300 results about "Hydroxypropylmethyl cellulose" patented technology

The invention relates to the technical field of building materials, and provides washing gangue concrete with high slump loss resistance and a mixing process thereof. The high-slump-retaining washed gangue concrete is prepared from the following raw materials in parts by weight: 200 to 220 parts of cement, 140 to 150 parts of mineral powder, 60 to 65 parts of fly ash, 680 to 720 parts of machine-made sand, 950 to 970 parts of washed gangue, 150 to 160 parts of water, 16 to 17.5 parts of a water reducing agent, 0.15 to 0.3 part of a slump retaining agent and 4 to 4.3 parts of polyethylene glycol. The slump retaining agent is hydroxypropyl methyl cellulose ether; and the viscosity of the hydroxypropyl methyl cellulose ether is 100 thousand mPa.s to 300 thousand mPa.s. According to the technical scheme, the problems of poor slump retaining performance and low compressive strength of washed gangue concrete in the prior art are solved.

The invention relates to the field of building material construction, and discloses a construction method of foam lightweight concrete suitable for long-distance pipeline transportation, and the construction method comprises the following steps: selecting a high-pressure hose with the pipe diameter of DN 100mm-DN 150mm as a pumping pipeline; before the foam lightweight concrete is conveyed, a hydroxypropyl methyl cellulose aqueous solution with the mass concentration of 0.05%-0.15% is used for pre-wetting the pumping pipeline, and a lubricating layer is formed on the inner wall of the pumping pipeline; and the foam lightweight concrete is conveyed to a construction area through the pumping pipeline to be poured. According to the method, through construction process improvement (pipeline lubrication and buffer pouring), the foam light soil can be transported for a long distance (larger than or equal to 500 m).

The invention belongs to the technical field of gas analysis, and relates to a surface-enhanced Raman scattering flexible substrate material as well as a preparation method and application thereof. The surface-enhanced Raman scattering flexible substrate material comprises a three-dimensional network structure and silver nanoparticles, the three-dimensional network structure is composed of hydroxypropyl methyl cellulose nanofibers, the silver nanoparticles are wrapped in the hydroxypropyl methyl cellulose nanofibers, and the silver nanoparticles are of a polyhedral structure. The surface-enhanced Raman scattering flexible substrate material is used for detecting thiol compounds in a solution, and the detection limit can reach 10 <-19 > M level; after the surface of the silver nanoparticle is modified with the probe, the material can detect trace substances in exhaled air. In addition, after the material is stored for 6 months at room temperature, the SERS signal intensity attenuation is less than or equal to 4%, and the relative standard deviation detected by 20 random sites is only 4.04%.

Compositions in homogenised powder form consisting of hydroxypropyl methylcellulose particles, and at least one chemical signalling agent in particle form, and optionally a biologically active agent, wherein the homogenised powder comprises particles having a mean particle diameter of ≥20 μm to ≤500 μmm uses and kits therefor.

The invention belongs to the technical field of plant care essential oil extraction, and particularly relates to sanshool delayed care essential oil and a preparation method thereof. The invention discloses a sanshool-enriched lipid composition which is prepared from the following components in parts by weight: 0.05 to 0.1 part of sanshool-enriched fraction, 1 to 2 parts of solid lipid, 1 to 1.5 parts of liquid lipid, 1.5 to 2.5 parts of stable surfactant, 1 to 2 parts of cosurfactant, 3 to 5 parts of glycerol, 0.2 to 0.5 part of soothing anti-irritation component, 0.05 to 0.1 part of sodium hyaluronate, 0.1 to 0.3 part of hydroxypropyl methyl cellulose, 0.05 to 0.1 part of antioxidant and the balance of purified water. According to the invention, sanshool is used as a core functional factor, and through collaborative design of supercritical extraction, molecular distillation purification, NLC carrier encapsulation and a soothing film-forming system, contradictions of effectiveness, mildness and the like in an existing scheme are solved, and mild desensitization, stable controlled release, reduction of stimulation and migration risks and improvement of tolerance and action consistency are realized.

