High-adaptability six-carbon polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses a high-adaptability six-carbon polycarboxylate superplasticizer, which has the following structural general formula: in the # imgabs0 # formula, a is equal to 2-5, b is equal to 2-5, c is equal to 5-20, d is equal to 2-5, m is equal to 12-20, n is equal to 25-35, x is equal to 3-6, y is equal to 3-6, and z is equal to 3-6. The polycarboxylate superplasticizer disclosed by the invention has the advantages of high water reducing property, high applicability, excellent workability and the like; the preparation method has the advantages of wide raw material source, mild reaction conditions and low preparation cost, and is suitable for popularization and application.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete admixtures, and particularly relates to silicon ash mortar for concrete and a preparation method thereof. Background Art

[0002] As a new generation of concrete admixture, polycarboxylate water-reducing agent has been widely used due to its advantages such as low dosage, flexible and adjustable molecular structure, safety and environmental protection. With the development of the construction industry, high-quality natural sand and gravel are consumed in large quantities, resulting in the use of sand and gravel aggregates with high mud content in construction projects. Polycarboxylate water-reducing agent is sensitive to the mud in sand and gravel, and the adsorption capacity of clay components on polycarboxylate water-reducing agent is much greater than that on cement, which leads to a sharp decrease in the effective components of water-reducing agent adsorbed on the cement surface, which in turn seriously affects the performance of polycarboxylate water-reducing agent.

[0003] In response to the above problems, two main research and improvement methods are currently used: one is to compound sacrificial agents with polycarboxylate water reducers, and reduce the adsorption of clay to polycarboxylate water reducers by preferentially adsorbing the sacrificial agents on clay; the other is to directly develop anti-mud polycarboxylate water reducers with low sensitivity to clay through molecular structure design to inhibit the negative effects of clay. Although compound sacrificial agents are convenient and effective, the addition of compound sacrificial agents is likely to have a certain impact on the strength of concrete, and the compatibility of sacrificial agents and water reducers must also be considered. In addition, positively charged sacrificial agents may preferentially adsorb on the cement surface to form competitive adsorption with polycarboxylate water reducers, reducing the dispersibility of water reducers. The existing synthesis of anti-mud polycarboxylate water reducers mainly has the following ideas: (1) Synthesize PEO-free or short PEO side chain water reducers based on the characteristics of PEO side chains that easily enter the interlayer of montmorillonite; (2) Introduce groups and monomers with large steric hindrance; (3) Introduce functional groups and monomers that are insensitive to montmorillonite; However, existing polycarboxylate water reducers usually have problems such as limited adaptability. Summary of the invention

[0004] The main purpose of the present invention is to provide a highly adaptable hexacarbon polycarboxylate water-reducing agent in view of the problems and shortcomings of the existing polycarboxylate water-reducing agent, such as limited adaptability. The polycarboxylate water-reducing agent has the advantages of high water reduction, high applicability and excellent workability; and the raw materials involved in the preparation are widely available and the reaction conditions are relatively mild, so the polycarboxylate water-reducing agent is suitable for popularization and application.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A highly adaptable hexacarbon polycarboxylic acid water reducer, the general structural formula of which is shown in Formula I;

[0007]

[0008] In the formula, a=2-5, b=2-5, c=5-20, d=2-5, m=12-20, n=25-35, x=3-6, y=3-6, z=3-6.

[0009] In the above scheme, the molecular weight of the highly adaptable hexacarbon polycarboxylic acid water reducer is 10000-13000.

[0010] The preparation method of the above-mentioned highly adaptable hexacarbon polycarboxylic acid water reducer comprises the following steps:

[0011] S1: dissolving a polyether macromonomer in water to obtain a solution A; dissolving an unsaturated carboxylic acid, polyethylene glycol sorbitol acrylate and a chain transfer agent in water to obtain a solution B; dissolving an unsaturated polyoxyethylene polyether in water to obtain a solution C; dissolving a reduced initiator in water to obtain a solution D;

[0012] S2: adding an oxidative initiator to solution A to form solution E; then dropping solutions B and D into solution E simultaneously under stirring, wherein solution C is added after solution B is added;

[0013] S3: stirring the reaction, adding alkali solution to terminate the reaction, adjusting the pH value and solid content, and obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0014] In the above scheme, in S2, the dropwise addition time of solution B is controlled at 10-15 min, the dropwise addition time of solution C is controlled at 10-15 min, and the dropwise addition time of solution D is controlled at 30-40 min.

