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Low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and preparation method thereof

A low surface tension, polycarboxylate technology, applied in the field of construction admixtures, can solve the problems of small plastic shrinkage of high-strength concrete, insufficient reduction, increase early shrinkage and total shrinkage, etc., to achieve large steric hindrance and prevent shrinkage Effect of cracking and improving dispersion performance

Active Publication Date: 2019-10-22
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of ensuring the same slump of the mixture, different admixtures have obvious effects on the plastic shrinkage and crack resistance of concrete. Naphthalene-based, sulfamate-based and aliphatic-based water reducers all increase the early shrinkage and total Shrinkage, compared with naphthalene-based water reducers and sulfamic acid-based water reducers, high-strength concrete mixed with polycarboxylate water-reducers has less plastic shrinkage and better crack resistance, but the reduction is far from enough, and the shrinkage reduction effect Difficult to compare with shrink reducer

Method used

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  • Low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and preparation method thereof
  • Low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and preparation method thereof
  • Low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of polyphosphate:

[0036] Under nitrogen protection, add 10mol trimethylolpropane to the first reaction device, cool in an ice-water bath for 1h, add 500ml triethylamine, and drop 100ml dichloromethane solution (solution The concentration is 100mol / L), and the dropping time is 1h. After the dropping is completed, the temperature is slowly raised to 45°C for 24h. After standing for 12h, it is filtered with suction, the filtrate is collected, and the solvent is distilled off to obtain polyphosphate.

[0037] (2) Preparation of hyperbranched shrinkage-reducing functional monomer:

[0038] 100g molecular weight is the poly(ethylene glycol monomethyl ether) of 200, 49g maleic anhydride, the polyphosphate ester prepared by 240g step (1), 0.5g FeCl 3 ·6H 2 O and 0.6g of o-tert-butylphenol were added to the second reaction device, and under the protection of nitrogen, they were reacted at a constant temperature of 90° C. for 5 hours to obtain the hyperbranche...

Embodiment 2

[0045] (1) Preparation of polyphosphate:

[0046] Under nitrogen protection, add 10mol trimethylolpropane to the first reaction device, cool in an ice-water bath for 1h, add 500ml triethylamine, and drop 100ml dichloromethane solution (solution The concentration is 100mol / L), and the dropwise addition time is 1h. After the dropwise addition is completed, the temperature is raised slowly to 45°C for 24h. After standing for 12 hours, filter with suction, collect the filtrate, and distill off the solvent to obtain polyphosphate.

[0047] (2) Preparation of hyperbranched shrinkage-reducing functional monomer:

[0048] 100g molecular weight is the poly(ethylene glycol monomethyl ether) of 500, 19.6g maleic anhydride, the polyphosphate ester prepared by 95g step (1), 1g SnCl 2 2H 2 O and 0.8 g of phenothiazine were added to the second reaction device, and under the protection of nitrogen, they were reacted at a constant temperature of 100° C. for 6 hours to obtain the hyperbranch...

Embodiment 3

[0055] (1) Preparation of polyphosphate:

[0056] Under nitrogen protection, add 10mol trimethylolpropane to the first reaction device, cool in an ice-water bath for 1h, add 500ml triethylamine, and drop 100ml dichloromethane solution (solution The concentration is 100mol / L), and the dropwise addition time is 1h. After the dropwise addition is completed, the temperature is raised slowly to 45°C for 24h. After standing overnight, suction was filtered, the filtrate was collected, and the solvent was distilled off to obtain polyphosphate.

[0057] (2) Preparation of hyperbranched shrinkage-reducing functional monomer:

[0058] Polyethylene glycol monomethyl ether, 12.25g maleic anhydride, 60g step (1) prepared polyphosphate, 1.2g NaHSO with 100g molecular weight are 800 4 ·H 2 O and 1.0 g of phenothiazine were added to the second reaction device, and under the protection of nitrogen, they were reacted at a constant temperature of 80° C. for 4 hours to obtain the hyperbranched ...

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Abstract

The invention relates to the technical field of building additives and in particular to a low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and a preparationmethod thereof. The preparation method comprises the following steps: putting an unsaturated polyether, a polyhydroxy polymer and a hyperbranched shrinkage reduction functional monomer and water intoa container, mixing at 20-60 DEG C, adding an initiator solution, a chain transfer agent solution and an unsaturated acid solution, keeping the temperature for a certain time, and adjusting the pH value of the obtained reaction product to 6.0-7.0 by using an alkali substance, thereby obtaining the low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer. As a great amount of the shrinkage reduction functional monomer is introduced into a polycarboxylic acid molecular structure through copolymerization, the polycarboxylic acid molecular structure has a shrinkage reduction function chain segment, a steric hindrance segment and an adsorption group segment, the prepared superplasticizer product has low surface tension, unification of shrinkage reduction and dispersing performance of concrete can be achieved with a low doping amount, the concrete can be prevented from shrinkage cracking, then the durability of the concrete can be improved, and practical application values are great.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a low surface tension hyperbranched shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The brittleness and shrinkage of concrete are important factors affecting its performance. Shrinkage leads to cracks inside the concrete, which reduces the strength of the concrete and adversely affects its durability. According to survey results, from bridges, roads and other transportation facilities to coastal areas Seaport engineering structures, from civil buildings, commercial buildings to industrial buildings, are affected by cracking problems extremely widely. Therefore, reducing the shrinkage of concrete and controlling the internal defects of concrete are very important to improve the application performance of concrete. [0003] How to reduce the shrinkage of concrete has become the focus of current engineerin...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/24C04B103/30
CPCC04B24/246C04B2103/302C08F283/06C08F283/065C08F220/06C08F222/02
Inventor 林艳梅方云辉余抗建吴传灯陈展华朱少宏林添兴麻秀星郭元强蔡静
Owner KZJ NEW MATERIALS GROUP CO LTD
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