JPS60195048A - Plasterer mortar - 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] [Field of Application of the Invention] The present invention provides a plastering mortar which has good workability and hardly causes cracks. Regarding.

[Prior art and its drawbacks]

Conventionally, plastering mortars containing various components have been known. For example, there are those that try to improve strength development by blending 7 calcium substances, those that reduce the occurrence of cracks by blending cement expansion agents, and those that improve workability by adding water bathing polymer substances. However, all of them have advantages and disadvantages, and none of them fully satisfies physical properties such as crack prevention.

On the other hand, recently, organic cement shrinkage reducing agents have been developed (for example, Japanese Patent Publication No. 59-6430, Japanese Patent Application Laid-Open No. 59-21557), and their application to plastering mortar is being considered. ing. However, mortar simply blended with such an organic compound has the drawbacks of poor plasticity (troweling) and insufficient improvement in crack prevention.

[Object of the present invention]

In order to develop the use of an organic cement shrinkage reducing agent, the inventor conducted various studies in order to solve the above-mentioned drawbacks when used in plastering mortar, and as a result, the inventor further developed the use of a cement expanding agent and an air-entraining surfactant. The inventors discovered that when the air content of the mortar was adjusted to 5 to 15%, the surprising effect of improving workability and anti-slip properties could not be obtained, leading to the completion of the present invention.

[Configuration of the present invention]

That is, the present invention contains an air-entraining surfactant, a seven-metal expansion agent, and at least one organic compound selected from the following general formulas [l] and [■], and has a glaze of 5 to 15 This is a plastering mortar characterized by the inclusion of % aerial scenery.

General formula % formula %) (wherein, R is the residue of a compound having n active hydrogens,
X is an oxyalkylene group having 6 to 4 carbon atoms, nxa=1
~10n, nXb=1~IQn, n=2~8,
It may be a random adduct or a block adduct) R+O(A○)mH・・・・・・・・・・・・［1）
(In the formula, R2 is an alkyl group having 1 to 7 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms, A is a 17 type or 2-glaze alkylene group having 2 to 2 carbon atoms, and m is a number from 1 to 10. ) Acts as a shrinkage reducer in plastering mortar. General formula El
The organic compound represented by , 1 is described in JP-A-59-21557. This compound can be easily obtained by adding ethylene oxide and zolotene oxide and/or butylene oxide in a random or block manner to a compound having 2 to 8 active hydrogen atoms.

Compounds having 2 to 8 active hydrogens include ethylene glycol, probile/glycol, neopentyl glycol, hexyne/glycol, glycerin, trimethylolpropylene, 1,3.5 pentanetriol, nrubitol, sorbitan, manonose, quinlose, Polyhydric alcohols such as crucose, fructose, sucrose, trehalose, ammonia, ethylenediamine,
Amines such as methylamine and ethylamine can be used.

Regarding the oxyalkylene group represented by X, the number of carbon atoms is 6
The reason for limiting the number of carbon atoms to 4 is that if a material with a carbon number of 5 or more is used, it will be difficult to soak in cement mixing water, and a large number of coarse air bubbles of 1 mm or more will be mixed into the plastering mortar, causing a decrease in strength. To become.

Further, ethylene oxide must be added to a compound having active hydrogen in an amount of 1 mole or more and 10 times the mole or less of active hydrogen, and the same applies to alkylene oxide having 3 to 4 carbon atoms.

If a and b are out of this range, a large number of coarse air bubbles will be mixed in during mortar mixing, the strength will be reduced, and the effect of preventing drying shrinkage will be small.

If ethylene glycol is used as a compound having active hydrogen, HO+(CpH+○)bl, Xal)C[(21Ckh
O+'rk2. (C2H40)b2-)-) (where a+a2=1~20°bl+
b2=1 to 20, including the case where either a or R2 is D. If a compound having six or more active hydrogen atoms, such as glycerin, is used, a compound shown in the following formula can be obtained.

CH20+xal, (02H40)bl+H" CH3-0-f-XR2, (C'2H40)b2-1-
HCH2-○+Xa3. (C2H40) b3+H Here, a1+a2+a3' ” 1~50 r b1+b
2+b3" 1 to 6D, and one or two of a A compound represented by the following formula is obtained.

Here, al+a2+a3+a4=1~40,
b1 + b2 + b3 + b4 = 1 ~ 40, al ~ a
1 to 6 out of 4 are 0. Cases in which 1 to 6 of b-b4 are O are also not included.

Next, the organic compound represented by the general formula El) will be explained. This organic compound is described, for example, in Japanese Patent Publication No. 59-6460. This product can be easily obtained by adding an alkylene oxide such as ethylene oxide and/or fluorobylene oxide to an alcohol having 7 or less carbon atoms.

Examples of R2 include methyl group, ethyl group, normal propyl group, isopropyl group, normal butyl group, isobutyl group, normal pentyl group, inpentyl group, nclope/thyl group, cyclohexyl group, normal hexyl group,
Isohexyl &, , , / includes a marhezotyl group and an isohebutyl group. Considering the cement shrinkage reducing effect of the stiff group, an alkyl group having 1 to 5 carbon atoms or a cyclohexyl group, particularly a butyl group, is preferable. In the case of an alkyl group having 8 or more carbon atoms, the solubility in water may decrease, the shrinkage reduction effect may decrease, and furthermore, if a large amount of alkylene oxide is attached to the alkyl group to the extent that it becomes sufficiently water-soluble, In this case, many coarse air bubbles, which are undesirable for plastering mortar, are mixed in and the strength is reduced.

A is an alkylene group having 2 to 6 carbon atoms, and may include an ethylene group and/or a propylene group. Further, m (number of moles of alkylene oxide) is 1 to 10. m is 1
If the alcohol content is less than that, the shrinkage reducing effect will be small when mixed with cement, and the alcohol will become extremely volatile, making it unusable. When m is more than 10, the effect of reducing shrinkage is small, and many coarse air bubbles are likely to be mixed in t7.

Examples of the organic compound represented by the general formula [■] include CH30÷C2H40+3H% CH30(-C3H60+IH% 02H50(-C2H,0-)IHl C)304-C3H60-), H.

C: 2H5+C2H40+rl-c3860→・4H
.

n　C3H70+c2H4,O+5H.

i-C,,H,70ze≧He0-hH.

I C3H70+C2H40 feet C3H60÷□H2n
C' a Hg 0(-C2H40+ 7 )], ]-
C4H90+C,1H60+H1 r+-C4HgO-C-C2H40-+7+03H60
Hln C3H110+C2H40±2H1i 0
5H11C)+c2B40tiC3H60÷2H.

1-C6J, o+c, H, o-)4H.

11 C7J50+C2H4M3H60÷5H11-C
7H150+c2H40+5Hzn -C6J 30+
C2H40-)-5H etc. can be opened.

The amount of at least one organic compound selected from the above general formulas [l] and [11] is 0.05 to 10% by weight, preferably 1 to 5% by weight, based on the cement content of the plastering mortar. . If the amount is less than 0.05 weight, the effect of reducing shrinkage will be smaller, and if the amount exceeds 10 weight, many coarse air bubbles will be mixed in, which is not preferable.

Next, the air-entraining surfactant used in the present invention is 5
This is necessary to stably mix in fine air of 0.00 microns or less. As examples, resin acid sodium salts, alkyl polyoxyethylene ethers, alkyl phenol polyoxyethylene ethers, polyoxyethylene esters of resin acids and resins, etc. can of course be used, but the most preferred is higher alcohol ether 1mM. It is an ester soda salt. The amount used is selected depending on the amount of air mixed into the mortar. Generally, 0.001 to 0.030 of the cement content of the mortar is used. In the present invention, the amount of air mixed into the mortar is determined by measuring the unit volume weight of the mortar immediately after the mortar has been kneaded, and managing the air amount by 1 - the theoretical volume weight of 0 air amount. It is necessary to set it as 5-15%. If the air content is less than 5%, the plastering mortar will have poor drainage properties, and if it exceeds 15%, it will be difficult to adhere to the wall.

The cement expanding agent is used to enhance the chatter-preventing effect of the plastering mortar to which the organic compound is added. Both the cement expanding agent and the above-mentioned organic compound have the effect of preventing mortar from warping, but
A sufficient effect cannot be obtained by adding too much. However, by using both together, it is impossible to obtain the effect of preventing the problem of: I+x<. As the cement expansion material, calcium sulfoaluminate threads, calcium aluminate and gypsum mixture threads, lime threads, etc. can be used. The spear used is 1 to 11% of the cement content of the mortar.
]j quantity ratio is preferable. Instead of using cement to which a cement expansion agent has been added, the same effect can be obtained by using expansion cement in which the expansion component of Sowara is mixed in advance during firing of the cement.

The above organic compounds, air-entraining surfactants, and cement expansion agents may be mixed in advance with plastering mortar components such as cement and aggregate, or may be added when the mortar is mixed. An example of the composition of Mo/L/Tal is as follows. Various boltland cements 10
01 parts by weight and 150 to 450 parts by weight of sand under 5 degrees are blended,
150-28 in JIS R5201 flow test
Boil the water so that it has a flow value of 0 mrn. Part of the cement can also be replaced with calcium carbonate, clay, etc.

[Example of the present invention]

Hereinafter, various mortars were kneaded using the mortar formulations shown in the Example Table, which will be explained in detail after opening the Examples, and the unit volume weight was measured to determine the amount of air contained in the mortar. Furthermore, when mortar with a thickness of 1 crn was applied to a concrete wall with a trowel, the condition of the troweling and the occurrence of cracks when the mortar was left indoors until 28 days later were observed. The results are shown in the table.

Note that the size of air contained in the mortar to which the air-entraining surfactant was added was all 500 microns or less.

Materials used> 1) Cement: Ordinary Portland cement 2) Sand: 5 mm thick from Sagami Yoyo 3) Cement expansion agent: Cal7umzalfo aluminate product name [Denka CSA
"20j' (Kame, manufactured by Ki Kagaku Kogyo ■) Lime thread "Onoda Expan" (manufactured by Onoda Cement ■) 4) Organic compounds: (A) HO + (C3H60) 7
1 (C2H40)3±H(B)CH30+C2H40
)3H (C) HO+(C4He O) 2 , (C2H40
) 1゜+H(D) C2H5 generation, H40÷1c3H6
o), H5) Air-entraining surfactant: Higher alcohol ether sodium sulfate polyoxyethylene nonylphenol ether [Effects of the present invention] According to the plastering mortar of the present invention, the workability of troweling is extremely good and there is no cracking. You can perform plastering work that rarely occurs. Moreover, since all the air contained in the mortar is fine, with a size of 500 microns or less, freeze-thaw resistance can also be improved.

Patent applicant Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] The glaze contains an air-entraining surfactant, a cement expansion group, and at least one organic compound selected from the following general formulas CD and (ll), and contains 5 to 15% air. Plastering mortar characterized by containing. General formula % formula % (wherein, R is the residue of a compound having n active hydrogens,
X is an oxalkylene group having 6 to 4 carbon atoms, and n x a
= 1~1, On, n x b = 1~10
n, n = 2 to 8, and may be a random addition or a block attachment) I(20(AO)mI(......
...... species or two alkylene/groups, m is a number from 1 to 10)