WO2017157079A1

WO2017157079A1 - Phase-change particle aggregate-composite assembly-type lightweight wall and preparation method

Info

Publication number: WO2017157079A1
Application number: PCT/CN2016/112867
Authority: WO
Inventors: 陶祥令; 朱科企; 刘辉
Original assignee: 江苏建筑职业技术学院
Priority date: 2016-03-16
Filing date: 2016-12-29
Publication date: 2017-09-21
Also published as: CN105649234A

Abstract

A phase-change particle aggregate-composite assembly-type lightweight wall, comprising: a foamed concrete panel (4), wherein wall panel ribs (2) are arranged on the foamed concrete panel (4), semicircular grooves (9) are arranged between the adjacent wall panel ribs (2), the grooves (9) are arranged in the length direction of the assembly-type wall (1), a phase-change particle mixture (3) is arranged in the grooves (9), the phase-change particle mixture (3) comprises phase-change porous expanded graphite particles (6) and a lightweight aggregate mixture (7), and the wall panel ribs (2) are covered with a polyurethane face layer (5) thereon. A preparation method of a phase-change particle aggregate-composite assembly-type lightweight wall. The assembly-type lightweight wall has a simple structure, is convenient to use, can absorb and store heat energy in the daytime, and the phase-change materials release energy, insulate outdoor cold air and keep the indoor temperature when the temperature is lowered at night, so that indoor thermal environment conditioning is realized.

Description

Assembled lightweight wall composite with phase change particle aggregate and preparation method thereof

Technical field

The invention mainly relates to the technical field of the thermal insulation wall used for the construction of the assembled wall of the building engineering, in particular to the assembled lightweight wall and the preparation method of the phase change granular aggregate composite.

Background technique

At present, the building envelope structure usually adopts traditional organic thermal insulation materials to meet the building thermal protection requirements for the thermal resistance of the envelope structure. Although these thermal insulation materials have lower thermal conductivity values, which can effectively increase the thermal resistance of the enclosure structure, most of them have safety hazards, and the wall has a limited service life and a low heat capacity value.

Nowadays, the more advanced method of domestic construction industry is to use phase change materials as additives, mix them into concrete for pouring, or apply phase change materials to hollow block walls reasonably. Phase change materials have obvious phase change. The heat storage effect can absorb or release a large amount of latent heat, but its own temperature does not change much, which can make the indoor temperature fluctuations a little smooth, thereby improving the indoor comfort and reducing the energy consumption of the air conditioning system. However, the lightweight phase change material insulation wall is still in advanced technology in China, and there is a big gap in application. According to Article 11 of the State Council's "Several Opinions of the Central Committee of the Communist Party of China and the State Council on Further Strengthening the Management of Urban Planning and Construction": Development of new construction methods, and strive to use 30 years or so to make the proportion of prefabricated buildings to 30% of new buildings. Opinions, China's construction field of assembly-type building structure has a large development and application space, assembly-type lightweight phase change insulation wall can effectively shorten the construction period, improve efficiency and enhance the overall quality of the building, improve the heat capacity value of the building's external wall, Its application improves energy efficiency, reduces energy consumption, and can significantly reduce temperature fluctuations and improve environmental comfort. Therefore, how to design and prepare an inexpensive assembled lightweight wall is a person skilled in the art. A technical problem that needs to be solved.

Summary of the invention

In order to solve the deficiencies of the prior art, the present invention, in combination with the prior art, provides a fabricated wall and a preparation method for phase-change granular aggregate composite, which is simple in structure and convenient to use during daytime. It can absorb heat energy storage, and the temperature at night decreases. The phase change material releases energy to isolate the outdoor cold air to maintain the indoor temperature, thereby realizing the adjustment of the indoor thermal environment.

