47results about How to "Stable cross-linked structure" patented technology

The invention discloses hydrogel with a self-repairing function and a preparation method of the hydrogel. The hydrogel is a hydrophobic unit-UPy (ureido pyrimidinone)-PEG (polyethylene glycol)-UPy-hydrophobic unit polymer. According to the preparation method, firstly, an intermediate Br-PEG-Br and a quadruple hydrogen bonding unit intermediate UPyMA are synthesized and then are copolymerized with hydrophobic units such as butyl acrylate, styrene, methacrylate containing 3-10 carbon and the like, and a target polymer is obtained. The hydrogel has high water-retaining property, varieties of hydrogel with better performance can be prepared by adjusting the proportion of hydrophilic and hydrophobic chain segments in the polymer or changing the variety of a hydrophobic monomer, and the application range is enlarged.

The invention belongs to a mesoporous carbon material, and particularly relates to a method for preparing a transition metal doped mesoporous carbon material with high specific surface area. The method takes a transition metal doped polymer as a carbonization precursor, takes a block polymer as a pore former, and utilizes a supramolecular self-assembly structure formed by the carbonization precursor and the pore former in a volatile solvent to cure at certain temperature in the existence of a curing agent to form a transition metal doped polymer meso-structure. A transition metal doped mesoporous polymer material can be prepared by roasting to remove the pore former under inert atmosphere. The prepared transition metal doped mesoporous polymer material is subjected to high-temperature carburization in the inert atmosphere to obtain the transition metal doped mesoporous carbon material.

The invention provides a preparation method for a waterborne PMMA composite coating diaphragm. The coating diaphragm is formed by coating one side or two sides of a polyolefin base membrane with mixed paste of modified PMMA and ceramic in one time; and the modified PMMA is obtained by performing crosslinking and modifying on the PMMA and a copolymer thereof by a crosslinking agent based on a certain proportion. The diaphragm is prepared from the mixed materials of the modified PMMA and the copolymer thereof and ceramic in a coating manner; and the coating layer only needs coating of one time, so that production cost is lowered, ventilation loss caused by thickness of the coating layer also can be lowered, and meanwhile, the thermal stability of the diaphragm is improved.

The invention belongs to the technical field of flame retardance of high polymer materials, and provides a flame retardant complex system and a halogen-free flame-resistant resin-based composite material containing the same. Reasonable complexing of alkyl hypophosphite, phosphite, alkoxy organosilicon and other low corrosion flame-retardant synergists is used to ensure that the final material is free of the problem of precipitation, the appearance is not influenced, processing equipment generates no precipitation residue, and an air vent is not blocked, the corrosion problem is well improved,adverse effect on the intrinsic beneficial properties is reduced remarkably, injection temperature is normal without serious decomposition, workpieces of various sizes are suitable for injection molding, adding amount is less and cost controllability is high.

The invention discloses a conductive polymer aerogel and a preparation method thereof. The preparation method comprises the following steps: polymerizing polyaniline in a low-ester pectin water solution, and then inducing to form an aquagel, carrying out solvent washing, and carrying out freeze-drying or supercritical drying. The aerogel is prepared by performing hydrogen bond crosslinking on 20-80 wt% of polyaniline and the balance of low-ester pectin with excellent mechanical properties. The method has the advantages of abundant raw material sources and low price. The obtained aerogel has the advantages of excellent mechanical properties, high conductivity, low density, high specific area and the like, and has favorable application prospects in the fields of energy storage materials, intelligent response, data storage and the like.

The invention discloses a preparation method of a crosslinked nanodrug based on an active reaction type one-step method. The preparation method specifically comprises the following step: adding a polymer and a drug with sulfydryl into a solution to be mixed to dialyze to obtain a crosslinked nanodrug, wherein the side chain of the polymer contains a dithiolane structure. The circularly stable nanodrug can be obtained by simple preparation, so that the defects that in the prior art, a chemically bonded nanodrug is complex to prepare and needs a catalyst and the like are overcome. The product prepared by the invention has a stable crosslinking structure and avoids the problem that an existing chemically bonded nanodrug is not crosslinked; and on a B16F10 melanoma-loading model, the nanodrug shows a good curative effect, and the tumor inhibition rate exceeds 90%. The active targeted crosslinked nanodrug has a huge potential application in the field of cancer chemotherapy.

