2651 results about "Phenolic aldehyde" patented technology

Digestion of cellulosic biomass solids may be complicated by lignin release therefrom, which can produce a highly viscous phenolics liquid phase comprising lignin polymer. Methods for digesting cellulosic biomass solids may comprise: providing cellulosic biomass solids in the presence of a digestion solvent, molecular hydrogen, and a slurry catalyst capable of activating molecular hydrogen; at least partially converting the cellulosic biomass solids into a phenolics liquid phase comprising lignin, an aqueous phase comprising an alcoholic component derived from the cellulosic biomass solids, and an optional light organics phase; wherein at least a portion of the slurry catalyst accumulates in the phenolics liquid phase as it forms; and reducing the viscosity of the phenolics liquid phase.

A permanent photoresist composition comprising: (A) one or more bisphenol A-novolac epoxy resins according to Formula I; wherein each group R in Formula I is individually selected from glycidyl or hydrogen and k in Formula I is a real number ranging from 0 to about 30; (B) one or more epoxy resins selected from the group represented by Formulas BIIa and BIIb; wherein each R₁, R₂ and R₃ in Formula BIIa are independently selected from the group consisting of hydrogen or alkyl groups having 1 to 4 carbon atoms and the value of p in Formula BIIa is a real number ranging from 1 to 30; the values of n and m in Formula BIIb are independently real numbers ranging from 1 to 30 and each R₄ and R₅ in Formula BIIb are independently selected from hydrogen, alkyl groups having 1 to 4 carbon atoms, or trifluoromethyl; (C) one or more cationic photoinitiators (also known as photoacid generators or PAGs); and (D) one or more solvents.

The invention provides a novel epoxy coating and a preparation method thereof. The coating not only has excellent corrosion resistance, but also has excellent compatibility with a base material or a lower coating film, particularly an epoxy coating, a polyurethane coating, a fluorocarbon coating or an alkyd resin coating. The epoxy coating comprises a main paint and a curing agent, wherein the main paint contains bisphenol A epoxy resin and modifying resin for modifying the bisphenol A epoxy resin; and the curing agent contains polyamino amide and cardanol modified phenolic amine.

The invention relates to an environment-friendly double-component epoxy anticorrosion primer without containing heavy metals such as chromium and the like. The primer is prepared from components A and B, wherein the component A contains bisphenol A epoxy resin, active dilute, tinting pigment, antirust pigment, filler, auxiliary agent, mixed solvent and the like; and the component A is a curing agent component and contains two cashew nut shell modified phenolic aldehyde amine curing agents with different amine values and a mixed solvent. During use, the components A and B are mixed in a weightratio of 5 to 1. The anticorrosion primer does not contain the heavy metals such as chromium and the like, and meanwhile has excellent anticorrosion performance, physical and mechanical properties, salt mist resistance and acid and alkali resistance. The primer is particularly suitable for coating steel materials, aluminum materials, aluminum alloy and the like, and can be used as a surface anticorrosion primer for airplanes, rapid trains and the like with high anticorrosion requirements. The primer can be normally constructed even at the low temperature of 5 DEG C below zero, and has excellent matching property with finishing paint.

The invention discloses metal base material corrosion-resistant coating and a preparation method thereof. The metal base material corrosion-resistant coating comprises the following components in parts by weight: 25 to 30 pats of epoxy modified organic silicon resin, 15 to 20 parts of modified vinyl resin, 1 to 2 parts of nano material, 1 to 3 parts of corrosion-resistant particulate filler, 15 to 18.5 percent of pigment and filler, 1 to 2 parts of antisettling agent, 0.3 to 0.5 part of dispersing agent, 0.5 to 0.8 part of stabilizing agent, 3 to 4 parts of aid and 23 to 26 parts of solvent, wherein the modified vinyl resin comprises according to the weight percentage 50 to 70 % of phenolic aldehyde epoxy vinyl ester resin and 30 to 50 % of flexible vinyl ester resin. The metal base material corrosion-resistant coating is prepared by multiple flows of weighing the raw materials in parts by weight, mixing the raw materials according to certain sequence, dispersing, grinding and the like. The metal base material corrosion-resistant coating has high temperature tolerance, wet resistance, corrosion resistance, weldability and constructability and can be applied in the technical fieldsof processing of various different metals.

