Bio-based polyolefin composite material and preparation method therefor

Abstract

The invention discloses a bio-based polyolefin composite material which comprises the following raw materials in parts by weight: 30-60 parts of modified blue algae, 25-40 parts of polyolefin, 5-20 parts of a reactive plasticizer, 5-10 parts of a bulking agent, 1-5 parts of a lubricant and 0.1-0.5 parts of an antioxidant. The raw materials are mixed and subjected to extrusion and granulation through a co-rotating twin-screw extruder to prepare the bio-based polyolefin composite material. The composite material is good in component compatibility and excellent in mechanical property, and has a very wide application prospect; and the dependence on a petroleum-based material can be reduced, the white pollution is alleviated, a treatment method for turning blue algae into wealth is provided during algal bloom outbreak, and the ecological environment is protected.

Description

technical field [0001] The invention relates to the technical field of bio-based polymer materials, in particular to a polyolefin composite material prepared by adding modified cyanobacteria. Background technique [0002] Plastic products have been widely used in various sectors of the national economy, mainly due to their advantages of light weight, good mechanical properties, water resistance and chemical corrosion resistance, beautiful appearance, convenient manufacturing and installation, and low price; according to statistics, the world's plastic products The total output is nearly 100 million tons, which accounts for more than 75% of the total volume of the three major synthetic materials, and the volume output ratio with steel reaches 92%. However, the chemical stability of traditional plastics is very good, and they can hardly be degraded in nature. When the plastics industry develops to a certain extent, more and more plastic wastes are discarded, almost to the exte...

AI Technical Summary

Problems solved by technology

However, truly degradable plastics such as polylactic acid, polyhydroxyalkanoate, polybutylene succinate, and polybutylene adipate / terephthalate are more expensive and perform better than traditional plastics such as poly There is a certain gap between propylene and polyethylene, which limits its large-scale development and application

Filling modified polymer materials with degradable materials such as plant starch and plant protein to prepare partially degraded composite materials has attracted attention from all over the world. This method is in line with the concepts of resource saving, cost economy and environmental protection; Proteins such as cornstarch, soy flour, and soy protein isolate used as fillers in composites lead to higher food prices, affect animal feed markets, and take up more agricultural land

[0004] With the rapid growth of economy and population, the eutrophication of water body is becoming more and more serious, and the phenomenon of cyanobacteria bloom occurs frequently. Freshwater lakes such as Taihu Lake, Dianchi Lake, and Chaohu Lake have several times of cyanobacteria outbreaks every year, and thousands of tons of cyanobacteria need to be treated every day. Spirulina contains abundant natural high molecular polymers such as protein and polysaccharide, so it can be used as a filler to replace starch to prepare composite materials; people such as Mark Ashton Zeller disclose edible microalgae (spirulina and chlorella) and high-density A method for preparing thermoplastic composite compositions by blending polyethylene and hot pressing, however, the dispersion of algae in high-density polyethylene is poor through simple blending, and it is difficult to produce strong interfacial adhesion between high-density polyethylene and microalgae , thus affecting the mechanical properties of the composite material; on the other hand, the thermoplastic composite composition prepared by using glycerol as a plasticizer has a certain degree of water absorption, and the small molecule plasticizer is easy to migrate, thus affecting the performance of the composite material (Journal of Applied Polymer Science, 130:3263–3275, 2013)

The Chinese invention patent application with publication number CN104114689A discloses a kind of algae thermoplastic, which obtains a thermoplastic material by acetylating Chlorella and Prototheca after oil extraction, but the protein content of the algae biomass used is less than 15%, and Wet modification uses a large amount of acylating reagents to increase production costs

In addition, the plasticizer used cannot form chemical bonds with the microalgal biomass, and there is also the possibility of plasticizer migration