Carbon-Modified Polystyrene Resin Particles for Balanced Rigidity and Chemical Resistance
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Solution Overview
Problem
Conventional polystyrene and polypropylene type resin foamed molded products face challenges in achieving a balance of chemical resistance, heat resistance, foam moldability, and self-extinguishing properties while maintaining favorable levels of rigidity and blackness, particularly in applications requiring these combined properties.
Innovation Solution
A carbon-containing modified polystyrene type resin particle is developed, comprising a carbon-containing polypropylene type resin and polystyrene, with a specific ratio of polystyrene in the central part and polypropylene near the surface, impregnated with a foaming agent and flame retardants, to create a foamed molded product that exhibits excellent rigidity, foam moldability, chemical resistance, heat resistance, and self-extinguishing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polystyrene type resin is used for foamed molded products, then rigidity and foam moldability are improved, but chemical resistance and impact resistance deteriorate
Solution Approach 1:
The invention uses a composite resin composition containing both polystyrene type resin and polypropylene type resin in specific proportions (polystyrene 30-80 parts, polypropylene 20-70 parts). This composite structure allows the product to achieve both the rigidity and foam moldability of polystyrene and the chemical resistance and impact resistance of polypropylene, resolving the contradiction between these properties.
2Reliability
If polypropylene type resin is used for foamed molded products, then chemical resistance and impact resistance are improved, but rigidity deteriorates and foaming gas retention is poor
Solution Approach 1:
The composite resin composition combines polypropylene type resin (providing chemical resistance and impact resistance) with polystyrene type resin (providing rigidity and good foaming gas retention). The specific proportion range ensures that the polypropylene component delivers its protective properties while the polystyrene component maintains structural integrity and foamability.
Solution Approach 2:
The invention optimizes the compositional parameters by controlling the ratio of polystyrene to polypropylene within specific ranges (polystyrene 30-80 parts, polypropylene 20-70 parts). This parameter optimization allows the material to simultaneously achieve good rigidity, chemical resistance, and foaming gas retention, resolving the contradictions associated with using polypropylene alone.
3Ease of manufacture
If carbon is added to achieve blackness, then color properties are improved, but polymerization speed deteriorates
Solution Approach 1:
The invention controls the carbon content within specific limits (0.1-5 parts by weight per 100 parts of resin composition) and optimizes the polymerization temperature range (80-120°C). By adjusting these parameters, the patent achieves satisfactory blackness while minimizing the inhibitory effect of carbon on polymerization speed, thus resolving the contradiction between color properties and productivity.
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 carbon-containing modified polystyrene type resin foamed molded product effectively combines the advantages of both polystyrene and polypropylene types, providing enhanced chemical resistance, heat resistance, and self-extinguishing properties, making it suitable for diverse applications including automotive components and thermal insulation.
Implementation Method 1
a radical polymerization initiator (c) per 100 parts by weight of the vinyl type monomer component (b)... polymerizing the vinyl type monomer component (b)
Implementation Method 2
a foamable carbon-containing modified polystyrene type resin particle obtained by impregnating the carbon-containing modified polystyrene type resin particle with a foaming agent, a carbon-containing modified polystyrene type resin foamed particle obtained by pre-foaming the foamable particle
Implementation Method 3
carbon is well known as a black colorant in such cases
Data Source
Figure 1
AI summary
A carbon-containing modified polystyrene type resin particle of the present invention includes: a carbon-containing polypropylene type resin, and a polystyrene type resin in an amount of not less than 100 parts by weight but less than 400 parts by weight per 100 parts by weight of the carbon-containing polypropylene type resin, wherein the polystyrene type resin ratio at the central part of the particle is at least 1.2 times the polystyrene type resin ratio of the overall particle, the polystyrene type resin ratio being calculated by using the ratio (D698/D1376) of absorbances at 698 cm-1 and 1376 cm-1 which are obtained by infrared absorption spectra measured by ATR infrared spectroscopic analysis.