30results about How to "Small expansion and contraction" patented technology

The invention relates to a phase-transition self-temperature-regulating heat-preserving facing brick of an external wall, which is an integrated structure compacted by a phase-transition heat-preserving layer and an inorganic facing layer, wherein the phase-transition heat-preserving layer is mixed by proportion and compacted by hull-type expanded perlite heat-preserving aggregates, phase-transition temperature-regulating aggregates and cements; the inorganic facing layer is mixed by quartz sand, calcium carbonate, calcium oxide, cement and silicon oxide powders; and the phase-transition temperature-regulating aggregate is made of phase-transition cores and encapsulated hulls. The manufacturing method not only effectively solves the encapsulation problem of the phase-transition material, leads the prepared phase-transition self-temperature-regulating heat-preserving facing brick of the external wall to have excellent heat-preserving performance, waterproof performance and permanent anti-ageing performance, but also radically solves the obsolescence of thermo-physical property and the leakage problem of phase-transition material in the circulation process. The facing brick has the advantages of light weight, strong adhesion strength, large compressive strength, heat insulation, heat preservation, waterproof and moisture-proof performances, obvious energy-saving effect, and the like.

The present invention relates to a short fibre reinforced lime soil ground base treatment method. It is characterized by that it makes the short fibre and lime be mixed in the engineering soil so as to improve the engineering property of soil, and can be used for making ground base treatment. The fibre content is 0.05-0.5% of dried soil weight and the lime content is 1-10% of dried soil weight, the fibre length is 2mm-30mm. Said soil in which the short fibre and lime are mixed is undergone the processes of stirring, stacking and rolling so as to form the invented short fibre reinforced lime soil ground base.

The invention relates to a Portland cement foaming heat preservation board or a block and a manufacturing method thereof. The Portland cement foaming heat preservation board or the block is capable of strengthening heat insulation and heat preservation performances. The Portland cement foaming heat preservation board or the block is prepared by raw materials of, by weight, 99 parts of Portland cement, 5 parts of saturated aluminum sulfate, 1 part of water reducing agents and 0.5-1 part of hydrogen peroxide, the Portland cement, the saturated aluminum sulfate and the water reducing agents are proportionally taken and then placed in a mixer, water is added into the mixer to be mixed with the raw materials and then stirred for 5-10 minutes to prepare a foaming cement slurry, the water is added according to the weight ratio of the water to the raw materials of 100: (60-80), the hydrogen peroxide is proportionally taken, water is added to the hydrogen peroxide, the hydrogen peroxide and the water are subjected to pre-foaming to manufacture foams by means of a foaming machine, the water is added according to the weight ratio of the hydrogen peroxide to the water of 0.01: 1, the foams and the foaming cement slurry are placed into a foam stirrer for even stirring, the mixture is injected to a mold for solidification molding, and the mold is removed to obtain the density Portland cement foaming heat preservation board or the block. Portland cement enables a solidified board to form a foaming structure under the action of the hydrogen peroxide so that weight of walls is reduced, and the heat insulation and heat preservation performances are strengthened.

The invention provides a castable silicone rubber base temperature resistant shielding material and a preparation method thereof. The raw materials of the castable silicone rubber base temperature resistant shielding material comprise, by weight, 100 parts of hydroxy silicone oil, 2 to 25 parts of reinforcing agents, 2 to 100 parts of neutron protecting agents, 2 to 10 parts of crosslinking agents, and 1 to 3 parts of catalysts. The invention also provides the preparation method of the above-mentioned castable silicone rubber base temperature resistant shielding material. The castable siliconerubber base temperature resistant shielding material provided by the invention has excellent comprehensive performance, the preparation method is simple, the casting molding can be realized, and thematerial has great advantages in production, construction, installation and the like.

The invention discloses a method for improving properties of expansive soil by utilizing silica fume. The method realizes resource utilization of the silica fume by utilizing the silica fume to improve the expansive soil; the silica fume can be used for replacing or partially replacing the use of traditional expansive soil modifying agents such as lime and cement, so emission of greenhouse gases in cement and lime production processes is reduced, and the method satisfies the concept of sustainable development. The method disclosed by the invention gives an optimal mass mixing ratio of the silica fume as the expansive soil modifying agent; after the expansive soil is processed by using the silica fume of which the mixing amount is 3%, the swell-shrink characteristic of the expansive soil isobviously reduced, the improved expansive soil can maintain relatively good water stability in drying and watering circulation process and is free of surface peeling; and the improved expansive soilmeets the requirements of engineering fillers.

The invention belongs to the technical field of building materials, and particularly relates to a gypsum-based pouring mortar capable of preventing alkaline return and a preparation method thereof. The gypsum-based pouring mortar has the advantages that a water retention agent and an alkaline inhibitor are added into the gypsum to improve, and the microcrystalline cellulose is jointly used with amixed water retention agent, so that the synergistic function is realized, the usage amount is reduced, and the cost is reduced; by adopting the mixed water retention agent and the alkaline inhibitor,the alkalization of the gypsum is inhibited, and the strength of the gypsum is improved; the weight is light, the fireproof and flame-retardant properties are realized, and the appearance of a wall surface is attractive.

