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A kind of preparation method of low sensitive copolymer dispersant

A copolymer and low-sensitivity technology, applied in the field of concrete admixtures, can solve problems such as harsh conditions, performance differences, and difficult control, and achieve the effects of easy control of conditions, excellent comprehensive performance, and improved workability

Active Publication Date: 2018-09-07
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some problems in the polycarboxylate superplasticizer currently used in the market: (1) Insufficient slump retention in high temperature environment; (2) Sensitive to the dosage, when the dosage fluctuates, the performance is very different; (3) Sand The silt content of stone aggregates is highly sensitive
However, the current production of amide type water reducing agent is difficult and the cost is relatively high
[0004] CN 102515619 A discloses a polyetheramine-modified polycarboxylic acid-based water reducer and its preparation method. The technical proposal is based on 5.0% to 50.0% by weight of carboxylic acid-based structural unit I and carboxylic acid-based structural unit II. Polycarboxylic acid copolymer with a weight average molecular weight of 1,000-30,000 and polyetheramine monomer A are amidated at 80°C to 200°C to obtain a polyetheramine-modified polycarboxylic acid copolymer with a weight average molecular weight of 5,000-120,000 , the water reducer has good adaptability, but the acylation rate of the product is difficult to guarantee, which affects the number of grafted polyetheramine side chains in the molecular structure of the product, and then affects the comprehensive performance of the product such as water reducing rate
CN 104031216 A discloses a polyether-amide type polycarboxylic acid high-efficiency water reducer and its preparation method. In the technical scheme, polyetheramine monomers are first obtained by reacting polyetheramines with acid chloride monomers, and then polyoxyethylene ethers are added The monomer and carboxyl monomer are obtained by free radical copolymerization in aqueous solution under the condition of initiator and chain transfer agent. Conditions are harsh and difficult to control

Method used

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  • A kind of preparation method of low sensitive copolymer dispersant
  • A kind of preparation method of low sensitive copolymer dispersant

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of the first copolymer: Weigh 150 g of TPEG with a number average molecular weight of 4000, add it into a four-necked flask together with 200 g of water, and keep the temperature at 50° C. Add dropwise ammonium persulfate aqueous solution (1.5g ammonium persulfate+20g water), thioglycolic acid aqueous solution (1.2g thioglycolic acid+20g water), acrylic acid aqueous solution (17g acrylic acid+20g water), dropwise time is 3.5 hours, dropwise After the end, keep warm for 1.0 hours. The temperature was lowered to 40° C., and the pH value was adjusted in the range of 6.0 to 7.0 with sodium hydroxide to obtain a light yellow clear solution with a concentration of about 40%, which was the first copolymer.

[0023] (2) Preparation of the second copolymer: 3g of polyacrylic acid with a number average molecular weight of 300, 50g of polyetheramine with a number average molecular weight of 1000, 150g of HPEG with a number average molecular weight of 3000 and 5g of...

Embodiment 2

[0026] (1) Preparation of the first copolymer: Weigh 150 g of HPEG with a number-average molecular weight of 4000, add it into a four-neck flask together with 200 g of water, keep the temperature at 45° C., and add the aqueous solution (0.75 g of hydrogen peroxide + 25 g of water) dropwise respectively. ), the aqueous solution of dodecyl mercaptan (1.05g dodecyl mercaptan+25g water), the aqueous solution of methacrylic acid (20g methacrylic acid+20g water), the time of adding is 4 hours, and after the end of dropping, the insulation After 1.5 hours, the temperature was lowered to 40° C., and the pH value was adjusted in the range of 6.0 to 7.0 with ammonia water. A light yellow clear solution with a concentration of about 40% was obtained, which was the first copolymer.

[0027] (2) Preparation of the second copolymer: 4g of polyacrylic acid with a number average molecular weight of 400, 100g of polyetheramine with a number average molecular weight of 2000, 120g of TPEG with a...

Embodiment 3

[0030] (1) Preparation of the first copolymer: Weigh 150 g of HPEG with a number-average molecular weight of 3000, add it into a four-necked flask together with 200 g of water, keep the temperature at 55° C., and add dropwise an aqueous solution of sodium azobisisobutamidine hydrochloride (1.0 g azobisisobutyrosulfide sodium hydrochloride+20g water), 3-mercaptopropionic acid aqueous solution (1.25g3-mercaptopropionic acid+20g water), acrylic acid aqueous solution (20g acrylic acid+20g water), the dropping time is 3.5 hours, After the dropwise addition, the temperature was kept for 1.5 hours. The temperature was lowered to 40° C., and the pH value was adjusted in the range of 6.0 to 7.0 with a mixed solution of ammonia water and potassium hydroxide. A light yellow clear solution with a concentration of about 40% was obtained, which was the first copolymer.

[0031] (2) Preparation of the second copolymer: 6g number average molecular weight is 600 polyacrylic acid, 125g number ...

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Abstract

The invention discloses a method for preparing low-sensitivity copolymer dispersing agents. The method includes steps of (1), adding unsaturated polyether and water into a reaction vessel together, sequentially adding initiators, chain transfer agents and unsaturated acid aqueous solution into the reaction vessel drop by drop and preserving heat for 1.5-4 hours after the initiators, the chain transfer agents and the unsaturated acid aqueous solution are completely added into the reaction vessel drop by drop so as to obtain reaction products with the concentration of 35-45%; (2), adding polyacrylic acid, polyether amine, the unsaturated polyether and catalysts into the reaction vessel, and carrying out constant-temperature reaction at the temperature of 130-180 DEG C for 2-5 hours to obtain second copolymers; (3), weighing first copolymers, the second copolymers and regulating auxiliaries and uniformly mixing the first copolymers, the second copolymers and the regulating auxiliaries with one another according to a mass ratio of 60-90:10-40:0.5-1 to obtain the low-sensitivity copolymer dispersing agents. The method has the advantages that the low-sensitivity copolymer dispersing agents are low in sensitivity to mixing amounts and concrete materials, can be applied to concrete and are excellent in comprehensive performance; the method includes simple processes, conditions are easy to control, the low-sensitivity copolymer dispersing agents are stable in performance, environmental pollution organic solvents are omitted during production, accordingly, the low-sensitivity copolymer dispersing agents are green and environment-friendly water-soluble macromolecules, and industrial production can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a low-sensitivity copolymer dispersant. Background technique [0002] Polycarboxylate high-performance water reducer has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. It has become a research hotspot and development focus in the field of concrete admixtures. There are some problems in the polycarboxylate superplasticizer currently used in the market: (1) Insufficient slump retention in high temperature environment; (2) Sensitive to the dosage, when the dosage fluctuates, the performance is very different; (3) Sand The clay content of stone aggregates is highly sensitive. [0003] Therefore, a low-sensitivity polycarboxylate superplasticizer with superior performance and better general adaptability to materials is urgently needed to be d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28C04B24/26C08F283/06C08F220/06C08G81/02C04B103/40
CPCC04B24/2647C04B24/28C04B40/0039C04B2103/408C08F283/065C08G81/025C04B24/124C04B22/14C04B24/126C08F220/06
Inventor 林艳梅方云辉赖广兴赖华珍
Owner KZJ NEW MATERIALS GROUP CO LTD