143 results about "Benzyl ether" patented technology

The invention concerns a radiopaque, non-biodegradable, water-insoluble iodinated benzyl ether of poly(vinyl alcohol) consisting of a PVA having covalently grafted thereon iodinated benzyl groups comprising 1-4 iodine atoms per benzyl group, a process for preparing the same comprising reacting a 0-100% hydrolyzed PVA with a iodinated benzyl derivative comprising 1-4 iodine atoms per benzyl group in a polar aprotic solvent in the presence of a base in anhydrous conditions. Said iodo-benzylether-PVA is particularly useful as embolic agent in an injectable embolizing composition. The invention also concerns an injectable embolizing composition comprising said iodo-benzylether-PVA and capable of forming a cohesive mass upon contact with a body fluid by precipitation of the iodo-benzylether-PVA. Said injectable embolizing composition is particularly useful for forming in-situ a cohesive mass in a blood vessel or into a tumor. The invention further concerns a coating composition containing said iodo-benzylether-PVA and capable of forming a radiopaque coating on a medical device. The invention further concerns particles formed of said iodo-benzylether-PVA.

The invention discloses an MXene/bimetal oxide composite material, a preparation method thereof and a lithium ion battery negative electrode material, and belongs to the technical field of preparationof a lithium battery electrode material. The preparation method comprises the steps of firstly, uniformly mixing a transition metal carbon/nitride thin film and two types of acetylacetone metal salts, and dissolving the mixture in a benzyl ether solvent to obtain a precursor solution; secondly, achieving pyrolysis of the acetylacetone metal salts by an in-situ pyrolysis method, and growing a bimetal oxide on a surface of the transition metal carbon/nitride thin film; and finally, obtaining the MXene/bimetal oxide composite material after ultrasound centrifugal cleaning on a mixed liquid of n-hexane and alcohol. When the composite material is applied to the lithium ion battery negative electrode material, relatively good structural stability and uniformly are shown; and through electrochemical performance test, the composite electrode has relatively high energy density, cycle stability and rate performance.

The invention discloses an epoxy resin bi-component binding agent system modified by polyurethane. The epoxy resin bi-component binding agent system is characterized in that the binding agent system blows gaseous sulfur dioxide for solidification, and the binding agent system comprises the following components in percentage by weight: (a) 1 to 40 parts of benzyl ether phenolic resin; (b) 0.1 to 10 parts of polymeric isocyanate; (c) 40 to 80 parts of epoxy resin; (d) 20 to 30 parts of acrylate; (e) 1 to 30 parts of high boiling ester and/or hydrocarbon thinners; and (f) 15 to 75 parts of organic peroxide. The epoxy resin bi-component binding agent system modified by polyurethane overcomes the disadvantages in the prior art that cold box binding agents adopting sulfur dioxide for blowing hardening have fragility and bad temperature resistance, can improve the strength of a sand core and a sand mold during the casting and using process, reduces the rejection rate, and improves the casting quality.

The invention discloses a high-ortho benzyl ether phenolic resin and a preparation method thereof, and a method for applying the high-ortho benzyl ether phenolic resin to a cold box binder, belonging to the technical field of phenolic resin. The high-ortho benzyl ether phenolic resin contains more than 27% of a hydroxymethyl group. The high-ortho benzyl ether phenolic resin is prepared by adding a molten phenol mixture, paraformaldehyde and a composite catalyst into a reaction vessel, selecting a proper mol ratio of phenolic to aldehyde and carrying out reaction under certain conditions. The prepared high-ortho benzyl ether phenolic resin has high hydroxymethyl content and realizes rapid reaction and curing with isocyanate radicals of isocyanate under the catalysis of amine, so normal-temperature strength of the resin is improved. Compared with the prior art, the high-ortho benzyl ether phenolic resin provided by the invention has the following advantages when applied to non-ferrous casting: under the condition that normal-temperature strength of a resin sand core is guaranteed, the usage amount of the resin is greatly reduced; collapsibility of the resin sand core is improved; the residual quantity of tar on a metal die is decreased; and production efficiency is improved.

The invention provides an adhesive for casting. The adhesive is prepared from benzyl ether phenolic resin, polyisocyanate, epoxy resin, acrylic ester, an organic compound and graphene through reaction, wherein the organic compound comprises one or several of a diacid diol ester type compound, an alcohol type compound and a hydrocarbon compound. The invention provides a preparation method for the adhesive for casting. The preparation method comprises the steps of performing reaction on benzyl ether phenolic resin, polyisocyanate, epoxy resin, acrylic ester, an organic compound and graphene to obtain the adhesive for casting; and the organic compound comprises one or several of the diacid diol ester type compound, the alcohol type compound and the hydrocarbon compound. A casting mold or a casting core prepared by the adhesive for casting, which is provided by the invention, is relatively long in high-temperature heat resistance time and relatively high in high-temperature heat resistance strength.

