WO2022208376A1

WO2022208376A1 - Multifunctional adhesive composition and a process for its preparation

Info

Publication number: WO2022208376A1
Application number: PCT/IB2022/052929
Authority: WO
Inventors: Praveshkumar GUPTA; Randhirsinh PARMAR
Original assignee: Asian Paints Limited
Priority date: 2021-03-30
Filing date: 2022-03-30
Publication date: 2022-10-06

Abstract

The present disclosure relates to a multifunctional adhesive composition. Further, the present disclosure relates to a process for the preparation of the multifunctional adhesive composition. The multifunctional adhesive composition is uniform, homogeneous and has improved water resistance, crack resistance, efflorescence resistance, and color compatibility. The multifunctional adhesive composition is used as a performance enhancer in paints and also as a color/shade offering enabler in paints, especially in cement paints. The process for the preparation of the multifunctional adhesive composition is simple and economical.

Description

MULTIFUNCTIONAL ADHESIVE COMPOSITION AND A PROCESS FOR ITS PREPARATION

FIELD

The present disclosure relates to a multifunctional adhesive composition and a process for its preparation.

DEFINITIONS

As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used to indicates otherwise. Emulsion: The term “Emulsion” refers to a mixture of two or more liquids that are normally immiscible (unmixable or unblendable) owing to liquid-liquid phase separation.

Biocide: The term “biocide” refers to a chemical substance or microorganism, intended to destroy, deter, render harmless or exert a controlling effect on any harmful organism by chemical or biological means. Microfiber (microfibre): The term “microfiber” refers to a synthetic fiber which is finer than one denier or decitex/thread, having a diameter of less than ten micrometers.

Cement Curing Catalyst: The term “cement curing catalyst” also known as a cement hydration catalyst refers to a colloidal, custom-mineralized, pozzolanistic liquid that provides concrete with the maximum possible degree of hydration during its curing process. BACKGROUND

The background information hereinbelow relates to the present disclosure but is not necessarily prior art.

Commercially known cement/ gypsum powdered compositions are manufactured by mixing the raw materials in a sigma mixer/plough mixer. Since all the ingredients are in solid form, it is required to mix these ingredients appropriately to achieve homogeneous composition. For achieving certain specific performances for the cement/ gypsum powdered/ solid compositions, specific additives such as water resistance additive, retarders, plasticizers, rheology modifiers, fungal-algal resistance additive, defoaming agent, and adhesion forming agents are required to be added in small quantities. However, it is difficult to achieve a homogeneous mixture by mere mixing when additives are added in small quantities. Moreover, uneven homogenization affects the performance of the composition.

Further, there are limitations on the choice of the powdered polymers which can be used for preparing such compositions. Moreover, the use of such powdered polymer compositions scores less on sustainability as they consume a great amount of energy for converting them from emulsion to dispersible powder and again to make them dispersible when water is added during application. Such polymers are inherently hydrophilic and when used in powdered compositions they show poor water resistance compared to other polymer emulsions (in liquid form).

Still, further use of the cellulose thickeners in such powdered compositions are more hydrophilic that induces the resulting compositions more water sensitive.

Commercially polyvinyl acetate and polyvinyl alcohol compositions are used in the cement/gypsum powdered compositions for such applications. However, they are not designed specifically to address all the performance needs of powdered compositions. Some of the products are also available as performance boosters (such as a putty booster, plasticizers, and retarders, and the like) but these products do not address the performance requirement comprehensively.

Commercially available cement/gypsum powdered compositions have one or more drawbacks such as the conventional composition is unstable and/or have poor water resistance, efflorescence resistance, crack resistance, water repellants, and non-uniform color dispersion.

Therefore, there is felt a need to provide a multifunctional adhesive composition that mitigates the drawbacks mentioned hereinabove.

OBJECTS

Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows. An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.

Another object of the present disclosure is to provide a multifunctional adhesive composition.

Still another object of the present disclosure is to provide a hydrophobic polymer emulsion based multifunctional adhesive composition that is water resistant or renders water proofing.

Still another object of the present disclosure is to provide a hydrophobic polymer emulsion based multifunctional adhesive composition for enhancing the performance of cement and gypsum based plasters-putties.

Yet another object of the present disclosure is to provide a hydrophobic polymer emulsion based process for the preparation of a multifunctional adhesive composition.

Yet another object of the present disclosure is to provide a simple and economic process for the preparation of a hydrophobic polymer emulsion based multifunctional adhesive composition.

Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.

SUMMARY

The present disclosure relates to a multifunctional adhesive composition and a process of its preparation.

In an aspect, the multifunctional adhesive composition comprises a hydrophobic polymer emulsion in an amount in the range of 20 mass% to 80 mass% with respect to the total mass of the composition, a microfiber in an amount in the range of 5 mass% to 20 mass % with respect to the total mass of the composition, a water repellent additive in an amount in the range of 0.5 mass% to 2 mass % with respect to the total mass of the composition, a silane hydrophobizing agent in an amount in the range of 1 mass% to 5 mass % with respect to the total mass of the composition and at least one additive.

In another aspect, the process for the preparation of a multifunctional adhesive composition comprises mixing, a predetermined amount of at least one first additive in a predetermined amount of at least one solvent in a vessel at a first predetermined speed for a first predetermined time period to obtain a first mixture. A predetermined amount of at least one second additive and optionally a predetermined amount of at least one biocide, a predetermined amount of at least one gypsum retarder and a predetermined amount of at least one cement curing catalyst are added sequentially to the first mixture at a second predetermined speed for a second predetermined time period to obtain a second mixture. A predetermined amount of at least one microfiber, a predetermined amount of at least one water repellent additive, and a predetermined amount of at least one silane hydrophobizing agent are added sequentially to the second mixture under stirring for a third predetermined time period at a third predetermined speed to obtain a third mixture and a predetermined amount of at least one hydrophobic polymer emulsion, a predetermined amount of at least one third additive are mixed sequentially into the third mixture at a fourth predetermined speed for a fourth predetermined time period to obtain the multifunctional adhesive composition.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING

The present disclosure will now be described with the help of the accompanying drawing, in which:

Figure 1 illustrates the performance evaluation of the multifunctional adhesive composition of the present disclosure in cement putty against commercial water-proof putty with respect to water resistance;

Figure 2 illustrates the performance evaluation of the multifunctional adhesive composition of the present disclosure in cement putty with respect to chalking (adhesion of putty on the dry surface);

Figure 3 illustrates the performance evaluation of the multifunctional adhesive composition of the present disclosure in cement putty with respect to adhesion of topcoat after the application of paint on the surface;

