12 results about "P-Hydroquinone" patented technology

This invention relates to the field of polymer material processing technology, specifically to an impact-resistant, high-transparency acrylic sheet and its extrusion and calendering equipment and process, comprising the following components in parts by weight: 80-85 parts methyl methacrylate; 0.07-0.09 parts azobisisobutyronitrile; 0.001 parts hydroquinone; and 15-20 parts toughening masterbatch. The particle size of the toughening masterbatch is 2.0 mm to 2.5 mm, and the particle size difference between the polymethyl methacrylate particles and the toughening masterbatch is 0.2 mm to 0.5 mm. By combining a specific composite toughening masterbatch formula with precisely controlled particle size distribution, it can effectively resist the impact of door closing and object bumps, ensuring the structural integrity and durability of the components. The haze is ≤0.45%, which meets the stringent requirements for the "high-end" and transparent appearance of decorative parts such as A-pillars and trim strips, avoiding visual blurring caused by toughening.

The application belongs to the technical field of lubricants, and provides a polyurethane lubricant, a preparation method and application thereof.The polyurethane lubricant provided by the application comprises the following components in percentage by weight: 8-20% of a polyurethane thickening agent, 80-90% of base oil, 1.5-3.5% of an antioxidant, 0.5-2.0% of extreme pressure anti-wear agent, and 0.1-1.5% of lubricant; the polyurethane thickening agent is formed by polycondensation reaction of 4,4'-dicyclohexyl methane diisocyanate (HMDI), polybutylene adipate (PBA) and hydroquinone di(2-hydroxyethyl) ether (HQEE). The polyurethane lubricant provided by the application has excellent high-temperature stability, wide temperature range performance, and extremely high load-carrying and wear resistance.

The application provides a non-inducible engineering strain for producing alpha-matrix and a construction method and application thereof. The engineering strain of the application is a recombinant Escherichia coli, which contains an expression regulatory element and a sucrose phosphorylase gene, and the expression regulatory element includes a PgapA-infC tandem promoter, a Plpp-infC tandem promoter or a PalsR-infC tandem promoter. The engineering strain can greatly shorten the protein expression period without adding an inducer, and the bacterial body after fermentation culture is ended is used as a whole cell catalyst to synthesize alpha-matrix by glycosylation reaction of a substrate hydroquinone and a sugar donor (such as sucrose), and the molar conversion rate of the substrate hydroquinone is high, and the engineering strain has an industrial application prospect.

The application relates to the technical field of genetic engineering, in particular to a sucrose phosphorylase mutant and application thereof in synthesis of alpha-maronia. Streptococcus parasanguinis The application is characterized in that the histidine at the 152th position of the wild-type sucrose phosphorylase from Streptococcus sanguis is mutated into threonine, and the isoleucine at the 336th position is mutated into proline, so that the sucrose phosphorylase mutant is obtained, the catalytic activity and stability of the sucrose phosphorylase are significantly improved. When sucrose and hydroquinone are used as substrates, the yield of alpha-maronia is increased by more than 40% compared with the wild type, and the catalytic reaction time can be greatly shortened.

The utility model relates to chemical technical field, an embodiment of the utility model provides a kind of crystallization device for hydroquinone production, including flash crystallizer, the top of the flash crystallizer is provided with demister, the side of the flash crystallizer is provided with hydroquinone production component, the hydroquinone production component includes condenser, the condenser is arranged in the side of demister, the lower portion of the condenser is provided with condensate tank, the side of the condensate tank is provided with thickener, the lower portion of the thickener is provided with mother liquor tank, the upper portion of the mother liquor tank is provided with centrifuge, the side of the flash crystallizer is provided with crystallization discharge pump, the side of the crystallization discharge pump is provided with clear liquid pump, the side of the clear liquid pump is provided with condensate pump. By the above technical scheme, the technical problem that a kind of crystallization device for hydroquinone production in related art / prior art cannot make crystallizer can produce larger size crystal is solved.

This invention relates to the field of polyetheretherketone (PEEK) preparation, and discloses a continuous feeding method and apparatus for PEEK, comprising: S1. Preheating and mixing an alkali metal salt and a first solvent in a first premixing reactor, wherein the reactor temperature is set to 110-165°C, to obtain a first preheated liquid mixture composition; S2. Preheating and mixing hydroquinone, fluoroketone, and a second solvent in a second premixing reactor, wherein the reactor temperature is set to 110-165°C, to obtain a second preheated liquid mixture composition; S3. Continuously feeding the first and second preheated liquid mixture compositions into a polymerization reactor, respectively, and subjecting the first and second preheated mixture compositions to a high-efficiency polymerization reaction under stepped heating conditions; the applicant found that this feeding method not only significantly improves the synthesis efficiency, but also ensures the performance and batch stability of the PEEK product through a single polymerization reactor.