The invention provides a preparation method for phenolic adhesive based on lignin phenolization liquid and application thereof. Under the condition of normal pressure heating or thermalcatalysis, phenol is taken as liquefaction reagent, lignin is added, the temperature is raised to 90 to 150 DEG C, the thermal insulation liquefaction reaction is made to cool to obtain a lignin liquefaction product; basic catalyst and formaldehyde are directly added into the liquefaction liquid, the temperature is raised to 70 to 97 DEG C under normal pressure to react for 1 to 3 hours, the reaction is terminated when the viscosity is measured to meet the preset requirement, and low-free formaldehyde environmental protection type phenolic adhesive based on lignin phenolization liquid is obtained. The adhesive obtained by the invention has lower cost and lower content of free formaldehyde than the prior phenolic resin adhesive. The plywood pressed by using the adhesive obtained by the invention has good bonding performance.

The invention discloses a tyre crown rubber material. The tyre crown rubber material comprises the following raw materials in parts by weight: 60-80 of natural rubber, 20-40 of butadiene rubber BR9000, 0-0.4 of peptizer, 10-30 of intermediate super abrasion furnace black, 25-45 of white carbon black, 3-7 of silane coupling agent, 3-5 of zinc oxide, 1-4 of stearic acid, 1-3 of antiager 6PPD, 0-2 of antiager RD, 1-3 of microcrystalline paraffin, 1-3 of sulfur, 1.5-2.5 of accelerator, 4-6 of fatty acid salt processing agent, 0-1 of anti-reversion agent, 2-5 of environment-friendly arene oil TDAE (Treated Distillate Aromatic Extract), 1-3 of octyl phenolic aldehyde tackifying resin and 0-0.3 of scorch retarder. When mixing is carried out in three sections, partial formula raw materials are subjected to rubber material mixing, and then other formula materials are added for rubber material mixing. The tyre crown rubber material produced by using the tyre crown rubber material formula is good in comprehensive processing property, has the characteristics of low thermogenesis, ageing resistance and tearing resistance and is environment-friendly and can be used for producing green full-steel radial tyre crown.

The invention discloses a low-shrinkage phenolic moulding compound, belonging to the technical field of thermosetting plastics. The low-shrinkage phenolic aldehyde moulding compound comprises the following raw materials in parts by weight: 20.0-35.0 parts of phenolic resin, 2.0-10.0 parts of thermosetting resin, 1.0-8.0 parts of curing agent, 0.2-2.0 parts of curing accelerator, 1.0-3.0 parts of lubricant, 30.0-50.0 parts of glass fiber, 1.0-10.0 parts of cotton fiber, 15.0-25.0 parts of nanoscale inorganic filler, 0.5-2.0 parts of coupling agent, and 0.5-4.0 parts of low shrinkage agent. In the technical scheme of the invention, the glass fibers and the cotton fibers are combined to improve mechanical strength, the strength and the shrinkage resistance of a material is improved completely by adopting the nanoscale inorganic filler and the adding the coupling agent and the low shrinkage agent, and the invention can meet the usage requirements of the industries of vehicles, electrical appliances, machineries and textiles on plastic products.

A medium temperature curing high temperature resistant phenolic adhesive relates to an adhesive. The invention solves technical problems of phenolic high curing temperature and weak temperature tolerance of adhesive. The adhesive of the present invention consists of modified phenolic resin solution, toughening agent, curing agent, heat-resistant reinforced resin and filler. The adhesive of the invention has a low curing temperature, can be cured at 100 DEG C and obtain good adhesive strength. Curing at 100 DEG C for 6 hours, the adhesive can reach shear strength of 13.5MP and still have shear strength of 2.3MPa at 1000 DEG C. The adhesive further conducts complex reaction in high temperature usage environment and generates product with better heat resistance, thereby realizing the echelon curing and echelon temperature resistance, which are difficult for other type of high temperature resistant glue to achieve.

