40results about How to "Reduce cohesive energy" patented technology

The invention relates to a coating for the inner wall of an oil field pipeline and a preparation method thereof. A component A of the coating consists of the following components in part by weight: 15 to 50 parts of trifluoroethylene-vinyl ether fluoro-resin, 8 to 30 parts of lubricating filler, 1 to 3 parts of dispersing auxiliary agent, 10 to 20 parts of solvent, 15 to 45 parts of colour paste and 1 to 6 parts of lubricating auxiliary agent, wherein the colour paste consists of the following components in part by weight: 40 to 80 parts of film forming resin, 1 to 3 parts of dispersing auxiliary agent, 10 to 40 parts of solvent and 2 to 40 parts of pigment; and the film forming resin is three kinds of biphenol A epoxy resins, namely biphenol A epoxy resinE-20, biphenol A epoxy resin E-12 and biphenol A epoxy resin E-06, or is trifluorochloroethylene-vinyl ether fluoro-resin. A component B of the coating is a curing agent aromatic toluene diisocyanate addition product. Before construction, the component A and the component B are mixed according to a weight ratio of 10 to 1. The coating of the invention is used for coating the inner wall of the oil field pipeline, is corrosion resistant, makes the inner wall of the pipeline have hydrophobic performance and fulfils the aim of reducing resistance and enhancing effect.

The invention discloses a preparation method for nano calcium carbonate special for low modulus silicone adhesive. The preparation method is implemented according to the following steps: 1) preparing Ca(OH)2 slurry; 2) carrying out carbonization; 3) adding a crystal form conditioning agent; 4) carrying out surface treatment; 5) adding a modulus conditioning agent; 6) carrying out filter pressing, drying and smashing on calcium carbonate boiled size in after the modulus conditioning agent is added to prepare the nano calcium carbonate special for the low modulus silicone adhesive, wherein the moisture of the nano calcium carbonate is less than or equal to 0.3%. The nano calcium carbonate prepared by the preparation method has good compatibility with polydimethylsiloxane, and cohesive energy is reduced after the nano calcium carbonate and the polydimethylsiloxane are mixed so as to achieve an effect of lowering silicone adhesive product modulus.

The invention discloses a polyamide material for improving the adhesion effect of paint as well as a preparation method and application of the polyamide material. The polyamide material is composed ofthe following components in percentages by weight: 20-90% of semi-crystalline polyamide, 8-70% of glass mineral fibers, 1-6% of an ion copolymer, 0.2-3% of a plasticizer, 0.3-0.5% of a lubricant, 0.2-0.6% of an agent resistant to long-term heat aging, and 0.2-0.5% of an antioxidant. According to the method, the ion copolymer having a carboxyl side group in a molecular side chain and the polyamideplasticizer capable of suppressing hydrogen bonding from being formed among molecular chains of the semi-crystalline polyamide and reducing the crystallization ability of a polyamide material are used to modify the semi-crystalline polyamide material to obtain high fluidity and an unexpectedly good coating adhesion effect.

The invention provides a polyacrylonitrile-based carbon fiber spinning solution and a preparing method of the polyacrylonitrile-based carbon fiber spinning solution. The spinning solution is prepared from monomers, radical initiators and solvent reaction liquid through copolymerization; the mass concentration of the monomers in the reaction liquid is 15 to 35 percent; the radical initiators account for 0.2 to 1 percent of the monomer total weight; the balance is the solvent; the monomers comprise acrylonitrile monomers accounting for 95 to 99.5 percent of the total mass of the monomers and copolymer monomers accounting for 0.5 to 5 percent of the total mass of the monomers; the copolymers are hydrophilic copolymer monomers containing 2-methylene butyric acid groups. The preparing method comprises the following steps that (1) the raw materials are proportionality added into a reaction kettle, are stirred and mixed, and are subjected to nitrogen bubbling for 10 to 40 minutes; (4) under the nitrogen protection, the reaction is taken at the constant temperature being 50 to 70 DEG C for 6 to 36h; (3) residue monomers and bubbles are removed to obtain the spinning solution. The designed copolymer monomers can improve densification agents of resin hydrophilia and can also improve the oxygen permeability and the spinnability. The spinning solution obtained by the method has high hydrophilicity and good heat release performance.

The invention relates to the technical field of cable processing and production, and discloses a method for preparing a modified polyvinyl chloride sheath used in cable production. Nanomaterials are used to modify polyvinyl chloride, and the addition of metal nanoparticles increases the The distance between the polyvinyl chloride copolymer molecules reduces the cohesive energy of the molecular chain, thereby reducing the environmental stress cracking performance. The proportion of fractures in the test of low-temperature impact embrittlement performance at minus 40°C is within 0-0.01%, which can meet the requirements. The requirement of working at minus 40°C improves the comprehensive usability of polyvinyl chloride. It can pass the combustion test of UL910 or NFPA 262 when used as a cable sheath. The oxygen index reaches 50, and the amount of smoke is low. Oxygen stability and service life are significantly improved, and the resistance to cracking in stressful environments is improved.

