JP2010077424A - Granular material for coating, and heat insulating coating or sound insulating coating containing granular material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a granular material for a coating which has particles not easily broken when mixed with other coating ingredients, and acts as a hollow form even if cracked partially, readily giving smooth surface, and capable of providing sufficient heat insulating and sound insulating functions with addition of a smaller amount than conventional ones; and to provide the coating comprising the same. <P>SOLUTION: The granular material for the coating is fine hollow silica particles to be compounded in a coating, has an average particle size of 5-100 μm, in which the particle has an inner space composed of a plurality of closed cells partitioned with partitioning walls; the granular material for coating preferably has a floating residual rate at 8 MPa hydrostatic pressure of 50% or more, a water absorption rate of 3% or less, an SiO<SB>2</SB>content of 65-90 mass%, a weight per unit volume of 0.16-0.35 g/cm<SP>3</SP>, and a particle size of 1-50 μm when used for heat insulation and a particle size of 1-200 μm when used for sound insulation. The coating containing the granular material is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a granule for paint composed of siliceous hollow fine particles, and particularly to a granule for paint excellent in heat insulation and sound insulation and a paint using the granule.

In recent years, paints having various functions have been developed and marketed. For example, from the viewpoint of energy saving, in order to block heat from the roof, a coating material having heat insulating properties and heat blocking properties has been developed by mixing a material that blocks or reflects heat and infrared rays into the coating material. Specifically, a material such as dense silicide that reflects heat and infrared rays in the paint (for example, see Patent Document 1), and dense ceramic particles such as titanium oxide and aluminum oxide (for example, see Patent Document 2). ) Is added to obtain the effect.

Properties required for such materials are required to be lightweight and easy to obtain smoothness of the construction surface from the viewpoint of durability and paintability as well as heat insulation and heat shielding functions. . As additive particles advantageous for obtaining light weight and smoothness of a construction surface, a method of mixing organic resinous hollow particles of several μm to several tens of μm is known (see, for example, Patent Document 3).

However, when the organic resin is exposed to high heat for a long time, it cannot oxidize and maintain a hollow state, resulting in performance deterioration and deformation. Moreover, even if a metal particle has a hollow structure, there is a limit to weight reduction and heat insulation, and since it is inferior in corrosion resistance, the deterioration over time is large.

On the other hand, when non-metallic inorganic hollow particles such as glass and crystalline compounds are used, in addition to being lightweight, heat resistance and durability are good (see, for example, Patent Documents 4 to 5). However, since non-metallic inorganic hollow particles have substantially no elasticity and low strength, when mixed with a highly viscous paint, a shearing force is often applied to break the hollow particles. Since the broken particles cannot obtain the predetermined performance, in reality, a larger amount of hollow particles is required than the amount of broken particles. However, it is preferable that the amount of hollow particles added is small because a sufficient amount of adhesive components and the like that affect the paintability as a paint can be secured, so that a large amount of hollow fine particles is disadvantageous from the viewpoint of paintability.

On the other hand, when hollow particles having a large particle diameter are used, there is a disadvantage that the smoothness of the paint is impaired. Further, in the case of hollow particles composed of single bubbles, the thinner the outer shell of the particle, the lower the barrier function against heat radiation, and the more easily convection heat propagates in the voids. And, the thicker the particle outer shell, or the lower the void volume ratio in the particle, the more easily the heat conduction becomes, so it is difficult to obtain a paint having a high heat insulation and heat shielding effect without sacrificing the paintability. There's a problem.

When high-strength hollow particles having high damage resistance are used (see, for example, Patent Document 6), generally high-melting-point components such as silica, alumina, and calcia are used to produce high-strength ceramic particles. It must be contained in a relatively large amount, and low melting point components such as alkali metal compounds, which are low strength factors, are less likely to be heated and foamed. Since the volume is large and the internal volume ratio of the bubbles relative to the particles is small, the heat insulating property and the sound insulating property tend to deteriorate.

Specifically, hollow fine particles having a silica content of 50 to 60% by mass and an alumina content of 40 to 45% by mass are known, which are lightweight and have high strength (bulk specific gravity 0.35 g / cm ³ , compressive strength 700 kg / cm ^3. (For example, Patent Document 7). However, silica alumina hollow fine particles having the above-mentioned bulk specific gravity and compressive strength are extremely difficult to obtain by a usual production method by melt foaming, and are not general.

JP 2007-137950 A Japanese Patent Laid-Open No. 2-185572 JP 2001-348530 A JP-A-8-127739 JP 2008-169252 A JP 2008-155659 A JP 2005-307129 A

The present invention solves the above-mentioned problems in conventional hollow fine particles, and when blended in a paint component, the particles are difficult to break and can retain the function of a hollow state even if cracks or the like partially occur. It can be easily smoothed during construction, can form a paint with high heat resistance, and has sufficient heat insulation and sound insulation functions with less addition than conventional products. A granular material for coating material and its coating material are provided.

The present invention relates to a coating material granule that solves the above-described problems with the following configuration, and a coating material using the granule.
[1] Silica hollow fine particles blended in a paint, having an average particle diameter of 5 to 100 μm, and having an internal space formed by a plurality of closed cells separated by partition walls Granules.
[2] The paint granule according to the above [1], wherein the residual rate of 8 MPa hydrostatic pressure levitation is 50% or more and the water absorption is 3% or less.
[3] The granule for paint according to the above [1] or [2], wherein the chemical component has an SiO ₂ content of 65 to 90% by mass.
[4] The coating material granule according to the above [1] to [3], having a weight of 0.16 to 0.35 g / cm ³ .
[5] The coating material granule according to any one of [1] to [4] above, comprising 60 or more of 100 particles having an internal space formed by a plurality of closed cells separated by partition walls.
[6] A granule for heat-insulating paint, which is the paint granule described in any one of [1] to [5] above, and is made of a paint granule having a particle diameter of 1 to 50 μm.
[7] A particle material for sound insulation paint, which is the paint particle material according to any one of [1] to [5] above, and is made of a paint particle material having a particle diameter of 1 to 250 μm.
[8] A heat insulating paint comprising the granule material for heat insulating paint described in [6].
[9] A sound insulating paint comprising the sound insulating paint granule according to [7].

Since the granular material for coating (hollow fine particles) of the present invention has partition walls in the internal space of the particles, the particle strength is higher than that of hollow particles composed of a single space without partition walls. For this reason, when mixing hollow paint particles with a high viscosity paint and stirring, the low-strength granules are easily broken by shearing by stirring, but the paint granules of the present invention are broken because they are strong. It is difficult to achieve uniform mixing while maintaining a hollow state.

In addition, since the granular material for coating according to the present invention has a plurality of internal spaces composed of closed cells separated by partition walls, even if local cracks or breakage occurs in the granular material, a hollow state is caused by the remaining internal space. Since it is maintained, a coating film excellent in heat insulation and sound insulation can be formed. Specifically, since it is formed of a large number of independent internal spaces with a small bubble diameter and a large number of partition walls, the heat transfer in the internal space is small (the heat conduction is less than that of dense granular materials, and heat radiation Is less than a single hollow particle and hardly causes thermal convection) and has excellent heat insulation.

Hereinafter, the present invention will be specifically described based on embodiments.
The coating material granule of the present invention is a siliceous hollow fine particle blended in the coating material, has an average particle size of 5 to 100 μm, and is formed by a plurality of closed cells in which the internal space is partitioned by partition walls. It is a granule for paints characterized by.

The granular material for coating of the present invention is hollow fine particles formed by a plurality of closed cells whose internal spaces are separated by partition walls. Preferably, the hollow fine particles have an 8 MPa hydrostatic pressure levitation residual rate of 50% or more and a water absorption rate of 3% or less.

Since the hollow fine particles of the present invention are formed by closed cells that are separated from each other by the partition walls and do not communicate with each other, the range in which water penetrates is limited even if partial cracks occur. Is a closed cell that does not open on the particle surface, and therefore has a high hydrostatic pressure levitation residual rate under pressure. The hydrostatic levitation survival rate is the ratio of the underwater buoyancy rate W2 under normal pressure after pressurization of particles pressurized under hydrostatic pressure to the underwater levitation rate (floating rate) W1 under normal pressure without pressure [the levitation residual rate = W2 / W1 × 100 (%)].

Specifically, the hollow fine particles of the present invention have, for example, a residual levitation rate of 8 MPa under hydrostatic pressure of 50% or more, preferably 60% or more, more preferably 70% or more. Those having a buoyancy remaining rate of less than 50% have a low particle strength and a small proportion of the internal space of the particles formed by closed cells.

In addition, the hollow fine particles of the present invention are preferably closed bubbles in which the closed cells do not open on the particle surface, and thus have a significantly low water absorption rate. Specifically, for example, the water absorption under normal pressure is 3% or less, preferably 1.5% or less.

In the hollow fine particles of the present invention, the fact that the internal space of the particles is formed by closed closed cells means, for example, that the residual rate of levitation under 8 MPa hydrostatic pressure is 50% or more, preferably further water absorption The rate is 3% or less.

The hollow fine particles of the present invention are low in water absorption because the internal space of the particles is formed by closed cells having no openings on the surface, have a large internal space, are lightweight, and have a high floating rate in water. In addition, since the strength is high, cracks are unlikely to occur even under pressure, and even if there are partial cracks, the internal space is divided by the partition walls, so the range of water penetration is limited, and the residual levitation rate under pressurized water is exceptional. Very expensive.

The hollow fine particles of the present invention preferably have two or more partition walls in the internal space. By having a plurality of partition walls, the strength of the particles is further improved. Specifically, for example, the compressive strength is 15 MPa or more. Therefore, the coating material granule of the present invention composed of the hollow fine particles is high in strength, because it has high strength and is not easily broken even when mechanically mixed on the production scale, and the hollow structure is maintained. It can have heat insulation performance and sound insulation performance. Since granular materials with low strength are fragile when mixed with paint and cannot maintain a hollow structure, the amount of granular materials must be increased in order to obtain sufficient heat insulation and sound insulation. Particles and fragments thereof deteriorate the performance of the coating film.

In the coating material granule of the present invention, the ratio of those having partition walls in the internal space is preferably 60 or more (about 60% or more) out of 100, and more preferably about 70% or more. If the number of particles having partition walls in the internal space is less than this, the strength of the particles is low, so that the rate of breakage when mixed with a paint increases, which is not suitable.

The coating material granule of the present invention is siliceous fine particles, and can be produced from an inorganic material mainly composed of silica (SiO ₂ ). Specifically, natural glassy rocks having a silica content of 70 to 90%, such as shirasu, pearlite, obsidian, and pine sebite, are crushed into fine particles having an average particle size of 100 μm or less, and the rock fine particles are adjusted to 900 ° C. to 1500 ° C. It can be produced by heating and foaming into hollow fine particles, and selecting the hollow fine particles whose internal spaces are separated by partition walls. Moreover, the granule for coatings of this invention is not restricted to the said natural glassy rock, For example, it can manufacture by mixing a foaming raw material with rock powder, granulating, and making it heat-foam.

The siliceous hollow fine particles used in the coating material granule of the present invention preferably have a SiO ₂ content (silica content) of 65 to 90% by mass, more preferably 70 to 80% by mass as a chemical component. . When the silica content is less than 65% by mass, it is difficult to foam with high strength, and it becomes difficult to obtain a glassy hollow structure. Furthermore, since many impurities are easily contained, uniform foaming can be achieved, which is not preferable. On the other hand, if the silica content exceeds 90% by mass, the melting point becomes high, the foaming temperature becomes high, or foaming does not occur even at a high temperature, so it is not appropriate.

As described above, the coating material granule according to the present invention is a silica vitreous particle having a large space inside formed by a plurality of closed cells in which the internal space is divided by the partition walls. The space and the partition structure can be confirmed.

Since the granule for coating material of the present invention has a plurality of internal spaces separated by partition walls, the hollow structure is maintained by the remaining internal space even when part of the surface is destroyed by shearing when mixed with the coating material. Therefore, heat insulation and sound insulation can be maintained.

On the other hand, as in the past, in the coating material granule composed of particles in which the internal space is formed by open cells even if the particles are closed pores instead of the porous particles composed of open pores, when cracks occur partially The liquid penetrates and fills the entire space inside the particles, so that the hollow state cannot be maintained, and sufficient heat insulation and sound insulation cannot be obtained.

The particle diameter of the granular material for coating of the present invention is suitably an average particle diameter of 5 to 100 μm, preferably 5 to 70 μm. When the average particle size is larger than 100 μm, the smoothness of the surface is impaired when a paint is applied, which is not preferable. On the other hand, if the average particle size is smaller than 5 μm, the particles tend to aggregate and become difficult to disperse uniformly.

When the granule (hollow fine particles) of the present invention is used for heat insulation, it is preferable that the average particle diameter is in the range of 5 to 100 μm and the particle diameter is 1 to 50 μm. As shown in Example 1 described later, the samples A1 to A6 have an average particle size of 5 to 100 μm, and thus all have good heat insulation properties, but those using the sample A2 having a maximum particle size of 50 μm have the lowest rising temperature. Excellent thermal insulation. Therefore, when the hollow fine particles of the present invention are used for heat insulation, those having an average particle diameter of 5 to 100 μm and a minimum particle diameter of 1 μm or more to a maximum particle diameter of 50 μm or less are preferable.

When the granular material (hollow fine particles) of the present invention is used for sound insulation, it is preferable that the average particle diameter is in the range of 5 to 100 μm and the particle diameter is 1 to 250 μm. As shown in Example 1 described later, since the samples A1 to A6 have an average particle diameter of 5 to 100 μm and a particle diameter of 1 to 250 μm, all have good sound insulation. The sample using the sample A4 having a maximum particle diameter of 212 μm has the lowest external sound pressure and excellent sound insulation. Therefore, when the hollow fine particles of the present invention are used for sound insulation, those having an average particle diameter of 5 to 100 μm and a minimum particle diameter of 1 μm or more to a maximum particle diameter of 200 μm or less are preferable. Desirably, those having a wide particle size distribution within the above range are preferable because they can absorb sound in a wider range of frequencies.

Since the granule of the present invention is a fine particle having a hollow inside, it is difficult for heat to be transferred to the inside of the particle and has high heat insulating properties, and it is difficult for sound to be transmitted to the inside of the particle, and thus has high sound insulation. The volume of the hollow fine particles is preferably in the range of 0.16 to 0.35 g / cm ³ . If the weight exceeds 0.35 g / cm ³ , the proportion of the internal space is small and the heat insulating effect is small. On the other hand, when the weight is smaller than 0.16 g / cm ³ , the strength is lowered because the film thickness of the particles is thin.

The granular material of the present invention is used by mixing with a paint. The amount of the granular material to be mixed with the paint is not limited, but in general, the content of the granular material in the paint is preferably 5% by mass or more because the function is sufficiently expressed. Specifically, the content of the granular material is preferably 5 to 50% by mass in the heat insulating coating, and the content of the granular material is preferably 10 to 100% by mass in the sound insulating coating.

In the paint containing the granular material of the present invention, the components other than the granular material are preferably liquids, but are not limited to liquids as long as they do not impair the effects of the present invention. It can contain a sticking agent, a paste, a dispersant, a coloring pigment, other additives, and the like.

Specifically, as the solvent, for example, hydrocarbon compounds such as toluene, hexane, xylene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate and butyl acetate, alcohols such as ethanol, propanol, butanol and glycol, Ether-based and other aqueous solvents (including water) can be used. 10-80 mass% is suitable for the suitable usage-amount of the solvent in a coating material.

In addition, as resins, for example, synthetic resins such as alkyd resin, acrylic resin, epoxy resin, polyurethane resin, fluororesin, silicon resin, phenol resin, vinyl chloride resin, natural resins such as pine resin, agate, flaxseed oil, safflower oil, Oils such as soybean oil, castor oil, and rapeseed oil can be used. 10-60 mass% is suitable for the suitable usage-amount of resin in a coating material.

Moreover, as a thickener, for example, a cellulose derivative, and as a paste, for example, starch or vinyl acetate can be used. 0.1-10 mass% is suitable for the suitable usage-amount of the thickener and paste in a coating material.

Further, as the dispersant, for example, a polycarboxylic acid polymer, lignin sulfonic acid, naphthalene sulfonic acid formalin condensate or the like can be used, and those having a graft polymer structure are particularly suitable. A suitable amount of the dispersant used in the paint is suitably 0.05 to 5% by mass.

In addition, for example, pigments such as titanium dioxide, zinc white, lead white, zinc yellow, carbon black, permanent red, red pepper, yellow lead, cyanine blue, bitumen, ultramarine blue, cyanine green, and iron oxide can be used as the color pigment. A suitable amount of the color pigment used in the paint is 1 to 20% by mass.

Further, as other additives, plasticizers, curing agents, pigment dispersants, emulsifiers, drying agents, antifoaming agents, antiseptics, rust inhibitors, antifreezing agents, antifungal agents, water repellents, etc. may be used. In any case, an appropriate amount can be contained in the paint and used. The heat insulating paint or sound insulating paint of the present invention obtained by mixing these components can be used for any material such as metal, ceramics, wood, resin, etc., and the application method is also particularly limited. For example, a brush, a roller, a brush, a scissors, a spray device, etc. can be used, Furthermore, it can be used also for the method by electrostatic coating, curtain coating, etc.

Hereinafter, the present invention will be specifically described by way of examples. In addition, the average particle diameter, the floating rate, the volume, the water absorption rate, the hydrostatic pressure levitation remaining rate, the partition wall ratio, the smoothness, the heat insulating property, and the sound insulating property were measured by the following methods.

[Average particle size]
Using a laser diffraction particle size distribution measuring device, measurement was performed with a measuring instrument (Microtrack) manufactured by Nikkiso Co., Ltd.
[Ratio of partition wall particles]
A sample dispersed with alcohol is dropped on the preparation, and the sample is uniformly dried. This was observed with a transmission microscope, and the number of 100 partitions was counted.

[Weight]
A sample is filled into a container with a constant volume S (cm ³ ), the portion protruding from the opening is ground, the total weight G1 is measured, and the weight G2 of the container is subtracted from this to obtain the powder weight G3 (g). The ratio of the powder weight G3 to the volume S [G3 / S] g / cm ³ was defined as the volume.

[Floating rate]
The float ratio is the volume ratio of the particles floating on the water surface to the total sample particles when the sample particles are immersed in water, and is the float ratio under pressure and normal pressure. About 10 g of sample is put in a 200 ml graduated cylinder, soaked in water, allowed to stand after sufficiently stirring, placed until there is no turbidity in water, the volume Vb of the floated sample Va and the sinked sample is measured, Va / ( The floating rate was calculated based on the formula of Va + Vb) × 100.

[Water absorption rate]
About 200 g sample is put in a sufficient amount of water and left for 24 hours. This is naturally filtered with 5 types A filter paper. This is thinly and evenly spread on a watch glass, air-dried, a sample is taken, and the water absorption sample mass ma is measured. This is dried to a constant weight with a dryer at 105 ° C., and the dry sample mass mb is measured. The water absorption was calculated from the formula (ma-mb) / mb × 100.

[Remaining hydrostatic pressure levitation rate]
The sample is put into a pressurized container filled with water together with the sample container, and pressurized at 8 MPa for 1 minute. After pressurization, the entire amount of the pressurized sample is taken out and placed in a graduated cylinder, and 200 ml of water is added and left to stand. When the turbidity of water disappears after standing, the volume of the sample particles floating is measured by a method according to the above method for measuring the floating rate, and is set as a pressurized floating rate (floating rate) W2 under a pressure of 8 MPa. A sample having the same amount as the pressurized sample is measured by the same measurement method except that the sample is not pressurized and is at normal pressure, and is defined as a non-pressurized floating rate (floating rate) W1. The hydrostatic pressure levitation residual rate was calculated based on the formula of pressurized sample buoyancy rate W2 / non-pressurized levitation rate W1 × 100.

[Sample preparation method for smoothness, heat insulation, sound insulation test]
30 parts by mass of the granule was added to 100 parts by mass of a commercially available water-based paint (product name “aqueous supercoat white”, manufactured by Asahi Pen Co., Ltd.), and mixed with a hand mixer to prepare a test paint. Each test paint was applied to one side of a steel flat plate 30 cm long, 30 cm wide and 3 mm thick with a brush so that the film thickness would be about 300 μm, and dried in air at room temperature to form a coating film. . About this coating film, the smoothness and heat insulation of the coating-film surface were measured.

[Smoothness]
The surface of the coating film was touched by hand and evaluated in the following three stages.
×: Rough, Δ: Relatively smooth, ○: Smooth.
〔Thermal insulation properties〕
A 500 W photographic reflex lamp was irradiated on the flat plate coating surface from a height of 30 cm for 5 minutes, and the temperature of the back surface was measured by a temperature sensor. With this value, the heat insulation was evaluated in the following three stages.
X: 71 ° C. or higher, Δ: 70 to 66 ° C., ○: 65 ° C. or lower.

[Sound insulation]
The test paint was applied to the entire inner surface of a cube-shaped plastic box (thickness 2 mm) of about 30 cm opened on only one side, and a small speaker (diameter 5 cm, output 1.5 W) was installed inside. The opening was completely sealed with the same material as the box, and in that state, 75 dB of white noise was generated at room temperature, and the sound pressure at a location 10 cm away from the box was measured with a handy digital sound level meter. The sound insulation was evaluated in the following three stages according to the value of the measured sound pressure.
×: 66 dB or more, Δ: 65 to 61 dB, ○: 60 dB or less

[Example 1]
Pearlite [chemical content (mass%) SiO ₂ 74%, Al ₂ O ₃ 13%, Fe ₂ O ₃ 1%, CaO 1%, MgO 0.1%, Na ₂ O 3.5%, K ₂ O 4.4%, ig .loss 2.2%] to produce siliceous hollow fine particles, and those having a volume of 0.15 to 0.35 g / cm ³ and an average particle size of 10 to 100 μm were selected (product of the present invention: No. A1 to A6). ). For any of the samples A1 to A6, the sample remaining on the sieve having a sieve size of 1 μm is used, and the A1 sample is a sieve having a sieve size of 300 μm, the A2 sample is having a sieve size of 45 μm, and the A3 sample is sieved. A sieve having a mesh size of 106 μm, a sample of A4 having a sieve size of 212 μm, a sample of A5 having a sieve size of 45 μm, and a sample of A6 having a sieve having a size of 106 μm were used. For these hollow fine particles, the volume, average particle size, ratio of partition wall particles, hydrostatic pressure levitation residual rate, water floating rate, water absorption rate are measured, and further mixed with the paint to measure its smoothness, heat insulation, and sound insulation. did. These results are shown in Table 1.

[Comparative Example 1]
Samples in which hollow particles having partition walls are produced in the same manner as in Examples, the average particle diameter is out of the range of the present invention, and the weight and the hydrostatic levitation residual ratio are out of the preferable range of the present invention (No. B1 to B5) Selected. B1 has an average particle size of 195 μm, B3 has an average particle size of 3 μm, and B4 has an average particle size of 305 μm, both of which fall outside the scope of the present invention. Further, B2 has a hydrostatic levitation residual ratio of 31% and B5 has a capacity of 0.40 g / cm ³ , both of which are outside the preferred range of the present invention. For these hollow fine particles, the volume, average particle size, ratio of partition wall particles, hydrostatic pressure levitation residual rate, water floating rate, water absorption rate are measured, and further mixed with the paint to measure its smoothness, heat insulation, and sound insulation. did. These results are shown in Table 2.

[Comparative Example 2]
A commercially available pearlite (pearlite-based heated foamed particle) having a weight of 0.21 g / cm ³ and an average particle size of about 96 to 210 μm was used as a sample (No. C1 to C2). In addition, organic hollow fine particles (trade name “Matsumoto Microsphere”, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) were used (NoC3). Furthermore, commercially available pearlite hollow fine particles were reheated to 1000 ° C. in a rotary electric furnace, and the surface was melted to produce a product in which internal bubbles communicated (No. C4). About these hollow fine particles, the volume, the average particle diameter, the state of bubbles, the hydrostatic levitation residual rate, the water floating rate, the water absorption rate were measured, and further mixed with the paint to measure its smoothness, heat insulating properties, and sound insulation properties. . These results are shown in Table 3.

[Comparison criteria]
Smoothness, heat insulation, and sound insulation were measured for a commercially available water-based paint (product name “water-based supercoat white”, manufactured by Asahi Pen Co., Ltd.) that does not mix the particulate material. This is shown in Table 4 as a comparison standard.

As shown in Table 1, all of the hollow fine particles (No. A1 to A6) having a partition wall in the internal space and having an average particle size of 25 to 100 μm and a weight of 0.16 to 0.35 g / cm ³ are hydrostatically levitated. The residual rate is 60% or more, and a high levitation rate is exhibited even under pressure. On the other hand, as shown in Table 3, all of the conventional pearlite commercial products have a hydrostatic levitation residual ratio of 55% or less (No. C1, C2), and the hollow fine particles of the present invention have the same particle size as the conventional ones. The hydrostatic levitation rate is higher than that of pearlite. This indicates that conventional perlate easily permeates water inside the particles under pressure.

Moreover, as shown in Table 1, a coating having good smoothness can be obtained by using particles having an average particle size of 100 μm or less. On the other hand, as shown in Table 2, when the average particle size exceeds 100 μm (No. B1, B4), the smoothness is lowered. Moreover, the smoothness of the pearlite commercial product is inferior to the product of the present invention (No. C1, C2). When the average particle size exceeds 100 μm, the particles are exposed from the surface of the paint, so that the smoothness is lowered.

As shown in Table 1, samples with an average particle size of 5 to 100 μm have a high heat insulation effect (No. A1 to A6), and samples with a maximum particle size of 50 μm or less (No. A2) have the smallest rising temperature, especially the heat insulation effect. Is expensive. When the average particle size is smaller than 5 μm, the heat insulating effect is low (No. B3). This indicates that there is not enough space for insulation.

Moreover, as shown in Table 2, even when the volume and particle size are similar, those having a partition wall ratio of 60% or less have a low hydrostatic levitation residual rate and low heat insulation (No. B2, B3). This indicates that when mixing the particulate material of the hollow fine particles with the paint, the particulate material is easily damaged, and the heat insulation effect is lowered because the hollow cannot be maintained.

Moreover, as shown in Table 3, even if the weight and particle size are comparable, if the water absorption rate is high, the heat insulating property decreases (No. C1, C2). This indicates that when the hollow fine particles are mixed with the paint, the solvent and the paint components easily permeate into the granules, so that the internal cavities cannot be maintained and the heat insulation effect is reduced. Furthermore, even if the water floating rate and strength are large and the water absorption rate is small, if the weight is high, the heat insulating property is lowered (No. B5). This is because the hollow particles are hardly damaged at the time of mixing with the paint, but since the hollow volume inside the particles is small, heat is easily conducted and it is difficult to obtain a heat insulating effect.

Furthermore, as shown in Table 3, the sample (No. C4) in which the particle surface is remelted to close the surface opening also has a low heat insulating effect. This is because if the particle surface is partially damaged, the paint component enters the inside of the particles through the communicating bubbles, and it is difficult to obtain a heat insulating effect.

As shown in Table 1, the sound insulation effect is high when the average particle size is 5 to 100 μm (No. A1 to A6), and the sample (No. A4) containing hollow fine particles having a maximum particle size of 250 μm or less has particularly high sound insulation effect. . When the average particle size is smaller than 5 μm, the sound insulation effect is low (No. B3). This indicates that the space necessary for sound insulation is not sufficient.

Further, as shown in Table 2, even when the weight and particle size are similar, those having a partition wall ratio of 60% or less have a low hydrostatic levitation residual rate and low sound insulation (No. B2, B3). This indicates that when mixing the particles of hollow fine particles with the coating material, the particles are easily damaged, and the sound insulation effect is reduced because the hollow cannot be maintained.

Further, as shown in Table 3, even if the volume and particle size are comparable, the sound insulation performance decreases when the water absorption rate is high (No. C1, C2). This indicates that when hollow particulate material is mixed with a coating material, the solvent and the coating component easily penetrate into the interior of the particulate material, so that the internal cavity cannot be maintained and the sound insulation effect is reduced. Furthermore, even if the water floating rate and strength are large and the water absorption rate is small, if the weight is high, the heat insulating property is lowered (No. B5). This is because when hollow particles are mixed with a coating material, the hollow particles are hardly damaged, but the volume of the cavity inside the particles is small, so that it is difficult to absorb the vibration of sound and the sound insulation is reduced.

