Environment-friendly hard-water-resistant concrete release agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cement-based building material admixtures, in particular to an environment-friendly hard-water-resistant concrete release agent and a preparation method and application thereof.The environment-friendly hard-water-resistant concrete release agent is formed by mixing base oil, modified triethanolamine, modified petroleum sodium sulfonate, alkylphenol ethoxylates, sorbitan fatty acid ester and caustic soda liquid as raw materials; the mold release agent has good mold release performance, the surface of concrete has no harmful holes and no color difference after a template is removed, the template is easy to clean, the mold release agent also has good emulsifying performance in a hard water environment, and the mold release agent is non-toxic and harmless to the surrounding environment.

Description

Technical Field

[0001] The invention relates to the technical field of cement-based building material admixtures, and in particular to an environmentally friendly hard water resistant concrete release agent, a preparation method and application thereof. Background Art

[0002] In order to make the building have a smooth and beautiful surface, release agents are often brushed or sprayed on the formwork during the concrete pouring process. The release agent has also undergone several technological iterations. Emulsion release agents have been used since the 1980s and 1990s. In 1992, my country authorized the first patent for the invention of concrete release agent. It has good demoulding effect, simple process and low cost, and is currently widely used.

[0003] Emulsion release agents are divided into lubricating oil emulsions, paraffin emulsions, silicone emulsions, etc. However, in the existing construction process, the production of concrete products mostly uses waste oil, paraffin, and even some recycled gutter oil as release agents. The quality of release agents prepared from these raw materials is unstable, affecting the structural strength of concrete, building quality and personnel safety. In addition, due to the limitation of raw materials in the construction site, hard water is often used as a dilution solution during the use of release agents. The large amount of calcium and magnesium ions in hard water will cause the release agent to fail to emulsify, which will ultimately affect the appearance of the concrete structure. In addition, the use of release agents such as waste oil can easily lead to poor color of concrete appearance, many pores, and secondary construction is prone to peeling, hollowing, and falling off. The residual release agent will also pollute the environment. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides an environmentally friendly hard water resistant concrete release agent, which 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. The release agent not only has good demoulding performance, but also has no harmful holes and color difference on the concrete surface after the template is removed, and the template is easy to clean. It also has good emulsification performance in a hard water environment and is non-toxic and harmless to the surrounding environment.

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

[0006] Preferably, the modified triethanolamine preparation process is: add oleic acid into a container, increase the temperature, dropwise add triethanolamine, and keep the temperature to obtain the modified triethanolamine.

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

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

[0009] Modified triethanolamine has better emulsifying properties, can be emulsified more effectively, and has a short-term anti-rust effect, which can protect the surface of metal molds from erosion.

[0010] Preferably, the preparation process of the modified sodium petroleum sulfonate is as follows: add the three-line distillate oil into a container, heat it, dropwise add furfural to extract the oil, keep it warm, dilute it with water, then add alkali solution to neutralize it to a pH value of 8, add dichloropropane to extract it, take the intermediate solution, and dry it to obtain the product.

[0011] More preferably, in the process for preparing modified sodium petroleum sulfonate, the mass ratio of the third-line distillate oil to the furfural extracted oil is (3-4):10.

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

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

[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, which specifically comprises the following steps: adding base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester and liquid alkali into a stirring kettle in sequence, and stirring evenly to obtain the release agent.

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

[0017] The present invention also relates to the use 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 a mold, and the cement-based material is formed after the dry film is formed.

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

[0019] The present invention adopts multiple raw materials to emulsify and synthesize the release agent. After being diluted with hard water, the emulsion is white and smooth when sprayed. The HLB value of the emulsified system is consistent with the HLB of the oil. The release agent is completely emulsified and has a small emulsified particle size. It can be evenly dispersed on the surface of the test mold and has good demoulding performance. The release agent can replace waste engine oil, diesel and other release agents, solve a series of problems existing in the appearance color of concrete, many pores on the surface, secondary construction and hard water environment, and can not only meet the concrete demoulding requirements, but also reduce pollution to the environment. DETAILED DESCRIPTION

[0020] In order to characterize the technical effect of the present invention, a release agent was prepared and its performance was tested. A steel mold was used to form a concrete specimen of 1m×1m×1m. The release agent was diluted with 25-degree hard water in a mass ratio of 1:9 and then sprayed onto the inner surface of the mold to form concrete. The concrete was demolded after 24 hours of standard curing. During the performance test, the time it took for white droplets to disappear and form an oil film after the steel mold was sprayed with the diluted release agent was observed as the dry film time. After demolding, the number of bubbles on the four surfaces of the concrete except the top and bottom surfaces was calculated as the number of bubbles. The concrete adhered to the mold surface was cleaned and weighed, and the weight adhered per square meter was calculated as the concrete adhesion amount.

[0021] Example 1

[0022] The 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, 0.2 parts of liquid alkali,

[0023] The modified triethanolamine preparation process is as follows: add oleic acid into a container, heat to 70° C., dropwise add triethanolamine for 2 h, and keep warm for 2 h to obtain a modified triethanolamine, wherein the mass ratio of oleic acid to triethanolamine is 3:7.

[0024] The preparation process of the modified sodium petroleum sulfonate is as follows: add the three-line distillate oil into a container, heat it to 40°C, dropwise add furfural extracted oil for 1 hour, the mass ratio of the three-line distillate oil to the furfural extracted 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, and dry it to obtain the modified sodium petroleum sulfonate.

