56 results about "Azodicarbonamide" patented technology

The invention discloses a high-weatherability sound insulation wood plastic wallboard and a preparation method thereof, the high-weatherability sound insulation wood plastic wallboard comprises the following raw materials by weight: 30-40 parts of wood flour or plant fiber, 25-35 parts of a sound insulation functional filler, 35-45 parts of high density polyethylene, 2-2.5 parts of maleic anhydride grafted high density polyethylene, 1-1.5 parts of stearic acid, 3-4.5 parts of a weatherability auxiliary agent, and 1-1.5 parts of azodicarbonamide. The problems of cracking, deformation and the like caused by moisture absorption expansion are relieved by optimizing the proportion and compatibility of the wood flour and the plastic, and then the problems of weather resistance and sound insulation of the wallboard outdoors are solved by filling the porous sound absorption material.

The invention discloses a preparation method of a foamed thermal-insulation ceramic decorative plate in the technical field of building decorative materials. The method comprises the following steps: carrying out ball milling, spray drying, granulating and ageing on raw materials such as ceramic waste and kaolin; mixing and dispersing the aerogel-hydrogel gradient core-shell structure composite modified material and ceramic particles, and sieving to obtain composite powder; compounding sodium bicarbonate and azodicarbonamide with a foaming agent, mixing the foaming agent with the composite powder, and adding a surfactant and a dispersing agent to adjust the viscosity so as to prepare expandable ceramic slurry; the slurry is injected into a mold and coated with low-temperature glaze, and stepped heating sintering is conducted through a tunnel kiln and comprises the steps of preheating glue discharging, primary foaming, secondary sintering, gradient cooling and the like. The thermal insulation performance, the mechanical strength, the weather resistance and the decoration performance are synergistically improved, and the product is low in heat conductivity coefficient, high in compressive strength, excellent in ultraviolet aging resistance, firm in decoration layer combination and suitable for building outer walls and other scenes.

The invention relates to the technical field of sound insulation materials, in particular to flame-retardant epoxy resin composite diatomite sound insulation cotton and a preparation method thereof. The flame-retardant epoxy resin composite diatomite sound insulation cotton is prepared from epoxy resin, diatomite, a composite flame retardant, a coupling agent, a curing agent, a diluent, a foaming agent and a charring agent. The composite flame retardant at least comprises ammonium polyphosphate and melamine; the coupling agent is a silane coupling agent or a titanate coupling agent; the curing agent is methyl tetrahydrophthalic anhydride; the diluent is n-butyl glycidyl ether; the foaming agent is azodicarbonamide; the charring agent is pentaerythritol. By optimizing the diatomite modification process and combining physical dispersion and chemical modification means, the compatibility of the diatomite and the epoxy resin is greatly improved, the pain point of filler agglomeration in the traditional process is thoroughly solved, the porous sound insulation potential of the diatomite is fully released, and the sound absorption and sound insulation performance of the material is qualitatively improved.

The invention relates to the technical field of polymer foam materials, and discloses a light EVA foam material based on intermittent foaming heating and a preparation method thereof. The ethylene-vinyl acetate copolymer adhesive is prepared from the following raw materials: an ethylene-vinyl acetate copolymer, a maleic anhydride grafted ethylene-vinyl acetate copolymer, azodicarbonamide, basic zinc carbonate, triallyl isocyanurate, stearic acid and dicumyl peroxide. During preparation, a double-machine-position stepped heating and mechanical mode locking transfer process is adopted. The first-stage heating is initiated by dicumyl peroxide to construct a covalent cross-linked skeleton; in the second-stage foaming heating process, basic zinc carbonate is heated and decomposed, and anhydride groups are promoted to be hydrolyzed and combined with released zinc oxide in situ to form ionic crosslinking. A double-order cross-linked network formed by covalent bonds and ionic bonds can absorb bubble expansion stress and stabilize an internal microstructure. According to the invention, the occurrence rate of cell merging and cracking under the condition of low density is reduced, and the foaming material with low apparent density and small compression set rate is obtained.

