Reflective thermal insulation aerogel composite thermal insulation material and preparation method thereof

Abstract

The invention discloses a reflective thermal insulation aerogel composite thermal insulation material and a preparation method thereof. The thermal insulation material is prepared from the following substances in parts by weight: 400 to 450 parts of modified Portland cement, 70 to 80 parts of fine-particle-size thermal insulation aggregate, 10 to 15 parts of aerogel, 1 to 1.5 parts of coarse-particle-size thermal insulation aggregate, 4 to 6 parts of thermal insulation material, 0.3 to 0.5 part of precipitated barium, 0.4 to 0.6 part of nucleating agent and water, the aerogel composite thermal insulation material has the beneficial effects that the modified Portland cement, the coarse and fine aggregate, the fiber thermal insulation material and the aerogel which are reasonable in composition and proportion are blended in the preparation raw materials, and the nucleating agent is matched for auxiliary crystallization, so that the prepared aerogel composite thermal insulation material is extremely low in heat conductivity coefficient and has good thermal insulation performance, and meanwhile, the thermal insulation effect is good. The interior of the material is blended and the exterior of the material is sprayed with precipitated barium, so that sunlight can be blocked and reflected, good sunscreen and weather-proof effects are achieved, the loss of ultraviolet light is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation materials, and in particular to a reflective heat-insulating aerogel composite thermal insulation material and a preparation method thereof. Background Art

[0002] External wall insulation is a thermal insulation method that sets insulation materials on one side of the external wall, usually achieved by using an external wall insulation system. The external wall insulation system is a multi-layer external wall composite system that can block water and moisture outside the external surface of the composite wall, and does not allow water to penetrate the system through the vertical wall surface or any openings and joints, thereby ensuring the long-term reliability of the system. It is a lightweight, environmentally friendly, non-load-bearing external building wall system that integrates energy saving, thermal insulation, sound insulation, and decorative effects.

[0003] At present, the commonly used materials in the field of industrial thermal insulation are mainly organic thermal insulation materials such as polyurethane, silicate fiber thermal insulation materials such as aluminum silicate fiber, and the latest aerogel felt. They each have inevitable defects in use. Thermal insulation coatings made of aerogel as the main material and other functional nanomaterials will soon replace traditional thermal insulation materials and become the mainstream of the industry with their low thermal conductivity, wide heat resistance range, green and low-carbon friendly environment, good flame retardancy, and simple construction technology. It is widely used in various fields of the national economy such as construction, industry and agriculture, national defense equipment, equipment manufacturing, automobile industry, environmental engineering, etc. It is an excellent coating for my country to vigorously promote energy conservation and emission reduction, building energy conservation and noise pollution prevention and control, and achieve green and low-carbon development.

[0004] However, the strength of the aerogel material itself is very low, and it is very easy to break and scatter from the gaps between inorganic fibers, resulting in loss of thermal insulation performance. The aggregation of broken aerogel materials causes the thermal insulation performance of the aerogel felt to be extremely uneven. Therefore, the bonding strength between the aerogel and the fiber raw materials is also an important factor affecting the application effect and life of this type of composite thermal insulation material. For this reason, the present application proposes a reflective insulating aerogel composite thermal insulation material. Summary of the invention

[0005] The object of the present invention is to provide a reflective heat-insulating aerogel composite thermal insulation material and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a reflective thermal insulation aerogel composite thermal insulation material, wherein the components include the following substances in parts by weight: 400-450 parts of modified silicate cement, 70-80 parts of fine-grained thermal insulation aggregate, 10-15 parts of aerogel, 1-1.5 parts of coarse-grained thermal insulation aggregate, 4-6 parts of thermal insulation material, 0.3-0.5 parts of precipitated barium, 0.4-0.6 parts of nucleating agent and water.

[0007] Preferably, the fine-grained thermal insulation aggregate is one of fly ash, silica ash and quartz powder, among which fly ash is preferred.

[0008] Preferably, the coarse-grained thermal insulation aggregate is one of polystyrene foam particles, expanded perlite and vitrified microspheres, among which polystyrene foam particles are preferred.

