阅读说明：本技术 一种混凝土减胶剂及其制备方法 (Concrete glue reducing agent and preparation method thereof ) 是由 庞森林 庞永献 易钢招 于 2020-03-03 设计创作，主要内容包括：本发明公开了一种混凝土减胶剂及其制备方法,涉及混凝土外加剂技术领域,其技术方案要点是一种混凝土减胶剂,由母液与水稀释后制得,以100重量份母液计,包括如下组分：混合醇胺45-55份、无水偏硅酸钠4-6份、硅酸锂5-7份、甲基硅酸钠15-20份,余量为水。本发明的混凝土减胶剂,具有可以降低水泥用量、提高混凝土拌合物的流动性以及水泥对骨料的包裹性,从而改善混凝土的和易性的优点。(The invention discloses a concrete gel reducing agent and a preparation method thereof, relating to the technical field of concrete admixtures, and the technical scheme is that the concrete gel reducing agent is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate and the balance of water. The concrete glue reducing agent has the advantages of reducing the using amount of cement, improving the fluidity of concrete mixture and the wrapping property of cement to aggregate, thereby improving the workability of concrete.)

1. A concrete gel reducing agent is characterized in that: the aqueous emulsion is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate and the balance of water.

2. The concrete gel reducing agent of claim 1, wherein: the aqueous emulsion is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 50 parts of mixed alcohol amine, 5 parts of anhydrous sodium metasilicate, 6 parts of lithium silicate, 18 parts of sodium methyl silicate and the balance of water.

3. The concrete gel reducing agent of claim 1, wherein: the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1.125: 1.

4. The concrete gel reducing agent according to any one of claims 1 to 3, wherein: the mother liquor also comprises 3-5 parts of polycarboxylic acid water reducing agent;

the polycarboxylic acid water reducing agent is prepared from the following raw materials, by weight, 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of α -sodium alkenyl sulfonate, 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 40-60 parts of methallyl alcohol polyoxyethylene ether.

5. The concrete water reducer according to claim 4, wherein the polycarboxylic acid water reducer is prepared by uniformly stirring ① parts by weight of 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of α -sodium alkenyl sulfonate and 50-60 parts of water to obtain a mixed solution A;

② taking 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 10-15 parts of water, and stirring uniformly to obtain a mixed solution B;

③ heating 40-60 parts of methallyl alcohol polyoxyethylene ether and 50-70 parts of water to 45-50 ℃, adding the mixed solution B, stirring for 1-2h, adding the mixed solution A, dropwise adding for 3-4h, then adding 100 parts of water, stirring for 3-4h at 45-50 ℃, keeping the temperature, and adding alkali liquor to adjust the pH of the system to 6-8 to obtain the polycarboxylic water reducer.

6. The concrete glue reducer of claim 5, wherein: the chain transfer agent is one of mercaptopropionic acid and mercaptoacetic acid.

7. The concrete glue reducer of claim 5, wherein: the initiator is formed by mixing ammonium persulfate and ascorbic acid in a weight ratio of 3: 1.

8. A method for preparing the concrete gel reducing agent according to any one of claims 1 to 7, wherein: the method comprises the following steps:

s1, adding anhydrous sodium metasilicate and sodium methylsilicate into a certain amount of water according to a proportion, and uniformly stirring to obtain a mixed solution;

s2, adding mixed alcohol amine and lithium silicate into the mixed solution, and uniformly stirring to obtain mother solution;

and S3, adding water into the mother liquor for dilution to obtain the concrete glue reducing agent.

9. The preparation method of the concrete gel reducing agent according to claim 8, wherein the concrete gel reducing agent comprises the following steps: the stirring speed in S2 is 200-600r/min, and the stirring time is 20-30 min.

10. The preparation method of the concrete gel reducing agent according to claim 8, wherein the concrete gel reducing agent comprises the following steps: the ratio of mother liquor to water in S3 was 1: 14.

Technical Field

The invention relates to the technical field of concrete admixtures, in particular to a concrete glue reducing agent and a preparation method thereof.

