Biodegradation plastics with high-content of starch for producing tableware and method of producing the same

Abstract

The invention discloses biodegradable plastics which is rich in starch and used to produce dining tools and a preparation method thereof; first, the starch is refined, dried and added in silane coupling agent to be mixed evenly at high speed; and then talc and calcium carbonate are respectively added in to be stirred at medium speed; polypropylene is added in to be stirred at medium speed; and processing aid PE wax, plasticizer EVA and antioxidant DLTP are added in to be stirred at low speed; the materials are mixed and stirred in a cold mixing boiler at low speed, and then added into a three-roll sheet machine to produce sheets. The invention solves the problems of the poor interfacial compatibility and the thermo-plastic performance in the prior art, and is characterized in high content of starch, full biodegradation, sanitation and environmental protection.

Description

1. Technical field [0001] The invention relates to a starch-containing biodegradable plastic and a preparation method thereof, in particular to a high-starch biodegradable plastic used for producing tableware and a preparation method thereof. 2. Background technology [0002] With the rapid development of the economy, people's pace of life is gradually accelerating, and their health awareness is also greatly enhanced. The demand for sanitary disposable tableware is growing rapidly. At present, disposable tableware (including food commercial packaging) on ​​the market mainly includes foamed plastics (mainly expanded polystyrene) and paper products. There are three types of problems in foamed plastic fast tableware: First, foamed plastics need to use a large amount of chemical additives that are harmful to human health in the production process or product formula, and the additives in the production process will endanger environmental sanitation, while A large number of chemi...

AI Technical Summary

Problems solved by technology

There are three types of problems in foamed plastic fast tableware: First, foamed plastics need to use a large amount of chemical additives that are harmful to human health in the production process or product formula, and the additives in the production process will endanger environmental sanitation, while A large number of chemical additives in the product may be dissolved by oil (especially high-temperature oil) and enter the human body, endangering human health; second, the direct source of foamed plastics is increasingly scarce petroleum products. In today's increasingly serious energy crisis, a large number of precious The use of high-grade petroleum products in disposable appliances is a great waste of earth resources; three, foamed plastics cannot be biodegraded, and the speed of photochemical degradation is also extremely long (up to 300 years), and chemical degradation products are also biologically toxic. The large amount of discarded plastic disposables and their accumulation in the environment have caused serious environmental pollution, which is the so-called "white pollution", and the seriousness of the problem has been widely known

[0003] The research on using starch as raw material to produce disposable tableware and convenient bags has been carried out for decades at home and abroad. A large number of studies have shown that there are many insurmountable problems in the production of starch used in the production of disposable tableware. In the final analysis, there is a fundamental problem It is a thermoplastic problem. Starch does not have thermoplasticity, and it will be cross-linked, dehydrated, carbonized, etc. at high temperatures. In order to adapt to industrial production processes, thermoplastic components must be added for finished products. , the interfacial compatibility between lipophilic plastics and hydrophilic starch, the second is the biodegradability of the selected plastic, and the third is the amount of starch added. If starch is simply added as a filler, adding a large amount of starch will significantly reduce the mechanical properties of the product , or cause a great increase in the defective rate of finished products, which has no industrial use value

However, it is meaningless to simply pursue increasing the amount of starch filling regardless of the authenticity rate of the product. After increasing the starch content, the sheet will be very brittle, and it is easy to cause damage to the sheet regardless of stamping molding or blister molding, especially the stamping molding process. Material toughness requirements are higher

[0005] Polypropylene is a high molecular material with high regularity. The molecule is a rigid structure. The material is hard and brittle. The melting temperature is 160°C. When the filling amount of starch is high, if the problem of plasticizing the plastic is not solved and the melting index of the filled plastic is not improved, it will Inability to produce finished products with existing industrial equipment