阅读说明：本技术 一种节能环保绿色建筑材料的制备装置及其制备方法 (Preparation device and preparation method of energy-saving environment-friendly building material ) 是由 李竞 于 2020-11-27 设计创作，主要内容包括：本发明公开一种节能环保绿色建筑材料的制备装置及其制备方法,该装置包括混合箱,混合箱下侧外壁固定安装夹套,夹套外壁固定安装支撑腿,混合箱内部固定安装混料器,混合箱顶部固定安装箱盖,箱盖顶部固定安装加料机构和进料管,混合箱底部固定安装出料管。本发明通过高压空气进行粉末送料,直接将粉末原料通入液体内部,通过回流管进行液体循环,提高了粉末原料和液体原料的缓和效果,通过本发明制备的节能环保绿色建筑材料具有固化时间断、表面硬度高、耐水性强和表面附着能力强的特点,同时具有较好的保温性能。(The invention discloses a preparation device and a preparation method of an energy-saving environment-friendly green building material. The energy-saving environment-friendly green building material prepared by the invention has the characteristics of discontinuity in curing, high surface hardness, strong water resistance and strong surface adhesion capability, and simultaneously has better heat insulation performance.)

1. The preparation device of the energy-saving environment-friendly green building material is characterized by comprising a mixing box (1), wherein a jacket (2) is fixedly arranged on the outer wall of the lower side of the mixing box (1), supporting legs (3) are fixedly arranged on the outer wall of the jacket (2), a mixer (4) is fixedly arranged in the mixing box (1), a box cover (5) is fixedly arranged at the top of the mixing box (1), a feeding mechanism (6) and a feeding pipe (7) are fixedly arranged at the top of the box cover (5), and a discharging pipe (8) is fixedly arranged at the bottom of the mixing box (1);

the mixer (4) comprises a vertically arranged return pipe (9), the outer wall of the lower end of the return pipe (9) is fixed with the inner wall of the mixing box (1) through a connecting rod (10), a rotating main shaft (11) penetrates through the return pipe (9), a stirring shaft (12) is fixedly installed on the connecting rod (10), a plurality of stirring rods (13) are fixedly installed on the surface of the stirring shaft (12), the upper end of the stirring shaft (12) is connected with the rotating main shaft (10) through a belt, the upper end of the rotating main shaft (10) penetrates through the box cover (5), and the upper end of the rotating main shaft (10) is meshed with an output shaft of a motor (14) through a gear;

reinforced mechanism (6) are including loading hopper (15), loading hopper (15) bottom fixed mounting filling tube (16), inside air feed pipe (17) of being equipped with of filling tube (16), air feed pipe (17) top is the terminating, air feed pipe (17) upper end lateral wall is equipped with the air inlet, the air inlet of air feed pipe (17) passes through the pipeline and is connected with the output of air pump (18), the lower extreme of air feed pipe (17) passes through rotary joint and is connected with rotation main shaft (10).

2. The apparatus for preparing energy-saving environment-friendly green building material according to claim 1, wherein a heating mechanism is arranged inside the jacket (2), and the heating mechanism is one of oil bath heating, water bath heating or electric heating mechanism.

3. The apparatus for preparing energy-saving environment-friendly building material as claimed in claim 1, wherein the upper and lower ends of the return pipe (8) are both open, two turbines (19) are fixedly installed on the surface of the rotating main shaft (11) inside the return pipe (8), the two turbines (19) are respectively arranged near the open ends of the two ends of the return pipe (8), and a baffle plate (20) is fixedly installed at the bottom end of the rotating main shaft (10).

4. The apparatus for preparing energy-saving environment-friendly building materials according to claim 1, wherein a tensioning mechanism (21) is fixedly installed at the bottom of the box cover (5), the tensioning mechanism (21) comprises a sliding groove (22) formed at the bottom of the box cover (5), the sliding groove (22) is radially arranged along the box cover (5), a sliding block (23) is arranged inside the sliding groove (22), one side of the sliding block (23) away from the axle center of the box cover (5) is connected with the inner wall of the sliding groove (22) through a spring (24), a tensioning wheel (25) is fixedly installed at the bottom of the sliding block (23), the tensioning wheel (25) is rotatably connected with the sliding block (23), and the tensioning wheel (25) is connected with the stirring shaft (12) and the rotating main shaft (11) through a belt.

