Building waste regenerated insulating brick and preparation method thereof

Abstract

The invention relates to the field of environment-friendly building materials, and particularly discloses a construction waste regenerated insulating brick and a preparation method thereof. The construction waste regenerated insulating brick is prepared from the following raw material components in parts by mass: 80 to 95 parts of construction waste regenerated filler, 60 to 65 parts of composite insulating carbon fiber material, 15 to 35 parts of waste ceramic aggregate, 5 to 10 parts of mica modified rubber particles, 5 to 30 parts of binder and 30 to 40 parts of water. According to the invention, the composite thermal insulation carbon fiber material is used as a skeleton, and the construction waste regenerated filler, the waste ceramic aggregate and the mica modified rubber particles are used as filling materials to fill the skeleton, so that the regenerated thermal insulation brick which has thermal insulation performance and can guarantee mechanical properties is prepared. The problems that in the prior art, construction waste regenerated building materials are weak in mechanical property and poor in compatibility with functional materials, and the requirements of the functional building materials cannot be met are effectively solved.

Description

Technical Field

[0001] The invention relates to the field of environmentally friendly building materials, and specifically discloses a building waste recycled thermal insulation brick and a preparation method thereof. Background Art

[0002] According to surveys, in recent years, the total amount of construction waste in my country has exceeded 1.5 billion tons each year, accounting for about 40% of urban waste, which has seriously polluted the environment. The main components of construction waste include: scattered mortar and concrete, broken bricks and broken concrete blocks, scattered yellow sand, gravel, stone blocks, slag, waste steel bars, waste iron wires, various waste steel accessories, and metal pipeline wastes during transportation. Due to the construction waste treatment technology and treatment cost, most of the construction waste is pulled to open places for on-site burial or randomly piled in the open air. With the development of the construction industry, construction waste will increase. If it is not handled properly, it will have a bad impact on the ecological environment. Therefore, how to effectively treat construction waste and reuse it has become an urgent problem to be solved.

[0003] In the prior art, engineers have made a lot of efforts to solve the above problems. The most common thing is to use construction waste as recycled aggregate to make recycled bricks or blocks, or to match them with bonding materials such as cement to form building components with recycled concrete properties. However, the mechanical properties of this type of recycled building materials are generally poor and cannot meet normal use requirements. They can only be used as building auxiliary materials. In addition, this type of recycled building material has poor compatibility with functional materials and cannot meet functional building requirements. Based on this, the development of a construction waste recycled building material that has good compatibility with functional materials and excellent mechanical properties is of great significance to the field of construction waste treatment. Summary of the invention

[0004] In view of the problem that the construction waste recycled building materials in the prior art have weak mechanical properties and poor compatibility with functional materials, and cannot meet the requirements of functional building materials, the present invention provides a construction waste recycled thermal insulation brick and a preparation method thereof. The present invention obtains a recycled filler by recycling construction waste, and then coats the surface of porous carbon fiber with thermal insulation resin, uses composite thermal insulation carbon fiber material as a skeleton, and fills the skeleton with the recycled filler, waste ceramic aggregate and mica modified rubber particles to obtain a recycled thermal insulation brick that has both thermal insulation performance and mechanical properties.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following specific technical solutions: The first aspect of the present invention provides a construction waste recycled thermal insulation brick, comprising the following raw material components in parts by weight: 80-95 parts of construction waste recycled filler, 60-65 parts of composite thermal insulation carbon fiber material, 15-35 parts of waste ceramic aggregate, 5-10 parts of mica modified rubber particles, 5-30 parts of binder and 30-40 parts of water.

[0006] Compared with the prior art, the present invention first designs a composite thermal insulation carbon fiber material with thermal insulation performance, and uses it as the skeleton material of the recycled thermal insulation brick. Since the carbon fiber has toughness and a certain rigidity, it can give the recycled thermal insulation brick good durability and impact resistance and crack resistance. The carbon fiber coated with the thermal insulation material can not only make the thermal insulation material have good compatibility with other materials, ensure the thermal insulation performance of the recycled thermal insulation brick, but also further improve the material continuity and integrity of the recycled thermal insulation brick, thereby improving the apparent density of the recycled thermal insulation brick. The present invention also regenerates the construction waste to obtain the construction waste recycled filler. The construction waste recycled filler and the waste ceramic aggregate and mica modified rubber particles are used together as coarse and fine aggregates of different particle sizes and filled in the skeleton material. Among them, the construction waste recycled filler contains mortar on the surface. When it is used as a filler in the recycled thermal insulation brick, it can effectively improve the internal porosity of the recycled thermal insulation brick, thereby improving the thermal insulation performance of the recycled thermal insulation brick.

