Esterification product for preparing water reducing agent, preparation method of esterification product, shrinkage-reducing ether polycarboxylate water reducing agent and preparation method of shrinkage-reducing ether polycarboxylate water reducing agent

Abstract

The invention relates to the technical field of building additives, in particular to an esterification product for preparing a water reducing agent, a preparation method thereof, a shrinkage-reducing ether polycarboxylate water reducing agent and a preparation method of the shrinkage-reducing ether polycarboxylate water reducing agent. The esterification product comprises a monomer with amide and dihydroxy and an unsaturated acid esterification product. According to the shrinkage-reducing ether polycarboxylate superplasticizer prepared from the esterification product, the esterification product is prepared by esterification of coconut diethanolamide and unsaturated acid and has the advantages of low cost and simplicity and convenience in operation, and the prepared esterification product and a shrinkage-reducing functional monomer are subjected to copolymerization reaction, so that the polycarboxylate water reducing agent main chain is provided with amide and other hydrophilic groups and shrinkage reducing groups, the prepared polycarboxylate water reducing agent has lower surface tension, the drying shrinkage of concrete is effectively reduced, the concrete has better dispersity and dispersity retention performance, the internal mechanical property and strength of the concrete are effectively improved, and remarkable effect is achieved.

Description

technical field

[0001] The invention relates to the technical field of building admixtures, in particular to an esterification product used for preparing a water reducer and a preparation method thereof, a shrinkage-reducing ether polycarboxylate water reducer and a preparation method thereof. Background technique

[0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving. It also has the effect of reducing the drying shrinkage of hardened concrete. This multifunctional polycarboxylate ...

Examples

Embodiment 1

[0036] (1) Preparation of esterification products: In parts by weight, add 48.5 parts of fumaric acid and 100 parts of cocoic acid diethanolamide to the first reaction vessel and mix them. Under nitrogen conditions, add 0.75 parts of antimony trioxide, 0.45 parts of Parts of methyl hydroquinone, and adjust the temperature at 110 ° C, react for 5 hours, that is, monomers with amide and double hydroxyl groups and unsaturated esterification products are obtained;

[0037] (2) Copolymerization reaction: in parts by weight, 2 parts of the esterified product obtained in step (1), 50 parts of methallyl alcohol polyoxyethylene ether with a molecular weight of 600 and 50 parts of methyl alkene with a molecular weight of 3000 Propanol polyoxyethylene ether, 0.45 parts of sodium dodecylbenzenesulfonate, 0.9 parts of diethylene glycol monolaurate and 120 parts of water are added to the second reaction vessel and stirred evenly, and 3.5 parts of hydrogen peroxide are mixed with 20 parts of ...

Embodiment 2

[0040] (1) Preparation of esterification product: in parts by weight, 45.2 parts of acrylic acid and 100 parts of coconut acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 2.17 parts of cerium sulfate and 1.16 parts of 4-hydroxyl piperidinol oxygen free radical, and adjust the temperature at 120°C, and react for 6 hours to obtain monomers with amide and double hydroxyl groups and unsaturated esterified products;

[0041] (2) Copolymerization reaction: in parts by weight, 1 part of esterification product obtained in step (1), 50 parts of 600 methallyl alcohol polyoxyethylene ether and 50 parts of methallyl alcohol with a molecular weight of 3000 Polyoxyethylene ether, 0.5 parts of sodium dodecylbenzenesulfonate, 1 part of diethylene glycol monolaurate and 120 parts of water are added to the second reaction vessel and stirred evenly, and 2.8 parts of hydrogen peroxide and 20 parts of water are mixed evenly in In the first dropp...

