Hydration heat inhibitor, preparation method thereof and cement product

Abstract

The invention provides a hydration heat inhibitor. The hydration heat inhibitor comprises the following components in parts by weight: 60-75 parts of a regulator; 5-10 parts by weight of a water reducing agent; 1-5 parts by weight of a reinforcing agent; 3-10 parts by weight of a coagulant; 10-15 parts by weight of a modifier; the regulator is a starch raw material; the modifier comprises one or more of sodium pyrosulfite, sodium sulfite and chlorosulfonic acid. The invention also provides a preparation method of the hydration heat inhibitor and a cement product. The hydration heat inhibitor provided by the invention is suitable for production of mass concrete engineering or thermal insulation building materials, and can greatly reduce a hydration temperature rise peak value of a cement product, adjust a hydration heat release curve of the cement product, inhibit cracking of the cement product and guarantee construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of building material admixtures, and in particular to a hydration heat inhibitor, a preparation method thereof and a cement product. Background Art

[0002] Cement releases a large amount of reaction heat during the hydration process, and the accumulation of reaction heat often has a negative impact on the strength of cement products. Therefore, in large-volume concrete construction, ice cubes or circulating water condensation are generally added to control the reaction heat to ensure construction quality. In the production process of thermal insulation building materials, cement is often used as a binder, but the heat of cement hydration is also easy to accumulate, causing ablation of the board and affecting product quality.

[0003] With the upgrading of research on cement admixtures, researchers have found that starch products can effectively slow down the hydration rate of cement and then control the release of hydration heat. However, the addition of starch products will have a certain negative impact on the curing rate of cement. Therefore, cement products with the addition of starch products often have problems such as prolonged final setting time and reduced production efficiency.

[0004] Therefore, it is of great significance to provide a product that can control the heat of cement hydration and has a higher setting speed. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a hydration heat inhibitor. The hydration heat inhibitor provided by the present application can significantly reduce the hydration temperature rise peak of cement products, adjust the hydration heat release curve of cement products, and has a short final setting time and high strength.

[0006] In view of this, the present application provides a hydration heat inhibitor, comprising:

[0007]

[0008] The regulator is a starch raw material;

[0009] The modifier includes one or more of sodium pyrosulfite, sodium sulfite and chlorosulfonic acid.

[0010] Preferably, the starch raw material includes one or both of starch and maltodextrin.

[0011] Preferably, the enhancer includes one or both of hydroxypropyl methylcellulose and rubber powder; the viscosity of the hydroxypropyl methylcellulose is 1000mPa·s to 200000mPa·s, and the rubber powder includes copolymer rubber powder of vinyl acetate and ethylene, and copolymer rubber powder of acrylate and styrene.

[0012] Preferably, the coagulant comprises one or both of ammonium aluminum sulfate and aluminum sulfate.

[0013] Preferably, the water reducing agent includes one or more of sucrose, glucose and sodium gluconate.

[0014] Preferably, the amount of the regulator added is 65 to 72 parts by weight.

[0015] Preferably, the amount of the modifier added is 12 to 14 parts by weight.

[0016] The present application also provides a method for preparing the hydration heat inhibitor, comprising the following steps:

[0017] According to the ratio, the regulator and the modifier are mixed, and the modified regulator is obtained after sulfonation;

[0018] The modified regulator is mixed with a water reducing agent, a reinforcing agent and a coagulant to obtain a hydration heat inhibitor.

[0019] Preferably, the sulfonation temperature is 50-200° C. and the time is 2-5 hours.

[0020] The present application also provides a cement product, comprising the hydration heat inhibitor or the hydration heat inhibitor prepared by the preparation method.