The invention provides an organic-inorganic composite type high-temperature proton exchange membrane used for a fuel cell and a preparation method for the proton exchange membrane, and belongs to the field of high polymer chemistry and high-temperature proton exchange membrane fuel cells. The proton exchange membrane is prepared from the following components based on weight percentages: 3-12% of ionic liquid functionalized silicon dioxide precursor and 88-97% of siloxane side base-containing polybenzimidazole; and the structural formulas of the ionic liquid functionalized silicon dioxide precursor and the siloxane side base-containing polybenzimidazole are as shown in the formulas I and II as follows respectively. The invention also provides the preparation method for the organic-inorganic composite type high-temperature proton exchange membrane used for the fuel cell. The proton conductivity of the organic-inorganic composite type high-temperature proton exchange membrane at a temperature of 170 DEG C is 0.050-0.075S/cm; and the thickness of the organic-inorganic composite type high-temperature proton exchange membrane is 30-50[mu[m.

The invention discloses a carbon-based lithium adsorbent particle for liquid lithium resource extraction. No adhesive needs to be added in the forming process of the adsorbent particles, and carbon has a fixing effect on adsorbent powder; the size is stable, and swelling is avoided in long-term use in strong acid, strong alkali and water; strong acid resistance and strong alkali resistance are achieved, and lithium adsorption under the alkaline condition and desorption operation under the acidic condition can be met; the carbon-based particles have pore structures and can exchange with a solution in the adsorption and desorption process, so that the efficiency is improved. Another purpose of the invention is to provide a preparation method of carbon-based adsorbent particles extracted from liquid lithium resources, and the preparation method comprises the following steps: carrying out extrusion granulation on water-absorbent resin, preparing high-strength water-absorbent particles by using a secondary cross-linking process, and carbonizing the high-strength water-absorbent particles to prepare carbon-based adsorbent particles; the invention also aims to provide a preparation device of the carbon-based adsorbent particles for extracting the liquid lithium resource. The preparation device has the advantages that one set of equipment can be used for producing various products, continuous production can be realized, and the like.

The invention discloses a printing method of a DLP photocuring printer. The printing method comprises the following steps that 1, a digital 3D model of a to-be-printed object is established; 2, the digital 3D model is subjected to slicing treatment, and multiple layers of model slices are obtained, wherein the number of the model slices is n; and 3, printing is started from the bottom end to the top end of the digital 3D model from the first layer according to the model slices, wherein the number of the current printing layers is m, the exposure time is h, and h is 1s. According to the printing method, through a digital 3D model processing system, during specific using, the sectional area of the current printing model slice and the sectional area of the upper layer of model slice can be compared through a sectional area comparison unit in the digital 3D model processing system, if the sectional area of the current printing model slice is smaller than the sectional area of the upper layer of model slice, the cross-linked structure of the two layers of slices is relatively stable, thus, the exposure time can be properly shortened, the printing time of a complex model is greatly shortened, and the printing efficiency is improved.

The invention relates to the technical field of waterproof paint for zippers and in particular relates to polyurethane flash waterproof paint for zippers and a preparation method of the polyurethane flash waterproof paint. The waterproof paint comprises polyether polyol, isocyanate, polyamide-flash beads, a chain extender, a catalyst, an active diluent monomer, a photoinitiator, a flatting agent and deionized water, wherein the polyamide-flash beads are composed of flash beads and a polyamide layer coating the flash beads. According to the waterproof paint disclosed by the invention, the flashbeads are coated by adopting the polyamide, so that the flash beads are uniformly dispersed in deionized water. The polyamide layer has many hydroxide radicals and can perform cross-linking polymerization with isocyanate, carbon-carbon double bonds in the polyamide layer can also carry out a polymerization reaction with the active diluent monomer, so that the stability of the polyamide-flash beads in the paint is improved. The coating can achieve excellent waterproof property and mechanical property, and the ornamental value is high.

