Fireproof ultralow-heat-conduction external wall thermal insulation material and preparation process thereof

Abstract

The invention belongs to the technical field of thermal insulation materials, and discloses a fireproof and ultralow-thermal-conductivity external wall thermal insulation material and a preparation process thereof. The aerogel composite insulation board is prepared from the following raw materials in parts by weight: 400-450 parts of magnesium oxide, 300-350 parts of magnesium sulfate, 30-50 parts of non-woven fabric, 2-5 parts of polyphenyl granules, 40-60 parts of silica fume, 10-20 parts of saw dust, 3-6 parts of a waterproof agent, 10-15 parts of a modifier and 2-5 parts of a foaming agent. During preparation, the used main materials and auxiliary materials are all inorganic materials, and the materials have stable performance at-60 DEG C to 900 DEG C, are smokeless and non-toxic at a high temperature, have fireproof performance up to grade A and have a heat conductivity coefficient up to 0.012 V / (n.K), so that compared with a traditional organic heat-insulating material, the product has better heat-insulating performance, also can be suitable for water vapor permeation resistance, and has a good heat-insulating effect. The breathable performance of the wall body is guaranteed, and damage of water vapor in the wall body to an enclosure structure and an outer wall facing due to temperature change is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal insulation materials, and specifically relates to a fireproof, ultra-low thermal conductivity exterior wall thermal insulation material and a preparation process thereof. Background Art

[0002] Exterior wall insulation material is a specially designed insulation material used for the exterior walls of buildings. This insulation material can improve the indoor environment, make the indoor temperature more comfortable, reduce dependence on air conditioning and heating, and extend the service life of the building. Since it reduces the damage to the wall caused by temperature changes, it extends the maintenance cycle and service life of the building.

[0003] Current insulation materials, such as graphite polystyrene boards, EPS polystyrene boards or extruded boards, are all made of inorganic materials. These materials are easy to burn at high temperatures and release toxic smoke, posing a serious threat to personnel safety and building structures. At the same time, the thermal conductivity of traditional insulation materials is relatively high, resulting in limited insulation effects, which makes it difficult to meet the requirements of modern buildings for high efficiency and energy saving.

[0004] Secondly, traditional insulation devices also have shortcomings in weather resistance and system safety. They are easily affected by environmental factors such as corrosion and weathering, which leads to a decrease in insulation performance and affects the service life of the building. Therefore, they need to be improved and optimized. Summary of the invention

[0005] The object of the present invention is to provide a fireproof, ultra-low thermal conductivity exterior wall insulation material and a preparation process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a fireproof, ultra-low thermal conductivity exterior wall insulation material and a preparation process thereof, comprising an aerogel composite insulation board, wherein the aerogel composite insulation board is composed of the following raw materials in parts by weight: 400-450 parts of magnesium oxide, 300-350 parts of magnesium sulfate, 30-50 parts of non-woven fabrics, 2-5 parts of polystyrene particles, 40-60 parts of silica fume, 10-20 parts of sawdust, 3-6 parts of waterproofing agent, 10-15 parts of modifier and 2-5 parts of foaming agent.

[0007] Preferably, the thermal insulation material also includes 1-2 parts of scraps and 0.3-0.5 parts of unqualified products, and the scraps and unqualified products are crushed and used as the base material.

[0008] Preferably, the preparation process of the aerogel composite insulation board is: Step 1, raw material preparation: put magnesium oxide, magnesium sulfate, non-woven fabric, polystyrene particles, silica fume and sawdust into the feeder one by one according to the formula ratio; Step 2: Mixing and stirring: feeding the mixture outputted from the feeder into a mixer, and adding 140-150 parts of water and a modifier, a waterproofing agent and a foaming agent in a formula ratio to stir and mix; Step 3, demoulding and curing: the evenly stirred slurry is introduced into the mold, and after the shaping, it enters the curing stage, and after the curing is completed, the demoulding operation is performed; Step 4: Cutting and sorting: The semi-finished products that have been cured are accurately cut according to the specifications using cutting equipment, and the scraps generated during the cutting process are collected; Step five, grading inspection, inspect the finished materials after cutting, test their density, thermal conductivity and fire performance indicators, collect unqualified products for backup, and pack and store qualified products.

