Anti-aging and impact-resistant modified wood-plastic composite material and preparation method thereof

Abstract

The invention provides an anti-aging and impact-resistant modified wood-plastic composite material and a preparation method thereof. The wood-plastic composite material comprises the following raw materials in parts by weight: 20-50 parts of polyolefin, 30 parts of enzymatically hydrolyzed lignin modified plant fiber -70 parts, 1-3.5 parts of polymerized rosin, 0.1-10 parts of inorganic filler, 0.1-4 parts of antioxidant, 0.1-3 parts of anti-ultraviolet agent, the enzymatic lignin modified plant fiber is obtained by enzymatic lignin and Plant fibers are obtained by the reaction of acid anhydrides. The modified wood-plastic composite material prepared by the present invention has high affinity between plant fibers and plastics, high dimensional stability of the composite material, balanced rigidity and toughness, and improved aging resistance; in the process of preparing enzymatic lignin, adding A certain amount of lignin enzyme can also improve the impact resistance of wood-plastic composite materials prepared by enzymatically hydrolyzing lignin to modify plant fibers. The method for modifying plant fibers by using lignin provided by the invention makes full use of lignin resources, turns waste into wealth, and realizes comprehensive utilization of lignin resources.

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

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