TWI863594B - Cement mortar composition and use thereof - Google Patents

Abstract

The present invention provides a cement mortar composition, wherein the composition comprises first rubber particles, second rubber particles, a water-based hollow resin, cement and construction aggregate, and optionally comprises additives. The cement mortar composition is used for a building material and can have good sound insulation effects.

Description

Cement mortar composition and use thereof

The present invention relates to a cement mortar composition, in particular to a mortar composition which can be used as a sound insulation material.

At present, due to the dense population and increasing shortage of land resources in urban areas, most of the residential buildings are high-rise and densely packed. However, in high-rise and densely packed buildings, there is often noise generated by collision and friction between the floors. In order to improve the quality of living, the demand for building sound insulation performance is increasing day by day, and even the regulations on impact sound reduction performance are clearly included in the building laws and regulations. Therefore, the sound insulation problem of the individual floors of collective housing has always been a topic that the industry has been working hard to improve.

The current common practice of enhancing building sound insulation is to configure a rubber sound insulation layer (or sound insulation pad) on the sub-floor. The sound insulation layer is set on the cement layer of the reinforced concrete structure (RC floor) through an adhesive layer, and then a waterproof isolation layer and a cement mortar layer (about 5 cm cement pressure layer) are laid on the sound insulation layer in sequence. Then, surface decoration materials such as tiles are glued on the top layer. This multi-layer structure is used to achieve the sound insulation effect of the floor.

However, this conventional method is complicated and involves at least four construction procedures (i.e., applying adhesive, rubber layer, isolation layer and cement pressure layer, etc.), and usually takes more than two weeks of construction time, which is labor-intensive and time-consuming, resulting in high costs. In addition, the strength between the rubber sound insulation pad and the cement mortar layer above it is also suspected to be poor, resulting in the risk of cracking, protrusions, hollowness or collapse of the surface decoration material.

Therefore, the industry still needs a building sound insulation material that, in addition to having good sound insulation effects, is easy to construct and operate, can reduce complex process steps, shorten construction time, and achieve the effect of saving time, labor, and cost. In addition, the industry also hopes to develop a sound insulation material that can provide good firmness and adhesion when placed between RC floor slabs and surface decorative materials.

In view of this, this application is the research and development result for the aforementioned various technical problems.

In one aspect, the present invention provides a cement mortar composition comprising: (a) first rubber particles having a particle size in the range of 0.01 mm to less than 1.2 mm; (b) second rubber particles having a particle size in the range of 1.2 mm to 6 mm; (c) water-based hollow resin; (d) cement; and (e) sand.

In another aspect, the present invention provides a use of the cement mortar composition for forming a sound insulation structure of a building.

In another aspect, the present invention provides a sound insulation structure, which is prepared using the cement mortar composition provided by the present invention.

In another aspect, the present invention provides a cement mortar additive composition,

Each aspect or embodiment of the invention disclosed herein is intended to be combined with all other disclosed aspects or embodiments of the invention, individually or together in all possible combinations thereof.

In this specification and the scope of the patent application, unless the context clearly requires otherwise, the singular forms "a", "an" and "the" include plural forms. Unless otherwise claimed, the use of any and all examples or exemplary language (such as "such as") provided herein is only intended to better illustrate the present invention and does not limit the scope of the present invention. The language in this specification should not be interpreted as indicating that any non-claimed element is essential to the implementation of the present invention.

Unless otherwise defined below, the meanings and intentions of all technical terms and scientific terms used herein are the same as those commonly understood by those skilled in the art. Reference to the technical intentions used herein refers to the technology commonly understood in the art, including those changes in technology or replacements of equivalent technology that are obvious to those skilled in the art. Although it is believed that the following terms are well understood by those skilled in the art, the following definitions are still set forth to better explain the present invention.

As used herein, the terms "include", "comprising", "having", "containing" or "involving" and other variations thereof herein are inclusive or open-ended and do not exclude other unlisted items.

"Solid matter" or "solid content" in this specification and patent application refers to the mass percentage of non-volatile components in the material, that is, the content of non-volatile components. "Solid weight (amount)" in this specification and patent application refers to the weight of non-volatile components in the material.

The present invention provides a cement mortar composition comprising: (a) first rubber particles having a particle size in the range of about 0.01 mm to less than 1.2 mm; (b) second rubber particles having a particle size in the range of 1.2 mm to about 6 mm; (c) water-based hollow resin; (d) cement; and (e) sand.

