WO2015062333A1

WO2015062333A1 - Anti-carbonation waterproof slurry

Info

Publication number: WO2015062333A1
Application number: PCT/CN2014/084134
Authority: WO
Inventors: 董峰亮; 方楚燕; 邓德安; 徐英; 陈激扬; 胡程; 丁天华; 梁至柔; 周碧平; 万德刚; 严昌俊; 阿那; 梁卓钧; 陈学静; 薛静
Original assignee: 德高（广州）建材有限公司
Priority date: 2013-10-31
Filing date: 2014-08-11
Publication date: 2015-05-07
Also published as: CN103601441B; CN103601441A

Abstract

An anti-carbonation waterproof slurry. The anti-carbonation waterproof slurry is a composite slurry having two components of organic and inorganic materials, and the component raw materials of the slurry comprise: cement, quartz powder, redispersible emulsion powder, cellulose ether, a superplasticizer, a water repellent, a carbonation inhibitor, an emulsion, water, a defoamer, and a preservative. The carbonation inhibitor is obtained by modifying a mixture of calcium oxide and calcium montmorillonite powder by using mineral oil.

Description

Anti-carbonization waterproofing slurry

The invention relates to a waterproof slurry, in particular to a carbonization resistant waterproof slurry, belonging to the technical field of waterproof materials in the construction industry.

Background technique

The so-called "carbonization" means that the cement of the mixed concrete will form Ca(OH) 2 after hydration, and most of it will exist in the concrete in the crystalline state, and it will become a reserve of high porosity in the pores, and its PH value is 12.5~ 13.5. C0 ₂ and moisture are present in the air, and C0 ₂ in the air will permeate into the concrete under the action of water to react with Ca(OH) ₂ to lower the pH to 8.5-9, and the concrete is carbonized. The carbonization of concrete is essentially a process in which the pH of the concrete is reduced and the alkalinity is lost.

Maintaining an alkaline environment for concrete is an important condition for the maintenance of concrete structures and the protection of their internal reinforcement. In a highly alkaline environment, a layer of passivation film is formed on the surface of the steel to prevent corrosion of the steel. The carbonized concrete does not provide sufficient alkalinity, causing the steel to rust and increase in volume, causing cracks and cracks in the concrete. The production causes water and C0 _{2 to} enter the crack, further accelerating the corrosion of the steel. This cycle eventually leads to the destruction of the concrete structure. Concrete carbonization begins with the surface layer and then gradually diffuses into the depth of the concrete, causing a deeper carbonization reaction. The carbonized concrete texture is loose and the strength is greatly reduced. Concrete carbonation resistance is an important indicator of the durability of concrete structures. The low carbonation resistance of concrete results in poor durability and reduced service life of the building.

The method of preventing carbonation of concrete is usually to apply a layer of organic coating on the concrete surface, to seal the concrete pores to prevent other diffusion of co ₂ into the concrete interior, but the organic coating has poor aging resistance and poor compatibility with cement inorganic materials. And the ability to prevent carbonization is not ideal. For example, patent application

CN 103333559A discloses an aqueous transparent concrete waterproof and carbonized coating which is composed of an emulsion, water, a transparent powder, a highly transparent filler, a dust-proofing agent, a dispersing agent, a wetting agent, an antifoaming agent, a filming aid and The composition of the thickening leveling agent is a one-component aqueous styrene-methacrylate-acrylate copolymer emulsion, the transparent powder is anhydrous sodium sulfate, the high transparent filler is white transparent glass powder, and the dispersing agent It is sodium polyacrylate, the wetting agent is nonylphenol ethoxylate, the film forming aid is 2,2,4-1,3-pentanediol monoisobutyrate, and the thickening leveling agent is polyurethane.

The disclosed concrete anti-carbonization coatings have also been reported in view of compatibility with cementitious inorganic materials. For example, the patent CN 101693610 B discloses a concrete anti-carbonization coating which is composed of the following parts by weight. Preparation of each component: 315~525 parts by weight of cement, 45~75 parts by weight of steel slag powder, 45~75 parts by weight of fly ash, 45~75 parts by weight of waste concrete powder, 250~550 parts by weight of styrene-acrylic emulsion, 0.35 parts of dispersing agent 2.6 parts by weight, defoaming agent 0.7 to 2.6 parts by weight, and water 45 to 90 parts by weight.