5. The apparatus for preparing energy-saving environment-friendly building material as claimed in claim 1, wherein a blanking pipe (26) is arranged in the air supply pipe (17) in a penetrating manner, the upper end of the blanking pipe (26) is fixedly connected with the loading hopper (15), the lower end of the blanking pipe (26) extends into the rotating main shaft (11) in a penetrating manner, the rotating main shaft (11) is a hollow shaft, and a plurality of loading ports (27) are opened on the surface of the lower end of the rotating main shaft (11).

6. The preparation method of the energy-saving environment-friendly building material is characterized in that the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 45-60 parts of water-based nitrocellulose emulsion, 20-25 parts of modified hollow glass beads, 10-15 parts of pigment and filler, 0.5-2 parts of wetting agent, 3-5 parts of dispersing agent, 1-2 parts of flatting agent, 5-10 parts of thickening agent, 0.1-0.5 part of defoaming agent, 1-2 parts of silane coupling agent, 5-8 parts of film-forming assistant and 80-120 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a flatting agent and 1/2 defoaming agent into a mixing device, stirring at a low speed for 5-10min, then adding pigment and filler, stirring at a high speed for 20-30min, adding the water-based nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, and stirring at a low speed for 20-30min to obtain mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed for 1-2h, and then adding the thickening agent, and stirring at a low speed for 0.5-1h to obtain the energy-saving environment-friendly green building material.

7. The method for preparing energy-saving environment-friendly green building material as claimed in claim 6, wherein the pigment and filler is one or more of titanium dioxide, talcum powder, calcium carbonate, barium sulfate, mica powder and white carbon black, the wetting agent, the dispersant is polycarboxylate dispersant, the low-speed stirring speed is 300-2000 r/min, and the high-speed stirring speed is 1500-2000 r/min.

8. The method for preparing energy-saving environment-friendly green building material according to claim 6, wherein the method for preparing the aqueous nitrocellulose emulsion in step S1 comprises the following steps:

s101, adding isophorone diisocyanate and polyethylene glycol 400 into a reactor, heating to 65-70 ℃ in a water bath, slowly dropwise adding dibutyltin dilaurate, and reacting for 1-2h at a constant temperature to obtain a prepolymer A;

s102, firstly, butanone is used for completely dissolving nitrocellulose, then polyethylene glycol 2000, a digested cellulose solution and epoxy resin E-44 are added into a reactor, and the temperature is increased to 75-80 ℃ for reaction until the reaction is complete;

s103, after the reaction is completed, reducing the temperature to 50-60 ℃, uniformly and slowly adding distilled water, stirring at a high speed for 20-30min to obtain white emulsion, and removing the organic solvent butanone in the emulsion by a reduced pressure distillation method to obtain the water-based nitrocellulose emulsion.

9. The preparation method of the energy-saving environment-friendly green building material as claimed in claim 6, wherein the aqueous nitrocellulose emulsion comprises the following raw materials in parts by weight: 30-40 parts of digestive cellulose, 10-20 parts of isophorone diisocyanate, 10-15 parts of epoxy resin E-4410-15 parts, 5-10 parts of polyethylene glycol and 1-3 parts of dibutyltin dilaurate, wherein the digestive cellulose is cellucotton with the nitrogen content of 11.8-12.2%.

10. The method for preparing energy-saving environment-friendly green building material according to claim 6, wherein the method for preparing modified hollow glass beads in step S2 specifically comprises the following steps:

s201, adding absolute ethyl alcohol and butyl titanate into a reactor, then adding acetic acid as a chelating agent, and stirring and mixing at a high speed of 1500-2000r/min at room temperature to obtain a solution A;

s202, under the stirring condition, dropwise adding the ethanol solution into the solution A at a constant speed, and after titration is completed, standing and aging the mixed solution for 3-5 hours at room temperature to obtain light yellow transparent sol;

s203, adding hollow glass beads into the sol, stirring and mixing at a low speed of 500r/min for 300-₂Coated hollow glass bead powder.

Technical Field

The invention relates to the field of building materials, in particular to a preparation device and a preparation method of an energy-saving environment-friendly building material.

