84 results about "Conjugated diene" patented technology

It has been unexpectedly found that certain neodymium catalyst systems can be used to copolymerize isoprene and 1,3-butadiene to produce random isoprene-butadiene copolymer rubbers which are not tapered. These random isoprene-butadiene copolymer rubbers have properties which are beneficial for use in rubber formulations for manufacturing a wide variety of rubber products, such as tires, hoses, conveyor belts, power transmission belts, and shoe soles. These random isoprene-butadiene rubbers are synthesized by copolymerizing (a) isoprene monomer or a substituted isoprene monomer and (b) 1,3-butadiene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by (1) reacting a neodymium carboxylate with an organoaluminum compound in the presence of a conjugated diolefin monomer to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with an alkyl aluminum chloride to produce the neodymium catalyst system.

The application belongs to the technical field of catalytic synthesis, and particularly relates to application of a Lewis acid-base pair in catalyzing polymerization of functionalizable monomers. Common polymerization methods have poor controllability for polymerization of monomers containing polyene groups, alkyne groups and conjugated diene groups, and the molecular weight of the obtained polymer is uncontrollable at low monomer conversion, and the molecular weight distribution is wide, and crosslinking occurs at high monomer conversion. The application utilizes a specific Lewis acid-base pair, and by adjusting the electronic effect and steric hindering effect of the Lewis acid and the Lewis base, active controllable polymerization of the functionalizable monomers can be catalyzed, and a polymer with a clear structure and containing functionalizable sites is obtained, the molecular weight is controllable, the molecular weight distribution is narrow, the end group structure is controllable, the position and density of the functionalizable sites are conveniently adjusted, an efficient platform is provided for post-modification preparation of functional high molecular materials, and functional high molecular materials are prepared by combining click reaction.

A polymerization catalyst composition contains a rare earth element carboxylate, a phosphate ester represented by the following general formula (1):[Formula 1]O═P(OR)3  (1)(wherein Rs are each independently an alkyl group having 5 to 20 carbon atoms), and water.

This application discloses an electrolyte solute, its preparation method, and its application. The electrolyte solute comprises an olefinic cyclohexene carboxylic acid compound obtained by the reaction of conjugated diene carboxylic acids. The conjugated diene carboxylic acid includes at least one compound having the structure shown in Formula III: wherein X and Y are each independently selected from H, -RO-COOH, substituted or unsubstituted C1-10 saturated hydrocarbon groups, etc., and at least one of X and Y is -RO-COOH; RO represents a directly bonded or C1-10 saturated hydrocarbon group. The electrolyte solute of this application, comprising an olefinic cyclohexene carboxylic acid compound with unsaturated hydrocarbon functional groups, can both improve the flash voltage of the electrolyte and maintain low viscosity and high conductivity.

The application discloses a method for synthesizing a chiral secondary phosphine oxide with a conjugated dienyl phosphorus center through desymmetrization. The method is that a primary phosphine oxide reacts with an alkyne to obtain the chiral secondary phosphine oxide with the conjugated dienyl phosphorus center under the joint catalysis of zero-valent nickel and a ligand and the action of an additive. The method realizes the preparation of the chiral secondary phosphine oxide with the conjugated dienyl phosphorus center with high enantioselectivity and specific chemical selectivity through the joint catalysis of the zero-valent nickel and the ligand.

Living polymers prepared by organolithium initiated polymerization of conjugated diene monomer or copolymerization of conjugated diene and vinyl aromatic monomers are efficiently coupled by using a functionalized siloxane oligomer blend as coupling agent. Diene rubber compositions partially coupled with functionalized siloxane oligomer blends exhibit broad molecular weight distribution, increased throughput in their industrial processing, as well as faster dissolution in recipes to produce rubber toughened plastics such as HIPS and ABS. Radial styrene-butadiene block copolymers as well as their corresponding hydrogenated block copolymers achieved excellent thermoplastic elastomer performance and can be used for hotmelt adhesives, sealants, asphalt modification, footwear; technical compounds, thermoplastic gels, films or elastic fibers.

