139results about How to "High molecular weight" patented technology

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

According to the method, a one-pot copolymerization method is adopted, MBAA and borax serve as cross-linking agents, zwitterionic polyelectrolyte hydrogel containing SBMA, PVA, THMA and AMPS is prepared, and the zwitterionic polyelectrolyte hydrogel has excellent adhesion performance and biocompatibility and is suitable for the field of biological medicine. According to the method, the physical characteristics of the hydrogel are enhanced due to crosslinking sites and hydrogen bonds of polyvinyl alcohol. The cationic and anionic groups of SBMA improve the adhesion performance, and the reaction monomer THMA provides hydrogen-bond interaction to further promote adhesion, so that the prepared hydrogel adhesive shows excellent adhesion performance and biocompatibility, and is suitable for biological medicine application of wound dressing, drug release systems, tissue engineering and the like.

The invention relates to the field of phenolic resin adhesives, and particularly discloses a preparation method of a phenolic resin adhesive for a bamboo oriented strand board, which comprises the following steps: (1) phenol activation: adding phenol and a basic catalyst aqueous solution into a reaction kettle, and activating to form an intermediate state of phenate negative ions; (2) addition stage: adding a high-concentration formaldehyde reactant into the reaction kettle, and carrying out heat preservation reaction to generate hydroxymethyl phenol; (3) heating and replenishing: heating to 80 + / -2 DEG C, keeping the temperature, replenishing the formaldehyde aqueous solution into the reaction kettle, and keeping the temperature for 20-25 minutes; (4) polycondensation stage: adding a basic catalyst aqueous solution, heating to 90 + / -2 DEG C, and carrying out heat preservation reaction; and (5) terminating the reaction: after the heat preservation reaction, detecting the viscosity, cooling, and discharging to obtain the adhesive. The phenolic resin with the solid content of 60% or above can be prepared, the adhesive has excellent bonding performance, and the prepared shaving board is excellent in mechanical strength.

The invention discloses isosorbide type block copolycarbonate as well as a preparation method and application thereof, and belongs to the technical field of organic polymer materials. The problems that isosorbide polycarbonate in the prior art is low in molecular weight, deep in color and luster, fragile in material and the like are solved. The preparation method comprises the following steps: carrying out melt ester exchange polycondensation reaction on dihydric alcohol and isosorbide carbonate serving as raw materials to obtain dihydroxyl-terminated isosorbide ester glycol; rigid amorphous dihydroxyl-terminated isosorbide ester glycol and oligomeric flexible chain dihydric alcohol are connected together, and a molecular chain is reformed, arranged and branched to a certain extent, so that the isosorbide type block copolycarbonate is effectively synthesized. According to the method, the oligomeric flexible chain dihydric alcohol can be effectively introduced to improve the molecular weight and the mechanical property of the isosorbide polycarbonate, so that the problems that the isosorbide polycarbonate is too strong in structural rigidity, fragile in material, deep in color and the like in production and application are solved.

The invention provides a high-barrier aluminum-oxide-plated two-way stretching polylactic acid film and a preparation method thereof.The high-barrier aluminum-oxide-plated two-way stretching polylactic acid film comprises a plastic base layer and an aluminum oxide layer, and the film base layer is a three-layer co-extrusion two-way stretching film composed of a surface layer, a core layer and an inner layer in sequence; the inner layer is combined with the aluminum oxide layer; the surface layer and the inner layer are prepared from the following raw material components in percentage by mass: 81.5%-88.4% of polylactic acid, 10%-15% of a reinforcing agent, 1.5%-2.0% of a compatilizer and 0.1%-1.5% of an anti-blocking agent; the core layer is prepared from the following raw material components in percentage by mass: 63 to 68.5 percent of polylactic acid, 30 to 35 percent of reinforcing agent and 1.5 to 2.0 percent of compatilizer. The high-barrier aluminum-oxide-plated biaxially oriented polylactic acid film has excellent heat resistance, rigidity and stiffness and good transparency, and the application of the high-barrier PLA film in the field of food packaging is expanded.

