34 results about "Free phenol" patented technology

The invention provides a fruit juice fermentation inoculant, fermented guava juice and a preparation method, and belongs to the technical field of fermented beverages. The invention provides a compound fermentation inoculant capable of fermenting fruit juice, the compound fermentation inoculant is composed of lactobacillus plantarum and lactobacillus fermentum, the fermentation inoculant is applied to fermentation of guava fruit juice, beta-glucosidase secreted in the fermentation process can hydrolyze combined polyphenol substances in guavas, and then the guava fruit juice is fermented. The antioxidant is converted into high-activity antioxidants such as quercetin and gallic acid in a free state, so that the content of free phenol is increased by about 2 times, and the scavenging rate of DPPH free radicals is increased by more than 40%. The fermentation is carried out in an oxygen-free environment, the retention rate of vitamin C can reach 80% or above, the low pH value at the fermentation end point and organic acid jointly inhibit pathogenic microorganisms, and the product stability is guaranteed. Therefore, the guava juice prepared from the compound fermentation inoculant maximally releases the natural nutritional potential of guavas.

The present invention relates to a standardized plant extract of biomass from an in vitro culture of Brassica granatum, containing biologically active compounds and their primary and secondary metabolites, comprising, in% by weight: 4.0 to 6.0 organic acids, 0.5 to 1.5 fatty acids, 8.0 to 12.0 amino acids, 0.5 to 1.0 sterols, 3.0 to 6.0 free phenols, 45 to 55 sugars and 25.0 to 35.0 polyphenols, wherein the content of major mannose glycosides in the polyphenol fraction is 70-96%, making up 18%-35% of the total extract, and to compositions containing the standardized extract and glycerol and to methods for preparing standardized plant extracts. According to the method of the invention, along with the optimally selected steps, specific conditions, parameters such as temperature, duration, agitation, light, growth factors and the like, maximum volume productivity of the target substance and mannoside and stable productivity of in vitro plant cultures are achieved, and the method is a reliable and effective 24 / 7 continuous system for the production of NP.

The invention refers to standardized plant extract from biomass of in vitro cultures of Haberlea rhodopensis Friv. (HR), containing bioactive compounds and their primary secondary metabolites, containing in weight %, as follows: organic acid from 4.0 to 6.0, fatty acids from 0.5 to 1.5, amino acids from 8.0 to 12.0, sterols from 0.5 to 1.0, free phenols from 3.0 to 6.0, sugars from 45 to 55, and polyphenols from 25.0 to 35.0, with a predominant myconoside content of 70% to 96% in the polyphenolic fraction, constituting 18% to 35% of the total extract, and to a composition containing the standardized extract and glycerol as well as to a method for the preparation of a standardized plant extract.The method according this invention, along with its optimally chosen steps, specific conditions, parameters such as temperature, duration, stirring, light, growth factors, etc. achieves both maximum volumetric productivity of the target substances and myconoside, as well as stable productivity of the plant in vitro cultures and is a reliable efficient 24 / 7 continuous system for production of NPs.Dependence on natural factors, limited availability and protection of HR rare wild plant populations are eliminated. The limitations posed by seasonality and slow HR growth are also avoided by developing a renewable, ecologically method. The developed method provides alternative, renewable and sustainable sources of raw plant material necessary to obtain the target extract. The resulting extract standardized in myconoside is especially valuable with its protective action on human health and can successfully be used with its pharmacological, cosmetic effects as well as in functional foods.

The invention discloses a self-adaptive springback polyurethane sound insulation earplug with low oppression sense and belongs to the technical field of polyurethane, the polyurethane sound insulation earplug is of a bullet-shaped or bell-shaped structure and comprises a front section and a rear section from the top end to the bottom in the axial direction, the front section is made of self-adaptive springback antibacterial modified polyurethane, and the rear section is made of self-adaptive springback antibacterial modified polyurethane. The rear section is high-density hydrophobic modified polyurethane, and the front section layer adopts a disulfide bond-containing polyether polyol and resveratrol modified system, so that the synergism of antibiosis, antioxidation and self-adaptive resilience is realized; the rear section layer is made of high-density hydrophobic polyurethane, and supporting and stain-resistant functions are provided. The two layers form an integrated structure through in-situ chemical bonding, mild alkali treatment is performed for deprotection after molding, free phenolic hydroxyl groups of resveratrol are recovered, and lasting antibacterial activity is endowed.

