CN101244919A - A preparation technology of loess foamed lightweight brick - Google Patents

Abstract

A preparation technology for loess foamed lightweight bricks, characterized in that adding water to loess to make a thick slurry, first adding a water-soluble polymer to the loess thick slurry, then adding Portland cement, then adding a foaming agent, and then Perform high-speed dispersion and foaming for 10-30 minutes to obtain foamed thick loess slurry, pour the foamed loess thick slurry into a mold, and obtain foamed loess lightweight bricks after the foamed loess thick slurry is dried. The foamed loess prepared by this technology can be used for filling the ground, floors and walls, and can play the role of sound insulation and heat insulation.

Description

A preparation technology of loess foamed lightweight brick

technical field

The invention relates to a preparation technology of loess foamed lightweight brick, in particular, a building filling material and a technology for preparing the material.

Background technique

Loess is an inorganic oxide, rich in resources, inexhaustible, cheap and easy to get. If it is made into a building cell material, it has low density, high compressive strength, no cracks, good sound absorption and sound insulation, which can not only reduce the load of the building, but also have multiple functions such as heat preservation and heat insulation. Its product quality is related to the bonding ability of the base material, the strength of the base material, the size of the cells, the pore size distribution and porosity of the cells, etc. The key factors are to select the appropriate base material formula, the type of foaming agent and the foaming agent. Bubble process, method.

Chinese patent CN1173475 discloses a method for preparing lightweight partition boards. The filler is made of fly ash, magnesium oxide and ordinary cement, and the gel agent is made of industrial glue and magnesium chloride brine for emulsification modification. Rosin , industrial bone glue, sodium hydroxide, puffing foaming agent, and water to make puffed foaming liquid, and then add the above three ingredients according to the metered amount to make a foaming paste, and then lay the aggregate on the mold and embed the pipe , and finally solidified and demoulded, and repaired with flying hair.

Chinese patent CN1217304 discloses a magnesium oxychloride cement waterproof foaming agent and a preparation method thereof. According to (volume ratio) bone glue 0.8-2%, urea-formaldehyde resin 0.8-2%, sodium dodecylbenzenesulfonate (solid content 20%) 5-10%, triethanolamine (solid content 20%) 0.8-2.5% and The ratio of the remaining water to prepare the raw materials, first mix the bone glue and urea-formaldehyde resin and add 10 times the water, heat at 65-75°C for 20-30 minutes to make a glue, and then mix it with dodecylbenzenesulfonate Sodium bicarbonate and triethanolamine are mixed, heated at 65-75°C for 5-10 minutes, and finally diluted with water to make the product.

Chinese patent CN1272420 discloses a method for continuous production of lightweight wallboards, which is divided into two steps: the first step, the method of making intermediate masterbatch, water and cement powder are put into the vibrating disc granulator in proportion A layer of cement shell is formed on the expanded polystyrene particles, and then mixed with cement slurry in the extrusion molding machine, and then cut into lightweight wallboards by perforation and extrusion.

Chinese patent CN1313259 discloses a manufacturing method of a fly ash lightweight wall material block. Its basic materials are cement, fly ash, medium-burned lime, limestone powder, and gypsum. Add iron powder, fiber, and air-entraining agent to a certain fraction, and finally add light aggregate materials. The process is to grind fly ash, medium-burned lime and gypsum together, put them into the mixer with other base materials and iron powder according to the formula ratio, mix the external materials with water and add them to the mixer, then add aluminum powder and light aggregate in turn, stir and pour Foaming, green body resting, cutting and curing into finished products.

Chinese patent CN1321619 discloses an energy-saving and environmentally friendly lightweight wall material, which is a hardened body formed by mixing and stirring the main material and water. The composition and volume percentage of the main material are 5-70% of the light component, 10-50% of the bone strength component, 10-60% of the reinforcing component, and 0-30% of the cementing component. The above-mentioned lightweight components are foamed plastic blocks and foamed beads, which can be crushed from waste foamed plastic products. The bone strength component is cement or raw gypsum or magnesium compound, and the reinforcement component is short fiber or/paper pulp, which can be processed from various waste fiber products.

Chinese patent CN1343643 discloses a light-weight thermal insulation material, which is formed by mixing different weights of wollastonite powder, sepiolite, perlite, powdery lime, cement, instant glue, and foaming agent.

