A manufacturing process for environmentally friendly flame-retardant straw board

Application Number: CN201710450729.2 Application Date: June 15, 2017

Publication Number: CN107127841A Publication Date: September 5, 2017

[Applicant] Shi Zhi [Address] Building 61, Songtaoyuan, Wuchang District, Wuhan City, Hubei Province, China 430064

[Inventors] Shi Zhi; Xu Zhengming; Shi Zhuwu

Patent Agency: Wuhan Yuchen Patent Office, No. 42001, China. Agent: Wang Minfeng.

[Country and Province Code] 42

[Abstract] The present invention discloses a manufacturing process for environmentally friendly flame-retardant straw board, comprising the following steps: (1) removing impurities from crop straw and crushing it; (2) measuring and packaging it; (3) laying it into a mold; (4) pre-pressing and forming it; (5) shaping and cold pressing it; (6) locking it into the mold; (7) curing and demoulding it; (8) drying it; (9) sawing the edges of the semi-finished product; (10) sanding it; (11) packaging and warehousing it. The manufacturing process adopts room temperature cold pressing technology, which is simple and does not require high temperature heating. The gluing can be completed at room temperature. The slab is dried only by microwave technology in the drying process, which does not consume solid fuel, and the factory has no chimney. The whole process is green and environmentally friendly. In addition, the present invention uses straw as the main raw material and is supplemented with an inorganic flame retardant and an inorganic binder with excellent performance. The obtained straw board is flame-retardant at high temperatures above 1200°C, does not carbonize, does not deform, and does not generate harmful smoke and gas. It also does not conduct heat at high temperatures and does not expand when exposed to water. The overall performance is very excellent.

[Sovereign Item] A manufacturing process for an environmentally friendly flame-retardant straw board, characterized in that it comprises the following steps: (1) impurity removal and crushing of crop straw: using special equipment to remove bricks, stones, soil and metal impurities from the straw, and naturally air-drying the cleaned straw to control the moisture content of the straw between 7 and 12%; then the straw is respectively input into a surface layer crusher and a core layer crusher for crushing, the surface layer crusher is crushed to 3 and 5 mm, and the core layer crusher is crushed to 5 and 10 mm; (2) metering and packaging: weighing raw materials according to 50 to 100 parts of surface layer and core layer straw particles, 10 to 200 parts of flame retardant, and 1 to 50 parts of adhesive, and then respectively mixing the straw particles, flame retardant and adhesive according to the different surface and core layer straws. Place in different containers and stir evenly to form surface and core layer mixtures; (3) Paving into molds: transport the surface and core layer mixtures to the paving machine respectively, and pave the surface layer mixture according to the surface layer, and pave the core layer mixture according to the core layer. The paving machine evenly paves the surface and core layer mixtures on the pad in 40#60 times to form 40#60 pavement mixture layers, and then each pavement mixture layer together with the pad is sent to the mold; (4) Pre-pressing: at room temperature and a dew point temperature of 60#95 degrees Celsius, apply a pressure of 1.5×105#1.0×106 Newtons to the mixture on the pad, and after pre-pressing for a certain period of time, form the straw fiber prefabricated board; (5) Shaping cold pressing: at room temperature, 40#60 The straw fiber prefabricated slab is placed together with the pad in a clamping mechanism, and a pressure of 1×107 to 1.5×107 Newtons is applied, and the pressure is kept constant for a period of time to form a straw fiber slab of a certain height; (6) clamping: the straw fiber slab obtained in the above-mentioned shaping cold pressing step is locked in the mold together with the pad, and a pressure of 1.1×107 to 1.4×107 Newtons is applied to it to solidify it for a period of time to form a straw fiber shaped slab; (7) curing and demoulding: the straw fiber shaped slab is unlocked and the straw fiber shaped slab is taken out from the pad; (8) drying: the straw fiber shaped slab is placed in an infrared circulation drying oven and dried for 15 to 35 seconds to obtain an environmentally friendly flame retardant slab. Straw board semi-finished product; (9) Semi-finished product sawing: trimming the homogeneous straw core board semi-finished product according to actual needs to obtain environmentally friendly flame-retardant straw board semi-finished product of corresponding length and width; (10) Sanding: polishing the environmentally friendly flame-retardant straw board semi-finished product after sawing with a sanding machine to obtain the environmentally friendly flame-retardant straw board finished product; (11) Packaging and warehousing: quality inspection of the environmentally friendly flame-retardant straw board finished product, and packaging and warehousing of qualified products; wherein, the raw material composition of the flame retardant in step (2) includes magnesium oxide, magnesium chloride, magnesium sulfate, nano antimony oxide and ultrafine silicon powder, and the binder is an inorganic binder, and its raw material composition includes aluminum sol, water glass, polyvinyl alcohol and deionized water.