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Дата последнего поиска статьи во внешних источниках: 27 января 2016 г.
Аннотация:Contemporary materials should be of high specific strength, efficiency, impact resistance, low density, manufacturability. These requirements are largely responsible natural wood composite. However, not all tree species and the tree is optimized for use in industrial production. The creation of artificial composite materials based on different breeds and wood waste, whose properties are close to the native properties of technically important wood is a challenge. The paper deals with issues related to technology and the properties of matrix composite materials obtained through a variety of wood waste. The technology is based on the method of mechano-chemical transformation of wood waste in the process of dispersion and dispersion of the amplifying processing component.
Used in industrial waste wood of Siberian larch, birch, Siberian cedar. As a reinforcing component in the manufacture of models of composite materials was investigated synthetic latex of polyvinyl acetate, urethane rubber. Dispersion of wood waste was carried out using the rotary-pulsation apparatus for liquor equal to 15 and number of cavitation 1. The results of the granulometric composition of the resulting wood pulp indicate that the dispersion leads to an exponential distribution of solid fractions ranging from <0.5 to 10 microns. Probable size of the particles is less than 0.5 microns in number average size of 2.4 microns. According to microscopy, the original timber, detecting cellular elements ordered in the longitudinal direction of the barrel, when dispersed and loses its native structure also tends to the organization of secondary structure, characterized by a pronounced roundness of the structural elements that reach a size of 30-45 microns. From the wood of the Siberian larch after dispersion by the method of forming a band with a force of 1.5 kg/cm2, followed by exposure of the samples during the day at 605 оС (to a residual moisture content 15%), samples and technical pressure-treated wood, characterized by mechanical strength of 45-50 kg/cm2. Using the reinforcing component, such as polyvinyl acetate latex
(2-5%) by dispersing the wood enhances the strength of the samples pressure-treated wood is 3-4 times while maintaining the conditions of molding.