56 results about "Dibasic ester" patented technology

The present invention discloses a furandicarboxylate bio-based crosslinkable elastomer and a preparation method thereof. The preparation method comprises: uniformly mixing furandicarboxylate or furandicarboxylate, a linear saturated dibasic acid or linear saturated dibasic acid ester, a linear unsaturated dibasic acid or linear unsaturated dibasic acid ester, and a diol; adding a catalyst and an antioxidant; heating the mixture to above 150°C; gradually heating the mixture under an inert atmosphere; and reacting the mixture at 150-190°C for 3-7 hours to obtain an intermediate product; stirring the intermediate product for a polycondensation reaction at a vacuum degree of 30-400 Pa and a temperature of 200-260°C for 3-8 hours to obtain a crude product; and dissolving, washing, and drying the crude product to obtain a finished product. The polyfurandicarboxylate bio-based elastomer prepared by the present invention has good mechanical properties and processing properties; and the composite material after crosslinking and filler reinforcement can greatly improve tensile strength, good resilience, low permanent deformation, and high tensile strength.

A hard surface cleaning composition comprising: (a) 0.1 to 60 wt % of a surfactant system; (b) 0.1 to 40 wt % of a solvent, wherein the solvent is selected from the group consisting of a lower alkanol, a benzyl alcohol, a lower alkyl ether, a glycol, an aryl glycol ether, a lower alkyl glycol ether, a glycerol ketal, an ester, a hydrocarbon / ester blend, a dibasic ester, a linear alcohol ethoxylate, a branched alcohol, oxo alcohol ethoxylate, and combinations thereof; and (c) optionally 0.001 to 10 wt % of a lipase.

The application discloses an electronic skin-oriented conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printed electronic materials.The raw materials of the electronic skin-oriented conductive silver paste include flaky silver powder, silver nanoparticles, thermoplastic polyurethane elastomer, acrylic elastomer, PEDOT:PSS microgel dispersion, (3-glycidylpropoxy)trimethoxysilane, polydiallyldimethylammonium chloride, hexanedial modified dopamine copolymer, (3-aminopropyl)triethoxysilane, methacryloyloxypropyltrimethoxysilane, cellulose acetate, modified polyurea thixotropic agent, hydrogenated castor oil, ethylene glycol ether acetate, dibasic acid ester, leveling agent and water.The electronic skin-oriented conductive silver paste has the advantages of good electrical performance, good mechanical-electrical stability, good anti-electromigration and sweat corrosion resistance, and can still maintain dendrite-free and low drift under long-term coupling of sweat and bias, and is suitable for electronic skin.

The invention discloses a preparation method of heat-resistant bisphenol A type copolycarbonate, and belongs to the technical field of polycarbonate synthesis. Comprising the following steps: by taking bisphenol A and diester carbonate as monomers, aromatic dibasic acid, aromatic dibasic acid ester or aromatic dihydroxy compound as a copolymerization unit and imidazole ionic liquid as a catalyst, carrying out transesterification under a protective atmosphere, and then carrying out condensation polymerization under a vacuum condition to obtain the heat-resistant bisphenol A type copolycarbonate. A metal-free catalyst is used for carrying out melt polycondensation on bisphenol A type copolycarbonate, so that efficient polymerization and heat-resistant modification of polycarbonate are realized. The performance of the copolycarbonate is regulated and controlled by controlling the type and proportion of the added copolymerization units, so that the glass-transition temperature is increased while the mechanical properties and optical properties of the bisphenol A polycarbonate are retained.

A ceramic scintillator array 1 according to an embodiment of the present invention is provided with a plurality of scintillator segments 2 and a reflective layer. The reflective layer contains a resin composition. The resin composition contains a transparent resin and an additive. Dibasic acid esters serve as the additive.

The present invention relates to the technical field of dibasic ester preparation, and particularly to a dibasic ester esterification preparation device and method. A steam recovery pipe is connected to the kettle top of an esterification kettle. In an initial state, a sealing plate closes a sample outlet. When sampling is required, the sealing plate is rotated toward the inside of a transverse tube portion until one side of the sealing plate faces the steam outlet direction in the transverse tube portion. The slides on the sealing plates on both sides abut against each other to make the slides elastically retracted, driving the arc-shaped end plates to slide out along the arc-shaped end surfaces of the sealing plates. At this time, the arc-shaped end surfaces on one side of the sealing plates and the extended and slid-out arc-shaped end plates are used to guide the steam outlet in the transverse tube portion toward the sample outlet, so that the steam outlet can be efficiently guided to the sample outlet. By detecting the water content of the steam outlet in the sampling tube, the corresponding steam outlet channel is triggered to be connected. Compared with the existing method of uniformly collecting and re-distilling the evaporated hydrated methanol, the segmented collection and corresponding segmented recycling in different ways are more efficient.