Furthermore, as shown in Table 3, the sample (No. C4) in which the surface of the particle is remelted to close the surface opening also has a low sound insulation effect. This is because if the particle surface is partially damaged, the paint component enters the particle through the communicating bubbles, and it is difficult to obtain a sound insulation effect.

[Example 2]
Using the hollow fine particles (No. A3) of Example 1, various commercially available paints ("for oily tones" (D1), "for aqueous tones" (D2), "for high-grade acrylic tones" (D3), all white, 30 parts by mass of the hollow fine particles (No. A3) were added to 100 parts by mass of all Asahi Pen company products) and mixed with a hand mixer to prepare test paints (No. D1 to D4). Each test paint was applied to tin-colored tin (1 m × 1 m), applied without any spots so as to be about 300 μm, and dried in the air at room temperature to form a coating film. This was installed outdoors exposed to direct sunlight, exposed for 30 days, and then observed for deterioration. In addition, a temperature of about 1 cm was measured under tin during the day. The outside temperature at this time was 29 degreeC. These results are shown in Table 5. In any of the paints (No. D1 to D4), an effect of heat insulation was obtained as compared with the paint without adding the particulate material.

Example 3
In the same manner as in Example 1, the smoothness, heat insulating properties, and sound insulating properties were measured by changing the thickness of the coating material and the amount of granules added. A3 of Example 1 was used for the granule, and the amount of the granule was added in an amount of 5 to 100 parts by mass (E1 to E3) with respect to 100 parts by mass of the coating material. The film thickness was 20 to 500 μm (E4 to E6). These results are shown in Table 6.

When the added amount of the granule is 5 parts by mass, the heat insulation and sound insulation are low, and when it exceeds 100 parts by mass, the surface smoothness is somewhat impaired. Further, when the coating thickness is 20 μm, the heat insulating properties and sound insulating properties are insufficient. On the other hand, when the film thickness exceeds 500 μm, smoothness, heat insulation and sound insulation are all good, but economically inferior.

Example 4
A heat-resistant paint was prepared using the hollow fine particles (No. A3) of Example 1 and commercially available organic hollow fine particles (No. C3), and a heat resistance test was conducted. The paint was prepared by using thinner as a solvent and mixing a silicon resin, a pigment (titanium powder), and hollow fine particles (content of hollow fine particles 30% by mass). This paint was applied to a 30 cm square iron plate and sufficiently dried, then placed in an electric furnace and heated at the temperature shown in the table for 24 hours, and then the surface was observed. The results are shown in Table 7.

As shown in Table 7, the organic hollow fine particles (No. C3) were deformed by heat, and the paint began to crack at 200 ° C., but the fire-resistant paint using the product of the present invention (No. A3) was 400. It did not change even at high temperatures of ℃.

Claims (9)

A granule for paint, which is a siliceous hollow fine particle blended in a paint, has an average particle diameter of 5 to 100 μm, and is formed by a plurality of closed cells in which an internal space is partitioned by a partition wall. The granule for paint according to claim 1, wherein the residual rate of levitation at 8 MPa hydrostatic pressure is 50% or more and the water absorption is 3% or less. The granule for paint according to claim 1 or _{2, wherein the} chemical component has a SiO2 content of 65 to 90 mass%. The granule for paint according to claim 1, wherein the weight is 0.16 to 0.35 g / cm ³ . The granule for coating materials according to any one of claims 1 to 4, comprising 60 or more of 100 particles having an internal space formed by a plurality of closed cells separated by partition walls. The granule for paint according to any one of claims 1 to 5, wherein the granule for heat-insulating paint comprises a granule for paint having a particle diameter of 1 to 50 µm. A granule for sound insulation paint according to any one of claims 1 to 5, wherein the granule for sound insulation paint comprises a granule for paint having a particle diameter of 1 to 250 µm. A heat insulating paint comprising the granule for heat insulating paint according to claim 6. A sound insulating paint comprising the particulate material for sound insulating paint according to claim 7.