A concrete retarder, its preparation method and application

Abstract

The present invention relates to a concrete retarder, its preparation method and application. The retarder comprises the following components in parts by weight: 44 - 59 parts of a composite retarder, 2 - 4.5 parts of a densifier, 17 - 22 parts of a pigment and 21 - 32 parts of a solvent. The composite retarder comprises 2 - 4 parts of tartaric acid, 33 - 43 parts of borax and 9 - 12 parts of citric acid; the densifier comprises 2 - 4.5 parts of silicon dioxide; the pigment comprises 17 - 22 parts of titanium dioxide; the solvent comprises 20 - 28 parts of petroleum hydrotreated light naphtha and 1 - 4 parts of petroleum spirit. In the present invention, petroleum hydrotreated light naphtha and petroleum spirit are used as solvents to promote the dissolution between various components, enhance the stability and uniformity of the retarder, and the setting time can be regulated by changing its dosage, promote the setting of the retarder, and adjust the viscosity of the retarder; the concrete retarder has a small dosage and a fast drying speed, and the flushing effect is uniform, and 13 different flushing depths can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building engineering materials, and particularly relates to a concrete retarder, a preparation method thereof, and an application thereof. Background Art

[0002] With the development of China's national economy, people's growing needs for a better life have led to an increasing demand for the aesthetics of modern buildings. Many building surfaces require carved patterns and painted beautiful images, which enriches people's daily lives and is generally achieved using decorative stones. As a bulk and widely used building material, concrete plays a huge role in modern construction projects. Usually, concrete is composed of granular coarse aggregates, fine aggregates, and cement hydrates. During the pouring and construction process, due to difficulties in construction and high brittleness of concrete, it is very difficult to carve delicate patterns on the concrete surface. Therefore, concrete is difficult to meet the requirements of the aesthetic function of modern building surfaces. In recent years, some exposed-aggregate concrete retarders have emerged on the market. By spraying a retarder on the concrete surface, the setting of the concrete structure surface is delayed, and a unique exposed-aggregate effect of the concrete finish is formed after treatment, improving the surface aesthetics of the concrete.

[0003] After searching the existing technology, it is found that Chinese Patent CN110510913A records a preparation method of a concrete surface exposed-aggregate agent for precast components. First, a polymer / layered silicate composite colloid solution mainly composed of silicate clay is prepared, and an organic-inorganic composite retarder composition is added to the above polymer / layered silicate composite colloid solution. Under the action of high-speed dispersion, a functional auxiliary agent, a pigment, a filler, and a slow-release long-acting preservative are sequentially added to the above organic-inorganic composite retarder solution, and mixed and dispersed evenly to form a concrete surface exposed-aggregate agent. However, this patent adds a large amount of insoluble components such as clay and industrial by-product gypsum, and the finished product is prone to precipitation and stratification, which brings great inconvenience to use.

[0004] Chinese Patent CN103922796A records an environmentally friendly and low-cost concrete exposed-aggregate agent and a construction process. The components and weight parts of the concrete exposed-aggregate agent are as follows: water, 100 parts; monosaccharide, 7 - 15 parts; polysaccharide, 5 - 20 parts, where the monosaccharide is preferably glucose or fructose, and the polysaccharide is preferably white granulated sugar or brown sugar. Compared with similar products, the cost of this invention patent is reduced by 90% when achieving the same use effect, greatly saving the project cost. However, this invention patent contains a large amount of sugar substances, and it is very likely that the sugar substances will deteriorate and ferment, resulting in the decomposition of the exposed-aggregate agent, affecting the use and generating peculiar smells. In addition, when this patent is applied to outdoor scenes, it may be affected by other environmental factors, such as temperature, humidity, insect and dust pollution, etc., which may accelerate the deterioration process of sugar. Summary of the Invention

[0005] In order to overcome the above problems existing in the prior art, the object of the present invention is to provide a concrete retarder and its preparation method and application.

[0006] The specific technical solutions provided by the present invention are as follows:

[0007] A concrete retarder, comprising the following components in parts by weight: 44 - 59 parts of a composite retarder, 2 - 4.5 parts of a densifier, 17 - 22 parts of a pigment, and 21 - 32 parts of a solvent.

[0008] Preferably, the composite retarder includes tartaric acid, borax, and citric acid.

