Concrete retarder as well as preparation method and application thereof

Abstract

The invention relates to a concrete retarder and a preparation method and application thereof, the retarder comprises the following components in parts by weight: 44-59 parts of a composite retarder, 2-4.5 parts of a compacting agent, 17-22 parts of a pigment and 21-32 parts of a solvent, and the composite retarder comprises 2-4 parts of tartaric acid, 33-43 parts of borax and 9-12 parts of citric acid; the compacting agent comprises 2-4.5 parts of silicon dioxide; the pigment comprises 17-22 parts of titanium dioxide; the solvent is prepared from 20 to 28 parts of petroleum hydrogenated light naphtha and 1 to 4 parts of petroleum essence. The petroleum hydrogenated light naphtha and the petroleum essence are used as solvents, dissolution of all the components is promoted, the stability and uniformity of the retarder are enhanced, the coagulation time can be regulated and controlled, coagulation of the retarder is promoted, and the viscosity of the retarder is adjusted by changing the mixing amount of the petroleum hydrogenated light naphtha and the petroleum essence; the concrete retarder is small in dosage, high in drying speed and uniform in flushing effect, 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 in particular to a concrete retarder and a preparation method and application thereof. Background Art

[0002] With the development of my country's national economy, people's needs for a better life are growing, and the aesthetic demand for modern architecture is getting higher and higher. Many buildings have the demand for carving patterns and drawing beautiful images on the surface, which enriches people's daily life. This is generally done with decorative stones. As a large and widely used building material, concrete plays a huge role in modern construction projects. Usually, concrete is composed of granular coarse aggregate, fine aggregate and cement hydrate. During the pouring and construction process, it is difficult to carve exquisite patterns on the concrete surface due to the difficulty of construction and high brittleness of concrete. Therefore, it is difficult for concrete to meet the needs of modern building surface aesthetic functions. In recent years, some exposed aggregate concrete retarders have appeared on the market. By spraying retarders on the surface of concrete to delay the condensation of the surface of the concrete structure, a unique concrete finish exposed aggregate effect is formed after treatment to improve the appearance of the concrete surface.

[0003] After searching the prior art, it was found that Chinese patent CN110510913A records a method for preparing a concrete surface bone-revealing agent for prefabricated components, which firstly prepares a polymer / layered silicate composite colloidal solution with silicate clay as the main component, and adds an organic-inorganic composite retarder composition to the polymer / layered silicate composite colloidal solution. Under the action of high-speed dispersion, functional additives, pigments, fillers and slow-release long-acting preservatives are sequentially added to the organic-inorganic composite retarder solution, and mixed and dispersed uniformly to form a concrete surface bone-revealing agent. However, the patent adds a large amount of clay, industrial by-product gypsum and other insoluble components, and the finished product is prone to precipitation and stratification, which brings great inconvenience to use.

[0004] Chinese patent CN103922796A records an environmentally friendly, low-cost concrete stone-exposing agent and construction process. The components and weight proportions of the concrete stone-exposing agent are as follows: water, 100 parts; monosaccharides, 7-15 parts; polysaccharides, 5-20 parts, wherein monosaccharides are preferably glucose or fructose, and polysaccharides are preferably white sugar or brown sugar. Compared with similar products, this invention patent reduces the cost by 90% while achieving the same use effect, greatly saving the project cost. However, the 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 stone-exposing agent, affecting its use and producing odor. In addition, the patent is applied to outdoor scenes and may be affected by other environmental factors, such as temperature, humidity, insects, dust and other pollution, which may accelerate the deterioration 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 a preparation method and application thereof.

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

[0007] Preferably, the composite retarder comprises tartaric acid, borax and citric acid.

[0008] Preferably, the weight ratio of tartaric acid, borax and citric acid is (2-4):(33-43):(9-12).

[0009] Preferably, the densifying agent includes one or both of silicon dioxide and aluminum oxide.

[0010] 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.

[0011] The choice of pigment in the present invention can be determined according to the exposed aggregate effect of the concrete surface, and is not limited to the above-mentioned ones.

[0012] Preferably, the solvent includes petroleum hydrogenated light naphtha and petroleum spirit.

[0013] Preferably, the weight ratio of the petroleum hydrogenated light naphtha to petroleum spirit is (20-28):(1-4).

