JP7306229B2 - Patterning process paper for precast concrete - Google Patents

Description

TECHNICAL FIELD The present invention relates to a patterning process paper for precast concrete, and more particularly to a patterning process paper for precast concrete, which is capable of developing a pattern on the concrete surface by means of a concrete retarder.

Conventionally, there is a method called precast concrete, which is a method in which building structures and components are produced in advance in a factory or the like and then assembled on site. Securing stable quality, shortening construction periods, saving labor, and reducing noise. It is possible to solve problems such as reduction of environmental load.

In addition, by using a patterning process paper for precast concrete, by partially delaying the hardening of the concrete by the effect of the hardening retardant formed in a pattern on the process paper, the surface of the concrete and the aggregate The exposed surface is formed, and this contrast is used to express a pattern design on the concrete surface.

Patent Document 1 proposes such a patterning process paper for precast concrete. In this case, since the concrete surface that is left to be cast becomes dirty over time, as a countermeasure, painting or water-repellent finishing is generally performed as a final finish.

However, when using such a patterning process paper for precast concrete, the patterning is performed by the contrast between the surface that is left on the surface of the concrete and the surface where the aggregate is exposed, so that the entire surface is painted. , or water-repellent finish may impair the desired design.

JP 2018-89930 A

The present invention has been made in view of such circumstances. A patterning process paper for precast concrete that can be patterned by contrast does not require painting or a water-repellent finish on the finished concrete surface, so that the effect of patterning is not impaired and the aged concrete surface is not stained. An object of the present invention is to provide a patterning process paper for precast concrete, which can prevent patterning.

As a means for solving the above problems, the invention according to claim 1,
A patterning process paper for precast concrete, comprising a concrete retarder layer provided in an arbitrary pattern on a base sheet,
A photocatalyst layer is provided on a portion of the base sheet other than the portion provided with the concrete retarder layer,
The composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin. The aqueous resin is a single substance or a mixture of polyvinyl alcohol, urethane resin, and polyethylene oxide resin. It is a patterning process paper for precast concrete, characterized in that it is a range.

In addition, the invention according to claim 2,
2. The patterning process paper for precast concrete according to claim 1, wherein the base sheet is made of plastic film or synthetic paper.

In addition, the invention according to claim 3,
3. The patterning paper for precast concrete according to claim 1, wherein the photocatalyst is titanium dioxide.

Further, the invention according to claim 4,
The above-mentioned concrete curing retarder is blended at a ratio of 10 to 60% oxycarboxylic acid, 35 to 80% rosin resin, and 5 to 10% titanium oxide, and the coating thickness is 5 to 80 μm. The patterning process paper for precast concrete according to any one of claims 1 to 3, characterized by:

According to the present invention, patterning for precast concrete can be achieved by using a hardening retardant provided in a desired shape on the casting paper, and patterning can be achieved by the contrast between the surface of the concrete surface that is left unpunched and the surface of the exposed aggregate. A patterning for precast concrete that does not require painting or a water-repellent finish on the finished concrete surface of the casting paper, thus not impairing the effect of the patterning, and that is capable of preventing contamination of the exposed concrete surface over time. It is possible to provide process paper.

In particular, according to the second aspect of the invention, the casting paper can have water resistance against water contained in concrete before hardening. Therefore, it enables patterning on the concrete surface to be performed more stably.

According to the third aspect of the invention, by using titanium dioxide as a photocatalyst, the anti-pollution effect of the photocatalyst can be produced more efficiently and stably, and the cost is relatively low. In addition, it is possible to obtain a patterning process paper for precast concrete.

In addition, by using titanium dioxide as a photocatalyst, in addition to the anti-pollution effect, effects such as air purification, deodorization, water purification, and antibacterial effects are also possible.

In particular, according to the fourth aspect of the invention, the concrete curing retarder is blended at a ratio of 10 to 60% oxycarboxylic acid, 35 to 80% rosin resin, and 5 to 10% titanium oxide. A coating thickness of 5 to 80 μm makes it possible to retard the hardening of concrete more stably, which is effective in improving the design of patterning of the concrete surface by washing out.

