839results about How to "Prolong clotting time" patented technology

The invention discloses an oscillatory scanning laser beam-electric arc hybrid welding method and system. Laser beams and electric arc move together along an abutted seam in large range space, simultaneously the laser beams surround acting points of the electric arc to perform oscillatory scanning movement in a local small area, and an actual welding track is a curve formed by overlying two types of movements. As for an optimal range of laser beam oscillatory scanning displacement, the range in the direction of an X axis is minus 2mm to 3mm, the range in the direction of an Y axis is minus 5mm to 5mm, the range in the direction of a Z axis is minus 2mm to 2mm, and the oscillation frequency is in a range from 20Hz to 500Hz. According to the method and the system, an enhanced technical effect is achieved by the aid of interaction of a laser beam oscillatory scanning effect and a laser-electric arc synergistic effect, and the welding quality is improved. Compared with existing laser-electric arc hybrid welding and laser scanning welding methods and systems, the method and the system have the advantages that higher weld porosity inhibiting capability is achieved, and the weld strength is improved by 10% to 50%.

A gelatining material similar to cream for filling underground working surface is preapred from the Ca-contained non-crystal and microcrystal material, alkali and / or sulfur contained exciting material, active material, aggregate and regulator. A filling slurry is prepared from said gelatining material, filling aggregate, fine particles, regulator and water through heating to at least 18 deg.C and proportional mixing.

The invention discloses a chemical foamed concrete and a preparation method thereof. The concrete product is prepared by using a cementing material, a foaming agent, a compounded additive and water as raw materials through a chemical foaming principle, and the added compounded additive realizes stable foaming speed stability, uniform bubble diameter and controllability. The chemical foaming preparation method has the advantages of simplicity, low production investment cost, and convenient construction. The foamed concrete product prepared in the invention has the advantages of fireproof property, waterproof property, sound insulation, heat insulation, light weight, high compressive strength and environmental protection. The bulk density, the compressive strength and the heat conduction coefficient of the obtained product are less than 400kg / m<3>, more than 3.5MPa and less than or equal to 0.07W / (M.K) respectively. The above formula adopting alkaline ash comprising alkaline furnace ashes, alkaline slag, alkaline furnace slag and other wastes as raw materials realizes comprehensive utilization of resources, changes wastes into valuables, and accords with the demands of sustainable development of national circular economy.

The invention discloses a construction method of a large-volume concrete bearing platform with one-time pouring in winter, comprising the following steps of: step 1, binding steel reinforcement cages; step 2, laying cooling water pipelines and temperature measuring elements; step 3, constructing formed templates, wherein the construction process comprises delimiting template lines and constructing formed brick dies; step 4, pouring concrete; and step 5, conserving and finishing surface: finishing surface in time when completing the pouring of the concrete, carrying out the surface finishing twice, carrying out the first surface finishing when pouring the concrete to the top, carrying out the second surface finishing when the concrete is initially congealed, and adopting a mode that external stores water for conserving when the concrete is initially congealed. The invention has the advantages of reasonable design, simple construction method step, convenient operation, short construction period, one-time pouring molding and strong maneuverability, the large-volume concrete bearing platform constructed for molding in winter has good quality, the poured concrete is not frozen, and the surface of the bearing platform can not have temperature cracks.

The invention belongs to the technical field of architectural materials, specifically relating to a retarded polycarboxylic acids series water reducing agent. The compounded components are polycarboxylic acids series water reducing agent employing allyl group polyethylene glycol as raw material, sodium lignosulphonate, gluconic acid sodium salt, sodium citrate, sodium pyrophosphate, sucrose and water which are added to a mixing machine under normal temperature. After full agitation and dissolution, then the invention is prepared. The raw materials of the invention are low in price, the performance of the products is stable, and the invention has good market prospect.