The CO ₂ in the air penetrates into the concrete in the presence of water to cause the carbonization reaction to occur. Therefore, as the anti-carbonization coating, it is necessary to further consider the waterproof property of the coating. The above patent uses waste concrete powder, and cheap steel slag powder and fly ash as raw materials to prepare anti-carbonization coating. Although it can realize the full use of waste materials, reduce the amount of chemical reagents and reduce the production cost, it does not reflect the There are certain deficiencies in the performance indicators of the product in waterproofing.

Some published patent applications, such as CN 102503300 A, disclose a single component consisting of ordinary Portland cement, dispersible polymer powder, quartz sand, quartz powder, cellulose ether, silica fume, water reducing agent, antifoaming agent. Polymer cement waterproof mortar; CN 10343969 A discloses an ordinary Portland cement 52.5, granulated blast furnace powder 95#, a penetrant (fatty alcohol polyoxyethylene ether), a swelling agent (calcium or calcium hydroxide, Preventing cement leakage crystal type waterproof coating composed of magnesium hydroxide), silica fume, quartz sand, modified bentonite, modified sodium silicate, complexing agent (polyacrylic acid), and crystal precipitation agent (polyethylene glycol), Its carbonization resistance is still not ideal.

Summary of the invention

The object of the present invention is to provide a slurry having anti-carbonization and water-proof function by compounding an organic material and an inorganic material, and the slurry formulation is added with a modified carbonization inhibitor, which is a mineral oil to calcium oxide and calcium base. The montmorillonite powder mixture is modified to modify the active ingredient of the carbonization inhibitor, control the release time of the carbonization inhibitor active ingredient, and provide sufficient active calcium to react with CO ₂ to form water-insoluble crystals. The entire coated thin layer can form a dense and uniform waterproof layer from the surface to the inside, effectively hinder the penetration of moisture, and the moisture only stays on the surface layer, hindering the penetration of co ₂ into the concrete under the action of water, and carbonization occurs. The reaction can obtain better anti-carbonization and waterproof effect; the slurry has good compatibility with inorganic materials such as cement, and only a functional layer of l-2 mm is needed to obtain a good carbonization and waterproof effect.

In order to solve the above problems, the technical solution adopted by the present invention is as follows: A carbonization-proof waterproof paste consisting of two components of B and B, and components A and B are composed of the following parts by weight:

Component A

250-600 parts of cement Quartz powder 250-500 parts

Redispersible latex powder 5-20 parts

Cellulose ether 0.5-5 parts

Superplasticizer 0.5-4 parts

Water repellent 0.3-5 parts

50-100 parts of carbonization inhibitor,

Component B

Emulsion 200-500 parts

Water 400-800 parts

Defoamer 0.5-10 parts

Preservative 0.5-10 parts.

The carbonization inhibitor active ingredient is a mixture of calcium oxide and calcium-based montmorillonite powder, and the calcium oxide and calcium-based montmorillonite powder are mixed in a ratio of 1:1 to 3:1.

The carbonization inhibitor is a modification of a mixture of calcium oxide and calcium-based montmorillonite powder modified by mineral oil, and the mixture of calcium oxide and calcium-based montmorillonite powder is attached to mineral oil mist in the form of aggregates. The particles are then coated with mineral oil particles to form granule microspheres.

The carbonization inhibitor is prepared by the following steps:

(1) using conventional atomization technology, atomizing the mineral oil in the atomization chamber;

(2) The calcium oxide and calcium-based montmorillonite powder are placed in a high-speed mixer at a ratio of 1:1 to 3:1, and uniformly mixed to obtain a mixture powder of calcium oxide and calcium-based montmorillonite powder;

(3) The mixture powder obtained in the step (2) is passed through a feed port, enters the atomization chamber, and is left for 1-10 seconds to obtain a carbonization inhibitor.

The calcium oxide index is as follows: CaO content is greater than or equal to 95%, activity: at least IJ 400ml/4NHu in 10 minutes, particle size above 200 mesh; the calcium-based montmorillonite powder index is as follows: Particle size: 95% less than 200 Micron, 105 ° C volatile content less than 5%, expansion capacity greater than 95 ml / g, 4 ° viscosity at 25 ° C greater than 3000mpa · s.

The strength grade of the cement is preferably 42.5 or 42.5R or 52.5 Portland cement or ordinary silicate cement.

The quartz powder specification is preferably a quartz powder of 100-400 mesh. The redispersible latex powder is preferably an ethylene-vinyl acetate copolymer latex powder or an acrylic latex powder. The cellulose ether is preferably hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether, and the cellulose ether has a viscosity of 500 to 100,000 Pa·s.

