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

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 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.

The invention discloses a method for producing fuel ethanol by fermenting wine lees. The method disclosed by the invention can be used for voluntarily preparing a complex enzyme system, namely high temperature-resistant alpha-amylase, saccharifying enzyme, cellulase and acid protease, can be used for greatly enhancing the effect of decomposing and cutting capacity and effectively decomposing cellulose, xylogen, crude starch, crude protein and pectin in the wine lees, and can be used for solving the problem of pollution of solid wastes on the environment and increasing the demand of energy fuel of a company by producing fuel ethanol by using the wine lees and well solving the problem of organic combination of the cellulose, acid hydrolysis and enzyme hydrolysis and transforming the biological substances into ethanol again by continuously carrying out non-isothermal simultaneous liquefaction, saccharification and fermentation in a same container. According to the method, residues generated in a production process can be taken as feeds for developing the animal husbandry, and microbes are fermented to produce biogas, organic fertilizers and planting edible fungi for developing the planting industry.

The invention discloses a method for synthesizing sodium type zeolite from fly ash and active carbon. The method comprises the following steps: 1, crushing: carrying out ball milling on the fly ash, and sieving the ball-milled fly ash for later use; 2, calcining: calcining the fly ash in a muffle furnace, taking out the calcined fly ash, and cooling the fly ash; 3, removing iron: mixing the fly ash with a hydrochloric acid solution, heating and stirring the obtained mixture, filtering the heated and stirred mixture, washing the filtered mixture with water until neutrality, and drying the washed mixture for later use; 4, ageing: uniformly mixing the fly ash with sodium carbonate, calcining the obtained mixture in the muffle furnace, taking out the calcined mixture, cooling the mixture, and carrying out fine grinding on the cooled mixture; 5, adding active carbon: adding the active carbon to the fly ash, and mixing to obtain a mixture for later use; 6, crystallizing: mixing the mixture obtained in step 5 with a sodium hydroxide solution, and stirring and ageing the obtained mixture at room temperature; and 7, washing and drying: placing the mixture obtained in step 6 in a reaction kettle, heating and crystallizing the mixture, washing the crystallized mixture with water, and drying the washed mixture to prepare the sodium type zeolite. The sodium type zeolite synthesized in the invention has the advantages of large surface area, strong adsorption ability, increased pore volume and large cation exchange amount.

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 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 relates to a method for modifying nonthermoplastic cellulose derivative material, including the main content that 40wt to 80wt percent of matrices of nonthermoplastic cellulose derivative material, 1wt to 50wt percent of a reaction monomer and 10wt to 59wt percent of a plasticizer are evenly mixed and then placed 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 by 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 and 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 relates to a preparation method of xylo-oligosaccharides, the main innovations of which are the pretreatment of lignin fiber materials with an alkali-ethanol solution, and the extraction of xylans with a subcritical water extraction method. The pretreatment method of the present invention can remove a large amount of lignin, reduce the bondage of lignin to carbohydrates, destroy the internal compact structure that hinders the enzymatic hydrolysis and saccharification of endoxylanase; it can also destroy the crystal structure of carbohydrates, and make biomass The contact between the raw material and the biocatalyst is more sufficient, and the enzymatic hydrolysis efficiency of the endoxylanase is improved. The xylan prepared by the method of the present invention has high purity and high yield, and the amount of endoxylanase used in the preparation of xylo-oligosaccharides in the subsequent process is small; and the cellulose content of the residue after subcritical water extraction of xylan is high , is a high-quality raw material for the preparation of fiber materials.

The invention belongs to the technical field of food processing, and specifically discloses a brewing method of Sanhua wine. The brewing method of Sanhua wine of the present invention comprises the following steps: (1) selecting rice; (2) washing rice; (3) pretreatment: adopting ultrasonic auxiliary treatment; (4) soaking rice; (6) Spreading to dry; (7) Mixing koji: evenly mixing in medicinal koji powder; (8) Saccharification in the lower vat; (9) Fermentation; (10) Distilling; (11) Aging blending. The Sanhua liquor brewed by the brewing method of the present invention has a high rate of superior grade and high quality of the Sanhua liquor, can effectively meet people's requirements for liquor quality, and has high production efficiency.

Combining the serious soil PCBs pollution and the huge amount of waste biomass in my country, the present invention establishes a new process suitable for preparing an environmentally friendly PCBs-contaminated soil in-situ remediation agent using waste biomass as a raw material, including the following steps: 1) The hydrothermal co-processing of biomass, water and iron salt is carried out to prepare iron-loaded hydrothermal charcoal; 2) the iron-loaded hydrothermal charcoal is obtained after high-temperature heat treatment. The invention uses waste biomass as a carbon source to prepare a PCBs-contaminated soil in-situ remediation agent. The preparation process is simple, and not only can realize the rapid and efficient dechlorination and degradation of PCBs in soil, but also the remediation agent has the characteristics of greenness, environmental protection, and low price.