Figure 4 illustrates the performance evaluation of the multifunctional adhesive composition of the present disclosure in cement putty against the standard putty with respect to crack resistance;

Figure 5 illustrates the performance evaluation of the multifunctional adhesive composition of the present disclosure in cement putty against the commercial hydrophobic emulsion (styrene butadine) with respect to efflorescence resistance; Figure 6 illustrates the performance evaluation of the multifunctional adhesive composition (20%) of the present disclosure with the gypsum powder against normal gypsum and gypsum with 20% commercial adhesive with respect to water resistance;

Figure 7 illustrates the performance evaluation of the multifunctional adhesive composition (20%) of the present disclosure in gypsum with 1% machine colorant with respect to color uniformity;

Figure 8 illustrates the performance evaluation of the multifunctional adhesive composition (20%) of the present disclosure in cement paints against the standard cement paints with 1 % of machine colorant and 20% multifunctional adhesive composition and commercial cement paint with respect to drying/curing;

Figure 9 illustrates the performance evaluation of the multifunctional adhesive composition (20%) of the present disclosure in cement paints against the unmodified commercial cement paint with respect to scrub resistance/film integrity;

Figure 10 illustrates the performance evaluation of the multifunctional adhesive composition (20%) of the present disclosure in cement paints against the standard water-proof cement with respect to water resistance; and

Figure 11 illustrates the antialgal activity of the multifunctional adhesive composition in the cement paints.

DETAILED DESCRIPTION Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.

Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail. The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.

Commercially known cement/ gypsum powdered solid compositions are manufactured by using the sigma mixer / plough mixer. Since all the ingredients are in solid forms, it is required to mix these ingredients appropriately to achieve homogeneity.

For achieving certain specific performances in the cement/ gypsum powdered/ solid compositions, the specific additives such as water resistance additive, retarders, plasticizers, rheology modifiers, fungal- algal resistance additive, defoaming agent, and adhesion forming agents are required to be added in a very small quantity in the cement/ gypsum powdered/ solid compositions. Such addition of the small quantities of the specific additives in the cement/ gypsum powdered/ solid compositions has difficulty in homogenizing just by mixing; that affects on the performance of the composition.

Further, there are limitations on choice of the powdered polymers which can be used for preparing such compositions. Moreover, the use of such powdered polymer compositions scores less on sustainability as they consume great amount of energy for converting them from emulsions to powder and again to make them dispersible when water is added during application. Such polymers are inherently hydrophilic and when used in powdered compositions they show poor water resistance compared to other polymer emulsions (in liquid form).

Still further, use of the cellulose thickeners used in such powdered compositions is much more hydrophilic that induces the resulting compositions more water sensitive. Commercially polyvinyl acetate and polyvinyl alcohol compositions are used in the cement/gypsum powdered composition for such applications however they are not designed specifically to address all the performance needs of powdered compositions. Some of the products are also available as performance boosters (such as putty booster, plasticizers, and retarders and the like) but these products do not address the performance requirement comprehensively.

Commercially available cement/gypsum compositions have one or more of the drawbacks such as the conventional composition is unstable and/or have poor water resistance, efflorescence resistance, crack resistance, water repellants, and non-uniform color dispersion. There is a continued desire for a multifunctional adhesive composition that is uniform, stable, and compatible with the other ingredients of the composition and is easy to handle, safe, and have better performance.

The present disclosure provides a multifunctional adhesive composition and a process for its preparation. In an embodiment, the multifunctional adhesive composition is a hydrophobic polymer emulsion based multifunctional adhesive composition.

The multifunctional adhesive composition comprises: a) a hydrophobic polymer emulsion in an amount in the range of 20 mass % to 80 mass % with respect to the total mass of the composition; b) a microfiber in an amount in the range of 5 mass % to 20 mass % with respect to the total mass of the composition; c) a water repellent additive in an amount in the range of 0.5 mass % to 2 mass % with respect to the total mass of the composition; d) a silane hydrophobizing agent in an amount in the range of 1 mass % to 5 mass % with respect to the total mass of the composition; and e) at least one additive. In accordance with the present disclosure, the hydrophobic polymer emulsion is prepared by using at least one monomer is selected from the group consisting of styrene, acrylic acid, an acrylate, (meth)acrylic acid), methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, glycidyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, a long chain alkyl (meth)acrylate having an alkyl group with C₉-C₁₃ atoms such as nonyl, isononyl, decyl, isodecyl, dodecyl, isododecyl, tridecyl, isotridecyl), vinyl 2- ethylhexanoate, vinyl laurate, vinyl stearate, vinyl alkyl or aryl ethers with (C₉-C₃₀) alkyl groups such as stearyl vinyl ether; alkyl esters of (meth-)acrylic acid, such as hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl acrylate, isononyl acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, dodecyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, benzyl (meth)acrylate, lauryl (meth)acrylate, oleyl (meth)acrylate, palmityl (meth)acrylate, and stearyl (meth)acrylate; unsaturated vinyl esters of (meth)acrylic acid such as those derived from fatty acids and fatty alcohols; vinyl esters of branched mono- carboxylic acids having a total of 8 to 12 carbon atoms in the acid residue moiety and 10 to 14 total carbon atoms such as, for example, vinyl 2-ethyl hexanoate, vinyl neo-nonanoate, vinyl neo-decanoate, vinyl neo- undecanoate, and vinyl neo-dodecanoate.

In another embodiment of the present disclosure, the hydrophobic polymer emulsion particularly comprises at least one monomer selected from the group consisting of styrene, 2 ethyl hexyl acrylate, butyl meth acrylate, and methyl methacrylate and trace amount of methacrylic acid.

In an exemplary embodiment, the hydrophobic polymer emulsion is styrene acrylic polymer emulsion.

In accordance with the embodiments of the present disclosure, the amount of the hydrophobic polymer emulsion is in the range of 20 mass % to 80 mass % with respect to the total mass of the composition. In an exemplary embodiment, the amount of the hydrophobic polymer emulsion is 50 mass %.

In accordance with the embodiments of the present disclosure, the particle size of the hydrophobic polymer emulsion is in the range of 50 nm to 200 nm.

In an exemplary embodiment, the particle size of the hydrophobic polymer emulsion is 140 nm. In accordance with the embodiments of the present disclosure, the glass transition temperature of the hydrophobic polymer emulsion is in the range of 0 to 5 □ .

In an exemplary embodiment, the glass transition temperature of the hydrophobic polymer emulsion is 3 □ . In accordance with the embodiments of the present disclosure, the minimum film forming temperature (MFFT) of the hydrophobic polymer emulsion is in the range of 10 to 15 □.