The invention provides a high-performance asphalt pavement regenerant and a preparation method thereof. The high-performance asphalt pavement regenerant is prepared from, by weight, 60-70 parts of anactivating component, 5-10 parts of a permeating component, 10-15 parts of a plasticizing component, 8-15 parts of a modifying component and 3-6 parts of an anti-aging component, and the sum of the weight parts of the raw materials is 100 parts. According to the invention, the synergistic combination of thermal stability substances is used as an activating component to replace the traditional aromatic hydrocarbon oil activating component, so that the thermal stability of the regenerant can be greatly improved, and the long-term aging performance of the regenerated mixture can be improved. Theselected surfactant enables the asphaltene association structure to be deassociated, and dissolution and dispersion of asphaltene are promoted. The preparation process is simple, raw materials are wide in source, starting from the asphalt aging mechanism, activation and performance blending of aging components are considered, and the prepared regenerant is excellent in pavement performance and wide in application prospect.

The invention relates to mildew-proof wear-resistant environment-friendly PVC artificial leather and a preparation method thereof. The PVC artificial leather comprises a base cloth layer and a PVC surface layer attached to the base cloth layer. The PVC surface layer is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 20-30 parts of a functional elastomer, 50-70 parts of a plasticizer, 12-20 parts of coconut shell powder modified vermiculite powder, 4-12 parts of a cross-linking agent, 1-5 parts of a heat stabilizer, 1-3 parts of an antibacterial agent and 0.2-4 parts of a foaming agent. Compared with the prior art, the PVC artificial leather disclosed by the invention does not contain any volatile solvent, is good in environmental protection property, smooth in hand feeling, strong in stereoscopic impression and high in glossiness quality, has excellent mould-proof, antibacterial and wear-resistant scratching properties, is plump in hand feeling like real leather, has physical properties reaching test standards, and is long in service life; the problems that existing PVC leather is prone to aging, mildewing, peeling and the like can be effectively solved, and high economic practicability is achieved.

The invention provides a preparation method of fibroin/temperature-sensitive cellulose fabric. The preparation method comprises the following steps: S1, preparing oxidized cellulose; S2, preparing a fibroin aqueous solution; S3, preparing fibroin/cellulose composite porous microspheres; S4, preparing a phase change material; S5, preparing a composite phase change material; and S6, preparing the temperature-sensitive fabric. According to the fibroin/temperature-sensitive cellulose fabric provided by the invention, fibroin/cellulose microspheres loaded with a phase-change material are finished on the fabric, so that the temperature of the fabric is intelligently controlled under a certain temperature condition.

The invention relates to a foundation strengthening method. The foundation strengthening method comprises the following steps that firstly, foundation hole drilling is conducted, the lower end of a floral tube is inserted in a foundation hole, and the lower section of the foundation hole is filled with coarse sand to be compacted, wherein a plurality of holes are evenly distributed in the tube wall of the floral tube; secondly, a water glass solution and cement paste are injected into the bottom of the floral tube through a first inner casing pipe, and the bottom end of the floral tube is cured in the foundation hole; thirdly, chambering is conducted on the upper portion of the foundation hole, an expanding hole is formed, and then grouting discs sequentially sleeve the part, located at the expanding hole, of the floral tube at equal intervals; fourthly, the expanding hole is filled with coarse sand; fifthly, a second inner casing pipe is used for sequentially pumping the high-pressurewater glass solution into various grouting discs, the water glass solution is outwards scoured and diffused through a grouting pipe, and then the second inner casing pipe is pulled out; and sixthly,the cement paste is injected into the floral tube, part of the cement paste is outwards diffused through the grouting pipe and makes contact with the water glass solution, the other part directly enters the coarse sand in the expanding hole through the holes in the floral tube, and work is finished after cement paste liquid curing.