The superplasticizer is preferably a polycarboxylic acid-based or naphthalenesulfonate superplasticizer.

The water repellent is preferably calcium stearate or zinc stearate.

The emulsion is preferably a carboxylated styrene butadiene latex or an acrylic emulsion or a styrene-acrylic emulsion having a solid content of 45 to 58%.

The antifoaming agent is preferably a liquid hydrocarbon or a mixture of polyethylene glycol and amorphous non-crystalline cerium oxide. The liquid hydrocarbon is preferably suitable for liquid hydrocarbon defoamers in the coatings industry, such as silicone defoamers, liquid organosilicon oxime defoamers, polyether defoamers, higher alcohols, and the like.

The preservative is preferably a preservative having a 20% dispersion of the isothiazolinone (BIT) active ingredient, such as Promex 20D.

The anti-carbonization waterproofing paste of the present invention is prepared by the following method:

(1) Preparation of carbonization inhibitor: Using conventional atomization technology, the mineral oil is atomized first in the atomization chamber; calcium oxide and calcium-based montmorillonite powder are taken, and calcium oxide and calcium-based montmorillonite powder are 1:1~ The ratio of 3:1 is placed in a high-speed mixer and mixed uniformly to obtain a mixture powder of calcium oxide and calcium-based montmorillonite powder; the prepared mixture powder is passed through the feed port and enters the atomization chamber, and stays 1-10 In seconds, a carbonization inhibitor is produced;

(2) Accurately weigh the raw materials of component B according to the ratio;

(3) Put the component A cement, quartz powder, redispersible latex powder, cellulose ether, superplasticizer, water repellent, carbonization inhibitor into a high-speed disperser, stir for 2-3 minutes, until Mix well, package, and make powder;

(4) Pour the emulsion, water, antifoaming agent and preservative of component B into the liquid blender, stir for 2-3 minutes, until the mixture is evenly mixed, and then the liquid material can be prepared;

(5) During the construction, the powder and liquid materials are uniformly mixed according to the ratio of powder to liquid of 1:0.3-0.4, and the anti-carbonization waterproof slurry can be obtained.

The construction method using the anti-carbonization waterproof slurry is as follows:

(1) Clean the concrete base and fully wet it;

(2) Pour the liquid material into a clean container, then use mechanical agitation in proportion, slowly add the powder while stirring, and stir for 3-5 minutes until a powder-free, uniform glue is formed; (4) Apply the slurry evenly on the treated concrete base with a brush. After brushing one layer, wait for it to dry for 1-2 hours (just do not stick the hand) and then brush the second layer, then apply Brush 3-4 times, the thickness is controlled within 2mm;

(5) After 24 hours of construction, spray mist water to maintain.

The beneficial effects of the present invention over the prior art are as follows:

(1) The slurry of the present invention is a slurry having an anti-carbonization and water-repellent function by compounding an organic material and an inorganic material, and the waterproof slurry conforms to the standard of JC/T 2090-2011 "Polymer cement waterproofing paste" Performance requirements, when used, only need to apply a thin layer of l-2mm, you can get good carbonization and waterproof effect;

(2) The carbonization inhibitor active ingredient in the formulation of the present invention is composed of a mixture of calcium oxide and calcium-based montmorillonite powder, which provides sufficient active calcium to react with co ₂ and form water-insoluble crystals, thereby hindering further of co ₂ Infiltration, carbonized concrete; carbonization inhibitor in the preparation of the component A of the present invention, after modification of mineral oil, the mixture of calcium oxide and calcium-based montmorillonite powder is attached to the mineral oil particles in the form of aggregates Or forming granular microspheres coated with mineral oil, which can effectively protect the presence of a mixture of calcium oxide and calcium-based montmorillonite powder in the powder, avoiding the formation of the waterproof slurry or the change of the external environment. Loss; the application time of the carbonization inhibitor active ingredient can be mixed with the liquid material to make a waterproof slurry. For construction, the mineral oil can have an organic group because of its "hydrophobic/lipophilic" characteristics. The gradual "dissolution" of the slurry causes the mixture of calcium oxide and calcium-based montmorillonite powder to be slowly removed or released, and the slurry is extended to the surface of the construction. Coating a thin layer to the inside, the entire surface is coated by a thin layer can be formed to the inside of a dense, uniform waterproof layer efficiently impede the entry of moisture, the moisture retention in the skin only hinder the role of co ₂ in water at Infiltrated into the concrete, carbonization occurs, obtaining better anti-carbonization and waterproofing effect, and prolonging the service life of the coating to obtain longer concrete protection time.

detailed description

The invention is further illustrated by the following examples, which are intended to illustrate the invention and not to limit the scope of the invention.