[0021] The present application provides a hydration heat inhibitor, which includes: 60 to 75 parts by weight of a regulator; 5 to 10 parts by weight of a water reducer; 1 to 5 parts by weight of a reinforcing agent; 3 to 10 parts by weight of a coagulant; and 10 to 15 parts by weight of a modifier. The regulator is a starch raw material; the modifier includes one or more of sodium pyrosulfite, sodium sulfite and chlorosulfonic acid. In the hydration heat inhibitor provided by the present application, the modifier can modify the starch raw material regulator, thereby reducing the influence of the starch raw material on the gel time of cement. At the same time, the introduction of the water reducer and the coagulant can further increase the setting speed of cement, and the reinforcing agent can increase the strength of cement products at various ages. Therefore, the combination of the above components can significantly reduce the hydration temperature rise peak of cement products, adjust the hydration heat release curve of cement products, inhibit the cracking of cement products, and ensure the strength of cement products. DETAILED DESCRIPTION

[0022] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0023] In view of the problem that starch products in cement hydration heat inhibitors affect cement hydration rate in the prior art, the present application provides a hydration heat inhibitor, which reduces the effect of starch raw materials on the setting time of cement products by modifying the starch raw material regulator with a modifier, and at the same time, the coagulant, water reducer and reinforcing agent are combined to further increase the setting speed of cement products and improve the strength of cement products at various ages. Specifically, the embodiment of the present invention discloses a hydration heat inhibitor, including:

[0024]

[0025] The regulator is a starch raw material;

[0026] The modifier includes one or more of sodium pyrosulfite, sodium sulfite and chlorosulfonic acid.

[0027] In the hydration heat inhibitor, the starch raw material of the regulator may include one or both of starch and maltodextrin, and the starch includes but is not limited to corn starch, sweet potato starch, wheat starch, potato starch, etc. The content of the regulator is 60 to 75 parts by weight, specifically, the content of the regulator is 65 to 72 parts by weight; for example, the content of the regulator in the present application is 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 73 parts by weight or 74 parts by weight.

[0028] The modifier includes one or more of sodium metabisulfite, sodium sulfite and chlorosulfonic acid. Specifically, the modifier is selected from sodium metabisulfite, sodium sulfite or chlorosulfonic acid. The modifier can modify the regulator. Taking starch as an example, its functional groups can be increased so that the regulator can better regulate the hydration of cement products. However, only introducing modifiers and regulators will also have a negative impact on the hydration of cement products. The content of the modifier is 10 to 15 parts by weight. Specifically, the content of the modifier is 12 to 14 parts by weight. For example, the content of the modifier in this application is 11 parts by weight and 13 parts by weight.

[0029] Adding water reducer, enhancer and coagulant to the hydration heat inhibitor can make up for many shortcomings of the modified regulator. The water reducer includes one or more of sucrose, glucose and sodium gluconate. Specifically, the water reducer is selected from one of sucrose, glucose and sodium gluconate, wherein sucrose includes but is not limited to cane sugar and beet sugar. The content of the water reducer is 5 to 10 parts by weight. Specifically, the content of the water reducer is 6 to 9 parts by weight; for example, the content of the water reducer in this application is 7 parts by weight and 8 parts by weight. The water reducer affects the slurry fluidity of cement products.

[0030] The reinforcing agent can improve the strength of cement products at all ages, and includes one or two of hydroxypropyl methylcellulose and rubber powder. The viscosity of the hydroxypropyl methylcellulose is 1000mPa·s to 200000mPa·s. Specifically, the viscosity of the hydroxypropyl methylcellulose is 5000mPa·s to 150000mPa·s. More specifically, the viscosity of the hydroxypropyl methylcellulose is 10000mPa·s to 100000mPa·s. The rubber powder includes copolymer rubber powder of vinyl acetate and ethylene, and copolymer rubber powder of acrylate and styrene. In the present application, the reinforcing agent is a mixture of hydroxypropyl methylcellulose and rubber powder in equal mass proportions, and the rubber powder is copolymer rubber powder of vinyl acetate and ethylene, that is, redispersible latex powder. The content of the reinforcing agent is 1 to 5 parts by weight, specifically, the content of the reinforcing agent is 2 to 4 parts by weight; for example, the content of the reinforcing agent in the present application is 3 parts by weight.