The invention discloses a phosphogypsum based plastering gypsum, and relates to a plastering material for a building wall. The phosphogypsum based plastering gypsum mainly comprises 75 to 95 percent of phosphogypsum based building gypsum, 1 to 3 percent of sierozem powder, 0.1 to 0.5 percent of retarder, 1.1 to 5.5 percent of composite water retention agent, 0.3 to 1 percent of ethylene-vinyl acetate copolymerized latex powder, and 0 to 20 percent of stuffing. The phosphogypsum based plastering gypsum effectively improves water retention property and lowers cost by adopting the combination of cellulose ether water retention agent and bentonite, effectively adjusts settling time and prolongs operable time by adopting the retarder, improves construction property, cohesive property and cracking resistance by doping the stuffing and the latex powder, and reduces adverse effects of impurities on the strength of plastering gypsum by adding the sierozem powder. The phosphogypsum based plastering gypsum has the advantages of good workability and construction property, long operable time, high breaking resistance, compression resistance and adhesion strength, good volume stability, good cracking resistance and lower cost, and can be used for a plastering layer of the building wall.

Acid concentrates, and dialysate compositions prepared therefrom, contain citric acid and an effective amount of a buffering agent selected from acetate and / or lactate. The buffering agent allows a physiologically acceptable amount of citrate to maintain the desired pH of the dialysate.

The invention relates to a retarding superplasticizer composition for roller compacted concrete, which is prepared from 40-80 percent of barium-containing naphthalene based superplasticizer, 10-30 percent of modified lignosulfonate, 3-7 percent of plastic retaining agent, 5-15 percent of composite retarder, 1-7 percent of layer silicate mineral material, 0.1-0.5 percent of polysiloxane and 0.1-0.2 percent of air entraining agent. The retarding superplasticizer composition does not contain alkali harmful to alkali-aggregate reaction, has a better inhibition effect to the alkali-aggregate reaction, and has the advantages of high water reducing rate, strong VC value retaining capacity, good water retaining property, small bleeding rate, remarkable retarding effect and the like, so that the prepared roller compacted concrete mixture has the characteristics of good workability, small VC value loss, small bleeding rate, long setting time, greatly reduced early hydration heat and delayed occurrence time of a hydration heat peak, so as to have better construction property, mechanical property and durability.

The present invention discloses a kind of polyimide fiber and its preparation process. The preparation process includes the following steps: 1. reacting 4, 4í»-diamino diphenyl ether and pyromellitic dianhydride in the weight ratio of 1 to 1.02 with N, N-dimethyl acetylamide solution of 15-20 % concentration at 0-5 deg.c to obtain polyamic acid solution; 2. wet spinning the polyamic acid solution and imidation reaction of the polyamic acid fiber to obtain polyimide fiber through dewatering and cyclization; and 3. mixing the polyimide fiber with acetic anhydride and triethylamide, flushing with acetone, soaking and drying to obtain the polyimide fiber. The present invention has positive effects of optimized synthesis condition of spinning solution, prolonged solidification period of initially formed fiber in the solidification bath, and fiber with ideal mechanical performance.

The invention relates to a self-solidification biological active material of hemigydrate calcium sulfate base, relative production and application. Wherein, the invention is characterized in that: said material is paste formed by harmony liquid, hemigydrate calcium sulfate / tricalcium silicate composite powder, while their mass ratio is 0.8-1.2:1; said harmony liquid is one of deionized water, analogue humor, inorganic salt solution or inorganic solution; the content of tricalcium silicate in the hemigydrate calcium sulfate / tricalcium silicate composite is 1-50%. The invention can be shaped freely, without cell toxicity, while it can be degraded stepped with adjustable speed, and it can induce the generation of skeleton agustite, with higher activity then calcium sulfate material.

The invention discloses shield synchronous grouting slurry prepared from shield waste slurry and a construction method thereof, each cubic meter of the shield synchronous grouting slurry comprises the following components: 100-200kg of cement or 40-100kg of lime, 300-450kg of fly ash, 200-750kg of the waste slurry, 600-1300kg of sand, 0-450kg of water and 0-12kg of a water reducer. The waste slurry pollution problems can be alleviated, the amount of raw materials of mortar can be reduced, the shield waste slurry is mainly used in backwall grouting material for replacement of bentonite and arts of water in backwall grouting mortar, and the environmental pollution problems caused by the waste slurry can be reduced.