FIG. 1 is a schematic partial cross-sectional view for explaining one embodiment of the patterning process paper for precast concrete according to the present invention. FIG. 2 is a schematic partial cross-sectional view for explaining a concrete surface patterned by one embodiment of the patterning process paper for precast concrete according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 and 2. FIG. However, the invention is not limited to the examples shown here. The invention is limited by the claims.

FIG. 1 is a schematic partial cross-sectional view for explaining one embodiment of the patterning process paper for precast concrete according to the present invention.

The present invention is a patterning process paper (10) for precast concrete, comprising a substrate sheet (1) and a concrete retarder layer (3) provided in an arbitrary pattern.

The process paper referred to here refers to paper, synthetic paper, plastic film, and sheet that can form the shape of the concrete surface and add functions when the concrete hardens, and the patterning process is completed. After that, it is peeled off and becomes unnecessary.

A photocatalyst layer (2) is provided on the portion of the base sheet (1) other than the portion on which the concrete retarder layer (3) is provided.

Regarding this, in the process of earnestly studying the present invention, we found that the composition of the photocatalyst layer (2) is 5 to 60% photocatalyst and 40 to 95% aqueous resin, and the aqueous resin is polyvinyl alcohol, urethane resin, polyethylene. It was found that an oxide resin alone or a mixture with a film thickness in the range of 8 to 150 μm is optimum for the photocatalyst layer.

FIG. 2 is a schematic partial cross-sectional view for explaining a concrete surface patterned by one embodiment of the patterning process paper for precast concrete according to the present invention.

The function of the patterning process paper for precast concrete (10) according to the present invention to form a specific shape is that the concrete retarder layer (3) provided in any pattern on the base sheet (1) It is due to

In the example shown in FIG. 2, the surface of the precast concrete (20) has a recessed portion (21) where the aggregate is exposed, and the flat surface of the exposed concrete portion has A photocatalyst (22) is layered.

In the process of hardening the concrete, an unhardened portion is created on the surface, and after the other portions of the concrete have hardened, the unhardened portion is washed away to expose the aggregate and form a rough surface, It can be made into the surface shape with a dent.

In the process of earnestly studying the present invention, we found that the concrete retarder was formulated at a ratio of 10 to 60% oxycarboxylic acid, 35 to 80% rosin resin, and 5 to 10% titanium oxide. It was found that a coating thickness of 5 to 80 μm is optimal for patterning concrete surfaces.

By forming the concrete setting retarder layer with the ratio and thickness within this range, it becomes possible to more effectively retard the hardening of the concrete surface during hardening.

The patterning process using this patterning process paper for precast concrete (10) can be carried out, for example, as follows.

- The patterning process paper for precast concrete (10) is laid under the concrete mold or attached to the sides of the mold with double-sided tape.
・Pour fresh concrete into the concrete formwork.
・Cure for about a day until the concrete hardens.
・Remove the concrete from the formwork.
- At this time, the patterning process paper for precast concrete (10) is peeled off.
- The surface or side of the concrete is washed with water to expose the aggregate and form a pattern by washing away the unhardened portion of the concrete.

This precast concrete has many advantages at construction sites because it is molded in advance at another location such as a factory using, for example, a steel formwork, compared to the method of forming concrete by providing a formwork on site. The patterning process paper for precast concrete according to the present invention can be used in the curing and molding process of precast concrete.

Since the exposed aggregate portion has a rough surface and recesses compared to other portions, it is possible to form an arbitrary pattern on the surface of the concrete. Although the method of providing the concrete retarder layer on the base sheet is not particularly limited, for example, a known printing method can be used.

On the other hand, in the present invention, the functionalization by the patterning process paper for precast concrete (10) is performed by transferring the photocatalyst layer provided on the substrate sheet to the concrete surface.

In other words, the photocatalyst layer is provided on the portion other than the portion provided with the concrete retarder layer, and the photocatalyst-based antifouling function is imparted to the concrete surface by transferring the photocatalyst layer to the concrete surface. .

In addition to the antifouling function, photocatalyst functions include, for example, antibacterial function, water purification function, deodorizing function, and air purification function, and it is possible to impart these functions to the concrete surface as well.

