Preparation method of polycarboxylic acid water reducing agent compound

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of polycarboxylate water reducer compound, to achieve the effect of improving compoundability, improving function, and improving internal plastic protection function

Inactive Publication Date: 2011-11-16
宋玉军
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, using lignin as the basic raw material to develop high-efficiency or high-performance water-reducing agents compatible with high-efficiency water-reducing agents will have greater economic and environmental benefits, but so far there has been no improvement in improving lignin through appropriate modification. While its dosage in high-efficiency (such as naphthalenesulfonate-based water-reducers) or high-performance water-reducers

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  • Preparation method of polycarboxylic acid water reducing agent compound
  • Preparation method of polycarboxylic acid water reducing agent compound
  • Preparation method of polycarboxylic acid water reducing agent compound

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preparation example Construction

[0046] The preparation method of a kind of polycarboxylate water-reducer compound agent that the present invention proposes, such as figure 1 As shown, the preparation process of carrying out the grafting modification reaction first, and then carrying out the oxidative chain scission reaction specifically includes the following steps:

[0047] Step 1: Prepare lignin solution:

[0048] Weigh 1000g of lignin with a purity greater than or equal to 60% and place it in a reaction vessel, add 429-9000mL of water, and stir to completely dissolve the lignin in the water to form a lignin solution.

[0049] The lignin is preferably alkaline lignin, hydrochloric acid lignin, acid lignin, Larsen lignin, high-purity lignin prepared by solvent extraction, steam cracking lignin, milling lignin , 1,4-dioxane lignin or lignosulfonate.

[0050] Step 2: heating the reaction vessel in a water bath to react:

[0051] (1) Carry out graft modification reaction:

[0052] When the temperature of ...

Embodiment 1

[0080] In this example, the preparation method of the polycarboxylate-based water-reducer compounding agent that first undergoes the graft modification reaction and then undergoes the oxidative chain scission reaction, specifically includes the following steps:

[0081] Step 1: Prepare lignin solution:

[0082] Weigh 1000g of alkaline lignin with a purity equal to 60% and place it in a reaction vessel, add 1000mL of water and stir to completely dissolve the lignin in the water to form a lignin solution.

[0083] Step 2: heating the reaction vessel in a water bath to react:

[0084] (1) Carry out graft modification reaction:

[0085] When the temperature of the lignin solution in the reaction vessel is raised to 70°C, slowly add a mass of 20g active monomer—propylene oxide and 500g oligomer allyl polyethylene glycol (APEG) into the reaction vessel Molecular weight is 600, then adding the initiator ammonium persulfate (NH 4 ) 2 S 2 o 8 , and continue to insulate and react ...

Embodiment 2

[0097] In this example, the oxidative chain scission reaction is carried out first, and then the graft modification reaction is carried out. The specific preparation method of the polycarboxylate water reducer compound includes the following steps:

[0098] Step 1: Prepare lignin solution:

[0099] 1000g of alkaline lignin with a purity of 60% was weighed and placed in a reaction vessel, 2000mL of water was added and stirred to completely dissolve the lignin in the water to form a lignin solution.

[0100] Step 2: heating the reaction vessel in a water bath to react:

[0101] (1) Carry out oxidative chain scission reaction:

[0102] The solution temperature of the lignin solution in the reaction vessel is maintained at 80° C., and the compressed air and the composite catalyst solution whose flow rate is 60 mL / min are passed into the reaction vessel, and the addition amount of the composite catalyst solution meets the catalytic effect in the composite catalyst. The concentrat...

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Abstract

The invention proposes a preparation method of a polycarboxylic acid water reducing agent compound. The preparation method comprises the following steps: (1) preparing a lignin solution; (2) heating a reaction vessel in a water bath for graft modification and catalytic oxidation chain scission reaction regardless of sequence; (3) carrying out sulfonation reaction; and (4) carrying out amino blocking. The preparation method of the poly(carbolic acid) water reducing agent compound provided by the invention can be used for not only reducing the retardation and other defects of the traditional lignin water reducing agent, but also improving the water reduction rate, improving the compatibility with other polycarboxylic acids, simultaneously improving the performance of the polycarboxylic acid, overcoming the defect of the single use of the pure polycarboxylic acid, and improving the impurity sensitivity, bleeding property, workability, slump keeping property and the like of concrete components.

Description

technical field [0001] The invention belongs to the technical field of preparation of concrete admixtures, and in particular relates to a preparation method of a polycarboxylic acid-based water reducer compound. Background technique [0002] With the rapid development of building construction technology, admixtures have become an indispensable component in concrete besides cement, sand, stone and water. Water-reducing agent is one of the most widely used concrete admixtures. When added to concrete, it can adsorb and disperse cement particles, release the water contained in cement aggregates, and enhance the lubricating effect between cement particles. The rate of transformation can be changed, thereby improving the workability of concrete, increasing the strength and compactness of concrete, etc. With the rapid promotion of high-performance, high-fluidity concrete and commercial concrete, the use of high-efficiency and high-performance water reducers plays an irreplaceable ...

Claims

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Application Information

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IPC IPC(8): C08G65/338C08G65/28C08G81/00C08G81/02C08H7/00C08F289/00C08F8/50C08F8/36C08F8/32C04B24/18C04B103/30
Inventor 宋玉军
Owner 宋玉军
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