CN110818373A - Desulfurized gypsum-based EPS particle thermal insulation wall and preparation method thereof - Google Patents

Abstract

The invention discloses a desulfurized gypsum-based EPS particle thermal insulation wall and a preparation method thereof. The thermal insulation wall is made of main material, auxiliary materials and an appropriate amount of water, and the main material is made of desulfurized gypsum, aluminate cement and ordinary silicon It is composed of acid salt cement, desulfurized gypsum accounts for 65-85wt%, and the auxiliary materials are composed of EPS particles, gypsum retarder, fiber, binder, water reducing agent, building instant glue powder and defoamer. The advantages of the present invention are: (1) the by-products obtained in the industrial production of thermal power plants—desulfurized gypsum and discarded EPS particles are utilized, which has very important practical significance; (2) the prepared desulfurized gypsum The base EPS particle thermal insulation wall is light in weight, high in strength, excellent in water resistance and thermal insulation.

Description

Desulfurized gypsum-based EPS particle thermal insulation wall and preparation method thereof

technical field

The invention relates to a wall and a preparation method thereof, in particular to a desulfurized gypsum-based EPS particle thermal insulation wall and a preparation method thereof, belonging to the technical field of building materials.

Background technique

With the development of modern buildings to high-rise and super-high-rise buildings, more lightweight, thermal insulation and durable wall materials are urgently needed. At present, the gypsum wall board is made from natural building gypsum powder through the steps of adding water, stirring, molding, and curing. Although this gypsum wall board has a good function, the natural gypsum raw material is limited and needs to be processed into fine powder before it can be used.

There are many thermal power plants in my country. The annual emissions of desulfurized gypsum, the by-product of these thermal power plants in industrial production, reach about 100 million tons. The continuous accumulation of desulfurized gypsum not only occupies a large amount of land resources, but also causes environmental pollution and pollution. waste of resources.

With the rapid development of the economy and the rapid improvement of people's living standards, the annual consumption of expanded polystyrene (EPS) foam in my country is on a linear upward trend, and most of the EPS foams used are disposable products, such as: used for packaging/ Foam boxes for transportation, disposable tableware, building insulation boards, etc. EPS foam is an organic polymer material. It takes more than 100 years to degrade under natural conditions. The degradation is difficult and the recycling rate is low. As a result, white EPS foams appear everywhere in rivers, lakes and land for a period of time. The environment has caused "white pollution", and incineration will produce toxic gases, such as CO, dioxins, etc., which pollute the atmosphere and threaten human health.

SUMMARY OF THE INVENTION

The purpose of the present invention is to use desulfurized gypsum and EPS particles as raw materials to provide a desulfurized gypsum-based EPS particle thermal insulation wall with light weight, high strength, excellent water resistance and thermal insulation performance and a preparation method thereof.

In order to achieve above-mentioned goal, the present invention adopts following technical scheme:

The desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that, it is made of main material, auxiliary material and an appropriate amount of water, calculated in mass percentage, wherein:

The main material is composed of desulfurized gypsum, aluminate cement and ordinary Portland cement, desulfurized gypsum accounts for 65%-85%, and the balance is aluminate cement and ordinary Portland cement;

The auxiliary materials are composed of EPS particles, gypsum retarder, fiber, binder, water reducing agent, building instant glue powder and defoamer. It is 0.05%-0.12% of the main material, the amount of fiber is 0.3%-2.0% of the main material, the amount of binder is 0.1%-0.6% of the main material, and the amount of water reducing agent is 0.01%- 0.25%, the dosage of building instant glue powder is 0.05%-0.6% of the main material, and the dosage of defoamer is 0.02%-0.25% of the main material.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned desulfurized gypsum is put into a resistance furnace from industrial residues of thermal power plants, and takes room temperature as the initial temperature, and is heated to 350°C at a rate of 11°C/min, and calcined for 3 hours. , sieved after natural cooling.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the dosage ratio of the aforementioned aluminate cement and ordinary Portland cement is 61:39.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the water-cement ratio is 0.6.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned gypsum retarder is citric acid.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned fibers are basalt fibers.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned binder is a polyvinyl acetate emulsion.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned water reducing agent is a naphthalene sulfonic acid water reducing agent.

The aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that the aforementioned defoamer is an oil-based defoamer.

The method for preparing the aforementioned desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that, comprising the following steps:

Step1: Weigh each raw material according to the formula;

Step2: Pour the binder and water into the stirring pot A according to the ratio of 1:5-10, and stir at low speed for 120s to fully dissolve the binder and water;

Step3: Pour the EPS particles into the mixing pot A, stir at low speed for 60s, so that the EPS particles are fully wrapped with the binder;

Step4: Pour the aluminate cement and ordinary Portland cement into the mixing pot B, stir at low speed for 60s, then pour the desulfurized gypsum into the mixing pot B, stir at low speed for 60s, and then pour the gypsum retarder into the mixing pot B. In the mixing pot B, stir at low speed for 30s, and finally pour the water reducing agent into the mixing pot B, and stir at low speed for 30s;

Step5: Step3 and Step4 end at the same time, pour the materials in mixing pot A into mixing pot B, and continue to stir at low speed for 30s;

Step6: Pour the fiber and an appropriate amount of water into the mixing pot C at the same time, stir at low speed for 30s, then pour the building instant glue powder into the mixing pot C, stir at low speed for 30s, so that the building instant glue powder is evenly dispersed in the water;

Step7: Step5 and Step6 end at the same time, pour the materials in the stirring pot C into the stirring pot B, and then pour the defoamer into the stirring pot B, first stir at low speed for 60s, then at high speed for 30s, after stirring, put the The material in the stirring pot B is poured into the mold, vibrated to form, and naturally maintained.

The benefits of the present invention are:

(1) The EPS particles are incorporated into the desulfurized gypsum-based thermal insulation wall. Due to the incorporation of EPS particles, the gypsum board becomes lighter. At the same time, the EPS particles also have a thermal insulation effect, which improves the thermal insulation performance of the gypsum board. The desulfurized gypsum-based EPS particle thermal insulation wall provided by the invention not only solves the problem of stacking of desulfurized gypsum, but also solves the problem of "white pollution" caused by waste EPS. The invention has very important practical significance.

(2) Using calcined desulfurized gypsum, aluminate cement and ordinary Portland cement as the main materials, and using the flash setting properties of aluminate and ordinary Portland after blending, the initial setting time of gypsum and cement is similar to that of cement. The matching improves the water resistance of the gypsum board, expands its application field, and at the same time improves the strength of the gypsum board due to the doping of cement.

(3) The EPS particles are modified (the EPS particles are fully wrapped with a binder to make the surface of the EPS particles hydrophilic), so that the EPS particles can be closely combined with the cementitious material, thereby improving the The apparent density of EPS particles is small and floating in the gypsum slurry, and the EPS particles are more uniformly dispersed in the board.

(4) Basalt fiber has good strength and performance advantages. By adding basalt fiber in the preparation process, it exerts its fiber entanglement effect and connects the gypsum matrix, so that the EPS particles of the present invention will not have the effect of floating due to fiber entanglement and hindering effect. The uniform distribution of EPS in the sheet promotes the overall improvement of sheet performance.

(5) The incorporation of admixtures such as gypsum retarder, binder, water-reducing agent, building instant glue powder, and defoaming agent makes the water-to-binder ratio of the cementitious material reach the optimum state, which promotes the application of the present invention to the wall. practical application of the body.

Detailed ways

The present invention will be specifically introduced below with reference to specific embodiments.

Example 1

In terms of mass percentage, weigh the main materials: desulfurized gypsum, aluminate cement and ordinary Portland cement, among which, desulfurized gypsum accounts for 65%, aluminate cement accounts for 21.35%, and ordinary Portland cement accounts for 13.65%.

In mass percentage, weigh the accessories: EPS particles, gypsum retarder (citric acid), fiber (basalt fiber), binder (polyvinyl acetate emulsion), water reducing agent (naphthalene sulfonic acid water reducing agent), construction Instant glue powder and defoamer (oil defoamer), wherein the dosage of EPS particles is 0.5% of the main material, the dosage of citric acid is 0.08% of the main material, and the dosage of basalt fiber is 2.0% of the main material, The dosage of polyvinyl acetate emulsion is 0.6% of the main material, the dosage of naphthalenesulfonic acid water reducing agent is 0.25% of the main material, the dosage of building instant glue powder is 0.6% of the main material, and the dosage of grease defoamer is the main material. 0.25% of the material.

In terms of mass percentage, weigh an appropriate amount of laboratory water, and the amount of laboratory water is 60% of the main material.

Desulfurized gypsum: from the industrial residue of Xinjiang Shihezi Tianfu Thermal Power Plant, put the industrial residue into a resistance furnace, take room temperature as the initial temperature, rise to 350°C at a rate of 11°C/min, calcinate for 3 hours, and sieve it after natural cooling. to make. The performance of desulfurized gypsum produced by coal-fired power generation is roughly the same as that of natural gypsum. Replacing natural gypsum with desulfurized gypsum will not only not affect the performance of gypsum board, but also reduce the waste of land resources (a large amount of desulfurized gypsum will occupy land resources).

Aluminate cement, ordinary Portland cement: its own strength is high, when mixed with other materials, it can be well blended with other materials, and further improve its own strength.

Basalt fiber has the advantages of high strength, high toughness, high temperature resistance, small shrinkage, non-flammable, non-toxic, low-carbon and environmental protection, and is harmless to the environment and health.

EPS particles are a light-weight polymer. After adding EPS particles to the wall, the EPS particles occupy a large proportion of the gypsum matrix, which reduces the quality of the gypsum body. In addition, the entanglement of fibers inhibits the floating of EPS particles and improves the performance. Therefore, the apparent density of the gypsum board is significantly reduced, and a lightweight, high-strength desulfurized gypsum board is obtained. In addition, the EPS particles have both thermal insulation effects and improve the thermal insulation performance of the gypsum board. At the same time, after modification of desulfurized gypsum by aluminate and ordinary Portland cement, its water resistance was improved. Since most of the raw materials are made of waste, the recycling of solid waste is promoted, and the development needs of green building materials are also met.

Pour the polyvinyl acetate emulsion and water into the mixing pot A at a ratio of 1:5, stir at low speed for 120s to fully dissolve the polyvinyl acetate emulsion and water, then pour the EPS particles into the mixing pot A, stir at low speed for 60s , so that the EPS particles are fully wrapped around the polyvinyl acetate.

Pour the aluminate cement and ordinary Portland cement into the mixing pot B, stir at low speed for 60s, then pour the desulfurized gypsum into the mixing pot B, stir at low speed for 60s, and then pour the citric acid into the mixing pot B , stir at low speed for 30s, and finally pour the naphthalenesulfonic acid water reducing agent into the stirring pot B, and stir at low speed for 30s.

Stirring pot A and stirring pot B should be finished stirring at the same time, then pour the materials in stirring pot A into stirring pot B, and continue to stir at low speed for 30s.

Pour the basalt fiber and water into mixing pot C at the same time, stir at low speed for 30s, then pour the building instant glue powder into mixing pot C, stir at low speed for 30s, so that the building instant glue powder is evenly dispersed in the water.

Stirring pot C and stirring pot B (the material in stirring pot A and the material in stirring pot B have been mixed) should be stirred at the same time, and then the material in stirring pot C is poured into stirring pot B, and then the grease is eliminated. The foaming agent is poured into the mixing pot B, first stirred at low speed for 60s, and then at high speed for 30s. After the stirring, the material in the mixing pot B was poured into a 40mm×40mm×160mm mold, and then vibrated and formed. Natural conservation under laboratory conditions for 7 days.

According to GB/T17669.3-1999 "Determination of Mechanical Properties of Plaster of Building", the mechanical properties of the prepared wall panels were tested, and the measured results are shown in Table 1.

Table 1 Technical parameters of mechanical properties of desulfurized gypsum-based EPS particle wall board

project Apparent density Flexural strength Compressive strength parameter 1.22g/cm³ 4.91MPa 8.06MPa

Example 2

In terms of mass percentage, weigh the main materials: desulfurized gypsum, aluminate cement and ordinary Portland cement, among which, desulfurized gypsum accounts for 75%, aluminate cement accounts for 15.25%, and ordinary Portland cement accounts for 9.75%.

In mass percentage, weigh the accessories: EPS particles, gypsum retarder (citric acid), fiber (basalt fiber), binder (polyvinyl acetate emulsion), water reducing agent (naphthalene sulfonic acid water reducing agent), construction Instant glue powder and defoamer (oil defoamer), wherein the dosage of EPS particles is 0.35% of the main material, the dosage of citric acid is 0.08% of the main material, and the dosage of basalt fiber is 1.2% of the main material, The dosage of polyvinyl acetate emulsion is 0.4% of the main material, the dosage of naphthalenesulfonic acid water reducing agent is 0.15% of the main material, the dosage of building instant glue powder is 0.35% of the main material, and the dosage of grease defoamer is the main material. 0.15% of the material.

In terms of mass percentage, weigh an appropriate amount of laboratory water, and the amount of laboratory water is 60% of the main material.

According to the same method as Example 1, the production of wall panels was carried out, and it was also naturally cured for 7d under laboratory conditions.

According to the same method as in Example 1, the mechanical properties of the prepared wall panel were tested, and the measured results are shown in Table 2.

Table 2 Technical parameters of mechanical properties of desulfurized gypsum-based EPS particle wall board

project Apparent density Flexural strength Compressive strength parameter 1.18g/cm³ 4.00MPa 8.97MPa

Example 3

In terms of mass percentage, weigh the main materials: desulfurized gypsum, aluminate cement and ordinary Portland cement, among which, desulfurized gypsum accounts for 80%, aluminate cement accounts for 12.2%, and ordinary Portland cement accounts for 7.8%.

In mass percentage, weigh the accessories: EPS particles, gypsum retarder (citric acid), fiber (basalt fiber), binder (polyvinyl acetate emulsion), water reducing agent (naphthalene sulfonic acid water reducing agent), construction Instant glue powder and defoamer (oil defoamer), wherein the dosage of EPS particles is 0.3% of the main material, the dosage of citric acid is 0.08% of the main material, and the dosage of basalt fiber is 0.8% of the main material, The dosage of polyvinyl acetate emulsion is 0.3% of the main material, the dosage of naphthalenesulfonic acid water reducing agent is 0.1% of the main material, the dosage of building instant glue powder is 0.2% of the main material, and the dosage of grease defoamer is the main material. 0.1% of the material.

In terms of mass percentage, weigh an appropriate amount of laboratory water, and the amount of laboratory water is 60% of the main material.

According to the same method as Example 1, the production of wall panels was carried out, and it was also naturally cured for 7d under laboratory conditions.

According to the same method as in Example 1, the mechanical properties of the prepared wall panel were tested, and the measured results are shown in Table 3.

Table 3 Technical parameters of mechanical properties of desulfurized gypsum-based EPS particle wall board

project Apparent density Flexural strength Compressive strength parameter 1.19g/cm³ 4.68MPa 10.28MPa

As can be seen from the parameters given in Table 1, Table 2 and Table 3, compared with the existing gypsum wall, the compressive strength and flexural strength of the wall board prepared by the formula and method provided by the present invention have a large margin. The apparent density decreases significantly, so the wall board has the characteristics of light weight, high strength, excellent water resistance and thermal insulation performance.

In addition, in the formula provided by the present invention, since industrial waste residue-desulfurized gypsum and domestic solid waste-EPS particles are used as raw materials, it not only realizes the recycling of industrial waste, but also protects the environment and saves money. Land Resources.

To sum up, the wall board prepared by the formula and method provided by the present invention is a wall material with high compressive and flexural strength and excellent thermal insulation performance. prospect.

It should be noted that the above embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. Desulfurized gypsum-based EPS particle thermal insulation wall is characterized in that, it is made of main material, auxiliary material and an appropriate amount of water, in mass percent, wherein: The main material is composed of desulfurized gypsum, aluminate cement and ordinary Portland cement, desulfurized gypsum accounts for 65%-85%, and the balance is aluminate cement and ordinary Portland cement; The auxiliary materials are composed of EPS particles, gypsum retarder, fiber, binder, water reducing agent, building instant glue powder and defoamer. It is 0.05%-0.12% of the main material, the amount of fiber is 0.3%-2.0% of the main material, the amount of binder is 0.1%-0.6% of the main material, and the amount of water reducing agent is 0.01%- 0.25%, the dosage of building instant glue powder is 0.05%-0.6% of the main material, and the dosage of defoamer is 0.02%-0.25% of the main material. 2. The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1, wherein the desulfurized gypsum is made of industrial residues of a thermal power plant in an electric resistance furnace, with room temperature as the initial temperature, at a speed of 11°C/min The temperature was raised to 350°C, calcined for 3 hours, and then sieved after cooling down naturally. 3. The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1, wherein the consumption ratio of the aluminate cement and the ordinary Portland cement is 61:39. 4 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 3 , wherein the water-cement ratio is 0.6. 5 . 5 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1 , wherein the gypsum retarder is citric acid. 6 . 6 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1 , wherein the fibers are basalt fibers. 7 . 7 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1 , wherein the binder is a polyvinyl acetate emulsion. 8 . 8 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1 , wherein the water reducing agent is a naphthalenesulfonic acid water reducing agent. 9 . 9 . The desulfurized gypsum-based EPS particle thermal insulation wall according to claim 1 , wherein the defoamer is a grease defoamer. 10 . 10. The method for preparing the desulfurized gypsum-based EPS particle thermal insulation wall described in any one of claims 1 to 9, characterized in that, comprising the following steps: Step1: Weigh each raw material according to the formula; Step2: Pour the binder and water into the stirring pot A according to the ratio of 1:5-10, and stir at low speed for 120s to fully dissolve the binder and water; Step3: Pour the EPS particles into the mixing pot A, stir at low speed for 60s, so that the EPS particles are fully wrapped with the binder; Step4: Pour the aluminate cement and ordinary Portland cement into the mixing pot B, stir at low speed for 60s, then pour the desulfurized gypsum into the mixing pot B, stir at low speed for 60s, and then pour the gypsum retarder into the mixing pot B. In the mixing pot B, stir at low speed for 30s, and finally pour the water reducing agent into the mixing pot B, and stir at low speed for 30s; Step5: Step3 and Step4 end at the same time, pour the materials in the mixing pot A into the mixing pot B, and continue to stir at low speed for 30s; Step6: Pour the fiber and an appropriate amount of water into the mixing pot C at the same time, stir at low speed for 30s, then pour the building instant glue powder into the mixing pot C, stir at low speed for 30s, so that the building instant glue powder is evenly dispersed in the water; Step7: Step5 and Step6 end at the same time, pour the materials in the stirring pot C into the stirring pot B, and then pour the defoamer into the stirring pot B, first stir at low speed for 60s, then at high speed for 30s, after stirring, put the The material in the stirring pot B is poured into the mold, vibrated to form, and naturally maintained.