3results about How to "Fine particle" patented technology

This invention relates to the field of sulfur production technology and discloses an oil-extended insoluble sulfur and its preparation method. The method includes: drying industrial sulfur with a sulfur content ≥99.9% and heating it to 135~145℃ to melt it; heating the molten sulfur to 230~250℃ under a pressure of 1.5~2.5MPa to carry out a polymerization reaction, adding a composite polymerization auxiliary during the polymerization reaction; depressurizing the molten sulfur after the polymerization reaction within 0.1~0.5s and injecting it into a quenching liquid for quenching to obtain crude insoluble sulfur; drying the crude insoluble sulfur and mixing it with iodine, then grinding and aging it to obtain an aged product; extracting the aged product with an extractant and drying it to obtain high-purity insoluble sulfur powder; and coating and extruding the high-purity insoluble sulfur powder with aromatic oil and a composite stabilizer. This invention simultaneously solves the contradiction between low conversion rate of the low-temperature method and poor safety of the high-temperature method, which has long plagued the industry, and achieves better technical results.

This invention provides a flame retardant for water-based fire-retardant coatings for steel structures, prepared from the following raw materials: urea, phosphoric acid, acidic lignin, and pentaerythritol; the weight ratio of urea, phosphoric acid, acidic lignin, and pentaerythritol is 1:(0.8-1):(0.1-0.5):(0.01-0.05). Applying this flame retardant to water-based fire-retardant coatings for steel structures achieves both moisture resistance and flame retardancy.

The re-humidification and atomization system of the re-humidification zone of the tobacco sheet re-drying machine of this utility model includes: a re-humidification zone 1, a re-humidification zone 2, a re-humidification zone 3, a main conveyor belt, a first water tank, a second water tank, a first water pump, and a second water pump. The re-humidification zones 1, 2, and 3 are placed sequentially. The main conveyor belt passes through the main housing of the re-humidification zones 1, 2, and 3 sequentially. The high-temperature condensate recovery pipe is connected to the first water tank through a first automatic switch valve. Hot water and cold water are mixed in the second water tank and then sent to the re-humidification zones 1, 2, and 3 through the main re-humidification humidification pipe and the second pump humidification branch pipe. In the second water tank, the water tank is divided into upper and lower parts by a partition. The cold water pipe enters the upper part of the partition, and a mixing water pipe is set below the partition. Cold water enters the mixing water pipe from the cold water pipe, and hot water from the first water tank extends into the mixing water pipe of the second water tank. Small water outlet holes are evenly distributed in the part of the hot water pipe in the mixing water pipe.