Alkyl polyoxyether and preparation method thereof, and polycarboxylate superplasticizer prepared from alkyl polyoxyether and preparation method thereof

A technology of polyoxyalkyl ether and polycarboxylic acid, applied in the fields of polyoxyalkylene water reducing agent and preparation, polyoxyalkylene ether and preparation thereof, can solve the problem of concrete bleeding and segregation, high production cost and low water reduction rate and other problems, to achieve a good slow-release effect, delay the hydrolysis rate, and improve the water reduction rate.

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

[0003] The traditional high-performance polycarboxylate water-reducing agent has a high water-reducing rate, but its slump-retaining performance is poor, and its single use will cause the slump loss of concrete to be too fast, which will bring great difficulties to the construction, and even cause concrete failure. Therefore, it must be compounded with the high-retention slump water reducer mother liquor in a certain proportion during use, resulting in difficult control of product quality, complicated production process and high production cost
In the application process of the compound product, one of them may be insufficient or excessive, which will bring more difficulties to the construction. For example, the amount of high slump-retaining water-reducing agent in the compound product is insufficient, which will cause the loss of concrete slump If it is too fast, the amount of

Method used

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  • Alkyl polyoxyether and preparation method thereof, and polycarboxylate superplasticizer prepared from alkyl polyoxyether and preparation method thereof
  • Alkyl polyoxyether and preparation method thereof, and polycarboxylate superplasticizer prepared from alkyl polyoxyether and preparation method thereof
  • Alkyl polyoxyether and preparation method thereof, and polycarboxylate superplasticizer prepared from alkyl polyoxyether and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1 Synthesis of monomer A

[0042] Add 26.8g cinnamyl alcohol and 0.35g sodium methoxide into the high-pressure reactor, seal the equipment, and replace the air in the high-pressure reactor with nitrogen. The temperature is raised to 100~120℃, and 290g of ethylene oxide raw material is introduced. When the temperature rises, the pressure drops It is indicated that the reaction is initiated, and then 30 g of propylene oxide is introduced, and the reaction temperature is controlled at 110-130°C and the pressure in the kettle is at 0.3-0.5 MPa.

[0043] After the reaction is completed, the pressure in the kettle gradually drops to the point where the pressure does not drop for 30 consecutive minutes, and the material is aged and cooled to obtain the A monomer. NMR of A monomer 1 H spectrum such as figure 1 Shown (400MHz, D 2 O).

Example Embodiment

[0044] Example 2 Synthesis of monomer B

[0045] Add 20.5g 4-hydroxystyrene and 0.36g sodium methoxide into the high-pressure reactor, seal the equipment, replace the air in the high-pressure reactor with nitrogen, raise the temperature to 100-120°C, and feed 300g ethylene oxide raw material. The increase in temperature and the decrease in pressure indicate the initiation of the reaction. After that, 45 g of propylene oxide is introduced, and the reaction temperature is controlled at 110-130°C and the pressure in the kettle is at 0.3-0.5 MPa.

[0046] After the reaction is completed, the pressure in the kettle gradually drops to the point where the pressure does not drop for 30 consecutive minutes, and the material is aged and cooled to obtain the B monomer. NMR of B monomer 1 H spectrum such as figure 2 Shown (400MHz, deuterated dimethyl sulfoxide).

Example Embodiment

[0047] Example 3 Preparation of polycarboxylic acid water reducing agent

[0048] Add 295g monomer A, 275g deionized water, 3.5g cyclohexyl acrylate to a 1000ml round bottom three-necked flask, stir to dissolve evenly, add 1.8g hydrogen peroxide with a mass concentration of 30%, reaction temperature 40℃, and add A solution dropwise With the B solution, the dripping time is 1h. After the dripping, continue to react for 1h to obtain a clear and bright polycarboxylic acid water-reducing agent mother liquor.

[0049] The first solution is formed by 28g acrylic acid, 20g deionized water and 0.5g ascorbic acid; the second solution is formed by 1.2g thioglycolic acid and 30g deionized water.

[0050] The weight average molecular weight of the polycarboxylic acid water reducing agent obtained by gel chromatography test is about 35,700.

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Abstract

The invention provides alkyl polyoxyether with a structure as shown in a formula (I) or formula (II) which is described in the specification. The invention also provides a preparation method for the alkyl polyoxyether, a polycarboxylate superplasticizer prepared with the alkyl polyoxyether as a polymerization monomer and a preparation method for the polycarboxylate superplasticizer. The alkyl polyoxyether provided by the invention contains a phenyl ring which exerts great steric hindrance effect in a polymer molecule in preparation of the polycarboxylate superplasticizer, so the prepared polycarboxylate superplasticizer is endowed with better slump loss resistance. The polycarboxylate superplasticizer provided by the invention uses the alkyl polyoxyether as the monomer, has the both advantages of high water-reducing rate and high slump loss resistance, and is convenient to use and obviously reduced in the doping rate in concrete; so cost for production and construction is reduced, requirements of environmental protection are better met, and immense economic and social benefits can be produced.

Description

technical field [0001] The invention relates to the field of high molecular polymers, in particular to a polyoxyalkyl ether and a preparation method thereof, a polycarboxylate water reducer obtained therefrom and a preparation method thereof. Background technique [0002] With the implementation of the "One Belt, One Road" strategy, a round of infrastructure construction climax has emerged along the Belt and Road and surrounding areas, and the demand for commercial concrete has increased sharply. However, as an indispensable component of commercial concrete, the demand for water reducers The volume has also increased, but its market competition has become more intense, so it is increasingly important to increase research and development of new products. [0003] The traditional high-performance polycarboxylate water-reducing agent has a high water-reducing rate, but its slump-retaining performance is poor, and its single use will cause the slump loss of concrete to be too fa...

Claims

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Application Information

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IPC IPC(8): C08G65/28C08F283/06C08F220/06C08F220/18C08F222/06C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C08G65/2609C08G65/2612C04B2103/30C08F220/1806C08F220/1818C08F220/1804
Inventor 朱建民刘兆滨董振鹏顾晓华韩海峰
Owner JIANGSU OXIRANCHEM CO LTD
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