1. A quick-drying polymer cement waterproof slurry is characterized by comprising a liquid material and a powder material;

the liquid material comprises: butylbenzene emulsion and film forming auxiliary agent;

the powder material comprises: calcium oxide, aluminum powder, iron powder, sodium carbonate, calcium chloride, aluminum oxide clinker and activated carbon.

2. The quick setting polymer cement waterproofing slurry according to claim 1,

the mass ratio of the butylbenzene emulsion to the film-forming additive is (20-40): (0.5-1);

the mass ratio of the calcium oxide, the aluminum powder, the iron powder, the sodium carbonate, the calcium chloride, the aluminum oxide clinker and the active carbon is (2-4): (0.8-1.2): (2-5): (0.4-0.6): (0.2-0.4): (1-4): (1-2).

3. The quick setting polymer cement waterproofing slurry according to claim 1,

the liquid material also comprises: water, defoaming agent, mildew preventive;

the powder further comprises: cement, coarse whiting, quartz sand and water reducing agent.

4. The quick setting polymer cement waterproofing slurry according to claim 3,

the mass ratio of the butylbenzene emulsion to the water to the antifoaming agent to the film-forming assistant to the mildew preventive is (20-40): (60-80): (0.3-0.6): (0.5-1): (0.1-0.3);

the mass ratio of the ash cement, the coarse whiting, the quartz sand, the calcium oxide, the aluminum powder, the iron powder, the sodium carbonate, the calcium chloride, the aluminum oxide clinker, the active carbon and the water reducing agent is (30-50): (20-40): (30-40): (2-4): (0.8-1.2): (2-5): (0.4-0.6): (0.2-0.4): (1-4): (1-2): (0.1-0.3).

5. The quick setting polymer cement waterproofing slurry according to any one of claims 1 to 4,

the butylbenzene emulsion is BASF 7623 emulsion;

the film-forming aid is Texanol film-forming aid.

6. The quick setting polymer cement waterproofing slurry according to any one of claims 1 to 4,

the particle size of the calcium oxide is 350-450 meshes;

the particle size of the aluminum powder is 200-300 meshes;

the particle size of the iron powder is 200-300 meshes;

the aluminous clinker is CA-100L aluminous clinker in the sea rock industry;

the particle size of the activated carbon is 350-450 meshes.

7. The quick-drying polymer cement waterproofing slurry according to claim 3 or 4,

the defoaming agent is an organic silicon defoaming agent;

the mildew preventive is a Kathon mildew preventive.

8. The quick-drying polymer cement waterproofing slurry according to claim 3 or 4,

the cement is 42.5 cement;

the particle size of the coarse whiting is 250-300 meshes;

the particle size of the quartz sand is 70-140 meshes;

the water reducing agent is a chemical SSJS water reducing agent in the same boat.

9. The quick-drying polymer cement waterproof slurry according to any one of claims 1 to 4, wherein the mass ratio of the liquid material to the powder material is 1: (2.5-3.5).

10. A method of preparing a quick drying polymer cement waterproofing slurry according to any of claims 1 to 9, characterized in that the method of preparation comprises:

uniformly mixing all components in the liquid material to obtain a liquid material;

and uniformly mixing all the components in the powder to obtain the powder.

Background

The polymer cement waterproof slurry is a bi-component waterproof slurry which is compounded by a liquid material and matched powder material (consisting of special cement, quartz powder and various additives), wherein the liquid material is formed by optimally combining synthetic high-molecular polymer emulsion (such as polyacrylate, polyvinyl acetate, styrene butadiene rubber emulsion and the like) and various additives, and the bi-component waterproof slurry has certain flexibility and is a waterproof material which not only has the water resistance of a synthetic high-molecular polymer material, but also has good durability of an inorganic material.

The curing mechanism is as follows: in the polymer-cement composite system, as the hydration of cement proceeds, the cement absorbs the water in the polymer emulsion in the coating to generate products such as hydrated calcium silicate, ettringite, calcium hydroxide and the like, the other part of water in the latex volatilizes to the atmosphere, the dehydrated polymer particles gradually approach to each other and are finally connected with each other to form a film or a network around and on the surface of the cement hydration product, the polymer flexible network with cohesiveness and elastoplasticity bites the cement hydration particles in the coagulation system and coarse and fine aggregates to form strong adhesion, and finally the polymer cement mortar with the functions of preventing the occurrence of micro cracks and preventing the expansion of cracks is formed.

The polymer cement waterproof slurry is a volatilization curing type water-based slurry, the drying speed of the water-based slurry depends on the volatilization rate of water in the slurry, and compared with a solvent-based slurry, the evaporation heat of water is higher, so the evaporation speed of water under the same condition is more than ten times or even more than ten times slower than that of the solvent-based slurry, and particularly, the volatilization speed of water in a slurry system is further retarded under the low-temperature or high-humidity environment, so that the problem that the drying speed of the slurry is slow or even not dry can be caused.