In the present invention, the composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin, and the aqueous resin is polyvinyl alcohol, urethane resin, polyethylene oxide resin alone or a mixture, and the film thickness is in the range of 8-150 μm.

In the process of studying the present invention, we found that the composition of the photocatalyst layer within this range enables the layer to be transferred and formed on the concrete surface, and the antifouling function is exhibited more effectively. rice field.

In addition, titanium dioxide can be used as a photocatalyst, in which case the effect is remarkable. In particular, among titanium dioxides, those having an anatase-type crystal structure can be used.

This transfer can be performed in the step of patterning the surface of concrete using the patterning process paper for precast concrete (10) described above.

In addition, since the photocatalyst layer is provided in a part other than the concrete curing retarder layer, the exposed aggregate and dents do not appear in the concrete after hardening, and the flat surface is left as the concrete is left. It is formed.

This flat surface may become dirty over time, but the selective transfer of the photocatalyst layer to this portion is effective in preventing dirt over time due to the anti-fouling function, which is convenient.

In the present invention, a plastic film or synthetic paper can be used as the base sheet. In addition to a single plastic film, it is also possible to use laminated paper in which plastic films are laminated on both sides of paper.

The plastic film is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), Polyimide or the like can be used and can be selected as appropriate.

For example, plastic films made of polypropylene or polyethylene terephthalate are preferable in terms of film strength and cost.

As described above, the patterning process paper for precast concrete (10) according to the present invention can be obtained by the contrast between the surface of the concrete surface and the surface where the aggregate is exposed, due to the setting retarder provided in an arbitrary shape. The patternable precast concrete patterning paper (10) does not require a paint or water repellent finish on the finished concrete surface.

Therefore, it is possible to provide a patterning process paper (10) for precast concrete which does not impair the effect of patterning and which can prevent contamination of the concrete-poured surface over time.

The present invention will be described in more detail with reference to Examples 1 to 13 and Comparative Examples 1 to 7 below. However, the invention is not limited to the examples shown here. The invention is limited by the claims.

Samples of patterning process paper for precast concrete were prepared as Examples 1 to 13 and Comparative Examples 1 to 7 and evaluated.

Its basic configuration is as follows.
1. Base sheet:
Polylaminated paper (thickness: 250 μm) laminated with polyolefin resin on both sides was used.
2. Composition of coating solution for concrete retarder layer:
Main component oxycarboxylic acid 10-55%
Resin Rosin resin 35-80%
Others Titanium oxide 5-10%
3. Film thickness of concrete retarder:
50 μm.
4. Method for forming concrete retarder layer and photocatalyst layer:
It was coated using a printing method.

Patterning of the concrete surface by pouring concrete was carried out according to the following procedure.

・Attach patterning process paper for precast concrete to concrete decorative formwork using adhesive tape.
・The material composition of the precast concrete was 25-40% coarse aggregate, 25-40% fine aggregate, and 10-30% Portland cement.
・Add 0.05 to 0.2 kg of water to 1 kg of this precast concrete mixture and stir.
・Pour the stirred concrete into the formwork and cure it at room temperature for 24 hours.
・Remove the concrete from the formwork. At this time, the process paper is peeled off.
• Scrub the surface of the concrete with a brush for 2 minutes while the concrete is submerged in water to remove unhardened areas.
・Dry the concrete at room temperature for 1 hour or longer, and visually observe the surface and evaluate the evaluation items.

Evaluation items, evaluation methods, and evaluation criteria are as follows.

Designability by Washing Out Concrete Designability by patterning was evaluated by visual observation from above under indoor white light.
Evaluation criteria is good design: 〇
Bad design: ×
and

Evaluation of the antifouling photocatalyst performance was carried out.
According to JIS R 1703-2.
The evaluation criteria are
Degradation activity index 10 or more ◎
Degradation activity index 5 or more and less than 10 〇 Degradation activity index 1 or more and less than 5 △
Degradation activity index less than 1 ×
and

Strength of photocatalyst printed part (evaluated in the state of patterning process paper for precast concrete)
According to JIS K 5600-5-6.
The evaluation criteria are
Only part of the photocatalyst is peeled off ◎
Photocatalyst peels off in most areas 〇 Photocatalyst peels off over entire surface ×
and

<Comprehensive evaluation>
If either the design property by washing out the concrete or the antifouling property was rated x, the comprehensive evaluation was rated x.
If there is a △ evaluation in either the designability by washing the concrete or the antifouling property, the overall evaluation is △. The overall evaluation was 〇 for items above 〇.
If two or more of the three items of designability by washing concrete, antifouling property, and strength of the photocatalyst-printed portion are evaluated as ⊚, the overall evaluation is ⊚.