[0009] Preferably, in the step 2, when performing the mixing operation, premix at a low speed for 1-2 minutes, then stir evenly at a high speed for 6-8 minutes, and finally vacuum degas for 2 minutes; In the low-speed premixing stage, 70% of the water can be added first, and then the remaining 30% can be gradually added.

[0010] Preferably, the curing environment in the curing stage should be maintained at 20-25° C., the relative humidity should be controlled at 70%-90%, and the curing time should be 12-24 hours.

[0011] Preferably, in step 1, the scraps and unqualified products generated during cutting and inspection can be put into a crusher according to proportion and crushed, and after the crushing is completed, they are added to the feeder and mixed with new materials for use.

[0012] Preferably, in the raw material preparation stage, sawdust, polystyrene particles, magnesium oxide and silica fume are first screened to ensure that the purity and particle size of the materials meet the specified requirements.

[0013] Preferably, in the grading inspection stage, the density and uniformity of the material are inspected by an X-ray density analyzer, and the thermal conductivity of the product is inspected by a laser thermal conductivity analyzer.

[0014] The beneficial effects of the present invention are as follows: 1. In the preparation of the present invention, the main materials and auxiliary materials used are all inorganic materials. Such materials can have stable performance between -60°C and 900°C, are smokeless and non-toxic at high temperatures, have fire resistance of Class A, and have a thermal conductivity of 0.012V / (n·K), breaking through the technical barrier of high thermal conductivity of inorganic materials. Compared with traditional organic thermal insulation materials, the product has better thermal insulation performance, is not only corrosion-resistant, acid-resistant, alkali-resistant, weathering-resistant, and non-powdering, but also has a suitable water vapor permeability resistance, ensuring the breathability of the wall, reducing the damage of the water vapor in the wall to the enclosure structure and the exterior wall finish due to temperature changes, and improving the durability of the building.

[0015] 2. The present invention mixes the raw materials through multi-stage stirring and vacuum degassing processes, thereby ensuring the uniformity and performance stability of the materials. The temperature and humidity control during the curing stage shortens the curing time of the materials and improves the production efficiency. Compared with the traditional preparation method, the present process can also recycle and reuse the scraps and unqualified products when cutting and inspecting the quality of the products. During curing, the discharged water is recycled through a filtering device, which not only reduces the production cost, but also effectively realizes green and environmentally friendly production.

[0016] 3. The present invention is pollution-free and waste-free during the production, construction and use processes, and the main materials can be recycled after the building is dismantled, which reduces waste, reduces construction waste, and greatly reduces production costs and waste disposal costs. In addition, due to its high efficiency, environmental protection and stable performance, it can be widely used in the walls of various buildings, and has promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart was prepared for the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0019] like Figure 1 As shown, an embodiment of the present invention provides a fireproof, ultra-low thermal conductivity exterior wall insulation material and a preparation process thereof, including an aerogel composite insulation board, wherein the aerogel composite insulation board is composed of the following raw materials in parts by weight: 400-450 parts of magnesium oxide, 300-350 parts of magnesium sulfate, 30-50 parts of non-woven fabrics, 2-5 parts of polystyrene particles, 40-60 parts of silica fume, 10-20 parts of sawdust, 3-6 parts of waterproofing agent, 10-15 parts of modifier and 2-5 parts of foaming agent.

[0020] Magnesium oxide, as the base material of the thermal insulation material, accounts for a relatively large proportion, and by mixing magnesium oxide and magnesium sulfate, magnesite material can be formed, which gives the board a certain toughness and fire resistance, and with the addition of non-woven fabrics, the tensile strength and durability of the board can be improved; among other raw materials, polystyrene particles are used to improve the thermal insulation performance of the material, while the filling of silica ash and sawdust can increase the density and thermal insulation of the material and improve its crack resistance; finally, the waterproofing agent is used to improve the waterproof performance of the material, the modifier is used to ensure the adhesion of the material during stirring and mixing, and the foaming agent can form a pore structure through stirring and mixing, thereby reducing the density of the material and improving the thermal insulation effect.