The invention provides a preparation method of a slushing agent for concrete. The preparation method comprises the following steps in sequence: implementing the first reaction between maleic anhydride and hydroxypropyl methyl cellulose in glacial acetic acid under the catalysis of acetate, so as to obtain the hydroxypropyl methyl cellulose monomaleate; and carrying out free radical polymerization between methyl allyl polyoxyethylene ether, acrylic acid solution and hydroxypropyl methyl cellulose monomaleate under an oxidentive-reductive initiation system, so as to obtain the slushing agent for concrete. According to the slushing agent for concrete, prepared by the preparation method provided by the invention, the molecular structure contains the hydroxypropyl methyl cellulose molecular structure unit, so that the macromolecules of the slushing agent can be entangled with each other to form a net-shaped structure to wrap cement and water for effectively preventing the moisture in the mortar from evaporating, and as a result, the slump keeping property is good. The invention also provides the slushing agent for concrete, and the slushing agent for concrete has the structure as shown in formula (1).

The invention discloses a Chinese medicinal composition for treating hyperlipidemia, which relates to a Chinese medicinal composition. The Chinese medicinal composition solves the common problems of more ingredients and unreliable quality caused by complicated manufacturing process in the conventional traditional Chinese medicine for reducing blood fat. The Chinese medicinal composition is prepared from tuber fleeceflower root, hawthorn, wild chrysanthemum, cassia seed, liquoric root, Chinese wolfberry, Chinese yam, oriental waterplantain rhizome, twotooth achyranthes root and red sage root. The Chinese medicinal composition for treating the hyperlipidemia is prepared by mixing traditional Chinese medicines based on traditional Chinese medicine theory; and compared with the conventional Chinese medicinal preparation for treating the hyperlipidemia, the Chinese medicinal composition has fewer traditional Chinese medicine ingredients, is scientific in mixing and prepared from widely available raw materials, does not contain excipients, is not complicatedly manufactured, can be directly taken when crushed and then prepared into capsules, is low in cost, reliable in quality and more suitable for promotion and use, and has no toxic or side effect.

The invention discloses a preparation method of a water retaining agent. The preparation method comprises the following steps: carrying out an aqueous phase radical polymerization reaction on unsaturated amide micro-monomers, unsaturated sulphonic acid micro-monomers and unsaturated polyether macromers or unsaturated ester macromonomers under the coaction of an oxidation-reduction system composed of an initiator and a reducing agent to obtain a copolymerization product, regulating the pH value to 6-7 after the reaction, and adding water to obtain the water retaining agent with mass concentration of 1-60%. The preparation method disclosed by the invention is used for adjusting the product properties by controlling the monomer proportion, the temperature and the dosage of the initiator and the reducing agent, the reaction speed is high, the efficiency is high, no organic solvent is used, no toxin or pollution is generated, and the operation is simple. The unsaturated macromonomers are introduced into the prepared concrete / mortar water retaining agent to ensure excellent water retaining property and obviously perfect such stirring states of the concrete / mortar as bleeding / separation and the like without generating such adverse effects as strength and the like, meanwhile, the water retaining agent can be compounded with a polycarboxylic acid water reducing agent at any proportion to ensure good intermiscibility. The product performance is stable.

The present invention relates to face-beautifying preparation with the functions of removing facial chloasma, whitening facial skin and removing facial wrinkles. Said face-beautifying preparation contains 6 ingredients of rose extract, Chinese angelica root extract, carthamus flower extract, grape seed extract, vitamin C and vitamin E. Besides, said invention also provides its preparation method.

The invention provides super retarding concrete which comprises the following components by weight percentage: 11-16 percent of cement, 2-4 percent mineral powder, 3-5 percent of coal ash, 23-30 percent of sand, 39-50 percent of crushed stone, 0.15-0.3 percent of retardant, 0.2-0.4 percent of additive and 7-12 percent of water, wherein the sum of the percentage contents of all components is 100 percent. The super retarding concrete greatly prolongs the setting time under condition of ensuring adequate long-term strength, has the advantages of good cohesiveness and water retention, and avoids segregation and bleeding phenomenon before or after being poured.

