阅读说明：本技术 一种磷石膏基轻质保温地暖模块及其制备方法 (Phosphogypsum-based light heat-preservation floor heating module and preparation method thereof ) 是由 张启卫 彭步平 罗进峰 杨步雷 杨永彬 刘小成 宋维相 安光文 徐韦洪 李贵汶 于 2020-05-21 设计创作，主要内容包括：本发明属于建材技术领域,一种磷石膏基轻质保温地暖模块及其制备方法,由以下重量份的原料制成：磷建筑石膏80-105份、玻化微珠3-10份、粒径≤2cm的聚苯颗粒1-5份、水泥3-10份、聚丙烯纤维0.1-3份、缓凝剂0.1-0.5份；磷石膏基轻质保温地暖模块地暖模盒容重不高于1000kg/m<Sup>3</Sup>,抗压强度不低于100Kpa,断裂荷载不低于200N,导热系数不高于0.1W/(m·k),不含甲醛,是一种轻质、保温的新型建筑材料。(The invention belongs to the technical field of building materials, and relates to a phosphogypsum-based light heat-insulation floor heating module and a preparation method thereof, wherein the phosphogypsum-based light heat-insulation floor heating module is prepared from the following raw materials in parts by weight: 80-105 parts of phosphorus building gypsum, 3-10 parts of vitrified micro bubbles, 1-5 parts of polyphenyl granules with the grain diameter less than or equal to 2cm, 3-10 parts of cement, 0.1-3 parts of polypropylene fiber and 0.1-0.5 part of retarder; phosphogypsum-based light heat-preservation floor heating module floor heating mold box with volume weight not higher than 1000kg/m 3 The compressive strength is not lower than 100Kpa, the breaking load is not lower than 200N, the thermal conductivity is not higher than 0.1W/(m.k), and the material does not contain formaldehyde, and is a novel light and heat-insulating building material.)

1. The phosphogypsum-based light heat-insulation floor heating module is characterized by being prepared from the following raw materials in parts by weight: 80-105 parts of phosphorus building gypsum, 3-10 parts of vitrified micro bubbles, 1-5 parts of polyphenyl granules with the grain diameter less than or equal to 2cm, 3-10 parts of cement, 0.1-3 parts of polypropylene fiber and 0.1-0.5 part of retarder.

2. The phosphogypsum-based light heat-preservation floor heating module as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 100 parts of phosphorus building gypsum, 5 parts of cement, 1.5 parts of polypropylene fiber, 0.15 part of retarder, 6 parts of vitrified micro-beads and 1 part of polyphenyl granules with the grain diameter less than or equal to 2 cm.

3. The phosphogypsum-based lightweight heat-preservation floor heating module as claimed in claim 1 or 2, wherein the content of the hemihydrate gypsum in the phosphogypsum building gypsum exceeds 75%, and the balance is one or two of dihydrate gypsum and anhydrous calcium sulfate.

4. The phosphogypsum-based lightweight insulated floor heating module as claimed in claim 1 or 2, characterized in that the cement is replaced by modified cement; the modification method comprises the following steps: mixing lotus leaf powder and 30-50% ethanol solution according to the mass ratio of 1: (2-5) placing the mixture in a reaction kettle, heating the mixture for 10-15min at the temperature of 70-80 ℃, then placing the mixture in the ultrasonic dispersion condition of 130-170W for 10-18min, and then adding water and materials according to the mass ratio of 1: (24-30) mixing and stirring the cement for 5-10min, placing the mixture under the condition of 130-170W for ultrasonic dispersion for 8-10min, separating solid from liquid, and drying the mixture under the condition of 80-100 ℃ of microwave until the surface moisture content is less than or equal to 4%.

5. The phosphogypsum-based light-weight heat-preservation floor heating module as claimed in claim 1 or 2, characterized in that the vitrified micro bubbles have a volume weight of more than or equal to 110kg/m³The cylinder pressure strength is more than or equal to 200kPa, the water absorption is less than or equal to 45 percent, and the surface closed pore rate is more than or equal to 80 percent.

