Dual-degradant additive for promoting photo oxidative degradation and biodegradation of polymer

Abstract

The invention relates to a dual-degradant additive for promoting photo oxidative degradation and biodegradation of a polymer, comprising the following ingredients: 30-50 wt% of resin used as a carrier, 26-40 wt% of composite photo oxidative degradation accelerating agent, 1-5 wt% of photo oxidative degradation induction period regulator, 1-5 wt% of carboxylic acid or its derivative, and 15-25 wt%of microcapsule composite material. The dual-degradant additive disclosed herein can be applied on various polymers. By using the dual-degradant additive to mix with the polymer according to a certain proportion to prepare a composite material, the composite material can be degraded through photo oxidative degradation and biodegradation, has effects of repairing soil and compost, and has effects of oxygen barrier and flame resistance in many applications.

Description

technical field [0001] The invention relates to an environment-friendly degradation additive for polymers, in particular to a dual degradation additive for promoting photooxidative degradation and biodegradation of polymers. Background technique [0002] Regarding photooxidative degradation: it is the combined effect of the two degradation effects of light and oxygen. Its working mechanism is that the polymer containing the photooxidative degradation accelerator triggers a dehydrogenation reaction under the action of light, and transfers energy to the polymer molecule, causing it to undergo chain scission and crosslinking, that is, a photocatalytic degradation reaction occurs. This process often Accompanied by the generation of oxygen-containing functional groups (such as carboxyl, hydroxyl, carbonyl, etc.), the polymer is further oxidatively degraded. Polymers containing photooxidative degradation accelerators are called photooxidative degradation polymers. [0003] Regar...

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Problems solved by technology

[0016] (1) Biodegradable natural polymers are often not comparable to petroleum-based materials in terms of physical and mechanical properties, processing properties, and application costs. These shortcomings have greatly affected their application and promotion;

[0017] (2) Biodegradable materials, mainly biodegradable materials (such as starch) as additives and polymer blended composite materials, the working principle is mainly because the additives are destroyed and the polymer chain is weakened, so that The molecular weight of the polymer is degraded to the extent that microorganisms can digest it, and finally decomposed into carbon dioxide (CO2) and water. The disadvantage of this material is that it needs to add a large amount of additives to achieve the desired degradation effect, which will lead to the loss of physical and mechanical properties; at the same time, in addition to additives In addition to being able to degrade, a large amount of remaining polymers will still remain and cannot be completely biodegraded, but only decompose into fragments, which cannot be recycled, and the situation is even worse after entering the soil, causing confusion to the disposal of waste;

[0018] (3) Photooxidative degradation depends on light and aerobic environment, so in the absence of light and / or oxygen, the degradation effect will be greatly affected, so it has relative limitations, and its application is also subject to corresponding restrictions ;

[0019] (4) Simple photo-oxidative degradation can easily cause material brittle cracks and form brittle chips. In the absence of biodegradation, it is difficult to completely degrade or the time required for final complete degradation is very long

In addition, many photo-oxidative degradation additives often contain toxic heavy metal residues, and the resulting secondary pollution is not friendly to the environment;

[0020] (5) Simple photo-oxidative degradation materials often do not have the effect of composting;

[0021] (6) Low degradation efficiency caused by simple biodegradation mode

Especially in the application of agricultural film, it is necessary to meet the cycle arrangement of crop production, such as 2-12 months, and if biodegradable synthetic polymers rely on a simple biodegradation mode, under the premise that the amount of additives remains unchanged , its degradation cycle often takes more than 24 months, so it does not meet the requirements;

[0022] (7) Many degradable polymers can only be used for disposable products with a short use time due to the inherent short degradation cycle of the material itself, such as lunch boxes, disposable plastic cups, food packaging films, agricultural films or garbage Bags and other occasions, but cannot meet the requirements of durable use, that is, it does not have degradation controllability;

[0025] It can be seen that, before the present invention, there have been no reports of related patents and documents that can solve the above-mentioned 9 aspects of the problem at the same time.

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