Pellet comprising aramid pulp and filler material
FIELD: manufacturing technology.
SUBSTANCE: invention relates to a pellet consisting of aramid pulp, filler material and moisture, wherein pellet contains not more than 90 wt% aramid pulp, at least 10 wt% filler material and less than 10 wt% moisture and in which amount of moisture, amount of aramid pulp and amount of filler material is 100 % by weight of pellet.
EFFECT: invention also relates to a method for production of such pellet.
SUBSTANCE: invention relates to electroconductive paper and a method of making said paper (versions). The electroconductive paper consists of fibrous crystals of BaV8O21 with length of 0.5-3 mm and thickness of 0.1-10 mcm, interlaced between each other into an electroconductive mass. One method of making the electroconductive paper involves holding xerogel plates in saturated aqueous solution of Ba(NO3)2 for 8-48 hours and then hydrothermal treatment at 150-200°C for 8-48 hours. The plates are then dried in a drying cabinet at 70°C for 8 hours. In another version of the method, xerogel plates are held for not less than 48 hours and the specimen can be freeze dried for 24 hours at pressure 133-10-3 mbar at temperature between -196°C and 0°C.
EFFECT: obtaining electroconductive paper with good mechanical and stable electrochemical properties.
3 cl, 6 dwg, 3 ex
FIELD: process engineering.
SUBSTANCE: proposed process comprises preparation of aqueous slip containing refractory fibres, production of fibrous blank by vacuum forming of aqueous slip and forming of green blank at pressure by rolling followed by drying. Aqueous slip is prepared by aeration homogenization at gas pressure of 0.8-4.0 atm.
EFFECT: higher flexibility, lower density of fibrous heat insulator.
6 cl, 1 tbl, 4 ex
FIELD: textile, paper.
SUBSTANCE: paper-like composite material comprises a mineral fibre, an aluminium salt as a binder and a polyvinyl acetate emulsion and an additive. This material is made on traditional paper-making equipment by method of casting at the specified ratio of above specified components.
EFFECT: production of paper-like material with higher strength, blotting capacity, thermal resistance and heat-, noise-, insulating properties, absence of toxicity and no emission of substances into air, which harmfully affect body organism, resistance of properties to mould, fungi and microorganisms effect in water medium.
SUBSTANCE: film is featured with para-orentation of at least 95% polymer bonds. The method for film making includes polymerisation of para-oriented aromatic diamine and para-oriented aromatic dicarbon acid haloid in the mixture of solvents consisting of N-methylpyrrolidone or dimethylacetamyde and calcium chloride or lithium with obtaining of aramide polymer containing only para-oriented bounds. Then the spinning solution is obtained by solution of the polymer in solvent mixture up to concentration 2 - 6 wt %. The spinning solution is transformed to para-aramide fibrid film with usual known methods used for meta-aramide fibrids production.
EFFECT: enhancing of paper properties, durability, porosity; high heat stability and high content of moisture.
10 cl, 3 tbl, 7 ex
FIELD: textile; paper.
SUBSTANCE: invention concerns obtainment of para-aramid fibrils, as well as paper based on the claimed fibrils. In humid phase poly(para-phenylethylene terephthalamide) fibrils show drainage rate by Canada Standard under 100 ml, specific surface area after drying under 7 m2/g and weight-average particle length under 1.2 mm, defined respective of weight for particles over >250 mcm long (WL0.25). Method of fibril obtainment involves polymerisation of aromatic diamine and aromatic dicarboxylic acid haloid up to para-aramide polymer stage in the mix of N-methylpyrrolidone or dimethylacetamide and calcium or lithium chloride to obtain spinning solution. Concentration of polymer dissolved in the mix is 2-6 wt %. Obtained spinning solution is transformed into fibrils by spinning nozzle in gas flow, and fibril coagulation is performed by coagulation jet. Paper is made of components where at least 2 wt % corresponds to the claimed para-aramide fibrils.
EFFECT: large breaking length of the paper obtained; simple implementation of the fibril obtainment method, issue of equipment corrosion solved.
