阅读说明：本技术 一种混凝土胶凝材料调节剂及其制备方法 (Concrete cementing material regulator and preparation method thereof ) 是由 庞永献 庞森林 易钢招 于 2020-03-03 设计创作，主要内容包括：本发明涉及一种混凝土胶凝材料调节剂及其制备方法,调节剂以1000kg计,包括以下重量份的组分：混合醇胺接枝物475-520kg、硫氰酸钠80-120kg、分散稳定剂40-60kg、多酚化合物40-70kg以及交联聚维酮3-6kg,余量为水；制备方法包括以下步骤：S1.先向搅拌罐中加入水,再加入分散稳定剂与硫氰酸钠,对两种组分进行充分搅拌至其完全溶解于水中；S2.再向搅拌罐中依次加入三乙醇胺接枝物、三异丙醇胺接枝物、二乙醇胺接枝物、交联聚维酮以及多酚化合物,搅拌15-25min,制得成品母液；S3.最后按1：12的比例用水稀释成品母液,搅拌均匀后制得混凝土胶凝材料调节剂成品。本发明提高混凝土胶凝材料分散性能的效果。(The invention relates to a concrete cementing material regulator and a preparation method thereof, wherein the regulator comprises the following components in parts by weight in 1000 kg: 520kg of mixed alcohol amine graft 475-; the preparation method comprises the following steps: s1, adding water into a stirring tank, adding a dispersion stabilizer and sodium thiocyanate, and fully stirring the two components until the two components are completely dissolved in the water; s2, sequentially adding triethanolamine graft, triisopropanolamine graft, diethanolamine graft, crospovidone and polyphenol compound into the stirring tank, and stirring for 15-25min to obtain a finished mother solution; s3, finally, according to the following steps of 1: and (12) diluting the finished product mother liquor with water in a ratio of, and uniformly stirring to obtain the finished product of the concrete cementing material regulator. The invention improves the dispersion performance of the concrete cementing material.)

1. A concrete cementing material regulator comprises the following components in parts by weight, calculated by 1000 kg: 520kg of mixed alcohol amine graft 475-.

2. A concrete cement modifier according to claim 1, wherein: the graft is hydroxypropyl methyl cellulose.

3. A concrete cement modifier according to claim 1, wherein: the mixed alcohol amine graft comprises a triethanolamine graft, a triisopropanolamine graft and a diethanolamine graft.

4. A concrete cement modifier according to claim 3, wherein: the triethanolamine graft, the triisopropanolamine graft and the diethanolamine graft are prepared from the following components in percentage by mass: (1.06-1.18): (0.93-1.08).

5. A concrete cement modifier according to claim 1, wherein: the components also comprise 3-6kg of crospovidone and 40-70kg of polyphenol compounds.

6. A concrete cement modifier according to claim 1, wherein: the polyphenol compound is tert-butyl phenol.

7. The preparation method of the concrete cementing material regulator according to claim 1, wherein the concrete cementing material regulator comprises the following steps: the dispersion stabilizer is sodium metasilicate anhydrous.

8. A method of preparing a concrete cementitious material conditioner as claimed in any one of claims 1 to 7, comprising the steps of:

s1, adding water into a stirring tank, adding a dispersion stabilizer and sodium thiocyanate, and fully stirring the two components until the two components are completely dissolved in the water;

s2, sequentially adding triethanolamine graft, triisopropanolamine graft, diethanolamine graft, crospovidone and polyphenol compound into the stirring tank, and stirring for 15-25min to obtain a finished mother solution;

s3, finally, according to the following steps of 1: and (12) diluting the finished product mother liquor with water in a ratio of, and uniformly stirring to obtain the finished product of the concrete cementing material regulator.

Technical Field

The invention relates to the technical field of concrete additives and preparation thereof, in particular to a concrete cementing material regulator and a preparation method thereof.

