33results about How to "Strong retardation" patented technology

A door made of polyurethane, including a door body, the door body including a plurality of integrated plates stacked on one another for supporting. A method for preparing the door includes providing a mold, and spraying a parting agent inside the mold; heating the mold to a temperature of 30-70° C., spraying the parting agent, and placing a plurality of plates or a metal skeleton in the mold; mixing raw materials to obtain a mixture; injecting the mixture into the mold to cover the stacked plates, and curing for 30-90 min; demolding, transferring a product from the mold to a thermostatic chamber for shaping at a constant temperature; trimming uneven edges and surfaces of the product; and spraying a paint on the product.

The invention belongs to the technical fields of chemical industry and concrete construction materials. In order to solve the problems of high slump constant time loss and lower flowability in the concrete, the invention provides a preparation method of starch sulfonate. The preparation method comprises the following steps: dissolving dextrin prepared from starch or directly purchased dextrin in water, heating to react by using water as a dispersing agent and sodium bisulfite as a sulfonating agent, and regulating the pH value to 7 with sodium hydroxide to obtain a liquid which is the starch sulfonate. The invention uses the method for preparing starch sulfonate by using water as the medium and sodium bisulfite as the sulfonating agent for the first time, which is different from the preparation method by using dichloromethane or any other organic solvent as the medium in the prior art. The method has the advantages of simple technique, environment friendliness and no pollution emission, and is beneficial to industrial production. The product has favorable synergic dispersion properties for cement particles, solves the problems of poor slump retaining effect and poor workability in the existing retarder for concrete, use of toxic solvents in the preparation process, and difficulty in treating sulfonating agent byproduct chlorine ions. The invention provides a novel preparation method of starch sulfonate.

The invention relates to high-temperature-resistant and large-temperature-difference-resistant cement grout for well cementation in an oil field. The cement grout is prepared from components of raw materials in parts by weight as follows: 600 parts of G-grade oil well cement, 30-36 parts of an HS101L fluid loss agent, 8-20 parts of an HS201L retarder, 1.8 parts of an HS-301S dispersant, 150 parts of quartz sand, 30 parts of silica fume, 1.8 parts of an HS-XF1S suspension stabilizer, 280-300 parts of water and 1 part of bis(2-ethylhexyl) sulfosuccinate sodium salt, wherein the grain size of the quartz sand is 80-120 meshes, the grain size of the silica fume is 300-400 meshes, and the content of silicon dioxide is 90% or higher. Liquid-phase raw materials are added to a grout mixing container and mixed uniformly; solid-phase substances are added to a solid-phase container and stirred uniformly, the solid-phase mixture is added to the grout mixing container, finally, a defoaming agent is added, and the mixture is stirred uniformly. The cement grout can be used under the condition of 50-180 DEG C, has prominent large-temperature-difference-resistant performance and can effectively avoid a super-retarding phenomenon caused by large temperature difference.

The invention belongs to the technical field of building materials, in particular to a concrete retarder and a preparation method thereof. The concrete retarder is made of the following raw materials: 3-6 parts of modified microcrystalline cellulose, 1-3 parts of acrylic acid, 8-12 parts of modified glass fiber, 5-10 parts of borax, 6-10 parts of poly Vinyl chloride resin, 2-4 parts of anhydrous sodium sulfate, 3-5 parts of quartz sand, 8-12 parts of sodium tripolyphosphate, 1-3 parts of carboxymethyl cellulose. The concrete retarder provided by the invention has good heat absorption and heat dissipation properties, can absorb the heat of hydration generated by concrete; and make the concrete form a good heat exchange effect with the external environment, so that the heat of hydration generated in the concrete can be dissipated ; And inhibit the hydration of cement in concrete, has a strong retarding effect; at the same time has good strength, less impact on the strength and anti-scouring performance of concrete.

The invention discloses a composite cement admixture, which belongs to the technical field of cement process admixtures. The grinding aid of the present invention is composed of 20-30 parts of composite alcohol amine components, 10-15 parts of isooctanyl phosphate, 4-8 parts of molasses, 4-8 parts of emulsifying dispersant, 5-10 parts of triethylene glycol, It is prepared from 3-5 parts of accelerator and 50-70 parts of water as raw materials. The synergistic effect of the isooctyl phosphate ester and the compound alcohol amine component of the present invention makes the grinding aid dosage small, and the grinding aid effect is good, and the 3d and 28d compressive and flexural strength of cement can be significantly improved at the dosage of 0.01%. , and the raw materials are easy to obtain, the preparation method is simple, and it is suitable for popularization and use.

The invention discloses macroporous concrete containing low grade recycled aggregates. The macroporous concrete containing low grade recycled aggregates is prepared from the following raw materials: cement, water, low grade recycled aggregates, modified starch and a sugar retarder, wherein the grain size of the low grade recycled aggregates is 5-16mm, and the bulk density is 700-900kg / m<3>. The macroporous concrete containing low grade recycled aggregates is further prepared from additional water, the use level of which is calculated according to the follow formula: delta W=mgr*wgr, wherein delta W is the use level of the additional water of the macroporous concrete containing low grade recycled aggregates; mgr is the use level of the low grade recycled aggregates and wgr is 1h water absorption of the low grade recycled aggregates. According to the invention, the grade recycled aggregates are applied to preparation of the macroporous concrete, so that the mixture state satisfies the using demand under the condition that an additive in an extra amount is not added by virtue of adjusting the raw materials and matching with the sugar retarder and modified starch.

