Cement composite material for mortar with high anti-cracking and anti-bending strength and its preparation method

Abstract

The present application relates to a kind of cement composite for anti-cracking, anti-bending strength mortar, it is first using the component including triethylene glycol, dodecanedioic acid, polypropylene glycol, 2-naphthylamine-1, 5-disulfonic acid, 1, 4-butanediol-2-sodium sulfonate, citric acid, triethanolamine to prepare special toughness structure, hydrophilic polymer polyester resin, then it is fully mixed with cement clinker, gypsum, blast furnace slag and coal gangue powder etc., powder preparation is obtained.The cement product prepared in the present application contains organic polymer polyester resin that can be hydrated and dispersed, the mortar material prepared by using the cement product of the present application not only has excellent anti-cracking performance, but also has high bending strength, which is much better than ordinary cement, and can be used in the field of cement mortar material with high requirements for anti-cracking and bending strength.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement, in particular to a cement composite material with high anti-cracking and anti-bending strength for mortar and a preparation method thereof. BACKGROUND

[0002] Cement mortar plate can be prepared only by cement and sand, and people can prepare relevant cement mortar plate materials by themselves in rural areas and other areas with poor basic conditions. The cement mortar plate has the advantages of simple formula, convenient process, no insect breeding and good corrosion resistance, and is widely used in fields with low strength requirements. However, the cement mortar plate has defects such as brittleness, easy cracking under long-time stress and low anti-bending strength, which limits its application in many load-bearing table surfaces and long-span table surfaces. Although some studies have modified the prepared cement mortar plate, the modification process requires high equipment, which is not suitable for preparation in the relatively weak basic conditions of farmers' homes. Therefore, how to modify the cement composition to develop a cement composite material with high anti-cracking and anti-bending strength, and then compound it with sand and water to prepare a cement mortar material with high anti-cracking and anti-bending strength is an urgent problem to be solved. SUMMARY

[0003] To solve the above problems, the present application develops a cement composite material with high anti-cracking and anti-bending strength. The cement composite material is prepared by mixing and grinding inorganic main materials and functional polyester resin components. The functional components include components such as triethylene glycol, dodecanedioic acid, polypropylene glycol, 2-naphthylamine-1,5-disulfonic acid, 1,4-butanediol-2-sodium sulfonate, citric acid and triethanolamine. The cement clinker, gypsum, blast furnace slag and coal gangue powder are fully mixed and ground to obtain the cement product. The cement product prepared by the present application contains organic polyester resin which can be hydrated and dispersed. The mortar material prepared by using the cement product of the present application has excellent anti-cracking performance and high anti-bending strength, which is much better than ordinary cement, and can be used in cement mortar materials with high anti-cracking and anti-bending strength requirements.

[0004] A cement composite material with high anti-cracking and anti-bending strength for mortar is prepared by fully mixing and grinding inorganic main materials and functional polyester resin components. The functional components include the following raw materials in mole:

[0005]

[0006] The components also include a catalyst and an antioxidant.

[0007] Preferably, the cement composite material for anti-cracking and high flexural strength mortar as described above, the hydroxyl value of polypropylene glycol is 68-83 mgKOH / g, the molecular weight is about 1500, and the model can be PPG-1500, which can be purchased from Jiangsu Hai'an Petrochemical Factory; the catalyst is monobutyl tin oxide, and the amount is 0.5-0.8% of the mass of triethylene glycol; the antioxidant is antioxidant 1010, and the amount is 1-1.5% of the mass of triethylene glycol.

[0008] The cement composite material for anti-cracking and high flexural strength mortar as described above, the inorganic main material of the cement composite material comprises the following raw materials in mass parts:

[0009]

[0010] The cement composite material for anti-cracking and high flexural strength mortar as described above, the mass ratio of functional polyester resin to inorganic main material is 1:8.5-9.0.