In an exemplary embodiment, the minimum film forming temperature (MFFT) of the hydrophobic polymer emulsion is 13 □. The minimum film forming temperature MFFT is further lowered by the presence of coalescing agents used in the multifunctional adhesive composition.

In accordance with the embodiments of the present disclosure, the hydrophobic polymer emulsion has the following characteristics: a) an anionic/non-ionic stability; b) a viscosity is in the range of 50 cps to 150 cps; and c) a density of 1.05 gm/cc.

In accordance with the embodiments of the present disclosure, the microfiber is at least one selected from the group consisting of polyester fibers, acrylic fibers and nylon fibers.

The polyester fibers is characterized by having a melting point of 250 □, a length of 0.9 mm a diameter of 12 micron and a hollow size of 6 microns leading to porosity of about 40%. In an exemplary embodiment, the hollow microfiber is polyester fibers.

In accordance with the embodiments of the present disclosure, the amount of the microfiber is in the range of 5 mass % to 20 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the microfiber is 10 mass %.

In accordance with the present disclosure, the microfibers are hollow fibers that improve the flexibility and toughness of the adhesive composition without affecting the workability. Due to the hollow nature of the microfibers, it also contributes demonstrating the thermal insulation property and enables best dispersibility in the multifunctional adhesive composition. In accordance with the embodiments of the present disclosure, the water repellent additive consisting of reactive silane and siloxane mixture in the emulsion forms with solvent less composition.

In an exemplary embodiment, the water repellent additive is a mixture of silane and siloxane in emulsion form.

In accordance with the embodiments of the present disclosure, the amount of the water repellent additive is in the range of 0.5 mass % to 2 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the silane and siloxane is 1 mass %. In accordance with the embodiments of the present disclosure, the silane hydrophobizing agent is polysiloxane modified functional resin emulsion.

In an exemplary embodiment, the silane hydrophobizing agent is polysiloxane modified with functional silicone resin.

In accordance with the embodiments of the present disclosure, the amount of the silane hydrophobizing agent is in the range of 1 mass % to 5 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the hydrophobizing agent is 3 mass %.

In accordance with the embodiments of the present disclosure, additive is at least one selected from a preservative, a defoamer, a thickener, a dispersant, a wetting agent, a coalescing agent, a silane coupling agent and a superplasticizer.

In accordance with the embodiments of the present disclosure, the preservative is at least one selected from the group consisting of a solution of chloromcthyl -/methyl isothiazolonc and formaldehyde, benzisothiazolinone (BIT). In an exemplary embodiment, the preservative is a solution of chloromcthyl -/methyl isothiazolonc and formaldehyde. In accordance with the embodiments of the present disclosure, the amount of the preservative is in the range of 0.0.1 mass % to 0.3 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the preservative is 0.1 mass %. In accordance with the embodiments of the present disclosure, the defoamer is at least one selected from the group consisting of mineral oil defoamer composition and silicone oil defoamer composition.

In an exemplary embodiment, the defoamer is mineral oil defoamer composition. In accordance with the embodiments of the present disclosure, the mineral oil defoamer composition comprises up to 90% of the mineral oil and up to 5 % of hydrophobic particles like surface modified silica etc. along with wetting agents up to 3 %, having a density of 0.9 to 1.00 g/cc, a viscosity in the range of 500 to 1500 cps.

In accordance with the embodiments of the present disclosure, the amount of the defoamer is in the range of 0.1 mass % to 10 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the defoamer is 0.25 mass %.

In accordance with the embodiments of the present disclosure, a thickener is at least one selected from the group consisting of hydroxyethyl cellulose, hydroxyl propyl cellulose and polyvinyl alcohols. In an exemplary embodiment, the thickener is HEC (hydroxyethyl cellulose).

In accordance with the embodiments of the present disclosure, the amount of the thickener is in the range of 0.5 mass % to 2 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the thickener is 1 mass %.

In accordance with the embodiments of the present disclosure, the dispersant is at least one selected from the group consisting of a solution of 95% 2-Amino-2-methyl-l -propanol and ammonia.

In an exemplary embodiment, the dispersant is 95% 2-Amino-2-methyl-l -propanol solution.

In accordance with the embodiments of the present disclosure, the amount of the dispersant is in the range of 0.1 mass % to 0.3 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the dispersant is 0.1 mass. %.

In accordance with the embodiments of the present disclosure, the wetting agent is selected from fatty alcohol ethoxylates.

In an exemplary embodiment, the wetting agent is C9-C₁₁ alcohol ethoxylate. In accordance with the embodiments of the present disclosure, the amount of the wetting agent is in the range of 0.01 mass % to 1 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the wetting agent is 0.25 mass %.

In accordance with the embodiments of the present disclosure, the coalescing agent is at least one selected from the group consisting of 2, 2, 4-Trimethyl- 1, 3-pentanediol monoisobutyrate and 2, 2, 4-trimethyl- 1, 3-pentanediol diisobutyrate.

In an exemplary embodiment, the coalescing agent is 2, 2, 4-Trimethyl- 1, 3-pentanediol monoisobutyrate, e.g. Texanol

In accordance with the embodiments of the present disclosure, the amount of the coalescing agent is in the range of 5 mass % to 20 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the coalescing agent is 10 mass %.

In accordance with the embodiments of the present disclosure, the silane coupling agent is at least one selected from the group consisting epoxy functional silane monomer and epoxy functional silane oligomer. In an exemplary embodiment, the silane coupling agent is epoxy functional silane oligomer.

In accordance with the embodiments of the present disclosure, the amount of the silane coupling agent is in the range of 0.1 mass % to 1 mass% of the total mass of the composition. In an exemplary embodiment, the amount of the silane coupling agent is 0.25 mass%.

In accordance with the embodiments of the present disclosure, the superplasticizer is at least one selected from the group consisting of Polycarboxylate ether, sodium polyacrylates and ammonium polyacrylates. In an exemplary embodiment, the superplasticizer is Polycarboxylate ether.

In accordance with the embodiments of the present disclosure, the amount of the superplasticizer is in the range of 0.01 mass % to 1.5 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the superplasticizer is 0.25 mass %.

In accordance with the embodiments of the present disclosure, the multifunctional adhesive composition comprises at least one gypsum retarder. In accordance with the embodiments of the present disclosure, the gypsum retarder is at least one selected from the group consisting of polyamides modified with calcium compounds and proteins. The synergy of such setting time retarders is achieved along with acids like citric acid and tartaric acid. In an exemplary embodiment, the gypsum retarder is polyamides modified with calcium compounds.

In accordance with the embodiments of the present disclosure, the amount of the gypsum retarder is in the range of 0.01 mass % to 0.5 mass % of the total mass of the composition.

In an exemplary embodiment, the amount of the gypsum retarder is 0.1 mass %. In accordance with the embodiments of the present disclosure, the multifunctional adhesive composition comprises at least one cement curing catalyst and at least one biocide.

In accordance with the embodiments of the present disclosure, the cement curing catalyst is at least one selected from the group consisting of calcium formate, calcium methanoate, calcium chloride and the combinations with lime. In an exemplary embodiment, the cement curing catalyst is calcium formate.

In accordance with the embodiments of the present disclosure, the amount of the cement curing catalyst is in the range of 0.5 mass % to 3 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the cement curing catalyst is 1 mass %.

In accordance with the embodiments of the present disclosure, the biocide is at least one selected from the group consisting of mixtures of Benzimidazole carbamate, OIT (2-n-Octyl- 4-isothiazolin-3-ones), and urea derivative.

In one embodiment, the biocide is Benzimidazole carbamate. In another embodiment, the biocide is OIT (2-n-Octyl-4-isothiazolin-3-ones). In still another embodiment, the biocide is urea derivative. In accordance with the embodiments of the present disclosure, the amount of the biocide is in the range of 0.1 mass % to 1 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the biocide is 0.25 mass %. In accordance with the embodiments of the present disclosure, the multifunctional adhesive composition comprises at least one solvent.

In accordance with the embodiments of the present disclosure, the solvent is water

In accordance with the embodiments of the present disclosure, the amount of the solvent is in the range of 30 mass % to 40 mass % of the total mass of the composition. In an exemplary embodiment, the amount of the solvent is 30.25 mass%.

In an embodiment, the multifunctional adhesive composition is liquid. In another embodiment, the multifunctional adhesive composition is solid in the form of powder.

In accordance with the embodiments of the present disclosure, the multifunctional adhesive composition is characterized by having the properties tabulated below in the table 1 :

Table 1

In another aspect, the present disclosure provides a process for the preparation of a multifunctional adhesive composition.

The process is described in detail as: In a first step, the process comprises the step of mixing a predetermined amount of at least one first additive in a predetermined amount of at least one solvent in a vessel at a first predetermined speed for a first predetermined time period to obtain a first mixture.

In accordance with the embodiments of the present disclosure, the first additive is at least one selected from a preservative, a thickener and a defoamer. In accordance with the embodiments of the present disclosure, the preservative is at least one selected from the group consisting of a solution of chloromethyl-/methylisothiazolone and formaldehyde, benzisothiazolinone (BIT). In an exemplary embodiment, the preservative is a solution of chloromethyl-/methylisothiazolone and formaldehyde. In accordance with the embodiments of the present disclosure, a thickener is at least one selected from the group consisting of hydroxyethyl cellulose, hydroxyl propyl cellulose and polyvinyl alcohols. In an exemplary embodiment, the thickener is HEC (hydroxyethyl cellulose).

In accordance with the embodiments of the present disclosure, the defoamer is at least one selected from the group consisting of mineral oil defoamer composition and silicone oil defoamer composition.

In an exemplary embodiment, the defoamer is mineral oil defoamer composition.

In accordance with the embodiments of the present disclosure, the mineral oil defoamer composition comprises up to 90% of the mineral oil and up to 5 % of hydrophobic particles like surface modified silica etc. along with wetting agents up to 3 %, having a density of 0.9 to 1.00 g/cc, a viscosity in the range of 500 to 1500 cps.

In accordance with the embodiments of the present disclosure, the solvent is water.

In accordance with the embodiments of the present disclosure, the first predetermined time period is in the range of 2 to 8 min. In an exemplary embodiment, the first predetermined time period is 5 min.

In accordance with the embodiments of the present disclosure, the first predetermined speed is in the range of 300 rpm to 500 rpm. In an exemplary embodiment, the first predetermined speed is 400 rpm.

In the second step, a predetermined amount of at least one second additive and optionally a predetermined amount of at least one biocide, a predetermined amount of at least one gypsum retarder and a predetermined amount of at least one cement curing catalyst are added sequentially to the first mixture at a second predetermined speed for a second predetermined time period to obtain a second mixture. In accordance with the embodiments of the present disclosure, the second additive is at least one selected from a dispersant, a superplasticizer and a wetting agent.

In accordance with the embodiments of the present disclosure, the superplasticizer is at least one selected from the group consisting of Polycarboxylate ether, sodium polyacrylates and ammonium poly acrylates. In an exemplary embodiment, the superplasticizer is Polycarboxylate ether.

In an exemplary embodiment, the wetting agent is C9-C11 alcohol ethoxylate.

In accordance with the embodiments of the present disclosure, the biocide is at least one selected from the group consisting of mixtures of Benzimida ole carbamate, OIT (2-n-Octyl- 4-isothiazolin-3-ones), and urea derivative.

In one embodiment, the biocide is Benzimidazole carbamate. In another embodiment, the biocide is OIT (2-n-Octyl-4-isothiazolin-3-ones). In still another embodiment, the biocide is urea derivative.

In accordance with the embodiments of the present disclosure, the gypsum retarder is at least one selected from the group consisting of polyamides modified with calcium compounds and proteins.

The synergy of such setting time retarders is achieved along with acids like citric acid and tartaric acid.

In an exemplary embodiment, the gypsum retarder is polyamides modified with calcium compounds. In accordance with the embodiments of the present disclosure, the cement curing catalyst is at least one selected from the group consisting of calcium formate, calcium methanoate, calcium chloride and the combinations with lime.

In an exemplary embodiment, the cement curing catalyst is calcium formate. In accordance with the embodiments of the present disclosure, the second predetermined time period is in the range of 2 to 8 min. In an exemplary embodiment, the first predetermined time period is 5 min.

In accordance with the embodiments of the present disclosure, the second predetermined speed is in the range of 300 to 500 rpm. In an exemplary embodiment, the second predetermined speed is 400 rpm.

In the third step, a predetermined amount of at least one microfiber, a predetermined amount of at least one water repellent additive, and a predetermined amount of at least one silane hydrophobizing agent are added sequentially to the second mixture under stirring for a third predetermined time period at a third predetermined speed to obtain a third mixture. In accordance with the embodiments of the present disclosure, the microfiber is at least one selected from the group consisting of polyester fibers, acrylic fibers and nylon fibers.

The polyester fibers is characterized by having a melting point of 250D, a length of 0.9 mm a diameter of 12 micron and a hollow size of 6 microns leading to porosity of about 40%.

In an exemplary embodiment, the hollow microfiber is polyester fibers. In accordance with the present disclosure, the microfibers are hollow fibers that improve the flexibility and toughness of the adhesive composition without affecting the workability. Due to the hollow nature of the microfibers, it also contributes demonstrating the thermal insulation property and enables best dispersibility in the multifunctional adhesive composition. In accordance with the embodiments of the present disclosure, the water repellent additive consisting of reactive silane and siloxane mixture in the emulsion forms with solvent less composition. In an exemplary embodiment, the water repellent additive is a mixture of silane and siloxane in emulsion form.

In accordance with the embodiments of the present disclosure, the silane hydrophobizing agent is polysiloxane modified functional resin emulsion.

In accordance with the embodiments of the present disclosure, the third predetermined speed is in the range of 1000 rpm to 1500 rpm. In an exemplary embodiment, the third predetermined speed is 1200 rpm.

In accordance with the embodiments of the present disclosure, the third predetermined time period is in the range of 15 min to 25 min. In an exemplary embodiment, the third predetermined time period is 20 min.

In the fourth step, a predetermined amount of at least one hydrophobic polymer emulsion, a predetermined amount of at least one third additive are mixed sequentially into the third mixture at a fourth predetermined speed for a fourth predetermined time period to obtain the multifunctional adhesive composition.

In accordance with the embodiments of the present disclosure, the third additive is at least one selected from a coalescing agent and a silane coupling agent.

In accordance with the present disclosure, the hydrophobic polymer emulsion is prepared by using at least one monomer is selected from the group consisting of styrene, acrylic acid, an acrylate, (meth)acrylic acid), methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, glycidyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, a long chain alkyl (meth)acrylate having an alkyl group with C₉-C₁₃ atoms such as nonyl, isononyl, decyl, isodecyl, dodecyl, isododecyl, tridecyl, isotridecyl), vinyl 2- ethylhexanoate, vinyl laurate, vinyl stearate, vinyl alkyl or aryl ethers with (C₉-C₃₀) alkyl groups such as stearyl vinyl ether; alkyl esters of (meth-)acrylic acid, such as hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl acrylate, isononyl acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, dodecyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, benzyl (meth)acrylate, lauryl (meth)acrylate, oleyl (meth)acrylate, palmityl (meth)acrylate, and stearyl (meth)acrylate; unsaturated vinyl esters of (meth)acrylic acid such as those derived from fatty acids and fatty alcohols; vinyl esters of branched mono- carboxylic acids having a total of 8 to 12 carbon atoms in the acid residue moiety and 10 to 14 total carbon atoms such as, for example, vinyl 2-ethyl hexanoate, vinyl neo-nonanoate, vinyl neo-decanoate, vinyl neo- undecanoate, and vinyl neo-dodecanoate.

In another embodiment of the present disclosure, the hydrophobic polymer emulsion particularly comprises at least one monomer selected from the group consisting of styrene, 2 ethyl hexyl acrylate, butyl meth acrylate, methyl methacrylate and trace amount of methacrylic acid. In an exemplary embodiment, the hydrophobic polymer emulsion is styrene acrylic polymer emulsion.

In accordance with the embodiments of the present disclosure, the coalescing agent is at least one selected from the group consisting of 2, 2, 4-Trimethyl- 1, 3-pentanediol monoisobutyrate and 2, 2, 4-trimethyl- 1, 3-pentanediol Diisobutyrate. In an exemplary embodiment, the coalescing agent is 2, 2, 4-Trimethyl- 1, 3-pentanediol monoisobutyrate, e.g. Texanol

In accordance with the embodiments of the present disclosure, the fourth predetermined speed is in the range of 400 rpm to 600 rpm. In an exemplary embodiment, the third predetermined speed is 500 rpm.

In accordance with the embodiments of the present disclosure, the fourth predetermined time period is in the range of 10 min to 20 min. In an exemplary embodiment, the fourth predetermined time period is 15 min.

In accordance with the embodiments of the present disclosure, the so obtained hydrophobic polymer emulsion is in liquid form. In accordance with the embodiments of the present disclosure, the so obtained hydrophobic polymer emulsion based multifunctional adhesive composition is further stirred and finally packaged into a can and transferred for the performance evaluation.

In still another aspect, the present disclosure discloses a process for the preparation of a multifunctional adhesive composition in the form powder.

In accordance with the embodiments of the present disclosure, the so obtained liquid composition of the multifunctional adhesive composition is blended with a predetermined amount of white cement and dolomite (500 mesh) in a sigma mixer for a time period in the range of 5 min to 15 min, preferably 10 min to obtain the powdered multifunctional adhesive composition in the powder form.

In accordance with the embodiments of the present disclosure, the amount of the white cement can be in the range of 20 mass% to 40 mass %. In an exemplary embodiment, the amount of the white cement is 25 mass %.

In accordance with the embodiments of the present disclosure, the amount of the dolomite can be in the range of 60 mass% to 90 mass %. In an exemplary embodiment, the amount of the dolomite is 75 mass %.

In an embodiment of the present disclosure, the use of the multifunctional adhesive composition in the cement/gypsum based plaster-putties enhances the performance of cement/gypsum based plaster-putties. The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments can be scaled up to industrial/commercial scale and the results obtained can be extrapolated to industrial scale. EXPERIMENTAL DETAILS

Example 1: Preparation of multifunctional adhesive composition in a liquid form ( 1000 gms) lg solution of chloromethyl-/methylisothiazolone and formaldehyde, lOg of hydroxyethyl cellulose, 2.5g of mineral oil defoamer and 302 ml of water were mixed in a vessel at 400 rpm for 5 min to obtain a first mixture lg solution of 2-amino-2-methyl-l -propanol solution (95%), 2.5g of polycarboxylate ether, 2.5g of C₉-C₁₁ alcohol ethoxylates, 0.42g of Benzimidazole carbamate, 0.42g 2-n-Octyl-4-isothiazolin-3-ones and 1.67g urea derivative, O.lg of polyamides modified with calcium compounds, and lOg of calcium formate were mixed sequentially into the first mixture at 400 rpm for 5 min to obtain a second mixture. lOOg of polyester fibers, 7.5g of mixture of silane and siloxane, and 15 g of polysiloxane modified with functional silicone resin were mixed sequentially into the second mixture under stirring for 20 min at 1200 rpm to obtain a third mixture. 530g of hydrophobic polymer emulsion, lOg of 2, 2, 4-Trimethyl- 1,3 -pentanediol monoisobutyrate, and 2.5g of epoxy functional silane oligomer were mixed sequentially into the third mixture at 500 rpm for 15 min to obtain 1000 g multifunctional adhesive composition in a liquid form.

The so obtained composition was further stirred for 10 min and transferred to cans and was evaluated to check the performance and other parameters.

The so obtained composition was evaluated to assess the physical properties of the composition which are tabulated as below in table 2:

Table 2:

Example 2: Preparation of the powdered composition to be used along with Multifunctional adhesive to prepare the modified cement putty

The so obtained multifunctional adhesive composition of example 1 was further blended with a powder composition comprises 250g of white cement and 750g of dolomite having a 500 mesh size in a sigma mixer for 15 min to obtain the multifunctional adhesive composition for the cement putty in the powder form.

Example 3: Comparative examples

200 ml of the liquid composition as prepared in accordance with example 1 was mixed thoroughly in 200 ml of water in a vessel to obtain a uniform and homogenized liquid mixture. 1 kg of the powdered composition as prepared in accordance with example 2 was mixed thoroughly into the homogenized liquid mixture to form a putty in a paste form.

The so obtained putty in the form of paste was applied on various molds at a varied thickness (2 to 5 mm) to assess the respective performance of the putty with respect to water resistance, recoatability, adhesion, crack resistance, efflorescence resistance, colorant compatibility, film integrity, and antialgal activity as explained below:

Evaluation of the performance parameters in the cement:

1) Water resistance:

The so obtained putty as per example 3 of the present disclosure was tested for water resistance against the commercial waterproofing putty. Rilem tube method was employed to evaluate the water resistance in which water beading on sanded and non sanded surfaces was used for 48 hrs to characterize the water resistance of the putty prepared as per example 3.

It was evident from figure 1 of the present disclosure that the putty effectively resists water in the sanded area and hence superior water resistance against the commercial waterproofing putty.

2) Recoatability or Sandability:

The putty of the present disclosure was applied on the cement plaster surface followed by sanding with emery paper no. 180 and dried for 4 hours to assess the clogging or uniformity. It was found that after 4 hours of putty application, no paper clogging was observed on the paper and hence the putty of the present disclosure effectively repels water. ) Adhesion of the putty (chalking):

The putty of the present disclosure was applied on the cement plaster surface followed by curing for 24 hours to obtain the dry surface. After 24 hours the black cloth was rubbed on the dried putty surface to assess the chalking. Figure 2 of the present disclosure indicates that no sign of any chalking was observed. Hence, the putty of the present disclosure has greater adhesion. ) Adhesion of topcoat:

The topcoat water-based high PVC (pigment volume concentration) paint was applied over the putty of the present disclosure and the adhesion was checked by a cross-cut method. Figure 3 of the present disclosure showed better adhesion on the topcoat. ) Crack resistance:

The standard commercial putty ( 2 mm thickness) specimens were exposed to hot (90°C) and cold (5°C) cycles (5 cycles) and checked for any visible crack formation. The standard commercial putty showed the crack in 2 cycles, whereas the putty of the present disclosure passed 5 cycles without crack formation showing very good thermal expansion-contraction resistance as depicted in Figure 4. ) Efflorescence resistance:

The putty of the present disclosure was applied on the cement composite panels and coated with latex emulsion paint with dark shade to assess the effect of efflorescence. The fully dried (7 days cured panels) were exposed to 5 % NaCl solution and below are the observations as tabulated in Table 3.

Table 3:

Inference: The experimental sets with increased hydrophobic emulsion show the best efflorescence resistance along with the silane and siloxane combination. Table3 below shows the key experimental parameters where the hydrophobic emulsion content was 5 studied vs. the commercial hydrophobic emulsion (styrene butadine) along with the silane siloxane additives.

The results of efflorescence in figure 5 shows that the hydrophobic emulsion proposed with 50% level ( 5% active solids in the cement composition) showed the best

10 efflorescence resistance.

Table 4:

Inference: Table 4 summarizes the basic performances of the key powdered and liquid binders and commercial adhesive when used along with the cement putty composition either as a single pack ( powdered composition ) or two pack for the liquid emulsion polymers. It 5 was evident that the hydrophobic emulsion used to prepare the multifunctional adhesive composition has superior performance among other ingredients and thus acts as a basic building block in the preparation of the composition.

Hence, after referring to figure 1 to 5 and above experiments it was concluded that the putty of the present disclosure has enhanced performance in the cement as compared to the 10 commercial putties.

Evaluation of the performance parameters in the Gypsum plaster:

1. Water resistance:

20 mass% of liquid composition as prepared in example 1 was mixed with commercial gypsum powder and assessed for water absorption against the plain 15 gypsum and gypsum with 20% commercial glue. Figure 6 of the present disclosure indicates that the adhesive composition of the present disclosure showed superior water resistance as compared to plain gypsum and gypsum with 20% commercial glue. The putty of the present disclosure resists water whereas the plain gypsum and gypsum with 20% commercial glue absorbed water completely.

2. Uniformity of color: the multifunctional adhesive composition (20%) of the present disclosure and 1 % of machine colorant with gypsum showed superior uniformity in the different color shades as depicted in figure 7.

Evaluation of the performance parameters in the Cement paints:

1. Drying/ curing without water curing: 20% multifunctional adhesive composition was used in the commercial cement paints to replace the tedious step of water curing. It was found that the multifunctional adhesive based composition did not require water curing and the resulting film was much better free of chalking which was a typical problem in cement paints as depicted in figure 8.

2. Film integrity - scrub resistance :

The multifunctional adhesive based cement paint showed improved scrub resistance against the unmodified commercial cement paint as depicted in figure 9.

3) Water resistance:

The so obtained multifunctional adhesive composition as per example 1 of the present disclosure was tested for the water resistance against the standard waterproof cement paint. It was evident from figure 10 of the present disclosure that the multifunctional adhesive composition of the present disclosure resists water and is hence superior to the standard waterproof cement paint.

4) Colorant compatibility :

The multifunctional adhesive composition as prepared in accordance with examples 1 and 2 of the present disclosure was effectively offered wide shades in liquid form as well as in dry form at the dealer’s end. 5) Antialgal performance in the cement paint:

The liquid multifunctional adhesive composition as per example 1 of the present disclosure was used in the cement paint and was found to be effective against the algae. Two cement paint films were prepared as below:

1. 20% mass of cement paint and 20% water were added into the multifunctional adhesive composition and mixed thoroughly to obtain a mixture. The mixture was casted with 150 microns film applicator and allowed to cure for 7 days to obtain a first cement paint film. 2. Cement paint with 40% water (without the multifunctional adhesive) mixed thoroughly and casted with 150 microns film applicator and allowed to cure for 7 days to obtain a second cement paint film.

