A kind of preparation method of branched chain type aliphatic water reducing agent with high water reducing rate

An aliphatic water-reducing agent and high water-reducing rate technology, applied in the field of preparation of branched-chain aliphatic water-reducing agent, can solve the problems of easy bleeding, low water-reducing rate, poor slump retention performance, etc.

Inactive Publication Date: 2016-04-06
KZJ NEW MATERIALS GROUP CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of aliphatic high-efficiency water-reducing agents are that the water-reducing rate is low during the concrete application process, the slump retention performance is poor, and it is easy to bleed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In terms of parts by mass, add 60 parts of sodium sulfite and 220 parts of water into the reactor, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 55 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. Control the reaction temperature to 50 ℃, keep warm for 0.5 hours.

[0019] Add 170 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.

[0020] After the dropwise addition, add 18 parts of isobutylene polyoxyethylene ether HPEG-2400 mixed with 100 parts of water, and mix 3 parts of tert-butyl hydroperoxide / hangbai block with 40 parts of water, Add dropwise to the system within 1 hour, keep warm for 2 hours, and cool to room temperature to obtain the product.

Embodiment 2

[0022] In terms of parts by mass, add 40 parts of sodium sulfite, 10 parts of sodium metabisulfite and 220 parts of water into the reaction kettle, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 60 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. Control the reaction temperature to 45° C. and keep it warm for 0.5 hours.

[0023] Add 180 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.

[0024] Add 10 parts of isobutylene polyoxyethylene base ether HPEG-2400 and 5 parts of isobutylene polyoxyethylene base ether TPEG1200 and 100 parts of water preparation mixture, and 3 parts of potassium persulfate / ferrous chloride and 40 parts A mixed solution made of 100% water was added dropwise to the system within 1 hour, kept warm for 3 hours, and cooled to room temperature to obtain the product.

Embodiment 3

[0026] In terms of parts by mass, add 40 parts of sodium metabisulfite and 220 parts of water in the reactor, stir and dissolve, add liquid caustic soda to adjust the pH value of the solution to 13, add 55 parts of acetone dropwise, and complete the dropwise addition within 0.5 hours. 50°C, keep warm for 0.5 hours.

[0027] Add 170 parts of formaldehyde dropwise within 1.5 hours, and control the temperature to ≤85°C.

[0028] Dropping finishes, adds the mixed solution that 20 parts of isopentenyl polyoxyethylene base ethers TPEG2400 and the water preparation of 100 parts, and the mixed solution that 3 parts of potassium persulfate / ferrous chloride and 40 parts of water are made, in 1 Add it dropwise to the system within hours, keep it warm for 2.5 hours, and cool to room temperature to obtain the product.

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PUM

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Abstract

The invention discloses a preparation method of a high water-reducing rate branched chain type aliphatic series water reducing agent. The preparation method comprises the following steps of: in parts by mass, adding 40-60 parts of sulfite and 220 parts of water into a reaction kettle; stirring for dissolving; adding liquid alkali to adjust the pH value of the solution to be 13; dropping 50-60 parts of acetone within 0.5-1 hour; controlling the reaction temperature to be 45-55 DEG C; preserving the temperature for 0.5 hour; dropping 170-190 parts of methanal within 1.5-2.5 hours; controlling the temperature to be less than or equal to 85 DEG C; adding a mixture solution prepared from 10-25 parts of polyoxyethylene ether macromonomer and 100 parts of water; dropping another mixture solution prepared from 2-5 parts of a water-soluble oxidation-reduction initiator and 40 parts of water into the system; preserving the temperature for 2-3 hours; and cooling to the room temperature so as to obtain the water reducing agent. The water reducing agent prepared by using the preparation method is greatly improved in water reducing rate, is enhanced in collapse-prevention function, and is high in air content good in air conduction capability; and the problem that bleeding is easy is overcome.

Description

technical field [0001] The invention relates to a method for preparing a branched aliphatic water reducer, in particular to a method for preparing a branched aliphatic water reducer with a high water reducing rate. Background technique [0002] Adding water reducing agent to concrete can improve the fluidity of concrete mixture, or reduce the water consumption of concrete mixture while maintaining the same fluidity, and at the same time, can make concrete have high durability, so it can Water reducing agent has become an important component of concrete for high fluidity concrete, pump concrete, high strength performance concrete and high density concrete, etc. [0003] In the prior art, the third-generation polycarboxylate high-performance water reducer has the advantages of high water reducing rate, good slump retention and environmental friendliness. However, the main raw material of polycarboxylate superplasticizer depends on petroleum and is sensitive to aggregates such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08G6/02C04B24/16C04B103/30
Inventor 郑飞龙方云辉赖广兴郑昌涯赖华珍陈小彬林添兴于飞宇温庆如
Owner KZJ NEW MATERIALS GROUP CO LTD
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