In the comprehensive evaluation, those with 0 or higher were deemed practical and passed.

Table 1 shows the configurations of Examples 1 to 13 and Comparative Examples 1 to 7. Hereinafter, individual examples and comparative examples will be described with reference to Table 1.

<Example 1>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 5%
Resin (urethane resin) 95%
Film thickness of photocatalyst layer:
20 μm.

<Example 2>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 10%
Resin (urethane resin) 90%
Film thickness of photocatalyst layer:
20 μm.

<Example 3>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 20%
Resin (urethane resin) 80%
Film thickness of photocatalyst layer:
20 μm.

<Example 4>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
8 μm.

<Example 5>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
20 μm.

<Example 6>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
40 μm.

<Example 7>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
70 μm.

<Example 8>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
100 μm.

<Example 9>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
120 μm.

<Example 10>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
150 μm.

<Example 11>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 40%
Resin (urethane resin) 60%
Film thickness of photocatalyst layer:
20 μm.

<Example 12>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 50%
Resin (urethane resin) 50%
Film thickness of photocatalyst layer:
20 μm.

<Example 13>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 60%
Resin (urethane resin) 40%
Film thickness of photocatalyst layer:
20 μm.

<Comparative Example 1>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (acrylic resin) 70%
This part is the same as Example 5 except that an acrylic resin is used as the resin system.
The acrylic resin used in Comparative Example 1 is not included in the range defined by the present invention.

Film thickness of photocatalyst layer:
20 μm.

<Comparative Example 2>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
5 μm.
This portion is the same as in Example 4, except that the film thickness of the photocatalyst layer is 5 μm.
The film thickness of the photocatalyst layer defined in the present invention is 8 to 150 μm, and Comparative Example 2 deviates from this range.

<Comparative Example 3>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 30%
Resin (urethane resin) 70%
Film thickness of photocatalyst layer:
155 μm.
This part is the same as in Example 10, except that the film thickness of the photocatalyst layer is 155 μm.
The film thickness of the photocatalyst layer defined in the present invention is 8 to 150 μm, and Comparative Example 3 deviates from this range.

<Comparative Example 4>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 3%
Resin (urethane resin) 97%
This part is the same as in Example 1, except that the composition of the photocatalyst coating solution is 3% titanium dioxide (urethane resin) 97%.
In the present invention, the composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin, and Comparative Example 4 deviates from this range.

Film thickness of photocatalyst layer:
20 μm.

<Comparative Example 5>
A photocatalyst layer was formed by applying the following photocatalyst coating liquid to the entire portion of the patterning process paper for precast concrete other than the concrete retarder layer by a printing method.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 70%
Resin (urethane resin) 30%
This part is the same as in Example 13, except that the composition of the photocatalyst coating solution is 70% titanium dioxide (urethane resin) 30%.
In the present invention, the composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin, and Comparative Example 5 deviates from this range.

Film thickness of photocatalyst layer:
20 μm.

<Comparative Example 6>
The patterning process paper for precast concrete has a structure in which the photocatalyst layer is not provided on the portion other than the concrete retarder layer.
This portion deviates from the configuration defined in the present invention in Comparative Example 6.

<Comparative Example 7>
The patterning process paper for precast concrete was configured without a concrete hardening retarder layer.
This portion deviates from the configuration defined in the present invention in Comparative Example 7.
Other than that, it is the same as the fifth embodiment.

Composition of the photocatalyst coating solution:
Main component Titanium dioxide 70%
Resin (urethane resin) 30%
Film thickness of photocatalyst layer:
20 μm.

