阅读说明：本技术 一种免抽芯高性能复合保温墙板及其制备工艺 (Core-drawing-free high-performance composite heat-insulation wallboard and preparation process thereof ) 是由 高育欣 程宝军 杨文� 肖啸 王军 涂玉林 麻鹏飞 康升荣 李爽 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种免抽芯高性能复合保温墙板及其制备工艺,免抽芯高性能复合保温墙板包括芯体和超高性能混凝土壳体；所述芯体为泡沫混凝土,抗压强度≥0.8MPa,体积吸水率≤10％；所述超高性能混凝土壳体为纤维增强水泥基复合材料。本发明采用免抽芯工艺制备复合保温墙板,所制得的墙板厚度在100～200mm且面密度在80～120kg/m<Sup>3</Sup>基础上,实现了抗弯荷载≥15倍、耐火极限≥3小时、传热系数≤0.75W/(m<Sup>2</Sup>·K)、空气声计权隔声量≥50dB；同时泡沫混凝土芯体与超高性能混凝土壳体一体成型,可有效避免保温材料与墙板外壳粘结不牢或脱开的问题。(The invention discloses a core-pulling-free high-performance composite heat-insulation wallboard and a preparation process thereof, wherein the core-pulling-free high-performance composite heat-insulation wallboard comprises a core body and an ultrahigh-performance concrete shell; the core body is made of foam concrete, the compressive strength is more than or equal to 0.8MPa, and the volume water absorption rate is less than or equal to 10%; the ultra-high performance concrete shell is made of fiber reinforced cement-based composite materials. The invention adopts the core-pulling-free process to prepare the composite heat-insulating wallboard, and the thickness of the prepared wallboard is 100-200 mm, and the surface density is 80-120 kg/m 3 On the basis, the bending resistance load is more than or equal to 15 times, the fire resistance limit is more than or equal to 3 hours, and the heat transfer coefficient is less than or equal to 0.75W/(m) 2 K), the air acoustics weighting sound insulation quantity is more than or equal to 50 dB; meanwhile, the foam concrete core and the ultrahigh-performance concrete shell are integrally formed, so that the problem that the heat-insulating material is not firmly bonded or separated from the wallboard shell can be effectively solved.)

1. The core-pulling-free high-performance composite heat-insulation wallboard is characterized by comprising a core body and an ultrahigh-performance concrete shell; the core body is made of foam concrete, the compressive strength is more than or equal to 0.8MPa, and the volume water absorption rate is less than or equal to 10%; the ultra-high performance concrete shell is made of fiber reinforced cement-based composite materials.

2. The core-pulling-free high-performance composite thermal insulation wallboard of claim 1, wherein the foam concrete thermal conductivity is less than or equal to 0.05W/(m.K), and the dry density is less than or equal to 250kg/m³The compressive strength of the fiber reinforced cement-based composite material is more than or equal to 80MPa, and the flexural strength is more than or equal to 20 MPa.

3. The core-pulling-free high-performance composite heat-insulation wallboard of claim 1, wherein the foam concrete comprises the following components in percentage by mass: 100-145 parts of cement, 10-30 parts of mineral admixture, 9-16 parts of foaming agent, 5-16 parts of aerogel powder, 40-60 parts of water and 1-3 parts of water reducing agent.

4. The core-pulling-free high-performance composite heat-insulation wallboard of claim 1, wherein the fiber reinforced cement-based composite material comprises the following components in percentage by mass: 1000-1350 parts of cement, 100-250 parts of mineral admixture, 18-35 parts of organic fiber, 275-480 parts of quartz sand, 0.2-0.8 part of water-retaining agent, 7-27 parts of water-reducing agent and 300-550 parts of water.

5. The core-pulling-free high-performance composite thermal insulation wallboard of claim 3, wherein the foaming agent comprises a foaming component, a foam stabilizing component and a hydrophobic component; the foaming component is one of a rosin resin foaming agent, a synthetic foaming agent, a protein active matter type foaming agent and a compound foaming agent; the foam stabilizing component is one of methyl cellulose, ethyl cellulose and hydroxypropyl methyl cellulose; the hydrophobic component is one of sodium methyl silanol, calcium stearate and polypropylene emulsion; the density of the aerogel powder is less than or equal to 0.08g/cm ³The thermal conductivity coefficient is less than or equal to 0.020W/(m.K).

6. The core-pulling-free high-performance composite heat-insulation wallboard of claim 4 is characterized in that the organic fiber is one of polypropylene fiber, polyvinyl alcohol fiber, polyethylene fiber and polyacrylonitrile fiber, the length-diameter ratio is 30:1 to 50:1, the elastic modulus is larger than or equal to 2.0GPa, the water reducing rate of the water reducing agent is larger than or equal to 20%, and the solid content is 10% -50%.

7. The core-pulling-free high-performance composite heat-insulation wallboard of claim 1, wherein the volume of the core body in the core-pulling-free high-performance composite heat-insulation wallboard is more than or equal to 60%.

