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Polyacrylic acid salts shrinkage-reducing-agent and method for making same

A technology of polyacrylate and polyacrylic acid, which is applied in the field of concrete structure and concrete engineering, can solve the problems of easy volatilization and reduce the strength of concrete, and achieve the effects of low cost, convenient operation and good shrinkage reduction effect

Inactive Publication Date: 2007-02-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are compounds with small molecular weight and are volatile. According to the data, these compounds will reduce the strength of concrete.

Method used

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  • Polyacrylic acid salts shrinkage-reducing-agent and method for making same
  • Polyacrylic acid salts shrinkage-reducing-agent and method for making same

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Experimental program
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Embodiment Construction

[0024] The present invention will be further explained below in conjunction with specific embodiments.

[0025] A polyacrylate shrinkage reducing agent is composed of acrylic acid, styrene, azobisisobutyronitrile initiator, dodecyl mercaptan chain transfer agent, polyethylene glycol and phosphoric acid catalyst, acrylic acid: styrene: azobis The molar ratio of isobutyronitrile: dodecyl mercaptan: polyethylene glycol: phosphoric acid is 1:0.1:0.003:0.5:1.15:0.1. The molecular weight of its polyethylene glycol is 400. The process steps of its synthesis are as follows:

[0026] 1. Preparation of monomer mixture

[0027] First, 1 mol of acrylic acid, 0.1 mol of styrene and 0.003 mol of azobisisobutyronitrile initiator are mixed and stirred uniformly to prepare a monomer mixture.

[0028] 2. Conduct aggregated response

[0029] Within 4 hours, add the monomer mixture prepared in step 1 with stirring to the 3mol ethyl acetate organic solution at a temperature of 70℃. After the addition ...

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Abstract

An acrylate condensing agent and its preparation relates to additive of concrete. The invention comprises acroleic acid or methacrylic acid, phenylethene, initiating agent, chain-transferring agent, carbowax and catalyst and can get a linear polymer of high molecular weightcontaining polyoxyalkylenes chain. The invention has the advantages of low addition, low volatility, low reduction. The invention can be used in Portland cement concrete generally and is an ideal concrete condensing agent.

Description

Technical field: [0001] The invention belongs to the technical field of concrete structures and concrete engineering, and particularly relates to an admixture for concrete. Background technique: [0002] Because concrete is easy to be formed into components of various sizes and shapes, and has the characteristics of high strength and good durability, and its raw materials such as cement, aggregates and water are cheap and easy to obtain, concrete is the world’s The most versatile building material. But the biggest disadvantage of concrete is its high brittleness and low tensile strength. It is easy to shrink and cracks or cracks appear under dry conditions. These cracks or cracks reduce the strength and durability of concrete, shorten the service life of concrete, and even affect concrete The structure is safe. Therefore, solving the problem of concrete cracking caused by drying shrinkage has always been a topic of concern in the field of construction and civil engineering. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F2/38C04B24/26
Inventor 钱觉时王智蒋长清唐祖全
Owner CHONGQING UNIV