37results about How to "Destroy crystal structure" patented technology

The invention relates to a starch and polylactic acid composite material and a preparation method thereof. The composite material comprises, by weight, 20 to 75 parts of modified starch, 10 to 65 parts of polylactic resins, 2 to 10 parts of hydroxy-terminated lactic acid oligomer with molecular weight of 800 to 2000, 1 to 10 parts of plasticizers, 0.1 to 1.0 part of aliphatic chain extenders, 0.5 to 2 parts of talcum powders and 0.1 to 3 parts of auxiliaries. The preparation method includes that firstly the modified starch, the polylactic acids, the hydroxy-terminated lactic acid oligomer, the plasticizers, the talcum powders, lubricating agents and coupling agents are blended together in a homogenizer to obtain a blend, and then a mixed material of the blend and the chain extenders is added in a twin-screw extruder to be subjected to melt extrusion, cooling and granulation to obtain the starch and polylactic acid composite material. The starch and polylactic acid composite material has the advantages that the compatibility, toughness and heat resistance are good, the cost is low, the biodegradation can be completely achieved, the preparation technique process is simple, the 'three wastes' emission is absent, and the mass production can be achieved.

A hollow golf club head has a head body having a face aperture part and a face member held to the face aperture part by welding, the face member formed by forging a rolled material of a titanium alloy having an α phase, and the face member comprising a thick-material part positioned in the center of the face member, an outer peripheral part positioned at the periphery of the thick-material part, and a thin-material part partially positioned between the thick-material part and the outer peripheral part. The thick-material part is formed in an area having a shape obtained by depressing a substantially elliptical or substantially circular shape in a substantially arcuate shape toward the center of the ellipse at two opposite sides thereof. The thick-material part, the thin-material part, and the peripheral part are formed by the forging so as to destroy an orientation of the α-phase.

The invention relates to a preparation method of a hydrogel matrix, especially a preparation method of an alginic acid hydrogel matrix for UV 3D printing, and belongs to the technical field of biological material preparation. According to the preparation method, alkenyl groups are grafted on the molecular chains of sodium alginate prepared by a freeze-dry method, and after dissolving and mixing, the alginic acid hydrogel matrix for UV 3D printing is obtained. The preparation method adopts a freeze-drying technology under mixed solvent environment, the grafting rate of sodium alginate is largely improved, and the problem that the UV curing speed is slow due to low grafting rate is completely solved. The prepared alginic acid hydrogel matrix can rapidly solidify under the irradiation of UV light, the solid state can be maintained, moreover, in the presence of low concentration metal halides, the system can be further solidified, the hydrogel strength is improved, and the problems of conventional 3D printing hydrogel such as difficult moulding, collapse, and the like are overcome. The preparation method is simple, the cost is low, and the preparation method can be applied to industry easily.

The invention relates to a preparation method of a biological adhesive, in particular to a preparation method of a hyaluronic acid biological adhesive, and belongs to the technical field of preparation of a biological material. The preparation method comprises the following steps: grafting an alkenyl group on an amorphous hyaluronic acid molecular chain according to a freeze-drying method, and performing dissolving and mixing so as to obtain the biological adhesive. According to the preparation method disclosed by the invention, a freeze-drying technology is adopted under mixed solvent environment, so that the crystal system structure of hyaluronic acid is greatly destroyed, hyaluronic acid molecules adopting an amorphous structure are formed, the grafting rate of the hyaluronic acid is greatly increased, and the problems that due to a low grafting rate, the ultra-violet curing speed is low and the formed gel is poor in intensity are completely solved. The biological adhesive prepared by the method disclosed by the invention can rapidly form gel under the irradiation of ultraviolet rays, and the gel is safe and good in biocompatibility, and can be completely degraded and absorbed. The preparation method disclosed by the invention is simple, the cost is low, and industrialized production is easy to realize.

The invention relates to the field of modification of biodegradable polymer materials, and in particularly relates to a method for thermal plasticizing modification of cassava dregs through mechanical activation and enhancement. The method comprises the following steps: weighing reactants including cassava dregs, a plasticizer and an auxiliary agent in a ratio of 100g:(10-25g):(5-15g), mixing the reactants at a high speed, then putting all the reactants into a ball mill, controlling the ratio of the reactants to pellets (stack volume) at 100g:(300-600ml), controlling the temperature of a circulating water bath at 50-90 DEG C, stirring at a low speed to perform a mechanical activation solid-phase reaction for 40-80 minutes, and separating the reactants and the pellets to obtain a modified cassava dreg thermoplastic material. The modification method disclosed by the invention is easy in operation, high in efficiency and low in cost; for a composite material obtained by performing conventional hot press molding on the modified cassava dreg thermoplastic material, the tensile strength and the bending strength reach 15.33MPa and 28.76MPa respectively, the Young modulus reaches 82.4Mpa, and the extension percentage is 6.6%.

