WO2018171118A1

WO2018171118A1 - Composite thermal insulation material having antibacterial effect, and preparation method therefor

Info

Publication number: WO2018171118A1
Application number: PCT/CN2017/098526
Authority: WO
Inventors: 陈红嘉
Original assignee: 苏州顶裕节能设备有限公司
Priority date: 2017-03-24
Filing date: 2017-08-22
Publication date: 2018-09-27
Also published as: CN107082601A

Abstract

Disclosed is a composite thermal insulation material having an antibacterial effect, and a preparation method therefor. The composite thermal insulation material is made from the following raw materials in parts by weight: 25-40 parts of silicate cement, 10-20 parts of hydrophobic perlite, 5-12 parts of heavy calcium, 7-13 parts of lignocellulose, 9-15 parts of sepiolite, 5-10 parts of kaolin, 3-9 parts of desulfurized gypsum, 5-10 parts of polyurethane, 1-4 parts of ammonium dihydrogen phosphate, 2-3 parts of zinc oxide, 1-4 parts of sodium fluoride, 1-3 parts of lithium citrate, 2-5 parts of hollow glass microbeads, 3-6 parts of sodium lignosulfonate, 1-3 parts of sodium silicate, 2-4 parts of magnesium oxide, 1-4 parts of n-octanol, 1-2 parts of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, 1-2 parts of N-[3-dimethylaminopropyl]-9-octadeceneamide, 3-8 parts of a water reducer, 1-4 parts of a foaming agent, and 2-6 parts of a stabilizer.

Description

Composite thermal insulation material with antibacterial effect and preparation method thereof

Technical field

The invention relates to the field of materials, in particular to a composite thermal insulation material with antibacterial effect and a preparation method thereof.

Background technique

With the advent of the 21st century, under the guidance of the scientific concept of development, the construction field has clarified the need for a new type of industrialization that is resource-saving and environmentally friendly. At present, China has initially established a building energy-saving design standard system with the goal of energy-saving 50, and some regions have implemented higher energy-saving standards. For the building energy conservation, the most critical link is the use and promotion of new energy-saving building materials. At the same time, through the use of new building materials, building energy efficiency will also achieve significant results. After decades of development, China's building materials industry has become an important raw material and product industry with complete categories, large scale, complete system, strong product supporting ability and obvious international competitiveness, occupying a pivotal position in the international market. With the widespread promotion of energy-efficient buildings, the society has put forward new requirements for the building materials industry. The market demand for energy-saving, consumption-reducing and environmental protection indicators for building materials is also increasing. New energy-saving building materials conform to the development of energy-saving and environmental protection situations. Become a hot product. New energy-saving building materials products are gradually increasing in the market, such as green environmental protection coatings, energy-saving and water-saving sanitary ware products, environmentally-friendly stone materials, and environmentally-friendly exterior wall tiles. Energy-saving and environmentally friendly products are promising in the broad market of building materials industry. The invention combines the concept of environmental protection and antibacterial into the energy-saving thermal insulation material, and develops an insulation material with good heat preservation effect, environmental protection and non-toxicity, and antibacterial and mildew resistance to meet the needs of the market and the industry.

Summary of the invention

In order to solve the above technical problems, the present invention provides a composite thermal insulation material having an antibacterial effect and a preparation method thereof, and the composite thermal insulation material having the antibacterial effect obtained by combining specific materials and the corresponding production process has good heat preservation effect. It is environmentally friendly and non-toxic, has antibacterial and anti-mildew effects, can meet the requirements of the industry, and has a good application prospect.

The object of the present invention can be achieved by the following technical solutions:

The composite thermal insulation material with antibacterial effect is made of the following raw materials by weight: 25-40 parts of Portland cement, 10-20 parts of hydrophobic perlite, 5-12 parts of heavy calcium, 7-13 of lignin fiber Parts, 9-15 parts of sepiolite, 5-10 parts of kaolin, 3-9 parts of desulfurized gypsum, 5-10 parts of polyurethane, 1-4 parts of ammonium dihydrogen phosphate, 2-3 parts of zinc oxide, sodium fluoride 1- 4 parts, 1-3 parts of lithium niobate, 2-5 parts of hollow glass microspheres, 3-6 parts of sodium lignosulfonate, 1-3 parts of sodium silicate, 2-4 parts of magnesium oxide, n-octanol 1 -4 parts, 1-2 parts of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide 1-2 Parts, water reducing agent 3-8 parts, foaming agent 1-4 parts, stabilizer 2-6 parts.