8. The core-pulling-free high-performance composite thermal insulation wallboard of any one of claims 1-7, wherein the preparation process comprises the following steps:

(1) preparation of the core

Weighing the components according to the mass parts of the raw materials, adding the components into a stirrer, and uniformly stirring to obtain slurry for later use; foaming the foaming agent to obtain stable and uniform foam; adding foam into the slurry, uniformly stirring to obtain foam concrete slurry, pouring the foam concrete slurry into a core body mould, and removing the mould after hardening to obtain a foam concrete core body;

(2) assembly of core-pulling-free high-performance composite heat-insulation wallboard die

Putting the core body prepared in the step (1) into a wallboard forming die, and sealing the periphery and two ends of the wallboard forming die;

(3) preparation of fiber reinforced cement-based composite material slurry

Weighing the components according to the mass parts of the raw materials, adding the components into a stirrer, and uniformly stirring to obtain fiber reinforced cement-based composite material slurry;

(4) preparation of core-pulling-free high-performance composite heat-insulation wallboard

And (3) injecting the fiber reinforced cement-based composite material slurry into the core-pulling-free high-performance composite heat-insulation wallboard mould by adopting a grouting process, and removing the mould after the slurry is hardened to obtain the core-pulling-free high-performance composite heat-insulation wallboard.

9. The preparation process of the core-pulling-free high-performance composite heat-insulation wallboard according to claim 8, wherein the core body mold is made of one of PVC and steel.

10. The preparation process of the core-pulling-free high-performance composite heat-insulation wallboard according to claim 8, wherein the core body is fixed through a preformed hole in the side dies at two sides, wherein the size of the preformed hole is slightly larger than the size of the cross section of the core body, and a bottom die and a side die are assembled to obtain the core-pulling-free high-performance composite heat-insulation wallboard die.

Technical Field

The invention relates to a core-pulling-free high-performance composite heat-insulation wallboard and a preparation process thereof, belonging to the technical field of preparation of building materials.

Background

The use of wallboard in the building field can practice thrift the cost of labor, improves the efficiency of construction, reduces the comprehensive cost of construction cost of wall body, and the cost of accomplishing the work can reduce about 5 ~ 10% than the brick wall building. With the development of economy and the acceleration of urbanization process, the heat insulation performance, the fire resistance and the like of house buildings attract the wide attention of people, and the nation vigorously promotes the development of novel composite heat insulation wallboards which are light in weight, high in strength, energy-saving and easy to industrially produce.

At present, when a composite thermal insulation wallboard is prepared, a core mould is firstly arranged in a mould, prepared slurry is poured into the mould, after the slurry is finally solidified, the core mould is pulled out, and the hollow wallboard is prepared after demoulding; and then pouring a heat-insulating material into the prepared hollow wallboard to prepare the composite heat-insulating wallboard. The process for producing the composite heat-insulating wallboard by adopting the process of core-pulling and pouring the heat-insulating material has the problems of complex process, low production efficiency, unstable product quality and the like.

In order to solve the problems, patent CN102505798B discloses a composite thermal insulation wallboard and a preparation method thereof, and patent CN104478354B discloses a cement foaming thermal insulation core material, an inorganic composite thermal insulation board, a manufacturing method and a mold. However, the composite thermal insulation wallboard in the invention has the problems of small volume proportion of the thermal insulation core, poor thermal insulation performance, infirm bonding between the thermal insulation core and the shell, heavy weight of the composite thermal insulation wallboard and the like. Therefore, a novel core-pulling-free high-performance composite heat-insulation wallboard and a preparation process thereof need to be developed to solve the problems and prepare a light composite heat-insulation wallboard with excellent mechanical property, heat-insulation performance, fire resistance and sound insulation performance.

Disclosure of Invention

The invention mainly overcomes the defects in the prior art and provides a core-drawing-free high-performance composite heat-insulation wallboard and a preparation process thereof. The core-drawing-free high-performance composite heat-insulation wallboard prepared by the method has the advantages of small surface density, excellent heat-insulation performance, good mechanical property and durability and the like; meanwhile, the problems of complex process, low production efficiency, unstable product quality and the like of the existing composite heat-insulating wallboard are solved.

The technical scheme provided by the invention for solving the technical problems is as follows: a core-pulling-free high-performance composite heat-insulation wallboard comprises a core body and an ultrahigh-performance concrete shell; the core body is made of foam concrete, the compressive strength is more than or equal to 0.8MPa, and the volume water absorption rate is less than or equal to 10%; the ultra-high performance concrete shell is made of fiber reinforced cement-based composite materials.

The further technical proposal is that the heat conductivity coefficient of the foam concrete is less than or equal to 0.05W/(m.K), and the dry density is less than or equal to 250kg/m³The compressive strength of the fiber reinforced cement-based composite material is more than or equal to 80MPa, and the flexural strength is more than or equal to 20 MPa.

The further technical scheme is that the foam concrete comprises the following components in percentage by mass: 100-145 parts of cement, 10-30 parts of mineral admixture, 9-16 parts of foaming agent, 5-16 parts of aerogel powder, 40-60 parts of water and 1-3 parts of water reducing agent.