[0014] Petroleum hydrogenated light naphtha as a diluent can effectively reduce the viscosity of the retarder, making the retarder easier to apply and evenly distributed during the construction process, which is crucial to improving the construction efficiency of the retarder and the quality of the coating; petroleum hydrogenated light naphtha can help the retarder to coagulate quickly after construction, which can not only shorten the coagulation time of the retarder and improve the construction efficiency, but also avoid quality problems such as peeling and bubbling on the surface of the retarder; petroleum hydrogenated light naphtha can be used as a co-solvent to help the ingredients in the retarder to mix better, thereby enhancing the stability and uniformity of the retarder, and can improve the durability and use effect of the retarder.

[0015] Petroleum spirit is a colorless, transparent liquid with good solubility. It can dissolve and dilute organic matter. As a solvent, it helps dissolve and disperse solid particles such as silicon dioxide, tartaric acid, titanium dioxide, borax and citric acid to form a uniform retarder system, which makes it easier to apply and distribute the retarder during construction, improving the construction efficiency of the retarder. Petroleum spirit has a low boiling point and volatility, which allows the retarder to condense quickly after construction. The volatility of the property helps the coating surface to solidify quickly, shortens the condensation time of the retarder, and improves production efficiency. Petroleum spirit can penetrate into the wall. This effect helps to improve the durability of the coating and the use effect, so that the retarder can 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 accurately controlled. This feature enables the retarder to adapt to different construction environments and needs. For example, in situations where a higher viscosity is required to form a thick coating, this can be achieved by reducing the amount of petroleum spirit used; and in situations where a lower viscosity is required for easy application, the purpose can be achieved by increasing the amount of petroleum spirit used.

[0016] The present invention also provides a method for preparing a concrete retarder, comprising the following steps: 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. Weigh the remaining one third by weight of petroleum hydrogenated light naphtha and place it in a reactor. Add silicon dioxide, titanium dioxide and borax during stirring. After mixing evenly, add the mixture A obtained in step S2 and mix well. Then, let it stand for 1 hour and seal it to obtain a concrete retarder.

[0017] The present invention also provides an application of a concrete retarder, comprising the following steps: 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.

[0018] Preferably, in step S12, the concrete is cured in the mold for more than 8 hours before demolding the concrete.

[0019] The concrete retarder of the present invention realizes the function of surface retarding for early concrete; after the concrete component solidifies for 18 to 72 hours, the concrete on the part where the retarder is not applied solidifies, and at this time, the concrete component is washed to wash away the retarder and the unsolidified concrete, thereby forming a desired pattern on the concrete surface and having anti-slip performance.

[0020] A concrete retarder and its preparation method and application of the present invention have the following advantages: 1. The use of petroleum hydrogenated light naphtha and petroleum spirit as solvents can promote the dissolution of various components and enhance the stability and uniformity of the retarder; changing the dosage of petroleum hydrogenated light naphtha and petroleum spirit can regulate the setting time of the retarder and promote the setting of the retarder. At the same time, petroleum hydrogenated light naphtha and petroleum spirit have good volatility and can adjust the viscosity of the retarder.

[0021] 2. The concrete retarder of the present invention can be sprayed, with a small amount and fast drying speed, and can form a desired pattern on the concrete surface. In the subsequent flushing process, the flushing effect is uniform, 13 different flushing depths can be achieved, the cleaning time span is long, and the cleaning cost is low. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the preferred embodiments.

[0023] Example 1 This embodiment provides a concrete retarder, including a composite retarder, a densifier, a pigment and a solvent.

[0024] 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; and the solvent includes 20 parts of petroleum hydrogenated light naphtha and 1.5 parts of petroleum spirit.

[0025] The preparation method of the concrete retarder comprises the following steps: S1. Prepare the materials according to the above components in parts by weight: 20 kg of petroleum hydrogenated 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.

[0026] S2. Weigh 13.33 kg of petroleum hydrogenated light naphtha and place it in a reactor. Stir. Slowly add 4 kg of soluble tartaric acid powder and 12 kg of citric acid powder. Stir for 10 minutes. Slowly add 1.5 kg of petroleum spirit. Continue stirring for 10 minutes to form a mixture A.

[0027] S3. Weigh 6.67 kg of petroleum hydrogenated light naphtha and place it in a reactor. After stirring, slowly add 4.5 kg of powdered silicon dioxide, 18 kg of titanium dioxide and 40 kg of borax, and 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 to seal, and obtain a concrete retarder.

[0028] This embodiment also provides an application of a concrete retarder, wherein the prepared concrete retarder is stirred and sprayed on a mold of a cast-in-place building facade decorative concrete. After the retarder is dried for 60 minutes, concrete is poured, and the concrete is cured in the mold for 8 hours, and the concrete is demolded to obtain the building facade decorative concrete. After 15 hours, the building facade decorative concrete is dry-brushed and then cleaned. After 28 days, the building facade decorative concrete is observed. Compared with the same facade concrete, the depth of the slurry layer on the surface of the building facade decorative concrete treated in this embodiment reaches 0.1 mm, and the concrete facade presents a delicate sandstone effect, showing the aggregate texture inside the concrete, which is beautiful.