[0011] A method for preparing the cement composite material for anti-cracking and high flexural strength mortar as described above, comprising the following steps:

[0012] A, the formula amount of triethylene glycol, polypropylene glycol and catalyst are added into the reaction kettle, heated to 120-130℃, then the formula amount of dodecanedioic acid and 2-naphthylamine-1, 5-disulfonic acid are added for esterification polymerization reaction, gradually heated to 210-215℃, and the esterification polymerization reaction is carried out under insulation;

[0013] B, the acid value of the polymer is detected by sampling, when the acid value of the polymer reaches 50-60 mgKOH / g, the formula amount of 1, 4-butanediol-2-sodium sulfonate and citric acid is added, and the temperature is raised to 225-230℃ for chain extension polymerization reaction;

[0014] C, the acid value of the polymer is detected by sampling, when the acid value of the polymer reaches 28-35 mgKOH / g, the formula amount of antioxidant is added, then the vacuum system is started, and the vacuum high molecular polycondensation reaction is continued under insulation at 225-230℃;

[0015] D, when the acid value of the polymer reaches 10-15 mgKOH / g, the vacuum system is removed, the formula amount of triethanolamine is added for hydroxyl end-capping reaction of the polymer, when the acid value of the polymer reaches below 2 mgKOH / g, the reaction is stopped and the material is discharged at high temperature, the polymer is cooled and crushed to obtain polyester resin granules, which are ready for use;

[0016] E, the formula amount of cement clinker, gypsum, coal gangue powder, blast furnace slag and polyester resin granules obtained in step D are mixed in a mixer, and after uniform mixing, they are sent to a grinding mill for grinding treatment, and then sieved to obtain a cement composite material product.

[0017] Preferably, in step A, the temperature is gradually increased to 210-215°C at a rate of 13-15°C / h; in step C, the vacuum degree of the vacuum system is controlled between -0.097 Mpa and -0.099 Mpa; in step D, the cooling is steel belt cooling; in step E, the specific surface area of the final cement composite product is ≥300 m 2 / kg.

[0018] For example, a method for preparing a cement composite for mortar with high anti-cracking and anti-bending strength, comprising the following steps:

[0019] A. A formula amount of triethylene glycol, polypropylene glycol and catalyst is added to a reaction kettle, the temperature is increased to 120-130°C, then a formula amount of dodecanedioic acid and 2-naphthylamine-1,5-disulfonic acid is added for esterification and polymerization reaction, the temperature is gradually increased to 210-215°C at a rate of 13-15°C / h, and the esterification and polymerization reaction is carried out under heat preservation;

[0020] B. The acid value of the polymer is detected by sampling, when the acid value of the polymer reaches 50-60 mgKOH / g, a formula amount of 1,4-butanediol-2-sodium sulfonate and citric acid is added, and the temperature is increased to 225-230°C for chain extension polymerization reaction;

[0021] C. The acid value of the polymer is detected by sampling, when the acid value of the polymer reaches 28-35 mgKOH / g, a formula amount of antioxidant is added, then the vacuum system is started, the vacuum degree is controlled between -0.097 Mpa and -0.099 Mpa, and the vacuum high polymer condensation reaction is continued under heat preservation at 225-230°C;

[0022] D. When the acid value of the polymer reaches 10-15 mgKOH / g, the vacuum system is removed, a formula amount of triethanolamine is added as a dispersant and grinding aid for hydroxyl end-capping reaction of the polymer, when the acid value of the polymer reaches below 2 mgKOH / g, the reaction is stopped and high-temperature discharge is carried out, the polymer is cooled by steel belt, crushed to obtain polyester resin granules, which are ready for use;

[0023] E. A formula amount of cement clinker, gypsum, coal gangue powder, blast furnace slag and polyester resin granules obtained in step D are thoroughly mixed in a mixer, then uniformly mixed and sent to a grinding mill for grinding treatment, and then sieved to obtain a cement composite product with a specific surface area ≥300 m 2 / kg.

