13results about How to "Improve grafting efficiency" patented technology

The application relates to the field of graphene oxide, and discloses modified graphene oxide, which comprises graphene oxide and grafted polyoxyethylene chains, the chemical formula of the polyoxyethylene chains being -CH2CH(OH)CH2O(CH2CH2O) n CH2CH2OH, wherein n is any integer of 3-20; the grafting rate of the polyoxyethylene chains in the modified graphene oxide is 30-50%. The modified graphene oxide has good salt resistance, can resist acid / alkali aqueous solutions, and effectively inhibits the accumulation and agglomeration of graphene oxide.

The invention relates to a high-strength antibacterial spandex fabric and a preparation method thereof, and belongs to the technical field of functional textile materials. The spandex fiber comprises a spandex fiber matrix and a functional polymer layer grafted on the surface of the matrix through a covalent bond, and the functional polymer layer is a polymer of an unsaturated derivative of natural phenolic acid and is prepared by introducing carbon-carbon unsaturated bond groups such as acryloyloxy and the like into the natural phenolic acid through esterification or etherification. During preparation, the spandex fiber is subjected to plasma pretreatment, and then the spandex fiber and the natural phenolic acid-containing unsaturated derivative monomer are subjected to thermal initiation or photo-initiation graft polymerization to form the functional layer. The lasting and stable antibacterial function is achieved through covalent bond grafting, the natural phenolic acid derivative endows the fiber with the environment-friendly and non-dissolution type antibacterial property, the functional layer can improve the modulus and breaking strength of the fiber, the intrinsic elasticity of spandex is considered, the comfortable fitting characteristic of the composite fabric is reserved, and the composite fabric is endowed with the high strength and the antibacterial function.

The utility model relates to the technical field of bud grafting knives, and discloses a bud grafting knife for poplar grafting, which comprises a knife body, a hand guard block fixedly connected to the side wall of the knife body, a knife handle fixedly connected to the side wall of the hand guard block, a knife sheath slidably connected to the outer wall of the knife body, and locking assemblies arranged on the upper side and the lower side in the hand guard block. The locking assembly comprises a fixed column, a plurality of limiting balls are slidably connected into the fixed column, a movable inner column is slidably connected to the inner wall of the fixed column, and a reset spring is arranged at the bottom of the movable inner column. According to the utility model, firstly, the movable inner column is pressed, so that the reset spring is compressed under stress, the rolling ball groove moves downwards along with the reset spring, the limiting ball loses lateral pressure and is loosened, at the moment, the sheath is pulled, the limiting ball slides into the rolling ball groove under the extrusion of the inner wall of the sheath, the sheath is locked, and the effects of quickly disassembling and assembling the sheath and preventing a knife body from scratching a worker are achieved; the bud grafting knife solves the problem that a traditional bud grafting knife is prone to hurting people, and operation safety and convenience are improved.

The invention relates to the technical field of medical instruments, in particular to a heparin coating based on material surface ammonification modification and a preparation method thereof, and the preparation method at least comprises the following steps: carrying out ultrasonic pretreatment on a base material with purified water, and drying for later use; the preparation method comprises the following steps: performing amination modification on a base material subjected to ultrasonic pretreatment by adopting an ammoniation reagent solution, and immersing the base material into a heparin solution to prepare the base material with a heparin coating on the surface. The surface of the material is subjected to amination modification by adopting a micromolecular ammoniation reagent and / or a macromolecular ammoniation reagent system, complex pretreatment such as plasma and ultraviolet rays does not need to be carried out on a base material, specific functional group activation does not need to be carried out on heparin, and the heparin is directly reacted after being subjected to ammoniation modification; the stable covalent grafted heparin anticoagulation coating can be formed, the anticoagulation time is prolonged, and the long-term implantation requirement is met.

The utility model discloses a clamping frock for grafting, it includes frame structure (1), first clamp (2) for clamping stock (4), second clamp (3) for clamping scion (5), first clamp (2) is provided with two or more than two in parallel, second clamp (3) is provided with two or more than two in parallel, and first clamp (2) and second clamp (3) are set up one by one correspondingly, first clamp (2) includes fixed part and elastic pressure strip, and second clamp (3) also includes fixed part (6) and elastic pressure strip (7). The utility model can gently one -time clamping multiple stock and scion, has realized the grafting of multiple seedling simultaneously, thereby has improved grafting efficiency significantly, and easy operation is simple to operate.

The invention discloses a cubilose fruit grafting seedling raising method, and belongs to the technical field of fruit tree cultivation. The method comprises six aspects of stock planting field establishment, stock seedling raising, stock water and fertilizer management, grafting, grafted seedling water and fertilizer management and grafted seedling field management. A special cutter tool for cubilose fruit grafting is adopted, an L-shaped section can be formed, the section is smooth and good in integrating degree, and the grafting survival rate and the grafting efficiency can be improved. According to the invention, the seedling raising grids are used for stock seedling raising, so that the seedling raising cost can be saved, and the space utilization rate can be improved. According to the method, the thorn-free huanglong and the argentodoxa cuneata are adopted as the stocks, the root systems are developed, the morbidity of root-knot nematodes can be reduced, the grafting survival rate and the growth vigor are improved, and meanwhile the canker resistance of plants is improved; the quality of the rootstock is guaranteed, the grafting growth vigor is improved, bud germination is promoted, and fruit bearing is carried out in advance by optimizing the length, the period and the number of bud points of the rootstock.

