A kind of polyhydroxy PEG macromonomer and preparation method thereof

A macromonomer and polyhydroxyl technology, applied in the field of polyhydroxy PEG macromonomer and its preparation, can solve the problems of large increase in engineering cost and complex synthesis process, and achieve the effects of high cost performance, easy availability of raw materials, and improved water retention.

Active Publication Date: 2019-08-23
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] Although the use of these shrinkage reducing agents reduces the shrinkage of concrete to a certain extent, the engineering cost increases greatly and the synthesis process is complicated.

Method used

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  • A kind of polyhydroxy PEG macromonomer and preparation method thereof
  • A kind of polyhydroxy PEG macromonomer and preparation method thereof
  • A kind of polyhydroxy PEG macromonomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A kind of embodiment of the preparation method of polyhydroxy PEG macromonomer of the present invention, comprises the following steps:

[0074] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1mol of propylene alcohol and 0.2g of catalyst NaOH, raise the temperature of the reactor to 70-85°C, and slowly add 1mol of epoxy Ethane, so that the reaction temperature is controlled within the range of 70 ° C, the pressure in the kettle is controlled at 0.2 MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature is controlled At 80°C, the reaction was continued for 5h to obtain an intermediate product with the desired molecular weight.

[0075] (2) Keep the temperature at 80° C., start to slowly add 1 mol of glycidol dropwise, and control the dropwise addition for 1.5 hours. After the dropwi...

Embodiment 2

[0077] A kind of embodiment of the preparation method of polyhydroxy PEG macromonomer of the present invention, comprises the following steps:

[0078] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly for 3 times, inject 1mol of prenyl alcohol and 0.5g of catalyst potassium hydroxide, raise the temperature of the reactor to 110°C, and start to slowly add 4mol ethylene oxide, so that the reaction temperature is controlled within the range of 115 ° C, the pressure in the kettle is controlled at 0.4 MPa, and the amount of ethylene oxide required for dripping is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, The temperature was controlled at 110°C, and the reaction was continued for 2 hours to obtain an intermediate product with the desired molecular weight.

[0079] (2) Lower the temperature to 80° C., start to slowly add 2 mol of glycidol dropwise, and control the dropwise addition for...

Embodiment 3

[0081] A kind of embodiment of the preparation method of polyhydroxy PEG macromonomer of the present invention, comprises the following steps:

[0082] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1mol of isobutenol and 2g of catalyst potassium carbonate, raise the temperature of the reactor to 115°C, and slowly add 80mol of ethylene oxide dropwise Alkanes, so that the reaction temperature is controlled within the range of 130 °C, the pressure in the kettle is controlled at 0.6MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature is controlled at At 120°C, the reaction was continued for 0.5h to obtain an intermediate product with the desired molecular weight.

[0083] (2) Lower the temperature to 80° C., start to slowly add 3 mol of glycidol dropwise, and control the dropwise addition f...

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Abstract

The invention provides a polyhydroxy PEG macromonomer. According to a water-retaining shrinkage reduction type polycarboxylate superplasticizer synthesized with the polyhydroxy PEG macromonomer, due to the hydrophilia of hydroxy groups, hydrogen bonds between hydroxy groups and between hydroxy groups and water molecules and mico-crosslinked structures formed between hydrogen bonds, the viscosity of a pore aqueous solution and cement paste can be significantly improved, the water evaporation rate can be reduced, and an excellent water retaining property can be achieved. Concrete shrinkage reduction test results show that the water-retaining shrinkage reduction type polycarboxylate superplasticizer has a good shrinkage reduction effect, compared with a common ether polycarboxylate superplasticizer in the company, the 28 d shrinkage ratio of concrete is significantly reduced, and the water-retaining shrinkage reduction type polycarboxylate superplasticizer has no influence on the peaceability or strength of concrete when used for concrete and is high in performance-cost ratio. The preparation method of the polyhydroxy PEG macromonomer is simple, raw materials are easy to obtain and low in cost, the performance-cost ratio is high, and the macromonomer can have multiple hydroxy groups (the number varies according to practical needs) through the method.

Description

technical field [0001] The invention relates to a PEG macromonomer, in particular to a polyhydroxy PEG macromonomer and a preparation method thereof. Background technique [0002] The emergence, development and wide application of concrete admixtures have endowed concrete with new vitality. Water reducing agents mixed into fresh concrete can destroy the flocculation structure of cement particles and play a role in dispersing cement particles and cement hydration particles. Thereby releasing the free water in the flocculation structure and increasing the fluidity of the concrete mixture. Polycarboxylic acid (PCEs) superplasticizers are anionic surfactants, which are mixed into cement paste, adsorbed on the surface of cement particles with cations, and dissociate into organic anion groups with hydrophilic and lipophilic effects. [0003] The molecular skeleton of PCEs superplasticizer consists of a main chain and more branched chains. The main chain contains more active grou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/331C08G65/28C08F283/06C08F220/06C08F222/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08G65/2609C08G65/3318C08F220/06
Inventor 张小富白淑英赵利华
Owner GUANGDONG REDWALL NEW MATERIALS
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