CN116274293A - Recovery method of glass fiber composite material - Google Patents
Recovery method of glass fiber composite material Download PDFInfo
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- CN116274293A CN116274293A CN202310280201.0A CN202310280201A CN116274293A CN 116274293 A CN116274293 A CN 116274293A CN 202310280201 A CN202310280201 A CN 202310280201A CN 116274293 A CN116274293 A CN 116274293A
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- 238000011084 recovery Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 99
- 239000002699 waste material Substances 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 238000004064 recycling Methods 0.000 claims abstract description 17
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 39
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- 238000002485 combustion reaction Methods 0.000 claims description 7
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/50—Glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/75—Plastic waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/85—Paper; Wood; Fabrics, e.g. cloths
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention provides a glass fiber composite material recycling method, which comprises the following steps: step S1, cutting a composite material to be treated to a preset shape and a preset size, wherein the composite material to be treated is a waste glass fiber composite material; step S2, heating the composite material to be treated with the preset size at a first preset temperature in the atmosphere of protective gas so that the temperature of the composite material to be treated reaches the first preset temperature and is maintained for a first preset time, wherein the first preset temperature is 400-900 ℃, and the first preset time is 40-80 minutes; and step S3, cooling the composite material to be treated to obtain a renewable composite material. The glass fiber composite material recovery method can stably recover the glass fiber composite material and fully maintain the structure and mechanical strength of the glass fiber.
Description
Technical Field
The invention relates to the field of glass fiber composite material recovery, in particular to a glass fiber composite material recovery method.
Background
Glass fibers are formed from glass melt and contain silica, alumina, calcium oxide, boron oxide, and various minerals such as calcite, brushite and the like. The above compounds have different proportions in different types of glass fibers, so that the glass fibers have different properties, such as strength and weakness of alkali resistance, tensile strength, elongation at break and the like. Glass fiber products can be classified into chopped strands, direct drawn rovings, assembled rovings and mats, glass fiber composites, and the like, depending on the manner in which they are subsequently applied. Among them, glass fiber reinforced composite materials manufactured by vacuum injection molding, sheet molding, etc. are the most widely used products.
In recent years, the application range of glass fiber composite materials has been gradually expanded, and the use amount has been increased year by year. Compared with the conventional materials, the glass fiber composite material has the characteristics of light weight, high strength and corrosion resistance, and glass fiber composite materials are widely used for aerospace materials, vehicle structural members, decoration pieces, wind power blades, sports protection appliances and the like. After the design life has been reached, disassembly and disposal of the glass fiber composite has become a major challenge. At present, landfill, mechanical crushing, chemical dissolution, incineration and pyrolysis are the main modes applied to the treatment and disposal of waste glass fiber composite materials.
The landfill refers to simply mechanically cutting the waste glass fiber composite material after being disassembled, and then transporting the waste glass fiber composite material to a sanitary landfill site for household garbage or a nearby waste composite material landfill site for landfill. The method has the main advantages of relatively low cost, and besides the disassembling and transporting cost, only the construction and operation cost of the landfill is considered. The disadvantage is that the strength of the waste glass fiber composite is stronger than that of conventional solid waste contained in sanitary landfills, and the main components (glass fibers and thermosetting resin) are difficult to catabolize by the conventional microbial community. After the waste glass fiber composite material enters a landfill, the waste glass fiber composite material occupies landfill space for a long time and is difficult to decrement. Meanwhile, most of the stock capacity of the existing sanitary landfill sites in China is short, and the neighbor effect tends to be obvious due to further promotion of town, so that the site selection of the new landfill sites is more difficult. Furthermore, in view of recycling, the organic portion of the waste glass fiber composite has energy potential, and landfill is neglected and wasteful of the potential. Thus, landfills are viable as emergency means, but are not suitable as long term disposal means for waste glass fiber composites.
Mechanical crushing refers to further size reduction by a physical means after preliminary cutting of the waste glass fiber composite material, and the specific crushing degree depends on the subsequent recycling way, and can be matched with sorting equipment with density difference as a distinguishing way to realize rough separation of glass short fibers and organic parts. The mechanically broken waste glass fiber composite is often used as building materials or other composite aggregates, and the recycling potential of the waste glass fiber composite is not fully developed. In addition, the mechanical breaking can seriously damage the structure of the glass fiber, and a large amount of organic materials such as epoxy resin, phenolic resin and the like are still tightly combined on the short fiber, so that the glass fiber is difficult to truly separate. In the process of mechanical crushing, the powder of the glass fiber forms aerosol, which has serious threat to human health and surrounding ecological environment. Because the strength of the waste glass fiber composite material is high, the mechanical crushing energy consumption is high. Due to the above drawbacks, mechanical crushing is not suitable for large scale disposal of waste glass fiber composites.
