12 results about "Calcium nitrite" patented technology

The invention discloses anti-corrosion marine concrete and a preparation method thereof, and relates to the technical field of marine concrete. Comprising the following raw materials in parts by weight: 270 to 290 parts of low-alkali ordinary Portland cement, 130 to 150 parts of slag powder, 110 to 130 parts of fly ash, 50 to 70 parts of high-density silica fume, 1100 to 1200 parts of aggregate, 110 to 125 parts of copper-plated microfilament steel fiber, 16 to 20 parts of ion shielding type silane grafted modified emulsion, 3 to 6 parts of melamine-formaldehyde resin coated calcium nitrite microcapsule, 0.05 to 0.1 part of modified cellulose ether and 6 to 8 parts of polycarboxylic acid high-performance water reducing agent. The water-binder ratio of the anticorrosive marine concrete is controlled to be 0.26-0.30. By constructing an organic and inorganic chemical bonding system and rheology regulation and control, uniform dispersion and stable film formation of the emulsion are realized, the interface bonding force is improved, the gradient vibration process is matched, the distribution of functional components is locked, layering and damage are avoided, and the concrete is endowed with excellent mechanical properties and self-repairing capability.

The invention discloses a wet-spraying protective coating for tunnels and underground engineering, a preparation method and a construction method. The coating is prepared from 40%-55% of ordinary Portland cement, 0.3%-2% of sulphoaluminate cement, 10%-15% of silica fume (SiO is larger than or equal to 92%), 12%-16% of acrylic latex powder, 2%-5% of hydrophobic modified nano-silica, 12%-20% of graded quartz sand, 0.1%-0.5% of antistatic fiber, 1%-2.5% of polycarboxylate superplasticizer, 0.8%-1.5% of calcium nitrite, 0.2%-0.5% of HPMC and 0.05%-0.3% of bentonite. The total percentage of the components is 100%. The preparation method comprises the steps of raw material pretreatment, staged mixing and vacuum packaging, and a three-stage mixing process is adopted to ensure uniform dispersion of fibers. During construction, water is added for stirring on site, and the material has high toughness, excellent impermeability and good bonding strength and is an environment-friendly system; the method is suitable for durability protection of concrete structures such as tunnels and underground engineering.

This invention belongs to the field of concrete technology, specifically disclosing an anti-corrosion coating material for concrete pipelines. It is made from the following raw materials in weight percentages: water 22.5%~23.0%, calcium nitrite 0.5%~1.5%, and silicate cement 75.0%~77.5%. This invention also discloses a method for preparing the anti-corrosion coating material for concrete pipelines, including the following steps: (1) weighing each raw material according to the weight ratio; (2) mixing the dry calcium nitrite and silicate cement evenly; (3) slowly pouring in the aqueous solution and stirring slowly, then stirring rapidly for 1 minute after even mixing to obtain the pipeline anti-corrosion coating material. This invention has economic and environmental advantages, and the coating also possesses outstanding anti-corrosion performance, solving the problem of concrete durability degradation caused by internal chemical corrosion and microbial corrosion in municipal sewage pipelines, and effectively extending the service life of pipelines.

The invention discloses an anti-freezing and anti-salt-corrosion protective coating material for a prefabricated part in a high-cold and high-salt environment and a preparation method thereof. Comprising the following raw materials in parts by weight: 50-100 parts of epoxy resin, 15-30 parts of a curing agent, 3-5 parts of a silane coupling agent, 3-8 parts of an anti-freezing agent, 3-8 parts of an anticorrosive agent, 1-3 parts of a dispersing agent and 1-3 parts of a toughening agent. The protective coating material prepared by the invention is suitable for prefabricated parts in high-cold and high-salt environments, and has high mechanical properties and anti-freezing and anti-salt corrosion properties. The combined use of ES216 epoxy resin and bisphenol A epoxy resin improves the mechanical properties of the material, the combined use of calcium magnesium acetate and dicyclohexylcarbodiimide improves the freezing resistance of the material, and the combined use of zinc dihydrogen phosphate and calcium nitrite improves the corrosion resistance of the material.

This invention discloses a low-heat disturbance grout suitable for construction in frozen soil and its preparation method. By weight, the raw materials include: 20-30 parts sulfoaluminate cement, 35-40 parts granulated blast furnace slag powder, 20-22.5 parts metakaolin, 15-17.5 parts alkali activator with slow-release effect, 290-310 parts fine aggregate, 30-35 parts water, 3-4 parts calcium nitrite, 0.4-0.6 parts water-reducing agent, and 0.02-0.04 parts triethanolamine. This invention significantly reduces the heat release during hydration while ensuring strength development, solving the problem of rapid, large, and concentrated heat release during cement hydration in frozen soil environments, which causes thermal disturbance to the frozen soil.

The utility model relates to a kind of outdoor anti-corrosion anti-freezing anti-solar manure anaerobic fermentation red mud film methane tank, including pool wall body, the pool wall body is embedded in stratum, the pool wall body is formed by concrete adding silicon powder and calcium nitrite mixed solidification, epoxy resin coating is fixedly arranged in the lower end of the pool wall body inside, the epoxy resin coating is arranged in the pool wall body inside arc, drainage hole is set in the both sides of the pool wall body and is close to its lower end, the both sides of the pool wall body and located corresponding drainage hole place are fixedly set with through pipe, support is fixedly arranged in the pool wall body inside.The utility model in the present application, the methane tank is arranged in arc epoxy resin coating, drainage hole and support can make rainwater to be discharged smoothly, protect red mud fermentation bag from soaking in accumulated water in use process, and can be reserved expansion joint for red mud fermentation bag, adapt to expansion and shrinkage of temperature change and prevent accumulation of snow.

