JPS59131552A - Shrinkage decreasing agent for cement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a shrinkage reducing agent for cement.

Conventionally, one of the serious drawbacks of cement mortar and concrete (hereinafter referred to as cement compositions) is that they are susceptible to dry cracking. This is due to the large drying shrinkage of the cement. Therefore, it is desired to reduce drying shrinkage of cement compositions.

In order to reduce the drying shrinkage of cement compositions, a method of mixing latex such as acrylic latex or synthetic rubber latex into the cement composition has been used, but in this case, a large amount of relatively expensive latex ( for example,
Since it is necessary to mix it in an amount of about 20 to 30% by weight of the cement, this is not only economically undesirable, but also causes a fatal defect in that the strength of the cement composition is significantly reduced. A serious drawback arises in that the inflammability of the cement composition is impaired by the inclusion of a large amount of latex.

Furthermore, although inorganic expandable admixtures (for example, calcium sulfoaluminate-based expandable admixtures) have been developed in recent years, they are not sufficient to essentially reduce drying shrinkage. In addition, the present inventors have discovered that an alkylene oxide adduct of a specific lower alcohol described in Japanese Patent Publication No. 56-51148 has an excellent effect of reducing shrinkage of cement. In order to prevent dry cracking of the cement composition by using it, it is necessary to increase the amount added (for example, about 4 to 5% by weight based on the cement).

Under such circumstances, the inventors conducted extensive research into an effective shrinkage reducing agent for cement that does not have the above-mentioned drawbacks and can prevent dry cracking in cement compositions even when added in a smaller amount, and as a result, the present invention has been developed. reached.

That is, the present invention is based on the general formula (1), where R2 and R3 are hydrogen or an alkyl group having 1 to 8 carbon atoms, and A
is an alkylene group having 2 to 3 carbon atoms, and n is a number of 0 to 30). This is a shrinkage-reducing agent for cement that further improves the shrinkage-reducing effect and contains the compound shown in 1) and a fluorine-based surfactant and/or a silicone-based surfactant.

The compound represented by the general formula (1) of the present invention can be obtained by reacting acetylene with formaldehyde or a ketone compound having an alkyl group having 8 or less carbon atoms in the presence of an alkali. , or alkylene oxide adducts of these alcohols.Acetylene alcohols, acetylene glycols, or alkylene oxide adducts of these alcohols having an alkyl group having 9 or more carbon atoms are undesirable because the shrinkage-reducing effect decreases.

Examples of acetylene alcohols used in the present invention include propargyl alcohol (C)I=CCt120H);
Methylbutino) Lt CCH:C-C(C113)(
OH) CH3E, methylbenzenol (CI+=(nee C(CH3XOII) C2)15), dimethylhequinol CCH-=C-C (CH3XOH machine Cl
(C113)2), J tilheptyl/-ru [CH=C
-C (CH3
0H) Cs Hn ), methi) v) nano-ru jcl
l: C-c(CH3XOH) C6Hl3), methyldecyl/-)L/ CCH-C-(, (CH3XOH)
C7R15), methylundecinol JCIl=C
-C(CH3X0H) C8R17) , dimethyldecinol (C1l=C-'C(CH3X0H) C112
Cl1 (C113) C5Hll), ethylpentynol (CH=C-C(C2H5XOH) C2H5],
Methyl ethylhexynol (CH3C-C, (C2ll
5XOII) C112CIDC113) C113)
, ethylheptenol CC113C-C(C2+15
XOII) C4119), ethyl octinol (C
H=C-C(C2Hs X0H) Cs l-111)
, ethylnonanol CC) IteC-C(C21+5X
OII) C6I13), ethyldecinol (CH-
=C-C(C2+15XO former C71115)1, ethylundecinol (CH=C-C(C2tlsXO1l)
C5H17], methylethyldecinol (CH=C-
C(C2Hs X0H) CI(2C11(CH3)
C5H11), propylhexynol (CH=C-C
('C5H7XOH) C3t17) , Methylpropylhexynol (CH; C-C(C3H7XOH) C
t12C)I(C113) CH3) , propyl octinol (CH:C-C(C31170OH) C41
19), Propyloctinol [CH=C-C(C3
H7XOH) Cs Hn), propylnonanol CC
H=C-C(C3H7)(OH) C6I13), propyldecinol (C1l=C-C(C3H7XOH)
C71h5), propylundecinol (CH=C
-C(C3H7'X0H) C5H17], methylpropyldecinol (CHJC-C(C3117X0H)
C112Cl1(CIl3) C511+t), Butylheptinol (CH=C-C(C4119XOH)
C41-19), methylbutylhexynol (CI
I= C-C(C4I9X0H) C11'2 Ct
l(CIl3) C113:l, butyl octinol (C1l::C-C(C41190OII) CsI
h+ 3, butylnonanol (CIl:C-C(C4
119XOIl) Cs 1113), butyldecinol (CH=C-C(C4119XO1l) C71h
5), butylundecinol (CH=C-C(C41
19XOH) C8H+7), methylbutyldecinol (C)l=c-C(C4l1gXOH) CH2CI
(Ch) C5Hll :l, pentyl octinol CCII=cc(Cs HllXOII) C511
+t), pentylnonanol [Cl1-C-C(C
51111X0H) C51113), pentylnonanol [all=cc (Cs Hll X0H)
C71h5), pentyl octinol CCH=C-C
(Cs HllXOH) C.

