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A kind of high workability cement dispersion polymer and preparation method thereof

A polymer and cement technology, used in solid waste management, climate sustainability, sustainable waste treatment, etc., can solve problems such as poor workability of water reducing agents, achieve high water reduction rate, improve cohesion and water retention , the effect of reducing costs

Active Publication Date: 2022-06-03
FUJIAN KZJ NEW MATERIALS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the problem of poor workability of the existing water reducer mentioned in the above background technology, the present invention provides a high workability cement dispersion polymer, the high workability cement dispersion polymer comprising:

Method used

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  • A kind of high workability cement dispersion polymer and preparation method thereof

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preparation example Construction

[0041] The invention provides a preparation method of high workability cement dispersion polymer, which specifically comprises the following steps:

[0042]The ester group-containing polymer and polyethylene glycol monomethyl ether were added to the reactor, the temperature was raised to 95°C, and nitrogen was continuously introduced. After all the water was distilled, carboxymethyl starch and a catalyst were added, and the reaction temperature was raised to 120 ~ 160 ℃, while vacuuming to make it react for 2 ~ 4 hours under the vacuum degree of 40 ~ 80 mbar, the polymer in the molten state can be sliced, or cooled to below 70 ℃, add a certain amount of water and mass concentration It is neutralized with 30% sodium hydroxide, so that pH=6~7, that is, a cement dispersing polymer with a mass concentration of 50% is prepared, and the molecular weight is 60000~100000.

[0043] Wherein, the preparation method of the described ester group-containing polymer comprises the following s...

Embodiment 1

[0049] 1) the deionized water of 50g is joined in the reactor, when temperature rises to 30 ℃, drip 25g mass concentration respectively and be 10% hydrogen peroxide solution A, 35g mass concentration is 5% L-ascorbic acid aqueous solution B, 10min After that, the mixed solution C of 35g methyl acrylate, 40g 4-vinyl benzoic acid, 25g sodium methallyl sulfonate and 30g deionized water was added dropwise and dripped in 100min,

[0050] 2) After the dropwise addition, add 5g of solution A and finish dropping within 10min, and ripen for 0.5 hour to obtain a copolymer solution with a solid content of 45.5%, a viscosity of 660cps and a weight average molecular weight of 6700.

[0051] 3) 200g of copolymer and 50g of polyethylene glycol monomethyl ether were added to the reactor, the temperature was raised to 95°C, and nitrogen was continued to be introduced. After all the water was distilled, 20g of carboxymethyl starch and 1g of rare earth solid superacid SO were added. 4 2- / TiO ...

Embodiment 2

[0053] 1) the deionized water of 50g is joined in the reactor, when temperature rises to 30 ℃, drip 25g mass concentration respectively and be 10% ammonium persulfate aqueous solution A, 35g mass concentration is 5% sodium hypophosphite aqueous solution B , after 10min, add dropwise the mixed solution C of 40g of ethyl acrylate, 45g of 4-vinylphenylacetic acid, 15g of sodium styrene sulfonate and 30g of deionized water and drip it in 100min,

[0054] 2) After the dropwise addition, add 5g of solution A with a mass concentration of 10% and drip it in 10min, and ripen for 0.5 hour to obtain a copolymer solution with a solid content of 45.7%, a viscosity of 760cps and a weight-average molecular weight of 7800. .

[0055] 3) 200g of copolymer and 60g of polyethylene glycol monomethyl ether were added to the reactor, the temperature was raised to 95° C., and nitrogen was continued to be introduced. After all the water was distilled, 10g of carboxymethyl starch and 1g of rare earth ...

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Abstract

The present invention relates to the technical field of building admixtures, in particular to a high workability cement dispersion polymer and a preparation method thereof, wherein the polymer comprises: a) an ester-containing polymer, and the ester-containing polymer comprises A polymer or copolymer derived from monomers comprising: 1) an unsaturated carboxylate monomer; and 2) at least one of an unsaturated acid monomer, an unsaturated sulfonate monomer; and b) carboxymethyl starch; and c) polyethylene glycol monomethyl ether. The invention provides a high workability cement dispersion polymer, adopting the method of low-temperature copolymerization first and then high-temperature esterification, which reduces the destruction of the double bond of the reaction monomer, improves the degree of copolymerization, and produces a cement dispersion polymer with a high water-reducing rate , good workability, solves concrete quality and durability problems caused by bleeding, segregation and poor compactness of concrete, especially for different cements, admixtures, artificial sand, ambient temperature and concrete mix ratio fluctuations Has excellent adaptability.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a high workability cement dispersion polymer and a preparation method thereof. Background technique [0002] With the continuous promotion of national key engineering projects, as well as the complexity of the structure and the harsh conditions of the structure, the quality and durability of the concrete structure are posed even greater challenges. , so that the temperature inside the concrete rises, and the heat of hydration accumulated in the concrete is not easy to dissipate. When the tensile stress generated by the temperature difference between the inside and outside of the concrete exceeds the compressive strength of the concrete in the early stage of concrete setting, it will lead to cracks in the concrete, which will seriously affect the concrete. strength and durability. [0003] The current possible effective solution is to add materials such as polycarboxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C04B24/28C04B103/40
CPCC08G81/025C04B24/28C04B2103/408Y02W30/91
Inventor 柯余良方云辉张小芳钟丽娜邱岳涛
Owner FUJIAN KZJ NEW MATERIALS CO LTD
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