Background

The surface temperature of objects is overhigh due to solar radiation, the indoor and surrounding environment temperature can be increased due to the increase of the surface temperature of the building, the comfort level of the living environment is reduced, and the power consumption of the refrigeration tool is increased. In most developed countries, the energy consumed by equipment for cooling, such as electric fans, showers, air conditioners, and air conditioners, accounts for more than 20% of the total energy consumption. The traditional buildings need a large amount of energy for heating and cooling, and the heat-insulating coating with low heat conductivity coefficient and high reflectivity is an effective way for reducing the cold load and the energy consumption. Therefore, the building material for reducing and even preventing the temperature rise caused by strong solar radiation can effectively reduce the energy consumption consumed by cooling equipment, and achieve the purposes of saving energy and protecting the environment.

Improving the heat preservation and insulation performance of buildings is an important building energy-saving measure. The reflective heat-insulating coating is used as a novel building material, can play a role in decorating and beautifying buildings, has good heat-insulating and heat-preserving effects, and can reduce the heat-preserving or refrigerating energy consumption of the buildings. On one hand, the reflective heat insulation coating can reflect visible light and infrared light in sunlight, the visible light and the infrared light are main sources of heat, on the other hand, the blocking filler in the coating can block residual heat outside a building body, and the two effects act synergistically to achieve the effect of reflective heat insulation.

The existing preparation process of the reflective heat-insulating coating is similar to the preparation process of the common architectural coating, and has the characteristics of simple process, easily available raw materials and low production cost, but the existing coating preparation device is slow in dispersion in the raw material mixing process, and particularly is difficult to uniformly disperse in the inorganic filler and emulsion mixing process, and meanwhile, the reflective heat-insulating coating prepared by the existing coating preparation process has the problems of high content of Volatile Organic Compounds (VOC), poor coating adhesion force and poor heat-insulating effect.

Disclosure of Invention

In order to solve the defects mentioned in the background technology, the invention aims to provide a preparation device and a preparation method of an energy-saving environment-friendly green building material.

The purpose of the invention can be realized by the following technical scheme:

a preparation device of an energy-saving environment-friendly green building material comprises a mixing box, wherein a jacket is fixedly arranged on the outer wall of the lower side of the mixing box, supporting legs are fixedly arranged on the outer wall of the jacket, a mixer is fixedly arranged in the mixing box, a box cover is fixedly arranged at the top of the mixing box, a feeding mechanism and a feeding pipe are fixedly arranged at the top of the box cover, and a discharging pipe is fixedly arranged at the bottom of the mixing box;

the mixer comprises a vertically arranged return pipe, the outer wall of the lower end of the return pipe is fixed with the inner wall of the mixing box through a connecting rod, a rotating main shaft penetrates through the return pipe, a stirring shaft is fixedly installed on the connecting rod, a plurality of stirring rods are fixedly installed on the surface of the stirring shaft, the upper end of the stirring shaft is connected with the rotating main shaft through a belt, the upper end of the rotating main shaft penetrates through a box cover, and the upper end of the rotating main shaft is meshed with an output shaft;

further preferably, the feeding mechanism comprises a feeding hopper, a feeding pipe is fixedly mounted at the bottom of the feeding hopper, an air supply pipe is arranged inside the feeding pipe, the top end of the air supply pipe is sealed, an air inlet is formed in the side wall of the upper end of the air supply pipe, the air inlet of the air supply pipe is connected with the output end of the air pump through a pipeline, and the lower end of the air supply pipe is connected with the rotating main shaft through a rotating joint.

Further preferably, a heating mechanism is arranged inside the jacket, and the heating mechanism is one of oil bath heating, water bath heating or electric heating mechanism.

Further preferably, the upper end and the lower end of the return pipe are both open, two turbines are fixedly mounted on the surface of the rotating main shaft in the return pipe, the two turbines are respectively arranged at the positions close to the open positions of the two ends of the return pipe, and a baffle plate is fixedly mounted at the bottom end of the rotating main shaft.

Further preferably, the tensioning mechanism is fixedly installed at the bottom of the box cover and comprises a sliding groove formed in the bottom of the box cover, the sliding groove is radially formed in the box cover, a sliding block is arranged inside the sliding groove, one side, away from the axle center of the box cover, of the sliding block is connected with the inner wall of the sliding groove through a spring, a tensioning wheel is fixedly installed at the bottom of the sliding block and rotatably connected with the sliding block, and the tensioning wheel is connected with the stirring shaft and the rotating main shaft.