6. The phosphogypsum-based lightweight insulated floor heating module as claimed in claim 1 or 2, characterized in that the vitrified microbeads are replaced by modified vitrified microbeads; the modification method comprises the following steps: mixing sodium oleate with water according to a mass ratio of 1: (1-3) placing in a reaction kettle, heating until sodium oleate is dissolved, performing ultrasonic dispersion for 8-10min under the condition of 130-: and (32-37) mixing and stirring the vitrified micro bubbles for 5-10min, performing ultrasonic dispersion for 12-16min under the condition of 130-170W, and drying the solid part after solid-liquid separation.

7. The phosphogypsum-based lightweight insulated floor heating module as claimed in claim 1 or 2, characterized in that the polypropylene fiber has a length of less than or equal to 3 cm.

8. The phosphogypsum-based lightweight insulated floor heating module as claimed in claim 1 or 2, characterized in that the polypropylene fibers are replaced by modified polypropylene fibers; the modification method comprises the following steps: mixing a silane coupling agent and polypropylene fibers according to the weight ratio of 1: (45-50) mixing at 45-50 deg.C for 10-20 min.

9. The phosphogypsum-based lightweight insulated floor heating module as claimed in claim 1 or 2, characterized in that the retarder has a pH value of 8-9.

10. The method for manufacturing the phosphogypsum-based light-weight heat-preservation floor heating module as claimed in any one of claims 1 to 9, characterized by comprising the following steps:

(1) metering: weighing phosphorous building gypsum, cement, vitrified micro bubbles, polyphenyl granules, polypropylene fibers and a retarder according to parts by weight;

(2) mixing and stirring: pouring the weighed phosphorus building gypsum, cement, polypropylene fiber and retarder into a stirrer for mixing, pouring the weighed vitrified micro bubbles and polyphenyl granules into the stirrer for secondary mixing after uniform mixing, and adding water for wet mixing to obtain slurry;

(3) forming and leveling: pouring the slurry into a mold for molding, scraping redundant slurry while vibrating in the molding process, and leveling after the slurry is solidified;

(4) drying: drying the formed and leveled semi-finished product to discharge attached water, thereby obtaining a finished product.

Technical Field

The invention belongs to the technical field of building materials, and relates to a phosphogypsum-based light heat-preservation floor heating module and a preparation method thereof.

Background

The floor heating module is one of the main optional components at the tail end of the floor heating system and is used for replacing auxiliary materials such as insulation boards, reflection films and staple bolts in the traditional floor heating system. The appearance and the application of the floor heating module greatly simplify the floor heating installation procedure. The type of the floor heating module: the composite material comprises EPS modules, extruded sheet modules, metal and heat insulation material composite modules and cement modules according to material division. Since the birth of the floor heating module, the floor heating module is greatly popular in the market due to the obvious improvement of the floor heating module compared with the traditional floor heating process. The floor heating modules with different forms and different materials have respective advantages and also have various defects, such as high manufacturing cost, relatively weak compressive strength and the like of the composite module. The module made of the plastic cargo material has poor fireproof performance, great fire hazard, short service life and the like. The polystyrene foam plastic has the fatal defects that the heat-resistant temperature is low, the polystyrene foam plastic begins to decompose at 74 ℃, the polystyrene foam plastic is melted and shrunk when the temperature is continuously increased, and the compressive strength of the polystyrene foam plastic is only 0.02-0.03MPa, and the polystyrene foam plastic is easy to collapse when being stressed greatly or stressed unevenly; the cement module has high cost due to the fact that a large amount of resources and energy consumption are consumed in the production process of cement, the hydration rate of the cement is high, a large amount of bubbles are broken before initial setting, and defoaming water, slurry collapse and bleeding segregation are formed.