This invention discloses a method for preparing a three-dimensional integrated lumbar support cushion. The raw materials of the lumbar support cushion include: ethylene-vinyl acetate copolymer, polyether-type thermoplastic polyurethane elastomer, physically foamed microspheres, azodicarbonamide, caprolactam-blocked 4,4'-diphenylmethane diisocyanate, surface-modified copper nanowires, and silver-loaded silicone composite components. The preparation process is as follows: the matrix resin and modified copper nanowires are melt-blended at high temperature, and then mixed with the foaming system, crosslinking agent, and composite components at low temperature to obtain a blended base material; the blended base material is injection molded, followed by static differential temperature field for pressure holding and curing, and finally cooled and demolded. This invention utilizes copper nanowires to construct a thermally conductive network, which, combined with the external temperature difference, forms a continuous foaming ratio and crosslinking density gradient inside, eliminating the physical phase interface of traditional multi-material splicing, significantly improving the tear resistance and fatigue life of the transition zone; and utilizes cooling phase separation to form an anti-slip and antibacterial skin layer.

The invention discloses high-heat-insulation ceramic silica gel foam, and relates to the technical field of high-temperature-resistant silica gel. The high-heat-insulation ceramic silica gel foam is prepared from the following components in parts by mass: 100 parts of methyl vinyl silicone rubber, 15 to 40 parts of ceramic silicon resin, 15 to 25 parts of a flame retardant, 3 to 15 parts of fumed silica, 0.5 to 5 parts of hydrogen-containing silicone oil, 0.1 to 2 parts of a platinum catalyst, 2 to 10 parts of an azodicarbonamide foaming agent, 1 to 8 parts of a ceramic accelerant, 0.5 to 3 parts of a heat-resistant additive and 5 to 8 parts of reinforcing filler. Compared with the prior art, the material disclosed by the invention can quickly form a compact ceramic layer at a high temperature, can more effectively block heat transfer, avoids sharp reduction of mechanical properties or structural damage of the material in a high-temperature environment, and is more excellent in high-temperature use stability.

The application relates to the technical field of cable material manufacturing, and discloses a light-weight flexible wear-resistant electrical equipment connecting cable, a sheath of the connecting cable being made of raw materials including the following: polyester type thermoplastic polyurethane elastomer, styrene-acrylonitrile copolymer, maleic anhydride grafted polyolefin elastomer, blocked isophorone diisocyanate, wear-resistant premixed solution containing a catalyst, slow-release foaming master batch and functional additives; wherein the wear-resistant premixed solution containing the catalyst contains hydroxyl-terminated polydimethylsiloxane and a bismuth octoate catalyst, the slow-release foaming master batch contains modified azodicarbonamide foaming agent and carrier resin, and the functional additives contain antioxidants and carbodiimide hydrolysis stabilizers. According to the application, the hydroxyl-terminated polydimethylsiloxane containing the catalyst and the blocked isocyanate are introduced into the polyurethane matrix in cooperation through a reaction extrusion process, the isocyanate groups are unblocked at high temperature, and the organic silicon chain segment is chemically bonded with the matrix resin.

The application relates to the technical field of high polymer materials, and discloses an antistatic shoe sole material and a preparation method thereof, which is made of ethylene-vinyl acetate copolymer, ethylene-propylene rubber, cationic POE-carbon nanotube hybrid master batch, dicumyl peroxide, azodicarbonamide and zinc oxide. The cationic POE-carbon nanotube hybrid master batch is prepared by the following steps: pre-compounding alkenyl epoxy functionalized imidazole didodecyl double cationic connecting agent with acidized carbon nanotubes, and then melt grafting the ethylene-octene copolymer thermoplastic elastomer by one-step method; and the epoxy group further reacts with the carboxyl group on the surface of the carbon nanotubes. The application can construct an electronic-ion synergistic conductive network, has low addition amount, long-term antistatic property and high resilience.

