50 results about "Oleic acid amide" patented technology

The invention discloses a lubricating grease composition I and a lubricating grease composition II, wherein the lubricating grease composition I is used as a raw material of the lubricating grease composition II. The lubricating grease composition I comprises 60-90 parts of base oil, 5-20 parts of a fatty acid composition, 2-5 parts of lithium hydroxide, 2-6 parts of modified nano boron nitride and 5-15 parts of an additive; wherein the viscosity of the base oil at 40 DEG C is 30-60 mm < 2 > / s, and the base oil is prepared by compounding and mixing 60%-90% w / w of poly-alpha-olefin synthetic oil (PAO) and the balance of synthetic ester (POE) belonging to V-type synthetic oil; the fatty acid composition is prepared from 12-hydroxystearic acid and unsubstituted C14-C20 saturated long-chain fatty acid, wherein the mass of the 12-hydroxystearic acid is 1 to 10 times that of the unsubstituted C14-C20 saturated long-chain fatty acid; the modified nano boron nitride is oleamide modified nano boron nitride; the additive is selected from at least one of an antioxidant, an anti-rust agent and an extrusion anti-wear agent. The invention also discloses application of the lubricating grease composition II as lubricating oil in lubrication of axle box bearings of high-speed railway trains with the speed of not less than 400km / h.

The application belongs to the field of paint, and particularly discloses an oil-proof paint, a preparation method and application thereof. The application adds starch, beta-cyclodextrin and oleic acid amide into the oil-proof paint system, so that the barrier property of the film layer of the oil-proof paint is improved, and the prepared paper-based oil-proof coating has excellent oil-proof effect.

The invention belongs to the technical field of defoaming agents, and particularly relates to a degradable defoaming agent as well as a preparation method and application thereof. The degradable vegetable oil acid amide in the defoaming agent is easily dispersed in liquid, so that the surface tension of the liquid is reduced; the polyol fatty acid ester can form insoluble particles for defoaming; the nano-emulsion stabilizing aid physically and efficiently defoams by adsorbing gas, and has a thickening effect; fatty alcohol can be quickly diffused to a foam interface, so that the surface tension is reduced, and a quick defoaming effect is achieved. The prepared degradable defoaming agent is free of silicone oil residues, biodegradable in bio-based component and environmentally friendly, the fatty alcohol and the degradable vegetable oleic acid amide can conduct defoaming in time, the nano emulsion stabilizing additive and the fatty acid ester can inhibit the foam regeneration effect, the lauric acid diethanol amine and the Tween 80 can improve the compatibility and dispersity of all the components of the defoaming agent, and the defoaming effect is good. Through the synergistic effect of all the components, the foam inhibitor has excellent degradability, dispersibility and foam inhibition when being applied to paint and ink.

The invention discloses a pH-responsive alkaline clean fracturing fluid as well as a preparation method and application thereof, and belongs to the technical field of oil and gas field fracturing. The cleaning agent comprises the following components in parts by mass: 1-5 parts of an anionic surfactant, 1-5 parts of a zwitterionic surfactant, 0.2 part of a pH regulator and 100 parts of deionized water, wherein the anionic surfactant is sodium oleate or sodium stearate; the zwitterionic surfactant is erucyl amide propyl betaine or oleamide propyl betaine; and the surfactant is a surfactant. The pH regulator is any one of sodium hydroxide, potassium hydroxide and sodium bicarbonate. The fracturing fluid is a clean fracturing fluid system based on pH response type micelle dynamic reconstruction, and through the synergistic effect of a specific surfactant and a pH response mechanism, accurate and rapid regulation and control of viscosity, zero residue damage and construction process simplification are achieved; the technical problems that an existing surfactant fracturing fluid is complex in compounding process, cannot be recycled after gel breaking, is slow in gel breaking response and narrow in application range are solved.

