A kind of macromonomer and the method for preparing polycarboxylate water reducer with it

A technology of large monomer and water reducer, which is applied in the field of polycarboxylate water reducer, can solve the problems of slow technology update, few types of large monomer, unfavorable development, etc., and achieve low cost, outstanding steric hindrance, and maintenance good collapsibility effect

Active Publication Date: 2021-07-27
北京砼帮汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic polycarboxylic acid macromonomers have been promoted for more than ten years, but there are problems such as few types of macromonomers and slow technological updates, which are not conducive to the further development of the industry

Method used

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  • A kind of macromonomer and the method for preparing polycarboxylate water reducer with it
  • A kind of macromonomer and the method for preparing polycarboxylate water reducer with it
  • A kind of macromonomer and the method for preparing polycarboxylate water reducer with it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The application discloses a method for preparing a large order, which comprises the following steps:

[0049] Step 1: Preparation of prepolymer

[0050] Add initiator vinyl glycol ether 10 moles (880g) in reactor, catalyst sodium hydride 2.77g (0.09% of material total amount) mix; Add 50 moles (2200g) of oxyethane again, the Internally adjust the temperature to 110°C for ring-opening polymerization. The pressure in the reactor is controlled at 0-0.45MPa until the pressure in the reactor is constant and then stabilizes for 15-30 minutes. Cool down to 65-80°C to remove unreacted ethylene oxide. ; Obtaining number average molecular weight is the prepolymer of 308;

[0051] Step 2: Preparation of Macromonomer

[0052] Take 1 mole (308g) of the prepolymer, add 2.68g (ie 2.96g-0.28g) of catalyst sodium hydride according to 0.09% of the supplementary material amount; add 15 moles (660g) of ethylene oxide, and join with the initiator The number of moles of ethylene oxide in ...

Embodiment 1～13

[0059] Embodiments 1 to 13 are the process control conditions for preparing macromonomers (see Table 1)

[0060] Table 1:

[0061]

[0062]

[0063] In the present invention, when the number-average molecular weight of the macromonomer exceeds 9554, it can be realized in the existing industry, but there is a decrease in production efficiency, an increase in viscosity, and a corresponding increase in cost, which has no practical significance in application.

Embodiment J

[0068] Embodiment JS_1~JS_13

[0069] This group of examples is an example of the method of preparing polycarboxylate water reducer with macromonomer in the present invention (free radical copolymerization reaction in redox system).

[0070] The principle of synthesizing polycarboxylate superplasticizer by oxidation-reduction system is to generate free radicals through oxidation-reduction reaction. First add oxidant substances to the system, and then drop the reducing agent to undergo oxidation-reduction reaction with the oxidant in the solution, and generate free radicals to initiate monomer polymerization. Synthetic water reducer.

[0071] The application discloses a method for preparing a polycarboxylate water reducer using a macromonomer, which comprises the following steps:

[0072] Add a part of water into the reaction kettle, add the macromonomer in the example, stir and dissolve; add the aqueous solution of b dropwise while adding the oxidant, the dropping time is 24-...

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Abstract

The invention discloses a macromonomer and a method for preparing a polycarboxylate water-reducer by using it. The preparation of the macromonomer includes adding an initiator or its polyoxyethylene ether prepolymer, adding a catalyst, and alternately adding epoxy Ethane and propylene oxide undergo ring-opening polymerization; the ring-opening polymerization temperature of ethylene oxide is 100-130°C; the ring-opening polymerization temperature of propylene oxide is 115-150°C, and the polyoxygen containing the starting unit Polymerized macromonomer with alternating segments of vinyl ether and polyoxypropylene ether; the number of moles of a single segment of polyoxyethylene ether is 20 to 60, the number of moles of a single segment of polyoxypropylene ether is 1 to 10, polycarboxylic acid Preparation of water reducer: Carry out free radical copolymerization reaction with redox system, drop monomer b and auxiliary agent into macromonomer and tank bottom water, trigger free radical polymerization reaction to obtain polycarboxylate water reducer, this product The water reducing rate can reach 25%-50%, the mixing amount is low, the cost of concrete is low, and the effect of slump retention is better.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a macromonomer and a method for preparing polycarboxylate water reducer using it. Background technique [0002] Polycarboxylate superplasticizer is formed by the copolymerization of active macromonomers and various active small monomers. The macromonomer provides a polymerizable active double bond in the molecular structure, and its long chain structure provides a strong steric hindrance for the water reducing agent. Domestic polycarboxylic acid macromonomers have been promoted for more than ten years, but there are problems such as few types of macromonomers and slow technological updates, which are not conducive to the further development of the industry. The present invention aims to innovate the polycarboxylic acid macromonomer from the aspects of improving the reactivity of the polycarboxylic acid macromonomer, improving the side chain structure and in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08F283/06C08F220/20C08F2/38C08F4/40C04B24/26C04B103/30
CPCC04B2103/302C08F2/38C08F4/40C08F283/065C08G65/2609C08F220/20
Inventor 黎思幸李树亮
Owner 北京砼帮汇科技有限公司
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