45results about How to "Increase the phenolic hydroxyl content" patented technology

The invention discloses methods for producing corrugated paper, natural gas and organic fertilizer from straws. The method for producing the corrugated paper includes: (1) cutting the straws; (2) dedusting by a dry method; (3) dedusting by a water membrane; (4) extracting and washing with hot water to remove sand; (5) hydrolyzing by continuous steaming; (6) sprinkling and collecting; (7) backwashing in multiple stages; (8) grinding into high-concentration liquid firstly; (9) ripening; (10) grinding into high-concentration liquid and low-concentration liquid; (11) producing the corrugated paper. The method for producing the natural gas includes the steps of: (1) subjecting high-concentration wastewater to anaerobic treatment; (2) subjecting the treated wastewater to aerobic treatment; (3) purifying marsh gas obtained from anaerobic treatment to obtain the natural gas. The method for producing the organic fertilizer is also provided. The methods for producing the corrugated paper, the natural gas and the organic fertilizer from straws are environmentally friendly, the wastewater obtained in the processes can be recycled, self-producing capability of pulp for industrial packing paperincluding the corrugated paper and the like can be improved, the difficulty of fibrous material shortage in our country can be alleviated, and reliance on imported waste paper can be reduced.

The invention discloses demethylated lignin as well as a preparation method and application thereof in a phenolic resin adhesive. The demethylated lignin is obtained by reacting lignin with laccase ina solvent. The lignin is demethylated through the laccase, so that the content of phenolic hydroxyl groups on lignin molecules is increased, activation sites reacting with formaldehyde in the ligninmolecular structure are increased, the activity is higher, and the reactivity with formaldehyde is higher. Meanwhile, the laccase used in the lignin demethylation process is a biocatalyst, has the advantages of being easy and convenient to operate and environmentally friendly, avoids the use of high-temperature and high-pressure reaction conditions and environment-friendly reagents, and is beneficial to production of downstream phenolic aldehyde adhesives. Moreover, due to the fact that the reaction activity of the demethylated lignin is improved, compared with a phenolic resin adhesive prepared from unmodified lignin, the modified phenolic resin adhesive prepared from the demethylated lignin has the advantages that the gelation time is shortened, the resin activity is improved, the formaldehyde release amount is reduced, and the bonding strength is improved.

The invention discloses a method for increasing the content of a phenol hydroxyl of lignosulfonate by ultrasonic waves and application. The method comprises the steps that lignosulfonate is dissolved in water, the pH value of lignosulfonate is regulated to be 0-4, and stirring is performed, so that lignosulfonate is dispersed or dissolved fully, and a lignosulfonate solution is obtained; the ultrasonic waves with a service power ranging between 150W and 300W and a frequency ranging between 20kHz and 40kHz at the temperature ranging between 20 DEGC and 30 DEG C act on the lignosulfonate solution for 60-120min, and natural cooling is performed; and the cooled ultrasonic reaction solution is subjected to reduced pressure distillation and constant-temperature drying, so that lignosulfonate with increased content of the phenol hydroxyl is obtained. The method is mild in reaction condition, low in cost and environment-friendly, can be operated easily, and has a broad application prospect.

The invention discloses an environment-friendly anti-radiation photovoltaic cable used for solar energy power generation, which includes a cable core and a sheath layer coating the cable core, wherein the sheath layer includes, by weight, 20-40 parts of EVA resin, 15-25 parts of chloroprene rubber, 15-30 parts of hydrogenated nitrile butadiene rubber, 15-35 parts of micro powder of silicon carbide, 8-12 parts of bentonite, 10-20 parts of zeolite powder, 10-20 parts of lignin, 45-65 parts of rice hull powder, 10-20 parts of barite powder, 15-22 parts of modified sodium lignin sulfonate, 1-1.5 parts of white oil, 0.8-1.6 parts of an anti-aging agent 2246, 0.8-1.6 parts of an anti-aging agent SP, 3-6 parts of benzoyl peroxide, 2-5 parts of an anti-coking agent CTP, 0.4-0.8 parts of an accelerator PZ, 0.3-0.7 parts of an accelerator TMTD, 1-1.8 parts of zinc oxide, 1.5-2.2 parts of disproportionated rosin, 1.5-3.5 parts of a softener DOP, 1.5-2.5 parts of epoxy soybean oil and the like.

