795 results about "Isoprene" patented technology

The disclosure relates to hydrogen mediated anionically copolymerized conjugated diene vinyl aromatic compositions, copolymers of isoprene and / or butadiene with styrene, and processes and compositions for preparing them.

The invention discloses an antistatic polyisoprene rubber anesthesia air storage bag, and relates to the technical field of anesthesia air storage bags. The antistatic polyisoprene rubber anesthesia air storage bag is prepared from the following raw materials in parts by weight: 100 parts of polyisoprene latex, 0.5 to 2 parts of a stabilizer, 1 to 2 parts of a sodium p-styrenesulfonate aqueous solution, 3 to 6 parts of nano silicon dioxide suspension dispersion liquid, 1 to 2 parts of an anti-aging agent, 0.8 to 2 parts of conductive graphite and 3 to 6 parts of a vulcanization bag, the anti-aging agent is prepared by the following steps: reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with glycerol 1-oleyl ether-d5 to generate an esterification product, epoxidizing the esterification product with hydrogen peroxide and formic acid, and reacting the epoxidized product with N-phenyl-1, 3-phenylenediamine, and has excellent migration resistance. By adding the anti-aging agent into the polyisoprene rubber, the anti-aging capability of the anesthesia air storage bag is improved.

The invention discloses a far-infrared high-transmittance composite material, a preparation method thereof and an optical device, and the far-infrared high-transmittance composite material comprises the following components in parts by weight: 70-99 parts of a polymer matrix; 1-30 parts of an anti-reflection auxiliary agent; the polymer matrix is a sulfur-containing polymer prepared by polymerization reaction of a polymeric monomer and sulfur, and the proportion of carbon-carbon unsaturated bonds is less than 3%; the polymeric monomer is selected from at least one of a vinyl monomer, a propenyl monomer, an acrylic acid monomer, a methacrylic acid monomer, an epoxide monomer, a thiopropyl ring monomer, an alkynyl monomer, a butadiene monomer, an isoprene monomer and a norbornene monomer; the anti-reflection auxiliary agent comprises at least one of nano zinc sulfide, nano zinc selenide, nano calcium fluoride, nano magnesium fluoride and nano magnesium oxide. The composite material and the optical device thereof have high far infrared transmittance and good mechanical properties and processability, and can meet the requirements of various far infrared optical fields.

The invention relates to a fluorine-containing binder for a sulfide all-solid-state battery and a preparation method and application thereof.The binder is formed by copolymerizing isoprene and lithium perfluorovinyl ether sulfonate, specifically, the lithium perfluorovinyl ether sulfonate, a chelating agent, an emulsifying agent, ferrous sulfate, a reducing agent and an acid-base buffering agent are dissolved in water, cooling is conducted in the inert atmosphere, and the fluorine-containing binder for the sulfide all-solid-state battery is obtained. And adding isoprene, an initiator and a molecular weight regulator, and carrying out polymerization reaction to obtain the fluorine-containing binder. The isoprene can enhance the solubility of the lithium perfluorovinyl ether sulfonate fragment in the non-polar solvent, so that the whole polymer is dissolved in the non-polar solvent; the perfluorovinyl ether lithium sulfonate has a large space proportion of fluorocarbon groups, and has a shielding effect on hydrocarbon groups on isoprene, so that the stability of the whole polymer can be improved. The fluorine-containing binder prepared by the preparation method disclosed by the invention is a binder with high elasticity, high ionic conductivity and high stability.

The invention relates to the field of rubber products, and discloses a preparation method of a high-wear-resistance outsole which comprises the following components in parts by mass: 30-50 parts of natural rubber, 15-30 parts of isoprene rubber, 15-30 parts of butadiene rubber, 5-15 parts of styrene-butadiene rubber, 20-50 parts of reinforcing filler, 0.5-5 parts of a dynamic cross-linking agent, 5-15 parts of a plasticizer, 1-3 parts of a vulcanizing agent and 0.5-2 parts of an accelerant. The preparation method comprises the steps of mixing, calendaring forming, vulcanizing and the like, and the dynamic cross-linking agent and the static vulcanizing agent are mixed in stages to ensure the uniformity of a cross-linked network. The rubber outsole has high wear resistance, high fatigue resistance and excellent dynamic stability, and can be widely applied to the field of high-performance sole manufacturing.

