Multifunctional carboxylic-acid comb-shape graft copolymer concrete superplasticizer

A graft copolymer and a multifunctional technology are applied in the field of multifunctional carboxylic acid comb graft copolymers and their preparation, and can solve the problems of poor dispersibility, bad smell of dodecanethiol, unfavorable environmental protection, etc. question

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A graft copolymer and a multifunctional technology are applied in the field of multifunctional carboxylic acid comb graft copolymers and their preparation, and can solve the problems of poor dispersibility, bad smell of dodecanethiol, unfavorable environmental protection, etc. question

CN1721361AActive Publication Date: 2006-01-18JIANGSU SOBUTE NEW MATERIALS

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[0096]a) Preparation of defoaming functional macromonomer

[0097] Synthesis Example 1

[0098] Put 501g (0.5mol) of monobutyl polypropylene glycol into a 1000ml three-necked flask with a thermometer, stirring and reflux device in turn, stir and heat up to 60°C, add 49g (0.5mol) maleic anhydride, heat up to 140°C, and keep warm for reaction After 3 hours, a red transparent liquid (E-1) was obtained.

[0099] Synthesis Example 2-3

[0100] The preparation method of E2-E3 all reacts with maleic anhydride equimolar ratio according to embodiment 1, and other reaction conditions are identical with embodiment 1, mainly is that polyether structure and molecular weight are different, and its molecular weight M size is only statistical average value, Its specific structure is shown in Table 2.

[0101] Defoaming functional macromonomer

Polyether structure

R 7

q

p+r

M

E-1

E-2

E-3

C 4 h 9

C 9 h 19

C 6 h ...

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PUM

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Abstract

The multifunctional super concrete plasticizing agent of carboxylic acid comb grafting copolymer is prepared through the water free radical copolymerization of the following monomers: monomer A with the general expression I in 10-40 wt%, monomer B with the general expression II in 30-70 wt%, monomer C with the general expression III in 10-50 wt%, monomer D with the general expression IV in 3-15 wt%, monomer F with the general expression VI in 0-15 wt%, and reactive defoaming agent E in 0.2-2 wt% of the sum of foregoing five kinds of monomer. The present invention can reduce the shrinkage of concrete, and has good adaptability on cement and admixture material, good dispersivity and slump maintaining performance, high weeping resistance and resolution resistance, small pumping drag, product yield near 100 % and no waste produced in the production process.

Description

technical field [0001] The invention relates to a multifunctional carboxylic acid comb-shaped graft copolymer that can be used as a concrete superplasticizer and a preparation method thereof, belonging to the technical field of concrete admixtures Background technique [0002] Concrete is a very widely used structural material in civil engineering, construction, water conservancy and many projects. In modern building construction, ready-mixed concrete has accelerated the construction progress and With the improvement of engineering quality, the application is becoming more and more common, and concrete superplasticizer is the fifth component that is indispensable for preparing ready-mixed concrete. [0003] Concrete superplasticizer, also known as high-efficiency water reducer, mainly plays three different roles in concrete production technology: ① Improve the workability of concrete construction, reduce physical labor intensity, and facilitate mechanization without changing...

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Application Information

Patent Timeline

18 Jan 2006

Publication

CN1721361A

IPC: C04B24/24; C04B24/26; C04B24/04

Inventors: 冉千平; 刘加平