117 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.

To provide a thermosetting adhesive composition which has, after thermally cured, a low dielectric constant, a low dielectric loss tangent, a low temperature change rate of the dielectric loss tangent, and good bending resistance.SOLUTION: A thermosetting adhesive composition for bonding between substrates is provided, containing with respect to 100 pts.mass of the total of the thermosetting adhesive composition, 65 to 90 pts.mass of a styrenic elastomer, as crosslinking components, 5 to 20 pts.mass of (A) a modified polyphenylene ether resin having a radical polymerizable group at a molecular terminal, 4 to 10 pts.mass of (B) polybutadiene and / or polyisoprene having a weight average molecular weight of 10,000 to 50,000, a radical polymerization initiator, and an epoxy resin, wherein the total of the contents of the radical polymerization initiator, the epoxy resin and the epoxy resin curing agent is 10 pts.mass or less, a styrenic elastomer having a styrene ratio of less than 67% is contained as the styrenic elastomer, and the total of the content of the component (A) and the content of the component (B) is 25 pts.mass or less.SELECTED DRAWING: Figure 1

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 utility model relates to the field of medical supply devices, in particular to a polyisoprene gasket capable of improving the inward sinking risk, which comprises an inner cover wrapped on a bottle opening of a medical bottle and an outer cover tightly attached to the inner cover, and a rubber head convenient for a needle to pierce is arranged at the center position of the outer cover. The rubber head is provided with an anti-sinking assembly matched with the inner cover. The pressing part of the anti-sinking assembly abuts against the inner cover, so that the phenomenon of sinking is effectively improved, meanwhile, a medical medicine bottle does not permeate air, the use safety of medicine is guaranteed, meanwhile, acupuncture is convenient, and the phenomenon of medicine waste is reduced.

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.

A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises insoluble amorphous sulfur extracted with zinc dithiocarbamate catalyst at 20° C. to form sulfur chain and transported to interior of synthetic polyisoprene particle forming physical attachment of sulfur to active sites. The degree of pre-vulcanization is verified by expansion of cast and dried film of latex in toluene in 20 minutes by means of a swelling index test. The latex emulsion is vulcanized at 90° C. to 120° C. for 3 to 5 minutes. Post-vulcanization composition with accelerators crosslink between synthetic polyisoprene particles, uniformly curing both in the inter-particle and intra-particle regions to produce high cross link density, uniform distribution of double bonds with zinc segregation at the boundaries of original particles. The condom exhibits high tensile strength, tensile modulus, elongation with excellent tear strength releasing below 10 ppb of nitrosamines.

The invention relates to a rubber composition having a good performance compromise between elongation at break, tear strength and fatigue resistance. This composition is based on at least one elastomer matrix comprising from 85 to 98 phr of at least one copolymer containing ethylene units and 1,3-diene units, the molar fraction of ethylene units in the copolymer being within a range extending from more than 50% to 95%, and from 2 to 15 phr of a polyisoprene comprising a content by weight of cis-1,4 bonds of at least 90% of the weight of the polyisoprene, a reinforcing filler comprising carbon black having a BET specific surface area within a range extending from 50 to 160 m2 / g, and a crosslinking system. The invention also relates to a tyre comprising this composition.

The application relates to the technical field of high polymer materials, and discloses a PE material containing nano reinforcing material and a preparation method thereof, which comprises the following raw materials: low-density polyethylene, nano reinforcing material, high-temperature-resistant additive component, a compatilizer, a lubricant and an antioxidant; the low-density polyethylene is used as a matrix, the nano reinforcing material is added, nano C60 is grafted with hyperbranched polyester, the compatibility of the nano C60 and the matrix is effectively improved, the agglomeration of the nano C60 in the matrix is avoided, the advantages of the nano C60 are better exerted, and the mechanical properties of the PE material are improved; the high-temperature-resistant additive component is added, the polyisoprene molecular chain with good flexibility is used to disperse and absorb external impact energy, the toughness of the matrix is improved, the diphenyl ether group high-temperature-resistant rigid ring is introduced into the polyisoprene structure, the compatilizer can be reacted with the matrix to be crosslinked in the processing process, and the high-temperature-resistant performance and the toughness of the PE material are further improved.