[0015] In the above scheme, in the preparation process of the highly adaptable hexacarbon polycarboxylic acid water-reducing agent, the main raw materials and their weight proportions include: 100 parts of polyether macromonomer, 21-24 parts of unsaturated carboxylic acid, 22-25 parts of polyethylene glycol sorbitol acrylate, and 10-20 parts of unsaturated polyoxyethylene ether monomer.

[0016] In the above scheme, in solution A, the mass fraction of the polyether macromonomer is 45-55%; in solution B, the mass fraction of the unsaturated carboxylic acid is 63-66%, and the mass fraction of the chain transfer agent is 5.5-5.8%; in solution C, the mass fraction of the unsaturated polyoxyethylene ether monomer is 30-50%; in solution D, the mass fraction of the reduced initiator is 1.5-2.0%.

[0017] Furthermore, the molecular weight of the polyether macromonomer is 1200-1500; the molecular weight of polyethylene glycol sorbitol acrylate is 600-1000; and the molecular weight of the unsaturated polyoxyethylene ether monomer is 600-800.

[0018] Furthermore, the preparation process of the highly adaptable hexacarbon polycarboxylic acid water-reducing agent also includes: 3.0-3.5 parts of chain transfer agent, 1.7-2.7 parts of oxidative initiator, and 0.2-0.3 parts of reducing initiator.

[0019] In the above scheme, the preparation method of polyethylene glycol sorbitol acrylate comprises the following steps: adding polyethylene glycol sorbitol, cyclohexane and hydroquinone into a reaction container, heating (first heating), stirring evenly, adding a solid acid catalyst and acrylic acid, continuing to heat (second heating) for stirring, condensing and reflux reaction, filtering, and the obtained filtrate is polyethylene glycol sorbitol acrylate.

[0020] In the above scheme, in the preparation process of polyethylene glycol sorbitol acrylate, the main raw materials and their weight proportions include: 21-24 parts of polyethylene glycol sorbitol, 5-10 parts of cyclohexane, 0.1-0.5 parts of hydroquinone, 1-5 parts of solid acid catalyst, and 30-60 parts of acrylic acid.

[0021] Furthermore, the molecular weight of the polyethylene glycol sorbitol is 600-1000.

[0022] Furthermore, the solid acid catalyst can be a green synthetic chemical solid acid catalyst (instead of liquid acid sulfuric acid as a catalyst).

[0023] In the above proposal, the temperature used for the first heating is 50-60°C; the temperature used for the second heating is 110-130°C.

[0024] Furthermore, during the stirring, condensing and reflux reaction, cyclohexane and water produced during the reaction process evaporate into the condenser, are cooled by the condenser, and flow into the water separator. A separation phenomenon occurs in the water separator, wherein the upper layer is mainly water and the lower layer is mainly cyclohexane. The water in the water separator is poured out and its mass is measured. When its mass is close to the water produced in the calculation or when the reaction no longer produces water, it is determined that the reaction has been completed, the solid acid in the four-necked flask is filtered out, and the filtrate is taken. The filtrate is the final product, polyethylene glycol sorbitol acrylate. During the above reaction process, cyclohexane is used to remove the water produced in the reaction from the four-necked flask and remove the water in the four-necked flask, which can make the esterification reaction more thorough and improve the conversion rate of the esterification reaction.

[0025] In the above scheme, the polyether monomer is ethylene glycol monovinyl polyoxyethylene ether, and its molecular weight is 1200-1500.

[0026] In the above embodiment, the unsaturated carboxylic acid can be selected from one or more of acrylic acid, methacrylic acid, tartaric acid, itaconic acid and the like.

