4results about How to "Good water reduction effect" patented technology

This invention relates to the field of concrete admixtures, specifically to an anti-mud polycarboxylate superplasticizer, its preparation method, and its application. The anti-mud polycarboxylate superplasticizer provided by this invention comprises, by weight, the following raw materials: 100-180 parts of unsaturated polyether monomer, 5-10 parts of unsaturated carboxylic acid monomer, 2-5 parts of air-entraining monomer, 5-10 parts of anti-mud monomer, 10-20 parts of oxidant, 0.4-0.6 parts of reducing agent, 5-7 parts of chain transfer agent, and 150-300 parts of water; the air-entraining monomer and the anti-mud monomer have specific structures. The simultaneous introduction of specific anti-mud monomers and air-entraining monomers into the anti-mud polycarboxylate superplasticizer of this invention not only reduces clay adsorption but also provides better dispersibility and anti-mud effect at lower dosages, increasing the overall workability of concrete and improving concrete performance.

This invention belongs to the field of building materials technology, and relates to a smart responsive concrete admixture, its preparation method, and its application. The smart responsive concrete admixture includes a main chain and at least one smart responsive side chain and at least one nano-reinforcing side chain bonded to the main chain. The main chain includes polyether structural units and unsaturated carboxylic acid structural units. The smart responsive side chain includes block copolymer temperature-sensitive structural units and calcium ion strongly chelating structural units. Composite nanoparticles are bonded to the nano-reinforcing side chains. From the inside out, the composite nanoparticles consist of a silica core, a soluble calcium source layer, and a silane coupling agent layer. The smart responsive concrete admixture provided by this invention, by introducing smart responsive side chains and nano-reinforcing side chains onto the main chain, can decouple setting time from temperature control, thereby reducing the adiabatic temperature and maximum heat release rate while ensuring early strength.

This invention discloses a method for preparing a water-retaining and retarding polycarboxylate superplasticizer, belonging to the field of concrete admixture technology. The method includes: using pentenol polyoxyethylene ether and / or methyl allyl polyoxyethylene ether, hydroxyethyl acrylate, hydrogen peroxide, vitamin C, mercaptopropionic acid, acrylic acid, and phosphorus-containing compounds as raw materials, a polycarboxylate superplasticizer is prepared via free radical polymerization; then, hydroxyl and carboxyl compounds are added sequentially for slow modification; after adjusting the system to a strongly alkaline state, refined cotton powder, chloromethane, and propylene oxide are added, and an etherification and crosslinking reaction is carried out under pressure and heating conditions; finally, the product is obtained by pressure filtration, pulverization, and drying. The polycarboxylate superplasticizer prepared by this invention possesses excellent water retention and retarding effects, effectively reducing concrete bleeding and segregation, extending setting time, improving concrete workability and durability, and exhibiting good compatibility with cement, making it suitable for high-temperature construction, large-volume concrete, and manufactured sand concrete projects.

The application discloses an early-strength heat-insulation type light plastering gypsum mortar and a preparation method thereof. The early-strength heat-insulation type light plastering gypsum mortar comprises the following raw materials in parts by weight: 550-800 parts of gypsum powder, 100-300 parts of heavy calcium, 100-300 parts of light aggregate, 50-100 parts of inorganic retarder, 1-5 parts of early-strength water reducing agent, 1-5 parts of reinforcing agent, 1-4 parts of cellulose ether, 5-15 parts of redispersible latex powder and 400-450 parts of water. The early-strength water reducing agent is prepared by reacting high-purity gypsum and polycarboxylic acid water reducing agent solution, and high-activity functional groups in the polycarboxylic acid water reducing agent are inlaid on the surface of fibrous calcium sulfate whiskers. The light aggregate is prepared from autoclaved aerated concrete. The inorganic expanding agent is used to adjust the setting time, the early-strength water reducing agent and the reinforcing agent are used to improve the compressive strength and bonding strength of the gypsum mortar, and the autoclaved aerated concrete is used to replace traditional light aggregates such as vitrified small balls and expanded vermiculite, so that the heat preservation performance of the gypsum mortar is improved.