阅读说明：本技术 一种阻泥剂及其制备方法 (Mud inhibitor and preparation method thereof ) 是由 田耕隋 于 2020-07-17 设计创作，主要内容包括：本发明涉及混凝土外加剂技术领域,具体涉及一种阻泥剂及其制备方法。一种阻泥剂,所述阻泥剂的制备原料,按重量份计,包括以下组分：抗泥剂水溶液40-70份、缓凝剂15-30份、多羟基化合物30-45份、引气剂2-10份。本发明提供了一种阻泥剂,具有较好的抗泥、耐泥作用,既可以单独添加使用,也可以与减水剂、保水剂等混凝土外加剂混合使用,并与其他混凝土外加剂产生协同增效的作用,提高混凝土的流动性、和易性和抗坍塌度。本发明采用自制的抗泥剂,分子结构新颖,主链带有酯类单体和阳离子单体,对普通砂石料,特别对高含泥砂石料具有较好的效果。(The invention relates to the technical field of concrete admixtures, in particular to a mud inhibitor and a preparation method thereof. The mud inhibitor comprises the following raw materials in parts by weight: 40-70 parts of anti-mud agent aqueous solution, 15-30 parts of retarder, 30-45 parts of polyhydroxy compound and 2-10 parts of air entraining agent. The invention provides a mud inhibitor which has better mud resistance and mud resistance, can be independently added for use, can also be mixed with concrete admixtures such as a water reducing agent, a water-retaining agent and the like for use, generates a synergistic interaction effect with other concrete admixtures, and improves the fluidity, the workability and the collapse resistance of concrete. The self-made mud-resisting agent is adopted, the molecular structure is novel, the main chain is provided with the ester monomer and the cation monomer, and the self-made mud-resisting agent has a good effect on common sandstone materials, particularly on high mud-containing sandstone materials.)

1. The mud inhibitor is characterized by comprising the following raw materials in parts by weight: 40-70 parts of anti-mud agent aqueous solution, 15-30 parts of retarder, 30-45 parts of polyhydroxy compound and 2-10 parts of air entraining agent.

2. The mud inhibitor as claimed in claim 1, wherein the raw materials for preparing the aqueous solution of the mud inhibitor comprise the following components in percentage by weight: 30-45% of cationic monomer, 5-15% of acrylate, 1-6% of unsaturated sulfonate compound, 0.1-2% of chain transfer agent, 5-10% of unsaturated ester compound, 5-10% of initiator and the balance of water to 100%.

3. The mud retarder of claim 2, wherein the cationic monomer is selected from at least one of acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and dimethyldiallylammonium chloride.

4. The mud inhibitor of claim 2, wherein the acrylate is selected from at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate.

5. The mud inhibitor according to claim 2, wherein the unsaturated sulfonate compound is at least one selected from sodium methallyl sulfonate and sodium propenyl sulfonate.

6. The mud inhibitor according to claim 2, wherein the unsaturated ester compound is at least one selected from the group consisting of vinyl acetate, allyl acetate, vinyl propionate, vinyl butyrate, and allyl propionate.

7. The mud inhibitor of claim 2, wherein the initiator is at least one of ammonium persulfate, sodium persulfate, potassium persulfate, hydrogen peroxide, sodium formaldehyde sulfoxylate, and ascorbic acid.

8. The mud inhibitor as set forth in claim 2, wherein the preparation method of the anti-mud agent aqueous solution comprises the steps of:

(1) mixing a cationic monomer, acrylic ester, an unsaturated sulfonate compound, a chain transfer agent, an unsaturated ester compound and water, heating to 50-60 ℃ while stirring, and continuously stirring;

(2) dripping an initiator into the step (1), wherein the dripping time is not less than 150 min; after the dropwise addition is finished, heating to 60-70 ℃, and continuously stirring for 60-120 min; then adjusting the solid content to 35-50 wt%, and cooling to below 40 ℃ to obtain the product.

9. The mud resistor of claim 1, wherein the polyol is selected from at least one of cellulose, starch, and dextrin.

10. A method of preparing a mud inhibitor according to any of claims 1 to 9, comprising the steps of: and mixing and stirring the anti-mud agent aqueous solution, the retarder, the polyhydroxy compound and the air entraining agent uniformly to obtain the anti-mud agent.

Technical Field

The invention relates to the technical field of concrete admixtures, in particular to a mud inhibitor and a preparation method thereof.