[0009] Preferably, the weight ratio of tartaric acid, borax, and citric acid is (2 - 4):(33 - 43):(9 - 12).

[0010] Preferably, the densifier includes one or both of silicon dioxide and aluminum oxide.

[0011] Preferably, the pigment includes one or more of iron oxide red, iron oxide yellow, iron oxide brown, iron oxide black, chromium oxide green, and titanium dioxide.

[0012] In the present invention, the selection of the pigment can be determined according to the exposed aggregate effect of the concrete finish, not limited to the several types listed above.

[0013] Preferably, the solvent includes hydrotreated light naphtha and petroleum spirit.

[0014] Preferably, the weight ratio of hydrotreated light naphtha and petroleum spirit is (20 - 28):(1 - 4).

[0015] Hydrotreated light naphtha, as a diluent, can effectively reduce the viscosity of the retarder, making the retarder easier to apply and evenly distribute during construction, which is crucial for improving the construction efficiency of the retarder and the quality of the coating film; hydrotreated light naphtha can help the retarder to quickly set after construction, which can not only shorten the setting time of the retarder, improve the construction efficiency, but also avoid quality problems such as peeling and blistering on the surface of the retarder; hydrotreated light naphtha can be used as a co - solvent to help the components in the retarder mix better, thereby enhancing the stability and uniformity of the retarder, and can improve the durability and use effect of the retarder.

[0016] Petroleum spirit is a colorless and transparent liquid with good solubility, capable of dissolving and diluting organic substances. As a solvent, it helps dissolve and disperse solid particles such as silica, tartaric acid, titanium dioxide, borax, and citric acid, forming a uniform retarder system. This makes the retarder easier to apply and distribute during construction, improving the construction efficiency of the retarder. Petroleum spirit has a low boiling point and volatility, which enables the retarder to set quickly after construction. The volatile property contributes to the rapid curing of the coating surface, shortening the setting time of the retarder and increasing production efficiency. Petroleum spirit can penetrate into the tiny pores of the wall surface, enhancing the wettability and adhesion of the retarder to the wall. This effect helps improve the durability and service effect of the coating film, enabling the retarder to better protect the wall from the erosion of the external environment. By adjusting the amount of petroleum spirit used, the viscosity of the retarder can be precisely controlled. This property allows the retarder to adapt to different construction environments and requirements. For example, in cases where a higher viscosity is needed to form a thick coating, the amount of petroleum spirit used can be reduced to achieve this; while in cases where a lower viscosity is required for easy application, the amount of petroleum spirit used can be increased to achieve the goal.

[0017] The present invention also provides a preparation method of a concrete retarder, comprising the following steps:

[0018] S1. Prepare materials according to the following component parts by weight: hydrogenated light naphtha: 20 - 28 parts, silica: 2 - 4.5 parts, tartaric acid: 2 - 4 parts, titanium dioxide: 17 - 22 parts, borax: 33 - 43 parts, citric acid: 9 - 12 parts, petroleum spirit: 1 - 4 parts;

[0019] S2. Weigh two-thirds of the weight parts of hydrogenated light naphtha and place it in a reactor. During stirring, add tartaric acid and citric acid. After mixing evenly, add petroleum spirit and mix thoroughly to obtain mixture A;

[0020] S3. Weigh the remaining one-third of the weight parts of hydrogenated light naphtha and place it in a reactor. During stirring, add silica, titanium dioxide, and borax. After mixing evenly, add mixture A obtained in step S2, mix thoroughly, and then let it stand for 1 h and seal to obtain the concrete retarder.

[0021] The present invention also provides an application of a concrete retarder, comprising the following steps:

[0022] S11. Stir the concrete retarder and apply it to the surface of the mold;

[0023] S12. After the concrete retarder dries, pour concrete into the mold to obtain a concrete member;

[0024] S13. Rinse the concrete member after 15 - 72 h.

[0025] Preferably, in step S12, the concrete is cured in the mold for more than 8 hours before demolding.

[0026] The concrete retarder of the present invention realizes the surface retardation function for early concrete; after the concrete component solidifies for 18 to 72 hours, the concrete in the part where the retarder is not applied coagulates. At this time, the concrete component is rinsed to wash away the retarder and the uncoagulated concrete, forming the required pattern on the concrete surface and having anti-slip performance.