The invention relates to the technical field of household fabrics, and particularly discloses a polypropylene elastic non-woven fabric and a preparation method thereof. The polypropylene elastic non-woven fabric is mainly prepared from the following raw materials in parts by weight: 100 parts of polypropylene, 10-20 parts of an ethylene-octylene copolymer, 2-4 parts of maleic anhydride grafted polypropylene, 1-3 parts of modified nano silicon dioxide and 0.5-2 parts of an antioxidant. The modified nano silicon dioxide is obtained by treating nano silicon dioxide with 3-trimethoxy silane propyl acrylate, oleamide and 2-(4-vinyl phenyl) methyl acetate. Through mutual cooperation of the raw materials, the non-woven fabric has the characteristics of high breaking strength, high elongation at break and high wear resistance, shows excellent comprehensive performance, and can meet the requirements of the non-woven fabric as spring wrapping cloth.

The application discloses a manufacturing process of a stamping processing protective film, which comprises the following steps: step one, stirring and mixing zinc oxide, polysebacic acid-decanediol diol and dicyclohexyl carbodiimide at 50-60 DEG C to obtain material A; step two, putting 100 parts of low-density polyethylene with a melt index of 0.5-5 g / 10 min, metallocene linear low-density polyethylene with a melt index of 1.8-2 g / 10 min, oleic acid amide, zinc stearate, stearate and an antioxidant into a mixer, uniformly mixing and then extruding and granulating in a double-screw extruder to obtain material B; step three, putting material A, material B and terpolymer polypropylene into a banbury mixer, discharging after banburying for 10-30 min to obtain a master batch; and step four, blow molding the master batch to obtain a polyethylene base material layer. The protective film improves the elongation at break of the film and also improves the puncture resistance of the protective film.

The invention provides a preparation method of a multifunctional plant growth promoter, which comprises the following steps: S1, during use, preparing raw materials, mixing 0.5-5% by weight of oleamide and 0.1-0.5% by weight of erucyl amide, putting the mixture and 0.1-0.5% by weight of erucyl amide into a reaction kettle, and stirring; s2, after stirring, 0.4-2% by weight of tall oil is put into the reaction kettle to be stirred and continuously mixed; step S3, after mixing, adding 0.5 to 2.1 percent by weight of oleic acid; s4, adding a mixture of 1-5% by weight of lauryl sodium sulfate and 0.1-3% by weight of tridecanol polyether into the reaction kettle, and continuously stirring; s5, continuously adding a mixture of 0.3-1.5% by weight of sodium gluconate and 0.5-3% by weight of xylitol into the reaction kettle, and testing the temperature of the mixed liquid in the reaction kettle; s6, when the temperature of the liquid in the reaction kettle is reduced to 32-37 DEG C, testing the pH value in the reaction kettle; according to the invention, the absorption performance of plant cells can be improved, and crops can be assisted to quickly absorb sunlight, various nutritional ingredients, drug performance and water retention performance.

The application provides an oleic acid amide compound, a preparation method and a method for improving propellant performance, and the method for improving propellant performance comprises the following steps: adding the oleic acid amide compound into a solid propellant with a solid content greater than or equal to 90% as an additive for reducing the viscosity of a solid propellant slurry and improving the flow leveling property of the solid propellant slurry. The oleic acid amide compound of the application can significantly improve the wetting state of solid particles and a binder system of the propellant, so that the solid particles are easily dispersed, the structural strength hindering the flow in the slurry is reduced, the yield value and the viscosity of the slurry are reduced, and the flow leveling index of the slurry is improved. The application effect of the oleic acid amide compound in the solid propellant with a solid content greater than or equal to 90% is good.