The invention provides a fiber composite carbon aerogel material which comprises carbon aerogel and an inorganic fiber material, wherein the mass ratio of the carbon element to the inorganic fiber material in the carbon aerogel is 1:1-300. The invention also provides a method for preparing the fiber composite carbon aerogel material, which comprises the following steps: preparation of phenolic aldehyde solution, preparation of fiber composite phenolic aldehyde gel, aging of the fiber composite phenolic aldehyde gel, drying of supercritical fluid, reaction in an atmosphere cracking furnace, and the like. The fiber composite carbon aerogel material has the advantages of favorable moldability, good high temperature resistance, outstanding high-temperature heat-insulating property, low density and high compressive resistance; and the fiber composite carbon aerogel material can conduct electricity, be used as a catalyst carrier material, electrode material or high-temperature heat-insulating material, meet the special requirements for aviation, spaceflight, military affairs and other aspects, and be used in the civil field having high requirements for high-temperature heat-insulating property.

The invention discloses an alkylphenol modified phenolic amide curing agent and a preparation method thereof. The alkylphenol modified phenolic amide curing agent comprises the raw components including phenol or phenol derivatives, methanal or paraformaldehyde, polyamine and fatty acid or fatty acid polymer. The preparation method comprises the following steps of: uniformly mixing the fatty acid or the fatty acid polymer and the polyamine, heating the mixture, cooling the mixture, adding the phenol or the phenol derivatives in the mixture, uniformly mixing the methanal or the paraformaldehyde with the mixture, heating the new mixture, and performing dehydration on the new mixture to obtain the product; or the preparation method comprises the following steps of: uniformly mixing the phenol or the phenol derivatives, the polyamine and the methanal or the paraformaldehyde, heating the mixture, adding the fatty acid or the fatty acid polymer into the mixture, heating the new mixture, and performing the dehydration on the new mixture to obtain the product. The curing agent disclosed by the invention is very strong in salt spray corrosion resistance, is superior to polyamide curing agent and curing agent products of modified phenolic aldehyde amide resin and mixtures of the modified phenolic aldehyde amide resin, and has good impact strength and flexibility as well as excellent water tolerance.

A method for manufacturing a HDPE wood plywood mainly includes: rolling dense pin holes on the cementing surface of a veneer; replacing urea formaldehyde, phenolic aldehyde and other adhesives with HDPE plastic film; laying up in the common conventional plywood lay-up method and only laying the HDPE film instead of the adhesives; heating and pressuring the lay-up on a hot press machine and then pressuring and cooling on a cold press machine. The problems that the HDPE is immiscible with the wood, and can not be taken for the adhesive of the wood are solved by applying the principle of mechanical locking; The heat loss and the time consumption of the hot press machine can be avoided when the lay-up is cooled, for pressing is carried out on the hot press machine and the cold press machine respectively. The plywood product has formaldehyde-pollution-free production, high strength, durability, weather resistance, acid and alkali resistance, high water resistance, good appearance and low price. The manufacturing process has no pollution, and is environment-friendly, energy-saving, efficient and simple.

The invention provides a method for preparing a polyurethane/phenolic aldehyde foam thermal insulation material and belongs to the field of the foam thermal insulation material. The invention aims to solve the problems of poor fire resistant property and strong brittleness in the prior polyurethane foam and phenolic aldehyde foam respectively. The method comprises the following steps that: a prepolymer of alkali phenolic resin, isocyanate and polyether glycol are used as raw materials, and the prepolymer is added with a surfactant and a foaming agent for free foaming at room temperature to prepare the polyurethane/phenolic aldehyde foam thermal insulation material, wherein the weight ratio of the isocyanate to the alkali phenolic resin is 3-1:1, the consumption of the polyether glycol is 20 to 50 percent of the weight of the isocyanate, the consumption of the surface active agent is 4 to 10 percent of the weight of the alkali phenolic resin, and the consumption of the foaming agent is 1 to 10 percent of the weight of the alkali phenolic resin. The method has the advantages of the suitability for places where the foaming-in-place insulation is necessary, stable process reaction, good operability and easily bought raw materials; and the foam thermal insulation material prepared by the method has the advantages of little surface pulverization, good toughness, good fire resistant property, and the like.