In order to achieve the above object, the technical solution of the present invention is as follows:

A fabricated lightweight wall comprising a phase change particle aggregate composite, comprising a fabricated wall, the fabricated wall comprising a foamed concrete panel, the foamed concrete panel being provided with a wall rib, adjacent A semi-circular groove is disposed between the wall ribs, the groove is disposed along the length direction of the assembled wall, and the phase change particle mixture is disposed in the groove, and the phase change particle mixture includes a phase The porous expanded graphite particles and the lightweight aggregate mixture are covered with a polyurethane surface layer above the wall ribs.

The two sides of the assembled wall are respectively provided with a convex opening and a concave opening, the convex opening and the concave opening are arranged along the length direction of the assembled wall, and the convex opening and the concave opening can cooperate with each other to form a tongue-and-groove .

The convex and concave openings are at least two, and the plurality of convex and concave openings are arranged in sequence on the side of the assembled wall.

The foamed concrete panel and the wall ribs are all mixed and cast by waste concrete powder, lightweight aggregate and cement.

A method for preparing a fabricated lightweight wall composite of phase change granular aggregate comprises the following steps:

1) Using waste concrete powder, lightweight aggregate and cement as the main material, 2%~4% early strength agent as auxiliary material, mixing and pouring to form foamed concrete panel and wall rib, and moisturizing for 3 days under normal temperature conditions In the above, a plurality of semicircular grooves are reserved during the preparation and setting process of the wall ribs;

2) Preparation of phase change porous expanded graphite particles:

A. The graphite is immersed in a potassium hydroxide solution having a concentration of 3.5 to 4.6 mol/L at room temperature, magnetically stirred for about 12 hours or more, and the mixture is allowed to stand for more than 26 hours, and the excess potassium hydroxide soaking solution is removed by suction filtration. The treated graphite is filled with argon gas, calcined at a temperature of 800 ° C for 25 hours, and washed with hydrochloric acid and distilled water having a concentration of 3.6% for 3 times to obtain a porous graphite matrix;

B. The phase change particle base adopts a mixture of butyl stearate and a porous graphite matrix. The mass ratio of the two is 65-80% of liquid butyl stearate and 20~35% of porous graphite matrix. 30 minutes in a 90 ° C incubator, removed to room temperature after removal;

C. Using phase change material (PCM) capsule encapsulation technology to make particles with a particle size of less than 14 mm, and store them for use;

3) mixing the phase-change porous expanded graphite particles and the lightweight aggregate mixture to form a phase-change granular mixture poured into the semi-circular groove of the wall rib of the wall, and the surface is leveled and cured at room temperature for more than 48 hours;

4) After the phase change particle mixture is solidified, the surface of the wall is sprayed with polyurethane foam insulation material to form a polyurethane surface layer, which is integrated into a body.

During the preparation and setting process of the foamed concrete panel and the wall rib, the mutually cooperating convex and concave openings are reserved on both sides of the foamed concrete panel.

The beneficial effects of the invention:

The assembled lightweight wall designed by the invention adopts phase-change granular aggregate as a filling material, so that the wall body can absorb heat energy storage during the day, and the temperature decreases at night, and the phase change material releases energy to isolate the outdoor cold air to maintain the indoor temperature, thereby realizing indoor The function of adjusting the thermal environment; the structure of the lightweight wall is simple, the preparation is convenient, the assembly is quick and easy, and the material used for the wall is low in cost, which can greatly reduce energy consumption.

DRAWINGS

Figure 1 is a schematic view showing the overall structure of a fabricated lightweight wall;

Figure 2 is a schematic view showing the structure of a foamed concrete panel;

Figure 3 is a cross-sectional view of a cross section of a fabricated lightweight wall;

Figure 4 is a schematic view showing an application example of a fabricated lightweight wall.