The invention belongs to the technical field of polymer compositions, and particularly relates to a high-weather-resistance artificial turf and a preparation method thereof. The high-weather-resistance artificial turf is prepared from the following components in parts by mass: 125 to 160 parts of matrix resin, 8 to 12 parts of coloring master batch, 6 to 8.5 parts of microcapsule compound, 5.8 to 10 parts of functional additive and 3 to 7 parts of lubricant, wherein the microcapsule is prepared by compounding a shell material obtained by reacting diisocyanate with polyamine and a core material which is a phase change material. The preparation method comprises the following steps: premixing matrix resin, coloring master batch, a microcapsule compound, a functional additive and a lubricant, and carrying out melt extrusion, wire drawing and shaping to obtain the artificial grass. And implanting the artificial grass into the base cloth, and carrying out gum coating, cutting and rolling to obtain the high-weather-resistance artificial turf. The microcapsules and the hydroxypropyl methyl cellulose are doped in the matrix resin, so that the artificial turf still has stable elasticity, strength and wear resistance in complex temperature and humidity environments.

The application relates to the technical field of cough-relieving medicines, and discloses a high-efficiency cough-relieving loquat particle composition which is composed of the following components in parts by weight: loquat leaf extract 30-40 parts; white front extract 10-15 parts; platycodon grandiflorum extract 6-10 parts; white mulberry bark extract 18-25 parts; stemona sessiliflora extract 7-10 parts; menthol 0.1-0.5 part; polyethylene glycol 2-5 parts; mannitol 8-12 parts; ethyl cellulose 3-6 parts; hydroxypropyl methyl cellulose 1-3 parts; phosphatidylcholine 1-3 parts; polysorbate 80 1-3 parts; cross-linked sodium carboxymethyl cellulose 4-6 parts; and sucrose 40-60 parts. The double dispersion system combining the immediate-release component and the sustained-release component is adopted, the solubility and the initial release speed of the traditional Chinese medicine extract are remarkably improved through the addition of polyethylene glycol and mannitol, and the technical effect that the drug effect appearing time is remarkably shortened is achieved. Compared with the technical scheme relying on only a single release mode in the prior art, the deficiency that the drug effect is slow and the symptoms of the patient cannot be timely relieved is solved.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

The application discloses a lithium-free high-heat-resistant ceramic mud and a preparation method thereof, and relates to the technical field of ceramic materials. In the preparation of the lithium-free high-heat-resistant ceramic mud, alumina is reacted with 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain pre-modified alumina; the pre-modified alumina is reacted with starch to obtain modified alumina; ethyl acetoacetate, isopropyl alcohol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide are mixed to form a spinning solution, the spinning solution is electrospun, and then immersed in yttrium oxide sol to obtain alumina-zirconia-yttria composite fibers; the modified alumina, talc, alumina-zirconia-yttria fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water are stirred and mixed, and vacuum pugging is carried out to obtain the lithium-free high-heat-resistant ceramic mud. The lithium-free high-heat-resistant ceramic mud prepared by the application has good thermal shock resistance and bending strength after sintering.

The invention relates to the technical field of wastewater treatment, and particularly discloses graded hydroxypropyl methyl cellulose production slurry wastewater treatment equipment which comprises a supporting frame, the top of the supporting frame is fixedly connected with a treatment box, the top of the treatment box is communicated with a feeding nozzle, the bottom of one side of the treatment box is communicated with a feeding port of a first electromagnetic valve, and the bottom of the other side of the treatment box is communicated with a second electromagnetic valve. A discharging port of the first electromagnetic valve communicates with a discharging pipe, filtering devices are fixedly connected to the two sides of the inner wall of the treatment box correspondingly, one side of the treatment box communicates with an inclined impurity discharging pipe, a fixing plate is fixedly connected to one side of the treatment box, and a mixing assembly is fixedly connected to the top of the fixing plate; one side of the mixing assembly is communicated with a feeding port of a conveying pump, the grading type hydroxypropyl methyl cellulose production slurry wastewater treatment equipment is provided with a filtering device, so that large-particle impurities do not need to be automatically cleaned and discharged manually, and the grading type hydroxypropyl methyl cellulose production slurry wastewater treatment equipment is provided with a flocculation stirring device, so that tiny impurities in wastewater can be effectively removed.

The invention discloses an ophthalmic preparation and application thereof. The ophthalmic preparation comprises a TNF alpha nano antibody, a protective agent, a thickening agent, a buffer solution and an optional surfactant, and pH lt is larger than or equal to 6.0 and smaller than or equal to 0; 7, 7; the protective agent is selected from at least one of trehalose, mannitol, arginine and glycine; the thickening agent is selected from any one of hydroxypropyl methyl cellulose, polyvinyl alcohol and sodium hyaluronate; the buffer solution is a phosphate buffer solution or a histidine buffer solution. The ophthalmic formulations are useful in the treatment of immune-mediated inflammatory ophthalmic diseases.