The phosphogypsum is a solid byproduct generated when phosphorite is treated by sulfuric acid in the production of phosphoric acid, about 4.0-5.0 tons of phosphogypsum are generated per 1 ton of phosphoric acid, and the main component of the phosphogypsum is calcium sulfate dihydrate (CaSO)₄·2H₂O), and also contains small amount of unreacted phosphorus ore, phosphoric acid, fluoride, organic matter, potassium, sodium, etc. After the phosphogypsum is subjected to purification, calcination and modification, the phosphogypsum can be used for producing gypsum building materials. The phosphogypsum is powder, the appearance is grey white, grey black, grey yellow and the like, the attached water is 10 to 30 percent, and the volume weight is 0.733 to 0.88g/cm³The particle diameter is 5-50um generally, the content of calcium sulfate dihydrate is 70-95%, the annual output of phosphogypsum in China is about 7500 ten thousand tons, the accumulated output is about 6 hundred million tons, the method is one of the by-product gypsum with the largest output, and the ecological environment such as atmosphere, soil, underground water and the like in a stacking area and a nearby area can be seriously damaged due to improper treatment. Patent CN201710383656.X discloses a self-leveling lightweight aggregate, which comprises gypsum, portland cement, mineral powder, lightweight aggregate, a defoaming agent and methyl celluloseA coagulation regulator, a water reducing agent and a waterproof agent. The self-leveling floor has the beneficial effects that the self-leveling floor recorded by the scheme is low in price, has the effects of light weight and heat preservation and insulation, and can be matched with the construction of floor heating and partition walls; in addition, the paint also has the advantages of good fluidity and convenient construction; patent CN201610751291.7 discloses a foaming heat-conducting gypsum-based self-leveling floor tile material, belongs to the self-leveling floor tile material field. The feed is prepared from the following components in parts by mass: 49-54 parts of semi-hydrated gypsum, 6-10 parts of cement, 28-30 parts of quartz sand, 10-15 parts of heavy calcium powder, 0.5-1.6 parts of redispersible latex powder, 0.32-0.45 part of water reducing agent, 0.02-0.03 part of water-retaining agent, 0.06-0.11 part of retarder, 5-10 parts of expandable polystyrene particles and 0.1-0.5 part of PP fiber, and the floor heating adopts the material of the scheme, so that the material has the advantages of small shrinkage, difficulty in cracking, high temperature rise speed of the floor heating, low later-stage temperature reduction speed and good water resistance; patent CN201610218238.0 discloses a polyurethane-composite fiber fireproof floor heating insulation board, which comprises the following components in parts by weight: 30-40 parts of polyurethane, 15-24 parts of composite fiber, 8-17 parts of desulfurized gypsum powder, 3-11 parts of polybutadiene epoxy resin, 4-9 parts of ethyl cyclohexane methylene imido ester, 13-20 parts of fine sand, 15-24 parts of bauxite, 7-13 parts of vermiculite powder, 3-9 parts of calcium sulfonate, 8-15 parts of cement slag, 2-5 parts of a fire retardant, 4-8 parts of ammonium potassium polyphosphate and 25-35 parts of water, and the scheme also discloses a preparation method of the polyurethane-composite fiber fireproof floor heating insulation board; however, in the prior art, the utilization amount of the phosphogypsum is not high, and the phosphogypsum is lower than the expansion shrinkage rate of cement, which can cause cracks to appear on the cement part and is influenced by the impurities of the phosphogypsum, so that the phosphogypsum has strict requirements on a water reducing agent, and in the literature, "the research on the technical progress of gypsum-based self-leveling mortar" that the water reducing agent has different use effects due to the influence of the impurities of the industrial byproduct gypsum of the same kind and needs to increase the dynamics for developing and researching the special water reducing agent for the gypsum "is clearly pointed out, which greatly increases the application difficulty of the phosphogypsum, and in addition, the interface bonding force of the gypsum, the cement and theThe chemical properties have an influence. Therefore, the floor heating module made of gypsum still needs to be researched.

Disclosure of Invention

The invention provides a phosphogypsum-based light heat-preservation floor heating module and a preparation method thereof to solve the technical problems.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the phosphogypsum-based light heat-preservation floor heating module is prepared from the following raw materials in parts by weight: 80-105 parts of phosphorus building gypsum, 3-10 parts of vitrified micro bubbles, 1-5 parts of polyphenyl granules with the grain diameter less than or equal to 2cm, 3-10 parts of cement, 0.1-3 parts of polypropylene fiber and 0.1-0.5 part of retarder.