The invention belongs to the technical field of plastic pipe preparing and particularly relates to a preparing method for an HDPE pipe. By means of the preparing method, kaolin, aluminum oxide, titanium dioxide, aluminum phosphate and water are mixed, an outer rubber pipe layer is entangled and wrapped by silicon-aluminum reinforced fibers to be arranged into the inner layer of a double-layer corrugated pipe die, the inner layer is filled with filling glue, the double-layer corrugated pipe die is put into a hot pressing device to be subjected to hot pressing, and the HDPE pipe is extruded. Bymeans of the preparing method for the HDPE pipe, the heat conduction coefficient of graphite powder with the fineness being 200 meshes is relatively large, a cooling effect is achieved, and a protection effect is achieved on the HDPE pipe through the silicon-aluminum reinforced fibers. High density polyethylene powder is adopted as the main raw material to prepare an outer rubber pipe layer in a vulcanization forming manner, the HDPE pipe is enhanced through silicon-aluminum reinforced fiber layer wrapping, EPDM has low-temperature elasticity, and toughness and elasticity of the HDPE pipe areimproved; in addition, the EPDM has the good oil resistance property and the good acid and alkali corrosion resisting performance; and a layer of anti-corrosion protection film is provided, meanwhile,zinc methacrylate is adopted as a heat-resisting antioxidant, compatibility of components doped in the HDPE pipe is improved, the anti-corrosion performance is improved, and a wide application prospect is achieved.

The invention relates to a crude oil demulsifier used at normal low temperature. The demulsifier includes the following components: silicone polyether having a mass percent of 10-50%, the viscosity of200-300 cSt, the HLB value of 7-10, and a closed-cup flash point of more than 60 DEG C, and a solvent including a mixture of one or more and having the mass percent of 50-90%. The silicone polyetherin composition of the crude oil demulsifier has different structures and molecular weight distribution; the crude oil demulsifier has a high efficiency oil-water demulsification effect; siloxane has low surface tension, low cohesive energy and low temperature sensitivity; demulsification can be achieved at the low temperature of 30 DEG C; the addition amount is reduced by more than 50% than that of polyether surfactant alone; and the dehydration rate is fast, the demulsification effect is good, and the comprehensive cost is reduced.

The invention provides a method for preparing polyacrylonitrile (PAN) precursors for carbon fibers. The method first adopts an aqueous phase precipitation polymerization process to produce PAN polymer, specifically: ammonium persulfate-sodium bisulfite-ferrous sulfate is used as the initiation system, vinyl acetate is used as the second comonomer, and carboxylic acid vinyl The compound is the third comonomer, sulfuric acid is used as the pH regulator, and the precipitation copolymerization reaction is carried out with acrylonitrile in the water phase with a pH value of 2 to 5. After the reaction is completed, the reaction system is alkalized with ammonia water, and then After separation, washing and drying, the PAN polymer powder is obtained; then, the PAN polymer powder is dissolved in a polar organic solvent to prepare a PAN spinning solution, and then the PAN precursor is prepared by a wet spinning process. The method has low cost and high production efficiency, and the prepared PAN precursor has a good structure, can meet the requirements of large-scale production of carbon fibers, and is beneficial to improving the performance of carbon fibers and reducing production costs.

The invention discloses fluorine-containing hydrophobic-associating surface-active polyacrylamide which has the following molecular structure (please see the structure in the description), wherein x=100, y=10-20, z=0.05-1.5, n=4 or 6 or 8, and R and R' represent alkyl. The prepared polyacrylamide has the advantages that the excellent tackifying property, heat resistance and salt tolerance are achieved, the surface tension of water can be reduced to 24-32 mN / m, and the good application prospect on tertiary oil recovery, drilling fluid and paint is achieved.

The invention discloses a fluorine-containing double-tail hydrophobically associating polymer and a preparation thereof. According to the polymer, a hydrophobic monomer with fluorine-containing double tails and salt-resistant sulfonic acid groups are introduced into macromolecules. Experimental results indicate that the hydrophobically associating surface active polymer can lower surface tension of water to 23-30 mN / m and can further improve oil recovery by 14.12-16.25%. The hydrophobically associating polymer is good in viscosity increasing performance and heat resistance and salt tolerance and low in surface tension and has good application prospect in the aspects of tertiary recovery, drilling fluid and coating.

