Method for preparing foam glass with high sound absorption coefficient

Abstract

The invention relates to a preparation method of foam glass with high sound absorption performance, in particular to a method for preparing foam glass with high sound absorption coefficient by taking diatomite as a functional mixture. The preparation method comprises the following steps: (1) mixing crushed building waste glass or industrial waste glass, diatomite, a foaming agent and a foam stabilizer according to a weight ratio to form a batch; (2) putting the mixed batch into a ball mill for ball milling to obtain batch micro powder; (3) filling the ground micro powder of the batch into a mold, and carrying out compression molding; (4) putting the pressed green body into a furnace, and carrying out one-step firing foaming; and (5) annealing the fired foam glass, and demolding to obtain a finished product. The obtained foam glass is low in cost and high in sound absorption coefficient, is an ideal building sound absorption material and fireproof material, and has a heat insulation function; meanwhile, waste glass is used as a raw material, so that resource utilization of waste is realized.

Description

Technical Field

[0001] The invention relates to a method for preparing foam glass with a high sound absorption coefficient, in particular to a method for preparing foam glass with a high sound absorption coefficient by taking diatomite as a functional mixed material. Background Art

[0002] From the second industrial revolution to the present, the creation and application of various intelligent mechanical equipment has brought economic prosperity and progress to human society, but at the same time, it has also generated more and more noise. The existence of noise reduces the quality of our lives and work. In addition, long-term exposure to noise can cause damage to people's hearing. Continuous high noise levels can cause damage to the auditory nerve, leading to permanent hearing loss or hearing loss. This is particularly risky for occupational groups such as factory workers, construction workers, and airport ground staff. Therefore, the noise problem has always been an important issue of concern to people and an issue that relevant industry insiders are eager to solve.

[0003] There are countless tiny pores inside the foam glass, which makes it have sound absorption and noise reduction performance different from ordinary glass. Compared with other building materials, foam glass overcomes the various defects of organic and inorganic thermal insulation materials such as perlite, light calcium carbonate, foam plastics, cork, etc., and has great advantages in performance-price ratio. It has low density, high strength, and low thermal conductivity, so it integrates the functions of thermal insulation, heat insulation, sound absorption, moisture resistance, waterproofness, and fire resistance. It is particularly suitable for high-rise residential buildings, office buildings, exterior walls and interior walls of large factories, and is suitable for highway sound insulation tapes, industrial petrochemical pipelines, refrigeration, subways and underground engineering. Its sound absorption performance and other excellent building material properties make it a high-quality material for reducing noise pollution.

[0004] The sound absorption principle of foam glass is that there are many tiny gaps and connecting holes in the foam glass. When the sound wave enters the surface of the foam glass, the vibrating air will be subject to viscous resistance, and the sound wave will repeatedly rub against the surface of the hole wall, weakening the sound wave and achieving the sound absorption effect. Compared with existing sound-absorbing cotton, foam plastics, wooden boards, foam ceramics and other sound-absorbing materials, foam glass has less installation dust, longer service life, better chemical stability, and does not require high-temperature firing like foam ceramics. Therefore, it has great application potential in the field of architectural sound absorption. However, the preparation of foam glass with excellent sound absorption function often requires precise control of the pore structure, and the process difficulty and cost are relatively high. This also leads to the high price of high-quality sound-absorbing foam glass, which limits its large-scale promotion and application.

[0005] Diatomaceous earth is a biomass mineral formed by a series of geological processes such as sedimentation of dead diatoms. Its main component is SiO2. Its porous, strong adsorption and light weight make it sound-absorbing. However, its price is reasonable and it is an ideal raw material for manufacturing low-cost high-quality sound-absorbing materials. However, there is no relevant technical report on using diatomaceous earth to improve the sound absorption performance of foam glass.

[0006] The present invention makes full use of the porous structure and cost advantages of diatomite. The obtained foam glass has not only a higher sound absorption coefficient, but also good durability and stability, is not easily affected by the external environment, has a low density, and is easy to install. It can be used as a substitute for the above-mentioned sound-absorbing materials. Summary of the invention

[0007] In order to solve the current serious noise pollution problem, the purpose of the present invention is to provide a method for preparing foam glass with a high sound absorption coefficient at a low cost, making full use of the characteristics of diatomaceous earth such as good chemical affinity, high melting point, looseness and porosity, and low cost, so that micro-nanoscale channels can be constructed in the pore walls of the foam glass to form a complex multi-level pore structure, effectively improving the sound absorption performance of the foam glass, and at the same time realizing the recycling of waste glass resources, further reducing product costs.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions.

