17results about How to "Improve wet strength" patented technology

The invention provides secondary modified silica sol and a preparation method and application thereof.The secondary modified silica sol is prepared from silica sol, a primary modified component, a secondary modified component and water, the primary modified component comprises mPEG5K-silane and poloxamer 188, and the secondary modified component comprises waterborne acrylic emulsion and span 80; the specific raw materials are adopted to carry out secondary modification on the silica sol, so that the obtained secondary modified silica sol is large in viscosity and high in adhesion, the casting back layer slurry containing the secondary modified silica sol is high in wet strength, the collapsibility of an investment casting back layer is improved, the residual strength of a shell is reduced, the quick-drying effect is strong, and the service life of the casting back layer slurry is prolonged. And in the subsequent sand cleaning process, the shell can be vibrated quickly, the residual sand powder is extremely little, the quality and performance of the material are effectively kept, the surface quality of the casting is good, the production efficiency is greatly improved, and the manufacturing cost is saved.

A preparation method of the high-efficiency chlorine-free wet strength agent comprises the following steps: mixing adipic acid and tetraethylenepentamine, and reacting at 155-175 DEG C for 6-8 hours to obtain prepolymer polyamide polyamine; diluting the prepolymer, adding ethylene glycol diglycidyl ether, heating to 30-45 DEG C, and preserving heat; adding epichlorohydrin to continue the heat preservation reaction, and adding acid to adjust the pH value of the system to 2-4 when the viscosity of the system is increased to 30-100 mPa.s; raising the temperature to 45-55 DEG C, adding a dechlorinating agent, and keeping the temperature; the high-efficiency chlorine-free wet strength agent for papermaking is prepared from adipic acid, tetraethylenepentamine, ethylene glycol diglycidyl ether and epichlorohydrin in a molar ratio of (0.5-1.2): (1-1.5): (0.2-1.0): (0.1-0.8) by adding deionized water to adjust the solid content, and the high-efficiency chlorine-free wet strength agent for papermaking is obtained. The prepared wet strength agent is chlorine-free and environment-friendly, can be used for food contact paper, is remarkably improved in retention and drainage aiding performance, shortens the curing time, and can greatly improve the wet strength, water resistance and folding strength of the paper.

The invention relates to the technical field of turbine blade manufacturing, and particularly discloses turbine blade surface layer slurry with low natural vibration frequency dispersity and a production process, the geometrical shape and size of a turbine blade are determined through a modeling technology so as to reduce the natural vibration frequency dispersity, single-factor experiment and multi-factor experiment design are carried out on the surface layer slurry, and the surface layer slurry with the low natural vibration frequency dispersity is obtained. The optimal viscosity, silicon content, pH value and cobalt aluminate powder adding amount are determined, and the performance requirements of the shell, such as wet strength, dry strength and collapsibility, are ensured. In the alloy smelting process, by accurately controlling the power and time of induction heating, precise control over the alloy melt temperature is achieved, grains are refined, the performance consistency of turbine blades is improved, by comprehensively analyzing surface layer slurry parameters and power adjustment in alloy smelting, the performance of the turbine blades is evaluated, the low natural vibration frequency dispersity is ensured, and the performance consistency of the turbine blades is improved. And the overall performance and reliability of the turbine blade are improved.

A bentonite-containing foundry sand and a preparation method thereof, belonging to the technical field of metal casting. The bentonite-containing foundry sand is specifically composed of: 90-95wt% of old sand, 1-3wt% of raw sand, 0.8-1.7wt% of modified sodium-based bentonite, 0.3-0.8wt% of coal powder, 0.4-1wt% of modified graphite, 0.5-1wt% of alpha-starch, and the remaining less than 100wt% is water. The bentonite-containing foundry sand obtained by the invention has a compaction rate of 36-42%, an air permeability of 90-140, a wet compressive strength of 140-170kPa, a hot wet tensile strength of 35-39kPa, a smoke emission of 678-692mg per kilogram of sand in the whole process of pouring and cooling, and a casting roughness of 25.

This invention relates to a production process for bamboo-cotton blended fabric, belonging to the field of fiber weaving technology. The process includes the following steps: bamboo fiber yarn is treated with cellulase and then impregnated in a carboxylated chitosan solution. After stirring, the yarn is removed, and excess solution is removed to obtain modified bamboo fiber yarn. Cotton fiber yarn is reinforced with a cotton fiber reinforcing agent to obtain modified cotton fiber yarn. The modified bamboo fiber yarn and cotton fiber yarn are spun together to prepare a base fabric. The base fabric is then treated with a processing solution to obtain a bamboo-cotton blended fabric. This invention provides an improved process for preparing bamboo-cotton blended fabric, which can improve the fabric's wash fastness, comprehensively enhance its antibacterial effect, and improve its mechanical properties, thereby meeting the market demand for high-quality textiles.