[0027] In the above scheme, the unsaturated polyoxyethylene ether monomer can be selected from one or more of methyl allyl polyoxyethylene ether and isopentenyl polyoxyethylene ether, and the molecular weight thereof is 600-800.

[0028] In the above scheme, the chain transfer agent can be selected from one or more of sodium hypophosphite, mercaptopropionic acid, thioglycolic acid and the like.

[0029] In the above scheme, the reducing initiator is sodium formaldehyde sulfoxylate or ascorbic acid; the oxidizing initiator can be hydrogen peroxide, etc., with a concentration of 25-35wt%.

[0030] In the above scheme, the alkali solution can be sodium hydroxide solution or the like, and its concentration is 28-32wt%.

[0031] Furthermore, during the dropwise addition of solutions B, C, and D in S3, solution B is added dropwise first and then solution C, and a power catalyst is added before solution C is added dropwise.

[0032] In the above scheme, the power catalyst is a ferrous sulfate solution; and the mass ratio of the power catalyst to the polyether macromonomer is 0.3-0.7:100.

[0033] Furthermore, the concentration of the ferrous sulfate solution is 0.5-1.5wt%.

[0034] In the above scheme, the stirring reaction time in S4 is 30-40 minutes.

[0035] In the above scheme, the pH value in S4 is adjusted to 6-7.

[0036] In the above scheme, the solid content in S4 is adjusted to 38%-42%

[0037] In the above scheme, the temperature in S1-S4 is controlled at 5-30°C.

[0038] The highly adaptable hexacarbon polycarboxylic acid water-reducing agent prepared according to the above scheme has a water-reducing rate of up to 50%, and is highly adaptable to concrete encapsulation problems caused by high methylene blue values, large mud content, and poor aggregate grading in different regions.

[0039] Compared with the prior art, the beneficial technical effects of the present invention are:

[0040] 1. The hexacarbon polycarboxylic acid water reducer of the present invention has a lower molecular weight than the traditional polycarboxylic acid water reducer, has excellent water reducing performance, and the water reducing rate can reach 50%;

[0041] 2. The present invention adopts two polyether macromonomer side chains of different lengths and structures, and combines them with polyethylene glycol sorbitol acrylate side chains that can improve the state of concrete. The polyethylene glycol sorbitol produced during the hydrolysis of polyethylene glycol sorbitol acrylate can act as a lubricant and clay sacrificial agent for concrete, so that the obtained polycarboxylate water reducer has high applicability and can be applied to mud, sand and stone materials of poor quality in different regions, and still show excellent working performance;

[0042] 3. The polycarboxylate water-reducing agent provided by the present invention has excellent workability when applied to concrete, and the concrete slurry has better cohesion and fluidity;

[0043] 4. The raw materials of the hexacarbon polycarboxylic acid water-reducing agent of the present invention are bulk products, the reaction conditions and temperature are (5°C-30°C), energy saving and consumption reduction, and green and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is the GPC spectrum of the polycarboxylate water-reducing agent obtained in Example 1;

[0045] Figure 2 This is the GPC spectrum of the polycarboxylate water-reducing agent obtained in Comparative Example 1;

[0046] Figure 3 This is the GPC spectrum of the commercially available hexacarbon mother liquor sample. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The raw materials not specifically described in the following examples are all common commercially available raw materials.

[0049] In the following examples, the preparation method of polyethylene glycol sorbitol acrylate comprises the following steps:

[0050] Place a four-necked flask in an oil bath, add silicone oil into the oil bath, connect a vertical condensation reflux tube to the upper end of the four-necked flask, connect the water inlet at the lower end of the reflux condenser to a tap water pipe, connect the water outlet at the upper end to a water outlet pipe, and connect the discharge port of the reflux condenser to a water separator;