Background

The existing concrete gelled material has fine particles, and when the concrete gelled material meets mixing water, the gelled material particles are mutually attracted under the action of electrostatic attraction and the like, so that a three-dimensional flocculation structure is formed. About 10% -30% of the mixing water is wrapped in the flocculation structure and can not freely flow, so that the lubricating effect is lost, and the fluidity of the mixture is greatly reduced. The common water reducing agent can not effectively disperse the flocculation structures of the ultrafine particles, and according to research, the concrete cementing material regulator can disperse the flocculation structures, so that the cementing material particles are more fully contacted with water, and the reaction activity of the concrete cementing material regulator is improved. The concrete cementing material regulator can also fully activate mineral admixtures with potential activity, thereby improving the hydration degree of the cementing material and achieving the purpose of improving the concrete strength or reducing the dosage of the cementing material.

The concrete cementing material regulator is also called concrete gel reducing agent or concrete synergist, and is a chemical admixture capable of effectively reducing the dosage of a cementing material under the conditions that the water-gel ratio is basically unchanged, and the slump and 28d compressive strength of concrete are not reduced. The concrete cementing material regulator is a novel concrete admixture different from a concrete water reducing agent, is mostly colorless, light yellow or light brown semitransparent liquid in form, generally has no chlorine or alkali, and is mainly characterized in that the cement dosage can be reduced by 5-10% under the condition of ensuring the same concrete strength grade, the mechanical strength of the concrete is not reduced, and meanwhile, the workability and the volume stability of the concrete are improved in different degrees. The concrete cementing material regulator has the characteristics of proper selling price, low mixing amount, good compatibility with other additives and the like, so the cost performance advantage is obvious.

The common concrete gelled material regulator components mainly play a role in alcohol amine type cation small monomers, utilize the electrostatic repulsion that the cation small monomers are adsorbed on the surface of negatively charged gelled material particles to achieve the effect of dispersing a flocculation structure, and the dispersing effect has certain limitation. The common concrete cementing material regulator only depends on the characteristic of dispersing capacity brought by electrostatic repulsion, the development and application range of the gel reducing agent is limited to a certain extent, and the problems of adaptability, matching with the water reducing agent and the like limit the large-scale application and popularization of the gel reducing agent.

Disclosure of Invention

In view of the defects of the prior art, one of the purposes of the invention is to provide a concrete cementing material regulator which has the effect of improving the dispersion performance of the concrete cementing material.

The invention also aims to provide a preparation method of the concrete cementing material regulator.

The above object of the present invention is achieved by the following technical solutions:

a concrete cementing material regulator comprises the following components in parts by weight, calculated by 1000 kg: 520kg of mixed alcohol amine graft 475-.

By adopting the technical scheme, the graft group is introduced into the hydroxyl group of the mixed alcohol amine to generate a certain steric hindrance effect, the electrostatic repulsion force brought by the adsorption of the mixed alcohol amine cation small monomer on the surface of the negatively charged cementing material particle is utilized to achieve the effect of a dispersed flocculation structure, and the steric hindrance effect is utilized to achieve the effect of the dispersed flocculation structure, so that the dispersing performance of the regulator on the cementing material is improved, and the stability of each performance of the concrete is ensured while the consumption of the cementing material is reduced by the regulator.

The present invention in a preferred example may be further configured to: the graft is hydroxypropyl methyl cellulose.

By adopting the technical scheme, the hydroxypropyl methyl cellulose has larger molecular groups and is grafted on the molecular ligand of the mixed alcohol amine, so that the formation of a steric hindrance effect is ensured;

the molecular structure of the hydroxypropyl methyl cellulose has a plurality of hydroxyl groups, so that the hydroxypropyl methyl cellulose has good water retention performance, and concrete segregation and bleeding caused by adding a regulator are avoided;

the hydroxypropyl methyl cellulose also has certain adsorption performance, can be adsorbed on the particles of the gel material to generate a certain micro-dispersion effect, thereby improving the gel reduction effect of the regulator.