A hydrogenated conjugated diene polymer that satisfies the following conditions (i)-(iii).　Condition (i): The hydrogenated conjugated diene polymer is a random polymer that includes a conjugated diene monomer unit and may include an aromatic vinyl monomer unit, wherein aromatic vinyl monomer blocks are less than 10 mass% of the hydrogenated conjugated diene polymer.　Condition (ii): The weight average molecular weight is 10×104 to 200×104.　Condition (iii): The molecular weight distribution of an ozonolysis product is 2.1 to 6.0.

This invention discloses an ethylene copolymer containing ethylene structural units derived from ethylene, α-olefin structural units derived from α-olefins, and conjugated diene structural units derived from conjugated dienes. The molar ratio of the ethylene structural units to the conjugated diene structural units is 2-10:1. Based on the total amount of the ethylene copolymer, the content of the conjugated diene structural units is 5-20 mol%. The ethylene copolymer also contains anti-1,4-structural units, which are structural units formed by 1,4-polymerization of the conjugated diene and possessing anti-1,4-double bonds. Based on the total amount of the conjugated diene structural units in the ethylene copolymer, the content of the anti-1,4-structural units is 10-50 mol%. The ethylene copolymer according to this invention exhibits good compatibility and co-vulcanization properties. The ethylene copolymer according to this invention has broad application prospects in the rubber industry, particularly in the field of automotive tire rubber.

The present invention relates to a method for manufacturing a rubbery polymer, comprising the step (S10) of polymerizing a conjugated diene monomer to produce a conjugated diene polymer latex containing a conjugated diene polymer, wherein the step (S10) is carried out by including a crosslinking agent represented by Formula 1 (see description of the invention) and a crosslinking agent represented by Formula 2 (see description of the invention). The invention also relates to a rubbery polymer, a graft copolymer, and a resin composition.

The application relates to a perovskite solar cell and a preparation method, a laminated solar cell, an assembly, a system, an electricity-using device and a power generation device. The perovskite solar cell comprises a perovskite light-absorbing layer and an additive, the perovskite light-absorbing layer comprises a tin-containing perovskite material, the additive comprises a vitamin C derivative, and the additive is located in the perovskite light-absorbing layer and / or on the surface of the perovskite light-absorbing layer. By adding the vitamin C derivative as the additive in and / or on the surface of the perovskite light-absorbing layer of the tin-containing perovskite material, the additive has multiple hydroxyl groups in the vitamin C structure and has a conjugated diene alcohol structure unit, has strong reducibility, can effectively reduce Sn 4+ in the perovskite light-absorbing layer to Sn 2+ , reduces defects in the perovskite light-absorbing layer, and improves the stability of the perovskite solar cell.

The present invention aims to provide a rubber composition and a pneumatic tire in which the change in tan delta peak temperature over time is reduced. The present invention relates to a rubber composition comprising at least one copolymer obtained by copolymerizing an aromatic vinyl compound and a conjugated diene compound, the heat aging resistance index defined according to formula (1) of which is 0.45 or less.

This invention relates to the technical field of polymers, and more particularly to an impact-resistant poly(4-methyl-1-pentene) and its preparation method. A method for preparing impact-resistant poly(4-methyl-1-pentene) includes the following steps: first, a polymeric raw material comprising 4-methyl-1-pentene and an α,ω-nonconjugated diene undergoes polymerization reaction 1; then, an α-olefin is added and polymerization reaction 2 is carried out; the mixture is washed and dried to obtain the final product. The insertion of the α-olefin disrupts the crystallinity of part of the polymer, thereby controlling the polymer's crystallinity and imparting impact resistance. The introduction of the α,ω-nonconjugated diene forms a partially cross-linked network in the polymer structure, preventing excessive loss of other mechanical properties of the polymer. The combination of these two monomers improves the impact resistance of the PMP polymer while maintaining its excellent properties.

