Anti-aging impact-resistant modified wood-plastic composites (WPC) and preparation method thereof

Abstract

The invention provides an anti-aging impact-resistant modified wood-plastic composites (WPC) and a preparation method thereof. The wood-plastic composites are prepared from the following raw materials in parts by weight: 20-50 parts of polyolefin, 30-70 parts of enzymatic hydrolysis lignin modified vegetable fibers, 1-3.5 parts of polymerized rosin, 0.1-10 parts of an inorganic filler, 0.1-4 parts of an antioxidant, and 0.1-3 parts of an ultraviolet screening agent, wherein the enzymatic hydrolysis lignin modified vegetable fibers are prepared from enzymatic hydrolysis lignin and vegetable fibers through an anhydride reaction. According to the modified wood-plastic composites prepared by the invention, the affinity between the vegetable fibers and plastic is high, the dimensional stability of the composites is high, the rigidity and toughness are balanced, and ageing resistance is also improved at the same time; in the process of preparing the enzymatic hydrolysis lignin, a certain amount of ligninase is added, thus improving the impact resistance of the wood-plastic composites prepared from the enzymatic hydrolysis lignin modified vegetable fibres. Through the method of using the lignin to modify the vegetable fibers provided by the invention, lignin resources are fully used, waste is turned into treasure, and comprehensive utilization of the lignin resources is realized.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to an anti-aging and impact-resistant modified wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composites (Wood-Plastic Composites, WPC) is a new type of composite material that has been booming at home and abroad in recent years. It refers to the use of polyethylene, polypropylene and polyvinyl chloride, etc. Wood flour, rice husk, straw and other waste plant fibers are mixed into new wood materials, and then processed by extrusion, molding, injection molding and other plastic processing techniques to produce boards or profiles. Mainly used in building materials, furniture, logistics packaging and other industries. Wood-plastic composite materials have risen in full swing. Most of the existing technologies focus on plastic components, reinforcements, toughening fillers, and weather-resistant agents. Research on modifie...

AI Technical Summary

Problems solved by technology

The wood-plastic composite materials disclosed in the above patents all add lignin and plant fibers to improve the mechanical properties, thermal stability or anti-aging performance of the composite materials, but the compatibility between lignin and plant fibers is poor, although they Both contain hydroxyl groups, which can form hydrogen bonds to generate a certain affinity, but they are still weak interface bonds, and then there is poor interface stress transmission of the formed wood-plastic furniture materials, resulting in poor impact resistance, poor dimensional stability, rigidity and toughness of composite materials. problems such as imbalance

Moreover, lignin is obtained through strong acid and strong alkali treatment, with fewer active groups, resulting in a further decrease in interfacial binding force

[0004] In addition, with the rise of outdoor activities, especially outdoor furniture, such as plastic tables, beach chairs and other easy-to-clean and easy-to-storage products are generally welcomed by people, but it is also affected by long-term sunlight, aging of materials, and machinery. The performance continues to decrease, and the surface of white or light-colored products shows yellowing and other problems are becoming more and more prominent, which directly leads to the continuous shortening of the life of the product and seriously affects the use value of the product

In the prior art, due to the weak interfacial bonding force between lignin and plant fibers, the anti-aging performance of wood-plastic composite materials will also deteriorate

Images