Environment-friendly demoulding curing agent, synthetic method and application method

Abstract

The invention belongs to the technical field of concrete curing agents, and particularly relates to an environment-friendly demolding curing agent, a synthesis method and an application method. The environment-friendly demolding curing agent is prepared from the following components in parts by mass: 10 to 15 parts of a mixed wax system, 75 to 80 parts of distilled water, 45 to 50 parts of a bio-based emulsifier, 15 to 20 parts of modified hydroxyethyl cellulose, 0.2 to 0.5 part of a guar gum-Arabic gum compound system, 5 to 5.5 parts of L-arginine and 0.5 to 1.0 part of nano silicon dioxide, according to the environment-friendly demolding curing agent, a mixed wax system is adopted to improve the biodegradability, and meanwhile, the film forming lubricity is kept; by adopting the bio-based emulsifier, the potential influence on the environment is reduced, meanwhile, the HLB value is kept within the range of 9-12, and the emulsification stability is ensured; by adopting the modified hydroxyethyl cellulose with a natural source, the thickening efficiency is higher, the risk of hot and cold layering is reduced, and the toughness of the film is enhanced by cooperating with the nano silicon dioxide; by adopting a guar gum-Arabic gum compounded system, the cost of the raw materials is reduced, and the rheological property is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete curing agents, and particularly relates to an environment-friendly demoulding curing agent, a synthesis method and an application method thereof. Background Art

[0002] A demoulding agent is an external additive for concrete, which is applied to the surface of the formwork during the concrete production process to protect the concrete from the external environment before final setting, and plays a lubricating role during the formwork removal process to avoid damage to the concrete surface due to sticking to the formwork. A curing agent is an external additive for concrete used to improve the curing effect during the concrete curing process, ensure the early strength growth, or replace the curing measures in the construction area without curing conditions. The demoulding curing agent not only has the demoulding function but also has the curing function.

[0003] In the prior art, a Chinese invention patent application with the application publication number CN116286161A discloses a demoulding and curing integrated agent, a synthesis and application method. This demoulding and curing integrated agent is mainly composed of C14 liquid paraffin (99%), distilled water, span80, op-10, polyethylene glycol - 2000, xanthan gum and triethanolamine in corresponding proportions; among them, C14 liquid paraffin, span 80, and op-10 decompose slowly in the environment and may release harmful substances during the degradation process, having an adverse impact on the environment.

[0004] Therefore, it is necessary to design an environment-friendly demoulding curing agent, a synthesis method and an application method that improve biodegradability while ensuring strength performance to solve the current technical problems. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides an environment-friendly demoulding curing agent, a synthesis method and an application method that improve biodegradability while ensuring strength performance.

[0006] The technical solution of the present invention is as follows: The environment-friendly demoulding curing agent includes the following components in mass fractions:

[0007] 10 - 15 parts of a mixed wax system, 75 - 80 parts of distilled water, 45 - 50 parts of a bio-based emulsifier, 15 - 20 parts of modified hydroxyethyl cellulose, 0.2 - 0.5 parts of a guar gum - arabic gum compound system, 5 - 5.5 parts of L-arginine, and 0.5 - 1.0 parts of nano-silica.

[0008] Further, the mixed wax system includes the following components in mass fractions: 6 - 8 parts of 70% C14 liquid paraffin and 2 - 4 parts of hydrogenated soybean wax.

[0009] Further, the guar gum - arabic gum compound system includes the following components in mass fractions: 3 - 4 parts of guar gum and 1 - 2 parts of arabic gum.

[0010] Further, the bio-based emulsifier is sodium methyl ester sulfonate or sucrose ester.

[0011] Further, the environment-friendly demoulding and curing agent further comprises the following components in mass fractions: 0.1 - 0.3 parts of tea polyphenol microcapsules; 0.2 - 0.3 parts of sodium silicate microcapsules.

[0012] Further, the environment-friendly demoulding and curing agent comprises the following components in mass fractions: 12 parts of a mixed wax system, 76 parts of distilled water, 46 parts of a bio-based emulsifier, 17 parts of modified hydroxyethyl cellulose, 2 parts of a guar gum - arabic gum compound system, 5 parts of L-arginine, and 0.5 part of nano-silica.