The invention discloses a phosphorus slag based environmentally-friendly building material and a preparation method thereof. The phosphorus slag based environmentally-friendly building material comprises the following components in parts by mass: 14.61 to 44.08 parts of phosphorus slag powder, 1.11 to 18.72 parts of building waste residue powder, 1.11 to 6.24 parts of sialic sphere powder, 1.11 to3.12 parts of nanometer silex, 2.10 to 8.46 parts of an alkaline activator, 20.81 to 66.51 parts of sand, 11.08 to 16.53 parts of water and 0.22 to 1.17 parts of an efficient polycarboxylate superplasticizer. The phosphorus slag based environmentally-friendly building material is low in cost, simple in preparation technology and short in maintenance time.

The invention discloses a novel rapid repair material for magnesium phosphate cement and a preparation method thereof. The composite material is mainly made of the following raw materials in parts by weight: 25 parts of magnesium oxide, 15-20 parts of potassium dihydrogen phosphate, Diamine tetraacetic acid dipotassium salt dihydrate 0.5-1.5 parts, water 5-10 parts. The invention uses dipotassium ethylenediaminetetraacetic acid dihydrate as a setting retarder, replacing the borax used in traditional magnesium phosphate cement. The invention has excellent retarding effect. On the one hand, the setting time of the magnesium phosphate repair system is greatly prolonged; on the other hand, the system can not only ensure the early strength of the magnesium phosphate cement sample, but also improve its later strength to a certain extent.

The invention discloses a method for preparing a food browning inhibitor from cedar pine needles. The method is characterized by comprising the following steps: smashing dried cedar pine needles, adding normal hexane according to the material-to-liquid ratio of 1g: (10-20mL), vibrating at room temperature for 12-24h and filtering to separate a normal hexane extracting liquid; recovering the degreased pine needles, adding 50-70wt% methanol as an extracting agent according to the material-to-liquid ratio of 1g: (10-30mL), vibrating at room temperature for 24-48h, separating a supernatant, concentrating and drying the supernatant to obtain a methanol extract with the yield of 15-22%; suspending the methanol extract into 20-30mL of 50wt% methanol, carrying out chromatography by using a macroporous adsorption resin DiaionHP-20 chromatographic column, carrying out gradient elution at the flow speed of 3-5mL / min by using water and methanol with the concentrations being respectively 0wt%, 15wt%, 30wt%, 40wt%, 60wt% and 100wt%, collecting the 40wt% methanol eluant, concentrating and drying to obtain the food browning inhibitor, separating and purifying by using a high performance liquid chromatography; and obtaining the effective component, i.e., 2R, 3R-dihydromyricetin of the food browning inhibitor.

The invention discloses a grouting compound and a performance parameter detection method thereof. The grouting compound comprises the following components in parts by weight: 500-1500 parts of cement,500-3000 parts of aggregate, 10-150 parts of an admixture, 5-150 parts of rubber powder, 1-20 parts of a high-efficiency water-reducing agent, 1-10 parts of an anti-cracking capsule, 0.1-5 parts of adefoaming agent, 0.02-2 parts of a plastic expanding agent, 20-150 parts of a hardening expanding agent, 0.5-10 parts of an early strength agent, 0.5-5 parts of a slump retaining agent and 0.5-5 parts of fiber, wherein mixing water is 0.10-0.35 times of powder. Through a matching ratio, the grouting compound has very high early strength and superstrong coagulation retardation, has 90min fluiditybeing better than the discharge flow performance of the conventional grouting material, and can fully densify and infiltrate a concrete interface; in addition, because of good bonding performance, a circumferential construction joint constructed on a previous slab and an open end of the previous slab are repaired better to obtain overall bonding strength, so that mechanical properties of a liningare greatly improved; the defects that when the conventional grouting material is used for repairing, an original base surface is required to be chiseled and be brushed with an interface agent are overcome, and a concrete structure can be directly repaired.

The invention belongs to the technical field of oil and gas well development, and discloses a temperature self-adaptive high-temperature retarder suitable for oil and gas well cementing, a preparation method thereof and well cementing cement slurry. This high-temperature retarder contains structural unit A shown in (I), structural unit B shown in (II), structural unit C shown in (III) and structural unit D shown in formula (IV); wherein, structural unit A, The structure percentages of B, C and D p=7.18‑10.76%, q=40.22‑64.66%, m=25.86‑46.25%, n=1.05‑3.8%; this high temperature retarder can avoid the deterioration of the stability of cement slurry At the same time, the early strength of the cement slurry is high at low temperature, which can avoid the problem of slow or even super retarded cement strength formation in the upper part of the long sealing section;