The further technical scheme is that the fiber reinforced cement-based composite material comprises the following components in percentage by mass: 1000-1350 parts of cement, 100-250 parts of mineral admixture, 18-35 parts of organic fiber, 275-480 parts of quartz sand, 0.2-0.8 part of water-retaining agent, 7-27 parts of water-reducing agent and 300-550 parts of water.

The further technical proposal is that the foaming agent comprises a foaming component, a foam stabilizing component and a hydrophobic component; the foaming component is one of a rosin resin foaming agent, a synthetic foaming agent, a protein active matter type foaming agent and a compound foaming agent; the foam stabilizing component is one of methyl cellulose, ethyl cellulose and hydroxypropyl methyl cellulose; the hydrophobic component is one of sodium methyl silanol, calcium stearate and polypropylene emulsion.

The further technical proposal is that the density of the aerogel powder is less than or equal to 0.08g/cm³The thermal conductivity coefficient is less than or equal to 0.020W/(m.K).

The further technical scheme is that the organic fiber is one of polypropylene fiber, polyvinyl alcohol fiber, polyethylene fiber and polyacrylonitrile fiber, the length-diameter ratio is 30:1 to 50:1, and the elastic modulus is more than or equal to 2.0 GPa.

The further technical scheme is that the water reducing rate of the water reducing agent is more than or equal to 20%, and the solid content is 10-50%.

The further technical scheme is that the volume of the core body in the core-drawing-free high-performance composite heat-insulation wallboard is more than or equal to 60%.

The further technical scheme is that the preparation process of the core-pulling-free high-performance composite heat-insulation wallboard comprises the following steps:

(1) preparation of the core

Weighing the components according to the mass parts of the raw materials, adding the components into a stirrer, and uniformly stirring to obtain slurry for later use; foaming the foaming agent to obtain stable and uniform foam; adding foam into the slurry, uniformly stirring to obtain foam concrete slurry, pouring the foam concrete slurry into a core body mould, and removing the mould after hardening to obtain a foam concrete core body;

(2) assembly of core-pulling-free high-performance composite heat-insulation wallboard die

Putting the core body prepared in the step (1) into a wallboard forming die, and sealing the periphery and two ends of the wallboard forming die;

(3) Preparation of fiber reinforced cement-based composite material slurry

Weighing the components according to the mass parts of the raw materials, adding the components into a stirrer, and uniformly stirring to obtain fiber reinforced cement-based composite material slurry;

(4) preparation of core-pulling-free high-performance composite heat-insulation wallboard

And (3) injecting the fiber reinforced cement-based composite material slurry into the core-pulling-free high-performance composite heat-insulation wallboard mould by adopting a grouting process, and removing the mould after the slurry is hardened to obtain the core-pulling-free high-performance composite heat-insulation wallboard.

The further technical scheme is that the core body die is made of one of PVC and steel.

The further technical scheme is that the core body is fixed through preformed holes in side dies on two sides, the size of the preformed holes is slightly larger than the size of the section of the core body, and a bottom die and side dies are assembled to obtain the core-pulling-free high-performance composite heat-insulation wallboard die.

Compared with the prior art, the invention has the following advantages:

(1) the dry density of the foam concrete is less than or equal to 250kg/m³The volume water absorption rate is less than or equal to 10 percent, the heat conductivity coefficient is less than or equal to 0.050W/(m.K), and the volume proportion of the core body is more than or equal to 60 percent, so that the core-pulling-free high-performance composite heat-insulation wallboard has excellent heat-insulation, waterproof, sound-insulation and fireproof performances;

(2) the compressive strength of the fiber reinforced cement-based composite material is more than or equal to 80MPa, the flexural strength is more than or equal to 20MPa, and the fiber reinforced cement-based composite material is used as an ultrahigh-performance concrete shell to enable the core-pulling-free high-performance composite heat-insulation wallboard to have excellent mechanical properties;

(3) The core body and the ultra-high performance concrete shell are integrally formed, so that the problem that the heat insulation material is not firmly bonded or separated from the wallboard shell can be effectively avoided;

(4) the core-pulling-free high-performance composite heat-insulation wallboard realizes excellent mechanical, heat-insulation, fireproof, waterproof and sound-insulation performances on the basis of light weight;

(5) the core-pulling-free preparation process is adopted to replace the traditional core-pulling process to prepare the core-pulling-free high-performance composite heat-insulation wallboard, and the problems of complex process, low production efficiency, unstable product quality and the like in the existing core-pulling process for preparing the composite heat-insulation wallboard are solved.

Drawings

FIG. 1 is a schematic view of a rib-free structure of a core-pulling-free high-performance composite heat-insulating wall panel;

FIG. 2 is a schematic view of a full rib structure of a core-pulling-free high-performance composite heat-insulating wall panel;

FIG. 3 is a schematic view of a core-pulling-free high-performance composite heat-insulating wall panel half-rib structure;

fig. 1-3 illustrate the construction of the core and the ultra high performance concrete shell in the present invention, but are not limited to these three ways. It should be noted that fig. 1-3 are only schematic diagrams for explaining the present invention, and the shapes, appearances and sizes of the core and the ultra-high performance concrete shell are not limited thereto.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.