Background

The common concrete is artificial stone which is prepared by taking cement as a main cementing material, mixing with water, sand, stones and a certain amount of chemical additives and mineral admixtures as necessary according to a proper proportion, and stirring, compacting, molding, curing and hardening. The concrete is a novel concrete additive different from a concrete water reducing agent, and the glue reducing agent is also called a concrete synergist or a concrete synergist, and has the main effects of improving the workability of the concrete, increasing the overall glue amount of the concrete, promoting the hydration reaction of the cement to be more sufficient, reducing the using amount of the cement or other cementing materials, and further reducing the problems of concrete surface cracks and the like caused by cement hydration heat.

Disclosure of Invention

In view of the defects of the prior art, the first object of the invention is to provide a concrete gel reducing agent which has the advantages of reducing the using amount of cement, improving the fluidity of concrete mixture and the wrapping property of cement to aggregate, thereby improving the workability of concrete.

The second purpose of the invention is to provide a preparation method of the coagulation gel reducer, which has the advantages of simple operation and high production efficiency.

In order to achieve the first object, the invention provides the following technical scheme: the concrete gel reducing agent is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate and the balance of water.

By adopting the technical scheme, the anhydrous sodium metasilicate, the lithium silicate and the sodium methylsilicate belong to silicate, and the aqueous solution of the silicate is alkalescent; the glue reducing agent obtained by combining the mixed alcohol amine with the silicate has good stability; the stone powder of the machine-made sand is generally calcareous stone powder and siliceous stone powder, and the increase of the content of the stone powder can improve the water absorption, influence the dispersibility of cement particles and increase the viscosity of concrete mixtures; through the matching of sodium metasilicate, lithium silicate and sodium methylsilicate, the siliceous stone powder can form a stable microcolloid after being combined with water so as to inhibit the combination of part of stone powder and cement, and the dispersion of mixed alcohol amine on cement particles is facilitated; the micro colloid formed by the siliceous stone powder is in a crystalline state, and can further stimulate the hydration action of the mixed alcohol amine on minerals in the cement, so that the concrete has good early strength and later strength through the action of different hydration products; through the cooperation of sodium metasilicate, methyl sodium silicate and mixed alcohol amine, can improve the permeability of mixed alcohol amine in cement, make it promote cement to carry out hydration reaction fast to improve the dispersibility of cement granule, effectively improve the utilization ratio of cement granule, under the prerequisite that reduces the cement quantity, improve the wrapping nature of cement to the aggregate, reduce the circumstances such as segregation, the bleeding of concrete, be favorable to improving the mobility of concrete mixture, improve its workability.

Further, the aqueous polyurethane emulsion is prepared by diluting mother liquor with water, and comprises the following components in 100 parts by weight of the mother liquor: 50 parts of mixed alcohol amine, 5 parts of anhydrous sodium metasilicate, 6 parts of lithium silicate, 18 parts of sodium methyl silicate and the balance of water.

By adopting the technical scheme, the prepared mother liquor is reasonable in proportion, the dispersibility of cement particles can be improved, the utilization rate of the cement particles is effectively improved, the wrapping property of cement to aggregate is improved on the premise of reducing the cement using amount, the segregation and bleeding of concrete are reduced, the improvement on the fluidity of concrete mixtures is facilitated, and the workability of the concrete mixtures is improved.

Further, the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1.125: 1.

By adopting the technical scheme, the mixed alcohol amine obtained by mixing the triethanolamine, the triisopropanolamine and the diethanolamine is used as the main component of the concrete gel reducing agent, so that the micro-dispersion effect can be generated on cement particles; the triethanolamine has the effect of promoting mineral dissolution and can promote the formation of C-S-H gel; triisopropanolamine can promote hydration of ferrite which is difficult to hydrate so as to promote hydration degree of cement minerals, and for machine-made sand concrete with high stone powder content, triethanolamine, triisopropanolamine and diethanolamine are compounded in a ratio of 1:1.125:1, and the existence of the diethanolamine can promote activity of the triethanolamine and the triisopropanolamine, so that cement particles can be rapidly dispersed, influence of machine-made sand powder and dispersion of the cement particles is inhibited, hydration reaction of cement is improved, utilization rate of the cement is improved, and wrapping property of the cement on aggregates is improved on the premise of reducing cement consumption.