The invention provides an anti-CD38 nano antibody as well as a preparation method and application thereof. Specifically, the invention provides an anti-CD38 nano antibody, an anti-CD38 antibody, a corresponding humanized antibody, a chimeric antigen receptor, a fusion protein, a recombinant protein, polynucleotide, an expression vector, a host cell and the like, as well as a preparation method and application of the anti-CD38 nano antibody and the anti-CD38 antibody. The anti-CD38 nano antibody provided by the invention can reach a protein concealment epitope which cannot be approached by a conventional antibody, can reach higher affinity compared with the prior art, is superior to a positive control Darumumab, and has higher patent medicine value and potential.

The invention relates to the technical field of high polymer materials, in particular to a preparation method of nylon 46, which comprises four steps of salifying, primary polymerization, pre-polymerization and solid-phase tackifying, in the salifying stage, 100 parts by weight of adipic acid and 800-1000 parts by weight of methanol are added into a salifying kettle, the temperature is raised to 40-60 DEG C, 55-60 parts by weight of 1, 4-butanediamine is added into the salifying kettle, and the mixture is heated to 40-60 DEG C; at the same time, maintaining the temperature at 40-60 DEG C to react for 2-3 hours, cooling to 20-30 DEG C, discharging the material in the salifying kettle, and filtering and drying in vacuum to obtain nylon 46 salt; in the initial polymerization stage, nylon 46 salt reacts with water at 180-210 DEG C, the water amount of a reaction system is controlled to maintain a liquid state, in the pre-polymerization stage, a continuous reaction mode is adopted to remove moisture, pre-polymer particles are obtained through bracing and pelletizing, and finally the high-viscosity nylon 46 polymer is obtained through solid-phase tackifying. The method can be used in the fields of machinery, automobiles, electronics, electrical appliances, aviation and aerospace industries and the like.

The invention provides a polyester particle, a preparation method thereof and an injection filling product, the preparation method comprises the following steps: pre-reacting a first reactant with first aliphatic chain diol in the presence of a first catalyst to obtain a prepolymer; the prepolymer and a second reactant are subjected to ester exchange reaction in the presence of a second catalyst, polyester is obtained, and the number-average molecular weight of the polyester ranges from 30000 Da to 150000 Da; crushing polyester, and sieving to obtain polyester particles; wherein the first reactant comprises one or more of a hydroxy carboxylic acid compound, an organic anhydride compound and a first ester compound; the second reactant comprises one or more of a second ester compound, second aliphatic chain diol and aliphatic chain diacid, and the number-average molecular weight of the second reactant is 70 Da to 10000 Da. According to the preparation method provided by the invention, polyester with relatively high molecular weight can be obtained, so that preparation of polyester particles and application of the polyester particles in the field of injection filling are facilitated.

The invention discloses a cationic dye dyeable regenerated polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the cationic dye dyeable regenerated polyester fiber comprises the following components: waste polyester, sodium bis (2-hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol, the method comprises the following steps: mixing waste polyester, sodium bis (hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol according to a certain mass ratio, extruding the mixture in a twin-screw extruder, carrying out semi-depolymerization on the waste polyester by using the sodium bis (hydroxyethyl) isophthalate-5-sulfonate and the long-chain dihydric alcohol to obtain a semi-depolymerization product which is low-molecular-weight polyester with a hydroxyl-terminated structure, feeding the low-molecular-weight polyester into a polycondensation reactor, and carrying out condensation polymerization on the low-molecular-weight polyester with the hydroxyl-terminated structure to obtain the low-molecular-weight polyester with the hydroxyl-terminated structure. The prepared modified polyester can be directly spun or spun after being diced, and the prepared polyester fiber has a cationic dye normal-pressure dyeable effect, can remarkably reduce dyeing energy consumption and material consumption, has good hygroscopicity, improves wearing comfort and can be widely applied to the fields of clothes, home textiles and the like.

The invention discloses a bio-based cyclic ester monomer and a preparation method of corresponding bio-based polyester. The preparation method comprises the following steps: esterifying bio-based unsaturated fatty acid and diol to obtain corresponding unsaturated diester; the bio-based unsaturated diester is prepared into a bio-based unsaturated cyclic ester monomer and a saturated cyclic ester monomer through a reaction based on olefin metathesis in combination with a depolymerization cyclization method and a catalytic hydrogenation method. The method specifically comprises the following steps: preparing a bio-based unsaturated polyester precursor through a polymerization reaction based on olefin metathesis, and preparing a bio-based unsaturated cyclic ester monomer through a depolymerization cyclization method; carrying out catalytic hydrogenation on the bio-based unsaturated polyester precursor to prepare a bio-based saturated polyester precursor, and preparing a bio-based saturated cyclic ester monomer through a depolymerization cyclization method; the bio-based unsaturated cyclic ester monomer can be subjected to catalytic hydrogenation to obtain a bio-based saturated cyclic ester monomer. The bio-based unsaturated cyclic ester monomer and the bio-based saturated cyclic ester monomer synthesized by the invention can be polymerized to synthesize bio-based polyester with good regularity, and the bio-based polyester is an ecological environment-friendly high polymer material.

