9 results about "Chlorine.free" patented technology

The utility model belongs to the technical field of chlorine-free protective covers, and discloses a machine tool guide rail chlorine-free protective cover which comprises a sliding rail frame end and a sliding rail body, a threaded groove is formed in the left side of the sliding rail frame end, a bolt pin is spirally connected into the threaded groove of the sliding rail frame end, and a supporting frame is arranged on the left side of the sliding rail frame end in an iron fit mode. The outer side of the bolt pin penetrates through the interior of the supporting frame and is in spiral connection with the interior of a threaded groove in the end of the sliding rail frame, a square groove is formed in the left side of the supporting frame, a buckle base is fixedly connected to the interior of the square groove of the supporting frame, an abutting frame is fixedly connected to the left side of the buckle base, an elastic piece is fixedly connected to the interior of the abutting frame, and a protruding block is arranged on the outer side of the elastic piece in an abutting mode; by means of the scheme, the problems that the protective cover is bonded through hot melting, the protective cover is prone to falling off, pollutants such as cuttings and cooling liquid enter the guide rail, abrasion of the guide rail is increased, the service life of the machine tool guide rail is shortened, and operators are injured due to accidental contact with the guide rail when maintenance personnel conduct maintenance are solved.

The application discloses a paper pulp chlorine-free bleaching method, which comprises the following steps: 1) ozone bleaching to obtain ozone-bleached paper pulp; 2) hydrogen peroxide bleaching to obtain hydrogen peroxide-bleached paper pulp; 3) chelation treatment to obtain chelation-treated paper pulp; and 4) hydrogen peroxide bleaching to obtain bleached pulp. The paper pulp chlorine-free bleaching method has the advantages of low temperature, normal pressure, low energy consumption, low cost, high efficiency, suitability for various paper pulp systems, green environmental protection and the like, and the bleached paper pulp has high whiteness, high viscosity, low Kappa number and no AOX; and the method is suitable for large-scale industrial application.

The application discloses a kind of chlorine-free environment-friendly coal transportation and storage antifreeze and preparation method thereof, belong to coal storage and transportation technical field, the preparation method of the chlorine-free environment-friendly coal transportation and storage antifreeze, comprising the following steps: natural oil is heated and stirred, vacuum dewatering is carried out, then amine compound is added to modify reaction, after reaction is finished, cooling is obtained Intermediate product 1, water, thickening agent and metal corrosion inhibitor are added to it again, stir uniformly, obtain the chlorine-free environment-friendly coal transportation and storage antifreeze.I.e. the antifreeze prepared in the application forms weak interface on the surface of coal and carriage or warehouse, is easy to destroy, prevents "freezing vehicle phenomenon";And no chlorine component is used, fundamentally eliminates the corrosion problem caused by chloride ion;It is relatively simple to clean simultaneously because it has certain emulsifying capacity itself;And raw material is more natural oil or recycled oil, with the advantages of green environmental protection.

This invention relates to the field of PETG co-extruded flooring technology, and more particularly to a chlorine-free and environmentally friendly PETG co-extruded flooring and its preparation method. The aforementioned chlorine-free and environmentally friendly PETG co-extruded flooring comprises: a PETG substrate layer, a color film layer covering the surface of the PETG substrate layer, and a wear-resistant layer covering the surface of the color film layer. The raw materials of the PETG substrate layer, by weight, include: 100-150 parts of polyethylene terephthalate-1,4-cyclohexanediol ester, 5-15 parts of thermoplastic polyurethane, 20-40 parts of activated fly ash, 1-2 parts of maleic anhydride-grafted SEBS, 150-200 parts of stone powder, 1-3 parts of oxidized polyethylene wax, 5-10 parts of plasticizer, 1-3 parts of colorant, 1-2 parts of stearic acid, and 1-2 parts of stabilizer. This invention is entirely chlorine-free, thus both utilizing industrial solid waste and providing the product with a higher cost-performance ratio.

