86 results about "Polyprenol" patented technology

A green and sustainable tire base rubber composition and a preparation method, relating to the technical field of tire production. The composition comprises a tire base. The tire base comprises 100 parts by weight of cis-1,4-polyisoprene, 20-40 parts by weight of bio-based carbon black, 0-20 parts by weight of bio-based silicon, 0-20 parts by weight of a silane coupling agent, 1-3 parts by weight of stearic acid, 2-7 parts by weight of zinc oxide, 0.5-2 parts by weight of a carbon black coupling agent, 1.5-3.5 parts by weight of the antioxidant 6PPD, 0.5-2 parts by weight of the antioxidant TMQ, 1.5-2 parts by weight of oil-extended sulfur powder, and 1.5-3.0 parts by weight of the accelerator CZ. The use of the carbon black coupling agent reduces the heat build-up of a rubber material, however, the Mooney viscosity of the rubber is significantly increased. Once a dedicated process has been used, the viscosity of the rubber material is controlled, and the tanδ value of the heat build-up of the rubber material at 60°C is significantly reduced, so that the rolling resistance of a tire is reduced, and the tire maintains good physical and mechanical properties.

The invention discloses SIS (styrene-isoprene-styrene) containing dynamic reversible bonds and a preparation method thereof, and belongs to the technical field of high polymer materials. The copolymer is prepared through a Diels-Alder reaction with bismaleimide on the basis of a polystyrene construction unit with two tail ends capped with furan and a polyisoprene construction unit module with two tail ends capped with furan. Wherein the DA bond has a thermal reversible characteristic. The furan end-capped building unit module with controllable molecular weight and narrow distribution is prepared, and reversible connection and dissociation of blocks are realized through a modularization strategy. According to the invention, an inverse Diels-Alder reaction can be carried out at 120-140 DEG C, and is dissociated into an original construction unit module, so that the proportion of soft and hard segments of a copolymer is changed by supplementing a specific construction unit feeding amount and carrying out the Diels-Alder reaction again; the SIS has the advantages of being accurate in structure and designable in performance at the same time, flexible regulation and control over the block proportion are achieved through the SIS containing the dynamic reversible bonds, and meanwhile the SIS has wide application prospects in the fields of recyclable adhesives, intelligent packaging, flexible electronics and the like.

The invention belongs to the technical field of nano inorganic filler surface modification, and discloses modified nano calcium carbonate which is prepared by the following steps: reacting a nano calcium carbonate raw material with a compound modifier at 70-80 DEG C, and drying, crushing and grading after the reaction is completed, wherein the compound modifier is composed of a component A and a component B in a molar ratio of 1: (1.2-2.0); the component A is selected from p-sulfo calix [n] arene or salt thereof, and n is an integer from 4 to 8; and the component B is selected from epoxy group modified polyisoprene. According to the present invention, the modification formula of mixing the sulfonic acid calixarene compound and the epoxy group modified polyisoprene is used, the molar ratio of the two components is precisely regulated and controlled, and the exposure ratio of the active hydroxyl group in the system is reasonably controlled, such that the modification formula can be used for the modification of the nano calcium carbonate, the modified nano calcium carbonate can effectively improve the impact strength and thixotropy of the base coat and reduce the viscosity of the base coat, and finally, adaptive balance between the thixotropy and the processing fluidity is achieved.

The invention relates to a rubber composition having improved tear strength. This composition is based on 20 to 50 phr of copolymer containing ethylene units and units of a 1,3-diene of formula CH2═CR—CH═CH2, the symbol R representing a hydrocarbon chain containing 3 to 20 carbon atoms, the ethylene units in the copolymer representing between 50 mol % and 95 mol % of the monomer units of the copolymer; 50 to 80 phr of polyisoprene comprising a content by weight of cis-1,4-bonds of at least 90% of the weight of the polyisoprene; a reinforcing filler; from 0.2 to 0.9 phr of zinc oxide; and a vulcanization system. The invention also relates to rubber articles comprising a composition according to the invention, in particular pneumatic tyres, at least one sidewall of which comprises a composition according to the invention.