[0051] Take 23 parts of polyethylene glycol sorbitol (parts by weight, the same below), 7 parts of cyclohexane, and 0.5 parts of hydroquinone in a four-necked flask, heat to 60°C, start stirring, add 4 parts of solid acid catalyst (Secosase solid acid catalyst) after stirring evenly, add 40 parts of acrylic acid, heat to 120°C, stir, condense and reflux for 4h-6h. During the reaction, cyclohexane and water produced in the reaction process evaporate into the condenser, cool through the condenser, and flow into the water separator. The water separator will produce a separation phenomenon, the upper layer is mainly water, and the lower layer is mainly cyclohexane. Pour out the water in the water separator and measure its mass. When its mass is close to the water produced in the calculation or when the reaction no longer produces water, it is determined that the reaction has been completed, filter out the solid acid in the four-necked flask, and take the filtrate. The filtrate is the final product, polyethylene glycol sorbitol acrylate; wherein the polyethylene glycol sorbitol used is provided by McLean Pharmaceuticals; the molecular weight of the obtained polyethylene glycol sorbitol acrylate is 856.

[0052] Example 1

[0053] A highly adaptable hexacarbon polycarboxylic acid water reducer, the preparation method of which comprises the following steps:

[0054] S1: 100 parts of vinyl polyoxyethylene ether with a molecular weight of 1500 are dissolved in water to obtain solution A, in which the mass fraction of the polyether macromonomer is 55%; 24 parts of acrylic acid, 22 parts of polyethylene glycol sorbitol acrylate and 3 parts of mercaptopropionic acid are dissolved in water to obtain solution B, in which the mass fraction of acrylic acid is 64%, and the mass fraction of mercaptopropionic acid is 5.6%; 20 parts of isopentyl polyoxyethylene polyether monomer with a molecular weight of 800 are dissolved in water to obtain solution C, in which the mass fraction of the unsaturated polyoxyethylene ether monomer is 45%; 0.3 parts of sodium formaldehyde sulfoxylate are dissolved in water to obtain solution D, in which the mass fraction of sodium formaldehyde sulfoxylate is 1.7%;

[0055] S2: Add 2.7 parts of 30% hydrogen peroxide to solution A to form solution E; then add solutions B, C, and D to solution E at a uniform rate while stirring, wherein solution B is added for 10 minutes, solution C is added for 10 minutes, solution B is added first and then solution C, when solution B is added completely, 0.3 parts of 1% ferrous sulfate is added before solution C is added, and solution D is added for 30 minutes;

[0056] S3: After the solution D is dripped, the reaction is stirred for 30 minutes, and an alkali solution is added to terminate the reaction. The pH value is adjusted to 6-7, and water is added to the product until the solid content is 40%, thereby obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0057] The above reaction temperature is controlled at 7°C ± 2°C;

[0058] Example 2

[0059] A highly adaptable hexacarbon polycarboxylic acid water reducer, the preparation method of which comprises the following steps:

[0060] S1: Dissolve 100 parts of ethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 1500 in water to obtain solution A, wherein the mass fraction of the polyether macromonomer is 55%; dissolve 24 parts of tartaric acid, 23 parts of polyethylene glycol sorbitol acrylate and 3.0 parts of mercaptopropionic acid in water to obtain solution B, wherein the mass fraction of tartaric acid is 66%, and the mass fraction of mercaptopropionic acid is 5.8%; dissolve 20 parts of isopentenyl polyoxyethylene ether monomer with a molecular weight of 800 in water to obtain solution C, wherein the mass fraction of isopentenyl polyoxyethylene ether monomer is 50%; dissolve 0.3 parts of sodium formaldehyde sulfoxylate in water to obtain solution D, wherein the mass fraction of sodium formaldehyde sulfoxylate in D is 2.0%;

[0061] S2: 1.7 parts of 30 wt% hydrogen peroxide are added to solution A to form solution E; then solutions B, C, and D are uniformly added to solution E while stirring, wherein solution B is added for 15 min, solution C is added for 15 min, solution B is added first and then solution C, when solution B is added, 0.7 parts of 1% ferrous sulfate is added before solution C is added, and solution D is added for 40 min;

[0062] S3: After the solution D is dripped, the reaction is stirred for 40 minutes, 30% sodium hydroxide is added to terminate the reaction, the pH value is adjusted to 6-7, and water is added to the product solid content of 40%, thereby obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0063] The above reaction temperature is controlled at 28°C ± 2°C;