The present invention in a preferred example may be further configured to: the mixed alcohol amine graft comprises a triethanolamine graft, a triisopropanolamine graft and a diethanolamine graft.

The present invention in a preferred example may be further configured to: the triethanolamine graft, the triisopropanolamine graft and the diethanolamine graft are prepared from the following components in percentage by mass: (1.06-1.18): (0.93-1.08).

By adopting the technical scheme, the addition ratio of the triethanolamine, the triisopropanolamine and the diethanolamine is controlled, so that the regulator can obtain the best glue reducing effect.

The present invention in a preferred example may be further configured to: the components also comprise 3-6kg of crospovidone and 40-70kg of polyphenol compounds.

By adopting the technical scheme, the crospovidone has extremely high specific surface area, high selective adsorbability on polyphenol compounds, and capability of carrying out complex reaction with the polyphenol compounds, and the formed complex has a certain steric hindrance effect, thereby being beneficial to further improving the dispersion performance of the regulator on the gelled material.

The present invention in a preferred example may be further configured to: the polyphenol compound is tert-butyl phenol.

By adopting the technical scheme, the tert-butyl phenol molecule group contains tert-butyl, and the special structure of the tert-butyl ensures that the tert-butyl phenol molecule group has better steric hindrance effect compared with other polyphenol compounds, so that the polyphenol compound has certain steric hindrance effect, and simultaneously the complex compound has good steric hindrance effect, thereby ensuring the dispersing performance of the regulator on the gelled material.

The present invention in a preferred example may be further configured to: the dispersion stabilizer is sodium metasilicate anhydrous.

By adopting the technical scheme, the total alkali content and the total silicon dioxide content of the zero-water sodium metasilicate are more than or equal to 94 percent, and compared with the hydrated sodium metasilicate, the binding capacity of the zero-water sodium metasilicate to Ca and Mg ions in concrete is improved, the pH value of the concrete is favorably adjusted and stabilized, and the performance of a surfactant is improved; the zero-water sodium metasilicate does not separate out crystal water, and has unique compatibility and stability for each component in the formula; the zero-water sodium metasilicate is cheap and easy to obtain, and is beneficial to reducing the production cost.

The second aim of the invention is realized by the following technical scheme:

a preparation method of a concrete cementing material regulator comprises the following steps:

s1, adding water into a stirring tank, adding a dispersion stabilizer and sodium thiocyanate, and fully stirring the two components until the two components are completely dissolved in the water;

s2, sequentially adding triethanolamine graft, triisopropanolamine graft, diethanolamine graft, crospovidone and polyphenol compound into the stirring tank, and stirring for 15-25min to obtain a finished mother solution;

s3, finally, according to the following steps of 1: and (12) diluting the finished product mother liquor with water in a ratio of, and uniformly stirring to obtain the finished product of the concrete cementing material regulator.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the mixed alcohol amine graft not only has electrostatic repulsion force caused by the adsorption of the small cationic monomer on the surface of the negatively charged gelled material particles, but also has a certain steric hindrance effect, and both are beneficial to improving the dispersion effect of the regulator on the flocculation structure, so that the dispersion performance of the regulator on the gelled material is improved;

2. the hydroxypropyl methyl cellulose has larger molecular group, and is grafted on the molecular ligand of the mixed alcohol amine to be beneficial to ensuring the formation of steric hindrance effect; the molecular structure of the hydroxypropyl methyl cellulose has a plurality of hydroxyl groups, so that the hydroxypropyl methyl cellulose has good water retention performance, and concrete segregation and bleeding caused by adding a regulator are avoided;

3. the polyvinylpolypyrrolidone has extremely high specific surface area and high selective adsorption to polyphenol compounds, can perform complex reaction with the polyphenol compounds, and the formed complex has certain steric hindrance effect, thereby being beneficial to further improving the dispersion performance of the regulator on the gelled material.

Detailed Description