Further, the phosphogypsum-based light heat-preservation floor heating module is prepared from the following raw materials in parts by weight: 100 parts of phosphorus building gypsum, 5 parts of cement, 1.5 parts of polypropylene fiber, 0.15 part of retarder, 6 parts of vitrified micro-beads and 1 part of polyphenyl granules with the grain diameter less than or equal to 2 cm.

Furthermore, the phosphorus building gypsum is a product obtained by calcining phosphogypsum and removing crystal water.

Furthermore, the content of the hemihydrate gypsum in the phosphorus building gypsum exceeds 75 percent, and the balance is dihydrate gypsum (CaSO)₄·2H₂O) or anhydrous calcium sulfate (CaSO)₄) One or two of them.

The cement is Portland cement, and the strength grade is not lower than 42.5.

Further preferably, the cement is replaced by modified cement; the modification method comprises the following steps: mixing lotus leaf powder and 30-50% ethanol solution according to the mass ratio of 1: (2-5) placing the mixture in a reaction kettle, heating the mixture for 10-15min at the temperature of 70-80 ℃, then placing the mixture in the ultrasonic dispersion condition of 130-170W for 10-18min, and then adding water and materials according to the mass ratio of 1: (24-30) mixing and stirring the cement for 5-10min, placing the mixture under the condition of 130-170W for ultrasonic dispersion for 8-10min, separating solid from liquid, and drying the mixture under the condition of 80-100 ℃ of microwave until the surface moisture content is less than or equal to 4%.

After the cement is doped into the mortar, the compression strength and the waterproof performance of the product can be improved, the pH value of slurry can be effectively improved, and the phenomena of mildew and yellowing of the finished product after use are avoided.

According to the invention, the lotus leaf powder is used for modifying the cement, so that the hydration rate of the cement is improved, the chemical shrinkage rate, the plastic shrinkage rate and the water absorption performance of the cement are reduced, meanwhile, the cement and organic matters in lotus leaves are mutually combined, the interface combination between the cement and polyphenyl granules is enhanced, and simultaneously, the workability of slurry and the waterproof performance of a floor heating module are enhanced.

The volume weight of the vitrified micro bubbles is more than or equal to 110kg/m³The cylinder pressure strength is more than or equal to 200kPa, the water absorption is less than or equal to 45 percent, and the surface closed pore rate is more than or equal to 80 percent.

Further preferably, the vitrified microbead is replaced by a modified vitrified microbead; the modification method comprises the following steps: mixing sodium oleate with water according to a mass ratio of 1: (1-3) placing in a reaction kettle, heating until sodium oleate is dissolved, performing ultrasonic dispersion for 8-10min under the condition of 130-: and (32-37) mixing and stirring the vitrified micro bubbles for 5-10min, performing ultrasonic dispersion for 12-16min under the condition of 130-170W, and drying the solid part after solid-liquid separation.

The vitrified micro bubbles and the polyphenyl granules are used as light aggregate with high quality and low price, and the volume weight of the product is reduced and the heat insulation performance of the product is improved after the vitrified micro bubbles and the polyphenyl granules are added.

According to the invention, sodium oleate is used for modifying the vitrified micro bubbles, and the sodium oleate has hydrophobic groups and hydrophilic groups, so that physical and chemical adsorption can be generated with specific atoms on the substances, and the compactness of the vitrified micro bubbles and the proportion of the hydrophilic and hydrophobic groups on the surface are changed, so that when the vitrified micro bubbles are contacted with cement, the foaming performance of the cement can be improved, and a large number of pores are generated in the cement paste. Meanwhile, the sodium oleate modified vitrified small balls have the function of increasing material binding force, the construction efficiency and the heat conductivity coefficient are improved, the heat transfer capacity of the floor heating module is enhanced, and the defects that the vitrified small balls are low in construction efficiency and the heat conductivity coefficient is basically bestant to about 0.07W/(m.K) … … and cannot be applied in a large area in northern areas recorded in the research on the performance optimization and application of the expanded vitrified small ball insulation board are overcome.

The invention utilizes the vitrified micro bubbles, has light weight, excellent physical and chemical properties, outstanding durability, low heat conductivity coefficient, excellent waterproof and high temperature resistance and other properties, and can effectively solve the problems of high water absorption of slurry, reduced later strength of products, hollowing and cracking and the like.