[0024] Beneficial effects:

[0025] The present application relates to a kind of cement composite for mortar with anti-cracking, high flexural strength, which is prepared by dispersing inorganic main materials including cement clinker, gypsum, blast furnace slag and coal gangue powder, and raw materials including triethylene glycol, dodecanedioic acid, polypropylene glycol, 2-naphthylamine-1,5-disulfonic acid, 1,4-butanediol-2-sodium sulfonate, citric acid and triethanolamine after polymerization reaction.The special tough structure and hydrophilic polymer polyester resin are first synthesized and prepared, and then mixed with cement clinker, gypsum, blast furnace slag and coal gangue powder to obtain the cement composite.The cement product prepared by the present application contains organic polymer polyester resin which can be hydrated and dispersed, and the mortar material prepared by using the cement product has excellent anti-cracking performance and high flexural strength, which is much better than ordinary cement, and can be used in the field of cement mortar material with high requirements for anti-cracking and flexural strength. DETAILED DESCRIPTION

[0026] The present application will be further described below with reference to examples.It should be noted that the examples and technical features in the examples in the present application can be combined with each other without conflict.It should be noted that all technical and scientific terms used in the present application have the same meaning as generally understood by ordinary skilled in the art to which the present application belongs.The present application discloses that "including" or "containing" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects.

[0027] The raw materials in the present application are commercially available.For example, polypropylene glycol has a hydroxyl value of 68-83 mg KOH / g, a molecular weight of about 1500, and a model number of PPG-1500, which is purchased from Jiangsu Hai'an Petrochemical Factory.

[0028] Example 1

[0029] A cement composite for mortar with anti-cracking and high flexural strength is prepared by mixing and grinding inorganic main materials and functional polyester resin components;the functional components include raw materials with the following molar proportions:

[0030]

[0031] The catalyst is monobutyl tin oxide, and the amount is 0.8% of the mass of triethylene glycol.

[0032] The antioxidant is antioxidant 1010, and the amount is 1.5% of the mass of triethylene glycol.

[0033] A cement composite for mortar with anti-cracking and high flexural strength as described above, wherein the inorganic main materials of the cement composite include raw materials with the following mass proportions:

[0034]

[0035] A cement composite material for mortar with high anti-cracking and anti-bending strength, the mass ratio of the functional polyester resin to the inorganic main material is 1:9.0.

[0036] A preparation method of the cement composite material for mortar, comprising the following steps:

[0037] A. A formula amount of triethylene glycol, polypropylene glycol and catalyst are added into a reaction kettle, and heated to 130℃, then a formula amount of dodecanedioic acid and 2-naphthylamine-1, 5-disulfonic acid are added to carry out esterification polymerization reaction, and the temperature is gradually increased to 215℃ at a rate of 15℃ / h, and the esterification polymerization reaction is carried out under heat preservation;

[0038] B. When the acid value of the polymer reaches 57mgKOH / g, a formula amount of 1, 4-butanediol-2-sodium sulfonate and citric acid are added, and the temperature is increased to 230℃ to carry out chain extension polymerization reaction;

[0039] C. When the acid value of the polymer reaches 33mgKOH / g, a formula amount of antioxidant is added, then the vacuum system is started, the vacuum degree is controlled at-0.099Mpa, and the vacuum high polymer polycondensation reaction is carried out under heat preservation at 230℃;

[0040] D. When the acid value of the polymer reaches 13mgKOH / g, the vacuum system is removed, a formula amount of triethanolamine is added as a dispersant and grinding aid for the polymer to carry out hydroxyl end-capping reaction, when the acid value of the polymer reaches 2mgKOH / g or below, the reaction is stopped and high-temperature discharge, the polymer is cooled by steel belt, crushed to obtain polyester resin particles, which are ready for use;

[0041] E. A formula amount of cement clinker, gypsum, coal gangue powder, blast furnace slag and polyester resin particles obtained in the D step are fully mixed in a mixer, and after uniform mixing, they are sent to a grinding mill for grinding treatment, and then sieved to obtain a cement composite material product with a specific surface area of ≥300m 2

