111 results about "O-Cresol" patented technology

The invention discloses a wear-resistant high-strength composite polyurethane sieve plate and a preparation method thereof, and belongs to the technical field of polyurethane sieve plate processing.The preparation method comprises the following steps that modified polyurethane is added into xylene, the temperature of a reaction system is increased to 90-100 DEG C, stirring is conducted till the system is dissolved and clarified, and a polyurethane sieve plate is obtained; the preparation method comprises the following steps: adding olefin double bond modified aluminum oxide powder and a catalyst into a reaction system, taking composite polyurethane prepared from modified aluminum powder reinforced modified polyurethane as a polyurethane sieve plate base material, and carrying out reinforced crosslinking on the composite polyurethane by using o-cresol formaldehyde epoxy resin and modified nylon fiber; the strong acid and alkali corrosion resistance of the composite polyurethane sieve plate is effectively improved, and the service life of the composite polyurethane sieve plate is effectively prolonged.

The embodiment of the invention provides a method for separating various phenols from cresol containing 2, 6-xylenol, which utilizes the characteristics that 2, 6-xylenol, 2, 4-xylenol, 2, 5-xylenol and isobutene can only generate mono-tert-butylated phenol, m-cresol, p-cresol and o-ethyl phenol, and o-cresol and isobutene can generate di-tert-butylphenol, and contains 2, 6-xylenol, 2, 4-xylenol, 2, 5-xylenol and 2, 4-xylenol. According to the method, cresol containing 2, 6-xylenol is subjected to the steps of monoalkylation, rectification, dialkylation, rectification, dealkylation, rectification and the like to realize separation of various phenols, so that the problem that the quality of m-cresol and p-cresol is influenced by 2, 6-xylenol when cresol extracted from medium-low temperature phenol-containing coal tar is separated is solved.

The invention discloses a crude phenol continuous refining device and method, the device comprises a crude phenol storage tank, a dehydrating tower, a primary tower, a phenol fraction tower, an o-cresol fraction tower, a m-cresol and p-cresol tower, an extractive distillation tower and a p-cresol fraction tower which are connected in sequence, and the top of each tower is independently connected with a cooler; the method specifically comprises the following steps: (1) discharging phenol water; (2) discharging a heavy fraction; (3) discharging phenol; (4) discharging o-cresol; (5) discharging residual oil at the bottom of the tower; (6) carrying out extractive distillation, and discharging m-cresol; and (7) discharging p-cresol, and recycling the extraction agent. Compared with a traditional continuous rectification process, the method has the advantages that all components are separated by adopting vacuum rectification, the separation degree of the obtained product is higher, the number of theoretical plates and energy consumption are lower, high-purity phenol products are produced with low energy consumption, low cost and high efficiency, and economic benefits and environmental benefits are greatly improved.

The invention discloses a yellowing-resistant and high-temperature-resistant UV curing coating and a preparation method thereof. The yellowing-resistant and high-temperature-resistant UV curing coating is prepared from the following components in percentage by weight: 40.0 to 70.0 percent of o-cresol formaldehyde acrylic resin (EOCA), 10.0 to 30 percent of reactive diluent, 1 to 6 percent of photoinitiator, 0.1 to 0.5 percent of flatting agent, 0.1 to 0.5 percent of defoaming agent, 0.2 to 1 percent of dispersing agent, 0.5 to 2 percent of yellowing-resistant agent and 10 to 30 percent of filler. The o-cresol formaldehyde acrylic resin is prepared from the following components in percentage by weight: 20 to 60 percent of o-cresol formaldehyde epoxy resin, 20 to 40 percent of 3, 4-dimethoxycinnamic acid, 10 to 30 percent of diluent, 0.1 to 0.6 percent of catalyst, 0.5 to 2 percent of polymerization inhibitor and 10 to 30 percent of tetrahydrophthalic anhydride. The yellowing-resistant and high-temperature-resistant UV curing coating provided by the invention is high in coating film curing speed and excellent in thermal stability and yellowing resistance.

