244 results about "Gutta-percha" patented technology

The invention discloses an extraction method of filament eucommia rubber from eucommia leaves and peel; the method uses petrol ether as solvent to extract the eucommia rubber and has the steps: first, the eucommia leaves or the peel is made into small pieces and added with NaOH solution to dissolve cuticle; then cellulase is added to hydrolyze cell wall; the petroleum ether solvent at 60 DEG C to 90 DEG C of boiling range is added; then the obtained solution is extracted through recirculation at the temperature of 85 DEG C and filtrated when being hot, then cooled and frozen; the filament eucommia rubber is produced after filtration. Concentration of the NaOH solution is 0.5 percent to 1.5 percent and the dissolution time is 6 hours; pH value of the cellulase used for hydrolyzing the cell wall is 4 at temperature of 50 DEG C; enzymatic hydrolysis time is 1 hour to 2 hours and the time for reflux extraction is 2 hours; the frozen time is 30 minutes to 60 minutes at temperature of minus 20 DEG C to 0 DEG C. The method can effectively and completely extract the eucommia rubber to make original eucommia rubber and keep the original biological characteristics and physical properties and status and the original molecular structure and polymerization of the eucommia rubber; the method uses the cellulose to extract pretreated eucommia leaves raw materials, and gets the eucommia rubber of high quality when getting high yield.

The invention provides natural and fatigue-resistant gutta-percha vulcanized rubber and a preparation method thereof and relates to rubber and a preparation method thereof. The natural and fatigue-resistant gutta-percha vulcanized rubber is prepared from components in parts by weight as follows: 10-100/0-90 parts of the gutta-percha/blend rubber, 4-8 parts of an active agent, 1-4 parts of an anti-aging agent, 30-80 parts of reinforcing filler, 1-6 parts of a vulcanizing agent, 1-4 parts of a vulcanization accelerator, 0-10 parts of a softening agent and other auxiliaries. The preparation method of the fatigue-resistant gutta-percha/blend rubber vulcanized rubber comprises the following technological steps: A, plastication and mixing; B, remilling and vulcanization. The fatigue-resistant gutta-percha/blend rubber vulcanized rubber has reasonable components in the formula and higher anti-fatigue performance. The vulcanized rubber material prepared with the method has good anti-fatigue performance and long service life, can be widely applied to tires, triangular belts, synchronous belts, conveying belts and shock-reducing rubber products and has higher popularization and application value.

Provided is a method of extracting gutta-percha through enzymolysis. One of natural eucommia skin or eucommia leaves or eucommia wing skin is placed in clean water to be cleaned and dried, and moisture content of the eucommia skin, the eucommia leaves, or the eucommia wing skin is enabled to be less than 5%. A compound enzyme which comprises, by mass, 0.27% of cellulose, 0.01% of pectinase, and 0.02% of protease is added, enzymolysis undergoes 1-3 days under stirring at a speed of 500 r/min under 50 DEG C. Mixture after the enzymolysis is filtered, dregs of the filtered mixture are sent to an ultrasonic extraction tank for ultrasound extraction, and glue mixed liquor is produced. The glue mixed liquor is filtered in a grading mode, impurities are eliminated, and the glue mixed liquor with the impurities eliminated is sent to a separation tank. Eventually the gutta-percha is extracted through the method that gutta-percha crystals are precipitated at a low temperature. The method is simple in process, little in pollution, high in yield rate, low in cost, and ideal in effect; the extraction rate reaches more than 95%, and the gutta-percha content reaches 99.9%; and the produced gutta-percha is long in gelatin silk, high in tensile and tearing-proofing physical strength, and capable of being applied to wide fields.

The invention relates to a method for extracting natural products, in particular to a method for extracting eucommia gum from eucommia leaves by using a biological method. The following process steps are included: the first step is pretreatment of eucommia leaves, including pulping and enzymatic hydrolysis. The second step is the preparation of the nitrogen source, including membrane filtration, membrane concentration and resin adsorption, and drying the membrane filtration concentrate and the subcolumn liquid as the nitrogen source for later use. The third step: extraction of eucommia gum, including inoculation of Eucommia ulmoides-16 for solid-state fermentation, separation of solid and liquid from the fermentation product, drying of the liquid as a carbon source for future use, and light washing and refining of the crude gum to obtain fine gum. This method has high production efficiency, low production cost, and can co-produce chlorogenic acid to increase income.