Table 2 shows the evaluation results.

From the evaluation results shown in Table 2 and the overall evaluation, the patterning process paper for precast concrete according to the present invention and the surface of the concrete panel patterned using the same were evaluated in Examples 1 to 13 as ◯ or ◎. As a result, all of Examples 1 to 13 are within the practical range and pass the test.

That is, the patterning process paper for precast concrete of Examples 1 to 13 was provided with a photocatalyst layer other than the portion provided with the concrete retarder layer,
The composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin. The aqueous resin is a single substance or a mixture of polyvinyl alcohol, urethane resin, and polyethylene oxide resin. in the range
It is thought that the photocatalyst was transferred to the concrete-poured part, and that all the evaluation items were good.

On the other hand, in Comparative Examples 1 to 7, in which the configuration deviates from the scope defined in the present invention, all of them are rated △ or less, and even in the overall evaluation, △ or × , which is a result that does not reach the pass.

A consideration of individual comparative examples is added below.

In Comparative Example 1, the composition of the photocatalyst coating liquid was not the urethane resin specified in the present invention, but an acrylic resin, so both the antifouling property and the strength of the photocatalyst printed portion were evaluated as x. became.

In Comparative Example 2, since the film thickness of the photocatalyst was less than the specified value (5 μm), although the strength of the photocatalyst-printed portion was evaluated as ⊚, the antifouling property was inferior and was evaluated as Δ.

In Comparative Example 3, since the film thickness of the photocatalyst exceeded the specified value (155 μm), the strength of the photocatalyst-printed portion was evaluated as ×, and the antifouling property was poor and evaluated as Δ.

In Comparative Example 4, the proportion of the photocatalyst in the coating solution of the photocatalyst was below the prescribed level, so the antifouling property was inferior and was evaluated as Δ.

In Comparative Example 5, the ratio of the photocatalyst in the coating liquid formulation of the photocatalyst exceeded the prescribed value, so the antifouling property was poor and was evaluated as Δ, and the strength of the photocatalyst-printed portion was evaluated as x.

In Comparative Example 6, since the photocatalyst layer defined in the present invention was not provided on the casting paper, the photocatalyst layer was not transferred and formed on the concrete surface, and therefore the antifouling property was evaluated as x.

In Comparative Example 7, since the casting paper was not provided with the concrete retarder layer defined in the present invention, the concrete surface was not patterned, and therefore, the evaluation of the design property by washing out the concrete was evaluated as x.

In this way, patterning process paper for precast concrete can be patterned by the contrast between the surface of the concrete surface and the surface where the aggregate is exposed by the setting retarder provided in an arbitrary shape on the process paper. In the above, a patterning process paper for precast concrete that does not require painting or water-repellent finishing on the finished concrete surface, therefore does not impair the effect of patterning, and can prevent contamination over time of the uncast concrete surface. We were able to verify that it is possible to provide

REFERENCE SIGNS LIST 1 Base sheet 2 Photocatalyst layer 3 Concrete retarder layer 10 Patterning process paper for precast concrete 20 Precast concrete 21 Aggregate exposed portion 22 photocatalyst

Claims (4)

A patterning process paper for precast concrete, comprising a concrete retarder layer provided in an arbitrary pattern on a base sheet,
A photocatalyst layer is provided on a portion of the base sheet other than the portion provided with the concrete retarder layer,
The composition of the photocatalyst layer is 5 to 60% photocatalyst and 40 to 95% aqueous resin. The aqueous resin is a single substance or a mixture of polyvinyl alcohol, urethane resin, and polyethylene oxide resin. A patterning process paper for precast concrete, characterized in that it is a range. 2. The patterning process paper for precast concrete according to claim 1, wherein the base sheet is made of plastic film or synthetic paper. 3. The patterning paper for precast concrete according to claim 1, wherein the photocatalyst is titanium dioxide. The above-mentioned concrete curing retarder is blended at a ratio of 10 to 60% oxycarboxylic acid, 35 to 80% rosin resin, and 5 to 10% titanium oxide, and the coating thickness is 5 to 80 μm. The patterning process paper for precast concrete according to any one of claims 1 to 3, characterized by:

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