Block polyether, air entrained type polycarboxylate water reducing agent prepared by block polyether and preparation method thereof

A technology of block polyether and water reducer, which is applied in the field of air-entraining polycarboxylate water reducer, which can solve the problems of concrete appearance and performance impact, difficulty in complete polymerization, floating and delamination, etc., to ensure strength and crack resistance The effect of improving performance, improving gas content, and excellent working performance

Inactive Publication Date: 2015-07-01
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the allyl polyoxypropylene ether, styrene, and ethyl acetate used in this method are oil-soluble monomers, and their solubility in water is very small. During the aqueous solution copolymerization process, they need to participate in the polymerization reaction through the continuous establishment of dissolution equilibrium. , making it difficult to completely polymerize, and the remaining oil-soluble monomers will float and stratify, which will also affect the appearance and performance of the mixed concrete

Method used

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  • Block polyether, air entrained type polycarboxylate water reducing agent prepared by block polyether and preparation method thereof
  • Block polyether, air entrained type polycarboxylate water reducing agent prepared by block polyether and preparation method thereof
  • Block polyether, air entrained type polycarboxylate water reducing agent prepared by block polyether and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Preparation of block polyethers

[0046] Add 3.0g of methallyl alcohol and 0.02g of basic catalyst KOH into the reactor, replace the inside of the reactor with nitrogen three times, empty the nitrogen in the reactor until the pressure inside the reactor is 0.02-0.05MPa, and raise the temperature in the reactor to to 120°C. Maintain the temperature, add 25.0g EO (ethylene oxide) continuously within 2h (hour), and age for 20-30min. Raise the temperature to 150°C, continuously add 21.6g PO (propylene oxide) within 1.5h, maintain the reaction temperature, and age for 40 to 60 minutes. After cooling down to 120°C, add 12.8g of ethylene oxide continuously within 1h, maintain the reaction temperature, and age for 40-60min. After aging, cool down to 60°C, add acetic acid to neutralize, and discharge. The obtained block polyether has a weight average molecular weight of 1400 and a double bond retention rate of 91.05%. (m+k)y+x=29, y=1, x=7.

[0047] Preparation of air-entrai...

Embodiment 2

[0051] Preparation of block polyethers

[0052] Add 3.45g prenyl alcohol and 0.03g basic catalyst KOH into the reactor, carry out 3 nitrogen replacements in the reactor, empty the nitrogen in the reactor until the pressure in the reactor is 0.02-0.05MPa, and raise the temperature in the reactor to 120°C. Maintain the reaction temperature, add 17.62g EO continuously within 1.0h, and age for 20-30min. Raise the temperature to 150°C, add 11.62g PO continuously within 1h, maintain the reaction temperature, and age for 40-60min. After cooling down to 120°C, 17.62g of EO was continuously added within 1h, and the temperature was raised to 150°C, and 11.62g of PO was continuously added within 1h to maintain the reaction temperature and aged for 40-60min. After aging, cool down to 60°C, add acetic acid to neutralize, and discharge. The obtained block polyether has a weight average molecular weight of 1550 and a double bond retention rate of 89.87%. m+k=15, y=2, x=0.

[0053] Prepa...

Embodiment 3

[0057] Preparation of block polyethers

[0058] Add 2.32g of allyl alcohol and 0.02g of basic catalyst KOH into the reactor, replace the reactor with nitrogen 3 times, empty the nitrogen in the reactor until the pressure in the reactor is 0.02-0.05MPa, and raise the temperature in the reactor to to 120°C. Maintain the reaction temperature, add 21.14g EO continuously within 2h, and age for 20-30min. Raise the temperature to 150°C, add 13.94g PO continuously within 1.5h, maintain the reaction temperature, and age for 40-60min. After cooling down to 120°C, add 21.14g of EO continuously within 2h, maintain the reaction temperature, and age for 40-60min, then raise the temperature to 150°C, add 13.94g PO continuously within 1.5h, maintain the reaction temperature, and age for 40-60min. After cooling down to 120°C, add 21.14g of EO continuously within 2h, maintain the reaction temperature, and age for 40-60min, then raise the temperature to 150°C, add 13.94g PO continuously within...

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Abstract

The present invention provides a block polyether, an air entrained type polycarboxylate water reducing agent prepared by the block polyether and a preparation method thereof, the air entrained type polycarboxylate water reducing agent not only has excellent work performance, also has the function of improving the air content in concrete, can not only avoid the a series of compatibility problems caused by compounding with an initiator, also can replace a calcium lignosulphonate water reducer and can ensure the concrete strength and anti cracking performance. In addition, due to the polyether special block structure, the air entrained type polycarboxylate water reducing agent has surface activity different from that of unsaturated polyglycol ether, and can be soluble in an aqueous solution so as to avoid the occurrence of delamination and other situations.

Description

technical field [0001] The invention relates to an air-entraining polycarboxylate water reducer, in particular to an air-entraining polycarboxylate water reducer containing a block polyether and a preparation method thereof. Background technique [0002] With the continuous launch of national infrastructure construction and the formulation of urbanization policies and guidelines, the amount of concrete used in my country will continue to maintain a trend of rapid increase. At the same time, while meeting the requirements of existing engineering construction, the demand for high-performance concrete is becoming stronger and stronger, especially for high-strength, high-durability, crack-resistant, and corrosion-resistant concrete. This requires the concrete admixture industry to continuously develop admixtures that improve the performance of the above-mentioned concrete to meet the demand for high-performance concrete in the construction market. [0003] Numerous research res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08F291/06C08F283/06C08F2/10C08F2/38C04B24/32C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明刘枫
Owner LIAONING OXIRANCHEM INC
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