A method of removing the organic portion of the waste glass fiber composite material with an acid, base or other organic solvent is called a chemical dissolution method. Several researchers have developed various solvents for specific glass fiber composites to specifically remove certain organic materials and achieve recovery. If the treated glass fiber composite material is of a fixed variety, the treatment by the chemical dissolution method is stable and efficient. However, glass fiber composite materials currently on the market are various in variety, and stable operation of a production line is difficult to realize. In addition, the glass fiber is chemically corroded when subjected to a partial treatment process, so that the original structure and strength of the glass fiber are lost. The large amount of volatile solvents also has strong human health and ecological risks. For the above reasons, chemical dissolution methods have not been widely popularized in China.
The incineration of the waste glass fiber composite material is a new mode formed along with the gradual expansion of the industrial scale of domestic garbage incineration in China, and mainly comprises mixed incineration and independent incineration of urban domestic garbage. The organic part in the waste glass fiber composite material can be converted into energy by incineration disposal, but the content difference of the organic part in the composite materials of different types is large, so that the material feeding amount is difficult to control, unbalanced and unstable incineration heat production is often caused, insufficient combustion is easily caused, and the emission of smoke pollutants exceeds the standard. In addition, in the incineration process, because of uneven temperature in the furnace, glass fibers are easy to melt and adhere to a hearth in a local high-temperature area, and a glass coating is formed after the furnace temperature is reduced, so that the thermal efficiency of the furnace body is reduced, and potential safety hazards are caused. Thus, to date, there have been difficulties in stable operation, whether by mixed incineration with household garbage or by incineration alone, and it has been difficult to use them as a main means for disposing of a large amount of waste glass fiber composite materials.
Disclosure of Invention
In view of the above problems of the prior art, an object of the present invention is to provide a glass fiber composite material recycling method capable of stably recycling a glass fiber composite material while sufficiently maintaining the structure and mechanical strength of glass fibers.
In order to solve the above problems, the present invention provides a glass fiber composite material recycling method, comprising:
step S1, cutting a composite material to be treated to a preset shape and a preset size, wherein the composite material to be treated is a waste glass fiber composite material;
step S2, heating the composite material to be treated with the preset size at a first preset temperature in the atmosphere of protective gas so that the temperature of the composite material to be treated reaches the first preset temperature and is maintained for a first preset time, wherein the first preset temperature is 400-900 ℃, and the first preset time is 40-80 minutes;
and step S3, cooling the composite material to be treated to obtain a renewable composite material.
Further, the predetermined shape includes a rectangular parallelepiped having a size of 4 to 15cm in length, 3 to 10cm in width, and 0.2 to 5cm in thickness.
Further, the step S2 includes:
s21, turning on a heating furnace, feeding the porcelain boat loaded with the composite material to be processed into the heating furnace, and turning off the heating furnace;
step S22, purging the heating furnace by using the protective gas so as to empty air in the heating furnace;
step S23, heating up at a preset heating rate through the heating furnace, and measuring the temperature of the shielding gas in the furnace so that the temperature of the shielding gas reaches the first preset temperature and is maintained for a first preset time.
Further, the predetermined temperature increase rate is obtained according to the following formula:
wherein ω is the rate of temperature rise, T 4 Is the reference temperature, T 2 Is a first predetermined temperature, is T 1 Heating the initial temperature T 3 Is the boiling point temperature of the composite material to be treated; v (V) 1 Is the volume within the furnace; v (V) 2 Is the volume of the composite material to be treated.
Further, the step S3 includes:
step S31, cooling the composite material to be treated for a second preset time by introducing gas with a second preset temperature and a cooling pipe of the heating furnace into the heating furnace;
and S32, turning on the heating furnace, and taking out the porcelain boat loaded with the composite material to be treated to obtain the renewable composite material.
Further, in the step S2 and the step S3, the gas in the heating furnace is collected, and the collected gas is cooled to obtain combustible substances, wherein the combustible substances are tar and non-condensable gas.