The present invention belongs to the technical field of polyurethane synthetic leather, and specifically relates to a reactive feel agent, a preparation method thereof, and an application. The reactive feel agent provided by the present invention comprises a dihydroxy-terminated silicone oil, oleic acid amide, and erucic acid amide; the dihydroxy-terminated silicone oil is obtained by a condensation reaction of a hydrogen-terminated silicone oil and an allyl alcohol polyether; the mass percentage of the erucic acid amide in the dihydroxy-terminated silicone oil is ≤10%; the mass percentage of the oleic acid amide in the dihydroxy-terminated silicone oil is ≤10%. The reactive feel agent provided by the present invention utilizes the dihydroxy-terminated silicone oil to introduce a polysiloxane chain segment into the polyurethane molecular structure through a chemical bond. By compounding a small amount of oleic acid amide and erucic acid amide, while not affecting the reaction activity of the dihydroxy-terminated silicone oil, an ideal comprehensive feel can be provided, that is, a touch effect similar to that of baby skin with elasticity, fullness, and softness.

The invention discloses a PET base film and a PET base film plate preparation method, and relates to the technical field of plates, the PET base film comprises PET resin, oleamide, silicon dioxide, an antioxidant and a flake mica sheet, the antioxidant is formed by mixing a hindered phenol antioxidant and a phosphite ester antioxidant, and the aspect ratio of the flake mica sheet is 80-150; the PET film is adopted to replace a traditional LVT plate bottom film, the characteristic that the intermolecular structure of the PET material is tighter is fully utilized, the barrier property of the material is remarkably improved, and therefore migration and precipitation of a plasticizer are effectively inhibited.

The application discloses an environment-friendly anti-freezing reinforcing agent for fly ash autoclaved aerated concrete and a preparation method thereof. The anti-freezing reinforcing agent comprises the following components in percentage by weight: 10-20% of oleic acid amide, 5-10% of triethanolamine, 5-10% of lignosulfonate, and the rest is water. The anti-freezing reinforcing agent for fly ash autoclaved aerated concrete is obtained by compounding oleic acid amide, triethanolamine and lignosulfonate. The anti-freezing reinforcing agent is compatible with the raw material system and autoclaving process of the fly ash autoclaved aerated concrete. Through multiple synergistic effects, the anti-freezing and thawing durability of the fly ash autoclaved aerated concrete is significantly improved, meanwhile, the dry density, compressive strength and other basic performances of the fly ash autoclaved aerated concrete are not negatively affected, and the anti-freezing reinforcing agent is environment-friendly.

The invention relates to low-moisture active isocyanate and a preparation method thereof, and belongs to the technical field of isocyanate synthesis. The preparation method comprises the following steps: firstly, blocking isocyanate ends of isocyanate propyl triethoxy silane and 3-isocyanate propyl trimethoxy silane by using a pyrazole blocking agent, and then converting the blocked isocyanate ends of the isocyanate propyl triethoxy silane and the 3-isocyanate propyl trimethoxy silane with gamma-methacryloyloxy propyl triisopropoxy silane to form a multi-branched diisocyanate-terminated intermediate; high steric hindrance of the multi-branched chain significantly reduces the water vapor transmittance, the sealing agent can prevent the isocyanate end from reacting with water vapor during storage and processing, and the active isocyanate end released by heating participates in crosslinking during subsequent application; the low-moisture active isocyanate is obtained by blending, compounding and modifying with oleamide and a photoinitiator, and is subjected to UV curing in subsequent application, so that the surface energy is further reduced, and the contact with water is reduced. The isocyanate prepared by the method disclosed by the invention has the effect of low moisture.

The invention provides a chloroprene rubber material and a preparation method thereof, and relates to the technical field of rubber materials. The chloroprene rubber material comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 70-80 parts of carbon black, 25-30 parts of a plasticizer, 4-6 parts of zinc oxide, 2-3 parts of magnesium oxide, 2-3 parts of hydrotalcite, 0.3-0.6 part of stearic acid, 1-3 parts of an anti-aging agent, 2-3 parts of oleamide, 0.5-1.5 parts of a vulcanization accelerator and 0.3-0.6 part of microcrystalline wax. The chloroprene rubber material provided by the invention has the excellent characteristics of low temperature resistance, low pressure change and tear resistance.