The invention discloses a phase-change heat storing and supplying unit. The phase-change heat storing and supplying unit comprises a heating - heat storing - heat exchanging unit which is arranged independently, the heating - heat storing - heat exchanging unit comprises a heat storing tank body, phase-change materials, a heating pipe and heat exchange coils, wherein the phase-change materials are placed in the heat storing tank body, and the heating pipe and the heat exchange coils are arranged in the phase-change material; a heat exchange device is arranged outside the heat storing tank body; an outlet of the heating pipe is connected with the heat exchange coils, outlets of the heat exchange coil are connected with an inlet of the heat exchange device, and an outlet of the heat exchange device is connected with an inlet of the heating pipe; and conduction oil is placed in the heating pipe. According to the phase-change heat storing and supplying unit, the functions of input, storage and output of heat and the like can be achieved; the cost is low, and the using range of temperature parameters is wide; the phase-change heat storing and supplying unit has the characteristics that the structure is simple, modular workshop production can be achieved, transportation is convenient, and field installation is simple and easy and can be applied to multiple fields; and the phase-change materials adopted by the heat supplying unit are alcohols, are free of supercooling and precipitation phenomenon, and have stable performance, and the phase change temperature of the phase-change materials can be adjusted between 90 to 120 DEG C.

The invention discloses a preparation method of a phase change material with palm oil as a raw material. According to the invention, palm oil is adopted as a raw material, and methanol is added; after two transesterification reactions, refined methyl ester is obtained; the refined methyl ester is separated, such that saturated fatty acid methyl ester is obtained; the saturated fatty acid methyl ester is mixed with hexadecanol according to a mass ratio of 10:1-2.5:1, such that a binary composite phase change material with phase change temperature of 22-27 DEG C and phase change latent heat of 160-190J/g is obtained. According to the invention, the prepared binary phase change material is subjected to morphological curing either by encapsulating the material with microcapsules or by compounding the material with a porous medium substrate. The material can be combined with a building material to form a composite building envelop structure with an energy-saving property. Therefore, indoor temperature difference between day and night can be effectively reduced, thermal comfort can be improved, and energy consumption can be reduced.

The invention discloses a method for reinforcing and improving expansive soil by using microbial composite fibers. The method comprises the following steps that microbial strains are cultured in a fermentation tank according to optimal culture conditions to form a microbial bacterial solution; the microbial bacterial liquid is mixed with mixed calcium liquid which is 1.5 times of the volume of the bacterial liquid, and mixing and stirring are carried out in a low-speed stirrer to form microbial slurry; a reinforced material is added, and the reinforced material is uniformly mixed with the expansive soil to form fiber reinforced expansive soil; and the microbial slurry and the fiber-reinforced expansive soil are uniformly mixed and stirred in batches according to the weight ratio of 1 to 5 in the low-speed stirrer according to the water content of 20%, and curing is carried out at normal temperature to obtain the improved expansive soil.

The invention relates to a thermal insulation board and a preparation method thereof. It is prepared from the following raw materials in parts by weight: 30 to 50 parts of phase change materials and 50 to 70 parts of plant fibers. Any one phase change material in calcium, n-octylic acid and butyl stearate; the plant fiber adopts crop straw, or rice straw, or asparagus, which can be obtained locally, and waste straw resources can be used to turn waste into Combining the energy storage characteristics of phase change materials to achieve energy saving and consumption reduction, the production has the advantages of fire and flame retardancy, light weight, high compressive strength, good energy saving effect, thermal insulation and sound insulation, non-toxic and harmless, and green environmental protection. .

The invention relates to a construction waste improved expansive soil roadbed structure and a construction method thereof. The bottommost layer of the structure is a gravel soil cushion layer, construction waste improved soil filler is arranged above the gravel soil cushion layer, edge covering clay is arranged on the two sides of the construction waste improved soil filler, and anti-seepage geotechnical cloth is arranged above the construction waste improved soil filler and the edge covering clay to serve as a top sealing layer. According to the physical improvement method for doping the construction waste into the expansive soil, on one hand, the expansive soil roadbed expansibility can be reduced, and on the other hand, the roadbed strength and water permeability can be improved, so that the moisture content distribution in the roadbed is more balanced, the engineering discard is reduced, the land is saved, the engineering cost is reduced, and the environmental protection is facilitated.

The invention discloses a multilayer phase-change energy-saving wallboard which is prepared from the following components in percentage by weight: mixed powder particles, chemical mixed liquid, phase-change material, additives and an organic solvent, wherein the chemical mixed liquid accounts for 5-15%, the phase-change material accounts for 2-8%, the mixed powder particles account for 25-42%, the additives account for 5-10%, and the organic solvent accounts for 10-25%. The phase-change material is added into the raw materials of the wallboard so that the overall expansion contractibility of the wall body is small, the phenomenon of supercooling or overheating is few, the heat conductivity coefficient is large, the density is large, the specific heat capacity is large, and the wallboard is overall non-toxic, non-corrosive, low in cost and convenient to manufacture.

The invention discloses a method for spraying nanometer paint on a display board, and solves the problem that a paint-sprayed material is prone to deformation due to long time high temperature baking.The method for spraying the nanometer paint on the display board is characterized by comprising the following steps that first: a medium density fiberboard soaked in maple oil is taken out, and drying and primary polishing are conducted on the medium density fiberboard; second: under-color paint is sprayed on the medium density fiberboard and then the medium density fiberboard enters a 5000KW high-temperature lamp baking box to be baked for 3 times, and each time is for 2-3 minutes; and third: UV nanometer color-repairing paint is further sprayed on the under-color paint, the medium density fiberboard enters a high-temperature lamp baking box to be baked for 2 minutes, and the deformation probability of the medium density fiberboard during baking is reduced.