[0031] The coagulant will affect the temperature rise and setting speed of cement products. The amount of coagulant added can be adjusted according to the temperature rise and setting speed requirements of cement products. The coagulant includes one or both of ammonium aluminum sulfate and aluminum sulfate. Specifically, the coagulant is selected from one of ammonium aluminum sulfate and aluminum sulfate. The content of the coagulant is 3 to 10 parts by weight. Specifically, the content of the coagulant is 4 to 9 parts by weight. For example, the content of the coagulant in this application is 5 parts by weight, 6 parts by weight, 7 parts by weight, and 8 parts by weight.

[0032] In the present application, the regulator, the modifier, the coagulant, the water reducer and the enhancer are all commercially available products. Preferably, the regulator, the water reducer, the enhancer, the coagulant and the modifier are 100 parts by weight in total.

[0033] The present application also provides a method for preparing a hydration heat inhibitor, comprising the following steps:

[0034] According to the ratio, the regulator and the modifier are mixed, and the modified regulator is obtained after sulfonation;

[0035] The modified regulator is mixed with a water reducing agent, a reinforcing agent and a coagulant to obtain a hydration heat inhibitor.

[0036] In the preparation process of the hydration heat inhibitor, the present application first uses a modifier to modify the regulator to sulfonate it, so as to increase the functional groups on the surface of the regulator to obtain a modified regulator. In order to ensure the sulfonation effect, the present application preferably adds the modifier to the regulator and stirs while adding, and the temperature of addition is 70 to 200°C, specifically, the temperature of addition is 70 to 180°C, and more specifically, the temperature of addition is 90 to 150°C. The stirring speed is 100 to 500r / min, specifically, the stirring speed is 200 to 400r / min. The modification time is 2 to 5h, specifically, the modification time is 3 to 4h.

[0037] The present application then mixes the modified regulator, water reducing agent, reinforcing agent and coagulant to obtain the hydration heat inhibitor. The mixing method is carried out in a manner well known to those skilled in the art, and the present application does not impose any particular limitation on this.

[0038] The present application also provides a cement product, which includes the hydration heat inhibitor described in the above scheme.

[0039] The cement product may be a cement product well known to those skilled in the art, and may be concrete, which includes cement, water, sand, gravel and a hydration heat inhibitor. The hydration heat inhibitor is the hydration heat inhibitor described in the above scheme, and its content is 3 to 10 wt % of the cement. More specifically, the content of the hydration heat inhibitor is 5 to 8 wt % of the cement.

[0040] The present application provides a hydration heat inhibitor, wherein the starch raw material of the regulator is sulfonated by a modifier, thereby reducing the influence of the starch raw material on the setting time of cement products. At the same time, the water reducer and coagulant in the hydration heat inhibitor can further increase the setting speed of cement products, and the reinforcing agent can increase the strength of cement products at various ages. The hydration heat inhibitor provided by the present application is suitable for the production of large-volume concrete projects or thermal insulation building materials, can significantly reduce the peak temperature rise of cement hydration, adjust the hydration heat release curve of cement products, inhibit the cracking of cement products, and ensure the construction quality.

[0041] In order to further understand the present invention, the hydration heat inhibitor and the preparation method thereof provided by the present invention are described in detail below in conjunction with the examples. The protection scope of the present invention is not limited by the following examples.

[0042] In the following embodiments, the ratio between the components is the ratio of mass parts unless otherwise specified. The mass parts used, as an example, can be 100g per portion, or any other amount commonly used in the art. The ratio between the components is the ratio of mass parts unless otherwise specified.

[0043] Example 1

[0044] The present embodiment provides a cement hydration heat inhibitor, comprising: 65 parts of a regulator, 10 parts of a water reducer, 3 parts of a reinforcing agent, 10 parts of a coagulant, and 12 parts of a modifier; wherein the regulator is corn starch, the modifier is sodium metabisulfite, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl methylcellulose and rubber powder, the viscosity of the hydroxypropyl methylcellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is ammonium aluminum sulfate.