This invention discloses a chiral monophosphine ligand, its preparation method, and its application in asymmetric synthesis. The ligand preparation method involves mixing an N,N',1,2-tetrasubstituted ethane-1,2-diamine compound, phosphorus trichloride, triethylamine, and solvent under a nitrogen or argon atmosphere at -80 to -70°C, and reacting at 60 to 80°C for 6 to 8 hours. The resulting reaction mixture is then cooled to room temperature, and an alcohol, phenol, or Grignard reagent is added dropwise, reacting at 60 to 80°C for 8 to 12 hours. The resulting mixture is then post-treated to obtain the chiral monophosphine ligand. The application involves stirring a nickel catalyst, a chiral monophosphine ligand, a solvent, a diene, and an aldehyde under an argon or nitrogen atmosphere at a specified temperature for 12 to 15 hours. The mixture is then post-treated to obtain the target product. This method utilizes widely available and inexpensive raw materials, and the operation is simple, achieving high stereoselectivity and enantioselectivity in the synthesis of alcohol compounds containing chiral conjugated dienes through a one-step reaction.

本发明提供一种改性共轭二烯系聚合物，其满足下述＜条件(i)＞～＜条件(iii)＞。＜条件(i)＞基于凝胶渗透色谱(GPC、Gel Permeation Chromatography)的分子量分布曲线具有单峰形，分子量分布(PDI；MWD)为1.7～3.5。＜条件(ii)＞改性率为40质量%以上。＜条件(iii)＞在对通过差示扫描量热(DSC、Differential Scanning Calorimetry)测定所记录的DSC曲线进行微分而得到的DSC微分曲线中，具有2个以上的峰。

MODIFIED CONJUGATED DIENE-BASED POLYMER, METHOD FOR PREPARING THE SAME AND RUBBER COMPOSITION INCLUDING THE SAME. The present invention relates to a modified conjugated diene-based polymer having excellent rolling resistance and improved processability, a method for preparing the same and a rubber composition including the same, and provides a modified conjugated diene-based polymer that includes a repeating unit derived from a conjugated diene-based monomer, and a functional group derived from a modifier, and satisfies conditions (i) to (vii), a method for preparing the same and a rubber composition including the same.

This invention relates to the field of metallocene linear low-density polyethylene (MDPE) preparation technology, and particularly to a method for preparing long-chain branched metallocene polyethylene. The method comprises the following steps: A polymerization reaction is carried out in a high-pressure stainless steel reactor. A metallocene catalyst is added to the reactor with dried alkane, followed by ethylene, comonomers, and hydrogen gas, which is then introduced into the reactor. A mixed solution of dichlorosilane-functionalized non-conjugated α,ω-dienes and white oil is then added to the reactor. After stabilizing the reaction for 12-72 hours, excess steam is introduced for hydrolysis. The mixture is stirred for 1-4 hours and then discharged to obtain long-chain branched metallocene polyethylene. This invention achieves controlled molecular structure with controlled long-chain branching content, resulting in a product with high branching degree, suitable branch length, and uniform distribution. This increases the number of branched active sites and their uniform distribution, leading to excellent mechanical properties and low haze.

A thermoplastic resin composition containing: a thermoplastic resin (L); a paraffin-based hydrocarbon solvent (M); and a styrene-based elastomer (N), wherein the thermoplastic resin (L) is one or more selected from the group consisting of a polycarbonate resin and a resin containing, as structural units, a rubber-based polymer, a vinyl cyanide-based monomer, and an aromatic vinyl-based monomer, the paraffin-based hydrocarbon solvent (M) has an aniline point of 110°C or higher, and the styrene-based elastomer (N) is a block copolymer containing a polymer block having polystyrene and a polymer block having a conjugated diene compound. The thermoplastic resin composition has excellent silent properties while maintaining or improving the low-temperature impact resistance of the thermoplastic resin.