The invention relates to the technical field of epoxy molding compounds, in particular to a low-stress low-hygroscopicity epoxy resin composition and application thereof. The low-stress low-hygroscopicity epoxy resin composition is prepared from the following components: epoxy resin, phenolic resin, inorganic filler, a coloring agent, a release agent, a curing accelerator, an ion trapping agent and a coupling agent, the epoxy resin is composed of o-cresol formaldehyde type epoxy resin and branched diphenyl sulfide epoxy resin, and the branched diphenyl sulfide epoxy resin is obtained by crosslinking 4, 4 '-dihydroxy diphenyl sulfide, inositol and epichlorohydrin; by adding the branched diphenyl sulfide epoxy resin into the epoxy resin composition, the mechanical property and the water absorption rate of the epoxy resin composition are remarkably improved, so that the stability and the reliability of a product are improved, and the epoxy resin composition can be used for packaging small and thin integrated circuits.

The invention discloses a preparation method of an (R) 2-(4-chloro-2-methylphenoxy) isooctyl propionate root inhibitor. The method comprises the following steps: carrying out condensation reaction on L-2-chloropropionic acid and o-cresol under the promotion of alkali to obtain (R) 2-methylphenoxypropionic acid; carrying out esterification reaction on the (R) 2-methyl phenoxy propionic acid and isooctyl alcohol (2-ethyl hexanol) under the action of a catalyst to obtain (R) 2-methyl phenoxy isooctyl propionate; the (R) 2-methyl phenoxy isooctyl propionate is chlorinated by a chlorination reagent to obtain (R) 2-(4-chloro-2-methyl phenoxy) isooctyl propionate; the (R) 2-(4-chloro-2-methylphenoxy) isooctyl propionate obtained by the method disclosed by the invention is high in yield, good in optical activity and excellent in quality; the method has the advantages of novel synthesis route, easily available raw materials, low cost, simple and feasible process operation, short time consumption, less waste, small pollution and suitability for industrial production, and can fill the domestic blank and relieve the current situation of dependence on import.

The invention provides a preparation method of an easy-to-grind epoxy functional film and a wafer-level chip packaging structure, and relates to the technical field of chip packaging, the easy-to-grind epoxy functional film comprises the following components by mass: 10-15 parts of phenoxy resin, 10-15 parts of o-cresol novolac epoxy resin, 1-4 parts of carboxyl-terminated nitrile rubber, 15-20 parts of a latent curing agent, and 1-3 parts of an accelerator. 50-52 parts of angular silica powder and 2 parts of carbon black; wherein the molecular weight of the phenoxy resin is 30000 to 35000; the phenoxy resin and the o-cresol novolac epoxy resin are used as matrix resin, the angular silica powder is used as the filler, and the carboxyl-terminated nitrile rubber, the latent curing agent and the accelerant are combined, so that the grinding efficiency of the epoxy functional film is improved, the epoxy functional film meets the working requirements of an automatic film sticking machine and a grinding machine, and the production efficiency is improved.

The invention discloses a method for preparing anisole by taking dimethyl carbonate as a methylation reagent, a ternary concerted catalytic system is created for the first time to break through temperature limitation, phenol is efficiently activated by [BMIM] OH to generate high-activity phenoxy anions through a composite catalytic design of an alkaline ionic liquid / quaternary ammonium salt / nano metal oxide, the quaternary ammonium salt executes phase transfer and reaction path switching, and the anisole is prepared by taking dimethyl carbonate as a methylation reagent. The nano metal oxide has the effects of balance regulation and structural protection, and the conversion rate of phenol is gt according to the mass ratio of phenol to dimethyl carbonate to basic ionic liquid to quaternary ammonium salt compound to nano metal oxide being 94: (99-117): (2.82-7.52): (0.94-4.7): (0.47-3.76); the selectivity of anisole is gt; the method has the advantages that the concentration is 99%, decomposition of DMC and generation of by-products such as o-cresol are inhibited from the source, a self-settling separation-circulation method subverts a catalyst recovery mode, the by-products are directionally inhibited, the separation process is simplified, and the product can reach gt through single washing and reduced pressure distillation; and high-energy-consumption multi-tower rectification for substances with approximate boiling points in the traditional method is omitted, so that the economic benefit is greatly improved.