The invention relates to a shape memory functional material containing gutta-percha and a method for making the same. The functional material is technically characterized in that the compositions in mass portion are: 10 to 50 portions of gutta-percha, 10 to 60 portions of rubber, 10 to 30 portions of polyethylene, 0.5 to 3 portions of accelerating agent containing sulfur, 1 to 3 portions of antideteriorant, 1 to 5 portions of zinc oxide, 0 to 2 portions of magnesia, 1 to 5 portions of sulfur, 1 to 3 percent of dicumyl peroxide, 10 to 70 portions of siliceous reinforcing agent and 1 to 10 portions of stearine. The invention provides the shape memory functional material containing gutta-percha and the method for making the same and can be applied to produce the products such as an orthopedic external fixation material, a prosthetic limb sleeve, a sports protection tool and a health beauty appliance. A medical gutta-percha plate replaces plaster to serve as the orthopedic external fixation material because the gutta-percha plate is sanitary, light and convenient and radiotransparent X, has convenient and simple operation, high quality and low price, and is more popular compared with other imported macromolecule materials for replacing plaster; the shape memory functional material can be made into a film stuck with the metal perfectly because the material has good radar wave-transparent performance, thereby synthesizing a radar wave-transparent material for sealing a pore radar waveguide antenna and contributing to the development of the war industry.

Improved compositions comprising a mixture of gutta-percha and a hydraulic material containing calcium silicate, calcium aluminate, calcium phosphate, and calcium sulfate compounds are provided. Preferably, the composition includes hydroxylapatite mineral. The composition is particularly suitable for obturating and sealing dental root canals. The composition should provide a stable barrier to bacterial and fluid leakage in the root canal system of a tooth. In addition, the composition should help promote the growth of new bone and tissue surrounding the root tip area.

The invention discloses a grafted gutta percha asphalt modifier which relates to modification of asphalt serving as a building material in the technical field of transportation. The conventional asphalt modifier is mainly selected from byproducts of the petrochemical industry, such as SBS (Styrene Butadiene Styrene), SBR (Styrene Butadiene Rubber) and the like. The materials are nonrenewable and have high dependence on high-quality crude oil. The invention provides natural renewable high polymer gutta percha for asphalt modification, which is used for lowering the dependence of the conventional asphalt modifier on petroleum serving as a nonrenewable resource. The gutta percha is trans-form-polyisoprene which is easy for ordered agglomeration and crystallization and cannot be directly applied to asphalt modification. In the grafted gutta percha asphalt modifier, small molecules are grafted on the long chain of a gutta percha molecule to partially damage the crystallization of the gutta percha. Although the elasticity of the gutta percha is not as high as that of gutta percha treated by vulcanization, a part of plasticity is kept and the gutta percha becomes a rubber-plastic dual thermoplastic elastic material. High and low temperature performance of asphalt can be improved, and technical requirements of national and ministerial standards are met.

The invention relates to a gutta-percha masterbatch co-blended material capable of being directly used as a traditional rubber material. Gutta-percha is hard rubber at room temperature, cannot be directly used as a rubber material, thereby hindering large-scale application of the gutta-percha in rubber industries. The gutta-percha is specially co-blended with other rubber types to prepare a gutta-percha masterbatch. The preparation method can be divided into a dry process and a wet process, wherein the dry process comprises that through a temperature controllable open mill, an internal mixer, an extruder, a mixing machine and other processing devices, the gutta-percha is evenly mixed in other rubber types according to a certain proportion to prepare the co-blended new material; the wet process comprises that through a reaction kettle, a stirring kettle and other devices, the gutta-percha and other rubber types are dissolved in a good solvent according to a proportion and fully stirred to prepare the co-blended new material through solvent recovery and other processes. According to the processes, the gutta-percha raw masterbatch can be prepared; other auxiliary agents are added to prepare the gutta-percha composite masterbatch, and the barrier is cleared up for large-scale market application of the gutta-percha.