[0027] A concrete retarder of the present invention, its preparation method and application have the following advantages:

[0028] 1. Petroleum hydrotreated light naphtha and petroleum spirit are used as solvents, which can promote the dissolution between various components, enhance the stability and uniformity of the retarder; changing the dosage of petroleum hydrotreated light naphtha and petroleum spirit can regulate the setting time of the retarder, promote the setting of the retarder. At the same time, petroleum hydrotreated light naphtha and petroleum spirit have good volatility and can adjust the viscosity of the retarder.

[0029] 2. The concrete retarder of the present invention can be sprayed, with a small dosage and a fast drying speed, and can form the required pattern on the concrete surface. During the subsequent rinsing process, the rinsing effect is uniform, 13 different rinsing depths can be achieved, the cleaning time period has a long span, and the cleaning cost is low. Detailed Embodiments

[0030] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following describes in detail the specific embodiments, structures, features and their effects according to the present invention in conjunction with preferred embodiments.

[0031] Example 1

[0032] This example provides a concrete retarder, which includes a composite retarder, a densifier, a pigment and a solvent.

[0033] Among them, the composite retarder includes 4 parts of tartaric acid, 40 parts of borax and 12 parts of citric acid; the densifier includes 4.5 parts of silicon dioxide; the pigment includes 18 parts of titanium dioxide; the solvent includes 20 parts of petroleum hydrotreated light naphtha and 1.5 parts of petroleum spirit.

[0034] The preparation method of this concrete retarder includes the following steps:

[0035] S1. Prepare materials according to the components of the above weight parts: among them, 20 kg of petroleum hydrotreated light naphtha, 4.5 kg of silicon dioxide, 4 kg of tartaric acid, 18 kg of titanium dioxide, 40 kg of borax, 12 kg of citric acid, and 1.5 kg of petroleum spirit.

[0036] S2. Weigh 13.33 kg of hydrotreated light naphtha and place it in a reactor. Stir, and slowly add 4 kg of soluble tartaric acid powder and 12 kg of citric acid powder. Stir for 10 minutes, then slowly add 1.5 kg of petroleum spirit, and continue to stir for 10 minutes to form mixture A.

[0037] S3. Weigh 6.67 kg of hydrotreated light naphtha and place it in a reactor. After stirring, slowly add 4.5 kg of powdered silica, 18 kg of titanium dioxide, and 40 kg of borax. Pour the powder while stirring at a low speed. After the powder is completely poured into the reactor, stir at a high speed for 15 minutes until the powder is completely dissolved. Then slowly add mixture A and stir for 10 minutes, and then let it stand for 1 hour for sealing to obtain a concrete retarder.

[0038] This embodiment also provides an application of the concrete retarder. Stir the above-prepared concrete retarder and spray it on the mold of a certain cast-in-place building facade decorative concrete. After the retarder dries for 60 minutes, perform concrete pouring. The concrete cures in the mold for 8 h, and then the concrete is demolded to obtain the building facade decorative concrete. After 15 hours, dry-brush the building facade decorative concrete, and then perform cleaning. After 28 days, observe the building facade decorative concrete. Compared with the concrete of the same facade, the depth of the surface slurry layer of the building facade decorative concrete treated in this embodiment reaches 0.1 mm, the concrete facade presents a delicate sandstone effect, showing the texture of the aggregate inside the concrete, and is full of beauty.

[0039] Example 2

[0040] This embodiment provides a concrete retarder, which comprises the following components in parts by weight: 28 parts of hydrotreated light naphtha, 3 parts of silica, 3 parts of tartaric acid, 22 parts of titanium dioxide, 33 parts of borax, 10 parts of citric acid, and 1 part of petroleum spirit.

[0041] The preparation method of the concrete retarder comprises the following steps:

[0042] S1. Prepare materials according to the above components in parts by weight: among them, 28 kg of hydrotreated light naphtha, 3 kg of silica, 3 kg of tartaric acid, 22 kg of titanium dioxide, 33 kg of borax, 10 kg of citric acid, and 1 kg of petroleum spirit.

[0043] S2. Weigh 18.67 kg of hydrotreated light naphtha and place it in a reactor. Stir, slowly add 3 kg of soluble tartaric acid powder and 10 kg of citric acid powder, stir for 10 minutes, slowly add 1 kg of petroleum spirit, and continue to stir for 10 minutes to form mixture A.