The invention discloses a method for producing methylphenol through transalkylation, which comprises the following steps: enabling a raw material to pass through a reactor bed filled with a transalkylation catalyst, and reacting at 300-480 DEG C to obtain the methylphenol, the raw material being a mixture of phenol and C8 + heavy alkylphenol. Or a mixture of phenol and C8 + heavy alkylphenol is used as a raw material, and a phenol / C8 + heavy phenol transalkylation reaction is carried out in the presence of a transalkylation catalyst in the presence of hydrogen to obtain the methylphenol. According to the method, phenol is used as a methyl acceptor, a product generated through transalkylation reaction is mainly methyl phenol with o-cresol as a main component, the added value of the product is increased, and the integrating degree with the crude phenol refining industry is higher. The mass ratio of phenol to C8 + heavy phenol in the feed can reach 50: 50, and the heavy phenol treatment capacity, the conversion rate and the total selectivity of methylphenol are high.

The invention relates to the technical field of catalytic material synthesis, and discloses a preparation method of a modified tin-titanium-silicon molecular sieve catalyst, which comprises the following steps: S1, mixing a silicon source, a titanium source, a tin source, an alkali source, a template agent, a surfactant and water to obtain a first mixture; s2, performing hydrothermal reaction on the first mixture in the step S1, and washing, drying and roasting an obtained second mixture to obtain tin-titanium-silicon molecular sieve powder; and S3, mixing and contacting the tin-titanium-silicon molecular sieve powder obtained in the step S2 with an organic solution of organosiloxane, and then drying to obtain the modified tin-titanium-silicon molecular sieve catalyst. According to the modified tin-titanium-silicon molecular sieve catalyst provided by the invention, a catalytic activity center is mainly positioned in a molecular sieve pore channel, and when the catalyst is used for catalyzing a reaction for preparing cresol through toluene hydroxylation, effective shape-selective catalysis can be realized, so that the selectivity of o-cresol and p-cresol can be improved, and particularly the selectivity of the o-cresol can be improved.

The invention relates to the field of organic chemical synthesis, and discloses a method for preparing homo-2-methyl-4-chloropropionic acid. Comprising the following steps: reacting chiral 2-chloropropionic acid with a liquid caustic soda solution to generate sodium 2-chloropropionate, reacting p-chloro-o-cresol with liquid caustic soda to generate sodium p-chloro-o-cresol, carrying out nucleophilic substitution reaction to generate a precursor of 2-methyl-4-chloropropionic acid, carrying out acidification reaction to generate 2-methyl-4-chloropropionic acid, cooling, crystallizing, purifying, extracting with a solvent and the like. By controlling reaction conditions, such as temperature, pH value, reaction time and the like, a high-yield and high-purity product is ensured, and the optical loss is less than 1.5%. The method is efficient, environmentally friendly and suitable for large-scale industrial production, and high quality and stability of 2-methyl-4-chloropropionic acid can be guaranteed.

The invention belongs to the field of catalysts, and particularly relates to a catalyst, a preparation method thereof and a method for preparing o-cresol and 2, 6-xylenol by using the catalyst. The molar ratio of the iron element to the vanadium element to the zirconium element to the indium element in the catalyst is 100: (2-15): (1-6): (0.2-4), the preparation process is simple, and the raw material cost is low. The catalyst provided by the invention has the characteristics of high conversion rate, high ortho-cresol selectivity and high stability in the reaction of preparing ortho-cresol and 2, 6-xylenol through phenol methylation, the phenol conversion rate can reach 90% or above, the ortho-cresol selectivity can reach 50% or above, and the one-way life of the catalyst exceeds 5700 hours.