The invention provides a preparation method of modified epoxy acrylate resin, which comprises the following steps: (1) mixing epoxy-terminated polyisoprene liquid rubber, unsaturated binary acid and a catalyst A for reaction A, and then adding polyol and a catalyst B for reaction B to obtain a modifier; and (2) mixing epoxy resin, unsaturated monocarboxylic acid, a catalyst A and a polymerization inhibitor for reaction C, then adding the modifier and the cross-linking agent in the step (1), and uniformly mixing to obtain the modified epoxy acrylate resin. The synthetic process is simple, the reaction endpoint is clear, the resin toughness is improved, the resin curing shrinkage rate is reduced, and the wettability with glass fibers is improved.

The present invention provides a damping rubber composition that can form a damping member with excellent damping properties in low-strain areas such as wind sway, while suppressing adhesion to rolls and having good processability. [Solution] The damping rubber composition contains (a) a base rubber, (b) a tackifier, (c) carbon black, (d) an inorganic filler with a particle size of 3 μm or more as measured by the air permeability method, and (e) a fatty acid derivative as a lubricant, wherein the (a) base rubber contains at least one selected from the group consisting of polyisoprene rubber and polybutadiene rubber, and the amount of (b) tackifier is 70 to 110 parts by mass, the amount of (c) carbon black is 100 to 160 parts by mass, the amount of (d) inorganic filler is 5 to 100 parts by mass, and the amount of (e) lubricant is 0.5 to 10 parts by mass per 100 parts by mass of the (a) base rubber.

To provide a pressure-sensitive adhesive composition for a decorative sheet, which is excellent in adhesion to a low-polarity adherend, heat-resistant adhesion, heat-resistant holding power, and transparency / moldability (coating appearance after molding) in decoration of a molded article, and to provide a decorative sheet and a decorative structure.SOLUTION: The problem is solved by a pressure-sensitive adhesive composition for a decorative sheet containing a block copolymer (A) and a tackifier resin (B), the pressure-sensitive adhesive composition containing a styrene-based elastomer (a- 1) having a soft block composed of at least one of polybutadiene and polyisoprene and a hard block composed of a polymer of a vinyl aromatic compound, and the tackifier resin (B) having a softening point of 125 to 200 °C.SELECTED DRAWING: None

1. A method for polymerizing isoprene, the method comprising: (i) providing a dilithium initiator; (ii) introducing the dilithium initiator to isoprene monomers to form a polymerization mixture; and (iii) polymerizing the isoprene monomers to form polyisoprene, wherein the polyisoprene is characterized by a monomodal molecular weight distribution.

This invention relates to the field of shoe sole material technology, specifically disclosing an antibacterial and odor-resistant shoe sole and its preparation method. The shoe sole comprises polyisoprene rubber, styrene-butadiene rubber, cis-butadiene rubber, chitosan-based antibacterial agent, odor-resistant additive, and functional auxiliaries, achieving synergistic effects through specific formulations and processes. The chitosan-based antibacterial agent, with compounds containing quinoline and carbazole structures as its core, enhances the antibacterial effect by inhibiting the expression of bacterial surface proteins. The odor-resistant additive uses highly adsorbent activated carbon, bamboo charcoal, or diatomaceous earth, combined with a foaming and cross-linking system to optimize the shoe sole structure. This invention solves the problems of insufficient antibacterial performance, short-lived odor-resistant effect, and decreased mechanical properties in traditional shoe soles. Through component optimization and process control, it endows the shoe sole with long-lasting antibacterial and odor-resistant functions while maintaining excellent elasticity, abrasion resistance, and lightweight characteristics, making it suitable for footwear products with high hygiene requirements.

The invention discloses a shape memory filter sieve tube thermal expansion composite material and a preparation method thereof. The thermal expansion composite material for the shape memory filter sieve tube comprises the following raw materials in parts by weight: 40-50 parts of polyolefin elastomer POE; 20 to 30 parts of polyethylene; 15 to 20 parts of trans-polyisoprene; 15-25 parts of sodium bicarbonate; 6-8 parts of a foaming agent H; 3-5 parts of zinc oxide; 2-3 parts of stearic acid; 1 to 2 parts of dicumyl peroxide; 5 to 10 parts of polycyclooctene; and 8-15 parts of carbon nanotubes. The raw materials are subjected to high-temperature, mixing and vulcanization treatment to obtain the thermal expansion composite material for the shape memory filter sieve tube. The thermal expansion composite material prepared by the invention has the characteristics of accurate response temperature and smaller pore diameter on the premise of ensuring the porosity, and can realize a higher-precision sand control effect when being used for preparing the sand control expansion screen pipe.