[0007] Although rubber particles can improve the thermal insulation performance of recycled bricks to a certain extent as fillers, they will reduce the mechanical properties of recycled bricks while improving the thermal insulation performance of recycled bricks. Based on this, the present invention designs a mica-modified rubber particle, and the mica layer can play a role of physical barrier in the rubber matrix, effectively improve the strength and modulus of rubber, so that it can effectively improve the compressive strength of recycled bricks as one of the aggregates. And the flaky structure of mica can effectively prevent the generation of rubber cracks, thereby improving the crack resistance of rubber particles. More importantly, the high stability of mica helps rubber maintain good elasticity and wear resistance under high temperature environment, thereby delaying the service life of recycled insulation bricks. The present invention also adds waste ceramic aggregates and binder components, and uses the synergistic effect of each component to successfully prepare a construction waste recycled insulation brick with excellent mechanical properties and good thermal insulation performance, which effectively solves the problem that the mechanical properties of construction waste recycled building materials in the prior art are weak, and the compatibility with functional materials is poor, and the requirements of functional building materials cannot be met, providing a new idea for the reuse of construction waste.

[0008] Preferably, the method for preparing the construction waste recycled filler comprises the following steps: S1. Remove impurities from the construction waste, crush it, and screen it to obtain pre-processed construction waste; S2. Evenly mix the pretreated construction waste with red mud and fly ash, granulate, and sinter at 600° C.-700° C. to obtain construction waste recycled filler.

[0009] Further preferably, in S1, the impurity removal process is: immersing the construction waste in water, stirring at a rotation speed of 800rpm-1000rpm for 5min-10min, standing, discarding suspended matter, filtering, and drying to obtain the construction waste after impurity removal.

[0010] Further preferably, in S1, the particle size of the pre-treated construction waste is 0.5 mm-2 mm.

[0011] Further preferably, in S2, the amount of red mud added is 20wt%-35wt% of the pretreated construction waste.

[0012] Further preferably, in S2, the added amount of fly ash is 10wt%-20wt% of the pretreated construction waste.

[0013] Further preferably, in S2, the sintering time is 3h-4h.

[0014] Preferably, the particle size of the construction waste recycled filler is 1mm-3mm.

[0015] Preferably, the method for preparing the composite thermal insulation carbon fiber material comprises the following steps: Step a, surface oxidizing the chopped carbon fiber at 250° C.-350° C. to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in water, adding a dispersant, and performing ultrasonic treatment to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at high temperature to obtain porous fibers; Step d, immersing the porous fibers in liquid thermal insulation resin, filtering, and curing to obtain composite thermal insulation carbon fiber material.

[0016] Further preferably, in step a, the length of the chopped carbon fiber is 0.5 mm-1.5 mm.

[0017] Further preferably, in step a, the holding time of the surface oxidation is 2h-4h.

[0018] Further preferably, in step b, the mass volume ratio of the pretreated carbon fiber to water is 1 g:4 mL-1 g:6 mL.

[0019] Further preferably, in step b, the dispersant is hydroxyethyl cellulose.

[0020] Further preferably, in step b, the amount of the dispersant added is 10%-15% of the mass of the pretreated carbon fiber.

[0021] Further preferably, in step b, the ultrasonic frequency of the ultrasonic treatment is 35kHz-40kHz, and the time of the ultrasonic treatment is 30min-40min.

[0022] Further preferably, in step c, the temperature of the high temperature sintering is 700° C.-800° C., and the time of the high temperature sintering is 3 h-4 h.

[0023] Further preferably, in step d, the liquid thermal insulation resin comprises the following raw material components in percentage by mass: 30%-35% of expanded perlite powder, 10%-15% of sepiolite powder and the remainder of phenolic resin.

