A modified EPS particle, a preparation method thereof, and an application thereof in an ultra-light ceramsite composite wallboard

Abstract

The present invention discloses a modified EPS particle, its preparation method and application in an ultra-light ceramsite composite wallboard. The method includes: S1. Fumigating the EPS particles with a monohydric alcohol-water azeotropic steam; S2. Adding nano-metakaolin powder to the fumigated EPS particles for microwave treatment; S3. Spraying a triethanolamine solution on the surface of the EPS particles; S4. Drying the sprayed EPS particles to obtain the modified EPS particles. The present invention fumigates the EPS particles with the azeotropic steam of monohydric alcohol and water, and then mixes the nano-metakaolin with the EPS particles for microwave treatment. On the one hand, part of the nano-metakaolin can penetrate into the interior of the EPS to play a role in weight gain; on the other hand, the incorporation of kaolin can improve the effect of microwave treatment; moreover, kaolin contains a large number of polar groups, which can effectively improve the interfacial state between the EPS particles and the gel material, so that the strength of the concrete incorporated with the modified EPS particles is relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of inorganic building materials, and specifically relates to a modified EPS particle, a preparation method thereof, and an application in an ultra-light ceramsite composite wallboard. Background Art

[0002] Foamed concrete is a lightweight and porous cement-based material made from cement-based gelling materials, aggregates, admixtures, additives, foaming agents or blowing agents, water, etc. using physical or chemical foaming processes. Foamed concrete with a dry density ≤ 300 kg / m 3 is ultra-light foamed concrete. As an inorganic thermal insulation material containing a large number of closed pores, foamed concrete has the advantages of light weight, thermal insulation, sound insulation, fire resistance, low cost, etc. However, due to its large number of pore structures, it has deficiencies such as low strength, easy cracking, high water absorption, and large dry shrinkage.

[0003] Polystyrene foam plastic particles (hereinafter referred to as EPS particles) have the characteristics of ultra-low density, good thermal insulation, and good energy absorption. When incorporated into concrete, EPS foam concrete can be made. EPS foam concrete can be applied to building thermal insulation projects through in-situ construction or made into products such as thermal insulation boards, blocks, and prefabricated components.

[0004] However, the density of EPS particles is much smaller than that of cement. After EPS particles are incorporated into cement, it is difficult for EPS particles to disperse evenly in cement. Moreover, the surface of EPS particles is hydrophobic. It is a non-polar lightweight organic polymer material, while the cement paste is a polar inorganic gelling material. It is not easy for the two to infiltrate and affinity, and the transition zone between the interfaces is weak, and the interfacial bonding force is poor. Therefore, the strength of EPS lightweight aggregate concrete is relatively low.

[0005] In order to solve the above problems, EPS has been modified in the prior art to overcome the defects existing in the application of EPS particles in concrete, such as Reference 1 and Reference 2:

[0006] Reference 1: Chinese patent document with publication number CN 114315412 A

[0007] Reference 1 describes a modified EPS particle, its modification method, the concrete containing the modified EPS particle and its preparation method, which relates to the technical field of inorganic building materials. The EPS particle modification method is as follows: (1) Under stirring, spray the bonding material on the surface of the EPS particles to obtain EPS particles with the bonding material attached to the surface; (2) Mix the EPS particles with the attached bonding material with the inorganic mixed material to obtain the modified EPS particles; the preparation method of the modified EPS concrete is: after mixing the modified EPS particles with the gel material, add the admixture and water, and stir evenly to obtain the modified EPS concrete. This method ensures good adhesion between the EPS particles and cement, and finally achieves relatively high strength of the EPS concrete, expanding the application range of EPS and enabling it to meet the application requirements of load-bearing structures.

[0008] Reference 2: Chinese patent document with the publication number CN 115872653 A

[0009] Reference 2 describes a modified EPS particle, its preparation method, and the lightweight aggregate concrete containing it, belonging to the technical field of building materials. The preparation method of the modified EPS particle includes the following steps: Soak the EPS particles in the swelling solution, take them out and then soak them in the hydrophilic modification solution at 45 - 55 °C, take them out, wash and dry to obtain the modified EPS particles; the swelling solution is composed of a silane coupling agent, waterborne polyurethane and absolute ethanol; the hydrophilic modification solution is composed of poloxamer, ammonium chloride and water. This method can firmly anchor the hydrophilic groups and hydrophilic ions on the surface of the EPS particles by adopting the technical scheme of swelling first and then hydrophilic modification, which can greatly improve the hydrophilic performance and interfacial bonding force of the EPS particles, and further enhance the adhesion between the EPS particles and the cement paste, improving the strength of the concrete.