Further preferably, a blanking pipe penetrates through the inside of the air supply pipe, the upper end of the blanking pipe is fixedly connected with the charging hopper, the lower end of the blanking pipe penetrates through the inside of the rotating main shaft, the rotating main shaft is a hollow shaft, and a plurality of charging openings are formed in the surface of the lower end of the rotating main shaft.

The preparation method of the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 45-60 parts of water-based nitrocellulose emulsion, 20-25 parts of modified hollow glass beads, 10-15 parts of pigment and filler, 0.5-2 parts of wetting agent, 3-5 parts of dispersing agent, 1-2 parts of flatting agent, 5-10 parts of thickening agent, 0.1-0.5 part of defoaming agent, 1-2 parts of silane coupling agent, 5-8 parts of film-forming assistant and 80-120 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a flatting agent and 1/2 defoaming agent into a mixing device, stirring at a low speed for 5-10min, then adding pigment and filler, stirring at a high speed for 20-30min, adding the water-based nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, and stirring at a low speed for 20-30min to obtain mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed for 1-2h, and then adding the thickening agent, and stirring at a low speed for 0.5-1h to obtain the energy-saving environment-friendly green building material.

Further preferably, the pigment and filler is one or a combination of titanium dioxide, talcum powder, calcium carbonate, barium sulfate, mica powder and white carbon black, the wetting agent is a polycarboxylate dispersant, the low-speed stirring speed is 300-2000 r/min, and the high-speed stirring speed is 1500-2000 r/min.

Further preferably, the preparation method of the aqueous nitrocellulose emulsion in step S1 comprises the following steps:

s101, adding isophorone diisocyanate and polyethylene glycol 400 into a reactor, heating to 65-70 ℃ in a water bath, slowly dropwise adding dibutyltin dilaurate, and reacting for 1-2h at a constant temperature to obtain a prepolymer A;

s102, firstly, butanone is used for completely dissolving nitrocellulose, then polyethylene glycol 2000, a digested cellulose solution and epoxy resin E-44 are added into a reactor, and the temperature is increased to 75-80 ℃ for reaction until the reaction is complete;

s103, after the reaction is completed, reducing the temperature to 50-60 ℃, uniformly and slowly adding distilled water, stirring at a high speed for 20-30min to obtain white emulsion, and removing the organic solvent butanone in the emulsion by a reduced pressure distillation method to obtain the water-based nitrocellulose emulsion.

Further preferably, the aqueous nitrocellulose emulsion comprises the following raw materials in parts by weight: 30-40 parts of digestive cellulose, 10-20 parts of isophorone diisocyanate, 10-15 parts of epoxy resin E-4410-15 parts, 5-10 parts of polyethylene glycol and 1-3 parts of dibutyltin dilaurate, wherein the digestive cellulose is cellucotton with the nitrogen content of 11.8-12.2%.

Further preferably, the preparation method of the modified hollow glass bead in the step S2 specifically includes the following steps:

s201, adding absolute ethyl alcohol and butyl titanate into a reactor, then adding acetic acid as a chelating agent, and stirring and mixing at a high speed of 1500-2000r/min at room temperature to obtain a solution A;

s202, under the stirring condition, dropwise adding the ethanol solution into the solution A at a constant speed, and after titration is completed, standing and aging the mixed solution for 3-5 hours at room temperature to obtain light yellow transparent sol;

s203, adding hollow glass beads into the sol, stirring and mixing at a low speed of 500r/min for 300-₂Coated hollow glass bead powder.

The invention has the beneficial effects that:

1. the energy-saving environment-friendly green building material preparation device conveys high-pressure air into the air supply pipe through the air pump, the high-pressure air entrains raw material powder to enter liquid raw materials, liquid on the upper layer of the mixing box is conveyed downwards along the return pipe through the return pipe, bubbles and the powder raw materials which just enter the liquid raw materials are conveyed to the bottom of the mixing box and flow to the outer ring of the return pipe after being blocked by the baffle plate, the stirring rod rotates to disperse the powder raw materials when the bubbles drive the powder raw materials to move upwards, and the powder raw materials are uniformly dispersed in the liquid raw materials.

