71results about How to "Improve hydrophilic performance" patented technology

The invention discloses hydrophilic polyethylene hollow fiber microporous membrane and preparation process thereof. Said membrane is characterized in that it mainly comprises polyethylene, amphoteric copolymer containing polyethylene oxide, and inorganic nano particles. The membrane preparing process is carried out based on thermally induced phpase separation and surface segregation principles, comprising the steps of (1) preparing membrane blank by fusion and blending of amphoteric copolymer containing polyethylene oxide, diluent, and inorganic nano particles; (2) preparing hollow fiber membrane precursor by hollow process spinning of membrane blank in molten state; (3) extracting diluent in hollow fiber membrane precursor by using organic solvent to obtain said hydrophilic polyethylene hollow fiber microporous membrane, wherein the porosity of said membrane is between 40% and 80%, and average pore diameter is between 0.1mum and 5.0mum. The microporous membrane in the invention has the characteristics of high hydrophilicity, narrow pore size distribution, high strength, and good chemical stability, and serves as micro-filtration and ultra-filtration membrane material with high performance, low cost, pollution resistance, and long serve life for water treatment.

The invention discloses a polyester flat microporous membrane and a preparation method thereof. The microporous membrane comprises the following materials in percentage by mass: 60-99.9% of polyester and 0.1-40% of modifier; or 20-40% of non-woven fabric, 60-79.9% of polyester and 0.1-30% of modifier. The preparation method is realized on the basis of a thermally induced phase separation process and comprises the following steps: mixing the polyester, the modifier and diluter into a homogeneous solution at high temperature; scraping the homogeneous solution into a liquid membrane, cooling andcuring into a membrane so as to form a precursor membrane subject to microphase separation, and extracting to obtain a flat microporous membrane. The prepared polyester flat microporous membrane is in a spongeous structure with the pore diameter of 0.05-5.0 micrometers and the porosity of 30-80%, and has the advantages of narrow pore diameter distribution, uniform pore size, easily controlled pore size, high strength, symmetrical structure and the like, thereby being a filter membrane material for water treatment and a lithium ion battery diaphragm material with high performance, low cost andlong life.

The invention relates to a cement paste toughening agent and application of the cement paste toughening agent in preparation of a cementing flexible cement paste. The toughening agent is prepared by modification of rubber powder; the modification of rubber powder includes the steps of cleaning, activating, etching and grafting; the cementing flexible cement paste prepared by the toughening agent is prepared from the following components in parts by weight: 100 parts of portland cement, 5-50 parts of modified rubber powder, 10-40 parts of a toughing agent, 15-80 parts of a density regulator, 35-65 parts of water, 0.5-2 parts of a dispersing agent, 0.5-3 parts of a fluid loss agent, 1.5-4 parts of a retarder and 0.1-2 parts of a defoamer. The inherent performance of a substrate is not changed by plasma treatment on the rubber powder; no pollution is generated; the cement paste toughening agent is simple in process, convenient to operate, stable in hydrophilism through the grafted rubber powder, small in effect from timeliness, and low in handling expense; the flexible cement paste prepared from the modified rubber is good in sedimentation stability; the mechanical property is obviously improved; the cement construction requirements of the scene can be completely met.

The invention provides a hydrophilic modification method of PVA to polyester fiber, which belongs to the high-molecular technical field. The method comprises the following steps: pretreating the polyester fiber by a sodium hydroxide solution with 3-10% of mass fraction for 1 hour, wherein the solid liquid ratio is 1: 50, flushing and drying the polyester fiber, then placing the polyester fiber in a reaction container filled with a PVA solution with 0.2-0.3% of mass fraction, then adding acetate, methanol and sulfuric acid according to volume ratio of 3: 2: 1 in the reaction container, wherein the volume fraction of acetate, methanol and sulfuric acid are 10% respectively, adding GA with 25% of mass fraction in the reaction container, wherein the mol ratio of GA to PVA is 1: 4, performing mechanical stirring and reacting for 1-2 hours under the temperature of 50-70 DEG C, washing by water after the reaction is completed, and drying. Through representation and determination, the surface of the modified polyester fiber uniformly contains PVA, the contact angle is less than 10-50 DEG, hydrophilcity of the polyester fiber is greatly improved, the effect is stable, and the polyester fiber can be widely used in the fields of regeneration resource papermaking, clothes, decoration and industry and agriculture.

The invention provides a hydrophilic modification method for a polyester fiber by using sodium alginate, which belongs to the technical field of high polymer. The method comprises the following steps: stirring and pretreating the polyester fiber by using a sodium hydroxide solution with a mass fraction of 3 to 10% in a reaction container at a temperature of 70 to 90 DEG C for 1 h, wherein a solid-liquid ratio is 1: 50, then carrying out flushing with water after completion of a reaction and carrying out drying; and preparing a sodium alginate solution with a mass fraction of 1 to 4%, standing the sodium alginate solution at a temperature of 4 DEG C for 1 h, allowing sodium alginate to expand after sufficient water absorption, placing the sodium alginate solution in the reaction container, adding the dried polyester fiber into the reaction container, carrying out mechanical stirring at normal temperature for 1 to 2 h, adding a calcium chloride solution with a mass fraction of 2% during stirring and after completion of a reaction, successively carrying out flushing with water and then drying at 70 DEG C for 1 h. According to determination results, the contact angle of the modified polyester fiber is less than 10 to 60 DEG, hydrophilicity of the polyester fiber and products thereof are greatly improved, and the modified polyester fiber can be extensively applied to fields like papermaking with renewable resources, clothes, decoration, the industry and the agriculture.

