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Amphiphilic comb-shaped superplasticizer

A superplasticizer and amphiphilic technology, which is applied in the field of plasticizers and can solve the problems of the influence of dispersion performance without too many studies

Inactive Publication Date: 2018-05-29
韩会义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a kind of surfactant, polycarboxylate water reducer has amphiphilic molecular structure. Previous studies have focused on the hydrophilic groups in the molecular structure of the water reducer, such as polyoxyethylene (PEO), carboxylate The impact of the type, number and length of the sulfonate, etc. on the dispersion performance of the water reducer, while the hydrophobic groups in the molecular structure of the water reducer, such as long-chain alkyl groups, silyl groups, etc. There is not much research on the impact of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0013] The preparation raw material of amphiphilic comb type superplasticizer is as follows: maleic anhydride (MA) and ammonium persulfate (APS): analytically pure, lauryl methacrylate (LMA): purity ≥ 98.0%; Enol polyoxyethylene ether (TPEG): industrial product, relative molecular mass is 2400; absolute ethanol, sodium hydroxide: analytically pure. Benchmark cement (P.I42.5): in line with GB8076-2008 national standard, Blaine specific surface area is 350m 2 / kg, the density is 3.14g / cm 3 . The preparation steps of the amphiphilic comb-type superplasticizer are as follows: PC and APC adopt the same synthesis method, PC is a common polycarboxylate superplasticizer, which is formed by copolymerization of MA and TPEG; APC is a polycarboxylate with a long hydrophobic side chain Polycarboxylate water reducer is formed by copolymerization of MA, TPEG and LMA, the specific method is as follows. Add 130g deionized water, 12.26gMA and 120g macromonomer TPEG into the four-neck flask, ...

Embodiment example 2

[0015] Infrared spectrum test: PC and APC products are pressed into tablets by KBr, and the molecular structure is determined by FT-IR (TENSOR27, BRUKEROPTICS, Germany). Result and analysis: 3500~3000cm －1 There are two broad absorption peaks, which are the characteristic absorption peaks of the hydroxyl group on the carboxyl group in the acid anhydride and the hydroxyl group in the PEO side chain, indicating the existence of the hydroxyl group. at 1108cm －1 The stretching vibration peak of the ether bond C-O-C appears at the position. Compared with the PC spectrum, APC is at 2885cm －1 There is a more obvious absorption peak, which is the stretching vibration peak of C-H on the long side chain of the hydrophobic alkyl ester; at 1466cm －1 and 1399cm －1 The peaks appearing at the long side chain of the hydrophobic alkyl ester are the antisymmetric and symmetrical bending vibration absorption peaks of -CH3 respectively, and the peaks at 1300-1192cm －1 The stronger double pea...

Embodiment example 3

[0017] Using dimethyl sulfoxide (DMSO) as a solvent, the 1H-NMR of the sample was tested at room temperature using a nuclear magnetic resonance instrument (AVANCEIII, Bruker-500MHz) produced by Bruker, Switzerland. Result and analysis: The characteristic hydrogen in the molecular structure of the copolymer corresponds to the proton peak of the 1H-NMR test spectrum. There are proton peaks at Ha-δ1.08, Hb~e-δ3.31~3.80 and Hf-δ4.54, indicating that the macromonomer polyether participates in copolymerization; at Hg-δ3.60 is the C12 alkyl side The proton peak on the first methylene chain connected to the ester group (-COO 2 -), Hh-δ1.62 is the proton peak on the second methylene group connected to the C12 alkyl side chain and ester group (-COOCH 22 (CH 2 ) 9 CH 3 ), the proton peaks at Hj-δ1.24 and Hk-δ0.86 are the other proton peaks on the hydrophobic alkyl chain (-COOCH2CH 2 (2) 9 CH 3 ) and terminal group proton peak (-COOCH 2 CH 2 (CH 2 ) 93 ), indicating that the hy...

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Abstract

An amphiphilic comb-shaped superplasticizer is disclosed. In order to study the effect of hydrophobic long side chains on the dispersibility of comb superplasticizers, an amphiphilic comb-shaped poly(dodecyl methacrylate)-isoprenol polyoxyethylene ether-maleic anhydride terpolymer (APC) is prepared by an aqueous solution free radical copolymerization by use of ammonium persulfate as an initiator.Comb type. Three monomers are well copolymerized. The weight average relative molecular mass and the number average relative molecular mass of a sample are 50625 and 10173, respectively. The relativemolecular mass distribution index is 4.97. Through introduction of a hydrophobic alkyl ester long side chain, the comb copolymer is self-assembled in a cement pore solution to form micelles with a diameter of more than 100 nm. A TEM (transmission electron microscope) observes the micelles to find that the micelles are spherical and cemented together to form agglomerates, the hydrodynamic radius and the solvation layer thickness of the copolymer can be increased, and the dispersion properties of a water reducer can be reduced.

Description

technical field [0001] The invention relates to a plasticizer, in particular to an amphiphilic comb-type superplasticizer. Background technique [0002] Plasticizer (plasticizer) is a polymer material additive, and also a phthalate ester (PAEsphthalates) in environmental estrogens. There are many types, and the most common variety is DEHP (commercial name DOP). The chemical name of DEHP is bis(2-ethylhexyl) phthalate, which is a colorless, odorless liquid and is widely used in industry. Plasticizers are generally also called plasticizers. Plasticizer is a polymer material additive widely used in industry. Adding this substance in plastic processing can make it more flexible, easy to process, and can be legally used for industrial purposes. Taiwan manufacturers use a common plasticizer DEHP (later detected DINP, DNOP, DBP, DMP, DEP, etc.) instead of palm oil to prepare a clouding agent that can also produce a thickening effect similar to that of an emulsifier. However, ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/06C08F220/18C04B24/26C04B103/30
CPCC04B24/267C04B2103/302C08F283/065C08F220/1812
Inventor 韩会义
Owner 韩会义
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