255results about How to "Low volatile" patented technology

A polypropene composition with low odor and low volatile components is proportionally prepared from polypropene, talc powder, fine-porous silica gel, toughening agent poe, thermal stabilizer DSTP, thermal stabilizer 3114 and thermal stabilizer 618 through mixing, dual-screw extruding out and granulating.

The present invention relates to coal blending and coking method for metallurgical coke, and especially the coal blending and coking method with thermal coal and weakly caking coal. The present invention adopts conventional coking process and the coal consists of weakly caking coal 0-15 wt%, thermal coal 0-10 wt%, gas coal 13-45 wt%, fatty coal 9-20 wt% and coking coal 40-45 wt%. The produced coke has dropping strength M40 of 77-78.5 %, abrasion resistance strength M10 <8.6 %, reactivity of 35-37 %, thermal state strength of 45-55 %, and granularity of 25-40 mm and 40-80 mm, and meets the requirement for iron smelting in blast furnace of 1000 cubic meter or larger. The present invention has expanded coal variety range for coking, and lowered coking cost.

The invention discloses a chemical treatment method for preparing high-quality expandable graphite. The method adopts concentrated sulfuric acid as an intercalator and hydrogen peroxide as a catalyst to prepare the high-quality expandable graphite under the vacuum condition. Because water has constant boiling point under the condition of constant vacuum degree, the reaction temperature can be well controlled and simultaneously stable reaction temperature can be maintained by utilizing vacuum to bring away heat exhausted during reaction in time. The method can obtain the high-quality expandable graphite of which the volatile component is less than 12 percent and the sulfur content is less than 1.5 percent, and the sulfur content can be less than 800 ppm after the high-quality expandable graphite is treated for 30 seconds at a high temperature of between 900 and 1,000 DEG C.

The invention relates to the technical field of waste graphite recycling, in particular to a method for preparing a graphite crucible with recycled graphite. The method comprises the steps of: 1) putting pitch in a pitch melting tank at 160-180 DEG C for dehydration and settling for 72h to form moderate temperature modified pitch, 2) crushing and screening the recycled graphite and calcined coke respectively to form recycled graphite powder and calcined coke powder for future use, 3) uniformly mixing the standby recycled graphite powder and the calcined coke powder to form a mixed dry material, 4) putting the obtained mixed dry material into a mixing-kneading pot for dry mixing for 35-45min, then adding the moderate temperature modified pitch for wet mixing for 35-45min, 5) cooling mixed and kneaded paste to the room temperature, 6) grinding the aired paste into powder, 7) pressing the ground powder for forming to form a crucible blank, 8) putting the obtained crucible blank in a roasting furnace for roasting, and 9) machining the qualified roasted crucible blank. The method is simple and improves product quality.

The invention relates to a solvent-free one-component polyurethane waterproof coating in the field of waterproof materials. A formula of the solvent-free one-component polyurethane waterproof coating comprises the following components in weight percent: 5-10% of polyether EP-330N, 30-40% of polyether DL-2000D, 20-25% of diphenylmethane diisocyanate, 10-15% of self-made epoxy resin, 0.1-0.2% of an anti-aging agent, 0.1-0.5% of an ultraviolet absorber, 0.01-0.15% of a defoaming agent, 0.1-0.5% of an anti-settling agent, 0.1-0.5% of a dispersing agent, 0.1-0.15% of a catalyst, 0.5-3% of pigment, 10-15% of kaolin and 5-10% of talcum powder. The solvent-free one-component polyurethane waterproof coating provided by the invention overcomes the defects that the existing one-component polyurethane waterproof coating contains a plasticizer and a solvent, does harm to a human body and pollutes the environment and mechanical properties of a film are reduced after long-term use; and the provided solvent-free one-component polyurethane waterproof coating is anti-aging, long in service life and environment-friendly, the adhesion and water resistance of the coating are good, and mechanical properties of the film are good.