The present invention provides organic particles with high solvent resistance, which are made from a polymer having a main skeleton of cis-1,4-polyisoprene, a typical example of which is natural rubber. [Solution] A method for producing organic particles includes the steps of dissolving a polymer having cis-1,4-polyisoprene as a main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber having a cyclization rate of 60 to 90%, and suspension polymerizing the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the polymer having cis-1,4-polyisoprene as a main skeleton has a Mooney viscosity [ML(1+4)100°C] specified in JIS K 6300 of 18 to 65, and the vinyl monomer contains a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

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 discloses a vibrating diaphragm for a sound production device, the sound production device and electronic equipment. The vibrating diaphragm comprises a modified polyisoprene rubber layer, the modified polyisoprene rubber layer is prepared from a blending material, and the blending material comprises polyisoprene rubber and a damping modifier; the mass percentage of the polyisoprene rubber in the blended material is greater than or equal to 45%; the damping modifier comprises at least one of a butadiene-acrylonitrile copolymer, a hydrogenated butadiene-acrylonitrile copolymer, an ethylene-vinyl acetate copolymer and an acrylate homopolymer, the modified polyisoprene rubber layer has a first glass transition temperature and a second glass transition temperature, the first glass transition temperature ranges from-70 DEG C to-50 DEG C, and the second glass transition temperature ranges from-70 DEG C to-50 DEG C; the second glass transition temperature is from-40 DEG C to-5 DEG C. The vibrating diaphragm provided by the embodiment of the invention has two glass transition temperature regions within the temperature range of-70 DEG C to 10 DEG C, so that the vibrating diaphragm has good damping performance, the THD of the sound production device is effectively reduced, and the listening yield is improved.

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.

The invention discloses a wrapping film and a processing device thereof, and relates to the technical field of wrapping film processing, the wrapping film is formed by a composition containing polyisoprene, glass fiber, polyvinyl chloride, polyvinyl alcohol, polypropylene, polyethylene glycol terephthalate and polyester fiber, and when the components are processed into the wrapping film, the wrapping film has the advantages that the wrapping film is uniform in particle size distribution; according to the winding film and the processing equipment thereof, mixing processing equipment needs to be used, the mixing processing equipment comprises a bottom plate, the top of the bottom plate is fixedly connected with a mixing box, the top of an inner cavity of the mixing box is fixedly connected with a fixed column, and the outer side of the fixed column is movably sleeved with a rotating column. Raw materials below the inner cavity of the mixing box are pushed into the moving box through the plug block, and then are input into the upper part of the inner cavity of the mixing box through the moving box, so that the raw materials above and below the inner cavity of the mixing box are in contact, and the raw material mixing efficiency is improved.

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 discloses a sealing material and a preparation method thereof, and relates to the technical field of fuel cell production, the sealing material comprises a release layer, a hot melt adhesive layer and a base material layer which are arranged in sequence; the hot melt adhesive layer is prepared from polyisobutene resin, polyisoprene rubber, an oxazoline curing agent, a heat-resistant additive, epoxy POSS (Polyhedral Oligomeric Silsesquioxane), an adhesion promoter and a diluting solvent in a weight ratio of 100: (5-15): (2-6): (3-10): (1-4): (0.5-2): (100-300). A composite system of the oxazoline curing agent and the epoxy POSS is adopted, the reaction with carboxyl is efficient, no by-product is generated, and yellowing of the proton exchange membrane is avoided from the chemical principle; the added fluorene monomer can participate in cross-linking reaction, so that the temperature resistance of the bonding layer can be greatly improved; meanwhile, the adhesion between the olefin resin and the base material can be improved by adding the adhesion promoter of the organic titanate, and the problem that the adhesive layer falls off when the adhesive layer is soaked in acid liquor during production is solved.

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 discloses an ultrathin flexible waterborne polyurethane fingerstall, and relates to the technical field of fingerstalls. The ultrathin flexible waterborne polyurethane fingerstall is prepared from the following raw materials in parts by weight: 91 to 95 parts of waterborne polyurethane latex, 2.3 to 8.5 parts of polyisoprene latex and 0.5 to 1.0 part of organic modified polysiloxane of a waterborne system. According to the technical scheme, the water-based polyurethane latex, the polyisoprene latex and the organic modified polysiloxane of the water-based system are blended according to a specific proportion, so that the material keeps the characteristics of polyurethane and also has excellent flexibility, and the prepared fingerstall is relatively thin in thickness, good in flexibility and good in fitting property.

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.