36results about How to "Less prone to curling" patented technology

The invention discloses a kind of hydrophobic association polyacrylamide and its preparative method. The product is the copolymer of acrylamide and dendritic I branch-like hydrophobic monomers, in which, the amount of monomeric unit of acrylamide is integer of 124013~139860, the amount of monomeric units of dendritic hydrophobic monomers is integer of 140~6527. In the invention, high degreed branching hydrophobic monomers are inlet on a chain of macromolecules by the way of micelles' copolymerization, the monomers can promote the capability of hydrophobic interaction of polymers' chain without any curling for its greater hydrophobic volume, so a better viscosity can be achieved. The content of the hydrophobic chain can be controlled by the way of controlling the amount of hydrophobic monomers to improve the solubility of copolymer

The invention provides a hydrophobic polymer graft modified acrylamide polymer and a preparation method thereof, mainly for solving the problem in the prior art that general acrylamide polymers have poor temperature resistance, poor resistance to salinity, poor ageing-resistance performance and poor displacement effect. The chemical general formula of the hydrophobic polymer graft modified acrylamide polymer is P-g-X, wherein P is polyacrylamide or acrylamide polymer, X is hydrophobic polymer the molecular chain structure of which is in a form of homopolymerisation, random copolymerization or block copolymerization, and the viscosity average molecular weight of the graft compound is more than or equal to seventeen million. The adoption of the hydrophobic polymer graft modified acrylamide polymer and the preparation method thereof well solves the problem in the prior, and the technical scheme can be used in industrial production and displacement of reservoir oil.

The invention discloses an acrylamide copolymer and a preparation method and an application thereof, wherein the acrylamide copolymer contains an acrylamide structural unit and a structural unit A shown in a formula (I), the viscosity average molecular weight of the acrylamide copolymer is more than 30 millions, M1 and M2 can be same or different and respectively can be sodium or potassium. The invention also discloses a preparation method of the acrylamide copolymer, and an application of the acrylamide copolymer as an oil displacement agent, the acrylamide copolymer of the present invention has the advantage of high temperature resistance, and has good tackifying effect under high ore degree, the acrylamide copolymer can be widely used in petrochemical industry filed, and especially is taken as an oil-displacement agent for tertiary recovery.

The invention discloses a production method of skin-moistening moisture-keeping paper special for mothers and infants. The skin-moistening moisture-keeping paper comprises the following component: a bleached soft wood and broadleaf wood pulp plate. The skin-moistening moisture-keeping paper is prepared through the following steps: S1, taking the bleached soft wood and broadleaf wood pulp plate asslurry, and respectively dispersing the slurry into long-fiber slurry and short-fiber slurry by a hydraulic pulper; S2, beating the long-fiber slurry to a beating degree of 19-22 degrees SR through adisc mill, defibering the short-fiber slurry through a high-frequency defibering machine, mixing the defibered short-fiber slurry with the long-fiber slurry according to a proportion of 60:40, and beating the obtained mixture to a beating degree of 26-30 degrees SR through a leveling mill; S3, adding a softening agent of 0.8-1.2 kg/T; S4, enabling the prepared slurry to form original paper; S5, carrying out spraying by a spraying device; S6, linking the start-stop of the spraying device with a rewinder program, and reeling up a coiled paper roll by a rewinder; and S7, carrying out packaging. According to the invention, plant extracts are used as raw materials, skins are not damaged easily, the preparation is simple, and the product quality is improved.

The invention provides a polymer-based double-layer nanofiber composite proton exchange membrane, and the proton exchange membrane comprises a polymer layer and two fiber layers compounded with the polymer layer, wherein the polymer layer is located between the two fiber layers; and the polymer layer comprises a polymer electrolyte, and the fiber layer comprises nanofibers. The polymer-based double-layer nanofiber composite proton exchange membrane provided by the invention has good proton conductivity, structural stability and other properties.

The invention relates to the technical field of corrugated paperboards and provides a waterproof corrugated paperboard with good waterproof and dampproof effects, high strength and insusceptibility to deformation. The waterproof corrugated paperboard comprises a corrugated paperboard body, wherein the corrugated paperboard body is prepared from a plurality of layers of single-layer corrugated paperboards sprayed or dipped with a waterproof and dampproof agent by binding through an waterproof adhesive; the upper and lower surfaces of the corrugated paperboard body are provided with buffer layers; and the waterproof and dampproof agent is composed of the following raw materials by weight: 20 to 35 parts of dodecyl dimethyl benzyl ammonium chloride, 30 to 40 parts of octamethylcyclotetrasiloxane, 18 to 25 parts of sodium acrylate, 30 to 40 parts of N-isopropylacrylamide, 10 to 15 parts of butadiene, 10 to 15 parts phenyl diene, 5 to 10 parts of isproportionated potassium rosinate, 30 to 40 parts of trimethylol propane triacrylate, 20 to 30 parts of stearin, 3 to 10 parts of a pH regulator and 50 to 80 parts of water.

The invention discloses a cell cultivation model for artificial cornea reconstruction. The cell cultivation model comprises a carrier bracket for cell cultivation and a supporting shell for supporting the carrier bracket. According to the designed model, firstly the carrier bracket is fixed to the supporting shell made of silica gel, then the carrier bracket is placed in a culture dish for cell cultivation, the supporting shell has a good supporting function on the carrier bracket, especially a thin-layer bracket, and the carrier bracket can be not prone to displacement and curl in the cultivation process.

