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

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.