215 results about "Swelling capacity" patented technology

The present invention provides: a novel water-absorbing agent, which exhibits an excellent absorption capacity under a load (AAP), gel layer liquid permeation rate under a load (FRUP), saline flow conductivity (SFC), and shape-maintaining property and ball burst strength (BBS) of a swollen water-absorbing agent aggregate, and excellent persistency of these effects for a long time. The water-absorbing agent, which comprises a polymer obtained by a process including the steps of polymerizing and then crosslinking a monomer including acrylic acid and/or a salt thereof, with the water-absorbing agent being characterized by: (1) exhibiting a free swelling capacity of not less than 23 g/g (GV), a gel deformation of not more than 12.5 cm under a short-time load (0.5 hrPT), and a gel deformation deterioration of not more than 3.5 cm under a load with the passage of time (ΔPT); (2) exhibiting a free swelling capacity of not less than 23 g/g (GV), a ball burst strength of not less than 80 gf (BBS), and a deterioration of ball burst strength of not more than 40% (DBBS); or (3) exhibiting a free swelling capacity of not less than 23 g/g (GV), an absorption capacity of not less than 20 g/g under a load of 4.9 kPa (AAP), and a gel deformation of not more than 12.5 cm under a load (16 hrPT).

Through the combination of at least two polymer families, and the optimization of other components, a rubber compound has been developed for use in downhole applications that will swell in water-based fluids. A cellulose component, such as carboxy methyl cellulose (CMC), is used together with an acrylate copolymer (AC) that can increase the swelling capacity of an acrylonitrile butadiene rubber (NBR) in water to over 1000%. The amount of swelling achieved depends on physical boundaries and limitations, the salinity of the water, and the temperature.

The invention relates to an implant having a base body consisting completely or partially of a biocorrodible metallic material, the material being such that it decomposes in an aqueous environment to yield an alkaline product and the base body has a coating comprising or containing a hydrogel, characterized in that the hydrogel has a reduced swelling capacity at an elevated pH.

A catheter tubing (2) consists of a composite comprising a first material (54) which mainly consists of a hydrophilic plastic material which absorbs moisture and which therefore swells in contact with e.g. blood, and a second material which essentially does not absorb moist but which forms reinforcing longitudinal strands (55) in the catheter tubing, which counteract that the catheter tubing is extended or becomes thicker because of the swelling capacity of the first polymeric material, such that the volume increase of the hydrophilic, first plastic material substantially results in an increase of the circumference of the tubing and hence of its diameter and flow area. A catheter is made of a catheter tubing of that type and can be included in an assembly (1) comprising a hub (4) having a front portion (11) provided with a pair of wings (29) extending outwards from the hub. The wings can be folded against one another in order to serve as a gripping member (7) provided adjacent to the catheter when the catheter is being inserted into a fistula (40), whereupon they can be brought to contact and be releasably adhered to the skin of a patient.

A water insoluble, water swellable absorbent composition exhibiting a free swell absorbency of at least 15 g/g and an Absorbency Change of greater than or equal to 15% upon saturation. The absorbent composition includes both permanent crosslinking points and transitional crosslinking points. The absorbent composition has a high free swell capacity as well as a high absorbency under load.

The invention relates to a method for preparing nano composite hydrogel with good mechanical property, which is characterized by comprising the following steps: firstly, an anhydrous monomer and physical crosslinking agent inorganic clay are dispersed in deionized water, nitrogen enters into a closed container under the condition of normal temperature and normal pressure, and then the mixture is stirred; secondly, an initiator is added, stirring is continued under the condition of normal temperature and normal pressure, and a hydrogel solution is prepared; and thirdly, the solution undergoes free radical polymerization reaction at a certain temperature, and then a reactant is immersed in the deionized water so as to prepare the nano composite hydrogel with good mechanical property. The method has the advantages that: not only the preparation technique is simple but also the gel prepared simultaneously has good transparency, hydroscopic and swelling capacity, and mechanical property.

The invention discloses ethanol gasoline, which is characterized by consisting of the following raw materials in part by volume: 60 to 70 parts of regular gasoline, 2 to 10 parts of absolute ethanol, 10 to 20 parts of latent solvent, 13 to 23 parts of surfactant, 10 to 15 parts of combustion improver, 3 to 10 parts of corrosion inhibitor and 7 to 15 parts of detergent dispersant. The invention also discloses a preparation method of the ethanol gasoline. The ethanol gasoline has the advantages of high storage stability, high intersolubility, no corrosion, no swelling capacity and readily available raw materials, can be used together with other alcohol automobile gasoline such as methanol gasoline and the like in any ratio, and also can be directly used with common gasoline of the same standard in any proportion; the octane level reaches or exceeds the standards of No. 93 and No.95 clear gasoline; and the overall performance of the ethanol gasoline can meet standard requirements of the No.93 clear gasoline.

An apparatus and method transfer imaging material using a release layer having a bulk swelling capacity between 120% and 145% in Isopar L.

The invention relates to the technical field of fracturing fluid used in a compression fracture yield increasing process of an oil well or a natural gas well, in particular relating to super guar gum foamed fracturing fluid injected with liquid nitrogen for a low-permeability gas reservoir. The preparation method of the super guar gum foamed fracturing fluid comprises the following steps: homogeneously mixing a base solution with a crosslinking solution to obtain a semi-finished product of the super guar gum foamed fracturing fluid; and adding a viscosity breaking agent and injecting liquid nitrogen into the semi-finished product to obtain the super guar gum foamed fracturing fluid injected with liquid nitrogen for on-site construction. The super guar gum foamed fracturing fluid provided by the invention has the advantages of good swelling capacity, stable nature of foam, low content of fracturing fluid residue and good viscosity breaking performance, and can be used for reducing the damage to reservoir bed, increasing the strata energy after fracturing, and improving the flowback efficiency.

The invention belongs to the technical field of materials, and particularly relates to a method for preparing a through-hole polymer porous aquagel by using graphene oxide (GO). The method mainly comprises the following steps: carrying out surface modification on hydrophilic GO by using an oleophylic modifier, wherein the modified GO is used as a stabilizer of a Pickering emulsion; and adding a monomer, a crosslinking agent, an initiator and a pore-forming agent, emulsifying to obtain an oil-in-water high-inner-phase emulsion, and carrying out continuous phase polymerization on the high-inner-phase emulsion to obtain the through-hole-structure polymer porous aquagel. The method has the advantages of simple preparation process and lower cost. The prepared through-hole polymer porous aquagel has the advantages of controllable pore structure, large pore size (5-200 mu m), large interconnection size (2-70 mu m), favorable permeability, favorable swelling capacity and favorable adsorbability.

The invention discloses a method for lowering ash content of polyacrylonitrile-based carbon fiber. A PAN (Polyacrylonitrile) spinning solution with higher hydrophilism is prepared on the basis of a quaternary ammoniated modification copolymerization system. A PAN-based raw silk with high structural compaction degree, good mechanical performance and low ash content is prepared by virtue of key control of swelling capacity before applying oil agent on the raw silk, introducing a low-silicon oil agent and controlling the oil content of the silk flock. The carbon fiber ash content and the raw silk ash content have linear relation, and are matched with a certain charring process for charring the raw silk to obtain the carbon fiber with low ash content.

The invention relates to a method for conducting wool textile anti-felting treatment through a two-bath process by using imidazolium chloride ionic liquid/protease, belonging to the application field of wool fabric dyeing and finishing in the wool textile industry. The method is characterized in that chloroform/methanol is used to extract impurities on the surface of the fabric first, then the strong dissolving/swelling capacity of the imidazolium chloride ionic liquid is used to modify the surface layer of wool yarn scales and finally protease is used to trim the fabric to obtain the goal of improving the anti-felting effect of the wool fabric treated by using protease. Moreover, the ionic liquid used for pretreatment can be repetitively utilized after the ionic liquid is distilled under reduced pressure, so the environmental pollution is reduced. The invention solves the problems that the anti-felting effect of the wool fabric treated by using the existing single protease is bad and serious pollution is caused by the DCCA/protease anti-felting technology.

The invention provides a methanol gasoline-resistant rubber material. The methanol gasoline resistant swelling capacity of the rubber material is further enhanced on the premise of satisfying the comprehensive performance of rubber. The rubber material is prepared from various materials such as novel fluorine rubber, an acid absorbing agent, a reinforcing filler, a vulcanizing agent, an accelerant, a plasticizing agent and the like. The rubber material specifically comprises the following components in parts by weight: 100 parts of ternary polymerized fluorine rubber (FKM), 5-20 parts of acid absorbing agent, 0.5-5 parts of vulcanizing agent accelerant, 5-80 parts of reinforcing filler, 0-10 parts of plasticizing agent and 1-5 parts of vulcanizing agent. The rubber material has excellent methanol gasoline resistance. An O-shaped sealing ring and a rubber pipe for a fuel system of a vehicle made of the rubber material have high methanol gasoline resistant swelling capacity.

The invention relates to an application of a hyaluronic acid and a salt thereof as well as a cross-linked hyaluronic acid and a salt thereof in preparation of drugs for treating and preventing seawater immersion injuries, water injuries and complications thereof. The hyaluronic acid and the salt thereof and the cross-linked hyaluronic acid and the salt thereof, having proper swelling capacity, excellent sea water insulating effect, skin adhesion in water and blood hemostatic function, can form a protective layer on the wounds to realize rapid insulation of hemostasis from sea water and, therefore, can be used to prevent and treat seawater immersion injury caused by immersion of wound in seawater and complications thereof and to promote wound healing.

The invention discloses novel collagen composite fiber mainly comprising collagen and a small amount of Na-MMT, and a spinning technical method thereof. The proportion of collagen and Na-MMT in the composite fiber counted in portion by dry weight is 10,000:1-100. The main preparation method of the composite fiber comprises: stirring and mixing 15 to 50 weight percent collagen solution and 0.1 to 2 weight percent Na-MMT solution according to a set proportion under a water bath condition between 50 and 80 DEG C; carrying out hot filtration at a temperature between 50 and 80 DEG C after the solutions are evenly mixed; obtaining spinning solution used to imitate collagen-Na-MMT composite fiber after defoaming; extruding the spinning solution through a spinneret under the action of gas pressure at a temperature between 50 and 80 DEG C; and entering inorganic salt coagulation bath to prepare the collagen-Na-MMT composite fiber through solidification. In addition, the intensity, swelling capacity, water absorption, and the like of textile composite fiber can be improved through post treatments such as acetalation and oiling. The collagen-Na-MMT composite fiber can be used for textile materials and biomedical materials.

The invention discloses a hydrogel dressing, comprising water-soluble polymer, water-soluble chitin derivatives and solvent. The invention also discloses the method for preparing the hydrogel dressing, which is as follow: firstly, irradiation, secondly, circulation of freezing and unfreezing. The hydrogel dressing has the advantages of high transparency, large swelling capacity, high strength, low water evaporation rate, functions of antibacterial, anti-inflaminatory, hemostasis and promoting wound healing, no additive, and ability of providing a good healing environment for wound. The preparation method has the advantages of simple method, less time consumption, high efficiency, and ability of preparing the hydrogel dressing with high transparency, large swelling capacity and high strength.

Provided is a water-absorbing agent having enhanced performance in both the centrifuge retention capacity and the absorption against pressure (particularly, the vertical diffusion absorption amount) of a water-absorbing resin, and also, a water-absorbing agent which can provide an absorbent core having a large absorption amount in a diaper, having improved diffusibility and liquid permeability, and having a smaller re-wet amount, is provided at low cost.

Disclosed is a particulate water-absorbing agent containing a surface-crosslinked polyacrylic acid (salt)-type water-absorbing resin as a main component, and containing at least one spacer selected from a polycation and water-insoluble fine particles, the particulate water-absorbing agent satisfying an free swell capacity (FSC) of 55 to 65 [g/g], an absorption against pressure (AAP—4.83 kPa) of 20 to 30 [g/g], and a vertical diffusion absorption amount under pressure (VDAUP—4.83 kPa) of 30 to 80 g.

