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A kind of loose and anti-adhesive high-performance polycarboxylic acid admixture and its preparation method and application

An anti-adhesive polycarboxylic acid and admixture technology, which is applied in the field of loose and anti-adhesive high-performance concrete admixtures, can solve problems such as increased viscosity, bottoming and poor flow performance, and achieve lower viscosity and lower raw material costs , enhance the effect of adsorbing water molecules

Active Publication Date: 2016-09-14
上海新浦特种助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of increased viscosity, bottoming and poor flow performance of polycarboxylate (PCE) admixtures in the prior art when applied to freshly mixed high-strength concrete, and to provide a novel loose and anti-adhesive Type high-performance polycarboxylic acid admixture and preparation method thereof

Method used

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  • A kind of loose and anti-adhesive high-performance polycarboxylic acid admixture and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0031] 1) In a 1000ml four-necked flask, add 380g of deionized water as bottom water, add 95g of polymerized monomer (IV) and 5.2g of chain transfer agent sodium allyl sulfonate SAS, dissolve while stirring and heat up to 60~ 65°C.

[0032] 2) Add a mixture of 2.1 g of hydrogen peroxide (30%) and 10.5 g of pure water under nitrogen protection, and stir for 5 minutes.

[0033] 3) Start to drop the ester-based macromonomer MPEGMAA 148g and 210g of deionized water.

[0034] 4) At the same time drop by methacrylic acid 50g and EDTMP (embodiment 2 is the compound of PBTC) 5.5g composition.

[0035] 5) Add dropwise the initiator consisting of APS6.3g and deionized water 105g at the same time.

[0036] 6) Adding control The dropping time is 2 to 3 hours.

[0037] 7) Then add 0.5 g of acrylamide, a rheology adjusting assistant, at one time.

[0038] 8) Then heat-retain and react for 1 hour, and the temperature is controlled at 80-90°C.

[0039] 9) It is detected th...

Embodiment 3

[0041] 1) Add 600g of 60% HPEG to a 1000ml four-necked flask, and add 3.0g of SAS, dissolve while stirring and heat up to 50-55°C.

[0042] 2) Add APS 1.2g and stir for 10 minutes.

[0043] 3) A mixed solution consisting of 38 g of acrylic acid, 5 g of HEDP and 8.75 g of deionized water was added dropwise.

[0044] 4) Simultaneously dropwise add a mixed solution consisting of 95 g of AA-LS polymer and 150 g of deionized water.

[0045] 5) After the dropwise addition is completed, 0.5 g of APS is added for the second time, and the temperature is raised to 60°C.

[0046] 6) Add 3g of urea, keep warm for 1 hour, then cool to 40-45°C, adjust P with liquid caustic soda H 6 to 6.5 is enough.

[0047] 7) Measure the solid content and replenish water to adjust the solid content to 40%±0.5%.

Embodiment 4

[0049] 1) In a 1000ml four-neck flask, add 600g of 60% concentration of polyethylene glycol methacrylate MPEGMAA and 100g of 60% concentration of MPEGAA, and add SAS3.0g, dissolve and heat up to 50-55°C while stirring.

[0050] 2) Add APS 1.2g and stir for 10 minutes.

[0051] 3) Add acrylic acid dropwise 38g, HEDP5g and deionized water 8.75g.

[0052] 4) Simultaneously dropwise add a mixed solution consisting of 95 g of AA-LS polymer and 150 g of deionized water.

[0053] 5) After the dropwise addition is completed, 0.5 g of APS is added for the second time, and the temperature is raised to 60°C.

[0054] 6) Add 3g of urea, keep warm for 1 hour, then cool to 40-45°C, adjust P with liquid caustic soda H 6 to 6.5 is enough.

[0055] Measure the solid content and replenish water to adjust the solid content to 40% ± 0.5%.

[0056] Detection and Application:

[0057] 1) Concrete performance comparison after adding example 1, example 2 and GJ-80G

[0058]...

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Abstract

The invention discloses a high-performance concrete water reducer with loose and anti-adhesive properties. It is a polycarboxylate high-performance water reducer that can reduce the viscosity of concrete and adjust the porosity. Through screening and adjusting the ratio of PCE synthetic raw materials, non-traditional PCE synthetic raw materials are introduced; modified lignin and acrylic acid pre A new type of loose and anti-adhesive polycarboxylate high-performance water reducer is prepared by polymerizing monomers, organic phosphonate compounds capable of changing viscosity and temperature resistance, and rheological performance modifiers. In order to meet the requirements of lowering viscosity, not peeling off the bottom, improving workability and expansion degree when preparing high-strength concrete, it has received better results in practical applications.

Description

technical field [0001] The invention relates to a loose and anti-adhesive high-performance concrete admixture, in particular to a polycarboxylate-based high-performance water reducer capable of adjusting and reducing the viscosity of fresh concrete and having loose performance and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer is the third generation concrete superplasticizer at present. It has the advantages of high water reducing rate, low dosage, good workability, good work performance, and no pollution. Competing research and development for the majority of scientific research institutions and production enterprises. With C 60 ~C 100 High-strength concrete is increasingly being widely used in the construction industry and infrastructure facilities, and the requirements for concrete admixtures are also increasing. Especially in a wide range of application fields, how to adapt to the requirements of high-strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/56C08F291/06C04B24/26C04B103/30
Inventor 苏莹
Owner 上海新浦特种助剂有限公司
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