Polyarylene Sulfide Resin Composition for Laser Welding Transmittance
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Solution Overview
Problem
Polyarylene sulfide resins have low laser beam transmittance due to high optical refractive indices, and this issue is exacerbated by the presence of inorganic fillers, which are commonly used for their mechanical properties.
Innovation Solution
Incorporating specific compounds such as zinc hydroxide, sodium acetate, and zinc carbonate into the polyarylene sulfide resin composition to improve laser beam transmittance, regardless of the resin's molecular weight, and using these additives in conjunction with inorganic fillers to maintain mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyarylene sulfide resin is used for its excellent heat resistance and mechanical properties, then reliability is improved, but laser beam transmittance deteriorates due to high optical refractive index
Solution Approach 1:
An infrared light-transmitting agent is introduced as an intermediary substance to modify the optical properties of the polyarylene sulfide resin. This agent has high laser beam transmittance and acts as a mediator between the resin matrix and the laser beam, allowing the resin to maintain its excellent heat resistance and mechanical properties while improving overall laser beam transmittance of the composition.
Solution Approach 2:
The invention creates a composite resin composition by combining polyarylene sulfide resin with infrared light-transmitting agents. This composite material integrates the heat resistance and mechanical strength of the polyarylene sulfide resin with the high laser beam transmittance of the infrared light-transmitting agent, resolving the contradiction between reliability and laser beam transmittance.
2Strength
If inorganic fillers are added to improve mechanical strength, then strength is improved, but laser beam transmittance further deteriorates due to large difference in optical refractive index
Solution Approach 1:
The invention changes the optical parameters of the resin composition by selecting inorganic fillers with refractive indices closer to that of the polyarylene sulfide resin. Specifically, fillers with refractive indices between 1.6 and 2.0 are chosen to minimize optical contrast and reduce light scattering, thereby maintaining laser beam transmittance while improving mechanical strength.
Solution Approach 2:
The invention applies local quality optimization by carefully selecting inorganic fillers with specific refractive index ranges (1.6-2.0) that match the optical properties of the resin matrix. This localized optimization of filler optical properties ensures that the filler particles do not create significant optical discontinuities, thus maintaining good laser beam transmittance while providing mechanical reinforcement.
Data Source
AI summary
A polyarylene sulfide resin composition that is suitable for laser welding, and a method for producing the same are provided. A method for improving the laser beam transmittance of a molded body containing a polyarylene sulfide resin is also provided. The resin composition for laser welding contains: 100 parts by mass of a polyarylene sulfide resin; and at least 0.03 parts by mass and at most 1.05 parts by mass of a laser beam transmittance improving agent including at least one material selected from the group consisting of potassium hydroxide, sodium hydroxide, sodium acetate, calcium hydroxide, potassium acetate, lithium hydroxide, lithium acetate, zinc hydroxide, zinc acetate, magnesium hydroxide, zinc oxide, zinc carbonate, and zinc carbonate basic.