Chinese patent CN1351979 discloses a formula and manufacturing process of a heat-insulating and sound-insulating lightweight block, and the formula is calculated by weight percentage. Fly ash 32-42%, gravel surface 30-46%, cement 10-18%, glue 0.12-0.30%, polystyrene foam 0.05-0.1%, water 5.8-17.6%, the production process, the first material selection , weigh fly ash, gravel surface, cement, glue, water according to the formula ratio, pour them into the mixer and stir evenly, pour vibrating pressure into the big box tire mold, then put four iron mold tires, and pour Lift out the iron mold tire by vibrating, put the pre-made polystyrene foam oval body, pour the mixture on it, and vibrate. Immediately remove the mold, lift the tire mold of the large box, and then cure it after a few days.

Chinese patent CN2381691 discloses an inorganic polymer foam sandwich wallboard, which is made of cement and fly ash mixed with foaming agent aluminum powder, which is naturally foamed and formed at normal temperature and pressure, and used as the sandwich layer. It is made of glass cloth, steel wire mesh or thin bamboo fence, supplemented by foaming inorganic high-resolution materials on both sides, and then plastered with cement mortar or gypsum.

Contents of the invention

A preparation technology for loess foamed lightweight bricks, characterized in that adding water to loess to make a thick slurry, first adding a water-soluble polymer aqueous solution to the loess thick slurry, then adding Portland cement, and then adding a foaming agent, Then perform high-speed dispersion and foaming for 10-30 minutes to obtain foamed thick loess slurry, pour the foamed loess thick slurry into a mold, and obtain foamed loess lightweight bricks after the foamed loess thick slurry is dried.

The loess is added with water to make a thick slurry, and the concentration of the thick slurry is 40-80% (wt).

The water-soluble polymer may be one or a mixture of two or more of polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone and polyacrylamide. The concentration of the aqueous solution of the water-soluble polymer is 1-8%, and the added amount of the water-soluble polymer converted into dry weight is 0.1-1% of the weight of the loess.

The Portland cement can be one or more of cements No. 325, No. 425 and No. 525 currently available on the market. Portland cement is added in an amount of 5-30% of the loess weight.

The foaming agent can be one or a mixture of higher fatty acid salts, succinate sulfonates, fatty alcohol sulfates, castor oil sulfates, alkylnaphthalene sulfonates; The added amount of foaming agent is 0.1-5% of the loess weight.

The foamed loess has a density of 300-1000g/cm ³ and a compressive strength of 0.3-1.2MPa.

The foamed loess can be used for filling the ground, floors and walls, and can play the role of sound insulation and heat insulation.

Because the cohesion between the loess particles is low, the strength of the prepared sample is very low simply by foaming loess. The inventors found that adding water-soluble polymers such as polyvinyl alcohol, polyethylene oxide, polyethylene After adding pyrrolidone and polyacrylamide, the bonding force between loess particles can be greatly improved, so that the prepared lightweight brick has low density and high strength.

See GB/T 1964-1996 for sample compressive strength test.

Detailed ways

Example 1

Add 100kg of water into a 1 cubic meter stirred reactor, start stirring, and add 450kg of loess powder into the reactor to make loess thick slurry. Add 20kg of polyvinyl alcohol aqueous solution with a concentration of 3% into the loess slurry, add 30kg of No. 525 cement into the loess slurry, add 0.5kg of sodium stearate into the slurry, and then turn the slurry at 800 rpm Disperse for 20 minutes on a high-speed disperser to obtain a foamy loess thick slurry. Pour the concentrated loess slurry into a mold with dimensions of 40cm in length, 30cm in width and 10cm in height, and dry at 105°C for 4 hours. The obtained loess foamed lightweight brick has a density of 456kg/m ³ and a compressive strength of 0.5MPa.

Example 2

Add 150 kg of water into a 1 cubic meter stirred reactor, start stirring, and add 550 kg of loess powder into the reactor to make loess thick slurry. Add 50kg of 1% polyvinylpyrrolidone aqueous solution into the loess slurry, add 50kg of No. 425 cement into the loess slurry, then add 1.5kg of dioctyl sodium sulfosuccinate into the slurry, then add the slurry with Disperse for 13 minutes on a high-speed disperser at 800 rpm to obtain a foamy loess thick slurry. Pour the concentrated loess slurry into a mold with dimensions of 40cm in length, 30cm in width and 10cm in height, and dry at 105°C for 5 hours. The obtained loess foamed lightweight brick has a density of 522kg/m ³ and a compressive strength of 0.7MPa.