1117), methylethyldecinol CCIC-C (C
5N11 X0H) C112CH (C113) C5
Htl), hexylnonanol (Cll=C-C(C
e I13 XQH) C6HI3), hexyldecinol [c++=cc (Cs HI3 XO!(
) C7H15], hexylundecinol (Cti3C-C(CeI13X0H) C8HI7),
Methylhexyldecinol [C)l=c-C(Cs H
I3X Kano) CIl2 CH (CH3) Cs ) 11t
), heptyldecinol (CH-1:C-C(C?)
H15XOH) C7+115), heptylundecinol CCH-=C-C(C7N+5 X0tl) Cs
I17), methylhebutyldecinol [cll=
c-C(C71h5XOII) CH2C41(C11
3) C3Ht+ ), octylundecinol CC1
12C-C(C81117X0II) Ca HI7)
, methyloctyldecinol CC) 1.11:C-C
(CB ++17 X0H) ClI2 CH(CH3
)C5In), etc. Examples of acetylene glycol include butyne diol (HOCH2-
C-1C-CH20H), dimethylhexynediol (C113C(CIl3X0H)-C=C-C(CI
l3
c-C(CH3XOHI)C2+14), diethyldecynediol (C3117C(Cl13X0II)
-C=C-C(C113XOII) C3+17]
, didimethyldobuscinediol C4Hg, C(CIl3
X0II> -C-C-C(CIl3X0H) C
4119), tetramethyldecynediol (C113C
H(CIl3) C112C(C113X0H) -C
=C-C(CH3X0I() C112Cl1(C11
3) CH3], dimethyltetradecinediol (C5
uli C(C113X, 011) -C=C-C(C
H3XOH()C3Hu), dimethylhexadecinediol(C6HI3C(CH3XOHI)-C
=C-C(CI-13XOH) Cs +3), dimethyloctadecinediol CC? , HI5 C (CI
l3 X0H) (:=(nee C(C113X O
former C711,5), dimethyl eicosindiol (C
8H17C(C113X011) -C=C-C(CI
l3
CH2C(C113XOI+) -C= C-C(C
H3XOH) C112CH(CIl3) Cs Hl
], ethyl octyne diol CC285C (Ci
sXOH) -C=C-CCC2H3)(OH>C2H
3), diethyldecynediol (C3I7C(C2H
5XOII) -C=C-C(C2HsXOtl) C
3H7), diethyldecynediol (C4119C(
C211sXOt+) (:=C-(: (C2I
Is X0II) C4119], didimethyldiethyldinone diol CCH3C11(C113) C)12
C(C2H5XOH) -C=C-C(C2+15
X0tl) CIa2CIl(CH3) CH3:l
, ethyltetradecine diol (Cs lln C(
C2115XOH) -C=C-C(C2+1S X0
H) Cs lh+ ), diethylhexadecinediol (C6I13 C(C2115XOH) -C=C
-C(C2H5XOII) C6HI3) , diethyl octadecine diol CCI HI5 C(C2)15
XO11) -C:C-C(C2115XOH) C7
H15), diethyl eicosindiol (Cs HI7)
C(C2tlsXOH) -C=C-C(C2H5X
O1l) Cs HI7) , dimethyldiethyl octadecine diol (C5811CH(CH3) CI2
C(C2HsXOH) -CmiC-C(C2H5XO1
l) CH2Cl1(CH3) Cs Hu), dipropyl diginiol (C3117C(C3H7XOH
) -C=C-C(C3H7XOH) C3H7], dipropyl dobusindio-JL/ (C4149C(C3
117XOII) -C=C-C(C3H7XOH)
C4H9), dimethyldipropyldecynediol (C
H2Cl (Ct13) C112C (C3H7XOH)
-C=C-C(C3H7XOH) CH2CH(CH
3) CH3), dipropyltetradecinediol (C
5Hu C(C3H7X0H) -C=C-C(C3H
7X0H)C5Hn), dipropylhexadecinediol (Cs1113C(C3H7XO1l)-
C=C-C(C3H7XOH) C8HI3), dipropyloctadecinediol (C7I15 C(C31
17XOH) -C-i-C-C(C3117)(OH
) C7I15) , dipropyleicosindiol (
C8H17C(C3H7X0H) -C=c-C(C3
H7XOH) C8I17) , dimethyldipropyloctadecinedio-)Ii (C5H11CH(CH3)
CH2C(C3+17 X0II) -C=C-C(
C3H? X0H) CH2Cl1(CH3) C5H
11], Sibutyldodecindio-71/ (C4Hg
C(C4H9XOH) -C=C-C(C2H5XO1
l) C4H9) , dimethyldibutyldecynediol (C113CH(C113) CH2C(C4H9XO
tl) -C=C-C(C4hXOH) CH2CH(
CI+3) CH3], dibutyltetradecinediol (C5Hn C(C4H9XOH) -C=C-C(C
4119XOII) C5)+11), dibutyl eicosindiol [Cs HI3 C(C41+9XO
H) -C=C-C(C4t1gXOH) C6HI3
), dibutyl eicosindiol CC7I15 C(
C4H9XOH) -C=C-C(C4H9XOH)
C7H+5], dibutyl eicosindiol (Ca I
17 C(C4H9XI)H) -C=C-C(C41
19) (on) C8I17) , dimethyl dibutyl octadecine diol (Cri Hll CH (C113)
CH2C(C4H9X0II) -C=(nee(:
(C4)+9XOH) Ct12CH(CH3) C
5Hll), dibentyltetradecine diol (C
5Hll C(C5HllXOII) -C=C-C(
Cs Hn
OH) -C=C-C(Cs Hll Xo)I) C
s HI3), dihenthyl octadecine diol CC
? -I15C(C5Hll)(Oll) -C=C
-C(Cs Hn
ll X0H) -C=C-C(Cs Hn X0H)
C8I17), dimethyl dipentyl occudecine diol (C5H11CH(C113)CH2C(Cs
Hll X011)-C=C-C(C5Htt X0H
) C112Cl1(CH3) C5Hlt ), etc., and its derivatives methylbutynediol (HOC112=C=C
-CH(C113) 0ll), methylpentine diol (HOCH2-C-=C-C(C113)20H)
, methylethylheptynediol (CH3C(C2+
15 X0H) -C=C-C(C113XOH) C
Ha) ,)limethyloctynediol (CH3C1
l(CH3) CH2C(CH3X0H) -C=C-
Various compounds such as C(C113X0II) CH3) can be mentioned.