[0009] Preferably, the thermal insulation material is a blend of cellulose and PP fibers, and the ratio of cellulose to PP fibers is 4:1.

[0010] Preferably, the crystal nucleating agent is one or more of silicon oxide, silicon dioxide, titanium dioxide, zirconium dioxide and calcium silicate.

[0011] A method for preparing a reflective heat-insulating aerogel composite thermal insulation material comprises the following steps:

[0012] S1. Weigh the corresponding weight of raw materials according to the formula, and grind and screen the modified silicate cement, fine-grained thermal insulation aggregate and coarse-grained thermal insulation aggregate one by one;

[0013] S2. Place modified silicate cement, fine-grained thermal insulation aggregate and crystal nucleating agent in a mixing tank and add appropriate amount of water to mix thoroughly. After there are no particles in the tank, set aside;

[0014] S3, adding aerogel and coarse-grained thermal insulation aggregate to the above mixture, and after fully mixing, adding thermal insulation materials to blend to obtain slurry for standby use;

[0015] S4, distributing the precipitated barium in a weight ratio of 1:2, adding two portions of the precipitated barium to the above slurry and mixing, and adding the other portion of the precipitated barium to water and mixing, to prepare a precipitated barium aqueous solution for use;

[0016] S5, injecting the slurry into the mold, smoothing and compacting it, then spraying the precipitated barium aqueous solution evenly on the surface of the blank of the thermal insulation material, curing, demoulding and trimming the blank to obtain the thermal insulation material.

[0017] Preferably, the particle size of the fine-grained aggregate in step S1 is not greater than 1 mm, and the particle size of the coarse-grained thermal insulation aggregate is 2-4 mm.

[0018] Preferably, the time for mixing the aerogel and the coarse-grained thermal insulation aggregate in step S3 is 30-45 minutes, and the central stirring speed is 50±5 r / min, the wall scraping stirring speed is 40±5 r / min, and the homogenizing speed is 2500±100 r / min.

[0019] Preferably, the concentration of the precipitated barium aqueous solution in step S4 is 0.18-0.21 mg / ml.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: since the raw materials for its preparation contain modified silicate cement, coarse and fine aggregates, fiber-type thermal insulation materials and aerogel blended with reasonable composition and proportion, and a crystal nucleating agent is used to assist its crystallization, the thermal conductivity of the prepared aerogel composite thermal insulation material is extremely low and has good thermal insulation performance. At the same time, the internal blending and external spraying of precipitated barium in the material can block and reflect sunlight, and have good sun protection and weather resistance effects, thereby reducing the loss of ultraviolet light and extending the service life. DETAILED DESCRIPTION

[0021] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0023] The invention provides a technical solution: a reflective heat-insulating aerogel composite thermal insulation material, wherein each component comprises the following substances in parts by weight: 400-450 parts of modified silicate cement, 70-80 parts of fine-grained thermal insulation aggregate, 10-15 parts of aerogel, 1-1.5 parts of coarse-grained thermal insulation aggregate, 4-6 parts of thermal insulation material, 0.3-0.5 parts of precipitated barium, 0.4-0.6 parts of nucleating agent and water.

[0024] Preferably, the fine-grained thermal insulation aggregate is one of fly ash, silica ash and quartz powder, among which fly ash is preferred.

[0025] Preferably, the coarse-grained thermal insulation aggregate is one of polystyrene foam particles, expanded perlite and vitrified microspheres, among which polystyrene foam particles are preferred.

[0026] Preferably, the thermal insulation material is a blend of cellulose and PP fibers, and the ratio of cellulose to PP fibers is 4:1.

[0027] Preferably, the crystal nucleating agent is one or more of silicon oxide, silicon dioxide, titanium dioxide, zirconium dioxide and calcium silicate.