The invention provides a large-size low-temperature destructive distillation system for low-order lignite, solving the problem of industrial destructive distillation of low-order lignite. The system consists of a lignite preparation part, a drying part, a destructive distillation part, a heat source part, a semicoke cooling and transporting part and a gas and tar treatment part, wherein in the lignite preparation part, raw lignite is smashed and then fed into the drying part for drying; dried lignite particles are fed to the destructive distillation part for destructive distillation; the gas obtained after destructive distillation is dedusted and then enters into the gas and tar treatment part to be treated and then stored; air cooling is carried out on the semicoke subjected to destructive distillation and then the semicoke is discharged; the destructive distillation heat source is supplied by high-temperature smoke produced by combusting partial destructive distillation self-produced gas in a combustion furnace; low-temperature waste smoke extracted from the destructive distillation part is used as the heat carrier of the drying part; and cold air for cooling the semicoke is introduced into the combustion furnace after absorbing the heat of the semicoke for combusting the gas. The large-size low-temperature destructive distillation system is suitable for large-scale industrial continuous production, has simple equipment and is easy to implement, thereby providing an effective way for the utilization of the low-order lignite.

The invention provides a method for preparing biomass moulded coal by using biomass and inferior smokeless pulverized coal as raw materials. The biomass moulded coal is prepared by uniformly mixing the biomass, the inferior smokeless pulverized coal and additives (a sulfur fixation agent, a biomass binder, an oxidant and a waterproofing agent), and performing low-pressure compression moulding by a wet method, wherein the sulfur fixation agent is calcined lime CaO; the biomass binder is light yellow dope prepared by treating bagasse by using 1 to 2 percent sodium hydroxide solution; the oxidant is potassium permanganate; and the waterproofing agent is tar or a binder. The biomass moulded coal comprises following raw materials in part by mass: 40 to 65 parts of inferior smokeless pulverized coal, 25 to 55 parts of biomass and 5 to 10 parts of additive. The biomass moulded coal has the advantages of low cost, low ignition point, high burn-off rate and integrative desulfurization and water proofing performance, and has great significance of energy conservation and environmental protection.

The invention relates to the technical field of rubber production, aiming to provide an improved nitrile rubber production process, which comprises polymerization, degassing and condensation. Raw materials including acrylonitrile, butadiene, desalinated and deoxidized water, condensed water and molecular weight regulators are fed into a polymerization position, convergence is carried out in a header pipe at the polymerization position, the converged mixture is pre-emulsified sequentially through a pipe pump and a pipe mixer, heat exchange is carried out through an ammonia-cooling heat exchanger for cooling, the cooled mixture, initiator emulsion and activator solution are sequentially fed into a plurality of reactors for polymerization to produce latex, the latex taken out of the reactorsand terminating defoamer solution are fed into a maturing reactor and are fully mixed when the rate of polymerization and conversion reaches 70 plus or minus 5 percent, and the mixture is then fed into a degassing tower to be degassed and into a condensation reactor for condensation. The problem of blockage of the heat exchanger can be avoided, the process is simple, the production process is stable and economical, the Mooney of rubber can be controlled easily, and the produced nitrile rubber has high quality.

The invention discloses a method and device for reducing volatile matters of an o-cresol-formaldehyde epoxy resin. The method comprises the following step of: performing a two-stage desolventizing step, including a coarse desolventizing step and a fine desolventizing step to remove a solvent and a high-boiling residue component from an o-cresol-formaldehyde epoxy resin. The device comprises a feed pump, a first pipeline mixer, a falling film evaporator, a gas-liquid separator, a primary removal extraction pump, a second pipeline mixer, a thin-film evaporator, a packing tower and a secondary removal extraction pump which are connected in sequence, wherein a part of an o-cresol-formaldehyde epoxy resin solution output by the gas-liquid separator returns to the first pipeline mixer through areflux pump; a steam inlet/outlet is formed in the second pipeline mixer; and both the gas-liquid separator and a film evaporator are provided with a volatile matter gas-phase outlet. According to the method and the device for reducing the volatile matters of the o-cresol-formaldehyde epoxy resin, volatile matters of a product can be reduced to be below 0.05 percent, and the performance of the product applied to an electronic molding compound can be improved remarkably.

The invention discloses a method for preparing coke by using direct coal-liquefied residue. The method comprises the following steps: S1, orderly carrying out primary hot melt-extraction, primary solid-liquid separation and polymeric modification on the direct coal-liquefied residue, so as to obtain coal-liquefied modified asphalt; S2, mixing the coal-liquefied modified asphalt with cleaned coal for coking, crushing, tamping and pressing into a cake, so as to obtain a coal briquette; and S3, conveying the coal cake to a coke burner to heat and insulate heat in isolated air, and then cooling and screening to obtain the coke. The coal-liquefied modified asphalt which is obtained from the direct coal-liquefied residue in manners of hot melt-extraction, solid-liquid separation and polymeric modification is applied to a tamping coking process, so that the coke of which all indexes achieve the first national metallurgical coke standard is obtained; the yield of qualified products can be up to over 82%.