Further, the heating mode of the heating furnace in the step S2 includes heating by a combustion chamber, and supplying the combustible substance to the combustion chamber as fuel.
Further, the heating mode of the heating furnace further comprises heating by using a silicon carbide rod.
Further, the protective gas comprises nitrogen or argon, and the first preset temperature is 400-600 ℃.
Due to the technical scheme, the invention has the following beneficial effects:
according to the method for recycling the glass fiber composite material, disclosed by the embodiment of the invention, the organic part in the waste glass fiber composite material can be completely removed, the energy is realized, the generated tar and noncondensable gas can be used as energy substances to maintain the stable operation of the heat treatment process, and the structure and mechanical strength of the glass fiber can be fully reserved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the following description will make a brief introduction to the drawings used in the description of the embodiments or the prior art. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a method of recycling glass fiber composite according to one embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
Next, a method for recycling a glass fiber composite according to an embodiment of the present invention will be described.
As shown in fig. 1, the method for recycling glass fiber composite material according to the embodiment of the invention comprises the following steps:
and S1, cutting the composite material to be treated to a preset shape and size, wherein the composite material to be treated is a waste glass fiber composite material.
The waste glass fiber composite material can be broken down to a predetermined shape and size by mechanical processing.
Cutting the composite material to be treated to a predetermined shape and size can facilitate subsequent thermal decomposition and ensure the consistency of decomposition of the composite material to be treated.
And heating the composite material to be treated with the preset size at a first preset temperature in the atmosphere of protective gas so that the temperature of the composite material to be treated reaches the first preset temperature and is maintained for a first preset time, wherein the first preset temperature is 400-900 ℃, and the first preset time is 40-80 minutes.
Optionally, the shielding gas comprises nitrogen or argon.
Under the atmosphere of protective gas, impurities and water vapor in the external gas can be prevented from polluting the composite material to be treated in the heating process. The composite material to be treated can be gradually heated through the preset heating rate, so that gradual volatilization of organic matters of the composite material to be treated is facilitated.
Under the baking condition that the first preset temperature is 400-900 ℃ and the first preset time is 40-80 minutes, the organic part in the waste glass fiber composite material can be completely removed, the energy is realized, and the structure and the mechanical strength of the glass fiber can be fully maintained.
And step S3, cooling the composite material to be treated to obtain the renewable composite material.
In the time period, the glass fiber with the organic part removed can be used for further removing carbon residue and residual organic attachments.
According to the method for recycling the glass fiber composite material, the waste glass fiber composite material is broken and disassembled to be of a proper size in a mechanical treatment mode, a cut sample is sent into a pyrolysis device (a heating furnace), and the glass fiber composite material is subjected to heat treatment for 20-150 min in a protective gas-protecting atmosphere at the temperature of 400-900 ℃ to obtain solid pyrolysis residues.
The predetermined size of the present invention may be dependent on the size of the device.
The heat treatment temperature of the invention is 400-900 ℃, the treatment time is 20-150 min, the room temperature-500 ℃ is a heating stage, the 500-900 ℃ is a high temperature stage, and the 900-room temperature is a cooling stage. The high temperature section lasting time is 40-80 min, and the decomposition rate of 90-100% of the organic part of the glass fiber composite material can be realized. The higher the temperature, the shorter the high temperature segment duration can be.
The method can completely remove the organic part in the waste glass fiber composite material and realize energy, and the generated tar and noncondensable gas can be used as energy substances to maintain the stable operation of the heat treatment process. Meanwhile, the method can fully reserve the structure and mechanical strength of the glass fiber, and carry out subsequent recycling according to the size determined by the prior mechanical treatment.
In some embodiments of the invention, the predetermined shape comprises a cuboid having a dimension of 4-15 cm in length, 3-10 cm in width, and 0.2-5 cm in thickness.
The composite material to be recycled with the size is easier to decompose organic matters and fully comprises the structure and the mechanical strength of glass fibers.
In some embodiments of the present invention, step S2 includes: s21, turning on a heating furnace, feeding the porcelain boat loaded with the composite material to be treated into the heating furnace, and turning off the heating furnace; step S22, purging the heating furnace by using a protective gas to empty the air in the heating furnace; step S23, heating up at a preset heating rate through a heating furnace, and measuring the temperature of the shielding gas in the furnace so that the temperature of the shielding gas reaches a first preset temperature and is maintained for a first preset time.