[0064] Example 3

[0065] A highly adaptable hexacarbon polycarboxylic acid water reducer, the preparation method of which comprises the following steps:

[0066] S1: Dissolve 100 parts of ethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 1300 in water to obtain solution A, wherein the mass fraction of the polyether macromonomer is 50%; dissolve 22 parts of methacrylic acid, 22 parts of polyethylene glycol sorbitol acrylate and 3.1 parts of thioglycolic acid in water to obtain solution B, wherein the mass fraction of methacrylic acid is 65%, and the mass fraction of thioglycolic acid is 5.5%; dissolve 15 parts of methyl allyl polyoxyethylene ether with a molecular weight of 800 in water to obtain solution C, wherein the mass fraction of methyl allyl polyoxyethylene ether is 45%; dissolve 0.25 parts of formaldehyde and sodium bisulfate in water to obtain solution D, wherein the mass fraction of formaldehyde and sodium bisulfate is 1.7%;

[0067] S2: Add 2.0 parts of 30 wt% hydrogen peroxide to solution A to form solution E; then add solutions B, C, and D to solution E at a uniform rate while stirring, wherein solution B is added for 15 minutes, solution C is added for 10 minutes, solution B is added first and then solution C, when solution B is added completely, 0.5 parts of 1% ferrous sulfate is added before solution C is added, and solution D is added for 30 minutes;

[0068] S3: After the solution D is dripped, the reaction is stirred for 40 minutes, 30% sodium hydroxide is added to terminate the reaction, the pH value is adjusted to 6-7, and water is added to the product solid content of 40%, thereby obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0069] The above reaction temperature is controlled at 10°C ± 2°C;

[0070] Example 4

[0071] A highly adaptable hexacarbon polycarboxylic acid water reducer, the preparation method of which comprises the following steps:

[0072] S1: Dissolve 100 parts of ethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 1400 in water to obtain solution A, wherein the mass fraction of the polyether macromonomer is 47%; dissolve 23 parts of acrylic acid, 22 parts of polyethylene glycol sorbitol acrylate and 3.3 parts of sodium hypophosphite in water to obtain solution B, wherein the mass fraction of acrylic acid is 63%, and the mass fraction of sodium hypophosphite is 5.7%; dissolve 18 parts of isopentenyl polyoxyethylene ether monomer with a molecular weight of 600 in water to obtain solution C, wherein the mass fraction of isopentenyl polyoxyethylene ether monomer is 30%; dissolve 0.27 parts of ascorbic acid in water to obtain solution D, wherein the mass fraction of ascorbic acid is 1.8%;

[0073] S2: Add 2.5 parts of 30 wt% hydrogen peroxide to solution A to form solution E; then add solutions B, C, and D to solution E at a uniform rate while stirring, wherein solution B is added for 13 minutes and solution C is added for 12 minutes, solution B is added first and then solution C, when solution B is added completely, 0.6 parts of 1% ferrous sulfate is added before solution C is added, and solution D is added for 35 minutes;

[0074] S3: After the solution D is dripped, the reaction is stirred for 35 minutes, 30% sodium hydroxide is added to terminate the reaction, the pH value is adjusted to 6-7, and water is added to the product solid content of 40%, thereby obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0075] The above reaction temperature is controlled at 15°C ± 2°C;

[0076] Example 5

[0077] A highly adaptable hexacarbon polycarboxylic acid water reducer, the preparation method of which comprises the following steps:

[0078] S1: Dissolve 100 parts of ethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 1300 in water to obtain solution A, wherein the mass fraction of ethylene glycol monovinyl polyoxyethylene ether is 53%; dissolve 23 parts of itaconic acid, 22 parts of polyethylene glycol sorbitol acrylate and 3.3 parts of mercaptopropionic acid in water to obtain solution B, wherein the mass fraction of itaconic acid is 65%, and the mass fraction of mercaptopropionic acid is 5.7%; dissolve 17 parts of methyl allyl polyoxyethylene ether with a molecular weight of 700 in water to obtain solution C, wherein the mass fraction of methyl allyl polyoxyethylene ether monomer is 35%; dissolve formaldehyde and sodium bisulfate in water to obtain solution D, wherein the mass fraction of formaldehyde and sodium bisulfate is 1.6%;