The invention discloses thermosetting resin used for pultrusion and a preparation method of the thermosetting resin. The thermosetting resin is composed of the following components by weight percentage: 35-60% of an epoxy resin mixture, 5-15% of a flexibilizer, 35-60% of a curing agent, 0-10% of a catalyst and 0-3% of an internal releasing agent. The preparation method of the thermosetting resin comprises the following steps: uniformly dispersing the epoxy resin mixture and the flexibilizer to be used as a component A by a high-speed dispersing agent at 60 DEG C, stirring the curing agent, an accelerant and the internal releasing agent at a high speed to uniformly disperse to be used as a component B, uniformly mixing the component A and the component B at normal temperature, and finally defoaming the mixture resin in a vacuum oven to prepare a resin casting body. Compared with unsaturated polyester resin, the thermosetting resin is low in volatile component, low in pollution, good in heat resistance, strong in adhesive force, excellent in mechanical property of a cured material and wide in designable range in terms of temperature tolerance.

The invention relates to a preparation method of polychlorotrifluoroethylene resin, which adopts a horizontal reactor with an aspect ratio ≥ 1.0 as polymerization equipment; uses chlorotrifluoroethylene monomer or chlorotrifluoroethylene monomer and other comonomers The polymerization reaction occurs under constant pressure conditions, which improves the reaction speed and polymerization efficiency; the semi-mechanical and semi-chemical coagulation method is used to effectively separate the impurities in the emulsion, and the residual unstable groups are removed through wet heat treatment, effectively reducing the volatilization of the product parts, greatly improving the appearance of the product. M can be obtained by the method of the present invention _η PCTFE and its copolymerization products exceeding 500,000, volatile matter less than 0.01%, strength loss temperature higher than 260°C, yellowness index (YI) less than 10.

The invention discloses a preparation method for polysiloxane with extra high molecular weight, comprising the steps of (1) adding dimethyl siloxane or alpha, omega-dihydroxy polydimethylsiloxane intoa reactor, stirring, controlling the rotating speed being 30 to 60 revolutions per minute, heating up to 90-160 DEG C., adding catalyzer which occupies 0.001% to 0.1% by weight of raw materials and reacting for 2.0 to 6.0 hours at constant temperature, (2) at constant temperature, vacuum-pumping for 1.0 to 4.0 hours, and controlling the vacuum degree being -0.080 to -0.10 MPa, and (3) adding neutralizing agent which occupies 0 to 0.1% by weight of raw materials, heating up to 170-180 DEG C., introducing nitrogen, vacuum-pumping for 2.0 to 6.0 hours, stopping heating, stirring, discharging after cooling to room temperature to obtain the blocky or granular hydroxyl silicone oil products with extra high molecular weight. The invention can prepare the polysiloxane with molecular weight more than 1000000.

The invention discloses a coking coal blending method of a wide carbonization chamber coke oven. The method comprises a step of blending various single coking coals, wherein each single coking coal comprises the following components in percentage by weight: 16-25% of lean coal and meager lean coal, 10-20% of fat coal 1#, 17-29% of 1/3 coking coal, 15-20% of coking coal 1#, 6-20% of coking coal 2#, 5-10% of coking coal 3#, 6-10% of gas-fat coal and fat coal 2# and the balance of other random available coking coal of which the volatile component content Vdaf is less than or equal to 35%; the maximum Gieseler fluidity of the compound coal is 600-1,400ddpm; and the volatile components account for 24-27%. The method disclosed by the invention effectively reduces the coal preparation cost, overcomes adverse impact on the high-temperature flowing property of the coking coal caused by the heating speed reduction in a coking process of the wide carbonization chamber coke oven, effectively reduces the graphite accumulation speed on the oven top and improves the coke quality and the coke output.

