32results about How to "Extended hydration time" patented technology

The invention discloses an anti-drought plant cultivation method, relates to the technical field of plant cultivating and planting, and particularly belongs to an anti-drought conservation and cultivation method capable of improving plant survival rates in soil-barren and drought regions. The anti-drought plant cultivation method is characterized by comprising the following steps: materials are prepared; a water storing and slowly releasing devices are designed; the water storing and slowly releasing devices are manufactured; contents are filled; water storing and slowly releasing devices are selected and used; and planting is conducted. The anti-drought plant cultivation method has the advantages of improving plant survival rates, saving water resources and improving wood yields and wood quality.

The invention discloses a method for improving the quality of a capsanthin product, comprising the following steps of: selecting capsanthin resin as an initial raw material; feeding the capsanthin resin in a mixer; adding water in the mixer, wherein the weight ratio of the capsanthin resin to water is 1: (0.05-0.2); stirring and mixing at a temperature of 40-50DEG C and at a rotating speed of 100-250rpm to obtain a mixed solution; cooling the mixed solution to be 30-40DEG C; centrifugally separating by using a centrifugal machine and collecting a clarified solution; and finally, carrying out gingerol and residue removal on the clarified solution to obtain a capsanthin finished product. The capsanthin finished product prepared by the method has favorable flowability; the phenomenon that precipitation demixing after the capsanthin product is placed for a long time is avoided; the content of a centrifugal precipitation is controlled within 2 percent; and the content of acetone insoluble substance of phospholipids is reduced below 1 percent.

The invention discloses a preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum. The preparation method is characterized by comprising the steps of feeding 60 to 70 mass parts of polyolefine derivative, 5 to 15 mass parts of maleic anhydride, 10 to 20 mass parts of methylacrylic acid and 2 to 10 mass parts of radical initiator into a reaction kettle, adding 140 to 220 mass parts of water into the reaction kettle, stirring, raising the temperature to 60 to 90 DEG C, reacting for 3-6h at 60 to 90 DEG C, reducing the temperature to room temperature after the reaction, then adjusting the pH value of reacted material to 6 to 8 with alkaline pH regulator, and then obtaining yellowish retarding and efficient water reducing agent products, wherein the mass percent of solids in the products is 30-50%. The preparation method has the advantages that the production process and equipment are simple, mass industrial production is easy to realize, the retarding effect on silicate cement and calcined gypsum material is obvious, and the water-reducing rate is high.

Provided modified aluminate cement is prepared from the following raw materials: aluminate cement, titanium-silicon micro-nano capsules, magnesium oxide, a phosphate, fly ash, modified acrylic emulsion and an activating agent, wherein the titanium-silicon micro-nano capsule is prepared from orthosilicate and titanate under the conditions of a surfactant and alkalinity. The aluminate cement prepared by the invention is wide in raw material source and simple in preparation method, has good high-temperature resistance, wear resistance, sulfate corrosion resistance, adhesion, crack resistance, freezing resistance, seepage resistance, corrosion resistance and aging resistance, also has good effects of adsorbing and degrading formaldehyde and organic pollutants due to the TiO2 structure, plays agood role in environmental protection, ensures the safety as a structural part, and has a wide application prospect.

The invention discloses a breeding method of selenium-rich crabs. Focusing on different growth periods of crabs, different artificial feeds are provided to feed the crabs, selenium-rich breeding is carried out in the aspects of the living environment and feeding of the crabs, the water quality is kept safe and free of pollution, the disease incidence is reduced, selenium-rich environment is created, and selenium-rich feed is provided, so that the selenium-rich crabs are produced. The artificial feeds are prepared from basic feed, microbial preparation, nano-selenium, minerals and vitamins.

The invention discloses a cement accelerator and belongs to the field of buildings. According to the cement accelerator disclosed by the invention, a substance with a cement accelerating effect is prepared by taking aluminum sulfate octadecahydrate and calcium oxide as raw materials and carrying out high-speed shearing; lithium slag is used as a raw material, is subjected to microwave treatment and is enabled to have more free lithium salts and the like, so that condensation of cement concrete can be promoted and the initial set time is shortened; in addition, alumina and calcium sulfate in the lithium slag also react to generate calcium sulphoaluminate hydrate, so that early strength can be improved; bamboo fibers are added for compounding and raw bamboo fibers are doped, so that the volume shrinkage stress is digested, and further cracks are reduced; the breaking strength of cement-based mortar is improved along with the increase of the doping amount of the raw bamboo fibers; the anti-cracking and compressive strength of the cement slurry at later stage is improved, and further the quality of cement is improved.

The invention discloses a peat soil solidifying agent based on a replacement function and a use method of the peat soil solidifying agent, and belongs to the technical field of soil solidifying. The solidifying agent is prepared from raw materials: machine-made sand with a replacement rate being 40%-60% calculated according to the mass percentage of the water-free soil particles in natural peat soil, 15%-45% of cement calculated according to the mass of the peat soil after the replacement, 10% of phosphogypsum, 3% of sodium sulfate, 1.5% of sodium chloride and 100% of water which are calculated according to the mass of cement. The use method of the solidifying agent includes the steps that after the peat soil is replaced with the machine-made sand, the peat soil is solidified by adding other materials. According to the peat soil solidifying agent based on the replacement function and the use method of the peat soil solidifying agent, the mechanical properties of the peat soil can be significantly improved; the amount of cement required for solidifying the peat soil is reduced, a new way for the solidification of the peat soil with sand with environment-friendly benefits is createdthrough the utilization of the machine-made sand, and the environmental pollution caused by stacking of the peat soil is reduced due to the utilization of phosphogypsum; and the solidifying agent rawmaterials are easy to obtain, the use method is simple, the cost is low and certain environment-friendly and economic benefits are achieved.

