Environmentally friendly release agent for hard water resistant concrete, its preparation method and application

Abstract

This invention relates to the field of cement-based building material admixtures, and in particular to an environmentally friendly hard water resistant concrete release agent, its preparation method, and its application. The release agent is prepared by mixing base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester, and liquid alkali as raw materials. This release agent not only has excellent release properties, but also ensures that the concrete surface is free of harmful pores and color differences after formwork removal, and the formwork is easy to clean. It also exhibits good emulsification properties in hard water environments and is non-toxic and harmless to the surrounding environment.

Description

Technical Field

[0001] This invention relates to the field of cement-based building material admixtures, and in particular to an environmentally friendly release agent for hard water-resistant concrete, its preparation method, and its application. Background Technology

[0002] To achieve a smooth and aesthetically pleasing surface in buildings, release agents are often applied or sprayed onto the formwork during concrete pouring. Release agents have undergone several technological iterations. Since the 1980s and 1990s, emulsion-based release agents have been used. In 1992, my country was granted its first invention patent for a concrete release agent. It has good release effect, simple process, and low cost, and is currently widely used.

[0003] Emulsion-based release agents are classified into lubricating oil emulsions, paraffin emulsions, and silicone emulsions. However, in current construction processes, the production of concrete products mostly uses waste engine oil, paraffin, or even recycled gutter oil as release agents. The quality of release agents prepared from these raw materials is unstable, affecting the structural strength of concrete, the quality of buildings, and the safety of personnel. Furthermore, due to the limitations of raw materials at construction sites, hard water is often used as a dilution solution during the use of release agents. The high calcium and magnesium ions in hard water can cause the release agent to fail to emulsify properly, ultimately affecting the appearance of the concrete structure. Moreover, the use of release agents such as waste engine oil can easily lead to poor concrete color, numerous pores, and easy peeling, hollowing, and detachment during secondary construction. Residual release agents can also cause environmental pollution. Summary of the Invention

[0004] To address the problems in existing technologies, this invention provides an environmentally friendly hard water resistant concrete release agent. It is formulated by mixing base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester, and liquid alkali. This release agent not only exhibits excellent release properties, but also ensures that the concrete surface is free of harmful pores and color differences after formwork removal, and that the formwork is easy to clean. Furthermore, it demonstrates good emulsification properties even in hard water environments and is non-toxic and harmless to the surrounding environment.

[0005] Specifically, the present invention provides an environmentally friendly release agent for hard water-resistant concrete, which is composed of the following raw materials in parts by weight: 82-86 parts base oil, 6-8 parts modified triethanolamine, 2-3 parts modified sodium petroleum sulfonate, 2-4 parts alkylphenol polyoxyethylene ether, 4-6 parts dehydrated sorbitan fatty acid ester, and 0.1-0.5 parts liquid alkali.

[0006] Preferably, the modified triethanolamine preparation process is as follows: oleic acid is added to a container, the temperature is raised, triethanolamine is added dropwise, and the temperature is maintained to obtain the product.

[0007] More preferably, in the modified triethanolamine preparation process, the mass ratio of oleic acid to triethanolamine is (3-4):(6-7).

[0008] More preferably, in the modified triethanolamine preparation process, the temperature is raised to 70±10℃, the triethanolamine is added dropwise for 1-2 hours, and the holding time is 2-3 hours.

[0009] Modified triethanolamine has superior emulsifying properties, enabling more effective emulsification, and also provides short-term rust prevention, protecting the surface of metal molds from corrosion.

[0010] Preferably, the modified sodium petroleum sulfonate preparation process is as follows: add reduced-temperature distillate oil to a container, heat, add furfural to extract the oil, keep warm, dilute with water, add alkali solution to neutralize to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product.

[0011] More preferably, in the modified petroleum sulfonate preparation process, the mass ratio of reduced-density distillate oil to furfural extract oil is (3-4):10.

[0012] Modified sodium petroleum sulfonate has better resistance to hard water. The release agent can emulsify well in hard water environment. The addition of liquid alkali makes the release agent weakly alkaline, which can improve the release performance of the product and improve its appearance quality.

[0013] More preferably, in the preparation process of modified sodium petroleum sulfonate, the temperature is raised to 40±10℃, the furfural extraction oil is added dropwise for 0.5-1h, and the temperature is maintained for 1-2h.

[0014] Preferably, the base oil is 50# white oil.

[0015] The present invention also relates to a method for preparing the above-mentioned environmentally friendly hard water resistant concrete release agent, specifically including the following steps: adding base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester and liquid alkali to a mixing tank in sequence, and stirring evenly to obtain the final product.

[0016] Preferably, the stirring speed is 2800-3200 r / min and the stirring time is 20-30 min.