The invention discloses double-component imine modified epoxy solvent-free impregnated resin and preparation and use methods. The double-component imine modified epoxy solvent-free impregnated resin is formed by mixing 100 parts by weight of component A and 40-80 parts by weight of component B, wherein the component A comprises the following materials in parts by weight: 100 parts of epoxy resin,10-60 parts of Cardo type bismaleimide and 0-20 parts of diluting agent; the component B comprises the following materials in parts by weight: 80-100 parts of liquid acid anhydride, 0.3-2.0 parts of initiator and 0.5-2.0 parts of microcapsule accelerator; the impregnated resin is applied to a vacuum pressure impregnation (VPI) process of a traction motor; the temperature of the impregnated resin is 40-60 DEG C; the curing and baking temperature is 140-200 DEG C; and the time is 10-20 hours. The impregnated resin has the advantages of simplicity in synthesis, cheap raw materials, low cost and superior toughness of a curing system; the synthesized resin is convenient to transport and store and has longer working life during use; the production of toxic and harmful gases is reduced during production; and the impregnated resin belongs to an environmentally-friendly product.

The invention discloses a coke making method by using low-volatile coking coal in coal blending, which comprises the following steps: 1) coke microstructure testing: carrying out single-coal coking on the low-volatile coking coal, and carrying out microstructure testing on the obtained coke; 2) single-coal coking thermal performance testing: respectively obtaining the strengths of the reference coking coal (of which the volatile content is 21-24%, the single-coal coking coarse grain mosaic structure is greater than or equal to 65%, the G value is greater than 85 and the solid softening temperature range is up to 85 DEG C above) and low-volatile coking coal subjected to coke thermal reaction, and comparing; and 3) carrying out classified blending on the low-volatile coking coal according to the coke microstructure characteristics and the single-coal coking thermal properties. The low-volatile coking coal is reasonably divided and subjected to classified blending according to the coke microstructure characteristics and the single-coal coking thermal properties; and thus, the method can effectively utilize the low-volatile coking coal resources under the technological conditions of no graded crushing, briquette technique or tamping coking, the coke quality does not deteriorate, and the CSR of the coke made by the 6m-above coke oven is greater than 65%.

The invention provides an environment-friendly type carbonaceous press material for a maintaining blast furnace hearth. The environment-friendly type carbonaceous press material comprises the following components by weight: 15-35% of electrode graphite, 20-32% of crystalline flake graphite, 4-11% of silicon carbide, 5-15% of quartz sand, 1.0-3.0% of boron carbide, and 24-35% of environmental protection modified tar, wherein the sum of the components is 100%. The various said dry raw materials, in the proportions, can be used in a production field after weighted, burdened, uniformly mixed, uniformly stirred with a liquid binder and sealedly packaged. The carbonaceous press material of the invention has advantages of good fluidity and fallibility, high density and intensity, high thermal conductivity, good anti-aggressivity to melt molten iron and slag, high temperature air-flow flushing resistance, and good anti oxidizability, and is especially in favor of raising a blast furnace life and in favor of safety production. The carbonaceous press material contains less poisonous and harmful substances like benzopyrene, and is in favor of environmental protection.

The invention relates to a preparation method of halogen-free, flame-retardant, low-smoke and low-toxin hot melt phenolic prepreg. The solid content and the viscosity-temperature flow characteristic of phenolic resin are controlled with a reasonable synthesis process; solid phenolic resin and liquid epoxy resin are mixed uniformly according to formula design, and a resin system suitable for preparation of prepreg with a hot melt process is obtained; the gelation time of the resin is controlled to range from 140 s to 250 s, a hot melt resin adhesive film is prepared from the hot melt phenolic resin system, the coating temperature is controlled to range from 40 DEG C to 65 DEG C, the hot melt phenolic resin adhesive film and unidirectional fiber or fiber fabric are composited under heating and pressurizing conditions, and the hot melt prepreg is prepared. The hot prepreg with uniform texture and stable resin content can be obtained through resin synthesis, formula design and process design, and the hot melt prepreg and the composite have the characteristics of low smoke, no halogen, low smog toxin and flame retardancy and can meet requirements for use performance of interior trimming and structural composites for high-seed railways, aircrafts, steamships and other transportation tools.

The invention relates to a deacidification type organic silicone adhesive and a preparation method thereof. The raw materials of the deacidification type organic silicone adhesive comprise alpha, omega-dihydroxydimethylpolysiloxane, hydrotalcite, filler, a plasticizer, a crosslinking agent and a catalyst, the deacidification type organic silicone adhesive has excellent adhesion and low corrosion to adhered materials, the volatile matters of the used raw materials are few, and meanwhile the deacidification type organic silicone adhesive also has efficient, environmental-friendly, nontoxic and halogen-free flame retardant properties..