[0029] Example 2 The present embodiment provides a concrete retarder, which comprises the following components in parts by weight: 28 parts of petroleum hydrogenated light naphtha, 3 parts of silicon dioxide, 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.

[0030] The preparation method of the concrete retarder comprises the following steps: S1. Prepare the materials according to the above components in parts by weight: 28kg of petroleum hydrogenated light naphtha, 3kg of silicon dioxide, 3kg of tartaric acid, 22kg of titanium dioxide, 33kg of borax, 10kg of citric acid, and 1kg of petroleum spirit.

[0031] S2. Weigh 18.67 kg of petroleum hydrogenated 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. Continue stirring for 10 minutes to form a mixture A.

[0032] Step 2: Weigh 9.33 kg of petroleum hydrogenated light naphtha and place it in a reactor. After stirring, slowly add 3 kg of powdered silicon dioxide, 22 kg of titanium dioxide and 33 kg of borax. Pour the powder into the reactor 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 to seal it to obtain a concrete retarder.

[0033] This embodiment also provides an application of a concrete retarder. The prepared concrete retarder is stirred and sprayed on a mold of a precast concrete plate with a spraying thickness of 0.3 mm. After the retarder dries for 20 minutes, concrete is poured. The composition of this concrete is set according to the composition of a general concrete plate. For example, this concrete includes 75 parts of ordinary Portland cement, 200 parts of coarse aggregate stone, 150 parts of fine aggregate sand, 30 parts of admixture fly ash, 5 parts of water reducer and 40 parts of water according to mass fraction. The concrete is cured in the mold for 10 hours, and the concrete is demolded to obtain a concrete plate. After 18 hours, it is rinsed with a high-pressure water gun. After 28 days of curing, compared with the same precast concrete plate, the depth of the slurry layer on the surface of the precast concrete plate treated in this embodiment reaches 2 mm, showing the aggregate texture inside the concrete.

[0034] Example 3 The present embodiment provides a concrete retarder, which comprises the following components in parts by weight: 25 parts of petroleum hydrogenated light naphtha, 2.5 parts of silicon dioxide, 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.

[0035] The preparation method of the concrete retarder comprises the following steps: S1. Prepare the materials according to the above components in parts by weight: 25 kg of petroleum hydrogenated light naphtha, 2.5 kg of silicon dioxide, 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.

[0036] S2. Weigh 16.67 kg of petroleum hydrogenated 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. Continue stirring for 10 minutes to form a mixture A.

[0037] Step 2: Weigh 8.33 kg of petroleum hydrogenated light naphtha and place it in a reactor. After stirring, slowly add 2.5 kg of powdered silicon dioxide, 20 kg of titanium dioxide and 37 kg of borax. Pour the powder into the reactor 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 to seal it to obtain a concrete retarder.

[0038] This embodiment also provides an application of a concrete retarder. The prepared concrete retarder is stirred and sprayed onto a mold of a railway noise reduction and sound insulation wall. The spraying thickness is 0.2 mm. After the retarder is dried for 60 minutes, concrete is poured. The composition of this concrete is in accordance with the concrete composition of a general sound insulation wall. There are no special regulations. The concrete is cured in the mold for 10 hours, and the concrete is demolded to obtain a concrete sound insulation wall. After 72 hours, it is rinsed with a high-pressure water gun. 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 7mm, showing the rough texture inside the concrete, which is very close to the acid washing effect.

[0039] Example 4 The present embodiment provides a concrete retarder, which comprises the following components in parts by weight: 23 parts of petroleum hydrogenated light naphtha, 2 parts of silicon dioxide, 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.

[0040] The preparation method of the concrete retarder comprises the following steps: S1. Prepare the materials according to the above components in parts by weight: 23kg of petroleum hydrogenated light naphtha, 2kg of silicon dioxide, 2kg of tartaric acid, 17kg of titanium dioxide, 43kg of borax, 9kg of citric acid, and 4kg of petroleum spirit.

[0041] S2. Weigh 15.33 kg of petroleum hydrogenated 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. Continue stirring for 10 minutes to form a mixture A.

[0042] Step 2: Weigh 7.67 kg of petroleum hydrogenated light naphtha and place it in a reactor. After stirring, slowly add 2 kg of powdered silicon dioxide, 17 kg of titanium dioxide and 43 kg of borax. Pour the powder into the reactor 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 to seal it to obtain a concrete retarder.