The invention relates to a preparation method of a composition with soothing and repairing functions. The preparation method comprises the following steps: stirring and mixing aesculus chinensis fruits, feverfew, oat bran, mangnolia officinalis bark and radix stephaniae tetrandrae, drying, crushing and sieving to obtain mixed powder; adding an ethanol aqueous solution into the mixed powder, heating, refluxing, extracting, filtering, collecting an extracting solution, and extracting residues for the second time; combining the two extracting solutions, and concentrating into paste; dissolving the concentrated paste with hot water, adsorbing with modified D101 macroporous adsorption resin, loading the modified D101 macroporous adsorption resin into a chromatographic column, eluting, collecting an ethanol water eluent, concentrating and drying to obtain a plant composition mixed extract; the preparation method comprises the following steps: taking a plant composition mixed extract, adding the plant composition mixed extract into polyhydric alcohol, heating and stirring until the plant composition mixed extract is completely dissolved, adding water in batches, stirring while adding until the solution is clear and transparent, and filtering by using a 0.22 mu m filter membrane to obtain the composition with the soothing and repairing functions.

The invention provides a production process of a high-wear-resistance and impact-resistance aramid fiber material, and relates to the technical field of material preparation, and the production process comprises the following steps: S1, raw material preparation: selecting a para-aramid fiber prepolymer, a hydroxylated boron nitride nanosheet, N-methyl pyrrolidone, a wear-resistance enhancer and an impact-resistance modifier according to a preset proportion, S2, mixing, S3, polymerization reaction, S5, extrusion molding, S6, extrusion molding, and S7, molding. Transferring the mixed system into a reaction kettle, introducing nitrogen for 35-55 minutes, and replacing air in the reaction kettle to form an aramid polymer; s4, molding processing: cooling the nylon polymer to room temperature, then putting the nylon polymer into spinning solution storage equipment, and winding the stretched fibers; s5, auxiliary treatment, wherein the wound fibers are washed with water and dried; according to the invention, the aramid polymer has a good crystal structure and high molecular weight, the wear resistance of the material is improved, the interface bonding force between the fiber and the matrix can be improved, and the impact resistance of the material is further improved.

This invention relates to the field of catalysts, specifically to a polyethylene catalyst and its preparation method, as well as ultra-high molecular weight polyethylene and its preparation method. The method includes the following steps: (1) under diluent conditions, a magnesium halide precursor, an alcohol compound, and a first internal electron donor undergo a first contact reaction to obtain a first reaction solution; (2) a second internal electron donor is added to the first reaction solution to undergo a second contact reaction to obtain a second reaction solution; (3) a titanium precursor is added to the second reaction solution to undergo a third contact reaction to obtain a third reaction solution; (4) a haloalkane is added to the third reaction solution, followed by a third internal electron donor to undergo a fourth contact reaction. The catalyst prepared by this invention exhibits good catalytic performance.

The invention discloses an aromatic amine compound and a preparation method and application thereof.The aromatic amine compound is large in molecular weight, not prone to migration to the surface when used in rubber and other products, good in compatibility with rubber, not prone to blooming, good in anti-aging effect and capable of achieving the same or even better anti-aging effect compared with an existing anti-aging agent product, and the aromatic amine compound has the good anti-aging effect. The product can be used as an industrial anti-aging agent and a plasticizer.

