The effect of density on physical and mechanical properties of phenolic-impregnated cold-pressing reconstituted small-sized bamboo fibrous sheet composite was evaluated. The results indicated that with the density increased from 0.85g/cm3 to 1.20 g/cm3: water absorption decreased, thickness swelling increased first and then decreased; the value of modulus of rupture(MOR) increased from 120MPa to 230MPa, R2 was 0.885; the value of modulus elasticity(MOE) increased from 1.8×104MPa to 2.8×104MPa, R2 was 0.978; the shearing strength (perpendicular loading) increased from 6.5MPa to 18MPa, R2 was 0.978;the shearing strength( parallel loading) increased from 6.3MPa to 26MPa, R2 was 0.973;the compression parallel to grain values increased from 80MPa to 120MPa.
Bamboo fibrosis veneers were impregnated with diammonium hydrogen phosphate, and the content of diammonium hydrogen phosphate was 8%, 13% and 17%, respectively. Then bamboo-fiber based composites were prepared with PF resin adhesive. Combustion and mechanical properties of these fire retardant bamboo-fiber based composite were measured. The result showed that: 1) with the increase of diammonium hydrogen phosphate content, combustion properties increased while mechanical properties fell down, 2) when the diammonium hydrogen phosphate content reached 17%, the heat release rate, total heat release, effective heat of combustion, mass loss rate and ignition time went down by 70.1%, 68.8%, 68.5%, 32.0% and 27.1%, compared with the untreated bamboo-fiber based composites, meanwhile, 3) the MOR was 159.5MPa, MOE was 21241.5MPa and IB was 3.51MPa.
With the melt grafting method using styrene (St) as co-monomer to maleic anhydride (MAH),the VERSIFY (V ethylene-propylene copolymer of the content of ethylene is 12%) was grafted. Different graft yield materials, V-g-(MAH-co-St) (g-V) were obtained. Nylon 6 (PA6)/ PP blends were prepared using twin-screw extruder. Using MFR, SEM, IR and mechanical properties testing analysis methods, morphology and mechanical properties of PA6/PP blends were studying on the different graft yield g-V. The results showed with increasing the graft yield, the minimum melt flow rate decreased and the size of the PP dispersed phase became smaller and more uniform. The addition of taller graft yield materials remarkably improved that the anhydride group in g-V reacted with the amine end groups of the PA6, and PP-PA6 copolymers were formed in situ, which effectively improved the compatibility between PP and PA6. The size of PP domains in the PA6 matrix was significantly reduced. Multi-monomer melt grafting can obtain a high rate of graft material. From the MAH: St = 0.5 to the MAH: St = 1, the grafting yield increased significantly. Continuing to improve MAH: St ratio, the magnitude of changes of graft yield of grafting decreases. Different grafting yield of multi-monomer g-V toughened PA6, a high rate of graft effect was good.
The use of L27 (35) orthogonal to the battery shell injection molding process is optimized. The main factors of technical parameters were determined mould temperature, melt temperature, the speed of injection, injection pressure, cooling time.On the basis of actual production, to determine the factors values of different process parameters.Combination of scrapped products in key (reduction and a high degree of tolerance deflated) tests were selected in the process parameters within the scope of the assessment. Various factors impact on the product of the total height followed by cooling time, mold temperature, melt temperature, injection pressure, injection speed from strong to weak .The best products technological parameters were determined.Good results were obtained for production.
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