| Polyurethane foam is widely used in the fields of impact protection,logistics packaging,civil construction and automotive engineering.However,due to the poor mechanical properties and easy tearing of polyurethane foam,its application is limited.In order to meet the needs of low-cost and high-performance cushioning composite materials,polyurethane foam is used as the base,bentonite particles and three different types of fabric air layer structures are added to construct cushioning composite materials.This article first uses bentonite particles to enhance the cell structure of the polyurethane foam to improve its thermal and mechanical properties.In order to further improve the cushioning performance,the columnar separation type,spring-like separation type and honeycomb monolithic air layer structure are combined to construct a polyurethane composite material with a cell structure,a fabric structure and an air layer structure in order to realize its use in packaging and transportation protection materials.And the application of sports protective materials to protect the human body from harm.The research content of this article is as follows:(1)Using polyurethane foam as the base,strengthened by bentonite particles to improve the cell structure,in order to explore the influence of bentonite content on cell size,thermal properties and mechanical properties.On the basis of the optimal content,by adding a columnar fabric separated air layer structure,the effects of fabric types and air layer spacing on compression performance,cushioning performance and recovery performance are discussed,the optimal parameters are determined,and the fabric air layer structure is realized Application of filling polyurethane foam.(2)In order to optimize the shape of the air layer and explore the relationship between the energy absorbed per unit volume and the content of the fabric air layer,the spring-like separated air layer polyurethane cushioning composite material is constructed by introducing a spring-like separated fabric air layer structure and composite with polyurethane foam.The influence of the spring-like structure radius difference on the compression and cushioning performance is studied.On the basis of the optimal radius difference,further explore the double-layer spring-like air layer as the filling structure,explore the influence of the arrangement method on the compression and cushioning performance,and explore the cylindrical separation and spring-like separation air layer composite material absorption The ratio of energy to the required fabric air layer to achieve the optimization of parameters.(3)In order to further explore the influence of separate and integral air layers and fabric content on mechanical properties,a honeycomb integral air layer polyurethane composite material is constructed by adding a honeycomb integral fabric air layer structure.The influence of the side length of the hexagon on the compression and cushioning performance is discussed.On the basis of the optimal content,the influence of honeycomb wall thickness and multiple impacts on compression and cushioning performance is discussed.The bentonite-reinforced polyurethane foam is used as the base material,and the honeycomb monolithic air layer is used as the filler to construct a composite cushioning material.And discuss the ratio of the energy absorption of the separated air layer and the integral air layer composite material to the required fabric air layer,and choose the material with the lowest cost and good cushioning performance.Through the above research,on the basis of adding bentonite reinforced,composite separated,spring-like and honeycomb monolithic fabric air layer structure,a polyurethane cushioning composite material was prepared,and the relationship between energy absorption and the shape and content of the fabric air layer was discussed.,It realizes the air layer polyurethane foam cushioning composite material with low cost,not easy to delamination and good mechanical properties. |
PDF Full Text Request