This invention discloses a macromolecule heat sensitive resistance and its process method, whose base slice element and weight percentage as the following: polymer 30-65; conductive stuff 30-60; inorganic stuff10-40; processed assistant agent 0.2-5, wherein, the conductive stuff is nickel powder, copper powder or carbon and the inorganic stuff is metal oxidation and the processed assistant agent comprises anti-oxidant agent and the couple agent mixture with the weight proportion as 1: 1.5-2.5, wherein, the couple agent is titanium acid ester or silicon alkyl compound composed of base slice and slice electrode and the lead wire electrode welded on the electrode surface and the insulation layer covered on the outer surface.

The invention discloses sweet tea suitable for diabetics to drink. The sweet tea is prepared by the following steps: S1, taking siraitia grosvenorii seeds, and punching a plurality of blind holes in the siraitia grosvenorii seeds by using a first punching needle; and S2, taking a second punching needle, wherein the diameter of the second punching needle is smaller than that of the first punching needle, an air hole is formed in the side portion of the second punching needle, an elastic film bag is arranged on the side portion of the second punching needle in a sleeved mode, the second punchingneedle is soaked in slow-release gel containing gingerol first and then inserted into the blind holes of fructus momordicae seeds, ventilation is performed, gas are exhausted from the air hole, the volume of the film bag is enlarged to be attached to the edges of the blind holes, and ventilation is stopped, and then the second punching needle and the film bag are taken out. The sweet tea preparedby the method disclosed by the invention can meet the requirements of diabetics for eating desserts, and also can help to control blood sugar to a certain extent.

The invention discloses a synthetic method of amphoteric polyacrylamide, a reinforcing agent for waste paper recovery and papermaking and a preparation method of the reinforcing agent. The amphoteric polyacrylamide is obtained through an initiation reaction on the basis of acrylamide. The reinforcing agent for waste paper recovery and papermaking comprises the amphoteric polyacrylamide and a glyoxal urea polymer in a weight ratio of 1: (1-3). The reinforcing agent provided by the invention can obviously improve the strength of paper.

The invention discloses a curing agent for high-strength polymer grouting and a preparation process of the curing agent. The curing agent comprises the following raw materials in parts by weight: 20-30 parts of a first component, 23-25 parts of a second component, 30-40 parts of formaldehyde, 30-50 parts of melamine, 50-60 parts of deionized water and 0.1-0.3 part of span 20. The preparation process comprises the following steps: 1, preparing the first component and the second component; 2, uniformly mixing formaldehyde, melamine and deionized water to obtain a mixed solution, adjusting the pH value of the mixed solution, setting the temperature to be 70-80 DEG C, and carrying out stirring for 50-60 minutes to obtain a prepolymer solution for later use; and 3, stirring the first component, the second component and span 20 at room temperature for 5-10 minutes, adding the prepolymer solution prepared in the step 2, setting the temperature to be 60 DEG C, regulating the pH value of the reaction solution, stirring for 2 hours, and regulating the pH value of the system after stirring is finished, thereby obtaining the curing agent for high-strength polymer grouting.

The invention relates to a halogen-free intumescent flame retardant EVA and a preparation method thereof. The material comprises in mass percent: 50%-80% of an EVA base material, 15%-30% of a halogen-free intumescent flame retardant, 0%-0.2% of an anti-dropping agent, 0-0.5% of an antioxidant, and 0-2% of a lubricant. The halogen-free intumescent flame retardant consists of an organic-metal triazine hybrid SCTCA@ZnO as a carbon source and a gas source, and an acid source, and the mass ratio of a char forming agent to the acid source is 1:1-4:1. The halogen-free intumescent flame retardant is especially suitable for the halogen-free flame retardant of polyolefin materials, shortcomings that low flame retardant efficiency, large additive amount and the like of existing intumescent flame retardants are overcome, the adverse effects of the flame retardant on the mechanical properties of the matrix are reduced, and the production and use are very convenient. The halogen-free intumescent flame retardant EVA composite material has high flame retardant efficiency, no halogen, low smoke and low toxicity, and has excellent processing properties, so that the material can be widely used in many fields such as electronics and electronic appliances, automotive components and parts and the like.