Seawater degradation material with adjustable use cycle and degradation cycle and preparation method of seawater degradation material

Abstract

The invention discloses a seawater degradation material with an adjustable use cycle and degradation cycle and a preparation method of the seawater degradation material. The seawater degradation material with the adjustable use cycle and degradation cycle is prepared from the following raw materials in parts by weight: 8-9 parts of thermoplasticity modified polyvinyl alcohol, 8-90 parts of a polyester and 0-2 parts of a solvent. The preparation method of the seawater degradation material comprises the following steps: 1) carrying out thermoplasticity modification on polyvinyl alcohol, namely uniformly mixing polyvinyl alcohol with a plasticizer, and carrying out sealed plasticization and extrusion pelletizing; 2) preparing the seawater degradation material, namely uniformly mixing the thermoplasticity modified polyvinyl alcohol, the polyester and the solvent, and carrying out extrusion pelletizing and injection molding, thereby obtaining the seawater degradation material with the adjustable use cycle and degradation cycle. The seawater degradation material disclosed by the invention is a PVA (Polyvinyl Alcohol) composite material which is prepared through melting and commixing, issimple and controllable in process and low in energy consumption, and problems that a conventional process based on a PVA solution is high in cost and low in efficiency are effectively overcome.

Description

technical field [0001] The invention relates to the technical field of seawater purification. More specifically, it relates to a seawater degradable material with adjustable use period and degradation period and a preparation method thereof. Background technique [0002] In recent years, the world has used no less than 240 million tons of plastics and their products every year. It is conservatively estimated that 4.8-12.7 million tons of plastic waste is directly discarded or enters the ocean from land through rivers and wind, and is transported by ocean currents. Widely present in the whole marine ecosystem. These plastic wastes are affected by solar radiation (such as photodegradation, embrittlement), weathering, wave mechanical force, and biota, and finally form tiny plastic fragments or particles, which can be defined as "microplastics" when the diameter is less than 5mm. . From large-volume plastic products to microplastics, they all exist in solid form and are diffi...

AI Technical Summary

Problems solved by technology

For example, CN 106589852A discloses a water-degradable material with adjustable degradation cycle, but it is not advisable to use polyvinyl alcohol as a hydrolysis accelerator to melt and extrude directly with aliphatic polyester and auxiliary agents, because it is not thermoplastically modified PVA is not only difficult to process thermoplastically, the product is easy to decompose, the use of mechanical properties is lost, and it does not have good water solubility

It is also worth noting that although PVA can be completely biodegraded, its degradation has higher requirements on the degradation environment. Soil and river water are very few, and it is basically certain that although the water solubility of PVA can make it dissolve in seawater and thus promote biodegradation, the degradation rate of PVA is relatively slow

At the same time, when PVA is used as a product material, it shows the defect of poor water resistance.

How to overcome the poor water resistance of PVA while ensuring the water solubility of PVA is a challenging technical problem

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