Preferably, the water reducing agent is a sulfonated melamine formaldehyde resin, a naphthalene sulfonate, an aromatic sulfamate polymerization. One or more of the polymers, aliphatic hydroxy sulfonate polymers.

Preferably, the foaming agent is any one of azodicarbonamide, isopropyl azodicarboxylate, diazoaminobenzene, and azobisisobutyronitrile.

Preferably, the stabilizer is selected from any one or more of tribasic lead sulfate, dibasic lead stearate, zinc stearate, and calcium stearate.

The preparation method of the composite thermal insulation material with antibacterial effect comprises the following steps:

(1) weighing each raw material by weight;

(2) Putting Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride and stabilizer into high-speed mixer The mixture is stirred at room temperature, the stirring speed is 3000-3500 rpm, and after being uniformly stirred, it is injected into a high-temperature internal mixer, heated to 340-390 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, water reducing agent and foaming agent are mixed and added to the foaming furnace, heated to 62-78 ° C, and filled with an inert gas for foaming reaction. The reaction time is 25 minutes;

(4) sifting the foaming mixture of step (3) by pressure, defoaming and removing solid particles;

(5) The high temperature reactant of the step (2) and the foamed filtrate of the step (4) are simultaneously injected into a powerful agitator, heated to 55-60 ° C, the stirring speed is 1500 rpm, the power is 200-250 KW, and the stirring time is 35-40 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product.

Preferably, the inert gas is carbon dioxide gas.

Preferably, the pressure is 5-10 MPa.

Preferably, the sieved aperture is from 100 to 150 mesh.

Preferably, the twin screw extruder has a screw temperature of 220-260 ° C and a screw speed of 250-300 rpm.

Compared with the prior art, the invention has the following beneficial effects:

(1) The composite thermal insulation material with antibacterial effect of the invention is made of Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurized gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide Sodium fluoride is the main component by adding lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3- Nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, water reducing agent, foaming agent, stabilizer, supplemented by high-speed mixing, heating and mixing, mixed foaming The process of pressure filtration, strong stirring, extrusion molding, etc., makes the prepared composite thermal insulation material with antibacterial effect, has good heat preservation effect, is environmentally friendly and non-toxic, and has The antibacterial and anti-mildew effect can meet the requirements of the industry and has a good application prospect.

(2) The composite thermal insulation material with antibacterial effect of the invention is cheap, simple in process, suitable for large-scale industrial application, and has strong practicability.

detailed description

The technical solution of the invention will be described in detail below with reference to specific embodiments.

Example 1

(1) Weigh 25 parts of Portland cement, 10 parts of hydrophobic perlite, 5 parts of heavy calcium, 7 parts of lignin fiber, 9 parts of sepiolite, 5 parts of kaolin, 3 parts of desulfurized gypsum, and polyurethane 5 by weight. Parts, 1 part of ammonium dihydrogen phosphate, 2 parts of zinc oxide, 1 part of sodium fluoride, 1 part of lithium niobate, 2 parts of hollow glass microspheres, 3 parts of sodium lignosulfonate, 1 part of sodium silicate, magnesium oxide 2 parts, 1 part of n-octanol, 1 part of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide 1 part, 3 parts of sulfonated melamine formaldehyde resin, 1 part of azodicarbonamide, and 2 parts of lead tribasic lead sulfate;

(2) Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride, tribasic lead sulfate The high-speed mixer is stirred at room temperature, the stirring speed is 3000 rpm, and after being uniformly stirred, it is injected into a high-temperature internal mixer, heated to 340 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, sulfonated melamine formaldehyde resin, azodicarbonamide are mixed into a foaming furnace, heated to 62 ° C, and filled with carbon dioxide gas for foaming. Reaction, reaction time is 25 minutes;

(4) The foaming mixture of the step (3) is subjected to pressure filtration, sieved, defoamed and removed, and the pressure is 5 MPa, and the sieve diameter is 100 mesh;

(5) The high temperature reactant of the step (2) and the foamed filtrate of the step (4) are simultaneously injected into a powerful agitator, heated to 55 ° C, the stirring speed is 1500 rpm, the power is 200 KW, and the stirring time is 35 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product. The screw temperature is 220 ° C, and the screw rotation speed is 250 rpm.

The performance test results of the prepared composite thermal insulation material with antibacterial effect are shown in Table 1.

Example 2

(1) Weigh 30 parts of Portland cement, 13 parts of hydrophobic perlite, 8 parts of heavy calcium, 9 parts of lignin fiber, 11 parts of sepiolite, 7 parts of kaolin, 5 parts of desulfurized gypsum, and polyurethane 7 by weight. Parts, 2 parts of ammonium dihydrogen phosphate, 2 parts of zinc oxide, 2 parts of sodium fluoride, 1 part of lithium niobate, 3 parts of hollow glass microspheres, 4 parts of sodium lignosulfonate, 2 parts of sodium silicate, 3 parts of magnesium oxide, 2 parts of n-octanol, 1 part of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, 1 part of N-[3-dimethylaminopropyl]-9-octadecanamide, 4 parts of naphthalenesulfonate 2 parts of isopropyl azodicarboxylate and 3 parts of lead dibasic stearate;

(2) Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurized gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride, dibasic stearic acid The mixture is placed in a high-speed mixer for stirring at room temperature, the stirring speed is 3200 rpm, and after being uniformly stirred, it is injected into a high-temperature internal mixer, heated to 360 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, naphthalenesulfonate, isopropyl azodicarboxylate are mixed into a foaming furnace, heated to 67 ° C, and charged with carbon dioxide gas. Bubble reaction, reaction time is 25 minutes;

(4) The foaming mixture of the step (3) is subjected to pressure filtration, sieved, defoamed and removed, and the pressure is 7 MPa, and the sieve diameter is 120 mesh;

(5) The high temperature reactant of the step (2) and the foamed filtrate of the step (4) are simultaneously injected into a strong agitator, heated to 57 ° C, the stirring speed is 1500 rpm, the power is 220 KW, and the stirring time is 37 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product. The screw temperature is 230 ° C, and the screw rotation speed is 270 rpm.

Example 3

(1) Weigh 35 parts of Portland cement, 17 parts of hydrophobic perlite, 10 parts of heavy calcium, 11 parts of lignin fiber, 13 parts of sepiolite, 9 parts of kaolin, 8 parts of desulfurized gypsum, and polyurethane 9 by weight. Parts, 3 parts of ammonium dihydrogen phosphate, 3 parts of zinc oxide, 3 parts of sodium fluoride, 2 parts of lithium niobate, 4 parts of hollow glass microspheres, 5 parts of sodium lignosulfonate, 2 parts of sodium silicate, magnesium oxide 3 parts, 3 parts of n-octanol, 2 parts of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide 2 parts, 6 parts of aromatic sulfamate polymer, 3 parts of diazoaminobenzene, and 5 parts of zinc stearate;

(2) Bringing Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride, zinc stearate into high speed The mixture was stirred at room temperature at a stirring speed of 3400 rpm, and after being uniformly stirred, it was poured into a high-temperature internal mixer, heated to 375 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, aromatic sulfamate polymer, diazoaminobenzene are mixed into a foaming furnace, heated to 75 ° C, and charged with carbon dioxide gas. The foaming reaction is carried out, and the reaction time is 25 minutes;

(4) The foaming mixture of the step (3) is subjected to pressure filtration, sieved, defoamed and removed, and the pressure is 9 MPa, and the sieve diameter is 130 mesh;

(5) The high temperature reactant of the step (2) and the foamed filtrate of the step (4) are simultaneously injected into a powerful agitator, heated to 59 ° C, the stirring speed is 1500 rpm, the power is 240 KW, and the stirring time is 38 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product. The screw temperature is 250 ° C, and the screw rotation speed is 285 rpm.

Example 4

(1) Weigh 40 parts of Portland cement, 20 parts of hydrophobic perlite, 12 parts of heavy calcium, 13 parts of lignin fiber, 15 parts of sepiolite, 10 parts of kaolin, 9 parts of desulfurized gypsum, and polyurethane 10 according to the weight. Parts, 4 parts of ammonium dihydrogen phosphate, 3 parts of zinc oxide, 4 parts of sodium fluoride, 3 parts of lithium niobate, 5 parts of hollow glass microspheres, 6 parts of sodium lignosulfonate, 3 parts of sodium silicate, magnesium oxide 4 parts, 4 parts of n-octanol, 2 parts of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide 2 parts, 8 parts of aliphatic hydroxy sulfonate polymer, 4 parts of azobisisobutyronitrile, and 6 parts of calcium stearate;