2. The preparation method of the energy-saving environment-friendly green building material introduces hydrophilic group ether bond, epoxy group and polyurethane chain segment on a nitrocellulose system, utilizes the hydrophilicity of the hydrophilic group to enable the system to have self-emulsifying capacity, prepares aqueous nitrocellulose emulsion, takes the aqueous nitrocellulose emulsion as a main film forming substance, and adds TiO₂The surface-modified hollow glass beads are used for preparing the water-based high-reflection environment-friendly energy-saving heat-insulating coating, and the coating has the characteristics of discontinuity in curing, high surface hardness, strong water resistance and strong surface adhesion capability, and has better heat-insulating property.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of an apparatus for producing an energy-saving environment-friendly building material according to the present invention;

FIG. 2 is a schematic sectional view of a mixing box of an apparatus for producing an energy-saving environment-friendly green building material according to the present invention;

FIG. 3 is a schematic structural diagram of a mixer of the apparatus for preparing energy-saving environment-friendly green building materials of the present invention;

FIG. 4 is a schematic structural diagram of a tensioning mechanism of the energy-saving environment-friendly green building material preparation device of the invention;

FIG. 5 is a schematic structural view of a charging pipe of the apparatus for preparing energy-saving environment-friendly building materials of the present invention;

fig. 6 is a schematic diagram of the heat insulation performance test results of the energy-saving environment-friendly green building materials prepared in embodiments 1 to 4 of the present invention.

In the figure:

1-mixing box, 2-jacket, 3-supporting leg, 4-mixer, 5-box cover, 6-feeding mechanism, 7-feeding pipe, 8-discharging pipe, 9-return pipe, 10-connecting rod, 11-rotating main shaft, 12-stirring shaft, 13-stirring rod, 14-motor, 15-feeding hopper, 16-feeding pipe, 17-air feeding pipe, 18-air pump, 19-turbine, 20-baffle plate, 21-tensioning mechanism, 22-chute, 23-sliding block, 24-spring, 25-tensioning wheel, 26-blanking pipe and 27-feeding opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

As shown in fig. 1-5, a device for preparing energy-saving environment-friendly green building materials comprises a mixing box 1, a jacket 2 is fixedly arranged on the outer wall of the lower side of the mixing box 1, supporting legs 3 are fixedly arranged on the outer wall of the jacket 2, a mixer 4 is fixedly arranged in the mixing box 1, a box cover 5 is fixedly arranged on the top of the mixing box 1, a feeding mechanism 6 and a feeding pipe 7 are fixedly arranged on the top of the box cover 5, and a discharging pipe 8 is fixedly arranged at the bottom of the mixing box 1;

the mixer 4 comprises a vertically arranged return pipe 9, the outer wall of the lower end of the return pipe 9 is fixed with the inner wall of the mixing box 1 through a connecting rod 10, a rotating main shaft 11 penetrates through the return pipe 9, a stirring shaft 12 is fixedly installed on the connecting rod 10, a plurality of stirring rods 13 are fixedly installed on the surface of the stirring shaft 12, the upper end of the stirring shaft 12 is connected with the rotating main shaft 10 through a belt, the upper end of the rotating main shaft 10 penetrates through the box cover 5, and the upper end of the rotating main shaft 10 is meshed with an output shaft of a motor;

the feeding mechanism 6 comprises a feeding hopper 15, a feeding pipe 16 is fixedly installed at the bottom of the feeding hopper 15, an air feeding pipe 17 is arranged inside the feeding pipe 16, the top end of the air feeding pipe 17 is sealed, an air inlet is formed in the side wall of the upper end of the air feeding pipe 17, the air inlet of the air feeding pipe 17 is connected with the output end of an air pump 18 through a pipeline, and the lower end of the air feeding pipe 17 is connected with the rotating main shaft 10 through a rotating joint.

The inside of the jacket 2 is provided with a heating mechanism which is one of oil bath heating, water bath heating or electric heating mechanisms.

The upper end and the lower end of the return pipe 8 are both open, two turbines 19 are fixedly arranged on the surface of the rotating main shaft 11 in the return pipe 8, the two turbines 19 are respectively arranged at the positions close to the open ends of the two ends of the return pipe 8, and a baffle plate 20 is fixedly arranged at the bottom end of the rotating main shaft 10.

The tensioning mechanism 21 is fixedly installed at the bottom of the box cover 5, the tensioning mechanism 21 comprises a sliding groove 22 formed in the bottom of the box cover 5, the sliding groove 22 is radially arranged along the box cover 5, a sliding block 23 is arranged inside the sliding groove 22, one side, far away from the axle center of the box cover 5, of the sliding block 23 is connected with the inner wall of the sliding groove 22 through a spring 24, a tensioning wheel 25 is fixedly installed at the bottom of the sliding block 23, the tensioning wheel 25 is rotatably connected with the sliding block 23, and the tensioning wheel 25 is connected with.

A blanking pipe 26 penetrates through the air supply pipe 17, the upper end of the blanking pipe 26 is fixedly connected with the charging hopper 15, the lower end of the blanking pipe 26 penetrates through the rotating main shaft 11, the rotating main shaft 11 is a hollow shaft, and a plurality of charging openings 27 are formed in the surface of the lower end of the rotating main shaft 11.

Principle of operation

When the device is used for preparing energy-saving environment-friendly green building materials, liquid raw materials are added into a mixing box 1 through a feeding pipe 7, solid or powder raw materials are added into a feeding hopper 14 after being ground, high-pressure air is conveyed into an air supply pipe 16 through an air pump 17, the powder raw materials in the feeding hopper 14 enter the interior of a rotating main shaft 11 through a blanking pipe 25, then enter the liquid raw materials through a feeding port 26 at the lower end of the rotating main shaft 11 under the wrapping of the high-pressure air, the rotating main shaft 11 is driven to rotate through a motor 14, liquid at the top of a return pipe 8 can be conveyed downwards along the return pipe 8 when a turbine 18 on the rotating main shaft 11 rotates, bubbles and the powder raw materials which just enter the liquid raw materials are conveyed to the bottom of the mixing box 1, flow to the outer ring of the return pipe 8 after being blocked by a baffle plate 19, and the stirring rod 13, so that the raw materials are uniformly dispersed in the liquid raw materials, and the dispersion speed of the liquid raw materials and the powder raw materials is greatly improved through the repeated reflux of the reflux pipe 8 and the stirring dispersion of the stirring rod 13.

Example 1

The preparation method of the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 46 parts of water-based nitrocellulose emulsion, 22 parts of modified hollow glass beads, 15 parts of pigment and filler, 0.5 part of wetting agent, 5 parts of dispersing agent, 1 part of flatting agent, 8 parts of thickening agent, 0.3 part of defoaming agent, 1.5 parts of silane coupling agent, 6 parts of film-forming assistant and 110 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a leveling agent and 1/2 defoaming agent into a mixing device, stirring at a low speed of 250r/min for 10min, then adding 1500r/min pigment and filler, stirring at a high speed of 25min, adding the aqueous nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, stirring at a low speed of 500r/min for 30min, and obtaining mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed of 300r/min for 2 hours, and then adding the thickening agent at a low speed of 500r/min, stirring for 1 hour, thereby obtaining the energy-saving environment-friendly green building material.

The preparation method of the aqueous nitrocellulose emulsion in the step S1 includes the following steps:

s101, adding 15 parts of isophorone diisocyanate and 400 parts of polyethylene glycol and 2 parts of polyethylene glycol into a reactor, heating to 70 ℃ in a water bath, slowly dropwise adding 2 parts of dibutyltin dilaurate, and reacting for 1-2h at a constant temperature to obtain a prepolymer A;

s102, firstly, using butanone to completely dissolve 35 parts of nitrocellulose, then adding 20005 parts of polyethylene glycol, a digestive cellulose solution and E-4412 parts of epoxy resin into a reactor, and heating to 80 ℃ for reaction until the reaction is complete;

s103, after the reaction is completed, reducing the temperature to 55 ℃, uniformly and slowly adding distilled water, stirring at a high speed for 25min to obtain white emulsion, and removing the butanone serving as the organic solvent in the emulsion by a reduced pressure distillation method to obtain the aqueous nitrocellulose emulsion.

