SU1017705A1 - Molding composition based on hydrolysis lignin - Google Patents

Abstract

PRESS COMPOSITION ON THE BASIS OF HYDROLYSIS LIGNIN, containing a modular additive, which has been used to reduce the amount of modifying additive and the weight of products based on the press composition, as an adjuvant, the press composition contains coal tar with softening temperature - the product of thermal processing of coal with the following components, wt.%: Hydrolyzed lignin 66-94 T of hard coal tar with softening temperature of 40 ° С. 6-12

Description

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A. SP The invention relates to press positions based on hydrolyzed lignin and can be used to make products at elevated temperatures. A known press composition based on hydrolytic lignin containing hydrolyzed lignin and a modifying agent — sludge from the pipelines of the hydrolyzate transport system 1. The lack of a press-mass is the deficiency of the additive and its expensiveness due to the fact that there is little sludge in the hydrolysis process and it is necessary dry and grind feathers by entering into hydrolytic lignin. Closest to the proposed press composition based on hydrolyzed lignin, containing a modifying additive peat resin 2. To obtain products based on a known composition with enhanced physicomechanical indicators, it is necessary to introduce into the composition a 15% modifying additive that increases the weight these products. The aim of the invention is to reduce the amount of the modifying additive and the weight of the products based on the composition. The goal is achieved by the fact that the press composition based on the hydrolysis lignin containing the modifying additive contains as a modifying additive a hard coal tar with a temperature of 40 ° C - the product of thermal processing of coal in the following ratio of components, wt.% g Hydrolytic lignin 88-94 T yellow coal tar 6-12 T yellow coal tar is large-ton An important waste from the thermal processing of coal is a viscous, unstable dark brown product. Its group composition, wt.%: Paraffins 15.96; neutral oil 42.00, phenols 19.44, bases 0.31; acid 0.35; asphaltenes 16.59, carbo carbo, tsy 5.35. Such a composition of the press position contributes to the expansion of its raw material base and provides an increase in the physicomechanical parameters of products based on it. Example. For the manufacture of the press composition, crushed hydrolysis lignin with a dispersion of not more than 2 mm is taken in which additional coal tar is added. The components are thoroughly mixed until a homogeneous mass is obtained. The resulting mixture is dried to a residual moisture content of 8%. In Table. 1 shows the press compositions with different content of components. The resulting press compositions are precompressed with a punch into a briquette at 20 ° C and a pressure of 30 MPa, and then finally at a pressure of 15 MPa. For physico-mechanical tests, samples were prepared with dimensions of 200x50x10 mm, cut from pressed sheets with a thickness of 10 mm. From Ksshda press compositions tested in 30 samples. The test results are presented in Table. 2. From table. 2, it can be seen that the strength properties and hardness of products with the addition of heavy coal tar exceed the corresponding indicators of products from one hydrolytic lignin. The density of the products. On the basis of the proposed and known press compositions is presented in table. 3. The optimum amount of heavy coal tar in a press composite is in the range of 6-12 wt.%. With such a resin content, the number of reactive groups and the binder significantly increases, which increases the reactivity of the press composition, which ensures a dense solid monolithic structure and solid surface of the pressed products with low water absorption. The content in the press composition of heavy coal tar less than 6 wt.% Does not contribute to a significant increase in the reactivity of the composition, which in turn does not lead to an improvement in the physicomechanical characteristics of the products. A heavy coal tar content in the press composition of more than 12 wt.% Leads to its leakage from the mold during hot pressing, along with it, part of the hydrolytic lignin is removed from the mold. This leads to a decrease in the density of products, an increase in the number of macro and micro hollow in their structure, a decrease in cohesive and adhesive bonds, resulting in a decrease in strength, hardness and an increase in water absorption of the products. The introduction of heavy coal tar into a press composition based on hydrolytic lignin makes it possible to increase the strength during static bending by 2.39-2.82 times, the tensile strength by 5.31-7.08 times, and the hardness 2 times. , 06-2.54 times and reduce water absorption by 2.75-3.27 times in comparison with products from one hydrolytic lignin. This increases the durability of pressed products.

exploitation of cich both at normal and at high humidity in conditions of increased erosion of the environment. In addition, coal tar tar is a large-capacity thermal waste, coal processing, which does not find industrial application, therefore its use helps reduce the cost of products based on the composition.

Table 1

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Table 3

Claims (1)

HYDROLYSIS LIGNIN PRESS COMPOSITION containing a modifying additive, a t and h a Join with the fact that, in order to reduce the amount of modifying additive and the weight of products based on the press composition, the press composition as a modifying additive contains heavy coal tar with a softening temperature of 40 ^ C - the product of thermal processing of coal in the following ratio of components, wt.%: Hydrolysis Lignin 88-94 Heavy coal tar with a softening point of 40 ”C 6-12