The present invention relates to a self-lubricating ethylene propylene diene monomer rubber and its preparation method and application. The components and their mass parts are as follows: ethylene propylene diene monomer rubber: 100 parts, fast extrusion carbon black: 50 - 80 parts, paraffin oil: 5 - 40 parts, ester plasticizer: 2 - 5 parts, oleic acid amide: 12 - 20 parts, zinc oxide: 4 - 6 parts, stearic acid: 1 - 3 parts, 2-mercaptobenzothiazole: 0.5 - 2 parts, zinc dibutyldithiocarbamate: 0.5 - 2 parts, tetramethylthiuram disulfide: 0.5 - 1 part, tetramethylthiuram tetrasulfide: 0.5 - 1 part, sulfur: 0.5 - 2 parts. The product of the present invention will exhibit a self-lubricating effect in a very short time. In a dynamic use environment, even when the lubricant is continuously consumed, it can still quickly, long-term, and continuously precipitate the lubricant to ensure a continuously low friction resistance effect in the dynamic environment.

The invention discloses a rhamnolipid composite oil displacement agent as well as a preparation method and application thereof, and relates to the technical field of oil field oil extraction agents. The main active component of the composite oil displacement agent is rhamnolipid produced by fermentation of pseudomonas aeruginosa CCTCC NO. M 2025023, and the composite oil displacement agent further comprises coconut oil fatty acid diacetamide, sodium dodecyl benzene sulfonate, sodium cocoyl glycinate, coco-dimethyl betaine and oleamide propyl betaine. The invention also provides a preparation method of the rhamnolipid composite oil-displacing agent, which comprises the following steps: (1) fermenting strains to produce rhamnolipid, (2) preparing rhamnolipid fermentation supernate, or extracting a rhamnolipid product, and (3) preparing the rhamnolipid composite oil-displacing agent. And (3) adding five additives into the rhamnolipid fermentation supernatant, or adding the rhamnolipid extract and the five additives into water to prepare the rhamnolipid composite oil-displacing agent. The rhamnolipid composite oil-displacing agent disclosed by the invention is simple and convenient to prepare, economical, environment-friendly and high in oil-displacing activity, and can be applied to improving the oil recovery ratio.

The invention discloses a high-viscosity and high-elasticity modified asphalt and an asphalt composition, which belong to the field of asphalt and solve the technical problem that the existing asphalt materials lack high-viscosity and high-elasticity modified asphalt suitable for diverse climates. The high-viscosity and high-elasticity modified asphalt suitable for diverse climates is prepared from the following raw materials in parts by mass: 100 parts of road petroleum asphalt, 2.5-4 parts of epoxidized modified styrene-butadiene-styrene block copolymer, 5-10 parts of hyperbranched polyester modified styrene-isoprene-styrene block copolymer, 5-10 parts of tackifying resin, 1-2 parts of rubber powder, 1-2 parts of oleic acid amide, 2-3 parts of bagasse fiber, and 2-10 parts of other functional additives. The modified asphalt has the advantages of high viscosity and high elasticity and is suitable for diverse climates.

The invention discloses a skin-sourced streptococcus infantis CCSM002 capable of improving skin health and a metagen of the streptococcus infantis CCSM002, and belongs to the field of microbial technologies and medicines. The streptococcus infantis CCSM002 provided by the invention has the capability of generating oleamide, D-erythrodisphingosine and (2-oxo-2, 3-dihydro-1H-indole-3-yl)-acetic acid, and the strain has a good effect of repairing a barrier function in the aspect of external use and a good application prospect, specifically, the activity of damaged HaCaT cells is improved in vitro, the activity of the damaged HaCaT cells is improved, the activity of the damaged HaCaT cells is improved, and the activity of the damaged HaCaT cells is improved. The expression of tissue kininolase is reduced, and the gene level expression of FLG, IVL, AQP3, ZO-1 and Occludin can be improved at the same time in the aspect of improving functional protein and structural protein after damage. Therefore, the streptococcus infantis CCSM002 has a huge application prospect in preparation of external daily chemical products or medicines for repairing the skin barrier.