The invention provides a Chinese medicinal composition for treating cardiovascular and cerebrovascular diseases which comprises the following raw material herbs (by weight portions): astragalus root 480-660, radix salvia miltiorrhiza 60-160, red peony root 60-160, rhizome of Sichuan lovage 60-160, Chinese angelica root 60-160, safflower 60-160, leech 40-90, ground beetle 40-90, peach kernel 60-160, artificial ox gallstone 10-40, antelope's horn 10-40, buthus martensi kirsch 50-140, polygala root 60-160, acorus gramineus soland 60-160 and medicinal adjuvant. The invention also provides the method for preparation and use of the composition.

The invention discloses an alkali-efflorescence-free high-waterproofness dry-powder tile joint mixture which is prepared from the following raw materials in percentage by weight: 28-35% of ordinary silicate cement, 22-35% of coal ash, 22-32% of super fine activated admixture, 3-8% of needle-shaped wollastonite powder, 3-8% of coarse whiting powder, 0.5-2% of redispersible latex powder, 0.1-0.6% of a water repellent, 0.1-0.6% of cellulose ether, 0.1-0.6% of an alkali efflorescence inhibitor, 0.1-0.5% of wood fiber and 0.1-0.3% of a defoaming agent. Due to the adopted super fine activated admixture, the alkali efflorescence phenomenon of an ordinary cement base joint mixture is effectively inhibited, and the overall decoration effect of the tile joint mixture is greatly improved. The water repellent used in the joint mixture is redispersible water repellent powder which has good peaceability with water, so that the joint mixture has a very excellent overall water repellent effect in a hardened state and is especially applicable to relatively damp places such as bathrooms and swimming pools.

The invention discloses a green rapid-hardening early-strength magnesium phosphate-based healant and a preparation method thereof. The green rapid-hardening early-strength magnesium phosphate-based healant is composed of a material A and a material B; the material A is prepared via mixing of a phosphate, borax, a toughening ingredient, an accelerating component, a water retention ingredient, a water reducing ingredient, and a grinding aid dispersing agent; and the B material is prepared via mixing of magnesium oxide, flyash, silica fume, ground steel slag, chromium iron tailing slag powder, anhydrite, an expanding agent, and a grinding aid dispersing agent. According to the preparation method, industrial supplementary cementious materials (flyash, silica fume, and ground steel slag) are added into cement, so that cement fluidity and early strength are improved; industrial chromium iron tailing slag powder is added into the green rapid-hardening early-strength magnesium phosphate-based healant as a filling material, so that it is beneficial for cement hydration reaction, set cement compaction rate is increased, and at the same time heavy metal waste solidification is realized. The green rapid-hardening early-strength magnesium phosphate-based healant is capable of achieving balance between magnesium phosphate cement setting time and high early strength, and solving problems that shrinking percentage is large and bonding strength is low.

The invention relates to steel slag concrete comprising the following components: cement, water, barite sand, stones, sintered pellets, a naphthalene high-efficiency water reducing agent, an expanding agent, and fly ash. The steel slag concrete has the advantages that the steel slag concrete is prepared by mixing the cement, water, the barite sand, the stones, the sintered pellets, the naphthalene high-efficiency water reducing agent, the expanding agent and the fly ash; the sintered pellets and the barite sand enable the density of the concrete to be effectively improved; with the use of the barite sand, the sintered pellets can be prevented from sinking, the separation resistance of the concrete is improved, and the amount of the cement is reduced; the fly ash effectively reduces the hydration heat of the concrete; with adulteration of the naphthalene high-efficiency water reducing agent, the work degree of the concrete is improved, the setting time of the concrete is delayed, the construction difficulty is effectively reduced, and the construction period is greatly shortened; and with reasonable utilization of the industrial waste residue sintered pellets, the energy is effectively saved, the environment is effectively protected, and the production cost is reduced.