[0045] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0046] Example 2

[0047] The present embodiment provides a cement hydration heat inhibitor, comprising: 70 parts of a regulator, 6 parts of a water reducer, 3 parts of a reinforcing agent, 7 parts of a coagulant, and 14 parts of a modifier, wherein the regulator is corn starch, the modifier is sodium pyrosulfite, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl methylcellulose and rubber powder, the viscosity of the hydroxypropyl methylcellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is ammonium aluminum sulfate.

[0048] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0049] Example 3

[0050] The present embodiment provides a cement hydration heat inhibitor, comprising: 72 parts of a regulator, 7 parts of a water reducer, 3 parts of a reinforcing agent, 4 parts of a coagulant, and 14 parts of a modifier; wherein the regulator is corn starch, the modifier is sodium metabisulfite, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl methylcellulose and rubber powder, the viscosity of the hydroxypropyl methylcellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is ammonium aluminum sulfate.

[0051] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0052] Example 4

[0053] The present embodiment provides a cement hydration heat inhibitor, comprising: 65 parts of a regulator, 10 parts of a water reducer, 3 parts of a reinforcing agent, 10 parts of a coagulant, and 12 parts of a modifier, wherein the regulator is corn starch, the modifier is sodium sulfite, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl methylcellulose and rubber powder, the viscosity of the hydroxypropyl methylcellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is ammonium aluminum sulfate.

[0054] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0055] Example 5

[0056] The present embodiment provides a cement hydration heat inhibitor, comprising: 65 parts of a regulator, 10 parts of a water reducer, 3 parts of a reinforcing agent, 10 parts of a coagulant, and 12 parts of a modifier; wherein the regulator is corn starch, the modifier is sodium metabisulfite, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl cellulose and rubber powder, the viscosity of the reinforcing agent hydroxypropyl cellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is aluminum sulfate.

[0057] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0058] Comparative Example 1

[0059] The present embodiment provides a cement hydration heat inhibitor, comprising: 72 parts of a regulator, 7 parts of a water reducer, 3 parts of a reinforcing agent, and 4 parts of a coagulant; wherein the regulator is corn starch, the water reducer is cane sugar, the reinforcing agent is a mixture of equal amounts of hydroxypropyl methylcellulose and rubber powder, the viscosity of the hydroxypropyl methylcellulose is 200000 mPa.s, the reinforcing agent rubber powder is a redispersible latex powder, and the coagulant is ammonium aluminum sulfate.

[0060] The proportions of the above components are shown in Table 1, where the raw materials are calculated by mass fraction.

[0061] 1) The preparation method of the cement hydration heat inhibitor in the above embodiment is specifically as follows:

[0062] At 90°C, add the modifier to the regulator while stirring to promote sulfonation of the regulator to obtain a modified regulator. The stirring speed is 200 r / min for 4 hours.

[0063] The modified regulator is mixed with the water reducing agent, the reinforcing agent and the setting accelerator to obtain the cement hydration heat inhibitor.

[0064] 2) The preparation method of the cement hydration heat inhibitor in the above comparative example is specifically as follows:

[0065] The regulator, water reducing agent, reinforcing agent and accelerator are mixed according to mass fractions to obtain the cement hydration heat inhibitor.

[0066] 3) Effect verification

[0067] The C15 concrete mix was used to test the effects of the hydration heat inhibitors of the embodiments and comparative examples. The concrete mix is ​​shown in Table 2, which is a data table of C15 concrete mix materials, wherein cement, sand, and gravel are all commercially available building supplies, and the mixing water is municipal tap water. The amount of cement hydration heat inhibitor used in each example is 3% of the mass of cement.

[0068] During the test, sufficient mixing water was first added to the mixer, and then the hydration heat inhibitor, cement, sand and gravel were added in sequence. After mixing, the mixture was poured into a polystyrene insulation box. A multi-channel temperature inspection instrument was used to detect the temperature change of the concrete sample. The temperature, strength and other data of the sample are shown in Table 3. Table 3 is a data table of the use effect of the cement hydration heat inhibitor in each example.