Rubber particles have excellent damping properties, which can reduce the impact force of the floor slab and reduce the impact sound. The inventor of this case found that adding at least two rubber particles of different particle size ranges to the composition of the present invention can form a geometric stack, increase the space of many pores, and increase the porosity of the cement mortar layer structure formed by it, effectively reducing the conduction of sound and further increasing the sound insulation effect.

The first rubber particles preferably have a particle size in the range of about 0.03 mm to about 1.0 mm, and more preferably have a particle size in the range of about 0.05 mm to about 0.8 mm.

In some embodiments, the material of the first rubber particles includes styrene butadiene rubber, butyl rubber, nitrile rubber, acrylic rubber, diacetylene rubber, chloroprene rubber, fluororubber, natural rubber, polyurethane rubber, silicone rubber or a combination thereof. In a preferred embodiment, the material of the first rubber particles includes styrene butadiene rubber.

The second rubber particles preferably have a particle size in the range of 1.5 mm to 5 mm, and more preferably have a particle size in the range of 1.8 mm to 4 mm.

In some embodiments, the material of the second rubber particles includes styrene butadiene rubber, butyl rubber, nitrile rubber, acrylic rubber, diacetylene rubber, chloroprene rubber, fluororubber, natural rubber, polyurethane rubber, silicone rubber or a combination thereof. In a preferred embodiment, the material of the second rubber particles includes styrene butadiene rubber.

In some embodiments, the first rubber particles and/or the second rubber particles can be prepared from rubber recycled from tires, thereby further improving environmental protection and achieving the effect of energy saving and carbon reduction.

In some embodiments, the content of the first rubber particles is 1 to 30% by weight, preferably 5 to 25% by weight, and more preferably 12 to 20% by weight, based on the total solid weight of the composition of the present invention. In some embodiments, the content of the second rubber particles is 1 to 20% by weight, preferably 3 to 15% by weight, and more preferably 5 to 12% by weight, based on the total solid weight of the composition of the present invention.

According to some embodiments of the present invention, the weight ratio of the first rubber particles to the second rubber particles is 10:1 to 1:10, preferably 6:1 to 1:2, and more preferably 3:1 to 1:1. If the weight ratio of the first rubber particles to the second rubber particles is too low, the structural strength of the cement mortar layer formed will be low, and if the weight ratio of the first rubber particles to the second rubber particles is too high, the sound insulation effect of the cement mortar layer will be reduced.

The water-based hollow resin refers to a resin material with a hollow structure, preferably a spherical structure, and the resin material can be dispersed in water. In some embodiments, the particle size of the water-based hollow resin is about 300 to 600 nm, preferably 400 to 500 nm. The solid content of the water-based hollow resin itself is about 20% to about 40%. The hollowness of the water-based hollow resin is about 30 to about 50% (hollowness refers to the percentage of the volume of the hollow area to the total volume of the particle).

In some embodiments, the water-based hollow resin can be a water-based hollow acrylic resin, a water-based hollow styrene resin, a water-based hollow polyurethane resin, a water-based hollow epoxy resin, a water-based hollow polyester resin or a combination thereof. In some embodiments of the present invention, the water-based hollow resin comprises a water-based hollow acrylic resin.

The water-based hollow resin can further provide more porosity, reduce the conduction of sound, and the spherical structure of the water-based hollow resin can change the conduction direction of sound, scatter sound waves, reduce the volume and achieve a sound insulation effect. In some embodiments, the solid content of the water-based hollow resin is 0.1 to 5% by weight, preferably 1 to 3% by weight, based on the total solid weight of the composition of the present invention.

There is no particular limitation on the cement and sand used in the composition of the present invention. Cement and sand commonly used in building materials can be used as components of the composition of the present invention.

In some embodiments, the solid content of the cement is about 10 to about 30 wt %, preferably about 15 to 20 wt %, based on the total solid weight of the composition of the present invention.

In some embodiments, the solid content of the sand is about 30 to about 70% by weight, preferably about 40 to 50% by weight, based on the total solid weight of the composition of the present invention. In order to make the composition have better mixing uniformity and adhesion, in some embodiments of the present invention, the cement mortar composition of the present invention may further include (f) a water-based acrylic resin. The water-based acrylic resin contains water but does not have a hollow structure. In some embodiments, the water-based acrylic resin has a glass transition temperature (Tg) of less than 0°C.

In some embodiments, the solid content of the waterborne acrylic resin is 0.1 to 15% by weight, preferably 1 to 10% by weight, based on the total solid weight of the composition of the present invention. In some embodiments, the solid content of the waterborne acrylic resin itself is about 40% to about 60%.

In some embodiments, the resin of the waterborne acrylic resin may be derived from a polymer of methyl methacrylate, methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, acrylic acid, methacrylic acid, styrene, or a copolymer of a combination of two or more thereof.

To further enhance the dispersing effect of the composition, according to some embodiments of the present invention, the cement mortar composition of the present invention further comprises (g) a surfactant.

In some embodiments, the surfactant comprises an ionic surfactant, such as sodium lauryl sulfate (SLS) or sodium dodecyl benzene sulfonate (SDBS); or a non-ionic surfactant, such as fatty alcohol polyoxyethylene ether, allyl-terminated block copolymers of ethylene oxide (EO) and propylene oxide (PO), etc. In some embodiments, the surfactant comprises polyoxyethylene lauryl alcohol ether.

In some embodiments, the solid content of the surfactant is 0.1 to 5 wt %, preferably 0.5 to 3 wt %, based on the total solid weight of the composition of the present invention.

The cement mortar composition of the present invention can be used as a building material, for example, as a coating in a building floor structure, a coating in a wall structure, or for painting walls, pasting tiles, bricks, or repairing concrete cracks.

The cement mortar composition of the present invention can achieve good sound insulation effect by selecting and matching two rubber particles with different particle size ranges and water-based hollow resin. For example, it can reduce impact sound above 15 decibels or 17 decibels, and even reduce impact sound above 20 decibels, 23 decibels or 25 decibels. In addition, this combination can also maintain the strength and fixation of cement after subsequent construction.

When the cement mortar composition of the present invention is used as a cement coating in the floor structure of a building, since only the cement coating is needed to achieve a good sound insulation effect, compared with the conventional method of using a rubber sound insulation pad, the use of the cement mortar composition of the present invention as a sound insulation layer can reduce multiple process steps, shorten the construction time, and achieve the effect of saving time, labor, and cost. In addition, when the cement mortar composition of the present invention is used as a cement coating of a building, it can also have excellent compressive strength, and can provide good firmness between the RC floor and the surface decoration material, avoiding the risk of cracking, protruding or collapsing of the surface decoration material.

Therefore, in another aspect, the present invention provides a use of the cement mortar composition, which is used to form a sound insulation device for a building. The sound insulation device has a good sound insulation effect, and when a coating layer with a thickness of 2 to 5 cm is formed, the impact sound of 15 decibels or more than 17 decibels can be reduced, and even the impact sound of 20 decibels, 23 decibels or more than 25 decibels can be reduced.

In another aspect, the present invention provides a sound insulation device, which is prepared using the cement mortar composition provided by the present invention.

In another aspect, the present invention also provides a cement mortar additive composition, which comprises (i) a water-based hollow resin, (ii) a water-based acrylic resin and (iii) a surfactant, wherein the technical features of the water-based hollow resin, the water-based acrylic resin and the surfactant are the same as those of the (c) water-based hollow resin, (f) water-based acrylic resin and (g) surfactant described above.

The additive composition of the present invention is used as an additive for the cement mortar composition of the present invention. That is, when the cement mortar additive composition is added to a composition containing the aforementioned (a) first rubber particles, the aforementioned (b) second rubber particles, (d) cement and (e) sand, the cement mortar composition of the present invention can be prepared.

The following embodiments are used to further illustrate the present invention, but are not intended to limit the scope of the present invention. Any modifications and changes that can be easily achieved by anyone familiar with this technology are included in the scope of the disclosure of the description of this case and the scope of the attached patent application.

Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

< Preparation of water-based hollow resin > : The water-based hollow resin is synthesized in two stages. First, 30 parts by weight of acrylic acid, 60 parts by weight of methyl acrylate, 10 parts by weight of butyl acrylate, 2 parts by weight of sodium alkyl sulfate emulsifier and 70 parts by weight of water are mixed together to form a pre-emulsion 1. 1 part by weight of aqueous potassium persulfate initiator is dissolved in 20 parts by weight of water, and the pre-emulsion 1 and potassium persulfate solution are dripped into a reactor at about 80°C for reaction. The dripping reaction time is about 60 minutes. After 60 minutes of reaction, the first stage polymer is synthesized. 800 parts by weight of styrene monomer, 4 parts by weight of sodium alkyl sulfate and 600 parts by weight of water are mixed to form a pre-emulsion 2, and 4 parts by weight of aqueous potassium persulfate initiator are dissolved in 80 parts by weight of water. At about 80°C, the pre-emulsion 2 and potassium persulfate solution are dripped into the first stage polymer respectively. The dripping reaction time is 120 minutes. After 120 minutes of reaction, the shell of the first stage polymer is formed. Ammonia water is then added to adjust the pH to 8.0 for neutralization, and then the mixture is expanded at a high temperature of 90°C to finally form a water-based hollow resin with a particle size of 300-1000 nm and a hollow structure (the solid content is about 30%). The ratio of the above-mentioned reactants is used to prepare the required water-based hollow resin of different weights.

< Preparation of water-based acrylic acid > : Using emulsion polymerization, 2 parts by weight of acrylic acid, 50 parts by weight of methyl acrylate, 50 parts by weight of butyl acrylate, 60 parts by weight of water and 2 parts by weight of sodium alkyl sulfate emulsifier are mixed and stirred to form a pre-emulsion 3. At about 80°C, 1 part by weight of aqueous potassium persulfate initiator is dissolved in 20 parts by weight of 80°C water, and the pre-emulsion 3 and potassium persulfate solution are dripped into a reactor at about 80°C for reaction. After the dripping reaction time is 4 hours, a water-based acrylic resin is formed by reaction, and its solid content is about 50%. The ratio of the above-mentioned reactants is used to prepare the required water-based acrylic resin of different weights.

< Preparation of cement mortar > : The first rubber particles (0.25-0.6 mm particle size, manufactured by Junlong Rubber Industry Co., Ltd.), the second rubber particles (2-4 mm particle size, manufactured by Junlong Rubber Industry Co., Ltd.), sand (dry-mixed cement sand), cement (Portland cement) and surfactant (polyoxyethylene lauryl alcohol ether) were added to a cement mortar mixer according to the amounts (in kilograms (kg)) in Tables 1-1 to 1-3 and pre-mixed for about 5 minutes. Then, the water-based hollow resin, water-based acrylic acid and water were added to the aforementioned cement mortar mixer according to the amounts (in kilograms (kg)) in Tables 1-1 to 1-3 and stirred for 15 minutes to obtain the cement mortar compositions of each embodiment and comparative example.

Table 1-1 Project Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 (a) First rubber particles 16.4 13.1 15 15.6 15 15 13.1 (b) Second rubber particles 3 5.4 7.9 8.4 7.9 7.9 5.4 (c) Water-based hollow resin (solid content about 30%) 4.9 3.8 5 7 5 5 12 (d) Cement 12.9 13.2 14.3 14 14.3 14.3 13.2 (e) Sand 38.8 39.3 42.8 41.9 42.8 42.8 39.3 (f) Water-based acrylic acid (solid content about 50%) 12.4 9.6 5 7 0 5 9.6 (g) Surfactant 1.2 1.2 1.2 1.2 1.2 0 1.2 water 13.4 14.4 10.1 10.2 10.1 10.1 11 Total weight(Kg) 103 100 101.3 105.3 96.3 100.1 104.8 (c) Solid weight 1.47 1.14 1.5 2.1 1.5 1.5 3.6 (f) Solid weight 6.2 4.8 2.5 3.5 0 2.5 4.8 Total solid weight (Kg) 79.97 78.14 85.2 86.7 82.7 84 80.6 (a)/Total solid weight 20.5% 16.8% 17.6% 18.0% 18.1% 17.9% 16.3% (b)/Total solid weight 3.8% 6.9% 9.3% 9.7% 9.6% 9.4% 6.7% (c)/Total solid weight 1.8% 1.5% 1.8% 2.4% 1.8% 1.8% 4.5% (d)/Total solid weight 16.1% 16.9% 16.8% 16.1% 17.3% 17.0% 16.4% (e)/Total solid weight 48.5% 50.3% 50.2% 48.3% 51.8% 51.0% 48.8% (f)/Total solid weight 7.8% 6.1% 2.9% 4.0% 0.0% 3.0% 6.0% (g)/Total solid weight 1.5% 1.5% 1.4% 1.4% 1.5% 0.0% 1.5%

Table 1-2 Project Embodiment 8 Embodiment 9 Embodiment 10 Embodiment 11 Comparison Example 1 Comparison Example 2 Comparison Example 3 (a) First rubber particles 15 7 7 15.6 0 5 0 (b) Second rubber particles 7.9 8.4 12 8.4 0 1 0 (c) Water-based hollow resin (solid content about 30%) 5 7 7 2.5 0 0 4.9 (d) Cement 14.3 14 14 14 19.8 18.6 16.3 (e) Sand 42.8 41.9 41.9 41.9 59.6 56 49 (f) Water-based acrylic acid (solid content about 50%) 25 7 7 7 0 0 12.4 (g) Surfactant 1.2 1.2 1.2 1.2 0 0 1.2 water 10.1 8 10.2 10.2 20.6 19.3 16.2 Total weight(Kg) 121.3 94.5 100.3 100.8 100 99.9 100 (c) Solid weight 1.5 2.1 2.1 0.75 0 0 1.47 (f) Solid weight 12.5 3.5 3.5 3.5 0 0 6.2 Total solid weight (Kg) 95.2 78.1 81.7 85.35 79.4 80.6 74.17 (a)/Total solid weight 15.8% 9.0% 8.6% 18.3% 0.0% 6.2% 0.0% (b)/Total solid weight 8.3% 10.8% 14.7% 9.8% 0.0% 1.2% 0.0% (c)/Total solid weight 1.6% 2.7% 2.6% 0.9% 0.0% 0.0% 2.0% (d)/Total solid weight 15.0% 17.9% 17.1% 16.4% 24.9% 23.1% 22.0% (e)/Total solid weight 45.0% 53.6% 51.3% 49.1% 75.1% 69.5% 66.1% (f)/Total solid weight 13.1% 4.5% 4.3% 4.1% 0.0% 0.0% 8.4% (g)/Total solid weight 1.3% 1.5% 1.5% 1.4% 0.0% 0.0% 1.6%

Table 1-3 Project Comparison Example 4 Comparison Example 5 Comparison Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 (a) First rubber particles 0 0 twenty four 16.4 12 13.1 16.4 (b) Second rubber particles 3 twenty four 0 30 20 5.4 0 (c) Water-based hollow resin (solid content about 30%) 4.9 7 7 4.9 7 0 4.9 (d) Cement 12.9 14 14 12.9 14 13.2 12.9 (e) Sand 38.8 41.9 41.9 38.8 41.9 39.3 38.8 (f) Water-based acrylic acid (solid content about 50%) 12.4 7 7 12.4 7 9.6 12.4 (g) Surfactant 1.2 1.2 1.2 1.2 1.2 1.2 1.2 water 11 10.2 10.2 11 10.2 12 13.4 Total weight(Kg) 84.2 105.3 105.3 127.6 113.3 93.8 100 (c) Solid weight 1.47 2.1 2.1 1.47 2.1 0 1.47 (f) Solid weight 6.2 3.5 3.5 6.2 3.5 4.8 6.2 Total solid weight (Kg) 63.57 86.7 86.7 106.97 94.7 77 76.97 (a)/Total solid weight 0.0% 0.0% 27.7% 15.3% 12.7% 17.0% 21.3% (b)/Total solid weight 4.7% 27.7% 0.0% 28.0% 21.1% 7.0% 0.0% (c)/Total solid weight 2.3% 2.4% 2.4% 1.4% 2.2% 0.0% 1.9% (d)/Total solid weight 20.3% 16.1% 16.1% 12.1% 14.8% 17.1% 16.8% (e)/Total solid weight 61.0% 48.3% 48.3% 36.3% 44.2% 51.0% 50.4% (f)/Total solid weight 9.8% 4.0% 4.0% 5.8% 3.7% 6.2% 8.1% (g)/Total solid weight 1.9% 1.4% 1.4% 1.1% 1.3% 1.6% 1.6%

< Production of sound insulation floor > : A frame mold with a size of 1.5m x 1.5m and a thickness of 3cm is first assembled on the floor of the second floor of the building, and the cement mortar of the embodiment or the comparative example is poured into the mold. The mortar directly contacts the second floor floor. After the mortar is naturally dried and hardened for 7 days, the mold frame is removed for demolding.

< Volume decibel test > : On the second floor floor, a 5 kg iron block with a volume of about 7 cm x 7 cm x 5 cm was placed 1 meter above the hardened mortar layer. It was dropped by gravity and hit the hardened cement mortar layer. A radio decibel meter was placed on the first floor directly below the cement mortar layer. The decibel meter was 1 meter above the ground on the first floor. The maximum volume produced when the iron block on the second floor hit the mortar layer was recorded. A total of 20 hits were made, and the volume decibel value was the average of these 20 hits. The building floor height is about 3.2 meters. The test results are shown in Tables 2-1 to 2-3.

< Cement mortar strength > : After the cement mortar layers formed by each embodiment and comparative example were hit by iron blocks 20 times, the appearance of the cement mortar layers was observed. If there were no turtle cracks, cracks, and no obvious changes in appearance, it was defined as "no abnormality". If fine cracks less than 2 mm were generated, and the total number was less than 5, it was defined as "very small cracks". If cracks greater than 2 mm or more than 5 were generated, it was defined as "obvious cracks". If the mortar layer was severely detached and separated, or was obviously concave, it was defined as "severely broken". The test results are shown in Tables 2-1 to 2-3 below.

Table 2-1 Project Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 Sound insulation, measured in decibels 75 74 72 69 72 74 72 Cement mortar strength No abnormality No abnormality No abnormality No abnormality Very small cracks No abnormality Very small cracks

Table 2-2 Project Embodiment 8 Embodiment 9 Embodiment 10 Embodiment 11 Comparison Example 1 Comparison Example 2 Comparison Example 3 Sound insulation, measured in decibels 74 72 71 75 91 84 86 Cement mortar strength No abnormality No abnormality Very small cracks No abnormality No abnormality No abnormality No abnormality

Table 2-3 Project Comparison Example 4 Comparison Example 5 Comparison Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Sound insulation, measured in decibels 79 72 80 69 72 78 79 Cement mortar strength No abnormality Severely broken No abnormality Severely broken Visible cracks Very small cracks No abnormality

As can be seen from the above table, compared with the general cement mortar composition containing cement and sand (such as Comparative Example 1), the cement mortar composition of the embodiment of the present invention can achieve a good sound insulation effect. Furthermore, the cement mortar composition of the present invention also exhibits excellent compressive strength and can avoid breakage or obvious cracks.

The above embodiments are only for illustrative purposes to illustrate the effects of the present invention and to explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or arrangements that can be easily accomplished by anyone familiar with the present technology without violating the technical principles and spirit of the present invention are within the scope of the present invention. Therefore, the scope of protection of the present invention is as listed in the attached patent application scope.

Claims (10)

A cement mortar composition comprising: (a) first rubber particles having a particle size in the range of 0.01 mm to less than 1.2 mm; (b) second rubber particles having a particle size in the range of 1.2 mm to 6 mm; (c) water-based hollow resin, wherein the hollowness of the water-based hollow resin is about 30 to about 50%; (d) cement; and (e) sand; wherein, based on the total solid weight of the composition, the content of the first rubber particles is 5 to 25% by weight, the content of the second rubber particles is 3 to 15% by weight, the solid content of the water-based hollow resin is 1 to 3% by weight, the solid content of the cement is about 10 to about 30% by weight, and the solid content of the sand is about 30 to about 70% by weight. The composition of claim 1 further comprises (f) a water-based acrylic resin. The composition of claim 1 further comprises (g) a surfactant. A composition as claimed in any one of claims 1 to 3, wherein the material of the first rubber particles and/or the second rubber particles comprises styrene butadiene rubber, butyl rubber, nitrile rubber, acrylic rubber, butadiene rubber, chloroprene rubber, fluororubber, natural rubber, polyurethane rubber, silicone rubber or a combination thereof. A composition as claimed in any one of claims 1 to 3, wherein the water-based hollow resin is a water-based hollow acrylic resin, a water-based hollow styrene resin, a water-based hollow polyurethane resin, a water-based hollow epoxy resin, a water-based hollow polyester resin or a combination thereof. A composition as claimed in any one of claims 1 to 3, wherein the content of the first rubber particles is 12 to 20% by weight, and the content of the second rubber particles is 5 to 12% by weight, based on the total solid weight of the composition. A composition as claimed in claim 2, wherein the solid content of the waterborne acrylic resin is 0.1 to 15% by weight based on the total solid weight of the composition. The composition of claim 3, wherein the content of the surfactant is 0.1 to 5% by weight based on the total solid weight of the composition. A composition as claimed in any one of claims 1 to 3, wherein the particle size of the aqueous hollow resin is about 300 to 600 nm. A use of a cement mortar composition as claimed in claims 1 to 9, which is used to form a sound insulation structure for a building.