The present invention provides an improved root canal filling point/cone having a structure that can be manufactured precisely to result in better obturation with less micro-leakage. One aspect of the present invention is directed to a molded root canal filling point having progressively decreasing tapers from the smaller tip end to the larger end. Another aspect of the present invention is directed to a thermo-pressure molding process for manufacturing root canal filling appliances (e.g., Gutta Percha points). A further aspect of the present invention is directed to the structure of the mold for undertaking thermo-injection molding.

The invention discloses a method for increasing the gutta-percha content in eucommia leaves by spraying chemicals on the leaves. The method comprises the steps of preparing water solution with the concentration of salicylic acid being 10-200ppm and the mass fraction of magnesium sulfate being 0.01-0.08 percent, spraying the prepared solution to the leaves of growing eucommia trees on the rainless days before sunrise or after sunset and carrying out spraying for 1-4 times every two months, wherein the spraying interval is not shorter than 15 days. By adopting the method for carrying out foliage spray, the eucommia leaves can be harvested from October to November, and the gutta-percha content in the eucommia leaves is higher than the gutta-percha content in the eucommia leaves growing on the same condition without foliage spray by 20-50 percent. The method can be implemented in an industrialized, large-scale and standardized mode, and is good in economic benefit and wide in market application prospect.

A complete melting type cordless filling instrument for endodontic treatment is disclosed which uses a switching circuit, to be operable using a miniature dry battery for supplying DC power. The filling instrument includes a body with a battery for supplying DC power, a heater at a front end of the body to heat and melt gutta-percha, an injector mounted to the body in front of the heater to discharge the melted gutta-percha, a charging part provided at the body to charge the gutta-percha in the body, a feeding member which feeds the gutta-percha charged in the body, a filling switch which turns on the heater, and a control circuit installed in the body, to control a temperature of the heating core and an operation of the heating core. The control circuit includes the filling switch, and a switching circuit adapted to efficiently maintain electrical energy supplied from the battery.

The invention discloses a method for extraction and separation of chlorogenic acid, pinoresinol diglucoside, aucubin and gutta-percha from a eucommia ulmodies oliv raw material. The method comprises the steps: extracting from the eucommia ulmodies oliv raw material by an organic solvent, concentrating, successively carrying out hot water dissolving, cold precipitation and centrifugal separation on the concentrate to obtain a centrifugal liquid, carrying out enrichment, elution and concentration on the centrifugal liquid, to obtain an eucommia ulmodies oliv extract, separating and purifying the eucommia ulmodies oliv extract, and thus respectively obtaining the pinoresinol diglucoside, chlorogenic acid and aucubin; and carrying out hydrolysis and organic solvent extraction on the extract residue, to obtain the gutta-percha. The method extracts and separates the high-purity chlorogenic acid, pinoresinol diglucoside, aucubin and gutta-percha from the eucommia ulmodies oliv with relatively high yield simultaneously, has the advantages of simple operation and low cost, realizes the comprehensive utilization of natural resources, and meets industrialized production.

A gutta-percha remover suitable for removing gutta-percha and having flexibility with good compliancy to curvature of a root canal and superior removing capability for forming a sufficient gap between the gutta-percha and the root canal wall is provided.

A gutta-percha remover (10) includes a shaft (12), a tapered working portion (13) connected to the shaft (12), and one, two, or more screw-shaped grooves (14) formed in the working portion, wherein as to cross sections (13a, 13b) of a base end and a tip of the working portion, the tip of the working portion (13) is greater in rate of the area of each cross-section to corresponding circle (13a3, 13b3) circumscribing said each cross section.