The invention relates to the technical field of rubber, in particular to modified polyisoprene rubber and a preparation method and application thereof.The preparation method at least comprises the following steps that polyisoprene rubber is placed on a roller of an open mill, the roller speed of the open mill is controlled to be 20-60 rpm, the roller distance is 0-3 mm, the roller temperature is controlled to be 40-70 DEG C, mixing is conducted, and the modified polyisoprene rubber is obtained; the molecular weight is reduced by chain scission through a mechanical means, the viscosity of the polyisoprene rubber is reduced, the modified polyisoprene rubber is obtained, the processing performance is improved, and the polyisoprene rubber can be used for preparing cyclized rubber resin for photoresist, so that the polyisoprene rubber has huge development potential in the field of adhesives.

The invention relates to the field of rubber, in particular to a rubber composition and a preparation method thereof. The preparation method of the rubber composition comprises the following steps: mixing the reinforcing material and water to obtain a mixed solution; mixing the mixed solution with a latex solution to obtain a mixture; and feeding the mixture to a spray fluidized bed dryer for spray drying to obtain the rubber composition, the latex solution comprises a natural rubber solution, a polybutadiene emulsion, a polyisoprene emulsion and a styrene butadiene rubber emulsion. The preparation method of the rubber composition is low in energy consumption and environmentally friendly, the filler and the auxiliaries in the obtained rubber composition are evenly dispersed, and meanwhile the rubber composition has the advantages of being good in mechanical property, high in wear resistance, high in wet grip performance, low in rolling resistance, high in safety and low in cost.

The present invention is directed to a rubber composition for a truck tire, the rubber composition comprising 70 phr to 95 phr of polyisoprene, 5 phr to 30 phr of a polybutadiene rubber having a cis content of less than 60% and being functionalized for the coupling to silica, as well as 40 phr to 80 phr of a filler comprising predominantly silica. Furthermore, the present invention is also directed to a tire comprising such a rubber composition and a truck with said tire.

The application provides a kind of mechanical property research method of multi-component road marking material, it is related to road marking material analysis technical field, marking line material includes: acrylic resin 18-24%, pigment is polyisoprene modified titanium dioxide 3-8%, filler is 600 mesh double fly ash 35-50%, 40-80 mesh quartz sand 10-18%, glass bead is 20-80 mesh reflective glass bead 15-25%, organic bentonite 0.1-0.5%, accelerator 0.05-0.2%.The application provides a kind of multiscale synergistic method of molecular dynamics-finite element-experimental verification, realizes the through characterization and parameter inversion from nanoscale to macroscopic mechanical response, can quantitatively guide formula design and reveal micro stress mechanism, significantly reduces the development trial and error cost and cycle, improves the controllability of quality.Meanwhile it can also realize the balanced optimization and on-demand customization of material mechanical index, effectively improve the overall durability, crack resistance, wear resistance and service reliability of road marking, and reduce the life cycle cost.

This invention provides highly solvent-resistant organic particles using polymers with a cis-1,4-polyisoprene core, such as natural rubber. [Solution] A method for producing organic particles comprising the steps of: dissolving a polymer having cis-1,4-polyisoprene as the main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber with a cyclization rate of 60-90%; and suspend polymerization of the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the Mooney viscosity [ML(1+4)100℃] of the polymer having cis-1,4-polyisoprene as the main skeleton is 18-65 as defined in JIS K 6300, and the vinyl monomer includes a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

An object of the present invention is to provide a coated particle for cosmetics having an excellent feeling of use (softness and moist feeling on the skin) and high stability (high hydrophobicity).SOLUTION: Coated particles for cosmetics having a coating layer containing polyisoprene (A) and an ester compound (B) of a saccharide compound in which two or more monosaccharides are bonded and fatty acids having 8 to 28 carbon atoms on at least a part of the surfaces of cellulose particles, wherein the content of the polyisoprene (A) is 0.1% by weight or more and less than 2.0% by weight based on the weight of the cellulose particles, and the BET specific surface area is 0.1 to 60m2 / g.SELECTED DRAWING: None