The invention belongs to the technical field of electronic paste, and particularly relates to silver-nickel paste for a radio frequency identification antenna and a preparation method of the silver-nickel paste. The silver-nickel paste comprises the following components in percentage by mass: 50-60% of conductive metal powder, 5-20% of polymer resin and a solvent, the conductive metal powder comprises first-stage powder, second-stage powder and third-stage powder, the particle size D50 of the first-stage powder, the particle size D50 of the second-stage powder and the particle size D50 of the third-stage powder are decreased step by step, the first-stage powder is nickel powder, and the second-stage powder and the third-stage powder are silver powder; the conductive metal powder comprises nickel powder and silver powder; the macromolecular resin comprises vinyl chloride-vinyl acetate resin and polyester resin; the solvent is dibasic acid ester. The silver-nickel paste capable of replacing pure silver conductive paste is firstly provided, on one hand, the material cost of the radio frequency identification antenna printing paste is reduced, and on the other hand, the particle size design and metal model selection are combined to optimize the conductive performance after nickel replacement.

The invention discloses high-viscosity low-pour-point wind driven generator gear oil and a preparation method thereof, and relates to the technical field of lubricating oil, a composition of metallocene poly-alpha-olefin and dibasic acid ester is used as base oil, and an anti-wear reagent at extreme pressure, a purification dispersant, an antioxidant, a corrosion inhibitor and an anti-foaming agent are supplemented to prepare the high-viscosity low-pour-point wind driven generator gear oil. The prepared gear oil has excellent viscosity-temperature properties, low-temperature fluidity, oxidation stability, detergency and dispersibility, corrosion resistance, load resistance, foam resistance and the like, can meet the use requirements of wind driven generators, and can also be used as lubricating oil to be applied to other mechanical equipment.

The invention relates to the technical field of foam materials, in particular to an interpenetrating network cross-linked polyvinyl chloride foam material and a preparation method thereof. Comprising the following components in parts by weight: 60-70 parts of polyvinyl chloride resin, 3-7 parts of dibasic acid ester, 30-40 parts of isocyanate, 5-10 parts of a physical foaming agent, 1.5-3 parts of water, 1-3 parts of a nucleating agent, 0.1-0.3 part of a foam stabilizer, 0.5-1 part of a catalyst, 0-10 parts of hollow glass microspheres and 0.5-5 parts of a processing aid, the physical foaming agent is supercritical gas, and the air pressure is 8.5-15 MPa. The one-step mould pressing supercritical foaming process is adopted, the process is simple, the step that a foaming blank is prefabricated firstly and then cross-linked and foamed in a water area or a steam area in conventional mould pressing chemical foaming can be effectively avoided, the foaming time is short, the yield is large, and the production cost is relatively low.

The invention discloses a high-temperature-resistant release film for heat transfer printing and a preparation method of the high-temperature-resistant release film, and relates to the technical field of high polymer materials. When the high-temperature-resistant release film for heat transfer printing is prepared, bipyridyl phenazinone and ethyl chloroacetate react to prepare pyridine cation-based phenazinone dibasic ester; the preparation method comprises the following steps: reacting tetrapod-like zinc oxide whiskers with trimethoxysilylmercaptopropyl silane to prepare sulfydryl modified zinc oxide; reacting the sulfydryl modified zinc oxide with a coumarin derivative to prepare modified zinc oxide; terephthalic acid, ethylene glycol, 1, 6-hexanediol, pyridine cation-based phenazinone dibasic ester, dihydroxy DOPO and modified zinc oxide are subjected to a reaction and polycondensation, and then pelletizing, extrusion and stretching film forming are performed to prepare a modified polyester film; and coating the modified polyester film with the release agent to prepare the high-temperature-resistant release film for heat transfer printing. The high-temperature-resistant release film for heat transfer printing has the advantages of aging resistance, high temperature resistance, flame retardance, static resistance and good tensile strength.