[0013] A method for synthesizing an environment-friendly demoulding and curing agent comprises the following steps:

[0014] S1, adding the mixed wax system, distilled water and the bio-based emulsifier into a reaction kettle, setting the temperature at 50 - 55°C, the stirring speed at 1400 - 1500 r / min, and reacting for 60 - 70 min;

[0015] S2, continuously adding modified hydroxyethyl cellulose, the guar gum - arabic gum compound system, L-arginine and nano-silica into the reaction kettle, setting the temperature at 45 - 50°C, the stirring speed at 1000 - 1200 r / min, and reacting for 45 - 60 min to form a homogeneous and dispersed emulsion liquid in the reaction kettle;

[0016] S3, cooling the emulsion liquid in S2 to 40°C at a cooling rate of 1°C / min, and then cooling it to 30°C at a cooling rate of 0.5°C / min, and naturally cooling to room temperature.

[0017] Further, S2 includes:

[0018] S21, continuously adding modified hydroxyethyl cellulose, the guar gum - arabic gum compound system, L-arginine and nano-silica into the reaction kettle, setting the temperature at 50°C, the stirring speed at 12,00 r / min, and reacting for 25 min;

[0019] S22, continuously adding tea polyphenol microcapsules into the reaction kettle, setting the temperature at 44°C, the stirring speed at 1000 r / min, and reacting for 25 min.

[0020] A method for applying the environment-friendly demoulding and curing agent comprises the following steps:

[0021] S1, mixing the environment-friendly demoulding and curing agent with concrete curing water and stirring evenly to form a homogeneous and dispersed emulsion mixed liquid;

[0022] S2. Uniformly cover the surface of the concrete formwork with the milky mixed liquid through a high-pressure atomization spraying device, and adjust the dosage to 80 - 90 g / m 2 .

[0023] Further, in S1, the environment-friendly demoulding and curing agent is admixed with the concrete curing water, and sodium silicate microcapsules are added and stirred evenly.

[0024] Advantages of the present invention:

[0025] (1) The environment-friendly demoulding and curing agent in the present invention adopts a mixed wax system to improve biodegradability while maintaining film-forming lubricity; adopts a bio-based emulsifier to reduce the potential impact on the environment while maintaining the HLB value within the range of 9 - 12 to ensure emulsification stability; adopts a modified hydroxyethyl cellulose from natural sources with higher thickening efficiency, reducing the risk of cold and heat delamination, and synergistically enhancing film toughness with nano-silica; adopts a guar gum - arabic gum compound system to reduce raw material costs and have better rheological properties; L-arginine is environmentally friendly and non-toxic, promoting the hydration efficiency of cement and avoiding skin irritation to construction workers caused by traditional amines;

[0026] (2) The synthesis method of the environment-friendly demoulding and curing agent in the present invention uses a higher temperature and rotation speed in the emulsification stage S1 to accelerate dispersion, uses a lower temperature and rotation speed in the stabilization stage S2 to reduce shear damage, and in the cooling stage S3, adopts a gradient cooling method of first cooling at a rate of 1 °C / min to 40 °C, then cooling at a rate of 0.5 °C / min to 30 °C, and finally naturally cooling to room temperature, gradually cooling to avoid emulsion delamination caused by rapid cooling;

[0027] (3) The application method of the environment-friendly demoulding and curing agent in the present invention uses a spraying method to replace the smearing method to uniformly cover the surface of the concrete formwork, which can improve construction efficiency and reduce material waste. Description of the Drawings

[0028] Figure 1 It is a process flow chart of the synthesis method of the environment-friendly demoulding and curing agent in the present invention.

[0029] Figure 2 It is a process flow chart of the application method of the environment-friendly demoulding and curing agent in the present invention. Detailed Embodiments

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0031] The "first", "second", and similar terms used in the present invention do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements preceding the term cover the elements enumerated after the term, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0032] An environment-friendly demoulding curing agent is disclosed in this embodiment, which comprises the following components by mass fraction:

[0033] 10 - 15 parts of a mixed wax system, 75 - 80 parts of distilled water, 45 - 50 parts of a bio-based emulsifier, 15 - 20 parts of modified hydroxyethyl cellulose, 0.2 - 0.5 part of a guar gum - arabic gum compound system, 5 - 5.5 parts of L-arginine, and 0.5 - 1.0 part of nano-silica.

