JPS6117783B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a flame-retardant sound absorbing material in which inorganic solid particles are bonded with an organic binder. Conventionally, fibrous sound-absorbing materials in which glass fibers are bonded with phenol or the like are often used as sound-absorbing materials. However, these fibrous sound-absorbing materials easily absorb moisture and release the absorbed moisture very slowly, so the sound-absorbing properties deteriorate significantly due to water absorption, and it takes a long time for the sound-absorbing properties to recover. In addition, since it is fibrous, in order to maintain the shape of the sound-absorbing material and to prevent the fibrous material from scattering, various sound-absorbing methods are used, such as placing it in a metal frame and placing punching metal etc. on the surface. Fibrous sound-absorbing materials have many problems and drawbacks, such as the need to take measures to protect the material and the workability of the material when made into panels is extremely poor. Also, so-called ceramic sound absorbing materials are widely known, which are made by firing and bonding inorganic solid particles such as silica sand or crushed ceramics with a glass-based binder.
This material has many disadvantages, such as high firing cost, and since it is a fired product, it is difficult to produce large-sized sound absorbing materials, it is extremely difficult to process such as cutting, and the sound absorbing material is heavy. It was something I had. Furthermore, various sound absorbing materials have been proposed in which lightweight aggregates such as perlite, hollow balloons, and pumice, and inorganic solid particles such as silica sand and crushed ceramics are combined using organic binders or inorganic solid particles, either singly or in combination. However, sound absorbing materials using inorganic binders such as silicates, phosphates, cement, and gypsum have low adhesive strength, so a large amount of binder must be used to obtain the desired strength. For this reason, the gaps between the aggregates required for sound absorption are filled with sound absorbing materials, resulting in poor sound absorbing properties and heavy weight. The material had drawbacks such as poor water resistance, low freeze resistance, and poor workability. In addition, sound absorbing materials using organic binders are flammable and are unfavorable from a disaster prevention standpoint, especially when used indoors. The high-strength flame-retardant sound-absorbing material of the present invention was developed to solve these drawbacks of conventional sound-absorbing materials, and is made by combining inorganic solid particles with an organic binder in the presence of a flame retardant. It is a porous sound absorbing material with inorganic particles bound together, with a bulk specific gravity of 0.1 to 1.5 and an average particle size.
A mixing ratio of 0.2 to 5 mm inorganic solid particles, 1 to 10 parts by volume of an organic binder for the inorganic solid particles, and 30 to 80 parts by weight of aluminum hydroxide and antimony trioxide/paraffin chloride to the organic binder. but
The present invention is a high-strength flame-retardant sound-absorbing material comprising at least a mixture of antimony trioxide and paraffin chloride in an amount of 0.2 to 1.5 parts by weight, and glass fiber. That is, the present invention provides at least a method comprising at least inorganic solid particles having a specific particle size and bulk specific gravity, a specific amount of an organic binder, a specific type and amount of a flame retardant, and glass fiber as a reinforcing material. Due to the synergistic effect, a sound absorbing material with excellent flame retardancy, sound absorption properties, water repellency, bending strength, workability, etc. was obtained. To further explain the present invention in detail, 1 to 10 parts by volume of inorganic solid particles such as silica sand, perlite, pumice, hollow balloons, lightweight aggregates, metal granules, ceramics, refractories, pulverized materials such as tiles, etc. of an organic binder, preferably unsaturated polyester resins or phenolic resins, and 30% of the organic binder.
A mixture of ~80 parts by weight of aluminum hydroxide, which lowers the combustion temperature by releasing moisture at high temperatures, and antimony trioxide, which has a coating effect when used in combination with chlorinated paraffin, which generates inert gas at high temperatures. 5 to 30 parts by weight of the mixture to the organic binder, the mixing ratio of which is within the range of 0.2 to 1.5, and at least glass fiber for reinforcing glass single fibers, rovings, glass cloth, etc. More preferably, in order to further enhance the flame retardancy of the sound absorbing material, at least one of ammonium bromide, ammonium phosphate, and guanidine phosphate is added in an amount of 1 to 15% by weight based on the organic binder. This includes: These sound absorbing materials are formed into a plate-like body with a porosity of 30 to 50% and a maximum pore diameter of 4 mm or less, and the thickness of the sound absorbing material is surrounded by a frame made of metal or plastic. It is more preferable that the Next, a method for manufacturing the flame-retardant sound-absorbing material of the present invention will be described. 1 to 10 parts by volume of unsaturated polyester resins and phenolic resins per 100 parts of the above-mentioned inorganic solid particles having a bulk specific gravity of 0.1 to 1.5 and an average particle size of 0.2 to 5 mm, or a mixture thereof. , an organic binder such as epoxy resins is added, and the mixture ratio is equivalent to 30 to 80 parts by weight of aluminum hydroxide and 5 to 30 parts by weight to the binder. (Antimony trioxide/paraffin chloride) = A mixture of antimony trioxide and paraffin chloride mixed within the range of 0.2 to 1.5, and if necessary, 1 to 15 parts by weight of ammonium bromide and phosphorus to the binder. about 3 to 25 parts by weight of ammonium acid, guanisine phosphate, or a mixture thereof and optionally 5 to 50 parts by weight based on the binder;
Glass single woven fibers of approximately 1.0 mm in diameter are added and thoroughly kneaded to form a binder coating on the surface of the inorganic solid particles. At this time, when kneading the inorganic solid particles and the binder, curing accelerators, ultraviolet absorbers,
Of course, fillers, pigments, etc. may also be added. Next, a frame body, preferably made of metal or plastic, is placed around the inner surface of a mold of a predetermined size, and if necessary, a glass cloth cut to a predetermined size is placed inside the mold, and the kneaded material is is put into the frame to make it uniform, and after molding by vibration compression molding or the like, the binder is cured to produce a porous, high-strength, flame-retardant, sound-absorbing material that is integrally bonded to the frame. In addition, the porosity, maximum pore diameter, bulk specific gravity of the sound absorbing material, etc. can be adjusted to the predetermined optimal values by adjusting the excitation force, excitation time, pressing force, particle size distribution of the lubricant, and amount of binder. Although it is easy to manufacture, a sound absorbing material with the best sound absorbing properties can be obtained by adjusting the porosity to 30 to 50% and the maximum pore diameter to 4 mm or less. Note that the frame surrounding the sound absorbing material in the thickness direction may, of course, be provided so as to surround the sound absorbing material after it has been molded and cured, instead of being placed in the mold. Also, the glass fibers can be either short fibers or cloth, but either type of fiber is required for reinforcement, and even if the fibers are exposed on the surface, they cannot be buried inside. Either is fine. Next, the reasons for the limitations of the present invention will be described. The reason why the bulk specific gravity of inorganic solid particles is limited to 0.1 to 1.5 is because if the bulk specific gravity is less than 0.1, regardless of whether the pores present in the solid particles are open or closed. , the air present in the pores greatly contributes to combustion, and good flame retardancy cannot be obtained even with the effects of the various flame retardants and reinforcing materials in the present invention, and furthermore, the bulk specific gravity is 0.1 Generally, the solid particle strength is weak, and it is difficult to knead,
This is because they are easily damaged during the molding process, and if the bulk specific gravity exceeds 1.5, the weight of the sound absorbing material becomes heavy.Also, solid particles with bulk specific gravity exceeding 1.5 are generally hard, and the inorganic solid particles This is because the processing methods such as cutting and drilling are inferior to sound absorbing materials using . In addition, the average particle size of inorganic solid particles is 0.2 to 5 mm.
The reason for this limitation is that in sound absorbing materials using particles with an average particle size of less than 0.2 mm, the diameter of the pores that penetrate the front and back of the molded plate becomes small, and the amount of water absorbed is large due to capillary phenomenon.
In addition, water absorption and drainage become worse, resulting in a significant decline in sound absorption properties during rainfall and a significant delay in recovery.
Furthermore, this is because the peak value of the sound absorption properties is significantly reduced. In addition, when the average particle size exceeds 5 mm, the diameter of the pores penetrating the front and back sides of the adsorbent becomes large, making it easier for flames to penetrate when exposed to high temperatures, and making it easier to supply air that contributes to combustion. decomposition gas is easily released due to combustion, and the flame retardance is significantly reduced.
Furthermore, as the diameter of the slit becomes larger, the peak property of the sound absorption property becomes stronger, making it impossible to obtain good sound absorption property. Next, the content of the organic binder was limited to 1 to 10 parts by volume based on the inorganic solid particles because if it is less than 1 part, the amount of the organic binder is too small and the mechanical strength is insufficient. This is because if the amount exceeds 10 parts, the binder fills the voids between particles, resulting in a decrease in porosity and a decrease in sound absorption properties. Next, the content of aluminum hydroxide was limited to 30 to 80 parts by weight based on the binder because if it is less than 30 parts by weight, less moisture will be generated at high temperatures, and flame retardation will be insufficient. This is because if it exceeds 80 parts by weight, cracks and blisters will occur at high temperatures. Next, the mixing ratio of antimony trioxide and chlorinated paraffin is determined as antimony trioxide/chlorinated paraffin =
0.2 to 1.5, and the content of the mixture was limited to 5 to 30 parts by weight based on the organic binder, as shown in FIG. If the content of the mixture is less than 5 parts by weight based on the binder, the exhaust temperature time area increases and the afterflame time becomes longer. This is because if the amount exceeds 30 parts by weight, the amount of smoke generated increases, and in either case, the flame retardant effect decreases. Next, examples of the present invention will be described. To inorganic solid particles having the bulk specific gravity and average particle size shown in Table 1, thermosetting unsaturated polyester resin in the proportion shown in Table 1 is added, and aluminum hydroxide in the amount shown in Table 1 is added. A mixture of equal weights of antimony trioxide and paraffin chloride (mixing ratio 1) and glass fiber were added, and ammonium bromide,
Ammonium phosphate, guanidine phosphate, or a mixture thereof was added and kneaded using a kneader to obtain a kneaded product-A.