[0010] Both Reference 1 and Reference 2 record the modification methods for EPS particles, which improve the hydrophilic performance of the EPS particles. However, the technical methods capable of realizing the hydrophilic modification of EPS particles are not limited to the above two. Based on this, the applicant proposes a modification method for EPS particles different from the prior art. Summary of the Invention

[0011] The purpose of the present invention is to provide a modified EPS particle, its preparation method and its application in ultra-light ceramsite composite wall panels.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is: A preparation method of a modified EPS particle, including the following steps:

[0013] S1. Place the EPS particles to be modified in a container. Mix a monohydric alcohol and water to obtain a mixed solution. Distill the mixed solution. The azeotropic vapor of the monohydric alcohol - water obtained by distillation is introduced into the bottom of the container, and the EPS particles are fumigated with the azeotropic vapor of the monohydric alcohol - water;

[0014] S2. Transfer the fumigated EPS particles to a stirrer with microwave treatment function, add nano - metakaolin powder, and carry out microwave treatment while stirring;

[0015] S3. Turn off the microwave, and spray triethanolamine solution on the surface of the EPS particles while stirring;

[0016] S4. Dry the EPS particles after spraying treatment to obtain the modified EPS particles.

[0017] As a further optimization of the preparation method of the modified EPS particles of the present invention: the monohydric alcohol is C5 - C8 monohydric alcohol, and the mass ratio of the added monohydric alcohol to water is 1.5 - 2:1.

[0018] As a further optimization of the preparation method of the modified EPS particles of the present invention: the monohydric alcohol is n - pentanol or iso - pentanol.

[0019] As a further optimization of the preparation method of the modified EPS particles of the present invention: the specific microwave treatment conditions in step S2 are: power 300 - 800W, time 1 - 5min.

[0020] As a further optimization of the preparation method of the modified EPS particles of the present invention: the particle size of the EPS particles is 3 - 5mm.

[0021] As a further optimization of the preparation method of the modified EPS particles of the present invention: the particle size of the nano - metakaolin powder in step S2 is 50 - 80nm.

[0022] The present invention also provides a modified EPS particle, which is prepared by the above - mentioned method.

[0023] The present invention also provides an application of the modified EPS particle in the preparation of ultra - light ceramsite composite wallboard. The preparation process of the ultra - light ceramsite composite wallboard is as follows:

[0024] S1. Take 15 - 30% of cement, 10 - 25% of quartz sand powder, 5 - 10% of silica fume, 15 - 20% of ultra - light ceramsite, 5 - 15% of modified EPS particles, 1 - 5% of polycarboxylate superplasticizer and the balance of water by mass percentage, and mix them fully to obtain a mixed slurry;

[0025] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixed slurry between the two outer wallboards of the wallboard;

[0026] S3. Demold the mold box after natural curing for at least 72 hours after grouting to obtain the lightweight composite wallboard product.

[0027] As a further optimization of the application of the modified EPS particles in the preparation of the ultra-light ceramsite composite wallboard in the present invention: the particle size of the ultra-light ceramsite is 1-2 μm, and its bulk density is 180-200 kg / m 3 .