The invention provides a novel lubricating oil detergent, a preparation method thereof and a lubricating oil composition. The preparation method comprises the following steps: mixing alkylphenol, base oil, a vulcanizing agent and a first part of calcium source, adding a first part of accelerant, and carrying out vulcanization reaction; then adding cyclic anhydride to carry out esterification reaction; and adding a second part of accelerant and a second part of calcium source, then carrying out carbonation reaction, and purifying the product after the reaction is finished to obtain the novel lubricating oil detergent. Wherein the cyclic anhydride is selected from one or a combination of more than two of maleic anhydride, succinic anhydride, adipic anhydride and phthalic anhydride; the addition amount of the cyclic anhydride is 0.01-0.25 part by weight based on 1 part by weight of alkylphenol. The cyclic anhydride participates in the reaction, so that the content of free phenol in the product can be reduced, and the wear resistance of the product can be improved. The novel lubricating oil detergent provided by the invention has no free phenol residue, and has more excellent detergency, oxidation resistance, wear resistance and the like.

The invention relates to the technical field of polymer synthesis, and discloses a finely-controlled optical-grade polycarbonate (PC) polymerization method, optical-grade polycarbonate and application thereof. The method comprises the following steps: in an inert atmosphere, mixing bisphenol A, diphenyl carbonate and a composite catalyst for condensation polymerization, the composite catalyst contains sodium tetraphenylborate and nano cerium dioxide; the polycondensation reaction comprises three stages of gradient heating reactions, and the first stage reaction is that the reaction is carried out for 1-2 hours at 180-200 DEG C under normal pressure; in the second-stage reaction, the reaction is carried out for 3-4 hours at 220-240 DEG C and 10-15 kPa; and the third-stage reaction is as follows: the reaction is performed at 250-260 DEG C and less than 5kPa until the intrinsic viscosity of the reaction system reaches 0.5-0.6 dL / g. According to the method, the optical-grade polycarbonate with high light transmittance, low chroma, narrow molecular weight distribution and low free phenol content can be prepared.

The invention provides a manufacturing process of styrene-butadiene latex modified hot-melt phenolic resin, and relates to the technical field of high polymer materials, and the manufacturing process comprises the following steps: firstly, adding accurately metered phenol and a formaldehyde solution with a specific concentration into a reaction kettle provided with an intelligent temperature control and stirring system, adding an oxalic acid catalyst, and carrying out a multi-stage temperature control reaction to obtain a phenolic resin prepolymer; then, adding a proper amount of styrene-butadiene latex into the prepolymer, and raising the temperature to continue the reaction; cooling after the reaction is finished, adding a curing agent, uniformly stirring, and pouring into a specially treated mold for curing. An online monitoring device is introduced in the manufacturing process, and reaction conditions are adjusted in real time. The modified phenolic resin prepared by the process is excellent in performance, high in softening point, low in free phenol content and high in tensile strength and bending strength. The process is high in controllability, all links are accurately controlled through an advanced technology, the product quality and performance are effectively improved, powerful support is provided for application and expansion of phenolic resin, and the method has wide application prospects in numerous industrial fields.

The invention relates to a high-strength phenolic moulding compound for an automobile brake piston and a preparation method of the phenolic moulding compound. The phenolic moulding compound is prepared from the following raw materials: thermosetting phenolic resin, thermoplastic phenolic resin, glass fibers, wollastonite fiber powder, active whisker silicon, iron oxide pigment, a curing agent, a curing accelerator and a release agent. Wherein the thermosetting phenolic resin is obtained by feeding and reacting phenol and formaldehyde according to a molar ratio of 1: (1.90-1.95), the softening point of the thermosetting phenolic resin is 65-75 DEG C, the free phenol content is less than or equal to 5.5%, and the polymerization speed is 35-80S. The preparation method comprises the following steps: mixing the raw materials except for the glass fiber, and crushing the mixture at the temperature of less than 20 DEG C until the fineness is 100 meshes, so as to obtain a mixture; and uniformly mixing the mixture with the glass fiber, heating and mixing or extruding, and finally granulating and forming to obtain the glass fiber reinforced plastic. The high-aldehyde-ratio thermosetting phenolic resin is used as a main adhesive, so that the high-temperature performance is excellent, and the size can be stabilized; fiber fillers with three particle sizes are used, so that the strength, hardness and wear resistance of a workpiece are improved; the resin system is tightly combined, so that the product is water-resistant and solvent-resistant, and the application is expanded.

