Slow-release concrete water-retaining agent and preparation method thereof

A slow-release concrete technology, applied in the preparation of the slow-release concrete water-retaining agent, in the field of slow-release concrete water-retaining agent, can solve problems such as simple preparation process, achieve good cohesion, avoid phase separation, increase Effects of large hydraulic volumes

Inactive Publication Date: 2020-06-16
刘翠芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above technologies are especially effective for how to make the concrete water-retaining agent have slow-release properties, and it is especially effective for concrete bleeding and fluidity in the later stage. It can continuously improve the cohesion performance of concrete, has good flow rate performance, and the preparation process is simple. No specific instructions are given. mentoring program

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  • Slow-release concrete water-retaining agent and preparation method thereof
  • Slow-release concrete water-retaining agent and preparation method thereof

Examples

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Embodiment 1

[0018] Embodiment 1: The slow-release concrete water-retaining agent of the present invention is made of the following components and raw materials in parts by weight: 31 parts of acrylamide monomers, slow-release monomers, namely hydroxyethyl methacrylate 16.2 parts of ester, 0.2 part of azobisisobutyronitrile as initiator, and 3100 parts of deionized water. The acrylamide monomer is a combination of 30 parts of acrylamide and 1 part of 2-acrylamide-2-methylpropanesulfonic acid. The preparation method of the slow-release concrete water-retaining agent includes the following process steps: ① Dissolve the acrylamide monomer and the slow-release monomer in 220 parts of deionized water according to the above-mentioned parts by mass, and pour the solution into a three-necked flask In the process, start stirring, heat up to 65°C, then add an initiator in a three-necked flask, (at 65°C) heat preservation reaction for 10 hours, add deionized water to dilute, and obtain a colorless an...

Embodiment 2

[0019] Embodiment 2: The slow-release concrete water-retaining agent of the present invention is made of the following components and raw materials in parts by weight: 31 parts of acrylamide monomers, slow-release monomers, namely hydroxypropyl methacrylate 20 parts of ester, 0.18 parts of azobisisobutylimidazoline hydrochloride as initiator, and 3400 parts of deionized water. The acrylamide monomer is a combination of 30 parts of acrylamide and 1 part of 2-acrylamide-2-methylpropanesulfonic acid. The preparation method of the slow-release concrete water-retaining agent includes the following process steps: ① Dissolve the acrylamide monomer and the slow-release monomer in 250 parts of deionized water according to the above-mentioned parts by mass, and pour the solution into a three-necked flask In the process, start stirring, heat up to 55°C, then add an initiator in a three-necked flask, (at 55°C) heat preservation reaction for 12 hours, add deionized water to dilute, and obt...

Embodiment 3

[0020] Example 3: The slow-release concrete water-retaining agent of the present invention is made from the following components and parts by weight of raw materials: 31 parts of acrylamide monomers, 17.2 parts of hydroxypropyl acrylate as slow-release monomers parts, the initiator is 0.21 parts of azobisisobutylamidine hydrochloride, and 3300 parts of deionized water. The acrylamide monomer is a combination of 30 parts of acrylamide and 1 part of 2-acrylamide-2-methylpropanesulfonic acid. The preparation method of the slow-release concrete water-retaining agent comprises the following process steps: ① Dissolve the acrylamide monomer and the slow-release monomer in 200 parts of deionized water according to the above-mentioned parts by mass, and pour the solution into a three-necked flask In the process, start stirring, heat up to 60°C, then add an initiator in a three-necked flask, (at 60°C) heat preservation reaction for 11 hours, add deionized water to dilute, and obtain a c...

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Abstract

The invention discloses a slow-release concrete water-retaining agent and a preparation method thereof. The water-retaining agent is prepared from the following raw materials: 30-35 parts of an acrylamide monomer, 15-20 parts of a slow-release monomer, 0.18-0.21 part of an initiator and 3000-3800 parts of deionized water. The acrylamide monomer is one or two of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid; the slow-release monomer is one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; and the initiator is one of azodiisobutyronitrile, azodiisobutylamidine hydrochloride and azodiisobutylimidazoline hydrochloride. The invention also provides the preparation method of the water-retaining agent. The water-retaining agenthas slow release property, is especially effective for concrete bleeding and large fluidity later stage, can continuously improve the cohesiveness of concrete, has good flow velocity performance, is simple in preparation process, and can be used in constructional engineering of high-standard concrete, concrete in severe cold regions and ultrahigh pumping concrete.

Description

technical field [0001] The invention relates to a concrete water-retaining agent, in particular to a slow-release concrete water-retaining agent. The invention also relates to a preparation method of the slow-release concrete water-retaining agent. Background technique [0002] Concrete with good workability is conducive to concrete construction, to the increase of mechanical properties, and to hardening to increase the aesthetics of concrete. However, in concrete mixing, the phenomenon that the slurry sinks, the coarse aggregate is exposed, and the edge oozes yellow slurry often occurs, that is, the phenomenon of concrete bleeding. Bleeding in concrete mixing can be improved by adding common water retaining agents, such as cellulose, wenlun glue, etc. However, the bleeding caused by the increase of concrete fluidity with time, that is, the delayed bleeding of concrete, is difficult to solve by using the above water retaining agents. [0003] At present, the concrete wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/20C04B24/26C04B103/46
CPCC04B24/2688C04B2103/465C08F220/56
Inventor 倪涛汪咏梅宋欣王龙刘昭洋王龙飞田献文王进春康静刘翠芬
Owner 刘翠芬
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