The porcelain boat can hold the composite material to be recycled without precipitating impurities in high-temperature treatment.
The air in the heating furnace can be discharged by sweeping and evacuating the heating furnace by using the protective gas, so that impurities in the air are prevented from polluting the composite material to be treated.
Further, the predetermined temperature increase rate is obtained according to the following formula:
wherein ω is the rate of temperature rise, T 4 Is the reference temperature, T 2 Is a first predetermined temperature, is T 1 Heating the initial temperature T 3 Is the boiling point temperature of the composite material to be treated; v (V) 1 Is the volume in the heating furnace; v (V) 2 Is the volume of the composite material to be treated.
For example T 4 500 degrees, T 2 Is 600 degrees, T 1 Is 25 degrees, T 3 When the temperature was 1000 degrees, V1 was 1000 liters, and V2 was 100 liters, the temperature increase rate was 54.625 degrees per minute.
Based on the temperature rise from 25 ℃ at a constant speed for 10 minutes to 500 ℃, under the standard condition, the organic matters can be well decomposed, and the initial tensile strength and the initial elongation at break of the reserved glass fiber are optimal.
The preset heating rate fully considers the difference of the temperature of the first preset temperature from the boiling point, avoids the situation that the temperature is too fast to be heated, causes that the glass fiber cannot timely dissipate heat to the boiling point, causes the damage of the composite material to be treated, fully considers the heating space proportion, and needs to absorb a large amount of heat for the composite material to be treated, which occupies a large space in the furnace, and has slow heating rate.
Further, step S3 includes: step S31, cooling the composite material to be processed for a second preset time by introducing gas with a second preset temperature and a cooling pipe of the heating furnace into the heating furnace; and S32, turning on the heating furnace, and taking out the porcelain boat loaded with the composite material to be treated to obtain the renewable composite material.
The temperature of the gas with the second preset temperature can be consistent with the temperature to which the temperature needs to be reduced, so that accurate temperature reduction is realized. The cooling rate can be improved by cooling through the water cooling pipe.
The water cooling and the air cooling are synchronously carried out, so that the cooling rate is fast and accurate.
It should be noted that the foregoing is only an alternative example, and it is also possible to use only air cooling or water cooling, and it should be understood that the present invention is within the scope of the present invention.
According to some embodiments of the method, in step S2 and step S3, the gas in the heating furnace is collected and the collected gas is cooled to obtain combustible substances, wherein the combustible substances are tar and non-condensable gas.
The tar and non-condensable gases in the composite material to be treated heated by the heating furnace are collected in the heating and cooling processes so as to be reused.
Further, the heating mode of the heating furnace in step S2 includes heating by the combustion chamber, and supplying the combustible substance to the combustion chamber as fuel.
The combustible substances collected in the heating and cooling processes are used as heating energy sources, and the generated tar and noncondensable gas can be used as energy sources to maintain the stable operation of the heat treatment process. Thereby reducing the energy loss in the recovery process of the composite material to be treated.
Further, the heating mode of the heating furnace further comprises heating by using a silicon carbide rod.
This enables more efficient heating.
Example 1
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 400℃and maintained for 80min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 93.13% of the initial tensile strength of the glass fibers; 92.45% of the initial elongation at break was retained.
Example 2
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 500℃and maintained for 80min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The recycled glass fibers obtained in this example were tested to retain 97.29% of the initial tensile strength of the glass fibers; 96.95% of the initial elongation at break was retained.
Example 3
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 600℃and maintained for 80min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 98.29% of the initial tensile strength of the glass fibers; 97.95% of the initial elongation at break was retained.
Example 4
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 700℃and maintained for 60min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 90.92% of the initial tensile strength of the glass fibers; 88.46% of the initial elongation at break is retained.
Example 5
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 800℃and maintained for 60min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 83.36% of the initial tensile strength of the glass fibers; 80.34% of the initial elongation at break was retained.
Example 6
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 900℃and maintained for 60min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 79.23% of the initial tensile strength of the glass fibers; 72.41% of the initial elongation at break was retained.
Example 7
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 600℃and maintained for 40min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 98.45% of the initial tensile strength of the glass fibers; 93.21% of the initial elongation at break was retained.
Example 8
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 500℃and maintained for 40min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 97.31% of the initial tensile strength of the glass fibers; 89.73% of the initial elongation at break was retained.
