127results about How to "Economical and environmentally friendly" patented technology

A flexible epoxy adhesive and application thereof are disclosed, wherein the flexible epoxy adhesive comprises a component A and a component B; the component A is composed of the following components according to part by weight: 100 parts by weight of epoxy resin, 30-50 parts by weight of polyurethane blocked by acrylate groups, 15-20 parts by weight of diluting agent and 1-2 parts of coupling agent; and the component B is composed of the following components according to part by weight: 100 parts by weight of modifying curing agent, 1-2 parts by weight of accelerator and 0.1-0.5 parts by weight of defoamer, and wherein the weight ratio of the component A to the component B is 2: 0.8-1.2. In addition, the invention also relates to the application of the epoxy adhesive as an adhesive for aroad surface coating. The flexible epoxy adhesive of the invention not only keeps good mechanical properties of the epoxy resin, but also has excellent properties as quick curability at normal temperature, excellent ageing resistance, low temperature resistance, good flexibility, high elongation at break and the like. Besides, the road surface coating formed from the flexible epoxy adhesive and abrasive aggregates is anti-skid and wearable, high in road surface comfort, excellent in durability, economic and environment-friendly, etc.

The invention discloses a method for preparing non-fired ceramsite from electroplating sludge. The method comprises the following raw materials: 5 to 15% of Portland cement, 10 to 70% of fly ash, 5 to 40% of ground fine mineral waste residue, 10 to 20% of ground fine steel slag, 0 to 3% of quicklime, 0.3 to 1% of ferrous sulfate, 0 to 3% of gypsum powder, 2 to 10% of electroplating sludge (on a dry basis) and 0.1 to 0.3% of a density adjusting plasticizer. The method comprises the following steps: fully mixing the above raw materials except electroplating sludge in advance; then adding original electroplating sludge and water and carrying out rolling and uniform mixing under stirring; and then carrying out granulation and natural maintenance. The non-fired ceramsite prepared in the invention has bulk density, strength and water absorption rate meeting requirements prescribed in Lightweight Aggregate and Testing Methods thereof GB / T17431-2010, and the leaching concentrations of heavy metals like chromium are lower than limited values of V-class surface water prescribed in Environmental Quality Standards for Surface Water GB3838-2002; and the method can realize safe disposal and recycling of electroplating sludge.

The invention relates to a purifying method of N-methylpyrrolidone, comprising the following steps: absorbing aminomethane from N-methylpyrrolidone to be purified through an activated-charcoal column; then removing water through a molecular sieve column; and finally removing solid particulates through ultrafiltration to obtain a finished product. The purifying method of N-methylpyrrolidone is used for purifying the N-methylpyrrolidone by utilizing a solid (activated charcoal and a molecular sieve) absorbing method instead of a distillation method. The method has simple process route and easy operation; the activated-charcoal column is used for removing the aminomethane in the N-methylpyrrolidone so that the content of the aminomethane reach below 0.005 percent, and the molecular sieve column ensures that the water content in the N-methylpyrrolidone is lowered to below 0.01 percent, thereby efficiently removing impurities. The N-methylpyrrolidone purified by the method has stable quality, high yield of at least 95 percent and low manufacturing cost; and the activated charcoal and the molecular sieve are recyclable after losing efficacy, thereby having the advantages of cost saving and environment protection.

The invention provides an ultraviolet light and ozone coordinated luminosity counteraction method for measuring the total nitrogen and total phosphorus of water. The invention can solve the problem of the prior method that the real-time measuring can not be taken, the analyzing time is long, the analysis process is numerous and diverse, the measuring condition is harsh and the energy consumption is big, in particular that secondary pollution can be produced. Flow injection method and cavitations effect and ozone oxidation coordinated water sample counteraction method is adopted in the invention, the organic nitrogenous and inorganic nitrogen in the water sample are transformed into nitrate under the normal temperature and pressure, the phosphates of the water sample are transformed into normal phosphates; and lastly, the phosphates and the normal phosphates are measured by an ultraviolet visible light measuring system and the index of the total nitrogen and total phosphorus of water can be obtained.

The invention provides a biochar-based soil structure conditioning agent and an application method thereof and relates to the field of soil environment management. A preparation method provided by theinvention comprises the following steps: adding solid-state raw materials for preparing the structure conditioning agent into each 100 parts of soil by weight, wherein the solid-state raw materials comprise biochar, a plant fiber material, lava rock, earthworm cast, humic acid, bentonite and a salt-resisting and alkali-resisting microorganism bacterium agent; alternately mixing a polyacrylamide solution and a raw material solid mixture with soil until a conditioning agent soil aggregate with the grain diameter of (0.25 to 10)cm is generated by grains of the soil. According to the preparationmethod provided by the invention, the formation of a soil aggregate structure can be remarkably promoted; meanwhile, the biochar-based soil structure conditioning agent has an excellent application effect in the aspects of keeping the stability of the aggregate structure, promoting the growth of crops, improving the yield of the crops and the like.

The invention discloses a Chinese herbal medicine additive for improving the fertility of sow. The Chinese herbal medicine additive comprises, by weight, 2-10 parts of herba leonuri, 2-10 parts of eucommia ulmoides, 2-10 parts of herba epimedii and 1-5 parts of Himalayan teasel roots. The invention further discloses a method for preparing the Chinese herbal medicine additive. The Chinese herbal medicine additive and the method have the advantages that the Chinese herbal medicine additive is scientific in combination and has obvious effects of preventing diseases and protecting health of the sow, improving the production performance of animals, improving the quality of animal products and the quality of fodder and the like; the effects of preventing the diseases and protecting the health of the sow are mainly represented in the aspects of enhancing the immunity of the sow, inhibiting bacteria, expelling parasites, regulating functions of the sow and the like; the effect of improving the production performance of the sow is mainly represented in the aspects of promoting the growth of the sow, promoting the development of the reproductive organs of the sow, increasing a pregnancy rate and a farrowing rate and reducing a piglet mortality rate; the effect of improving the quality of fodder is mainly represented in that the Chinese herbal medicine additive has effects of supplementing nutrition, enhancing aroma and deodorizing, preventing mildew and rotting and the like, accordingly, the nutrition of the fodder is improved, the appetite of the sow is promoted, the shelf life of the fodder is prolonged, and the like.

The invention belongs to the technical field of material science and soft robot driving, and particularly relates to a preparation method of large-strain quick-response electrothermal driving carbon nanotube fiber artificial muscles. The invention provides a preparation method of fiber artificial muscles by mixing a variable hydrophilic-hydrophobic polymer and carbon nanotube fibers, and the method is applied to the field of intelligent robots. The preparation method comprises the steps of preparing spinnable carbon nanotube fibers, and compounding the spinnable carbon nanotube fibers with thevariable hydrophilic-hydrophobic polymer through a composite doping method to prepare quick-response composite carbon nanotube fiber artificial muscles; and controlling the stretching and retractingof the quick-response composite carbon nanotube fiber artificial muscles in an electric heating driving mode, and introducing water mist into the quick-response composite carbon nanotube fiber artificial muscles, so that the purpose of large-strain quick response is achieved.

The invention discloses a 2, 5-furandicarboxylic acid preparing method. The 2, 5-furandicarboxylic acid preparing method comprises adding a mixture of reaction substrate and a double-component solventsystem into a reactor, then adding in catalysts and alkali, sealing up the reactor, then passing the reactor through a gas source containing oxygen, heating the reactor for reaction to obtain 2, 5-furandicarboxylate, and after the reaction is completed, regulating the pH of reaction liquor with concentrated hydrochloric acid to obtain 2, 5-furandicarboxylic acid. The 2, 5-furandicarboxylic acid preparing method is high in concentration of the reaction substrate as well as yield and purity of target products, energy-efficient and environmentally friendly, thereby having a good application prospect.