The application discloses a preparation method of a liquid crystal polymer diaphragm and the liquid crystal polymer diaphragm. The preparation method comprises the following steps: providing a soluble liquid crystal polymer, dissolving the soluble liquid crystal polymer in a first solvent, stirring and mixing to obtain a first mixed solution. Fillers are added into the first mixed solution, and dispersion treatment and defoaming treatment are performed to obtain a slurry. The fillers comprise at least one of paraffin oil, aluminum triacetylacetone powder, azodicarbonamide, calcium carbonate powder, silica powder, sodium bicarbonate powder and starch powder. A substrate is provided, the slurry is coated on the substrate, and a wet film is formed on the substrate. The wet film is subjected to drying and curing treatment, and the fillers are removed to obtain a first film body with a porous structure. The first film body is peeled off from the substrate to obtain the liquid crystal polymer diaphragm. In the preparation process of the liquid crystal polymer diaphragm, the fillers are added, the fillers are used for occupying positions in the wet film and are removed, the porous structure in the liquid crystal polymer diaphragm is increased, and the porosity is improved.

The utility model relates to the technical field of stirring devices, and discloses a mixing stirrer for azodicarbonamide, which comprises a large helical ribbon and a small helical ribbon, the head end of the large helical ribbon and the head end of the small helical ribbon are respectively and fixedly connected to one side of a rotating shaft through a first connecting pipe and a second connecting pipe; the tail ends of the large helical ribbon and the small helical ribbon are fixedly connected to the other side of the rotating shaft through a third connecting pipe and a fourth connecting pipe correspondingly, one end of the rotating shaft is rotationally connected to one end of a water inlet main pipeline in a sealed mode, and the other end of the water inlet main pipeline is fixedly connected with the output end of a circulating water cooling mechanism; the other end of the rotating shaft penetrates out of the outer side of the box body and is rotationally connected with one end of a water outlet main pipeline in a sealed mode, the other end of the water outlet main pipeline is fixedly connected with the input end of a circulating water cooling mechanism, a U-shaped water tank shell is fixedly connected to the bottom of the box body, and a water inlet branch pipeline is fixedly connected to one side of the top end of the U-shaped water tank shell; the diagonal sides of the top end of the U-shaped water tank shell are fixedly connected with water outlet branch pipelines, and the material cooling function is achieved through a water circulation mechanism.

The application belongs to the technical field of polyvinyl chloride foam material preparation, and particularly relates to a polyvinyl chloride foam material for offshore operation and a preparation method thereof. The polyvinyl chloride foam material for offshore operation comprises polyvinyl chloride resin as a base resin, silane-modified aluminum borate nanometer whisker, 1-(9,10-epoxy octadecanoyloxy)-3-(2-methylprop-2-enoyloxy)propan-2-ol and oleic acid-modified Mg-Al-Zn ternary intercalation hydrotalcite as modified raw materials, 4,4'-diphenyl methane diisocyanate and 4,4'-dicyclohexyl methane diisocyanate are compounded to construct a soft and hard synergistic crosslinking network, azodicarbonamide, benzene-1,3-disulfonyl hydrazide and zinc oxide are compounded to form a foaming agent to realize gradient nucleation foaming, and a heat stabilizer, a light stabilizer and an antioxidant are further added. As a result, the synergistic effect between the raw materials enables the polyvinyl chloride foam material to have excellent salt mist resistance and impact resistance.

The invention discloses a mechanical fastening belt and a manufacturing method thereof, and relates to the technical field of mechanical fastening belts. The hook surface is compounded and fixed on the surface of one side of one end in the length direction of the base film through thermal forming; the base film is a modified base film added with a composite foaming system, and the composite foaming system is formed by compounding a physical foaming agent and a chemical foaming agent; the physical foaming agent is hollow glass beads, and the chemical foaming agent is azodicarbonamide. A composite foaming system formed by compounding hollow glass beads and azodicarbonamide is adopted in the base film, and the hook surface is compounded and fixed on the surface of one side of one end of the length direction of the base film through thermal forming, so that the uniformity of an internal bubble structure of the base film is improved; the problems that a traditional mechanical fastening belt is too high in gram weight, high in material cost and poor in use flexibility due to a single foaming system of a base film, and the compounding firmness of a hook face and the base film is insufficient can be solved.

