Method for recycling polyvinylidene fluoride plastic

Abstract

The invention relates to the technical field of novel functional materials, and discloses a method for recycling polyvinylidene fluoride plastic. The method comprises the steps of mixing a prepared composite additive with crushed polyvinylidene fluoride waste plastic particles, adding a coupling agent, and performing extruding and granulating by virtue of a double-screw extruder, wherein the prepared composite additive is subjected to melt blending with polyvinylidene fluoride waste plastic, so that high compatibility is achieved, and the compactness and uniformity of the structure are improved; the composite additive is of a multi-metal organic compound structure, so that the crystallization area is reduced when the composite additive is in combination with polyvinylidene fluoride, the occurrence of a photooxidation reaction can be inhibited, and the tensile strength and the high temperature resistance are improved; meanwhile, the light resistance, the low temperature resistance and the thermal stability of the polyvinylidene fluoride molecules are improved, the problem that the waste polyvinylidene fluoride plastic is seriously aged, and the performance of the prepared plastic product is reduced is solved; and the quality problems such as surface defects caused by adding of a filler and the like are eliminated, and the low temperature resistance and the flexibility of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, and in particular relates to a method for recycling polyvinylidene fluoride plastics. Background technique [0002] Polyvinylidene fluoride (PVDF) is a semi-crystalline polymer under normal conditions, with a crystallinity of about 50%. So far, five crystal forms, α, β, γ, δ and ε, have been reported, which are formed under different conditions and can be transformed into each other under certain conditions (effects of heat, electric field, mechanical and radiation energy). Among the five crystal forms, the β crystal form is the most important, and PVDF used as piezoelectric and pyroelectric applications mainly contains the β crystal form. White powdery crystalline polymer, density 1.75-1.78g / cm3. The glass transition temperature is -39°C, the embrittlement temperature is -62°C, the melting point is 170°C, the thermal decomposition temperature is about 350°C, and the long-term ...

AI Technical Summary

Problems solved by technology

[0003] As the demand for polyvinylidene fluoride plastics is gradually increasing, a large amount of waste polyvinylidene fluoride plastics has to be produced, and the price of polyvinylidene fluoride is relatively expensive. As people become more and more aware of environmental protection The stronger it is, the recycling and reuse of waste plastics has also become a new industry; the current common problem is that waste polyvinylidene fluoride itself is difficult to degrade, and there are harmful halogen components. During the regeneration process, due to the poor bonding performance of the material, The performance of recycled plastic products is generally poor, and its original weather resistance, UV resistance, chemical stability and mechanical properties are greatly reduced. The existing methods are mainly by increasing the proportion of new plastic materials and adding traffic. However, the performance of recycled plastics has not been significantly improved, and at the same time, it has caused new resource consumption and low recycling rates.

Images