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Polymer, manufacturing method of this polymer, and cement admixture by using this polymer

A technology of polymers and mixtures, applied in the field of polymers, can solve the problems of undisclosed polymers, etc., achieve excellent dispersion performance and improve dispersion performance

Inactive Publication Date: 2008-06-25
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above methods, there is no disclosure of a polymer having a structural unit derived from a polyalkylene glycol chain that is useful as a dispersant for an inorganic powdery substance

Method used

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  • Polymer, manufacturing method of this polymer, and cement admixture by using this polymer
  • Polymer, manufacturing method of this polymer, and cement admixture by using this polymer
  • Polymer, manufacturing method of this polymer, and cement admixture by using this polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0243] Hereinafter, the present invention will be described in more detail by citing the examples, but the present invention is not limited by the following examples, and it can be appropriately modified and implemented within the scope of the foregoing and hereinafter-described purposes, and they are also included in the technical scope of the present invention. Inside.

[0244]

[0245] Installation: Waters Alliance (2695)

[0246] Analysis software: EMpower Professional+GPC Option manufactured by Waters Corporation

[0247] Column: TSKgel guard column (guard column) manufactured by TOSO Co., Ltd. (inner diameter 6.0×40MM)+G4000SWXL+G3000SWXL+G2000SWXL (each inner diameter 7.8×300MM)

[0248] Detector: differential refractometer (RI) detector (Waters 2414), multi-wavelength visible light ultraviolet (PDA) detector (Waters 2996)

[0249] Eluent: Dissolve 115.6 g of sodium acetate trihydrate in a solution of 6001 g of acetonitrile and 10999 g of water, and ad...

preparation example 1

[0267]

[0268] 420 g of water was put into a 3L glass reaction device with an inner diameter of 16 cM equipped with a thermometer, a stirrer with a blade with a height of 2.5 cM and a width of 11 cM, a dropping device, a nitrogen gas introduction pipe, and a reflux cooling device, and stirred at 200 rpm, Nitrogen replacement was carried out in the reaction device at a rate of 100ML / min, while heating to 80°C. Next, under the same conditions, 450.319 g of methoxypolyethylene glycol monomethacrylate (the average added mole number of ethylene oxide: 25) was dripped and mixed in the reaction device at a uniform speed for 4 hours, The aqueous solution obtained by 89.681 g of methacrylic acid, 4.511 g of 3-mercaptopropionic acid (MPA), and 135 g of water was dripped into the reaction device at a uniform speed for 5 hours. Water was added to 6.21 g of ammonium persulfate and adjusted. into a total of 105 g of aqueous solution. After all the dropping was completed, 80° C. was ...

preparation example 2～4

[0269]

[0270] Using the same steps as in Preparation Example 1, only changing the amount of chain transfer agent (MPA) to obtain comparative polymers with different Mw. Table 1 shows the physical properties of the obtained polymers, respectively.

[0271] [Table 1]

[0272]

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PUM

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Abstract

The present invention provides a polymer having a polyalkylene glycol chain, which, unlike conventional copolymers, has a very narrow molecular weight distribution and has specific parameter values, and provides an inorganic compound having excellent dispersibility using this polymer. Dispersants for powdery substances, especially cement admixtures. The polymer of the present invention is a polymer (P) containing a structural unit derived from a polyoxyalkylene chain, satisfying the following formula 1: 1<PD<MD (1); (wherein, PD=Mw / Mn, MD =G(n)×Mw+H(n)) defines the range of PD values.

Description

technical field [0001] The present invention relates to a polymer, a method for preparing the polymer, and a cement admixture using the polymer. Background technique [0002] Polymers having structural units derived from polyoxyalkylene chains, as disclosed in JP-A-9-86990 or JP-A-2001-220417, are widely used as dispersants for inorganic powdery substances like cement . However, conventional polymers have a wide molecular weight distribution and contain a large amount of high-molecular-weight fractions that aggregate inorganic powdery substances and low-molecular-weight fractions that hardly contribute to dispersibility. [0003] In particular, cement dispersants are usually used in building exterior wall materials, building structures, etc., to add water to cement, or to mix sand as a fine aggregate into cement slurry. , Add cement admixture to concrete, etc., in which mortar is mixed with stone as coarse aggregate, and process it to improve the strength and durability of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F4/40C04B24/26
CPCC08G65/32C04B24/32C04B2111/00198C08L71/02C04B24/2647C04B2103/408C08L2666/04C08F4/40C08F220/00C08F230/04
Inventor 坂本登松田优子汤浅务西川朋孝长村洋
Owner NIPPON SHOKUBAI CO LTD