The application provides a preparation method of solution polymerized styrene-butadiene rubber, and the method comprises the following steps: in the presence of a hydrocarbon solvent, an organic lithium is used as an initiator, an ether compound is used as a random aid, an anionic copolymerization reaction of a monovinyl aromatic compound and a conjugated diene compound is carried out, after the monomer conversion rate reaches more than 95%, a mixture of nitrogen-containing star-shaped and linear coupling agents is added, the molar ratio of the two coupling agents is 1:(1.5-15), and then antioxidants, a terminating agent, flocculation, drying and other steps are added to obtain the solution polymerized styrene-butadiene rubber product. The solution polymerized styrene-butadiene rubber with a relatively wide three-peak molecular weight distribution is obtained under the action of the special composite coupling agent, so that the processing performance of the rubber is improved; the rubber matrix after nitrogen functionalization can obviously improve the dispersity of carbon black therein, fully plays the reinforcing role of the carbon black, obviously improves the tensile strength of the rubber compound, and can make the tire simultaneously obtain excellent characteristics of low rolling resistance and high anti-wet skid resistance.

The present invention relates to a highly branched and high molecular weight hydrogenated modified conjugated diene-based polymer, a preparation method therefor and a rubber composition comprising same. Provided are the modified conjugated diene-based polymer, the preparation method therefor and the rubber composition comprising same, the modified conjugated diene-based polymer comprising: a conjugated diene-based monomer-derived unit; and a modified part derived from a compound represented by chemical formula 1, wherein the hydrogenation rate of the conjugated diene-based monomer-derived unit is 40-90 mol%.

The present invention relates to a highly branched, high molecular weight modified conjugated diene-based polymer, a method for preparing same, and a rubber composition comprising same, and provides: a modified conjugated diene-based polymer comprising a unit derived from a conjugated diene-based monomer, a unit derived from a branching agent represented by chemical formula 1, and a modification moiety derived from a compound represented by chemical formula 2; a method for preparing same; and a rubber composition comprising same.

The present invention relates to a highly branched and high molecular weight modified conjugated diene-based polymer, a preparation method therefor and a rubber composition comprising same, and provides a modified conjugated diene-based polymer, a preparation method therefor and a rubber composition comprising same, the modified conjugated diene-based polymer comprising: a conjugated diene-based monomer-derived unit; a branching agent-derived unit represented by chemical formula 1; and a modified part derived from a compound represented by chemical formula 2.

Embodiments of the present disclosure relate to a thermoplastic adhesive composition comprising: at least one maleic anhydride grafted ethylene-based polymer; at least one ethylene / alpha-olefin / non-conjugated diene interpolymer having a molecular weight distribution (MWD) > 2.5, where MWD = Mw / Mn, where Mw is the weight average molecular weight and Mn is the number average molecular weight, both of which are measured by gel permeation chromatography; a very low density polyethylene (VLDPE) having a density in the range of 0.885 to 0.915 g / cm 3 ; and optionally at least one ethylene alkyl (meth)acrylate copolymer, where the alkyl group comprises one to four carbon atoms.

This invention provides a modified glass powder, its preparation method, photovoltaic silver paste, and solar cells. The preparation method of the modified glass powder includes the following steps: S1: Mixing a first solvent, a polymeric monomer, a structure control agent, and an initiator to react and obtain polymer chains; then adding silicon tetrachloride to the reaction solution to end-cap the polymer chains, obtaining a first solution containing functionalized polymer chains; wherein the polymeric monomer includes one or more of styrene monomers, conjugated diene monomers, and vinyl monomers; S2: Mixing a second solvent, silica-containing glass powder, and the first solution to cause the functionalized polymer chains to be branched onto the surface of the glass powder, obtaining modified glass powder. The modified glass powder prepared by this method has better compatibility with the carrier in photovoltaic silver paste, and can reduce the agglomeration of glass powder, resulting in better dispersibility and storage properties.