The preparation method of the modified hollow glass bead in the step S2 specifically includes the following steps:

s201, adding absolute ethyl alcohol and butyl titanate into a reactor, then adding acetic acid as a chelating agent, and stirring and mixing at a high speed of 2000r/min at room temperature to obtain a solution A;

s202, under the stirring condition, dropwise adding the ethanol solution into the solution A at a constant speed, and after titration is completed, standing and aging the mixed solution for 4 hours at room temperature to obtain light yellow transparent sol;

s203, adding hollow glass beads into the sol, stirring and mixing at a low speed of 400r/min to obtain a solution B, standing, separating, drying and calcining at a high temperature to obtain TiO₂Coated hollow glass bead powder.

Example 2

The preparation method of the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 60 parts of water-based nitrocellulose emulsion, 25 parts of modified hollow glass beads, 10 parts of pigment and filler, 1.2 parts of wetting agent, 4 parts of dispersing agent, 2 parts of flatting agent, 8 parts of thickening agent, 0.5 part of defoaming agent, 1 part of silane coupling agent, 6 parts of film-forming assistant and 120 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a leveling agent and a 1/2 defoaming agent into a mixing device, stirring at a low speed of 500r/min for 10min, then adding 1800r/min of pigment and filler, stirring at a high speed of 25min, adding the aqueous nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, stirring at a low speed of 500r/min for 25min, and obtaining mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed of 500r/min for 1.5h, and then adding the thickening agent at a low speed of 400r/min, stirring for 1h, thereby obtaining the energy-saving environment-friendly green building material.

The preparation method of the aqueous nitrocellulose emulsion in step S1 and the preparation method of the modified hollow glass beads in step S2 are the same as in example 1.

Example 3

The preparation method of the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 45 parts of water-based nitrocellulose emulsion, 20 parts of modified hollow glass beads, 12 parts of pigment and filler, 1 part of wetting agent, 3 parts of dispersing agent, 1.5 parts of flatting agent, 10 parts of thickening agent, 0.2 part of defoaming agent, 2 parts of silane coupling agent, 5 parts of film-forming assistant and 85 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a leveling agent and 1/2 defoaming agent into a mixing device, stirring at a low speed of 400r/min for 5min, then adding a pigment and a filler, stirring at a high speed of 2000r/min for 20min, adding the aqueous nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, stirring at a low speed of 400r/min for 20min, and obtaining mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed of 400r/min for 2 hours, and then adding the thickening agent at a low speed of 400r/min, stirring for 1 hour, thereby obtaining the energy-saving environment-friendly green building material.

The preparation method of the aqueous nitrocellulose emulsion in step S1 and the preparation method of the modified hollow glass beads in step S2 are the same as in example 1.

Example 4

The preparation method of the energy-saving environment-friendly building material comprises the following raw materials in parts by weight: 55 parts of water-based nitrocellulose emulsion, 24 parts of modified hollow glass beads, 10 parts of pigment and filler, 1.6 parts of wetting agent, 4.5 parts of dispersing agent, 1 part of flatting agent, 6 parts of thickening agent, 1.5 parts of defoaming agent, 1.2 parts of silane coupling agent, 8 parts of film-forming assistant and 105 parts of water, wherein the preparation method specifically comprises the following steps:

s1, preparing a water-based nitrocellulose emulsion by using digestive cellulose, isophorone diisocyanate, epoxy resin E-44, polyethylene glycol and dibutyltin dilaurate as raw materials and adopting a self-emulsifying method;

s2, preparing modified hollow glass microspheres by using butyl titanate, acetic acid and hollow glass microspheres as raw materials and adopting a sol-gel method;

s3, adding water, a wetting agent, a dispersing agent, a leveling agent and 1/2 of defoaming agent into a mixing device, stirring at a low speed of 300r/min for 10min, then adding 1500r/min of pigment and filler, stirring at a high speed of 30min, adding the aqueous nitrocellulose emulsion, the film-forming assistant, the silane coupling agent and the rest of defoaming agent into the mixing device, stirring at a low speed of 300r/min for 20min, and obtaining mixed slurry;

s4, slowly adding the modified hollow glass beads into the mixed slurry, stirring at a low speed of 300r/min for 2 hours, and then adding the thickening agent at a low speed of 300r/min, stirring for 1 hour, thereby obtaining the energy-saving environment-friendly green building material.

The preparation method of the aqueous nitrocellulose emulsion in step S1 and the preparation method of the modified hollow glass beads in step S2 are the same as in example 1.