This invention relates to a method for improving the intestinal tolerance of wheat bran dietary fiber based on synergistic modification by microorganisms and enzymes. The method includes ultra-fine grinding and high-pressure moist heat activation of wheat bran; multi-enzyme synergistic microbial stepwise treatment, first using high-temperature amylase and neutral protease to remove interfering components such as starch and protein, then using laccase to degrade lignin, resulting in a looser structure; subsequently, phytase efficiently degrades phytic acid, Aspergillus nidulan degrades the side chains of arabinogalactan, and snail enzyme and ferulic acid esterase work synergistically to convert insoluble arabinoxylan into soluble dietary fiber and release phenolic antioxidants. This method increases the soluble dietary fiber content of wheat bran by 2 times, reduces phytic acid to 10 mg / g, increases free phenolic acid content by 40%, achieves a DPPH free radical scavenging rate of 60%, significantly enhances antioxidant activity, and significantly reduces IgG levels in mouse models compared to those consuming unmodified wheat bran, thus improving intestinal tolerance and probiotic function; the product can be used as a high-quality functional food ingredient.

The invention discloses moisture-absorption-resistant environment-friendly precoated sand and a preparation method thereof. According to the invention, long-chain alkyl trialkoxysilane and an epoxy silane coupling agent are subjected to co-hydrolytic polycondensation under an acidic condition, such that the organosilicon hydrophobic agent with epoxy reaction activity is prepared. And then in a film coating process, the surface of hot sand is coated with the hydrophobic agent, then thermosetting phenolic resin and a curing agent are sequentially added, and a final product is obtained after mixing, grinding, cooling and crushing. According to the method, a hydrophobic interface layer anchored through chemical bonds is constructed between sand grains and resin, a stable physical water blocking barrier is formed through long-chain alkyl, firm interface combination is achieved through active group reaction, and therefore the moisture absorption resistance of the precoated sand is fundamentally improved. Meanwhile, the environment-friendly resin with low free formaldehyde and low free phenol is combined, so that the gas forming amount of the product is remarkably reduced.

The invention discloses a preparation method for improving the extraction efficiency and fidelity of plant combined polyphenol, and relates to the field of functional food preparation. The extraction method comprises the following steps: 1, adding a raw material into an acetone aqueous solution, shaking at room temperature or homogenizing to extract free phenol, and carrying out residue-liquid separation to obtain a raw material without the free phenol; 2, adding a sodium hydroxide solution and an organic solvent which is immiscible with water into the raw material without the free phenol; 3, after room-temperature shaking extraction, collecting an upper-layer organic phase, and adjusting the pH value of a lower-layer water phase to 1.0-2.0; 4, extracting the water phase by using ethyl acetate; and 5, combining the upper organic phase and the ethyl acetate phase, and carrying out vacuum concentration and drying to obtain the combined polyphenol extract. Compared with a conventional combined polyphenol extraction method, the combined polyphenol extraction method established by the invention can effectively improve the extraction efficiency of the combined polyphenol in the raw materials, and can reduce the degradation of combined polyphenol substances to ensure the authenticity of the combined polyphenol.

A myconoside containing extract is derived from in vitro systems of plants belonging to the family Gesneriaceae, in particular from the genera Haberlea and Ramonda, also including the species Haberlea rhodopensis Friv., Ramonda heldreichii (Boiss.) C. B. Clarke; Ramonda myconi (L.) Rchb.; Ramonda nathaliae Pancic & Petrovic, and Ramonda serbica Pancic, as well as from their hybrids. The extract is used in human and veterinary medicine, nutritional supplements and cosmetics as chemo-, radic- and UV protector. Extract 1 comprises 0.1 to 55.0 wt % PHE and free phenols, sugars, organic-, fatty- and amino acids, sterols up to 100 wt %, while Extract 2 comprises 55.0 to 99.9 wt % of PHE (in particular, myconoside and paucifloside), and phenolic compounds, mono-, disaccharides or their residues up to 100 wt %. Extracts 1 and 2 obtained according to this invention mainly consist of RHE (in particular, myconoside and paucifloside) within a broad spectrum and quantitative limits.

