Use of beta-diketone-rare earth complex as light stabilizer

Abstract

The invention provides the use of beta-diketone-rare earth complex as light stabilizer for macromolecular material, wherein the complex has a general formula of REL3-x(OH)x*mH2O, wherein RE is one of Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, or the combination of some of them by any proportion, or the mixed rare earth mainly containing these elements, L is anion of beta-diketone, x=0-2, m=0-3. The light stabilizer has good light stabilization efficacy and heat-durability.

Description

technical field [0001] The invention relates to an organic macromolecular light stabilizer, in particular to the application of a class of β-diketone-rare earth complexes as light stabilizers. Background technique [0002] Most organic polymer materials, including plastics, chemical fibers, rubber, coatings, paints, adhesives, etc., will undergo photodegradation reactions and age when exposed to sunlight, manifested as discoloration, loss of luster, silver streaks, erosion, and cracks As well as deterioration of appearance and physical and mechanical properties such as tensile strength, impact strength, elongation and electrical properties. Therefore, organic polymer materials used outdoors must be treated with light stabilization, and some polymers that are particularly sensitive to ultraviolet light, such as polypropylene, and even products for indoor applications also need to be treated. The photoaging of organic polymer materials can be suppressed by adding light stabil...

AI Technical Summary

Problems solved by technology

It is a pity that they all have their own shortcomings: the light shielding agent has good protective effect and low price, but it has light-shielding properties and is only suitable for opaque materials; At the same time, because it is a pure organic compound, it also has disadvantages such as volatile, blooming, migration, and extraction, which not only affects the durability of its performance, but also causes pollution to the environment; the excited state quencher has high photostability and is volatile. Low resistance, low blooming and migration, and resistance to extraction, but deep color, high toxicity and environmental pollution, will decompose and change color during high temperature processing, and have an antagonistic effect on sulfur-containing additives; free radical scavenger has light color and high photostability, but Because of its alkalinity, it has antagonism with acidic substrates, additives and environmental substances, and like ultraviolet absorbers, because it is a pure organic compound, it also has disadvantages such as volatilization, blooming, migration, extraction, etc.

However, this has further increased the difficulty of implementing these modification technologies, which already involve a relatively complex synthesis process, and increased the cost, and it is difficult to control the stability of product performance.

It may be because of these deficiencies that the comprehensive technical and economic performance improvements achieved by these organic and polymer chemical modifications are not satisfactory in many cases. Therefore, although there are many patents published (according to statistics, between 1977 and 1996, There are more than 1,100 patents on hindered amine light stabilizers), but there are not many achievements in industrialized production and better promotion and application (the more successful ones are several high molecular weight hindered amines, such as Tinuvin 622, Chimassorb 944 and Cyasorb UV -3346)

Images