(2) Bringing Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride, calcium stearate into high speed The mixture was stirred at room temperature at a stirring speed of 3,500 rpm, and after being uniformly stirred, it was poured into a high-temperature internal mixer, heated to 390 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, aliphatic hydroxy sulfonate polymer, azobisisobutyronitrile mixed into a foaming furnace, heated to 78 ° C, charged with carbon dioxide The gas is subjected to a foaming reaction, and the reaction time is 25 minutes;

(4) The foaming mixture of the step (3) is subjected to pressure filtration, sieved, defoamed and removed, and the pressure is 10 MPa, and the sieve diameter is 150 mesh;

(5) The high temperature reactant of the step (2) and the foaming filtrate of the step (4) are simultaneously injected into a strong agitator, heated to 60 ° C, the stirring speed is 1500 rpm, the power is 250 KW, and the stirring time is 40 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product, the screw temperature is 260 ° C, and the screw rotation speed is 300 rpm.

Comparative example 1

(1) Weigh 25 parts of Portland cement, 10 parts of hydrophobic perlite, 5 parts of heavy calcium, 7 parts of lignin fiber, 9 parts of sepiolite, 5 parts of kaolin, 3 parts of desulfurized gypsum, and polyurethane 5 by weight. Parts, 1 part ammonium dihydrogen phosphate, 1 part of sodium fluoride, 1 part of lithium niobate, 2 parts of hollow glass microspheres, 3 parts of sodium lignosulfonate, 1 part of sodium silicate, 1 part of n-octanol, N 1-[4-(methylamino)-3-nitrophenyl]diethanolamine 1 part, N-[3-dimethylaminopropyl]-9-octadecosamide 1 part, sulfonated melamine formaldehyde resin 3 parts , 1 part of azodicarbonamide, 2 parts of lead tribasic sulfate;

(2) Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, sodium fluoride, tribasic lead sulfate into high-speed mixer The mixture is stirred at room temperature, the stirring speed is 3000 rpm, and after being uniformly stirred, it is injected into a high-temperature internal mixer, heated to 340 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microbeads, sodium lignosulfonate, sodium silicate, n-octanol, N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N -[3-Dimethylaminopropyl]-9-octadecenamide, sulfonated melamine formaldehyde resin, azodicarbonamide mixed into a foaming furnace, heated to 62 ° C, charged with carbon dioxide gas for foaming reaction, reaction The time is 25 minutes;

Comparative example 2

(1) Weigh 40 parts of Portland cement, 20 parts of hydrophobic perlite, 12 parts of heavy calcium, 13 parts of lignin fiber, 15 parts of sepiolite, 10 parts of kaolin, 9 parts of desulfurized gypsum, and phosphoric acid. 4 parts of ammonium hydrogen hydride, 3 parts of zinc oxide, 4 parts of sodium fluoride, 3 parts of lithium niobate, 5 parts of hollow glass microspheres, 6 parts of sodium lignosulfonate, 3 parts of sodium silicate, 4 parts of magnesium oxide, positive 4 parts of octanol, 2 parts of N-[3-dimethylaminopropyl]-9-octadecenamide, 8 parts of aliphatic hydroxy sulfonate polymer, 4 parts of azobisisobutyronitrile, calcium stearate 6 servings;

(2) Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride, calcium stearate into a high-speed mixer The mixture was stirred at room temperature at a stirring speed of 3,500 rpm, and after being uniformly stirred, it was poured into a high-temperature internal mixer, heated to 390 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microbeads, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[3-dimethylaminopropyl]-9-octadecenamide, The aliphatic hydroxy sulfonate polymer and azobisisobutane cyanide are mixed into a foaming furnace, heated to 78 ° C, and charged with carbon dioxide gas for foaming reaction, and the reaction time is 25 minutes;

The composite insulating materials having antibacterial effects prepared in Examples 1-4 and Comparative Examples 1-2 were subjected to several performance tests of thermal conductivity, tensile strength, antibacterial rate and mildew resistance.

Table 1

The composite thermal insulation material with antibacterial effect of the invention is made of Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurized gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, and fluorination. Sodium is the main component by adding lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrobenzene Diethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, water reducing agent, foaming agent, stabilizer, supplemented by high-speed mixing, heating, mixing, foaming, pressurization Filtration, strong stirring, extrusion molding and other processes make the prepared composite thermal insulation material with antibacterial effect, which has good heat preservation effect, environmental protection and non-toxicity, antibacterial and anti-mildew effect, can meet the requirements of the industry, and has better Application prospects. Composite protection with antibacterial effect of the invention The material of the warm material is cheap, the process is simple, and it is suitable for large-scale industrial application, and has strong practicability.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, The same is included in the scope of patent protection of the present invention.