The invention belongs to the technical field of high-efficiency and safe production in mines, and discloses an integrated anti-reflection enhancer for coal and gas mining, a preparation method and an application thereof. According to mass percentage, it consists of 6%-10% of 20mol / l concentrated nitric acid, 1 %-5% sodium N-lauroyl creatine, 2%-6% 1-butyl-3-methylimidazolium chloride and mine dust control water. The physical and chemical modification of the coal body by the coal and gas mining integrated enhancer provided by the invention can increase the wettability of the coal body, suppress and reduce the generation of dust in the coal seam mining process, greatly improve the permeability of the coal body, and improve the coal seam Occurrence and mining conditions are conducive to the efficient development and utilization of coalbed methane, improving coalbed methane mining to alleviate energy shortages, preventing gas disasters in underground coal mines, and reducing greenhouse gas emissions. Safe and efficient production level.

The invention provides a polyacrylonitrile-based carbon fiber spinning solution and a preparing method of the polyacrylonitrile-based carbon fiber spinning solution. The spinning solution is prepared from monomers, radical initiators and solvent reaction liquid through copolymerization; the mass concentration of the monomers in the reaction liquid is 15 to 35 percent; the radical initiators account for 0.2 to 1 percent of the monomer total weight; the balance is the solvent; the monomers comprise acrylonitrile monomers accounting for 95 to 99.5 percent of the total mass of the monomers and copolymer monomers accounting for 0.5 to 5 percent of the total mass of the monomers; the copolymers are hydrophilic copolymer monomers containing 2-methylene butyric acid groups. The preparing method comprises the following steps that (1) the raw materials are proportionality added into a reaction kettle, are stirred and mixed, and are subjected to nitrogen bubbling for 10 to 40 minutes; (4) under the nitrogen protection, the reaction is taken at the constant temperature being 50 to 70 DEG C for 6 to 36h; (3) residue monomers and bubbles are removed to obtain the spinning solution. The designed copolymer monomers can improve densification agents of resin hydrophilia and can also improve the oxygen permeability and the spinnability. The spinning solution obtained by the method has high hydrophilicity and good heat release performance.

The invention discloses an organic silicane high-adsorbing resin, which is copolymerized by soluble polycondensation product and vinyl monomer free radical with the content of organic silica as 0.1-5wt% as vinyl monomer, wherein the organic silicane is represented through Y (CH2) nSiX3 (Y is vinyl, epoxy radical, mercapto radical and so on; X is methoxyl, ethyoxyl, isopropoxy and so on); the resin adsorbs deionized water and salt water, which displays optical, heat and ultraviolet stability in the agricultural and hygiene domain.

The invention discloses a low-softening point thermoplastic polyurethane hot melt adhesive and a preparation method thereof. The hot melt adhesive comprises the following components: 95-100 parts by weight of polyester polyol; 0-5 parts by weight of polyether diol; diisocyanate; and a chain extender. The preparation method consists of: adding polyester polyol and polyether diol into a reaction kettle, raising the temperature to 100DEG C-130DEG C under the protection of nitrogen, conducting dehydration till no water vapor is steamed, and lowering the temperature to 60-70DEG C; adding diisocyanate into the reaction kettle evenly within 2-3h, then leaving the materials to react for 2-4h at a temperature of 110-120DEG C; and adding the chain extender into the reaction kettle to react till wire drawing, and then stopping heating. The thermoplastic polyurethane hot melt adhesive provided in the invention has a softening point lower than 100DEG C and bonding strength on aluminum Ly-12 up to over 4MPa. Besides, the preparation method of the thermoplastic polyurethane hot melt adhesive is simple, reaction conditions are mild, and each technology parameter is easy to control, so that the thermoplastic polyurethane hot melt adhesive can be produced in large scale.

The invention discloses a polyurethane court material and a preparation method thereof. The technical scheme mainly includes that the polyurethane court material comprises, by weight, 60-100 parts of polyether polyol, 8-15 parts of diphenylmethane diisocyanate, 15-30 parts of reinforcing fillers, 10-20 parts of aromatics removing solvent oil, 0.05-0.1 part of composite catalysts and 0.5-3 parts of auxiliaries. In an environment with the aromatics removing solvent oil, the polyether polyol and water in other fillers can be taken out, the steric hindrance of the aromatics removing solvent oil is reduced, the polarity difference among the aromatics removing solvent oil and other components is decreased, the aromatics removing solvent oil is prevented from forming hydrogen bonds with hydroxyl of alcohol and affecting reaction speed, dehydration efficiency can be improved, and reaction thoroughness is enhanced.