The temperature is an important influence factor influencing the curing speed of the polymer cement waterproof slurry coating, and the increase of the temperature can effectively accelerate the evaporation efficiency of water in the slurry and improve the curing speed of the coating. However, the curing temperature should not exceed 50 ℃, otherwise, the water is evaporated too fast, which may cause the problems of swelling, warping, cracking, discoloration and the like of the waterproof coating.

Disclosure of Invention

The invention aims to solve the problems of slow moisture volatilization and long drying time of a polymer cement waterproof slurry product in a low-temperature and high-humidity environment, and provides a preparation method of a polymer cement waterproof slurry, which can realize quick drying even in the low-temperature and high-humidity environment. By adding special chemical substances into the formula, the aim of improving the curing temperature of a waterproof slurry product system in the application process is fulfilled, the rapid volatilization of water is realized, and meanwhile, the special polymer emulsion and the cement accelerator are matched, so that the effect of quickly drying the slurry is achieved, and the construction efficiency of workers can be effectively improved.

In order to accomplish the above object, a first aspect of the present invention provides a quick-drying type polymer cement waterproof slurry comprising a liquid material and a powder material;

the liquid material comprises: butylbenzene emulsion and film forming auxiliary agent;

the powder material comprises: calcium oxide, aluminum powder, iron powder, sodium carbonate, calcium chloride, aluminum oxide clinker and activated carbon.

Preferably, the mass ratio of the butylbenzene emulsion to the film-forming assistant is (20-40): (0.5-1).

Preferably, the mass ratio of the calcium oxide, the aluminum powder, the iron powder, the sodium carbonate, the calcium chloride, the aluminous clinker and the activated carbon is (2-4): (0.8-1.2): (2-5): (0.4-0.6): (0.2-0.4): (1-4): (1-2).

As a further preferred embodiment of the process,

the liquid material also comprises: water, defoaming agent, mildew preventive;

the powder further comprises: cement, coarse whiting, quartz sand and water reducing agent.

As a further preferable scheme, the mass ratio of the butylbenzene emulsion to the water to the antifoaming agent to the film-forming assistant and the mildew preventive is (20-40): (60-80): (0.3-0.6): (0.5-1): (0.1-0.3).

As a further preferable scheme, the mass ratio of the ash cement, the heavy calcium carbonate, the quartz sand, the calcium oxide, the aluminum powder, the iron powder, the sodium carbonate, the calcium chloride, the aluminum oxide clinker, the activated carbon and the water reducing agent is (30-50): (20-40): (30-40): (2-4): (0.8-1.2): (2-5): (0.4-0.6): (0.2-0.4): (1-4): (1-2): (0.1-0.3).

In particular, in order to reduce the actual drying time even further, for the powder lot, the mass ratio of the cement ash, the coarse whiting, the quartz sand, the calcium oxide, the aluminum powder, the iron powder, the sodium carbonate, the calcium chloride, the aluminous clinker, the activated carbon and the water reducing agent is (30-50): (20-40): (30-40): (2-4): (0.8-1.2): (3-4): (0.4-0.6): (0.2-0.4): (2-3.5): (1-2): (0.1-0.3).

According to the invention, the styrene-butadiene emulsion can be selected from styrene-butadiene emulsions conventionally adopted by a person skilled in the art, and as a preferred scheme, the styrene-butadiene emulsion is BASF 7623 emulsion, and the emulsion has the characteristics of small particle size, low film-forming temperature, low water absorption and the like, and has a faster film-forming rate compared with styrene-acrylic emulsion and VAE emulsion with the same performance.

According to the invention, the film-forming assistant can be a film-forming assistant conventionally adopted by a person skilled in the art, and as a preferable scheme, the film-forming assistant is Texanol film-forming assistant.

According to the invention, the calcium oxide can be calcium oxide conventionally adopted by a person skilled in the art, and preferably, the particle size of the calcium oxide is 350-450 meshes, such as 400 meshes.

Preferably, the particle size of the aluminum powder is 200-300 meshes.

Preferably, the particle size of the iron powder is 200-300 meshes.

Preferably, the aluminous clinker is CA-100L aluminous clinker in Haishixing industry;

according to the invention, the activated carbon can be selected from activated carbon conventionally adopted by a person skilled in the art, and as a preferable scheme, the particle size of the activated carbon is 350-450 meshes, for example, the activated carbon with the particle size of 400 meshes is selected.

According to the invention, the defoaming agent can be selected from defoaming agents conventionally adopted by a person skilled in the art, and preferably, the defoaming agent is an organic silicon defoaming agent, such as a Wake SILFOAM SC-120 organic silicon defoaming agent.