[0028] A method for preparing a reflective heat-insulating aerogel composite thermal insulation material comprises the following steps:

[0029] S1. Weigh the corresponding weight of raw materials according to the formula, and grind and screen the modified silicate cement, fine-grained thermal insulation aggregate and coarse-grained thermal insulation aggregate one by one;

[0030] S2. Place modified silicate cement, fine-grained thermal insulation aggregate and crystal nucleating agent in a mixing tank and add appropriate amount of water to mix thoroughly. After there are no particles in the tank, set aside;

[0031] S3, adding aerogel and coarse-grained thermal insulation aggregate to the above mixture, and after fully mixing, adding thermal insulation materials to blend to obtain slurry for standby use;

[0032] S4, distributing the precipitated barium in a weight ratio of 1:2, adding two portions of the precipitated barium to the above slurry and mixing, and adding the other portion of the precipitated barium to water and mixing, to prepare a precipitated barium aqueous solution for use;

[0033] S5, injecting the slurry into the mold, smoothing and compacting it, then spraying the precipitated barium aqueous solution evenly on the surface of the blank of the thermal insulation material, curing, demoulding and trimming the blank to obtain the thermal insulation material.

[0034] Preferably, the particle size of the fine-grained aggregate in step S1 is not greater than 1 mm, and the particle size of the coarse-grained thermal insulation aggregate is 2-4 mm.

[0035] Preferably, the time for mixing the aerogel and the coarse-grained thermal insulation aggregate in step S3 is 30-45 minutes, and the central stirring speed is 50±5 r / min, the wall scraping stirring speed is 40±5 r / min, and the homogenizing speed is 2500±100 r / min.

[0036] Preferably, the concentration of the precipitated barium aqueous solution in step S4 is 0.18-0.21 mg / ml.

[0037] Embodiment 1:

[0038] Take 400 parts of modified silicate cement, 70 parts of fly ash, 10 parts of aerogel, 1 part of polystyrene foam particles, 4 parts of cellulose, 1 part of PP fiber, 0.3 parts of precipitated barium, 0.4 parts of silicon dioxide and an appropriate amount of water, grind and screen the modified silicate cement, fly ash and polystyrene foam particles; put the modified silicate cement, fly ash and silicon dioxide in a mixing tank and add an appropriate amount of water to fully mix, and set aside after there are no particles in the tank; add aerogel and polystyrene foam particles to the above mixture, add thermal insulation material to blend after it is fully mixed, and obtain slurry for use; distribute the precipitated barium in a weight ratio of 1:2, add two parts of precipitated barium to the above slurry and mix, and add the other part of precipitated barium to water and mix well to obtain a precipitated barium aqueous solution for use; inject the slurry into a mold, smooth and compact it, and then evenly spray the precipitated barium aqueous solution on the surface of the blank of the thermal insulation material, and perform maintenance, demoulding and trimming on the blank to obtain the thermal insulation material.

[0039] Embodiment 2:

[0040] Take 450 parts of modified silicate cement, 75 parts of fly ash, 12 parts of aerogel, 1.3 parts of polystyrene foam particles, 3 parts of cellulose, 3.7 parts of PP fiber, 0.4 parts of precipitated barium, 0.5 parts of silicon dioxide and appropriate amount of water, grind and sieve the modified silicate cement, quartz powder and expanded perlite; put the modified silicate cement, quartz powder and silicon oxide in a mixing tank and add appropriate amount of water to fully mix, and set aside after there are no particles in the tank; add aerogel and polystyrene foam particles to the above mixture, add insulation material to blend after it is fully mixed, and obtain slurry for use; distribute the precipitated barium in a weight ratio of 1:2, add two parts of precipitated barium to the above slurry and mix, and add the other part of precipitated barium to water and mix well to obtain a precipitated barium aqueous solution for use; inject the slurry into a mold, smooth and compact it, and then evenly spray the precipitated barium aqueous solution on the surface of the blank of the thermal insulation material, and perform maintenance, demoulding and trimming on the blank to obtain the thermal insulation material.