The present invention discloses a continuous refining device and method for crude phenol, the device comprises a crude phenol storage tank, a dehydration tower, a primary distillation tower, a phenol fraction tower, an o-cresol fraction tower, a m-cresol tower, an extractive distillation tower and a p-cresol fraction tower connected in sequence, and the top of each tower is individually connected to a cooler; the method specifically comprises the following steps: (1) discharging phenol water; (2) discharging heavy fractions; (3) discharging phenol; (4) discharging o-cresol; (5) discharging residual oil at the bottom of the tower; (6) extractive distillation, discharging m-cresol; (7) discharging p-cresol, and recycling the extractant. Compared with the traditional continuous distillation process, the present invention uses vacuum distillation to separate the components, and the obtained product separation degree is higher, and the theoretical plate number and energy consumption are less, so that high-purity phenol products can be produced with low energy consumption, low cost and high efficiency, which greatly improves the economic and environmental benefits.

The invention discloses a high-temperature-resistant epoxy molding compound for electronic packaging and a preparation method thereof, and relates to the field of electronic packaging materials. The invention aims to solve the problem that the epoxy molding compound prepared in the prior art is poor in high temperature resistance and cannot meet the higher working temperature requirement of a new generation of semiconductors. The invention discloses a high-temperature-resistant epoxy molding compound for electronic packaging. The high-temperature-resistant epoxy molding compound is prepared from the following components in percentage by mass: 10%-15% of o-cresol formaldehyde epoxy resin, 12%-18% of dicyclopentadiene cyanate ester, 0.1%-0.5% of copper acetylacetonate, 70%-80% of inorganic filler, 1%-2% of a coupling agent, 0.5%-1% of a release agent and 0.1%-0.5% of carbon black. A triazine ring structure with a high cross-linking characteristic is introduced into a resin matrix, so that the heat resistance is excellent; the prepared high-temperature-resistant epoxy molding compound for electronic packaging has the characteristics of high heat resistance, low dielectric constant, high breakdown field strength, high mechanical strength and the like, and is applied to the field of electronic packaging.

The invention relates to the technical field of organic synthesis, and discloses a continuous preparation process of p-chloro-o-cresol, which comprises the following steps: mixing o-cresol and dichloroethylene, reacting with sulfuryl chloride in the presence of a proper catalyst, and controlling the reaction process by adopting staged sulfuryl chloride addition rate to avoid the occurrence of polychlorination side reaction. The reaction temperature is kept between 5 DEG C and 15 DEG C, products are effectively separated and recycled through a rectification and tail gas treatment system, and generation of by-products is reduced. The process has the advantages of mild reaction conditions, lower catalyst dosage, higher product purity and better environmental protection effect, is suitable for large-scale industrial production, and has higher resource utilization efficiency.

The application belongs to the field of functional material preparation and catalysis technology, and discloses a preparation method of an iron oxide catalyst, which comprises the following steps: dissolving an iron precursor and a promoter in water respectively to form uniform aqueous solutions; mixing the two aqueous solution systems and stirring to make them uniformly mixed; continuously heating and stirring the mixed aqueous solution to evaporate water; drying the gel-like substance, and then calcining at a specified temperature for 5h to obtain the iron oxide catalyst. The method of the application obtains the iron oxide catalyst with high catalytic performance by calcining the mixture of the promoter and the iron precursor, and uses the iron oxide catalyst to catalyze the methylation reaction of phenol and methanol. The application improves the conversion rate and selectivity of the reaction by improving mass transfer, increasing the specific surface area and the content of acid sites, and has the advantages of simple operation, good repeatability, low cost, phenol conversion rate of 94.4%, product 2,6-dimethylphenol selectivity of 50.1%, and o-cresol selectivity of 49.2%.