[0024] Further preferably, in step d, the mass ratio of the porous fibers to the liquid thermal insulation resin is 1:2-1:4.

[0025] Further preferably, in step d, the curing temperature is 120° C.-140° C., and the curing time is 5 min-10 min.

[0026] More preferably, the particle size of the expanded pearlite powder is 10nm-50nm.

[0027] More preferably, the particle size of the sepiolite powder is 50nm-100nm.

[0028] Further preferably, the method for preparing the mica-modified rubber particles comprises the following steps: mixing mica powder, waste rubber powder and a processing aid uniformly and then smelting to obtain the mica-modified rubber particles.

[0029] More preferably, the mass ratio of the mica powder to the waste rubber powder is 0.2:1-0.3:1.

[0030] More preferably, the processing aid comprises cyclohexane oil, sulfur and accelerator DM in a mass ratio of 10:1:1-10:1.2:1.

[0031] More preferably, the added amount of the processing aid is 10%-15% of the mass of the waste rubber powder.

[0032] More preferably, the smelting temperature is 200°C-220°C, and the smelting time is 30min-40min.

[0033] Further preferably, the particle size of the waste ceramic aggregate is 200 μm-300 μm.

[0034] Further preferably, the binder is silicate cement.

[0035] The second aspect of the present invention provides a method for preparing building waste recycled thermal insulation bricks, comprising the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, mix them evenly, add them into the recycled brick mold, and pressurize them to obtain the recycled thermal insulation brick blank; Step 2: Curing the recycled thermal insulation brick blanks to obtain construction waste recycled thermal insulation bricks.

[0036] Preferably, in step 1, the specific operation of pressurizing is: pressurizing to 10MPa-12MPa once, maintaining the pressure for 3min-5min, and pressurizing to 40MPa-50MPa for the second time, maintaining the pressure for 5min-8min.

[0037] Preferably, the curing temperature is 20°C-23°C, and the humidity is 60%-65%.

[0038] Preferably, the curing time is 20h-30h.

[0039] In summary, the present invention uses composite thermal insulation carbon fiber material as a skeleton, and uses construction waste recycled filler, waste ceramic aggregate and mica modified rubber particles as filling materials to fill the skeleton, thereby preparing a recycled thermal insulation brick that has both thermal insulation performance and mechanical properties. The technical solution of the present invention effectively solves the problem that construction waste recycled building materials in the prior art have weak mechanical properties, poor compatibility with functional materials, and cannot meet the requirements of functional building materials, and provides a new processing idea for the reuse of construction waste. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1 This embodiment provides a construction waste recycled thermal insulation brick and a preparation method thereof, the specific contents are as follows: The construction waste recycled thermal insulation bricks include the following raw material components in mass fractions: 90 parts of construction waste recycled filler, 63 parts of composite thermal insulation carbon fiber material, 30 parts of waste ceramic aggregate, 5 parts of mica modified rubber particles, 25 parts of silicate cement and 35 parts of water.

[0042] The method for preparing the construction waste recycled thermal insulation brick comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, put them into a mixing tank, stir them mechanically at a speed of 400 rpm, stir for 30 minutes, mix them evenly, add them into a recycled brick mold, first pressurize them to 10 MPa, hold the pressure for 4 minutes, and then pressurize them to 45 MPa for a second time, hold the pressure for 7 minutes, and obtain recycled thermal insulation brick blanks; Step 2: Curing the recycled thermal insulation brick blanks at a temperature of 22° C. and a humidity of 63% for 25 hours to obtain construction waste recycled thermal insulation bricks.

[0043] The method for preparing the construction waste recycled filler comprises the following steps: S1. Soak 1 kg of construction waste in water, stir at a speed of 900 rpm for 8 min, let stand, discard suspended matter, filter, and dry to obtain construction waste after impurities are removed; crush the construction waste after impurities are removed, screen, and obtain pre-treated construction waste with a particle size of 1.5 mm; S2. The pretreated construction waste is mixed evenly with 200 g of red mud and 150 g of fly ash, granulated, and sintered at 650° C. for 3.5 h to obtain construction waste recycled filler.