The invention discloses a preparation method of a liquid crystal polymer film and the liquid crystal polymer film, and provides a soluble liquid crystal polymer, and the soluble liquid crystal polymer is dissolved in a first solvent to obtain a first mixed solution; adding a foaming agent, a dispersing agent and a foaming promoter into the first mixed solution, and carrying out dispersion treatment and defoaming treatment to obtain precursor slurry; the foaming agent is prepared from at least one of azodicarbonamide, p, p '-oxybisbenzenesulfonyl hydrazide and N, N'-dinitroso pentamethylene tetramine. Providing a substrate, coating the precursor slurry on the substrate, and forming a wet film on the substrate; and carrying out heat treatment on the wet film to obtain a first film body. And separating the first film body from the substrate to obtain the liquid crystal polymer film. The foaming agent, the dispersing agent and the foaming promoter have a synergistic effect to jointly construct a stable and efficient foaming system. The prepared liquid crystal polymer film has low dielectric constant and dielectric loss, and also has good mechanical properties.

The invention relates to a preparation method of an anti-aging high-resilience elastic material for a foaming process, and belongs to the technical field of foaming elastic materials. The preparation method comprises the following steps: putting an ethylene-vinyl acetate copolymer, a thermoplastic polyurethane elastomer, dioctyl phthalate, an anti-aging agent, a lubricant, a triazole ferrocene synergistic aid, an azodicarbonamide foaming agent and a dicumyl peroxide cross-linking agent into an internal mixer for internal mixing, and performing open mixing in an open mill to obtain a rubber sheet; putting the rubber sheet into a mold, putting the mold into a press vulcanizer, and carrying out vulcanization foaming to obtain an elastic material; the triazole ferrocene synergistic auxiliary agent is prepared from 3-vinyl-1, 2, 4-triazole, 1, 1-bis (dimethylsilyl) iron, anhydrous toluene and a chloroplatinic acid toluene solution, and the triazole ferrocene synergistic auxiliary agent is prepared from the following raw materials: 1, 1-bis (dimethylsilyl) iron, anhydrous toluene and a chloroplatinic acid toluene solution. The elastic material prepared by the invention has the advantages of excellent aging resistance, high compression resilience rate and good durability, and can maintain stable resilience performance in a long-term use process.

The application discloses an anti-aging and yellowing-resistant foamed polyester material and a preparation method thereof, and relates to the technical field of polyester materials. The anti-aging and yellowing-resistant foamed polyester material is prepared from the following raw material components in proportion by weight: 3-5 parts of anti-ultraviolet SEBS, 3.6-7 parts of triethylamine, 4-6 parts of a flame-retardant and wear-resistant filler, 100 parts of TPEE, 0.9-1.1 parts of a polymer wax, and 0.6-0.8 parts of a foaming agent. The anti-ultraviolet SEBS is obtained by copolymerization grafting of an unsaturated benzophenone ultraviolet absorber, SEBS and maleic anhydride. The flame-retardant and wear-resistant filler is obtained by mixing and reacting carboxylated nano silicon dioxide, pentaerythritol and phosphorus oxychloride. The polymer wax is EVA wax. The foaming agent is azodicarbonamide. The anti-aging and yellowing-resistant foamed polyester material has good mechanical properties, anti-aging performance, flame-retardant performance and compression resistance.

The invention discloses an anti-fouling PCR ABS laser etching material and a preparation method thereof, and relates to the technical field of PCR ABS material modification and laser etching function integration. The anti-pollution PCR ABS laser etching material has the advantages that the anti-pollution PCR ABS The invention discloses a PCR (Polymerase Chain Reaction) ABS (Acrylonitrile Butadiene Styrene) resin composition, which is prepared from the following raw materials in parts by weight: 50 to 90 parts of PCR ABS resin, 6 to 10 parts of modified organic silicon micro powder, 2 to 15 parts of modified ultra-high molecular weight polyethylene powder, 2 to 8 parts of azodicarbonamide, 2 to 6 parts of methyl methacrylate-butyl acrylate copolymer, 1 to 3 parts of antioxidant 1010, 0.5 to 2.5 parts of glass beads, 0.5 to 2 parts of anatase titanium dioxide, 0.2 to 1 part of silane coupling agent KH-550 and 0.5 to 1.0 part of calcium-zinc stabilizer. 0.1 to 0.5 part of carbon black, 0.05 to 0.1 part of polyethylene wax and 0.4 to 1 part of absolute ethyl alcohol. Aiming at core pain points of laser engraved keys of a computer keyboard, through optimization of synthetic resin, the problems that characters made of common materials are polluted by hand sweat, alcohol and the like and are blurred within 1-3 months are effectively solved; and the resin is adaptive to most keyboard key basic resins such as ABS, PC and the like, and the character definition and the service life of the product are both considered.

