Abrégé

Disclosed is a functional cornstalk board and a preparation method thereof. The functional cornstalk board of the present invention includes 1 to 10 parts by weight of a curing agent, based on the total weight of the mixture of 6 to 10 parts by weight of cornstalk and 0.2 to 2 parts by weight of a binder or silicate, wherein the functional cornstalk board is obtained by molding the raw material at a molding temperature of 120 to 210 °C and a molding pressure of 10 to 30,000 kg /cm3 for a molding time of 0.5 to 20 minutes using the semiautomatic or multistage automatic heat press device. The functional cornstalk board of the present invention is a cornstalk plywood material having a bending strength of 300 to 750 kg /cm3, a density of 0.5 to 0.8 g/cm3, and capable of manufacturing the cornstalk plywood material into various shapes and desired standards of a woodcut, scantling, plywood, construction materials and a slate due to its easy molding by the pressure and the extrusion, and therefore the functional cornstalk board may be environment-friendly, mass-produced and economical since the cornstalk is used as the unlimited resource without adversely affecting the forests so as to obtain woods or plywoods, and particularly it may be light in weight, easily processed in molding and cutting, and also used for application products into which the colors are added.

Classes IPC  ?

• B27K 9/00 - Traitement chimique ou physique du roseau, de la paille ou de matériaux similaires
• B27J 1/00 - Travail mécanique du jonc ou des matériaux similaires

Abrégé

The present invention relates to a manufacturing method of mechanical pulp from stalks of corn, an annual plant, by adding a digesting agent and, prior to, during or following addition of the digesting agent, completely separating fibrous material from the cornstalks by mechanical refining. The method of the present invention comprises: (1) a first digesting process of adding 0.5-5 parts by weight of a digesting agent selected from caustic soda, sodium carbonate, sodium sulfite, sodium bisulfite, sodium sulfide, sodium oxide and sodium sulfate, or a digesting agent selected from a mixture of more than one of each to 100 parts by weight of crushed cornstalks, and of separating and digesting the solid substance after impregnating of the mixture; (2) a second digesting process of adding 5-10 parts by weight of more digesting agent to the digested solid substance obtained from the first digesting process, and of separating and digesting the solid substance after impregnating of the mixture; and a refining process of separating the solid substance to be digested and refining it mechanically, which is performed prior to, during or following the second digesting process.

Classes IPC  ?

• D21C 3/06 - Réduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide anhydride sulfureuxRéduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide acide sulfureuxRéduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide bisulfites

Abrégé

The present invention relates to a method for producing mechanical pulp from stalks of corn, an annual plant. Pulping and bleaching are performed simultaneously by adding a salt compound selected from a group consisting of sodium carbonate, sodium bicarbonate, sodium sulfite and a mixture thereof along with hydrogen peroxide. In accordance with the present invention, superior brightness can be attained without additional bleaching process. In case a post-bleaching is required, the process can be significantly simplified. In particular, the problems of decomposition of hydrogen peroxide by strong alkali, e.g., caustic soda, and scale formation caused by sodium silicate can be solved. The manufacturing method of mechanical pulp from cornstalks in accordance with the present invention comprises: (1) a mechanical pulping process of adding 0.2-20 parts by weight of a salt compound selected from a group consisting of sodium carbonate, sodium bicarbonate, sodium sulfite and a mixture thereof to 100 parts by weight of cornstalk chips and refining the mixture for 5-240 minutes; and (2) a filtration process of filtering the mixture to obtain pulp.

Classes IPC  ?

• D21C 3/06 - Réduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide anhydride sulfureuxRéduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide acide sulfureuxRéduction en pâte des matières contenant de la cellulose avec des acides, des sels acides ou des anhydrides d'acide bisulfites