[0044] The preparation method of the composite thermal insulation carbon fiber material comprises the following steps: Step a, 300 g of 1 mm long chopped carbon fiber is surface oxidized at 300° C. for 3 h to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in 1500 mL of water, adding 40 g of hydroxyethyl cellulose, and performing ultrasonic treatment at an ultrasonic frequency of 38 kHz for 35 min to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at 750° C. for 4 hours to obtain porous fibers; Step d, impregnating the porous fiber in 900g of liquid thermal insulation resin, filtering, and curing the filtered solid filtrate at 130°C for 8min to obtain a composite thermal insulation carbon fiber material, wherein the raw material components of the liquid thermal insulation resin are: 33% of 40nm expanded perlite powder, 12% of 80nm sepiolite powder and 55% of phenolic resin.

[0045] The preparation method of the mica modified rubber particles comprises the following steps: 25g of mica powder, 100g of waste rubber powder, 10g of cyclohexane oil, 1g of sulfur and 1g of accelerator DM are uniformly mixed, and smelted at 220°C for 35min to obtain the mica modified rubber particles.

[0046] The particle size of the waste ceramic aggregate is 250 μm.

[0047] Example 2 This embodiment provides a construction waste recycled thermal insulation brick and a preparation method thereof, the specific contents are as follows: The construction waste recycled thermal insulation brick comprises the following raw material components in mass fraction: 80 parts of construction waste recycled filler, 65 parts of composite thermal insulation carbon fiber material, 35 parts of waste ceramic aggregate, 10 parts of mica modified rubber particles, 20 parts of silicate cement and 40 parts of water.

[0048] The method for preparing the construction waste recycled thermal insulation brick comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, put them into a mixing tank, stir them mechanically at a speed of 400 rpm, stir for 30 minutes, mix them evenly, add them into the recycled brick mold, first pressurize them to 12 MPa, keep the pressure for 3 minutes, and then pressurize them to 50 MPa for a second time, keep the pressure for 5 minutes, and obtain the recycled thermal insulation brick blank; Step 2: Curing the recycled thermal insulation brick blanks at a temperature of 23° C. and a humidity of 60% for 28 hours to obtain construction waste recycled thermal insulation bricks.

[0049] The method for preparing the construction waste recycled filler comprises the following steps: S1. Soak 1 kg of construction waste in water, stir at a speed of 900 rpm for 8 min, let stand, discard suspended matter, filter, and dry to obtain construction waste after impurities are removed; crush and screen the construction waste after impurities are removed to obtain pre-treated construction waste with a particle size of 2 mm; S2. The pretreated construction waste is uniformly mixed with 200 g of red mud and 150 g of fly ash, granulated, and sintered at 600° C. for 4 h to obtain construction waste recycled filler.

[0050] The preparation method of the composite thermal insulation carbon fiber material comprises the following steps: Step a, 300 g of 1 mm long chopped carbon fiber is surface oxidized at 350° C. for 2.5 h to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in 1500 mL of water, adding 40 g of hydroxyethyl cellulose, and performing ultrasonic treatment at an ultrasonic frequency of 40 kHz for 35 min to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at 700° C. for 4 hours to obtain porous fibers; Step d, impregnating the porous fiber in 900g of liquid thermal insulation resin, filtering, and curing the filtered solid filtrate at 130°C for 8min to obtain a composite thermal insulation carbon fiber material, wherein the raw material components of the liquid thermal insulation resin are: 30% of 40nm expanded perlite powder, 15% of 80nm sepiolite powder and 55% of phenolic resin.

[0051] The preparation method of the mica modified rubber particles comprises the following steps: 25g of mica powder, 100g of waste rubber powder, 10g of cyclohexane oil, 1.1g of sulfur and 1g of accelerator DM are uniformly mixed, and smelted at 220°C for 35min to obtain the mica modified rubber particles.

[0052] The particle size of the waste ceramic aggregate is 300 μm.

[0053] Example 3 This embodiment provides a construction waste recycled thermal insulation brick and a preparation method thereof, the specific contents are as follows: The construction waste recycled thermal insulation brick comprises the following raw material components in mass fraction: 95 parts of construction waste recycled filler, 60 parts of composite thermal insulation carbon fiber material, 18 parts of waste ceramic aggregate, 10 parts of mica modified rubber particles, 15 parts of silicate cement and 30 parts of water.