[0028] The present invention has the following beneficial effects: The present invention uses the azeotropic steam of monohydric alcohol and water to fumigate the EPS particles. During the swelling process of EPS, the monohydric alcohol with both hydrophilic and hydrophobic groups is adsorbed on the EPS. Then, nano-metakaolin is mixed with the EPS particles and microwave treatment is carried out. On the one hand, part of the nano-metakaolin can penetrate into the interior of the EPS, playing a role in weight gain, so that when the EPS particles are mixed with the cement gel material, it is not difficult to mix evenly due to being too light. On the other hand, kaolin is a crystal structure composed of silicon-oxygen tetrahedrons and aluminum-oxygen octahedrons, and the silicon-oxygen tetrahedrons dominate. This crystal structure endows kaolin with good dielectric properties and a relatively high dielectric constant, so it can absorb microwaves. The incorporation of kaolin can improve the effect of microwave treatment. In addition, kaolin contains a large number of polar groups, which can effectively improve the interfacial state between the EPS particles and the gel material, making the strength of the concrete incorporated with the modified EPS particles relatively high. Specific embodiments

[0029] To better understand the present invention, the content of the present invention will be further clarified below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0030] A preparation method of modified EPS particles includes the following steps:

[0031] S1. Place the EPS particles to be modified in a container, mix monohydric alcohol and water to obtain a mixed solution, distill the mixed solution, and introduce the azeotropic steam of monohydric alcohol-water from the bottom of the container into the container, and use the azeotropic steam of monohydric alcohol-water to fumigate the EPS particles for 15-30 minutes.

[0032] Among them, the particle size of the EPS particles is 3-5 mm. The monohydric alcohol is C5-C8 monohydric alcohol, and the chemical structure of the monohydric alcohol conforms to the general formula R-CH2-OH, where R is a carbon chain. As the number of carbon atoms increases, the carbon chain becomes longer. Therefore, the boiling points of these monohydric alcohols increase with the increase of the number of carbon atoms. Specifically, the monohydric alcohol can be n-pentanol or iso-pentanol, and the mass ratio of the monohydric alcohol to water added is 1.5-2:1.

[0033] Pentanol has a hydrophilic group and a hydrophobic group. The structural formula of pentanol is CH3-CH2-CH2-CH2-CH2-OH, where CH3-CH2-CH2-CH2 is the hydrophobic group and -OH is the hydrophilic group.

[0034] S2. Transfer the fumigated EPS particles to a stirrer with microwave treatment function, add nano-metakaolin powder, and carry out microwave treatment while stirring.

[0035] Metakaolin is anhydrous aluminum silicate formed by dehydrating kaolin at an appropriate temperature (600 - 900 °C). It belongs to the layered silicate structure, and the layers are bonded by van der Waals bonds. OH - ions are firmly bonded in it. The addition amount of metakaolin is 2 - 5 times the weight of EPS particles.

[0036] The specific microwave treatment conditions are: power 300 - 800 W, time 1 - 5 min, and the particle size of nano-metakaolin powder is 50 - 80 nm.

[0037] S3. Spray triethanolamine solution on the surface of EPS particles while stirring.

[0038] The molecular structure of triethanolamine contains multiple groups, including hydrophilic groups (such as OH groups) and hydrophobic groups (such as alkyl and carboxyl groups of fatty acids, etc.). Spraying triethanolamine solution can further improve the hydrophilic performance of EPS particles.

[0039] S4. Dry the EPS particles after spraying treatment to obtain modified EPS particles.

[0040] A preparation process for a super-lightweight ceramsite composite wallboard specifically includes the following steps:

[0041] S1. Take 15 - 30% of cement, 10 - 25% of quartz sand powder, 5 - 10% of silica fume, 15 - 20% of super-lightweight ceramsite, 5 - 15% of modified EPS particles, 1 - 5% of polycarboxylate water reducer, and the balance of water by mass percentage, and mix them thoroughly to obtain a mixture slurry;

[0042] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixture slurry between the two outer wallboards of the wallboard;

[0043] Among them, the outer wallboard of the wallboard is calcium silicate board or gypsum board. Both calcium silicate board and gypsum board can be mature boards in the existing technology, which is not the innovation point of this invention and will not be elaborated here.

[0044] S3. Demold the mold box after natural curing for at least 72 h after grouting to obtain a lightweight composite wallboard product.

[0045] Among them, the particle size of the ultra-light ceramsite is 1-2 μm, and its bulk density is 180-200 kg / m 3 .

[0046] The advantage of ultra-light ceramsite is that it is very light in weight and can well reduce the bearing pressure of buildings. At the same time, its high strength, fire resistance, sound insulation and other characteristics also make it an ideal building material. Ultra-light ceramsite can use products that have been mature in the existing technology, which is not the innovation point of this invention and will not be elaborated here. For example, at least the ultra-light ceramsite described in the patent application documents with publication numbers CN102180607B or CN112430063A can be used.

[0047] <Example 1>

[0048] A preparation method of modified EPS particles includes the following steps:

[0049] S1. Take 1000 g of EPS particles to be modified and place them in a container. Mix n-pentanol and water with a mass ratio of 1.5:1 to obtain a mixed solution. Distill the mixed solution. The n-pentanol-water azeotropic vapor obtained by distillation is introduced into the bottom of the container, and the EPS particles are fumigated with the n-pentanol-water azeotropic vapor. The fumigation treatment time is 15 min;

[0050] S2. Transfer the fumigated EPS particles to a stirrer with microwave treatment function, add 2500 g of nano-metakaolin powder, and perform microwave treatment while stirring. The specific microwave treatment conditions are: power 300 W, time 5 min, and the particle size of the nano-metakaolin powder is 50 nm.

[0051] S3. Sprinkle triethanolamine solution on the surface of the EPS particles while stirring; the dosage of the triethanolamine solution is 50 g.

[0052] S4. Dry the EPS particles after spraying treatment to obtain the modified EPS particles.

[0053] <Example 2>

[0054] A preparation method of modified EPS particles includes the following steps:

[0055] S1. Take 1000 g of EPS particles to be modified and place them in a container. Mix n-hexanol and water with a mass ratio of 2:1 to obtain a mixed solution. Distill the mixed solution. The n-pentanol-water azeotropic vapor obtained by distillation is introduced into the bottom of the container, and the EPS particles are fumigated with the n-pentanol-water azeotropic vapor. The fumigation treatment time is 30 min;

[0056] S2. Transfer the fumigated EPS particles to a stirrer with microwave treatment function, add 5000 g of nano-metakaolin powder, and perform microwave treatment while stirring. The specific microwave treatment conditions are: power 800 W, time 1 min, and the particle size of the nano-metakaolin powder is 80 nm.

[0057] S3. Spray triethanolamine solution on the surface of the EPS particles while stirring; the dosage of the triethanolamine solution is 45 g.

[0058] S4. Dry the sprayed EPS particles to obtain the modified EPS particles.

[0059] <Example 3>

[0060] A preparation method of modified EPS particles, comprising the following steps:

[0061] S1. Take 1000 g of EPS particles to be modified and place them in a container. Mix isopentanol and water with a mass ratio of 1.8:1 to obtain a mixed solution, distill the mixed solution, and let the n-pentanol-water azeotropic vapor obtained by distillation pass through the bottom of the container. Use the n-pentanol-water azeotropic vapor to fumigate the EPS particles, and the fumigation treatment time is 20 min;

[0062] S2. Transfer the fumigated EPS particles to a stirrer with microwave treatment function, add 2500 g of nano-metakaolin powder, and perform microwave treatment while stirring. The specific microwave treatment conditions are: power 500 W, time 3 min, and the particle size of the nano-metakaolin powder is 60 nm.

[0063] S3. Spray triethanolamine solution on the surface of the EPS particles while stirring; the dosage of the triethanolamine solution is 55 g.

[0064] S4. Dry the sprayed EPS particles to obtain the modified EPS particles.

[0065] <Example 4>

[0066] A preparation process of ultra-light ceramsite composite wallboard, specifically comprising the following steps:

[0067] S1. Take 15% of cement, 25% of quartz sand powder, 5% of silica fume, 20% of ultra-light ceramsite, 5% of the modified EPS particles prepared in Example 1, 5% of polycarboxylate water reducer and the remaining amount of water by mass percentage, and mix them thoroughly to obtain a mixed slurry;

[0068] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixed slurry between the two outer wallboards of the wallboard;

[0069] S3. After natural curing the grouted mold box for at least 72 h, demold it to obtain a lightweight composite wallboard product.

[0070] <Example 5>

[0071] A preparation process for an ultra-light ceramsite composite wallboard specifically includes the following steps:

[0072] S1. Take 30% cement, 10% quartz sand powder, 10% silica fume, 15% ultra-light ceramsite, 15% modified EPS particles prepared in Example 1, 1% polycarboxylate water reducer, and the balance water by mass percentage, and mix them thoroughly to obtain a mixed slurry;

[0073] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixed slurry between the two outer wallboards of the wallboard;

[0074] S3. Naturally cure the mold box after grouting for at least 72 hours and then demold it to obtain a lightweight composite wallboard product.

