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Multi-branch polycarboxylic acid water reducing agent with slump-retaining performance and preparation method thereof

A branched-chain polycarboxylic acid and water-reducing agent technology, applied in the field of multi-branched-chain polycarboxylic acid water-reducing agent and its preparation, can solve problems such as fluidity loss, and achieve improved slump retention performance, good slump retention effect, and good slump retention. The effect of slump retention

Active Publication Date: 2013-11-13
SHANGHAI RES INST OF BUILDING SCI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Occurred fluid loss faster in use, in order to solve this kind of problem, this is the purpose of the present invention

Method used

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  • Multi-branch polycarboxylic acid water reducing agent with slump-retaining performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Monomer A 5g (acrylic acid)

[0031] Monomer B 80g (prenol polyoxyethylene ether, EO is 50)

[0032] Monomer C 6.0g (methyl acrylate)

[0033] Monomer D 0.5g (methacryloxyethyltrimethylammonium chloride (DMC)

[0034] Put 80g of monomer b into a four-neck flask, blow with nitrogen three times, and heat to 65°C with an oil bath. Add dropwise monomers a, c, d and chain transfer agent mercaptopropionic acid 0.33g and deionized water 68g aqueous solution 1, 0.8g ammonium persulfate and 68g deionized water initiator aqueous solution. The two liquids were added dropwise at the same time, the time for dropping was 3 hours, the holding time was 2 hours, and the temperature was lowered to 30°C. An aqueous polycarboxylic acid solution having a content of 40% was obtained. Recorded as water reducing agent PC-2.

Embodiment 2

[0036] Monomer A 5g (methacrylic acid)

[0037] Monomer B 75g (methacryl alcohol polyoxyethylene ether, EO is 50)

[0038] Monomer C 5.4g (ethyl acrylate)

[0039] Monomer D 0.7g methacryloxyethyltrimethylammonium chloride (DMC)

[0040] Put 80g of monomer b into a four-neck flask, blow with nitrogen three times, and heat to 65°C with an oil bath. Add monomer a, c, d and chain transfer agent mercaptoacetic acid 0.35g and deionized water 68g aqueous solution 1, 0.7g ammonium persulfate and 68g deionized water initiator aqueous solution respectively. The two liquids were added dropwise at the same time, the time for dropping was 3 hours, the holding time was 2 hours, and the temperature was lowered to 30°C. An aqueous polycarboxylic acid solution having a content of 40% was obtained. Recorded as water reducing agent PC-2.

Embodiment 3

[0042] Monomer A 5g (acrylic acid)

[0043] Monomer B 80g (prenol polyoxyethylene ether, EO is 50)

[0044] Monomer C 6.5g (hydroxypropyl acrylate)

[0045] Monomer D 0.5g (acryloyloxyethyltrimethylammonium chloride (DAC))

[0046] Put 80g of monomer b into a four-neck flask, blow with nitrogen three times, and heat to 65°C with an oil bath. Add dropwise monomers a, c, d and chain transfer agent mercaptopropionic acid 0.33g and deionized water 68g aqueous solution 1, 0.8g ammonium persulfate and 68g deionized water initiator aqueous solution. The two liquids were added dropwise at the same time, the time for dropping was 3 hours, the holding time was 2 hours, and the temperature was lowered to 30°C. An aqueous polycarboxylic acid solution having a content of 40% was obtained. Recorded as water reducing agent PC-3.

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Abstract

The invention discloses a multi-branch polycarboxylic acid water reducing agent with slump-retaining performance. The polycarboxylic acid water reducing agent is formed by aqueous solution polymerization under the effect of a polymerization initiator. A monomer A accounts for 3-10% of total reactant weight. A monomer B accounts for 80-90% of the total reactant weight. A monomer C accounts for 3-6% of the total reactant weight. A monomer D accounts for 0.5-2% of the total reactant weight. Deionized water accounting for 100-200% of the total weight of the four monomer reactants is further added. By means of the technical scheme, the multi-branch polycarboxylic acid water reducing agent has a good slump-retaining effect and can improve the slump-retaining performance of other products by mixing with other categories of polycarboxylic acid water reducing agent. The multi-branch polycarboxylic acid water reducing agent has the advantages that a molecular structure is novel, a main chain has negative ions and positive ions, branches have non-ionic structure characteristics, the multi-branch polycarboxylic acid water reducing agent has a good slump-retaining effect on common sand materials especially sand materials containing mud, and if the multi-branch polycarboxylic acid water reducing agent is used alone, mixing amount is 0.10-0.22%; and in the molecular structure, coagulation delaying components do not exist, and normal coagulation time of concrete is not affected in different seasons.

Description

technical field [0001] The invention relates to a fluidity retaining agent for cement slurry, mortar, concrete, etc., in particular to a multi-branched polycarboxylate water reducer with slump retention performance and a preparation method thereof. Background technique [0002] Cement slurry, mortar and concrete materials are the most used modern building materials. They are widely used in various projects such as urban construction, infrastructure construction, industrial and civil construction, water conservancy engineering, military engineering, and transportation engineering in the country's economic construction. . One of the characteristics of concrete materials is the compressive strength as the main design index. According to the law of concrete strength, the decisive factor that determines the compressive strength of cement-based building materials is the water-cement ratio. The smaller the water-cement ratio required for high-strength cement materials, that is, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F290/06C08F220/06C08F222/02C08F220/34C08F2/38
Inventor 卞荣兵朱玲丁志明汪良周南南
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD