KR20110082858A

KR20110082858A - Additive composition of skim coat mortar and skim coat mortar composition having the additive composition

Info

Publication number: KR20110082858A
Application number: KR1020100002768A
Authority: KR
Inventors: 강진규; 김태홍
Original assignee: 삼성정밀화학 주식회사
Priority date: 2010-01-12
Filing date: 2010-01-12
Publication date: 2011-07-20
Also published as: WO2011087262A3; WO2011087262A2

Abstract

PURPOSE: An additive composition of skim coat mortar is provided to improve water retention and workability when applied to skim coat mortar and to reduce the consumption of paint in the finishing process using paints after skim coat mortar construction. CONSTITUTION: An additive composition of skim coat mortar comprises cellulose ether and at least one kind of co-additives. The co-additives comprise at least one kind selected from the group consisting of starch, air entraining agent, surfactant, and dispersant. The cellulose ether comprises at least one kind selected from the group consisting of methylcellulose, hydroxyethyl methyl cellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose and ethylhydroxyethylcellulose.

Description

Additive composition of skim coat mortar and skim coat mortar composition having the additive composition

An additive composition of a scheme coat mortar and a scheme coat mortar composition comprising the additive composition are disclosed. More specifically, an additive composition of a scheme coat mortar comprising a cellulose ether and at least one auxiliary additive and a scheme coat mortar composition comprising the additive composition are disclosed.

Cement mortar is a type made by mixing cement, aggregate and other admixtures with water, and is classified into tile cement mortar, cement plaster, skim coat mortar, and general mortar depending on the purpose.

Skim coat mortar refers to a back cement based finish used in building structures. That is, such a skim coat mortar includes white cement and limestone as main raw materials, and is mainly used in high temperature and high humidity areas. In addition, the skim coat mortar is mainly constructed with a thickness of 1 to 3mm on the inner, outer walls and ceiling of the building, and finishes only with the curing of the skim coat mortar after construction, or finishes by coating paint on the cured skim coat mortar. do.

When finished with paint, the consumption of paint is closely related to the water absorption rate of the cured skim-coated mortar. Accordingly, the water absorption of the skim coat after curing has become a major evaluation item that is a measure of the paint consumption.

In addition, a cellulose ether such as methyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose or ethyl hydroxyethyl cellulose is added to the scheme coat mortar, thereby improving workability and water retention. And water absorption rate reduction.

However, the following problems arise when cellulose ether is used alone in a skim coat mortar:

(1) When low-viscosity cellulose ether is used alone in the skim coat mortar, the water viscosity improvement effect is insufficient due to the low viscosity, resulting in problems such as workability, working time and strength of the skim coat mortar. In this case, there is a fear that the dry-out of the skim coat mortar proceeds rapidly in a high temperature and high humidity region, and a crack may occur on the surface.

(2) When high viscosity cellulose ether is used alone in the skim coat mortar, the water retainability of the skim coat mortar is excellent, but workability may be degraded due to skinning phenomenon in which a film is formed on the surface of the skim coat mortar.

(3) In general, when cellulose ether is used alone in the skim coat mortar, adhesion to the working surface is improved due to the improvement in water retention, but large pores of 1 mm or more are formed in the skim coat mortar, thereby deteriorating water absorption characteristics. There is this.

Accordingly, there is a need for development of an additive composition of cellulose ether-based scheme coat mortar to solve the problem of using cellulose ether alone in a scheme coat mortar.

One embodiment of the present invention provides an additive composition of a scheme coat mortar comprising cellulose ether and at least one auxiliary additive.

Another embodiment of the present invention provides a Schemecoat mortar composition comprising the additive composition.

One aspect of the invention,

Cellulose ether and at least one auxiliary additive,

The auxiliary additive provides an additive composition of a skim coat mortar comprising at least one selected from the group consisting of starch, air entrainer, surfactant and dispersant.

The cellulose ether may include at least one selected from the group consisting of methyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and ethyl hydroxyethyl cellulose.

The viscosity of the 2% by weight aqueous solution of cellulose ether, the value measured at 20 ℃ and 20rpm using a Brookfield viscometer may be 10,000 ~ 100,000cps.

The starch may include at least one selected from the group consisting of general starch and modified starch.

The viscosity of the 10% by weight aqueous solution of the starch, the value measured at 20 ℃ and 20rpm using a Brookfield viscometer may be 2,000 ~ 8,000cps.

The viscosity of the 10% by weight aqueous solution of the modified starch, the value measured at 20 ℃ and 20rpm using a Brookfield viscometer may be 5,000 ~ 13,000cps.

The starch content may be 5 to 30 parts by weight based on 100 parts by weight of the cellulose ether.

The air entrainer may include lauryl ethylene sodium sulfate (SLES: Sodium Lauryl Ethylene Sulfate) which is a petroleum surfactant component.

The HLB value of the lauryl ethylene sodium sulfate may be 9-14.

The content of the air entrainer may be 1 to 10 parts by weight based on 100 parts by weight of the cellulose ether.

The surfactant may include at least one selected from the group consisting of anionic surfactants and nonionic surfactants.

The anionic surfactant may include at least one member selected from the group consisting of sulfonates, sulfates, esters, amino acids, and soaps.

The nonionic surfactant may include at least one selected from the group consisting of ethoxylated compounds, alkanolamides, esters of polyhydroxyl compounds, ethylene oxide-propylene oxide block copolymers, and amine oxides. .

The content of the surfactant may be 1 to 10 parts by weight based on 100 parts by weight of the cellulose ether.

The dispersant may include at least one selected from the group consisting of a high performance AE water reducing agent and a high performance water reducing agent.

The content of the dispersant may be 1 to 30 parts by weight based on 100 parts by weight of the cellulose ether.

Another aspect of the invention,

Back cement; And

It provides a Schemecoat mortar composition comprising the additive composition.

The content of the additive composition may be 0.01 to 10 parts by weight based on 100 parts by weight of the back cement.

According to one embodiment of the present invention, by including the cellulose ether and at least one auxiliary additive, when applied to the skim coat mortar, to improve the water retention, workability and working time, and to reduce the water absorption rate of the construction of the skim coat mortar An additive composition of schemecoat mortar can be provided that can reduce the consumption of paint when finishing with post paint.

According to another embodiment of the present invention, a skim coat mortar composition including the additive composition may be provided to enable a clean finish.

Hereinafter, an additive composition of a skim coat mortar according to an embodiment of the present invention will be described in detail.

The additive composition of the skim coat mortar according to an embodiment of the present invention comprises a cellulose ether and at least one auxiliary additive, and the auxiliary additive is at least one selected from the group consisting of starch, air entrainer, surfactant, and dispersant. It includes. In the present specification, 'cellulose ether' means cellulose ether and / or derivatives thereof.

The viscosity of the aqueous solution of 2% by weight of cellulose ether may be 10,000-100,000 cps as measured at 20 ° C. and 20 rpm using a Brookfield viscometer. If the viscosity is less than 10,000 cps, the repair rate is insufficient in the normal use range and the thickening effect is insignificant. If the viscosity exceeds 100,000 cps, the water retention is improved but the workability of the skim coat paste may be deteriorated. In the present specification, the 'schemecoat paste' refers to a mixture obtained by mixing the additive composition, the back cement, the limestone, and the like of the scheme coat mortar with water at a predetermined ratio.

The starch has a lower viscosity than the cellulose ether, thereby suppressing the introduction of air of 1 mm or more, thereby improving water retention and workability of the skim coat paste. Such starch may include at least one member selected from the group consisting of general starch and modified starch. The starch may include, for example, corn starch, potato starch, corn modified starch and / or potato modified starch.

The viscosity of the 10% by weight aqueous solution of the starch, the value measured at 20 ℃ and 20rpm using a Brookfield viscometer may be 2,000 ~ 8,000cps. If the viscosity is less than 2,000 cps, the adhesion to the working surface is reduced due to the stickiness of the skim coat paste, which is not preferable. If the viscosity exceeds 8,000 cps, the workability is increased due to the increase of the adhesion of the skim coat paste. Not preferred.