Comparative example 1

The preparation method comprises the following steps of changing the water-based nitrocellulose emulsion in the energy-saving environment-friendly green building material raw material in the embodiment 1 into water-based acrylic emulsion, changing the modified hollow glass microspheres into unmodified hollow glass microspheres, and keeping other components unchanged:

s1, adding water, a wetting agent, a dispersing agent, a leveling agent and 1/2 defoaming agent into a mixing device, stirring at a low speed of 250r/min for 10min, then adding 1500r/min pigment and filler, stirring at a high speed of 25min, adding the water-based acrylic emulsion, the film-forming assistant, the silane coupling agent and the rest defoaming agent into the mixing device, stirring at a low speed of 500r/min for 30min, and obtaining mixed slurry;

s2, slowly adding the hollow glass beads into the mixed slurry, stirring at a low speed of 300r/min for 2 hours, and then adding the thickening agent at a low speed of 500r/min, stirring for 1 hour, thus obtaining the heat-insulating coating.

Performance detection

1. Detecting items

(1) Film drying time test

The test was carried out according to standard GB1728-79, in which the tack free time test of the film is carried out by the finger touch method and the tack free time of the film is carried out by the cotton ball press method.

(2) Hardness test of coating film

According to the standard GB/T6739, the surface of the coating film is scratched by a pencil with known hardness mark, and the hardness mark marked by the pencil capable of leaving marks on the surface of the coating film is used for representing the measured hardness of the coating film.

(3) Water resistance test of coating film

Adding appropriate amount of deionized water into a container to keep water temperature at 40 + -1 deg.C, soaking 2/3 pieces of each pattern in a tank, taking out the pattern after 240 hr, removing surface visible water with absorbent paper or absorbent cotton, observing and recording whether the coating film has phenomena of falling off, wrinkling, discoloration, light loss, air bubble, etc. Determined according to the standard GB/T1733-1993.

(4) Adhesion test of coating film

The test is carried out according to standard GB9286-88, 100 squares with the specification of 10 multiplied by 10 are drawn out by a grid drawing method through a grid cutter with the space between teeth of 1mm, a coating film drawn by the grid cutter is removed, the surface of the grid is covered by an adhesive tape and is quickly drawn out, the condition that the coating film is drawn out and falls off is observed, recorded and calculated, and the adhesive force is graded.

(5) Heat insulation performance detection

According to the manufacturing method in JG/T235-2008 'architectural reflective thermal insulation coating', a simple coating comprehensive thermal insulation performance measuring device is manufactured, a heating light source is a heating lamp with 275W power, the distance from the position of a coating is 25cm, the position of a temperature measuring room except for the position where a sample to be measured is placed at the upper end can be regarded as thermal insulation, and a thermometer shows the temperature in the temperature measuring room. The instrument simulates indoor temperature change conditions corresponding to different outer wall coating films under the irradiation of sunlight. In the experiment, the room temperature is controlled at 25 ℃, which is equivalent to the constant ambient temperature around a building, the blank plate is equivalent to a bare outer wall, the sample to be tested is equivalent to the outer wall coated with the heat insulation coating, and the temperature test is carried out in a temperature measuring room simulating the indoor temperature change. During the experiment, the temperature measuring chamber is sealed by a sample to be measured or a blank plate, the power supply of a heating lamp is switched on, the temperature of the temperature measuring chamber is recorded every 3min until the temperature is stable and unchanged, and a temperature rise curve is drawn for comparing the heat insulation performance.

2. Test data and results

(1) The energy-saving environment-friendly green building materials prepared in examples 1 to 4 and the heat-insulating coating prepared in comparative example 1 were subjected to the above-described performance tests, and the obtained data are shown in table 1 and fig. 6:

TABLE 1 Performance test results of energy-saving and environment-friendly building materials

It can be seen from table 1 that the energy-saving environment-friendly green building materials prepared in examples 1 to 4 of the present invention have significantly improved comprehensive properties compared to thermal insulation materials prepared using aqueous acrylic emulsion and unmodified hollow glass beads, and have the characteristics of discontinuity in curing, high surface hardness, strong water resistance and strong surface adhesion.

As can be seen from FIG. 6, the energy-saving environment-friendly green building materials prepared in the embodiments 1-4 of the invention have good heat preservation performance, the maximum heat insulation temperature difference of the sample plate can reach 8.7 ℃, and the heat insulation effect is obvious.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.