The invention discloses an amino sugar thiazole derivative as well as a synthetic method thereof. When synthesis is carried out, glucosamine hydrochloride is taken as a raw material, and benzyl ether protection is carried out on hydroxy, so that the selective reaction of amino is realized, a novel intermediate glycosyl thiourea-N-(1,3,4,6-tetra-0-benzyl-2-deoxygenation- beta-D-glucopyranose-2-group) thiocarbamide is synthesized, and glycosyl thiazole-N-(1,3,4,6-tetra-0-benzyl-beta-D-glucopyranose-2-group)-2-amido-4-substituted thiazole is synthesized by cyclizing the novel intermediate glycosyl thiourea-N-(1,3,4,6-tetra-0-benzyl-2-deoxygenation beta-D-glucopyranose-2-group) thiocarbamide with 1-bromine-2-substituted ethyl ketone. The synthetic method disclosed by the invention has the advantages of easiness and safety for operation, wide application scope, low cost of the raw material, easiness for raw material obtaining, easiness and convenience for post-processing and high yield, is a fast high-efficiency synthetic method and has a wide application prospect on the aspect of preparing an acetylcholinesterase resistant drug because the synthesized compound has high inhibiting effect on acetylcholinesterase.

The invention relates to a contrast agent and particularly relates to a dual-mode synergistically-enhanced magnetic-resonance contrast agent and a method for synthesizing the same. The dual-mode synergistically-enhanced magnetic-resonance contrast agent is synthesized in one pot by taking the compound of a contrasting material T1 and a contrasting material T2 as a reaction precursor. The method comprises the following steps of: dissolving gadolinium oleate or gadolinium acetylacetone and ferric oleate or ferric acetylacetonate into octadecene or benzyl ether, adding oleic acid, heating an obtained solution, carrying out reflux reaction to obtain a reaction solution, cooling to room temperature, adding a first solvent to precipitate a product of reaction, centrifuging, removing a supernate, and dissolving a precipitate into a second solvent. The method is simple in steps, is convenient to operate, ensures high yield and is suitable for large-scale preparation. The idea of doping and synthesizing ensures that the field directions of the contrasting material T1 and the contrasting material T2 are parallel and same in the external magnetic field. The dual-mode contrast agent synthesized from the contrasting material T1 and the contrasting material T2 has the capacity of making two imaging modes complementary to each other and can obtain two imaging results nearly at the same time in the same place under the same resolution.

The invention provides a curable resin composition with high dielectric property (low dielectric constant. low dielectric loss tangent) and having condensates with high glass-transition temperature and flame resistance, bis (methyl) acryloyl tail end benzyl ether compound and aromatic bis-halogenated methyl compound as an intermediate. Aromatic bis-halogenated methyl compounds are reacted with bisphenol fluorene compounds, and the obtained aromatic bis-halogenated methyl compounds with halogenated methyl groups at two tail ends are employed as intermediates. Next, the intermediates are reacted with compounds of (methyl) acrylic acid series such as (methyl) acrylic acid, (methyl) potassium acrylate and the like, thus the halogenated methyl groups at two tail ends are changed into (methyl) acryloyl groups and bis (methyl) acryloyl tail end benzyl ether compounds are obtained. In addition, the invention relates to a curable resin composition comprising bis (methyl) acryloyl tail end benzyl ether compounds and polymerization initiators (B).

The invention discloses an epoxy resin double-component adhesion agent system prepared by using a cold box process. The epoxy resin double-component adhesion agent is characterized in that the adhesion agent system blows gaseous sulfur dioxide to cure. The adhesion agent system comprises the following components in parts by weight: (a) 1-40 parts of benzyl ether phenolic resin; (b) 0.1-10 parts of polyisocyanate; (c) 40-80 parts of epoxy resin; (d) 20-30 parts of acrylate; (e) 1-30 parts of ester with a high boiling point and/or a hydrocarbon diluent; and (f) 15-75 parts of organic peroxides. The weight-average molecular weight of the benzyl ether phenolic resin is in a range of 500-2000. With the adoption of the adhesion agent system, the defects that the cold box adhesion agent for curing the sulfur dioxide by blowing in the prior art has poor brittleness and poor temperature resistance can be overcome, so that the strength of a core sand mould is improved in a casting process of the core sand mould; the rejection ratio is reduced; the quality of a casting piece is improved; and meanwhile, the viscosity of the adhesion agent is reduced. The epoxy resin double-component adhesion agent system is beneficial to a casting process.