In addition, the viscosity of the 10% by weight aqueous solution of the modified starch, the value measured at 20 ℃ and 20rpm using a Brookfield viscometer may be 5,000 ~ 13,000cps. If the viscosity is less than 5,000 cps, the adhesive force to the working surface due to the adhesion of the skim paste is lowered, which is not preferable. If the viscosity exceeds 13,000 cps, the workability is increased due to the increase of the adhesion of the skim coat paste. not.

In addition, the content of the starch may be 5 to 30 parts by weight based on 100 parts by weight of the cellulose ether. If the content of the starch is less than 5 parts by weight based on 100 parts by weight of the cellulose ether, the workability improvement effect of the skim coat paste is insignificant. It is not preferable because the adhesive strength of is lowered.

The air entrainer improves workability and reduces water absorption of the skim coat paste by forming micropores in micron (μm) units in the skim coat paste, but does not affect the workable time. Such an air entrainer may include sodium lauryl ethylene sulphate (SLES), which is a petroleum surfactant component.

The hydrophilic-lipophilic balance (HLB) value of the lauryl ethylene sodium sulfate may be 9-14. If the HLB value is less than 9, the lipophilic property is strong, so that it is not sufficiently dissolved in the scheme coat paste, and it is not preferable.

In addition, the content of the air entrainer may be 1 to 10 parts by weight based on 100 parts by weight of the cellulose ether. If the content of the air entrainer is less than 1 part by weight with respect to 100 parts by weight of the cellulose ether, the workability improvement effect is insignificant, and if it is more than 10 parts by weight, too many micropores in the micron unit is formed to increase the water absorption rate. Not preferred.

The surfactant may include at least one selected from the group consisting of anionic surfactants and nonionic surfactants. Here, the anionic surfactant may include at least one selected from the group consisting of sulfonates, sulfates, esters, amino acids, and soaps, and the nonionic surfactants may be ethoxylated compounds or alka. It may include at least one selected from the group consisting of nolvamides, esters of polyhydroxyl compounds, ethylene oxide-propylene oxide block copolymers and amine oxides.

In addition, the amount of the surfactant may be 1 to 10 parts by weight based on 100 parts by weight of the cellulose ether. If the content of the surfactant is less than 1 part by weight with respect to 100 parts by weight of the cellulose ether, it is not preferable because it does not exhibit the effect of the surfactant activity in the skim coat paste, and if it exceeds 10 parts by weight, a large amount of pores are formed in the skim coat paste and water It is not preferable because the absorption rate is increased.

The dispersant disperses the constituent particles of the scheme coat mortar composition to improve the workability and the run time of the scheme coat paste. Such a dispersant may include at least one selected from the group consisting of a high performance AE water reducer and a high performance water reducer.

In addition, the content of the dispersant may be 1 to 30 parts by weight based on 100 parts by weight of the cellulose ether. If the content of the dispersant is less than 1 part by weight based on 100 parts by weight of the cellulose ether, the components of the scheme coat paste are not sufficiently dispersed, and if the content of the dispersant is more than 30 parts by weight, the water demand of the scheme coat paste is excessively reduced. Not.

On the other hand, one embodiment of the present invention provides a skim coat mortar composition comprising a back cement and an additive composition of the skim coat mortar. Such scheme coat mortar compositions may further comprise limestone and slaked lime.

In addition, the content of the additive composition in the skim coat mortar composition may be 0.01 to 10 parts by weight based on 100 parts by weight of the cement. If the content of the additive composition is less than 0.01 parts by weight with respect to 100 parts by weight of the cement cement, water retention is not secured, and workability and working time are shortened, which is undesirable. If the content is more than 10 parts by weight, the hydration of cement is excessively lowered. Not desirable Schemecoat paste can be prepared by adding a predetermined amount of water to such a schemecoat mortar composition and kneading in a constant manner. In this case, water is added in an amount sufficient to ensure the workability of the conventional skim coat paste.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these embodiments.

