39results about How to "Uniform reaction rate" patented technology

A fuel cell having a distributed fuel feed in which the heat generation profile can be better controlled. Fuel channel stack and system efficiency improvements are achieved.

The present invention relates to the field of powder coatings, in particular to a polyester resin for hybrid thermal transfer powder coatings and a preparation method thereof. The polyester resin for hybrid thermal transfer powder coatings includes the following components and content: polyester resin The molar ratio of acid / alcohol is 1 / 1.05-1.20; Wherein the content of each alcohol accounts for the percentage of total alcohol mole number respectively: neopentyl glycol 10-90mol%; 2 methyl 1,3 propanediol 0-45mol%; Glycol 0-20mol%; diethylene glycol 10-25mol%; wherein the content of each acid accounts for the percentage of total acid moles: terephthalic acid 80-100mol%; isophthalic acid 0-10mol%; Acid 0-10mol%; Trimellitic anhydride accounts for 10-15wt% of polyester resin total amount; Compound onium salts account for 0.1-1.0wt% of polyester resin total amount, and the branching component of this polyester resin is passed trimellitic anhydride Adjust the functionality of the polyester resin by adjusting the amount of the polyester resin, the obtained cured film has a better surface appearance, and realizes low-temperature (160°C) curing, and the low-temperature curing rate of the coating film is high, and the cured film has good solvent resistance. The final transfer film is clear and realistic and easy to tear off the paper.

The invention belongs to the technical field of ink emulsion, and in particular relates to a special water-based emulsion for plastic film ink and a preparation method thereof. The water-based emulsion includes the following raw materials in parts by weight: Phase A: 300-400 parts of solid resin, 200-250 parts of deionized water; Phase B: 1-10 parts of reactive emulsifier, 5-15 parts of deionized water; Phase C: 0.5-1.5 parts of initiator, 15-25 parts of deionized water; Phase D: 6-17 parts of crosslinking agent, 10 parts of water ‑20 parts; E phase: 3‑10 parts of crosslinking agent, 25‑35 parts of water; M phase: 310‑370 parts of mixed reaction agent. The water-based emulsion of the present invention has excellent adhesion to non-absorbent substrates PE, BOPP, and PET; the preparation method is easy to operate, and the prepared water-based emulsion has excellent adhesion to films by strictly controlling the addition time and reaction temperature of each raw material. Adhesion, chemical resistance and physical resistance.

A variable-volume soil gas collection device and its use method relate to a soil gas collection device and its use method. The purpose of the present invention is to solve the problem that a plurality of branching units need to be configured when measuring soil respiration to change the measurement volume, resulting in huge cost. The soil gas collection device with variable volume consists of a hard cabin, a soft cabin, a gas conduit and a valve. Methods: 1. Soil loading and device assembly; 2. Equilibrium gas environment; 3. Injecting air; 4. Gas reaction process; 5. Taking gas samples; 6. Gas sample analysis. Advantages: within the limit of the maximum volume range, the volume in the cabin can be continuously changed. It solves the cost of volume switching and reduces the cost of experiments. The invention is mainly used for soil gas collection.

The invention relates to the technical field of coating varnish, in particular to anti-oxidation emulsion and anti-oxidation waterborne coating varnish prepared from the same. The anti-oxidation emulsion is prepared from raw materials in percentage by weight as follows: 30%-50% of an acrylic resin solution with neutral pH, 29%-41% of mixed monomers, 0.5%-1% of an emulsifier, 0.3%-0.8% of an initiator, 0.01%-0.05% of an oxidizing agent, 0.01%-0.05% of a reducing agent and 10%-25% of deionized water, and the sum of the raw materials in percentage by mass is 100%. According to the anti-oxidation emulsion, possibly existing acid-base substances can be reduced, the probability of oxidation is reduced, and hot stamping foil is not prone to oxidation; the anti-oxidation waterborne coating varnish prepared from the anti-oxidation emulsion contains no organic solvents, is low in content of VOCs (volatile organic chemicals) or free of VOCs, is environment-friendly, non-toxic and anti-oxidation, and is suitable for surface lustering of substrates, prone to hot stamping oxidation, of black cardboards, blackened paper, coated black paper and the like.

