 0.5 to 7% by weight of a coupling agent wherein the coupling agent is a compound represented by Formula 1 below:wherein n is an integer from 1 to 500.According to the composition, the compatibility between the glass bubbles and the polypropylene can be improved, thus enabling effective use of the glass bubbles. Therefore, when the composition is used to produce automotive components, such as automotive interior components, the fuel efficiency of automobiles can be improved due to weight reduction effects of polypropylene composites. In addition, since the composition uses colorless and odorless glass bubbles, it can remove an unpleasant smell generated from conventional interior components using talc and is thus environmentally friendly.Furthermore, since glass bubbles used in the composition offer surface embossing effects, the adhesiveness of polyurethane foams is improved and thus the production of automotive components can be simplified.