The invention relates to a fabricated self-insulation single face laminated shearing force wall board and a casting method thereof. The casting method includes the steps that a laminated shearing force wall rebar framework and a basalt fiber reinforced polymer (BFRP) rib mesh piece in an outer wythe precast wall board are correspondingly bonded and manufactured, and insulation connecting parts arefixedly bonded on the rebar framework; and the rebar framework is placed on a protective layer cushion block of a casting framework platform, inner wythe wall board concrete is cast, the inner wytheprecast wall board after the inner wythe wall board concrete is cured to design strength is overturned by 180 degrees and moves to the upper part of another casting framework platform, the BFRP rib mesh piece is placed on a protective layer cushion block of another casting framework platform, outer wythe foam concrete is casted, the insulation connecting parts are pressed into the outer wythe concrete before initial set of the outer wythe foam concrete, and formwork stripping is conducted when the strength is reached. According to the fabricated self-insulation single face laminated shearing force wall board and the casting method thereof, a BFRP is treated as a bar material of the built-in mesh piece in the outer wythe wall board and a material of the connecting parts, the good thermal insulation performance of outer wythe foam concrete boards can be guaranteed, and stress requirements of the laminated wall board can also be met.

The invention provides a method for preparing 3-hydroxypiperidine through liquid phase catalytic hydrogenation of 3-hydroxypyridine. The method includes the following steps: 1, adding the 3-hydroxypyridine, a ruthenium-carbon catalyst and pure water into a high-pressure reaction kettle, injecting nitrogen to discharge air in the kettle and injecting hydrogen to discharge the nitrogen in the kettle; 2, performing a liquid phase catalytic hydrogenation reduction reaction at the temperature of 140 DEG C under the pressure of 4.0MPa, filtering and recycling the ruthenium-carbon catalyst, performing reduced pressure distillation on filter liquor obtained after filtering, and collecting distillate to obtain the 3-hydroxypiperidine. The 3-hydroxypyridine serving as a raw material, ruthenium carbon serving as a catalyst and the pure water serving as a solvent are subjected to catalytic hydrogenation reduction to be composited into the 3-hydroxypiperidine, conversion rate reaches 100% and yield reaches above 95%; compared with a conventional reduction method in which rhodium carbon serves as the catalyst or methyl alcohol serves as the solvent, the method has the advantages of low cost, high yield and high quality.

The invention discloses an antistatic water-borne UV coating. The antistatic water-borne UV coating is characterized by being processed by the following raw materials in parts by weight: 30-40 parts of urethane acrylate resin, 20-40 parts of waterborne unsaturated polyester acrylate resin, 5-10 parts of polyvinyl alcohol, 1-1.5 parts of a photoinitiator, 0.2-0.5 part of a flatting agent, 2-4 parts of a cosolvent, 3-5 parts of an antistatic agent, 3-5 parts of rutile titanium dioxide and 100-200 parts of water, wherein the photoinitiator is 2-hydroxyl-2-methyl-1-phenyl-acetone; the flatting agent is polyether-polyester-modified organosiloxane; the antistatic agent is ethoxylation alkylamine; and the purity specification of the cosolvent is analytically pure. The antistatic water-borne UV coating disclosed by the invention has the advantages of good hardness, good abrasive resistance, antistatic electricity, economy and environmental friendliness.

The invention provides a preparation method of a fluorescent carbon quantum dot. The method comprises the following steps: a, taking sorbose as a carbon source, adding the sorbose into a mixed solution of ethanol and water, and fully carrying out mixing, wherein the ratio of the sorbose to the mixed solution of ethanol and water is (0.5-4g):50mL, and the volume ratio of the ethanol to the water is1:(1-3); b, putting the mixed liquor obtained in the step a into a reaction kettle, carrying out a hydrothermal reaction for 2-8 hours at a temperature of 170-200 DEG C, carrying out cooling to roomtemperature after the reaction is finished to obtain a reaction liquid; c, filtering the reaction liquid, and placing the filtered reaction liquid in a dialysis bag for dialysis for 1-3 days to obtaina water solution of the target carbon quantum dot; and d, carrying out vacuum drying on the water solution of the carbon quantum dot to obtain the target carbon quantum dot. According to the preparation method, the sorbose is taken as a carbon source, so that the preparation method has the advantages of simple synthesis process, easy control of conditions and the like, and the prepared carbon quantum dot has good fluorescence stability and wide adjustable range of light-emitting wavelength.

