Development Of High-efficiency Green Preservatives Based On Chelators And Organic Biocides For Protecting Masson Pine Wood

Preservation treatment is an important way to prolong the service life of wood and expand the application fields of wood and resources.However,the existing wood preservatives and treatment technologies generally have some problems,such as heavy metal pollution and low-efficiency.Therefore,developing non-metallic green and efficient wood preservatives is an important and hot research topic in the field of wood preservatives in China.In this paper,fast-growing Masson pine wood was taken as the research object.Based on systematic research on its decay characteristics and mechanism,a synergistic preservative strategy of organic biocides and chelator was studied,and a water borne organic-chelator green high-efficiency wood preservative was prepared,and the decay resistance performance and mechanism of the treated wood were found out.The research results will provide a new way for research and development of green and efficient wood preservative,and provide insights for research and development of wood preservative treatment technology and industrial application in China.The main conclusions of this paper are as follows:1.The wood decay characteristics and mechanism of Masson pine were explored.With the extension of decay time,the mass loss of Masson pine increased gradually,and the quality loss caused by brown rot fungi was significantly higher than that caused by white rot fungi.When the decay time was 12 days,the mass loss caused by Coriolus versicolor(white rot fungus)and Gloeophyllum trabeum(brown rot fungus)was 3.11%and 15.75%respectively.In the process of brown rot,the hemicellulose,amorphous cellulose and crystalline cellulose of Masson pine wood were degraded in turn,and the crystallinity of cellulose and crystal width increased at first and then decreased,which was related to the non-enzymatic degradation pathway of iron-based Fenton chemistry.2.A water-borne organic-chelator green and efficient wood preservative was prepared.Diethyltriaminepentacetic acid(DTPA)and sodium iminodisuccinic acid tetrasodium(IDS)were selected as efficient chelating agents for iron ions,which could effectively inhibit the reduction activity of iron ions,and the inhibition efficiency was positively correlated with the concentration of chelator.Two kinds of water-borne organic-chelator green and efficient preservatives,DCOI-DTPA and DCOI-IDS,were prepared with chelating agent and isothiazolone fungicide as the main effective components,which had excellent stability,antibacterial and permeability.The optimum ratio of organic fungicide and chelator was 10:1.3.The decay resistance of organic-chelator green and efficient preservative treatment materials was characterized,and its mechanism was revealed.The organic-chelator preservative treatment materials had excellent decay resistance.When the DCOI loading was about 0.2 kg/m3,the mass loss of DCOI-DTPA and DCOI-IDS treatment materials was lower than 5%,reaching the level of strong decay resistance grade I.Compared with untreated wood,the iron content of organic-chelating preservative impregnated wood was reduced,and IDS significantly reduced the degradation rate of organic fungicide DCOI,which realized the synergistic enhancement of Masson pine wood decay resistance.