Olefin Resin Composition UV Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin compositions used in automobile exterior materials and household electric appliances face deterioration due to UV radiation and high temperatures, with hindered amine compounds and ultraviolet absorbers having poor compatibility with resins, leading to bleeding and impaired weather resistance, especially when added in large amounts, which also increases costs and affects initial coloration.
Innovation Solution
An olefin-based resin composition comprising a hindered amine-based light stabilizer, a specific benzoate compound, and a benzotriazole-based ultraviolet absorber at specific ratios, along with optional additives like transparentizing agents, pigments, and fillers, to enhance weather resistance while minimizing bleeding and initial coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of hindered amine compound or ultraviolet absorber is added to improve weather resistance, then weather resistance is improved, but the additives bleed out to the resin surface impairing outer appearance and initial coloration
Solution Approach 1:
The invention changes the chemical structure parameters of the ultraviolet absorber by introducing specific substituents (tert-butyl, chloro, fluoro groups) at defined positions on the benzotriazole ring. This structural modification enables the additive to achieve sufficient weather resistance protection at lower concentrations (0.01-5 parts by mass per 100 parts resin), preventing bleeding and blooming while maintaining effectiveness.
Solution Approach 2:
The invention creates a composite stabilization system combining hindered amine compounds (0.05-0.5 parts by mass) with specifically modified benzotriazole-based ultraviolet absorbers (0.01-5 parts by mass). This composite approach synergistically improves weather resistance while reducing individual additive concentrations, thereby preventing surface bleeding and blooming that occur with higher doses of single additives.
2Reliability
If conventional ultraviolet absorbers are used in combination to broaden absorption wavelength range, then stabilization effect is improved, but the components must be incorporated in large amounts (not less than 0.05 parts by mass each) causing bleeding
Solution Approach 1:
The invention modifies the ultraviolet absorption parameters by strategically placing electron-donating (tert-butyl) and electron-withdrawing (chloro, fluoro) groups at specific positions on the benzotriazole ring. This extends the absorption wavelength range while maintaining high absorption efficiency, allowing effective stabilization at lower concentrations (0.01-5 parts by mass) compared to conventional absorbers requiring at least 0.05 parts by mass each.
3Reliability
If benzotriazole-based ultraviolet absorber is added in large amount to improve weather resistance, then weather resistance is improved, but initial coloration is impaired
Solution Approach 1:
The invention optimizes the chemical structure parameters of the benzotriazole-based absorber by introducing specific substituents that extend UV absorption while minimizing visible light absorption. This selective wavelength targeting provides effective weather resistance protection without causing initial coloration, enabling use at lower concentrations (0.01-5 parts by mass) that further reduce coloration risk.
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 resin composition achieves excellent weather resistance with suppressed bleeding and initial coloration, even with a small addition of stabilization components, maintaining surface gloss and preventing blooming, thus improving durability and aesthetic appeal.
Implementation Method 1
a benzotriazole-based ultraviolet absorber represented by the following Formula (2)... (D) a benzotriazole-based ultraviolet absorber
Implementation Method 2
a hindered amine-based light stabilizer... (B) a hindered amine-based light stabilizer
Data Source
AI summary
Provided is a resin composition having excellent weather resistance, in which occurrence of initial coloration, bleeding and blooming is suppressed. The resin composition is characterized by comprising, with respect to 100 parts by mass of (A) an olefin-based resin: 0.05 to 0.3 parts by mass of (B) a hindered amine-based light stabilizer; 0.05 to 0.3 parts by mass of (C) a benzoate compound represented by the following Formula (1); and 0.001 to 0.01 parts by mass of (D) a benzotriazole-based ultraviolet absorber represented by the following Formula (2): (wherein, R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or the like; and R3 represents an alkyl group having 8 to 30 carbon atoms) (wherein, R4 and R5 each independently represent, for example, a hydrogen atom; R6 and R7 each independently represent a hydrogen atom or an alkyl group having 1 to 18 carbon atoms; R8 and R9 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms).