875results about How to "Fast water absorption" patented technology

The invention relates to biocompatible modified starch sponge and use of the biocompatible modified starch sponge as a hemostatic material, an anti-adhesion material, a material for promoting tissue healing, a surgical sealant or a wound tissue adhesive. Modified starch is one or a combination of more than one among pre-gelatinized starch, acid modified starch, dextrin, oxidized starch, esterified starch, etherified starch, crosslinked starch, grafted starch and composite modified starch. The sponge is prepared by vacuum freeze drying of the modified starch and other biocompatible hemostatic material, coagulant, plasticizer and so on. The biocompatible modified starch sponge has the advantages that the biocompatible modified starch sponge has flexible form and good biocompatibility, can be directly acted on bloody wound surfaces, avoids the conditions of hypersusceptibility, infection and difficult healing of wounds caused by adoption of hemostatic materials such as animal source / human source collagens, obviously improves the water absorption speed, has larger viscosity, forms a zymoplastic mixture which has good adhesion, calks broken tissues and blood vessels, and is used for hemostasis of active hemorrhage.

The preparation process of high water absorption resin includes following steps: neutralizing acrylic acid monomer with alkali solution to 60-90 % neutralizing degree, adding functional monomer in 0.5-50 % of total monomer weight, water soluble initiator or oxidation-reduction system in 0.05-0.5 % and water soluble cross-linking agent in 0.005-0.2 %; feeding the said mixed liquid into reactor, adding non-polar organic solvent in 2-10 times the volume of the mixed liquid and containing non-ionic surfactant, stirring to form inverse suspended polymerizing system; heating to 35-80 deg.c for free radical cross-linking copolymerization while adding oil soluble cross-linking agent in 0.005-0.3 % total monomer weight; dewatering after finishing polymerization, separation and drying to obtain the high water absorption resin. The obtained polyacrylate resin has the advantages of powerful water absorption, high salt tolerance, high gel strength and fast water absorption speed.

The invention relates to cat litter prepared from dry bean dregs and a preparation method thereof, wherein the cat litter is used for burying excrement and urine of pets. The cat litter is prepared from the following components through a series of processes including crushing, mixing and forming according to weight ratio: 5-90 parts of dry beam dregs, 10-90 parts of plant adhesive, 20-80 parts of filling agent, 0.1-10 parts of releasing agent, 0.1-5 parts of surface active agent, 0.01-3 parts of preservative, and 1-10 parts of deodorant. According to the invention, the cat litter prepared by the preparation method provided by the invention has the advantages of being wispy and hollow in surface, low in structural density, light in weight, higher in water absorption speed and better in water absorption performance; compared with other cat litters, the cat litter has the advantages of being more saving in use amount and higher in cost performance; after being used, the cat litter can be directly washed away through a sewer and cannot be blocked; the cat litter is convenient to clean; and the cat litter provided by the invention has the advantages of being environment-friendly, non-toxic, pollution-free, strong in absorption performance, simple in production process and free from wispy dust in production and transportation processes and has a deodorization function.

The invention discloses a macromolecule material cold keeping agent making method which consists of, preparing aqueous solution of polymers having strong hydrophilic radicals in the molecular structure, charging propenoic acid, hydroxyethyl methacrylate and maleic anhydride monomer, mixing homogeneously, charging bis-ethyl acrylate cross linking agent, agitating homogeneously, charging potassium peroxodisulfate initiating agent, mixing homogeneously, obtaining macromolecular material, dissolving into water of different mass.

The invention discloses a manufacturing method of an ice bag for preserving biological products. The manufacturing method comprises the following steps: 1) adding a thickener into hot water or boiling water, and fully stirring till dissolution; 2) adding high molecular water-absorbing resin into a solution in the step 1) while hot, stirring, then standing to carry out full reaction and imbibition on the high molecular water-absorbing resin and the thickener, and forming a gelatinous solid, wherein the reaction time is 5-30minutes; and 3) bagging the gelatinous solid in the step 2), cooling, and then placing into a cold storage, a refrigerating cabinet or a refrigerator at the temperature of -10 DEG C to -20 DEG C for freezing for above 12hours. The invention provides a simple, convenient and high-efficient manufacturing method of a high molecular cold storage agent, namely the manufacturing method of the ice bag for preserving the biological products. The prepared cold storage agent has the advantages of high repeatability, great freezing-thawing phase change latent heat, long cold storage time and fast water absorption speed, and furthermore, the cost of the process is low; and by changing the added thickener, the different phase change temperatures can be obtained for meeting various different application requirements.

The invention relates to the field of a biomedical material, and particularly discloses a crosslinked alginate-bacterial cellulose sponge and a preparation method thereof. The crosslinked alginate-bacterial cellulose sponge takes an alginate biomaterial and bacterial cellulose as raw materials. The crosslinked alginate-bacterial cellulose sponge is characterized in that a sponge product is prepared from the alginate biomaterial and the bacterial cellulose in manners of crosslinking and freeze-drying after being compounded, wherein the alginate biomaterial accounts for 80-95% of the sponge product in mass fraction; the bacterial cellulose accounts for 5-20% of the sponge product in mass fraction. The crosslinked alginate-bacterial cellulose sponge is abundant in used material sources, low in cost, controllable to process, and simple in production technology; the prepared crosslinked alginate-bacterial cellulose sponge has good mechanical property, liquid absorption property, water retention capacity and air permeability, and is applicable to bleeding healing of large seepage or a bleeding wound.

The invention discloses a preparation method of an accellular epimatrix, the accellular epimatrix prepared by the preparation method and application of the accellular epimatrix in the field of preparation of medical instruments. The preparation method of the accellular epimatrix comprises the following steps: carrying out pretreatment on tissues and organs of mammals to obtain an analogy tissue precursor; separately carrying out virus inactivation treatment, DNA eliminating treatment, accellular treatment and defatting treatment on the analogy tissue precursor to obtain an accellular epimatrixprecursor; and successively carrying out gradient dewatering treatment and crosslinking treatment on the accellular epimatrix precursor, and finally shaping and drying to obtain the accellular epimatrix. By the gradient dewatering treatment, the accellular epimatrix precursor is soaked in organic matter solutions of which the concentrations are successively increased successively. According to the preparation method of the accellular epimatrix, the tissue precursor is treated through gradient dewatering, and thus, the orderly structure of collagenous fibers of the finally prepared accellularepimatrix is not damaged.

The invention provides a double-layered composite biological dressing and an adhesive-free compound technology thereof. The double-layered composite dressing comprises a chitosan fiber non-woven fabric layer and a spongy-shaped functional layer, wherein no adhesive is needed to bond the two layers. The preparation technology comprises the following steps: (1) chitosan fiber non-woven fabric is pre-cooled; (2) macromolecule chitosan, macromolecule collagen protein, micromolecule collagen protein and micromolecule chitosan in mass ratio of 0.7-1.3 to 0.1-0.3 to 0.7-1.3 to 0.1-0.3 are added in a faintly acid aqueous solution to prepare a spongy layer material solution; (3) the pre-cooled chitosan non-woven fabric is taken out and the spongy layer material solution is rapidly and uniformly sprayed on the non-woven fabric, wherein the spraying amount is 20-60 ml / 20*20 cm<2>; (4) the chitosan non-woven fabric sprayed with the spongy layer material solution is freeze-dried. The prepared double-layered composite dressing is firm in embedding connection between the two layers; the spongy functional layer has the function of promoting wound healing and prevents adhesion; the chitosan fiber non-woven fabric layer has the functions of favorable air permeability, comfort and bacterium resistance.

The invention relates to an organic-inorganic composite water-absorbing material based on polyaspartic acid and nano montmorillonite and a preparation method thereof. The preparation method of the composite material can be carried out by two modes such as an in-situ polymerization method and physical blending and modification. In the in-situ polymerization method, a product is prepared by carrying out in-situ polymerization on montmorillonite and L-aspartic acid of polyaspartic acid monomer, and comprises the following components in parts by weight: 100 parts of L-aspartic acid and 2-10 parts of nano montmorillonite. In the blending and modification of the polyaspartic acid / nano montmorillonite, the improvement on the mechanical performance of polyaspartic acid resin is realized by the modification action of the montmorillonite on the polyaspartic acid, and the obtained product comprises the following components in parts by weight: 100 parts of polyaspartic acid and 2-15 parts of nano montmorillonite. The high-performance polyaspartic acid / nano montmorillonite composite material provided by the invention has the advantages of convenience in preparation, excellent water-absorbing performance, high water-absorbing rate, strong repeated water-absorbing capability, good salt resistance and high impact resistance and the like, and can be used for the fields of high-molecular water-absorbing materials and sand fixing agents and the like.