A method for preparing concrete reinforcing agent with hyperbranched polymer

A technology of hyperbranched polymer and structural polymer, which is applied in the field of concrete admixtures, can solve the problems of insufficient early strength effect, reduced later strength, and decreased durability, and achieves good early strength effect, improved early strength, and ease of shielding. effect of effect

Active Publication Date: 2020-08-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the disadvantages of lack of early-strength effect of current early-strength agents, and easy to cause later-stage strength reduction and durability decline, the purpose of the present invention is to provide a nano Method for Micronized Calcium Silicate Hydrate / Hyperbranched Polymer Composite Particle Suspension

Method used

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  • A method for preparing concrete reinforcing agent with hyperbranched polymer

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[0027] (1) Preparation of polymer

[0028] A method for synthesizing a star-shaped polycarboxylate high-performance water reducer is characterized in that the conditions and steps for synthesizing a star-shaped structure polycarboxylate high-performance water reducer are as follows:

[0029] (1) Synthesis of active core: firstly, add polyol into the reactor, heat up to 40-80°C, add polymerization inhibitor, (meth)acrylic acid, and catalyst to the reactor in turn, and stir for 5 -20 minutes, when the temperature rises to 80-100°C, add water-carrying agent, continue to heat up to 100-150°C for esterification reaction, and separate the water obtained from the reaction at the same time, react by vacuuming after 2-10 hours Remove the water-carrying agent to obtain an esterification reaction product;

[0030] (2) Synthesis of esterified macromonomers: firstly, polyethylene glycol compounds are added to the reactor, and the temperature is raised to 50-70°C. agent, (meth)acrylic aci...

Embodiment 1

[0041] In a four-necked flask of 1000ml, the prepared 10g polymer P3 was dissolved in 235g ultrapure water, and the pH was adjusted at 11.50 with sodium hydroxide, and continued stirring in the four-necked flask (water-bath temperature 60° C.) 500r / min). Dissolve 33.34g of calcium nitrate tetrahydrate in 21.4g of ultrapure water, 23.62g of sodium silicate nonahydrate into 20g of ultrapure water, and add them dropwise for 6 hours.

Embodiment 2

[0043] In a four-necked flask of 1000ml, the prepared 15g polymer P2 was dissolved in 185g ultrapure water, and the pH was adjusted at 11.32 with sodium hydroxide, and continued stirring in the four-necked flask (water-bath temperature 40° C.) 1000r / min). Dissolve 32.05g of calcium nitrate tetrahydrate in 31.4g of ultrapure water, 25.72g of sodium silicate nonahydrate in 30g of ultrapure water, and add them dropwise for 9 hours.

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Abstract

The invention discloses a method for preparing a concrete reinforcing agent from a hyperbranched polymer and belongs to the field of concrete admixtures. The reinforcing agent (suspension) is a hydrated calcium silicate (C-S-H) / hyperbranched structure polymer composite nano-micron particle suspension of which the diameter is within a range of 1nm to 1,000nm, and is prepared from a soluble calcium salt, soluble silicate and a water-soluble hyperbranched structure polymer as the raw materials. The main component of the suspension is composite nano-micron particles of hydrated calcium silicate (C-S-H) and a polymer. An empirical formula of an inorganic component in the composite nano-micron particles is aCaO.SiO2.bH2O.cX, wherein a is smaller than 3.0 and greater than 0.5, b is smaller than 6 and greater than 1 and c is smaller than 1 and greater than 0 and X is an alkali metal or alkaline-earth metal. The cement hydration rate can be obviously increased, the strength in every age of a cement-based material, especially the early age strength is improved, and the concrete reinforcing agent is low in mixing amount, has a certain water reducing effect, is free of pollution to the environment, and is nontoxic and harmless. The concrete reinforcing agent has the advantages that the form cycling rate is increased, the construction efficiency is improved, the energy consumption is reduced and the cost is reduced as an early strength component.

Description

technical field [0001] The invention belongs to the field of admixtures for concrete in building materials, and relates to a method for preparing a nano-micron hydrated calcium silicate cement-based material reinforcing agent with a water-soluble hyperbranched structure polymer. Background technique [0002] Concrete early strength agent refers to the admixture that can improve the early strength of concrete, and it is mostly used in winter construction or emergency repair or prefabricated components. [0003] At present, the more common concrete accelerators in my country mainly include chloride salts, sulfates, carbonates, organics and organic-inorganic composite accelerators. [0004] Although they can solve the problem of early strength to a certain extent, many defects have been exposed in the process of use, such as chloride salts are easy to corrode steel bars, potassium and sodium salts are easy to cause alkali-aggregate reactions and affect durability, and the amoun...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B24/24
CPCC04B40/0039C04B2103/12C04B22/00C04B24/24
Inventor王子明申和庆刘晓薛龙庞晓凡
OwnerBEIJING UNIV OF TECH