[0034] In the above embodiment, the mixed wax system is adopted to improve biodegradability while maintaining film-forming lubricity; the bio-based emulsifier is adopted to reduce the potential impact on the environment while maintaining the HLB value within the range of 9 - 12 to ensure emulsification stability; the modified hydroxyethyl cellulose from natural sources has higher thickening efficiency and reduces the risk of cold and heat delamination, and synergistically enhances film toughness with nano-silica; the guar gum - arabic gum compound system is adopted to reduce raw material costs and has better rheological properties; L-arginine is environmentally friendly and non-toxic, promotes the hydration efficiency of cement, and avoids skin irritation to construction workers caused by traditional amines.

[0035] As a specific embodiment of the mixed wax system, the mixed wax system comprises the following components by mass fraction: 6 - 8 parts of 70% C14 liquid paraffin and 2 - 4 parts of hydrogenated soy wax; specifically, the mixed wax system comprises the following components by mass fraction: 6 parts of 70% C14 liquid paraffin and 2 parts of hydrogenated soy wax; or the mixed wax system comprises the following components by mass fraction: 8 parts of 70% C14 liquid paraffin and 4 parts of hydrogenated soy wax; or the mixed wax system comprises the following components by mass fraction: 7 parts of 70% C14 liquid paraffin and 3 parts of hydrogenated soy wax; the preparation method of the mixed wax system is to take 70% C14 liquid paraffin and hydrogenated soy wax according to the mass fraction, and fully stir and mix evenly to obtain the mixed wax system; adding hydrogenated soy wax to 70% C14 liquid paraffin to make the mixed wax system can improve biodegradability and maintain film - forming lubricity at the same time, and the hydrogenated soy wax can enhance the temperature resistance of the emulsion film.

[0036] As a specific embodiment of the guar gum - gum arabic composite system, the guar gum - gum arabic composite system comprises the following components by mass fraction: 3 - 4 parts of guar gum and 1 - 2 parts of gum arabic; specifically, the guar gum - gum arabic composite system comprises the following components by mass fraction: 3 parts of guar gum and 1 part of gum arabic; or the guar gum - gum arabic composite system comprises the following components by mass fraction: 4 parts of guar gum and 2 parts of gum arabic; or the guar gum - gum arabic composite system comprises the following components by mass fraction: 3.5 parts of guar gum and 1.5 parts of gum arabic; the preparation method of the guar gum - gum arabic composite system is to take guar gum and gum arabic according to the mass fraction, and fully stir and mix evenly to obtain the guar gum - gum arabic composite system; compared with xanthan gum, the cost of the guar gum - gum arabic composite system is reduced by 30%, and the rheological properties are better, and the gum arabic can improve the anti - shear stability of the emulsion.

[0037] In some embodiments, the bio - based emulsifier is sodium methyl ester sulfonate or sucrose ester, which reduces the potential impact on the environment and maintains the HLB value in the range of 9 - 12 to ensure emulsion stability.

[0038] In some embodiments, the environment - friendly demoulding and curing agent further comprises the following components by mass fraction: 0.1 - 0.3 parts of tea polyphenol microcapsules; 0.2 - 0.3 parts of sodium silicate microcapsules; specifically, the environment - friendly demoulding and curing agent further comprises the following components by mass fraction: 0.1 part of tea polyphenol microcapsules; 0.2 part of sodium silicate microcapsules; or the environment - friendly demoulding and curing agent further comprises the following components by mass fraction: 0.3 part of tea polyphenol microcapsules; 0.3 part of sodium silicate microcapsules; or the environment - friendly demoulding and curing agent further comprises the following components by mass fraction: 0.2 part of tea polyphenol microcapsules; 0.25 part of sodium silicate microcapsules; tea polyphenol is a natural antibacterial agent, which inhibits the growth of mildew on the concrete surface, and the microcapsule sustained - release design provides long - term protection; the sodium silicate microcapsules slowly release active ingredients during the concrete curing stage, extending the concrete curing period.