The invention discloses an anti-swelling cellulose-based supramolecular ion hydrogel sensing material as well as a preparation method and application thereof. The method comprises the following steps: esterifying hydroxypropyl methyl cellulose in ethyl acetate by using acryloyl chloride to obtain hydroxypropyl methyl cellulose acrylate; the preparation method comprises the following steps: dissolving 1-vinyl imidazole and 3-bromopropionic acid in N, N-dimethylformamide to prepare an imidazole ionic liquid; the preparation method comprises the following steps: dissolving hydroxypropyl methyl cellulose acrylate in deionized water, adding imidazole ionic liquid, acrylic acid, N, N-methylene bisacrylamide and ammonium persulfate, and reacting to obtain the anti-swelling cellulose-based supramolecular ionized water gel sensing material. The anti-swelling cellulose-based supramolecular ion hydrogel sensing material prepared by a free radical copolymerization strategy has the characteristics of good strength, flexibility, swelling resistance, freezing resistance, antibacterial property, biocompatibility, high conductivity, high sensitivity and strong environmental adaptability.

The present application relates to the technical field of binder, especially to a binder suitable for refractory material and its preparation process and application. The binder suitable for refractory material is prepared from the following raw materials in parts by weight: 30-40 parts of dispersible sulfonated starch ether, 20-30 parts of naphthalene sulfonate sodium formaldehyde condensate, 3-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of sodium bentonite, 3-5 parts of fumed silica and 1-3 parts of polyvinyl alcohol. The main raw material of the binder of the present application is also added with dispersible sulfonated starch ether prepared from the following raw materials and preparation process. When the dispersible sulfonated starch ether is used together with the above-mentioned raw materials, firstly, the strength of the refractory material product can be improved; secondly, when the binder is added to the refractory material for molding, the cracking of thick-gauge refractory material during drying or sintering can be avoided, and the refractory material product prepared has fewer cracks at the edges and corners.

The invention discloses a scheme design of a temperature and humidity dual-response eupatorium extract slow-release pillow filler, and belongs to the technical field of functional home textile materials. The problems that an existing eupatorium pillow is single in filler response, fast in effective component loss, poor in signal transmission and insufficient in comfort level are solved. According to the technical scheme, the preparation method comprises the following steps: preparing an eupatorium volatile oil-hydroxypropyl-beta-cyclodextrin inclusion compound (the inclusion rate is 88-92%), and loading the inclusion compound on gradient pore activated ceramic balls (the surface layer is 5-8 [mu] m, the transition layer is 8-10 [mu] m and the core layer is 15-20 [mu] m); coating a composite coating of a beewax-sunflower wax-coconut fat temperature-sensitive matrix (phase change is 32-33 DEG C) and hydroxypropyl methyl cellulose-sodium alginate humidity-sensitive gel (50%-70% RH expansion is 150%-200%); and a three-layer composite bag (3 mm silica gel salient points are arranged on the inner layer) is matched. The 24-hour release rate of the filler during double-signal triggering is 68-72%, the day time is less than or equal to 15%, the service life is 9 months, and the filler is mainly applied to sleep-aiding pillows to improve the sleep quality and comfort.

This invention belongs to the technical field of filtration aids for food-grade enzyme preparation production, specifically relating to a composite filter aid comprising food-grade diatomaceous earth, food-grade expanded perlite, microcrystalline cellulose, food-grade silica powder, food-grade calcium carbonate, food-grade magnesium carbonate, hydroxypropyl methylcellulose, a diatomaceous earth porous framework compound modified with a low-adsorption sodium alginate pectin silica hydration layer for glucose oxidase, a perlite microcrystalline cellulose chitosan tannic acid-bridged gradient pore modification compound, and food-grade silica. Its preparation includes preparation of a basic mixture, preparation of a composite mixture, drying and cooling, and sieving. This invention forms a loose and stable filter cake, reduces filtration resistance, and improves the filtration speed, filtrate clarity, and enzyme activity retention rate of the glucose oxidase production solution.

