43results about How to "Improve plastic retention" patented technology

The invention discloses a polycarboxylate water reducer modified by a silane coupling agent and a preparation method thereof. It belongs to the field of cement additives. Add a certain amount of acrylic acid to the polyether macromonomer solution, stir evenly, then add a silane coupling agent containing a double bond, the stirred solution is clear, continue to stir; continue to keep stirring, add oxidant, initiator solution and small Monomer solution; after stirring and aging for 1-2 hours, add liquid caustic soda to neutralize, stabilize the pH value at 6, and then add a silane coupling agent without double bonds to obtain a silane coupling agent-modified polycarboxylate superplasticizer finished product. The synthesis of the present invention introduces a functional group containing a siloxane structure into the main chain of the polycarboxylic acid molecule to provide an anchoring ability for the branched chain of the comb-shaped polycarboxylate superplasticizer to chemically bond and strongly interact with the gelling material particles , the increase of the anchoring capacity can significantly enhance the adaptability and slump retention of the water reducer, and expand the use of the water reducer in the field of mineral powder dispersion to a certain extent.

The invention relates to a preparation method of a naphthalene-series water reducing agent. The method comprises the following steps: (1) methylnaphthalene and phenol are separately sulfonated, such that a sulfonated methylnaphthalene material and a p-hydroxybenzenesulfonic acid material are obtained; (2) the sulfonated methylnaphthalene material is subjected to a hydrolysis reaction; un-reacted methylnaphthalene or homologs thereof are removed through zeotropy; the rest of the sulfonated methylnaphthalene material enters a reaction in the step (3); (3) the sulfonated methylnaphthalene material obtained in the step (2) and the p-hydroxybenzenesulfonic acid material obtained in the step (1) are subjected to a condensation reaction with formaldehyde acidified with concentrated sulfuric acid, such that a condensed material is obtained; and (4) alkali liquid is added into the condensed material obtained in the step (3), such that a neutralization reaction is carried out, until the pH value is 7.5-9; and the naphthalene-series water reducing agent is obtained when the reaction is finished. The naphthalene-series water reducing agent provided by the invention has the excellent performances of good adaptability to cement, good concrete workability, high plasticity-maintaining performance, low concrete gradual loss, high water reducing rate, and the like. The preparation method has the advantages of simple process and easy-to-control reaction conditions. With the method, naphthalene-series water reducing agent production cost can be reduced.

The invention relates to a method for producing multifunctional concrete from household garbage power generation waste residues, and belongs to the technical field of novel concrete materials and environmental engineering. The method comprises the following steps: mixing the household garbage power generation waste residues with natural sand to obtain mixed sand; mixing the household garbage power-generation waste residues with the grain sizes greater than 5 mm with crushed stones to obtain mixed crushed stones; mixing natural zeolite powder with brucite fibers to prepare a thickening early-strengthening anti-cracking self-curing agent; mixing a polycarboxylate superplasticizer with ultrafine mineral powder to obtain a liquid water-reducing plasticity-maintaining agent; weighing cement, coal ash, silicon powder, mineral powder, the thickening early-strengthening anti-cracking self-curing agent and the mixed crushed stones in a mass ratio, and pouring into a stirrer successively for uniformly stirring to obtain the multifunctional concrete. The concrete prepared by the method has characteristics of self-compaction, self-curing, low hydration heat, low shrinkage, high durability and high plasticity retention property and can be applied to architectural engineering, civil engineering, traffic engineering, city construction engineering and the like. The method has very high economic and social benefits.

The invention discloses an anti-impact and wear-resistant mortar, belonging to the field of a repairing material in water-power engineering. The difficulty that the constructions in the conventional water-power engineering is difficult to repair after being damaged by rushing and abrading with water with sands and stones can be solved. The anti-impact and wear-resistant mortar comprises the following components in parts by weight: 39-48 parts of silicate cement, 45-50 parts of graded hard fine aggregate, 0.05-0.25 parts of water reducing agent, 0.05-0.3 parts of de-foaming agent and 0.05-1.5 parts of nanometer material. The anti-impact and wear-resistant mortar provided by the invention has the advantages of high anti-impact and wear-resistant strength, low elasticity modulus and good anti-crack property, and is a finished product material with a higher application value for repairing through irrigation works.