The invention discloses a silane-crosslinked low-smoke halogen-free flame-retardant oil-resistant polyolefin cable material and a preparation method thereof. The method comprises the following steps: preparing a bio-based polyesteramide toughening phase which is pre-polymerized by castor oil-based polyamide and poly (butylene adipate-co-terephthalate) and is terminated by itaconic anhydride; the preparation method comprises the following steps: self-assembling phytic acid and melamine to wrap ammonium polyphosphate, so as to prepare supramolecular flame-retardant gel powder; the method comprises the following steps: grafting aramid pulp fibers by using a phosphorus-containing silane coupling agent to prepare a reactive liquid crystal reinforced phase; the preparation method comprises the following steps: blending and banburying the components with a hydrogenated styrene-isoprene-styrene block copolymer, an antioxidant and a peroxide cross-linking agent, carrying out dynamic vulcanization and interface bonding, and carrying out extrusion and electron beam irradiation to finally crosslink. An interpenetrating-topology network structure is formed in the prepared cable material, the crosslinking degree is larger than or equal to 82%, and the cable material is rapid in crosslinking, excellent in oil resistance, low in smoke and free of toxicity and is particularly suitable for super high-rise building hanging cables, deep sea exploration cables and new energy automobile liquid cooling cables.

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 belongs to the technical field of polylactic acid films, and discloses a high-toughness polylactic acid material, a preparation method and a film, the high-toughness polylactic acid material uses raw materials of polylactic acid, a polylactic acid copolymer, hydroxyl-terminated epoxidized trans-1, 4-polyisoprene (HEEUG) and an epoxy group chain extender, has good biodegradability and mechanical properties, is safe and non-toxic, is environment-friendly, and can be used for preparing a high-toughness polylactic acid film. And the processing performance is good. In the melt blending extrusion process, the HEEUG and the polylactic acid are subjected to polycondensation and chain extension reaction, and the compatilizer among the components is increased by the polylactic acid copolymer, so that the strength of the polylactic acid film is jointly improved; by adding the low-molecular-weight HEEUG, the motion ability of PLA molecular chains can be improved, the interchain entanglement effect can be reduced, HEEUG long-chain molecules are uniformly dispersed in a system and serve as a bridge, stress conduction can be well improved, the molecular chains can move more easily, the plasticizing effect is achieved, the PLA molecular chains are easy to orient under the action of force, and the mechanical properties of the PLA are improved. The epoxy group chain extender can promote the molecular chain flexibility effect, and the elongation at break is greatly improved.

The present invention relates to an adhesive composition for a polyester tire cord, a method for preparing a polyester tire cord, and a tire cord comprising the same, according to the present invention, when the polyester tire cord is prepared, the adhesive composition can be used for manufacturing a polyester tire cord, according to the present invention, the binding force between polyester fibers and a first treatment liquid can be increased by treating with the first treatment liquid containing a salt containing an anionic functional group, and then the crosslinking density can be increased by treating with a second treatment liquid containing an isoprene rubber latex, thereby not only having excellent high-temperature adhesive force, but also having excellent water resistance. And no harmful substances are used, so that the environment-friendly property is realized. In addition, uniform adhesion of the processing liquid is achieved by minimizing the influence caused by the external environment, thereby reducing the manufacturing manufacturability and the production cost. The polyester tire cord prepared as above can exhibit high heat-resistant adhesive force, rubber coverage, and excellent heat resistance characteristics.

A tire tread is formed from a vulcanizable rubber composition which includes, expressed by weight per hundred parts of elastomer (phr), 100 phr of an elastomer component, the elastomer component including a polyisoprene rubber and a polydiene rubber in a ratio by weight of at least 1:1, at least 40 phr of a filler component, the filler component comprising carbon black and silica in a ratio, by weight of at least 0.8:1, at least 1 phr of an organosilane coupling agent, at least 1 phr of a hydrocarbon traction resin, a sulfur-based curing agent, and a cure accelerator, the cure accelerator including an ultra-accelerator. The tire tread is suited for use on heavy vehicles, such as trucks and buses.