The invention discloses a medical rubber sealing element with a self-lubricating function and a preparation method of the medical rubber sealing element, and relates to the field of manufacturing of medical rubber sealing elements. The medical rubber sealing element with the self-lubricating function prepared by the invention comprises a rubber compound, a vulcanizing agent and a self-lubricating agent, the rubber compound comprises cross-linked butyl rubber, chlorinated butyl rubber and chlorinated polyethylene rubber; the self-lubricating agent is modified fluorine-containing silicone oil, the cross-linked butyl rubber is prepared from acrylic hyperbranched siloxane and butyl rubber through a reaction, and acrylic hyperbranched siloxane is prepared from o-cresol epoxy acrylic acid, carboxyl-terminated poly (diethylene glycol adipate) and amino-terminated hyperbranched siloxane through a reaction; the modified fluorine-containing silicone oil is prepared by reacting fluorine-containing silane with dimethyl silicone oil and then crosslinking with triallyl isocyanurate, and the fluorine-containing silane is prepared by copolymerizing tetrafluoroethylene and perfluorovinyl ether and then reacting with a silane coupling agent, so that the lubricating property, high temperature resistance and lubricity of the medical rubber sealing element are improved.

This invention discloses an ultrathin flame-retardant halogen-free epoxy fiberglass sheet and its preparation method, belonging to the technical field of epoxy fiberglass materials. The preparation process includes preparing a resin solution by mixing phosphorus-containing epoxy resin, bisphenol A phenolic epoxy resin, o-cresol phenolic epoxy resin, benzoxazine resin, phosphorus-containing phenolic flame-retardant curing agent, toughening agent, catalyst, coupling agent, and a mixed solvent. Composite fillers and flame-retardant synergists are added, and the mixture is dispersed at high speed and then impregnated with fiberglass cloth. After drying, a semi-cured sheet is obtained, which is then stacked and hot-pressed to obtain the finished product. Compared with existing technologies, the ultrathin fiberglass sheet obtained by this invention meets the UL94 V-0 halogen-free flame-retardant standard, has a high glass transition temperature, and maintains excellent electrical insulation performance and dimensional stability even at ultrathin thicknesses. During processing, the resin flow is uniform and there is no bubble delamination. This sheet is environmentally friendly and halogen-free, with excellent comprehensive performance, and is suitable for automotive insulation, electronic packaging, and printed circuit boards.

The invention discloses a preparation method and a preparation system of p-chloro-o-cresol, and the preparation method comprises the following steps: 1) adding dichloroethane into molten o-cresol, and adding a catalyst; (2) controlling the temperature to be 5-15 DEG C, and adding sulfuryl chloride into the material in the step (1) at different feeding speeds according to the reaction time and the reaction stage; and (3) after the reaction is finished, rectifying and purifying liquid of reaction materials to obtain the p-chloro-o-cresol. According to the present invention, the process is simple, the reaction condition is mild, the reaction is controlled, the selectivity is high, the ortho-cresol is subjected to preferential para-position chlorination, the reaction is sufficient, the selectivity is high, the polychlorination phenomenon is avoided, the phenol content and the isomer content in the crude product are low, the yield is high, and the large-scale production is easily achieved.

The application relates to a preparation method and application of a Ni / C catalyst, in particular to application of the Ni / C catalyst in hydrogenation of o-cresol into o-methylcyclohexanol, and belongs to the technical field of preparation of catalytic hydrogenation catalysts. The Ni / C catalyst used in the reaction system is obtained through one-step pyrolysis by taking Ni-BTC as a self-sacrificial template. The preparation raw material of the Ni / C catalyst is extensive, the price is low, the whole catalyst preparation process is simple, convenient and controllable, and the Ni / C catalyst is suitable for large-scale preparation. The Ni / C catalyst with high catalytic activity and selectivity is in-situ formed through pyrolysis at a lower temperature, the catalyst stability is very good, no obvious deactivation phenomenon is generated after 7 cycles of reaction, and the catalyst is easy to be separated through magnetic adsorption after the catalytic reaction is completed due to the magnetism of the catalyst, and the catalyst is convenient to recycle.