Claims

A composite thermal insulation material with antibacterial effect, which is characterized by being made of the following raw materials by weight: 25-40 parts of Portland cement, 10-20 parts of hydrophobic perlite, 5-12 parts of heavy calcium, lignin 7-13 parts of fiber, 9-15 parts of sepiolite, 5-10 parts of kaolin, 3-9 parts of desulfurized gypsum, 5-10 parts of polyurethane, 1-4 parts of ammonium dihydrogen phosphate, 2-3 parts of zinc oxide, fluorine 1-4 parts of sodium, 1-3 parts of lithium niobate, 2-5 parts of hollow glass microspheres, 3-6 parts of sodium lignosulfonate, 1-3 parts of sodium silicate, 2-4 parts of magnesium oxide, 1-4 parts of n-octanol, 1-2 parts of N-[4-(methylamino)-3-nitrophenyl]diethanolamine, N-[3-dimethylaminopropyl]-9-octadecene 1-2 parts of amide, 3-8 parts of water reducing agent, 1-4 parts of foaming agent, and 2-6 parts of stabilizer.
The composite thermal insulation material with antibacterial effect according to claim 1, wherein the water reducing agent is a sulfonated melamine formaldehyde resin, a naphthalene sulfonate, an aromatic sulfamate polymer, an aliphatic hydroxysulfonic acid. One or more of the salt polymers.
The composite thermal insulation material with antibacterial effect according to claim 1, wherein the foaming agent is azodicarbonamide, isopropyl azodicarboxylate, diazoaminobenzene, azobisisobutylate. Any of cyanide.
The composite thermal insulation material with antibacterial effect according to claim 1, wherein the stabilizer is selected from the group consisting of tribasic lead sulfate, dibasic lead stearate, zinc stearate, and calcium stearate. Any one or several.
The method for preparing a composite thermal insulation material having an antibacterial effect according to any one of claims 1 to 4, characterized in that it comprises the following steps:

(1) weighing each raw material by weight;

(2) Putting Portland cement, hydrophobic perlite, heavy calcium, lignin fiber, sepiolite, kaolin, desulfurization gypsum, polyurethane, ammonium dihydrogen phosphate, zinc oxide, sodium fluoride and stabilizer into high-speed mixer The mixture is stirred at room temperature, the stirring speed is 3000-3500 rpm, and after being uniformly stirred, it is injected into a high-temperature internal mixer, heated to 340-390 ° C, heated for 45 minutes, and then naturally cooled to room temperature;

(3) Lithium niobate, hollow glass microspheres, sodium lignosulfonate, sodium silicate, magnesium oxide, n-octanol, N-[4-(methylamino)-3-nitrophenyl] Ethanolamine, N-[3-dimethylaminopropyl]-9-octadecenamide, water reducing agent and foaming agent are mixed and added to the foaming furnace, heated to 62-78 ° C, and filled with an inert gas for foaming reaction. The reaction time is 25 minutes;

(4) sifting the foaming mixture of step (3) by pressure, defoaming and removing solid particles;

(5) The high temperature reactant of the step (2) and the foamed filtrate of the step (4) are simultaneously injected into a powerful agitator, heated to 55-60 ° C, the stirring speed is 1500 rpm, the power is 200-250 KW, and the stirring time is 35-40 minutes;

(6) The stirring mixture of the step (5) is injected into a twin-screw extruder, melted, extruded, and molded into a sheet to obtain a finished product.
The method for preparing a composite thermal insulation material having an antibacterial effect according to claim 5, wherein in the step (3), the inert gas is carbon dioxide gas.
The method for preparing a composite thermal insulation material having an antibacterial effect according to claim 5, wherein in the step (4), the pressure is 5-10 MPa.
The method for preparing a composite thermal insulation material having an antibacterial effect according to claim 5, wherein in the step (4), the sieved pore size is 100-150 mesh.
The method for preparing a composite thermal insulation material with antibacterial effect according to claim 5, wherein in the step (6), the screw temperature of the twin-screw extruder is 220-260 ° C, and the screw rotation speed is 250-300 rpm. /minute.