The invention discloses a recyclable lawn and a preparation method thereof, and belongs to the technical field of artificial turfs. The lawn sequentially comprises artificial grass yarns, a base cloth layer and a back glue layer from top to bottom, the artificial grass yarns and the base cloth layer are made of polyolefin; the back adhesive layer is prepared from the following components in parts by weight: 4 to 8 parts of polyolefin elastomer, 10 to 20 parts of olefin block copolymer, 20 to 30 parts of hydrogenated styrene-butadiene copolymer, 8 to 12 parts of styrene-isoprene copolymer, 10 to 12 parts of butadiene-styrene rubber, 2 to 6 parts of ethylene-acrylic acid copolymer, 15 to 30 parts of plasticizer, 0.1 to 0.4 part of antioxidant, 3 to 6 parts of compatilizer and 2 to 4 parts of modified filler; according to the lawn, the artificial grass yarns, the base cloth layer and the gum layer are similar in component, so that the lawn can be conveniently and integrally recycled subsequently, the utilization rate of the lawn gum is increased, and resource waste is reduced.

PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition excellent in gas barrier properties, compression set resistance, and mechanical properties and also excellent in hardness and shrinkage resistance. SOLUTION: A thermoplastic elastomer composition according to the present invention contains at least (a) an isobutylene-isoprene copolymer rubber, (b) a polypropylene polymer, and (c) an ethylene-α-olefin copolymer and is substantially free of plasticizers and softeners.

The invention discloses high-strength durable pervious concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials in parts by weight: 160 to 220 parts of cement, 1200 to 1600 parts of coarse aggregate, 170 to 230 parts of fine sand, 160 to 200 parts of water, 3 to 4.5 parts of polycarboxylate superplasticizer, 5 to 15 parts of silica fume, 1 to 3 parts of polypropylene fiber, 8 to 12 parts of modified nano cellulose and 5 to 7 parts of flexibilizer, wherein the flexibilizer comprises modified graphene oxide, propylene glycol monomethyl ether and polyisoprene rubber. The interface compatibility is enhanced through the modified nanocellulose, microcracks are reduced, the bonding strength of aggregate and cement is improved, and the compressive strength is improved; the toughening agent component endows the concrete with toughness and durability, the toughening agent component and the toughening agent component have a synergistic effect, and the concrete prepared by mixing the various raw materials has excellent mechanical properties and durability on the basis of good water permeability, and has a wide market application prospect.

The invention relates to a high-temperature-resistant low-compression spinning rubber covered roller and a preparation method thereof.The high-temperature-resistant low-compression spinning rubber covered roller comprises an alloy roller core and a rubber blending material layer, the alloy roller core is wrapped with the rubber blending material layer, and the rubber blending material layer is characterized by comprising, by weight, 50-70 parts of carboxy nitrile rubber; 20 to 30 parts of butyronitrile-isoprene rubber; 10 to 20 parts of phenyl siloxane rubber; 5-10 parts of a nano reinforcing agent; 3 to 10 parts of an antistatic agent; 5-8 parts of zinc oxide; 2-4 parts of an accelerant; 5 parts of titanium dioxide; 1-2 parts of an anti-aging agent; 1-3 parts of a functional auxiliary agent; the antistatic rubber has the advantages that the compression set of the rubber at high temperature is reduced, the antistatic property and the rebound rate of the rubber are improved, the toughness and the hardness are good, serious elasticity attenuation of a rubber roller in the working process is avoided, and the service life of the rubber roller is effectively prolonged.