[0041] Detection of reflective thermal insulation aerogel composite insulation materials:

[0042] Test steps:

[0043] The weathering test specimen is 3.01m wide, 2.01m high and 6.05m in area. 2 There is a 0.4m wide and 0.6m high window above the base wall for testing the external insulation of the window. The sample uses reflective insulation aerogel composite insulation material. The sample has been subjected to 80 cycles of high temperature (70℃) and water spraying (15℃) and 5 cycles of heating (50℃) and freezing (-20℃). The water spraying volume of the high temperature water spraying cycle is 1.2L / (m 2 / min) and ordinary single-layer hanging mesh impact strength test;

[0044] Test results: There is no cracking, hollowing or falling off on the exterior; the insulation layer is damaged when the tensile strength is 0.12Mpa, and the water absorption per hour is 372g / m 2 ; Under the impact intensity of 3.0J, multiple impact points were not damaged.

[0045] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reflective heat-insulating aerogel composite thermal insulation material, characterized in that: The components include the following substances by weight: 400-450 parts of modified silicate cement, 70-80 parts of fine-grained thermal insulation aggregate, 10-15 parts of aerogel, 1-1.5 parts of coarse-grained thermal insulation aggregate, 4-6 parts of thermal insulation material, 0.3-0.5 parts of precipitated barium, 0.4-0.6 parts of nucleating agent and water.

2. The reflective heat-insulating aerogel composite thermal insulation material according to claim 1, characterized in that: The fine-grained thermal insulation aggregate is one of fly ash, silica fume and quartz powder, among which fly ash is preferred.

3. The reflective heat-insulating aerogel composite thermal insulation material according to claim 1, characterized in that: The coarse-grained thermal insulation aggregate is one of polystyrene foam particles, expanded perlite and vitrified microspheres, among which polystyrene foam particles are preferred.

4. The reflective heat-insulating aerogel composite thermal insulation material according to claim 1, characterized in that: The thermal insulation material is a blend of cellulose and PP fibers, and the ratio of cellulose to PP fibers is 4:

1.

5. The reflective heat-insulating aerogel composite thermal insulation material according to claim 1, characterized in that: The crystal nucleating agent is one or more of silicon oxide, silicon dioxide, titanium dioxide, zirconium dioxide and calcium silicate.

6. A method for preparing a reflective heat-insulating aerogel composite thermal insulation material, characterized in that: The following steps are involved: S1. Weigh the corresponding weight of raw materials according to the formula, and grind and screen the modified silicate cement, fine-grained thermal insulation aggregate and coarse-grained thermal insulation aggregate one by one; S2. Place modified silicate cement, fine-grained thermal insulation aggregate and crystal nucleating agent in a mixing tank and add appropriate amount of water to mix thoroughly. After there are no particles in the tank, set aside; S3, adding aerogel and coarse-grained thermal insulation aggregate to the above mixture, and after fully mixing, adding thermal insulation materials to blend to obtain slurry for standby use; S4, distributing the precipitated barium in a weight ratio of 1:2, adding two portions of the precipitated barium to the above slurry and mixing, and adding the other portion of the precipitated barium to water and mixing, to prepare a precipitated barium aqueous solution for use; S5, injecting the slurry into the mold, smoothing and compacting it, then spraying the precipitated barium aqueous solution evenly on the surface of the blank of the thermal insulation material, curing, demoulding and trimming the blank to obtain the thermal insulation material.

7. The method for preparing a reflective heat-insulating aerogel composite thermal insulation material according to claim 6, characterized in that: The particle size of the fine-grained aggregate in step S1 is no more than 1 mm, and the particle size of the coarse-grained thermal insulation aggregate is 2-4 mm.

8. The method for preparing a reflective heat-insulating aerogel composite thermal insulation material according to claim 6, characterized in that: In step S3, the time for mixing the aerogel and the coarse-grained thermal insulation aggregate is 30-45 minutes, and the central stirring speed is 50±5 r / min, the wall scraping stirring speed is 40±5 r / min, and the homogenizing speed is 2500±100 r / min.

9. The method for preparing a reflective heat-insulating aerogel composite thermal insulation material according to claim 6, characterized in that: The concentration of the precipitated barium aqueous solution in step S4 is 0.18-0.21 mg / ml.