Example 9
This example uses a tube furnace as the primary equipment to produce recycled glass fibers. The tube furnace uses silicon carbide rod as heating element to heat quartz and corundum tube. This example uses nitrogen to provide a protective atmosphere for the tube furnace.
(1) Cutting the waste glass fiber composite board sample into square blocks with the size of 4X 5cm, wherein the thickness of the cut sample is distributed between 0.5 cm and 2.0 cm.
(2) And placing the cut plate in a porcelain boat, pushing the plate to the center of a heating zone of a tube furnace, closing a furnace door and checking air tightness. The oven cavity was purged with nitrogen for 30min to ensure that the air was evacuated. The temperature in the furnace was raised from room temperature (25 ℃) to 400℃and maintained for 40min. And when the high-temperature period is over, turning off the nitrogen, replacing the nitrogen with an air pump, and introducing air into the furnace until the temperature is reduced to room temperature. At this time, a regenerated glass fiber can be obtained.
The regenerated glass fibers obtained in this example were tested to retain 93.65% of the initial tensile strength of the glass fibers; 86.71% of the initial elongation at break was retained.
As demonstrated by the above examples, the first predetermined temperatures of 400-900 degrees each retain a relatively high initial tensile strength and a relatively high initial elongation at break of the glass fibers. Wherein the first predetermined temperature is 400-600 degrees, and the retained glass fiber has higher initial tensile strength and retained initial elongation at break.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (9)
1. A method of recycling a glass fiber composite, comprising:
step S1, cutting a composite material to be treated to a preset shape and a preset size, wherein the composite material to be treated is a waste glass fiber composite material;
step S2, heating the composite material to be treated with the preset size at a first preset temperature in the atmosphere of protective gas so that the temperature of the composite material to be treated reaches the first preset temperature and is maintained for a first preset time, wherein the first preset temperature is 400-900 ℃, and the first preset time is 40-80 minutes;
and step S3, cooling the composite material to be treated to obtain a renewable composite material.
2. The method of claim 1, wherein the predetermined shape comprises a rectangular parallelepiped having a dimension of 4 to 15cm in length, 3 to 10cm in width, and 0.2 to 5cm in thickness.
3. The method for recycling glass fiber composite according to claim 1, wherein the step S2 comprises:
s21, turning on a heating furnace, feeding the porcelain boat loaded with the composite material to be processed into the heating furnace, and turning off the heating furnace;
step S22, purging the heating furnace by using the protective gas so as to empty air in the heating furnace;
step S23, heating up at a preset heating rate through the heating furnace, and measuring the temperature of the shielding gas in the furnace so that the temperature of the shielding gas reaches the first preset temperature and is maintained for a first preset time.
4. A method of recycling glass fiber composite according to claim 3, wherein the predetermined rate of temperature rise is obtained according to the following formula:
wherein ω is the rate of temperature rise, T 4 Is the reference temperature, T 2 Is a first predetermined temperature, is T 1 Heating the initial temperature T 3 Is to be at the siteThe boiling temperature of the composite material; v (V) 1 Is the volume within the furnace; v (V) 2 Is the volume of the composite material to be treated.
5. The method for recycling glass fiber composite according to claim 4, wherein the step S3 comprises:
step S31, cooling the composite material to be treated for a second preset time by introducing gas with a second preset temperature and a cooling pipe of the heating furnace into the heating furnace;
and S32, turning on the heating furnace, and taking out the porcelain boat loaded with the composite material to be treated to obtain the renewable composite material.
6. The method according to claim 1, wherein in the step S2 and the step S3, the gas in the heating furnace is collected and the collected gas is cooled to obtain combustible substances, the combustible substances being tar and non-condensable gas.
7. The method according to claim 6, wherein the heating means of the heating furnace in the step S2 includes heating by a combustion chamber, and supplying the combustible substance to the combustion chamber as fuel.
8. The method of claim 6, wherein the heating means of the heating furnace further comprises heating with a silicon carbide rod.
9. The method of claim 1, wherein the shielding gas comprises nitrogen or argon and the first predetermined temperature is 400 to 600 degrees.
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| CN202310280201.0A CN116274293A (en) | 2023-03-21 | 2023-03-21 | Recovery method of glass fiber composite material |
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| CN202310280201.0A CN116274293A (en) | 2023-03-21 | 2023-03-21 | Recovery method of glass fiber composite material |
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