The invention provides a preparation method of a superhydrophilic and underwater-superoleophobic polyacrylonitrile-based oil-water separating membrane. The preparation method comprises the following steps of: adopting acrylonitrile monomer as a main-body raw material, and adopting an aqueous-phase precipitated polymerization method to synthesize a polyacrylonitrile-based copolymer; selecting a crystalline diluting agent, combining with a thermally-induced phase separation method to construct a polyacrylonitrile-based microporous membrane with a micro/nano structure and high flux on the surface, and preparing the superhydrophilic and underwater-superoleophobic microporous membrane by simple modification and grafting, wherein the use of an organic solvent is avoided in synthesis and modification of the process. The oil-water separating membrane prepared by the preparation method has the advantages of high porosity, good pressure resistance, permanent hydrophilia and excellent underwateroleophobic property; in addition, the adhesion to oil drops is very low, the pollution resistance is good, long-time and stable operation can be achieved, and high-efficiency separation from an oil-water mixture to oil-in-water type oil-water emulsion can be realized only by means of gravity or lower pressure.

The invention discloses a compound finishing agent for improving the antistatic performance of polyester fabrics, and relates to the technical field of fabric finishing. The compound finishing agent is prepared from the following raw materials in parts by weight: 15 to 25 parts of cactus, 1 to 5 parts of polyaspartic acid/ glucosamine, 1 to 5 parts of hydroxypropyl methyl cellulose, 0.5 to 1 part of cationic polyacrylamide, 0.5 to 1 part of rice bran wax, 0.05 to 0.5 part of polydimethyl diallyl ammonium chloride, and 0.05 to 0.5 part of sodium gluconate. The compound finishing agent is rich in natural components, and after polyester fabrics are processed by the finishing agent, the polyester fabrics have an excellent and stable hydrophilic property, good antistatic performance, and good durability.

The invention discloses a healthy and environment-friendly coating for indoor walls. The proportioning ratio of each raw material component of the coating is: nano-titanium dioxide, 3-12 parts, vinyl acetate emulsion, 15-25 parts, acrylic emulsion, 10-20 parts Bamboo fiber powder, 8-15 parts, shell powder, 8-15 parts, zinc oxide, 3-10 parts, carboxymethyl cellulose, 0.1-0.9 parts, chitin, 2-10 parts, sodium carboxylate, 0.1-0.8 parts, polydimethylsiloxane, 0.3-1.0 parts of water, the ratio of the water to the total amount of the base material is 1:1.2-1:1.5. The photolysis of nano-titanium dioxide can completely decompose harmful organic substances such as indoor formaldehyde and toluene, pollutants, bacteria and other harmful organic substances, and the obtained environmentally friendly coating has good moisture absorption, breathability, anti-mildew and antibacterial effects.

The invention discloses a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber membrane. The preparation method specifically comprises the following steps: S1, preparing a PTFE/SiO2 composite hollow fiber membrane; S2, performing hydrophilic modification on the PTFE/SiO2 composite hollow fiber membrane; and S3, performing a hydrophily attenuation test on modified membrane yarns. The invention belongs to the technical field of water treatment of PTFE hollow fiber membrane. The invention discloses a preparation method of the hydrophilic polytetrafluoroethylene hollow fiber membrane. According to the preparation method, physicochemical cross-linking method is adopted; under the action of a coupling agent and a cross-linking agent, hydroxyl (-OH) is introduced onto the surface of the membrane to prepare the PTFE microporous membrane with stable hydrophilic performance; the hydrophilic performance of the composite microporous membrane is obviously improved; the stabilityof the hydrophilic performance of the PTFE hollow fiber membrane is ensured; the pure water flux of the modified membrane filaments can reach 3500L/m<2>*h, the water contact angle is 60 degrees, theadvantages of the PTFE hollow fiber membrane products are improved, the surface of the PTFE hollow fiber membrane has stable hydrophilic performance, and the application range of the PTFE hollow fibermembrane in the fields of membrane separation and water treatment is expanded.

The invention discloses a method capable of enhancing hydrophilic performance of cotton fibers. The method comprises the following steps of activating the cotton fibers to obtain pre-treated cotton fibers; swelling the pre-treated cotton fibers fully in a sodium hydroxide solution, successively adding epichlorohydrin and a phase change catalyst to react for 10-20 hours at 70-80 DEG C, filtering, washing and drying the solution, adding isopropanol into the solution, adjusting the pH value of a system with alkali liquor to 9.2-9.8, adding 2-6 parts of 0.6-0.8% HBP-NH2 solution under nitrogen protection to react for 2-4 hours at 50-60 DEG C, and washing and drying the solution to obtain amino cotton fibers; dissolving chitosan in an acetic acid solution, adding soyabean proteins, stirring thesolution for 20-40 min at 70-80 DEG C, cooling the solution to 40-46 DEG C, adjusting the system to be neutral, carrying out enzymolysis and enzyme deactivation, adding the amino cotton fibers, stirring the solution for 20-40 min at 75-85 DEG C, and filtering and washing the solution and vacuum drying the solution to obtain the hydrophilic cotton fibers.