In the case of acetylene glycol, the R2 and R3 groups in R1 do not need to be symmetrical with respect to the acetylene group, and can be different alkyl groups within the range of the number of carbon atoms in the alkyl groups R2 and R3. These various acetylene alcohols,
Among acetylene glycols, R2 and R3 in general formula (1) are hydrogen or an alkyl group having 1 to 4 carbon atoms in terms of shrinkage reducing effect, and the total number of carbon atoms of these alkyl groups R2 and R3 is 0 to 10. It is preferably within the range.

In the general formula (1) of the present invention, the alkylene oxide constituting (AO)n is ethylene oxide and/or propylene oxide. Furthermore, in the present invention,
When the total carbon number of the alkyl groups R2 and R3 is 0 to 10, n is a number from O to 30, and when it is 11 to 32, it is a number from 2 to 30. Alkyl group R2
When and R3 are acetylene alcohols or acetylene glycols having a total carbon number of 11 to 32, itself,
It has almost no solubility in water, and its shrinkage reduction effect is significantly reduced. For this reason, in the case of acetylene alcohol, it is necessary to add at least 2 moles or more of ethylene oxide on average per mole of the acetylene alcohol, and in the case of acetylene glycol, it is necessary to add at least 4 moles of ethylene oxide per mole of the acetylene glycol. .