[0021] When preparing this thermal insulation material, the main and auxiliary materials used are all inorganic materials. This material can maintain stable performance between -60℃ and 900℃, is smokeless and non-toxic at high temperatures, has fire resistance of up to Class A, and has a thermal conductivity of 0.012V / (n·K), breaking through the technical barrier of high thermal conductivity of inorganic materials. Compared with traditional organic thermal insulation materials, this product has better thermal insulation performance. It is not only corrosion-resistant, acid- and alkali-resistant, weathering-resistant, and non-powdering, but also has a suitable water vapor permeability resistance, ensuring the breathability of the wall, reducing the damage of the water vapor in the wall to the enclosing structure and the exterior wall finish due to temperature changes, and improving the durability of the building.

[0022] The thermal insulation material also includes 1-2 parts of scraps and 0.3-0.5 parts of unqualified products. The scraps and unqualified products are crushed and used as a base material.

[0023] By mixing new and old materials, the quality of the thermal insulation material is ensured to remain unchanged while reducing the production cost.

[0024] This material is pollution-free and waste-free during the production, construction and use processes, and the main materials can be recycled after the building is dismantled, reducing waste, reducing construction waste, and greatly reducing production costs and waste disposal costs. In addition, due to its high efficiency, environmental protection and stable performance, it can be widely used in the walls of various buildings and has promotion significance.

[0025] The preparation process of the aerogel composite insulation board is as follows: Step 1, raw material preparation: put magnesium oxide, magnesium sulfate, non-woven fabric, polystyrene particles, silica fume and sawdust into the feeder one by one according to the formula ratio; Step 2: Mixing and stirring: feeding the mixture outputted from the feeder into a mixer, and adding 140-150 parts of water and a modifier, a waterproofing agent and a foaming agent in a formula ratio to stir and mix; Step 3, demoulding and curing: the evenly stirred slurry is introduced into the mold, and after the shaping, it enters the curing stage, and after the curing is completed, the demoulding operation is performed; Step 4: Cutting and sorting: The semi-finished products that have been cured are accurately cut according to the specifications using cutting equipment, and the scraps generated during the cutting process are collected; Step five, grading inspection, inspect the finished materials after cutting, test their density, thermal conductivity and fire performance indicators, collect unqualified products for backup, and pack and store qualified products.

[0026] The raw materials are mixed through multi-stage stirring and vacuum degassing processes to ensure the uniformity and performance stability of the materials. The temperature and humidity control during the curing stage shortens the curing time of the materials and improves production efficiency. Compared with traditional preparation methods, this process can also recycle and reuse scraps and unqualified products when cutting and inspecting the quality of the products. During curing, the discharged water is recycled through a filtration device, which not only reduces the production cost, but also effectively realizes green and environmentally friendly production.

[0027] Wherein, in the step 2, when performing the mixing operation, premix at a low speed for 1-2 minutes, then stir evenly at a high speed for 6-8 minutes, and finally vacuum degas for 2 minutes; Among them, 70% of water can be added first in the low-speed premixing stage, and then the remaining 30% can be gradually added to wet the raw materials more evenly.

[0028] Through low-speed premixing, the raw materials are initially mixed to prevent them from scattering. Then through high-speed mixing, it is ensured that the raw material particles are thoroughly dispersed and the slurry is uniform. Finally, vacuum degassing is used to remove bubbles and improve the density of the material.

[0029] The curing environment during the curing stage should be maintained at 20-25°C, the relative humidity should be controlled at 70%-90%, and the curing time should be 12-24 hours.

[0030] During the curing stage, the discharged water is recycled through the filtering device to save water. When the number of products is large, a wet steam environment can be used for curing at 40°C and a relative humidity of more than 90%. This environment can greatly accelerate the hydration reaction and shorten the curing time to 6-12 hours.