[0054] The method for preparing the construction waste recycled thermal insulation brick comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, put them into a mixing tank, stir them mechanically at a speed of 400 rpm, stir for 30 minutes, mix them evenly, add them into a recycled brick mold, first pressurize them to 10 MPa, hold the pressure for 4 minutes, and then pressurize them to 45 MPa for a second time, hold the pressure for 7 minutes, and obtain recycled thermal insulation brick blanks; Step 2: Curing the recycled thermal insulation brick blanks at a temperature of 22° C. and a humidity of 63% for 25 hours to obtain construction waste recycled thermal insulation bricks.

[0055] The method for preparing the construction waste recycled filler comprises the following steps: S1. Soak 1 kg of construction waste in water, stir at a speed of 900 rpm for 8 min, let stand, discard suspended matter, filter, and dry to obtain construction waste after impurities are removed; crush and screen the construction waste after impurities are removed to obtain pre-treated construction waste with a particle size of 1 mm; S2. The pretreated construction waste is uniformly mixed with 300 g of red mud and 200 g of fly ash, granulated, and sintered at 600° C. for 4 h to obtain construction waste recycled filler.

[0056] The preparation method of the composite thermal insulation carbon fiber material comprises the following steps: Step a, 300 g of 1 mm long chopped carbon fiber is surface oxidized at 280° C. for 4 h to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in 1600 mL of water, adding 38 g of hydroxyethyl cellulose, and performing ultrasonic treatment at an ultrasonic frequency of 38 kHz for 35 min to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at 800° C. for 3 hours to obtain porous fibers; Step d, impregnating the porous fiber in 900g of liquid thermal insulation resin, filtering, and curing the filtered solid filtrate at 130°C for 8min to obtain a composite thermal insulation carbon fiber material, wherein the raw material components of the liquid thermal insulation resin are: 35% of 40nm expanded perlite powder, 15% of 80nm sepiolite powder and 50% of phenolic resin.

[0057] The preparation method of the mica modified rubber particles comprises the following steps: 25g of mica powder, 100g of waste rubber powder, 10g of cyclohexane oil, 1.2g of sulfur and 1g of accelerator DM are uniformly mixed, and smelted at 220°C for 35min to obtain the mica modified rubber particles.

[0058] The particle size of the waste ceramic aggregate is 200 μm.

[0059] Comparative Example 1 This comparative example provides a building waste recycled thermal insulation brick, which is different from Example 1 in that the composite thermal insulation carbon fiber material is replaced with a liquid thermal insulation resin, and other components and processes remain unchanged, specifically including the following contents: The construction waste recycled thermal insulation brick comprises the following raw material components in mass fractions: 90 parts of construction waste recycled filler, 63 parts of liquid thermal insulation resin, 30 parts of waste ceramic aggregate, 5 parts of mica modified rubber particles, 25 parts of silicate cement and 35 parts of water.

[0060] The method for preparing the construction waste recycled thermal insulation brick comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, put them into a mixing tank, stir them mechanically at a speed of 400 rpm, stir for 30 minutes, mix them evenly, add them into a recycled brick mold, first pressurize them to 10 MPa, hold the pressure for 4 minutes, and then pressurize them to 45 MPa for a second time, hold the pressure for 7 minutes, and obtain recycled thermal insulation brick blanks; Step 2: Curing the recycled thermal insulation brick blanks at a temperature of 22° C. and a humidity of 63% for 25 hours to obtain construction waste recycled thermal insulation bricks.

[0061] The method for preparing the construction waste recycled filler comprises the following steps: S1. Soak 1 kg of construction waste in water, stir at a speed of 900 rpm for 8 min, let stand, discard suspended matter, filter, and dry to obtain construction waste after impurities are removed; crush the construction waste after impurities are removed, screen, and obtain pre-treated construction waste with a particle size of 1.5 mm; S2. The pretreated construction waste is mixed evenly with 200 g of red mud and 150 g of fly ash, granulated, and sintered at 650° C. for 3.5 h to obtain construction waste recycled filler.