Background

The cement paste, mortar and concrete material are modern building materials with the largest consumption, and are widely used in various projects such as city construction, infrastructure construction, industrial civil construction, hydraulic engineering, military engineering, transportation engineering and the like in national economic construction. One of the characteristics of concrete materials is compressive strength, workability of durable and fresh concrete, etc. as main design indexes. According to the concrete strength regulation, the determining factor for determining the compressive strength of the cement-based building material is the water-cement ratio, and the smaller the water-cement ratio required by the high-strength cement-based material is, namely the lower the water consumption per unit volume is, the higher the material strength is. In order to maintain the constructability and the working performance of the freshly mixed cement-based material, certain water is required to meet the requirements of the strength and the constructability of the material.

In order to further reduce the water-cement ratio, people invent lignosulfonate water reducing agents, naphthalene sulfonate formaldehyde condensation compounds, melamine sulfonated formaldehyde condensation polymers, acetone sulfonated formaldehyde condensation compounds and polycarboxylic acid high-efficiency water reducing agents, the water-cement ratio (w/c) of cement-based composite materials can be obviously reduced by adding the materials into concrete, and the high-molecular dispersing agents with surface activity solve the basic requirements on strength and workability and meet the requirements of modern construction of modern cement-based materials represented by concrete. As the amount of natural sand decreases, machine-made sand and high-mud content sand are used to replace high-quality natural sand. When the content of sand and mud is more than 2%, the prepared concrete needs more water, and the durability and the strength of the concrete can be reduced by more water. When the latest generation of polycarboxylic acid water reducing agent is used in concrete, the high mud content can obviously reduce the water reducing effect of the water reducing agent, so that the fluidity, such as slump and the expansion degree of fresh concrete are obviously reduced.

Aiming at the technical problems, the invention provides a mud inhibitor which has excellent mud resistance and mud resistance, can obviously improve the problem that the light weight, the fluidity and the slump of concrete are reduced due to high mud-containing sandstone, has a wide application range, and has excellent adsorption and viscosity reduction effects on various kinds of mud.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the invention provides a mud inhibitor, which comprises the following raw materials in parts by weight: 40-70 parts of anti-mud agent aqueous solution, 15-30 parts of retarder, 30-45 parts of polyhydroxy compound and 2-10 parts of air entraining agent.

As a preferable technical scheme, the raw materials for preparing the anti-mud agent aqueous solution comprise the following components in percentage by weight: 30-45% of cationic monomer, 5-15% of acrylate, 1-6% of unsaturated sulfonate compound, 0.1-2% of chain transfer agent, 5-10% of unsaturated ester compound, 5-10% of initiator and the balance of water to 100%.

In a preferred embodiment of the present invention, the cationic monomer is at least one selected from the group consisting of acryloyloxyethyltrimethyl ammonium chloride, methacryloyloxyethyltrimethyl ammonium chloride, and dimethyldiallylammonium chloride.

In a preferred embodiment of the present invention, the acrylate is at least one selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate and butyl methacrylate.

In a preferred embodiment of the present invention, the unsaturated sulfonate compound is at least one selected from sodium methallyl sulfonate and sodium propenyl sulfonate.

In a preferred embodiment of the present invention, the unsaturated ester compound is at least one selected from the group consisting of vinyl acetate, allyl acetate, vinyl propionate, vinyl butyrate, and allyl propionate.

In a preferred embodiment of the present invention, the initiator is at least one of ammonium persulfate, sodium persulfate, potassium persulfate, hydrogen peroxide, sodium formaldehyde sulfoxylate, and ascorbic acid.

As a preferable technical scheme of the invention, the preparation method of the anti-mud agent aqueous solution comprises the following steps:

(1) mixing a cationic monomer, acrylic ester, an unsaturated sulfonate compound, a chain transfer agent, an unsaturated ester compound and water, heating to 50-60 ℃ while stirring, and continuously stirring;

(2) dripping an initiator into the step (1), wherein the dripping time is not less than 150 min; after the dropwise addition is finished, heating to 60-70 ℃, and continuously stirring for 60-120 min; then adjusting the solid content to 35-50 wt%, and cooling to below 40 ℃ to obtain the product.

In a preferred embodiment of the present invention, the polyol is at least one selected from the group consisting of cellulose, starch and dextrin.

The second aspect of the invention provides a preparation method of the mud inhibitor, which comprises the following steps: and mixing and stirring the anti-mud agent aqueous solution, the retarder, the polyhydroxy compound and the air entraining agent uniformly to obtain the anti-mud agent.

