33results about How to "Strong retardation" patented technology

The invention provides a protein gypsum retarder and a preparation method thereof, and the preparation method comprises the following steps: pretreatment of a protein component: dissolving an alkali substance and water to form an alkali solution, heating, adding the protein component into the alkali solution, stirring, and cooling to room temperature to obtain a protein liquid; preparing a mixed solution, namely adding an acid substance into the protein solution, stirring until the acid substance is completely dissolved, and cooling to room temperature to obtain the mixed solution; and preparing the powder retarder: adding the anti-blocking agent into a reaction kettle, stirring and heating at the same time, uniformly spraying the prepared mixed solution into the kettle through an atomizer, continuously stirring, taking out the material, and sieving with a 100-mesh sieve to obtain the powder retarder. The protein gypsum retarder disclosed by the invention is strong in retarding effect, small in side effect on the strength of gypsum, relatively simple in raw material components and preparation process, and free from generation of harmful substances in the whole preparation process.

The invention discloses a retarder for a high-temperature-resistant cement paste system. The retarder comprises the following components: monomers consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic acid and itaconic acid in a mass ratio of (18-24): (9-21): (6-12): (6-12); an initiator accounting for 6%-8% of the total mass of the monomers; and monomer borax accounting for 3%-5% of the total mass of the monomers. A polymer formed by the above components is a quadripolymer which solves the problem of rapid hydration of cement paste at a high temperature; and the quadripolymer synthesized by using a simple synthetic process has better retarding effect compared with the same mass of a terpolymer or bipolymer.

The invention belongs to the technical field of building materials, and particularly relates to a concrete retarder and a preparation method thereof. The concrete retarder is prepared from 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 polyvinyl chloride resin, 2-4 parts of anhydrous sodium sulfate, 3-5 parts of quartz sand, 8-12 parts of sodium tripolyphosphate and 1-3 parts of carboxymethyl cellulose. The concrete retarder has good heat absorption property and heat dissipation property, and can absorb hydration heat produced by concrete; a good heat exchange effect is formed between the concrete and the external environment so that hydration heat energy generated in the concrete is dissipated; hydration of cement in the concrete is inhibited, and a strong retarding effect is achieved; meanwhile, the concrete retarder has good strength, and the influence onthe strength and the anti-scouring performance of the concrete is low.

The invention discloses a composite cement admixture, and belongs to the technical field of cement process admixtures. The grinding aid is prepared from the following raw materials in parts by weight:20-30 parts of a compound alcohol amine component, 10-15 parts of isooctyl alcohol phosphate, 4-8 parts of molasses, 4-8 parts of an emulsifying dispersant, 5-10 parts of triethylene glycol, 3-5 parts of an accelerant and 50-70 parts of water. The isooctanol phosphate and the composite alkylol amine component are in synergistic interaction, so that the grinding aid is small in mixing amount and good in grinding aid effect, and the 3d and 28d compressive and flexural strength of cement can be remarkably improved under the mixing amount of 0.01%; in addition, the raw materials are easy to obtain, and the preparation method is simple and suitable for popularization and application.

The invention discloses a quick repairing material for magnesium phosphate cement and a preparation method thereof. The quick repairing material for magnesium phosphate cement, as a composite, is mainly made from, by weight, 25 parts of magnesium oxide, 15-20 parts of monopotassium phosphate, 0.5-1.5 parts of ethylenediamine tetraacetic acid dipotassium salt dihydrate, and 5-10 parts of water. Theethylenediamine tetraacetic acid dipotassium salt dihydrate is used herein as a retardant to replace borax used in the traditional magnesium phosphate cement. The quick repairing material has good retarding effect; setting time of the magnesium phosphate repairing system is greatly extended; the magnesium phosphate repairing system ensures early strength of a magnesium phosphate cement sample, and late strength of the magnesium phosphate repairing system is improved to certain extent.

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 relates to a preparation method of starch sulfate and application of the starch sulfate as a cement additive. The invention relates to the technical field of fine chemical engineering and concrete admixtures. For the first time, the starch sulfate is prepared by taking sodium hydrogen sulfate or sulfuric acid or a composition aqueous solution of sodium hydrogen sulfate and sulfuric acid as a sulfonating agent by a semi-dry method, and synthesis raw materials comprise starch, the sulfonating agent and an inorganic alkali. The synthesis process comprises the following steps: preparing the sulfonating agent; mixing the sulfonating agent with the starch; heating and esterifying the mixture; and performing esterification product base neutralization. The method disclosed by the invention is different from a method for preparing the starch sulfate by taking concentrated sulfuric acid, chlorosulfonic acid, sulfur trioxide and the like as sulfonating agents in the prior art; the method has the advantages of simple preparation process, no emission of three wastes, low raw material cost, low equipment requirements and the like. The product prepared by the invention can be directly used as a super-retarding superplasticizer or retarder, and has the advantages of high water reducing rate, good retarding effect, strong cohesiveness, bleeding resistance, segregation resistance and the like; and if the starch sulfate is compounded with polycarboxylate superplasticizers and the like, an obvious synergistic effect can be generated.

The invention discloses a concrete curing agent and a preparation process thereof. The concrete curing agent is prepared from the following raw materials in parts by weight: 40-60 parts of lithium silicate, 10-20 parts of a silane coupling agent, 6-12 parts of nano titanium dioxide, 10-30 parts of a modified water reducing agent, 10-20 parts of an expanding agent and 50-80 parts of water. According to the concrete curing agent and the preparation process thereof, a modified naphthalene water reducer and an oxidized etherified starch water reducer are introduced into a stirrer to be mixed and stirred uniformly to obtain a composite naphthalene water reducer, the modified naphthalene water reducer contains a large number of hydroxyl groups (-OH) and carboxyl groups (-COOH), the hydroxyl groups (-OH) and calcium ions on the surfaces of cement particles are adsorbed to form a film, hydroxyl groups can form hydrogen bonds with the surface of cement to prevent hydration, a retarding effect on cement hydration is achieved, and an oxidized etherified starch water reducing agent and a naphthalene water reducing agent are compounded, so that the purposes of increasing the water reducing rate, improving the slump retaining property and improving the later strength of concrete are achieved.

The invention discloses sulfate-corrosion-resistant waterproof mortar and a preparation method thereof. Comprising the following raw materials in parts by weight: 250-350 parts of nickel slag, 20-30 parts of carbide slag, 25-35 parts of sodium carbonate, 4-6 parts of basalt fiber, 5-7 parts of sodium lignin sulfonate, 40-50 parts of polyvinyl alcohol stabilized ethylene-vinyl acetate emulsion, 750-1050 parts of ferronickel tailings, 35-45 parts of water, 4-6 parts of an auxiliary agent, 1-6 parts of a water reducing agent and 1-2 parts of a defoaming agent. According to the sulfate-erosion-resistant waterproof mortar prepared by adopting a wet-grinding ultrafine mode and the preparation method, sulfate erosion of concrete can be effectively prevented, the mortar has excellent self-repairability and impermeability, coordination of body deformation is guaranteed, the materials are low in cost, easy to obtain and environmentally friendly, the operation process is simple and convenient, the preparation cost is effectively reduced, and the method is suitable for industrial production. And the method has obvious practicability and economical efficiency.