Synthesis And Modification Of Polysilsesquioxane And Its Application On Wood Surface

As an important building material,wood is rich in fibrous tissues,micropores,and ducts.It absorbs moisture in the air through capillary phenomena,combined with the influence of various natural factors,makes wood produce a variety of diseases,affecting the use value and ornamental value,greatly shorten the service life.In this study,the main purpose of preparing super-hydrophobic wood,while improving other properties to a certain extent,using a simple one-step synthesis of polysilsesquioxane(MS),and then use a silicone sealant(GT)to evenly fix MS on the wood surface.Finally,stearic acid(SA)with long-chain alkanes was used to modify its surface.The main purpose of the experiment is to screen the best process conditions,such as:MS synthesis conditions,GT concentration,SA concentration,SA modification time,drying temperature,fixed temperature,etc.At the same time,hydrophobicity,color difference,self-cleaning,abrasion resistance,adhesion,freeze-thaw resistance,water absorption,antibacterial,acid and alkali resistance and ultraviolet aging are tested.First,1.2g of MTES and 0.2g of silica sol(MTES:silica sol=6:1)were placed in 30mL of absolute ethanol solvent,20mL of alkali catalyst(0.1mol/L NaOH)was added,and the ultrasonic reaction was performed at room temperature for 2.5h.The cube-shaped MS particles obtained are of regular structure,smooth surface,uniform size and size of about 2 μm.The treated wood surface has a contact angle of 141.5°.Then,the MS solution with a solid content of 1.5%and the 2%GT solution were mixed at a ratio of 1:1 by volume,and dispersed uniformLy by ultrasound for 30 minutes.After soaking the wood in it for a period of time,let it dry at room temperature.It was then fixed at 120℃ for 30 minutes.The contact angle reached 149.41°.Finally,2%SA solution was used to modify the wood for 30min,and the wood contact Angle was 157.64°,reaching the super hydrophobic level.In addition,other performances have also improved to varying degrees.