Low-cost polyester polycarboxylic acid water reducer

A technology of polyester-type polycarboxylic acid and water reducer, applied in the field of water reducer, can solve the problems that hinder the development of PEG synthetic water reducer, difficult separation of esterification products, etc., and achieve the effect of easy separation and good control effect

Inactive Publication Date: 2013-06-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because PEG 1000 is in the form of a paste, it is not easy to separate the esterified product after the esterification reaction. Therefore, there are technical difficulties in the synthesis of polycarboxylate water reducer by PEG, which hinders the development of PEG synthesis water reducer.

Method used

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  • Low-cost polyester polycarboxylic acid water reducer
  • Low-cost polyester polycarboxylic acid water reducer
  • Low-cost polyester polycarboxylic acid water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of esterified macromonomer polyethylene glycol methacrylate (esterification reaction)

[0044] Add 50g polyethylene glycol (molecular weight: 400) and 0.3g hydroquinone successively into a 250ml three-necked flask equipped with a dropping device, a thermometer, and a condenser, stir, and after heating up to 60°C, add 0.6g p-methyl Benzenesulfonic acid, 9.2g of silica gel, after hydroquinone and p-toluenesulfonic acid are completely dissolved, add methacrylic acid drop by drop (11.6g of methacrylic acid in total), and raise the temperature to 110°C within 2-3h After heat preservation, stop heating when the esterification rate is 52%, continue to store the product in the oil bath, let it slowly cool down to room temperature, and then pour out the upper layer of ester liquid (that is, the esterified macromonomer polyethylene glycol methacrylate) Stand-by, the lower layer of pale yellow solid is solidified silica gel, which contains less esters, which ...

Embodiment 2

[0045] Example 2 Preparation of low-cost polyester polycarboxylate water reducer A0 (polymerization grafting reaction)

[0046] In a three-neck flask equipped with a condensation reflux device and two sets of dropping devices, add 0.1g of chain transfer agent mercaptoacetic acid, dissolve it in a small amount of distilled water, and inject nitrogen to drive away the air (very low flow rate, 2-3 bubbles per second) ), heated and stirred to 80°C, while slowly adding the aqueous solution of the initiator (dissolve 0.46g of the initiator ammonium persulfate in water, the concentration is 0.25%), while adding the aqueous solution of the mixed monomer (the mixed monomer is 10g by the implementation Example 1 The esterified macromonomer polyethylene glycol methacrylate, 1.0gMAA, and 0.5gSMAS mixed solution obtained by the esterification reaction, the concentration of the mixed monomer aqueous solution is 25%), after about 1-2h, dropwise, continue to maintain After constant temperatur...

Embodiment 3

[0048] Example 3 Preparation of low-cost polyester polycarboxylate water reducer A1 (polymerization grafting reaction)

[0049] In a three-neck flask equipped with a condensation reflux device and two sets of dropping devices, add 0.1g of chain transfer agent mercaptoacetic acid, dissolve it in a small amount of distilled water, and inject nitrogen to drive away the air (very low flow rate, 2-3 bubbles per second) ), heated and stirred to 80°C, while slowly adding the initiator aqueous solution (0.047g of the initiator ammonium persulfate and 0.156g of the initiator auxiliary agent 30% hydrogen peroxide dissolved in water, the concentration was 0.25%), while adding the mixed mono Aqueous solution (mixed monomer is the mixed solution of 10g esterified macromer polyethylene glycol methacrylate, 1.0gMAA, 0.2gAM and 0.5gSMAS obtained by the esterification reaction of embodiment 1, and the concentration of mixed monomer aqueous solution is 25 %), about 1-2h after adding dropwise, c...

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Abstract

The invention discloses a low-cost polyester polycarboxylic acid water reducer, and relates to a building material. The low-cost polyester polycarboxylic acid water reducer is prepared from the following steps: an esterification reaction: conducting an esterification reaction on polyethylene glycol and methacrylic acid under effects of an inhibitor hydroquinone and a catalyst p-toluene sulphonic acid to generate esterification macromonomer polyethylene glycol methacrylate and water, wherein silica gel is used as an absorbent in the reaction to absorb water generated in the esterification reaction to proceed the reaction, and stopping the reaction when esterification rate reaches 40-60%; and a polymerization graft reaction: conducting isothermal reaction on the esterification macromonomer polyethylene glycol methacrylate with mixed monomer MAA, AM and SMAS in the presence of a chain transfer agent thioglycolic acid, an initiator ammonium persulfate and an initiating assistant hydrogen peroxide, cooling to room temperature after the reaction, and adding NaOH to adjust a pH value to 7. Compared with the prior art, the low-cost polyester polycarboxylic acid water reducer protected by the invention has advantages of low cost and good water reducing performance.

Description

technical field [0001] The invention relates to a water reducer, in particular to a low-cost polyester polycarboxylate water reducer and a preparation method thereof. [0002] Glossary [0003] Methoxypolyethylene glycol - abbreviated as MPEG [0004] Allyl polyoxyethylene ether - the English abbreviation is APEG [0005] Polyethylene glycol - abbreviated as PEG [0006] Acrylic - abbreviated as AA [0007] Sodium Methacrylate Sulfonate - English abbreviation SMAS [0008] Ammonium persulfate - abbreviated as APS [0009] Methacrylic acid - abbreviated as MAA [0010] Polyethylene glycol methacrylate - abbreviated as PEGMAA [0011] Acrylamide - abbreviated as AM [0012] Percentages - In the present invention, if there is no special description, the percentages are percentages by weight Background technique [0013] Since Tsuyoshi Tsubaki, a Japanese catalyst company, and others published the first patent article on the synthesis of polycarboxylate superplasticizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08G65/48C04B24/16C04B103/30
Inventor 朱霞萍梁丹陈文谭俊邓亚婷田应凤
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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