The application discloses a modified phenolic resin and a preparation method thereof, and a rubber composition, and belongs to the rubber material field. The preparation method of the modified phenolic resin comprises the following steps: performing one-stage condensation reaction on a phenolic compound and a first-stage aldehyde, and then performing one-stage dehydration treatment to obtain a first-stage resin; and performing two-stage condensation reaction on the first-stage resin, a second-stage aldehyde and lignin to obtain the modified phenolic resin. The preparation method provided in the application embodiment adds lignin to modify the phenolic resin, realizes effective utilization of the natural resource of lignin, and enables the modified phenolic resin to better improve the adhesive property while keeping good mechanical property and vulcanization property when being applied to rubber and other reinforcing adhesive materials. Meanwhile, the specific step-by-step preparation process effectively improves the reaction activity and efficiency of the lignin, can improve the modification effect, and can effectively reduce the free phenol content in the modified phenolic resin, which is beneficial to better application of the modified phenolic resin.

The invention relates to a preparation method of sulfurized alkylphenate. The oxidation resistance of the obtained sulfurized alkylphenate is remarkably improved, and the content of free phenol is reduced to 2% or below.

The invention belongs to the crossing field of plant-based food and nanotechnology, and particularly relates to a vitamin E-coffee nanoparticle compound as well as a preparation method and application thereof, the vitamin E-coffee nanoparticle compound comprises coffee nanoparticles and vitamin E loaded on the surfaces of the coffee nanoparticles; wherein the coffee nanoparticles are nanoscale particles separated from a coffee extracting solution, and the coffee nanoparticles naturally carry polyphenol compounds; the vitamin E is loaded on the surfaces of the coffee nanoparticles through non-covalent acting force. The vitamin E-coffee nanoparticle compound is used for replacing a traditional coffee polyphenol extract, so that the problems of protein aggregation, precipitation and phase separation caused by interaction of free phenolic acid and vegetable protein are effectively avoided, and the product can be kept in a uniform colloidal state for a long time in the storage period. Meanwhile, the dispersity and the stability of the fat-soluble vitamin E in a water-phase system are greatly improved, and coffee polyphenol carried by the fat-soluble vitamin E is also retained.

The invention discloses a method for characterizing gastrointestinal digestion characteristics of phenolic substances in fermented red date juice, which comprises the following steps of: simulating a gastrointestinal digestion model in vitro, sampling a stomach phase and an intestine phase of a fermented product at different times, measuring the content of free phenol, bound phenol and total phenol and antioxidant activity, calculating digestion stability and bioaccessibility, and constructing multiple characterization thresholds. Operation is simple, and repeatability is good.

The present application relates to a kind of preparation methods of high purity tert-butylated triphenyl phosphate, belong to flame retardant production technical field, comprising the following steps, with first part of phosphorus oxychloride is mixed with tert-butyl phenol, after heating and melting, obtain mixed solution, standby.This high purity tert-butylated triphenyl phosphate preparation method, using step-by-step reaction and twice negative pressure distillation process, significantly reduce the formation of harmful by-product triphenyl phosphate, the content of triphenyl phosphate in product can be reduced to 1% or less, can be as low as 0.57%, by optimizing catalyst type and caustic wash condition, product is colorless or slightly yellow transparent state, product acid value is as low as 0.01~0.02mgKOH / g, free phenol content is less than 0.01%, using magnesium chloride instead of traditional aluminium chloride, dosage is only 0.1%~0.2%, catalytic effect is good, product yield can be as high as 98% or more, hydrogen chloride gas produced in the reaction process is absorbed to form by-product hydrochloric acid, reduce "three wastes" emissions.

The invention relates to the technical field of preparation of chemical treatment agents, in particular to a preparation method of an anti-deformation treatment agent for plywood. The problem that an anti-deformation treatment agent is poor in anti-deformation durability is solved. Soybean oil is epoxidized through hydrogen peroxide and formic acid to prepare bio-based epoxy resin, an epoxy group of the bio-based epoxy resin and hydroxyl of wood cellulose are subjected to nucleophilic ring opening crosslinking to form a three-dimensional hydrogen bond network, meanwhile, a bio-based polyol flexible chain segment synthesized by castor oil epoxy resin and triethanolamine is fused, and the impact resistance and construction permeability are improved; and then fusing with formaldehyde-free phenolic resin obtained by catalytic condensation of alkaline lignin through glyoxal base to realize zero formaldehyde release and compatibility with plywood raw materials and enhance durable shear strength. During hybridization, a chitosan cationic catalyst is added to promote protonation ring opening of epoxy-phenolic hydroxyl groups and bonding of a silane coupling agent bridging interface, a uniform network is formed, warping and water absorption rate are reduced synergistically, and a water contact angle is increased. No volatile organic compound exists in the whole process, and plywood standards are met.

The invention discloses an echelon preparation device and process of litchi pomace polyphenol and dietary fiber, and belongs to the technical field of agricultural waste resource utilization. The device comprises an extraction tank, a column chromatography module, a screw lifter, an ultrasonic probe and a liquid outlet, the process specifically comprises the following steps: (1) adding litchi pomace and choline chloride-glycerol into an extraction tank, extracting free phenol under the assistance of an ultrasonic probe, synchronously adsorbing and separating the free phenol by using a column chromatography module, and recovering the choline chloride-glycerol; and (2) adding choline chloride-malonic acid into the extraction tank, extracting bound phenols and soluble dietary fibers in the residues, carrying out alcohol precipitation treatment on a supernatant solution to respectively obtain bound phenols and soluble dietary fibers, and taking residual residues as insoluble dietary fibers. By designing an extraction and purification integrated device and designing a deep eutectic solvent (DES) choline chloride-glycerol and choline chloride-malonic acid in a targeted manner, efficient and echelon preparation of polyphenols and dietary fibers in litchi pomace is realized.

The invention provides a novel lubricating oil detergent as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out alkylation reaction on phenol, long-chain olefin and a solid acid catalyst to obtain a substituted alkylphenol system; the method comprises the following steps: adding an aldehyde compound and a condensation catalyst into a substituted alkylphenol system for condensation reaction to obtain an alkylphenol intermediate; a calcium source, base oil and a solvent are added into the alkylphenol intermediate for a neutralization reaction, an alcohol compound is added after the reaction is finished, then carbonation is performed, a product is subjected to aftertreatment, and the novel lubricating oil detergent is obtained. The novel lubricating oil detergent is free of sulfur and free phenol residues, and has excellent detergency, oxidation resistance and corrosion resistance.

The invention relates to a method for synthesizing high-carbon phenolic resin and extracting ortho-position and para-position alkylphenol, which is applied to the technical field of organic synthesis and separation and comprises the following steps: taking phenol or phenol and ortho-cresol-containing mixed phenol as a first component and at least one of various alkylphenols selected from coal chemical industry crude phenol rectification products as a second component, carrying out segmented polymerization reaction with aldehyde and a catalyst; controlling the reaction until the content of meta-position phenol is less than or equal to 1% and the content of free phenol is 5-30%, and steaming out unreacted phenol; carrying out secondary polymerization and solvent extraction on the distillate, and rectifying to obtain a product containing high-purity phenol and a plurality of ortho-position and para-position alkylphenols; and dehydrating the resin phase to obtain the high-carbon-content phenolic resin. According to the method, petrochemical phenol is partially replaced with cheap coal-based phenol, various high-added-value alkylphenols are co-produced while high-performance phenolic resin is synthesized, and high-value utilization of resources and cost reduction and efficiency improvement of the process are achieved.