The so obtained first and second free films were cut for 1 sq., inch size and put in the petri dish which was infested with the known algal culture and allowed to rest for two weeks for observing the zone of inhibition of the algal growth in the Petri dish.

Observations & Result:

Table 5:

* ZOI - Zone of Inhibition; NZ - No Zone of Inhibition; NGPF - No Growth on Paint film; GPF - Growth on Paint fil Inference: It was evident from table 5 and figure 11 that the first cement paint film with multifunctional adhesive composition effectively reduces algae counts as compared to the second cement paint film in which the multifunctional adhesive composition was not used. Hence, the multifunctional adhesive composition of the present disclosure has an antialgal activity.

TECHNICAL ADVANCEMENTS

The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a multifunctional adhesive composition that:

• is homogenous and can be uniformly dispersed;

• has improved water resistance, crack resistance, and efflorescence resistance;

• has a color compatibility;

• can be used as a performance enhancer in paints and also as the color/shade offering enabler in paints, especially in cement paints;

• has faster curing and drying;

• can be uniformly mixed with colorants, and

• a simple and economic process for the preparation of a multifunctional adhesive composition.

Throughout this specification, the word “comprise”, or variations such as “comprises” or “comprising, will be understood to imply the inclusion of a stated element, integer or step,” or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results. While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Variations or modifications to the formulation of this invention, within the scope of the invention, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this invention.

The numerical values given for various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the invention unless there is a statement in the specification to the contrary.

While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the disclosure. These and other changes in the preferred embodiment of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

Claims

CLAIMS:

1. A multifunctional adhesive composition comprising: a) a hydrophobic polymer emulsion in an amount in the range of 20 mass % to 80 mass % with respect to the total mass of the composition; b) a microfiber in an amount in the range of 5 mass % to 20 mass % with respect to the total mass of the composition; c) a water repellent additive in an amount in the range of 0.5 mass % to 2 mass % with respect to the total mass of the composition; d) a silane hydrophobizing agent in an amount in the range of 1 mass % to 5 mass % with respect to the total mass of the composition; and e) at least one additive.

2. The composition as claimed in claim 1, wherein said hydrophobic polymer emulsion is prepared by using at least one monomer selected from the group consisting of styrene, acrylic acid, an acrylate, (meth)acrylic acid), methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, glycidyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, a long chain alkyl (meth)acrylate having an alkyl group with C9-C13 atoms, vinyl 2-ethylhexanoate, vinyl laurate, vinyl stearate, vinyl alkyl or aryl ethers with (C9-C30) alkyl groups, vinyl 2-ethyl hexanoate, vinyl neo-nonanoate, vinyl neo-decanoate, vinyl neo- undecanoate, and vinyl neo- dodecanoate.

3. The composition as claimed in claim 1, wherein said hydrophobic polymer emulsion has a particle size is in the range of 50 nm to 200 nm.

4. The composition as claimed in claim 1 , wherein said hydrophobic polymer emulsion has a glass transition temperature is in the range of 0 to 5 □ and minimum film forming temperature is in the range of 10 to 15 □.

5. The composition as claimed in claim 1, wherein said hydrophobic polymer emulsion is characterized by having: a) an anionic/non-ionic stability; b) a viscosity in the range of 50 cps to 150 cps; and c) a density of 1.05 gm/cc.

6. The composition as claimed in claim 1, wherein said microfiber is at least one selected from the group consisting of polyester fibres, acrylic fibers and nylon fibres.

7. The composition as claimed in claim 1, wherein said water repellent additive is a mixture of silane and siloxane in an emulsion form.

8. The composition as claimed in claim 1, wherein said silane hydrophobizing agent is polysiloxane modified with functional silicone resin.

9. The composition as claimed in claim 1, wherein said additive is at least one selected from a preservative, a defoamer, a thickener, a dispersant, a wetting agent, a coalescing agent, a silane coupling agent and a superplasticizer.

10. The composition as claimed in claim 9, wherein said preservative is at least one selected from the group consisting of a solution of chloromethyl- /methylisothiazolone, and formaldehyde, Benzisothiazolinone; and said preservative is present in an amount in the range of 0.01 mass % to 0.3 mass % with respect to the total mass of the composition.

11. The composition as claimed in claim 9, wherein said defoamer is at least one selected from the group consisting of mineral oil defoamer composition and silicone oil defoamer composition; and said defoamer is present in an amount in the range of 0.1 mass % to 10 mass % with respect to the total mass of the composition.

12. The composition as claimed in claim 9, wherein said thickener is at least one selected from the group consisting of hydroxy ethyl cellulose, hydroxy propyl cellulose, and poly vinyl alcohols; and said thickener is present in an amount in the range of 0.5 mass % to 2 mass % with respect to the total mass of the composition.

13. The composition as claimed in claim 9, wherein said dispersant is at least one selected from the group consisting of 2-amino-2-methyl-l -propanol solution (95%), and ammonia; and said dispersant is present in an amount in the range of 0.1 mass % to 0.3 mass % with respect to the total mass of the composition.

14. The composition as claimed in claim 9, wherein said wetting agent is selected from fatty alcohol ethoxylates; and said wetting agent is present in an amount in the range of 0.01 mass % to 1 mass % with respect to the total mass of the composition.

15. The composition as claimed in claim 9, wherein said coalescing agent is at least one selected from the group consisting of 2, 2, 4-trimethyl- 1, 3-pentanediol monoisobutyrate and 2, 2, 4-trimethyl- 1, 3-pentanediol diisobutyrate; and said coalescing agent is present in an amount in the range of 5 mass % to 20 mass % with respect to the total mass of the composition.

16. The composition as claimed in claim 9, wherein said silane coupling agent is at least one selected from the group consisting of epoxy functional silane oligomer and epoxy functional silane monomer; and said silane coupling agent is present in an amount in the range of 0.1 mass % to 1 mass % with respect to the total mass of the composition.

17. The composition as claimed in claim 9, wherein said superplasticizer is at least one selected from the group consisting of Polycarboxylate ether, sodium polyacrylate and ammonium poly acrylates; and said superplasticizer is present in an amount in the range of 0.01 mass % to 1.5 mass % with respect to the total mass of the composition.