7 cl, 3 tbl, 4 ex
SUBSTANCE: invention concerns receiving technology of para-aramide fibers, films, paper. Particularly it concerns receiving of polymer solutions for its manufacturing. Nonfibrous polymer solutions contains from 1 till 8 % wt of para-aramide at least, 50 % mol. aromatic remains of which are unreplaced; polar amide solvent, chosen from N- methyl -2- pyrrolidone, N,N'- dimethyl formamide, N,N'- dimethyl acetamide, tetra methyl urea and its mixtures; from 0.5% wt of chloride of alkaline or alkali-earth metal and till 7.5 % wt chloride of alkaline or alkali-earth metal, and till 5% wt of water. At least 50 % wt of formed hydrochloric acid is neutralised with receiving of solution, allowing dynamic viscosity, which is at least three times less than dynamic viscosity of polymer solution without neutralisation.
EFFECT: receiving of nonfibrous polymer solution and para-aramide resembling pulp fiber, paper and film, manufactured from specified polymer solution.
14 cl, 1 tbl, 12 ex
SUBSTANCE: composite building material produced from mixture, comprising the sodium fluorosilicate, chopped straw, microsilica and slurry, produced by mixing the tripoli of Sukholozhskoye deposit ground to specific surface area of 2000 m2/g with 40% solution of sodium hydroxide and water at their weight ratio of 1:1.34:3.1 respectively, maintaining at 95°C during 4 hours and cooling, at the following ratio of components, wt %: sodium silicofluoride 7-9, chopped straw 20-24, microsilica 8-10, the mentioned suspension 57-65.
EFFECT: providing production of wall materials with the use of simplified technology and local raw materials.
SUBSTANCE: stabilising additive for a crushed-stone-mastic asphalt concrete mix, including an organic binder, a structure former and water, the organic binder is paraffin, the structure former is cellulose paper wastes, and additionally it contains a limestone mineral powder at the following ratio of components, wt %: cellulose paper wastes 70-80, limestone mineral powder 8-14, paraffin 8-12, water - balance.
EFFECT: reduced water saturation of asphalt concrete at low leak parameter of a binder, reduced stickiness of a mix and improved physical and mechanical properties.
4 tbl, 5 dwg
SUBSTANCE: wood concrete mix comprises, wt %: portland cement 34.3-36.0; rush cane stems cut into sections of 4-6 cm length with moisture of 10-12% 19.6-20.6; technical sulphur 3.1-3.6; chrome-containing sludge 1.5-1.7; pyrite stubs 6.2-7.2; water - balance.
EFFECT: use of wood concrete with simultaneous production of plastering base on its surface.
SUBSTANCE: panel comprises a ground renewable component in amount from approximately 0.1% to approximately 95% by weight. In a version of realisation the panel has at least one core and comprises: from approximately 0.1% to approximately 95% by weight of the ground renewable component, from approximately 0.1% to approximately 95% by weight of one or more inorganic fibres, from 0.1% to 30% by weight of one or more binding substances, relative to dry weight of the panel. In a version of realisation the ground renewable component has such distribution of particle sizes, when less than 5% of particles are caught by a sieve with holes sized as 0.312 inches, and less than 5% particles go through a sieve with holes sized as 0.059 inches. The method to manufacture soundproof panels includes the following stages, when: they select a ground renewable component; sort the ground renewable component to produce the necessary distribution of particle sizes; combine the ground renewable component, fibres and binding substance with water; prepare a water slurry; form the main mat from the slurry on a wire net with holes; remove at least some water from the main mat; and perform final treatment of the specified main mat for formation of the soundproof panel.
EFFECT: invention makes it possible to improve acoustic and physical properties of a panel.
8 cl, 8 tbl
SUBSTANCE: paper and/or cardboard mass is ground, ground mass is soaked in hot or cold water for swelling and maintained for 60-240 minutes, polyvinyl acetate is added to the swollen mass in the proportion from 1:7 to 6:7 in respect of the ground mass at weight ratio, and the produced mass is mixed for 30-90 minutes to dough consistence, adding a concentrated water-based colouring pigment of certain colour. The produced mass is laid into a shaping-stress mould or penta-elastic moulds for two thirds of height of the mould boards with placement of one or two layers of reinforcement glass fabric plastering net in it with cells of 2-5 mm, then along the length of the mould onto the surface of the mass they lay a T-shaped metal profile as a joint displacement indicator with thickness of 6-10 mm and coat it with additional amount of the specified prepared mass to the upper edge of the mould boards. Then the mass is compacted, removing mass surplus, the mass is frozen, removed from the mould and dried in the dry room until ready, afterwards the finished panel is painted.
EFFECT: improved panel characteristics.