The invention provides a compound red sage root freeze dried powder injection containing salvianolic acid B and its preparing process, wherein the injection comprises root of red rooted saliva, notoginseng and borneol, and is prepared through extracting root of red rooted saliva and notoginseng to obtain red sage root extract, pseudo-ginseng extract, dissolving baras camphor with right amount of ethanol, coating with beta-cyclodextrin, charging injection for water into red sage root extract, notoginseng or red sage root and notoginseng extracts for dissolving, boiling, cooling down, filtering, mixing filtrate with baras camphor beta-CD inclusion solution, charging mannitol, adding right amount of water for injection, adjusting pH, and freeze-drying. In the obtained freeze dried injection, calculated by salvianolic acid B (C36H30O16), the content of red sage root 6.25-100.00mg / g freeze-dried powder solid.

The self-protecting welding wire with flux core for pipeline steel has welding wire comprising BaF2, SrF2 and / or CaF2 7-12 wt%, LiF 0.8-3.0 wt%, CaO 0.2-0.8 wt%, SiO2 0.1-0.4 wt%, Al 1.2-2.0 wt%, Mg 1.2-2.0 wt%, Mn 0.6-1.2 wt%, Ni 0.6-1.2 wt%, C 0.05- 0.10 wt%, Zr 0.05-0.3 wt%, B 0.002-0.012 wt%, and Fe for the rest; and flux core accounting for 18-25 wt%. It contains water in 0.010-0.120 wt%, and has reduced current fluctuation and raised welding performance.

The invention discloses a casting riser induction heating device. The casting riser induction heating device comprises a riser sleeve; an annular sleeve prepared of graphite, steel, or other conductive materials; an induction coil; a thermoelectric couple; water cooled cables; a temperature recorder; and an induction heating power supply cabinet. Compared with conventional insulated risers and exothermic risers, the casting riser induction heating device possesses following advantages: riser setting time prolonging effect is more excellent than that of the conventional insulated risers and exothermic risers; real-time control on the temperature of molten metal in risers can be realized; recycling of induction heating risers can be realized; production cost is reduced; no environmental pollution is caused in using process; and environmental requirements are satisfied preferably.

The invention discloses a retarder suitable for quick set and rapid hardening of a magnesium phosphate cement system and a method of application thereof, wherein the retarder is composed of one chlorine salt or more compound chlorine salts; and the retarder comprises four methods of applications; the first method is to prepare solution fresh; the second method is to prepare solution in advance; the third method is to stir modified magnesium phosphate cement fresh; and the fourth method is to pre-stir modified magnesium phosphate cement. The four methods of application are simple and quick in operation when being used for preparing a magnesium phosphate cement repair material; different retarders have different effects; and the status quo of long-term use of the solid retarder for the magnesium phosphate cement system is changed. The retarder provided by the invention is excellent in retarding effect; on the one hand, the retarder is capable of greatly prolonging the solidification time of the magnesium phosphate repair system at normal temperature and still has strong retarding effect in the high temperature environment; and on the other hand, the retarder is capable of ensuring the early strength of the magnesium phosphate cement sample and also improves the long-term strength thereof to a certain extent.

The invention belongs to the field of building materials and concretely relates to modified phosphogypsum and a preparation method thereof. The modified phosphogypsum is characterized by being formed by mixing, wetly grinding and then aging phosphogypsum, general-purpose silicate cement and water, wherein the accounted dry-basis mass percentages of the phosphogypsum and the general-purpose silicate cement are as follows: 95-99 percent of phosphogypsum and 1-5 percent of general-purpose silicate cement, and the sum of the accounted dry-basis mass percentages of the phosphogypsum and the general-purpose silicate cement is 100 percent; and the addition quantity of the water is 50-70 percent of the total mass of the phosphogypsum and the general-purpose silicate cement, and the addition quantity of the water includes the quantity of free water in the phosphogypsum. The method has the advantages of simple process, no need of high-temperature curing, less admixture dosage and low cost, and the coagulating time of phosphogypsum-based cement concrete can be shortened by the modified phosphogypsum which is prepared by the method.