18. The composition as claimed in claim 1 comprises at least one gypsum retarder.

19. The composition as claimed in claim 18, wherein said gypsum retarder is at least one selected from the group consisting of polyamides modified with calcium compounds and proteins; and said gypsum retarder is present in an amount in the range of 0.01 mass % to 0.5 mass% with respect to the total mass of the composition.

20. The composition as claimed in claim 1 comprises at least one cement curing catalyst and at least one biocide.

21. The composition as claimed in claim 20, wherein said cement curing catalyst is at least one selected from the group consisting of calcium formate, calcium methanoate, calcium chloride and the combinations with lime; and said cement curing catalyst is present in an amount in the range of 0.5 mass % to 3 mass% with respect to the total mass of the composition.

22. The composition as claimed in claim 20, wherein said biocide is at least one selected from the group consisting of hen /imidazole carbamate, 2-n-Octyl-4-isothiazolin-3- ones and urea derivative; and said biocide is present in an amount in the range of 0.1 mass % to 1 mass % with respect to the total mass of the composition.

23. The composition as claimed in claim 1 comprises at least one solvent.

24. The composition as claimed in claim 23, wherein said solvent is water; and said solvent is present in an amount in the range of 30 mass % to 40 mass % with respect to the total mass of the composition.

25. The composition as claimed in claim 1, wherein said composition is characterized by having: a) a solid content is in the range of 30 mass% to 35 mass%; b) a viscosity is in the range of 55000cps to65000 cps at 25° C; c) pH is in the range of 8.5 to 9.5; and d) a specific gravity is in the range of 0.8 to 1.2 at 25° C.

26. A process for the preparation of a multifunctional adhesive composition, said process comprising the following steps: a) mixing, a predetermined amount of at least one first additive in a predetermined amount of at least one solvent in a vessel at a first predetermined speed for a first predetermined time period to obtain a first mixture; b) adding sequentially a predetermined amount of at least one second additive, optionally, a predetermined amount of at least one biocide, optionally, a predetermined amount of at least one gypsum retarder, and optionally, a predetermined amount of at least one cement curing catalyst to said first mixture at a second predetermined speed for a second predetermined time period to obtain a second mixture; c) adding sequentially a predetermined amount of at least one microfiber, a predetermined amount of at least one water repellent additive, and a predetermined amount of at least one silane hydrophobizing agent to said second mixture under stirring for a third predetermined time period at a third predetermined speed to obtain a third mixture; and d) mixing sequentially a predetermined amount of at least one hydrophobic polymer emulsion, a predetermined amount of at least one third additive to said third mixture at a fourth predetermined speed for a fourth predetermined time period to obtain the multifunctional adhesive composition.

27. The process as claimed in claim 26, wherein said first additive is at least one selected from a preservative, a thickener and a defoamer; said second additive is at least one selected from a dispersant, a superplasticizer and a wetting agent; and said third additive is at least one selected from a coalescing agent, and a silane coupling agent.

28. The process as claimed in claim 27, wherein said preservative is at least one selected from the group consisting of a solution of chloromethyl-/methylisothiazolone, and formaldehyde, Benzisothiazolinone; said thickener is at least one selected from the group consisting of hydroxyethyl cellulose, hydroxy propyl cellulose, and poly vinyl alcohols; and said defoamer is at least one selected from the group consisting of mineral oil defoamer composition and silicone oil defoamer composition.

29. The process as claimed in claim 27, wherein said dispersant is at least one selected from the group consisting of 2-amino-2-methyl-l -propanol solution (95%), and ammonia; said superplasticizer is at least one selected from the group consisting of Polycarboxylate ether, sodium polyacrylate and ammonium poly acrylates; and said wetting agent is selected from fatty alcohol ethoxylates

30. The process as claimed in claim 27, wherein said coalescing agent is at least one selected from the group consisting of 2, 2, 4-trimethyl- 1,3-pentanediol monoisobutyrate and 2, 2, 4-trimethyl- 1,3-pentanediol diisobutyrate; and said silane coupling agent is at least one selected from the group consisting of epoxy functional silane oligomer and epoxy functional silane monomer.

31. The process as claimed in claim 26, wherein said solvent is water.

32. The process as claimed in claim 26, wherein said biocide is at least one selected from the group consisting of benzimidazole carbamate, 2-n-Octyl-4-isothiazolin-3-ones and urea derivative; said gypsum retarder is at least one selected from the group consisting of polyamides modified with calcium compounds and proteins; and said cement curing catalyst is at least one selected from the group consisting of calcium formate, calcium methanoate, calcium chloride and the combinations with lime.

33. The process as claimed in claim 26, wherein said microfiber is at least one selected from the group consisting of polyester fibres, acrylic fibers and nylon fibres; said water repellent additive is a mixture of silane and siloxane in an emulsion form; and said silane hydrophobizing agent is polysiloxane modified with functional silicone resin.

34. The process as claimed in claim 26, wherein said hydrophobic polymer emulsion is prepared by using at least one monomer selected from the group consisting of styrene, acrylic acid, an acrylate, (meth)acrylic acid), methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, glycidyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, a long chain alkyl (meth)acrylate having an alkyl group with C₉-C₁₃ atoms, vinyl 2-ethylhexanoate, vinyl laurate, vinyl stearate, vinyl alkyl or aryl ethers with (C₉-C₃₀) alkyl groups, vinyl 2-ethyl hexanoate, vinyl neo-nonanoate, vinyl neo-decanoate, vinyl neo- undecanoate, and vinyl neo- dodecanoate.

35. The process as claimed in claim 26, wherein said first and second predetermined time period is in the range of 2 to 8 min; said third predetermined time period is in the range of 15 to 25 min; and said fourth predetermined time period is in the range of 10 to 20 min.

36. The process as claimed in claim 26, wherein said first and second predetermined speed is in the range of 300 to 500 rpm, said third predetermined speed is in the range of 1000 to 1500 rpm; and said fourth predetermined speed is in the range of 400 to 600 rpm.

37. The process as claimed in claim 26, wherein the so obtained multifunctional composition is in liquid form.

38. The process as claimed in claim 26, wherein the so obtained multifunctional composition is blended with a predetermined amount of white cement and dolomite (500 mesh) in a sigma mixer for a time period in the range of 5 min to 15 min to obtain the multifunctional adhesive composition in the form of a powder.

39. The process as claimed in claim 38, wherein said white cement is present in an amount in the range of 20 mass% to 40 mass% with respect to the total mass of the composition.

40. The process as claimed in claim 38, wherein said dolomite is present in an amount in the range of 60 mass% to 90 mass% with respect to the total mass of the composition.