The invention discloses a zinc ferrite material and a preparation method thereof, and belongs to the field of magnetic materials. The preparation method comprises the following steps of preparing materials, wherein raw materials comprise ferric acetylacetonate, zinc acetylacetonate, a surfactant and a solvent, the solvent is benzyl ether or 1-octadecene or oleylamine, the mole ratio of the zinc acetylacetonate to the ferric acetylacetonate is 0.1-0.8, the mole ratio of the total amount of the ferric acetylacetonate and the zinc acetylacetonate to the surfactant is 0.01-0.85, and the quantity of the solvent is determined in a manner that the ferric acetylacetonate and the zinc acetylacetonate can be fully dissolved by the solvent; placing the raw materials in protective gas environment, and performing uniform mixing at room temperature; and then performing low-speed warming, performing quick-speed warming, and performing cooling so as to obtain resultant granules namely the zinc ferrite material. The zinc ferrite material prepared by the method disclosed by the invention has extra-high saturation magnetization intensity, and can maintain favorable magnetic properties after being subjected to high temperature calcination.

The invention discloses a preparation method of highly-pure benzyl aryl ether 4-(3-fluorobenzyloxy)-benzaldehyde and a derivative thereof. The method is characterized in that the benzyl aryl ether 4-(3-fluorobenzyloxy)-benzaldehyde and the derivative thereof are prepared through condensation of a benzyl derivative and p-hydroxybenzaldehyde in the presence of an organic alkali. The method has the characteristics of mild reaction conditions, simplicity in operation, good reaction selectivity, high product purity, and easy realization of industrial production.

The invention discloses a method for synthesizing triphenyl-phosphonium bromide salt and an intermediate halomethyl benzyl ether compound thereof. The method comprises the following steps that at a temperature of between 10 DEG C below zero and 10 DEG C, hydrogen chloride or hydrogen bromide and benzyl alcohol compound react with paraform to synthesize the halomethyl benzyl ether compound, and then the halomethyl benzyl ether compound reacts with triphenyl-phosphonium bromide in a solvent to obtain the triphenyl-phosphonium bromide salt compound. The method solves the problems that the purity of the halomethyl benzyl ether compound prepared at a temperature of between 20 DEG C and 25 DEG C by the prior method is low, and in the purification process, the intermediate is decomposed, which results in the low yield of the triphenyl-phosphonium bromide salt at the end. The triphenyl-phosphonium bromide salt and the intermediate halomethyl benzyl ether compound which are prepared by the method have the advantages of higher yield and purity without purification, simple process, convenient operation and higher industrial application value, and are easy to be applied to industrial scale production.

Purified alkoxylated sucrose esters of the formula:

wherein R is independently selected from: COR′; CH₂CH₂O)_xH; and (CH₂CH₂O)_x COR′; wherein R′ is a fatty acid compound having from about 2 to about 28 carbon atoms; and wherein x is a number selected from about 1 to about 50; wherein at least one of the R groups is an ester group that is directly esterified to the sucrose backbone; and wherein the alkoxylated sucrose ester composition further comprises: less than 1% aldehydes; less than 1% ketones; less than 1% benzyl halide; less that 1% mono-benzyl ether; less than 1% acetals; and less than 1% ketals.

The invention provides a process for preparing 3-benzyloxy-4-butylaniline hydrochlorides, which comprises using m-aminophenol as raw material, carrying out butanoylation reaction and Fries rearrangement, obtaining 2-butyryl-5-butyramidophenol, under the action of alkali, reacting 2-butyryl-5-butyramidophenol with benzyl halides, obtaining 2-butyryl-5-butyramidophenyl benzyl ether, hydrolyzing to obtain 3-benzyloxy-4-butyryl benzeneamine, finally carrying out Huangminglong reduction reaction to obtain 3-benzyloxy-4-butylaniline hydrochlorides.

The invention provides an underwater concrete flexible epoxy anticorrosion paint and a preparation method thereof. The paint comprises a component (A) and a component (B). The component (A) comprisesepoxy resin E-51, epoxy resin E-44, flexible polyurethane epoxy resin 102C-4L, epoxy propane benzyl ether, trimethylolpropane glycidyl ether, organic bentonite, polyamide wax, and wollastonite powder.The component (B) is a special H-2303 underwater curing agent. Through the synergistic effect of multiple components, the prepared anticorrosion paint is easy for underwater construction, after underwater painting and curing, the bonding force between the coating and the concrete is strong, and the coating is resistant to corrosion. Modified flexible polyurethane resin is adopted, an active diluent, which can enhance the flexibility of cured substances, is added, and thus the flexibility of cured coating is good. The problems that common epoxy resin is brittle after curing and the impact resistant performance of common epoxy resin is bad are solved. The provided paint is suitable for the anticorrosion protection of concrete structures such as underwater bridge piers, concrete dam faces, splash zones, and the like.