[0039] In some embodiments, the environment-friendly demoulding and curing agent comprises the following components by mass fraction:

[0040] 12 parts of mixed wax system, 76 parts of distilled water, 46 parts of bio-based emulsifier, 17 parts of modified hydroxyethyl cellulose, 2 parts of guar gum - arabic gum compound system, 5 parts of L-arginine, 0.5 part of nano-silica.

[0041] In some embodiments, the environment-friendly demoulding and curing agent comprises the following components by mass fraction:

[0042] 10 parts of mixed wax system, 75 parts of distilled water, 45 parts of bio-based emulsifier, 15 parts of modified hydroxyethyl cellulose, 0.2 part of guar gum - arabic gum compound system, 5 parts of L-arginine, 0.5 part of nano-silica.

[0043] In some embodiments, the environment-friendly demoulding and curing agent comprises the following components by mass fraction:

[0044] 15 parts of mixed wax system, 80 parts of distilled water, 50 parts of bio-based emulsifier, 20 parts of modified hydroxyethyl cellulose, 0.5 part of guar gum - arabic gum compound system, 5.5 parts of L-arginine, 1.0 part of nano-silica.

[0045] In some embodiments, as Figure 1 shown, a synthesis method of an environment-friendly demoulding and curing agent is disclosed, comprising the following steps:

[0046] S1. Add the mixed wax system, distilled water and bio-based emulsifier into a reaction kettle, set the temperature to 50 - 55 °C, the stirring speed to 1400 - 1500 r / min, and react for 60 - 70 min;

[0047] S2. Continuously add modified hydroxyethyl cellulose, guar gum - arabic gum compound system, L-arginine and nano-silica into the reaction kettle, set the temperature to 45 - 50 °C, the stirring speed to 1000 - 1200 r / min, and react for 45 - 60 min to form a homogeneous and dispersed emulsion liquid in the reaction kettle;

[0048] S3. Cool the emulsion liquid in S2 to 40 °C at a cooling rate of 1 °C / min, then reduce the temperature to 30 °C at a cooling rate of 0.5 °C / min, and naturally cool to room temperature.

[0049] In the above embodiments, in the emulsification stage S1 of the synthesis method of the environment-friendly demoulding curing agent, a relatively high temperature and rotation speed are adopted to accelerate dispersion. In the stabilization stage S2, a relatively low temperature and rotation speed are adopted to reduce shear damage. In the cooling stage S3, a gradient cooling method is adopted, where the temperature is first decreased to 40 °C at a rate of 1 °C / min, then decreased to 30 °C at a rate of 0.5 °C / min, and finally naturally cooled to room temperature, gradually cooling down to avoid emulsion stratification caused by rapid cooling.

[0050] Further, in the above embodiments, S2 includes:

[0051] S21, continue to add modified hydroxyethyl cellulose, guar gum - arabic gum compound system, L-arginine, and nano-silica into the reaction kettle, set the temperature to 50 °C, the stirring speed to 1200 r / min, and react for 25 min;

[0052] S22, continue to add tea polyphenol microcapsules into the reaction kettle, set the temperature to 44 °C, the stirring speed to 1000 r / min, and react for 25 min.

[0053] Among them, S21 is the stabilization stage, adopting a moderate temperature and rotation speed to reduce shear damage. S22 adopts a relatively low temperature and rotation speed, which can ensure the integrity of the active ingredients.

[0054] In some embodiments, as Figure 2 shown, an application method of an environment-friendly demoulding curing agent is disclosed, which is characterized by including the following steps:

[0055] S1, mix the environment-friendly demoulding curing agent with concrete curing water, and stir evenly to form a homogeneous and dispersed milky mixed liquid;

[0056] S2, evenly cover the surface of the concrete formwork with the milky mixed liquid through a high-pressure atomization spraying device, and adjust the dosage to 80 - 90 g / m 2 .

[0057] In the above embodiments, the application method of the environment-friendly demoulding curing agent uses the spraying method to replace the smearing method to evenly cover the surface of the concrete formwork, which can improve the construction efficiency and reduce material waste.