[0044] Step 2: Weigh 9.33 kg of petroleum hydrotreated light naphtha and place it in a reactor. After stirring, slowly add 3 kg of powdered silica, 22 kg of titanium dioxide, and 33 kg of borax. Pour the powder while stirring at a low speed. After the powder is completely poured into the reactor, stir at a high speed for 15 minutes until the powder is completely dissolved. Then slowly add mixture A and stir for 10 minutes. Then let it stand for 1 hour and seal it to obtain a concrete retarder.

[0045] This embodiment also provides an application of the concrete retarder. Stir the prepared concrete retarder and spray it on the mold of a certain precast concrete slab with a spraying thickness of 0.3 mm. Wait for the retarder to dry for 20 minutes and then carry out concrete pouring. The composition of this concrete is set according to the composition of general concrete slabs. For example, this concrete includes 75 parts of ordinary Portland cement, 200 parts of coarse aggregate stones, 150 parts of fine aggregate sand, 30 parts of admixture fly ash, 5 parts of water reducing agent, and 40 parts of water by mass fraction. The concrete is cured in the mold for 10 h, and then the concrete is demolded to obtain a concrete slab. After 18 hours, it is washed with a high-pressure water gun. After curing for 28 days, compared with the same precast concrete slab, the depth of the slurry layer on the surface of the precast concrete slab treated in this embodiment reaches 2 mm, showing the texture of the aggregates inside the concrete.

[0046] Example 3

[0047] This embodiment provides a concrete retarder, which comprises the following components in parts by weight: 25 parts of petroleum hydrotreated light naphtha, 2.5 parts of silica, 3 parts of tartaric acid, 20 parts of titanium dioxide, 37 parts of borax, 10 parts of citric acid, and 2.5 parts of petroleum spirit.

[0048] The preparation method of the concrete retarder comprises the following steps:

[0049] S1. Prepare materials according to the components in the above parts by weight: among them, 25 kg of petroleum hydrotreated light naphtha, 2.5 kg of silica, 3 kg of tartaric acid, 20 kg of titanium dioxide, 37 kg of borax, 10 kg of citric acid, and 2.5 kg of petroleum spirit.

[0050] S2. Weigh 16.67 kg of petroleum hydrotreated light naphtha and place it in a reactor. Stir, slowly add 3 kg of soluble tartaric acid powder and 10 kg of citric acid powder, stir for 10 minutes, slowly add 2.5 kg of petroleum spirit, and continue to stir for 10 minutes to form mixture A.

[0051] Step 2: Weigh 8.33 kg of petroleum hydrotreated light naphtha and place it in a reactor. After stirring, slowly add 2.5 kg of powdered silica, 20 kg of titanium dioxide, and 37 kg of borax. Pour the powder while stirring at a low speed. After the powder is completely poured into the reactor, stir at a high speed for 15 minutes until the powder is completely dissolved. Then slowly add mixture A and stir for 10 minutes. Then let it stand for 1 hour and seal it to obtain a concrete retarder.

[0052] This example also provides an application of the concrete retarder. Stir the above-prepared concrete retarder and spray it onto the mold of a certain railway noise reduction and sound insulation wall. The spraying thickness is 0.2 mm. After the retarder dries for 60 minutes, pour the concrete. The composition of this concrete follows the general composition of the concrete for sound insulation walls without special regulations. The concrete cures in the mold for 10 h, and then the concrete is demolded to obtain a concrete sound insulation wall. After 72 hours, use a high-pressure water gun to wash it. After 3 months, compared with the same railway noise reduction and sound insulation wall, the depth of the slurry layer on the surface of the treated railway noise reduction and sound insulation wall reaches 7 mm, showing the rough texture inside the concrete, which is very close to the pickling effect.

[0053] Example 4

[0054] This example provides a concrete retarder, which includes the following components in parts by weight: 23 parts of petroleum hydrotreated light naphtha, 2 parts of silica, 2 parts of tartaric acid, 17 parts of titanium dioxide, 43 parts of borax, 9 parts of citric acid, and 4 parts of petroleum spirit.

[0055] The preparation method of this concrete retarder includes the following steps:

[0056] S1: Prepare materials according to the above components in parts by weight: among them, 23 kg of petroleum hydrotreated light naphtha, 2 kg of silica, 2 kg of tartaric acid, 17 kg of titanium dioxide, 43 kg of borax, 9 kg of citric acid, and 4 kg of petroleum spirit.