The invention discloses a process for recycling and regenerating lithium cobalt oxide in a waste lithium cobalt oxide battery, which comprises the steps of firstly separating a collector and a cathodematerial in a positive pole plate of the lithium cobalt oxide battery by using an organic solvent N-methyl-2-pyrrolidinone (NMP), then removing residual impurities such as acetylene black and polyvinylidene fluoride (PVDF) in the cathode material by means of calcination, leaching cobalt and lithium elements in the cathode material by citric acid, and finally directly regenerating LiCoO2 from a leaching solution by adopting a sol-gel method, wherein citric acid plays a dual role of a leaching agent and a chelating agent in the process. According to the invention, a one-step technology route coupling an organic acid leaching method and a sol-gel method is adopted to recycle and regenerate LiCoO2, thereby avoiding the damage of organic acids to the environment, simplifying the recycling andregenerating process, reducing the cost, and achieving harmless treatment requirements while recycling the waste lithium cobalt oxide battery.

The invention relates to a fern spore propagation method, which belongs to the technical field of fern spore propagation. In autumn and winter, in a simple greenhouse, a household fish tank is used for heating a potted spore which is immersed in the water through a constant-temperature heating bar so as to maintain an optimum sprouting temperature (about 25DEG C) of the spore and to promote the sprouting of the spore; in a seeding process, no sterilization is needed, and no special management is needed in a maintenance process; and the average yield of spore seedlings per pot is 142. Base materials are simple to prepare, the operation method is simple and feasible, technical difficulties in the spore propagation process can be solved, the seeding and maintenance process is environment-friendly, a great amount of ferns can be propagated, and high economic benefit can be created. The method can be popularized to the spore propagation of other ferns, and a high popularization and application value can be realized.

The invention discloses a multifunctional low-density curing working solution system which is prepared from the following components in parts by mass: 100 parts of waste drilling fluid, 30-70 parts ofa curing agent I, 10 parts of a curing agent II, 1-5 parts of a flexibilizer, 1-6 parts of an activating agent, 0.5-5 parts of a strength enhancer, 0.1-3 parts of an anti-pollution agent, 0.1-3 partsof diluent and 0.1-3 parts of a suspension stabilizer, wherein the curing agent I is blast furnace slag; the curing agent II is pumice powder; the flexibilizer is a mixture of modified basalt fibersand rubber latex; the activating agent is sodium hydroxide or potassium hydroxide; and the strength enhancer is sodium metasilicate nonahydrate, calcium sulfate, sodium carbonate or a mixture thereof.The multifunctional low-density curing working solution system disclosed by the invention has the characteristics of low temperature early strength, low elasticity modulus, high cementing between twointerfaces, excellent plugging effect and the like, is low in cost, environment-friendly and convenient in site construction and has wide market application prospects.

The invention provides a fire extinguishing diaphragm capable of actively inhibiting thermal runaway of a lithium battery as well as a preparation method and application of the fire extinguishing diaphragm. The fire extinguishing diaphragm capable of actively inhibiting thermal runaway of a lithium battery comprises a diaphragm substrate and a micro-capsule fire extinguishing agent which is uniformly loaded on one surface or two surfaces of the diaphragm substrate. According to the preparation method, the micro-capsule fire extinguishing agent of a core-shell structure is formed with an organic or inorganic phase change material as a shell material and a liquid fire extinguishing agent or a cooling agent as a core material, and meanwhile, the micro-capsule fire extinguishing agent is directly loaded on the two surfaces of the diaphragm substrate. The precedent that the fire extinguishing agent is directly applied to the interior of a battery is created. Therefore, the thermal stability of the diaphragm material is greatly improved while the electrochemical performance of the diaphragm is ensured. The fire extinguishing diaphragm capable of actively inhibiting thermal runaway of a lithium battery has a huge application prospect in the field of lithium ion battery diaphragm materials, and is beneficial to promoting large-scale popularization and application of the lithium ion battery.

The invention discloses a preparation method of phosphogypsum slag-based cement. The method comprises the following steps: 1, carrying out neutralization reaction treatment on phosphogypsum by using lime; step 2, drying, dehydrating and grinding the prepared phosphogypsum; and 3, uniformly mixing the prepared phosphogypsum with ultrafine blast furnace slag, a Portland cement clinker and a coagulant according to a mass ratio of (15-20%):(75-85%):(1-5%):(1-2%) to obtain the phosphogypsum slag-based cement material. Compared with the prior art, the method has the advantages of turning waste intowealth, being economical and environmentally friendly and the like, and is simple in preparation process, easy to operate and low in cost. The prepared phosphogypsum slag-based cement is high in compressive strength, short in setting time, low in cost, energy-saving and environment-friendly, and has a wide application prospect.