Combined with the current situations of serious contamination of soil PCBs and a huge quantity of waste biomass in China, the invention discloses a novel technology suitable for preparing an environmental-friendly in-situ remediation agent for PCBs contaminated soil with the waste biomass serving as raw materials. The novel technology comprises the following steps that (1) the biomass, water and ferric salts are mixed and subjected to hydrothermal coprocessing to prepare iron-loaded hydrothermal carbon; and (2) the iron-loaded hydrothermal carbon is obtained after high temperature heat treatment. The in-situ remediation agent for the PCBs contaminated soil is prepared with the waste biomass serving as a carbon source, the preparation process is simple, rapid and efficient dechlorination degradation of PCBs in the soil can be realized, and the remediation agent has the characteristics of environmental protection, low price and the like.

The invention discloses a water body remediation wood fiber raw material pretreatment method sequentially comprising the following steps: (1) coarsely grinding, that is, coarsely grinding a water body remediation wood fiber raw material after air drying; (2) carrying out steam explosion, that is, carrying out steam explosion pretreatment on obtained sieving powder; (3) dissolving with an ionic liquid and regenerating a material, that is, adding the ionic liquid to a steam explosion material for dissolution treatment, and separating out solid from the steam explosion material after dissolution treatment by using water as an antisolvent; and (4) carrying out enzymatic saccharification, that is, carrying out enzymolysis by using the steam explosion material obtained from the step (2) or regeneration material obtained from the step (3) as a substrate to obtain an enzymatic saccharification liquid. The invention also provides a method for carrying out fermentation hydrogen production by utilizing the enzymatic saccharification liquid obtained from the method, that is, applying the enzymatic saccharification liquid to biological hydrogen production.

The invention discloses a method for producing high-viscosity and high-degree-of-substitution carboxymethyl cassava starch by utilizing an ultrahigh-pressure blasting technique. The method comprises the steps such as alkaline treatment, etherification reaction and purification. The method is carried out by primarily achieving the purpose of destroying a crystallization region of cassava starch particles by utilizing sodium hydroxide, sufficiently swelling and alkalifying starch molecules and loosening starch particles under the ultrahigh pressure of a high-pressure homogenizer, so that the hydroxyl of the starch becomes negative oxygen ions and the nucleophilic ability is strengthened, and simultaneously generating an St-O-Na<+> active center, then, preparing the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch through the bimolecular nucleophilic substitution between sodium carboxymethyl starch obtained by alkalifying the starch and chloroacetic acid under the alkaline condition of sodium hydroxide. By utilizing the high-degree destructive effect of the ultrahigh-pressure blasting technique on a crystallization structure of the cassava starch, the technical problems such as degradation of the starch particles in a production process of the high-viscosity and high-degree-of-substitution carboxymethyl cassava starch are solved.

The invention discloses a carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, a preparation method of the material, a lithium ion battery negative electrode plate and a lithium ion battery. A halogenated choline type low eutectic solvent is uniformly mixed according to a ratio to obtain a low eutectic solvent, and then the low eutectic solvent is mixed with lignocellulose; pretreatment is carried out firstly and then high-temperature carbonization is carried out to obtain a carbon material doped with nitrogen and lithium; and the carbon material can be applied to the lithium ion battery negative electrode material. A precursor adopted in the preparation method is obtained by uniformly mixing halogenated lithium with halogenated choline and derivativesthereof; the precursor is environment-friendly, wide in source and low in cost, and can be obtained on a large scale from the industry; a preparation process adopted by the method is concise, high inyield and high in purity; and a reaction system involved in the method disclosed by the invention is simple in component, convenient to configure, simple to operate, low in equipment requirement andfree of regional limitation, and is suitable for large-scale industrial production.

The invention discloses a high-nickel positive electrode material, a nickel-cobalt precursor material, a preparation method of the high-nickel positive electrode material, a preparation method of thenickel-cobalt precursor material and a lithium ion battery. The high-nickel positive electrode material is of a core-shell structure, the core is formed by aggregating primary particles with gradientdoped M element, and M comprises Al and/or Mn. The solid spheres and hollow spheres are contained in the primary particles, the sphere centers of the solid spheres or the hollow spheres are the spherecenters of the primary particles, and the radius of the solid sphere is 0-1/5 but not 0 of the radius of the primary particle. The outer spherical surface of the hollow sphere is the spherical surface of the primary particle, and the thickness of the spherical shell of the hollow sphere is 0-1/6 but not 0 of the radius of the primary particle. In the primary particles, the content of M is sequentially reduced from outside to inside, the molar ratio of the M element in the solid sphere to all elements in the high-nickel positive electrode material is 0.075%-0.75%, and the molar ratio of the Melement in the solid sphere to the M element in the hollow sphere is 1/3-1/2. The high-nickel positive electrode material disclosed by the invention is higher in specific capacity, good in cycling stability and better in rate capability.