The invention relates to the technical field of chemical synthesis, and particularly discloses a method for synthesizing phenolic hydroxyl modified polysiloxane through a phenolic hydroxyl protection-deprotection two-step method. The method comprises the following steps: S1, phenolic hydroxyl group protection: by taking unsaturated olefin phenol as a raw material, carrying out selective protection on hydrogen atoms in phenolic hydroxyl groups by adopting a protective agent to obtain a phenolic hydroxyl group protection type olefin phenol intermediate; s2, hydrosilylation: under the action of a platinum catalyst, carrying out an addition reaction on the intermediate and hydrogen-containing silicone oil in an organic solvent to obtain protective phenolic hydroxyl modified polysiloxane; s3, deprotection: adding a deprotection reagent into the protective phenolic hydroxyl modified polysiloxane for reaction, and separating and purifying to obtain the phenolic hydroxyl modified polysiloxane. According to the invention, the selectivity of hydrosilylation reaction and the product yield are obviously improved, the content of free phenol in the product is low, and the product has the weather resistance of organic silicon and the reaction activity of phenolic hydroxyl groups, and can be widely applied to many fields.

This invention relates to the field of wood adhesives and bioresins, and discloses a large-scale production process for high-adhesion-strength formaldehyde-free bioresin, comprising: pre-treatment of plant phenolic biomass raw materials with wood ash alkali activation to release free phenolic hydroxyl groups; physical adsorption and immobilization of laccase and soybean peroxidase on a bamboo charcoal carrier to obtain a bamboo charcoal dual-enzyme co-immobilized composite; mixing activated phenolic solution with soybean protein isolate solution, adding bamboo charcoal dual-enzyme body and batch-added components to form a phenol-phenol and phenol-protein dual-type covalent cross-linking network; sequentially adding pre-activated dehydrated clinoptilolite and flaxseed gum; coating the obtained adhesive onto a substrate and then hot-pressing and curing, followed by cooling and curing to obtain a dense, microporous-free cured adhesive layer. This invention achieves complete formaldehyde-free adhesive, with adhesive strength reaching the standards for engineering-grade boards, eliminating microporous defects in the hot-pressed adhesive layer, and using raw materials entirely derived from nature or industrial and agricultural by-products, making it suitable for large-scale continuous production.

The present application relates to the technical field of food chemistry processing, and discloses a ginseng fruit juice drink with high clarity and long shelf life and a preparation method thereof, wherein the preparation method comprises the following steps: subjecting fresh ginseng fruits to blanching color protection and acidification pretreatment to obtain pretreated ginseng fruit juice; subjecting free phenolic substances in the fruit juice to oxidative polymerization under the condition of continuous oxygen supply with laccase as a catalyst, removing insoluble polyphenol polymers by centrifugation to obtain depolymerized ginseng fruit juice; preparing TEMPO oxidized nanocellulose with a surface rich in carboxyl groups; adding the above nanocellulose dispersion, honey and streptococcal bacteriocin into the depolymerized fruit juice, and performing membrane filtration to obtain stabilized ginseng fruit juice; performing pasteurization, filling into a packaging container with a composite oxygen barrier inner liner of sodium alginate and beeswax, and cold storage aging to obtain a finished product.

The invention provides a preparation method of modified spinnable phenolic resin, which comprises the following steps: (1) purifying phenolic resin, and removing free phenol and oligomer to obtain phenolic resin with low free phenol content; (2) adding phenolic resin with low free phenol content, a chain high-molecular polymer and an amine cross-linking agent into a stirring kettle, mixing in an inert gas atmosphere, and carrying out segmented heating treatment: heating the raw materials to a molten state at 150-220 DEG C and at a shearing rate of 50-500 s <-1 >, carrying out melt blending, and carrying out cooling to room temperature so as to obtain a mixed material; rigid-chain polymers in the chain-shaped high-molecular polymers are subjected to in-situ fibrillation in the phenolic resin with the low free phenol content, and the block or graft copolymers in the chain-shaped high-molecular polymers and the phenolic resin with the low free phenol content are subjected to microcosmic phase separation; carrying out heat preservation crosslinking at the temperature of 220-260 DEG C; and (3) cooling and slicing to obtain the modified spinnable phenolic resin. The invention further discloses the modified spinnable phenolic resin and application thereof.

