Terminal alkenyl nonsaturated polyether and purpose thereof

An unsaturated, ethylenically-terminated technology, used in the preparation of polycarboxylate superplasticizers and ethylenically-terminated unsaturated polyethers, can solve the problems affecting the application performance of methallyl ether, high polyethylene glycol content, and polyether. The problem of increasing ethylene glycol content, etc., can improve the steric hindrance effect, improve the dispersion effect, and increase the double bond retention rate.

Active Publication Date: 2016-02-17
SICHUAN SEDAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of synthesizing ethylene glycol methyl allyl ether, various by-products are generated, and the ethoxylation reaction on this basis will easily lead to a high content of polyethylene glycol. At the same time, sodium hydroxide is the most preferred in this patent And potassium hydroxide catalyst, this will also easily lead to an increase in the content of polyethylene glycol, thereby affecting the application performance of methallyl alcohol ether

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  • Terminal alkenyl nonsaturated polyether and purpose thereof
  • Terminal alkenyl nonsaturated polyether and purpose thereof
  • Terminal alkenyl nonsaturated polyether and purpose thereof

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preparation example Construction

[0066] In the preparation process of the polyether of the present invention, the alkoxylation reaction is carried out under the catalysis of a basic catalyst. The basic catalyst used can be any catalyst used in the existing alkoxylation reaction, and its analogue or modified product can also be used.

[0067] In one embodiment of the preparation process of the polyether of the present invention, the basic catalyst can be alkaline earth metal compounds and alkali metal compounds, including but not limited to alkaline earth metal oxides, alkali metal carbonates, alkaline earth metal hydroxides, alkali metal Hydroxides, alkaline earth metal alkoxides and alkali metal alkoxides, especially alkali metal C1-C4 alkoxides. The above catalysts may be used alone or in combination of two or more.

[0068] In a preferred embodiment, basic catalysts include, but are not limited to, hydroxides, oxides, hydrides, and alkoxides of sodium, potassium, rubidium, cesium, calcium, and magnesium. ...

Embodiment 1

[0080] Weigh 119.4g of methallyl alcohol and 1.3g of solid potassium methylate catalyst into the reactor, start stirring, heat to 80°C, then evacuate the reactor to 5kPa and fill the vacuum with nitrogen, repeat vacuuming and filling with nitrogen Vacuum three times.

[0081] Then make the reaction kettle warm up to 100°C, then start to add propylene oxide, control the reaction temperature at 140°C, and the reaction pressure is 0.4MPa, when 192.3g of propylene oxide has been added, keep the temperature in the still at 140°C 0.8 hours. Then add ethylene oxide, control the reaction temperature at 140°C, and the reaction pressure is 0.4MPa. After adding 2188.3g of ethylene oxide, keep the temperature in the kettle at 140°C for 0.5 hours, then neutralize with acetic acid to pH 5.0-7.0, and cooled to room temperature to obtain terminal ethylenically unsaturated PE type polyoxyalkyl ether A1.

[0082] According to GPC analysis (30 ℃, with polyethylene glycol as the standard produc...

Embodiment 2

[0087] Weigh 63.1g of methallyl alcohol and 1.6g of solid potassium methylate catalyst into the reactor, start stirring, heat to 80°C, then evacuate the reactor to 5kPa and fill the vacuum with nitrogen, repeat vacuuming and filling with nitrogen Vacuum three times.

[0088]Then make the reaction kettle warm up to 100°C, then start to add propylene oxide, control the reaction temperature at 130°C, and the reaction pressure is 0.4MPa, when 508.4g of propylene oxide has been added, keep the temperature in the still at 130°C 0.8 hours. Then add ethylene oxide, control the reaction temperature at 130°C, and the reaction pressure is 0.4MPa. After adding 1928.5g of ethylene oxide, keep the temperature in the kettle at 130°C for 0.5 hours, then neutralize with acetic acid to pH 5.0-7.0, and cooled to room temperature to obtain terminal ethylenically unsaturated PE type polyoxyalkyl ether A2.

[0089] According to GPC analysis (30° C., using polyethylene glycol as a standard product...

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Abstract

The invention provides terminal alkenyl nonsaturated polyether shown in a formula (1), and the invention also provides a purpose of the terminal alkenyl nonsaturated polyether. According to the provided terminal alkenyl nonsaturated polyether, a polyether chain segment can be adjusted through different structural units, so that dispersion effect of a prepared water reducer on concrete is increased, and water-reducing rate of a polycarboxylic acid water reducer and slump constant are obviously increased. The preparation method has the advantages of simple operation, mild condition and easy industrial application.

Description

technical field [0001] The invention relates to the field of high molecular polymers, in particular to a terminal ethylenically unsaturated polyether and its use in preparing polycarboxylate water reducers. Background technique [0002] The commercialization and high performance of concrete are realized by concrete admixtures, among which the most critical variety is water reducing agent, which accounts for more than 80% of the total admixture dosage. With the steady development of my country's concrete water reducer manufacturing industry, especially the promulgation of relevant national policies, my country's concrete water reducer manufacturing industry has ushered in a good opportunity for development. At present, my country's concrete superplasticizer products are complete in variety, with continuous improvement in performance, and its output ranks first in the world. , Bridges and other infrastructure construction and the rapid growth of real estate demand. [0003] P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08F283/06C04B24/26C04B103/30
Inventor 朱建民刘兆滨董振鹏周立明李雪峰于连林
Owner SICHUAN SEDAR CHEM
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