62results about How to "Act as an oxygen barrier" patented technology

The invention discloses a pulverized fuel ash-cement foam material for controlling the spontaneous combustion of coal and a preparation method of the pulverized fuel ash-cement foam material. The pulverized fuel ash-cement foam material is prepared from the following components by weight: 10-40 % of sulfoaluminate superfine cement, 10-40 % of pulverized fuel ash, 0.5-0.9 % of carboxymethyl cellulose, 0.1-0.6 % of sodium fluoride, 0.2-0.6 % of melamine, 0.1-0.4 % of aluminum sulfate, 0.3-0.6 % of lauryl sodium sulfate, 0.4-0.6 % of sodium dodecyl benzene sulfonate, 0.5-0.8 % of saponin and the balance of water. The foam material is high in expansion rate of foam, long in stabilizing time, low in rate of water loss, good in plugging performance, and very suitable for extinguishment underground a coal mine. The pulverized fuel ash-cement foam material has the advantages of being low in cost, good in plugging performance, high in strength, simple to construct and the like.

The invention discloses an inorganic salt type inhibitor for preventing and controlling spontaneous combustion of residual coal in a goaf of a coal mine, which belongs to the field of fire prevention and extinguishment in the goaf of the coal mine. The inorganic salt type inhibitor consists of sodium bicarbonate, calcium bicarbonate, calcium chloride, magnesium chloride, sodium chloride and zinc chloride according to a certain proportion by weight. The average inhibiting rate of the inorganic salt type inhibitor can achieve 85%, and the inhibiting effect is ideal. When in use, the inhibitor is covered on the surface of the residual coal in the goaf, thereby achieving the effects of preventing and controlling the spontaneous combustion of a coal layer in the region for a long time. The dusting method of the inorganic salt type inhibitor for fire prevention and extinguishment is safe and stable, the process flow is simple, the operation is convenient, the initial investment is low, and the using cost is relatively low. The fire prevention and extinguishment technology of the inorganic salt type inhibitor which has thermal instability and can release inert gas carbon dioxide has broad application prospects in the work of preventing and controlling the spontaneous combustion fire disasters of the coal layers. The inorganic salt type inhibitor is applicable to the fire prevention and extinguishment in the goaf of the coal mine.

The invention belongs to the field of coal flame-retardant dust suppressants. The invention specifically discloses a nitrogen-phosphorus-silicon synergistic coal flame-retardant dust suppressant and apreparation method thereof. The nitrogen-phosphorus-silicon synergistic coal flame-retardant dust suppressant comprise the following components: 0.08 to 0.12 part of a phosphorus-based flame retardant, 0.10 to 0.14 part of a nitrogen-containing silane coupling agent, 0.01 to 0.05 part of an aldehyde compound, 100.0 to 200.0 parts of a solvent, 0.18 to 0.36 part of a silicon flame retardant, 0.1-0.4 part of a pH regulator, 83.0 to 125.0 parts of deionized water, 57.0 to 95.0 parts of alcohol, 1.0 to 2.0 parts of a natural polymer, 10.0 to 20.0 parts of a monomer, 4.0 to 8.0 parts of a pH buffer agent, 0.1 to 0.4 part of an initiator, 0.02 to 0.08 part of a cross-linking agent, 0.2 to 0.4 part of a surfactant and 0.2 to 1.0 part of a plasticizer. The preparation method comprises the following steps: grafting a nitrogen-containing silane coupling agent onto phosphorus flame retardant molecules by using an aldehyde compound, then hydrolyzing the silicon-based flame retardant, carrying outdehydration reaction between hydroxyl groups on the hydrolyzed silicon-based flame retardant and surface hydroxyl groups on the silicon-based flame retardant to obtain a nitrogen-phosphorus-silicon synergistic flame retardant, and finally organically combining the nitrogen-phosphorus-silicon synergistic flame retardant with dust suppression components such as a natural polymer, a monomer, glycerol and a surfactant in the same system through a polymer free radical polymerization reaction, so that the flame retardant has flame retardance and dust suppression properties.

The invention relates to the technical field of artificial board preparation, and in particular relates to a preparation method of a refractory moisture-proof wheat straw board. The preparation methodprovided by the invention comprises the following step of taking rice straw and wheat straw as raw materials to prepare modified straw fragments, and adding methyl triethoxysilane into a flame retardant material, processing to obtain silica gel microencapsulated ammonium polyphosphate, mixing a modified soybean protein adhesive with the silica gel microencapsulated ammonium polyphosphate to obtain a flame retardant adhesive, and finally, bonding and hot-pressing wheat straw board layers to obtain the wheat straw board. According to the preparation method provided by the invention, a silica gel microencapsulated ammonium polyphosphate is prepared by wrapping ammonium polyphosphate with the silica gel, thus improving the thermal stability of ammonium polyphosphate. In addition, ammonium polyphosphate can co-decompose with the protein adhesive in a high temperature combustion process to form metaphosphoric acid, and prevent oxygen and heat from further diffusing into the polyurethane foam, thus improving the refractory and flame retardant properties of the wheat straw board; methoxy groups and amine substances in the protein adhesive react to form potassium methyl silicate, and forma waterproof mineral film on the surface of the straw board, and broad application prospect is obtained.