In some cases, 2 or 4 moles or more of ethylene oxide and propylene oxide may be co-added in a block or random manner. In case of co-addition, the molar ratio of ethylene oxide/propylene oxide to water should be at least 0.2/8
It is necessary to maintain decomposition and affinity, and to exert a shrinkage-reducing effect. Furthermore, the mono- or polyokine alkylene group added to acetylene glycol does not have to be the same as the acetylene group, and may be added only to one hydroxyl group, or the oxyalkylene groups added to both hydroxyl groups may be different from each other. Furthermore, the co-addition structure may be different, such as a block shape or a random shape. It should be noted that if the number n exceeds 30, the shrinkage reducing effect will decrease, which is not preferable.

In the compound represented by the general formula (1) of the present invention, when the total carbon number of the alkyl groups R2 and R3 is O to 10, n
Even if it is O, it has sufficient solubility in water and also has a sufficient shrinkage reducing effect, so it can be used without adding alkylene oxide.

However, addition of alkylene oxide often improves the shrinkage reduction effect, so it is preferable to add alkylene oxide. In this case, particularly preferred from the viewpoint of shrinkage reduction effect are:
This is when n is a number within the range of 2-10. moreover,
Among the compounds represented by general formula (1), the alkyl group R2
When the total number of carbon atoms between and R3 is 0 to 10, it is also preferable to add propylene oxol alone, and it is also preferable to add propylene oxide and ethylene oxide together to reduce shrinkage. preferable. in this case,
The molar ratio of ethylene oxide/propylene oxide is 0~
The range of 5 is preferable, and the range of 0.2 to 5 is particularly preferable. In addition, alkylene oxides other than ethylene oxide and propylene oxide, such as butylene oxide and styrene oxide, may be co-added (
(Usually 50% by weight or less of the total oxyalkylene) can also be used.

In the present invention, an excellent shrinkage reducing effect can be obtained by using one or a mixture of two or more compounds represented by the general formula (1) as an essential component. When a surfactant is used in combination, the shrinkage reducing effect is improved due to a synergistic effect, which is very preferable. There are cationic, nonionic, and anionic types of fluorosurfactants and silicone surfactants that are used in combination with these, and any of these can be used, but cationic and nonionic surfactants have 9 benefits in reducing shrinkage. It is preferable from this point of view, and nonionic type is particularly preferable.

The fluorosurfactant used in the present invention may be any commercially available fluorine surfactant and is not particularly limited. A typical example of a cationic fluorosurfactant is a compound having a perfluoroalkyl group having 5 to 18 carbon atoms as a hydrophobic group, and a cationic hydrophilic group (for example, a quaternary ammonium base, etc.). There is. Examples include Fucolade FC-134 manufactured by Sumitomo 3M 0@, Mega Fanoku F-150 manufactured by Dainippon Ink Chemical Shishari, etc.
Surflon 5121 manufactured by 9 Rumorsha, Neos ■
Stargent 300 manufactured by Tohoku Fertilizer FT1, F1-Knob EF-123B, F-Top EF-13 manufactured by Tohoku Fertilizer FT1.
Two things can be mentioned. A typical example of a nonionic fluorosurfactant is a compound consisting of a perfluoroalkyl group having 5 to 18 carbon atoms as a hydrophobic group and a nonionic hydrophilic group (such as an ethylene oxide adduct). be. For example, purchasing 3M (Florado FC-170c of Rizsha Co., Ltd.), Nippon Ink Chemical (Mega Fanoku F-142D, F-1440, F-17 of Ichinshamei Co., Ltd.)
1, F-177, Asahi Glass 0 Rumorsha “A’s Surf [:175
-141, Ne, f-711i company gnos 7'-chef
t-200, 251, Tohoku Fertilizer ((to EF-TOP EF-121, EF-122, El-122B,
Examples include EF-122C and EF-122 to 3. Typical examples of anionic surfactants include perfluoroalkyl groups having 5 to 18 carbon atoms as hydrophobic groups, and dirt and anionic hydrophilic groups (e.g., sulfonic acid groups, carboxylic acid groups). , phosphate ester group). These include Sumitomo 3M 1; Florado FC-95, FC-98, FC-126, and FC manufactured by Sumitomo 3M Co., Ltd.
-128, Dainippon Ink Chemical (Megafanoku FilO manufactured by Kikusha, F-113, F-120, F-812, F
-191, Nosurf on 5-111 manufactured by Asahi Glass A1
, S-112, S-113, Neostri's Sturgien) 100, 150, Noeftonop manufactured by Tohoku Fertilizer Co., Ltd. EF-102, EF-103, EF-112
, EF-1238, EF-123B, and the like. In addition to the above, cationic, anionic, and nonionic fluorosurfactants are available from Daikin Industries, Kanto Denka, Du Pont, ICI, Hoe.
CHST and CIBA-GEIGY, and these can also be used as the fluorosurfactant of the present invention.