Example 1 The anti-carbonization waterproofing paste of the present invention was prepared according to the following formulation and procedure:

(1) Accurately weigh the following materials according to the ratio: (BIT) 2 women,

(2) The carbonization inhibitor is prepared by the following steps: ultrasonic atomization at a frequency of 60 kHz, atomizing the mineral oil in the atomization chamber; the stone powder is placed in a high-speed mixer and mixed uniformly to obtain calcium oxide and calcium base. Mixing powder of montmorillonite powder; then passing the prepared mixture powder through the feed port, into the atomization chamber, and staying for 5 seconds to obtain a carbonization inhibitor;

(3) Put the materials of cement, quartz powder, etc. of component A into a high-speed disperser, stir for 3 minutes, mix until uniform, and package, then make powder;

(4) Accurately refer the component B according to the above ratio

Pour the water and other materials into the liquid mixer, stir for 3 minutes, until the mixture is evenly mixed, and the liquid material can be prepared;

(5) The powder product and the liquid product are uniformly mixed in a ratio of 1:0.3 to obtain a carbonized waterproofing slurry; the obtained carbonized waterproofing slurry is tested for performance indexes, and the results are shown in the following table:

Example 2 The anti-carbonization waterproofing paste of the present invention was prepared according to the following formulation and procedure: (1) Accurately weigh the following materials according to the ratio:

(2) The carbonization inhibitor is prepared by the following steps: ultrasonic atomization at a frequency of 55 kHz, atomization of the mineral oil in the atomization chamber; then placing the calcium oxide and calcium-based montmorillonite powder in a high-speed mixer according to the formulation ratio Mixing uniformly, obtaining a mixture powder of calcium oxide and calcium-based montmorillonite powder; then passing the prepared mixture powder through the feed port, entering the atomization chamber, and staying for 10 seconds to obtain a carbonization inhibitor;

(3) Put the materials of cement, quartz powder, etc. of component A into a high-speed disperser, stir for 2 minutes, until the mixture is evenly mixed, and packaged, then the powder can be made;

(4) Accurately weigh the B component according to the above mixing ratio, pour the emulsion, water and other materials into the liquid mixer, stir for 2 minutes, until the mixture is evenly mixed, and then the liquid material can be prepared;

(5) Mix the powder product and the liquid product in a ratio of 1:0.3 to obtain a carbonized waterproof paste.

Example 3 The anti-carbonization waterproofing paste of the present invention was prepared according to the following formulation and procedure:

(1) Accurately weigh the following materials according to the ratio:

(2) The carbonization inhibitor is prepared by the following steps: Using a compressed air atomization technique, the mineral oil is first atomized in a spray chamber at a pressure of 0.25 MPa; then the calcium oxide and calcium-based montmorillonite powder are placed at a high rate according to the formulation ratio. Mixing uniformly in the mixer to obtain a mixture powder of calcium oxide and calcium-based montmorillonite powder; then, the obtained mixture powder is passed through the feed port, enters the atomization chamber, and stays for 1 second to obtain a carbonization inhibitor;

(4) The component B is accurately weighed according to the above mixing ratio, and the material such as milk ⁵ S liquid and water is poured into a liquid blender, stirred for 3 minutes, until uniformly mixed, and packaged, to prepare a liquid material;

Example 4 The anti-carbonization waterproofing paste of the present invention was prepared according to the following formulation and procedure:

(1) Accurately weigh the following materials according to the ratio:

Material

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(2) The carbonization inhibitor is prepared by the following steps: Using a pressure-shrinking J air atomization technology, the mineral oil is atomized first in the atomization chamber at a pressure of 0.6 MPa; then the calcium oxide and calcium-based montmorillonite powder are formulated according to the formula. Put in high ban.

Mixing uniformly in the speed mixer to obtain a mixture powder of calcium oxide and calcium-based montmorillonite powder; then passing the prepared mixture powder through the feed port, entering the atomization chamber, and staying for 3 seconds, obtaining the carbonization inhibition of the tomb bay Agent

(3) Put the materials of cement, quartz powder, etc. of component A into a high-speed dispersing machine, stir for 2 minutes, until the mixture is evenly mixed, and the mixture can be made into powder;

(4) Accurately weigh the B component according to the above mixture ratio, pour the emulsion, water and other materials into the liquid mixer, stir for 3 minutes, until the mixture is evenly mixed, and then the liquid material can be prepared;

(5) The powder product and the liquid product are uniformly mixed in a ratio of 1:0.3 to obtain an anti-carbonization waterproof slurry.