The invention discloses a preparation method of root canal filling materials, which comprises the steps that: (1) the mixture composed of thermoplastic copolymerization-modified polymer or/and grafted modified polymer and inorganic filler treated with surface modification as well as compounds which have resisting function to X-ray is evenly blended by adopting a kneader; and (2) the mixture is mixed for 5 minutes to 40 minutes in melting state with the temperature of 140 DEG C to 250 DEG C, then the root canal filling materials of the invention are prepared; the root canal filling materials prepared by the method has the advantage of not only excellent stability of gutta-percha filling materials, but also excellent cohesiveness of Resilon resin filling materials; the defects of poor adhesive bonding performance of the gutta-percha filling materials and easy degradation of the Resilon resin filling materials which are used in current clinics can be overcome; and compared with the gutta-percha filling materials and the Resilon resin filling materials, the stability and the cohesiveness are greatly improved.

The invention discloses a method for extracting high-purity gutta-percha from cortex eucommiae key fruit. The method comprises the steps of: 1, processing the cortex eucommiae key fruit, particularly separating kernel from the cortex eucommiae key fruit mechanically; 2, carrying out enzymolysis, adding 3-10 times of enzymatic hydrolysate in the processed enzymolysis and carrying out enzymolysis for 3-10h at a temperature of 35-55 DEG C; and 3, extracting the high-purity gutta-percha, drying the cortex eucommiae key fruit subjected to the enzymolysis until the water content is 3-10 percent, extracting with petroleum ether as a solvent through adopting a soxhlet extraction method, adding alcohol to precipitate the gutta-percha after extracting, and filtering to obtain the high-purity gutta-percha. According to the invention, complex enzyme preparation enzymolysis, soxhlet extraction and ultrasonic assistance are applied to the field of extraction of the gutta-percha. Compared with the prior art, the method has the characteristics of mild reaction conditions, low requirement on equipment, no pollution, and high yield and purity of the gutta-percha, and is wide in application prospect.

The invention belongs to the technical fields of manufacturing and applying of a DLP strengthened material and stomatology, and particularly relates to a gutta-percha tip composite. The gutta-percha tip composite comprises the following components in parts by weight of 5-20 parts of a modified developer, 5-20 parts of a modified antibacterial agent and 60-80 parts of photosensitive resin, whereinthe modified developer and the modified antibacterial agent are obtained through surface modification with a surface modifier. The gutta-percha tip composite is suitable for DLP printing, has favorable characteristics of favorable mechanical properties, favorable antibacterial effects and favorable biocompatibility, is high in production and processing precision, and can realize smooth printing. The gutta-percha tip composite can be widely applied to the biomedical science field, particularly the stomatology field. The root canal treatment accuracy can be improved, and a new way is provided for reduction of the failure rate of root canal treatment.

The invention relates to a gutta-percha refining system, which consists of a continuous dissolution device, a continuous filtering device, a continuous coagulation device and a drying device that are arranged in order. The continuous dissolution device comprises a stirring mechanism equipped premixing kettle and a dissolution kettle. The premixing kettle and the dissolution kettle are connected in series, a feed pump is disposed between the two, and the upper part of the premixing kettle is provided with a material conveyor. The continuous filtering device comprises a horizontally installed filter cylinder, the inside of which is provided with a screw propeller. A filtrate receiving tank is disposed below the filter cylinder. The continuous coagulation device includes a coagulation kettle connected to the filtrate receiving tank. The lower part of the coagulation kettle is provided with a coagulant inlet, the top is provided with a mixed gas outlet, which is connected to condenser and an oil-water separator in order. The oil outlet of the oil-water separator is in connection with the premixing kettle. With a reasonable structure, the gutta-percha refining system provided in the invention ensures continuous production, and has substantially improved automation degree and productivity.

The invention provides a gutta-percha bead filler for a tire and a preparation method thereof and relates to a bead filler for a tire and a preparation method thereof. Gutta-percha is synthesized (TPI) or natural gutta-percha (EUG), the number-average molecular weight is 150,000-500,000 and the molecular weight distribution index PI is 1.8-3.5. The natural gutta-percha is derived from a gutta-percha extract contained in leaves, peels and shells in eucommia ulmoides plants. The invention adjusts a production technology for preparing the gutta-percha bead filler for a tire with higher hardness and strength. According to the invention, after the gutta-percha is combined with the others, various mechanical properties of the sizing material, such as, overall hardness, ageing resistance, fatigue resistance, shearing resistance and dynamic temperature rise, are improved, wherein the improvement of permanent deformation under compression and dynamic heat dissipating is especially obvious; after the bead filler is prepared, the shape of a tire ring can be excellently kept; the operation stability of a tire can be increased, the rolling resistance can be reduced and the fatigue resistance can be enhanced; the gutta-percha bead filler is suitable for the manufacturing of various tire products.