Provided is a hydrogenated copolymer (X) comprising: a hydrogenated copolymer (A); and a hydrogenated copolymer (B), wherein the hydrogenated copolymer (X) satisfies: (1): the hydrogenated copolymer (A) has a random copolymer structure comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit, and content of the vinyl aromatic monomer unit in (A) is 10 to 80 mass %; (2): the hydrogenated copolymer (B) has a random copolymer structure comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit, and content of the vinyl aromatic monomer unit in (B) is 10 to 80 mass %; (3): a ratio (Mn1 / Mn2) of (Mn1) of the hydrogenated copolymer (A) to (Mn2) of the hydrogenated copolymer (B) is less than 0.25, and 1000≤Mn1≤40000; and (4): a mass ratio (A) / (B) of a content of the hydrogenated copolymer (A) to a content of the hydrogenated copolymer (B) is 5 / 95 to 50 / 50.

This invention discloses a narrow-distribution functionalized aqueous latex and its preparation method, belonging to the field of aqueous latex preparation technology. The latex uses functionalized monomers, aromatic vinyl monomers, and aliphatic conjugated diene monomers as main raw materials, introduces silane coupling agent-modified cellulose nanocrystals, and combines them with an initiator, emulsifier, and water, undergoing one-step emulsion polymerization. The modified cellulose nanocrystals can form a physical barrier on the surface of the latex particles, reducing the content of embedded acid and free acid in the aqueous phase, and increasing the surface carboxyl group density; its rigid structure forms a three-dimensional network after film formation, effectively suppressing the volume expansion of the silicon anode. The resulting latex has a particle size of 245~255nm, a narrow particle size distribution, moderate viscosity, and high bonding strength. When used as a lithium battery anode binder, it exhibits high electrode peel strength, good slurry dispersibility, and excellent battery cycle stability. This invention features a simple process, readily available raw materials, and easy industrial scale-up, making it suitable for lithium battery anode binders, paper coating, and aqueous adhesives.

This laminate comprises a substrate (X) and an adhesive layer (Y) that is adjacent to the substrate (X), wherein the substrate (X) includes rubber, and the adhesive layer (Y) includes a hydrogenated block copolymer (A) obtained by hydrogenating a block copolymer (P) containing a polymer block (a) which contains a structural unit derived from an aromatic vinyl compound and a polymer block (b) which contains a structural unit derived from a conjugated diene compound.

A recycled polymer composition is disclosed comprising: a) 80-99.5 wt. % of a post-consumer recycle polymer comprising a recycled high density polyethylene (PCR-HDPE) and a recycled polypropylene (PCR-PP); b) 0.5-20 wt. % of a styrenic block copolymer (SBC) having a block A derived from a vinyl aromatic monomer and a block B derived from a conjugated diene monomer; and c) 0-10 wt. % of at least an additive, based on total weight of the recycled polymer composition. An article obtained from the recycle polymer composition using extrusion blow molding (EBM) show improved mechanical properties including drop impact resistance and top load strengths.

Provided is a conjugated diene-based polymer, wherein a content of an aromatic vinyl monomer unit is 35% by mass or more and 70% by mass or less, an amount of 1,2-vinyl bond in a conjugated diene monomer unit is 21% by mol or more and 65% by mol or less, (A) a relative intensity at 6.0 ppm or more and less than 6.7 ppm, (B) a relative intensity at 6.7 ppm or more and less than 6.94 ppm, and (C) a relative intensity at 6.94 ppm or more and 7.60 ppm or less in 1H-NMR are (A) 0.5% or more and 25% or less, (B) 2% or more and 25% or less, and (C) 60% or more and 96.5% or less based on 100% in total of (A) + (B) + (C), and a peak top molecular weight of a peak having the largest area in a molecular weight distribution curve in GPC is 150000 or more and 600000 or less.