7537results about How to "Improve water absorption" patented technology

An absorbent cellulosic sheet having variable local basis weight includes a papermaking-fiber reticulum provided with (i) a plurality of cross-machine direction (CD) extending, fiber-enriched pileated regions of relatively high local basis weight interconnected by (ii) a plurality of elongated densified regions of compressed papermaking fibers. The elongated densified regions have relatively low local basis weight and are generally oriented along the machine direction (MD) of the sheet and have an MD / CD aspect ratio of at least 1.5. The products are most preferably prepared by way of a compactive dewatering / wet crepe process.

The invention discloses gravel attapulgite flower ceramsite. The key point of the technical scheme is that the gravel attapulgite flower ceramsite consists of high-viscosity attapulgite clay powder, attapulgite clay tailing powder, red bentonite powder, sludge, kieselguhr tailing powder and rice husk powder.t. The gravel attapulgite flower ceramsite is produced by the following steps of mixing the ingredients, pelleting, baking, cooling, smashing, sieving and packaging. The gravel attapulgite flower ceramsite is an irregularly-shaped granule, and has a rough and porous surface, light weight, high strength and high water absorption. The gravel attapulgite flower ceramsite can be soaked in water without being cracked and release nutrition required by flowers continuously and slowly. The gravel attapulgite flower ceramsite is produced by utilizing the sludge and tailings comprehensively, so that the utilization rate of resources is improved, waste materials are changed into wealth, and environment is protected. Besides, the gravel attapulgite flower ceramsite is suitable for planting the flowers and vegetables.

A support member such as a belt or sleeve includes a topographical pattern on its sheet contact side. A plurality of land areas, corresponding depressions, through voids, and / or groove areas are formed on the top surface of the support member to produce the topographical pattern. The land areas, corresponding depressions, through voids, and / or groove areas may be formed by graving, cutting, etching, embossing, mechanical perforation or a combination thereof. The improved belt or sleeve imparts desired physical characteristics, such as bulk, appearance, texture, absorbency, strength, and hand to a nonwoven product produced thereon.

The invention relates to a halogen-less high frequency resin composition, and a prepreg and a laminate manufactured by using the same. The halogen-less high frequency resin composition comprises the following components based on weight part of the organic solids: (A) 10 to 50 parts of styrene-maleic anhydride oligomer; (B) 10 to 50 parts of at least one compound containing dihydro-benzoxazine ring; (C) 10 to 50 parts of at least one polyepoxide; and (D) 5 to 30 parts of at least one phosphorus-containing flame retardant. The prepreg and the laminate manufactured by using the halogen-less highfrequency resin composition has low dielectric constant, low dielectric loss factor, high glass transition temperature, good heat resistance, low water absorbance, and simple and convenient technological operation.

A process is disclosed for producing with good productivity a cross-linked polyaspartic acid resin having biodegradability and high water absorbency. The process features inclusion of one of the following steps: (a) a polysuccinimide, which has been brought into a dispersed state by a dispersant, and a cross-linking agent are reacted to produce the cross-linked polyaspartic acid resin; (b) imide rings of a cross-linked polysuccinimide are subjected to a hydrolysis reaction while controlling a swelling degree of a resulting gel, whereby the cross-linked polyaspartic acid resin is produced; and (c) a gel of a cross-linked polysuccinimide, which has been obtained by reacting a cross-linking agent to a solution of a polysuccinimide in an organic solvent, is disintegrated to subject imide rings of the cross-linked polysuccinimide to a hydrolysis reaction, so that the cross-linked polyaspartic acid resin is produced. The process may also include one or both of the following steps as needed: (d) a gel of the cross-linked polyaspartic acid resin is washed with water and / or a water-miscible organic solvent; and (e) the polysuccinimide is produced using a basic amino acid as a cross-linking agent.