Laser-Marking Polyester Resin Composition With Strength Retention
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Solution Overview
Problem
Existing resin compositions for laser marking on thermoplastic resins face challenges in achieving high mechanical strength and sharp contrast laser marking properties, particularly when incorporating non-toxic additives like titanium dioxide and non-halogen-based flame retardants, which often degrade mechanical characteristics.
Innovation Solution
A resin composition comprising 20-80% polyester resin, 10-50% glass fibers, and 0.1-10% fibrous potassium titanate, with optional non-halogen-based flame retardants, maintains high mechanical strength and sharp laser marking properties without using toxic substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium dioxide and reducing agent are blended to achieve laser marking properties, then laser marking contrast is improved, but mechanical characteristics are degraded
Solution Approach 1:
The patent changes the chemical composition parameters by replacing titanium dioxide with potassium titanate and adjusting the ratio of polyester resins (polybutylene terephthalate and polyethylene terephthalate) to achieve both laser marking contrast and mechanical strength requirements
Solution Approach 2:
The patent uses a composite resin system combining polybutylene terephthalate and polyethylene terephthalate with potassium titanate and glass fibers to achieve synergistic effects that simultaneously provide laser marking properties and mechanical strength
2Object-affected harmful factors
If non-halogen-based flame retardant is blended to achieve flame retardancy, then safety is improved, but mechanical characteristics are further lowered
Solution Approach 1:
The patent optimizes the content ratio of polybutylene terephthalate to polyethylene terephthalate and controls the amount of potassium titanate and glass fibers to maintain mechanical strength even when flame retardants are added to the composition
3Strength
If glass fibers are blended to achieve reinforcement, then mechanical strength is improved, but laser marking properties are degraded
Solution Approach 1:
The patent controls the content of glass fibers within specific ranges (5-30 mass%) and balances it with potassium titanate content and polyester resin ratios to maintain both mechanical strength and laser marking contrast
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 high bending strength of 165 MPa or more, maintains mechanical characteristics with non-halogen-based flame retardants, and provides sharp-contrast laser markings suitable for electrical, electronic, and automobile parts.
Implementation Method 1
the resin needs to absorb laser light. Laser light absorption properties depend on the chemical structure of the resin composition or the wavelength of the laser used
Implementation Method 2
a thermoplastic resin product can absorb energy from laser light applied and convert this energy into heat, and thereby can induce a color-changing reaction (that is, marking) on a material
Data Source
AI summary
The present invention provides a resin composition for laser marking which has high strength and high rigidity, but still gives a character, a symbol, and the like with sharp contrast, and has excellent laser marking properties on an electrical or electronic part, a mechanical part, an automobile part, and the like. A resin composition for laser marking which contains 20 to 80 mass % of a polyester resin (A), 10 to 50 mass % of glass fibers (B), and 0.1 to 10 mass % of potassium titanate (C). The polyester resin (A) is preferably polybutylene terephthalate or polyethylene terephthalate.