The invention discloses a manufacturing method for improving accuracy of a PCB back drilling hole. The manufacturing method comprises the steps as follows: A), a circuit board substrate is subjected to front procedure processing, through-hole drilling, copper deposition, board electroplating, outer circuit pattern transferring, pattern electroplating and the like; B), back drilling is performed on a PCB 4, and whether the depth of the back drilling hole is qualified is detected; and C), a well drilled back drilling hole is subjected to alkaline etching and photosensitive welding resistance, and finally a finished product is manufactured. The technical scheme is characterized in that drill file coefficients used in a through-hole drilling procedure are correspondingly corrected according to expansion and contraction data obtained in a technological process from the through-hole drilling procedure to the drilling procedure of the PCB 4 during back drilling, and the drill file data is maintained to be consistent with actual expansion and contraction; a drilling-in surface in the through-hole drilling procedure is consistent with that during the back drilling; and a phenolic aldehyde base plate 6 is additionally paved on the top surface of the PCB 4. With the adoption of the manufacturing method, the depth accuracy and the position accuracy of a back drilling hole of a conventional PCB 4 can be effectively improved, so that the completeness of signal transmission of the PCB 4 is guaranteed.

The invention discloses a foaming phenolic resin preparation method. The method comprises the following steps: A, phenol, aldehyde and alkali catalyst are added into a reactor, the mole ratio is 1 : 1-3 : 0.01-0.1, and the components are stirred for 5 to 8 hours at 70 to 90 degrees centigrade; B, the temperature of reaction liquid in step A is reduced to 50 to 60 degrees centigrade, acid is added and stirred until the pH value is 6.0 to 8.0; and C, the reaction liquid in step B is decompressed and dehydrated to 60 to 70 degrees centigrade and 2500 to 7000 m Pa.s viscosity. The invention further discloses phenolic resin foam made of the phenolic resin. The invention makes the foaming phenolic resin which can gel quickly have low free monomer content and high curing activity through controlling the synthesis technology condition accurately. The aperture of the prepared phenolic foam body is only 50 to 60 microns. The structure of the micro holes of the foam body is regular and the foam holes are fine and compact. The prepared phenolic foam body does not need any toughening modifier and no residue falls.

The invention relates to a paint material with formed organic film, in particular to an epoxy solvent-free anticorrosive paint applied to low surface treatment steel structure. The anticorrosive paint is prepared by efficiently compounding rusted coating pigments such as zinc molybdate, zinc phosphate, aluminium trippolyhosphate, iron oxide red and the like, using cashew nut oil modified long-chain amine phenolic aldehyde as, alicyclic glycidyl ether as active diluent, thus overcoming the problems that surface treatment technique in coating construction costs high and heavy anticorrosive paint with high solvent content pollutes the environment, having easy preparation and construction, low cost, fast solidification at high temperature, good mechanical and anticorrosive performance, solvent-free and environment-friendly properties, and being applicable to heavy anticorrosive projects of steel structures such as ship, train, bridge and the like.

The invention relates to a preparation method of lignin modified phenolic foam, comprising the following steps: modifying high molecular weight lignin in order to degrade into low molecular weight lignin, wherein the activity is improved, replacing the phenol by the degraded lignin, preparing lignin modified resol, mixing with curing agent, foaming agent and surfactant, foaming at room temperature (25-30 DEG C) or in an oven of temperature 40-80 DEG C, finally the modified phenolic foam plastic is obtained after the curing process. The preparation method of the invention has the following advantages: the cost of the phenolic foam is greatly reduced, the toughness of the foam is increased and the brittles is decreased, thus the foam of the lignin modified phenolic foam has good market prospect; the preparation method of the invention provides a high-addition way to the abundant pulp paper-making waste liquid and forestry and agricultural residues, and reduces the dependency of phenolic foam industry on petrochemical raw material phenol.

