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Mud resistant type water reducing agent and preparation method therefor

A water-reducing agent and anti-mud type technology, which is applied in the field of anti-mud-type water reducing agent and its preparation, can solve the problems of high price of cationic monomer, influence on the performance of water reducing agent, and increasing the comprehensive cost of concrete admixtures, etc. The effect of using less monomer, increasing steric hindrance, and good mud resistance

Active Publication Date: 2017-07-04
JIANGSU OXIRANCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN 102617811B prepares an amphoteric vinyl polymer anti-mud agent, which can effectively inhibit the influence of mud content on the performance of the water-reducing agent, but the anti-mud agent needs to be used in combination with the water-reducing agent, which will increase the amount of concrete admixture overall costs
CN 104009482A, CN 103772623A, CN 103467670B and other patents consider the molecular structure of the water reducer, and introduce cationic groups of quaternary ammonium salts to inert the soil activity, so that the water reducer can resist mud. Although the introduction of the water-reducing agent plays a role in anti-mud, it often affects the performance of the water reducer. In addition, the price of the cationic monomer is generally high, and its economy also needs to be considered

Method used

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  • Mud resistant type water reducing agent and preparation method therefor
  • Mud resistant type water reducing agent and preparation method therefor
  • Mud resistant type water reducing agent and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In the reaction kettle with negative pressure conditions, start stirring, add dimethyl carbonate and sulfuric acid, slowly raise the temperature to 80-90°C, and double drop 1-butenol and hydroquinone into the reaction kettle. Wherein, the feeding molar ratio of the three reactants is: dimethyl carbonate: 1-butenol: hydroquinone = 1: 1.5: 1.5, and the catalyst addition is 0.2% of the total feeding mass. As the reaction proceeds, the product methanol is continuously discharged from the system. When the methanol no longer flows out, the temperature is lowered for 20 minutes and the material is discharged. According to the difference in boiling point, the product is subjected to vacuum distillation to separate by-products to obtain the starting agent.

[0047] 207 g of starter and 1.0 g of KOH were added to the high pressure reactor. Seal the device and replace it with nitrogen 3 times. Start stirring, heat up, and when the temperature reaches 110°C, feed 10g of ethylene ...

Embodiment 2

[0053] In the reaction kettle with negative pressure conditions, start stirring, add dimethyl carbonate and sulfuric acid, slowly raise the temperature to 80-90°C, and double drop 1-butenol and hydroquinone into the reaction kettle. Wherein, the feeding molar ratio of the three reactants is: dimethyl carbonate: 1-butenol: hydroquinone = 1: 1.5: 1.5, and the catalyst addition is 0.2% of the total feeding mass. As the reaction proceeds, the product methanol is continuously discharged from the system. When the methanol no longer flows out, the temperature is lowered for 20 minutes and the material is discharged. According to the difference in boiling point, the product is subjected to vacuum distillation to separate by-products to obtain the starting agent.

[0054] 207 g of starter and 1.0 g of KOH were added to the high pressure reactor. Seal the device and replace it with nitrogen 3 times. Start stirring, heat up, and when the temperature reaches 110°C, feed 10g of ethylene ...

Embodiment 3

[0060] In a reaction kettle with negative pressure conditions, start stirring, add dimethyl carbonate and sulfuric acid, slowly raise the temperature to 80-90°C, and double drop 2-methyl-heptenol and p-hydroxybenzyl alcohol into the reaction kettle. Wherein, the molar ratio of the three reactants is: dimethyl carbonate: 2-methyl-heptenol: p-hydroxybenzyl alcohol = 1:1.5:1.5, and the catalyst addition is 0.2% of the total mass of the feed. As the reaction proceeds, the product methanol is continuously discharged from the system. When the methanol no longer flows out, the temperature is lowered for 20 minutes and the material is discharged. According to the difference in boiling point, the product is subjected to vacuum distillation to separate by-products to obtain the starting agent.

[0061] 277 g of starter and 1.0 g of KOH were added to the high pressure reactor. Seal the device and replace it with nitrogen 3 times. Start stirring, heat up, and when the temperature reache...

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Abstract

The invention provides a mud resistant type water reducing agent and a preparation method therefor. The water reducing agent is prepared by copolymerizing a monomer A, a monomer B and a monomer C. The monomer B is unsaturated carboxylic acid monomers; the monomer C is unsaturated ester monomers. The structure of the monomer A is shown in the description: R1 is hydrogen or methyl; R2 is alkylidene with 1 to 5 carbon atoms; R3 is phenylene or benzylene; m and n are integers greater than zero, m is greater than or equal to 1 and less than or equal to 180, and n is greater than or equal to 1 and less than or equal to 3.

Description

technical field [0001] The invention relates to a mud-resistant water reducer and a preparation method thereof, in particular to a mud-resistant water reducer suitable for concrete with high mud content and a preparation method thereof. Background technique [0002] From the late 1960s to the early 1970s, the development of water reducing agents was dominated by high-efficiency water reducing agents represented by naphthalene-based and melamine-based. At this stage, concrete technology was greatly developed, but naphthalene-based and melamine-based water-reducing agents The concrete flow effect of the agent is poor, and the slump changes greatly over time. The problem of concrete slump loss cannot be fundamentally solved by means of multiple addition methods, post-mixing methods, and compounding with retarders. A large amount of industrial waste gas will inevitably cause environmental pollution. Therefore, in order to meet the development needs of concrete technology, polyca...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/06C08F222/02C08F218/08C08F220/14C04B24/16
CPCC04B24/163C04B2103/302C08F283/06C08F220/06C08F222/06C08F222/02C08F220/04
Inventor 朱建民刘兆滨董振鹏顾晓华刘丙柱
Owner JIANGSU OXIRANCHEM CO LTD
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