Embodiment 3

[0044] (1) Preparation of esterification product: in parts by weight, 60.6 parts of fumaric acid and 100 parts of cocoic acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 4 parts of cerium sulfate and 2.4 parts of formazan are added Hydroquinone, and adjust the temperature at 80°C, and react for 5 hours to obtain monomers and unsaturated esterification products with amides and dihydroxy groups;

[0045] (2) Copolymerization reaction: in parts by weight, 3 parts of esterification products obtained in step (1), 50 parts of 600 methallyl alcohol polyoxyethylene ethers and 50 parts of methallyl alcohols with a molecular weight of 3000 Polyoxyethylene ether, 0.3 parts of sodium dodecylbenzenesulfonate, 0.6 parts of diethylene glycol monolaurate and 117 parts of water are added to the second reaction vessel and stirred evenly, and 2.5 parts of hydrogen peroxide and 20 parts of water are mixed evenly in In the first dropping device;...

technical field

[0001] The invention relates to the technical field of building admixtures, in particular to an esterification product used for preparing a water reducer and a preparation method thereof, a shrinkage-reducing ether polycarboxylate water reducer and a preparation method thereof. Background technique

[0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving. It also has the effect of reducing the drying shrinkage of hardened concrete. This multifunctional polycarboxylate ...

Examples

Embodiment 1

[0036] (1) Preparation of esterification products: In parts by weight, add 48.5 parts of fumaric acid and 100 parts of cocoic acid diethanolamide to the first reaction vessel and mix them. Under nitrogen conditions, add 0.75 parts of antimony trioxide, 0.45 parts of Parts of methyl hydroquinone, and adjust the temperature at 110 ° C, react for 5 hours, that is, monomers with amide and double hydroxyl groups and unsaturated esterification products are obtained;

[0037] (2) Copolymerization reaction: in parts by weight, 2 parts of the esterified product obtained in step (1), 50 parts of methallyl alcohol polyoxyethylene ether with a molecular weight of 600 and 50 parts of methyl alkene with a molecular weight of 3000 Propanol polyoxyethylene ether, 0.45 parts of sodium dodecylbenzenesulfonate, 0.9 parts of diethylene glycol monolaurate and 120 parts of water are added to the second reaction vessel and stirred evenly, and 3.5 parts of hydrogen peroxide are mixed with 20 parts of ...

Embodiment 2

[0040] (1) Preparation of esterification product: in parts by weight, 45.2 parts of acrylic acid and 100 parts of coconut acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 2.17 parts of cerium sulfate and 1.16 parts of 4-hydroxyl piperidinol oxygen free radical, and adjust the temperature at 120°C, and react for 6 hours to obtain monomers with amide and double hydroxyl groups and unsaturated esterified products;

[0041] (2) Copolymerization reaction: in parts by weight, 1 part of esterification product obtained in step (1), 50 parts of 600 methallyl alcohol polyoxyethylene ether and 50 parts of methallyl alcohol with a molecular weight of 3000 Polyoxyethylene ether, 0.5 parts of sodium dodecylbenzenesulfonate, 1 part of diethylene glycol monolaurate and 120 parts of water are added to the second reaction vessel and stirred evenly, and 2.8 parts of hydrogen peroxide and 20 parts of water are mixed evenly in In the first dropp...

Embodiment 3

[0044] (1) Preparation of esterification product: in parts by weight, 60.6 parts of fumaric acid and 100 parts of cocoic acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 4 parts of cerium sulfate and 2.4 parts of formazan are added Hydroquinone, and adjust the temperature at 80°C, and react for 5 hours to obtain monomers and unsaturated esterification products with amides and dihydroxy groups;

[0045] (2) Copolymerization reaction: in parts by weight, 3 parts of esterification products obtained in step (1), 50 parts of 600 methallyl alcohol polyoxyethylene ethers and 50 parts of methallyl alcohols with a molecular weight of 3000 Polyoxyethylene ether, 0.3 parts of sodium dodecylbenzenesulfonate, 0.6 parts of diethylene glycol monolaurate and 117 parts of water are added to the second reaction vessel and stirred evenly, and 2.5 parts of hydrogen peroxide and 20 parts of water are mixed evenly in In the first dropping device;...

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