JP2005281036A - Polymer cement-based mortar for use in tile joint and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide such a polymer cement-based mortar for use for tile joints by using a polymer for mixing to a cement and having a high distortion-following ability and also having both the waterproofness and air permeability, and to provide an economical manufacturing method therefor. <P>SOLUTION: The polymer cement-based mortar for use in tile joints contains an ultra rapid hardening cement, a polyacrylate polymer, a cotton-like fiber and a surfactant-based frothing agent and is characterized in that a glass transition temperature of the polyacrylate polymer is not higher than -20°C, a polymer cement ratio (solid contents) of the polyacrylate polymer and the ultra rapid hardening cement is in the range of 20-80%, and 100 pts.wt. of the sum total of the ultra rapid hardening cement and a fine aggregate contain 0.1-5.0 pts.wt. of the surfactant-based frothing agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polymer cement tile joint mortar and a method for producing the same, and more particularly to a joint mortar for filling a space between building materials such as tiles and stones that are pressure-bonded to a concrete wall surface, and the like. The present invention relates to a polymer cement tile joint mortar having tempering and a method for producing the same.

  Conventional tile joint mortars are cement mortar based on a mixture of cement and fine aggregate as a main component, cement, fine aggregate, cement dispersion polymer dispersion or re-emulsified powder resin (hereinafter referred to as cement admixture polymer). Polymer cement mortar systems mixed with have been used.

  However, these conventional cement mortar and polymer cement tile joint mortars are less adaptable to expansion and contraction due to external environmental factors such as tiles and stones, and the joint materials themselves are cracked and tiled. As a result, the edge between the building material such as stone or stone and the joint material is generated, and the stress relaxation performance, deformation following performance, adhesion performance, and waterproof performance required for the joint material cannot be sufficiently exhibited.

  In addition, in order to improve the deformation followability of the polymer cement mortar, studies on elastic polymer emulsions and studies to increase the amount of cement-mixing polymer used have been conducted. In view of this point, for example, JP-A-8-239882 In addition, an elastic polymer cement mortar composed of an elastic polymer emulsion, cement, and aggregate is disclosed as a mortar for undercoating, intermediate coating, and pasting to tiles on an outer wall base of a concrete building. Furthermore, Japanese Patent Laid-Open No. 2000-203916 discloses a material in which a polymer emulsion having a glass transition temperature of −20 ° C. or less and a powder mixture containing 1 to 100% by weight of cement are mixed as main constituent materials. A molded plate using a cement-based material in which the solid content of the polymer emulsion with respect to the powder mixture is 30 to 120% by weight is disclosed.

  However, increasing the amount of cement-mixing polymer forms a large amount of polymer film on the surface of the mortar, which improves water resistance but reduces air permeability. Thus, sufficient strength cannot be obtained. In addition, rainwater or the like enters between the joint material and the base or tile after curing, resulting in a decrease in adhesion, and the possibility of floating or peeling due to freezing and thawing in cold regions, etc. There is a problem that existence promotes the occurrence of efflorescence.

An object of the present invention is a polymer cement-based tile joint mortar using a cement-mixing polymer, and has a combination of stress relaxation, deformation followability, adhesion, waterproofness and air permeability at the same time. Is to provide mortar.
That is, the object is to provide a polymer cement tile joint mortar that can simultaneously satisfy the strength development, stress relaxation performance, deformation follow-up performance, adhesion performance, waterproof performance and air permeability performance required for joint materials.

  Another object of the present invention is to provide a method by which the polymer cement tile joint mortar of the present invention can be easily and economically produced without using an expensive material.

In order to solve the above-mentioned problems, the inventors of the present invention have realized that the mortar having a specific constituent added with a surfactant-based foaming agent retains the flexibility of the cement-mixing polymer while maintaining air permeability and waterproofness. The present invention has been found to be excellent in balance, and the present invention has been achieved.
That is, the polymer cement-based tile joint mortar of the present invention includes a super-hard cement, a polyacrylate polymer, a cotton-like fiber, a surfactant foaming agent, and a fine aggregate, and the polymer cement (solid Min) The ratio is 20 to 80%, and the surfactant-based foaming agent is blended at a ratio of 0.1 to 5.0 parts by weight with respect to 100 parts by weight of the super-hard cement and fine aggregate. It is characterized by being.

  Preferably, in the polymer cement tile joint mortar of the present invention, the polyacrylic acid ester polymer has a glass transition temperature of −20 ° C. or less, and more preferably, the super fast cement and the fine aggregate. The cotton fiber is contained in an amount of 0.1 to 5.0 parts by weight with respect to a total of 100 parts by weight.

  The method for producing the polymer cement-based tile joint mortar according to the present invention is a super fast cement, a polyacrylate polymer, a cotton-like fiber, and a surfactant. When kneading, a surfactant foaming agent is previously added to the polyacrylate polymer dispersion.

The polymer cement tile joint mortar of the present invention is adaptable to expansion and contraction due to external environmental factors of building materials such as tiles and stones, and cracks of joint materials themselves, building materials such as tiles and stones, etc. It has excellent stress relaxation performance, deformation follow-up performance, adhesion performance, waterproof performance and air permeability without causing edge breakage with joint materials, and can maintain aesthetic performance for a long time, and it is inexpensive and economical. It is advantageous.
Moreover, the manufacturing method of the polymer cement type tile joint mortar of this invention makes it possible to manufacture the said polymer cement type tile joint mortar of this invention efficiently, economically, and simply.

The polymer cement-based tile joint mortar of the present invention contains a super fast cement, a polyacrylate polymer, a cotton-like fiber, and a surfactant-based foaming agent, and the cement polymer (solid content) ratio is 20 to 20%. At 80%, the surfactant-based foaming agent is blended at a ratio of 0.1 to 5.0 parts by weight with respect to 100 parts by weight of cement.
By setting it as such a structure, it can be set as the polymer cement type tile joint mortar which has the said effect with favorable high deformation | transformation followability, high air permeability, waterproofness, etc.

  Examples of the ultrafast hard cement that can be used in the polymer cement tile joint mortar of the present invention include calcium aluminate, calcium sulfoaluminate, and calcium fluoroaluminate cements.

These ultrafast cements have a compressive strength of 4 × 4 × 16 cm specimens prepared in accordance with JIS R 5201 “Physical test method of cement—strength test”, 5 N / mm ² or more in 3 hours after kneading, Preferably, a material having a density of 10 N / mm ² or more can be used.

  Portland cement has a slower cement hydration reaction up to the first day of age than super-hard cement, and polymers such as cement admixtures or surfactants contained therein are used for polymer cement tile joints. When mixed with mortar, the hydration reaction of the cement is delayed due to the influence of these additives, only the film formation of the polymer film by the drying of the mortar surface proceeds first, the inside becomes uncured, As a result, cracking of the mortar and sufficient strength cannot be obtained.

As the polymer for admixing cement that can be used in the polymer cement-based tile joint mortar of the present invention, a liquid polymer emulsion, rubber latex, powdered re-emulsified powder resin, or the like can be used. In particular, when using a re-emulsified powder resin, there is no need for on-site weighing, and quality control becomes easy.
As these admixture polymers, polyacrylic acid ester exemplified in JIS A 6203, styrene butadiene, ethylene vinyl acetate, vinyl acetate / versaic acid vinyl ester, vinyl acetate / vinyl versatate / acrylic acid ester and the like are the main components. Examples thereof include polymer dispersions and re-emulsifying powder resins, which can be used alone or in combination. Particularly preferably, an acrylic acid polymer can be used.

  These admixing polymers are used mainly for the purpose of imparting deformation following performance to the resulting polymer cement tile joint mortar. The deformation follow-up performance, that is, the flexibility performance is greatly different at the environmental temperature. Usually, the tensile strength is increased at the low temperature, but the elastic modulus is increased at the same time.

  The deformation follow-up performance of the polymer cement-based tile joint mortar largely depends on the glass transition temperature of the admixing polymer, and the glass transition temperature as the admixing polymer that can be mixed with the polymer cement-based tile joint mortar in the present invention is: What is -20 degrees C or less can be used, Preferably it is -20--60 degreeC, More preferably, it is -20--50 degreeC.

  The admixing polymer is desirably added and mixed so that the polymer cement (solid content) ratio is 20 to 80%, preferably 20 to 60%. This is because the air permeability of the polymer cement-based tile joint mortar can be secured within such a range.

  Further, as the surfactant-based foaming agent that can be used in the polymer cement-based tile joint mortar of the present invention, various synthetic surfactants such as anionic, cationic, amphoteric surfactants, nonionic surfactants, etc. And natural surfactants can be used. For example, as an anionic surfactant, carboxylate, sulfate ester, sulfonate, phosphate ester salt, and as a cationic surfactant, primary amine salt, secondary amine salt, tertiary Examples of amine salts, quaternary ammonium salts, and amphoteric surfactants include amino acid type, betaine type, and nonionic surfactants such as polyethylene glycol type and polyhydric alcohol type. Natural surfactants Examples thereof include keratin hydrolyzate and collagen hydrolyzate, and these can be used alone or in combination.

These surfactant-based foaming agents can provide high air permeability while maintaining waterproofness by introducing fine bubbles into the mortar for polymer cement tile joints by the foaming agent component. Since sufficient strength required for the joint material can be obtained and the occurrence of floating, peeling, and efflorescence due to the entry of rainwater or the like to the ground can be suppressed, the aesthetic performance can be sufficiently satisfied.
As the mixing amount of the surfactant-based foaming agent, 0.1 to 5.0 parts by weight is desirably mixed with respect to a total of 100 parts by weight of the super fast hard cement and the fine aggregate. If the amount is less than 0.1 parts by weight, the air permeability is low, which affects the strength development after one day, and if it exceeds 5.0 parts by weight, the waterproof performance may be deteriorated.

  The fibers of the cotton-like fibers that can be used in the polymer cement-based tile joint mortar of the present invention include polyolefin fibers, polyvinyl alcohol fibers, aramid fibers, polyamide fibers, polyester fibers, and polyacrylonitrile fibers. Fibers such as fibers, cellulosic fibers, ceramic fibers, carbon fibers, glass fibers, and mineral fibers can be used alone or in combination. Although the fiber diameter and the fiber length of these fibers are not particularly limited, the sagging property can be further improved by suitably using a fiber diameter of 20 μm or less and a fiber length of 2000 μm or less.

The shape of these fibers can be cotton-like, and this increases the entanglement between the fibers, and the entanglement between the fibers and other components, resulting in a cotton-like shape in terms of improving thixotropy and sagging properties. This is because it is preferable.
The blending amount of the cotton-like fiber is preferably 0.1 to 5.0 parts by weight with respect to a total of 100 parts by weight of the ultrafast cement and fine aggregate. This is because the sagging at the time of mortar construction can be sufficiently suppressed without lowering the workability of the mortar, and the waterproof performance becomes better.

In addition, the ultrafast cement used in the present invention includes blast furnace slag powder, fly ash, silica fume, limestone powder, quartz, which is a material having pozzolanic activity, in order to improve long-term strength, relieve shrinkage, and prevent occurrence of cracks, etc. Known admixtures that can be mixed with cement such as powder, dihydrate gypsum, hemihydrate gypsum, type I, type II and type III anhydrous gypsum can be blended alone or in combination. .
Furthermore, other known chemical admixtures such as thickeners and water reducing agents can be added as needed.

  Furthermore, among the other components that can be blended in the polymer cement tile joint mortar of the present invention, as fine aggregate, river sand, mountain sand, land sand, crushed sand, sea sand, silica sand Nos. 6-7, etc. Fine aggregates having a relatively small particle diameter, or fine powders such as quartzite powder and limestone powder can be used. The blending amount of these fine aggregates is usually 50 to 400 parts by weight, preferably 100 to 200 parts by weight with respect to 100 parts by weight of cement.

  The polymer cement-based tile joint mortar of the present invention comprises the above-mentioned super-fast hard cement, cement-mixing polymer, surfactant-based foaming agent, cotton-like fiber, aggregate and water, and if necessary, the above-mentioned known admixture. However, the mixing method is not particularly limited, and a part of the material may be mixed in advance, and all materials may be used at the same time on site. You may mix.

  Preferably, a surfactant foaming agent may be added to the polyacrylate polymer dispersion in advance when kneading the ultrafast cement, the polyacrylate polymer, the cotton-like fiber and the surfactant. In order to ensure air permeability, air bubbles are contained in the obtained mortar.

When a re-emulsifying resin is used, the amount of kneading water can be changed depending on the type and blending of the materials used, so it is not uniquely determined, but usually 15 to 80% in terms of water / cement ratio. Is preferable, and 20 to 50% is particularly preferable. By blending water in such a range, sufficient workability and sufficient strength development will be obtained.
In addition to the above kneaded water, the water used for calculating the water / cement ratio in the present invention includes water contained in these when the admixing polymer is used as a polymer dispersion such as a polymer latex or a resin emulsion. Is also included.

  The polymer cement tile joint mortar of the present invention thus obtained is an ultrafast cement, cotton-like fiber, especially a cement admixture polymer having a glass transition temperature of -20 ° C. or lower, and a surfactant foaming agent. By obtaining the polymer cement mortar by using, it is possible to have deformation followability, adhesion, waterproofness and air permeability at the same time, and good strength expression can be obtained.

Hereinafter, the present invention will be described in detail with reference to the following examples, comparative examples and test examples.
(Examples 1-5, Comparative Examples 1-8)
Using the raw materials shown in Table 1, the materials were kneaded at the blending ratios shown in Tables 2 and 3, and polymer cement mortar for tile joints was prepared. However, a surfactant foaming agent added in advance to a polyacrylate polymer dispersion was used.

上記表中、スミシールドＡは、硫酸エステル塩系アニオン界面活性剤である。

In the above table, Sumishield A is a sulfate ester anionic surfactant.

(Test Example 1: Follow-up evaluation)
Using each polymer cement-based tile joint mortar obtained in Examples 1 to 5 and Comparative Examples 1 to 8, in accordance with “Crack followability test method for surface coating material (JSCE-K532-1999)”, Using the standard state test specimen, the elongation at the time of showing the maximum tensile strength at the age of 28 days was measured, and the results are shown in Tables 4 and 5.
Moreover, as an evaluation of the measurement results, those having an elongation of 0.4 mm or more are judged to have sufficient follow-up performance, and the results expressed by the following evaluation methods are also shown in Tables 4 and 5, respectively.
○: 0.4 mm or more ×; less than 0.4 mm

(Test Example 2: waterproof evaluation)
Using each polymer cement-based tile joint mortar obtained in Examples 1 to 5 and Comparative Examples 1 to 8, in accordance with “Water Permeability Test Method for Surface Coating Material (JSCE-K532-1999)”, each Test specimens were prepared, the water permeability was measured, and the results are shown in Tables 4 and 5.
Moreover, as evaluation of the said measurement result, it judges that it has sufficient waterproof performance, when the water permeation amount is 0.5 ml / h or less, and the result represented with the following evaluation methods is also shown in Table 4 and Table 5, respectively.
○: 0.5 ml / h or less ×: When exceeding 0.5 ml / h

(Test Example 3; air permeability evaluation)
Each polymer cement-based tile joint mortar obtained in Examples 1 to 5 and Comparative Examples 1 to 8 is molded into a 10 × 10 × 1.5 cm mold, and the temperature is 20 ° C. and the humidity is 60% RH. , A constant absolute load pressure (P2) is applied to each specimen obtained by curing for 28 days, and the air quantity is measured by a constant pressure method for measuring the air quantity permeating through each specimen. The air permeability coefficient is calculated from the following formula from the obtained air amount, and the results are shown in Tables 4 and 5.
K = 2dηP ₁ Q / {(P ₂ ² −P ₁ ² ) A}
Here, in the above formula, K: Air permeability coefficient (m ² ), d: Test specimen thickness (m), η: Air viscosity coefficient (Pa · s), Q: Air permeability (m ³ / s ), P ₂ ; Loading absolute pressure (MPa), P ₁ ; Atmospheric pressure (MPa), A; Permeation cross section (m ² ).
For reference, when the same test was performed on concrete with a design standard strength of 21 N / mm ² and a slump of 18 cm, the air permeability coefficient was on the order of 10 ⁻¹⁸ .
Moreover, as evaluation of the said measurement result, it is judged that it has sufficient air permeability when an air permeability coefficient is 10 ^-17 order or more, and the results expressed by the following evaluation methods are also shown in Table 4 and Table 5, respectively.
○: 10 ⁻¹⁷ or more ×; 10 ⁻¹⁸ order or less

(Test Example 4; sagging evaluation)
Using each polymer cement-based tile joint mortar obtained in Examples 1 to 5 and Comparative Examples 1 to 8, in accordance with JIS, the JIS (Japan Highway Public Corporation) JIS A spacer having a thickness of 20 cm is attached to a concrete plate defined in A 5304, and each polymer cement mortar tile joint material obtained in Examples 1 to 5 and Comparative Examples 1 to 8 is immediately put into a full space of the spacer. Visually evaluated whether slipping or peeling occurred. The results are shown in Tables 4 and 5.
○: Sagging, slipping or peeling is not observed ×: Sagging, slipping or peeling occurs

(Test Example 5: Evaluation of curability)
Using each polymer cement-based tile joint mortar obtained in Examples 1-5 and Comparative Examples 1-8, after pouring into a mold of size φ 5 × 10 cm, curing at a temperature of 20 ° C. and a humidity of 85% RH for 1 day, After demolding, the state at the time of demolding was evaluated visually and by touch. The results are shown in Tables 4 and 5.
○: Cured ×: Uncured or cracked

(Test Example 6; white flower generation evaluation)
Using each polymer cement tile joint mortar obtained in Examples 1 to 5 and Comparative Examples 1 to 8, the concrete plates specified in JIS A 5304 are 20 mm thick, and Examples 1 to 4 and Comparative are compared. After filling each polymer cement mortar tile joint material obtained in Examples 1-7 and leveling with a trowel, after curing for 28 days at a temperature of 5 ° C. and a humidity of 85% RH, no white flower is generated. This was evaluated visually. The results are shown in Tables 4 and 5.
○: None ×: Occurrence

The polymer cement-based tile joint mortar of the present invention has sufficient deformation followability against the expansion and contraction of building materials such as tiles and stones, and can suppress the occurrence of cracks and edge breaks. It can be usefully used as a joint mortar for tiles attached to the outer wall of a concrete building such as a concrete wall or a concrete panel.

Claims (4)

  Ultra-fast hard cement, polyacrylate polymer, cotton-like fiber, surfactant foaming agent and fine aggregate, the polymer cement (solid content) ratio is 20-80%, the surfactant The system foaming agent is blended at a ratio of 0.1 to 5.0 parts by weight with respect to a total of 100 parts by weight of super fast cement and fine aggregate. For mortar.   The polymer cement-based tile joint mortar according to claim 1, wherein the polyacrylate polymer has a glass transition temperature of -20 ° C or lower.   The polymer cement-based tile joint mortar according to claim 1, wherein 0.1 to 5.0 parts by weight of cotton-like fibers are contained with respect to 100 parts by weight of the super-hard cement and the fine aggregate. And mortar for polymer cement tile joints. In the production of mortar for polymer cement tile joints, a surfactant foaming agent is added in advance to the polymer disperser when kneading super fast hard cement, polyacrylate polymer, cotton fiber and surfactant. A method for producing a mortar for polymer cement tile joints, characterized by being added to John or kneaded water.