[0062] The raw material components of the liquid thermal insulation resin are: 33% of 40nm expanded pearlite powder, 12% of 80nm sepiolite powder and 55% of phenolic resin.

[0063] The preparation method of the mica modified rubber particles comprises the following steps: 25g of mica powder, 100g of waste rubber powder, 10g of cyclohexane oil, 1g of sulfur and 1g of accelerator DM are uniformly mixed, and smelted at 220°C for 35min to obtain the mica modified rubber particles.

[0064] The particle size of the waste ceramic aggregate is 250 μm.

[0065] Comparative Example 2 This comparative example provides a building waste recycled insulation brick, which is different from Example 1 in that the mica-modified rubber particles are replaced with waste rubber particles, and the other components and processes remain unchanged, specifically including the following contents: The construction waste recycled thermal insulation bricks include the following raw material components in mass fractions: 90 parts of construction waste recycled filler, 63 parts of composite thermal insulation carbon fiber material, 30 parts of waste ceramic aggregate, 5 parts of waste rubber particles, 25 parts of silicate cement and 35 parts of water.

[0066] The method for preparing the construction waste recycled thermal insulation brick comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, put them into a mixing tank, stir them mechanically at a speed of 400 rpm, stir for 30 minutes, mix them evenly, add them into a recycled brick mold, first pressurize them to 10 MPa, hold the pressure for 4 minutes, and then pressurize them to 45 MPa for a second time, hold the pressure for 7 minutes, and obtain recycled thermal insulation brick blanks; Step 2: Curing the recycled thermal insulation brick blanks at a temperature of 22° C. and a humidity of 63% for 25 hours to obtain construction waste recycled thermal insulation bricks.

[0067] The method for preparing the construction waste recycled filler comprises the following steps: S1. Soak 1 kg of construction waste in water, stir at a speed of 900 rpm for 8 min, let stand, discard suspended matter, filter, and dry to obtain construction waste after impurities are removed; crush the construction waste after impurities are removed, screen, and obtain pre-treated construction waste with a particle size of 1.5 mm; S2. The pretreated construction waste is mixed evenly with 200 g of red mud and 150 g of fly ash, granulated, and sintered at 650° C. for 3.5 h to obtain construction waste recycled filler.

[0068] The preparation method of the composite thermal insulation carbon fiber material comprises the following steps: Step a, 300 g of 1 mm long chopped carbon fiber is surface oxidized at 300° C. for 3 h to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in 1500 mL of water, adding 40 g of hydroxyethyl cellulose, and performing ultrasonic treatment at an ultrasonic frequency of 38 kHz for 35 min to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at 750° C. for 4 hours to obtain porous fibers; Step d, impregnating the porous fiber in 900g of liquid thermal insulation resin, filtering, and curing the filtered solid filtrate at 130°C for 8min to obtain a composite thermal insulation carbon fiber material, wherein the raw material components of the liquid thermal insulation resin are: 33% of 40nm expanded perlite powder, 12% of 80nm sepiolite powder and 55% of phenolic resin.

[0069] The particle size of the waste ceramic aggregate is 250 μm.

[0070] In order to further reflect the technical effect of the present invention, the present invention carried out performance tests on the construction waste recycled insulation bricks obtained in Examples 1-3 and Comparative Examples 1-2, and carried out main body dry apparent density test, thermal conductivity test and strength grade test on each recycled brick with reference to the JG / T407-2013 standard. The results are shown in Table 1.

[0071] Table 1 Performance test results of construction waste recycled insulation bricks obtained in various embodiments and comparative examples

[0072] It can be seen from Table 1 that the performance of the construction waste recycled insulation bricks provided by the embodiments of the present invention is significantly better than that of the construction waste recycled insulation bricks provided by the comparative examples, especially the recycled insulation bricks obtained in Example 1, which have a dry apparent density of 839 kg / m3, a thermal conductivity as low as 0.14 W / mK, a heat storage coefficient of 5.28 W / mK, and a 28d compressive strength of up to 10.62 MPa, which confirms that the recycled bricks have good thermal insulation performance and mechanical strength.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction waste recycled insulation brick, characterized by: The invention comprises the following raw material components in parts by weight: 80-95 parts of recycled filling material from construction waste, 60-65 parts of composite heat-insulating carbon fiber material, 15-35 parts of waste ceramic aggregate, 5-10 parts of mica-modified rubber particles, 5-30 parts of adhesive and 30-40 parts of water.