The figures are shown in the drawings: 1. assembled lightweight wall; 2, wall rib; 3, phase change particle mixture; 4, foamed concrete panel; 5, polyurethane type surface layer; Porous expanded graphite particles; 7, lightweight aggregate mixture; 8, tongue; 9, groove; 81, concave mouth; 82, convex mouth.

detailed description

The invention will be further described with reference to the drawings and specific embodiments. It is to be understood that the examples are not intended to limit the scope of the invention. In addition, it should be understood that various changes and modifications may be made by those skilled in the art in the form of the present invention.

As shown in FIGS. 1 to 4, a phase-change granular aggregate composite assembled lightweight wall comprises an assembled wall 1 comprising a foamed concrete panel 4, said foaming The concrete panel 4 is provided with wall ribs 2, and semi-circular grooves 9 are provided between adjacent wall ribs 2, and the grooves 9 are arranged along the longitudinal direction of the assembled wall 1 in the groove 9. The phase change particle mixture 3 is provided, and the phase change particle mixture 3 comprises a phase change porous expanded graphite particle 6 and a lightweight aggregate mixture 7 , and the wall plate rib 2 is covered with a polyurethane type surface layer 5 The two sides of the assembled wall 1 are respectively provided with a convex opening 82 and a concave opening 81. The convex opening 82 and the concave opening 81 are arranged along the longitudinal direction of the assembled wall 1, the convex opening 82 and the concave The cavities 81 can cooperate with each other to form the tongue and groove 8; the convex cavities 82 and the recessed cavities 81 are at least two, and the plurality of convex cavities 82 and the recessed cavities 81 are sequentially arranged on the side of the assembled wall 1 .

The assembled wall 1 of the present invention is rectangular, and the bottom plate is a foamed concrete panel 4, and the intermediate filler is Phase change particle mixture 3, the upper layer of the heat insulating material is a polyurethane foam type heat insulating material, and the phase change particle mixture 3 is poured into the groove 9 in the wall rib 2, and the design of the groove 9 is convenient on the one hand. The forming of the foamed concrete panel 4 and the wall rib 2 is convenient, and the pouring of the phase change granular mixture 3 is facilitated. After the phase change granular mixture 3 is poured, the groove 9 is filled, and the surface is sprayed with polyurethane. Foam insulation material. Since the phase change material inside the wall can absorb the heat energy storage during the day, the temperature at the night decreases, and the phase change material releases the energy to isolate the outdoor cold air to maintain the indoor temperature. Therefore, the assembled wall can adjust the indoor thermal environment. The invention is provided with a plurality of convex mortises 82 and concave vents 81 on both sides of the foamed concrete panel 4, so that the assembled wall bodies 1 can be conveniently connected, and the joints are tightly coupled to prevent penetration. Seam.

The thickness of the assembled lightweight wall 1 is 190mm, and the wall rib 2 and the foamed concrete panel 4 are all made of waste concrete powder, lightweight aggregate and cement, and 2%-4% early strength agent is Excipients, mixing and setting, moisturizing and curing for more than 3 days under normal temperature conditions, the groove 9 reserved for the wall rib 2 preparation process is a semicircle with a diameter of 110 mm, and the narrowest part of the adjacent wall rib 2 is 30mm.

The method for preparing the phase change porous expanded graphite particles 6 of the present invention is as follows:

The graphite is immersed in a potassium hydroxide solution having a concentration of 3.5 to 4.6 mol/L at room temperature, magnetically stirred for about 12 hours or more, and the mixture is allowed to stand for more than 26 hours, and the excess potassium hydroxide soaking solution is removed by suction filtration. The treated graphite was filled with argon gas, calcined at a temperature of 800 ° C for 25 hours, and washed with hydrochloric acid and distilled water having a concentration of 3.6% for 3 times to obtain a porous graphite substrate;

The prepared phase-change porous expanded graphite particles 6 and the lightweight aggregate mixture 7 are mixed and poured in the semi-circular groove 9 in the wall rib 2, and the surface is leveled and cured at room temperature for more than 48 hours;

After the phase change particle mixture 3 is solidified and formed on the surface, the polyurethane foam type heat insulating material is sprayed on the surface to form a polyurethane type surface layer 5, which is integrated and shaped into one body.