The invention relates to a polyester material, a preparation method thereof and an antibacterial product. The polyester material comprises a polyester main chain and antibacterial peptide; the polyester main chain is prepared from the following raw materials: dibasic acid and / or dibasic ester and dihydric alcohol; the dibasic acid comprises terephthalic acid, and the dibasic ester comprises terephthalic acid ester; the antibacterial peptide is prepared through a ring-opening polymerization reaction of amino-acid ester-N-carboxy anhydride. According to the polyester material, the heat resistance and the optical performance are further improved while good antibacterial performance is achieved.

An apparatus for one-step oxidation of cyclohexane to generate alcohol-ketone dicarboxylate esters, comprising at least one reactor, a first washing tower and a second washing tower. A washing chamber is provided at the top of the reactor, and an oxygen source distributor is provided at the bottom. A first feed inlet is provided at the bottom of the reactor, and an overflow port is provided on the side wall. A second feed inlet is provided in the washing chamber, and an exhaust port is provided at the top. A first air inlet is provided at the lower part of the side wall of the first washing tower, and a first washing liquid inlet is provided at the upper part of the side wall. A second air inlet is provided at the lower part of the side wall of the second washing tower, and a second washing liquid inlet is provided at the upper part of the side wall. The first feed inlet and the second feed inlet of the reaction tower are both connected to a cyclohexane source, the exhaust port is connected to the first air inlet, the first washing liquid inlet is connected to a desalinated water source and a liquid caustic source, the second air inlet is connected to the top of the first washing tower through a pipeline, and the second washing liquid inlet is connected to an alcohol-ketone source. The structure of the present invention is simple and convenient for maintenance, and on the basis of ensuring long-term normal and stable operation, environmental pollution can be effectively avoided.

An EPDM composition that is a rubber composition in which ethylene-propylene-diene terpolymer rubber is compounded with carbon black, a plasticizer, and a crosslinking agent, wherein the plasticizer is a polyol ester, which is a reaction product of a neopentyl type polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5 to 22 wt. %. The EPDM composition has excellent effects that kneadability and processability are not impaired, and that in terms of hardness changes after a heat aging test, the resulting crosslinked product is equivalent to when the same amount of an α-olefin oligomer is compounded, and is significantly improved compared to when an aliphatic dibasic acid ester is compounded.

The present invention relates to a method for producing antibacterial polyester, an antibacterial fiber obtained by the method, and the application of the antibacterial fiber in the production of medical and surgical products. The present invention primarily addresses the drawbacks of existing antibacterial polyester fibers, such as poor washability and antibacterial performance. The present invention includes the steps of (i) esterifying a diol with a dibasic acid to obtain ester I, (ii) mixing ester I with a reactive antibacterial component and conducting a pre-polycondensation reaction to obtain a pre-polycondensation product, and (iii) conducting a final polycondensation reaction of the pre-polycondensation product to obtain an antibacterial polyester. The reactive antibacterial component is obtained by esterifying a substance represented by the following formula 3 with a diol. Q is a quaternary ammonium group containing a long-chain hydrocarbon group, the long-chain hydrocarbon group having 6 to 20 carbon atoms, and Ar is an aromatic ring. [Formula 1] JPEG2025538019000015.jpg26170

An EPDM composition, which is a rubber composition prepared by compounding carbon black, a plasticizer and a crosslinking agent in ethylene-propylene-diene terpolymer rubber. Among them, the plasticizer is a polyol ester, which is a reaction product of a neopentyl-type polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5% to 22% by weight. This EPDM composition does not impair the kneadability and processability, and the hardness change of the obtained crosslinked product after the heat aging test is at the same level as that in the case of compounding the same number of parts of α-olefin oligomer, and is greatly improved compared with the case of compounding an aliphatic dibasic acid ester.

The invention provides a moisture absorption and sweat releasing antistatic finishing agent and a preparation method thereof. The antistatic finishing agent is prepared from the following raw materials: 80 to 100 parts of dibasic acid ester, 80 to 100 parts of dihydric alcohol, 24 to 30 parts of lactam monomer, 40 to 50 parts of polyethylene glycol, 0.5 to 1 part of catalyst, 8 to 15 parts of polyether-siloxane-ionic liquid terpolymer, 3 to 6 parts of graphene-zinc oxide-sodium bentonite composite powder, 3 to 8 parts of functional filler, 1 to 3 parts of dispersing aid, 0.1 to 0.3 part of defoaming agent, 0.2 to 0.5 part of antioxidant and 2 to 5 parts of coalescing agent. The moisture-absorbing and sweat-releasing antistatic finishing agent can endow the fabric with excellent moisture-absorbing and sweat-releasing properties, lasting antistatic property and washability, has an antibacterial effect, can improve the hand feeling and air permeability of the fabric, and is good in self stability.