The invention provides a brominated SIS thermoplastic elastomer and a preparation method thereof.The preparation method comprises the steps that 1, 2, 3-dibromo-1-propylene and styrene are subjected to a block copolymerization reaction, then 4-vinyl benzoic acid is added for an acidification reaction, and a ring opening agent is obtained; step 2, carrying out epoxidation reaction on a polyisoprene chain segment in the SIS thermoplastic elastomer to obtain epoxidized SIS; step 3, carrying out ring-opening reaction on a ring-opening agent and the epoxidized SIS to obtain a brominated SIS thermoplastic elastomer; wherein the mass ratio of the 2, 3-dibromo-1-propylene to the styrene to the 4-vinyl benzoic acid is (85.0 to 90.0): (10.0 to 15.0): (3.0 to 5.0); the molar ratio of the ring-opening agent to the epoxy group in the epoxidized SIS is greater than or equal to 1. Compared with an SIS thermoplastic elastomer, the brominated SIS thermoplastic elastomer obtained by the method disclosed by the invention not only has certain polarity, and the compatibility of the brominated SIS thermoplastic elastomer with other polar resins is improved, so that the peel strength of a subsequently prepared pressure-sensitive adhesive is improved, but also has enough raw rubber tensile strength.

The invention relates to a high cis-1, 4 block copolymer of polybutadiene and polyisoprene and a preparation method of the high cis-1, 4 block copolymer. The present invention provides a vulcanizable composition comprising a rubber component, a filler, and a curing agent wherein the rubber component comprises a block copolymer of polybutadiene and polyisoprene, and wherein the block copolymer has a cis content of at least 90%.

The invention provides a low-temperature-resistant and flame-retardant brominated SIS thermoplastic elastomer and a preparation method thereof.The preparation method comprises the steps that 1, cis-2-methyl-1, 4-dibromo-2-butene and allyl phosphate diester are subjected to a block copolymerization reaction, then 4-vinyl benzoic acid is added for an acidification reaction, and a ring opening agent is obtained; step 2, carrying out epoxidation reaction on a polyisoprene chain segment in the SIS thermoplastic elastomer to obtain epoxidized SIS; step 3, carrying out ring-opening reaction on the ring-opening agent and the epoxidized SIS to obtain a low-temperature-resistant and flame-retardant brominated SIS thermoplastic elastomer; wherein the mass ratio of the cis-2-methyl-1, 4-dibromo-2-butene to the allyl phosphate diester to the 4-vinyl benzoic acid is (30 to 70) to (30 to 40) to (3.0 to 5.0). The SIS thermoplastic elastomer provided by the invention improves the non-polar problem, and has good compatibility with other resins, the peel strength of a pressure-sensitive adhesive prepared from the SIS thermoplastic elastomer is high, and the SIS thermoplastic elastomer provided by the invention has good low temperature resistance and flame retardance.

The invention provides hyaluronic acid and application to polyisoprene condoms, the hyaluronic acid comprises first modified hyaluronic acid and second modified hyaluronic acid which are the same in mass, the first modified hyaluronic acid is first natural hyaluronic acid grafted and modified by adamantyl groups and sulfonic acid groups, and the second modified hyaluronic acid is second natural hyaluronic acid grafted and modified by adamantyl groups and sulfonic acid groups. The second modified hyaluronic acid is second natural hyaluronic acid grafted and modified by adamantyl groups and sulfonic acid groups; wherein the molecular weight of the first natural hyaluronic acid is smaller than that of the second natural hyaluronic acid, and the adamantyl group grafting degree of the first modified hyaluronic acid is larger than that of the second modified hyaluronic acid; the sulfonic acid group grafting degree of the first modified hyaluronic acid is smaller than that of the second modified hyaluronic acid. The hyaluronic acid has good hydrophilicity and moisture retention, the binding force between the hyaluronic acid and the polyisoprene condom is high, and a lubricating layer formed between the hyaluronic acid and the polyisoprene condom is not prone to falling off.