[0017] This invention also relates to the application of the above-mentioned environmentally friendly hard water resistant concrete release agent in the preparation of cement-based materials. Specifically, the release agent is mixed and diluted with hard water, sprayed onto the mold, and cement-based materials are formed after the film dries.

[0018] Preferably, the mass ratio of the release agent to hard water is 1:8-10.

[0019] This invention uses a variety of raw materials to emulsify and synthesize a release agent. After dilution with hard water, the emulsion is white and has a fine spray coating. The HLB value of the emulsion system is consistent with that of oil. The release agent is completely emulsified, with small emulsion particle size, which can be evenly dispersed on the surface of the mold. It has good release performance and can replace release agents such as waste engine oil and diesel. It solves a series of problems in concrete appearance, such as color and surface porosity, as well as problems in secondary construction and hard water environment. It can not only meet the requirements for concrete demolding, but also reduce environmental pollution. Detailed Implementation

[0020] To characterize the technical effect of this invention, a release agent was prepared and its performance was tested. A 1m×1m×1m concrete specimen was formed using a steel mold. The release agent was diluted with 25-degree hard water at a mass ratio of 1:9 and sprayed onto the inner surface of the mold. Concrete was then formed, and after 24 hours of standard curing, the specimen was demolded. During performance testing, the time it took for the white droplets to disappear and form an oil film after the diluted release agent was sprayed onto the steel mold was taken as the drying film time. After demolding, the number of air bubbles on the four sides of the concrete (excluding the top and bottom surfaces) was calculated as the number of air bubbles. The concrete adhering to the mold surface was cleaned and weighed, and the weight of the concrete adhering to one square meter was calculated as the amount of concrete adhering.

[0021] Example 1

[0022] The mold release agent is composed of the following raw materials in parts by weight: 83 parts of 50# white oil, 6 parts of modified triethanolamine, 3 parts of modified sodium petroleum sulfonate, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of sorbitan fatty acid ester, and 0.2 parts of liquid alkali.

[0023] The modified triethanolamine is prepared as follows: oleic acid is added to a container, the temperature is raised to 70°C, triethanolamine is added dropwise over 2 hours, and the temperature is maintained for 2 hours to obtain the product. The mass ratio of oleic acid to triethanolamine is 3:7.

[0024] The modified sodium petroleum sulfonate preparation process is as follows: add triple-distillate oil to a container, heat to 40°C, add furfural extract oil dropwise over 1 hour, the mass ratio of triple-distillate oil to furfural extract oil is 3.5:10, keep warm for 2 hours, dilute with water, add alkali solution to neutralize to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product.

[0025] Testing showed a dry film time of 25 minutes, 15 air bubbles, and a concrete adhesion of 2.1 g / m². 2 .

[0026] Example 2

[0027] The mold release agent is composed of the following raw materials in parts by weight: 85 parts of 50# white oil, 8 parts of modified triethanolamine, 2.5 parts of modified sodium petroleum sulfonate, 2 parts of alkylphenol polyoxyethylene ether, 6 parts of dehydrated sorbitan fatty acid ester, and 0.3 parts of liquid alkali.

[0028] The modified triethanolamine is prepared as follows: oleic acid is added to a container, the temperature is raised to 70°C, triethanolamine is added dropwise over 2 hours, and the temperature is maintained for 2 hours to obtain the product. The mass ratio of oleic acid to triethanolamine is 4:6.

[0029] The modified sodium petroleum sulfonate preparation process is as follows: add triple-distillate oil to a container, heat to 40°C, add furfural extract oil dropwise over 1 hour, the mass ratio of triple-distillate oil to furfural extract oil is 3:10, keep warm for 2 hours, dilute with water, add alkali solution to neutralize to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product.

[0030] Testing showed a dry film time of 24 minutes, 12 air bubbles, and a concrete adhesion of 1.9 g / m³. 2 .

[0031] Comparative Example 1

[0032] The mold release agent is composed of the following raw materials in parts by weight: 83 parts of 50# white oil, 6 parts of triethanolamine, 3 parts of modified sodium petroleum sulfonate, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of sorbitan fatty acid ester, and 0.2 parts of liquid alkali.

[0033] The modified sodium petroleum sulfonate preparation process is as follows: add triple-distillate oil to a container, heat to 40°C, add furfural extract oil dropwise over 1 hour, the mass ratio of triple-distillate oil to furfural extract oil is 3.5:10, keep warm for 2 hours, dilute with water, add alkali solution to neutralize to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product.

[0034] Testing showed a dry film time of 30 minutes, 23 air bubbles, and a concrete adhesion of 3.2 g / m³. 2 .