The invention provides a water-based inorganic zinc-rich paint and a preparation method thereof. The zinc-rich coating uses a high-modulus potassium silicate solution obtained by dropping aluminum-modified silica sol in a low-modulus potassium silicate solution as a binder, and adds catalysts, siloxane oligomers, The modifying agent makes the particle size distribution of the high modulus potassium silicate solution uniform, and the gelation reaction does not occur for a long time. The reaction rate of each part of the layer is uniform, and the advantages of no stress concentration occur. Experiments have proved that the zinc-rich coating of the present invention does not gel after being stored at 50°C for 90 days; the thickness of one-time film formation can reach 200 μm, without cracking and peeling; the steel surface treatment grade can reach Sa2 and can be applied; the coating’s salt spray resistance can reach 10000 hours.

The invention provides a method for preparing a naphthalene series water reducer. The method comprises the following steps: sulfonation: carrying out a sulfonation reaction of naphthalene and concentrated sulfuric acid; hydrolysis: adding water into the sulfonation reaction product for hydrolysis, and hydrolyzing a by-product in the sulfonation reaction; condensation: adding poly formaldehyde and water into the hydrolysis reaction product for condensation; and neutralization: adjusting pH of the condensation reaction product to be 6-8, and drying to obtain the naphthalene series water reducer. The preparation method has the advantages of simple and stable production process and easily controlled parameters, and the prepared naphthalene series water reducer product has stable performance and good quality.

The invention provides a antistatic paint for a steel structure surface and a preparation method thereof. The paint is prepared by mixing zinc-aluminum alloy powder slurry and ethyl orthosilicate slurry in a mass ratio of 3:1-5:1. The ethyl orthosilicate in the ethyl orthosilicate slurry is subjected to hydrolytic condensation under the action of a catalyst, and a furfural-furfuryl alcohol resin is added as a modifier into the zinc-aluminum alloy powder slurry. After the zinc-aluminum alloy powder slurry and ethyl orthosilicate slurry are mixed, the furfural-furfuryl alcohol resin is cured to release water molecules when meeting with acid so as to promote the further condensation of the ethyl orthosilicate hydrolytic condensation substances, and the furfural-furfuryl alcohol resin and the zinc-aluminum alloy powder react to form a interpenetrating network, thereby enhancing the crosslinking density between the paint and the steel structure substrate surface and increasing the wettability and adhesive force of the coating for the substrate.Preferably, a carbon nanotube dispersion solution and conductive mica powder can be added into the zinc-aluminum alloy powder slurry to correspondingly improve the antistatic property of the obtained coating. Therefore, the protective paint is suitable for various steel storage tank internal and external walls, large bridges, ships, offshore oil drilling platforms and other steel structure surfaces.

The invention discloses an alloy quantum dot core with uniform internal and external components and a preparation method thereof, wherein the method comprises: stirring and mixing the pre-prepared at least two cation precursor solutions and heating them to a predetermined temperature, injecting the prepared At least one anion precursor solution of the nucleation reaction is carried out by continuing to inject the cation precursor solution or the anion precursor solution or simultaneously injecting the cation precursor solution and the anion precursor solution at a gradually changing speed during the nucleation reaction, so that the nucleation reaction During the process, the reaction rate of each component remains relatively stable and the stoichiometric ratio of nucleation is relatively consistent, thereby preparing an alloy quantum dot nucleus with uniform internal and external components. The method of the invention effectively solves the problems of inhomogeneity of the inner and outer components of the alloy quantum dot core, low luminous efficiency, unstable wavelength and fluorescence intensity, and the method provided by the invention has the advantages of simple operation, easy regulation, and high repeatability.