| Marijuana (hemp) fiber is a kind of environmental friendly textile raw materials.Hemp can be planted easily, does not need fertilizer, and is biodegradable and doesnot produce harmful gas after combustion. This fully adapts to the need of the pursuitof green environmental protection,sustainable development and resource saving forcurrent people. At the same time, hemp fiber has certain strength, excellent moistureabsorption and desorption, anti-bacterial, and anti-UV performance. These character-ristics meet the needs of the development of the textile.This topic takes the hemp fiber which is0.5tex in fineness,30mm in lengthprovided by Beijiang MaYe co., Ltd. as raw materials. The morphological structure,single fiber strength, friction coefficient, hygroscopicity, acid and alkali resistanceperformances of hemp fiber were studied systematically. Based on the testing andanalysis of hemp fiber and a large number of basic tests, the basic technicalparameters of hemp needle punching were determined. Using the orthogonalexperiment method, the depth of penetration, puncture density and fiber blended ratiowere chosen as three factors. The better process is that puncture density is240stab/cm2, preliminary depth of penetration is7mm and reverse depth of penetration is5mm, the blended ratio of hemp fiber/cotton fiber is70/30. And the effects ofprocessing parameter on the performance of needle punching nonwovens wereanalyzed.In order to expand the application range of the products, four products withdifferent basic weights were designed, such as80~100g/m2,210~230g/m2,280~300g/m2and300~320g/m2. And to increase the contrast, the product with basic weight of210~230g/m2was hot rolled after needle punching, five group of products weredeveloped in total. And the characteristics index, mechanics performance, rigidity,abrasion resistance, air permeability and ultraviolet resistance were tested, and thedifferences of properties from each other were analyzed and compared.The magnesium hydroxide was selected as flame retardant, the polyvinyl acetateemulsion as binder, and A-172as coupling agent, the hemp fiber nonwoven autointerior materials were given a flame retardant finishing. The flame retardant massconcentration, adhesive volume concentration and impregnation time were chosen asthree factors, using the orthogonal experiment to optimize finishing technologies, an optimal flame retardant finishing process was obtained: flame retardant massconcentration is300g/L, adhesive volume concentration is25%, and impregnationtime is30min.The fabrics after flame retardant finishing were tested, including flame retardanteffect, weight gain rate, breaking strength, whiteness, wetting effect, scanningelectron microscopy, thermal gravimetric analysis, etc. The results show that exceptthe flame retardant performance of80~100g/m2group was level3, the product’sflame retardant performance of rest groups achieved qualified requirements. Afterflame retardant finishing, the granular materials on the surface of the fiber weregreatly increased, fiber surface were coated by flame retardants, pyrolysis temperaturewas increased, the maximum thermal weight loss rate was significantly reduced, from351.66℃to239.36℃, weight losswas reduced about41%, while the fabric breakingstrength, whiteness were improved. In addition, the flame retardant performances ofthe five types of hemp nonwoven auto interior materials were evaluated by usingfuzzy comprehensive evaluation method. The results show that the performance offlame retardant of fabric with basic weight of280~300g/m2was best,300~320g/m2was the second,210~230g/m2hot rolled group and210~230g/m2were the third, and80~100g/m2was the worst. |
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