[0042] Example 2

[0043] A cement composite material for mortar with high anti-cracking and anti-bending strength, the cement composite material is prepared by fully mixing and grinding an inorganic main material and a functional polyester resin component; the functional component comprises raw materials in the following molar parts:

[0044]

[0045] The catalyst is monobutyl tin oxide, and the amount is 0.7% of the mass of triethylene glycol; ​

[0046] Antioxidant is antioxidant 1010, the amount is 1.5% of the mass of triethylene glycol.

[0047] A cement composite material for mortar with high anti-cracking and anti-bending strength, the inorganic main material of the cement composite material comprises the following raw materials in mass parts:

[0048]

[0049] A cement composite material for mortar with high anti-cracking and anti-bending strength, the mass ratio of the functional polyester resin and the inorganic main material is 1:8.8.

[0050] The preparation method is the same as that of Example 1.

[0051] Example 3

[0052] A cement composite material for mortar with high anti-cracking and anti-bending strength, the cement composite material is prepared by fully mixing and grinding the inorganic main material and a functional polyester resin component; the functional component comprises the following raw materials in mole parts:

[0053]

[0054] The catalyst is monobutyl tin oxide, and the amount is 0.7% of the mass of triethylene glycol;

[0055] The antioxidant is antioxidant 1010, the amount is 1.5% of the mass of triethylene glycol.

[0056] A cement composite material for mortar with high anti-cracking and anti-bending strength, the inorganic main material of the cement composite material comprises the following raw materials in mass parts:

[0057]

[0058] A cement composite material for mortar with high anti-cracking and anti-bending strength, the mass ratio of the functional polyester resin and the inorganic main material is 1:8.5.

[0059] The preparation method is the same as that of Example 1.

[0060] Example 4

[0061] A cement composite material for mortar with high anti-cracking and anti-bending strength, the cement composite material is prepared by fully mixing and grinding the inorganic main material and a functional polyester resin component; the functional component comprises the following raw materials in mole parts:

[0062]

[0063] The catalyst is monobutyl tin oxide, and the amount is 0.8% of the mass of triethylene glycol;

[0064] The antioxidant is antioxidant 1010, and the amount is 1.2% of the mass of triethylene glycol.

[0065] The cement composite material for mortar with high anti-cracking and anti-bending strength as described above, the inorganic main material of the cement composite material comprises raw materials in the following mass parts:

[0066]

[0067] The cement composite material for mortar with high anti-cracking and anti-bending strength as described above, the mass ratio of the functional polyester resin to the inorganic main material is 1:9.0.

[0068] The preparation method is the same as that in Example 1.

[0069] Comparative Example 1: A commercially available ordinary P·O 42.5 Portland cement is used as a comparative example.

[0070] Test method:

[0071] The anti-bending strength test is performed according to the anti-bending strength test in Part 10.1 of GB / T 17671-2021 “Cement mortar strength test method (ISO method)”; the anti-cracking performance is tested according to the building material industry standard JC / T 951-2005 “Cement mortar anti-cracking performance test method”; the anti-freezing and thawing test is performed by using the fast freezing method in the “Standard for testing long-term performance and durability of ordinary concrete” (GB / T 50082-2009), and the number of freezing and thawing cycles is 50, and the surface crack condition is tested.

[0072] The test results of the concrete panels prepared in the above examples and comparative examples are shown in Table 1 below.