[0035] Comparative Example 2

[0036] The mold release agent is composed of the following raw materials in parts by weight: 87 parts of 50# white oil, 5 parts of modified sodium petroleum sulfonate, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of dehydrated sorbitan fatty acid ester, and 0.2 parts of liquid alkali.

[0037] The modified sodium petroleum sulfonate preparation process is as follows: add triple-distillate oil to a container, heat to 40°C, add furfural extract oil dropwise over 1 hour, the mass ratio of triple-distillate oil to furfural extract oil is 3.5:10, keep warm for 2 hours, dilute with water, add alkali solution to neutralize to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product.

[0038] Testing revealed a dry film time of 33 minutes, 37 air bubbles, and a concrete adhesion rate of 3.6 g / m². 2 .

[0039] Comparative Example 3

[0040] The mold release agent is composed of the following raw materials in parts by weight: 83 parts of 50# white oil, 6 parts of modified triethanolamine, 3 parts of T702 sodium petroleum sulfonate, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of sorbitan fatty acid ester, and 0.2 parts of liquid alkali.

[0041] The modified triethanolamine preparation process is as follows: oleic acid is added to a container, the temperature is raised to 70°C, triethanolamine is added dropwise over 2 hours, and the temperature is maintained for 2 hours to obtain the product. The mass ratio of oleic acid to triethanolamine is 3:7.

[0042] Testing revealed a dry film time of 31 minutes, 24 air bubbles, and a concrete adhesion of 4.0 g / m³. 2 .

[0043] Comparative Example 4

[0044] The mold release agent is composed of the following raw materials in parts by weight: 86 parts of 50# white oil, 6 parts of modified triethanolamine, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of dehydrated sorbitan fatty acid ester, and 0.2 parts of liquid alkali.

[0045] The modified triethanolamine preparation process is as follows: oleic acid is added to a container, the temperature is raised to 70°C, triethanolamine is added dropwise over 2 hours, and the temperature is maintained for 2 hours to obtain the product. The mass ratio of oleic acid to triethanolamine is 3:7.

[0046] Testing revealed a dry film time of 34 minutes, 55 air bubbles, and a concrete adhesion of 5.7 g / m². 2 .

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmentally friendly release agent for hard water-resistant concrete, characterized in that, It is composed of the following raw materials in parts by weight: 82-86 parts base oil, 6-8 parts modified triethanolamine, 2-3 parts modified sodium petroleum sulfonate, 2-4 parts alkylphenol polyoxyethylene ether, 4-6 parts sorbitan fatty acid ester, and 0.1-0.5 parts liquid alkali. The modified triethanolamine is prepared by adding oleic acid to a container, heating, adding triethanolamine dropwise, and maintaining the temperature. The modified sodium petroleum sulfonate is prepared as follows: Add reduced-density distillate oil to a container, heat, add furfural to extract the oil, maintain the temperature, dilute with water, neutralize with alkali solution to pH 8, add dichloropropane for extraction, take the intermediate solution, dry, and obtain the product. In the preparation process of modified triethanolamine, the mass ratio of oleic acid to triethanolamine is (3-4):(6-7); In the preparation process of modified sodium petroleum sulfonate, the mass ratio of reduced-density distillate oil to furfural extract oil is (3-4):

10.

2. The environmentally friendly hard water resistant concrete release agent according to claim 1, characterized in that, The base oil is 50# white oil.

3. The environmentally friendly hard water resistant concrete release agent according to claim 1, characterized in that, In the preparation process of modified triethanolamine, the temperature is raised to 70±10℃, the triethanolamine is added dropwise for 1-2 hours, and the holding time is 2-3 hours.

4. The environmentally friendly hard water resistant concrete release agent according to claim 1, characterized in that, In the preparation process of modified petroleum sulfonate, the temperature is raised to 40±10℃, the furfural extraction oil is added dropwise for 0.5-1h, and the temperature is maintained for 1-2h.

5. The preparation method of the environmentally friendly hard water resistant concrete release agent according to any one of claims 1-4, characterized in that, The process includes the following steps: adding base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester and liquid alkali to a stirred tank in sequence, and stirring until homogeneous to obtain the final product.

6. The preparation method of the environmentally friendly hard water resistant concrete release agent according to claim 5, characterized in that, The stirring speed is 2800-3200 r / min, and the stirring time is 20-30 min.

7. The application of the environmentally friendly hard water resistant concrete release agent according to any one of claims 1-4 in the preparation of cement-based materials, characterized in that, Mix and dilute the release agent with hard water, spray it onto the mold, and wait for the film to dry before molding the cement-based material.

8. The application according to claim 7, characterized in that, The mass ratio of mold release agent to hard water is 1:8-10.