6results about "Pulping with halogen compounds" patented technology

The present invention belongs to the technical field of cellulose. Disclosed are a modified fiber fabric and a preparation method therefor, which solve the technical problem in the prior art of sodium and potassium remaining on a water-absorbing material in CMC-H modified fiber products and thus affecting the biocompatibility of the water-absorbing material. In the modified fiber fabric and the preparation method therefor provided by the present invention, the fiber fabric raw material sequentially modified into carboxymethyl cellulose and subjected to an ammoniation treatment with ammonia gas on the basis of maintaining a fibrous shape, so as to obtain the fiber fabric with ammonium carboxymethyl cellulose as the modified material; the fiber fabric raw material is subjected to a modification treatment reaction on the basis of maintaining the fibrous shape, specifically, during the modification treatment reaction, in fiber molecules of the fiber fabric raw material, 1,4-glucosidic bonds in glucose molecules are linked to form parallel cellulose chains without changing, and specific chemical groups occupying specific carbon positions C6, C2 and C3 on the molecular chains of fibers are subjected to a modification reaction, thereby ensuring the softness and physical properties of the product paper or non-woven fabric.

A process to manufacture dissolving pulp grade cellulose said process comprising the steps of: o providing a lignocellulosic material; o optionally, comminuting said lignocellulosic material into chips of a particle size no greater than 5 cm o providing a modified Caro's acid, wherein said modified Caro's acid o exposing said lignocellulosic material to said modified Caro's acid at a temperature of less than or equal to 45°C for a period of time sufficient to allow the modified Caro's acid to delignify said lignocellulosic material and yield a solid cellulosic portion and a liquid portion with a high dissolved lignin content; o separating said solid cellulosic portion from said liquid portion; wherein said solid cellulosic portion has the following characteristics: o lignin content below 1%; o hemicellulose content below 15%; and o cellulose content of at least 75%; - exposing said solid cellulosic portion to a caustic solution yielding causticized solids; - filtering said causticized solids; - re-slurrying said causticized solids and neutralizing such to yield a dissolving pulp cellulose; and - washing said dissolving pulp cellulose with water to remove the neutralized salts to obtain a high purity dissolving pulp cellulose having the following characteristics: o over 90% cellulose content; o less than 1% lignin content; o less than 5% hemicellulose content; and o an intrinsic viscosity ranging between 100 – 800 mL / g.

A process to manufacture dissolving pulp grade cellulose said process comprising the steps of: o providing a lignocellulosic material; o optionally, comminuting said lignocellulosic material into chips of a particle size no greater than 5 cm o providing a modified Caro's acid, wherein said modified Caro's acid o exposing said lignocellulosic material to said modified Caro's acid at a temperature of less than or equal to 45°C for a period of time sufficient to allow the modified Caro's acid to delignify said lignocellulosic material and yield a solid cellulosic portion and a liquid portion with a high dissolved lignin content; o separating said solid cellulosic portion from said liquid portion; wherein said solid cellulosic portion has the following characteristics: o lignin content below 1%; o hemicellulose content below 15%; and o cellulose content of at least 75%; - exposing said solid cellulosic portion to a caustic solution yielding causticized solids; - filtering said causticized solids; - re-slurrying said causticized solids and neutralizing such to yield a dissolving pulp cellulose; and - washing said dissolving pulp cellulose with water to remove the neutralized salts to obtain a high purity dissolving pulp cellulose having the following characteristics: o over 90% cellulose content; o less than 1% lignin content; o less than 5% hemicellulose content; and o an intrinsic viscosity ranging between 100 – 800 mL / g.

The invention belongs to the technical field of papermaking, and particularly relates to cardboard paper and a preparation method thereof. The cardboard paper is prepared from the following raw material components: slurry, polyaluminum chloride, a dry strength agent, a multifunctional additive, a GCC wrapping agent and a surface sizing agent. The preparation method of the cardboard paper comprises the following steps: preparing pulp from bamboo fibers and waste paper fibers, wherein the pulp is divided into surface pulp, core pulp and bottom pulp; sequentially and respectively adding polyaluminum chloride, a dry strength agent and a GCC wrapping agent into the surface pulp, the core pulp and the bottom pulp, stirring and uniformly mixing; then adding the multifunctional additive into the core pulp and the bottom pulp, stirring and uniformly mixing; the surface pulp, the core pulp and the bottom pulp are respectively screened out to obtain accepted pulp, and the accepted pulp is sequentially subjected to the procedures of net feeding, squeezing, pre-baking, surface sizing, post-baking, press polishing and curling to obtain the product. The method can meet the requirements of production indexes, and solves the problems of poor national waste quality, shortage of American waste raw materials and high production cost.

The invention discloses a multifunctional composite modified straw fiber with high water absorption and growth promotion and a matrix block, and relates to the technical field of rice seedling raising matrixes. The composite modified straw fiber is obtained by mixing choline chloride, formic acid, eugenol, metal salt, straw segments and a precipitation accelerator, dipping, steaming in a hydrothermal environment at 100-120 DEG C, and mechanically defibering and separating fibers by using a twin-screw extruder or a single-shaft tearing thread rolling machine, the composite modified straw fiber can be directly subjected to suction filtration forming to prepare a single-layer matrix block, and can also be sprayed with dark brown liquid to prepare a multi-layer matrix block through a discrete interweaving paving dry method; the straw fiber has the characteristic of high water absorption, the surface of the straw fiber is rich in cerium-zinc-silicon fertilizer and active mineral elements after dissociation, when the prepared matrix block is used for rice seedling raising, the growth and development of seedlings can be remarkably promoted, the stress resistance can be enhanced, the co-produced dark brown liquid can be used as a foliage spray or soil conditioner, the crop resistance and the soil structure can be improved, and the yield of rice seedlings can be increased. And a green value-added product is provided for agricultural production.

In a first aspect, the invention relates to a fiber production method comprising the delignification of bamboo fibers. The bamboo fibers comprise or consists of separated bamboo technical fibers, each bamboo technical fiber comprising plural elementary bamboo fibers. In a further aspect, the invention relates to bamboo technical fibers obtained from the method.