Polyamide Molding Compound UV Stabilization
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Solution Overview
Problem
Existing polyamide molding compounds used in electrical and electronic components suffer from significant yellowing when exposed to radiation and temperature, leading to increased yellow indices, which affects their performance and appearance.
Innovation Solution
A polyamide molding compound is developed that incorporates a combination of N,N'-oxamides and hydroxyphenyltriazines as UV absorbers, along with other UV stabilizers, to enhance its resistance to yellowing, maintaining a low yellow index even after radiation and temperature treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional UV absorbers (dibenzoylmethane compounds or aminohydroxybenzoylbenzoic acid esters) are used in polyamide molding compounds, then light transmission is reduced up to 400 nm, but significant yellowing occurs after radiation and temperature treatment
Solution Approach 1:
The patent combines N,N'-oxamides and hydroxyphenyltriazines as UV absorbers in a synergistic mixture within the polyamide molding compound. This combination creates a complementary UV absorption spectrum where oxamides absorb in the UV-B range (280-320 nm) and hydroxyphenyltriazines absorb in the UV-A range (320-400 nm), providing comprehensive UV protection and preventing yellowing across the entire UV spectrum.
Solution Approach 2:
The invention uses a composite UV stabilization system comprising multiple UV absorber compounds (N,N'-oxamides and hydroxyphenyltriazines) working together in the polyamide matrix. This composite approach creates a multi-functional protection system that addresses the limitations of single UV absorber types by combining different absorption mechanisms and spectral coverage.
2Object-affected harmful factors
If UV absorbers are added to polyamide molding compounds to prevent yellowing, then color stability improves, but the complexity of the material composition increases
Solution Approach 1:
The patent optimizes the concentration parameters of the UV absorbers within specific ranges: N,N'-oxamides are used at 0.01-5 wt% and hydroxyphenyltriazines at 0.01-3 wt% of the total molding compound. These parameter optimizations ensure effective UV protection while maintaining manageable material composition complexity and avoiding excessive additive levels.
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 compound achieves a very low original yellow index and shows minimal increase after 12 cycles of radiation and temperature treatment, maintaining color stability and performance.
Implementation Method 1
The invention relates to a polyamide molding compound which contains a partially aromatic polyamide and a mixture of at least two UV absorbers... at least one UV absorber from the group of N,N'-oxamides and at least one UV absorber from the group of hydroxyphenyltriazines
Data Source
AI summary
The invention relates to a polyamide molding compound containing a partially aromatic polyamide and a mixture of at least two UV absorbers. The invention also relates to molded bodies containing corresponding polyamide molding compounds.The polyamide molding compounds according to the invention are used as parts of electrical or electronic components or housings or housing components, in particular housings or housing parts for portable electronic devices, household appliances, household machines, devices and apparatus for telecommunications and consumer electronics, interior and exterior parts in the automotive sector and in the field of other means of transport, interior and exterior parts, preferably with load-bearing or mechanical function in the fields of electrical engineering, furniture, sports, mechanical engineering, sanitary and hygiene, medicine, energy and drive technology, in particular preferably mobile phones, smartphones, organizers, laptop computers, notebook computers, tablet computers, radios, cameras, watches, calculators, playback devices for music or video, navigation devices, GPS devices, electronic picture frames, external hard drives and other electronic storage media or for the production of mono- or multi-layer films, containers or tubes.