Stabilizer Mixture for Agrochemical-Resistant Polyolefins

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Solution Overview

Problem

Organic materials, particularly polyolefins, are prone to degradation due to light, heat, oxidation, and the effects of agrochemical compounds, leading to reduced mechanical properties and stability in applications such as greenhouse film covers.

Innovation Solution

A stabilizer mixture comprising sterically hindered amine light stabilizers, triazine UV absorbers, and benzophenone UV absorbers is incorporated into organic materials to enhance their resistance to degradation, with specific compounds and weight ratios optimizing the protective effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If organic materials are used in applications exposed to light, heat, and agrochemical compounds, then the materials provide functional performance, but they undergo degradation leading to reduced mechanical properties

Engineering Contradiction:

ImprovestabilityVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies preliminary action by incorporating stabilizer mixtures (containing UV absorbers, HALS, and antioxidants) into the organic material before it is exposed to degrading environmental conditions. This preventive approach ensures the material is pre-protected against light, heat, and oxidation, maintaining mechanical properties throughout its service life in applications like greenhouse films.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If stabilizer mixtures are added to protect organic materials from degradation, then resistance to light and oxidation is improved, but the complexity of the composition increases

Engineering Contradiction:

Improveresistance to degradationVSAvoidcomposition complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges multiple protective functions into a single stabilizer mixture formulation. It combines UV absorbers (benzophenone derivatives), HALS (sterically hindered amines), and antioxidants into one integrated system that simultaneously protects against light degradation, thermal oxidation, and agrochemical effects, simplifying the overall protection approach while maintaining comprehensive coverage.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses composite material principles by creating a multi-component stabilizer system where different additives work synergistically. The specific combination of UV absorbers, HALS, and antioxidants forms a composite protective package that addresses multiple degradation mechanisms simultaneously, enhancing overall stability without requiring separate protection systems for each threat.

Inventive Principle:

Principle #40Composite materials

3Duration of action of stationary object

If conventional single stabilizers are used, then the composition remains simple, but the retention of mechanical properties under accelerated weathering is insufficient

Engineering Contradiction:

Improveservice lifeVSAvoidmechanical property retention

Core Design Contradiction:

Duration of action of stationary objectVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by optimizing the specific composition ratios and chemical structures within the stabilizer mixture. It uses particular benzophenone derivatives with specific molecular weights and substitution patterns, combined with specific HALS structures, to achieve enhanced protection that extends service life while maintaining mechanical properties under accelerated weathering conditions better than conventional single stabilizers.

Inventive Principle:

Principle #35Parameter changes

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 stabilizer mixture significantly improves the retention of mechanical properties and resistance to degradation, maintaining elongation at break and tensile strength even after exposure to agrochemicals and accelerated light weathering, making it suitable for long-term use in agricultural films.

Implementation Method 1

component (b) is at least one compound selected from the formulae (B-I) and (B-II)... component (c) is a compound of formula (C)... triazine UV absorber and benzophenone UV absorbers

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 2

component (a) is at least one compound of the formula (A)... sterically hindered amine light stabilizer... subject to degradation induced by light, heat, oxidation

Methodology Applied

Scientific EffectPhoto-induced radical scavenging: Photo-oxidation

Data Source

PatentUS20230102449A1Light stabilizer mixture

Publication Date: 2023.03.30 BASF SE

AI summary

A stabilizer mixture comprising a sterically hindered amine light stabilizer, a triazine UV absorber and a benzophenone UV absorber.