The invention relates to the field of composite material mold pressing, in particular to a lightweight sheet and a preparation method thereof. According to the invention, an unconventional curing system azodicarbonamide and an azodiisobutyronitrile initiator are used for initiating polymerization, gas is locked through resin curing and crosslinking to form pores so as to achieve the purpose of light weight, and the gas is harmless nitrogen which accords with the idea of environmental protection; according to the invention, a traditional peroxide curing agent is abandoned, azodicarbonamide and azodiisobutyronitrile are directly utilized to produce active free radicals while being thermally decomposed to release gas, and styrene and unsaturated polyester resin are initiated to be subjected to cross-linking curing, so that gas release and curing are synchronously carried out; and the balance between gas release and resin cross-linking curing can be controlled only through the temperature.

The present invention relates to a material comprising actinide oxide-based porous microspheres obtained by an internal gelation process. The invention also relates to the use of this material in the manufacture of nuclear fuels, in particular as a sintering additive in the manufacture of nuclear fuel pellets of the MOX (mixed oxide) type, more particularly as a pore former in place of the pore former conventionally used in said manufacture, i.e. Azodicarbonamide.

The application provides a self-igniting fire extinguishing agent and application thereof, and has the characteristics that the self-igniting fire extinguishing agent comprises the following raw material components in parts by weight: 50-60 parts of potassium nitrate, 5-10 parts of strontium nitrate, 5-10 parts of 5-amino tetrazole, 5-10 parts of azodicarbonamide, 5-10 parts of dicyandiamide, 5-10 parts of melamine, 5-10 parts of phenolic resin, 5-10 parts of shellac resin, 5-10 parts of potassium bicarbonate, 1-5 parts of nitrocellulose and 1-10 parts of vermiculite powder. The self-igniting fire extinguishing agent is applied to fire extinguishing products such as fire extinguishing ropes and fire extinguishing sheets, and has the characteristics of large fire extinguishing range, fast ignition, low-temperature ignition (about 180 DEG C), complete reaction, low turbidity of fire extinguishing gas, low cost, passive temperature-sensing multiple fire extinguishing and the like.

The invention discloses a composite cleaning agent for a screw of an injection molding machine as well as a preparation method and application of the composite cleaning agent, and relates to the field of cleaning agents. The water-based adhesive comprises the following components: 15-25% of azodicarbonamide, 8-12% of a water-soluble azo initiator, 8-12% of a fluorinated surfactant, 3-7% of triethanolamine oleate, 3-7% of diphenylmethane diisocyanate, 12-18% of sodium tartrate, 12-18% of sodium carbonate and the balance of alkaline ionized water. According to the composite injection molding machine screw cleaning agent and the preparation method and application thereof, stubborn residues such as pigment and carbon black can be rapidly removed through multiple synergistic effects, and the cleaning time can be shortened to 5-20 minutes; the consumption of resin for cleaning is greatly reduced, and tests show that the resin cleaning cost can be saved by up to 85% and the time cost can be saved by 80%.

The present invention relates to a material comprising porous microspheres based on actinide oxides, obtained by an internal gelation method. The present invention also relates to the use of this material as a sintering additive in the production of nuclear fuel, particularly in the production of MOX (mixed oxide) type nuclear fuel pellets, and more specifically as a pore-forming agent to replace conventionally used pore-forming agents in said production, namely azodicarbonamides.