[0079] S2: Add 2.3 parts of 30 wt% hydrogen peroxide to solution A to form solution E; then add solutions B, C, and D to solution E at a uniform rate while stirring, wherein solution B is added for 13 min and solution C is added for 14 min, solution B is added first and then solution C, when solution B is added completely, 0.4 parts of 1% ferrous sulfate is added before solution C is added, and solution D is added for 40 min;

[0080] S3: After the solution D is dripped, the reaction is stirred for 40 minutes, 30% sodium hydroxide is added to terminate the reaction, the pH value is adjusted to 6-7, and water is added to the product solid content of 40%, thereby obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

[0081] The above reaction temperature is controlled at 20°C ± 2°C;

[0082] Comparative Example 1

[0083] A polycarboxylate water reducer, the preparation method of which is substantially the same as that of Example 2, except that: polyethylene glycol sorbitol acrylate is not introduced into solution B, and the monomer in solution C is replaced by ethylene glycol monovinyl polyoxyethylene.

[0084] Comparative Example 2

[0085] A polycarboxylate water-reducing agent, the preparation method of which is substantially the same as that of Example 2, except that: polyethylene glycol sorbitol acrylate is not introduced into solution B, and the monomer in solution A is replaced by isopentenyl polyoxyethylene ether.

[0086] Comparative Example 3

[0087] A polycarboxylate water-reducing agent, the preparation method of which is substantially the same as that of Example 2, except that: polyethylene glycol sorbitol acrylate is not introduced into solution B, and the monomers in solution A and solution C are replaced by methyl allyl polyoxyethylene ether.

[0088] Comparative Example 4

[0089] A polycarboxylic acid water reducer, the preparation method of which is substantially the same as that of Example 2, except that the preparation method of polyethylene glycol sorbitol acrylate comprises the following steps: taking 23 parts (parts by weight, the same below) of polyethylene glycol sorbitol and 0.5 parts of hydroquinone in a four-necked flask, heating to 60° C., starting stirring, stirring evenly, adding 4 parts of 98% concentrated sulfuric acid, adding 40 parts of acrylic acid, heating to 120° C., and stirring for reaction for 5 hours.

[0090] Performance Testing

[0091] With reference to GB 8076-2008 Concrete Admixtures and GB / T 50080-2002 Standard Test Methods for Properties of Ordinary Concrete Mixtures, the dispersion, slump and mechanical properties of concrete were tested. The concrete mix ratio is shown in Table 1, and the concrete expansion, slump, paste viscosity (drum inversion time) and test results are shown in Table 2. The sand and coarse aggregate were taken from Yunnan (high mud content in sand and gravel), Liaoning (some weathered sand, absorbing a large amount of admixtures), Guangxi (high mud content in materials), Hubei (small river sand fineness modulus and high methylene blue value), and Zhejiang (moderate materials).

[0092] Table 1 Concrete test results

[0093]

[0094]

[0095] Attached Figure 2 , Figure 2 , Figure 3 The relative molecular weight of the polycarboxylate water-reducing agent provided by the present invention is compared with that of commercially available products. It can be seen from the figure that the molecular weight of the polycarboxylate water-reducing agent obtained in Example 1 of the present invention is 11559, which is smaller than that of the commercially available product in Comparative Example 1.

[0096] Through the above experiments, it is proved that the molecular weight of the polycarboxylate water-reducing agent provided by the present invention is higher than that of the common polycarboxylate water-reducing agent, and it has a high water reduction rate and excellent workability when used in concrete. It has better mud resistance and high applicability for sand and gravel materials in different regions. The main reason is that on the one hand, the molecular weight of the present invention is small. When the same mass is added, the number of molecules is large. When adsorbed on the surface of cement particles to saturation, there will be more unabsorbed PCE. The unabsorbed PCE and other fine particles adsorbed with PCE (such as early hydration product AFt) have better workability for the stability of the cement suspension dispersion system through the extrusion emptying effect. Secondly, the polyethylene glycol sorbitol produced during the hydrolysis process of the added polyethylene glycol sorbitol acrylate will play the role of sacrificial agent and lubricant. In addition, the unsaturated double bond in the structure is directly connected to an oxygen atom. Since the double bond in the molecule is a substitution structure, the spatial resistance to the swing of the polyether side chain is further reduced, making the swing of the six-carbon polyether side chain more free and with a larger range of activity, so that it is entangled with the polyether side chains carried by the polymer and monomer in the structure to form a network structure, reducing the consumption of the polyether side chain in the clay, thus having excellent anti-mud performance, and the short side chain also reduces the intercalation effect of the polyether side chain in viscosity.