[0009] A method for preparing foam glass with a high sound absorption coefficient comprises the following steps:

[0010] (1) Mixing crushed and ground waste construction glass or industrial waste glass, diatomaceous earth (grade I), foaming agent and foam stabilizer in a certain weight ratio to form a batch material;

[0011] (2) placing the mixed ingredients into a ball mill for ball milling to obtain fine powder of the ingredients;

[0012] (3) putting the ground and mixed batch powder into a mold and pressing it into shape;

[0013] (4) placing the green body into a high temperature furnace and firing it in a "one-step method" under a certain firing process system;

[0014] (5) The fired foamed block is annealed, demoulded, and trimmed to obtain a finished product.

[0015] The mass fraction of the batch material is as follows: 70%-82% of waste glass powder, 12%-20% of diatomaceous earth powder (grade I), 1%-4% of foaming agent powder, and 4%-8% of foam stabilizer powder.

[0016] Furthermore, the waste glass in the batch material in step (1) is waste glass from buildings or waste scrap glass from industrial production.

[0017] Furthermore, in the batch material of step (1), the diatomaceous earth is high-quality diatomaceous earth (grade I) with a clay content of less than 10%, and the powder can pass through a 150-mesh sieve after grinding.

[0018] Furthermore, in the batch material in step (1), the foaming agent is at least one of carbon black, calcium carbonate and sodium carbonate, and the average particle size of the foaming agent powder does not exceed 25 μm.

[0019] Furthermore, in the batch material in step (1), the foam stabilizer is one or both of trisodium phosphate and potassium tripolyphosphate.

[0020] Furthermore, the fine powder of the batch material obtained by ball milling in step (2) can pass through a 300-mesh sieve.

[0021] Furthermore, in the step (4), when the green body is fired, the preferred temperature control system is: heating from room temperature to 850°C-920°C at a heating rate of 10°C-15°C / min, and keeping at this temperature for 90-150 minutes, and then cooling to 500°C-530°C for annealing and keeping for a suitable time;

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention uses high-quality diatomite as a functional mixed material to greatly improve the sound absorption performance of foam glass. The high melting point, looseness and porosity of diatomite ensure that it can be attached to the inside of the pores of foam glass to form complex multi-level interconnected pores, greatly improving the sound absorption coefficient of foam glass and enabling the product to obtain excellent sound absorption capabilities. At the same time, impurity components in diatomite ore, such as aluminum oxide, iron oxide and other components, can also be used as necessary flux raw materials for glass firing, making the best use of them.

[0024] (2) The present invention adopts a "one-step method" for firing, which has simple equipment and is convenient for industrial production. The prepared foam glass has the characteristics of low cost, low density, high strength, and low thermal conductivity. The product has the functions of heat preservation, heat insulation, sound absorption, moisture resistance, waterproofness, and fire prevention.

[0025] (3) The present invention utilizes construction waste glass and industrial waste glass to produce foam glass, which can realize the utilization of waste resources and significantly reduce the cost of raw materials. No harmful waste is discharged during the production process, which has important economic and ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The process flow chart of the present invention for preparing foam glass

[0027] Figure 2 This is a scanning electron microscope photo of diatomaceous earth raw materials.

[0028] Figure 3 This is a physical picture of the foam glass of Example 1 of the present invention DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific embodiments. The specific embodiments described here are only used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0030] like Figure 1 As shown, the process flow of preparing foam glass with high sound absorption coefficient provided by the present invention includes five processes: mixing, grinding, pressing, firing, and demoulding.

[0031] Example 1

[0032] A method for preparing foam glass with high sound absorption coefficient and the prepared foam glass

[0033] (1) Mixing: According to the raw material ratio, weigh the crushed waste glass, diatomaceous earth, carbon black and trisodium phosphate; the mass fractions are 70%, 20%, 2% and 8% respectively.

[0034] (2) Grinding: The weighed mixture is placed in a ball mill and ground for 3 h. The resulting mixture is sieved through a 300-mesh sieve.

[0035] (3) Pressing: The ground batch material is placed in a mold and pressed into a cylindrical sample with a radius of 40 mm and a height of 10 mm.

[0036] (4) Firing: The pressed green body is placed in a reaction furnace, and the temperature is raised from room temperature to 850°C at a heating rate of 10°C / min, and kept at this temperature for 150 minutes; then the temperature is lowered from 850°C to 500°C at a cooling rate of 10°C / min, and finally cooled to room temperature by furnace cooling to obtain foam glass.

[0037] (5) Demolding: The fired sample is annealed, demolded, and trimmed to obtain the finished product.

[0038] Example 2

[0039] A method for preparing foam glass with high sound absorption coefficient and the prepared foam glass

[0040] (1) Mixing: According to the raw material ratio, weigh the crushed waste glass, diatomaceous earth, carbon black and trisodium phosphate; the mass fractions are 80%, 15%, 1% and 4% respectively.

[0041] (2) Grinding: The weighed mixture is placed in a ball mill and ground for 3 h. The resulting mixture is passed through a 300-mesh sieve.

[0042] (3) Pressing: The ground batch material is placed in a mold and pressed into a cylindrical sample with a radius of 40 mm and a height of 10 mm.

