Powdery polycarboxylic-acid cement dispersant and dispersant composition containing the dispersant

A cement dispersant and polycarboxylic acid-based technology, used in the field of dispersant compositions and powdered polycarboxylic acid-based cement dispersants, can solve the problems of insufficient improvement of the performance of concrete products, prevent caking and have excellent solubility. , Improve the effect of water reduction

Inactive Publication Date: 2008-02-13
SIKA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems eventually lead to serious problems in which the performance of concrete products cannot be sufficiently improved, so they must be avoided at all costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] For the preparation of polyamide polyamine, that is, the polycondensation reaction of compounds a, b and c, for example, at first only compound a and compound b are polycondensed, and then adding compound c as a monobasic acid to continue polycondensation is a two-step reaction method, or A one-step reaction method of polycondensation by mixing compounds a, b, and c at the same time from the beginning, etc. However, no matter which method is used, since the polycondensation reaction, that is, the amidation reaction and the exchange amidation reaction proceed simultaneously, the acrylic acid residue or the methacrylic acid residue derived from the compound c is finally located at the end of the polyamide chain, and it can be considered that is to get the same result.

[0051] Next, the reaction molar ratios of the above three components constituting the polyamide polyamine will be described. The reaction ratio of compound b (diacid or its ester) to 1.0 mol of compound a...

Synthetic example 1

[0079] [Synthesis Example 1] Preparation of Polycarboxylic Copolymer

[0080] Add 1400g of water to a 5L (liter) reactor equipped with a stirrer, a nitrogen inlet pipe, a condenser, and a thermometer, and introduce nitrogen into the reaction vessel to make the synthesis system a nitrogen atmosphere, and then heat up to 80°C. Add 380 g of water and 496 g of polyamide polyamine as Compound A to the first dropping funnel equipped with a stirrer (compound A-1 prepared according to the production method described in Japanese Patent No. 3336456 (solid content 40%) , with respect to the added mass ratio of all monomers is 15%), 290g of methacrylic acid (compound B-1, mass ratio of 20%) as compound B, and 1244g of methoxy PEG (poly Ethylene glycol) (molecular weight 1000) ester (compound C-1, mass ratio 65%) mixture. To the second dropping funnel was added 440 g of a 10% aqueous solution of thioglycolic acid. Next, 489 g of 10% sodium persulfate aqueous solution was added to the thi...

Synthetic example 2～6

[0081] [Synthesis examples 2-6] Production of polycarboxylic acid-based copolymers

[0082] The kind, quality and alkali kind of each monomer of compound A, B, C are changed into the numerical value shown in following table 1, other according to the same method as above-mentioned synthetic example 1, prepare polycarboxylate copolymer 2~6 respectively of aqueous solution.

[0083] [Table 1]

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PUM

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Abstract

A powdery polycarboxylic-acid cement dispersant having a polymer backbone comprising a polyamide-polyamine. It has the effect of being capable of improving water amount reduction, slump flow retention, and concrete strength development. Furthermore, it is effectively prevented from suffering blocking and has excellent solubility in a slurry. It can be evenly mixed with an inorganic powder. The dispersant is characterized in that it comprises a powdery cement dispersant obtained by drying a solution or dispersion of a copolymer having a polymer backbone comprising a polyamide-polyamine to obtain a powder of the copolymer, and that the powder is composed of spherical particles having an average particle diameter of 30-300 [mu]m and a particle size distribution in which particles having a particle size of 50-350 [mu]m account for 70% or more of the total mass amount.

Description

technical field [0001] The present invention relates to a powdery polycarboxylate cement dispersant for inorganic substances such as cement, mortar, concrete, gypsum, and a dispersant composition containing the dispersant. Background technique [0002] At present, cement dispersants have been circulated and operated in the form of liquids, but these liquid cement dispersants have problems such as pollution and leakage when metering or adding to cement complexes, which worsen the operating environment, or when mixed with cement complexes. It is difficult to mix homogeneously when mixing. Therefore, in order to solve these problems, people have proposed a method of making the cement dispersant itself into a powder form, a method of adsorbing a liquid cement additive on an appropriate inorganic or organic powder, or a liquid cement additive A method of granulating and pulverizing with an appropriate inorganic powder. [0003] As powdery dispersants, for example, naphthalene-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06C04B103/40
CPCC04B2103/308C04B2103/302C04B24/2658C04B24/2647C04B24/2694C04B2103/0057C04B40/0042C04B2103/408C04B14/06C04B20/008C04B2103/50C04B24/26C04B2103/40
Inventor W·M·丹青格斋藤贤友寄哲小林笃池田亮黑田贤一
Owner SIKA LTD
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