The invention belongs to the technical field of polyester copolymerization modification, and relates to a preparation method of block polyester-polycarbonate, which comprises the following steps: by taking dimethyl carbonate and dihydric alcohol as raw materials, and dihydric alcohol and dibasic acid dimethyl ester or dibasic acid as raw materials, sequentially performing esterification and pre-polycondensation reaction under the action of a catalyst, thereby obtaining the block polyester-polycarbonate. The preparation method comprises the following steps: respectively obtaining a carbonic acid ester with a methoxy end group and a dibasic acid ester with a hydroxyl end group, mixing the carbonic acid ester with the methoxy end group and the dibasic acid ester with the hydroxyl end group, and carrying out final polycondensation reaction under a negative pressure condition to prepare block polyester-polycarbonate; the number-average molecular weight of the carbonate ester with the end group being methoxyl is 430-4000 g / mol; and the difference between the number-average molecular weight of the carbonate chain segment in the block polyester-polycarbonate and the number-average molecular weight of the carbonate ester with the end group being methoxyl is less than 5%. The preparation method is simple and easy to implement, and the obtained block polyester-polycarbonate is excellent in thermal performance and mechanical performance.

The application discloses an environmentally-friendly low-odor stretchable conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printed electronic materials.The raw materials of the environmentally-friendly low-odor stretchable conductive silver paste include flaky silver powder, silver nanoparticles, a bio-based polyurethane, an acrylic elastomer, PEDOT:PSS microgel, a sulfobetaine-silane copolymer, polyquaternium-10, 1,2,4-triazole or a derivative thereof, cellulose ester, fumed silica, ethylene glycol ethyl ether acetate, dibasic acid ester, a leveling agent and water.The environmentally-friendly low-odor stretchable conductive silver paste has the advantages of low VOC emission, low odor, good skin compatibility and good chemical stability, and can still maintain dendrite-free and low drift under long-term coupling of sweat and bias voltage;the paste can be densified at a low resistance at 130 DEG C for 30 min, is friendly to printing and is suitable for roll-to-roll large-area manufacturing.

The invention discloses a modified montmorillonite-based lubricant and a preparation method thereof, and belongs to the technical field of lubricants, oleic acid and diethylenetriamine are cyclized and quaternized to prepare an oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor, the oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor is used for organic modification of nano montmorillonite, a silane coupling agent is further adopted for silanization treatment, and the modified montmorillonite-based lubricant is prepared. The preparation method comprises the following steps: preparing silane modified corrosion-inhibition montmorillonite, carrying out in-situ polymerization coating by taking a urea-formaldehyde prepolymer as a wall material to form montmorillonite modified corrosion-inhibition microcapsules, and carrying out copolymerization on acrylic acid, N, N-bis (2-hydroxyethyl) aminomethylene diethyl phosphonate and trifluoromethacrylate to obtain the modified polyacrylate dispersant with heat-resistant and dispersion-stable functions. The microcapsule, a dispersing agent, dibasic acid ester oil, PAO base oil and an antioxidant are compounded in proportion to form the modified montmorillonite-based lubricant.

The invention discloses conductive silver paste for electronic skin as well as a preparation method and application of the conductive silver paste, and relates to the technical field of flexible printing electronic materials. The conductive silver paste for the electronic skin comprises the following raw materials: flake silver powder, silver nanoparticles, a thermoplastic polyurethane elastomer, an acrylic elastomer, a PEDOT: PSS microgel dispersion, (3-glycidyl propoxy) trimethoxysilane, poly (diallyldimethylammonium chloride), an adipic dialdehyde modified dopamine copolymer, (3-aminopropyl) triethoxysilane, a crosslinking agent, a coupling agent and a solvent. The coating is prepared from methyl acryloyloxy propyl trimethoxy silane, cellulose acetate, a modified polyurea thixotropic agent, hydrogenated castor oil, ethylene glycol monoethyl ether acetate, dibasic acid ester, a flatting agent and water. The conductive silver paste for the electronic skin has the advantages of being good in electrical property, mechanical-electrical stability, electromigration resistance and sweat corrosion resistance, can still keep no dendrite and low drift under long-term coupling of sweat and bias voltage, and is suitable for the electronic skin.