Example 5 The anti-carbonization waterproofing paste of the present invention was prepared according to the following formulation and procedure:

(1) Accurately weigh the following materials according to the ratio:

i 1 dimension l barrier; cyst base Φ base f fiber optic discussion i , s :

(2) The carbonization inhibitor is prepared by the following steps: ultrasonic atomization is carried out at 50 kHz, and the mineral oil is atomized in the atomization chamber; then the calcium oxide and calcium-based montmorillonite powder are placed in the high-speed mixer according to the formulation ratio. Mixing uniformly, obtaining a mixture powder of calcium oxide and calcium-based montmorillonite powder; then passing the prepared mixture powder through the feed port, entering the atomization chamber, and staying for 6 seconds to obtain a carbonization inhibitor;

(3) Put the materials of cement, quartz powder, etc. of component A into a high-speed dispersing machine, stir for 2-3 minutes, until the mixture is evenly mixed, and the mixture can be made into powder;

(4) Accurately weigh the B component according to the above mixing ratio, pour the emulsion, water and other materials into the liquid mixer, stir for 2-3 minutes, until the mixture is evenly mixed, and then the liquid material can be prepared;

Claims

Quanhe iJ request

An anti-carbonization waterproofing paste characterized in that it consists of two components A and B, and the components A and B are composed of the following parts by weight:

Component A

Cement 250-600 parts

Quartz powder 250-500 parts

Redispersible latex powder 5-20 parts

Cellulose ether 0.5-5 parts

Superplasticizer 0.5-4 parts

Water repellent 0.3-5 parts

50-100 parts of carbonization inhibitor,

Component B

Emulsion 200-500 parts

Water 400-800 parts

Defoamer 0.5-10 parts

Preservative 0.5-10 parts.

2. The anti-carbonization waterproofing paste according to claim 1, wherein: the carbonization inhibitor active ingredient is a mixture of calcium oxide and calcium-based montmorillonite powder, and the calcium oxide and calcium-based montmorillonite powder are in accordance with : 1-3: 1 ratio mixing.

The anti-carbonization waterproofing paste according to claim 1 or 2, wherein: the carbonization inhibitor is a modified product of a mixture of calcium oxide and calcium-based montmorillonite powder modified by mineral oil, The mixture of calcium oxide and calcium-based montmorillonite powder is attached to the atomized particles of the mineral oil in the form of aggregates or is surrounded by mineral oil particles to form granular microspheres.

The anti-carbonization waterproofing paste according to claim 1 or 2 or 3, wherein the carbonization inhibitor is prepared by the following steps:

(3) The mixture powder obtained in the step (2) is passed through the feed port, enters the atomization chamber, and is left for 1-10 seconds to obtain a carbonization inhibitor.

The anti-carbonization waterproofing paste according to claim 1 or 2 or 3 or 4, wherein the calcium oxide index is as follows: CaO content is greater than or equal to 95%, and activity degree is at least 400 ml/4 NHu in 10 minutes. The particle size is above 200 mesh; the calcium-based montmorillonite powder has the following indexes: particle size: 95% less than 200 micrometers, 105 °C volatile matter less than 5%, expansion capacity greater than 95 ml/g, and 4% viscosity greater than 25 °C 3000mpa · s.

The anti-carbonization waterproofing slurry according to claim 1, wherein: the cement is Portland cement or ordinary Portland cement having a strength grade of 42.5 or 42.5R or 52.5; 100-400 mesh quartz powder.

The anti-carbonization waterproofing paste according to claim 1, wherein the dispersible polymer powder is an ethylene-vinyl acetate copolymer latex powder or an acrylic latex powder.

The anti-carbonization waterproofing paste according to claim 1, wherein the cellulose ether is hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 500. -lOOOOOPa · s.

The anti-carbonization waterproofing paste according to claim 1, wherein the emulsion is a carboxylated styrene butadiene latex or an acrylic emulsion or a styrene-acrylic emulsion, and has a solid content of 45 to 58%.

The anti-carbonization waterproofing paste according to claim 1, wherein the preservative is an active component of isothiazolinone BIT 20% dispersion.