The present application relates to a kind of biodegradable dark color mulch and its preparation method, and dark color mulch is made of cellulose, hemicellulose and degradable coating.The manufacturing method includes the preparation of dark color mulch substrate, coating layer coating.It specifically includes slurry compounding, beating, additive addition, is formed by papermaking, dehydration, pre-drying, coating, sizing, drying, calendering, product after drying.The local film has good wet strength, light resistance, weather resistance, heat preservation and entropy increasing effect.The results of farmland degradation experiment show that the mulch can be biodegraded after 50~60 days, and the biodegradation rate is more than 90%.

The invention relates to the technical field of regenerated cellulose fibers, in particular to a preparation method of mulberry bark regenerated cellulose fibers, the fineness of the mulberry bark regenerated cellulose fibers is 1.11 dtex-2. 22 dtex, the length is 32-51 mm, and the diameter of the mulberry bark regenerated cellulose fibers is 10-20 micrometers. S1.1, weighing the following raw materials in parts by weight: 1-5 parts of a composite modifier, 45-55 parts of mulberry bark, 12-22 parts of sodium hydroxide, 0.4-0.6 part of sodium hypochlorite, 5-7 parts of carbon disulfide and 200-220 parts of coagulating bath; the coagulating bath consists of sulfuric acid, sodium sulfate and zinc sulfate; s1.1, preparing pulp from mulberry bark; s1.2, mulberry bark regenerated cellulose fibers are prepared from pulp, a composite modifier is adopted, and the wet strength, the size stability and the shrinkage rate performance of the regenerated cellulose fibers are improved through the synergistic effect of the mulberry bark regenerated cellulose fibers, the pulp and the composite modifier.

The invention provides a preparation method of high wet strength and high water absorbency wet curtain paper. The wet papermaking process is adopted to uniformly disperse mixed fibers such as plant fibers, water-soluble synthetic PVA bonding fibers and two-component composite fibers in an oil-water medium, and the mixed fibers are piled into a fiber web in a certain proportion. Then, a thermal bonding process is combined to make the wet curtain paper have higher dry and wet strength and wet stiffness performance, and the wet curtain paper does not deform when immersed in water and has a long service life. A suitable antibacterial and mildew-proof agent is appropriately added to the fiber web to make the wet curtain paper have excellent antibacterial and mildew-proof functions.

The invention discloses a manufacturing process for restoring paper characteristics of Chengnen scroll paper. The manufacturing process comprises the following steps of (1) material selection, (2) drying in the shade, (3) soaking, (4) pressure application, (5) cooking, (6) bleaching, (7) beating, (8) pulping, (9) desanding, (10) pulp preparation, (11) paper fishing, (12) squeezing, (13) paper drying, (14) processing and (15) physicochemical index detection. The prepared paper integrates the advantages of the steps of material selection, beating, desanding, paper fishing and the like, so that the prepared paper is fine and smooth in fiber and good in integrity, and relatively high wet strength and relatively low anti-aging whiteness of the paper are ensured. According to the finally prepared finished product paper, the paper characteristics of the Chenxi scroll paper are greatly restored, the wet strength and the anti-aging whiteness are highly restored, the requirements of the Song dynasty calligraphy and painting paper on the uncooked and matured properties and the ink absorption property are met in the external performance, and the characteristics that the skin is like an egg membrane and the hardness is like jade are recarved.

The invention provides modified silica sol as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing silica sol with aluminum-based metal salt to obtain a mixed solution; and (2) mixing the mixed solution obtained in the step (1) with an alkyl coupling agent to obtain the modified silica sol. The modified silica sol provided by the invention can improve the stability of the casting back layer slurry, a shell prepared from the casting back layer slurry containing the modified silica sol is high in wet strength, low in residual strength and short in quick drying time, the production efficiency is improved, and the cost is saved.

The invention relates to the technical field of carbon dioxide electrochemical conversion, in particular to a solid rust remover composition, a preparation method, a protection method and application. According to the solid rust remover composition provided by the invention, the tapioca flour, the alginate, the acid-soluble chitosan, the wheat protein and the phosphoric acid are subjected to chemical reaction crosslinking to finally form the solid rust remover. The solid rust remover disclosed by the invention is more convenient and simpler to apply, and can directly adsorb and remove metal rust in a solution. The preparation method of the solid rust remover composition provided by the invention is simple. According to the application of the solid rust remover composition in protection of the carbon dioxide electrochemical conversion catalyst and the protection method provided by the invention, the solid rust remover provided by the invention can prevent rust from poisoning the catalyst only by putting the solid rust remover into a position before the catalyst enters an electrolyte pipeline, and the solid rust remover composition is simple to apply and good in effect.