In addition, the silicone surfactant used in the present invention has a polysiloxane as a hydrophobic group, a cationic hydrophilic group (e.g., quaternary ammonium base), a nonionic hydrophilic group (e.g., an alkylene oxide adduct, etc.), and a polysiloxane as a hydrophobic group. Such)
There are compounds having anionic hydrophilic groups (for example, sulfate ester salts, phosphate ester salts, carboxylate salts, etc.). In Japan, various products are commercially available from Toray Silicone ■, Shin-Etsu Silicone, Toshiba Silicone ■, etc., and these various products can be used in the present invention.

The amount of the shrinkage reducing agent of the present invention to be used varies depending on the number of carbon atoms in the alkyl group and the number of carbon atoms in the alkylene group of the compound represented by the general formula (1), but is usually 0.5 to 10
Weight%. If the amount used is less than 0.5% by weight, the effect of reducing shrinkage will be low, while if it exceeds 10% by weight, the strength of the cement composition will be about 2/3 or less than that without the additive, which is not sufficient for practical use. When the compound represented by the general formula (1) is used in combination with a fluorosurfactant and/or a silicone surfactant, the shrinkage reducing effect increases due to the synergistic effect. In this case, the amount of the compound represented by general formula (1) used is 0.3 to 10% by weight based on the cement, and the amount of the fluorosurfactant is 50% to 10% by weight based on the weight of the cement.
500 ppm, and the silicone surfactant is 0.05-1% by weight based on cement.

The means of adding the shrinkage reducing agent for cement of the present invention is the same as that for cement admixtures that are generally used, for example, by mixing an appropriate amount of the shrinkage reducing agent in the mixing water in advance, or by adding the shrinkage reducing agent to cement. It is possible to adopt measures such as adding an appropriate amount of the shrinkage reducing agent for the present cement during kneading of the mixture consisting of aggregate, water, and water.

The shrinkage reducing agent (C) of the present invention can be used in combination with other components (optional). Such optional ingredients include metal chlorides such as calcium chloride and sodium chloride, metal sulfates such as sodium sulfate, known cement hardening accelerators such as organic amines such as triethanolamine, alcohols, sugars, starch, and glycerin. , known cement hardening retardants such as sodium polyphosphate, known reinforcing steel rust preventive agents such as sodium nitrite and calcium nitrite, lignin sulfonic acid, oxycarboxylic acid, naphthalene sulfonic acid formalin condensate, melamine sulfonic acid formalin condensate. Various cement dispersants, known cement dispersants such as carboxymethyl cellulose, hydroxime, chill cellulose, hydroxyethyl cellulose, carboxymethyl starch, phosphorylated starch, and known cement thickening agents such as sodium alginate can be used.

The method for constructing mortar or concrete to which the shrinkage reducing agent of the present invention has been added may be the same as conventional methods, such as troweling, filling into formwork, spraying, or pouring with a caulking gun. Further, the curing method may be any of air dry curing, humid air curing, water curing, heating accelerated curing (steam curing, autoclave curing, etc.), or these methods may be used in combination.

When the shrinkage reducing agent of the present invention is added to cement,
Drying shrinkage can be significantly reduced compared to the case without additives. In addition, the nonflammability of the cement composition is less likely to be impaired, and furthermore, even when added in a high amount (for example, about several percent), the strength of the cement composition will not be significantly reduced.

Hereinafter, the present invention will be explained with reference to Examples, but the present invention is not limited thereto.

Example 1 Various acetylene alcohols, acetylene glycols, or oxide adducts and acetylene oxide adducts of these alcohols obtained by reacting acetylene with formaldehyde or ketone compounds in the presence of an alkali are used as shrinkage reducing agents for cement. I chose. Regarding the cured mortar obtained by adding these shrinkage reducing agents at a ratio of 3.5% by weight to cement as a pure component, JIS A
The shrinkage reduction rate was measured using the dial gauge method of 1129,
The strength was measured according to JIS R5201, and the results shown in Table 1 were obtained.