The invention relates to a wet-mixed mortar additive and a preparation method thereof. The wet-mixed mortar additive is prepared from the following raw materials in percentage by weight: 0.5-1.5% of sodium alpha-olefin sulfonate, 2-5% of dodecyl sulfuric acid, 3-8% of a polycarboxylate superplasticizer, 10-15% of sodium gluconate, 1-3% of diethanol amine, 2-5% of sodium sulfate, 2-5% of 4-methyl-2-pentenoic acid, 5-10% of modified nano silicon dioxide and the balance of water. The wet-mixed mortar additive prepared by the invention has good water retention capacity, can effectively prolong thehydration time of mortar, and improves the operability of cement mortar.

The invention discloses a construction method of a modular fabricated steel structure house. The construction method specifically comprises the following steps including (1) house modular design; (2)steel structure wall surface treatment; (3) foundation construction; (4) steel structure skeleton mounting; (5) structure modular construction; (6) structure module inside concrete pouring; (7) prefabricated exterior wall mounting; and (8) water, electricity and heating pipeline connection. According to the construction method provided by the invention, by spraying polymer mortar on steel structure walls and to-be-poured surfaces, the bonding force between a steel structure and concrete interfaces and the corrosion resistance of the steel structure are enhanced; foundation pouring concrete isprepared by adopting a strong retarding type polycarboxylic acid water reducer, and concrete internal stress cracking is reduced; and a foundation concrete vibrating bar is wrapped with a polytetrafluoroethylene coating, and the foundation concrete compactness, mechanical property and durability are improved.

The invention relates to the field of building materials, and particularly discloses saltpetering-resistant concrete with an automatic shrinkage compensation function. The saltpetering-resistant concrete with the automatic shrinkage compensation function is prepared from the following raw materials: cement, a filling material, an saltpetering-resistant agent, mineral powder, fine aggregate, coarseaggregate and water, wherein the saltpetering-resistant agent is prepared from carboxymethyl cellulose grafted polyethylene glycol monomethyl ether and salicylic acid; the preparation method comprises the steps of weighing and mixing. The concrete has the following effects that the shrinkage rate is remarkably reduced while the efflorescence resistance of the concrete is remarkably improved, andthe concrete has the advantage of automatic shrinkage compensation.

The invention discloses a biomedical alpha-Ca (HPO4) x (SO4)1-x*1/2H2O solid solution particle and a preparation method thereof. By means of a wet-chemical method and heat treatment, parts of SO4 <2-> in CaSO4 are promoted to be replaced by HPO4<2-> to obtain the alpha-Ca (HPO4) x (SO4)1-x*1/2H2O solid solution particle, and compositions and proportions of the alpha- Ca (HPO4) x (SO4)1-x*1/2H2O solid solution particle can be adjusted. The prepared alpha-Ca (HPO4) x (SO4)1-x*1/2H2O solid solution particle can be widely used in the filed of biomedical materials of bone filling materials, bone cement and the like.

The invention discloses an osmotic pump controlled release tablet with a milnacipran selected-time delayed controlled release function and a method for preparing the osmotic pump controlled release tablet. The osmotic pump controlled release tablet comprises a tablet core and a semi-permeable membrane with medicine release holes. The tablet core comprises a medicine containing layer and a propulsion layer, the medicine containing layer comprises hot-melt extrusion substances, the hot-melt extrusion substances are prepared from milnacipran and hot-melt excipients, the hot-melt excipients preferably are compositions of PVP (polyvinyl pyrrolidone) and PEG (polyethylene glycol), and a weight ratio of the PVP to the PEG is 4:1-10:1; the propulsion layer comprises polyoxyethylene, osmotic pressure active substances, povidone and the like; the medicine containing layer and the propulsion layer are compressed to obtain a double-layer tablet, then the semi-permeable membrane wraps the double-layer tablet, and the semi-permeable membrane is perforated. According to the technical scheme, the osmotic pump controlled release tablet and the method have the advantages that medicines can be effectively released in a controlled manner, medicine onset blanking periods can be shortened, the osmotic pump controlled release tablet which is prepared by the aid of hot-melt extrusion processes can becompletely released in an in-vitro manner and effectively conforms to zero-order release characteristics, and the bioavailability and the stability of the osmotic pump controlled release tablet whichis a product can be improved.

The invention relates to the technical field of building materials, in particular to a grouting material for reinforcing a medium-coarse sand layer and a preparation method thereof.The grouting material is prepared from 30-50 parts of superfine slag powder, 15-45 parts of water, 0.2-0.4 part of a water reducing agent and 1.7-4.5 parts of an alkaline exciting agent, and the alkaline exciting agent is a mixture of sodium hydroxide, sodium carbonate, calcium hydroxide and calcium formate. The superfine slag powder is adopted as a gelling component of the grouting material, the activity of the superfine slag powder is thoroughly excited through the alkaline exciting agent with specific composition, and the defect of the superfine slag powder is overcome by matching with the water reducing agent with specific dosage, so that the prepared grouting material is high in early strength, good in fluidity, appropriate in hardening time and suitable for construction characteristics of a medium-coarse sand layer reinforcing process; and preparation of the building material only by using the superfine slag powder becomes reality.