Example 1-1 to 1-8 and Comparative example 1-1: Scheme Coat Preparation of the Additive Composition of Mortar

Cellulose ethers, starches, air entrainers and dispersants were mixed in the proportions shown in Table 1 below to prepare additive compositions for the scheme coat mortar.

division Composition (parts by weight) of the additive composition of the scheme coat mortar Cellulose ether ^{* 1} Starch Air entrainer ^{* 4} Dispersant ^{* 5}
Surfactant ^{* 6}
A ^{* 2} A ^{* 3} Example 1-1 92 8 0 0 0 0 Example 1-2 98 0 0 2 0 0 Example 1-3 83 8 0 2 0 0 Example 1-4 78 0 20 2 0 0 Examples 1-5 87 8 0 3 2 0 Example 1-6 76 0 20 2 2 0 Example 1-7 86 8 0 2 2 2 Example 1-8 76 0 20 2 2 2 Comparative Example 1-1 100 0 0 0 0 0

* 1: hydroxyethyl methyl cellulose (Mescelose EMA-70U, Samsung Fine Chemicals Co., Ltd., viscosity of 2% by weight aqueous solution measured at 20 ° C and 20 rpm with Brookfield viscometer 60,000 cps)

* 2: Corn starch (10 wt% aqueous solution viscosity 5,000 cps measured at 20 ° C. and 20 rpm with Brookfield viscometer)

* 3: Corn modified starch (10 wt% aqueous solution viscosity 9,000 cps measured at 20 ° C. and 20 rpm with Brookfield viscometer)

* 4: Air entrainer (WINFLOW-AE100, WinFlo: HLB = 12)

* 5: High performance water reducer (Egonex MEGAPA NN 99-PR: delayed high performance water reducer from Igan Industries)

* 6: Surfactant (sulfonate type anionic surfactant, Coreum OS-125, concentrating)

Example 2-1 to 2-8 and Comparative example 2-1: Scheme Coat Manufacture of mortar

Manufacturing example One: Scheme Coat Preparation of Mortar Composition

Back cement (Union, Inc.), limestone and slaked lime were mixed in a weight ratio of 30: 65: 5. Subsequently, one of the additive compositions of the scheme coat mortar prepared above was added to 0.4 parts by weight with respect to 100 parts by weight of the cement mixture to prepare a scheme coat mortar composition.

Manufacturing example 2: Scheme Coat Preparation of the paste

Water was poured into each of the sample coat mortar composition samples prepared in Preparation Example 1, followed by mixing for 3 minutes using a mechanical mixer to prepare a scheme coat paste. At this time, water was added in an appropriate amount so that each scheme coat paste had the same viscosity (450 ± 50 kcps).

Evaluation example

The physical properties of the respective scheme coat pastes prepared in Examples 2-1 to 2-8 and Comparative Examples 2 to 1 were evaluated in the following manner, and the evaluation results are shown in Table 2 below.

(1) water usage

Water was added so that the Brookfield viscosity (@ 20 ° C. and 20 rpm) of the Schemecoat paste was 450 ± 50kcps, and the total amount of water added was expressed as a percentage of the total amount of the Schemecoat mortar composition, which was used as water usage.

(2) conservatism

The water retainability of each of the above scheme coat pastes was measured according to EN 18555.

(3) workability

After applying the prepared skim paste paste on the concrete surface, it was quantified by a five-point method by evaluating whether the trowel was pushed well without resistance while spreading thinly with the trowel. Higher scores indicate better workability.

(4) pot life

The workability evaluation was carried out in units of 30 minutes, and the immediately preceding time at which the workability indicated by the five-point method fell below 3 points was defined as the workable time.