The present invention relates to a packaged condom comprising a sealed package; and within the package, a condom comprising natural rubber latex and / or synthetic polyisoprene; wherein the condom comprises, on one or more surfaces thereof and in contact with the natural rubber latex and / or synthetic polyisoprene, an aqueous lubricant; wherein the aqueous lubricant comprises: a thickener and 5 wt.% to 30 wt.%, based on the total weight of the aqueous lubricant, of a humectant comprising at least one organic compound selected from the group consisting of glycerol, propylene glycol, polyethylene glycol, and any combination thereof; and one or more sugar alcohols having a molecular weight of from 120 to 10000 g / mol. It also relates to a method for preparing a packaged condom and to the use of an aqueous lubricant to lubricate one or more surfaces of a condom. The condom preferably presents a transparent appearance to the end user.

The invention discloses a composite pipe and a preparation method thereof, and relates to the technical field of water supply pipes. The composite pipe sequentially comprises an outer layer, a middle layer and an inner layer from outside to inside, raw materials of the outer layer comprise polypropylene random copolymer and composite rubber, and the mass ratio of the polypropylene random copolymer to the composite rubber is (3-9): 1; the composite rubber comprises ethylene propylene rubber, isoprene rubber and nano silicon dioxide, the mass ratio of the ethylene propylene rubber to the isoprene rubber in the composite rubber is (2.3-4): 1, and the mass ratio of the nano silicon dioxide to the composite rubber is (2-3): 10; the raw material of the middle layer is a propenyl block copolymer; the raw materials of the inner layer comprise heat-resistant polyethylene and glass fibers. The composite pipe provided by the invention has excellent mechanical strength and impact resistance.

The present disclosure provides a method for producing a polyisoprenoid, which makes it possible to synthesize in vitro a polyisoprenoid having an unprecedented structure, such as a 100% cis-polyisoprenoid or a polyisoprenoid containing an allylic diphosphate derivative as an initiating terminal. The present disclosure relates to a method for producing a polyisoprenoid in vitro, which employs a gene coding for a neryl diphosphate synthase and rubber particles bound to a protein encoded by the gene, or a method for producing a polyisoprenoid, which includes introducing into a plant a vector in which a gene coding for a neryl diphosphate synthase is linked to a promoter having a promoter activity that drives laticifer-specific gene expression to express a protein encoded by the gene specifically in laticifers.

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 present invention belongs to the technical field of rubber production, and particularly relates to a low-temperature-resistant and anti-crystallization cis-polybutadiene rubber composition. The cis-polybutadiene rubber composition comprises the following components: 100 PHR of a composite cis-polybutadiene rubber, 30-70 PHR of a reinforcing agent, 10-40 PHR of a softening agent, 4-6 PHR of zinc oxide, 1-3 PHR of stearic acid, 1-5 PHR of an anti-aging agent, 0.5-3 PHR of sulfur and 0.5-2 PHR of an accelerant, wherein the composite cis-polybutadiene rubber is a copolymerized cis-polybutadiene rubber or a blend of a rare earth cis-polybutadiene rubber and the copolymerized cis-polybutadiene rubber, and the percentage mass content of the copolymerized cis-polybutadiene rubber is 30-100%; the percentage mass content of the copolymerized monomers in the copolymerized cis-polybutadiene rubber is 5-20%, and the copolymerized monomers are isoprene. The present invention provides a low-temperature-resistant and anti-crystallization cis-polybutadiene rubber composition, which not only has a glass transition temperature (the temperature when the loss factor reaches the peak in DMA test) of less than-70 ºC, but still has good elasticity at a temperature of -60ºC, and can extend the low-temperature resistance of an existing rare earth cis-polybutadiene rubber material to a lower temperature by about 35-50 ºC; and the raw materials cost thereof is low.

The invention discloses a preparation method of a star-shaped multi-arm HSD viscosity index improver with a core-shell structure, and the preparation method comprises the following steps: uniformly mixing a non-polar hydrocarbon solvent, isoprene and butadiene, adding a polarity regulator, heating, adding an alkyl lithium initiator, and reacting to obtain a polymer shell; then adding a mixed solution of styrene, a coupling agent and a solvent at one time, and continuously reacting to obtain a star-shaped multi-arm polymer with a core-shell structure; the star-shaped multi-arm polymer with the core-shell structure is directly transferred to a hydrogenation kettle, alcohol termination is not needed, then a hydrogenation catalyst is added, heating is performed, hydrogen is introduced for a hydrogenation reaction, catalyst metal ions are removed, a solution is flocculated and dried, and the star-shaped multi-arm HSD viscosity index improver with the core-shell structure is obtained. According to the star-shaped multi-arm HSD viscosity index improver with the core-shell structure, on the premise that the shearing stability of an oil product is kept, the oil product has higher thickening capacity, and the development requirements of high-end oil products and long-life oil products are met.

