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Curing agent, method for producing cement structure with coating film, shrinkage reduction method and drying suppression method for cement molded body, and method for suppressing penetration of deterioration factor into cement structure

A technology of curing agent and forming body, which is applied in the direction of manufacturing tools, organic chemistry, building construction, etc., and can solve the problems of reduced strength and durability, cracks in cement-like forming bodies, etc.

Inactive Publication Date: 2021-09-03
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, during the curing of the cement-based molded body, moisture is lost from the surface of the cement-like molded body, so drying shrinkage occurs, cracks and other defects occur in the cement-like molded body, and there is a problem that the strength and durability decrease.

Method used

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  • Curing agent, method for producing cement structure with coating film, shrinkage reduction method and drying suppression method for cement molded body, and method for suppressing penetration of deterioration factor into cement structure
  • Curing agent, method for producing cement structure with coating film, shrinkage reduction method and drying suppression method for cement molded body, and method for suppressing penetration of deterioration factor into cement structure
  • Curing agent, method for producing cement structure with coating film, shrinkage reduction method and drying suppression method for cement molded body, and method for suppressing penetration of deterioration factor into cement structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0118] As Example 1, the sample which formed the coating film using the curing agent shown in Table 1 on the whole surface of the said mortar sample was prepared. The coating film is formed by the following method: use a paper towel to wipe off the water on the surface of the mortar sample that has been cured in water for 6 days, and then immediately add a curing agent dropwise, and the dripping curing agent is made of polyethylene terephthalate. The film was evenly spread and allowed to stand. In addition, in Comparative Example 1, no curing agent was used for the above-mentioned mortar sample, and no coating film was formed. In addition, the abbreviations in Table 1 are as follows.

[0119] DHMM: Di-n-hexyl methylene malonate (Tg=-45°C)

[0120] DCHMM: Dicyclohexyl methylene malonate (Tg=140°C)

[0121] Table 1

[0122]

[0123]

[0124] In accordance with JIS A1129, using a dial gauge (manufactured by Nishinippon Testing Machine Co., Ltd.), wipe off the water on th...

Embodiment 2～7 and comparative example 2～4

[0146]As shown in Table 5, except having changed the composition and coating amount of a curing agent, it carried out similarly to Example 1, and performed the measurement of shrinkage reduction rate and mass change rate. In addition, "cratecure" in Table 5 is the trade name of the fat surfactant compound manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd. In addition, the composition (mixing ratio) of the curing agent in Table 5 is a mass ratio. The results are shown in Table 6 and Table 7, respectively.

[0147] table 5

[0148]

[0149] Table 6

[0150]

[0151] Table 7

[0152]

[0153]

[0154] 587 g of ordinary Portland cement (manufactured by Pacific Cement Co.), 264 g of water, and 1350 g of standard sand for cement strength testing (specified in 5.1.3 of JIS R5201-1997 Annex 2: Cement Association) were used in a Hobart type mortar mixer (Hobart type mortar mixer). Made by Butter Co., model: N-50) The mortar was kneaded according to the method of JIS ...

Embodiment 8

[0155] Embodiment 8: after mold box container is demoulded, the curing agent (coating amount 100g / m2) shown in table 8 is coated on the sample surface 2 ), maintained for 27 days in an environment with a room temperature of 20°C and a humidity of 60%.

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Abstract

A curing agent which contains a diester compound represented by formula (I). (In formula (I), each of R1 and R2 independently represents a hydrogen atom or a monovalent hydrocarbon group having 1-15 carbon atoms, or alternatively, R1 and R2 may combine together to form a divalent hydrocarbon group having 3-15 carbon atoms; and each of R3 and R4 independently represents a monovalent organic group having 1-30 carbon atoms, or alternatively, R3 and R4 may combine together to form a divalent organic group having 3-30 carbon atoms.).

Description

technical field [0001] The present disclosure relates to a curing agent, a method of manufacturing a cement-like structure with a coating, a method of reducing shrinkage and drying of a cement-like molded body, and a method of suppressing intrusion of a deterioration factor into a cement-like structure. Background technique [0002] Cement-based materials provide cured products excellent in strength, durability, and the like. Therefore, cement-based materials are widely used as cement compositions such as cement paste, mortar, and concrete. Cement materials are indispensable materials for building civil or architectural structures. [0003] Cementitious structures such as building structures are obtained by pouring a cement composition, molding it into a predetermined shape, making a cementitious body, and then using the moisture in the cementitious body to react (cure) the cement. Here, during curing of the cement-based molded body, moisture is lost from the surface of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/04B28B11/24E04G21/02
CPCC04B40/04B28B11/24C04B41/009C04B41/4578C04B41/4826C04B41/63C07C69/593C08G63/52C09D167/06E04G21/06
Inventor 河合萌犬伏良祐
Owner NIPPON SHOKUBAI CO LTD