[0057] S2: Weigh 15.33 kg of petroleum hydrotreated light naphtha and place it in a reactor. Stir, slowly add 2 kg of soluble tartaric acid powder and 9 kg of citric acid powder, stir for 10 minutes, slowly add 4 kg of petroleum spirit, and continue to stir for 10 minutes to form mixture A.

[0058] Step 2: Weigh 7.67 kg of petroleum hydrotreated light naphtha and place it in a reactor. After stirring, slowly add 2 kg of powdered silica, 17 kg of titanium dioxide, and 43 kg of borax. Pour the powder while stirring at a low speed. After the powder is completely poured into the reactor, stir at a high speed for 15 minutes until the powder is completely dissolved. Then slowly add mixture A and stir for 10 minutes. Then let it stand for 1 hour and seal it to obtain a concrete retarder.

[0059] This embodiment also provides an application of a concrete retarder. The prepared concrete retarder is stirred and sprayed onto the surface of the mold of a certain cast-in-place concrete wall with a spraying thickness of 0.4 mm. After the retarder is dried for 60 minutes, concrete pouring is carried out. The composition of this concrete is in accordance with that of a general concrete wall without special regulations. The concrete is cured in the mold for 10 h, and then the concrete is demolded to obtain a concrete wall. After 24 hours, it is dry-brushed and rinsed with a high-pressure water gun. After 28 days, the vertical concrete is observed. Compared with the same concrete wall, the depth of the slurry layer on the surface of the treated concrete wall reaches 3 mm, presenting the texture of the aggregate inside the concrete and being full of beauty.

[0060] The concrete retarder of the present invention includes multiple components, and each component has its function. Among them, silica, as an inert filler, can cover the surface of cement particles to form a thin film, and this thin film plays a barrier role in the hydration of cement particles, capable of delaying the hydration rate of cement; this delaying effect helps to control the setting time of cement, enabling the freshly mixed concrete to maintain plasticity for a longer time, which is convenient for pouring and construction.

[0061] Citric acid and tartaric acid are organic acids. They can form unstable complexes (such as insoluble calcium salts) with calcium ions (Ca 2+ )in the cement through their carboxyl groups. In the initial stage of hydration, the formation of this complex controls the concentration of calcium ions in the liquid phase, thereby slowing down the hydration reaction rate of cement. Since calcium ions are key ions in the cement hydration process, the decrease in their concentration directly leads to the delay of the hydration reaction, and thus the effect of setting retardation is achieved; the functional groups such as hydroxyl (-OH) and carboxyl (-COOH) in citric acid and tartaric acid molecules have strong activity. They can adsorb on the surface of cement particles to form an adsorption film. The existence of this adsorption film hinders the direct contact between cement particles and water, thereby delaying the hydration process of cement. At the same time, the adsorption effect also changes the properties of the surface of cement particles, reducing their hydrophilicity and further slowing down the hydration rate; citric acid and tartaric acid may also inhibit the formation of calcium hydroxide (Ca(OH) 2 )in the cement. Calcium hydroxide is an important product in the cement hydration process, and its generation amount directly affects the hydration reaction of cement. Tartaric acid reduces the generation amount of calcium hydroxide by forming a complex with calcium ions, thereby prolonging the setting time of cement.

[0062] Titanium dioxide in titanium white powder can react with calcium ions in cement to form a dense protective film. This protective film covers the surface of cement particles, hindering the direct contact between cement and water, thereby delaying the hydration rate of cement. Titanium white powder particles may have a certain adsorption property and can adsorb on the surface of cement particles or the new phase of hydration products. The existence of the adsorption layer weakens the interaction force between cement particles, delaying the formation of the cement paste structure. The addition of titanium white powder also affects the formation and morphology of cement hydration products, changing the crystallization rate, crystal grain size or crystal phase composition of hydration products, and thus affecting the setting time and strength development of cement.

[0063] Borax mainly delays the hydration rate of cement by forming a poorly soluble thin film on the surface of cement particles to play a barrier role. Borate molecules in borax can form complexes with metal cations (mainly calcium ions) in the solution, and these complexes wrap around the surface of cement particles to form an amorphous barrier layer. This barrier layer prevents the direct contact between cement particles and water, slowing down the hydration rate of cement, thus achieving the effect of retarding setting.