[0031] Among them, in the step 1, the scraps and unqualified products generated during cutting and inspection can be put into a crusher according to proportion and crushed, and after the crushing is completed, they are added to the feeder and mixed with new materials for use.

[0032] By crushing the scraps and unqualified products and mixing them with new materials, the loss of materials can be reduced and the cost can be lowered.

[0033] Among them, in the raw material preparation stage, sawdust, polystyrene particles, magnesium oxide and silica fume must first be screened to ensure that the purity and particle size of the materials meet the specified requirements.

[0034] In this step, the properties of the nonwoven fabric depend mainly on its thickness and fiber uniformity, so screening is not required.

[0035] Among them, in the grading inspection stage, the density and uniformity of the material are inspected by an X-ray density analyzer, and the thermal conductivity of the product is inspected by a laser thermal conductivity analyzer.

[0036] Through multiple inspection tests of classification, we can avoid the outflow of unqualified products, and the unqualified products can be used as base materials after being crushed.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fireproof, ultra-low thermal conductivity exterior wall insulation material, characterized by: The invention comprises an aerogel composite thermal insulation board, which is composed of the following raw materials in parts by weight: 400-450 parts of magnesium oxide, 300-350 parts of magnesium sulfate, 30-50 parts of non-woven fabrics, 2-5 parts of polystyrene particles, 40-60 parts of silica fume, 10-20 parts of sawdust, 3-6 parts of waterproofing agent, 10-15 parts of modifier and 2-5 parts of foaming agent.

2. The fireproof, ultra-low thermal conductivity exterior wall insulation material according to claim 1, characterized in that: The heat-insulating material also includes 1-2 parts of scraps and 0.3-0.5 parts of unqualified products. The scraps and unqualified products are crushed and used as a base material.

3. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 1, characterized in that: The preparation process of the aerogel composite insulation board is as follows: Step 1, raw material preparation: put magnesium oxide, magnesium sulfate, non-woven fabric, polystyrene particles, silica fume and sawdust into the feeder one by one according to the formula ratio; Step 2: Mixing and stirring: feeding the mixture outputted from the feeder into a mixer, and adding 140-150 parts of water and a modifier, a waterproofing agent and a foaming agent in a formula ratio to stir and mix; Step 3, demoulding and curing: the evenly stirred slurry is introduced into the mold, and after the shaping, it enters the curing stage, and after the curing is completed, the demoulding operation is performed; Step 4: Cutting and sorting: The semi-finished products that have been cured are accurately cut according to the specifications using cutting equipment, and the scraps generated during the cutting process are collected; Step five, grading inspection, inspect the finished materials after cutting, test their density, thermal conductivity and fire performance indicators, collect unqualified products for backup, and pack and store qualified products.

4. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 3, characterized in that: In the step 2, when performing the mixing operation, premix at a low speed for 1-2 minutes, then stir evenly at a high speed for 6-8 minutes, and finally vacuum degas for 2 minutes; In the low-speed premixing stage, 70% of the water can be added first, and then the remaining 30% can be gradually added.

5. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 3, characterized in that: The curing environment during the curing stage should be maintained at 20-25°C, the relative humidity should be controlled at 70%-90%, and the curing time should be 12-24 hours.

6. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 3, characterized in that: In the step 1, the scraps and unqualified products generated during cutting and inspection can be put into a crusher according to proportion and crushed, and after the crushing is completed, they are added to the feeder and mixed with new materials for use.

7. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 3, characterized in that: During the raw material preparation stage, sawdust, polystyrene particles, magnesium oxide and silica fume must first be screened to ensure that the purity and particle size of the materials meet the specified requirements.

8. The preparation process of a fireproof and ultra-low thermal conductivity exterior wall insulation material according to claim 3, characterized in that: During the grading inspection stage, the density and uniformity of the material are inspected by an X-ray density analyzer, and the thermal conductivity of the product is inspected by a laser thermal conductivity analyzer.

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