The present application relates to the field of new type cigarettes, and particularly discloses a method for reducing yellow spots of heated cigarette cut tobacco, characterized in that a film material is coated on the surface of the heated cigarette cut tobacco; the heated cigarette cut tobacco is cut tobacco with a smoke generating agent; and the film material comprises hydroxypropyl methyl cellulose. The present application can effectively solve the problem of yellow spots of cut tobacco based on the film material.

The invention discloses a forest fire prevention and extinguishment gel material and a preparation method thereof, and the forest fire prevention and extinguishment gel material comprises the following other raw materials in parts by mass: 3 parts of sodium silicate; 0.6 to 0.8 part by mass of hydroxypropyl methyl cellulose; 3-4 parts by mass of sodium bicarbonate and 1 part by mass of lauryl sodium sulfate; and 13-17 parts by volume of alkaline silica sol. The gel material provided by the invention has excellent water-retaining property, high viscosity, strong adhesive power, high foam stability and thermal stability. After combustion, a compact SiO2 carbon layer can be formed, and a lasting physical barrier is formed.

The application discloses a preparation method of a deodorant product, and comprises the following steps: step one, preparing a cross-linked hydroxypropyl methyl cellulose and chitosan water solution: hydroxypropyl methyl cellulose and chitosan are dispersed in water in a mass ratio of 1:1 to form a uniform and stable water dispersion a; peracetic acid and a copper ion catalyst are added to the water solution a, and the water solution a is heated and treated at 80-100 DEG C for 3-5 hours to obtain a water solution b; glucose is added to the water solution b to remove excess peracetic acid, and the water solution b is heated and treated for 1 hour again; and the cross-linked hydroxypropyl methyl cellulose and chitosan water solution is obtained after cooling; step two, preparing a stable hydrogen peroxide solution: urea is added to a hydrogen peroxide solution, and the solution is stirred at 40-50 DEG C for 1 hour; cyclodextrin is added to the above solution, and the solution is continuously stirred at 40-50 DEG C for 1 hour; and the stable hydrogen peroxide solution is obtained after cooling to room temperature; and step three, preparing the deodorant product: the cross-linked hydroxypropyl methyl cellulose and chitosan water solution obtained in step one and the stable hydrogen peroxide solution obtained in step two are mixed in a ratio of 1:5 to 1:1, and sodium chlorite is added, so that the deodorant product is obtained after stirring.

The invention discloses a cement stabilized macadam test piece and a preparation method thereof, and belongs to the technical field of traffic civil engineering. The test piece is prepared from the following components in parts by mass: 85 to 92 parts of graded aggregate, 6 to 12 parts of composite cementing material and 0.3 to 0.8 part of special admixture; the graded aggregate is of a skeleton-transition-filling three-stage structure, and the filling aggregate contains surface modified silicon carbide microbeads; and the special additive contains a slump-retaining polycarboxylic acid water reducing agent and a hydroxypropyl methyl cellulose-xanthan gum composite adhesive. The components of the test piece have a synergistic effect, and through multi-dimensional synergy of aggregate grading, modified filler and admixture regulation and control, the problems of large-particle-size broken stone sinking, uneven aggregate distribution and segregation, insufficient compactness and the like in the forming process of the cement stabilized broken stone test piece are effectively solved; the compactness, the mechanical strength and the durability of the cement stabilized macadam test piece containing the large-particle-size macadam are remarkably improved, and the composition materials of the cement stabilized macadam test piece can be used for base layer construction of high-grade highways and municipal main roads and meet the heavy-load traffic requirement.

The object of the present invention is to provide an alcohol composition that contains hydroxypropyl methylcellulose or methylcellulose in a manner that allows the thickening properties of hydroxypropyl methylcellulose or methylcellulose to be exerted, thereby not only having a viscosity that is easy to spread and does not drip easily, but also suppressing liquid dripping and / or improving transparency, and having a good spreadability. The above object is achieved by an alcohol composition comprising: 60 to 93 parts by mass of at least one alcohol selected from ethanol and isopropanol; 3.0 to 39.9 parts by mass of water; and 0.1 to 4 parts by mass of at least one water-soluble cellulose ether selected from hydroxypropyl methylcellulose and methylcellulose, wherein the loss tangent (tanδ) of the alcohol composition, measured at 20°C, a frequency of 1 Hz, and a deformation of 0.1%, is 0.10 to 1.00.