The invention provides a steel slag compound fertilizer and a preparation method thereof, and relates to the technical field of environment-friendly agriculture. The preparation method includes the following steps: 1) accurately weighing steel slag, mineral slag and dust ash according to the mass ratio of the steel slag to the mineral slag to the dust ash of (30-80):(0-60):(10-30), adding the weighed raw materials into a stirring machine, and performing stirring at the speed of 150-250 r / min for 5-15 min; 2) adding a fertilizer effect correction agent according to the element proportioning requirement of total nutrients N+P2O5+K2O of >=25%, wherein the correction agent is one or a combination of two or more selected from urea, ammonium hydrogen phosphate, ammonium dihydrogen phosphate andphosphorous-containing gypsum, adding the weighed various raw materials into a stirring machine, and performing stirring at the speed of 150-250 r / min for 5-15 min to obtain a crude compound fertilizer; and 3) performing coating to obtain the finished product. The steel slag compound fertilizer prepared by the method has the characteristics of a good fertilizer effect and a long release period ofthe fertilizer effect, can reach current standard GB 21633-2008 of compound fertilizers, and reduce the land occupation and environmental pollution of metallurgical solid waste, and has the advantagesof a simple process, less investment, and better economic, ecological, environment-friendly, and social benefits.

The invention relates to a method and a device for producing an extruded polystyrene board (XPS). During production, materials are added into a primary screw rod, the materials are compressed and plasticized by the primary screw rod and are extruded into a secondary screw rod through a material channel, and a foaming agent is filled into the front section of the secondary screw rod. The method is characterized in that a graphite particle paste flame retardant is injected into the front section of the secondary screw rod, the materials, the foaming agent and the graphite particle paste flame retardant are mixed and cooled and pushed into a mold through the secondary screw rod, and finally, the mixture is ejected out of the mold so as to form a finished product. The addition of the graphite particle paste flame retardant can be increased as much as possible under the condition that the production requirements are met, the utilization efficiency of the flame retardant is improved, the flame retardant property of the product is improved, and the method has the advantages of high economical efficiency and environment friendliness.

The invention provides a preparation method of polycarbonate powder. The preparation method comprises the following steps of: under the condition of stirring, adding the polycarbonate powder based on water as a medium; dripping a polycarbonate solution at the temperature of 40-60 DEG C, wherein the polycarbonate solution is a polycarbonate dichloromethane solution prepared by a phosgene interface polycondensation method; after dripping, further heating for desolventizing, and recovering dichloromethane at the same time; and after desolventizing, crushing slurry by a crushing pump, and then carrying out solid-liquid separation to obtain wet polycarbonate powder and mother liquor, wherein the mother liquor can be recycled; and drying the wet polycarbonate powder to obtain the product. The preparation method has the advantages of simple equipment, mild operation conditions and low energy consumption, the mother liquor can be recycled, and industrialization is easily realized.

The invention discloses a device for quickly lifting and clearing a crucible of a vacuum furnace. The device for lifting and clearing the crucible of the vacuum furnace comprises a furnace body. A furnace door is arranged on the left side of the furnace body, and can horizontally move on a furnace door guide rail; the crucible is connected with the furnace door, and can horizontally move along with the furnace door; a lifting machine horizontally runs on a crane rail; limiting stoppers are arranged on two ends of the crane rail; a motor is arranged on a crucible clearing device, so that the positive and negative turning of a crucible rack can be controlled; and a dust collection device comprises a gas-collecting hood, an induced draft fan, a ventilating pipe and a purifier. The device for lifting and clearing the crucible of the vacuum furnace provided by the invention has the advantages that after alloy smelting is finished, the lifting machine can be accurately and quickly utilized for lifting the crucible and putting the crucible into the crucible clearing device, waste heat of the crucible is utilized for quickly clearing alloy adhered to a wall of the crucible, and the dust collection device can be used for purifying waste gas produced during the crucible purifying and clearing process, so that the efficiency is high, the clearing speed is quick, the energy loss is saved, and the economy and the environment protection in use are realized.