The present invention belongs to the technical field of defoaming agents, and specifically relates to a degradable defoaming agent, a preparation method thereof, and an application thereof. The degradable vegetable oleic acid amide in the defoaming agent of the present invention is easily dispersed in a liquid, reducing the surface tension of the liquid; the polyol fatty acid ester can form insoluble particles for defoaming; the nanoemulsion stabilizing agent physically and efficiently defoams by adsorbing gas, and has a thickening effect; the fatty alcohol can quickly diffuse to the foam interface, reducing the surface tension to achieve a rapid defoaming effect. The degradable defoaming agent prepared by the present invention has no silicone oil residue, the bio-based components are degradable, and are environmentally friendly. The fatty alcohol and the degradable vegetable oleic acid amide can instantly defoam, the nanoemulsion stabilizing agent and the fatty acid ester can inhibit the foam regeneration effect, and the diethanolamine laurate and Tween 80 can improve the compatibility and dispersibility of the various components of the defoaming agent. Through the synergistic effect of the various components, the defoaming agent has excellent degradability, dispersibility, and anti-foaming properties when applied to coating inks.

The application discloses an ABS composite material and a preparation method and application thereof, and relates to the technical field of engineering plastics.The raw material of the ABS composite material comprises the following components in parts by weight: SAN resin 44-67 parts; high glue powder 13-26 parts; nylon resin 9-32 parts; surface modifier 0.8-7 parts; the high glue powder is ABS high glue powder; the surface modifier comprises oleic acid amide and erucic acid amide, and the mass ratio of the oleic acid amide to the erucic acid amide is (1-5):(1-5). The ABS composite material has excellent softness, and also has excellent scratch resistance and stain resistance.

The application relates to the packaging box processing field and particularly discloses a packaging box printing process. The packaging box printing process comprises the following steps: S1: a pretreatment liquid is brushed on the surface of a packaging box to be printed for 10-15 minutes and then heated and dried, wherein the pretreatment liquid is prepared by mixing the following raw materials in parts by weight: 80-100 parts of water and 5-7 parts of water-soluble chitosan; S2: 50-70 parts of a connecting agent, 8-12 parts of pigment, 40-55 parts of water, 1-3 parts of polyether modified silicon defoaming agent, 1-3 parts of oleic acid amide and 10-15 parts of nano titanium dioxide are uniformly mixed to prepare water-based ink; and S3: the water-based ink is sprayed on a paper packaging box to be printed and dried. In addition, the printing process has the advantages that the water-based ink printed has good adhesion.

The invention relates to the technical field of PE (polyethylene) heat-sealing films, in particular to a preparation method of a high-barrier PE heat-sealing film which comprises the following components in parts by mass: 100 parts of low-density polyethylene (LDPE); 5 to 15 parts of hydroxyl-terminated polybutadiene (HTPB); 40 to 60 parts of polyolefin elastomer (POE); and 0.002 parts of an anti-blocking agent oleamide. In the scheme, hydroxyl-terminated polybutadiene (HTPB) and polyolefin elastomer (POE) are compounded for use. Polar hydroxyl in a molecular chain of the HTPB can form hydrogen-bond interaction with oxygen and water molecules, the permeation path of the HTPB is remarkably prolonged, and by matching with uniform dispersion of the HTPB in an LDPE matrix, the oxygen permeability of the film is reduced to 100-150cm < 3 > / m < 2 >. 24h. 0.1 MPa, and the water vapor permeability is reduced to 1.5-2g / m < 2 >. 24h. Meanwhile, by introducing POE and utilizing the excellent elasticity of POE and the good compatibility with PE, the flexibility of the modified film is effectively improved, the tensile elongation at break reaches 350%-450%, and the contradiction that the brittleness is increased when the barrier property is improved in traditional barrier modification is solved.