The invention relates to a method for modifying nonthermoplastic cellulose derivative material, including the main content that 40 wt-80wt percent of matrices of nonthermoplastic cellulose derivative material, 1wt-50wt percent of a reaction monomer and 10 wt-59 wt percent of a plasticizer are evenly mixed and then arranged into a processing and mixing device. The mixing reaction is carried out for 1 minute to 20 minutes at 60 DEG C to 140 DEG C on the condition of the operation of the mixing device. The substance discharged is the nonthermoplastic cellulose derivative material with the modified performance. The method for modifying the nonthermoplastic cellulose derivative material, provided in the invention, does not require completing in a solvent with the addition of an initiating agent, thereby fully avoiding side reactions caused by the initiating agent remaining in the material when the modifying method of the prior art is adopted, such as degradation, oxidation, etc., as well as the environmental pollution caused by the use of the solvent. The method of the invention has simple realization technology and high reaction efficiency, and can obviously improve the heat resistance and processing performance of the nonthermoplastic cellulose derivative material.

The invention discloses a preparation method of a nylon foamed sole, which comprises the following steps: cross-linking a cross-linking agent and nylon to obtain pre-crosslinked nylon resin with a melt index of 1.5-4g/10min, the cross-linking agent being an isobutylene maleic anhydride polymer and/or a styrene maleic anhydride polymer, and the number of functional groups of the cross-linking agent being greater than 30; the pre-crosslinked nylon resin and a nucleating agent are mixed to obtain a modified nylon material, the weight percentage of the pre-crosslinked nylon resin is 96-99%, and the weight percentage of the nucleating agent is 1-4%; performing injection molding on the modified nylon material to obtain a plate; the board is placed in a nitrogen supercritical fluid to be subjected to pressure maintaining for 3-8 h, pressure relief is conducted at the speed of 10-15 MPa/min, and a foamed board is obtained; and carrying out mold hot pressing on the foamed sheet to obtain the nylon foamed sole. The preparation method disclosed by the invention is simple in production process and high in foaming efficiency, and the prepared nylon foamed sole is low in density, good in rebound resilience and high in tearing strength.

The invention provides a waste circuit board smelting soot reinforced alkaline leaching debromination recovery method, belongs to the field of bromine-containing smelting sootwhole-wet efficient and green bromide removal and particularly relates to a method for converting, debrominating and separating cuprous bromide in smelting soot in a waste circuit board melting tank through reinforced alkaline leaching. The method comprises the main following steps of reinforced alkaline leaching, neutralization and impurity removal, concentration-freezing crystallization and desulfuration, cold water washing and evaporative crystallization. Compared with the traditional alkaline leaching technology, the recovery method has the advantages that through the electric field/ultrasonic/microwave and otherreinforcement means, the crystalline structure of CuBr is further destroyed, fracture of a chemical bond is accelerated, the mass transfer effect is improved, the reaction activation energy is reduced, the reaction time is shortened, energy consumption is reduced, and the debromination rate is increased. The recovery method has the characteristics of being simple in process, easy to implement, green and free of pollution in the recovery process, efficient, energy-saving, free of tail gas and tail liquid emissions and the like.

The invention provides a method for pretreating a wood fiber raw material by adopting a molten salt hydrate system. The method comprises the following steps of crushing the wood fiber raw material toa proper particle size, and adding the crushed wood fiber raw material into the molten salt hydrate system; stirring and reacting at the temperature of 20-100 DEG C for 0.1-72 hours, and then adding aproper amount of water to terminate the reaction; and after the reaction is finished, performing solid-liquid separation, and cleaning and desalting the separated wood fiber solid with water to obtain the wood fiber solid capable of being used for enzyme hydrolysis saccharification treatment. The method disclosed by the invention is low in cost, simple to operate and high in matching property with a saccharification stage, the molten salt can be recycled, and the whole process is green and sustainable, so that the method has important significance for application of the wood fiber raw materials. Besides, efficient pretreatment of the wood fiber raw material is achieved under the condition that cellulose does not dissolve, operation convenience is provided for subsequent solid-liquid separation, the method has very important significance in practical application, and the complexity and the operation cost of separation operation are greatly reduced.