The invention relates to positive electrode slurry, a preparation method, a positive electrode plate and a battery. The positive electrode slurry comprises an active substance, a conductive agent, a metal compound additive and a binder, and the metal compound additive comprises bismuth hydroxide and calcium nitrite. According to the positive electrode slurry, the performance of the zinc-nickel battery is remarkably optimized through the synergistic effect of bismuth hydroxide and calcium nitrite. Gas produced in the battery is greatly reduced, the problems of gas expansion and liquid spraying of the battery are solved, the conductivity is obviously improved, the anode current is uniformly distributed, active substances are efficiently utilized, and the cycle stability is improved.

The application relates to the technical field of concrete preparation, in particular to an anti-freezing steel pipe concrete and a preparation method thereof, which comprises the following components in parts by weight: cement 650-670 parts, machine-made sand 540-560 parts, air-quenched aggregate 540-560 parts, high water absorption resin 3.8-4.12 parts, water reducing agent 3.0-3.2 parts, composite anti-freezing agent 10-15 parts, air entraining agent 1-2 parts and water 290-304 parts; the composite anti-freezing agent is composed of fumed silica, modified silica ash and calcium nitrite. Through the synergistic cooperation of the composite anti-freezing agent, the high water absorption resin, the air entraining agent, the water reducing agent and the air-quenched aggregate, a multi-scale and multi-mechanism anti-freezing protection system is constructed, and the freeze-thaw damage problem of the steel pipe concrete when applied in cold regions is effectively solved.

The application discloses a salt additive melt blending pretreatment method of PET products. After the PET products are crushed, the salt additive is mixed, melt blending is carried out at 268-275 DEG C for 4-5 minutes, direct cooling is carried out without quenching, crushing and 80 mesh screening are carried out, and a pretreatment product is obtained. The salt additive is selected from one or more of sodium nitrate, sodium nitrite, potassium nitrate, potassium nitrite, calcium nitrate, calcium nitrite, sodium bisulfate, potassium bisulfate, sodium phosphate and potassium phosphate, and the addition amount is 0.5%-1.0% of the mass of the crushed PET material. The method can control the crystallinity increase, improve the powder yield, and the obtained product can be used for subsequent enzymolysis.

The invention relates to the technical field of concrete mineral admixtures, and particularly discloses a method for inhibiting delayed coagulation of granulated electric furnace phosphorus slag powder and improving activity, which comprises the step of using a modifier in the preparation process of modified phosphorus slag powder, the modifier comprises a modifier A and a modifier B; the modifier A comprises the following effective components in parts by mass: 28 parts of calcium nitrite, 5-15 parts of an improved chelating agent and 0.08-0.30 part of calcium hydroxide; the improved chelating agent comprises diethanolisopropanolamine; the modifier B comprises industrial sodium silicate powder. The method has the advantages that 1) the activity index of the cement-based material doped with the granulated electric furnace phosphorus slag can be obviously improved, and the setting time of the cement-based material can be effectively shortened; and 2) in the phosphorus slag powder production process stage, precise regulation and control are implemented in the phosphorus slag particle grinding process, so that delayed coagulation inhibition and activity improvement are realized, field admixture adjustment in the concrete preparation stage is not needed, and the application problem of the granulated electric furnace phosphorus slag in a cement-based material is solved from the source.

The invention relates to the technical field of building materials, in particular to a high-performance anti-freezing grouting material and a using method thereof.The high-performance anti-freezing grouting material is prepared from, by weight, 30-45 parts of cement, 5-10 parts of silica fume, 4-8 parts of microbeads, 40-60 parts of sand, 0.2-1 part of a water reducing agent, 0.5-2 parts of a composite anti-freezing agent and 0.1-0.6 part of polymer rubber powder; the sum of the parts by weight of the components is 100 parts. Wherein the composite antifreeze agent comprises an air entraining agent, calcium nitrite and sodium sulfate. The concrete has the advantages of good mechanical properties and fluidity, no shrinkage and excellent frost resistance, and can be applied to high-latitude and high-altitude severe cold areas.

The present application relates to the technical field of concrete mineral admixtures, and particularly discloses a method for inhibiting the setting of granulated electric furnace phosphorus slag powder and improving the activity, which comprises the step of using a modifier in the preparation of modified phosphorus slag powder; the modifier comprises modifier A and modifier B; the modifier A comprises the following mass fraction ratios of effective components: 28 parts of calcium nitrite, 5-15 parts of a modified chelating agent, and 0.08-0.30 parts of calcium hydroxide; the modified chelating agent comprises diethanol monoisopropanolamine; and the modifier B comprises industrial sodium silicate powder. The method has the following advantages: 1) the activity index of cement-based materials mixed with granulated electric furnace phosphorus slag can be significantly improved, and the setting time can be effectively shortened; and 2) the setting inhibition and activity improvement can be achieved by precisely controlling the phosphorus slag particle grinding process in the phosphorus slag powder production process, and the application problem of granulated electric furnace phosphorus slag in cement-based materials can be solved from the source without relying on the adjustment of the admixture in the concrete preparation stage.