The invention discloses kitchen paper with high wet strength and high water absorption performance and a preparation method thereof.The knurling surface layer is provided with a first knurling unit and a second knurling unit, and the first knurling unit comprises a plurality of first protruding parts vertically and upwards arranged towards the upper surface of the knurling surface layer; the second embossing unit comprises a plurality of second protruding parts which face the embossing bottom layer and are arranged downwards. The knurling bottom layer is provided with a third knurling unit and a fourth knurling unit, the third knurling unit comprises a plurality of third protruding parts upwards arranged towards the knurling surface layer, and the fourth knurling unit comprises a plurality of fourth protruding parts vertically downwards arranged towards the lower surface of the knurling bottom layer; the first protruding part and the third protruding part form a first water storage unit, and the second protruding part and the fourth protruding part form a second water storage unit. According to the kitchen paper, the wet strength can be greatly improved, the aesthetic feeling can be improved, and the water absorption capacity is improved.

The invention relates to the technical field of papermaking, and particularly discloses a paper pulp papermaking reinforcing agent and a preparation method thereof.The paper pulp papermaking reinforcing agent is prepared from, by weight, 10-20 parts of polyamide epichlorohydrin resin, 1-2 parts of silicon dioxide, 1-5 parts of polyvinyl alcohol, 0.1-1 part of cross-linking agent, 120-150 parts of deionized water and 0.5-2 parts of modifier; the molecular structure of the modifier contains a fluorine element, a silicon element and an organic amine group, the dry tensile property, the wet tensile property, the folding resistance, the flame retardant property and the wet / dry tensile index ratio of the paper pulp reinforcing agent are jointly improved, and the prepared paper pulp papermaking reinforcing agent can be widely applied to paper reinforcing and has a wide application prospect.

The invention relates to a preparation method of a multi-system composite shell for an orientation and single crystal blade. The preparation method comprises the following steps: coating a surface layer with fused corundum powder or zircon powder, and coating a transition layer and a back layer with the composite matching of fused mullite powder, fused corundum powder, modified fused quartz powder and zircon powder materials. The modified fused quartz powder comprises 90%-95% of fused quartz powder, 3%-8% of graphite powder and 1%-3% of organic fibers. 5%-10% of a reinforcing agent needs to be added in the preparation of the zircon powder slurry. According to the method, the shell is prepared by compounding two or three refractory materials, and the characteristics of high strength, high thermal stability and easy collapsibility of corresponding materials are integrated. According to the method, the wet strength of the ceramic shell can be improved, the deformability of the shell is remarkably improved while the high-temperature strength is guaranteed, the defects of orientation, recrystallization, cracks and the like of single crystal blades caused by poor deformability of the shell can be avoided, and the qualified rate level is greatly improved.

This invention provides a biomass composite decorative paper reinforced with nanocellulose and its preparation method, belonging to the field of decorative paper technology. This application constructs a multifunctional synergistic biomass composite material through chemical modification and in-situ self-assembly strategies: negatively charged modified nanocellulose serves as the framework, and positively charged cationic chitosan acts as an electrostatic bridge, efficiently fixing optically functional carbon quantum dots and fillers, improving dispersibility and retention. The introduced tannic acid-zinc metal-organic network precursor is cross-linked and cured under hot pressing to form a chemical network, endowing the material with excellent wet strength and antibacterial properties. The system forms a physical and chemical interpenetrating network, achieving structural synergy. The functional components also protect and complement each other through UV shielding, synergistic antibacterial properties, and other means, jointly endowing the material with excellent and durable comprehensive performance.

This invention discloses a PHA water-based water-blocking coated pulp molded seedling pot containing inorganic fillers and blended polymers, and its preparation method, belonging to the technical fields of seedling containers, pulp molding, and water-based water-blocking coatings. This invention uses polyhydroxyalkanoates combined with sheet-like inorganic fillers to construct a dense water-based barrier layer and innovatively designs a sidewall drainage channel connecting to the bottom. Through a differentiated coating structure, this invention breaks the deadlock between moisture softening during the seedling stage and limited root penetration after transplanting, achieving a precise balance between excellent wet strength and free root growth. This solution eliminates fluorine-containing additives, ensuring the product's biodegradability throughout its entire life cycle.

The application discloses a peanut skin extract / chitosan blended solution with antibacterial function and high mechanical property and application in fibers and films, and belongs to the technical field of functional textile materials. The peanut skin extract is prepared by using a solvent extraction method, and then the amino groups on the chitosan and the phenolic hydroxyl groups on the peanut skin extract are combined together through ionic crosslinking, so as to prepare the peanut skin extract / chitosan blended solution. Finally, the peanut skin extract / chitosan blended solution is spun into fibers or cast into films, so as to improve the mechanical property, hydrophobic property, antibacterial property and the like of the fibers and the films.