The assembled wall prepared by the above method has better quality, can improve energy utilization rate, reduce energy consumption, and can also greatly reduce temperature fluctuation and improve environmental comfort.

Claims

A fabricated lightweight wall composite with a phase change particle aggregate, comprising a fabricated wall (1), characterized in that the fabricated wall (1) comprises a foamed concrete panel (4), the hair The foam concrete slab (4) is provided with wall ribs (2), and semi-circular grooves (9) are arranged between adjacent wall ribs (2), and the grooves (9) are assembled The wall (1) is disposed in the longitudinal direction, and the groove (9) is provided with a phase change particle mixture (3), and the phase change particle mixture (3) comprises phase change porous expanded graphite particles (6) and light The aggregate aggregate (7) and the wall rib (2) are covered with a polyurethane surface layer (5).
The prefabricated wall aggregate composite assembly wall according to claim 1, wherein the assembled wall (1) is provided with a convex opening (82) and a concave opening on each of the two sides (1). 81), the convex burr (82) and the concave vent (81) are arranged along the length direction of the assembled wall (1), and the convex rib (82) and the concave vent (81) can cooperate with each other to form a tongue ( 8).
The assembled lightweight wall of the phase change particle aggregate composite according to claim 2, wherein the convex rib (82) and the concave vent (81) are at least two or more The convex ribs (82) and the female vents (81) are arranged in sequence on the side of the fabricated wall (1).
A fabricated lightweight wall according to claim 1, wherein the foamed concrete panel (4) and the wall rib (2) are made of waste concrete powder. Lightweight aggregate and cement are mixed and cast for stereotypes.
A method for preparing a fabricated lightweight wall composite with phase change particle aggregates, comprising: the following steps:

1) Using waste concrete powder, lightweight aggregate and cement as the main material, 2%~4% early strength agent as auxiliary material, mixing and pouring to form foamed concrete panel (4) and wall rib (2), normal temperature Under the condition of moisturizing for more than 3 days, a number of semi-circular grooves (9) are reserved during the preparation process of the wall ribs (2);

2) Preparation of phase change porous expanded graphite particles (6):

A. The graphite is immersed in a potassium hydroxide solution having a concentration of 3.5 to 4.6 mol/L at room temperature, and magnetically stirred. Mix for about 12 hours, the mixture is allowed to stand for more than 26 hours, and the excess potassium hydroxide soaking solution is removed by suction filtration. The treated graphite is filled with argon gas and calcined at a temperature of 800 ° C for 25 hours. The concentration is 3.6. Washing with hydrochloric acid and distilled water 3 times to obtain a porous graphite matrix;

B. The phase change particle base adopts a mixture of butyl stearate and a porous graphite matrix. The mass ratio of the two is 65-80% of liquid butyl stearate and 20~35% of porous graphite matrix. 30 minutes in a 90 ° C incubator, removed to room temperature after removal;

C. Using phase change material (PCM) capsule encapsulation technology to make particles with a particle size of less than 14 mm, and store them for use;

3) mixing the phase-change porous expanded graphite particles (6) with the lightweight aggregate mixture (7) to form a phase-change particle mixture (3) poured into the semi-circular groove of the wall rib (2) In the tank (9), the surface is leveled and cured at room temperature for more than 48 hours;

4) After the phase change particle mixture (3) is solidified, the surface of the wall is sprayed with polyurethane foam insulation material to form a polyurethane surface layer (5), which is integrated into a body.
The method for preparing a fabricated lightweight wall according to claim 5, characterized in that: the foamed concrete panel (4) and the wall rib (2) are prepared during the setting process, The convex concrete slabs (82) and the concave vents (81) are respectively arranged on both sides of the foamed concrete panel (4).