ABS Resin Composition for Vibration Welding PMMA Rear Lamp Lenses
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Solution Overview
Problem
Current thermoplastic resin compositions used in automotive rear lamp manufacturing face challenges with vibration weldability, leading to non-fusion defects and increased productivity costs, particularly when using ABS-based resins with ABS-based lamp housings and PMMA lenses, as existing methods like thermal welding result in poor appearance and low productivity, while laser welding is economically inefficient.
Innovation Solution
A thermoplastic resin composition comprising 20-30% ABS-based graft copolymer with conjugated diene-based rubber polymers of specific particle diameters, 2-10% rubber-modified graft copolymer, and 65-75% heat-resistant styrene-based matrix resin, optimized for improved vibration weldability and heat resistance, allowing for efficient bonding with PMMA lenses using vibration welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vibration welding method is used to couple ABS-based lamp housing with PMMA lens, then productivity and appearance are improved, but non-fusion defects occur and debris is generated requiring additional removal processes
Solution Approach 1:
The patent modifies the chemical composition parameters of the ABS-based resin by incorporating specific rubber polymers (polybutadiene with 10-30% content and polyisoprene with 5-20% content) and controlling the graft copolymer structure. These parameter changes in resin composition improve the weldability and reduce non-fusion defects during vibration welding, enabling high-quality welding without additional debris removal processes.
Solution Approach 2:
The patent creates a composite resin system combining ABS-based graft copolymer with specific rubber polymers (polybutadiene and polyisoprene) in controlled ratios. This composite material structure enhances the resin's vibration welding properties by combining the advantages of different polymer components, achieving both high productivity and defect-free weld quality when coupling ABS lamp housings with PMMA lenses.
2Manufacturing precision
If laser welding method is used to address debris problems, then weld quality is improved, but device cost increases significantly
Solution Approach 1:
The patent employs a cost-effective vibration welding process instead of expensive laser welding equipment. By modifying the resin composition to be inherently suitable for vibration welding, the patent eliminates the need for costly laser welding devices while achieving comparable or superior weld quality, thereby reducing device investment and operational costs.
Solution Approach 2:
The patent changes the material parameters of the ABS-based resin to optimize it for vibration welding rather than laser welding. By adjusting the rubber polymer content and graft copolymer structure, the resin becomes highly compatible with vibration welding processes, allowing the use of simpler, less expensive welding equipment while maintaining high weld quality standards.
3Device complexity
If thermal welding method is used to couple lamp housing with lens, then apparatus cost is reduced, but appearance quality and productivity deteriorate
Solution Approach 1:
The patent modifies the resin's thermal and mechanical parameters through controlled incorporation of rubber polymers and graft copolymers. These parameter changes enable the material to be processed more efficiently with simplified welding apparatus while simultaneously improving productivity and appearance quality, overcoming the limitations of conventional thermal welding methods.
Solution Approach 2:
The patent uses a composite resin system that combines ABS-based graft copolymer with specific rubber polymers to create a material that can be welded using simple, low-cost apparatus. The composite structure provides optimal thermal and mechanical properties for efficient welding, achieving high productivity and excellent appearance quality without requiring complex welding equipment.
4Manufacturing precision
If vibration time is increased to address non-fusion phenomenon, then weld completeness is improved, but debris generation increases causing defects
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific ratios of rubber polymers and graft copolymers. These parameter changes improve the material's flow and fusion characteristics during vibration welding, achieving complete weld fusion at optimal vibration times without generating excessive debris that would require additional removal processes.
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 enhances vibration weldability, reduces manufacturing defects, and increases productivity while maintaining mechanical strength and heat resistance, thereby lowering costs and improving product quality in automotive rear lamp production.
Implementation Method 1
a vibration welding method is favored in consideration of appearance and productivity
Implementation Method 2
a thermal welding method, in which apparatus cost is low, was mainly used in the past
Data Source
AI summary
The present invention relates to a thermoplastic resin composition, a method of preparing the same, and an injection-molded article including the same. More particularly, the present invention relates to a thermoplastic resin composition having superior vibration welding properties along with ABS-based resin-specific impact resistance, heat resistance, and the like due to inclusion of an ABS-based graft copolymer including a conjugated diene-based rubber polymer having an average particle diameter of 0.25 to 0.35 µm; a rubber-modified graft copolymer including a diene-based rubber polymer having an average particle diameter of 0.6 to 10 µm and prepared by continuous bulk polymerization; and a matrix resin, and an injection-molded article including the thermoplastic resin composition.