【table】

[Table] Next, a frame with a wall thickness of 2 mm was installed around the inside of a mold with internal dimensions of 100 cm x 50 cm x 2 cm, which was coated with a mold release agent and lined with glass paper and glass cloth. A predetermined amount of the material was put into the frame and leveled out evenly, then glass paper and glass cloth were laid down and the upper mold was placed on top. Next, the mold was vibrated under pressure and then heated in a hot press kept at 130°C for 10 minutes to obtain products No. 1 to No. 23 of the present invention. In addition, as a reference product, we have prepared a product that is outside the numerically limited range of the product of the present invention.
No. 24 to No. 33. In addition, as conventional products, we also prepared a glass wool-based fibrous sound absorbing material (No. 34) and a so-called ceramic sound absorbing material (No. 35), which is made by firing and bonding inorganic particles with glaze. In addition to measuring the porosity and maximum pore diameter of these sound-absorbing materials, we also conducted tests based on the flame retardant test method specified in JIS-A-1321 to determine the time-temperature area and smoke generation exceeding the standard temperature curve. The coefficient and afterflame time were measured and the results are listed in Table 2.

【table】

[Table] In addition, the sound absorption properties were measured in accordance with JTS-A-1405 "Method for measuring the normal incidence sound absorption coefficient of building materials using the in-pipe method" with a back air layer of 60 mm. After soaking in water for an hour, the temperature is 20
Measurements were performed by leaving the sample in a constant temperature and humidity chamber maintained at ℃ and humidity of 60%. In addition, test pieces were cut out from the sound-absorbing plate using a cutter, and the bending strength was measured, as well as the mechanical workability was comparatively measured, and the results are listed in Tables 1 and 2. In addition, the product of the present invention
No.1 and No.20, reference products No.24, No.25 and conventional products
The sound absorption characteristics of No. 35 are shown in Figure 2. As described above, the high-strength flame-retardant sound-absorbing material of the present invention comprises inorganic solid particles with a specific bulk specific gravity and average particle size, a specific amount of an organic binder, a specific type and amount of a flame retardant, and reinforcement. Due to the synergistic effect in combination with glass fiber, flame retardancy, sound absorption properties, water repellency,
This is the first sound-absorbing material that has excellent bending strength and workability, and can be used as sound-absorbing materials for various noise pollution prevention applications, such as sound-absorbing materials for sound-proof walls, sound-absorbing interior materials, and under-floor sound-absorbing materials. Above all, it is extremely useful.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the relationship between the mixing ratio of antimony trioxide and chlorinated paraffin and flame retardancy.
FIG. 2 is an explanatory diagram showing a comparison of sound absorption characteristics between the product of the present invention, reference products, and conventional products.

Claims (1)

[Claims] 1. Inorganic solid particles with a bulk specific gravity of 0.1 to 1.5 and an average particle size of 0.2 to 5 mm, and 30 to 80 parts by weight of aluminum hydroxide and antimony trioxide per 1 to 10 parts by volume of an organic binder of the inorganic solid particles. A high-strength flame-retardant sound-absorbing material comprising at least 5 to 30 parts by weight of the above mixture with a mixing ratio of chlorinated paraffin of 0.2 to 1.5 and glass fibers.