This application relates to the field of demulsifiers, and more specifically, to an oil sludge demulsifier, its preparation method, and its application. An oil sludge demulsifier comprises the following components in the following mass ratio: 20-35 parts of a surfactant complex, 7-12 parts of an alkyl sulfate sodium cosolvent, 0.6-1.8 parts of a stabilizer, and 48-55 parts of water; wherein the surfactant complex comprises hyperbranched polyamide amine and polyether amine modified magnetic nanoparticles. This oil sludge demulsifier improves upon the problems of existing demulsifiers, such as low dehydration capacity, slow dehydration speed, poor demulsification effect, and low oil content, thereby improving the demulsification performance and dehydration efficiency, and achieving effective separation of oil sludge.

The invention provides a synthesis method of a fumaric acid modified nonionic surfactant, which comprises the following steps: placing BASF fatty alcohol-polyoxyethylene ether in a dry reaction bottle, and then adding fumaric anhydride; oxygen removal and low-temperature dissolution: introducing nitrogen into the reaction bottle for thorough purging so as to completely remove air in a reaction system, sealing the reaction bottle after purging is completed, and heating the sealed reaction bottle in an oil bath pan so as to completely dissolve fumaric anhydride to obtain a mixed solution; catalytic grafting reaction: adding a catalyst into the mixed solution, then gradually heating and continuously stirring, in the reaction process, monitoring the reaction progress in real time through a nuclear magnetic resonance hydrogen spectrum, and judging that the reaction is completed when monitoring that a fumaric acid double-bond characteristic peak disappears and a maleic acid double-bond characteristic peak appears, so as to obtain a reaction mixture; product post-treatment: cooling the reaction mixture to room temperature, standing, removing white precipitate, and collecting residual liquid, namely a crude product of grafted fumaric acid; and determining the grafting rate.

This invention discloses a method for preparing maleic anhydride grafted onto polyolefin elastomers. By absorbing an initiator onto the surface of the polyolefin elastomer followed by dilution, melt extrusion, and separate injection of the diluent in the molten state, this invention effectively alleviates the self-polymerization problem of maleic anhydride molecules. This allows maleic anhydride to be better dispersed in the polyolefin elastomer during grafting, reduces the reaction time of the diluent in the twin-screw extruder screw, minimizes side reactions and byproducts, effectively reduces gelation rate, and improves grafting rate and efficiency. The method provided by this invention for preparing maleic anhydride grafted onto polyolefin elastomers overcomes the limitations of high gelation rate and low grafting rate in existing technologies, which restrict processing and application. The resulting polyolefin elastomer grafted with maleic anhydride possesses the advantages of low gelation rate, high grafting rate, and high grafting efficiency.

The application relates to the technical field of high polymer material synthesis, and discloses a composite polymerization inhibition and regulation type full-water polyvinyl butyral solution and a preparation method thereof, which is prepared from raw materials such as polyvinyl alcohol, deionized water, a metal complex anchoring agent, an interface polymerization inhibitor, a grafting monomer, a chain transfer agent, an initiator and an acetalization reagent. The preparation method comprises the following steps: constructing redox active sites in polyvinyl alcohol segments by using the metal complex anchoring agent; constructing a water phase polymerization inhibition environment by using the interface polymerization inhibitor; synchronously adding the grafting monomer and the initiator to carry out grafting polymerization; and finally, preparing by a variable-temperature acetalization reaction. Through the synergistic effect of metal coordination orientation and interface polymerization inhibition effect, the application realizes the kinetic control of the grafting reaction, and effectively inhibits the homopolymerization of the grafting monomer. The introduced hydrophilic side chain is affected by electrostatic repulsion and a hydration layer, and under the condition of no organic solvent, the full-water polyvinyl butyral solution with high acetalization degree and uniform stability is prepared.

The utility model provides a citrus grafting stock cutting tool which comprises a main rod, a fixed part is arranged at the front end of the main rod, a slidable movable part is further arranged on the main rod, a chopping part is arranged on one side of the fixed part, the chopping part is perpendicular to the main rod, an annular cutting part is arranged on the other side of the fixed part, a detachable fixed blade is arranged on the inward side of the annular cutting part, and the annular cutting part is perpendicular to the main rod. According to the citrus grafting device, multiple functions such as stock girdling, end cleft grafting and side face beveling are integrated, the time for workers to switch tools is greatly shortened, the citrus grafting efficiency is remarkably improved, and the problems that in actual operation, the workers need to frequently replace different tools, time is wasted, the labor intensity of the workers is lowered, and the labor intensity of the workers is lowered are solved. And the grafting efficiency is reduced.

The application provides a method for 3D printing of a grafting auxiliary sleeve and application thereof, and the preparation method of the grafting sleeve comprises the following steps: 1) obtaining stock diameter data R1, scion diameter data R2 and scion length L; 2) obtaining wide diameter and narrow diameter data of the grafting sleeve, wherein the grafting sleeve comprises a stock sleeve and a scion sleeve; 3) inputting the wide diameter and narrow diameter data of the stock sleeve and the scion sleeve into a 3D printer; 4) obtaining the grafting sleeve by using a thermoplastic elastomer material as ink material through the 3D printer.

The application discloses a kind of multi-station automatic grafting machine, including robot clamping part, first gripper is provided on robot clamping part for clamping and transporting seedling, rootstock cutting part, mobile assembly for holding and moving seedling and cutting unit for cutting seedling stem are included in rootstock cutting part, and rootstock is cut off by cutting unit, and the root part is held by mobile assembly after moving, seedling cutting part, and seedling cutting part is symmetrically arranged with rootstock cutting part.The application provides a kind of multi-station automatic grafting machine, makes the cutting of grafting unified, can be closely fitted between the two, improve the survival rate after grafting, can work simultaneously, and then improve grafting efficiency, reduce grafting cost.