An integral, one-piece silanated particle impregnated gutta percha core/cone technique employs a thin layer of a luting agent, such as glass ionomer cement with a machined gutta percha core/cone, precisely matches the preparation, thereby reducing leakage and achieving a hermetic seal. The hermetic seal is further enhanced by a mono-block bond that occurs between the silanated particles in the gutta percha and the appropriate chemical sealant. Optional cryogenic treatment of the gutta percha material changes its molecular weight, making it stiffer and conducive to forming an integral, one piece core/cone, without the need for a separate carrier core to install the tapered gutta percha core/cone within the root canal. Additionally, the tapered body of the core/cone may be reticulated in a slightly three dimensional texturized framework to increase surface area and therefore increase retention. Optional line demarcation indicia are also placed on the core/cone. Additionally, the head of the core/cone can be gripped by a delivery vehicle clasp.

The invention discloses a method for extracting gutta-percha from the leaves and bark of eucommia ulmoides. The method comprises the steps that the leaves and bark of the eucommia ulmoides are washed, dried and mechanically crushed, soaking is carried out with aqueous alkali at normal temperature, filtering is carried out, and filter residues are subjected to high temperature sterilization; an aqueous surfactant solution is added to adjust the moisture content of the filter residues, then the filter residues are inoculated with actinomycetes strains, a carbon source and a nitrogen source are added, and fermentation is carried out to damage cellulose in the leaves and bark of the eucommia ulmoides; then the gutta-percha is extracted through a conventional solvent method. Through aqueous alkali pretreatment on the gutta-percha, the leaves and bark of the eucommia ulmoides are fermented through actinomycetes in an alkali environment to degrade lignin, meanwhile, and the aqueous surfactant solution is added to improve the degradation efficiency of the actinomycetes on the cellulose in the leaves and bark of the eucommia ulmoides. According to the method, the gutta-percha yield is increased, and meanwhile the efficiency of extracting the gutta-percha through a biodegradation method is improved.

An integral, one-piece silanated particle impregnated gutta percha core/cone technique employs a thin layer of a luting agent, such as glass ionomer cement with a machined gutta percha core/cone, precisely matches the preparation, thereby reducing leakage and achieving a hermetic seal. The hermetic seal is further enhanced by a mono-block bond that occurs between the silanated particles in the gutta percha and the appropriate chemical sealant. Optional cryogenic treatment of the gutta percha material changes its molecular weight, making it stiffer and conducive to forming an integral, one piece core/cone, without the need for a separate carrier core to install the tapered gutta percha core/cone within the root canal. Additionally, the tapered body of the core/cone may be reticulated in a slightly three dimensional texturized framework to increase surface area and therefore increase retention. Optional line demarcation indicia are also placed on the core/cone. Additionally, the head of the core/cone can be gripped by a delivery vehicle clasp.

The invention discloses a method for extracting gutta-percha through enzymolysis. The method comprises the following steps: eucommia barks using as raw materials are burst and crushed, protease is used for decomposing protein components in the eucommia barks, pectinase is used for decomposing cell walls and intercellular layers in the eucommia barks, cellulase is used for improving the decomposition of cellulose and hemicellulose so as to decompose non-gutta-percha substances in the eucommia barks into components which can be completely separated from gutta-percha, and target substances are separated from waste components by adopting a method of rotating a separation tube in an enzymolysis device in a water tank, wherein rectangular stirring blades are arranged on the inner wall of the separation tube, and form inclination angles of 10 to 15 degrees with a support shaft, so that the separation completeness of the target substances and the waste components is ensured. The method is clean, safe, environment-friendly, low in cost, high in efficiency and suitable for industrial production, and the purity of the extracted gutta-percha is high, and can reach over 92 percent.