Further, the mother liquor also comprises 3-5 parts of polycarboxylic acid water reducing agent;

the polycarboxylic acid water reducing agent is prepared from the following raw materials, by weight, 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of α -sodium alkenyl sulfonate, 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 40-60 parts of methallyl alcohol polyoxyethylene ether.

By adopting the technical scheme, the polycarboxylic acid water reducing agent has the advantage of high water reducing rate, can effectively reduce the water demand of concrete, can play a role in reducing water by adding the polycarboxylic acid water reducing agent into the water reducing agent, improves the fluidity, cohesiveness and water-retaining property of concrete mixtures, and effectively improves the workability of concrete; and the dosage of the external water reducing agent in the concrete formula can be reduced, even no additional water reducing agent is needed to be added, the problem of poor adaptability of the glue reducing agent and different types of external water reducing agents is solved, and the design of the concrete formula is simpler and more reasonable.

①, taking 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of α -sodium alkenyl sulfonate and 50-60 parts of water by weight, and uniformly stirring to obtain a mixed solution A;

② taking 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 10-15 parts of water, and stirring uniformly to obtain a mixed solution B;

③ heating 40-60 parts of methallyl alcohol polyoxyethylene ether and 50-70 parts of water to 45-50 ℃, adding the mixed solution B, stirring for 1-2h, adding the mixed solution A, dropwise adding for 3-4h, then adding 100 parts of water, stirring for 3-4h at 45-50 ℃, keeping the temperature, and adding alkali liquor to adjust the pH of the system to 6-8 to obtain the polycarboxylic water reducer.

By adopting the technical scheme, the methyl allyl alcohol polyoxyethylene ether and the monomer are subjected to polymerization reaction under the action of the chain transfer agent, the operation is simple, and the realization is easy.

Further, the chain transfer agent is one of mercaptopropionic acid and mercaptoacetic acid.

Further, the initiator is formed by mixing ammonium persulfate and ascorbic acid in a weight ratio of 3: 1.

In order to achieve the second object, the invention provides the following technical scheme: a preparation method of the concrete gel reducing agent comprises the following steps:

s1, adding anhydrous sodium metasilicate and sodium methylsilicate into a certain amount of water according to a proportion, and uniformly stirring to obtain a mixed solution;

s2, adding mixed alcohol amine and lithium silicate into the mixed solution, and uniformly stirring to obtain mother solution;

and S3, adding water into the mother liquor for dilution to obtain the concrete glue reducing agent.

By adopting the technical scheme, the anhydrous sodium metasilicate and the sodium methylsilicate are mixed and then added with the mixed alcohol amine and the lithium silicate in sequence, and the obtained gel reducing agent has stable performance and simple operation.

Further, the stirring speed in S2 is 200-600r/min, and the stirring time is 20-30 min.

By adopting the technical scheme, the raw materials are stirred at the speed of 200-600r/min, so that the raw materials can be fully dispersed in water to form a stable alkaline micro-colloidal solution.

Further, the ratio of mother liquor to water in S3 was 1: 14.

By adopting the technical scheme, the mother liquor and the water are mixed and diluted according to the proportion of 1:14, and the prepared glue reducing agent has good adaptability to concrete with different proportions.

In summary, compared with the prior art, the invention has the following beneficial effects:

1. the dispersion of the mixed alcohol amine to cement particles can be improved by the matching of the sodium metasilicate, the lithium silicate and the sodium methylsilicate, the hydration action of the mixed alcohol amine to minerals in the cement is further stimulated, and the concrete has good early strength and later strength by the action of different hydration products; the permeability of the mixed alcohol amine in the cement can be improved by matching the sodium metasilicate, the sodium methylsilicate and the mixed alcohol amine, so that the cement can be promoted to rapidly carry out hydration reaction, the dispersibility of cement particles is improved, the utilization rate of the cement particles is effectively improved, the wrapping property of the cement to the aggregate is improved on the premise of reducing the using amount of the cement, the conditions of segregation, bleeding and the like of the concrete are reduced, the improvement of the fluidity of a concrete mixture is facilitated, and the workability of the concrete mixture is improved;