[0075] <Example 6>

[0076] A preparation process for an ultra-light ceramsite composite wallboard specifically includes the following steps:

[0077] S1. Take 20% cement, 15% quartz sand powder, 8% silica fume, 16% ultra-light ceramsite, 10% modified EPS particles prepared in Example 1, 3% polycarboxylate water reducer, and the balance water by mass percentage, and mix them thoroughly to obtain a mixed slurry;

[0078] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixed slurry between the two outer wallboards of the wallboard;

[0079] S3. Naturally cure the mold box after grouting for at least 72 hours and then demold it to obtain a lightweight composite wallboard product.

[0080] <Comparative Example 1>

[0081] A preparation process for an ultra-light ceramsite composite wallboard specifically includes the following steps:

[0082] S1. Take 20% cement, 15% quartz sand powder, 8% silica fume, 16% ultra-light ceramsite, 10% EPS particles, 3% polycarboxylate water reducer, and the balance water by mass percentage, and mix them thoroughly to obtain a mixed slurry;

[0083] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixed slurry between the two outer wallboards of the wallboard;

[0084] S3. Naturally cure the mold box after grouting for at least 72 hours and then demold it to obtain a lightweight composite wallboard product.

[0085] <Comparative Example 2>

[0086] A preparation process of ultra-light ceramsite composite wallboard, specifically including the following steps:

[0087] S1. Take 20% of cement, 15% of quartz sand powder, 8% of silica fume, 16% of ultra-light ceramsite, 10% of modified EPS particles, 3% of polycarboxylate water reducer and the balance of water by mass percentage, and mix them fully to obtain a mixture slurry;

[0088] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixture slurry between the two outer wallboards of the wallboard;

[0089] S3. Naturally cure the mold box after grouting for at least 72 hours and then demold it to obtain a light composite wallboard product.

[0090] Among them, the preparation method of the modified EPS particles is as follows:

[0091] S1. Take 1000 g of EPS particles to be modified and place them in a container. Mix n-pentanol and water with a mass ratio of 1.5:1 to obtain a mixed solution, distill the mixed solution, and the n-pentanol-water azeotropic steam obtained by distillation is introduced into the bottom of the container, and use the n-pentanol-water azeotropic steam to fumigate the EPS particles, and the fumigation treatment time is 15 minutes;

[0092] S2. Spray triethanolamine solution on the surface of the EPS particles while stirring; the dosage of the triethanolamine solution is 50 g.

[0093] S3. Dry the EPS particles after spraying treatment to obtain the modified EPS particles.

[0094] <Comparative Example 3>

[0095] A preparation process of ultra-light ceramsite composite wallboard, specifically including the following steps:

[0096] S1. Take 20% of cement, 15% of quartz sand powder, 8% of silica fume, 16% of ultra-light ceramsite, 10% of modified EPS particles, 3% of polycarboxylate water reducer and the balance of water by mass percentage, and mix them fully to obtain a mixture slurry;

[0097] S2. Place two outer wallboards of the wallboard in a mold box, and pour the mixture slurry between the two outer wallboards of the wallboard;

[0098] S3. Naturally cure the mold box after grouting for at least 72 hours and then demold it to obtain a light composite wallboard product.

[0099] Among them, the preparation method of the modified EPS particles is as follows:

[0100] S1. Transfer the EPS particles to be modified into a stirrer with microwave treatment function, add 2500 g of nano-metakaolin powder, and perform microwave treatment while stirring. The specific microwave treatment conditions are: power 300 W, time 5 min, and the particle size of the nano-metakaolin powder is 50 nm.

[0101] S2. Sprinkle triethanolamine solution on the surface of the EPS particles while stirring; the dosage of the triethanolamine solution is 50 g.

[0102] S3. Dry the EPS particles after spraying treatment to obtain the modified EPS particles.