The invention discloses a preparation method for preparing a lignin phenolic resin adhesive by using activated lignin to replace part of phenol to react with formaldehyde. The preparation method comprises the following steps: treating papermaking waste liquid with microwave and CuO, then filtering, adjusting the pH value to be about 2-3 by using hydrochloric acid, putting into a drying oven, standing for a period of time at a set temperature, filtering while the liquid is hot, washing to be neutral, and drying to obtain acidified lignin for later use; and taking the dried lignin to replace part of phenol, and performing phenolization, hydroxymethylation and phenolic reaction to prepare the lignin phenolic resin adhesive. By using the method disclosed by the invention, the replacement rate of phenol by lignin is improved, the cost is reduced, the pollution to the environment is reduced, the adhesive is high in bonding strength and low in free formaldehyde content, and various properties of the adhesive accord with national standards.

The invention belongs to the field of improvement of reaction activity of alkali lignin, and discloses a method for improving the amination modification efficiency or phenolic hydroxyl group content of alkali lignin, which comprises the following preparation steps: adding lignin into a deep eutectic solvent system (a choline chloride / urea system, a choline chloride / glycerol system and a choline chloride / acetic acid system), uniformly mixing, carrying out heating treatment, adjusting the pretreatment temperature, adding deionized water to terminate the reaction after stirring treatment is conducted for a period of time, then performing centrifugation and freeze drying to obtain the pretreated alkali lignin, carrying out reduced pressure distillation to recover the deep-eutectic solvent system, or transferring the reaction system treated by the deep-eutectic solvent system into a dilute acid solution, continuing to mechanically stir for a period of time, and then centrifuging and vacuum drying to obtain the pretreated industrial alkali lignin. The solvent used in the pretreatment method is green and environment-friendly, can be recycled, and is free of pollution, and the method is simple in process, is easy to operate, is suitable for industrial production, and has a good application prospect.

The invention discloses a method for increasing the content of a phenol hydroxyl of lignosulfonate by ultrasonic waves and application. The method comprises the steps that lignosulfonate is dissolved in water, the pH value of lignosulfonate is regulated to be 0-4, and stirring is performed, so that lignosulfonate is dispersed or dissolved fully, and a lignosulfonate solution is obtained; the ultrasonic waves with a service power ranging between 150W and 300W and a frequency ranging between 20kHz and 40kHz at the temperature ranging between 20 DEGC and 30 DEG C act on the lignosulfonate solution for 60-120min, and natural cooling is performed; and the cooled ultrasonic reaction solution is subjected to reduced pressure distillation and constant-temperature drying, so that lignosulfonate with increased content of the phenol hydroxyl is obtained. The method is mild in reaction condition, low in cost and environment-friendly, can be operated easily, and has a broad application prospect.

The invention relates to a straw comprehensive utilization method, and belongs to the technical field of biomass raw material comprehensive utilization. The method mainly comprises the following key steps: straw cutting treatment, dry-process dedusting, hot-water washing for sand removing, continuous cooking, spraying and receiving, multi-stage countercurrent washing, multi-stage high-concentration pulp grinding, fiber classification treatment, long-fiber concentration, long-fiber curing treatment, long-fiber pulp grinding and production of corrugated paper through long fibers, short-fiber concentration, and enzymolysis, fermentation and distillation of short fibers for production of fuel ethanol and solid granular fuel. The method has the beneficial effects that high-value comprehensive utilization of all components of the straw material is realized, chemicals are not added, a water system is closed and circulated, and the zero discharge of wastewater is realized; the specific surfacearea of a fine fiber component is large, and the enzymolysis efficiency is high; corrugated paper produced by the long fiber component is high in strength and good in quality; when the fine fiber component is used for an enzymolysis system, not only is the enzymolysis property of the material improved, but also the cost of enzymolysis sugar is greatly reduced, so that the development of a biomasscomprehensive utilization technology is promoted.