This invention discloses a high-permeability, low-absorption-resistance silicone material and its preparation method. The silicone material comprises the following raw materials in parts by weight: 100-120 parts of diene polysiloxane, 30-35 parts of modifying additives, 10-15 parts of modified silica, 0.1-0.5 parts of caster catalyst, 0.02-0.05 parts of ethynylcyclohexanol, 5-10 parts of azodicarbonamide, and 0.5-0.8 parts of zinc oxide. During the heating and heat preservation process, the diene polysiloxane and the modifying additives react to form a silicone network. At the same time, the furan groups on the modifying additives and the maleimide groups on the modified silica form covalent bonds, forming a double network structure inside, which can effectively transfer stress and prevent crack propagation, thereby simultaneously improving tensile strength, tear strength, and toughness.

This invention relates to the field of adhesive materials technology, specifically disclosing a polyvinyl chloride (PVC) foam tape and its preparation method. The raw materials for the PVC foam tape include PVC resin, environmentally friendly plasticizer, composite foaming agent, nano-reinforcing agent, low-temperature toughening agent, halogen-free flame retardant, calcium-zinc composite stabilizer, and adhesive. The nano-reinforcing agent is obtained through stearic acid activation, silica coating, and modification with KH-570 coupling agent. The composite foaming agent is prepared by microencapsulating azodicarbonamide and compounding it with 4,4'-oxobisbenzenesulfonyl hydrazine. The preparation method employs a segmented mixing process, first mixing PVC resin and additives at high temperature, then adding a heat-sensitive component after cooling, followed by twin-screw extrusion plasticization, three-stage gradient foaming, corona treatment of the surface, and finally coating with adhesive. This invention achieves low plasticizer migration, controllable cell structure, and excellent batch stability, making it suitable for applications in building sealing, automotive assembly, and electronics.

The invention discloses a bacteriostatic and warm-keeping fabric fiber and a preparation method thereof, belongs to the technical field of fabric fiber processing, and is used for solving the technical problem that the mechanical strength, bacteriostatic performance and warm-keeping performance of fabric fibers in the prior art need to be further improved. Terephthalic acid, ethylene glycol, PEG-400, 3, 5-bis (2-hydroxyethoxycarbonyl) sodium benzenesulfonate and a catalyst are mixed and stirred, gel-based particles containing quaternary ammonium salt, silicon-titanium coupled and activated epoxy graphene and azodicarbonamide are introduced into a composite polyester matrix, a large number of closed and semi-closed air cavities are constructed in hollow fibers, and the hollow fibers are uniformly dispersed in the hollow fibers. The mechanical property and the antibacterial property of the fabric fiber material are effectively improved, and the heat retention property and the far infrared emission property of the fabric fiber are also improved, so that the fabric has excellent heat storage feedback capability and wearing comfort.

The application discloses a preparation method of high-rebound shock-absorbing foamed material and foamed shoe material. The method comprises the following steps: preparing modified chitosan oligosaccharide, preparing composite titanium dioxide, preparing microcapsule particles, and preparing foamed material. In the preparation of the foamed material, a first mixture is formed by mixing a thermoplastic elastomer, a ternary ethylene-propylene rubber and the modified chitosan oligosaccharide, then microcapsule particles are added to form a second mixture, and then azodicarbonamide foaming agent is added, and the mixture is opened, granulated and molded to form the foamed material. The obtained foamed shoe material has good mechanical strength, compression recovery, rebound and dynamic damping comprehensive performance.

The application relates to the technical field of high-molecular foaming materials, in particular to a low-hardness high-fatigue-resistance EVA composite foaming material and a preparation method thereof, which comprises the following components in parts by weight: ethylene-vinyl acetate polymer 35-45 parts, thermoplastic polyurethane elastomer 17-23 parts, butadiene and styrene copolymer 13-17 parts, zinc oxide 3-5 parts, lubricant 7-8 parts, azodicarbonamide 11-12 parts, filler 4-6 parts, carboxylated nano-silicon dioxide 2-5 parts, soluble zinc salt 0.5-2 parts and dicumyl peroxide 0.5-1.5 parts. 2+ The application constructs a Zn-carboxyl coordination crosslinking network, so that the dynamic fatigue resistance of the material is revolutionarily improved; the moderate dynamic reversibility of the coordination bond can efficiently dissipate energy and quickly recover in long-term compression cycles, and fundamentally solves the problem that the low-hardness foaming material is prone to fatigue collapse.