Furthermore, the length of the polypropylene fiber is less than or equal to 3 cm.

Further, the polypropylene fibers are replaced with modified polypropylene fibers; the modification method comprises the following steps: mixing a silane coupling agent and polypropylene fibers according to the weight ratio of 1: (45-50) mixing at 45-50 deg.C for 10-20 min.

The invention can greatly improve the breaking load of the product after being doped with the polypropylene fiber and reduce the damage rate of the product in the transportation and construction.

According to the invention, the silane coupling agent is used for modifying the polypropylene fiber, so that the thermal stability and the water absorption performance of the fiber can be improved, the bonding capability of gypsum, cement and polyphenyl particles is further enhanced, a stable structure is formed, and the mechanical property and the waterproof performance of the floor heating module are effectively improved.

The retarder has a pH value of 8-9.

The particle size of the polyphenyl particles is less than or equal to 2 cm.

Further, the phosphogypsum-based light heat-preservation floor heating module and the preparation method thereof comprise the following steps:

(1) metering: weighing phosphorous building gypsum, cement, vitrified micro bubbles, polyphenyl granules, polypropylene fibers and a retarder according to parts by weight;

(2) mixing and stirring: pouring the weighed phosphorus building gypsum, cement, polypropylene fiber and retarder into a stirrer for mixing, pouring the weighed vitrified micro bubbles and polyphenyl granules into the stirrer for secondary mixing after uniform mixing, and adding water for wet mixing to obtain slurry;

(3) forming and leveling: pouring the slurry into a mold for molding, scraping redundant slurry while vibrating in the molding process, and leveling after the slurry is solidified;

(4) drying: drying the formed and leveled semi-finished product to discharge attached water, thereby obtaining a finished product.

Further, in step (1), the metering error of the retarder should not exceed 0.2%.

Further, a secondary stirring mode is adopted in the step (2), the stirring time is not less than 3min, and the added water accounts for 50-100% of the mass of the dry materials.

Further, in the step (3), the vibration time of the slurry is 1-3 min.

Further, in step (4), the drying temperature does not exceed 100 ℃.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

phosphogypsum-based light heat-preservation floor heating module floor heating mold box with volume weight not higher than 1000kg/m³The compressive strength is not lower than 100Kpa, the breaking load is not lower than 200N, the thermal conductivity is not higher than 0.1W/(m.k), and the material does not contain formaldehyde, and is a novel light and heat-insulating building material.

(1) The invention adopts the phosphorus building gypsum, the cement, the vitrified micro bubbles, the polyphenyl granules, the fibers and the retarder as raw materials, wherein the raw materials used by the phosphorus building gypsum are industrial wastes which are used as air-hardening cementing materials, and the production cost is lower compared with the cementing materials such as cement, lime and the like which are calcined at high temperature because the low-temperature calcination is adopted, so that the production cost of the floor heating module can be effectively reduced and the production benefit can be improved when the phosphorus building gypsum is used for producing the floor heating module.

(2) The invention takes the phosphorus building gypsum as the main raw material, can improve the utilization rate of industrial waste, and is a new green building material variety which is vigorously popularized by China; the phosphorus building gypsum is used as a non-combustible material, has excellent fireproof performance, and a product processed by the phosphorus building gypsum has natural fireproof advantages and can reduce fire hidden danger after being used; in addition, the phosphorus building gypsum has the characteristics of quick setting and good plasticity, the production period of the floor heating module produced by using the phosphorus building gypsum is short, the efficiency is high, and products in various shapes can be produced according to the mould.

(3) The construction of the floor heating module is quicker than that of similar products, and the construction can be completed synchronously with the floor heating pipe, namely the floor heating pipe is laid while the module is covered.

(4) The floor heating module disclosed by the invention has good heat preservation, heat conduction and mechanical properties and good waterproof performance, and effectively solves the problem that condensed water vapor formed between the floor heating pipe and the floor heating module damages the traditional module after the floor heating is closed, so that the service life of the floor heating module disclosed by the invention is longer.

Detailed Description

The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.