SU457231A3 - The method of obtaining synthetic paper pulp - Google Patents

Description

presented to the finished paper. The resulting pulp can be mixed with paper pulp in any ratios.

PRI me R. 20 kg of high-grade polyethylene having a viscosity corresponding to an average molecular weight of 200,000 is dissolved in 2,000 l of n-hexane prn 138 ° C in a 7000 l glass vessel, resulting in a solution with a polyethylene concentration of 10, 0 g / l. This solution is mixed at a stirring speed of 100 rpm. The pressure in the solution vessel is maintained at 5.0 kg / cm. The solution of polyethylene is fed through an iodide of p1, ny pipeline, which is weakly heated to maintain the temperature of the solution at 138 ° C and pressure of 5.0 kg / cm. The feed pipe is 30 m long and 25 cm in outer diameter. The solution is then passed at a rate of 800 l / h with adiabatic expansion through a nozzle with a diameter of 0.5 inch (12.7 mm), which is a throttling schA valve. Next, the product is passed through a precipitation channel having a diameter of 0.5 inches (12.7 mm) and a length of about 270 mm. From the precipitating channel a fibrous gel with a fiber content of at least 3 wt. % and with a temperature of about 70 ° C at atmospheric pressure are passed into the subsequent channel (secondary) deposition with a diameter of 2 inches (50.8 mm). The fibrous gel is then passed to a partitioning vessel (the vessel e and the vapor or poly cyclone), where the evaporated hexane is removed from the top. The fibrous gel particles accumulate at the bottom, then they are diluted with hex ohm to obtain approximately 1% fiber content, passed through a single-plate refiner, which includes an untreated model plate 12 inches in diameter (305 mm). The raffipper operates at a disk rotation speed of 2000 rpm. Refined fibrous

the slurry is washed in a glass vial and recycled four times over the rafier. Zate.m fibrous suspension containing 1 wt. % of fiber is passed through the filter, and a wet filter-pressed sheet with a fiber content of 13 wt. % is fed to a 2000 L glass calibrated vessel for distilling with an oar. At the same time, 1500 l of water are introduced into the vessel, and to facilitate dispersion, 150 g of polyvinyl paper with a molecular weight of 10,000. The remaining reKcaiH is distilled off with steam from the fibrous product at 60 ° C. The remaining aqueous sustainment of polyethylene fibers containing

1 weight. % fibrous product, then centrifuged to 50% moisture. From slurry3iiii fibers in water cast sheets of paper. The sheets are wrung. They are washed in a standard manner and then 15 s are cooled to 21 ° C, simultaneously

press at a pressure of 7 kg / cm. Zatom.m sheets are subjected to a second identical pressing on the other side, so that both sides of the casting (sheets) and. Have a smooth flat surface. The final stage of drying is carried out in a rotary dryer at 104 ° C. Sheets are tested for durability and optical properties. The resulting paper is more durable than standard pulp.

The subject is invented and

The method of producing synthetic paper mass by preparing a solution of crystalline polyolefin in an organic solvent, passing the solution from the high pressure zone to the low pressure zone, differing in that, in order to obtain a pulp suitable for making high strength paper, while skipping the solution evaporate

20-70% of the initial amount of the solvent and the precipitate is refined and d-evaporated in water.