Silicone free cosmetic hair treatment preparation provided for rinsing after the application, comprises polypropylene glycol-3 benzyl ether myristate and amphoteric surfactants (0.0001-1 wt.%).

One aspect of the present invention relates to optionally substituted halogenated benzyl halides and the like. These compounds are useful as halogenated benzyl ether-based protecting groups for a variety of functional groups. Another aspect of the present invention relates to use of said protecting groups in an orthogonal protecting group strategy for the synthesis of complex molecules that comprise a number of suitable functional groups. Another aspect of the present invention relates to saccharides bearing various arrays of protecting groups of the present invention. Another aspect of the present invention relates to a method of synthesizing an oligosaccharide or glycoconjugate, comprising the steps of: using a saccharide bearing at least one protecting group of the present invention to glycosylate a second molecule to give a product comprising said saccharide; and removing a protecting group of the present invention from said product.

The invention belongs to the field of chemical analysis and detection, and particularly discloses a water-soluble two-photon fluorescent probe capable of being directly used for detecting benzoyl peroxide in flour, cancer cells and tissues and a preparation method and application thereof. The fluorescent probe adopts coumarin derivatives with a two-photon property as a signal group and the p-phenylborate benzyl ether as a response recognition group of BPO. The structure of the fluorescent probe is represented by a formula (I). The fluorescent probe has good water solubility, high selectivity,superior anti-interference ability and high sensitivity, can be directly used for rapid detection of BPO in the flour, cancer cells and tissues, and has good application prospects.

The invention discloses a cold-core-box-method epoxy resin single-component binder which is used for sulfur dioxide blowing solidification in the absence of an organic peroxide activating agent. The binder comprises by weight (a) 1 part to 40 parts of benzyl ether phenolic resin, (b) 0.1 part to 10 parts of polyisocyanate, (c) 40-77 parts of epoxy resin, (d) 10-30 parts of acrylate and (e) 1 part to 30 parts of high-boiling-point ester and/or hydrocarbon diluent. The weight-average molecular weight of the benzyl ether phenolic resin is between 500 and 2000. The binder overcomes the shortcoming in the prior art that the binder for sulfur dioxide blowing solidification is poor in fragility and humidity resistance, improves strength of sand cores and sand types in the casing process, simultaneously reduces viscosity, and is favorable for the casting process.

The invention provides an electrochemical synthesis method of a 2-substituted benzothiazole compound. The method comprises the following steps of: (1) adding an electrolyte, a manganese salt catalyst,an electrolytic solvent, a benzyl ether compound and o-aminothiophenol into a diaphragm-free electrolytic tank, inserting an anode and a cathode, and carrying out electrochemical reaction under stirring, electrifying and constant-current conditions; and (2) after the reaction is finished, extracting the reacted solution, and performing separation and purification to obtain the 2-substituted benzothiazole compound. According to the invention, in a diaphragm-free single-chamber electrolytic tank, the benzyl ether compound and o-aminothiophenol are used as the raw materials to acquire the 2-substituted benzothiazole compound under the conditions of normal temperature, normal pressure and constant current; wherein the manganese salt is low in price, a peroxidant does not need to be additionally added in the synthesis process, the reaction conditions are mild and safe, the product yield is high, the production cost is low, meanwhile, the environmental pollution is small, the requirements of green chemistry are met, and a feasible scheme is provided for industrialization of the 2-substituted benzothiazole compound.

The invention relates to a high-power white-light LED packaging technology, in particular to a fluorescent powder coating process. The fluorescent powder coating process comprises the following steps: preparing a positive photoresist based on phenolic resin; preparing a fluorescent powder gum with the photoresist; coating the fluorescent powder gum; exposing and developing; and hardening. According to the high-power white-light LED fluorescent powder coating method, the phenolic resin as an organic component is taken as a film forming agent, azo naphthoquinone and derivates thereof or a diazo compound or orthodiazonaphthoquinone is taken as a photosensitizer, acetic acid propylene glycol benzyl ether ester is taken as a solvent, the high-temperature-resistant positive photoresist is prepared, the photoresist is uniformly mixed with fluorescent powder and silica gel/epoxy resin according to a certain ratio so as to prepare the fluorescent powder gum of the photoresist based on the phenolic resin, and a fluorescent powder layer with uniform thickness is formed on the surface of an LED chip through processes of coating, exposing by aligning, developing and hardening, so that the LED emergent light uniformity is improved, the LED space light color difference is reduced, and a device is not influenced by a high temperature in a subsequent packaging process.