[0043] (4) Firing: The pressed sample is placed in a reaction furnace, and the temperature is raised from room temperature to 870°C at a heating rate of 15°C / min, and kept at this temperature for 90 minutes; then the temperature is lowered from 870°C to 530°C at a cooling rate of 10°C / min, and finally cooled to room temperature by furnace cooling to obtain foam glass.

[0044] (5) Demolding: The fired sample is annealed, demolded, and trimmed to obtain the finished product.

[0045] Example 3

[0046] A method for preparing foam glass with high sound absorption coefficient and the prepared foam glass

[0047] (1) Mixing: According to the raw material ratio, weigh the crushed waste glass, diatomaceous earth, calcium carbonate and trisodium phosphate; the mass fractions are 74%, 18%, 4% and 4% respectively.

[0048] (2) Grinding: The weighed mixture is placed in a ball mill and ground for 3 h. The resulting mixture is passed through a 300-mesh sieve.

[0049] (3) Pressing: The ground batch material is placed in a mold and pressed into a cylindrical sample with a radius of 40 mm and a height of 10 mm.

[0050] (4) Firing: The pressed sample is placed in a reaction furnace, and the temperature is raised from room temperature to 880°C at a heating rate of 12°C / min, and kept at this temperature for 90 minutes; then the temperature is lowered from 880°C to 520°C at a cooling rate of 15°C / min, and finally cooled to room temperature by furnace cooling to obtain foam glass.

[0051] (5) Demolding: The fired sample is annealed, demolded, and trimmed to obtain the finished product.

[0052] Example 4

[0053] A method for preparing foam glass with high sound absorption coefficient and the prepared foam glass

[0054] (1) Mixing: According to the raw material ratio, weigh the crushed waste glass, diatomaceous earth, calcium carbonate and trisodium phosphate; the mass fractions are 82%, 12%, 1% and 5% respectively.

[0055] (2) Grinding: The weighed mixture is placed in a ball mill and ground for 3 h. The resulting mixture is passed through a 300-mesh sieve.

[0056] (3) Pressing: The ground batch material is placed in a mold and pressed into a cylindrical sample with a radius of 40 mm and a height of 10 mm.

[0057] (4) Firing: The pressed sample is placed in a reaction furnace, and the temperature is raised from room temperature to 920°C at a heating rate of 10°C / min, and kept at this temperature for 150 minutes; then the temperature is lowered from 920°C to 520°C at a cooling rate of 12°C / min, and finally cooled to room temperature by furnace cooling to obtain foam glass.

[0058] (5) Demolding: The fired sample is annealed, demolded, and trimmed to obtain the finished product.

[0059] Table 1 Bulk density, porosity and noise reduction coefficient of different embodiments

[0060] sample <![CDATA[Bulk density (g / cm 3 )]]> Porosity (%) Sound absorption coefficient Example 1 0.13 80.77 0.88 Example 2 0.15 81.65 0.85 Example 3 0.14 79.84 0.77 Example 4 0.16 80.58 0.82

[0061] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be modified in various ways, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A method for preparing foam glass with a high sound absorption coefficient, wherein the foam glass with a high sound absorption coefficient is obtained by the following steps: (1) crushing and grinding waste glass, diatomaceous earth powder, foaming agent powder, and foam stabilizer powder in a certain proportion to form a batch material, so that the weight percentage of each component satisfies 70%-82% of waste glass powder, 12%-20% of diatomaceous earth powder, 1%-4% of foaming agent powder, and 4%-8% of foam stabilizer powder; (2) placing the batch materials in a ball mill for ball milling and mixing to obtain batch material powder; (3) putting the batch powder into a mold and pressing it into shape; (4) placing the green body into a high temperature furnace and firing it in a "one-step method" under a certain firing process system; (5) The fired foamed block is annealed, demoulded, and trimmed to obtain a foamed glass product.

2. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: Among the raw materials in step (1), the waste glass is waste glass from buildings or leftover glass from industrial production.

3. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: Among the raw materials in step (1), the diatomaceous earth powder is grade I diatomaceous earth that is ground and can pass through a 150-mesh sieve.

4. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: In the raw materials of step (1), the foaming agent is at least one of carbon black, calcium carbonate and sodium carbonate.

5. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: In the raw materials of step (1), the average particle size of the foaming agent powder does not exceed 25 μm.

6. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: In the raw materials of step (1), the foam stabilizer is one or both of trisodium phosphate and potassium tripolyphosphate.

7. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: The fine powder of the batch obtained by ball milling in the step (2) can pass through a 300-mesh sieve.

8. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: The sintering system of step (4) is to increase the temperature from room temperature to 850°C-920°C, and keep it at this temperature for 90-150 minutes, and then cool it.

9. The method for preparing foam glass with high sound absorption coefficient according to claim 1, characterized in that: The annealing temperature of step (5) is 500°C-530°C.

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