The invention relates to the technical field of macromolecules, and discloses a high wear-resistant modified polypropylene material and a preparation process thereof, the material comprises the following raw materials by weight: 40-50 parts of polypropylene random copolymer, 10-20 parts of a flexibilizer, 10-20 parts of an elastomer, 10-20 parts of a wear-resistant filler, 10-20 parts of a reinforcing agent, 10-20 parts of a compatilizer, 10-20 parts of a surface slipping agent and 10-20 parts of an auxiliary agent. 10 to 14 parts of low density polyethylene; 6-10 parts of ethylene propylene diene monomer; 7-9 parts of nanoscale silicon carbide; 10 to 13 parts of an ethylene-octylene polymer; 5-8 parts of a polyurethane elastomer; 1.3 to 1.8 parts of bronze powder; 4-5 parts of nanoscale zinc oxide; 2-4 parts of an antioxidant; 0.8 to 1.1 parts of oleamide; according to the present invention, the polypropylene random copolymer is adopted to replace the conventional polypropylene, the low density polyethylene according to the formula ratio is added as the base resin, the bronze powder and the nano-scale material are adopted as the filling material and the auxiliary agent, and the set preparation process is combined, such that the cold resistance and the low temperature impact resistance of the final finished product material are increased.

The application provides a chlorobutyl rubber material and a preparation method thereof, and relates to the technical field of rubber materials.A chlorobutyl rubber material comprises the following raw materials in parts by mass: chlorobutyl rubber 100 parts, carbon black 70-80 parts, plasticizer 25-30 parts, zinc oxide 4-6 parts, magnesium oxide 2-3 parts, hydrotalcite 2-3 parts, stearic acid 0.3-0.6 parts, antioxidant 1-3 parts, oleic acid amide 2-3 parts, vulcanization accelerator 0.5-1.5 parts, and microcrystalline wax 0.3-0.6 parts.The chlorobutyl rubber material has the excellent characteristics of low-temperature resistance, low-pressure change and tear resistance.

The invention relates to the technical field of sealing strips, and provides a rubber sealing strip and a preparation method thereof.The rubber sealing strip is prepared from, by weight, 55-65 parts of nitrile rubber, 5-7 parts of natural rubber, 40-50 parts of filler, 15-20 parts of plasticizer, 0.5-1.5 parts of anti-aging agent, 0.4-0.8 part of vulcanizing agent, 0.8-2 parts of accelerant, 0.5-1 part of stearic acid and 2-4 parts of zinc oxide. The filler is prepared from the following raw material components in parts by weight: 80 to 100 parts of carbon black, 2 to 5 parts of oleamide and 1 to 3 parts of methyl 2-chloro-4-aminobenzoate. Through the technical scheme, the problem of low mechanical strength of the rubber sealing strip in the related technology is solved.

The crystal extraction device comprises a water chilling unit, the top end of the side wall of the water chilling unit is electrically connected with a power line, the side wall of the water chilling unit is fixedly connected with a plurality of laying assemblies side by side at equal intervals, and the bottom end of the water chilling unit is fixedly connected with a plurality of moving assemblies in a rectangular array mode. And one side of the top end in the moving assembly is fixedly connected with an emergency braking assembly. According to the scheme, the crystal extraction device is provided with the emergency braking assembly, when the water chilling unit is moved, the water chilling unit needs to be braked emergently, at the moment, a worker steps on a mounting plate in the emergency braking assembly downwards, and then one end of the mounting plate moves downwards; the emergency brake pads are made of rubber components, so that friction force between the emergency brake pads and the moving wheels can be increased, the moving wheels stop working, and the phenomenon that the water chilling unit collides with other objects during transferring is avoided.