The invention relates to a preparation method of polyurethane-prepolymer-toughened modified phenolic foam plastic, which comprises the following steps: vacuumizing and dehydrating polyalcohol, dropwisely adding the polyalcohol into isocyanate to react in a nitrogen atmosphere, and adding a chain extender to react; regulating an alkaline A-stage phenol formaldehyde resin with acid according to parts by mass, adding a toughener polyurethane prepolymer, a surfactant, a foaming agent 1 and a curing agent into the resin to obtain a foamed system; and stirring uniformly the foamed system at room temperature, and heating to cure and form to obtain the polyurethane-prepolymer-modified flame-retardant phenol formaldehyde foam thermal-insulation material. The phenol formaldehyde foam has the advantages of less shedding, high toughness and the like; and the adopted phenol formaldehyde resin has the advantages of low viscosity and favorable compatibility with the polyurethane prepolymer, and can be easily mixed uniformly.

About 0.001 to 1 part by weight of a phenol component (B1) and/or about 0.001 to 10 parts by weight of an amino acid (B2) are added relative to 100 parts by weight of a polyacetal resin (A) to prepare a polyacetal resin composition. The phenol component (B1) may be a novolak phenol-series resin, a phenol aralkyl-series resin, a polyvinyl phenol-series resin, a polyhydric phenol, a polyphenol, a catechin compound, or a lignin. The amino acid (B2) may be an α-amino acid, a β-amino acid, a γ-amino acid, a δ-amino acid, or a derivative of an amino acid. The polyacetal resin composition may further contain an antioxidant, a heat stabilizer, a processing stabilizer, a weather (light)-resistant stabilizer, or a coloring agent. The polyacetal resin composition ensures marked inhibition of formaldehyde emission.

The invention discloses a halogen-free resin composition, a prepreg prepared from the halogen-free resin composition and a laminated board prepared from the halogen-free resin composition and used for a printed circuit. The halogen-free resin composition comprises alkylphenol epoxy resin, benzoxazine resin, an alkylphenol aldehyde curing agent and a phosphorus-contained flame retardant. The molecular structure of alkylphenol epoxy resin adopted in the halogen-free resin composition contains more branched alkyls, so that the halogen-free resin composition is relatively high in glass transition temperature, low in water absorption rate, favorable in heat resistance and excellent in dielectric performance; benzoxazine resin is mixed, so that the dielectric constant, dielectric loss value and water absorption rate of a solid can be further reduced; alkylphenol aldehyde is used as a curing agent, so that the advantages of excellent dielectric performance and low water absorption rate generated by more alkyls in the structure are sufficiently exerted. The prepreg prepared from the halogen-free resin composition and the laminated board prepared from the halogen-free resin composition and used for the printed circuit have the advantages of low dielectric constant, low dielectric loss factor, low water absorption rate, high size stability, high heat resistance, and favorable flame retardance, processability and chemical resistance.

The application belongs to the field of synthetic resin and particularly relates to modified epoxy resin and a modified epoxy resin composition. The modified epoxy resin composition provided by the invention comprises the following components in parts by weight: 50-60 parts of modified epoxy resin, 10-30 parts of polyfunctional epoxy resin, 20-30 parts of a phosphorus-containing curing agent, 1-5 parts of a nitrogen-containing curing agent and 0.1-1 part of a curing accelerator, wherein the polyfunctional epoxy resin is one or more of o-cresol formaldehyde epoxy resin, phenol phenolic aldehyde epoxy resin, bisphenol A formaldehyde phenolic aldehyde epoxy resin, biphenyl type epoxy resin, triphenol hydroxyl methane phenolic aldehyde epoxy resin, tetraphenol hydroxyl methane phenolic aldehyde epoxy resin, tetraphenol ethane epoxy resin and phenoxy resin. Experimental results show that the modified epoxy resin composition provided by the invention has a glass-transition temperature higher than 165 DEG C and good impact toughness and meanwhile, UL-94 V0 level halogen-free flame retardancy is achieved.