The invention discloses a preparation process of industrial-grade o-methylhydroquinone, and relates to the technical field of production of o-methylhydroquinone, o-cresol, a supported palladium-copper bimetallic catalyst, potassium carbonate and a solvent are added into a reaction kettle, oxygen is introduced for a reaction, a reaction liquid is cooled, hydrogenation reduction is performed, crystallization is performed, and an o-methylhydroquinone product is obtained. The method is high in yield and environment-friendly, and the production cost is reduced.

This invention provides a method for preparing a supported catalyst for synthesizing high-purity carvacrol and its application, belonging to the field of carvacrol synthesis reaction technology. The o-cresol alkylation catalyst prepared by this method mainly uses modified zinc aluminate as the catalytic component, which has active centers suitable for o-cresol alkylation. The addition of alumina support can distribute the active centers and prevent the aggregation of active sites, thereby preventing the formation of heavy components and coke, maintaining a high conversion rate of o-cresol and selectivity of carvacrol, and maintaining the stability of catalyst activity. It has the advantages of simple preparation method and good stability. The average conversion rate of o-cresol is above 55%, and the selectivity of carvacrol is above 93%. It has high selectivity, few by-products, low reaction temperature, significantly reduced energy consumption, and less waste, making it suitable for industrial application. Moreover, the purity of the obtained carvacrol is above 99.5%.

The invention discloses a method for producing phenylalkyl ether from phenol / o-cresol fractions, which comprises the following steps: rectifying phenol-containing raw materials to obtain a mixture containing phenol and o-cresol, the phenol-containing raw materials comprising crude phenol containing phenol and o-cresol, mixed phenol, o-cresol fractions, m-p fractions and phenol-containing coal tar; alkylating a mixture containing phenol and o-cresol, and washing to obtain a material layer; and rectifying the material layer to obtain a product comprising the phenylalkyl ether and the o-methyl phenylalkyl ether. The mixture containing phenol and o-cresol is used as a raw material, phenol and o-cresol are converted into phenylalkyl ether and o-methyl phenylalkyl ether through reaction with an alkylating agent and the like, the boiling point difference of the two materials after etherification is increased, the boiling point is reduced, and the melting point is reduced; therefore, the difficulty of rectifying and separating the mixture of the phenylalkyl ether and the o-methyl phenylalkyl ether is obviously reduced, the rectifying yield and the rectifying cost are greatly reduced, and the method is more economical.

The present application relates to the technical field of epoxy encapsulation material, and particularly relates to a low-stress and low-hygroscopicity epoxy resin composition and application thereof. The low-stress and low-hygroscopicity epoxy resin composition is prepared from the following components: epoxy resin, phenolic resin, inorganic filler, colorant, release agent, curing accelerator, ion capture agent and coupling agent; the epoxy resin is composed of o-cresol formaldehyde type epoxy resin and branched diphenyl sulfide epoxy resin, wherein the branched diphenyl sulfide epoxy resin is obtained by crosslinking 4,4'-dihydroxydiphenyl sulfide, inositol and epichlorohydrin; by adding the branched diphenyl sulfide epoxy resin in the epoxy resin composition, the mechanical properties and water absorption of the epoxy resin composition are significantly improved, thereby improving the stability and reliability of the product, and the epoxy resin composition can be used for packaging of small and thin integrated circuits.

This invention relates to a composition for preparing epoxy resin films, epoxy resin films and their preparation methods, carbon fiber composite materials and their preparation methods and applications, belonging to the field of resin technology. The epoxy resin film composition provided by this invention comprises the following components in parts by weight: 50-65 parts of polysiloxane-modified o-cresol epoxy resin; 35-50 parts of polysiloxane-modified bisphenol A type epoxy resin; and 8-12 parts of curing agent. This invention uses polysiloxane-modified o-cresol epoxy resin and polysiloxane-modified bisphenol A type epoxy resin as raw materials for preparing epoxy resin films, which can produce films with appropriate wet and dry conditions and certain strength and toughness. When used in the preparation of carbon fiber materials, it can improve the flame retardant and smoke suppression properties of carbon fiber materials.

