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A kind of preparation method of low air-entraining solid polycarboxylate water reducer

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of low air-entraining solid polycarboxylate water reducer and water reducer, which can solve the problems of high air content in concrete and achieve unaffected performance, Effect of reduced production cost, good flowability and holding capacity

Active Publication Date: 2017-09-15
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems existing in the prior art, the present invention adjusts the composition of the polyether monomer in the polycarboxylate water reducer and introduces other hydrophobic groups through the introduction of silicon-containing polyacrylate to adjust the surface of the water reducer. Tension, so that the water reducer molecules have the effect of eliminating foam control, and then solve the problem of large air content in the concrete; through the vacuum dehydration of the solid polycarboxylate water reducer, the method of condensing and slicing is directly prepared to solve the polycarboxylate water reducer Problems of storage and transportation and application in dry powder mortar

Method used

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  • A kind of preparation method of low air-entraining solid polycarboxylate water reducer
  • A kind of preparation method of low air-entraining solid polycarboxylate water reducer
  • A kind of preparation method of low air-entraining solid polycarboxylate water reducer

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Effect test

Embodiment 1

[0030] Step 1. Preparation of silicon-containing polyacrylate: Add 205 parts of acrylic acid and 210 parts of methyl acrylate, 40 parts of hydroxyethyl acrylate, 45 parts of Ethyl silicone oil, 4 parts of Span 60, 2.5 parts of Tween 80, 0.9 parts of ammonium persulfate and 280 parts of water, heated and stirred and emulsified at 45°C to 50°C for 1 hour; add the remaining 2.6 parts of ammonium persulfate to 50 Parts are pre-formulated as initiator solution; transfer the pre-emulsion to the container, add 170 parts of water to the reaction kettle, heat up to 65 ° C ~ 70 ° C and stir at a constant speed; drop the pre-emulsion and initiator solution at the same time through a constant flow pump , drop it within 2.5 hours, continue the heat preservation reaction for 1 hour to 2 hours after the drop, lower the temperature and add 84.5 parts of liquid alkali to adjust the pH value to 7.5~8, and obtain a silicon-containing polyacrylate SPP-1.

[0031] Step 2. Preparation of low air-en...

Embodiment 2

[0034] Step 1. Preparation of silicon-containing polyacrylate: Add 185 parts of acrylic acid and 130 parts of ethyl acrylate, 92.5 parts of isooctyl acrylate, 55 parts of Hydroxyethyl acrylate, 37.5 parts of methyl hydrogen silicone oil, 3 parts of Span 60, 4 parts of sodium dodecylbenzenesulfonate, 0.5 parts of ammonium persulfate and 280 parts of water, heated and stirred at 45°C to 50°C at high speed Emulsify for 1 hour; preformulate the remaining 1.5 parts of ammonium persulfate with 50 parts of water to form an initiator solution; transfer the pre-emulsion to a container, add 170 parts of water to the reaction kettle, raise the temperature to 65°C-70°C and stir at a constant speed; At the same time, the pre-emulsion and the initiator solution are added dropwise through the constant flow pump, and the drop is completed within 2.5 hours. After the drop, continue the heat preservation reaction for 1 to 2 hours, cool down and add 78 parts of liquid alkali to adjust the pH valu...

Embodiment 3

[0038] Step 1. Preparation of silicon-containing polyacrylate: Add 192.5 parts of acrylic acid and 195 parts of ethyl acrylate, 75 parts of hydroxypropyl acrylate, 37.5 parts of Methyl hydroxy silicone oil, 2.5 parts of Span 80, 5.5 parts of sodium dodecylbenzene sulfonate, 1 part of potassium persulfate and 280 parts of water; heat and stir and emulsify at 45 ° C ~ 50 ° C for 1 hour; the remaining 3 Add 60 parts of potassium persulfate and 60 parts of water to form an initiator solution; transfer the pre-emulsion to the container, add 160 parts of water to the reaction kettle, raise the temperature to 65 ° C ~ 70 ° C and stir at a constant speed; The emulsion and initiator solution should be dripped within 2.5 hours. After dripping, continue to keep warm for 1-2 hours, cool down and add 81 parts of liquid alkali to adjust the pH value to 7.5-8 to obtain a silicon-containing polyacrylate SPP-3.

[0039] Step 2. Preparation of low air-entraining solid polycarboxylate water-red...

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Abstract

The invention discloses a method for preparing a low-air-entraining solid polycarboxylate water reducer, comprising: step 1, using acrylic acid and acrylate monomers, silicone oil to prepare a silicon-containing Polyacrylate; step 2, copolymerize the prepared silicon-containing polyacrylate, prenol polyoxyethylene ether and acrylic acid under the action of an oxidation-reduction composite initiator and a chain transfer agent to obtain a high-concentration polycarboxylic acid It is a water reducing agent; step 3, turn on the vacuum system and continue to keep warm, so that the high-concentration polycarboxylate water reducer is vacuum dehydrated, and then sent to a condensing microtome through a heat preservation pipeline for slicing, that is, white flakes with low air-entraining Type solid polycarboxylate water reducer. The present invention can adjust the surface tension of the water reducer by adjusting the composition of the polyether monomer in the polycarboxylate water reducer and introducing other hydrophobic groups, so that the molecules of the water reducer have the effect of eliminating foam and controlling the foam, and then solve the problem of the water reducer in concrete. The problem of large gas content.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a low air-entraining solid polycarboxylate water reducer, and in particular to a preparation method of the water reducer. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the large-scale implementation of the national railway passenger dedicated line network project, the market demand for polycarboxylate water reducers continues to grow. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have become the key materials for high-performance concrete due to their excellent properties such as high water reducing rate, low slump loss, and low alkali content. [0003] The air content problem caused by the application of polycarboxylate water reducers has always been a difficulty that plagues the concrete in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/06C08F220/06C08F2/40C08F2/44C08F283/12C08F220/14C08F220/28C04B24/26C04B103/30
Inventor 陈国新祝烨然王冬杜志芹刘兴荣蔡明黄国泓付丹华王凤
Owner NANJING RUIDI HIGH TECH
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