The invention discloses a high-gloss and high-mechanical-strength PC / ASA composite material and a preparation method thereof. The PC / ASA composite material is prepared from the following raw materials in parts by mass: 40 to 60 parts of PC resin 1, 10 to 30 parts of PC resin 2, 5 to 10 parts of ASA rubber powder, 15 to 30 parts of SAN resin, 2 to 9 parts of PMMA resin, 0.1 to 0.5 part of compound antioxidant, 0.4 to 0.8 part of lubricant, 0.5 to 1.5 parts of compatilizer, 2 to 4 parts of SAN carrier black master batch and 0.1 to 0.5 part of ultraviolet light absorber. Under the conditions of 300 DEG C and 1.2 kg load, the melt index of the PC resin 1 is 8-14 g / 10 min, and the melt index of the PC resin 2 is 18-24 g / 10 min. The prepared high-gloss and high-mechanical-strength PC / ASA composite material has excellent mechanical properties and light-oxygen aging resistance, and the condition that the PC / ASA composite material is uneven is reduced.

The application provides a method for synthesizing a polyaromatic ketone compound, and belongs to the technical field of polymer material preparation, and comprises the following steps: in the condition that a high-boiling-point organic Lewis base is used as a solvent and a Lewis acid is used as a catalyst, a Friedel-Crafts acylation reaction is carried out on a polymerization monomer at a reaction temperature of 100-350 DEG C to obtain the polyaromatic ketone compound, wherein the polymerization monomer is: a) an aromatic diacyl halide compound and an aromatic compound containing two active hydrogen atoms; and / or b) an aromatic compound with an acyl halide at one end and an active hydrogen at the other end. The preparation method can obtain a polyaromatic ketone compound with a high molecular weight.

The invention relates to the field of macromolecules, in particular to a polyamide elastomer raw material composition and application thereof, polyamide elastomer and a preparation method thereof. The raw material composition contains polyamide and polyether, wherein at least one end-capping group in the polyamide is an amino-terminated group; at least one end-capping group in the polyether is an ester group. When the raw material composition is used for preparing the polyamide elastomer, the advantages of high reaction speed, high production efficiency and the like are achieved, the reaction controllability is high, the molecular weight of the product is large, and the type, molecular weight and structure of the soft segment can be adjusted according to application requirements, so that the performance of the elastomer is effectively regulated and controlled.

The application discloses a method for preparing polylactic acid by using an organic base-sulfourea dual catalytic system, and comprises the following steps: under the catalysis of the organic base-sulfourea dual catalytic system, ring-opening polymerization of lactide is carried out under the action of an initiator to obtain the polylactic acid; and the sulfourea is disulfourea or trisulfourea. The sulfourea catalyst is easy to synthesize, the organic base-sulfourea dual catalytic system formed by modular combination of the organic base and the sulfourea has a high decomposition temperature, and therefore has good high-temperature resistance, so that the controllable ring-opening polymerization of lactide in a solution can be realized, and the controllable ring-opening polymerization of lactide at high temperature can also be realized; the catalyst used in polymerization is a hydrogen bond bifunctional catalyst, and the controllable polymerization effect that cannot be achieved when only alkali is used for catalysis can be achieved, so that the polylactic acid has a narrow molecular weight distribution; by adjusting the ratio of lactide, the initiator, the organic base and the sulfourea, the catalytic activity can be further regulated, and the polylactic acid with a high molecular weight and a controllable structure can be obtained.

The application discloses a composite solid decoloring powder and a preparation method thereof, and belongs to the technical field of water treatment agent preparation. The modified nano titanium dioxide is obtained by coating titanium dioxide with 3-methyl acrylic acid sulfopropyl potassium salt grafted polydopamine. The titanium dioxide has photocatalytic effect and antibacterial property, can catalytically decompose pollutants in sewage, inhibit the breeding of bacteria in water, and can catalytically decompose free formaldehyde in dicyandiamide formaldehyde polycondensate. The modified nano titanium dioxide is loaded on phenolic resin foam, and after calcination, the nano titanium dioxide / foam carbon powder is formed. The large specific surface area and porous property of the foam carbon can increase the capture and fixation of free formaldehyde, and can synergistically accelerate the catalytic degradation of formaldehyde with the titanium dioxide. The dicyandiamide formaldehyde polycondensate grafted with castor oil is in-situ polymerized on the surface of the matrix. The castor oil grafting can significantly improve the dicyandiamide formaldehyde polycondensate, significantly increase the molecular weight, and increase the capture capacity.

The invention provides an environment-friendly high polymer material additive as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, the preparation method comprises the following steps: dissolving beta-cyclodextrin into an anhydrous solvent, adding methacryloyl chloride, controlling the molar ratio of methacryloyl chloride to beta-cyclodextrin to be 1: 1, carrying out substitution reaction, then adding excessive acetic anhydride, and carrying out heat preservation reaction to obtain the environment-friendly high polymer material additive. Carrying out acetylation reaction, and purifying to obtain modified beta-cyclodextrin; adding glycidyl methacrylate, ethylene and modified beta-cyclodextrin into a reaction kettle, and carrying out high-pressure free radical polymerization in the presence of an initiator and a chain transfer agent to obtain the environment-friendly high polymer material additive, wherein the mass ratio of the glycidyl methacrylate to the ethylene to the modified beta-cyclodextrin is (4-8): (88-94): (2-4). According to the prepared additive, the processing rheological property and mechanical toughness of a PCR material are improved, meanwhile, the release characteristic of low-volatility organic compounds is considered, and the application requirements of the fields of automobile interiors and high-end packaging are easily met.

The application relates to the technical field of catalysts, and discloses a preparation method of a supported phosphine phenol nickel catalyst with a sulfonate functional group and application of the catalyst in olefin polymerization, wherein a sulfonate group (-SO 3‑ ) is permanently covalently combined on an aromatic ring of a phosphine phenol chelate ligand and is supported on the surface of a solid carrier such as silicon dioxide and magnesium oxide through ionic interaction; in a ligand synthesis stage, the sulfonate group is introduced into a ligand skeleton through a concentrated sulfuric acid sulfonation reaction to prepare a sulfonate-containing phosphine phenol ligand; the ligand is reacted with a nickel source to prepare a complex, and the target catalyst is obtained through supporting; the sulfonate group is fixed through a covalent bond, the structural stability of the catalyst is significantly enhanced, and the loss of an active component in a polymerization process is effectively prevented.

The invention provides a low-precipitation high-transparency high-toughness polyamide material as well as a preparation method and application thereof. The polyamide material comprises polyamide and a specific small molecule capturing agent. According to the low-precipitation, high-transparency and high-toughness polyamide material disclosed by the invention, residual monomers and oligomers of polyamide are reduced in the production process, so that the precipitation resistance problem is obviously improved, the high transparency of the material is maintained, the low-temperature toughness resistance is realized, and the application range in the fields of medium storage and transportation can be widened.

This invention relates to the field of water-soluble polymer materials technology, and discloses a comb-shaped ternary polymer and its preparation process. The polyacrylamide is polymerized from a backbone monomer, anionic monomer, comb-shaped macromolecular monomer, and optional functional reinforcing monomers under the action of a redox and azo-based composite initiation system. The preparation process includes solution preparation and neutralization, deoxygenation and temperature control, adiabatic polymerization, and post-treatment steps, employing a control strategy combining low-temperature initiation and adiabatic temperature rise polymerization. This invention effectively overcomes the defects of traditional linear polymers—low viscosity retention and poor shear resistance—in high-temperature and high-salt environments by introducing comb-shaped side chains to create a steric hindrance effect. The resulting product possesses ultra-high molecular weight, low water-insoluble content, and excellent solubility, exhibiting excellent salt-resistant thickening advantages and mechanical stability, meeting the oil displacement requirements of harsh reservoir environments.

The invention discloses tackifying emulsion as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The tackifying emulsion comprises the following components in percentage by weight: 45-70% of a tackifying polymer D, 0.5-5% of a dispersing agent and the balance of water, wherein the polymer B is prepared from divinyl benzene, phenol and an alpha-methyl styrene oligomer through a reaction, and the polymer C is prepared from triisobutylene and a divinyl ester compound through a reaction. The emulsion provided by the invention has excellent high and low temperature resistance stability, freeze-thaw stability and wide temperature range applicability, and solves the problems of easy phase separation and narrow use temperature range of the traditional petroleum resin tackifying emulsion.

