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Low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer, preparation method and application thereof

A technology of superplasticizer and polycarboxylic acid, which is applied in the field of low retardation hyperbranched polycarboxylic acid superplasticizer and its preparation, can solve the problems of low conversion rate of esterification, high dosage of admixtures, difficult preparation and the like , to achieve the effect of cement adaptive viscosity reduction, excellent dispersion performance and less molecular entanglement

Active Publication Date: 2017-05-17
国科广化(南雄)新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can also effectively shorten the setting time of concrete, but polyacrylic acid needs to be synthesized first, which is difficult to prepare and has high cost; secondly, the viscosity is relatively high, and the conversion rate of esterification with polyether is relatively low, so the amount of admixture is relatively low. high, low price

Method used

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  • Low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer, preparation method and application thereof
  • Low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer, preparation method and application thereof
  • Low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 76.1g of water and 73.8g of A-1 successively into a 250mL four-neck flask equipped with a stirrer, thermometer, nitrogen inlet tube, and dropping device, heat up to 85°C under the protection of nitrogen, and add 1.6g of C-1 after stirring evenly. 1. Stir for another 10 minutes, add 5.5g B-1, 0.01g D-1, and 0.52g E-1 aqueous solution dropwise, the dropwise addition time is 2h and 2.5h respectively, keep warm for 1.5h after the dropwise addition, and the reaction is over Afterwards, the temperature was slowly lowered to 40° C., and the pH value of the obtained product was adjusted to about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding hyperbranched polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-1.

Embodiment 2

[0047] Add 78.1g of water and 71.7g of A-2 to a 250mL four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet tube, and a dropping device, and raise the temperature to 65°C under the protection of nitrogen. After stirring evenly, add 0.3g of C- 1. Stir for another 10 minutes, add 6.5g B-1, 1.2g B-2 and 0.01g D-1, 0.48g E-1 aqueous solution dropwise respectively, the dropping time is 2.5h and 3h respectively, keep warm after the dropping is completed After reacting for 1.5 hours, after the reaction was completed, the temperature was slowly lowered to 40° C., and the obtained product was adjusted to a pH value of about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding hyperbranched polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-2.

Embodiment 3

[0049] Add 76.1g of water and 73.8g of A-1 to a 250mL four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet tube, and a dropping device, and raise the temperature to 25°C under the protection of nitrogen. After stirring evenly, add 0.52g of C-1 2. Stir for another 10 minutes, add 5.5g B-1, 0.20g D-2, and 0.64g E-1 aqueous solution dropwise, the dropping time is 3.5h and 4h respectively, keep warm for 1h after the dropwise addition, after the reaction , the obtained product is adjusted to a pH value of about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding hyperbranched polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-3.

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Abstract

The invention belongs to the field of a super-plasticizer and discloses a low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer, a preparation method and application thereof. The preparation method comprises the following steps: adding polyether macro-monomer, an initiator and water into a reactor; under the nitrogen protection, stirring and mixing uniformly, and meanwhile, heating to 10-100 DEG C; respectively dropwise adding a micro-molecule monomer, a reducing agent and an aqueous solution of a chain transfer agent; after the ending of the dropwise adding, keeping the temperature and reacting for 1-6h and neutralizing, thereby acquiring the low and slow coagulating hyperbranched polycarboxylic acid super-plasticizer. The chain transfer agent is selected from at least one of tri-mercaptoacetic trimethylolpropane ester, pentaerythritol tetrakis and dipentaerythritol hexakis(3-mercaptopropionate). According to the invention, a special chain transfer agent is used and three or more ester groups are introduced into the central position of a main chain, so that the acquired product has a hyperbranched structure. The super-plasticizer has the advantages of high hydration speed, short coagulating time and high initial strength when being applied.

Description

technical field [0001] The invention belongs to the field of superplasticizers, and in particular relates to a low-retardation hyperbranched polycarboxylic acid superplasticizer and its preparation method and application. Background technique [0002] Polycarboxylic acid-based high-performance water reducer has the function of adsorbing on positively charged particles to inhibit particle aggregation. Therefore, it is widely used in the fields of ceramics, cement and gypsum products. The hyperbranched polymer molecule has a compact structure similar to a sphere, the hydrodynamic radius of gyration is small, and the molecular chains are less entangled. Therefore, polycarboxylic acid superplasticizers with new structures such as star structures and hyperbranched structures have excellent dispersion properties, The cement has the advantages of good adaptability and viscosity reduction. [0003] In the production process of traditional precast concrete components, in order to s...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F220/58C08F2/38C04B24/26C04B24/16C04B28/00C04B28/14C04B35/634C04B103/32
CPCC04B24/165C04B24/2605C04B24/2658C04B28/00C04B28/14C04B35/63404C04B35/63444C04B2103/32C08F2/38C08F283/065C08F220/06
Inventor 黄健恒庞浩廖兵年福伟
Owner 国科广化(南雄)新材料研究院有限公司
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