Adhesive compositions having a reduced cure time and methods for making and using same are provided. In at least one specific embodiment, the adhesive composition can include a mixture of one or more phenolic-aldehyde resins and one or more cure accelerants. The one or more cure accelerants can be selected from the group consisting of: ammonia, ammonium hydroxide, one or more primary amines, one or more secondary amines, one or more tertiary amines, one or more alkanolamines, one or more aromatic amines, one or more polyamines, one or more amides, one or more polyamides, one or more compounds containing at least one amine functional group and at least one sulfur functional group, and any mixture thereof. In one or more embodiments, the adhesive composition can also include one or more hardeners.

The invention relates to a formaldehyde-free environment-friendly vegetable protein modified adhesive, which aims to solve the problem that the prior urea-formaldehyde adhesive, phenolic aldehyde adhesive and melamine aldehyde adhesive release formaldehyde and cause environmental hazard and pollution, etc. The compositions in portion by weight of the modified adhesive are: 30 to 50 portions of natural plant dregs, 5 to 12 portions of basic material, 5 to 10 portions of calcium hydroxide emulsion, 6 to 15 portions of urea, 4 to 10 portions of alkyl sodium sulfate, 2 to 5 portions of 10 to 20 percent of inorganic acid and 90 to 120 portions of deionized water. The invention takes macromolecular proteins in natural plant soybean dregs, peanut dregs, rapeseed dregs, cottonseed dregs, linseed dregs and sunflower seed dregs as raw materials so as to synthesize a new-generation formaldehyde-free environment-friendly vegetable protein modified adhesive through chemical modification. The formaldehyde-free environment-friendly vegetable protein modified adhesive has the characteristics of uniform and stable product, high adhesion strength, hydrolysis resistance and nontoxicity, etc.; moreover, the performance and the price of the modified adhesive are suitable for wood adhesion and for making artificial fiber boards such as plywood, shaving board and fiber board.

The invention provides phenolic aldehyde epoxy modified organic silicon resin, and a long-acting anticorrosion temperature-resistant coating prepared by the phenolic aldehyde epoxy modified organic silicon resin. The phenolic aldehyde epoxy modified organic silicon resin is synthesized by novolac epoxy formamide and organic silicon resin acetophenone under the existence of solvents and catalysts in a grafting mode. The phenolic aldehyde epoxy modified organic silicon resin, color filler, auxiliaries and diluents are uniformly stirred, then grinding is carried out through a sand miller or a three-roller machine to 40-80 micrometers, filtering is carried out through the filter screen, measurement packing is carried out, and an A component is obtained through preparation. Composite type amine curing agents are prepared to be a B component. The A component and the B component are uniformly mixed to obtain the long-acting anticorrosion temperature-resistant coating according to the weight ratio of 5-16:1.

The invention provides a resin grinding wheel and a manufacturing method thereof, which belong to the field of grinding tools and are used for solving the problem of the production of harmful sulfur dioxide by pyrite serving as a lubricating agent existing in the conventional resin grinding wheel. The resin grinding wheel comprises a grinding body and a reinforcing sheet which is arranged inside the grinding body for enhancing the revolving strength of the grinding body, wherein 90-105 parts by mass of corundum is taken as a grinding material the grinding body; 2-8 parts by mass of phenolic aldehyde resin liquid and 6-25 parts by mass of phenolic aldehyde resin powder are taken as bonding agents; and 1-10 parts by mass of cryolite and 1-5 parts by mass of polytetrafluoroethylene powder are taken as fillers. The invention further provides a manufacturing method of the resin grinding wheel. In the grinding wheel, the polytetrafluoroethylene powder instead of pyrite is taken as a lubricating agent, so that sulfur dioxide is not produced and other pollution is avoided in the using process.