[0069] Table 1 Preparation formula data of cement hydration heat inhibitor in each embodiment

[0070] Group Conditioner Modifier Water reducing agent Enhancer Coagulant Example 1 65 12 10 3 10 Example 2 70 14 6 3 7 Example 3 72 14 7 3 4 Example 4 65 12 10 3 10 Example 5 65 12 10 3 10 Comparative Example 1 72 / 7 3 4

[0071] Table 2C15 concrete batching scheme data table

[0072] Cement / g Water / g Sand / g Stone / kg Hydration heat inhibitor / g 350 570 1400 2700 10.5

[0073] Table 3 Data table of the effects of the hydration heat inhibitors used in various embodiments and comparative examples

[0074]

[0075]

[0076] It can be seen from Table 3 that, compared with the C15 concrete without adding the hydration heat inhibitor, the hydration heat inhibitor provided by Examples 1 to 5 achieves better control over the temperature rise, and both the setting speed and the strength are improved; compared with the C15 concrete without the hydration heat inhibitor modified by the regulator, the maximum temperature rise, the maximum temperature rise time and the strength of the hydration heat inhibitor provided by Example 3 are improved, eliminating the negative effect of the regulator itself on the concrete strength.

[0077] The effects of the hydration heat inhibitors of the embodiments and comparative examples on the setting time of cement paste were tested by testing the initial and final setting experiments. The cement paste proportions are shown in Table 4, which is a data table of cement paste proportioning schemes, wherein cement is commercially available building supplies, mixing water is municipal tap water, and the amount of cement hydration heat inhibitor used in each example is 1% of the cement mass.

[0078] During the test, sufficient mixing water was first added to the mixer, and then the hydration heat inhibitor and cement were added in sequence. After mixing, the mixture was poured into an iron round mold. The initial setting and final setting data of the sample are shown in Table 5. Table 5 is a data table showing the effect of the cement hydration heat inhibitor on the cement setting time in each example.

[0079] Table 4 Cement paste batching scheme data table

[0080] Cement / g Water / g Hydration heat inhibitor / g 300 105 3

[0081] Table 5 Data table of the effects of the hydration heat inhibitors used in various embodiments and comparative examples

[0082]

[0083] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0084] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydration heat inhibitor, comprising: The regulator is a starch raw material; The modifier includes one or more of sodium pyrosulfite, sodium sulfite and chlorosulfonic acid.

2. The hydration heat inhibitor according to claim 1, characterized in that: The starch raw material includes one or both of starch and maltodextrin.

3. The hydration heat inhibitor according to claim 1, characterized in that: The reinforcing agent includes one or two of hydroxypropyl methylcellulose and rubber powder; the viscosity of the hydroxypropyl methylcellulose is 1000mPa·s-200000mPa·s, and the rubber powder includes copolymer rubber powder of vinyl acetate and ethylene, and copolymer rubber powder of acrylate and styrene.

4. The hydration heat inhibitor according to claim 1, characterized in that: The coagulant comprises one or both of ammonium aluminum sulfate and aluminum sulfate.

5. The hydration heat inhibitor according to claim 1, characterized in that: The water reducing agent includes one or more of sucrose, glucose and sodium gluconate.

6. The hydration heat inhibitor according to claim 1, characterized in that: The amount of the regulator added is 65 to 72 parts by weight.

7. The hydration heat inhibitor according to claim 1, characterized in that: The amount of the modifier added is 12 to 14 parts by weight.

8. The method for preparing the hydration heat inhibitor according to any one of claims 1 to 7, comprising the following steps: According to the ratio, the regulator and the modifier are mixed, and the modified regulator is obtained after sulfonation; The modified regulator is mixed with a water reducing agent, a reinforcing agent and a coagulant to obtain a hydration heat inhibitor.

9. The preparation method according to claim 8, characterized in that: The sulfonation temperature is 50-200° C. and the time is 2-5 hours.

10. A cement product, comprising the hydration heat inhibitor according to any one of claims 1 to 7 or the hydration heat inhibitor prepared by the preparation method according to any one of claims 8 to 9.

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