The application discloses a kind of for triangle band compression layer flexing-resistant rubber composition and preparation method thereof.The flexing-resistant rubber composition weight part composition includes: natural rubber 70~80 parts, styrene butadiene rubber 20~25 parts, liquid polyisoprene rubber 10~15 parts, layered inorganic powder 20~25 parts, maleic anhydride polybutadiene 1~2 parts, blue cotton short fiber 5~10 parts, carbon black 50~60 parts, white carbon black 5~10 parts, coupling agent 3~5 parts, tackifier 2~4 parts, plasticizer 2~3 parts, activator 6~8 parts, antioxidant 1.5~2.0 parts, zinc methacrylate 0.5~1 part, accelerator 1~2 parts, sulfur 2.8~3.0 parts.Liquid polyisoprene rubber is used to mechanically shear modification layered inorganic powder, and it has layered slip property when being used in rubber composition, which avoids stress concentration.Collaborate blue cotton short fiber to increase strength, limit rubber molecular chain movement, prevent crack propagation, and improve flexing resistance.

To provide a method for producing trans-polyisoprenoid (trans-1,4-polyisoprene) having a molecular weight of more than 105 in an enzymatically reactive manner.SOLUTION: The present invention provides a method for producing trans-polyisoprenoid, the method comprising a binding step for binding a trans-prenyltransferase (tPT) family protein capable of producing a product having a molecular weight of 104 or more under the condition where the protein is not bound to a lipid membrane to a lipid membrane in vitro.SELECTED DRAWING: None

The invention discloses a brominated SIS thermoplastic elastomer and a preparation method thereof.The preparation method comprises the following steps that 1, allyl halide is subjected to a polymerization reaction, then 4-vinyl benzoic acid is added for an acidification reaction, and a ring-opening agent is obtained; step 2, carrying out epoxidation reaction on a polyisoprene chain segment in the SIS thermoplastic elastomer to obtain epoxidized SIS; and 3, carrying out a ring-opening reaction on the ring-opening agent and the epoxidized SIS to obtain the brominated SIS thermoplastic elastomer. The SIS thermoplastic elastomer improves the non-polarity problem and has good compatibility with other resins, and the pressure-sensitive adhesive prepared from the SIS thermoplastic elastomer has high bonding strength and can meet the requirements of new energy, high-end electronic industry and biomedical treatment on the pressure-sensitive adhesive.

The invention provides a primary brominated SIS thermoplastic elastomer and a preparation method thereof.The preparation method comprises the following steps that 1, cis-2-methyl-1, 4-dibromo-2-butene and p-bromomethyl styrene are subjected to a block copolymerization reaction, then 4-vinyl benzoic acid is added for an acidification reaction, and a ring opening agent is obtained; step 2, carrying out epoxidation reaction on a polyisoprene chain segment in the SIS thermoplastic elastomer to obtain epoxidized SIS; and step 3, carrying out a ring-opening reaction on the ring-opening agent and the epoxidized SIS to obtain the primary brominated SIS thermoplastic elastomer. The SIS thermoplastic elastomer improves the non-polar problem and has good compatibility with other resins, the peel strength of a pressure-sensitive adhesive prepared from the SIS thermoplastic elastomer is high, and the SIS thermoplastic elastomer is stable in bromine structure and good in permanent adhesion and flame retardance; in addition, sufficient raw rubber tensile strength of the SIS thermoplastic elastomer is maintained.

The invention discloses a disposable washing-free patch for male comfort and an auxiliary tool, and relates to the technical field of male comfort equipment, the disposable washing-free patch comprises a solid colloidal silica, the solid colloidal silica serves as a main body carrier, a latex film is made of natural latex or polyisoprene, a lubricant and body fluid can be effectively isolated, and the disposable washing-free patch and the auxiliary tool are convenient to use. The organic silicon gel coating ensures that the product can be firmly attached to the inner wall of the comfort article and is prevented from slipping in use, the PP plastic film ensures the viscidity and sanitation before use, and the main body made of the food-grade solid silica gel is extremely thin and soft, so that the comfort article is not easy to fall off, and the service life of the comfort article is prolonged. By means of the technical scheme, the use comfort and experience of an original product are kept to the maximum extent, the ventilation strip arranged on the edge ingeniously solves the exhaust problem in the installation process, the installation convenience and success rate are remarkably improved, and therefore a convenient solution with the extremely high cost performance can be provided for a user while safety and sanitation are guaranteed.

