139 results about "Cyanoacrylate adhesive" patented technology

The invention discloses a method for preparing a porous tantalum medical implant material. The method comprises the following steps of: feeding mixed tantalum power formed by mixing pure tantalum powder and a forming agent into a printing platform of a three-dimensional printer, and rolling and paving; spraying an adhesion agent by a printing head of the three-dimensional printer to adhere the mixed tantalum powder so as to form a two-dimensional plane; descending a working table 80 to 100 mu m, and processing the next layer; accumulating and forming layer by layer; removing the tantalum powder particles which are not adhered to obtain an initially formed sample; and performing aftertreatment such as degreasing, vacuum sintering, cooling and the like to obtain the porous tantalum medical implant material, wherein the volume ratio of the pure tantalum powder to the forming agent is (60-80):(20-40), and the adhesion agent is 1 mass percent alpha-cyanoacrylate adhesive. The pores of the porous tantalum medical implant material prepared by the method are completely communicated in a three-dimensional mode; the porous tantalum medical implant material prepared by the method is high in biocompatibility; and meanwhile, the mechanical property of the porous tantalum medical implant material prepared by the method is consistent with that of loading bone tissues of a human body.

The invention discloses an optical solidifying cyanacrylate binder, which comprises the following parts: 65. 00-90.00% alpha-cyanacrylate, 5. 00-30.00% (methyl) acrylate, 0.10-4. 00% adhesion accelerant, 0.01-2. 00% stabilizer and 0.10-5. 00% optical initiator. the invention is fit for binding metal, plastic, rubber, wood, polyolefin and fluorine product, which possesses excellent binding effect.

An activator composition for the accelerated hardening of cyanoacrylate adhesives, wherein the activator comprises a member selected from the group consisting of: aromatic heterocyclic compounds having at least one N hetero atom in the ring(s) such as pyridines, quinolines and pyrimidines and substituted on the ring(s) with at least one electron-withdrawing group which decreases the base strength of the substituted compound compared to the corresponding unsubstituted compound, mixtures of any of the foregoing with each other, and/or with N,N-dimethyl-p-toluidine, and mixtures of any of the foregoing and/or N,N-dimethyl-p-toluidine with an organic compound containing the structural element, —N═C—S—S—, such as dibenzothiazyl disulfide. 6,6′dithiodinicotinic acid, 2,2′-dipyridyl disulfide, and bis(4-t-butyl-1-isopropyl-2-imidazolyl)disulfide. An activator composition may comprise a solution of one or more activators in a solvent mixture which comprises a volatile hydrocarbon and a cyclic ketone.

The invention discloses a toughened alpha-cyanoacrylate adhesive and a preparation method thereof. The adhesive comprises the following components: alpha-cyanoacrylate, a polyurethane prepolymer which is 20 to 60 percent based on the mass of the alpha-cyanoacrylate, an anionic polymerization inhibitor which is 50 to 250ppm based on the mass of the alpha-cyanoacrylate, a radical polymerization inhibitor which is 100 to 2,000 ppm based on the mass of the alpha-cyanoacrylate, a thickener, a heat resistant agent, a reinforce, a pigment, a spice and the like. The method for preparing the adhesive comprises: adding the polyurethane prepolymer which is 20 to 60 percent based on the mass of the alpha-cyanoacrylate and the alpha-cyanoacrylate into a three-necked flask, mixing and stirring the polyurethane prepolymer and the alpha-cyanoacrylate for 1 hour at 50 to 60 DEG C and obtaining an alpha-cyanoacrylate and polyurethane prepolymer complex; and filling the alpha-cyanoacrylate and polyurethane prepolymer complex, the radical polymerization inhibitor and the anionic polymerization inhibitor into the three-necked flask, and mixing and stirring the materials in the three-necked flask till the mixture is uniform. The anionic polymerization inhibitor is 50 to 250ppm based on the mass of the alpha-cyanoacrylate and the radical polymerization inhibitor is 100 to 2,000 ppm based on the mass of the alpha-cyanoacrylate.

A sterilized cyanoacrylate adhesive composition including a cyanoacrylate composition and a cure speed enhancer, wherein the sterilized cyanoacrylate adhesive composition does not cure upon sterilization. A kit for applying the sterilized cyanoacrylate adhesive composition, including the cyanoacrylate adhesive composition and an applicator. A method of making the sterilized cyanoacrylate adhesive composition, by adding a cure speed enhancer to a cyanoacrylate adhesive composition and sterilizing the composition. A method of applying the sterilized cyanoacrylate adhesive composition to tissue by applying the sterilized cyanoacrylate adhesive composition as a liquid, and quickly curing the sterilized cyanoacrylate adhesive composition. A method of sealing tissue by applying the sterilized cyanoacrylate adhesive composition as a liquid to tissue to be sealed, quickly curing the sterilized cyanoacrylate adhesive composition, and sealing the tissue.

This invention relates to cyanoacrylate-containing compositions that include, in addition to the cyanoacrylate component, a rubber toughening component, which is substantially clear and colorless and which is substantially free of release agents and anti-oxidants known to impair the fixture speeds and shelf life stability of cyanoacrylate compositions to which they are added. As a result, the inventive rubber cyanoacrylate adhesive compositions demonstrate improved properties, such as fixture speed, strength and shelf life under accelerated aging conditions.

