Abstract
Sodium alginate and natural fiber were used as modifiers to prepare sodium alginate natural fiber type biological composites. The mechanical properties were characterized by universal testing machine, and the thermal properties were analyzed by conductivity, The effects of wood fiber and straw fiber content on the comprehensive properties of biological composite materials were evaluated by relevant instruments, and the feasibility of biological composite materials as building energy-saving wall insulation materials was evaluated. The results show that the flexural strength, compressive strength and elastic modulus of the composites increase with the increase of wood fiber content. When the wood fiber content is 100%, the mechanical properties of the sample are the best, the flexural strength is 0.573 MPa, and the compressive strength is 1.410 MPa. The results showed that wood fiber and sodium alginate binder were closely combined and had good wettability. The thermal conductivity of biological composite is 0.078-0.089w / (m · K), which means it has good thermal insula tion performance and can be used as thermal insulation material for building energy-saving wall. The results show that the properties of the composite can be improved by adding a higher proportion of wood fiber and a certain amount of glyoxal crosslinking agent.
Highlights
According to statistics, the annual greenhouse gas emissions of the construction industry account for about 1 / 3 of the earth's basic emissions, especially in building insulation materials, the extensive use of fossil and mineral materials has caused serious ecological pollution.[1]
The main purpose of this paper is to study the comprehensive utilization performance of alginate natural fiber type of biological composite materials, so as to develop a new environmental protection and sustainable building energy-saving wall insulation
Sodium alginate natural fiber bio-composites were prepared and the doping ratio of wood fiber and rice straw fiber was studied in detail
Summary
The annual greenhouse gas emissions of the construction industry account for about 1 / 3 of the earth's basic emissions, especially in building insulation materials, the extensive use of fossil and mineral materials has caused serious ecological pollution.[1] At the same time, this kind of insulation material is not renewable, so it is difficult to recycle, resulting in a huge waste of resources. Tannin is a natural polyphenol widely existing in nature, but only concentrated tannin has good chemical reactivity.[4] Bio resins extracted from sunflower seeds, soybean and other plant proteins can be used for NFC, but their low water resistance and high oil purification cost limit their application
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