Oxidative degradation starch grafted polycarboxylate water reducer and preparation method thereof

Abstract

The invention belongs to the technical field of cement concrete admixtures, and in particular relates to an oxydative degradation starch grafted polycarboxylate superplasticizer and a preparation method thereof. The invention provides a resource of raw materials for preparing the novel efficient polycarboxylate superplasticizer, namely, natural and degradable starch is introduced to take the place of most part of petrochemical materials, the raw materials are wide and sustainable in resource, and not only is the cost lowered, but also the environment is protected.

Description

technical field

[0001] The invention belongs to the technical field of cement concrete admixtures, and in particular relates to a novel polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique

[0002] In recent years, with the acceleration of urbanization in our country, commercial concrete has become the most widely used building material. As one of the essential "fifth elements" of concrete, the amount of water reducing agent is also increasing year by year. In 2012 alone, the total consumption of water-reducing agents in China exceeded 5 million tons, including naphthalene-based water-reducers, polycarboxylate-based water-reducers, aliphatic water-reducers, sulfamate water-reducers and lignin water-reducers agent etc. Among them, the polycarboxylate high-performance superplasticizer is a concrete superplasticizer (water reducer) with the most advanced technology, the highest technology content, the best application prospe...

Examples

Embodiment 1

[0029] Add 300 parts by mass of water to a reaction kettle connected with an ultrasonic stirrer, and add 100 parts by mass of ordinary cornstarch under the stirring of an ultrasonic stirrer (20KHz, power 2000W). The reactants became a translucent solution. Add 15 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 20 minutes, add dropwise a mixture of 10 parts by mass of acrylamide, 20 parts by mass of acrylic acid and 10 parts by mass of sodium propylene sulfonate while ultrasonically stirring. After the dropwise addition, continue to react for 3 hours , use 40% sodium hydroxide solution to adjust the pH value to 7-8, add water to dilute to a total mass fraction of 20%, and then obtain the oxidatively degraded starch grafted polycarboxylate superplasticizer product.

[0030]The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 1 is subjected to the clean slurry test according to the current national standard. When the dosa...

Embodiment 2

[0032] Add 400 parts by mass of water to the reaction kettle connected with an ultrasonic stirrer, and add 100 parts by mass of wheat starch under the stirring of the ultrasonic stirrer (20KHz, power 2000W). The substance becomes a transparent solution. Add 15 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 20 minutes, dropwise add a mixture of 10 parts by mass of acrylamide, 20 parts by mass of methacrylic acid and 10 parts by mass of sodium methacryl sulfonate while ultrasonically stirring. After the addition is complete, After continuing to react for 3 hours, adjust the pH value to 7-8 with 40% sodium hydroxide solution, add water to dilute to a total mass fraction of 20%, and obtain the oxidatively degraded starch-grafted polycarboxylate superplasticizer product.

[0033] The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 2 is subjected to the clean slurry test according to the current national standard. When the...

Embodiment 3

[0035] In the reaction kettle connected with an ultrasonic stirrer, add 200 parts by mass of water, under the stirring of the ultrasonic stirrer (20KHz, power 2000W), add 100 parts by mass of potato starch, wait for uniform dispersion, gelatinize at 65°C until reaction The substance becomes a transparent solution. Add 10 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 25 minutes, dropwise add a mixture of 10 parts by mass of acrylamide, 20 parts by mass of methacrylic acid and 10 parts by mass of maleic anhydride while ultrasonically stirring, and continue the reaction for 1.5 After h, use 40% sodium hydroxide solution to adjust the pH value to 7-8, add water to dilute to a total mass fraction of 20%, and obtain the oxidatively degraded starch grafted polycarboxylate superplasticizer product.

[0036] The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 3 is subjected to the clean slurry test according to the current n...

technical field

[0001] The invention belongs to the technical field of cement concrete admixtures, and in particular relates to a novel polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique

[0002] In recent years, with the acceleration of urbanization in our country, commercial concrete has become the most widely used building material. As one of the essential "fifth elements" of concrete, the amount of water reducing agent is also increasing year by year. In 2012 alone, the total consumption of water-reducing agents in China exceeded 5 million tons, including naphthalene-based water-reducers, polycarboxylate-based water-reducers, aliphatic water-reducers, sulfamate water-reducers and lignin water-reducers agent etc. Among them, the polycarboxylate high-performance superplasticizer is a concrete superplasticizer (water reducer) with the most advanced technology, the highest technology content, the best application prospe...

Examples

Embodiment 1

[0029] Add 300 parts by mass of water to a reaction kettle connected with an ultrasonic stirrer, and add 100 parts by mass of ordinary cornstarch under the stirring of an ultrasonic stirrer (20KHz, power 2000W). The reactants became a translucent solution. Add 15 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 20 minutes, add dropwise a mixture of 10 parts by mass of acrylamide, 20 parts by mass of acrylic acid and 10 parts by mass of sodium propylene sulfonate while ultrasonically stirring. After the dropwise addition, continue to react for 3 hours , use 40% sodium hydroxide solution to adjust the pH value to 7-8, add water to dilute to a total mass fraction of 20%, and then obtain the oxidatively degraded starch grafted polycarboxylate superplasticizer product.

[0030]The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 1 is subjected to the clean slurry test according to the current national standard. When the dosa...

Embodiment 2

[0032] Add 400 parts by mass of water to the reaction kettle connected with an ultrasonic stirrer, and add 100 parts by mass of wheat starch under the stirring of the ultrasonic stirrer (20KHz, power 2000W). The substance becomes a transparent solution. Add 15 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 20 minutes, dropwise add a mixture of 10 parts by mass of acrylamide, 20 parts by mass of methacrylic acid and 10 parts by mass of sodium methacryl sulfonate while ultrasonically stirring. After the addition is complete, After continuing to react for 3 hours, adjust the pH value to 7-8 with 40% sodium hydroxide solution, add water to dilute to a total mass fraction of 20%, and obtain the oxidatively degraded starch-grafted polycarboxylate superplasticizer product.

[0033] The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 2 is subjected to the clean slurry test according to the current national standard. When the...

Embodiment 3

[0035] In the reaction kettle connected with an ultrasonic stirrer, add 200 parts by mass of water, under the stirring of the ultrasonic stirrer (20KHz, power 2000W), add 100 parts by mass of potato starch, wait for uniform dispersion, gelatinize at 65°C until reaction The substance becomes a transparent solution. Add 10 parts by mass of hydrogen peroxide, and after ultrasonic stirring for 25 minutes, dropwise add a mixture of 10 parts by mass of acrylamide, 20 parts by mass of methacrylic acid and 10 parts by mass of maleic anhydride while ultrasonically stirring, and continue the reaction for 1.5 After h, use 40% sodium hydroxide solution to adjust the pH value to 7-8, add water to dilute to a total mass fraction of 20%, and obtain the oxidatively degraded starch grafted polycarboxylate superplasticizer product.

[0036] The oxidative degradation starch grafted polycarboxylate superplasticizer made in Example 3 is subjected to the clean slurry test according to the current n...

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