This invention discloses a biodegradable pressure-sensitive adhesive label and its preparation method, comprising a face material layer, a pressure-sensitive adhesive layer, and a substrate layer arranged sequentially from top to bottom. The face material layer includes a polylactic acid film and an ink layer disposed on the upper end of the polylactic acid film. The raw materials of the pressure-sensitive adhesive layer include 15-30 parts of butyl acrylate, 68-80 parts of acrylic acid, 0.4-0.8 parts of sodium dodecyl sulfate, 0.1-0.5 parts of sodium oleate, 0.2-0.5 parts of dodecyl mercaptan, 0.1-0.4 parts of ammonium persulfate, and 0.2-0.6 parts of hydroquinone. The preparation method includes: Step A: First, design and plate making, and prepare inks and colors for gravure printing and flexographic printing, and prepare the corresponding materials; Step B: Form a release film on the substrate through flexographic printing, and then apply pressure-sensitive adhesive to the release film to form a pressure-sensitive adhesive layer; Step C: Then, print an ink layer on a polylactic acid film through gravure printing to form a face material layer; Step D: Lay the face material layer on top of the pressure-sensitive adhesive layer to form a biodegradable pressure-sensitive adhesive label. This solves the problems of pressure-sensitive adhesive labels being difficult to degrade and having poor adhesion.

This invention relates to the fields of polymer materials and textile engineering, and discloses a high-toughness polyester fabric and its preparation method. The fabric is composed of polyester fibers, a borate-aluminum phytate-silica doped modifier, hydroquinone, and various auxiliaries. The borate-aluminum phytate-silica doped modifier is composed of a dynamic network of borate esters formed by boric acid and polyvinyl alcohol, a coordination structure formed by phytic acid and aluminum ions, and silica doping. By constructing a synergistic reinforcement system with dynamic reconstruction capabilities and multi-point interfacial interactions, and combining this with the regulation of intermolecular forces by hydroquinone, the modified structure is uniformly distributed at the interface and within the polyester fibers, thereby significantly improving the fabric's elongation at break, impact resistance, fatigue resistance, and abrasion resistance. The method of this invention is simple, highly applicable, and yields a polyester fabric with excellent comprehensive performance and promising application prospects.

This invention belongs to the field of organic synthesis technology, specifically relating to a method for the efficient continuous-flow synthesis of high-purity TMPTMA without the need for a water-carrying agent. The method employs a continuous-flow closed-loop reaction system, using trimethylolpropane (TMP) and methacrylic acid (MA) as raw materials, and SO42-. 2‑ Using a ZrO2-TiO2-Al2O3 composite solid acid as a dedicated catalyst and phenothiazine-hydroquinone-p-methoxyphenol as a composite polymerization inhibitor, this invention achieves efficient and continuous synthesis of TMPTMA through an integrated process encompassing raw material pretreatment, continuous flow reaction system construction and commissioning, continuous feeding and continuous flow reaction, in-situ pervaporation dehydration, catalyst separation and crude product purification, and product testing and collection. This invention generates no acidic wastewater, is a green, efficient, and stable process, and features a simple equipment structure, making it easy to scale up for industrial application.

The application discloses a kind of mechanically interlocked catenoid structure hydrogel and preparation method thereof, belong to hydrogel sensing technical field.The preparation steps of the mechanically interlocked catenoid structure hydrogel are as follows: first, prepare carbon nano network solution using hydroquinone;Then the carbon nano network solution, acrylamide, water, crosslinking agent and photo initiator are mixed, and are treated under ultraviolet light irradiation, to obtain the hydrogel.A kind of mechanically interlocked catenoid structure hydrogel is constructed by introducing three-dimensional carbon nano network, blending with acrylamide monomer and in-situ radical polymerization.Carbon nano network provides continuous porous skeleton, polyacrylamide segment is embedded in carbon nano network pore during polymerization, and forms stable catenoid structure by physical winding, space nesting and mechanical interlocking.The prepared hydrogel has excellent mechanical properties, adhesion and strain response capacity, and provides reliable and economical material basis for flexible strain sensing function.

The purpose of the present invention is to provide a method for producing hydroquinone that involves an enzyme that can convert p-hydroxybenzoic acid into hydroquinone at higher efficiencies than the 4-hydroxybenzoate 1-hydroxylase possessed by Candida parapsilosis strain CBS604. This purpose is achieved, for example, by a method for producing hydroquinone, the method comprising a step for obtaining hydroquinone by reacting p-hydroxybenzoic acid with a 4-hydroxybenzoate 1-hydroxylase derived from Spathaspora passalidarum.