The present application belongs to the technical field of polyester copolymerization modification, and relates to a preparation method of block polyester-polycarbonate. Dimethyl carbonate and dihydric alcohol are used as raw materials, and dihydric alcohol and dimethyl dicarboxylate or dicarboxylic acid are used as raw materials. Under the action of a catalyst, esterification and pre-polycondensation reactions are sequentially performed to obtain carbonate esterification products with methoxy end groups and dicarboxylic acid esterification products with hydroxyl end groups, respectively. The carbonate esterification products with methoxy end groups and the hydroxyl-terminated dicarboxylic acid esterification products are mixed and subjected to final polycondensation reaction under negative pressure to obtain block polyester-polycarbonate. The number average molecular weight of the carbonate esterification products with methoxy end groups is 430-4000 g / mol. The number average molecular weight of the carbonate segment in the block polyester-polycarbonate and the number average molecular weight of the carbonate esterification products with methoxy end groups differ by less than 5%. The preparation method is simple and easy to implement, and the obtained block polyester-polycarbonate has excellent thermal and mechanical properties.

The primer composition comprises a polyacrylate dissolved or dispersed in water. The polyacrylate comprises at least 20% by weight of methyl methacrylate units, at least 15% by weight of monomer units comprising at least one of secondary amines, tertiary amines, or tertiary amides, at least 15% by weight of acrylic monomer units comprising an alkyl group having at least four carbon atoms, and 2.5% to 10% by weight of acrylic monomer units comprising a carboxylic acid group. The primer composition comprises a polymer dispersed in water and a solvent, wherein water accounts for 50% by weight or more of the primer composition, and the solvent comprises at least one of propylene carbonate, polyol, polyol ether, polyol ether ester, or dibasic acid ester. The adhesive system comprises the primer composition and an adhesive tape. Furthermore, a method for producing the bonded article is also described.

The invention discloses a method for preparing ultra-high molecular weight polyethylene, which comprises the following steps: ethylene or ethylene and a small amount of other olefins are used as raw materials to prepare the ultra-high molecular weight polyethylene through polymerization reaction, and a solid catalyst containing magnesium, titanium, halogen and an electron donor and a cocatalyst are used in the polymerization process. Or in the polymerization process, a solid catalyst which adopts alpha-olefin prepolymerization and contains magnesium, titanium, halogen and an electron donor and a co-catalyst are used, and the electron donor is selected from at least one of dibasic ester compounds as shown in the general formula (I); r1 and R2 are independently aryl substituted or unsubstituted by alkyl; and R3 and R4 are independently straight-chain or branched-chain C3-C20 alkyl groups, cycloalkyl groups and alkylene groups. The method has the advantages of high catalyst activity, high molecular weight of the obtained polymer, high bulk density of powder, simple post-polymerization treatment and low energy consumption by using propane or butane as a solvent. R1-CO-OCH2R3CR4CH2O-OC-R2 (I)

The application discloses a kind of transparent environmental protection intrinsic flame-retardant epoxy resin material and preparation method and application thereof.The intrinsic flame-retardant epoxy resin material is prepared by high-temperature melting method according to certain proportion by isocyanuric acid triglycidyl ester and dicarboxylic acid, acid anhydride or diacid ester reaction.The obtained intrinsic flame-retardant epoxy resin material flame-retardant function is mainly given by isocyanurate ring, with it as the main structure of material, can make material have excellent thermal stability, mechanical property and halogen-free flame-retardant performance;Flexible fatty chain introduced by curing agent and ester group produced by reaction, so that the material has excellent toughness and environmental protection degradable performance;The application combines bulk melting reaction and casting forming process, and can prepare highly transparent and arbitrary shape, with intrinsic halogen-free flame-retardant function, environmental protection degradable high-performance thermosetting resin, which can be used as environmental protection flame-retardant organic glass in building, transportation, aviation, home, electronic and other industries, and has wide application prospect.

