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Polyether ester, preparation method thereof, polycarboxylic acid cement grinding aid, and preparation method of same

A cement grinding aid and polyetherester technology, applied in the polymer field, can solve the problems of poor adaptability of raw materials, unstable grinding effect, unfavorable production and processing and environmental protection, etc. Effect

Pending Publication Date: 2020-05-08
JIANGSU OXIRANCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polycarboxylate cement grinding aid synthesized by the invention contains a variety of functional functional groups in the molecular structure, which can effectively improve the grinding efficiency, reduce the energy consumption of grinding, and improve the early and late strength of cement, but the two components in the composition Sodium formaldehyde sulfoxylate is easy to decompose at high temperature to produce toxic gases such as formaldehyde and hydrogen sulfide, which is not conducive to production, processing and environmental protection
[0006] In summary, the existing polycarboxylate cement grinding aids, or because of the unstable grinding aid effect, poor adaptability to raw materials, or improper selection of the type and amount of polymerized monomers, lead to polycarboxylate grinding aids in the Cannot be promoted during use

Method used

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  • Polyether ester, preparation method thereof, polycarboxylic acid cement grinding aid, and preparation method of same
  • Polyether ester, preparation method thereof, polycarboxylic acid cement grinding aid, and preparation method of same
  • Polyether ester, preparation method thereof, polycarboxylic acid cement grinding aid, and preparation method of same

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preparation example Construction

[0038] The present invention provides the preparation method of above-mentioned polyether ester, comprises the following steps:

[0039] With one or more of ethylenediamine, triethanolamine, triisopropanolamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine as the initiator, with ethylene oxide and / or epoxy Polymerization of propane to produce polyethers; and

[0040] Polyether is esterified with acrylic acid or maleic anhydride to obtain polyether ester.

[0041] Ethylenediamine, triethanolamine, triisopropanolamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine all contain N atoms, which can be used as initiators with ethylene oxide, propylene oxide or ethylene oxide The mixture of alkanes and propylene oxide is subjected to ring-opening polymerization, and the present invention has no limitation on the ratio of ethylene oxide and propylene oxide in the mixture.

[0042] In the preparation process of the present invention, the mo...

Embodiment 1

[0064] The preparation of embodiment 1 polyether ester

[0065] First pass 1mol triethanolamine into the reaction kettle, add 1.5g NaOH as a catalyst, use N 2 After the replacement, the reactor was heated, and when the temperature of the reactor was raised to 80° C., ethylene oxide was introduced into the reactor, and the feeding amount was 20 mol. At this time, the pressure of the reaction kettle was 0.4MPa. When the temperature of the kettle reached 95°C and the pressure of the kettle was 0.2MPa, the heating was stopped, and then 45mol ethylene oxide was slowly introduced to control the temperature in the kettle not to exceed 120°C. Put them all into the kettle, keep the polymerization reaction in the kettle for 150min, control the reaction temperature at 90°C to carry out the aging reaction for 1 hour after the polymerization reaction is completed, and then discharge the material after the pressure drop of the kettle is zero, and the obtained polyether has a weight average ...

Embodiment 2

[0067] The preparation of embodiment 2 polyether esters

[0068] First, 1mol of diethylenetriamine was introduced into the reaction kettle, and 3.0g of KOH was added as a catalyst, and N 2 After the replacement, the reactor was heated, and when the temperature of the reactor was raised to 75° C., propylene oxide was introduced into the reactor, and the amount of feed was 12 mol. At this time, the pressure of the reaction kettle is 0.4MPa. When the temperature of the kettle reaches 100°C and the pressure of the kettle is 0.2MPa, stop heating, and then slowly feed 60mol propylene oxide to control the temperature in the kettle not to exceed 125°C. Put it into the kettle, keep the polymerization reaction in the kettle for 120min, after the polymerization reaction is completed, control the reaction temperature at 90°C to carry out the aging reaction for 1 hour, and then discharge the material after the pressure drop of the kettle is zero, and the obtained polyether has a molecular ...

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Abstract

The invention provides polyether ester, a preparation method thereof, a polycarboxylic acid type cement grinding aid prepared from the polyether ester, and a preparation method of the polycarboxylic acid type cement grinding aid. The polyether ester has a structure shown as a formula I, wherein R1 is selected from one or more of an ethylenediamine group, a triethanolamine group, a triisopropanolamine group, a diethylenetriamine group and a triethylenetetramine group, R2 is selected from one or more of -CH2CH2O- , -CH(CH3)CH2O- and -CH2CH(CH3)O-, R3 is hydrogen or carboxyl, and n is an integerfrom 5 to 200. The polycarboxylic acid cement grinding aid has high adaptability, wherein the molecular structure can contain various functional groups, so that the controllability of cement particledispersion and cement hydration processes is realized, the sensitivity to raw materials is reduced, and the compounding of the functions of the grinding aid and a water reducing agent achieved; the preparation process is simple, benzene substances are not contained, and the polycarboxylic acid cement grinding aid is efficient and environment-friendly.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a polyether ester and a preparation method thereof, as well as a polycarboxylate cement grinding aid prepared from the polyether ester and a preparation method thereof. Background technique [0002] Cement grinding aid is an important cement process admixture, not only to improve the grinding effect of the mill and the powder selection efficiency of the powder separator during cement clinker grinding, reduce energy consumption, but also significantly increase the output of cement table, The strength of cement at different ages, and give the cement a certain fluidity. The cement produced by adding grinding aids has a lower tendency of compaction and coalescence, which is beneficial to the loading and unloading of cement and reduces the phenomenon of cement silos hanging on the wall. As a chemical additive, cement grinding aid can reduce the viscosity of the mineral material and promote the...

Claims

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Application Information

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IPC IPC(8): C08G65/332C08G65/28C04B24/32C04B103/52
CPCC08G65/3328C08G65/2624C04B24/32C04B2103/52
Inventor 朱建民刘兆滨董振鹏张洪林顾晓华刘枫俞欢
Owner JIANGSU OXIRANCHEM CO LTD