Preparation And Performance Of Resin-based Composite Materials With High Strength High Modulus And Heat Preservation

In recent years, various personal safety events have occurred occasionally. For example, frostbited in cold environment, disabled in mechanical processing accidently, which improve people's precaution consciousness of their safe. Requirement of clothing with high strength and high modulus and thermal insulation becomes more urgent. At present, high strength and high modulus fiber textile are used for high strength and high modulus insulation clothing. Although they show excellent physical and mechanical properties, they cannot be applied for civil use because of high price and poor comfortable. Therefor, Si O₂ aerogel is adopted as insulation functional particles which has high porosity, low density, low thermal conductivity, and is used as super thermal insulation materials generally. unsaturated polyester resin with excellent mechanical performance, easy to shape and high cohesiveness, which is used as the matrix materials. Develop new composite materials with high strength, high modulus, good thermal insulation performance.First, select TEOS as silica source, diluted HCl and NH₃·H₂O as catalyst, Et OH as solvent, by acid-alkali catalysis to prepare Si O₂ aerogel. Influence of Et OH/TEOS molar ratio?H₂O/TEOS molar ratio?p H value?reaction temperature and stirring speed on Si O₂ aerogel density are discussed. Optimum preparation process of Si O₂ gel is obtained by orthogonal experiment: molar ratio of TEOS:Et OH:H₂O is 1:7:5, p H value is 7, reaction temperature is 55?, stirring speed is 100r/min; After aging in Et OH/TEOS mixture for 12 h, modified Si O₂ gel with trimethylchlorosilane, finally density of 0.28g/cm3 Si O₂ aerogel is obtained. Infrared spectrum of Si O₂ aerogel is tested and analyzed, the results conform to the spectral characteristics of silica peak; water content of modified Si O₂ aerogel is much less than unmodified Si O₂ aerogel, this shows that modified Si O₂ aerogel has good hydrophobic; Partical size of most Si O₂ aerogels is 100 nm obtained by nano laser granulometer; Si O₂ aerogel is stacked by spherical particles, which form the nano porous network structure.Secondly,Si O₂ aerogel/resin combined finishing agent is prepared by blending method and resin-based composite materials with high strength?high modulus and heat preservation is prepared by direct coating. Insulation rate and tensile strength are tested, mechanical property is analyzed, find that the insulation rate and tensile strength achieve the optimal value, respectively increased to 47.85% and 1350 N when coated weight is 30wt% and Si O₂ aerogel mass fraction is 2%,the initial modulus of finished fabrics can be up to 956 MPa, which is improved significantly compared with the original fabrics.Finally, unfinished fabrics are tested synthetically. Compared with original fabric, Bursting strength and tearing strength are increased by 27.1% and 33.3% respectively improved significantly; Compression work and compress recovery ratio are slightly declined, which indicated that filling power and sense of fullness of finished fabrics are influenced; Resistance to shear deformation and response ability after the shear deformation are both perfected; Thermal resistance and moisture resistance of finished fabrics are aggrandized, heat retaining property is enhanced obviously, gas permeability is declined slightly; Abrasive resistance is increased by 70% and thickness is improved from 0.20 mm to 0.35 mm.