A primer composition, the primer composition comprising a polyacrylate dissolved or dispersed in water. The polyacrylate comprises at least (20) wt% of methyl methacrylate units, at least (15) wt% of monomeric units comprising at least one of a secondary amine, a tertiary amine, or a tertiary amide, at least (15) wt% of acrylic monomeric units having an alkyl group comprising at least four carbon atoms, and an acrylic monomer unit having a carboxylic acid group in an amount of 2.5 wt% to 10 wt%. A primer composition comprising a polymer dispersed in water and a solvent wherein the water comprises at least (50) wt% of the primer composition and the solvent comprises at least one of propylene carbonate, a polyol, a polyol ether, a polyol ether ester, or a dibasic ester. An adhesive system includes a primer composition and an adhesive tape. A method of making a bonded article is also described.

The invention discloses environment-friendly low-odor stretchable conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printing electronic materials. The environment-friendly low-odor stretchable conductive silver paste is prepared from the following raw materials: flake silver powder, silver nanoparticles, bio-based polyurethane, an acrylic elastomer, PEDOT: PSS microgel, a sulfobetaine-silane copolymer, polyquaternium-10, 1, 2, 4-triazole or a derivative thereof, cellulose ester, fumed silica, ethylene glycol monoethyl ether acetate, dibasic acid ester, a flatting agent and water. The environment-friendly low-odor stretchable conductive silver paste disclosed by the invention has the advantages of low VOC emission, low odor, good skin compatibility and good chemical stability, and can still keep no dendrite and low drift under long-term coupling of sweat and bias voltage; low-resistance densification can be achieved at 130 DEG C for 30 min, printing is friendly, and the method is suitable for roll-to-roll large-area manufacturing.

The present invention provides a ceramic scintillator array that can suppress the decrease in optical output after prolonged X-ray irradiation. [Solution] The ceramic scintillator array 1 of the embodiment comprises a plurality of scintillator segments 2 and a reflective layer. The reflective layer contains a resin composition. The resin composition contains a transparent resin and an additive. The additive is a dibasic acid ester.

The invention belongs to the technical field of base oil preparation, and provides bio-based polyol base oil and a preparation method thereof. The preparation method comprises the following steps: firstly, modifying polypropylene glycol by utilizing epoxidized soybean oil through catalysis of Lewis acid to prepare an epoxidized soybean oil modified polyether component; meanwhile, bio-based azelaic acid and branched chain alcohol are subjected to a high-temperature esterification reaction under the action of a catalyst, and a dibasic acid ester component with excellent low-temperature performance is prepared; in addition, citric acid is taken as a core framework and firstly reacts with oleyl alcohol to form an oil-soluble main body, then a benzoyl group is grafted and substituted by utilizing a hydroxyl site in the center, and finally an anti-wear metal passivation functional group containing a sulfur and nitrogen heterocyclic ring is introduced into a side chain through a thiol-ene reaction; the epoxidized soybean oil modified polyether, dibasic acid ester, a multifunctional additive and poly-alpha-olefin base oil are compounded, homogenized and blended to obtain a target product, and the prepared base oil has the advantages of a bio-based source and high-performance synthetic oil and has good lubricity and environmental friendliness.

Provided is a radiative cooling device that is flexible, has increased weather resistance, and can be produced at a low cost. The radiative cooling device includes: an infrared radiative layer A having a radiative surface H for radiating infrared light IR; and a light reflective layer B on a side of the infrared radiative layer A, which is opposite to the radiative surface H. The infrared radiative layer A is a resin material layer J having a thickness adjusted so that the resin material layer emits heat radiation energy greater than absorbed solar energy in a wavelength range from 8 μm to 14 μm. The resin material layer J includes a vinyl chloride-based resin as a resin material in which a plasticizer is mixed. The plasticizer is any of phthalic acid esters, aliphatic dibasic acid esters, and phosphoric acid esters.

To provide an oil-based ink composition for writing instrument, which is excellent in adhesion on poorly wetted writing surfaces and makes it possible to form excellent calligraphy without blurring, with no precipitation of polyether-modified silicone in aqueous ink even in low-temperature environments by adding a dibasic acid ester, and a writing instrument housing the same.SOLUTION: An oil-based ink composition for a writing instrument at least contains a coloring agent, an organic solvent, a resin, a polyether-modified silicone, and a dibasic acid ester. The polyether-modified silicone is a side-chain type polyether-modified silicone, a both terminal type polyether-modified silicone, or an ABN type polyether-modified silicone.SELECTED DRAWING: None