[0073] Table 1 Performance test of concrete panels

[0074]

[0075] As can be seen from Table 1, the cement mortar material prepared by the product of the application due to the participation of the special structure of the hydrophilic polyester resin, the anti-bending strength is significantly improved, the anti-bending strength is basically more than twice that of ordinary cement mortar material, and the anti-cracking performance is also significantly improved, not only the surface is almost free of cracks, but also compared with the benchmark cement mortar of Comparative Example 1, the anti-cracking performance reaches more than 94%. The surface of the prepared cement mortar material is still free of obvious cracks after 50 cycles of freezing and thawing test, which shows that the polyester resin as a tough material improves the inherent toughness of the cement mortar material, while the benchmark cement mortar material of Comparative Example 1 has serious surface cracks after 50 cycles of freezing and thawing test, and a slight pulverization phenomenon appears. Therefore, the cement composite material prepared by the application has excellent anti-cracking and anti-bending performance.

[0076] The foregoing merely illustrates some exemplary embodiments of the application, and it will be appreciated that those skilled in the art will be able to devise various modifications without departing from the spirit and scope of the application. The described embodiments are to be considered in all respects as illustrative only and not restrictive in character, and the scope of the application is indicated not by the foregoing description but by the claims that follow.

Claims

1. A cement composite material for mortar with excellent crack resistance and flexural strength, characterized in that: The cement composite is prepared by fully mixing and grinding an inorganic main material and a functional polyester resin component; the functional polyester resin component includes the following raw materials in molar parts: Catalyst monobutyltin oxide, the dosage is 0.5-0.8% of the mass of triethylene glycol; Antioxidant 1010, the dosage is 1-1.5% of the mass of triethylene glycol; Among them, the hydroxyl value of polypropylene glycol is 68-83 mgKOH / g, and the model is PPG-1500; The inorganic main material of the cement composite material includes the following raw materials in parts by weight: The mass ratio of functional polyester resin to inorganic main material is 1:8.5-9.0; The preparation method of a cement composite material for mortar with excellent crack resistance and flexural strength comprises the following steps: A. Add the formulated amount of triethylene glycol, polypropylene glycol and catalyst into a reaction kettle, raise the temperature to 120-130°C, then add the formulated amount of dodecanedioic acid and 2-naphthylamine-1,5-disulfonic acid to carry out esterification polymerization reaction, gradually raise the temperature to 210-215°C, and carry out esterification polymerization reaction while maintaining the temperature; B. Take samples to test the acid value of the polymer. When the acid value of the polymer reaches 50-60 mgKOH / g, add the formulated amount of 1,4-butanediol-2-sulfonic acid sodium salt and citric acid, and heat to 225-230°C to carry out chain extension polymerization reaction; C. Take samples to test the acid value of the polymer. When the acid value of the polymer reaches 28-35 mgKOH / g, add the formulated amount of antioxidant, then start the vacuum system and continue to keep the temperature at 225-230°C for vacuum polymer polycondensation reaction; D. When the acid value of the polymer reaches 10-15 mgKOH / g, release the vacuum system and add the formulated amount of triethanolamine to perform hydroxyl end-capping reaction on the polymer. When the acid value of the polymer reaches below 2 mgKOH / g, stop the reaction and discharge the material at high temperature. The polymer is cooled and crushed to obtain functional polyester resin particles for standby use. E. The cement clinker, gypsum, coal gangue powder, blast furnace slag and the functional polyester resin particles obtained in step D are fully mixed in a mixer, and after mixing evenly, the mixture is sent to a powder mill for grinding, and then sieved to obtain a cement composite product.

2. A cement composite material for mortar with excellent crack resistance and flexural strength as claimed in claim 1, characterized in that: In step A of the preparation method, the temperature is gradually increased to 210-215° C. at a heating rate of 13-15° C. / h.

3. A cement composite material for mortar with excellent crack resistance and flexural strength as claimed in claim 1, characterized in that: In step C of the preparation method, the vacuum degree of the vacuum system is controlled between -0.097 MPa and -0.099 MPa; in step D, the cooling is steel strip cooling.

4. A cement composite material for mortar with excellent crack resistance and flexural strength as claimed in claim 1, characterized in that: In step E of the preparation method, the specific surface area of ​​the final cement composite product is ≥300m 2 / kg.

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