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Polycarboxylic acid building admixture containing phenyl structure and synthetic method of polycarboxylic acid building admixture

A synthesis method and admixture technology, applied in the field of construction admixtures, can solve the problems affecting the synthesis of polycarboxylic acid admixtures, low copolymerization reaction activity, etc., and achieve the effect of high initial water reducing rate and slow setting and slump preservation performance

Active Publication Date: 2017-05-31
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a polycarboxylic acid construction admixture containing a phenyl structure and a synthesis method thereof, which solves the problem that the double bond structure of maleic anhydride in the prior art has low copolymerization reactivity and affects polycarboxylates. Technical Problems of Synthesis of Acid Construction Admixture

Method used

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  • Polycarboxylic acid building admixture containing phenyl structure and synthetic method of polycarboxylic acid building admixture
  • Polycarboxylic acid building admixture containing phenyl structure and synthetic method of polycarboxylic acid building admixture
  • Polycarboxylic acid building admixture containing phenyl structure and synthetic method of polycarboxylic acid building admixture

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Experimental program
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Effect test

Embodiment 1

[0024] Step 1, add 1000g of dry maleic anhydride in the three-necked flask, add 1000g of dry benzyl alcohol in the reaction vessel, and the stirring device rotates quickly to make the reaction system uniform and the heat generated by the reaction to dissipate rapidly, drop the time for 30min, continue After 15 minutes, the reaction product was an esterification product of benzyl alcohol with a double bond.

[0025] Step 2: Add 500 g of the benzyl alcohol esterification product prepared in step 1 to a three-necked flask, mechanically stir at a reaction temperature of 70° C., add 15 g of sodium persulfate as an initiator, and add 800 g of methacrylic acid dropwise at a constant rate for a time of After 45 minutes, the reaction was stopped to obtain a polymer product with a lower degree of polymerization.

[0026] Step 3: Add 100 g of the phenyl-containing oligomer prepared in Step 2 into a three-necked flask, add 1,500 g of HPEG unsaturated polyether monomers with a number avera...

Embodiment 2

[0029] Step 1, add 1000g of dry maleic anhydride in the three-necked flask, add 1200g of dry phenylethyl alcohol in the reaction vessel, the stirring device rotates quickly to make the reaction system uniform and the heat generated by the reaction to dissipate rapidly, dropwise for 35min, continue After 20 minutes, the reaction product was an esterification product of phenylethyl alcohol with a double bond.

[0030] Step 2: Add 500 g of the phenylethyl alcohol esterification product prepared in Step 1 into a three-necked flask, mechanically stir at a reaction temperature of 75° C., add 20 g of potassium persulfate as an initiator, and add 750 g of acrylic acid dropwise at a constant rate for 60 minutes. The reaction was stopped to obtain a polymer product with a lower degree of polymerization.

[0031] Step 3, add 100 g of the phenyl-containing oligomer prepared in step 2 into a three-necked flask, add 1200 g of TPEG unsaturated polyether monomers with a number average molecular...

Embodiment 3

[0034] Step 1, add 1000g of dry maleic anhydride in the three-necked flask, add 1250g of dry phenylpropanol in the reaction vessel, and the stirring device rotates quickly to make the reaction system uniform and the heat generated by the reaction to dissipate rapidly, and the dropwise addition time is 30min. Continued for 10 minutes, the reaction product was the esterification product of phenylpropanol with double bond.

[0035] Step 2, add 500 g of the phenylpropanol esterification product prepared in step 1 to the three-necked flask, mechanically stir at a reaction temperature of 80 ° C, add 25 g of potassium persulfate as an initiator, and add 750 g of methacrylic acid dropwise at a constant rate, and the dropping time After 30 min, the reaction was stopped to obtain a polymer product with a lower degree of polymerization.

[0036] Step 3: Add 100 g of the phenyl-containing oligomer prepared in Step 2 into a three-necked flask, add 900 g of APEG-based unsaturated polyether ...

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Abstract

The invention discloses a polycarboxylic acid building admixture containing a phenyl structure. A molecular structural formula I of the admixture is shown in the description; in the formula I, the sum of a and b is greater than 0 and smaller than or equal to 200, the sum of c and d is greater than 0 and smaller than or equal to 200 and e is greater than 0 and smaller than or equal to 100; n is greater than 0 and smaller than or equal to 300; m is 1, 2 or 3; R1 is straight-chain polyethylene glycol; a molecular structural formula II of the R1 is shown in the description; in the formula II, n is greater than 10 and smaller than 90; the R2 is straight-chain polyethylene glycol monomethyl ether; a molecular structural formula III of the R2 is shown in the description; in the formula III, n is greater than 10 and smaller than 90; the R3 is at least one of -H or -Na; R4 is at least one of -H or -CH3. According to the polycarboxylic acid building admixture disclosed by the invention, a maleic anhydride esterification product containing the phenyl and unsaturated carboxylic acid undergo polymerization reaction to synthesize a low molecular weight polymer; the technical problem of low reaction activity of a maleic anhydride structure is overcome; the polycarboxylic acid building admixture containing the phenyl structure is synthesized; compared with the prior art, the building admixture has the advantages of higher initial water reducing rate and delayed coagulation and slump retaining properties.

Description

technical field [0001] The invention belongs to the field of building admixtures, in particular to a polycarboxylic acid building admixture containing a phenyl structure and a synthesis method thereof. Background technique [0002] Polycarboxylate construction admixture, also known as superplasticizer (Polycarboxylate Superplasticizer), belongs to the third generation construction admixture. In pumping construction projects, polycarboxylate superplasticizer has become one of the indispensable concrete admixtures. Kao Corporation of Japan first applied for a patent in the 1980s. After more than ten years of development, it has gradually replaced traditional naphthalene-based water reducers and lignin-based water reducers. The article on the properties of polycarboxylate superplasticizers published by Japanese scholars in 1985 is the earliest document on the synthesis method of polycarboxylate superplasticizers. This document studies the use of carboxylic acid-based reactive ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/14C08F222/16C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F222/14C08F222/16
Inventor 冯波朱伟亮吴德龙李晓庭姚燕杰
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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