[0025] After testing, the dry film time is 25min, the number of bubbles is 15, and the concrete adhesion is 2.1g / m 2 .

[0026] Example 2

[0027] The 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 sorbitan fatty acid ester, 0.3 parts of liquid alkali,

[0028] The modified triethanolamine preparation process is as follows: add oleic acid into a container, heat it to 70° C., dropwise add triethanolamine for 2 hours, and keep the temperature for 2 hours to obtain the modified triethanolamine, wherein the mass ratio of oleic acid to triethanolamine is 4:6.

[0029] The preparation process of the modified sodium petroleum sulfonate is as follows: add the three-line distillate oil into a container, heat it to 40°C, dropwise add furfural extracted oil for 1 hour, the mass ratio of the three-line distillate oil to the furfural extracted 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, and dry it to obtain the modified sodium petroleum sulfonate.

[0030] After testing, the dry film time is 24 minutes, the number of bubbles is 12, and the concrete adhesion is 1.9g / m 2 .

[0031] Comparative Example 1

[0032] The 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, 0.2 parts of liquid alkali,

[0033] The preparation process of the modified sodium petroleum sulfonate is as follows: add the three-line distillate oil into a container, heat it to 40°C, dropwise add furfural extracted oil for 1 hour, the mass ratio of the three-line distillate oil to the furfural extracted 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, and dry it to obtain the modified sodium petroleum sulfonate.

[0034] After testing, the dry film time is 30min, the number of bubbles is 23, and the concrete adhesion is 3.2g / m 2 .

[0035] Comparative Example 2

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

[0037] The preparation process of the modified sodium petroleum sulfonate is as follows: add the three-line distillate oil into a container, heat it to 40°C, dropwise add furfural extracted oil for 1 hour, the mass ratio of the three-line distillate oil to the furfural extracted 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, and dry it to obtain the modified sodium petroleum sulfonate.

[0038] After testing, the dry film time was 33 minutes, the number of bubbles was 37, and the concrete adhesion was 3.6g / m 2 .

[0039] Comparative Example 3

[0040] The 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 petroleum sodium sulfonate, 3 parts of alkylphenol polyoxyethylene ether, 5 parts of sorbitan fatty acid ester, 0.2 parts of liquid alkali,

[0041] The modified triethanolamine preparation process is as follows: add oleic acid into a container, heat it to 70° C., dropwise add triethanolamine for 2 hours, and keep the temperature for 2 hours to obtain the modified triethanolamine, wherein the mass ratio of oleic acid to triethanolamine is 3:7.

[0042] After testing, the dry film time is 31min, the number of bubbles is 24, and the concrete adhesion is 4.0g / m 2 .

[0043] Comparative Example 4

[0044] The 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 sorbitan fatty acid ester, 0.2 parts of liquid alkali,

[0045] The modified triethanolamine preparation process is as follows: add oleic acid into a container, heat it to 70° C., dropwise add triethanolamine for 2 hours, and keep the temperature for 2 hours to obtain the modified triethanolamine, wherein the mass ratio of oleic acid to triethanolamine is 3:7.

[0046] After testing, the dry film time was 34 minutes, the number of bubbles was 55, and the concrete adhesion was 5.7g / m 2 .

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 hard water resistant concrete release agent, characterized in that: The invention is composed of the following raw materials in parts by weight: 82-86 parts of base oil, 6-8 parts of modified triethanolamine, 2-3 parts of modified sodium petroleum sulfonate, 2-4 parts of alkylphenol polyoxyethylene ether, 4-6 parts of sorbitan fatty acid ester, 0.1-0.5 parts of liquid alkali, The modified triethanolamine preparation process is as follows: add oleic acid into a container, increase the temperature, dropwise add triethanolamine, and keep the temperature, to obtain: The preparation process of the modified sodium petroleum sulfonate is as follows: adding the three-line distillate oil into a container, heating, dripping furfural to extract the oil, keeping the temperature, adding water to dilute, adding alkali solution to neutralize to a pH value of 8, adding dichloropropane to extract, taking the intermediate solution, and drying to obtain the modified sodium petroleum sulfonate.

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 mass ratio of oleic acid to triethanolamine is (3-4):(6-7).

4. 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°C, the triethanolamine is added dropwise for 1-2 hours, and the heat preservation time is 2-3 hours.

5. The environmentally friendly hard water resistant concrete release agent according to claim 1, characterized in that: In the preparation process of modified sodium petroleum sulfonate, the mass ratio of the third-line distillate oil to the furfural extracted oil is (3-4):

10.

6. The environmentally friendly hard water resistant concrete release agent according to claim 1, characterized in that: In the preparation process of modified sodium petroleum sulfonate, the temperature is raised to 40±10°C, the furfural extracted oil is added for 0.5-1h, and the temperature is kept for 1-2h.

7. The method for preparing the environment-friendly hard water resistant concrete release agent according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: adding base oil, modified triethanolamine, modified sodium petroleum sulfonate, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester and liquid alkali into a stirring kettle in sequence, and stirring evenly to obtain the product.

8. The method for preparing the environmentally friendly hard water resistant concrete release agent according to claim 7, characterized in that: The stirring speed is 2800-3200r / min, and the stirring time is 20-30min.

9. Use of the environmentally friendly hard water resistant concrete release agent according to any one of claims 1 to 6 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 dry film to form the cement-based material.

10. The use according to claim 9, characterized in that: The mixing mass ratio of the release agent to hard water is 1:8-10.