A process for preparing a series of phenolic substances includes such steps as dissolving the lignin powder recovered from waste pulp liquid in solvent, adding catalyst, high-temp and-pressure hydrogenating to obtain a series of compounds, and classifying.

The invention discloses an antistatic high-strength polyacrylonitrile fiber and a preparation method thereof, and relates to the technical field of fiber modification. When the anti-static high-strength polyacrylonitrile fiber is prepared, a polyacrylonitrile fiber matrix prepared through electrostatic spinning and irradiation crosslinking is hydrolyzed, then phosphorylated polyvinyl alcohol is introduced, then poly (3-thiopheneacetic acid) hydrogel is coated, and finally freeze drying is conducted to obtain the anti-static high-strength polyacrylonitrile fiber. Phenolated lignin is added into an electrostatic spinning solution, so that the tensile strength of the polyacrylonitrile fiber is enhanced; the phosphorylated polyvinyl alcohol can form a film on the surface of the polyacrylonitrile fiber to enhance the tensile strength of the polyacrylonitrile fiber, the poly (3-thiopheneacetic acid) hydrogel coats the surface of the polyacrylonitrile fiber to enhance the air permeability of the fiber, and then freeze drying is performed, so that the fiber has antistatic property and the air permeability is enhanced.

The invention discloses a method capable of improving thermostability and flame retardance of PVC through a nano magnesium borate / lignin composite material. The method includes following steps: (1), using dioctyl phthalate (DOP) as a plasticizer to hydrophobically modify the composite material; (2), well mixing the hydrophobically modified composite material with PVC powder, and performing plasticizing modification; (3), banburying a mixed material obtained by plasticizing modification in a banbury mixer; (4), performing hot-press forming on a mixed material obtained by banbury to obtain a PVCformed material. The composite material synthesized in situ and DOP are used as an enhancer and a plasticizer respectively, so that thermostability and flame retardance of the PVC formed material areimproved remarkably.

The invention discloses a preparation method of a lignin-based resorcinol-phenol-formaldehyde resin adhesive. The preparation method comprises dissolving a basic catalyst in water, heating the solution to 70 to 75 DEG C, adding lignin and phenol into the solution, carrying out uniform mixing, heating the mixture to 90-95 DEG C for a phenolization reaction for 1-1.5h, cooling the mixed solution to 70-85 DEG C, supplying a basic catalyst aqueous solution, adding a formaldehyde aqueous solution into the catalyst aqueous solution, carrying out a primary polycondensation reaction process at 70-85 DEG C for 45-60min, cooling the prepared solution to 55-65 DEG C, adding a resorcinol aqueous solution into the cooled solution, carrying out a secondary polycondensation reaction at 55-65 DEG C for 60-150min and cooling the product to the room temperature. The preparation method pretreats lignin through phenolization and improves phenolic hydroxyl group content of lignin. The preparation method utilizes high activity resorcinol. The lignin-based resorcinol-phenol-formaldehyde resin adhesive has a low curing temperature and short curing time.

The invention discloses a 4-tert-alkylphenol-(phenol-based) formaldehyde resin and its preparation method and application. It is prepared from p-hydroxybenzaldehyde and 4-tert-alkylphenol through condensation and polycondensation reactions. The method of the invention has simple operation, easy implementation, mild conditions, no high pressure, high safety, strong controllability, high product yield, good quality, energy saving and environmental protection. The methyl groups of the obtained resin are connected with phenol groups, which increases the content of phenolic hydroxyl groups per unit mass of the tackifying resin. The resin is especially suitable for use as a long-term tackifying resin for rubber in the manufacture and production of tires. The initial viscosity and viscous lasting power of the sizing material added with the resin of the present invention are greatly improved, can reduce the defective rate of tires or rubber products, can improve the quality of tires or rubber products, reduce production costs and increase production efficiency, and have great advantages. Good economic and social benefits.