Described herein are cultured gum base ingredients and methods of producing thereof by plant cell culture, also known as plant cell fermentation. The cultured gum base ingredients described herein may comprise one or more terpenoid compounds, such as triterpenoid acetates and polyisoprene. The method of producing the gum base ingredients comprises culturing in a culture medium of a plurality of plant cells derived from a plant that produces a gum base ingredient.

The invention relates to a rubber composition and a preparation method thereof, belongs to the technical field of rubber, and solves the problem that the existing rubber composition cannot have relatively high aging resistance, low heat generation and fatigue resistance at the same time. The rubber composition comprises the following raw materials in parts by weight: 70-95 parts of rubber, 5-30 parts of trans-polyisoprene, 20-60 parts of a reinforcing filler, 1.5-5 parts of an anti-aging agent, 0-3 parts of a vulcanizing agent, 1-10 parts of an anti-fatigue agent, 0.5-2 parts of a vulcanization accelerator and 2-10 parts of a vulcanization activator, the sum of the parts by weight of the rubber and the trans-polyisoprene is 100; the anti-fatigue agent is a sulfur-containing polymer. The rubber composition prepared by the invention has relatively high thermo-oxidative aging resistance, low heat generation and fatigue resistance at the same time.

This invention discloses a digestion apparatus for determining the content of polyisoprene, comprising a steam generating flask, with a conduit connected to the top of the steam generating flask, and a Claisen inductor connected to the end of the conduit away from the steam generating flask. This digestion apparatus provides a reaction site through the steam generating flask, generating stable steam, which is then provided with a uniform heat source via a heating seat to accelerate sample digestion and prevent localized overheating. The steam is then introduced into the Claisen inductor via the conduit. The Claisen inductor enables multifunctional connections, preventing sample loss, improving reaction efficiency, providing safety protection, preventing harmful gas leakage, improving reaction control precision, and ensuring optimal experimental conditions. The digestion flask provides a sealed, high-temperature and high-pressure resistant reaction environment, promoting the complete decomposition of organic matter in the sample and ensuring reaction uniformity and safety.

The invention discloses a preparation method of a high-performance rubber material for an automobile radial tire and the tire, and relates to the technical field of tire rubber materials, the preparation method comprises the following specific steps: raw material preparation, precursor preparation, graft copolymerization reaction, cross-linking agent mixing and vulcanization cross-linking reaction; controllable graft copolymerization is carried out on bio-based polyisoprene and fluororubber, hydroxyl functional groups are introduced to molecular chains of the fluororubber, the hydroxyl functional groups can optimize interaction between the molecular chains, the interface bonding capacity of a rubber material and a tire framework material is enhanced, and the tire performance is improved. Meanwhile, by introducing the bio-based component, the flexibility of a molecular chain can be adjusted, the overall flexibility of the material is improved, the rubber material can better adapt to deformation of a framework material in the tire using process, the interface separation risk is reduced, the integrity of a tire structure is guaranteed, and the structural stress requirement of a radial tire is met.

The utility model relates to the related technical field of chemical detection, and discloses detection equipment for polyisoprene emulsion production, which comprises a box body, a detection box fixedly connected to the box body, a filling port arranged on the front side of the detection box, a hot air box fixedly connected to the bottom of the detection box, and heat conducting fins fixedly connected to the outer wall of the hot air box. A detachable heating disc is installed on the hot air box, an air outlet hole is formed in the outer wall of the detection box, and an exhaust pipe is fixedly connected between the air outlet hole and the hot air box; according to the utility model, the vortex tube is arranged to compress and distribute heat for air, hot air is used to heat polyisoprene emulsion on the heating disc, and cold air is used to condense and recover evaporated isoprene, so that toxic gas is prevented from being evaporated and dispersed, the safety of the equipment is improved, and the production cost is reduced. Meanwhile, the heating plates can be divided and numbered, and different batches of samples can be injected into different sections, so that the unified detection of a plurality of groups of samples is realized, and the practicability of the equipment is improved.