According to the invention, the mildew preventive can be a mildew preventive conventionally adopted by a person skilled in the art, and preferably, the mildew preventive is a cason mildew preventive.

Preferably, the cement is 42.5 cement, such as 42.5 cement (MMA).

Preferably, the particle size of the heavy calcium is 250-300 meshes, for example, the particle size of the heavy calcium is 280 meshes.

Preferably, the particle size of the quartz sand is 70-140 meshes.

As a preferred scheme, the water reducing agent is a chemical SSJS water reducing agent in the same boat.

Preferably, in the quick-drying polymer cement waterproof slurry, the mass ratio of the liquid material to the powder material is 1: (2.5-3.5).

A second aspect of the present invention provides a method for preparing the above-mentioned quick-drying polymer cement waterproof slurry, which comprises:

uniformly mixing all components in the liquid material to obtain a liquid material;

and uniformly mixing all the components in the powder to obtain the powder.

The innovation points (or improvement points) of the invention are as follows:

1. the powder material of the formula contains a certain amount of quicklime (CaO), and the quicklime can generate calcium hydroxide after being mixed and contacted with water in the liquid material. In the process, a large amount of heat can be released, the temperature of the product in the using process is improved, and the volatilization rate of water in the slurry is increased, which is a main factor for realizing quick drying of the waterproof slurry;

2. the aluminum powder and the iron powder are added into the powder material in the formula, so that a galvanic cell effect can be formed with the activated carbon, moisture and salt in the formula, heat is released through an oxidation-reduction reaction, the temperature of the product in the using process is improved, and the volatilization rate of moisture in the slurry is increased, which is another main factor for realizing quick drying of the waterproof slurry;

3. the aluminum powder added into the powder material in the formula can react with strong alkali and release heat, so that the volatilization rate of water in the slurry is increased;

4. the aluminum oxide clinker (the main component is sodium aluminate) is added into the powder material in the formula, so that the hydration rate of cement can be promoted, and the drying rate of slurry can be accelerated;

5. the components such as sodium carbonate, calcium chloride and the like are added into the powder material in the formula, and the powder material is mainly used for absorbing trace moisture permeating into a package, preventing the calcium oxide from losing efficacy gradually, and playing an auxiliary role in chemical reaction and releasing heat;

6. the special styrene-butadiene emulsion is selected as the main film forming material of the waterproof coating film, and the emulsion has the characteristics of small particle size, low film forming temperature, low water absorption and the like, and has higher film forming rate compared with styrene-acrylic emulsion and VAE emulsion with the same performance;

the key technical principle of the invention is as follows:

1. quick lime and water react rapidly to generate calcium hydroxide and release a large amount of heat, so that the temperature of a slurry system in the application process is rapidly increased, the volatilization of water in the slurry is accelerated, and the quick drying of the slurry is realized;

CaO+H₂O＝Ca(OH)₂+ Heat quantity

2. The iron powder and the aluminum powder and electrolytes such as activated carbon and sodium chloride in the formula form a 'primary battery' effect, so that an oxidation-reduction reaction occurs, heat is released, the reaction lasts for a long time, the high temperature of the slurry can be effectively kept for a long time in the drying process, the time for rapidly volatilizing water in the slurry is prolonged, and the quick drying of the slurry is realized;

(Positive electrode) O₂+2H₂O+4e^-＝4OH^-(negative electrode) Fe-2e^-＝Fe²⁺

(Positive electrode) O₂+2H₂O+4e^-＝4OH^-(negative electrode) Al-3e^-＝Al³⁺

3. The formula contains a large amount of substances such as cement, quicklime and the like, the system is strong alkaline, aluminum powder reacts with the strong alkaline to produce meta-aluminate and hydrogen, heat is released, volatilization of moisture in the slurry is accelerated, and quick drying of the slurry is realized; on the other hand, the produced meta-aluminate reacts with gypsum in cement, so that the gypsum loses the original retarding effect and the hydration speed of the cement is accelerated, and the quick drying of the slurry is realized;

Al+OH^-＝AlO₂ ^-+H²+ Heat quantity

AlO₂ ^-+H₂O＝Al(OH)₃+OH^-，OH^-+CaSO₄＝Ca(OH)₂+Na₂SO₄

4. Calcium hydroxide and sodium carbonate react to produce calcium carbonate and sodium hydroxide and release heat, and play an auxiliary role in other chemical reactions, thus being beneficial to the other chemical reactions;

Ca(OH)₂+Na₂CO₃＝CaCO₃+2NaOH + Heat

Calcium chloride and sodium hydroxide react to generate calcium hydroxide and sodium chloride and release heat, and the generated sodium chloride is used as electrolyte in the primary battery effect;