The invention discloses a deep foundation pit construction method for keeping underground water dynamically balanced. The deep foundation pit construction method comprises the following steps that a booster pump is provided, the inlet end of the booster pump is connected with a water pumping pipe, and the outlet end of the booster pump is connected with a recharge pipe; in the process of excavating earth and stone to form a foundation pit, a plurality of water collecting wells and a plurality of recharge wells are drilled and tapped in the adjacent region around the foundation pit, and the relative distance between the recharge wells and the foundation pit is larger than the relative distance between the water collecting wells and the foundation pit; and the water pumping pipe stretches into the water collecting wells, then the recharge pipe stretches into the recharge wells, and the underground water collected in the water collecting wells is recharged to the underground through the recharge wells till excavation construction of the foundation pit is finished. By the adoption of the technical scheme, the underground water gushing in the foundation pit excavation process is pumpedout in time, the pumped underground water is recharged to the region around the foundation pit in time, damage to the underground soil structure is reduced, the risk of sedimentation of the foundationpit and building facilities around the foundation pit is reduced, and the ecological environment is kept.

The invention provides a method for preparing a heterogeneous Fenton-system high-stability solid catalyst. The method comprises the following steps: (I) preparing a mixture having the following compositions: alumina hydrate having a particle size greater than 200 meshes, soluble iron salts, completely burnable carbonaceous materials having respectively particle sizes of 20-60 meshes and 60-300 meshes at a weight ratio of (1:3)-(3:1) and an aqueous solution of nitric acid; (II) adding an appropriate amount of deionized water into the mixture obtained in the step (I) while mixing so that the mixture are fully mixed and uniformly kneaded and soluble iron salts are promoted to be fully wetted and impregnated on alumina hydrate and carrying out extrusion molding; and (III) calcining the molded mixture obtained in the step (II) for 1-6 hours at 900 DEG C. The heterogeneous Fenton-system high-stability solid catalyst prepared by the method, which is disclosed by the invention has the advantages of uniform distribution of active components, high loading capacity, large specific surface area, high activity, stable performance and the like.

The invention relates to a combined type ultrasonic cleaning device with the intelligent frequency conversion control function and an application method of the combined type ultrasonic cleaning device. The combined type ultrasonic cleaning device comprises an ultrasonic generator and an ultrasonic cleaning tank set. The ultrasonic cleaning tank set is formed by combining ultrasonic cleaning tanks of multiple specifications. When one of the ultrasonic cleaning tanks is selected and used, a plurality of ultrasonic probes are installed on the side wall of the ultrasonic cleaning tank, the ultrasonic generator is intelligently controlled by a frequency converter according to instructions of a control module to generate ultrasonic of different power, the ultrasonic is transmitted to the ultrasonic probes respectively through leads, and the ultrasonic probes generate powerful ultrasonic oscillation in the ultrasonic cleaning tank, wherein the powerful ultrasonic oscillation is used for completely cleaning objects to be cleaned. The ultrasonic cleaning tanks of the appropriate specifications can be selected in the ultrasonic cleaning tank set according to the shapes and the sizes of objects to be cleaned, ultrasonic oscillation cleaning can be conducted by matching the volume shape of the optimal ultrasonic cleaning tank with the optimal cleaning power of the ultrasonic oscillation, and the combined type ultrasonic cleaning device has the advantages of being efficient, economical, environmentally friendly, capable of saving energy and the like.

The invention discloses a method of treating oil sludge with a surfactant, which comprises a step of washing the oil sludge with an aqueous solution of cholate to complete the treatment of the oil sludge. In the invention, a feed-grade bio-surfactant cholate is used for treating the oil sludge. The cholate has the advantages of bio-surfactant diversity, a high surface activity, a low toxicity, a high emulsification capability and a high selectivity and is easy to degrade by microorganisms and can overcome a defect that the bio-surfactant is high in cost. The bio-surfactant can reduce damage of the oil sludge to environment and soil. The cholate is less in use amount in a thermochemical washing process of oil sludge and is low in required temperature. The waste water is easy to degrade and is not liable to cause secondary pollution. The treatment method is simple in operation, is low in energy consumption, is in conformity with a strategy of sustainable development of our country and is economical and environmental-protective.