[0043] This embodiment also provides an application of a concrete retarder. The prepared concrete retarder is stirred and sprayed onto the mold surface of a cast-in-place concrete wall. The spraying thickness is 0.4 mm. After the retarder is dried for 60 minutes, concrete pouring is performed. The composition of this concrete is in accordance with the composition of a general concrete wall without special provisions. The concrete is cured in the mold for 10 hours, and the concrete is demolded to obtain a concrete wall. After 24 hours, dry brushing is performed and rinsed with a high-pressure water gun. After 28 days, the facade 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, showing the aggregate texture inside the concrete, which is beautiful.

[0044] The concrete retarder of the present invention comprises a plurality of components, each of which has its own function. Silicon dioxide, as an inert filler, can cover the surface of cement particles to form a thin film, which acts as a barrier to the hydration of cement particles and can slow down the hydration rate of cement. This slowing effect helps to control the setting time of cement, so that the newly mixed concrete can maintain plasticity for a long time, which is convenient for pouring and construction.

[0045] Citric acid and tartaric acid are organic acids that can react with calcium ions (Ca 2+ ) forms unstable complexes (such as insoluble calcium salts). In the early stage of hydration, the formation of this complex controls the concentration of calcium ions in the liquid phase, thereby slowing down the hydration reaction of cement. Since calcium ions are the key ions in the cement hydration process, the reduction in their concentration directly leads to the delay of the hydration reaction, thereby achieving the effect of retarding setting; the functional groups such as hydroxyl (-OH) and carboxyl (-COOH) in citric acid and tartaric acid molecules are highly active. 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 cement. Calcium hydroxide is an important product in the cement hydration process, and its generation directly affects the hydration reaction of cement. Tartaric acid reduces the generation of calcium hydroxide by forming complexes with calcium ions, thereby prolonging the setting time of cement.

[0046] The titanium dioxide in titanium dioxide can react with the 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 slowing down the hydration rate of cement. Titanium dioxide particles may have certain adsorption properties and can be adsorbed on the surface of cement particles or new phases of hydration products. The existence of the adsorption layer weakens the interaction force between cement particles and delays the formation of cement paste structure. The addition of titanium dioxide also affects the generation and morphology of cement hydration products, changes the crystallization rate, grain size or crystal phase composition of hydration products, and thus affects the setting time and strength development of cement.

[0047] Borax acts as a barrier by forming an insoluble film on the surface of cement particles, thereby slowing down the hydration rate of cement. The borate molecules in borax can form complexes with metal cations (mainly calcium ions) in the solution. These complexes are wrapped on the surface of cement particles to form an amorphous barrier layer. This barrier layer prevents direct contact between cement particles and water, slowing down the hydration rate of cement, thereby achieving a slow-setting effect.

[0048] Comparative Example 1 The difference between this comparative example and Example 1 is that the retarder does not include petroleum hydrogenated light naphtha, and the concrete retarder of this comparative example includes a composite retarder, a densifier, a pigment and a solvent; wherein 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; and the solvent includes 21.5 parts of petroleum spirit.

[0049] Comparative Example 2 The difference between this comparative example and Example 1 is that the retarder does not include petroleum spirit, and the concrete retarder of this comparative example includes a composite retarder, a densifier, a pigment and a solvent; wherein 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; and the solvent includes 21.5 parts of petroleum hydrogenated light naphtha.

[0050] Comparative Example 3 The difference between this comparative example and Example 1 is that the retarder does not include petroleum hydrogenated light naphtha and petroleum spirit, and the concrete retarder of this comparative example includes a composite retarder, a densifier, a pigment and a solvent; wherein 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; and the solvent includes 21.5 parts of hydroxypropyl methylcellulose.

[0051] Test example The appearance test was performed on Example 1 and Comparative Examples 1-3. The specific test method is: the building 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., and was taken out after 10 days to observe its appearance.

[0052]

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still 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.

2. A concrete retarder according to claim 1, characterized in that: Composite retarders include tartaric acid, borax and citric acid.

3. A concrete retarder according to claim 2, characterized in that: The weight ratio of tartaric acid, borax and citric acid is (2-4):(33-43):(9-12).

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

5. 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.

6. A concrete retarder according to claim 1, characterized in that: The weight ratio of petroleum hydrogenated light naphtha and petroleum spirit is (20-28):(1-4).

7. A method for preparing a concrete retarder according to any one of claims 1 to 6, 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.

8. The use of a concrete retarder according to any one of claims 1 to 6, 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.

9. The use of a concrete retarder according to claim 8, 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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