[0064] Comparative Example 1

[0065] The difference between this comparative example and Example 1 is that the retarder does not include petroleum hydrotreated light naphtha. This comparative example of concrete retarder includes a composite retarder, a densifier, a pigment and a solvent. Among them, the composite retarder includes 4 parts of tartaric acid, 40 parts of borax and 12 parts of citric acid; the densifier includes 4.5 parts of silica; the pigment includes 18 parts of titanium white powder; the solvent includes 21.5 parts of petroleum spirit.

[0066] Comparative Example 2

[0067] The difference between this comparative example and Example 1 is that the retarder does not include petroleum spirit. This comparative example of concrete retarder includes a composite retarder, a densifier, a pigment and a solvent. Among them, the composite retarder includes 4 parts of tartaric acid, 40 parts of borax and 12 parts of citric acid; the densifier includes 4.5 parts of silica; the pigment includes 18 parts of titanium white powder; the solvent includes 21.5 parts of petroleum hydrotreated light naphtha.

[0068] Comparative Example 3

[0069] The difference between this comparative example and Example 1 is that the retarder does not include petroleum hydrotreated light naphtha and petroleum spirit. This comparative example of concrete retarder includes a composite retarder, a densifier, a pigment and a solvent. Among them, the composite retarder includes 4 parts of tartaric acid, 40 parts of borax and 12 parts of citric acid; the densifier includes 4.5 parts of silica; the pigment includes 18 parts of titanium white powder; the solvent includes 21.5 parts of hydroxypropyl methylcellulose.

[0070] Test Example

[0071] Appearance tests were conducted on Example 1 and Comparative Examples 1-3. The specific test method was as follows: The architectural facade decorative concrete prepared in Example 1 and Comparative Examples 1-3 was placed in a closed environment with a humidity of 80% and a temperature of 50 °C. After 10 days, it was taken out and its appearance was observed.

[0072]

[0073] As mentioned above, it is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or equivalent changes by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A concrete retarder, characterized in that: The retarder comprises the following components in parts by weight: 44-59 parts of a composite retarder, 2-4.5 parts of a densifier, 17-22 parts of a pigment and 21-32 parts of a solvent; the solvent comprises petroleum hydrogenated light naphtha and petroleum spirit, and the weight ratio of the petroleum hydrogenated light naphtha to the petroleum spirit is (20-28):(1-4); the composite retarder comprises tartaric acid, borax and citric acid; the weight ratio of the tartaric acid, borax and citric acid is (2-4):(33-43):(9-12).

2. A concrete retarder according to claim 1, characterized in that: The densifying agent includes one or both of silicon dioxide and aluminum oxide.

3. A concrete retarder according to claim 1, characterized in that: The pigment includes one or more of iron oxide red, iron oxide yellow, iron oxide brown, iron oxide black, chromium oxide green and titanium dioxide.

4. A method for preparing a concrete retarder according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Prepare the following components by weight: 20-28 parts of hydrogenated petroleum light naphtha, 2-4.5 parts of silicon dioxide, 2-4 parts of tartaric acid, 17-22 parts of titanium dioxide, 33-43 parts of borax, 9-12 parts of citric acid, and 1-4 parts of petroleum spirit; S2, weighing two-thirds of petroleum hydrogenated light naphtha and placing it in a reactor, adding tartaric acid and citric acid during stirring, mixing evenly, and then adding petroleum spirit, and mixing thoroughly to obtain a mixture A; S3, weighing the remaining one third by weight of petroleum hydrogenated light naphtha and placing it in a reactor, adding silicon dioxide, titanium dioxide and borax during stirring, mixing evenly, adding the mixture A obtained in step S2, mixing well, and then standing for 0.5-1.5 h and sealing to obtain a concrete retarder.

5. The use of a concrete retarder as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S11, stirring the concrete retarder and applying it on the mold surface; S12, after the concrete retarder is dried, pouring concrete into the mold to obtain a concrete component; S13. Flush the concrete components after 15-72 hours.

6. The use of a concrete retarder according to claim 5, characterized in that: In step S12, the concrete is cured in the mold for more than 8 hours, and then the concrete is demolded.

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