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Polyaspartic-acid-containing architectural retarder and preparation method thereof

A polyaspartic acid, construction technology, applied in the field of construction retarders, can solve the problems of concrete segregation and bleeding, mildew of concrete water reducer, affecting the storage time of concrete water reducer, etc., and achieves significant progress, The effect of highlighting substantive features

Inactive Publication Date: 2017-01-04
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing retarder has low retarding efficiency and large dosage, which may cause segregation and bleeding of concrete in the city, which will have a negative impact on the strength of the cured concrete
In addition, the addition of polyhydroxy compounds can easily lead to mildew of the compounded concrete water-reducer, which affects the storage time of the compounded concrete water-reducer and increases storage costs

Method used

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  • Polyaspartic-acid-containing architectural retarder and preparation method thereof

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preparation example Construction

[0023] In the first aspect, the present invention provides a method for preparing a construction retarder containing polyaspartic acid, comprising the following steps:

[0024] (1) In the present invention, polyaspartic acid and unsaturated alcohol compounds are esterified under acidic catalytic conditions to synthesize polymer molecules with copolymerization reaction.

[0025] Fully dissolve polyaspartic acid in unsaturated alcohol compounds, mechanically stir at room temperature, and feed HCl gas, and add polymerization inhibitor. Stir the reaction for 30min~120min, then heat and reflux for 30min~60min, and evaporate the water and excess unsaturated enol compounds generated by the reaction under reduced pressure to obtain a polyaspartic acid compound containing unsaturated double bonds.

[0026] (2) Mechanically mix the polyaspartic acid compound containing unsaturated double bond structure synthesized in step (1) with unsaturated carboxylic acid and unsaturated sulfonic aci...

Embodiment 1

[0029] Fully dissolve 3000g of polyaspartic acid with a number average molecular weight of 3000 in 60g of acrylic acid, mechanically stir at room temperature, continuously feed HCl gas at a rate of 100ml / min, add 0.5g of hydroquinone as Polymerization inhibitor. Stir the reaction for 60 minutes, heat and reflux for 45 minutes at 70°C, evaporate the water and excess propenyl alcohol generated by the reaction under reduced pressure at 0.2 times the standard atmospheric pressure and 70°C to obtain polyaspartic acid containing unsaturated double bonds compound.

[0030] Mechanically mix 1000g of the polyaspartic acid compound containing unsaturated double bond structure synthesized above with 150g of methacrylic acid and 50g of sodium methacrylate sulfonate, and add 20g of ammonium persulfate as an initiator. carry out the copolymerization reaction. After the reaction, deionized water was added to adjust the reactant concentration to 30%.

Embodiment 2

[0032] Fully dissolve 4000g of polyaspartic acid with a number average molecular weight of 4000 in 65g of methacrylic acid, mechanically stir at room temperature, continuously feed HCl gas at a rate of 80ml / min, add 0.5g of terephthalic acid Phenol as a polymerization inhibitor. Stir the reaction for 70 minutes, heat and reflux at 65°C for 50 minutes, and evaporate the water and excess methacryl alcohol generated by the reaction under reduced pressure at 0.2 times the standard atmospheric pressure and 75°C to obtain polyaspartic acid containing unsaturated double bonds. amino acid compound.

[0033] Mechanically mix 1000g of polyaspartic acid compound containing unsaturated double bond structure synthesized above with 120g of methacrylic acid and 40g of sodium propylene sulfonate, add 25g of sodium persulfate as an initiator, and carry out copolymerization at 60°C reaction. After the reaction, deionized water was added to adjust the reactant concentration to 30%.

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Abstract

The invention provides a polyaspartic-acid-containing architectural retarder and a preparation method thereof. The preparation method comprises the following steps: carrying out esterification reaction on polyaspartic acid and unsaturated alcohol, and carrying out copolymerization reaction on the esterification reaction product, unsaturated carboxylic acid, unsaturated sulfonic acid and the like to obtain the architectural retarder. The architectural retarder has the aspartic acid structure, and thus, can lower the calcium ion concentration in the concrete system and inhibit the ettringite structure from formation, thereby achieving the effects of setting retarding and plasticity maintaining.

Description

technical field [0001] The invention relates to a building retarder synthesized from polyaspartic acid esterified products. Background technique [0002] Admixtures for construction are widely used in concrete engineering and are one of the main types of construction aids. According to the characteristics and requirements of different concrete construction projects, common admixtures for construction include retarders, early strength agents, plastic retainers, Pumping agent, air-entraining agent, defoamer, etc. [0003] There is a big difference between construction admixture and concrete water reducer (also known as superplasticizer, Superplasticizer). The common types of concrete water reducer are lignosulfonate water reducer, naphthalene water reducer, polycarboxylic Water-reducing agent, etc. The use of concrete water-reducing agent can increase the dispersion of cement particles, so as to prolong the hydration rate of cement mineral components and delay the setting and...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/06C04B24/16
CPCC08F290/06C04B24/163C04B2103/20
Inventor 陶水刚
Owner SHANGHAI TAIJIE CHEM
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