The invention relates to a low-carbon concrete preparation method based on low-temperature pyrolysis fly ash. The low-carbon concrete is prepared from the following raw materials in parts by weight: 250 to 270 parts of cement, 105 to 125 parts of modified fly ash, 550 to 570 parts of quartz sand, 130 to 150 parts of fly ash-based glass body, 1000 to 1200 parts of stone, 6 to 10 parts of functional additive, 10 to 20 parts of nano filler, 20 to 30 parts of composite expanding agent, 3 to 6 parts of retarder, 5 to 10 parts of hydroxypropyl methyl cellulose ether, 1 to 2 parts of polyoxyethylene polyoxypropylene ether and 170 to 200 parts of water. The prepared low-carbon concrete not only has excellent impermeability and corrosion resistance, but also has good mechanical properties and durability, the service life of the low-carbon concrete is effectively prolonged, meanwhile, carbon emission and energy consumption brought in the concrete preparation process are reduced, high-added-value resource utilization of solid waste is achieved, and the method is suitable for industrial production. And the circular economy concept is met.

The application relates to an anti-oxidation neodymium-iron-boron magnet and a preparation method thereof. The anti-oxidation neodymium-iron-boron magnet comprises a neodymium-iron-boron base body and a protective coating coated on the outer surface of the neodymium-iron-boron base body. The protective coating is made of a protective coating material, and the protective coating material comprises an A component and a B component. The A component comprises the following raw materials in parts by weight: bisphenol A type epoxy resin 80-90 parts, solvent 40-50 parts, organic silicon resin 10-15 parts, PVDF resin 6-9 parts, inorganic filler 11-15 parts, zinc powder 6-10 parts, zirconium isopropyl alcohol 5-10 parts, styrene-acrylonitrile-glycidyl methacrylate copolymer 4-7 parts, silane coupling agent 2-4 parts, graphene 7-11 parts, and hydroxypropyl methyl cellulose 2-4 parts. The B component comprises a curing agent. The protective coating is combined with the neodymium-iron-boron base body closely, which helps to improve the anti-oxidation and corrosion resistance of the neodymium-iron-boron magnet and prolong the service life of the neodymium-iron-boron magnet.

The invention relates to freshening and whitening toothpaste and a preparation method thereof. The freshening and whitening toothpaste comprises the following raw materials: hydrated silica, disodium dihydrogen pyrophosphate, a PVM / MA copolymer, color repair particles and an auxiliary agent, the color repair particles are prepared from mannitol, microcrystalline cellulose, CI 74160, cetyl alcohol, corn starch, ethyl cellulose and hydroxypropyl methyl cellulose. Through combination of triple whitening methods, tooth whitening is realized, a color locking film is formed on the surface of the whitened tooth, color spots and color spots are prevented, and the tooth yellowing risk is reduced. Experiments prove that the freshening and whitening toothpaste disclosed by the invention has an effect of freshening breath, the temperature of the inner wall of the oral cavity can be remarkably reduced by 4.5 DEG C by using the toothpaste, and the toothpaste has no irritation to the mucous membrane of the oral cavity and is high in safety.

The present application relates to a pharmaceutical composition of nizatidine and a preparation method and use thereof. The pharmaceutical composition comprises an active ingredient and a carrier material; wherein the active ingredient is nizatidine or a pharmaceutically acceptable salt thereof; the carrier material comprises a first carrier material and a second carrier material, the first carrier material is acrylic resin and its derivative, and the second carrier material is hydroxypropyl methyl cellulose and its derivative. The pharmaceutical composition has a low total impurity level and excellent physical and chemical stability.

The application discloses a drying method of hibiscus flowers. The method comprises the following steps: 1) enzyme inactivation and color protection: the hibiscus flowers are sequentially immersed in an acidic citric acid-vitamin C solution and a solution added with corn stem and leaf water extract, so as to efficiently inactivate oxidase and protect color; 2) composite film construction: a hibiscus leaf extract solution is used as a natural film-forming matrix, is compounded with hydroxypropyl methyl cellulose and the like to form a film-forming solution, the hibiscus flowers are immersed and coated, and a supercritical CO2 drying technology is used to form a uniform and porous protective film on the petal surface; and 3) hot air drying: two-stage gradient temperature and humidity control is adopted for final drying. The application can significantly inhibit enzyme browning and non-enzyme browning in the drying process, effectively reduce the loss of functional components such as anthocyanins and flavonoids, solve the problems of petal blackening, brittleness, fragility and the like caused by traditional drying, and the finished product is full in shape, bright in color, and green in the whole process.

