Research On Preparation Technology And Properties Of Wheat Straw Inorganic Scraps Board

China China is a large agricultural country,every year due to the cultivation of crops produced by agricultural straw resources,but the utilization rate of straw resources is low,a large number of straw resources are burned and abandoned,damaging the pollution of the ecological environment.At the same time,China is a country with scarce forestry resources,with the rapid development of China’s economy,the contradiction between the shortage of wood raw materials and the increasing demand for wood panels is increasingly prominent.The use of crop straw as raw materials to manufacture wood-based panels can effectively alleviate the problem of insufficient supply of wood resources,which is of great significance for resource utilization and environmental protection.In this paper,the inorganic shredded straw boards were prepared by hot pressing process with straw shredder as raw material and using environmentally friendly inorganic adhesive,and the influence of each process parameter on the board performance during the board preparation was investigated,and the specific research contents and conclusions are as follows:The raw material of straw crushed material and the laboratory homemade inorganic adhesive were used to prepare the artificial board,and the orthogonal test method was used to design and arrange the test to investigate and analyze the effects of four factors,namely hot pressing pressure,hot pressing temperature,hot pressing time and glue straw ratio,on the various physical and mechanical properties of the artificial board,and the internal morphology of the board was observed by scanning electron microscope for analysis and demonstration.The results showed that the three factors of hot pressing pressure,hot pressing temperature and gum straw ratio had significant effects on the physical and mechanical properties of the panels,while the hot pressing time had less effects on the properties of the panels.The straw segments were soaked in different concentrations of alkali solution to investigate the effect of alkali solution concentration and soaking time on the mass loss rate and mechanical properties of straw segments,and the surface morphology of straw was observed by scanning electron microscope to further analyze and prove the data basis for the subsequent alkali solution pretreatment of straw shreds.The results showed that with the increase of alkali solution concentration and the extension of soaking time,the mass loss rate of the sheet continued to increase and the mechanical properties continued to decrease.Through scanning electron microscopy found that alkali solution treatment can effectively remove impurities such as cuticle on the surface of straw segments,but if the treatment time is too long and the concentration is too large will cause damage to the fine view of straw fibers and damage the mechanical properties of the straw itself,comprehensive consideration of the concentration of 2% alkali solution treatment of straw shreds,pretreatment time of 18 h.The response surface test was designed by Box-Behenken method,and the variables of hot pressing pressure,hot pressing temperature and glue application amount were used to analyze the trends of static flexural strength(MOR),modulus of elasticity(MOE),internal bond strength(IB)and water absorption thickness expansion rate(TS)of the panels.The results of the study show that the treatment with alkali solution can be used to improve the performance of the panels.The results of the study showed that the performance of the artificial board made from straw scraps treated with alkali solution was improved compared with the untreated board;the best process parameters of the response surface optimization test were 8.7MPa hot pressing pressure,142℃ hot pressing temperature,and 1.2 glue to straw ratio,and the performance of the board met the national standard;it was observed by scanning electron microscope that the alkali treated straw scraps were more closely bonded with the adhesive,and the internal structure of the board was more dense.The internal structure of the board is more dense.