The invention discloses a hot-melt loxoprofen sodium patch and a preparation method thereof, the hot-melt loxoprofen sodium patch comprises a backing layer, an adhesion layer and a protective layer, the adhesion layer comprises the following components in percentage by weight: 5-6% of loxoprofen sodium or its hydrate, 19-26% of styrene-isoprene-styrene block copolymer, 5-15% of polyisobutene, 5-15% of hydrogenated rosin glyceride and 40-50% of liquid paraffin; by optimizing the model and dosage of the styrene-isoprene-styrene block copolymer and the polyisobutene, the adhesive force and cohesive force of the loxoprofen sodium patch are improved at the same time through the combined action, and the long-term stability can be kept.

The invention discloses a rubber compound for manufacturing a medical sealing element and a preparation method of the rubber compound, and relates to the technical field of rubber. The rubber compound for manufacturing the medical sealing element is prepared by mixing the rubber composition, the composite modifier and the like; the rubber composition comprises chlorinated polyethylene rubber, isoprene rubber and modified liquid fluororubber, and the modified liquid fluororubber is prepared by reacting carboxyl-terminated liquid fluororubber with an isocyanate-terminated epoxy prepolymer. The isocyanate-terminated epoxy prepolymer is prepared by reacting resorcinol diglycidyl ether, N-methylethanolamine and an isocyanate polymer, and the isocyanate polymer is prepared by polymerizing hexamethylene diisocyanate, so that the chemical corrosion resistance and high temperature resistance of the rubber are enhanced; and the composite modifier is prepared by reacting multi-element copolyether ester with fluorinated polybutadiene, so that the final rubber compound has excellent low-temperature brittleness resistance and long-term stability while keeping high strength.

To provide a hair washing agent composition which is superior in foam richness and foaming ability, and which also delivers superior smoothness and manageability of hair after washing and drying.SOLUTION: Provided is a hair washing agent composition comprising: (A) an anionic surfactant and / or an amphoteric surfactant; (B) a cationic polysaccharide; (C) an anionic polysaccharide; and (D) isoprene glycol.SELECTED DRAWING: None

The invention belongs to the technical field of microorganisms and fermentation engineering, and particularly relates to yarrowia lipolytica engineering bacteria for producing isopentene aromatic compounds as well as a construction method and application of the yarrowia lipolytica engineering bacteria. Specifically, synthesis of two precursors of p-coumaric acid and dimethyl aryl pyrophosphate is engineered in parallel in two haploid yarrowia lipolytica strains. And then mating the receptor strain with the donor strain to construct the diploid capable of efficiently synthesizing the drpanin and the artepillin C. The invention further discloses a preparation method of the diploid of the drpanin and the artepillin C. By using a similar method, a strain capable of producing the 8-prenylnaringenin is also constructed. According to the present invention, the basis is provided for the sustainable production of drpanin, artepillin C and 8-prenylnaringenin, and the new way is provided for the rapid engineering of the yeast to produce other isopentenylated compounds.

The invention relates to the technical field of coatings, and particularly discloses a low-temperature-resistant waterproof coating for an outer wall of a house building and a preparation process of the low-temperature-resistant waterproof coating. The water-based paint is prepared from the following raw materials in parts by mass: 200 to 250 parts of modified silicone acrylic emulsion, 75 to 125 parts of polyurethane-acrylate core-shell emulsion, 40 to 60 parts of polyether polyol modified nano filler, 15 to 25 parts of rubber nano powder, 10 to 20 parts of liquid polyisoprene, 22 to 34 parts of an auxiliary agent and 60 to 100 parts of a composite solvent. According to the low-temperature-resistant waterproof coating prepared by the invention, the elongation at break and the low-temperature bending resistance of a coating film are remarkably improved on the premise of keeping relatively good tensile strength and adhesive force.