The invention discloses a medical cyanoacrylate adhesive. The medical cyanoacrylate adhesive comprises the following components in percentage by weight: 80-95% of cyanoacrylate, 2-10% of citrate, 2-8% of a formaldehyde inhibitor, 0.1-0.5% of hydroquinone, and 0.1-1.0% of a sulfur dioxide stabilizer; a preparation method for the formaldehyde inhibitor is as follows: 6 parts of polylactic acid and casein (the mass ratio is (0.4-0.6) : (0.6-0.4) by weight are dissolved in 94 parts of chloroform solvent; 2-4 parts of sodium sulfite powder are added under the high speed stirring to form a dispersion phase to prepare microcapsules by spraying and drying; 0.01-500 microns of microsphere capsules are prepared after water washing and drying and used as the formaldehyde inhibitor. The medical cyanoacrylate adhesive disclosed by the invention effectively restrains the formaldehyde generation through the preparation of the formaldehyde inhibitor, and has the advantages of low formaldehyde concentration, high adhesive strength, good toughness of an adhesive film and little irritation to tissues.

The invention provides a method for preparing Alpha-cyanoacrylate adhesive which has low whitening degree, low stimulation and high toughness. The Alpha-cyanoacrylate adhesive is prepared by using paraformaldehyde or formalin and alkyl cyanoacetate as main materials, enabling the paraformaldehyde or formalin and the alkyl cyanoacetate to carry out condensation reaction at the temperature of 80-90 DEG C under the action of dehydrant and alkaline catalyst and then mainly carrying out the reduced pressure distillation, heating depolymerization and other processes. Compared with similar products, the Alpha-cyanoacrylate adhesive has greatly reduced whitening degree and stimulation, thereby improving the attractiveness of an adhesive product and being good for improving the adhesive strength of the adhesive product. In addition, the method for producing the Alpha-cyanoacrylate adhesive is simple and feasible, thereby the performance of the adhesive product is remarkably improved and the manufacturing cost of the adhesive product is lowered.

The invention discloses an improving method of storage stability of alpha-cyano acrylate adhesive in the alpha-cyano acrylate adhesive domain, which comprises the following steps: adopting cyanoacetate and formagene or formaldehyde solution as raw material; using low-boiling point organic solvent to coboil with water as dehydrant under alkaline catalyst; doing condensing reaction at 80-100 deg. c under normal pressure or 60+-5deg. c without vacuum degree at 0.5-50mmHg without dehydrant; adding alcohol removing agent after dehydrating completely to stir sufficiently; refluxing stably for 0.5-2h; recycling (dehydrant)alcohol removing agent to add inhibitor to do cracking distilling with vacuum degree at 0.5-25mmHg under 160-220 deg. c; rectifying; obtaining the product; obtaining the product with alcohol content less than 50ppm to keep biological property over normal temperature.

The invention relates to a surface treating agent for binding silicon rubber and plastic, a preparation method and an application method thereof. The surface treating agent is made by mixing an amino silane-containing coupling agent and an organic solvent, the content of the amino silane-containing coupling agent is 0.5-5% and the content of the organic solvent is 95-99.5% by mass percent; the organic solvent can be any one or mixture of any two or more than two of benzene, toluene, xylene and petroleum ether at any ratio. The invention has the beneficial effects that: the organic solvent can expand the high molecular silicon rubber to cause the amino silane-containing coupling agent to be easily and evenly dispersed on the surface of the silicon rubber, and can cause part of the amino silane-containing coupling agent to infiltrate into pores on the surface of the silicon rubber, thus improving the adhesiveness; and alpha-cyanoacrylate adhesive can bond with the plastic rapidly and reach a use strength which is hard to be separated, and the adhesive is completely cured after 24h.

The present invention provides a cyanoacrylate adhesive composition having high shear bond strength, peeling bond strength, tensile strength and impact bond strength and superior wear characteristics particularly in toy applications where hostile play environments demand hot-cold cycle resistance. The cyanoacrylate adhesive composition contains (a) up to 20% by weight of a cyanoacrylate monomer, (b) a styrene-based elastomeric block copolymer, and (c) a specific solvent which is selected to effect the solution of both components. The invention is also directed to a method of applying the instant adhesives to substrate surfaces.

The present invention relates to strengthened cyanoacrylate adhesive compositions. More particularly, the present invention relates to strengthened cyanoacrylate adhesive compositions which contain agraphite platelet material that increases the shear and peel strength of the compositions.

There is provided a cyanoacrylate composition comprising:

• • a cyanoacrylate; and
  • a 2-substituted benzothiazole or a derivative thereof

wherein the 2-substituent is an alkyl, an alkene, an alkylbenzyl, an alkylamino, an alkoxy, an alkylhydroxy, an ether, a sulfenamide, a thioalkyl or a thioalkoxy group, with the proviso that an amide portion of the sulfenamide does not have a tert butylamino or a morpholine group.

Cyanoacrylate adhesive compositions comprise a mixture of two cyanoacrylate monomers, including 2-octyl cyanoacrylate and n-butyl cyanoacrylate. The monomers are stabilized and sterilized by irradiation, and do not substantially increase in viscosity after sterilization or after two years of shelf storage. These compositions have anti-microbial properties, and may be used to close wounds as well as secure catheters inserted into the body in place.

The invention relates to the field of adhesives, especially to a toughened alpha-cyanoacrylate adhesive. The adhesive comprises the following components by weight percentage: 85-99% of an alpha-cyanoacrylate monomer; 0.001-10% of an anionic polymerization inhibitor; 0.01-4% of a free radical polymerization inhibitor; and 0.01-5% of micro-nano size core-shell particles. According to the invention, micro-nano size core-shell particles are introduced into the alpha-cyanoacrylate adhesive to enhance the toughness and impact resistance of the alpha-cyanoacrylate adhesive. The alpha-cyanoacrylate adhesive prepared according to the invention not only has good toughness, but also has high viscosity, is conducive to bonding porous materials and is suitable for wide-gap scenes.

Gap-filling cyanoacrylate adhesives containing cyanoacrylate esters and organic halogenated polymers with a K-value of at least 46.