2. after triethanolamine, triisopropanolamine and diethanolamine are compounded in a ratio of 1:1.125:1, the existence of the diethanolamine can promote the activity of the triethanolamine and the triisopropanolamine, so that the triethanolamine and the triisopropanolamine can be rapidly dispersed in cement particles, and the influence of machine-made sandstone powder and the dispersibility of the cement particles is inhibited, so that the hydration reaction of cement is improved, the utilization rate of the cement is improved, and the wrapping property of the cement on aggregate is improved on the premise of reducing the cement consumption;

3. the polycarboxylic acid water reducing agent has the advantage of high water reducing rate, can effectively reduce the water demand of concrete, can play a role of reducing water by adding the polycarboxylic acid water reducing agent into the water reducing agent, improves the fluidity, cohesiveness and water retention of concrete mixtures, and effectively improves the workability of the concrete; and the dosage of the external water reducing agent in the concrete formula can be reduced, even no additional water reducing agent is needed to be added, the problem of poor adaptability of the glue reducing agent and different types of external water reducing agents is solved, and the design of the concrete formula is simpler and more reasonable.

Detailed Description

The present invention will be described in further detail below.

Preparation example of polycarboxylic acid Water reducing agent

Preparation example 1 of a polycarboxylic acid-based Water reducing agent ① A mixture A was obtained by uniformly stirring 12.5kg of acrylic acid, 4kg of acrylamide, 1.5kg of hydroxyethyl methacrylate, 0.3kg of isobutyl methacrylate, 2.5kg of sodium methallylsulfonate, 0.25kg of α -sodium alkenylsulfonate and 55kg of water;

②, uniformly stirring 0.15kg of mercaptopropionic acid, 0.3kg of ammonium persulfate, 0.1kg of ascorbic acid and 12.5kg of water to obtain a mixed solution B;

③ heating 50kg of methallyl alcohol polyoxyethylene ether and 60kg of water to 48 ℃, adding the mixed solution B, stirring for 1.5h, adding the mixed solution A, dropwise adding for 3.5h, then adding 100kg of water, stirring for 3.5h at 48 ℃, adding 10 wt% of sodium hydroxide solution, and adjusting the pH of the system to 7 to obtain the polycarboxylic acid water reducer.

Preparation example 2 of a polycarboxylic acid water reducing agent ① A mixture A was obtained by uniformly stirring 10kg of acrylic acid, 3kg of acrylamide, 1kg of hydroxyethyl methacrylate, 0.2kg of isobutyl methacrylate, 2kg of sodium methallylsulfonate, 0.2kg of α -sodium alkenylsulfonate and 50kg of water;

②, uniformly stirring 0.1kg of thioglycolic acid, 0.225kg of ammonium persulfate, 0.075kg of ascorbic acid and 10kg of water to obtain a mixed solution B;

③ heating 40kg of methallyl alcohol polyoxyethylene ether and 50kg of water to 45 ℃, adding the mixed solution B, stirring for 1h, adding the mixed solution A, dropwise adding for 3h, then adding 100kg of water, stirring for 3h at 45 ℃, adding 10 wt% of sodium hydroxide solution, and adjusting the pH of the system to 6 to obtain the polycarboxylic acid water reducer.

Preparation example 3 of a polycarboxylic acid-based Water reducing agent ① A mixture A was obtained by uniformly stirring 15kg of acrylic acid, 5kg of acrylamide, 2kg of hydroxyethyl methacrylate, 0.4kg of isobutyl methacrylate, 3kg of sodium methallylsulfonate, 0.3kg of α -sodium alkenylsulfonate and 60kg of water;

②, uniformly stirring 0.2kg of mercaptopropionic acid, 0.375kg of ammonium persulfate, 0.125kg of ascorbic acid and 15kg of water to obtain a mixed solution B;

③ heating 60kg of methallyl alcohol polyoxyethylene ether and 70kg of water to 50 ℃, adding the mixed solution B, stirring for 2h, adding the mixed solution A, dropwise adding for 4h, then adding 100kg of water, stirring for 4h at 50 ℃, adding 10 wt% of sodium hydroxide solution, and adjusting the pH of the system to 8 to obtain the polycarboxylic acid water reducer.