The invention discloses a preparation method of modified natural gutta-percha with improved elasticity.The method comprises the steps that gutta-percha is dissolved in an organic solvent A to be prepared into a gutta-percha solution, then, the gutta-percha solution is added into a reaction kettle, a conjugated diene monomer and a catalyst are added, then a reaction is performed at the constant temperature, then the reactant is precipitated and washed with an organic solvent B and finally dried in a low-temperature vacuum drying box to obtain constant weight, and therefore the modified natural gutta-percha is obtained.The preparation method has the advantages that the original degree of crystallinity of the gutta-percha is lowered, elasticity of the gutta-percha is increased, and the characteristic of the gutta-percha can reach using standard character of natural rubber, so that the gutta-percha can be widely applied in rubber industry, the condition of lack of natural rubber resources in China is relieved, gutta-percha which is endemic to china, wide in planting area and easy to popularize is efficiently utilized and popularized, the problem that the gutta-percha cannot be widely applied in rubber industry is solved, preparation technology is simple, the using effect is good, and popularization is promoted.

The invention relates to the field of rubber materials, in particular to a novel oil-resistant gutta-percha elastomer and a preparation method thereof. According to the preparation method, gutta-percha serves as a raw material, and mercaptan serves as a graft micromolecule and is grafted onto original double bonds of the gutta-percha by using a click chemical method so as to obtain the novel oil-resistant gutta-percha elastomer. According to the novel oil-resistant gutta-percha elastomer and the preparation method thereof, a regular structure of trans-isoprene in a molecular chain of the gutta-percha is destroyed, so that the gutta-percha is in an elastomer form under the normal temperature condition, and the application field of the gutta-percha is expanded; and the grafting yield can becontrolled through the reaction time, when the grafting rate exceeds a critical value, a crystalline structure in the gutta-percha molecule can be destroyed, meanwhile, functional groups with different polarities are introduced, so that the physical properties of the gutta-percha are changed, and the gutta-percha is endowed with new chemical performance. Different from graft modification a traditional free radical method, the novel oil-resistant gutta-percha elastomer and the preparation method thereof have the advantages that the click chemical method is not liable to cause side reactions, inaddition, the reaction period is short, reaction products are controllable, and a process is simple.

The invention provides a manufacturing method of a root canal filling tip, and belongs to the field of medical equipment. The manufacturing method of the root canal filling tip comprises the following steps: step 1, selecting a medical vanadium-free nickel-free titanium alloy wire as a raw material; step 2, processing a first end of the vanadium-free nickel-free titanium alloy wire into a cone to form a closed section; step 3, processing a filling section from a thick end of the closed section on the vanadium-free nickel-free titanium alloy wire; step 4, cutting into a plurality of scale lines from one end of the filling section on the vanadium-free nickel-free titanium alloy wire to form a depth measuring section; and step 5, manufacturing a mould with a mould cavity, putting the filling section in the center of the mould cavity of the mould, and injecting heated gutta-percha into the mould cavity to enable the gutta-percha to uniformly wrap the periphery of the filling section. The root canal filling tip manufactured by the manufacturing method provided by the invention adopts the vanadium-free nickel-free titanium alloy wire as the raw material, has high biocompatibility and is safe to use; and the root canal filling tip adopts an integrally formed structure, avoids welding and prevents harmful substances in a welding flux from permeating a human body.

The invention discloses a gutta-percha and nanocellulose composite film and a preparation method thereof, and relates to the technical field of composite films. The preparation method comprises the following steps: dissolving gutta-percha into an organic solvent to obtain a gutta-percha solution; adding nanocellulose to the gutta-percha solution; stirring to obtain a mixed solution; pouring the mixed solution into a flat plate or a die of which the bottom is flat; ventilating and drying under a room temperature to obtain the gutta-percha and nanocellulose composite film. According to the method, gutta-percha and nanocellulose are composited to form a macromolecular film for the first time; the elongation at break is 200-365%; the gutta-percha and nanocellulose composite film is degradable, green, environmentally friendly, and renewable; the preparation method is simple, efficient, and free from any additive.