Advantageous effects

The invention provides a mud inhibitor which has better mud resistance and mud resistance, can be added independently or mixed with concrete admixtures such as a water reducing agent, a water-retaining agent and the like for use, generates a synergistic effect with other concrete admixtures, and improves the mud resistance or mud resistance of the water reducing agent and the like. The mud inhibitor provided by the invention has extremely strong dispersibility and selective adsorption capacity, and has a good mud-resisting effect on different types of mud. Besides the double effects of strong adsorption and dispersion on layered clay (such as kaolin, bentonite, illite, mica and the like), the anti-mud agent also has good effect on non-layered clay (such as calcite, feldspar, dolomite and the like) in machine-made sand, and has good adaptability to different raw materials such as cement, sand, fly ash, mineral powder and the like, thereby having wide application range.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.

In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.

In order to solve the technical problems, the first aspect of the invention provides a mud inhibitor, which comprises the following raw materials in parts by weight: 40-70 parts of anti-mud agent aqueous solution, 15-30 parts of retarder, 30-45 parts of polyhydroxy compound and 2-10 parts of air entraining agent.

In a preferred embodiment, the preparation raw materials of the mud inhibitor comprise the following components in parts by weight: 60 parts of anti-mud agent aqueous solution, 20 parts of retarder, 40 parts of polyhydroxy compound and 5 parts of air entraining agent.

Anti-mud aqueous solution

In the invention, the raw materials for preparing the anti-mud agent aqueous solution comprise the following components in percentage by weight: 30-45% of cationic monomer, 5-15% of acrylate, 1-6% of unsaturated sulfonate compound, 0.1-2% of chain transfer agent, 5-10% of unsaturated ester compound, 5-10% of initiator and the balance of water to 100%.

In a preferred embodiment, the raw materials for preparing the anti-mud agent aqueous solution comprise the following components in percentage by weight: 35% of cationic monomer, 10% of acrylate, 4% of unsaturated sulfonate compound, 1.5% of chain transfer agent, 8% of unsaturated ester compound, 7% of initiator and the balance of water to 100%.

Cationic monomers

In the present invention, the cationic monomer is at least one selected from the group consisting of acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride and dimethyldiallylammonium chloride.

In a preferred embodiment, the cationic monomer is a combination of acryloyloxyethyltrimethylammonium chloride and dimethyldiallylammonium chloride.

In a more preferred embodiment, the weight ratio of acryloyloxyethyltrimethylammonium chloride to dimethyldiallylammonium chloride is 1: (0.5-1.5).

In a more preferred embodiment, the weight ratio of acryloyloxyethyltrimethylammonium chloride to dimethyldiallylammonium chloride is 1: 1.

acrylic esters

In the present invention, the acrylate is at least one selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate.

In a preferred embodiment, the acrylate is a combination of hydroxypropyl acrylate, methyl acrylate and ethyl acrylate.

In a preferred embodiment, the weight ratio of hydroxypropyl acrylate, methyl acrylate and ethyl acrylate is 1: (0.5-1): (0.1-0.5).

In a more preferred embodiment, the weight ratio of hydroxypropyl acrylate, methyl acrylate and ethyl acrylate is 1: 0.7: 0.2.

unsaturated sulfonate compound

In the present invention, the unsaturated sulfonate compound is at least one selected from sodium methallyl sulfonate and sodium propenyl sulfonate.

In a preferred embodiment, the unsaturated sulfonate compound is sodium propenyl sulfonate.

Chain transfer agent

In the present invention, the chain transfer agent includes at least one mercapto group or hydroxyl group.

The chain transfer agent is not particularly limited, and mercaptoacetic acid, mercaptopropionic acid, alcohol compounds, and the like can be mentioned.

Unsaturated ester compound

In the invention, the unsaturated ester compound is at least one selected from vinyl acetate, allyl acetate, vinyl propionate, vinyl butyrate and allyl propionate.

In a preferred embodiment, the unsaturated ester compound is a combination of vinyl acetate and propylene acetate.

In a more preferred embodiment, the weight ratio of vinyl acetate to propylene acetate is 1: (0.1-1).

In a more preferred embodiment, the weight ratio of vinyl acetate to propylene acetate is 1: 0.3.

initiator

In the present invention, the initiator is not particularly limited.

In a preferred embodiment, the initiator is at least one of ammonium persulfate, sodium persulfate, potassium persulfate, hydrogen peroxide, sodium formaldehyde sulfoxylate, and ascorbic acid.

In a more preferred embodiment, the initiator is sodium persulfate.

Water (W)

In the present invention, the water is not particularly limited, and deionized water, distilled water and the like can be mentioned.