The invention provides a high-branching-degree polyethylene foam material for a new energy battery and a preparation method of the high-branching-degree polyethylene foam material, and belongs to the field of high-branching-degree polyolefin. The foam material is prepared from the following raw materials in parts by weight: 60 to 80 parts of high-branching polyethylene, 5 to 12 parts of hydrogenated styrene-butadiene-styrene block copolymer, 3 to 8 parts of maleic anhydride grafted polyethylene, 5 to 14 parts of linear low-density polyethylene, 2 to 5 parts of ethylene-acrylic acid copolymer, 3 to 9 parts of hydroxylated boron nitride nanosheet and 3 to 8 parts of bismuth-based high-temperature phase change alloy. The foaming agent is prepared from the following components in parts by weight: 1 to 5 parts of epoxy cyclohexyl polyhedral oligomeric silsesquioxane, 0.5 to 2 parts of trimethylolpropane, 1 to 3 parts of polyethylene glycol and 1 to 3 parts of azodicarbonamide foaming agent. Through precise raw material component matching and function cooperation, efficient mechanical buffering, precise heat management and long-term structure stability of the foam material are synchronously achieved from three dimensions of matrix supporting, function strengthening and interface stability.

The application discloses a low-temperature water-sulfur-poisoning-resistant vanadium-based catalyst and a preparation method and application thereof, and the catalyst is prepared by adopting a template-hydrothermal method and takes V2O5 as an active component, a compound of CeO2 and Ho2O3 as a cocatalyst and a SO2 capturing agent, a hydrophobic submicron flake hydrotalcite as a carrier, a submicron flake CaSO4 as a template agent and azodicarbonamide as a morphology control agent. The mass percentage of the active component is 3% to 5% based on the mass of the hydrophobic submicron flake hydrotalcite carrier, the mass percentage of the cocatalyst is 5% to 10%, and the mass ratio of CeO2 to Ho2O3 in the cocatalyst is 1:0.5 to 1. The catalyst is environment-friendly, can catalytically reduce NO in flue gas into N2 at low temperature, and has excellent water-sulfur-poisoning-resistant performance.

This invention belongs to the field of polymer foaming materials technology, specifically relating to a pressure-resistant and heat-insulating cushioning cotton and its preparation method. The invention uses low-density polyethylene (LDPE) as the main component, providing good melt ductility for foaming and facilitating cell growth and molding. High-density polyethylene (HDPE) is added as a reinforcing phase, bearing and dispersing compressive stress within the LPE. Toughening agents absorb crack energy in the cushioning cotton through an anchoring effect, improving the cotton's strength and impact resistance. Azodicarbonamide is intercalated between montmorillonite layers through ball milling, and then encapsulated with epoxy resin to obtain a composite foaming agent. Montmorillonite acts as a heterogeneous nucleation site, refining the cell structure. Staged heating controls the gas production rate, avoiding the problems of bursting and uneven cell size caused by concentrated gas production in a single event. The cushioning cotton prepared by this invention exhibits excellent heat and pressure resistance, solving the problem of softening and shrinkage leading to cushioning failure in areas near heat sources.

The invention belongs to the technical field of polymer processing, and particularly relates to a preparation method of a high-barrier polylactic acid foam material, which comprises the following steps: S1, melting and premixing a foaming agent azodicarbonamide and polypropylene carbonate, and selectively enriching azodicarbonamide in a polypropylene carbonate phase to obtain a premix; s2, carrying out melt blending on the premix obtained in S1 and polylactic acid to obtain a polylactic acid / polypropylene carbonate / azodicarbonamide composite material; s3, performing foaming treatment on the composite material to decompose azodicarbonamide in a polypropylene carbonate phase so as to induce generation of foam holes in the polypropylene carbonate and compress a continuous path of a polylactic acid phase, thereby obtaining the high-barrier polylactic acid foaming material. By controlling the distribution of azodicarbonamide, the structural integrity and continuity degree of a polypropylene carbonate phase are improved, so that the overall barrier property of the material is obviously improved compared with that of an unfoamed or non-selective foamed material, and the oxygen and water vapor transmittance is reduced.