This application relates to a free phenol-free lubricating oil composite additive and a marine cylinder oil composition, comprising the following components by weight of the total composite additive: 5-90 wt% calcium sulfonate, 5-50 wt% magnesium sulfonate, 1-20 wt% ashless dispersant, and 1-20 wt% sulfur-containing phenolic antioxidant; wherein, by weight of the total composite additive, the total amount of calcium sulfonate and magnesium sulfonate is 60-95 wt%. This application, through specific selection and proportioning of calcium sulfonate, magnesium sulfonate, ashless dispersant, and sulfur-containing phenolic antioxidant, utilizes the structure-activity relationship between the components to obtain a composite additive with excellent detergency, acid neutralization ability, dispersibility, antioxidant properties, and anti-wear properties without using conventional sulfurized alkylphenol salts and alkyl salicylates.

This invention relates to the field of plant tissue culture technology, specifically a method for culturing *Limonium bicolor* tissue, comprising five steps: explant preparation and sterilization, callus induction culture, adventitious shoot proliferation culture, rooting culture, and hardening-off transplanting. Modified polyvinylpyrrolidone (PVP) and modified chitosan form a composite material through borate ester bonds, which accumulates around the explant. MES maintains pH stability, allowing PPVP to continuously diffuse into the wound. Modified chitosan blocks oxygen from direct contact with the wound surface, protecting endogenous phenols; its catechol groups chelate the PPO cofactor Cu. 2+ Activated carbon adsorbs free phenolic substrates in the culture medium, reducing quinone formation at its source. Modified polyvinylpyrrolidone inhibits PPO catalytic activity; grafted ascorbic acid can reduce already formed o-quinones back to catechol, directly removing brown pigment precursors.

The invention discloses a preparation method of modified phenolic resin, and belongs to the technical field of special phenolic resin of refractory materials. Preparing a precursor; step-by-step polycondensation; and dephenolizing and post-treating. Lignin is activated through a mixed alkaline activator of sodium hydroxide and sodium sulfate, gamma-aminopropyltrimethoxysilane and fly ash are matched to prepare a precursor, step-by-step polycondensation and centrifugal extraction and dephenolization post-treatment are performed through a mixed extraction agent, and the content of free phenol in modified phenolic resin can be effectively reduced; the volatilization of harmful gas in the processes of resin storage and transportation and refractory material mixing, forming and baking is reduced, the pollution to the operation environment is reduced, the potential harm to the respiratory tract and skin health of field personnel is reduced, meanwhile, the requirement for additionally inputting waste gas treatment equipment is reduced, and the total production cost is assisted to be controlled.

The invention relates to a high-temperature synthesis process of a high-yellowing-resistance antioxidant 168, which belongs to the technical field of high polymer material assistants, and comprises the following steps: by taking trialkyl phosphite and 2, 4-di-tert-butylphenol as raw materials, carrying out transesterification under the protection of inert gas and under high-temperature and high-vacuum conditions, and carrying out post-treatment of a film evaporator or a short-path distiller to deeply remove free phenol, thereby obtaining the high-yellowing-resistance antioxidant 168. The antioxidant 168 product is obtained through recrystallization and drying, the content of free 2, 4-di-tert-butylphenol in the product is smaller than or equal to 30 ppm, the yellowing defect caused by antioxidant residues, especially free phenol residues, of high-end products is fundamentally overcome, and the effect is remarkable.

The present invention describes a multi-component polyurethane foam composition comprising: (i) a first component, comprising one or more phenolic resins of the benzyl ether type, wherein a) the first component comprises free phenol and free hydroxybenzyl alcohol, wherein at least about 1.2 parts by weight of free hydroxybenzyl alcohol per 1 part by weight of free phenol are comprised in the first component; and / or b) the first component comprises free phenol and free saligenin (o-hydroxybenzyl alcohol), wherein at least about 1.1 parts by weight of free saligenin (o-hydroxybenzyl alcohol) per 1 part by weight of free phenol are comprised in the first component; (ii) a second component, comprising an isocyanate formulation consisting of one or more isocyanate compounds, wherein at least one isocyanate compound has at least 2 isocyanate groups per molecule; and (iii) optionally, a third component, comprising one or more (halogen)hydrocarbon- containing blowing agents and / or water, wherein, if the multi-component polyurethane foam composition does not include a third component, then the first component comprises at least 0.95% by weight, preferably at least 1.0% by weight, and especially preferably at least 2.0% by weight of water.