49results about How to "Increase the number of hydroxyl groups" patented technology

The invention relates to a preparation method and an application application method of a metal-free catalyst used for fixed bed acetylene hydrochlorinate preparation of vinyl chloride. Compared with other metal-free catalysts prepared through dipping-calcining method, the metal-free catalyst used for fixed bed acetylene hydrochlorinate preparation of vinyl chloride possesses following advantages:the nitrogen content of the metal-free catalyst used for fixed bed acetylene hydrochlorinate preparation of vinyl chloride is increased through in-suit doping combined ammonia gas treatment; the catalyst specific surface area is increased effectively through calcining of a precursor with polytetrafluoroethylene at a certain heating program, and at the same time nitrogen sulfur codoping and oxidation are adopted to increase the ratio of active sites and the number of surface oxygen-containing function groups, so that the metal-free catalyst possesses relatively activity and selectivity in fixedbed acetylene hydrochlorinate preparation of vinyl chloride. The preparation method is green, and is friendly to the environment; the raw materials are widely available and cheap; the metal-free catalyst can be used for replacing toxic mercuric chloride catalyst; and the application prospect in industrialized production is promising.

The invention relates to a method for preparing a special nanometer carbon fiber for an epoxy resin composite conductive material and belongs to the technical field of conductive material preparation.The method comprises culturing water fennel to obtain a large amount of roots with excellent adsorption effects, putting the water fennel into a metal salt solution with a citric acid solution, carrying out water planting to convert inorganic transition metal ions into organic metal ions through metabolism of water fennel so that water fennel roots gathering transition metal ions are obtained, mixing the water fennel roots gathering transition metal ions and anhydrous methanol to obtain carbon fuel, carrying out combustion at the normal temperature through a clean glass plate as a nanometer carbon fiber deposition base, scraping the nanometer carbon fibers obtained by the combustion and carrying out hydroxylation and fermentation modification to obtain the nanometer carbon fibers. The method simplifies the process of preparing the catalyst, reduces the carrier gas and high temperature conditions, reduces the cost and has a wide application prospect.

The invention relates to the technical field of foundation reinforcing, in particular to a method for reinforcing a liquefied sand foundation through zeolite and coal ash. According to the method, thezeolite and the coal ash are jointly mixed and ground, and hydroxylation modification is carried out through absolute ethyl alcohol; hydroxylated mixed powder, overdue milk rich in protein and tofukasu are mixed, mildewed, sealed and fermented; microorganisms are used for degrading the milk and the tofukasu, and a large number of radical groups are generated; under the action of the microorganisms, the radical groups are introduced into a hydroxylated mixture; and hydrogen bond adsorption and chemical bonding occur on the radical groups on the surface of the mixture and particle surfaces of liquefied sand, a cross-linked network reinforcing layer is formed in the sand foundation, and therefore the sand is reinforced. According to the method, microorganisms for generating urease are addedinto the reinforcing materials, a mineralization effect is achieved through the microorganisms, carbonate crystals are induced to deposit in the liquefied sand, formed high-strength calcium carbonatecrystals achieve a filling and supporting effect on the sand, the reinforcing effect is further improved, and the application prospects are wide.

The invention relates to the field of paper manufacturing, in particular to a production method of quick-drying bible paper, comprising the following steps: (1) mixing and stirring fiber raw materials with titanium dioxide, sodium carboxymethyl cellulose, and water; (2) surfing the Forming, pre-dehydration and drying to obtain ultra-thin paper sheets; (3) using adhesives containing silane-based polymers to bond between two ultra-thin paper sheets; (4) polymerizing with branched polyhydroxyl groups Sizing agents, retention aids, and lubricant fillers are double-sided sizing; (5) After dehydration, drying, and calendering, quick-drying Bible paper is obtained. The present invention uses polyhydroxy polymeric sizing agent to sizing the paper, increasing the number of hydroxyl groups on the surface of the paper, improving the water absorption capacity of the paper, ensuring the rapid separation of water and pigment components after the paper absorbs ink, and achieving the effect of quick drying. Hydrogen bonds are formed between the hydroxyl groups on the cellulose on the surface of the paper to increase the strength of the paper; a hydrophobic layer is added in the middle of the paper to ensure that the paper will not show through after absorbing water.