CaCl₂+2NaOH＝Ca(OH)₂+2NaCl + Heat

5. The main component of the aluminous clinker is sodium aluminate, and the aluminous clinker reacts with gypsum in cement in an alkaline solution rapidly to form sodium sulfate, so that the gypsum loses the original slow setting effect, calcium aluminate minerals are rapidly hydrated, and hydrated product crystals of the calcium aluminate minerals are separated out from the solution, thereby accelerating the hydration speed of the cement and realizing the quick drying of the slurry;

AlO₂ ^-+H₂O＝Al(OH)₃+OH^-，OH^-+CaSO₄＝Ca(OH)₂+Na₂SO₄

6. the invention adopts the butylbenzene emulsion as the film forming matter of the waterproof slurry, has smaller hydration inhibition effect on the early stage of cement than the styrene-acrylic emulsion and the VAE emulsion, has small particle size and low water absorption, is beneficial to realizing quick drying of the waterproof slurry than the styrene-acrylic emulsion and the VAE emulsion, and has certain promotion effect on the drying of the slurry by the film forming auxiliary agent in the formula.

The invention has the beneficial effects that:

the invention provides a preparation method of quick-drying polymer cement waterproof slurry, which achieves the purpose of increasing the curing temperature of a waterproof slurry product system in the application process by adding special chemical components such as calcium oxide, iron powder, aluminum oxide clinker and the like into a formula, thereby realizing the quick volatilization of water, and simultaneously achieving the purpose of quick drying of the slurry by matching with special polymer emulsion and a cement accelerator. The problems of slow moisture volatilization and long drying time of the polymer cement waterproof slurry product in a low-temperature and high-humidity environment are solved, and the construction efficiency of workers can be effectively improved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In the embodiment of the invention, the butylbenzene emulsion is BASF 7623 emulsion, the defoaming agent is Wake SILFOAM SC-120 organic silicon defoaming agent, the film-forming auxiliary agent is Texanol film-forming auxiliary agent, the mildew preventive is Kathon mildew preventive, the cement is 42.5 gray cement (MMA), the coarse whiting is 280 meshes, the particle size of the quartz sand is 70-140 meshes, the particle size of the calcium oxide is 400 meshes of calcium oxide, the particle size of the aluminum powder is 200-300 meshes of aluminum powder, the particle size of the iron powder is 200-300 meshes of sodium carbonate and calcium chloride, the sodium carbonate and the calcium chloride are sodium carbonate and calcium chloride which are conventionally adopted by technical personnel in the field, the aluminous clinker is CA-100L aluminous clinker of Haishiki industry, the active carbon is 400 meshes of active carbon, and the water reducer is SSJS water reducer in the same boat.

TABLE 1

The pulp drying time, the compressive strength, the breaking strength, the transverse deformation capacity and the seepage pressure resistance are tested according to the requirements of JC/T2090-; the temperature of the slurry is tested by adopting an infrared temperature measuring gun under the standard environmental condition, the thickness of a coating film is 1.5mm, and the actual drying time of the common conventional polymer cement waterproof slurry is 2-5h under the environmental conditions of 23 ℃ and 50% humidity according to different formula systems (emulsion type and dosage, cement type and dosage, filler type and dosage, liquid-powder ratio and the like); under the environment conditions of 10 ℃ and 50% humidity, the actual drying time is 5-10 h; the actual drying time is 12-24h under the environment condition of 10 ℃ and 90% humidity.

In examples 1 to 4, the liquid materials were kept consistent, and only the amounts of calcium oxide, iron powder and aluminoxy clinker in the powder materials were distinguished;

compared with the conventional polymer cement waterproof slurry, the initial temperature of the slurry is far higher than the ambient temperature, the slurry keeps consistent with the ambient temperature after 30min, the actual drying time of a coating film is greatly shortened, and the mechanical property of the coating film keeps a higher level.

In the embodiment 2, the amount of calcium oxide is increased compared with the embodiment 1, and the slurry liquid powder is mixed to release more heat, so that the initial temperature of the slurry is greatly increased, the temperature of the coating film is slightly higher than the ambient temperature after 30min, and the actual drying time of the coating film is further shortened compared with the embodiment 1, but various mechanical properties of the coating film are obviously reduced, which shows that the increase of the amount of calcium oxide can accelerate the drying rate of the slurry, but can also greatly affect the mechanical properties of the coating film.

Example 3 has increased the consumption of the iron powder compared with example 2, and the initial temperature after the slurry liquid powder mixes remains basically the same, but the temperature of coating after 30min is obviously higher than example 2, which shows that the iron powder has the characteristics of slow heat release rate but long duration in the slurry system, and has little influence on the mechanical properties.

In example 4, compared with example 3, the amount of the aluminous clinker is increased, the cement hydration rate is accelerated, certain heat is released, the initial temperature after slurry liquid and powder are mixed and the coating temperature after 30min are slightly improved compared with example 3, but the mechanical properties of the components are obviously changed, and the compressive and flexural strength of the slurry coating is improved.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.