The present invention relates to a waterproof and stain-resistant composite woven fabric and its preparation process, belonging to the technical field of woven fabrics. The composite woven fabric prepared by the present invention comprises a film coating layer and a woven layer from top to bottom. The woven layer is woven from polypropylene fibers and nylon fibers, and 5 wt% of oleic acid amide is added to the polypropylene fibers. The film coating layer is coated with a waterproof and stain-resistant coating. The formula of the waterproof and stain-resistant coating comprises the following components in parts by weight: 45-55 parts of aqueous polyurethane emulsion, 5-15 parts of aqueous acrylic emulsion, 10-20 parts of filler, 3-5 parts of polydimethylsiloxane, 3-5 parts of dimethyl silicone oil, and 1-3 parts of film-forming promoter. The composite woven fabric prepared by the present invention has the characteristics of good waterproofness and long-term stain resistance.

The application discloses an easy-to-process salt-fog-resistant electromagnetic shielding rubber material and a preparation method and application thereof, and relates to the technical field of electromagnetic shielding materials.The application comprises the following components by weight: 100 parts of silicone rubber kneaded glue or fluorosilicone rubber kneaded glue, 1-5 parts of a structure control agent, 200-500 parts of conductive metal powder, 5-20 parts of a conductive reinforcing agent, 4-10 parts of an internal lubricant, 3-8 parts of a composite coupling agent, 1-4 parts of a vulcanizing agent and 1-2 parts of an auxiliary crosslinking agent.The internal lubricant such as oleic acid amide is used to modify the electromagnetic shielding rubber, so that the electromagnetic shielding rubber has the properties of easy processing and salt-fog resistance, and has great significance for improving the electromagnetic protection capacity and optimizing the production process.

The application discloses a water-soluble core material cigarette explosion bead and a preparation method thereof. The explosion bead is composed of an outer layer wall material, an inner layer wall material and a core material. The outer layer wall material is gelatin, and the inner layer wall material is a blend containing a hydrophobic material, a wax material, a long-chain lipid and an interfacial adhesive. The interfacial adhesive is at least one selected from nano-mica sheet, nano-calcium carbonate and oleic acid amide. The core material is selected from a mixed solution or a solvent composed of a flavor and / or a natural extract and a solvent. The explosion bead of the application uses gelatin as the outer layer wall material to provide strength and ensure the roundness of the explosion bead. The inner layer wall material provides hydrophobicity. Meanwhile, the interfacial adhesive is used to improve the melt index of the blend and increase the bonding force between the outer layer wall material and the inner layer wall material. The three-layer structure ensures the water content, solves the problems of the strength and the roundness of the explosion bead, and improves the qualified rate of product preparation. The preparation method of the application adopts three-layer drop heads for one-time solidification forming, and is simple and controllable.

The invention discloses a preparation method of a polyolefin composition, which comprises the following steps: mixing polyethylene, ethylene propylene rubber, ethylene propylene diene monomer, an antioxidant and a cross-linking agent, banburying and extruding to prepare a first semi-finished product, uniformly mixing the first semi-finished product with polypropylene and paraffin oil, extruding to prepare a second semi-finished product, mixing the second semi-finished product with oleamide, and extruding; the polyolefin composition comprises the following raw materials in percentage by mass: 40%-70% of polyethylene, 10%-33% of polypropylene, 5%-10% of ethylene propylene rubber, 6%-10% of ethylene propylene diene monomer, 1%-3% of a release agent, 2.5%-3.5% of a cross-linking agent and 2%-3% of an antioxidant, and paraffin oil and oleamide form the release agent according to the feeding mass ratio of 1: (0.1-0.5); the polyolefin composition prepared by the method disclosed by the invention can be used as an insulating material of an insulating layer of a photovoltaic cable, is easy to peel, is not easy to disorderly wires during extrusion, and has the advantages of good processability, high production efficiency and simple and easily available raw materials.

This invention belongs to the field of pharmaceutical technology. This invention provides the application of a three-component combination of hexadecanoic acid, stearonitrile, and oleamide in the preparation of a drug for the treatment of eczema; this invention demonstrates that the three-component combination of hexadecanoic acid, stearonitrile, and oleamide can treat eczema safely and without side effects; at the same time, it can improve the speed of onset and duration of efficacy in eczema treatment.