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Polycarboxylate-type water reducer monomer polyether and preparation method for midbody thereof

A technology of monomer polyether and polycarboxylate, applied in the field of polycarboxylate superplasticizer monomer polyether, can solve the problem that polycarboxylate superplasticizer monomer polyether has many impurities, incomplete catalyst dissolution, Long reaction time and other problems, to achieve the effect of increasing product profit margin, reducing residual and side reactions, and short preparation time

Inactive Publication Date: 2017-06-30
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in order to overcome the low safety in the production process of the polycarboxylate water reducer monomer polyether intermediate in the prior art, it is easy to cause equipment damage, long reaction time, incomplete catalyst dissolution, There are many by-products, the prepared polycarboxylate water reducer monomer polyether has many defects such as impurities, and a preparation method of polycarboxylate water reducer monomer polyether and its intermediate is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Raw material formula: 500 parts of isopentenol, 12 parts of sodium metal.

[0040] Preparation of monomeric polyether intermediate: Add prenyl alcohol into a reaction kettle equipped with a glove box and ventilation device, which also includes an exhaust and vacuum system. Stir evenly, detect that the water content is less than 0.05% (mass fraction), then stop stirring, add metal sodium to react and blow nitrogen at the same time, the pressure is a slight positive pressure (0-0.02Mpa), and open the valve of the open air pipeline at the same time to release hydrogen. The reaction temperature is controlled within the range of 25-35°C, and the pressure is normal pressure (0Mpa); when the catalyst metal sodium is added, the temperature can be kept for 4-5 hours to take a sample, and the water content is less than 0.08% (using GB6283 "chemical products Karl Fischer method (general method) ") for the determination of moisture content in the medium), and the polycarboxylate wa...

Embodiment 2

[0044] Raw material formula: 500 parts of methacryl alcohol, 15 parts of sodium hydride.

[0045] Preparation of monomeric polyether intermediate: add the above-mentioned methacryl alcohol into a reaction kettle equipped with a glove box and a nitrogen ventilation device, and the device also includes an evacuation and vacuum system. Stir evenly, check that the water content (less than 0.05%) is qualified, then stop stirring and add sodium hydride to react and blow nitrogen at the same time. The reaction temperature is controlled within the range of 25-35° C., and the pressure is normal pressure; when the catalyst is added and reacted for 5 hours, the preparation of the intermediate is completed.

[0046] Preparation of monomeric polyether: Put 60 parts of the intermediate prepared in the previous step into the reaction kettle of the ethoxy unit and replace it with nitrogen to remove oxygen and other gaseous polymerization-inhibiting components. The replacement operation is as...

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Abstract

The invention discloses a polycarboxylate-type water reducer monomer polyether and a preparation method for a midbody thereof. The preparation method for the polycarboxylate-type water reducer monomer polyether midbody, provided by the invention, comprises the steps of mixing an enol initiator with water content of less than 0.05% with a catalyst and reacting under the temperature of below 35 DEG C and under a nitrogen bubbling condition, wherein stirring is not required in the mixing and reaction processes of the enol initiator and the catalyst. According to the preparation method for the polycarboxylate-type water reducer monomer polyether midbody, provided by the invention, the content of the side reactant can be obviously reduced, the damage to the device can be reduced, the production process is safe, the operation method is simple and convenient and the prepared polycarboxylate-type water reducer monomer polyether contains few impurities.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer monomer polyether and a preparation method of an intermediate thereof. Background technique [0002] Water reducers are widely used in the field of construction and concrete mortar, which can significantly improve the performance of concrete products, reduce the amount of water added, and shorten the curing time. In recent years, they have been widely used in the construction of high-speed railways in my country, and are also used by civilians. widely used in construction. [0003] The production of the existing water reducer monomer polyether generally adopts the batch production method. Due to the influence of the catalyst addition method in the production process, the product quality is low, and a part of the unreacted epoxy is discharged in the name of small molecules. , discharged into other absorption media, or directly discharged into the environment, which not only causes pollution but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2648
Inventor 赵鑫涂天平杜辉董总王振波
Owner SHANGHAI DONGDA CHEM
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