The invention belongs to the technical field of papermaking chemicals, discloses an efficient and environment-friendly chlorine-free water repellent agent and a preparation method thereof, and aims to solve the problems of volatile organic compounds and adsorbable organic halides in production and application of a traditional papermaking water repellent agent. The preparation method comprises the following steps: dissolving urea in water under the protection of inert gas, and adjusting the pH value of the system to 9-11 by using an alkali solution; adding polyepoxy glycidyl ether such as ethylene glycol diglycidyl ether and glycerol glycidyl ether, and reacting at 50-75 DEG C for 1-2 hours; adding glycerol, pentaerythritol and other polyhydric alcohols, and continuously reacting at 60-85 DEG C for 2-3 hours; finally, deionized water is added to adjust the solid content to 50%, and the chlorine-free water repellent agent is prepared. Formaldehyde and organic halide are not used in the preparation process, the release risk of harmful substances is avoided, meanwhile, the paper is endowed with excellent wet friction resistance, the preparation process conditions are mild, and industrial production is easy.

The invention provides a method for refining bamboo wood dissolving pulp by an enzyme synergistic eutectic solvent. The method comprises the following steps: immersing bamboo powder in an enzyme preparation solution, and carrying out pretreatment, filtration, washing and drying to obtain a solid-phase material; and mixing the solid-phase material with the deep eutectic solvent, carrying out reaction and solid-liquid separation, and carrying out washing, chlorine-free bleaching and drying on the obtained solid to obtain the dissolving pulp. According to the brand new technical scheme, enzyme selective catalysis pretreatment and deep eutectic solvent treatment are organically coordinated, and high-yield, high-quality and clean preparation of the bamboo wood dissolving pulp is expected to be achieved under the mild condition. The core idea of the method is that the hemicellulose and lignin in the bamboo wood are precisely pre-degraded by utilizing high specificity and mildness of enzyme biological catalysis, so that the pulping effect of the subsequent eutectic solvent is coordinated and enhanced.

The present application relates to a kind of cotton linter pulp chlorine-free bleaching agent and bleaching method, by mass fraction, including persulfate 1.4~7.9 parts, pyrophosphate 2.7~9.2 parts, polyphosphate 1.4~7.9 parts, anionic surfactant 1.4~7.9 parts, 1000 parts of water;The pH of the bleaching agent is 8.5~11.0.The present application is mainly used as persulfate, and low pollution bleaching agent is formed by being matched with pyrophosphate, polyphosphate, anionic surfactant, with good bleaching effect, can effectively remove the colored material attached to cellulose, the degree of damage to cellulose is small, the obtained refined cotton whiteness is above 70, the degree of polymerization is above 1000, the relative unbleached cotton linter pulp is reduced by 15%~64%, without bleaching terminator;The bleaching method of the present application is mild, does not contain chlorine element, reduces pollution load, the COD content in waste liquid after bleaching is below 280 mg / L, green environmental protection.

The invention relates to the technical field of polishing pad materials, in particular to a chloride-free polyurethane polishing pad material and a production method thereof.The production method comprises the following steps that 1, diphenylmethane diisocyanate and polytetrahydrofuran are stirred to be uniform to react, vacuum defoaming is conducted, and a polyurethane prepolymer is obtained; 2, mixing and stirring the polyurethane prepolymer, the modified porous glass beads and a foaming agent, and performing vacuum defoaming to obtain a component A; uniformly mixing and stirring a chain extender, modified graphene oxide and carbon black to obtain a component B; and step 3, uniformly mixing the component A and the component B, pouring the mixture into a mold, and carrying out gradient heating curing, demolding and curing to obtain the chlorine-free polyurethane polishing pad material. According to the chlorine-free polyurethane polishing pad material prepared by the preparation method disclosed by the invention, the harm of free isocyanate is eliminated, and no chloride ions exist, so that the production process is safer and more reliable, and the chlorine-free polyurethane polishing pad material has the characteristic of recyclability and realizes high-efficiency, stable, long-life and environment-friendly precise polishing operation.