The invention discloses an environment-friendly adding type polyethylene flame-retardant masterbatch. The masterbatch comprises the following raw materials by mass: 10 parts of carrier resin, 15 parts of chlorinated polyethylene, 28 parts of decabromodiphenylethane, 10 parts of antimony trioxide, 3-10 parts of TBC (tri-N-butyl citrate) flame retardant, 12 parts of flame retardant synergist, 5-15 parts of MCA (melamine cyanurate) flame retardant, 8 parts of lubricating agent and 1 part of antioxidant. The polyethylene flame-retardant masterbatch is environment-friendly, non-toxic, clean and sanitary. The flame retardant efficiency is obvious; the processing performance is excellent; when the masterbatch is used for producing polyethylene products, the addition is low, so that the production cost for the polyethylene material can be greatly reduced; the polyethylene flame-retardant masterbatch is suitable for development of enterprises.

The invention provides a method for retaining freshness of fresh cocoons and relates to a preservation method. The method comprises the following steps: placing inactivated fresh cocoons into a tent with six sealed surfaces; removing oxygen-enriched air from the tent; introducing carbon dioxide; and circularly air-drying, wherein water in a recycling gas channel is absorbed by a drying agent, the temperature in the tent is adjusted to be 10 to 25 DEG C, the fresh cocoons in the tent is circularly dried and the water of pupae in the circularly dried fresh cocoons is reduced to 15 percent. The invention researches and develops a new method for retaining freshness of the fresh cocoons, so that a fresh cocoon silk reeling process can be performed successfully and the problems of high energy consumption and atmospheric pollution in the traditional cocoon drying process. The device, the drying agent and the carbon dioxide adopted by the method are low in cost and pollution-free; the carbon dioxide is recycled, so the cost is saved greatly; a preservative is not added in the whole process, so guarantee is brought for the pupa processing, the silk quality is not changed and silk reeling is promoted.

The invention discloses a small dimension integrated wooden pillar and a production method thereof. The small dimension integrated wooden pillar comprises an insert lath (2) and a lath (3), a mortise (4) and a tenon (5) are arranged on each of the side surfaces of the insert lath (2) and the lath (3), the insert lath (2) and the lath (3) are connected end to end, and thus an annular lath group (1) is formed. The small dimension integrated wooden pillar is simple to assemble, dislocation is hardly caused, surface does not need to be rounded, flame retardance is good, strength is high, cost is low, and demand for wood structures also can be met.

The invention relates to the technical field of preparation of building materials, in particular to a preparation method of a flame-retardant foam composite board. According to the preparation method,methyl triethoxysilane is added to an alkalified flame retardant to obtain silica gel microencapsulated ammonium polyphosphate; a modified soybean protein adhesive and the silica gel microencapsulated ammonium polyphosphate are mixed to obtain a flame-retardant adhesive; and a polyurethane foam board and a bamboo fiberboard are subjected to bonding and hot-pressing to obtain the foam composite board. Through the method, ammonium polyphosphate is cladded with silica gel; and in the burning process, metaphosphoric acid is used for dehydrating the polyurethane foam board to form a compact carbonlayer on the surface to prevent oxygen and heat from further diffusing to the interior of polyurethane foam, so that the flame retardant property of the foam composite board is improved. Formaldehydehas the functions of a stabilizing agent and a cross-linking agent; and meanwhile, the stability of modified soybean protein has the inhibition effect on release of the formaldehyde, and noxious formaldehyde cannot be released. Accordingly, the polyurethane foam board and the bamboo fiberboard are bonded more tightly. The flame-retardant foam composite board has broad application prospects.

The invention discloses a pulverized fuel ash-cement foam material for controlling the spontaneous combustion of coal and a preparation method of the pulverized fuel ash-cement foam material. The pulverized fuel ash-cement foam material is prepared from the following components by weight: 10-40 % of sulfoaluminate superfine cement, 10-40 % of pulverized fuel ash, 0.5-0.9 % of carboxymethyl cellulose, 0.1-0.6 % of sodium fluoride, 0.2-0.6 % of melamine, 0.1-0.4 % of aluminum sulfate, 0.3-0.6 % of lauryl sodium sulfate, 0.4-0.6 % of sodium dodecyl benzene sulfonate, 0.5-0.8 % of saponin and the balance of water. The foam material is high in expansion rate of foam, long in stabilizing time, low in rate of water loss, good in plugging performance, and very suitable for extinguishment underground a coal mine. The pulverized fuel ash-cement foam material has the advantages of being low in cost, good in plugging performance, high in strength, simple to construct and the like.

The invention relates to the field of flame retardant coating layers, and in particular, relates to a flame retardant coating layer applicable to the surface of a magnesium alloy and other lightweight alloys and a preparation method thereof. The flame retardant coating layer comprises the main components: an inorganic film-forming substance and an inorganic filler; the mass ratio of the inorganic film-forming substance to the inorganic filler is (35-65) to (35-65), the inorganic film-forming substance is a phosphate adhesive, and the inorganic filler is composed of a metal oxide, an alkali metal hydroxide and boric acid according to the mass ratio of (55-75) to (20-35) to (5-10). The flame retardant coating layer adopts the inorganic film-forming substance and the non-combustible filler, a proper auxiliary agent is added, and a reactive principle is applied, so that the coating layer can form a non-combustible dense inorganic 'glaze film layer' under a condition of flame or high temperature, and the effect of isolating oxygen gas is achieved. The flame retardant coating layer has the advantages of low film-forming temperature and good heat resistance, cannot be burnt when meeting fire, and can form the dense 'glaze film layer'; the surface of the magnesium alloy is coated with the flame retardant coating layer, and thus the flame retardancy of the magnesium alloy can be improved.