Example 3

Add 120kg of water into a 1 cubic meter stirred reactor, start stirring, and add 350kg of loess powder into the reactor to make loess thick slurry. 40kg concentration of 5% polyoxyethylene aqueous solution is added in the loess slurry, 40kg No. 325 cement is added in the loess slurry, then 1.5kg sodium laurate monoglyceride sulfate is added in the slurry, and then the slurry is mixed with 800 Disperse for 18 minutes on a high-speed disperser with one revolution per minute to obtain a foamy loess thick slurry. Pour the concentrated loess slurry into a mold with dimensions of 40cm in length, 30cm in width and 10cm in height, and dry at 115°C for 2 hours. The obtained loess foamed lightweight brick has a density of 636 kg/m ³ and a compressive strength of 1.1MPa.

Example 4

Add 160kg of water into a 1 cubic meter reactor with stirring, start stirring, and add 380kg of loess powder into the reactor to make loess thick slurry. Add 40kg of polyvinylpyrrolidone aqueous solution with a concentration of 5% into the loess slurry, add 60kg of No. 425 cement into the loess slurry, add 2.5kg of castor oil sulfate sodium salt into the slurry, and then turn the slurry at 800 rpm Disperse for 30 minutes on a high-speed disperser per minute to obtain a foamy loess thick slurry. Pour the thick loess slurry into a mold with dimensions of 40cm in length, 30cm in width and 10cm in height, and dry at 100°C for 3.5 hours. The obtained loess foamed lightweight brick has a density of 691kg/m ³ and a compressive strength of 0.98MPa.

Example 5

Add 200kg of water into a 1 cubic meter reactor with stirring, start stirring, and add 600kg of loess powder into the reactor to make loess thick slurry. Add 80kg of polyacrylamide aqueous solution with a concentration of 5% to the loess slurry, add 100kg of No. 425 cement to the loess slurry, then add 8kg of diisopropylnaphthalenesulfonic acid to the slurry, and then turn the slurry at 800 rpm Disperse on a high-speed disperser per minute for 25 minutes to obtain a foamy loess thick slurry. Pour the concentrated loess slurry into a mold with dimensions of 40cm in length, 30cm in width and 10cm in height, and dry at 100°C for 4.5 hours. The obtained loess foamed lightweight brick has a density of 618kg/m ³ and a compressive strength of 0.77MPa.

Example 6

Add 160kg of water into a 1 cubic meter reactor with stirring, start stirring, and add 380kg of loess powder into the reactor to make loess thick slurry. Add 40kg of polyvinyl alcohol aqueous solution with a concentration of 8% to the loess slurry, add 60kg of No. 425 cement to the loess slurry, add 6kg of sodium dibutylnaphthalene sulfonate to the slurry, and then turn the slurry at 800 rpm Disperse on a high-speed disperser per minute for 15 minutes to obtain a thick foamed loess slurry. The foamed loess thick slurry was dried at 95°C for 4 hours to obtain a foamed loess with a density of 354kg/m ³ and a compressive strength of 0.58MPa.

Claims (7)

1. the technology of preparing of a loess foaming light brick, it is characterized in that, loess is added water make underflow, in the loess underflow, add the water-soluble polymers aqueous solution earlier, add silicate cement then, add whipping agent again, carry out the high speed dispersion foaming then, the loess underflow that obtained foaming in high speed dispersion 10-30 minute is poured the loess underflow of foaming into mould, after the loess underflow drying to be foamed, obtain loess foaming light brick.

2. loess is added water make underflow described in the claim 1,, the loess concentration of making underflow is 40-80% (wt).

3. the water-soluble polymers described in the claim 1 can be one or more the mixture in polyvinyl alcohol, polyoxyethylene, polyvinylpyrrolidone, the polyacrylamide.The concentration of the water-soluble polymers aqueous solution is 1-8%, and the add-on that water-soluble polymers is converted into dry weight is the 0.1-1% of loess weight.

4. the silicate cement described in the claim 1 can be in No. 325, No. 425, No. 525 cement one or more.The add-on of silicate cement is the 5-30% of loess weight.

5. the whipping agent described in the claim 1 can be one or more the mixture in higher fatty acid salt, sulphosuccinates, fatty alcohol sulfate salt, Viscotrol C sulfuric acid, the sulfonated alkyl naphathalene; The add-on of whipping agent is the 0.1-5% of loess weight.

6. the foaming loess described in the claim 1, its density is 300-1000g/cm ³Compressive strength is 0.3-1.2MPa.

7. the foaming loess described in the claim 1 can be used for the filling of ground, floor, body of wall, can play sound insulation, heat insulation effect.