The invention provides a hyper-branched macromolecular flocculation demulsifying agent, which has the characteristics of many terminated functional group, high dissolubility and low viscosity. The hyper-branched macromolecular flocculation demulsifying agent is not liable to bend in a saline medium and has large hydrodynamic radius, high flocculation capability and high flocculation speed. Meantime, the hyper-branched macromolecular flocculation demulsifying agent has a good demulsifying effect on oil-water emulsion due to the branched structure and high electric charge density.

The invention provides an acrylamide copolymer, as well as a preparation method and an application thereof. The acrylamide copolymer comprises a structural unit as shown in a formula (1) and a structural unit as shown in a formula (2), wherein R1 and R2 are respectively hydrogen or alkyl of C1-C4 independently, R3 is alkyl of C1-C8, and M1 and M2 are respectively at least one of hydrogen, potassium and sodium independently; based on the total mole number of the structural units in the acrylamide copolymer, the content of the structural unit as shown in the formula (1) is 30-99 molar percent, the content of the structural unit as shown in the formula (2) is 1-70 molar percent; and the viscosity-average molecular weight of the acrylamide copolymer is 31-37 millions. A temperature-resistance salt-resistance product prepared from the acrylamide copolymer has the characteristic of high molecular weight, and the acrylamide copolymer has an advantage of greatly thickening, and can be used as an oil-displacing agent for tertiary recovery of a high temperature and high salinity reservoir.

The invention relates to a graft-modified polyacrylamide and a preparation method thereof, and is used for mainly solving the problems in the prior art that polyacrylamide has poor temperature resistance, poor salt resistance, poor aging resistance and poor displacement efficiency. The graft-modified polyacrylamide has the chemical formula of HPAM-g-R, wherein HPAM is an ultra-high molecular weight polyacrylamide, R is selected from one of PEO-b-PNAM, PPO-b-PNAM, P(EO-r-PO)-b-PNAM, PEO-b-PPO-b-PNAM or PPO-b-PEO-b-PNAM, EO represents epoxy ethane, PO represents propylene oxide, PEO represents polyethylene oxide, PPO represents polypropylene oxide, and PNAM represents poly(N-substituted acrylamide); the viscosity average molecular weight of the graft-modified polyacrylamide is not less than 27000000; the preparation method is provided. Through adopting the above technical schemes, the problems are relatively well solved, and the graft-modified polyacrylamide can be used in industrial production of a polymer oil-displacing agent and in oil displacement of a high-temperature high-salinity oil reservoir.

The invention relates to an acrylamide monomer and a preparation method, the method comprises the following steps: contacting 3-methyl-2-butylene, a sulfonating agent and acrylonitrile for 1-4 hours under -5-15 DEG C to obtain the acrylamide monomer in a formula (I). The invention also relates to the acrylamide copolymer, the preparation method and the application. The preparation method comprises the following steps: under the condition of a solution polymerization reaction, under the existence of an initiator, a monomer mixture is performed with polymerization, the monomer mixture contains acrylamide and a monomer C, the viscosity-average molecular weight of the obtained after polymerization is more than 30 million by the condition of the solution polymerization reaction. The acrylamide copolymer is capable of resisting high temperature, and has good viscosifying effect under high ore degree, can be widely used in petroleum chemical field, and can especially be a displacement agent for three-time oil extraction oil. (img file='DDA00002332890900011.TIF' wi='747' he='220' /) is formula (I).

The invention relates to an acrylamide monomer and a preparation method. The method comprises the following steps: contacting styrene, a sulfonating agent and acrylonitrile for 1-4 hours under -5-15 DEG C to obtain the acrylamide monomer. The invention also relates to the acrylamide copolymer, a preparation method and an application. The preparation method comprises the following steps: under the condition of a solution polymerization reaction, under the existence of an initiator, a monomer mixture is performed with polymerization, the monomer mixture contains acrylamide and a monomer C, and the viscosity-average molecular weight of the obtained after polymerization is more than 30 million by the condition of the solution polymerization reaction. The acrylamide copolymer is capable of resisting high temperature, and has good viscosifying effect under high ore degree, can be widely used in petroleum chemical field, and can especially be a displacement agent for three-time oil extraction oil.

The invention discloses a composite rock slice slurry. The composite rock slice slurry comprises a component A and a component B, and the component A comprises, by weight, 2-15 parts of a pigment slurry, 5-25 parts of a zeolite liquid and 30-90 parts of an aqueous hydroxypropene dispersion; the pigment paste comprises a pigment, a coupling agent and a directional agent; the zeolite liquid comprises a zeolite powder, a hydrophobic agent and a wetting agent; the component B comprises 70-90 parts by weight of a water-dispersible isocyanate curing agent; and a weight ratio of the component A to the component B is (5-7):1. The pigment slurry, the zeolite liquid, the aqueous hydroxypropylene dispersion and the water-dispersible isocyanate curing agent synergistically act according to a certain ratio to form the composite rock slice slurry, and composite rock slices prepared from the composite rock slice slurry have the characteristics of excellent wear resistance, excellent water resistance,excellent color retention, short curing time, no after-tack and good storage stability.