The invention relates to the field of lubricating oil preparation, and discloses PAO base oil and a preparation method thereof. The preparation method comprises the following steps: in the presence of a metallocene catalyst system, carrying out polymerization reaction on a raw material containing alpha-olefin to obtain PAO base oil; wherein the polymerization reaction comprises multi-stage reactions which are sequentially carried out; in the multi-stage reaction, after the last but one stage reaction is finished, the conversion rate of alpha-olefin in the raw materials is 50-70%; the last-stage reaction is carried out in the presence of an oxygen-containing auxiliary agent; the oxygen-containing auxiliary agent is selected from ester compounds and / or ether compounds. The high-viscosity PAO base oil with high molecular weight and narrow molecular weight distribution can be prepared by utilizing the method, the raw material conversion rate and the product yield are high, the viscosity value of the prepared PAO base oil at 100 DEG C is 60-300mm < 2 > / s, the molecular weight distribution is not more than 1.8, the pour point is not higher than-30 DEG C, the conversion rate of alpha-olefin in the raw material is higher than 92%, and the product yield is higher than 91%.

The application provides a heterocyclic quaternary acid and a preparation method and application thereof. The heterocyclic quaternary acid has a structure shown in formula I, wherein Y is selected from a substituted or unsubstituted heterocyclic group, R1 and R2 are independently selected from a linear or branched alkyl group with 1-6 carbon atoms or a substituted or unsubstituted aromatic ring. 10 The heterocyclic quaternary acid has the advantages of good biological compatibility and low toxicity due to the presence of an amide bond, and is suitable for synthesizing a low-toxicity plasticizer.

This invention discloses a method for the continuous preparation of biodegradable copolyester PBST. The method includes: (1) esterifying terephthalic acid and 1,4-butanediol in a stirred vertical esterification reactor; (2) introducing the product of step (1), succinic anhydride, and 1,4-butanediol into the stirred vertical esterification reactor for further esterification; (3) introducing the product of step (2) into a pre-polymerization reactor for pre-polymerization; (4) introducing the product from the pre-polymerization reactor into a final polymerization reactor for final polymerization; and (5) introducing the product from the final polymerization reactor into a melt thickening reactor for melt thickening, so that the melt index of the reaction product reaches 1-20. According to the scheme of this invention, not only can high molecular weight aliphatic aromatic copolyesters be continuously prepared, but the tensile mechanical properties of the prepared PBST are also significantly better.

The application belongs to the field of engineering plastics, and particularly relates to long-chain polyamide resin with easy processing and high tensile property, and a preparation method and application thereof. The long-chain polyamide resin comprises the following raw material components: component a: aliphatic carboxylic acid compound component; component b: polyamine compound component; and component c: a compound with a structure shown in the following formula (1), wherein n and m can be any number between 1 and 10. The long-chain polyamide resin of the application introduces structural diacid with an asymmetric benzene ring structure, utilizes the asymmetric structure to reduce the crystallinity of the material, and introduces the benzene ring structure to improve the mechanical property of the polyamide material, so that the low processing temperature is realized from the polyamide material component itself, the energy consumption is reduced, and the mechanical property of the polyamide material is ensured. The problem that the processing temperature and mechanical property of the polyamide material and the processing energy consumption are difficult to be considered in the prior art is solved.

The application discloses a salt-resistant water-non-dispersible material for oil well cement and a preparation method thereof. The salt-resistant water-non-dispersible material for oil well cement comprises the following components in the form of weight parts: 100 parts of N,N-dimethyl acrylamide, 3-6 parts of acrylic acid, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of a cyclic monomer, 0.1-0.4 parts of a branching agent, 5-15 parts of a cationic monomer, 0.3-3 parts of a crosslinking agent and 400-500 parts of water. The salt-resistant water-non-dispersible material prepared by the application has good salt resistance, can significantly improve the anti-dispersion performance of the cement slurry when used in a salt water and sea water cement slurry system with a NaCl content of 18 wt% or less, and has excellent rheological performance.

This invention provides a method for preparing cyclic polyolefins, belonging to the technical field of preparing cyclic olefin polymers. The method includes: initiating ring-opening metathesis polymerization of cyclic olefin monomers using a catalyst; adding a polar monomer to obtain a mixture of linear block polymers and cyclic polymers; adding a quencher to quench the reaction; and separating to obtain the cyclic polyolefin; wherein the cyclic olefin monomer is selected as C. 5~20 The invention relates to an olefin containing carbon-carbon double bonds; the linear block polymer has polar blocks. By adding a polar monomer with a special structure after the ring-opening metathesis polymerization of a cyclic olefin, the two products can be easily separated in post-processing, yielding the target cyclic polyolefin.