[0058] Further, in S1, mix the environment-friendly demoulding curing agent with concrete curing water, and add sodium silicate microcapsules and stir evenly; adding sodium silicate microcapsules into the emulsion can slowly release active ingredients during the concrete curing stage and extend its curing cycle.

[0059] So far, the embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0060] The above-described embodiments merely represent some implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An environmentally friendly demoulding and curing agent, characterized in that, Comprising components with the following mass fractions: Mixed wax system 10 - 15 parts, distilled water 75 - 80 parts, bio-based emulsifier 45 - 50 parts, modified hydroxyethyl cellulose 15 - 20 parts, guar gum - arabic gum compound system 0.2 - 0.5 parts, L-arginine 5 - 5.5 parts, nano-silica 0.5 - 1.0 part.

2. The environmentally friendly demoulding and curing agent according to claim 1, characterized in that: The said mixed wax system comprises components with the following mass fractions: 70% C14 liquid paraffin 6 - 8 parts, hydrogenated soybean wax 2 - 4 parts.

3. The environmentally friendly demoulding and curing agent according to claim 1, characterized in that: The said guar gum - arabic gum compound system comprises components with the following mass fractions: Guar gum 3 - 4 parts, arabic gum 1 - 2 parts.

4. The environmentally friendly demoulding and curing agent according to claim 1, characterized in that: The said bio-based emulsifier is sodium fatty acid methyl ester sulfonate or sucrose ester.

5. The environmentally friendly demoulding and curing agent according to claim 1, characterized in that: It further comprises components with the following mass fractions: Tea polyphenol microcapsules 0.1 - 0.3 part; sodium silicate microcapsules 0.2 - 0.3 part.

6. The environmentally friendly demoulding and curing agent according to claim 1, characterized in that, Comprising components with the following mass fractions: Mixed wax system 12 parts, distilled water 76 parts, bio-based emulsifier 46 parts, modified hydroxyethyl cellulose 17 parts, guar gum - arabic gum compound system 0.2 part, L-arginine 5 parts, nano-silica 0.5 part.

7. A synthetic method of an environment-friendly demoulding and curing agent, characterized in that, Comprising the following steps: S1, Add the mixed wax system, distilled water and bio-based emulsifier into the reaction kettle, set the temperature at 50 - 55 °C, the stirring speed at 1400 - 1500 r / min, and react for 60 - 70 min; S2, Continuously add modified hydroxyethyl cellulose, guar gum - arabic gum compound system, L-arginine, nano-silica into the reaction kettle, set the temperature at 45 - 50 °C, the stirring speed at 1000 - 1200 r / min, and react for 45 - 60 min, and a homogeneous and dispersed emulsion liquid is formed in the reaction kettle; S3, Cool the emulsion liquid in S2 to 40 °C at a cooling rate of 1 °C / min, and then cool it to 30 °C at a cooling rate of 0.5 °C / min, and then naturally cool to room temperature.

8. The synthesis method of the environment-friendly demoulding curing agent according to claim 7, wherein, The said S2 includes: S21, Continuously add modified hydroxyethyl cellulose, guar gum - arabic gum compound system, L-arginine, nano-silica into the reaction kettle, set the temperature at 50 °C, the stirring speed at 1200 r / min, and react for 25 min; S22, Continuously add tea polyphenol microcapsules into the reaction kettle, set the temperature at 44 °C, the stirring speed at 1000 r / min, and react for 25 min.

9. A method for applying an environmentally friendly demoulding and curing agent, characterized in that, Comprising the following steps: S1, Mix the environmentally friendly demoulding and curing agent with the concrete curing water, and stir evenly to form a homogeneous and dispersed emulsion mixed liquid; S2. Uniformly cover the surface of the concrete formwork with the emulsified mixed liquid through a high-pressure atomizing spraying device, and adjust the dosage to 80 - 90 g / m 2 .

10. The application method of the environment-friendly demoulding and curing agent according to claim 9, characterized in that, In the said S1, mix the environmentally friendly demoulding and curing agent with the concrete curing water, and add sodium silicate microcapsules and stir evenly.

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