Moreover, the amount of mixed air was measured for concrete according to JIS A 112B.

In addition, in the case of the mortar whose shrinkage reduction rate and strength were measured, the water/cement ratio was 65% and the sand/cement ratio was 200%.
Met. In the case of concrete, unit cement amount 3
00kg/rI? , the water/cement ratio was 60%, and the fine aggregate ratio was 44%.

Moreover, EO in Table 1 represents ethylene oxide, and PO represents propylene oxide.

Margins below this page Table 1 (1) Table 1 (2) Example 2 A test was carried out in the same manner as in Example 1, using the shrinkage reducing agent positive 3 in Example 1 and changing the amount added. Action, Table-2
I got the result.

Margin table below this page-2 Example 3 Shrinkage reducing agents No. 3 in Example 1 were used at 2.0% by weight based on ordinary Portland cement, various fluorosurfactants were used at 200 ppm based on the cement, or silicone based A surfactant was used in an amount of 0.1% by weight based on the cement, and the shrinkage rate, air content, and strength were measured in the same manner as in Example 1, and the results shown in Table 3 were obtained.

Table 3 Example 4 Shrinkage reducing agent No. 11 of the present invention in Example 1 was used at 2.0% by weight based on the cement, Surflon S-141 was used as the fluorosurfactant, and SH3747 was used as the silicone surfactant. A test was conducted in the same manner as in Example 1 by changing the amount added, and the results shown in Table 4 were obtained.

Margin table below on this page - 4 Patent Applicant Nippon Cement Co., Ltd. Sanyo Chemical Industries Co., Ltd. Agent Patent Attorney Yasuhiro Koshi Procedural Amendment 4JH2, 1981 Kazuo Wakasugi, Commissioner of the Patent Office ':ta'
, Case 1, Indication of the case 1982 Patent Application No. 007088 2, Name of the invention Shrinkage reducing agent for cement 3, Relationship to the case by the person making the amendment Patent applicant Sanyo Riki Seikogyo Name (228) Sanyo Kasei Kogyo Co., Ltd. Company Nihon Name (4,19) Nippon Cement Co., Ltd. 4, Agent ■
601-i3 Tomi 075-571-11226, Table 1(2) on page 25 of the Detailed Description of the Invention column of the specification to be amended is amended as follows.

(1) Structural formula of Na13 in the table: %formula% Correct to.

(2) Structural formula of column 14 in the table: Correct to.

(3) Structural formula of column 15 in the table; to correct.

Claims (1)

[Claims] 18th general formula (1) R2, R3 are hydrogen or -)'alkyl groups having 1 to 8 carbon atoms, A is an alkylene group having 2 to 3 carbon atoms, and n is a number of O to 30 ) A shrinkage reducing agent for cement, comprising a water-soluble or self-water-dispersible acetylene alcohol compound. 2. In the general formula (1), the polyoxine alkylene group represented by Δ0)-n is a block-like or random-like coaddition group in which the molar ratio of oxyethylene group/oxypropylene group is at least 0°2. Claim 1
Shrinkage reducing agent for cement as described in . 3. In the general formula (1), R2 and R3 are hydrogen or an alkyl group having 1 to 4 carbon atoms, and the total number of carbon atoms of R2 and R3 is within the range of 0 to 10. Shrinkage reducing agent for cement 1- according to item 1 or 2. 4. In the general formula (1), the total number of carbon atoms of the alkyl groups R2 and R3 is 11 to 32, and at least two of the 11 carbon atoms are ethylene groups. Shrinkage reducing agent for senone 1- as described in . 5. The shrinkage reducing agent for cement according to claim 1 or 2, wherein in general formula (1), n is within the range of 2 to 10. 6. A shrinkage reducing agent for plastics, characterized by comprising a compound represented by the general formula (1) and a fluorine-based surfactant and/or a silicone-based surfactant. 7. The shrinkage reducing agent for cement according to claim 6, wherein the fluorosurfactant and/or the silicone surfactant are cationic or nonionic. 8. The shrinkage reducing agent for cement according to claim 6, wherein the fluorosurfactant and/or the silicone surfactant are nonionic.