[0103] <Strength test>

[0104] Take the mixed slurry prepared in Examples 4 - 6 and Comparative Examples 1 - 3 and densely pack it into a specified sample mold. Wait for the composite material to harden and form, place it in a curing box for curing until 28 d, and then soak the test block in normal temperature water for 4 d. The size of the sample is 150 mm × 150 mm × 150 mm.

[0105] Detect the compressive strength of the sample according to GB / T50081 - 2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", and the results are as follows:

[0106] Group Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 <![CDATA[Dry density (Kg / m 3 )]]> 1148 1147 1177 1124 1154 1141 Compressive strength (MPa) 16.8 15.6 15.8 8.8 12.4 10.8

[0107] It can be seen from the above table that the 28 - day compressive strength of the samples corresponding to Examples 4 - 6 is significantly better than that of the samples corresponding to Comparative Examples 1 - 3. The applicant believes that this is because the samples corresponding to Examples 4 - 6 contain particles of EPS uniquely modified by the present invention. After the EPS particles are uniquely modified, their hydrophilic properties and the interfacial state with the cement - based material are improved, ultimately enhancing the compressive strength of the concrete. The compressive strength of the sample in Comparative Example 1 is the lowest, which is because the EPS particles added in Comparative Example 1 are ordinary unmodified EPS particles, which have problems such as difficulty in wetting and affinity, weak transition zone between interfaces, and poor interfacial bonding force, thus resulting in lower concrete strength. The compressive strength of the sample in Comparative Example 2 is higher than that in Comparative Example 3, which is because in the process of modifying EPS particles, the azeotropic steam fumigation treatment with monohydric alcohol - water has a greater impact on the modification effect of the final EPS particles compared with the microwave treatment with bentonite.

[0108] [[ID=

Claims

1. A method for preparing modified EPS particles, characterized in that: The following steps are involved: S1. Place EPS particles to be modified in a container, mix monohydric alcohol and water to obtain a mixed solution, distill the mixed solution, and pass the monohydric alcohol-water azeotropic steam obtained by distillation into the bottom of the container, and use the monohydric alcohol-water azeotropic steam to fumigate the EPS particles; The monohydric alcohol is a C5-C8 monohydric alcohol, and the added mass ratio of the monohydric alcohol to water is 1.5-2:1; S2, transferring the fumigated EPS particles to a stirrer with microwave function, adding nano-metakaolin powder, and performing microwave treatment while stirring; S3, turn off the microwave and spray triethanolamine solution on the surface of EPS particles while stirring; S4. Drying the sprayed EPS particles to obtain modified EPS particles.

2. The method for preparing modified EPS particles according to claim 1, wherein: The monohydric alcohol is n-amyl alcohol or isoamyl alcohol.

3. The method for preparing modified EPS particles according to claim 1, wherein: The microwave treatment conditions in step S2 are specifically as follows: power 300-800W, time 1-5 min.

4. The method for preparing modified EPS particles according to claim 1, wherein: The particle size of the EPS particles is 3-5 mm.

5. The method for preparing modified EPS particles according to claim 1, wherein: The particle size of the nano-metakaolin powder in step S2 is 50-80 nm.

6. A modified EPS particle, characterized in that: The invention is prepared by the method according to any one of claims 1 to 5.

7. Use of the modified EPS particles as claimed in claim 6 in the preparation of ultra-light ceramsite composite wallboards.

8. Use of the modified EPS particles according to claim 7 in the preparation of ultra-light ceramsite composite wallboards, characterized in that: The preparation process of ultra-light ceramsite composite wallboard is as follows: S1. Take 15-30% cement, 10-25% quartz sand powder, 5-10% silica fume, 15-20% ultra-light ceramsite, 5-15% modified EPS particles, 1-5% polycarboxylate water-reducing agent and the balance water by mass percentage, mix thoroughly to obtain a mixed slurry; S2. Place two outer wall panels in a mold box and pour mixed slurry between the two outer wall panels; S3. The mold box after grouting is naturally cured for at least 72 hours and then demolded to obtain a lightweight composite wall panel product.

9. Use of the modified EPS particles according to claim 8 in the preparation of ultra-light ceramsite composite wallboards, characterized in that: The particle size of the ultra-light ceramsite is 1-2 μm, and its bulk density is 180-200 kg / m 3 .