The present invention discloses a method for producing methylphenol by gas-phase alkylation of phenol and methanol in a fixed-bed adiabatic reactor. Phenol and methanol are separately vaporized, mixed in a certain mass ratio, and then introduced into a fixed-bed adiabatic reactor containing a catalyst. The phenol and methanol undergo a gas-phase alkylation reaction to produce o-cresol, m-cresol, p-cresol, and some xylenols. By controlling the mass ratio of phenol and methanol, the purpose of controlling the adiabatic temperature rise is achieved. The products generated by the reaction are subjected to rectification and separation to obtain a mixture of o-cresol, m-cresol, and p-cresol, as well as products such as xylenol. Compared with the existing technology, the method for producing methylphenol by gas-phase alkylation of phenol and methanol in a fixed-bed adiabatic reactor provided by the present invention has the advantages of a simple reaction process, high catalyst loading efficiency, and no addition of inert circulating materials. It also achieves the advantages of reducing equipment investment, energy consumption, and wastewater.

A method for quantifying the magnesium ion amount in a soil sample, the method including: extracting calcium ions from a soil sample to produce a soil sample substantially free of calcium: mixing the substantially free calcium soil sample with ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid tetrasodium salt (EGTA) to produce a first sample; mixing the first sample with an indicator reagent to produce a second sample; and determining the magnesium ion amount of the second sample; wherein the indicator reagent comprises o-cresolphthalein complexone (OCPC) and tetrabutyl ammonium hydroxide (TBAH). Also, a system and a kit using the method.

The invention provides a positive photosensitive resin composition, a resist film, a resist underlayer film, and a resist permanent film. The invention provides a positive photosensitive resin composition which is capable of obtaining a resist film with excellent developability, chemical resistance and heat resistance, and has good storage stability and thick film forming property. A positive photosensitive resin composition containing the following components (A) to (D): (A) a novolac phenolic resin having an acetal group-based protecting group, containing a phenol structural unit (a1) derived from m-cresol and / or o-cresol and an aldehyde structural unit (a2) derived from salicylaldehyde / (B) a polyhydroxystyrene having an acid-dissociable protecting group / (C) a photoacid generator / (D) a solvent.

This invention relates to a catalyst for preparing ortho-methylated products of phenol. The catalyst is a composite oxide containing indium oxide, with the composition In₂O₃ / X, where X is a promoter. The promoter is selected from one or more of ZrO₂, HfO₂, ZnO, Cr₂O₃, CeO₂, and MgO, and the amount of the promoter metal is 0.01 to 100 times the molar amount of indium. This invention also discloses the application of this catalyst in the reaction of carbon dioxide hydrogenation coupled with phenol methylation to prepare o-cresol and 2,6-dimethylphenol. Compared with traditional catalytic methods, the catalyst of this invention has low energy consumption, long service life, and can highly selectively convert phenol to o-cresol and 2,6-dimethylphenol with almost no byproduct formation.

The invention relates to the technical field of powder coatings, and particularly discloses a wear-resistant powder coating as well as a preparation method and application thereof. The wear-resistant powder coating provided by the invention is prepared from the following components in parts by weight: 60 to 80 parts of epoxy resin, 8 to 12 parts of curing agent, 0.3 to 0.5 part of cellulose acetate butyrate and 0.2 to 2.0 parts of polytetrafluoroethylene modified polyethylene wax, the epoxy resin is bisphenol A epoxy resin and o-cresol formaldehyde epoxy resin in a weight ratio of 1: (0.5-1.5); further, the weight ratio of the bisphenol A epoxy resin to the o-cresol formaldehyde epoxy resin is 1: (0.8-1.3); the invention also provides a preparation method of the wear-resistant powder coating and a spraying method of the wear-resistant powder coating. The wear-resistant powder coating provided by the invention not only has very good skid resistance and wear resistance, but also can present a leather-imitated super-large texture effect, and has a very good use prospect.