2. The construction waste recycled insulation brick according to claim 1, characterized in that: The preparation method of the construction waste recycled filler comprises the following steps: S1. Remove impurities from the construction waste, crush it, and screen it to obtain pre-processed construction waste; S2. Evenly mix the pretreated construction waste with red mud and fly ash, granulate, and sinter at 600° C.-700° C. to obtain construction waste recycled filler.

3. The construction waste recycled insulation brick according to claim 2, characterized in that: In S1, the particle size of the pre-treated construction waste is 0.5 mm-2 mm; and / or In S2, the amount of red mud added is 20wt%-35wt% of the pretreated construction waste; and / or In S2, the fly ash is added in an amount of 10wt%-20wt% of the pre-treated construction waste; and / or In S2, the sintering time is 3h-4h.

4. The construction waste recycled insulation brick according to claim 1, characterized in that: The preparation method of the composite thermal insulation carbon fiber material comprises the following steps: Step a, surface oxidizing the chopped carbon fiber at 250° C.-350° C. to obtain pretreated carbon fiber; Step b, dispersing the pretreated carbon fiber in water, adding a dispersant, and performing ultrasonic treatment to obtain a fiber slurry, and performing solid-liquid separation on the fiber slurry to obtain a porous fiber precursor; Step c, sintering the porous fiber precursor at high temperature to obtain porous fibers; Step d, immersing the porous fibers in liquid thermal insulation resin, filtering, and curing to obtain composite thermal insulation carbon fiber material.

5. The construction waste recycled insulation brick according to claim 4, characterized in that: In step a, the length of the chopped carbon fiber is 0.5 mm to 1.5 mm; and / or In step a, the surface oxidation holding time is 2h-4h; and / or In step b, the mass volume ratio of the pretreated carbon fiber to water is 1g:4mL-1g:6mL; and / or In step b, the dispersant is hydroxyethyl cellulose; and / or In step b, the amount of the dispersant added is 10%-15% of the mass of the pretreated carbon fiber; and / or In step b, the ultrasonic frequency of the ultrasonic treatment is 35kHz-40kHz, and the time of the ultrasonic treatment is 30min-40min.

6. The construction waste recycled insulation brick according to claim 4, characterized in that: In step c, the high temperature sintering temperature is 700°C-800°C, and the high temperature sintering time is 3h-4h; and / or In step d, the liquid thermal insulation resin comprises the following raw material components in percentage by weight: 30%-35% of expanded perlite powder, 10%-15% of sepiolite powder and the remainder of phenolic resin.

7. The construction waste recycled insulation brick according to claim 1, characterized in that: The preparation method of the mica modified rubber particles comprises the following steps: mica powder, waste rubber powder and a processing aid are uniformly mixed and then smelted to obtain the mica modified rubber particles.

8. The construction waste recycled thermal insulation brick according to claim 7, characterized in that: The mass ratio of the mica powder to the waste rubber powder is 0.2:1-0.3:1; and / or The processing aid comprises naphthenic oil, sulfur and accelerator DM in a mass ratio of 10:1:1-10:1.2:1; and / or The amount of the processing aid added is 10%-15% of the mass of the waste rubber powder; and / or The smelting temperature is 200° C.-220° C., and the smelting time is 30 min-40 min.

9. A method for preparing a building waste recycled thermal insulation brick according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: weigh the raw materials of each component according to the designed ratio, mix them evenly, add them into the recycled brick mold, and pressurize them to obtain the recycled thermal insulation brick blank; Step 2: Curing the recycled thermal insulation brick blanks to obtain construction waste recycled thermal insulation bricks.

10. The method for preparing the building waste recycled thermal insulation brick according to claim 9, characterized in that: In step 1, the specific operation of pressurizing is: pressurizing to 10MPa-12MPa once, maintaining the pressure for 3min-5min, and pressurizing to 40MPa-50MPa twice, maintaining the pressure for 5min-8min; and / or The curing temperature is 20°C-23°C and the humidity is 60%-65%; and / or The curing time is 20h-30h.

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