The invention discloses a cultivation method for Chinese yam. The cultivation method comprises the following steps: (1) field selecting and preparing, namely, performing deep ploughing in winter after a field is selected, plowing and raking the field at the beginning of spring, ridging, and covering a ridge surface with a black film; (2) planting; (3) covering; (4) field management; (5) pest preventing and controlling, namely, preventing and controlling according to incidence. According to the cultivation method, after the basal parts of stems of the Chinese yam are planted, straw matting is adopted for covering and insulating heat, which replaces the traditional plastic film, and has the advantages of being economic and environment-friendly; the straw can be reused, so that the investment cost is reduced, and the economic benefit is improved; after seedlings come out, a low and short bracket is erected; through the combination of the bracket and the straw matting for insulating heat, the investment cost is reduced compared with the existing plastic greenhouse; moreover, the bracket is low, so that the impact force of wind to a greenhouse frame is low; therefore, the cultivation method can be applied to the environment with strong wind in north-west.

The invention discloses a chromium-contaminated soil repair agent and a preparation method thereof and belongs to the technical field of soil repair. The chromium-contaminated soil repair agent is prepared from the following components in parts by weight: 10-30 parts of hydroxy calcium phosphate, 5-15 parts of sodium carbonate, 6-15 parts of palmitic acid, 5-15 parts of zeolite, 10-20 parts of calcium chloride, 5-15 parts of ground steel slag, 6-16 parts of ground mineral slag, 4-16 parts of ferrous sulfate, 10-20 parts of epoxy resin and 6-16 parts of calcium lignosulfonate. The invention also discloses a preparation method of the chromium-contaminated soil repair agent. A curing agent disclosed by the invention not only has good gelling property, but also has reductibility, the cured soil has certain strength, dissolution of hexavalent chromium and total chromium in contaminated soil can be effectively reduced, without rebounding along with time, and the curing agent can be used forroadbed bricks and the like and has the characteristic of being economical and environmentally friendly.

The invention discloses a multifunctional willow photo frame. The photo frame comprises an outer frame, an inner frame, a protective film, a support leg, a fixed plate, a writing and drawing apparatus, and a calendar apparatus. The inner frame adopts a rectangular hollow bottomed structure made of solid wood; the support leg is hinged to the middle of the lower part of the back side of a bottom plate; a transverse rod is nailed in the middle of the front end of the inner frame in a left-right direction; a vertical rod is nailed between the middle of the transverse rod and the middle of the front end of the lower side of the inner frame; a rolling shaft I is hinged between the left side of the upper part of the vertical rod and the middle of the front end of the left side of the inner frame; a rolling shaft II is hinged between the left side of the lower part of the vertical rod and the lower part of the front end of the left side of the inner frame; a photo is inlaid in a rectangular frame formed by the transverse rod and the front end of the upper part of the inner frame; the writing and drawing apparatus is inlaid in a rectangular frame formed by the transverse rod, the vertical rod and the front end of the lower right corner of the inner frame; and the calendar apparatus is mounted in a rectangular region formed by the transverse rod, the vertical rod and the lower left corner of the inner frame. The multifunctional willow photo frame disclosed by the invention is economic, environment-friendly and durable, and achieves the purposes of multiple functions and intelligentization.

The invention relates to cloud paraffin, which belongs to the technical field of emulsion paraffin for buildings. The cloud paraffin comprises the following raw materials in parts by weight: 10-25 parts of mixed paraffin, 5-15 parts of compound emulsifier, 5-15 parts of assistant emulsifier, 0.5-2 parts of optical brightener, 1-2 parts of stabilizer and 50-80 parts of water. The cloud paraffin has the advantages that, as raw materials selected in the formula are reasonable and a solvent does not need to be used, the economy and the environmentally-friendly effect are reflected, the ideal surface luster effect can be obtained by being applied on granite or marble and the cloud paraffin is conductive to significantly improving the flatness and the smoothness of the surface of stone.