[0097] The above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here, so the obvious changes or modifications derived are still within the protection scope of the invention.

Claims

1. A highly adaptable hexacarbon polycarboxylic acid water reducer, characterized in that: Its general structural formula is shown in Formula I; In the formula, a=2-5, b=2-5, c=5-20, d=2-5, m=12-20, n=25-35, x=3-6, y=3-6, z=3-6.

2. The highly adaptable hexacarbon polycarboxylic acid water reducer according to claim 1, characterized in that: Its molecular weight is 10000-13000.

3. The method for preparing the highly adaptable hexacarbon polycarboxylic acid water-reducing agent according to claim 1 or 2, characterized in that: The steps include: S1: dissolving a polyether macromonomer in water to obtain a solution A; dissolving an unsaturated carboxylic acid, polyethylene glycol sorbitol acrylate and a chain transfer agent in water to obtain a solution B; dissolving an unsaturated polyoxyethylene ether monomer in water to obtain a solution C; dissolving a reduced initiator in water to obtain a solution D; S2: adding an oxidative initiator to solution A to form solution E; then dropping solutions B and D into solution E simultaneously under stirring, wherein solution C is added after solution B is added; S3: stirring the reaction, adding alkali solution to terminate the reaction, adjusting the pH value and solid content, and obtaining the highly adaptable hexacarbon polycarboxylic acid water reducer.

4. The preparation method according to claim 3, characterized in that: In the preparation process of the highly adaptable hexacarbon polycarboxylic acid water-reducing agent, the main raw materials and their weight proportions include: 100 parts of polyether macromonomer, 21-24 parts of unsaturated carboxylic acid, 22-25 parts of polyethylene glycol sorbitol acrylate, and 10-20 parts of unsaturated polyoxyethylene ether monomer.

5. The preparation method according to claim 3, characterized in that: The molecular weight of the polyether macromonomer is 1200-1500; the molecular weight of polyethylene glycol sorbitol acrylate is 600-1000; and the molecular weight of the unsaturated polyoxyethylene ether monomer is 600-800.

6. The preparation method according to claim 3, characterized in that: The preparation method of polyethylene glycol sorbitol acrylate comprises the following steps: adding polyethylene glycol sorbitol, cyclohexane and hydroquinone into a reaction container, heating, stirring evenly, adding a solid acid catalyst and acrylic acid, continuing heating, stirring, condensing and refluxing reaction, filtering, and obtaining a filtrate that is polyethylene glycol sorbitol acrylate.

7. The preparation method according to claim 6, characterized in that: In the preparation process of the polyethylene glycol sorbitol acrylate, the main raw materials and their weight proportions include: 21-24 parts of polyethylene glycol sorbitol, 5-10 parts of cyclohexane, 0.1-0.5 parts of hydroquinone, 1-5 parts of solid acid catalyst, and 30-60 parts of acrylic acid.

8. The preparation method according to claim 3, characterized in that: The polyether macromonomer is ethylene glycol monovinyl polyoxyethylene ether, and its molecular weight is 1200-1500.

9. The preparation method according to claim 3, characterized in that: The unsaturated carboxylic acid may be one or more selected from acrylic acid, methacrylic acid, tartaric acid, itaconic acid and the like.

10. The preparation method according to claim 3, characterized in that: The unsaturated polyoxyethylene ether monomer is one or more of methyl allyl polyoxyethylene ether and isopentenyl polyoxyethylene ether, and the molecular weight thereof is 600-800.

Images