In the invention, the preparation method of the anti-mud agent aqueous solution comprises the following steps:

(1) mixing a cationic monomer, acrylic ester, an unsaturated sulfonate compound, a chain transfer agent, an unsaturated ester compound and water, heating to 50-60 ℃ while stirring, and continuously stirring;

(2) dripping an initiator into the step (1), wherein the dripping time is not less than 150 min; after the dropwise addition is finished, heating to 60-70 ℃, and continuously stirring for 60-120 min; then adjusting the solid content to 35-50 wt%, and cooling to below 40 ℃ to obtain the product.

In a preferred embodiment, the preparation method of the anti-mud agent aqueous solution comprises the following steps:

(1) mixing a cationic monomer, acrylic ester, an unsaturated sulfonate compound, a chain transfer agent, an unsaturated ester compound and water, heating to 55 ℃ while stirring, and continuously stirring;

(2) dropwise adding an aqueous solution of an initiator into the step (1), wherein the dropwise adding time is not less than 150 min; after the dropwise addition is finished, heating to 65 ℃, and continuously stirring for 120 min; then adjusting the solid content to 40 wt%, and cooling to below 40 ℃ to obtain the product.

Retarder

In the invention, the retarder is at least one selected from sugar calcium, gluconate, citric acid and salts thereof, tartaric acid and salts thereof, zinc salt, phosphate and lignosulfonate.

In a preferred embodiment, the retarder is sodium gluconate.

Polyhydroxy compounds

In the present invention, the polyol is at least one selected from the group consisting of cellulose, starch and dextrin.

In a preferred embodiment, the polyhydroxy compound is dextrin.

In a more preferred embodiment, the polyol is maltodextrin.

In a preferred embodiment, the maltodextrin has a DE value of 10 to 15.

In the present invention, the source of the maltodextrin is not particularly limited, and it is commercially available from Biotech Co., Ltd, Dongxing.

Air entraining agent

In the present invention, the air-entraining agent is at least one selected from the group consisting of rosin resins, alkylbenzenesulfonates and fatty alcohol sulfonates.

In a preferred embodiment, the air entraining agent is an alkyl benzene sulfonate.

In a preferred embodiment, the air entraining agent is sodium dodecylbenzenesulfonate.

In the invention, the raw materials for preparing the mud inhibitor comprise but are not limited to the components, and ammonium alum, sodium metabisulfite, sodium sulfite, sodium polyphosphate and the like can also be included.

The second aspect of the invention provides a preparation method of the mud inhibitor, which comprises the following steps: and mixing and stirring the anti-mud agent aqueous solution, the retarder, the polyhydroxy compound and the air entraining agent uniformly to obtain the anti-mud agent.

The invention provides a mud inhibitor, which adopts a self-made mud inhibitor aqueous solution, and reduces the water absorption rate of mud particles after molecules are adsorbed on the surfaces of the mud particles by introducing an ester monomer, a cationic monomer and sulfonate into the molecular structure of the mud inhibitor, so that the water requirement of concrete is reduced; meanwhile, the mud inhibitor molecules have a branched chain structure, and the branched chain can effectively reduce the possibility that mud particles are close to coagulation gel, so that a mud-containing concrete system has good fluidity and has a good effect on common sand and stone materials, particularly high mud-containing sand and stone materials; meanwhile, the concrete admixture can be compounded with other concrete admixtures for use, so that a synergistic effect is achieved. In addition, a certain amount of maltodextrin is compounded, so that the cost of the mud inhibitor is reduced, the mud inhibitor is free from pollution, the molecules of the maltodextrin are of a dendritic structure, the dispersing capacity is stronger and more durable, the defects of low water reducing rate, poor slump retaining performance and poor mud resistance of the conventional polycarboxylic acid water reducing agent are overcome, and the problem that the molecular structure of the multi-branched polycarboxylic acid water reducing agent prepared by the conventional free radical polymerization is undefined is solved, so that the water demand of concrete is further reduced. The mud inhibitor provided by the invention has extremely strong dispersibility and selective adsorption capacity, and has a good mud-resisting effect on different types of mud. Besides the double effects of strong adsorption and dispersion on layered clay (such as kaolin, bentonite, illite, mica and the like), the composite material also has good effects on non-layered clay (such as calcite, feldspar, dolomite and the like) in the machine-made sand. And the anti-mud agent has good adaptability to different raw materials such as cement, sand, fly ash and mineral powder, and has wide application range.

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

In addition, the starting materials used are all commercially available, unless otherwise specified.