The invention relates to the technical field of furniture protective films, in particular to a self-adhesive furniture skin-touch protective film which sequentially comprises an organic silicon release film from bottom to top, the organic silicon release film comprises a base material and a coating, the base material is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers, and the coating is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers. The coating is an organic silicon release agent coated on the base material, and the coating weight of the organic silicon release agent is 0.8-1.2 g / m; the pressure-sensitive adhesive layer comprises 60 to 70 weight percent of a compound system of a saturated hydrocarbon block copolymer and a hydrogenated styrene isoprene styrene block copolymer; 25 to 35 wt% of hydrogenated C9 petroleum resin; 3 to 5 weight percent of temperature-sensitive microcapsules; and 2 to 5 wt% of naphthenic oil. According to the invention, through the cooperation of innovative multi-layer structures, the product can maintain excellent comprehensive performance under different parameter configurations, and multiple requirements of the furniture protective film on easy construction, high transparency, strong protection, good touch feeling and aging resistance are met.

The invention relates to the field of cosmetics, and particularly discloses a novel magical color magnetic plane water-gloss cream and a preparation method thereof.The novel magical color magnetic plane water-gloss cream is prepared from, by weight, 20%-60% of hydrogenated polyisobutene, 10%-55% of isononyl isononanoate, 1%-15% of styrene / isoprene copolymer, 0.1%-8% of dextrin palmitate, 0.2%-16% of film-forming agent, 0.01%-0.5% of antioxidant, 0.1%-1% of preservative and 0.01%-10% of magnetic pearling agent. And 0.35-13% of a humectant. A wax-free formula is adopted, a transparent raw material is used as a basis, a magnetic pearling agent with magnetic attraction force is matched, filling can be carried out through a mold with a magnet, magnetic pearling agent particles are induced to be directionally arranged, formed patterns can be not limited according to mold modeling, a common filling machine is adopted as filling equipment, and products with uniform formula, color and pattern lines can be obtained. And the formula paste is transparent and stable, and has good skin feeling and makeup effect.

The invention relates to the field of medical rubber, in particular to a high-performance syringe rubber protective cap and a preparation method of the high-performance syringe rubber protective cap. The rubber material is prepared from the following components in parts by weight: 100 to 150 parts of modified polyisoprene, 5 to 10 parts of alkaline white carbon black, 30 to 50 parts of calcined kaolin, 1 to 2 parts of peroxide, 0.2 to 0.5 part of vulcanization accelerator, 1 to 3 parts of stearic acid, 5 to 15 parts of ultrahigh molecular weight polyethylene powder, 1 to 2 parts of carbon black and 5 to 10 parts of dimethyl silicone oil. The syringe rubber protective cap prepared by the invention has excellent puncture resistance, air tightness and environmental protection property, and does not easily generate adverse reaction with compound medicines.

The invention relates to the technical field of high polymer material and automobile part manufacturing, and discloses a high-durability high-low temperature resistant automobile composite sealing strip, which is prepared from the following raw materials: ethylene propylene diene monomer, polyisoprene grafted maleic anhydride, pre-dispersed master batch, carbon black and a vulcanization system. The pre-dispersed master batch takes oxidized polyethlene wax as a carrier to wrap zinc oxide and D-mannitol. The phase change characteristic of the carrier is utilized, active components are isolated in the mixing and extruding stage, and scorching is prevented; the components are released in the high-temperature vulcanization stage to initiate anhydride ring opening, and a double cross-linked network with coexistence of covalent bonds and ionic bonds is constructed. According to the sealing strip, the macromolecular reactive plasticizer is used for replacing part of liquid paraffin, the atomization problem caused by micromolecule migration is solved, the high-temperature compression permanent deformation rate is remarkably reduced through a thermal reversible mechanism of an ion cluster, and excellent low-temperature rebound resilience and processing safety are both considered.