Preparation And Performance Of Environmental Friendly Straw Fiber Composites

Straw straw fiber composites can replace part of the wood material, which can effectively alleviate the pressure on our country’s forest resources, reflecting the concept of green environment-friendly materials. Our country is facing a shortage of resources and ecological environment deteriorating background, low-carbon emission reduction requirements are more and more attention, SPC as a new green products, attracted research interest of scholars, but still did not achieve significant results this will be the construction of a branch of the direction of sustainable development.Because the silica and wax layer on straw surface, affecting the adhesive on its surface wetting. Untreated fiber hygroscopic and strong polarity so that it is non-polar resin interface between wettability, adhesion worse, peeling ℃ curs over time. This article focuses on the impact of the three treatment methods and characterization of compatibility and mechanical properties of straw fiber composites.Rheological behavior of suspensions of straw fiber in low-density polyethylene( LDPE) melts was investigated at a certain temperature over a wide range of frequencies using a plate rheometer operated in dynamic mode. The viscoelastic of composite melt changed gradually with the straw fiber content increasing, such as at the low frequency region the slope of the G′ decreased from 1.67 of the plain LDPE to0.889 of 50 wt% straw fiber plastic composite. The addition of compatibilizer doubled the tensile strength and the relaxation time reduced from 405 s to 214 s. It was observed that, the presence of compatibilizer may be attributed to improve interaction between the polymer and filler which reduces the resistance of the agglomeration of straw fibers,make the relaxation time decreases so that the straw fiber plastic composite is easier to produce.Alkaline urea treatment Separate pretreated straw fibers can be better to remove the waxy layer of straw fiber surface, interrupting the straw inside the tangled cellulose macromolecules, lignin and ash internal dissolution. Within a certain range, and enhance the bond strength of straw fibers and MDI adhesive, impact strength by 1200 J/m2 up to2036 J/m2; bending strength upgrade from 3.78 MPa to 9.86 MPa. For the resin system,a wash of alkali urea separation type straw fiber reduces the crystallinity of the resin matrix, without removing the straw fiber sample base of small molecules of urea has improved crystallinity of the resin matrix, thus affecting the macro-composites mechanical properties.After the pre-treatment of waste paper, a high cellulose content of recycled cellulose fibers, recycled cellulose has a large aspect ratio, the higher the degree of crystallinity, density, difficult to disperse readily self-binding. Recycled cellulose and straw fiber complex fiber filler, and MDI adhesive pressed into the sheet metal, bendingmodulus increased by 30%, the flexural strength increased by 100%, the impact strength increased by 40%. After the styrene monomer-coated fiberboard MDI system, thickness swelling decreased to 0.6 times the original, styrene addition level 7 wt% MDI fiberboard optimal performance. Recovering the cellulose content of 2 wt% when the optimal physical properties of the resin composite sample. Plant fiber added to promote the resin matrix of the molecular chain of heterogeneous nucleation, crystallization rate compared with HDPE large, and in the recovery of cellulose when 2 wt%,heterogeneous nucleation is more obvious, and accelerated the resin matrix of the molecular chain crystallization behavior.