The kelp diet fiber product is white powder extracted from kelp dreg and has fiber content of 50-94 %, water maintaining capacity of 700-2100 %, swelling capacity of 10-30 ml/g, high purity and activity. The production process includes collecting flocculate, adding acid to eliminate calcium, alkali treatment, bleaching, washing, and drying and crushing into 160-200 mesh. The production process is simple, full in utilizing kelp and low in cost, and has less waste water drainage, non-toxic bleaching agent with sterilizing function used. The product is good for health.

The invention discloses a method for continuously producing jelly of ultra-high molecular weight polyethylene porous membrane, which is characterized in that the method uses the following steps to complete manufacture continuously: (1) mixing ultra-high molecular weight polyethylene, solvent, and additive into homogeneous material; (2) preparing obtained homogeneous material into jelly membrane; (3) stretching the obtained jelly membrane along two directions to prepare jelly thin membrane; (4) dragging the obtained jelly thin membrane to an extraction tank, removing the solvent by extracting agent, and preparing porous thin membrane; (5) drying; and (6) dragging membrane along two directions to carry out heat shaping, preparing the porous membrane, and finally winding the membrane into a roll. The method for continuously producing jelly of ultra-high molecular weight polyethylene porous jelly membrane can produce continuously and can be controlled easily, the prepared porous membranes features high strength, strong corrosion resistance, low density, low temperature resistance, high alcohol resistance, strong anti-swelling capacity, thereby being widely applied to proton exchange membrane fuel cells, capacitor isolation membrane, various separation membranes and water treatment membrane and other fields.

The invention discloses insoluble dietary fiber of raisin tree and a preparing method thereof. The raw material is raisin tree fruit or fruit residue thereof after brewing, vinegar production, sugar production, beverage production or active pharmaceutical ingredient extraction. According to the impurity in the raw material and the content, one or a plurality of methods of washing, acid treatment, alkali treatment and decoloring and the like are adopted to remove the impurity, and then dehydrating, drying and superfine grinding are executed. The prepared insoluble dietary fiber of raisin tree is light yellow or ivory powder with the average grain size of 10 to 90 Mum, the content of the insoluble dietary fiber is 50 percent to 100 percent, the retention ability is 1 to 10g/g, the liposuction ability is 1 to 10g/g, the swelling capacity is 1 to 10 mL/g, and the cation exchange resin capacity is 1 to 7 mmoI/g. The insoluble dietary fiber of raisin tree can be used for preparing food, functional food or medicines, or be taken as raw material or auxiliary material of food, functional food or medicines. The method for preparing the insoluble dietary fiber of raisin tree is simple, the production equipment is easily-obtained and has low cost, and the method is suitable for industrialized production.

A multicomponent composition for filling and/or grouting cracks, flaws, and cavities in structures or earth and stone formations, including: i) water; ii) cement; iii) an aqueous plastic dispersion; and iv) at least one monomer, which can be radically polymerized, or a polyisocyanate. A material is thus obtained as a sealant, which displays great adjustment capabilities of hardness and reaction time, in addition to its cost-effectiveness. Such a composition unifies positive properties of various materials as a sealant, such as expansion capacity and swelling capacity.

Ionic superabsorbent polymers having increased swelling capacity of salt-containing solutions are disclosed. The ionic superabsorbent polymers of the present invention contain an additive to increase the osmotic activity of the polymer in the presence of a salt-containing solution. The additive used in combination with the ionic superabsorbent polymer is capable of forming a zwitterion at a pH of from about 1 to about 9, has a dipole moment greater than that of water, and has a molecular weight less than about 10,000 grams/mole.

The invention discloses environment-friendly cable filler and its preparation method. The filler is mainly prepared by mixing the following raw materials in proportion: polyvinyl chloride resin, phenolic resin, polypropylene, triallyl cyanurate, a silane coupling agent, titanate, zinc oxide, straw ash, graphite, calcium carbonate, an antiager, a fire retardant and lead silicate. The environment-friendly cable filler provided in the invention has the advantages of stable chemical structure, indecomposability by microorganism, good gelling performance, high swelling capacity, and can improve electric properties of cables, extend cable service life, and save resources.