The application relates to the field of road engineering materials, and particularly discloses a highway disease repairing material and a repairing method. The repairing material comprises the following raw materials: SBS modified asphalt, waste rubber powder, tackifier, composite fiber stabilizer, mineral filler and reinforcing filler. The tackifier is epoxy acrylate resin, the composite fiber stabilizer comprises hydroxypropyl methyl cellulose and modified microcrystalline cellulose / talc powder compound. The modified microcrystalline cellulose / talc powder compound is prepared by the following steps: talc powder is treated by gamma-methacryloxypropyl trimethoxysilane and 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt, then mixed with microcrystalline cellulose, and then reacted with terephthalic acid and glycine. The repairing method comprises the following steps: removing redundant fragments; smearing tack layer oil, then mixing and paving the repairing material in a pit; rolling and leveling the highway pavement. The application has the characteristics of prolonging the service life of the repaired pavement.

The invention discloses hydroxypropyl methyl cellulose drying equipment which comprises a processing cylinder, the processing cylinder is provided with a cylindrical structure and an annular positioning plate arranged on the outer side of the processing cylinder, the bottom of the annular positioning plate is fixedly connected with a supporting seat, the top of the processing cylinder is fixedly connected with a feeding frame, and the feeding frame is fixedly connected with a conveying belt. The bottom of the processing cylinder communicates with a discharging frame, a supporting rod is fixedly connected to the position, close to the top, of the inner side of the annular positioning plate, and an arc-shaped opening is formed in one side of the annular positioning plate. The scattering device is used for scattering the caked cellulose, and the scattering device is located in the processing cylinder; the invention discloses a drying device which is used for drying cellulose, and relates to the technical field of hydroxypropyl methyl cellulose processing. The hydroxypropyl methyl cellulose drying equipment can extrude and scatter caked cellulose in a treated spherical shell, and the situation that the cellulose is bonded into blocks during drying is avoided.

A pharmaceutical composition comprising: an active pharmaceutical ingredient (API); 1-45 wt% non-gelatin matrix former comprising hydroxypropyl methylcellulose (hypromellose, HPMC), methyl cellulose,

The invention discloses a high-toughness plastic for a medical needle tube and a preparation method of the high-toughness plastic, and belongs to the technical field of polymer composite materials. The product comprises the following components: polycaprolactone, maleic anhydride grafted polylactic acid, a chitosan modified hydroxypropyl methyl cellulose derived carbon dot bacteriostatic agent and the like. The preparation method comprises the steps of preparation of the carbon dot bacteriostatic agent, pretreatment of raw materials, preparation of the functionalized master batch, segmented temperature control twin-screw extrusion melt blending and the like. The composite carbon dot bacteriostatic agent is constructed by hydrothermal carbonization-two-step amidation grafting, and is matched with the functionalized master batch preparation and interface regulation and control technology, so that the problems that the bacteriostatic agent of the existing medical needle tube material is easy to migrate, poor in compatibility and insufficient in toughness are solved, the synergistic improvement of long-term bacteriostasis and high toughness is realized, the biocompatibility is guaranteed, and the medical needle tube material has a good application prospect. The device is suitable for intrusive medical instruments such as medical needle tubes.

The application discloses a kind of concrete for TBM lining in-situ 3D printing and preparation method thereof, belong to civil engineering materials field.It includes by weight parts: 6000 parts cementitious material, 5400-6600 parts quartz sand, 1290-1350 parts water, 0.6-0.9 parts hydroxypropyl methyl cellulose, 24-36 parts polycarboxylic acid water reducing agent, 6-9 parts calcium formate, 12-18 parts xanthan gum, 300-540 parts MgO expanding agent, 75-105 parts polyoxyalkyl alcohol shrinkage reducing agent, 40-80 parts steel fiber, 120-180 parts Fe3O4 nanoparticles.The cementitious material is mixed by Portland cement and sulphoaluminate cement, and the mass ratio is 1:(0.67-1.5).The concrete has low water-binder ratio, excellent extrudability, fast initial setting and high early strength, and can realize continuous, high-strength and integrated in-situ 3D printing construction of TBM tunnel lining.