(5) water absorption

Measured by Karsten tube penetration test method, the smaller the water absorption rate is advantageous because the less paint consumption at the finish.

division Performance of Schemecoat Paste Water usage
(weight%) Water retention (wt%) Workability Working time Water absorption
(Ml / hr) Example 2-1 38.5 97.5 3.7 ○ 2.7 Example 2-2 37.5 97.8 4.0 △ 2.7 Example 2-3 37.5 98.2 4.2 ○ 2.5 Examples 2-4 37.5 97.9 4.1 ○ 2.3 Example 2-5 38.0 98.5 4.5 ◎ 2.4 Example 2-6 37.5 98.3 4.3 ◎ 2.2 Example 2-7 38.0 98.3 4.3 ◎ 2.4 Example 2-8 37.5 98.1 4.3 ◎ 2.2 Comparative Example 2-1 38.0 97.0 3.7 △ 2.8

Referring to Table 2, the skim coat pastes prepared in Examples 2-1 to 2-8 have at least one physical property of water retainability, workability, and workable time, compared to the skim coat pastes prepared in Comparative Example 2-1. It was found to be excellent, and the water absorption rate was low.

Although the present invention has been described with reference to the examples, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims

Cellulose ether and at least one auxiliary additive,
The auxiliary additive is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of starch, air entrainer, surfactant and dispersant.

The method of claim 1,
The cellulose ether is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of methyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and ethyl hydroxyethyl cellulose.

The method of claim 1,
The viscosity of the aqueous solution of 2% by weight of the cellulose ether, the additive composition of the skim coat mortar is 10,000 ~ 100,000cps value measured at 20 ℃ and 20rpm using a Brookfield viscometer.

The method of claim 1,
The starch is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of general starch and modified starch.

The method of claim 4, wherein
The viscosity of the 10% by weight aqueous solution of the starch, the additive composition of the Schottcoat mortar is a value of 2,000 ~ 8,000cps measured at 20 ℃ and 20rpm using a Brookfield viscometer.

The method of claim 4, wherein
The viscosity of the aqueous solution of 10% by weight of modified starch, the additive composition of the Schottcoat mortar is a value of 5,000 ~ 13,000cps measured at 20 ℃ and 20rpm using a Brookfield viscometer.

The method of claim 1,
The content of the starch is additive composition of the Schemecoat mortar is 5 to 30 parts by weight based on 100 parts by weight of the cellulose ether.

The method of claim 1,
The air entrainer additive composition of the Schottcoat mortar containing lauryl ethylene sodium sulfate (SLES: Sodium Lauryl Ethylene Sulfate) which is a petroleum surfactant component.

The method of claim 4, wherein
The additive composition of the Schottcoat mortar of the HLB value of the lauryl ethylene sodium sulfate is 9-14.

The method of claim 1,
The additive composition of the skim coat mortar is the content of the air entrainer is 1 to 10 parts by weight based on 100 parts by weight of the cellulose ether.

The method of claim 1,
The surfactant is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of anionic surfactants and nonionic surfactants.

The method of claim 11,
The anionic surfactant is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of sulfonates, sulfates, esters, amino acids and soaps.

The method of claim 11,
The nonionic surfactant is a skim coat comprising at least one selected from the group consisting of ethoxylated compounds, alkanolamides, esters of polyhydroxyl compounds, ethylene oxide-propylene oxide block copolymers and amine oxides. Additive composition of mortar.

The method of claim 1,
The content of the surfactant is 1 to 10 parts by weight of the additive composition of the skim coat mortar with respect to 100 parts by weight of the cellulose ether.

The method of claim 1,
The dispersant is an additive composition of a skim coat mortar comprising at least one selected from the group consisting of a high performance AE water reducing agent and a high performance water reducing agent.

The method of claim 1,
The content of the dispersant is 1-30 parts by weight of the additive composition of the skim coat mortar with respect to 100 parts by weight of the cellulose ether.

Back cement; And
Schemecoat mortar composition comprising the additive composition according to any one of claims 1 to 16.

The method of claim 17,
The content of the additive composition is a skim coat mortar composition of 0.01 to 10 parts by weight based on 100 parts by weight of the cement.