The invention provides a polycarboxylate water reducer containing modified water-soluble acrylate and a preparation method thereof. The preparation method comprises the following steps: firstly, directly carrying out esterification reaction on polyhydroxy-alcohol carbohydrates and crylic acid so as to prepare modified water-soluble acrylate micromonomers; then putting polyether macromonomers into deionized water, and fully dissolving so as to prepare a reaction base solution; dissolving the acrylate micromonomers, crylic acid, an initiator vitamin C and a chain transfer agent mercaptoacetic acid into deionized water, so as to prepare drop concentrate; putting an initiator hydrogen peroxide into the reaction base solution, dropwise adding the drop concentrate into the reaction base solution at a constant speed, reacting while stirring, then regulating the pH value of the solution to be 7-8, so as to prepare the polycarboxylate water reducer. According to the preparation method, the regulating function of the polyhydroxy-alcohol carbohydrates is directly used in the water reducer, so that the property of the water reducer is optimized; the polycarboxylate water reducer prepared by the method has high water reducing rate, and the concrete is obviously improved in fluidity retainability and has less slump loss, so that the water reducer can meet higher construction requirements.

The invention relates to a method for direct preparation of a cement retarder by using the industrial by-product, semi-hydrated phosphogypsum, which belongs to the technical field of cement additives. According to the invention, phosphogypsum is aged at first; when 40% to 80% of semi-hydrated gypsum in phosphogypsum is converted into dihydrate gypsum, phosphogypsum is broken, and an alkaline activating agent and water are added for mixing; granulation is carried out on an obtained mixture, and obtained granules are naturally maintained and dried in air so as to obtain the cement retarder; wherein, the weight percentage of phosphogypsum, the alkaline activating agent and water is as follows: phosphogypsum 80 to 90 parts, the alkaline activating agent 0.5 part to 4 parts, and water 10 to 20 parts. A semi-finished product produced in the process of granulation for the cement retarder provided in the invention coagulates and hardens in a short time; a finished product coming out from a granulator has a certain degree of hardness and has a compressive strength of between 3 to 5 MPa in 5 minutes; when the finished product freely falls from a testing platform of a height of 1 meter, breaking probability of the finished product is less than 10%; the finished product can be directly transported with a loader, thereby greatly saving a storage area for the finished product. Meanwhile, the method has the advantages of simple production process flow, economy and environmental protection.

The invention discloses a retarding self-closing polymer cement waterproof coating which comprises two components, namely powder material and liquid material, wherein the liquid material comprises a polymer emulsion, a wetting agent, a plasticizing agent, an organic silicon defoaming agent and water; the powder material comprises cement, quartz powder, a filler, an active compound and a retarding agent; and the weight ratio of the powder material to the liquid material is 1:1. According to the retarding self-closing polymer cement waterproof coating, after the two components are stirred and mixed, a highly dispersed retarding agent is contained, the retarding agent fast emulsifies moisture contained in a mixture to generate double electric layers, and the double electric layers can prolong the setting time of a coated film by reducing the interaction of the cement and the water, so that the construction safety is ensured; more unhydrated cement can be retained in the coated film because of the existence of the retarding agent, and more crystals can be generated to intensify self closure when the coated film cracks to cause water leakage; the self closure of the coated film is less than 6 hours; and the initial setting time of the coating is more than 50 minutes.

The present invention discloses phosphorous ground slag cement mortar, and comprises ordinary silicate cement, phosphorous ground slag, sand and water. On the one hand, the phosphorous ground slag used in the present invention is used as mixed material to substitute the cement in equal weight to be mixed into the pre-mixing commodity mortar, thus reducing the consumption volume of the cement; on the other hand, the retardation property of the phosphorous slag is used to obviously prolong the condensation time, thereby overcoming the weakness that the retardation agent must be added into the traditional pre-mixing commodity mortar, and can realize the effect similar to the adding of the retardation agent. Therefore, the present invention makes full use of the effect of the phosphorous to improve the workability of the mortar, thereby greatly reducing the production cost, and reducing the environmental pollution.